JPH0848024A - Screen printing machine - Google Patents

Abstract

PURPOSE:To provide a screen printing agent in a closed space to almost perfectly use all of the received printing agent. CONSTITUTION:An extrusion plate 230 is fitted in the printing agent chamber 154 long in the lateral direction of a screen of a printing agent container 120 and allowed to fall by an extrusion air cylinder 222 to extrude creamy solder from the gap between a pair of squeegees 142. At the time of printing, a printing head 90 is moved in such a state that the squeegees 142 are in contact with the screen and the creamy solder is pressed by the extrusion plate 230 to fill the through-holes of a printing substrate and the excessive creamy solder is scraped off by the squeegees 142. At the time of replenishment, a push-in plate 168 is separated from a printing agent supply port 162 to place the creamy solder on a printing agent receiver 270 and the creamy solder is pushed in the printing agent chamber 154 by the push-in plate 168. The printing agent chamber is opened by revolving the member constituting the printing agent container to supply a printing agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine, and more particularly to an improvement of a printing agent filling device for filling a through hole of a screen with a printing agent.

[0002]

2. Description of the Related Art A screen printing machine uses a cream solder,
It is a device that prints a printing agent such as an adhesive on a material to be printed such as a printed circuit board through a through hole formed in a screen.
Therefore, a conventional screen printing machine has a squeegee device, and a squeegee moves on the screen to fill a printing agent in a concave portion formed by a through hole of the screen and a surface of a material to be printed, and then the screen and the object to be printed. When the printing material is separated from the printing material, the printing material filled in the recess is released from the through hole and left on the surface of the printing material to perform printing.

The screen printer described in Japanese Patent Laid-Open No. 4-284249 is an example. In this screen printing machine, the printing agent is contained in a closed container. A pair of squeegees are attached to the downward opening of the closed container so that the distance between the squeegees becomes wider toward the lower side to form a discharge port. An inert gas is supplied to the closed container, the printing agent in the closed container is supplied to the discharge port by the pressure of the inert gas and its own weight, and the printing agent is rubbed against the screen by the squeegee to fill the through hole. That is, since the wedge-shaped clearance formed between the squeegee and the screen adjacent to the discharge port is filled in the through hole of the screen by the pressure generated by the wedge action based on the relative movement of the squeegee and the screen. is there. The printing agent is rubbed onto the screen surface mainly by the squeegee, so that the through hole is filled with the pressure generated at the tip of the wedge-shaped gap. By thus containing the printing agent in the closed container and filling the closed container with an inert gas, it is possible to suppress the change in viscosity due to the oxidation of the printing agent or the evaporation of the solvent.

[0004]

However, the screen printing machine described in the above publication has a problem that the printing agent contained in the closed container cannot be used up. When the remaining amount of printing agent is high, the inert gas pushes the printing agent by pushing the printing agent out, but when the remaining amount of printing agent is low, the inert gas penetrates into the printing agent and becomes a gas. A situation occurs in which only the inert gas escapes from the discharge port without forming the passage and extruding the printing agent.

If the printing agent in the closed container cannot be used up, the printing agent must be terminated with the printing agent remaining in the closed container, and the printing agent remains in the closed container until the next printing is performed. Remains, resulting in problems such as an increase in viscosity of the printing agent and deterioration of the printing agent. In the screen printing machine described in the above publication, the float is floated on the printing agent in the closed container, but this float is for detecting the level of the printing agent, and the inner peripheral surface of the closed container. When there is a small amount of printing agent, it is inevitable that the inert gas will form a passage that penetrates through the printing agent.

A first object of the present invention is to provide a screen printing machine capable of almost completely using up the printing agent supplied to the closed space for printing on a printing material. A second aspect of the present invention has an object to provide a screen printing machine capable of accurately controlling the pressure for filling the through-hole of the screen with the printing agent. The third invention has been made to solve the problems of the first invention and to provide a screen printing machine capable of continuously printing on a large number of materials to be printed.

[0007]

According to the first aspect of the present invention, there is provided a screen printing machine comprising: (a) a squeegee extending in the width direction of the screen and a printing agent outflow prevention wall arranged opposite to the squeegee. A printing agent container having a printing agent ejection port formed between them and opening toward the screen, and a printing agent chamber communicating with the printing agent ejection port, and (b) slidably fitted in the printing agent chamber. A printing agent extruding device that presses and extrudes the printing agent accommodated in the printing agent chamber, and (c) the printing agent. And a printing material container moving device for moving the container along the screen in a printing direction perpendicular to the width direction of the screen.

In the second invention, the printing agent extruding apparatus further comprises an extruding pressure setting apparatus for setting an extruding pressure for extruding the printing agent, and an extruding pressure for controlling the extruding pressure of the printing agent extruding apparatus to a set value. It is solved by including a control device. In the third invention, further,
The problem can be solved by providing a printing agent supply device for supplying the printing agent to the printing agent chamber.

[0009]

In the screen printing machine according to the first invention,
When the printing agent container is moved along the screen during printing, the printing agent in the printing agent chamber is subjected to extrusion pressure by the printing agent extruding member. However, the printing agent discharge port is blocked by the screen, and the printing agent in the printing agent chamber is
While preventing the outflow to the downstream side in the moving direction of the printing material container by the printing agent outflow prevention wall, while being scraped from the screen by the squeegee located on the upstream side,
It is moved with the printing agent container under pressure towards the surface of the screen. Therefore, at the position facing the through hole of the screen, the printing agent is filled in the through hole by the pressure in the printing agent container.

In the first aspect of the invention as well, the wedge-shaped gap is formed between the squeegee and the screen, and the use of the wedge action to assist the filling of the printing agent into the through hole is not excluded. Not essential. Rather, for the purpose of using up the printing agent in the printing agent container as completely as possible, the width of the printing agent outlet formed between the squeegee and the printing agent outflow prevention wall should be set to the minimum necessary. It is desirable to form the wedge-shaped gap, and the width becomes wider accordingly, so it is desirable not to form it. Incidentally, the printing agent container may be provided in a downward direction with the printing agent outlet opening downward as described in the embodiment section, or may be provided in an upward direction.
It may be provided in an appropriate posture depending on the orientation, position, etc. of the printing surface of the printing material such as landscape orientation. Since the printing agent in the printing agent chamber is forced out by the printing agent pushing member regardless of its own weight or gas, the pushing direction can be freely set, and the installation direction of the printing agent container is not limited.

In the screen printing machine according to the second aspect of the invention, the extrusion pressure of the printing agent is set, and the extrusion pressure control device controls the extrusion pressure to a set value to print an appropriate amount of the printing agent. The extrusion pressure is set to a value suitable for filling an appropriate amount in the through holes of the screen according to the type of printing agent and the viscosity of the printing agent. Further, for example, the printing state of the printing material printed on the printing material is automatically grasped by the operator or by the image pickup device, and if the printing amount is insufficient or excessive, it is manually set to a value to be printed in an appropriate amount. Alternatively, the setting may be changed automatically.

In the screen printing machine according to the third aspect of the present invention, when the printing agent in the printing agent chamber is exhausted (strictly, when it is less than the set lower limit amount), the printing agent is supplied to the printing agent chamber by the printing agent feeding device. Therefore, printing can be continued.

[0013]

As described above, in the screen printing machine according to the first aspect of the present invention, the printing agent is printed by being pressed by the printing agent extruding member. The printing agent can be pressurized even when the amount of the printing agent is low, and as in the case where the printing agent is pushed out by supplying gas, a gas passage is formed in the printing agent when the remaining amount of the printing agent is low, and the printing agent is discharged. Almost all of the printing agent in the printing agent chamber can be used up without running out. Also,
The printing agent in the printing agent chamber is contained in a closed space formed by the printing agent outflow prevention wall, the squeegee, and the printing agent extruding member, and is shielded from the atmosphere, so that the oxidation and the change in the viscosity are suppressed well.

In the screen printing machine according to the second aspect of the present invention, the printing agent is extruded at an extrusion pressure according to the type and viscosity of the printing agent and printed in an appropriate amount, thereby improving the printing accuracy.

In the screen printing machine according to the third aspect of the present invention, even if the printing agent in the printing agent chamber is used up, printing can be continued by the supply by the printing agent supply device, so that printing on a large number of printing materials can be performed efficiently. It can be carried out. In addition, since it does not matter even if the capacity of the printing agent chamber is reduced, it remains in the printing agent container when the printing agent container needs to be replaced due to a change in the size of the material to be printed. The amount of printing agent can be reduced, and the residual printing agent can be easily discharged. Further, it is possible to automate the printing process by automating the printing agent supply device.

Preferred Embodiment of the Invention

The preferred embodiments of the present invention will be listed below and related explanations will be given as necessary. (1) The extrusion pressure control device includes extrusion pressure detection means for detecting the extrusion pressure, and extrusion member drive force control means for controlling the drive force of the extrusion member moving device based on the detection result of the extrusion pressure detection means. The screen printing machine according to claim 2 or 3, which comprises:

(2) The screen printing machine according to any one of claims 1 to 3 and aspect 1, wherein the pushing member moving device has an air cylinder as a drive source. (3) The pushing member moving device uses an air cylinder as a driving source, the pushing pressure detecting means includes an air pressure detecting means for detecting the air pressure of the air cylinder, and the pushing member driving force control means detects the air pressure. The screen printing machine according to aspect 1, further comprising air pressure adjusting means for adjusting the air pressure of the air cylinder based on the detection result of the means. If the air cylinder is used as the drive source, the extrusion member moving device can be constructed at low cost, and the extrusion pressure can be easily controlled.

(4) The printing agent container includes a container body, the squeegee, and a fixing device for removably fixing the squeegee to the container body.
The screen printing machine according to any one of aspects 1 to 3.
In the screen printing machine of this aspect, for example, when the squeegee is worn, only the squeegee needs to be replaced,
The cost can be reduced as compared with the case where the entire printing agent container is replaced.

(5) The screen printing machine according to aspect 4, wherein the container body is formed by disassembling a plurality of members. In the screen printing machine of this aspect, for example, when cleaning the printing agent container, the squeegee can be removed from the container body and the container body can be disassembled, and in particular the surface forming the printing agent chamber can be cleaned cleanly.

(6) The container body of the printing agent container has a printing agent supply port for supplying a printing agent to the printing agent chamber,
The screen printing machine according to Aspect 4 or 5, further comprising: a closing member that closes the printing agent supply port, and the screen printing machine includes an opening / closing device that moves the closing member to open and close the printing agent supply port. . In the screen printing machine of this aspect, the blocking member closes the printing agent supply port at the time of printing, the printing agent in the printing agent chamber does not leak when pushed out by the extrusion member, and the blocking member moves at the time of feeding the printing agent. Then, the printing agent supply port is opened to allow the printing agent to be supplied.

(7) The printing agent chamber is provided between the first printing agent container constituent member to which the printing agent container is fixedly mounted on the mounting member, and the first printing agent container constituent member. Container main body having a second printing agent container constituent member that is rotatable relative to the first printing agent container constituent member and that forms the first printing agent container constituent member and the second printing agent. A second printing agent container constituting member constitutes the closing member, and a squeegee attached to one of the container constituting members and an outflow prevention wall provided on the other side, and the opening / closing device is the second 7. The screen printing machine according to aspect 6, which includes a rotating device that rotates a printing material container constituent member about a printing material discharge port formed between the squeegee and the outflow prevention wall. In the screen printing machine according to this aspect, the opening formed between the second printing agent container constituent member and the first printing agent container constituent member is rotated so as to open the printing agent chamber. It acts as a mouth and allows the printing agent to be dispensed.

(8) The screen printing according to aspect 7, including a positioning device for positioning the second printing agent container constituent member with respect to the first printing agent container constituent member at a position where the printing agent chamber is formed. Machine. (9) Aspect 7 or 8 including a printing agent supply device having a printing agent supply source and a printing agent supply source moving device that moves the printing agent supply source along the second printing agent container constituent member
Screen printing machine described in. In the screen printing machine according to aspect 9, in the state where the second printing agent container constituent member is rotated to open the printing agent chamber, the printing agent supply sources are the first and second printing agent container constituent members. The printing material is supplied by being moved in the space between.

(10) The printing agent supply device includes a printing agent supply source, a printing agent moving means for moving the printing agent from the printing agent supply source to the printing agent chamber, and a printing agent supply source side from the printing agent chamber. 7. A screen printing machine according to claim 3, further comprising a backflow preventing means for preventing backflow of the printing agent into the screen printing machine. The backflow prevention means prevents the printing agent from flowing back to the printing agent supply source side during printing after the printing agent is supplied to the printing agent chamber. It is used and an appropriate amount of printing agent is filled in the through holes of the screen. In particular, when the extrusion pressure is set, it is ensured that the printing material is extruded at the set extrusion pressure.

(11) The printing agent moving means is movable with the printing agent receiver integrally provided with the printing agent container and continuously provided in the printing agent chamber, and the printing agent receiver. A provided printing agent pushing member, a pushing position for pushing the printing agent pushing member into the printing agent chamber, and a retraction that creates a space apart from the printing agent chamber to receive the printing agent on the printing agent receiver 11. The screen printing machine according to aspect 10, further comprising a pushing member moving device that moves the pressing member to a position. (12) The screen printing machine according to aspect 11, further comprising a printing agent supply source moving device that moves the printing agent supply source along the printing agent receiver. In the screen printing machine according to aspect 12, the printing agent supply source may be moved once in a direction parallel to the width direction of the screen to supply the printing agent, or may be reciprocally moved, as described in the example section. May be supplied. Further, the supply is not limited to the direction parallel to the width direction of the screen, but may be moved in a direction intersecting the width direction of the screen for supply.

(13) The pressing position of the printing agent pressing member is such that the printing agent pressing member closes the printing agent supply port of the printing agent container, and the front end surface of the printing agent pressing member is the wall surface of the printing agent chamber. 13. The screen printing machine according to aspect 11 or 12, which is a position forming a part thereof and in which a printing material pushing member constitutes the backflow preventing means. The printing agent pushing member keeps the printing agent supply port closed when the printing agent is pushed into the printing agent chamber, and prevents the backflow of the printing agent.

(14) Aspects 11 to 1 having a stopper device for stopping the movement of the printing material pushing member at the pushing position
The screen printing machine according to any one of 3 above. (15) The screen printing machine according to any one of claims 1 to 3 and aspects 1 to 14, further comprising a printing agent remaining amount detecting means for detecting a remaining amount of the printing agent in the printing agent chamber. (16) The screen printing machine according to Aspect 15, including a printing supply device control unit that supplies a printing agent to the printing agent supply device based on a detection result of the printing agent remaining amount detection unit.

(17) The printing agent container has a pair of the squeegees, and one of the squeegees functions as the printing agent outflow preventing wall. Screen printing machine. In the screen printing machine of this aspect, of the pair of squeegees, the squeegee on the upstream side in the printing direction functions as a squeegee, and the squeegee on the downstream side functions as a printing agent outflow prevention wall. for that reason,
The printing agent container can print the printing agent on the material to be printed during both the forward and backward movements, so that a screen printing machine with high printing efficiency can be obtained.

(18) The screen printing machine according to any one of claims 1 to 3 and 1 to 17, further comprising a printing material container moving device for moving the printing material container toward and away from the screen. . (19) A squeegee contact load control device for controlling a contact load of the squeegee on the screen.
3. The screen printing machine according to any one of aspects 1 to 18. If the contact load of the squeegee on the screen is too large, the squeegee may be severely worn or the screen may be damaged. May remain on top. By controlling the contact load, the squeegee can be brought into contact with the screen with a proper load, and the occurrence of the above problems can be avoided.

(20) A printing agent container mounting member to which the printing agent container is mounted, and a mounting device for removably mounting the printing agent container to the printing agent container mounting member. The screen printing machine according to any one of 1 to 19. In the screen printing machine of this aspect,
For example, if the type of printing material changes and it is necessary to replace the squeegee with a new printing plate size, the printing material container can be replaced, and the type of printing material can be changed. Can be quickly responded to.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments common to the first to third inventions will be described below in detail with reference to the drawings. In FIG. 3, 10 is a screen support. The screen support base 10 is a rectangular frame body, and is configured to support the screen 12 and the screen frame 14 fixed to the periphery thereof.

The printing device 2 is mounted on the screen support 10.
0 is provided so as to be movable in the X-axis direction parallel to the transfer direction of the printed circuit board by the printed circuit board transfer device (not shown). This X-axis direction is also the printing direction. X on both sides of the screen 12 on the screen support 10
A guide rail 22 extending in the axial direction is fixed, and two guide blocks 26 fixed to a slide 24 of the printing device 20 are movably fitted to each other. The slide 24 is movably arranged above the screen 12, and a nut (not shown) is fixed to the slide 24 and screwed with a ball screw (not shown).
The ball screw is a servo motor 28 for moving the print head (see FIG. 1).
The slide 24 is moved in the X-axis direction by being rotated by (see 1).

A support member 34 is provided upright on both ends of the slide 24 which are separated in the Y-axis direction (the direction orthogonal to the X-axis direction in the horizontal plane and the width direction of the screen 12). Both ends of a support plate 38 arranged in the Y-axis direction are fixed to the upper ends of the support members 34, respectively.

An air cylinder 40 for raising and lowering the print head is fixed downward at the center of the support plate 38 in the longitudinal direction. The piston rod 42 of the print head lifting air cylinder 40 penetrates the support plate 38 and is connected to the piston rod 52 of the contact load adjusting air cylinder 50 as shown in FIG. The contact load adjusting air cylinder 50 adjusts a contact load of the squeegee, which will be described later, to the screen 12, and is lifted and lowered by the print head lifting air cylinder 40.

As shown in FIG. 5, a piston 54 fixed to the piston rod 52 is fitted in a cylinder housing 56 so as to be airtight and slidable, and an air chamber 58 is formed on the upper side of the piston 54 and on the lower side thereof. An atmospheric pressure chamber 60 is formed. The air chamber 58 is selectively communicated with the air source 66 and the atmosphere by switching the electromagnetic direction switching valve 62 and the electromagnetic proportional pressure reducing valve 64, and the cylinder housing 56 is moved up and down.

The electromagnetic direction switching valve 62 is provided between the air chamber 58 and the air source 66, and the electromagnetic proportional pressure reducing valve 64 is provided between the electromagnetic direction switching valve 62 and the air source 66. The switching of the electromagnetic direction switching valve 62 is controlled by the control device 70, and is switched between a state in which the air chamber 58 is in communication with the air source 66 and a state in which the air proportional pressure reducing valve 64 is in communication. In the state where the electromagnetic direction switching valve 62 communicates the air chamber 58 with the air source 66, the cylinder housing 56 is positioned at the rising end position where the bottom wall 72 contacts the piston rod 52.

The switching of the electromagnetic proportional pressure reducing valve 64 is performed by the control device 70 in a state in which the electromagnetic directional switching valve 62 is switched to a state in which the air chamber 58 communicates with the electromagnetic proportional pressure reducing valve 64. As will be described later, the control device 70 controls the supply and stop of the exciting current of the electromagnetic proportional pressure reducing valve 64 based on the contact load of the squeegee on the screen 12, and the contact load of the pressure in the air chamber 58 is predetermined. Control so that the set load is achieved.

As shown in FIG. 1, a mounting plate 76 is fixed to the lower surface of the cylinder housing 56 of the contact load adjusting air cylinder 50 in the Y-axis direction. On the mounting plate 76,
A rotating plate 78 is attached so as to be rotatable around an axis parallel to the X-axis direction. The rotating plate 78 is Y as shown in FIG.
The pair of support plates 80, which are long in the axial direction and are erected on the upper surface of the central portion in the longitudinal direction as shown in FIGS.
6, a support block 84 is rotatably fitted to the support plate 80 and the connection block 82, and a rotation plate 78 is an axis line parallel to the mounting plate 76 in the X-axis direction. It is attached so as to be rotatable around.

Two load sensors 8 are provided below the rotating plate 78.
A print head 90 is attached via 8. The load sensor 88 and the print head 90 can rotate together with the rotating plate 78 about an axis parallel to the X-axis direction, and
The print head is raised and lowered by an air cylinder 40 for raising and lowering and a contact load adjusting air cylinder 50. This ascending / descending is guided by a pair of guide rods 92 fixed to the mounting plate 76 and penetrating the supporting plate 80. Further, a rod 94 is rotatably attached to the attachment plate 76 so as to project above the support plate 38, and the rod 94 is grasped and released by a grasping device 96 attached to the support plate 38. The mounting plate 76 is fixed at a predetermined height or is allowed to move up and down.

As shown in FIG. 1, the two load sensors 88 are provided side by side in the X axis direction at the central position between the rotary plate 78 and the mounting member 100 of the print head 90 in the Y axis direction. Has been. As shown in FIGS. 6 and 7, the main body 104 of the load sensor 88 has a rectangular columnar shape in cross section, and a through hole 106 penetrating the main body 104 in the width direction is formed in an intermediate portion of the main body 104. ing.

The through hole 106 is an elongated hole extending in the longitudinal direction of the main body 104, and the main body 104 is in a state in which the base end portion and the tip end portion are connected by two connecting plate portions which are parallel to each other. . Two strain gauges 108 are attached to the surfaces of the two connecting plate portions facing each other (only two are shown in FIG. 7). These four strain gauges 108 form a bridge circuit 110 shown in FIG. 8. The strain of the strain gauge 108 is converted into an electric signal by the bridge circuit 110, and the strain gauge 108 is transferred to the control device 70 via a signal processing circuit (not shown). Supplied.

A protrusion 114 is formed at the base end of the main body 104, so that one surface of the main body 104, which is orthogonal to both side surfaces of the through hole 106, is made to project outward from the other portion at the base end. Has been. Further, the opening of the through hole 106 has a cover 116 fixed to the base end of the main body 104.
Is covered by. The cover 116 covers the opening of the through hole 106 in a state of being slightly separated from both side surfaces of the main body 104.

The load sensor 88 includes the protrusion 11 of the main body 104.
4 comes into contact with the upper surface of the mounting member 100, and the tip and the rotating plate 7
In the state where the shim 118 (see FIG. 3) is sandwiched between the protrusions 114 and 8, the protrusion 114 and the tip are fixed to the mounting member 100 and the rotating plate 78 by screws. Load sensor 8
8 is attached in such a manner that a slight gap is formed between one end of the main body 104, which is separated in the longitudinal direction, and the mounting member 100, and between the other end and the rotating plate 78. When a vertical load is applied, strain is generated in the strain gauge 108. The control device 70 uses the strain gauge 10
The load applied to the main body 104 is configured to be calculated as a negative value based on the strain generated in No. 8.

A printing agent container 120 is attached to the attachment member 100 of the print head 90 as shown in FIG. As shown in FIGS. 1 and 3, the printing agent container 120 has a first plate-shaped member 122 and a second plate-shaped member 124 that are elongated. The first plate-shaped member 122 and the second plate-shaped member 124 are formed with notches 126 that are open to the side surface and the lower surface and penetrate in the longitudinal direction, and the first plate-shaped member 122 and the second plate-shaped member 124. As shown in FIG. 2, the first plate member 122,
The pin 130 is fitted through the width determining block 128 and the second plate-shaped member 124, and is retained by the retaining ring 132 so as to be integrally coupled with a certain gap.

Further, the first plate-shaped member 122 and the second plate-shaped member 124 are provided at both longitudinal ends thereof with projections 134 (see FIG. 4) projecting upward. The outer surfaces of the pair of protrusions 134 of the first plate-shaped member 122 have the structure shown in FIG.
As shown in FIG. 3, the side plate 136 is fixed, and both ends in the longitudinal direction of the space formed between the first plate-shaped member 122 and the second plate-shaped member 124 are closed. The first plate-shaped member 122, the second plate-shaped member 124, and the side plate 136 form a container body 138.

First plate-shaped member 122 and second plate-shaped member 1
In the notch 126 formed in FIG.
As shown in, a pair of rubber squeegees 142 are fixed. Each of these squeegees 142 has a plate-like shape, and an engaging projection 144 is projected along the longitudinal direction. The engaging projection 144 is provided on the squeegee holding member 146 along the longitudinal direction. Abutment 148 and notch 126
Squeegee holding member 146 while being sandwiched between the squeegee
Is fixed to the first plate-shaped member 122 and the second plate-shaped member 124 with screws 150, so that each squeegee 142 is fixed to the first plate-shaped member 122 and the second plate-shaped member 124.

In such a state where the squeegee 142 and the squeegee holding member 146 are fixed to the first plate-shaped member 122 and the second plate-shaped member 124, respectively, the pair of squeegees 142 and the squeegee holding member 146 are respectively formed. The width determining block 12 is formed by forming a plane continuous with the surfaces of the members 124 facing each other.
A printing agent chamber 154 having a width determined by 8 is formed.

First plate member 122, second plate member 124
The lower surfaces of the squeegees 142 are inclined surfaces 156 inclined downward as they approach each other.
The lower surface of each is an inclined surface 158 located in the same plane as the inclined surface 156. Each tip of these inclined surfaces 158 is approximately 1 mm parallel to the screen 12, respectively.
Planes are formed, and the printing agent discharge ports 160 open toward the screen 12 between the planes. The printing agent discharge port 160 communicates with the printing agent chamber 154 and has the same width as the printing agent chamber 154.
As shown in FIGS. 1 and 3, a printing agent supply port 162 is formed in the second plate member 124 along the longitudinal direction, and is closed by a pressing plate 168. Push plate 1
68 will be described later.

The printing agent container 120 is detachably attached to the attaching member 100 by a pair of engaging devices 170 shown in FIGS. As shown in FIGS. 1 and 3, the attachment member 100 has a support portion 180 that extends downward from one end in the X-axis direction of the portion to which the load sensor 88 is attached. A pair of positioning pins 182 are provided at two positions separated in the Y-axis direction of the supporting portion 180 so as to project in a posture parallel to the Y-axis direction. A protrusion 184 is provided on each of these. These protrusions 18
A fitting groove 186 extending parallel to the Y-axis direction is formed in each of the parts 4, and an engaging member 188 is fitted so as to be movable in the Y-axis direction.

The engaging member 188 has a plate shape and is formed with an elongated hole 190 extending in the Y-axis direction. As shown in FIG. 4, a screw member 192 inserted through the elongated hole 190 sandwiches the spring 194. By being screwed into the protrusion 184 with
An engaging member 188 is attached to the protrusion 184.

As shown in FIG. 3, a protrusion 198 is provided on the upper surface of the central portion of the first plate member 122 in the longitudinal direction. The protrusion 198 has a through hole 200 and an elongated hole 202.
Are formed at a distance in the Y-axis direction, and engagement notches 204 are formed at both ends separated in the Y-axis direction.

When the printing agent container 120 is mounted on the mounting member 100, the first plate-shaped member 122 and the second plate-shaped member 124 are integrally coupled and the first plate-shaped member 122 is attached.
The through hole 200 and the long hole 202 are fitted into the positioning pins 182, respectively. At this time, the screwing of the screw member 192 is loosened, and the engaging member 188 is moved to the retracted position where it does not interfere with the protrusion 198 of the first plate-shaped member 122 in the Y-axis direction. Through hole 2
00 and slot 202 are allowed to be fitted.

After fitting the through hole 200 and the long hole 202 with the positioning pin 182, the engaging member 188 is moved and fitted into the engaging notch 204. At this time, since the engaging member 188 is floated in the engaging groove 186 by the spring 194, it is easy to fit the engaging notch 204.
If the screw member 192 is tightened in this state, the engaging member 1
88 is moved toward the first plate member 122 side against the biasing force of the spring 194. Thereby, the first plate-shaped member 1
22 is pressed against the supporting portion 180 of the mounting member 100,
The printing agent container 120 is attached to the attachment member 100. When the printing agent container 120 is removed, the screw 192 is loosened and the engaging member 188 is retracted to the retracted position.

Creamy solder is accommodated in the printing agent chamber 154 and is pushed out by the printing agent pushing device 220. The printing agent extruding device 220 has an extruding air cylinder 222 as shown in FIG. Air cylinder for extrusion 22
2 is attached downward to a supporting member 224 fixed to the back surface of the supporting portion 180 of the mounting member 100, and a holding member 228 fixed to the protruding end of the piston rod 226.
The extrusion plate 230 is held by.

The holding member 228 has a U-shape as shown in FIG. 4, and a pair of U-shaped arms are extended to the front side of the mounting member 100 (the second plate member 124 side). , Are engaged with the extrusion plate 230. The extruding plate 230 has a size that slidably fits into the printing agent chamber 154, and prevents the creamy solder from entering the gap between the wall surface of the printing agent chamber 154 and the extruding plate 230 at the lower end thereof. A seal member made of a rubber-like elastic material such as rubber or soft synthetic resin is attached. The seal member of the present embodiment has a front end surface which is generally in the shape of a partially cylindrical surface, and the printing agent chamber 154 formed by a plurality of members.
Although there is an advantage that it can overcome the step that may occur on the wall surface of the printing medium without any hindrance, other types of sealing members such as sealing members with sealing lips that can be adhered to both wall surfaces of the printing agent chamber are adopted. Is also possible.

When the push-out plate 230 is moved up and down by the push-out air cylinder 222, the lower end of the push-out plate 230 is fitted in the printing agent chamber 154 even at the rising end position, and is located above the upper edge of the printing agent supply port 162. It is supposed to have Therefore, when the printing agent container 120 is attached to the attachment member 100 as described above, the extrusion plate 2
30 is fitted in the printing agent chamber 154, and the extrusion plate 2
The printing agent container 120 is attached to the attachment member 100 while the 30 is fitted to the holding member 228 at the rising end position.

The pushing air cylinder 222 is a double-acting type air cylinder. As shown in FIG. 1, the two air chambers are connected to the air source 66 by switching the electromagnetic directional control valve 236 and the atmosphere. It is switched to a state in which the pressure in the air chamber is maintained without being communicated with either the air source 66 or the atmosphere. The pressure of the air supplied to the air chamber on the upper side that pushes out the extrusion plate 230 is detected by the extrusion pressure sensor 240, and the control device 70 switches the electromagnetic direction switching valve 236 based on the detection result of the extrusion pressure sensor 240. The plate 230 is controlled to move the printing medium chamber 154 at a preset extrusion pressure.
The air pressure in the air chamber on the extrusion side is controlled to the height at which the creamy solder inside is pushed out.

The rising end position of the extrusion plate 230 is shown in FIG.
The dog 2 attached to the holding member 228 as shown in FIG.
50, and an ascending end position detecting device 254 including an ascending end position sensor 252 attached to the supporting portion 180 of the attaching member 100 and detecting the dog 250. Also,
The lower end position of the push-out plate 230 is detected by a lower end position detecting device 260 including a dog 256 attached to the holding member 228 and a lower end position sensor 258 attached to the support portion 180 and detecting the dog 256. . The lower end position of the extrusion plate 230 is located at the printing agent discharge port 1
It is set at a position retracted from 60 by a relatively small fixed distance (for example, 7.5 mm).

The pressing plate 168 for closing the printing agent supply port 162 will be described. The pressing plate 168 has a size that fits in the printing agent supply port 162 without a gap, and is mounted on the printing agent receiver 270 fixed to the second plate-shaped member 124 so that the second plate-shaped member 124 can be moved toward and away from the second plate-shaped member 124. It is placed. The printing agent receiver 270 has a mounting portion 272 attached to the second plate-shaped member 124, an upper surface thereof located in the same plane as a lower surface of the printing agent supply port 162, and is projected substantially at a right angle from the second plate-shaped member 124. Receiving portion 274 and a pair of side wall portions 2 provided at both ends of the receiving portion 274 parallel to the X-axis direction.
And 76. The mounting portion 272 is formed with a through hole 278 (see FIG. 1) that avoids interference with the screw 150 for fixing the squeegee holding member 146 to the first plate member 122.

The pushing plate 168 is moved by a pushing plate moving device 290. The pushing plate 168, the pushing plate moving device 290, and the printing agent receiver 270 constitute a printing agent pushing device 293. The print head 90 has a printing agent container 120, a printing agent pushing device 220, and a printing agent pushing device 293.

The pushing plate moving device 290 has a pushing air cylinder 292. Air cylinder for pushing 292
Is an air cylinder 2 for extrusion of the printing agent extrusion device 220.
A pair of engaging members 300 are fixed to a mounting member 298 that is fixed to the piston rod 296 and that is mounted downward on a bracket 294 that is mounted on the upper surface of 22. These engaging members 300 have fitting grooves 302, respectively.
Are formed, and a roller 306 attached to one end of the lever 304 is fitted in each.

These levers 304 are crank levers, and support members 310 fixed to the mounting member 100 (see FIG. 2).
(Refer to FIG. 3) is rotatably attached by a shaft 312 and is connected by a connecting member 308. The roller 306 is attached to one arm portion of the lever 304, the roller 314 is attached to the other arm portion, and an engaging notch 318 formed in the moving member 316.
Is fitted to. Notches 320 (see FIG. 3) penetrating in the X-axis direction are formed at both ends of the first plate member 122 and the second plate member 124 in the longitudinal direction, and the moving member 316 has the notches 320. Is movably fitted in the X-axis direction.

The pushing plate 168 is fixed to the protruding ends of the pair of moving members 316. Therefore, the piston rod 296 of the pushing air cylinder 292 is
When the lever is moved up and down, the lever 304 is rotated, the moving member 316 is moved, and the pushing plate 168 is moved on the receiving portion 274. The pressing plate 168 presses the cream-like solder on the receiving portion 274 into the printing agent chamber 154, and is pushed from a position where the printing agent supply port 162 is fitted to close the printing agent supply port 162 and the printing agent container 120. And is moved to a retracted position that creates a space for receiving the creamy solder on the receiving portion 274.

The pushing position of the pushing plate 168 is defined by the stopper projection 284 projecting from the pushing plate 168 coming into contact with the outer surface of the second plate member 124. The stopper protrusion 284 moves the pushing plate 168 so that the tip surface of the pushing plate 168 is exactly the same as the printing agent chamber 1.
It is provided at a position where it is stopped while being located in the same plane as the wall surface of 54.

A printing agent supply device 330 is provided at a printing agent supply position which is one end in the moving direction of the printing apparatus 20. As shown in FIGS. 9 and 10, the pair of beams 332 arranged above the screen support 10 includes a guide rail 334 and a rodless cylinder 33.
6 are attached by a bracket 338 in parallel with the width direction of the screen 12. Rodless cylinder 336
Is, for example, a pneumatic cylinder without a piston rod, which is sold by Towa Kogyo Co., Ltd., and a piece moved along with the movement of the piston in the housing is kept airtight and is projected outside the housing,
The movable table 340 is engaged with the piece. Mobile stand 3
A supporting plate 342 is fixed to the support plate 342.
A fixed guide block 344 is movably fitted to the guide rail 334 to guide the movement of the moving base 340.

A guide rail 334 is vertically provided on the surface of the support plate 342 opposite to the side on which the guide block 344 is fixed. Printing agent feeder 35
0 is attached. The lifting slide 348 is engaged with the piston rod 354 of the air cylinder 352 for raising and lowering the feeder attached to the support plate 342.
The piston rod 354 is moved up and down by expansion and contraction.

The printing material supply device 350 includes a pair of air cylinders 356 for lowering the pistons, and an extruding / stirring motor 3.
The cream-like solder is extruded by the forward rotation of the screw by the screw 58, and when not supplied, the cream-like solder is not extruded by the reverse rotation of the extrusion / agitation motor 358, and is agitated to maintain the viscosity suitable for printing. It is a thing.

The printing agent supply device 350 is moved in the width direction of the screen 12 by the rodless cylinder 336 and is moved up and down by the air cylinder 352 for elevating and lowering the supply device. As shown by the solid line in FIG. Direction, the retracted position separated from the printing device 20 and separated from the printing agent receiver 270 upward, the supply starting position approaching the printing agent receiver 270 and starting the supply of the creamy solder as indicated by the one-dot chain line, and two points. As shown by the chain line, it is moved to and from the supply end position where the supply of creamy solder is ended. The supply start position and the supply end position are detected by a supply start position sensor 360 and a supply end position sensor 362, respectively, which are mounted on the guide rail 334 so as to be positionally changeable.

The screen printing machine having the printing device 20 is controlled by the control device 70. Control device 70
Is mainly composed of a computer, and as shown in FIG. 11, the load sensor 88, the extrusion pressure sensor 240,
The detection signals of the ascending end position sensor 252, the descending end position sensor 258, the supply start position sensor 360, and the supply end position sensor 362 are supplied, and the servo motor 28 for moving the printing device, the air cylinder 40 for raising and lowering the print head, and the electromagnetic wave are supplied. Direction switching valve 62, electromagnetic proportional pressure reducing valve 64, electromagnetic direction switching valve 236, pushing air cylinder 292, rodless cylinder 336, feeder raising / lowering air cylinder 352, printing agent feeder 350 air cylinder 356, extruding / stirring motor. 358 and the like are controlled.

An input device 370 is also connected to the control device 70, and the pushing pressure for pushing out the creamy solder by the printing agent extruding device 220, the lower limit value of the remaining amount of the creamy solder in the printing agent chamber 154, and the like are set. You are able to enter.
The lower limit value of the remaining amount of the creamy solder is set to a value larger than the printing amount on one printed circuit board, for example, a value capable of printing on two printed circuit boards. Even if an error occurs in the remaining amount detection value and the remaining amount is detected more than the actual amount, it is possible to avoid printing in a state where the remaining amount is less than the amount required for printing on one printed circuit board. It has become. The input data is stored in the RAM of the computer.

In a state where the cream-like solder is not contained in the printing agent container 120 and the screen printing machine is completely stopped, the print head 90 is at the rising end position and the gripping device 96 moves the rod 94. Holding the print head 9
It is prevented that 0 is lowered by its own weight and comes into contact with the screen 12 with an excessive load to damage the screen 12 and the squeegee 142. On the other hand, while the screen printing machine is temporarily stopped in the state where the cream-like solder is accommodated in the printing agent container 120, the gripping device 96 is kept in the released state, and the printing agent container 120 adjusts the contact load. By the control of the air cylinder 50 for use, the screen 12 is brought into contact with a predetermined constant load (which may be the same as or less than a set load described later). Further, the printing material container 120 is positioned on one side in the printing direction, and the extrusion plate 230 is maintained at the rising end position.

At the start of printing, the print head 90 is temporarily raised by the contact load adjusting air cylinder 50, and the squeegee 142 is stopped at a position 3 mm above the screen 12. In this state, the total weight W of the print head 90 is applied to the load sensor 88 downward. At this time, 2
The sum of the output values of the individual load sensors 88 is a negative value −W. However, the control device 70 reads the negative value −W, and at the same time, the printing material container 120 becomes empty from the absolute value W thereof. The weight (remaining amount) Ww of the printing agent is calculated by subtracting the weight w of the print head 90 in the state of FIG.

Thereafter, the contact load adjusting air cylinder 50 is used.
The air chamber 58 is communicated with the electromagnetic proportional pressure reducing valve 64, and the pressure in the air chamber 58 is gradually reduced. As a result, the cylinder housing 56 descends and the print head 90 descends. During this descent, the control device 70 controls the output value of the load sensor 88 (until the squeegee 142 contacts the screen 12-
The calculation of adding the absolute value W to (W) is repeated every minute time.
The result of this calculation indicates the contact load F of the squeegee 142 on the screen 12 as a positive value.

When the squeegee 142 is further lowered from the state of contacting the screen 12, the squeegee 142 is elastically deformed and the reaction force F ′ of the contact load F is applied to the main body 104 of the two load sensors 88, The tensile load applied to the strain gauge 108 is reduced. At this time, as described above, the control device 70 causes the contact load F of the squeegee 142 to the screen 12 from the output value of the load sensor 88.
The calculation for obtaining is repeated every minute time and the contact load F is displayed on the display device (not shown), so that the operator can know the contact load F. The load sensor 88 and the portion of the control device 70 that performs the above-described calculation constitute contact load detection means for detecting the contact load.

When the print head 90 is lowered to bring the squeegee 142 into contact with the screen 12, the controller 7
0 controls the pressure of the air chamber 58 of the contact load adjusting air cylinder 50 based on the contact load F of the squeegee 142 to the screen 12. When the contact load F is lower than the set load, the electromagnetic proportional pressure reducing valve 64 is switched to the state of communicating the air chamber 58 with the atmosphere, and when the contact load F is higher than the set load, the state of the air chamber 58 is connected to the air source 66. Switch. Printing is performed and the printing material container 120 is printed.
The total weight of the print head 90 decreases as the amount of creamy solder inside decreases, and it is necessary to reduce the pressure of the air chamber 58 as the amount of creamy solder decreases in order to obtain a contact load suitable for screen printing. However, this requirement is easily satisfied by controlling the pressure of the air chamber 58 based on the contact load F.

Since the pressure control of the air chamber 58 is performed even during the screen printing, even if the parallelism between the surface of the screen 12 and the moving direction of the slide 24 is poor, the contact load F
Is kept at the set load, and printing is performed accurately.

The squeegee 142 sets the screen 1 at the set pressure.
After being contacted with 2, the extrusion plate 230 is lowered and the extrusion pressure is applied to the cream solder. However, since the printing agent ejection port 160 of the printing agent container 120 is closed by the screen 12, the cream solder is not ejected and is appropriately pressurized. When the print head 90 is moved along the screen 12 in this state, the cream solder in the printing agent chamber 154 is prevented from flowing out of the printing agent chamber 154 by the squeegee 142 located on the downstream side in the printing direction. Squeegee 142 located upstream
Is scraped off the upper surface of the screen 12 by the
The printing material container 120 is moved in the state of being housed in the screen 54 along with the movement of the printing material container 120. Every time the printing agent discharge port 160 faces the through hole of the screen 12, the creamy solder corresponding thereto is pushed into the through hole, and the excess creamy solder is scraped off by the squeegee 142 located on the upstream side. Fills the through hole.

On the outer surface of the squeegee 142 opposite to the side where the printing agent chamber 154 is formed, the inclined surface 158 is formed as described above.
The squeegee 142 can reliably scrape the cream-like solder from the upper surface of the screen 12.
Further, since a flat surface parallel to the screen 12 is formed at the tip of the squeegee 142, the friction resistance when the squeegee 142 moves on the screen 12 is small,
Moreover, excessive wear of the squeegee 142 is avoided.

The extrusion plate 230 is lowered as shown in FIG. 12 as the creamy solder is pushed out, but the pressure of the air chamber on the extrusion side of the extrusion air cylinder 222 is detected by the extrusion pressure sensor 240, and the creamy solder is obtained. Since the air pressure is controlled so as to be extruded with a preset pressure, the cream solder is always extruded with the set extrusion pressure even if the cream solder decreases.

After printing on one printed circuit board,
The squeegee 142 is separated from the screen 12 so that the load sensor 88 detects the total weight of the print head 90. When the printing material container 120 is raised and the squeegee 142 is separated from the screen 12, both of the two air chambers of the extrusion air cylinder 222 are opened to the atmosphere, and the creamy solder remains on the screen 12. Instead, it leaves the screen 12 together with the printing material container 120. The control device 70 controls the load sensor 8 in this state.
As described above, the remaining amount of the creamy solder is calculated from the detected value of No. 8, and if the remaining amount is larger than the lower limit value, the squeegee 142 again.
Is brought into contact with the screen 12, and the printing device 20 is moved in the direction opposite to that of the previous printing to print the cream solder on the printed circuit board.

When the remaining amount of the printing agent becomes equal to or less than the set lower limit weight, the print head 90 is moved to the printing agent supply position in order to replenish the creamy solder. When the printing agent container 120 is moved to the printing agent supply position, the extrusion plate 230 is moved to the rising end position, and the printing agent supply port 1
62 is opened to allow the cream-like solder to be supplied to the printing agent chamber 154. Further, the control of the electromagnetic proportional pressure reducing valve 64 by the control device 70 is stopped, and the print head 90 is lifted by the contact load adjusting air cylinder 50 and the print head elevating air cylinder 40 while the slide 24 prints the printing material. It is moved to the feeding position.

As shown in FIG. 9, the printing agent container 120 is stopped with the printing agent receiver 270 positioned below the printing agent feeder 350, and the pressing plate 168 is disengaged from the printing agent feeding port 162. After being moved to the retreat position, the printing agent supply device 350 is moved down as shown by the chain double-dashed line, moved from the supply start position to the supply end position while pushing out the creamy solder, and on the receiving portion 270. The creamy solder is placed in a straight line.

When the creamy solder is placed on the receiving portion 270, the weight of the print head 90 increases. When supplying the creamy solder, the squeegee 142 is separated from the screen 12, and the downward load applied to the load sensor 88 increases. At the time of supplying the creamy solder, the total weight W of the print head 90 is calculated based on the output value of the load sensor 88, and the print head 90 is calculated from this total weight.
By subtracting its own weight w, the sum of the creamy solder remaining in the printing agent chamber 154 and the newly supplied creamy solder is calculated, and this sum is scheduled to be printed before the print head 90 is replaced. Lower limit weight (printing of the last printed type) from the required weight (this weight is calculated from the number and type of printed circuit boards) that is the weight of the cream solder required to print on the printed circuit board (It is set slightly larger than the weight required to print one board.)
When it becomes larger by the amount, the extrusion of the creamy solder in the printing agent supply device 350 is stopped. When the required weight is larger than the maximum weight that can be stored in the printing material container 120, when the sum reaches the maximum weight, the extrusion of the cream solder is stopped. If the extrusion of the creamy solder is stopped before the printing agent supply device 350 reaches the supply end position, the printing agent supply device 35 reaches the supply end position.
0 can be moved the remaining distance without pushing out the creamy solder.

Irrespective of the required weight, a fixed amount of creamy solder may be constantly supplied, or the creamy solder may be extruded until the printing agent supply device 350 reaches the supply end position. Although it may be continued, in these cases, when the print head 90 is replaced,
It is unavoidable that a certain amount of creamy solder remains in the printing agent container 120, and the waste of the creamy solder increases when it is discarded, and the recovery amount is large when it is recovered and reused. It is troublesome to increase.

After moving to the supply end position, the printing material supply device 3
50 is moved to the retracted position, and in parallel with that, the pushing plate 168 is moved to the pushing position. As a result, the creamy solder placed on the receiving portion 270 is pushed by the pushing plate 168, and is pushed into the printing agent chamber 154 through the printing agent supply port 162. At this time, the pair of side wall portions 276 prevent the creamy solder from protruding laterally. The pushing plate 168 is moved until the stopper protrusion 284 contacts the second plate-shaped member 124, and
The pressing air cylinder 292 keeps the pressing position, and prevents the creamy solder from flowing back from the printing agent chamber 154 to the printing agent supply port 162.

When the creamy solder is printed for the first time after the creamy solder is supplied, there is a gap between the extrusion plate 230 and the upper surface of the creamy solder in the printing agent chamber 154, and the extrusion plate 230 corresponds to this gap. After the movement, the creamy solder can be pressed, and thereafter, the creamy solder is kept in contact with the creamy solder.

As described above, in the screen printing machine according to the present invention, the creamy solder in the printing agent chamber 154 is pushed out by the extrusion plate 230 and printed, so that almost all of the creamy solder in the printing agent chamber 154 is printed. Can be used for printing. In particular, in this embodiment, since the width of the printing agent chamber 154 is narrow and the same as the printing agent ejection port 160, this effect can be best enjoyed. In addition, the printing agent chamber 154 is a chamber having a small volume, and the mass of the creamy solder contained in the printing agent chamber 154 is small. Therefore, the inertia of the printing apparatus 20 is small and the vibration at the time of stoppage is small, so that the printing apparatus 20 can be moved at high speed and the printing efficiency can be improved.

Further, the extruding plate 230 is constantly brought into contact with the cream-like solder in the printing agent chamber 154, except that the cream-like solder is exposed to the atmosphere at the printing agent ejection port 162 and the container body 138 and the extruding plate. 230
Is kept enclosed in the space formed by
Almost no oxidation or change in viscosity occurs.

As is clear from the above description, in the present embodiment, the printing device moving servo motor 28, the ball screw and the nut (not shown) constitute the printing agent container moving device which is the printing head moving device, and extrude. The plate constitutes a printing agent extruding member, and the extruding air cylinder 222 constitutes an extruding member moving device. An input device 274 for inputting the extrusion pressure of the creamy solder, and a portion for storing a value input using the input device 370 of the control device 70 in the RAM constitute an extrusion pressure setting device, and the extrusion pressure sensor 24
0 constitutes air pressure detection means which is a kind of extrusion pressure detection means, and the portion for controlling the switching of the electromagnetic directional control valve 62 based on the detection value of the extrusion pressure sensor 240 of the control device 70 is the extrusion member driving force control means. It constitutes an air pressure adjusting means that is a type of.

The printing agent supply device 350 constitutes a printing agent supply source, the pushing plate 168 constitutes a printing agent pushing member, the pushing air cylinder 292 constitutes a pushing member moving device,
The printing agent receiver 270 constitutes a printing agent moving unit. Further, the pushing plate 168 also functions as a backflow preventing means. The rodless cylinder 336, the moving table 340, and the like constitute a printing material supply source moving device. The stopper protrusion 284 provided on the pressing plate 168 and the portion of the second plate member 124 that contacts the stopper protrusion constitute a stopper device. Based on the detection values of the load sensor 88 and the load sensor 88 of the control device 70, the difference between the total weight of the print head 90 and its own weight in an empty state in which the cream solder is not accommodated in the printing agent chamber 154 is calculated to obtain the cream shape. The portion that detects the remaining amount of solder constitutes the printing material remaining amount detection means,
A lower end position detection device 260, which is a kind of an extruding member movement limit detection device that detects the lower end position of the extruding plate 230.
Is a kind of printing agent remaining amount detecting means, and constitutes a printing agent running-out detecting means for detecting that the printing agent is exhausted.

When the remaining amount of the creamy solder detected by the printing agent remaining amount detecting means of the control device 70 becomes smaller than the lower limit weight, the portion for supplying the creamy solder to the printing agent supply device 330 is the printing agent supply device. It constitutes the control means. The squeegee holding member 146 and the screw 150 form a fixing device that fixes the squeegee 142 to the container body 138. The print head raising / lowering air cylinder 40 constitutes a printing agent container raising / lowering device which is a print head raising / lowering device, and controls the pressure of the air chamber 58 of the contact load adjusting air cylinder 50 based on the contact load F of the controller 70. The part constitutes a squeegee contact load control device.

Another embodiment common to the first to third inventions will be described with reference to FIGS. In the present embodiment, the second plate-shaped member 404 forming the container body 402 of the printing agent container 400 is rotated to open the printing agent chamber 406 and supply the cream solder. The same parts as those in the above-described embodiment are designated by the same reference numerals to show the corresponding relationship, and the description will be omitted.

As shown in FIG. 15, two load sensors 8
A plate-shaped supporting member 412 is fixed to the lower surface of the mounting portion 410 extending below the mounting member 408 mounted on the lower surface of the plate 8 in parallel with the width direction of the screen, and the longitudinal direction of the supporting member 412. Side plates 414 are fixed to both end faces in the direction.

The printing material container 400 is removably attached to the attachment portion 410 between the pair of side plates 414. The container body 402 includes a second plate member 404.
, The first plate-shaped member 418, and the first plate-shaped member 418 fixed to both end surfaces in the longitudinal direction of the first plate-shaped member 418, respectively.
6 and a closing plate 420 that closes the opening in the longitudinal direction. The front end of the closing plate 420 extends from the first plate-shaped member 418 toward the second plate-shaped member 404, and the front end surface contacts the surface of the second plate-shaped member 404 on the first plate-shaped member 418 side. By contacting with each other, the opening in the longitudinal direction of the printing material chamber 406 is closed and both plate-shaped members 404 and 418 are provided.
Stipulates the interval of. As for the first plate-shaped member 418 and the second plate-shaped member 404, the printing agent container 400 is attached to the mounting portion 4.
In the state of being detached from 10, the pair of engaging devices 430
(Only one shown in FIGS. 13 and 14) is held in an integrally engaged state.

The engagement device 430 has a shaft 432 rotatably fitted to the first plate member 418 as shown in FIG. A plate-shaped engaging member 434 is fixed at a right angle to the axis of the shaft 432 at a protruding end of the shaft 432 that is protruded from the first plate-shaped member 418 to the side opposite to the second plate-shaped member 404. . On the surface of the engaging member 434 on the first plate member 418 side, as shown in FIG. 15, the central portion in the width direction is highest,
An engagement surface 435 having a partially cylindrical surface shape that is lower toward the edge is formed.

Further, the protruding end of the shaft 432, which is projected from the first plate member 418 to the second plate member 404 side, is
A coil spring 436 which is a spring as an urging means is fitted and a lever 438 is fixed. A portion of the second plate-shaped member 404 corresponding to a portion of the first plate-shaped member 418 on which the shaft 432 is provided is notched, and the shaft 4
32 is projected without interfering with the second plate member 404, and the fitting end 4 of the oval cross section is provided at the projecting end of the shaft 432.
40 is formed, and a female screw hole (not shown) is formed at the tip of the fitting portion 440.

The lever 438 has a T-shape as shown in FIG. 13, and is fitted into the fitting portion 440 in a relatively non-rotatable manner in an elongated hole 442 formed at one end of a T-shaped horizontal bar (arm portion). After being assembled, the bolt 444 is screwed into the female screw hole formed in the fitting portion 440 and is fixed to the shaft 432. The coil spring 436 is the lever 43.
8 and the first plate-shaped member 418 are sandwiched in a compressed state, and the engaging member 434 is pressed against the mounting portion 410 via the shaft 432 while the first plate-shaped member 418 is pressed against the mounting portion 410. .

An engaging member 448 is fixed to the other end of the T-shaped horizontal bar. The main body of the engaging member 448 is a male screw member having a hole with a bottom in the center, and is screwed into a female screw hole formed at the other end of the T-shaped horizontal bar and is fixed by a lock nut. The axial position is adjustable. The bottomed hole of the male screw member is opened at the end face on the side facing the first plate-shaped member 418, and a part of the ball is exposed to the outside at the open end and the ball is prevented from coming off the male screw member. The compression coil spring in the male screw member biases the male screw member in the protruding direction. The engaging member 434 is moved from the shaft 432 to the engaging member 448.
It is extended to the side opposite to the side.

Therefore, the lever 438 is rotated around the axis of the shaft 432 by operating the operating portion 450 constituted by the vertical bar portion of T shape. If it is rotated to the position shown by,
The engagement tool 448 engages with the engagement recess 452 of the second plate member 404 in the ball to integrally connect the first plate member 418 and the second plate member 404, while the engagement member 434.
Is removed from the back surface of the mounting portion 410 of the mounting member 408,
The state where the first plate member 418 is allowed to be detached from the mounting portion 410 is obtained.

On the other hand, if the lever 438 is rotated to the position shown by the solid line in FIG. While the integral connection is released, the engaging member 4
34 engages with the attachment portion 410, and the first plate member 418 is attached to the attachment member 408. At this time, the engaging member 43
4 is guided by the engagement surface 435 having a partially cylindrical shape, and engages with the attachment portion 410 against the biasing force of the coil spring 436,
The first plate member 418 is pressed against the mounting portion 410 by the urging force of the coil spring 436, and is stably mounted on the mounting member 408.

As shown in FIG. 16, the mounting portion 410 has
A pair of positioning pins 454 (only one of which is shown in the figure) are provided so as to be spaced apart in the width direction of the screen. When the printing agent container 400 is mounted on the mounting member 408, the pair of positioning holes 456 formed in the first plate-shaped member 418 is fitted into the positioning pin 454. The positioning pin 454 has a length that penetrates the first plate-shaped member 418 and projects toward the printing agent chamber 406 side, and a conical positioning recess 458 is formed on the projecting end surface.
Further, a positioning member 460 is provided on the second plate member 404 so as to project therefrom. The positioning member 460 is screwed into the female screw hole of the second plate member 404 and is fixed by a lock nut.
A conical positioning protrusion 462 is provided on the tip end portion protruding from the side surface forming 06.

When the first plate-shaped member 418 is fitted into the positioning pin 454 in the positioning hole 456, the surface of the second plate-shaped member 404 forming the printing agent chamber 406 abuts on the tip end surface of the positioning pin 454. , The distance between the first plate-shaped member 418 and the second plate-shaped member 404, the printing agent extrusion device 470.
The thickness is specified to be slightly larger than the thickness of the extruded plate 230 of FIG. In addition, the positioning convex portion 462 has the positioning concave portion 458.
Then, the position of the second plate member 404 in the direction parallel to the plate surface of the first plate member 418 is determined.

The printing material container 400 is a mounting member with the extruding plate 230 of the printing material extruding device 470 sandwiched between the first plate-shaped member 418 and the second plate-shaped member 404, as in the above-described embodiment. It is attached to and removed from 408. The printing agent extruding device 470 is configured similarly to the printing agent extruding device 220. However, the dog 4 of the rising end position detecting device 474 for detecting the rising end position of the push-out plate 230, respectively.
76 is attached upward to the upper surface of a holding member 228 that holds the push-out plate 230, and a rising end position sensor 478 is attached.
Is a support member 22 to which the air cylinder 222 for extrusion is attached.
4 attached. Further, the dog 482 of the descending end position detecting device 480 for detecting the descending end position of the pushing plate 230 is attached downward to the lower surface of the holding member 228, and the descending end position sensor 484 is attached to the supporting member 412 connecting the side plate 414. It is installed.

The first plate member 418 is rotated by the rotating device 490. In this embodiment, the print head 49
1 includes a printing agent container 400, a printing agent pushing device 470, and a rotating device 490. Rotating device 49
Reference numeral 0 has a rotating air cylinder 492. The rotating air cylinder 492 is attached downward to a supporting member 494 attached to the pushing air cylinder 222 of the printing agent pushing device 470. An engagement member 498 is fixed to the tip end portion of the piston rod 496 in parallel with the width direction of the screen, and fitting grooves 500 are formed at both end portions of the engagement member 498 separated in the longitudinal direction. .

Each of the fitting grooves 500 has a roller 50 rotatably attached to one end of a lever 502.
4 is fitted. As shown in FIG. 17, each of the pair of levers 502 is rotatably attached to the side plate 414 at the central portion in the longitudinal direction by a shaft 506, and one end thereof cannot be relatively moved by an L-shaped connecting plate 508. As shown in FIG. 14, the roller 5 is connected to the bracket 510 fixed to the connecting plate 508.
04 is rotatably mounted and fitted in the fitting groove 500.

At the other end of the lever 502, the first link 5
One end of 14 is rotatably connected by a shaft 516, and the other end of the first link 514 is rotatably connected by a shaft 518 to a rotating plate 520. Rotating plate 52
0 is arranged outside the side plate 414, leaving a very small gap between the side plate 414 and the side plate 414.

A second link 522 having a dogleg shape is connected to the center of the first link 514 in the longitudinal direction by a shaft 524 so as to be relatively rotatable. One end of the second link 522 is rotatably attached to the side plate 414 by a shaft 526, and one end of the third link 528 is attached to the shaft 5 at the other end.
It is connected by 30 so that relative rotation is possible. The other end of the third link 528 is connected to the rotating plate 520 by a shaft 532 so as to be relatively rotatable. Therefore, when the piston rod 496 of the rotating air cylinder 492 is expanded and contracted, the vertical movement of the engagement member 498 is converted into the rotational movement by the lever 502, the first, second, and third links 514, 522, 528. Is transmitted to the rotating plate 520.

The upper surface of the rotating plate 520 is positioned in the same plane as the upper surface of the second plate-shaped member 404 as shown in FIG. 1
3 and the prism-shaped engagement block 53 as shown in FIG.
4 is fixed. The engagement block 534 extends beyond the upper side plate 414 to the upper surface of the rotating plate 520. As shown in FIGS. 13 and 19, a V groove 536 as an engaging groove is formed in the middle of the front surface of the engaging block 534, and a chamfer 537 is provided on the upper edge of the front surface. These actions will be described later.

On the other hand, a support block 538 is integrally provided on the upper surface of the rotating plate 520 as shown in FIG. As shown in FIGS. 13 and 17, the support block 538 extends over the side plate 414 and extends beyond the second plate member 404.
Is an L-shaped member having a width reaching the upper end of the engaging block 534, which is connected to the upper surface of the rotating plate 520 on one arm 540 on the rear side of the engagement block 534 and the other arm 54.
2 extends above the engagement block 534. The engaging block 534 is just fittable within the rectangular recess formed by the upper surface of the rotating plate 520 and the arm portions 540 and 542 of the support block 538. The support block 538 is formed with a bottomed fitting hole 544 that opens to the end surface of the arm portion 542, and a spring receiver 548 provided in the engagement lever 546 is fitted therein.

As shown in FIG. 13, the engaging lever 546 includes a rod-shaped operating portion 550 and a rod-shaped engaging portion 550 which respectively project outward in the radial direction from two diametrically separated portions of a bottomed cylindrical spring receiver 548. And a joint 552. A coil spring 556, which is a spring as an urging means, is arranged in a spring receiver 548 fitted in the fitting hole 544,
The screw member 558 penetrates the bottom wall of the spring receiver 548 and the fitting hole 544 and is fixed to the bottom wall by the nut 560, whereby the engagement lever 546 is biased by the coil spring 556 and the engagement portion 552
Are elastically engaged with the V groove 536 of the engagement block 534. Therefore, the engaging portion 552 is formed with a protrusion having a V-shaped cross section that can be engaged with the V groove 536. Due to the formation of this projection and the formation of the chamfer 537, the engagement portion 552 is favorably engaged with the engagement block 534 when the engagement lever 546 is rotated. This is because when the engagement lever 546 is rotated, engagement and disengagement of the engagement portion 552 with the engagement block 534 is guided by the protrusion of the V-shaped cross section and the slope of the chamfer 537.

As shown in FIG. 13, since the engaging portion 552 engages with the engaging groove 536 of the engaging block 534 fixed to the second plate member 404, the engaging state is stably maintained,
The engagement block 534 is fitted into the rectangular recess formed by the rotating plate 520 and the support block 538 as described above, and the engagement portion 552 of the engagement lever 546 and the arm portion 540 of the support block 538 are fitted together. Is sandwiched from the front and rear by the and to be integrally engaged with the rotating plate 520, and the engaging block 534, and thus the second plate member 404, is rotated by the rotating plate 520.
It can be rotated integrally with. This engagement is performed by the engagement lever 5
46 against the biasing force of the coil spring 556,
It can be released by rotating it from the engagement position shown in FIG. 3 to a non-engagement position separated by 90 degrees. It should be noted that the side plate 414 is provided with the closing plate 420 and the second plate member 40 when the second plate member 404 is rotated together with the rotating plate 520.
4 has a closing portion 562 that closes an opening formed between the opening 4 and the opening 4.

As described above, when the printing agent container 400 in which the first plate member 418 and the second plate member 404 are integrally engaged by the engaging device 430 is attached to the attachment member 408, The coupling lever 546 is rotated to the non-engaging position, and the first plate member 418 is moved to the positioning pin 454.
First, the engaging lever 546 is rotated to the engaging position to engage the engaging portion 552 with the engaging block 534 of the second plate member 404. Next, the lever 438 of the engagement device 430 is operated to move the first plate member 418 to the mounting member 408.
And the second plate member 404 is disengaged from the first plate member 418. As a result, the second plate-shaped member 404 moves with respect to the first plate-shaped member 418 to the rotating plate 5
It becomes rotatable with 20.

The control device for controlling the screen printing machine according to this embodiment is the same as the control device 70 according to the above-described embodiment, except that the air cylinder 492 for rotation is replaced with the air cylinder 492 for rotation.
Are the same except that they are controlled, and illustration and description thereof are omitted.

Also in the screen printing machine of the present embodiment, the printing agent container 400 is moved while the extrusion plate 230 pressurizes the cream solder, and the cream solder is printed on the printed circuit board. Then, when the remaining amount of the creamy solder in the printing agent chamber 406 becomes equal to or lower than the lower limit value, the print head 491 is moved to the printing agent supply position, and the cream is supplied by the printing agent supply device 330 similar to that in the above-described embodiment. Solder is supplied.

After the print head 491 is moved to the printing agent supply position, the rotating plate 520 is rotated as shown in FIG. At this time, the engaging portion 55 of the engaging lever 546
The second plate-shaped member 404 sandwiching the engaging block 534 from the front and the rear by the arm 2 and the arm 540 of the support block 538 is rotated together with the rotating plate 520, and the printing agent chamber 406 is opened. The printing agent supply device 350 of the printing agent supply device 330 does not interfere with the print head 491 in the width direction of the screen at the time of printing as in the above-described embodiment, and the printing agent container 400 is provided.
Although it is in a retracted position apart from the upper side,
After being lowered to a position where the creamy solder can be supplied into the opened printing agent chamber 406, the creamy solder is pushed out and moved in the width direction of the screen to supply the creamy solder. When the printing agent chamber 406 is opened, the blocking portions 562 of the pair of side plates 414 are on both sides of the second plate member 404 to prevent the creamy solder from squeezing out.

After the supply, the printing material supply device 350 is lifted up and separated from the printing material container 400, and then moved to the retracted position in the width direction of the screen. 520 is rotated, and the second plate-shaped member 404 moves together with the first plate-shaped member 418 to the printing agent chamber 40.
The printing material chamber 406 is returned to the position that constitutes 6 and the creamy solder is filled in the printing agent chamber 406.

As described above, the second plate-shaped member 404 constituting the printing agent container 400 is rotated to open the printing agent chamber 406, and the creamy solder is directly supplied to the wall surface of the printing agent chamber 406. In this case, the cream-like solder does not adhere and remain on a portion other than the surface forming the printing agent chamber 406, that is, a portion that is normally exposed to the atmosphere, and the cream-like solder solidifies for cleaning. There is no need to do it. The blocking portion 562 of the side plate 414 prevents the creamy solder from squeezing out of the second plate member 404, but the supply of the creamy solder by the printing agent supply device 350 is started from a position distant from the side plate 414 and is ended. Therefore, the creamy solder hardly adheres to the side plate 414, and the creamy solder does not adhere and remain on the side plate 414.

Further, since the printing agent container 400 is constructed by assembling a plurality of members such as the first plate-shaped member 418, the second plate-shaped member 404, the closing plate 420, etc., it is disassembled into the printing agent chamber. The surface forming 406 can be easily cleaned.

As is apparent from the above description, in the present embodiment, the first plate-shaped member 418 constitutes the first printing agent container constituent member, and the second plate-shaped member 404 is the second printing agent container. The positioning pin 454 constitutes the component member and the printing agent chamber 4
No. 06 width determining device, and includes the engaging recess 452 of the positioning pin 454 and the positioning protrusion 4 of the positioning member 460.
Reference numeral 62 constitutes a positioning device that determines the position of the second plate member 404 with respect to the first plate member 418. In addition, the rotating air cylinder 492, which is a kind of drive source, is provided with the lever 502, the first, second, and third links 514, 522, 5
A rotation device that rotates the second plate-shaped member 404 is configured together with the motion transmission mechanism including the rotation plate 28 and the rotation plate 520.

In each of the above embodiments, the squeegee 14
A pair of 2 is provided, but only one may be provided. In this case, printing is done in only one direction. Every time printing of the printing agent on one printing plate is completed, the print head is raised and returned to the print start position set on the upstream side in the printing direction. At this time, the squeegee is separated from the screen. Then, the weight of the print head is detected, and the remaining amount of cream solder is detected.

Further, the squeegee may have a surface which is inclined in a direction in which the printing agent discharge port is narrower than the printing agent chamber. By doing so, the squeegee has an action of scraping up the printing agent attached to the portion other than the through hole of the screen.
Also in this case, it is desirable to reduce the contact surface with the screen by providing a relief on the surface in contact with the screen. Further, the squeegee may have a surface that is inclined in a direction in which the printing agent discharge port is wider than the printing agent chamber. In this way, the wedge action of the wedge-shaped gap formed between the squeegee and the screen can be used to fill the screen through hole with the printing agent.

Although the squeegee is made of rubber in each of the above embodiments, it may be made of metal. In this case, it is desirable that the screen is made of a material that will not be damaged even if the metal squeegee slides.

Further, the printing agent chamber is not limited to a space having a constant width in the moving direction of the printing agent extruding member, and for example, a portion far from the printing agent ejection port may be widened. With this configuration, the amount of the printing agent accommodated in the printing agent chamber can be increased, the number of times the printing agent is supplied can be reduced, and the printing efficiency can be improved. In particular, it is effective when printing a printing agent on a printing plate having a large size or a large number of through holes and a large printing amount.

Further, in each of the above embodiments, the extruding plate 230 constituting the printing agent extruding member was mechanically connected to the piston rod 226 of the extruding air cylinder 222 and moved. A piston may be integrally provided on the extruding member, and the printing agent extruding member may be moved by supplying air to the air chamber.

Further, the pushing member moving device may have a motor, which is a kind of a driving source, and a motion converting mechanism for converting the rotation of the motor to the movement of the printing material pushing member and transmitting the movement. For example, a load detecting device is provided in the motion converting mechanism to measure the pushing pressure of the printing material pushing member, and the driving torque of the motor is controlled so that a predetermined pushing pressure can be obtained.

Further, the printing material supply device may be moved by the operator in the width direction of the screen so as to supply the printing material onto the printing material receiver or the second plate member.

Further, in each of the above-mentioned embodiments, the creamy solder is replenished when the remaining amount of the creamy solder in the printing agent chamber of the printing agent container falls below the lower limit value. The number of printed sheets may be set, and the printing material may be replenished when a predetermined number of printed sheets have been printed. The number of printed sheets is calculated from the weight of the printing agent that can be stored in the printing agent chamber and the amount of printing agent required for one printed circuit board. Also in this case, it is desirable that the number of printed sheets is set so that the replenishment is performed in a state in which the amount of the printing agent remains larger than the amount required for printing on one printed circuit board. In addition, since the error of the printing amount for one printed circuit board may be accumulated,
Even when the print agent is supplied by setting the number of printed sheets, it is desirable that the supply amount of the print agent be controlled based on the detection of the load of the load sensor 88 when the print agent is supplied. Further, it is desirable to detect the moving end position of the printing material extruding member so that it can be detected that the printing material has run out. Due to an input error of the amount of printing agent required for one printed circuit board by the operator, a failure of the load sensor 88, etc., it is determined that printing is performed even though there is actually no printing agent left. This is to prevent it. Further, any one of the various printing agent remaining amount detecting means described above, or a plurality of them may be appropriately combined and employed.

Further, the contact load adjusting air cylinder 50.
Is designed to lift the load sensor 88 and the print head 90 by supplying air to the air chamber 58, and lower the load sensor 88 and the print head 90 by discharging air from the air chamber 58. It is not possible to apply a contact load to 12 that exceeds the total weight of print head 90. Therefore, when a contact load exceeding the total weight of the print head 90 is required, for example, the contact load adjusting air cylinder 50 can be operated in both directions by supplying air to the chambers on both sides of the piston 54. In addition, a pressure control device for controlling the operating pressure in the direction in which the squeegee 142 is pressed against the screen 12 may be provided.

Further, in each of the above embodiments, the contact load of the squeegee on the screen is detected and adjusted before the start of printing, and is not detected or adjusted during printing. However, it is detected and adjusted during printing. You may do it. By doing so, for example, even if there is an inclination or unevenness in the printing direction on a single screen or printed circuit board, the creamy state can be applied to the entire printed circuit board by a constant or preset contact load by detecting and adjusting the contact load. The solder can be printed.

Also, two contact load adjusting air cylinders 50 are provided in the longitudinal direction of the squeegee 142.
The contact load may be made different at a plurality of positions in the longitudinal direction, or even if the screen 12 has irregularities, the contact load may be uniform. For example, in the above embodiment, 1 is calculated based on the sum of the output values of the two load sensors 88.
Although the individual contact load adjusting air cylinders 50 are controlled, the two contact load adjusting air cylinders 50 are individually controlled based on the output values of the two load sensors 88. You can do it like this.

Further, the present invention can be carried out in a mode in which the combination of the constituent elements of each of the above embodiments is changed. Besides, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is a front view showing a cross section of a main part of a print head of a screen printing machine which is an embodiment common to the first to third inventions.

FIG. 2 is a front view of the print head.

FIG. 3 is a side view of the screen printing machine.

FIG. 4 is a plan view of the screen printing machine.

FIG. 5 is a diagram showing a circuit for supplying air to a contact load adjusting air cylinder that adjusts a contact load of the printing apparatus of the screen printing machine.

FIG. 6 is a front view showing a load sensor of the screen printing machine.

FIG. 7 is a plan sectional view of the load sensor.

FIG. 8 is a diagram showing a bridge circuit of the load sensor.

FIG. 9 is a side view showing a print head and a printing material supply device of the screen printing machine.

FIG. 10 is a front view showing the printing agent supply device.

FIG. 11 is a view showing a part of a control device for controlling the screen printing machine, which is deeply related to the first to third inventions.

FIG. 12 is a front sectional view showing a state in which the printing agent extruding device of the screen printing machine extrudes creamy solder.

FIG. 13 is a side view showing a screen printing machine as another embodiment common to the first to third inventions.

FIG. 14 is a plan view of the screen printing machine shown in FIG.

FIG. 15 is a front view (partial cross section) showing the print head of the screen printing machine shown in FIG.

16 is a front cross-sectional view showing a positioning device for positioning the first plate-shaped member that constitutes the printing agent container of the screen printer shown in FIG. 13 with respect to the second plate-shaped member.

FIG. 17 is a front view of the print head shown in FIG.

FIG. 18 is a diagram illustrating an operation of the print head illustrated in FIG. 17 when a printing agent is supplied.

FIG. 19 is a front cross-sectional view showing an enlarged part of the print head shown in FIG.

[Explanation of symbols]

 12 Screen 20 Printing Device 28 Servo Motor for Moving Printing Agent Container 40 Air Cylinder for Elevating Printing Head 50 Air Cylinder for Adjusting Contact Load 70 Control Device 88 Load Sensor 90 Printing Head 120 Printing Agent Container 142 Squeegee 154 Printing Agent Chamber 160 Printing Agent discharge port 162 Printing agent supply port 168 Pressing plate 220 Printing agent extruding device 222 Extrusion air cylinder 230 Extrusion plate 240 Extrusion pressure sensor 270 Printing agent receiver 284 Stopper protrusion 290 Pushing plate moving device 292 Pressing air cylinder 293 Printing agent pushing Device 330 Printing agent supply device 400 Printing agent container 402 Container body 404 Second plate member 406 Printing agent chamber 470 Printing agent extruding device 490 Rotating device 491 Printing head

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manabu Mizuno 19 Chasuyama, Yamamachi, Chiryu-shi, Aichi Fuji Machinery Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A screen printing machine for printing a printing agent such as cream solder or an adhesive on a printing plate such as a printed circuit board through a through hole formed in the screen, the squeegee extending in the width direction of the screen. A printing agent container having a printing agent discharge port that is formed between the printing agent outflow prevention wall and the printing agent outflow prevention wall that are arranged to face it and that opens toward the screen, and a printing agent chamber that communicates with the printing agent discharge port. And a printing agent extruding member slidably fitted in the printing agent chamber, and an extruding member moving device for moving the printing agent extruding member, and pressurizing the printing agent accommodated in the printing agent chamber. Screen for ejecting the printing agent, and a printing agent container moving device for moving the printing agent container along the screen in a printing direction perpendicular to the width direction of the screen. Printer. 2. An extrusion pressure-related amount setting device that sets an extrusion pressure-related amount related to an extrusion pressure at which the printing agent extruding device pushes out the printing agent, and an extrusion pressure-related amount of the printing agent extruding device are set. The screen printing machine according to claim 1, further comprising an extrusion pressure-related quantity control device controlling the value. 3. The screen printing machine according to claim 1, further comprising a printing agent supply device that supplies a printing agent to the printing agent chamber.