JPH0760269B2 - Screen form applicator applicator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a coating device for coating a screen surface of a screen mold for screen printing with a coating agent such as a photosensitive agent.

2. Description of the Related Art: As is well known, the screen type used for printing on a sheet-like article is a type in which a gauze is tightly attached to an aluminum rectangular frame and the surface is coated with a photosensitizer. It is formed by baking the pattern. In order to form a photosensitizer coating film on the screen surface of this screen type, a screen frame which is upholstered is leaned against and the photosensitizer solution is applied to the screen surface.

When applying this photosensitizer solution, it is required that the film thickness be even, that a skilled technician needs to perform the work, and that the work efficiency is improved. The method of doing is proposed and put to practical use. Specific examples thereof include JP-B-5-32622 and JP-A-59-1.
It is known from, for example, Japanese Patent No. 39035.

Problems to be Solved: In the above-mentioned prior art, the former is effective in the case of a relatively small screen type because it is a type of automatically performing a series of operations from coating formation to drying of the photosensitive film. However, since it is a coating process type on only one side,
It is still insufficient to make the coating uniform, and it is difficult to use it for the treatment of large screen formwork.

In the latter of the prior art, the photosensitive agent can be applied simultaneously from both sides of the screen surface to form a uniform coating film. However, in this device, the coating squeegees are arranged to face each other through the screen, and the squeegees are moved while keeping the contact state of both squeegees constant, so that the coating liquid has a relatively low viscosity. Even if the photosensitizer solution is effective, pinholes may occur during application of a highly viscous material such as a rubbery solution used as a reinforcing agent. Further, in the case of a screen formwork for printing a large screen surface, for example, a large-sized article such as a blanket, a powerful squeegee is used to perform a powerful scraping operation.
There is an increasing need to prevent damage to the screen surface, which requires a sufficient reinforcement of the screen surface. Therefore, when applying a rubber-like reinforcing agent to the screen surface, with a large-sized screen formwork, for example, the width dimension becomes 2000 mm or more. Since the frame of the vertically elongated part is distorted, the vertical member is generally long, and the gauze is stretched so that the entire surface is even, so when the aspect ratio of the frame is large, the bending force acts on the vertical member and bulges outward. The deformation phenomenon occurs.
Moreover, even though the gauze is attached to the frame body in a tensioned state, so-called slackness is inevitably caused in a large plate, and it is difficult to make the coating film thickness uniform.

For this reason, in order to effectively apply the operation of applying the photosensitizer and the reinforcing agent to the wide screen mold, the prior art is still in a situation that cannot be satisfied.

The present invention has been made to solve the above-mentioned problems, and when applying the target coating agent to the screen surface, the squeegee for application and the screen surface are applied so as to give tension to the gauze. It is an object of the present invention to provide a coating device for a coating agent for a screen form which is improved so that a uniform contact state can be maintained over the entire width and the photosensitive agent and the like can be reasonably coated evenly on the screen surface. To aim.

Means for Solving the Problems: In order to achieve the above-mentioned object, a device for applying a coating agent for a screen formwork according to the present invention comprises a mechanism for fixing and holding the upper and lower parts of the screen formwork. In an upright position, the applicator squeegee is moved in contact with the screen surface to apply the coating agent in the vertical direction. A front side applicator support frame and a back side applicator support frame are respectively installed between the elevating frames, and the applicator advancing / retreating operation for advancing / retreating each applicator receiving / supporting frame with respect to the screen surface on the elevating frame. A cylinder and an applicator tilting operation cylinder for tilting and operating each applicator receiving and supporting frame are attached, and the front side applicator receiving and supporting frame and the back surface are provided. An applicator in which a squeegee is provided at the tip of the coating liquid reservoir on the applicator support frame with a width corresponding to the screen frame to be processed, and rollers that come into contact with the screen surface at the time of coating operation are provided on both left and right sides. Is detachably installed so that the back side applicator squeegee precedes the front side applicator squeegee or the front side applicator squeegee when applying to the screen surface to be processed by these applicators. The applicator squeegee is provided with a support frame adjustment mechanism for adjusting the vertical positional relationship between the applicator support frames.

In the present invention, the applicator is provided with a positioning seat piece on its bottom surface, and the applicator receiving and supporting frame on which the applicator is mounted has a positioning recess into which the positioning seat piece fits, and the applicator. It is preferable that a suction mechanism for sucking and holding the bottom surface is provided.

Operation: In the coating apparatus of the present invention, when performing a coating operation on a large-sized screen formwork, the long dimension is set to the sideways direction in order to mount the screen formwork to be processed, and the screen surface is fixed by the fixed holding mechanism. Attach it so that it is almost upright. Prepare a liquid applicator for the screen surface that has a length that corresponds to the in-frame method of the target screen mold, and install it on the front and back applicator support frame that is installed between a pair of lifting frames. To be used by mounting each.

In addition, in these applicators, the squeegee faces the screen surface, and the positioning seat piece attached to the bottom surface is fitted to the positioning portion on the applicator support frame,
It can be easily fixed in a fixed position by the operation of the suction mechanism provided with the applicator support frame, and can be easily removed.

When applying the coating agent to the screen surface, put the coating agent into the coating device on the back side, and when the squeegee on the front side contacts the screen surface, place it below the squeegee position on the back side. Set so that it is positioned by adjusting the vertical movement of the support part of the applicator support frame. The applicator advancing / retreating operation cylinder and the applicator tilting operation cylinder are operated to bring the squeegees of both the front and back applicators into contact with the screen surface and move upward to apply the coating agent from the back surface side of the screen. At this time, the squeegee in contact with the surface side of the screen not only scatters the liquid applied by the squeegee of the preceding applicator to bleed to the front side through the weave, but also scrapes the excess amount. In addition, the rollers provided on both the left and right sides of each applicator come into contact with the non-applied surfaces (adhesive paper sticking parts) at both ends, which become printing paste reservoirs when using the screen form during the application operation, and A uniform coating thickness is obtained by compensating for the tension at the coating position. When the position where the coating operation is completed is reached, first lower the rear side of the coating device using the tilting cylinder for the coating device and then operate so that the squeegee moves away from the screen surface so that the coating liquid does not adhere excessively. It has become.

When applying the coating agent on the front side of the screen surface,
Put the coating agent in the applicator on the front side, and set the squeegee attached to the front side applicator so that it is located above the position of the squeegee attached to the back side applicator. Apply in the same way. When applying, the squeegee attached to the applicator on the side that receives the application liquid should be applied first, and the squeegee position setting for both the front and back applicators should be adjusted vertically with the other as the reference. I just need to be able to do it.

Thus, in the apparatus of the present invention, when applying the target coating liquid, the screen surface immediately after the coating is scraped with a squeegee on the surface opposite to the coating surface to evenly and surely apply the coating liquid. A gauze that can be applied and is particularly liable to sag can be applied to the left and right sides of the gauze by applying pressure to the rollers to create a tensioned state, which makes it possible to equalize the thickness of the film. With respect to the distortion of the frame body caused by this, by changing the direction when the screen form frame was attached and making it horizontally long, it became possible to work without any hindrance.

Further, since the applicator is positioned and held by the receiving frame by the operation of the suction mechanism, it can be easily removed by stopping the operation of the suction mechanism, and a complicated fixing mechanism. It is convenient because it can be replaced without the need for.

Example: An example of the device of the present invention will be described below with reference to the drawings.

1 to 6 show an apparatus for applying a sensitizer or the like by bringing a squeegee for application on each of the front and back sides of the screen of the screen to be treated, and the support frame 1 moves the work step back and forth. On a slender base 2 arranged in a vertical direction, a pair of columns 3, 3 are erected so as to face each other at a required interval.
The upper ends of 3 and 3 are connected by a connecting beam 4.
Both struts 3 and 3 are hollow bodies with their opposite sides open, and the screw shaft 5 is inside them (using a ball screw shaft allows smooth operation without vibrating the squeegee during operation). With the center as the center, guide shafts 6, 6 are provided upright on both sides in parallel. On the open side of both columns 3 and 3, the lifting frame 10
However, the boss 11 protruding from the back surface to the inside of the support column 3 is fitted and slid on the guide shafts 6, 6, and the female screw 12 fitted in the center of the boss 11 is screwed on the screw shaft 5. Equipped so that it can be raised and lowered freely. 7 is a drive motor for the screw shaft 5, 7'is a line shaft, and 7 "is a power branch bevel gear pair.

Applicator support mechanisms 20 are symmetrically attached to the front surfaces of both the elevating frames 10. The applicator support mechanism 20 is mounted on the lifting frame 10 as shown in FIGS. 2 and 4 to 6 (shown in FIG. 1 attached to the lifting frame 10 located on the right side). Two applicator advancing / retreating operation cylinders 21 and 22 are arranged in parallel in one half. The applicator advancing / retreating operation cylinder 21 located on the upper side is rearward at the base end (the direction is shown with reference to the screen surface to be applied).
The same shall apply hereinafter) The protruding support shaft 21A is attached to the support piece 25, and the tip end of the piston rod 21 'is attached to the two parallel guide rods 26, 26', and the slide piece 23 is attached. It is designed to operate the required stroke. The applicator advancing / retreating operation cylinder 22 located on the lower side has the piston rod 22 'oriented in the opposite direction to the upper applicator advancing / retreating operation cylinder 21, and the tip end screw portion 22A of the piston rod 22'.
To the support piece 25 via an adjusting sleeve 24 having an internally threaded portion screwed together, and the tip end portion of the cylinder body 22 ″ to the lower guide rod (the longest rod located in the middle portion) 26. And another guide rod 26 ″ parallel to it and mounted on slidable mounting pieces 27, respectively, so that the mounting piece 27 can operate with a required stroke together with the cylinder body 22 ″. The mounting piece 23 attached to the piston rod 21 'of the upper applicator advancing / retreating operation cylinder 21 is a protrusion projecting toward the cylinder body 21 ″ side in the axial direction of the applicator advancing / retreating operation cylinder 21 at the center of the mounting piece 23. 23 'is attached. 21B is a spacer for positioning.

Further, applicator tilting operation cylinders 28, 28 'are pivotally supported at both ends at the both ends of the surface of the elevating frame 10 through brackets 29 at their base ends so that the piston rods 28 "face upward. It is set up.

A fork piece 29 'attached to the tip of each piston rod 28 "of each applicator tilting operation cylinder 28, 28' and mounting pieces 23, 27 attached to the upper and lower applicator advancing / retreating operation cylinders 21, 22. The applicator support frames 30 and 30 'are connected and supported at both side ends thereof, and the applicator support frames 30 and 30' are installed between the both elevating frames 10 and 10. One applicator support frame The frame 30 (for backside coating in the specific example) is a piston rod 21 ′ of the applicator advancing / retreating operation cylinder 21 with the tip side being a side plate.
To the mounting piece 23 attached to the mounting piece 23, the connecting projection 31 'and the pin 32 are connected, and the connecting piece 31 attached to the lower side of the rear end portion and the piston rod 28 ″ of the applicator tilting operation cylinder 28 ″ end fork piece 29 ′.
The pins 33 are connected to and supported. On the other hand, the other applicator receiving / supporting frame 30 '(for surface application in the specific example) is a cylinder for applying / retracting the applicator whose side is the tip side.
A bracket 27 'is attached to a mounting piece 27 attached to the cylinder body 22 "of 22 and a pin 32' is connected to the bracket 27 ', and a connecting piece 31' attached to the lower side of the rear end and an applicator tilting operation cylinder 28. Piston rod 28 ″ fork piece 29 ′ with end
And are supported by connecting the pin 33 '. The tip side support pin 32 'of one applicator support frame (the surface side in this example) is supported by a bracket 27' attached to the mounting piece 27 and can be moved up and down by an adjusting screw 35. It is configured as follows. Therefore, the squeegee 41 attached to the applicator 40 mounted on the applicator support frame 30 on the back side
Squeegee 41 'attached to the applicator 40' on the front side with respect to (described later)
Both (below) can move about 10 mm (not limited to this value) up and down.

Each of the applicator support frames 30 and 30 'is provided with a hole (may be a recess) having an appropriate size as a positioning portion 36 in the intermediate portion of the upper surface, and sucks by negative pressure at appropriate intervals. A plurality of suction pads 47 'of the suction mechanism 47 are attached.
These suction pads 47 'are both applicator support frames 30,3
It is supported by a receiving piece 34 provided on the lower side of 0 ', and is connected to a suction source (not shown) by a hose so that it does not project from the upper surface of the applicator support frame 30, 30'.

Both of the applicators 40, 40 'have their front and upper surfaces opened,
The squeegees 41, 4'are integrally formed at the front end with a flat shape having a length corresponding to the screen surface width of the processed frame, and are formed at the front end thereof.
Immediately after 1 ', a trough-shaped shallow groove-shaped groove 42 is integrally formed over the entire width. Both of these applicators 40,4
In 0 ', a required number of positioning seat pieces 43 that match the positioning portions 36 on the applicator support frames 30, 30' are fixedly attached to the bottom surface, and the positioning seat pieces 43 and the positioning portions 36 are engaged with each other. The suction pads 47 'are used to fix the applicator support frames 30 and 30', respectively. Further, rollers 44 for tensioning the cloth are attached to both ends of the longitudinal sides.

A lower frame body holding mechanism 50 for fixing and holding the frame body of the screen form A has a pair of power-operated clamps 52 on a lower beam 51 provided at an appropriate height above the base 2 of the support frame 1. , 52 (In the specific example, the one in which the movable piece of the clamp is opened and closed by the air cylinder is used)
Are provided, and the screen mold A is supported by the clamps 52, 52. The upper frame body holding mechanism 54
A movable beam 55 provided with a female screw that is screwed into a screw portion provided on the upper half of one of the guide shafts 5 in the columns 3 and 3 and is vertically movable, and attached to the movable beam 55. It is composed of a pair of power-operated clamps 56, 56 that grip the upper part of the frame of the screen form A (similar to the lower part, operated by an air cylinder in the specific example).

The movable beam 55 is moved up and down by transmitting power from a motor 58 attached to the upper portion of one of the columns 3 to a guide shaft 6 via a line shaft 57 along the connecting beam 4 via a gear train. ing. Also this movable beam
The limit switch 60 stops the lowering of the movable beam 55 when it comes into contact with the top of the frame of the screen form A, and stops the raising of the elevating frame 10 when the upper limit is reached by the coating operation by the applicators 40, 40 '. Limit switches 61 and are attached.

As shown in FIG. 4, the applicator advancing / retreating operation cylinders 21 and 22 described above include an adjusting piece 24A fitted and supported on a supporting piece 25 with respect to a support shaft 21A of the applicator advancing / retreating operation cylinder 21 on the back side. A female screw 24A 'is screwed into a threaded portion at the end of the support shaft 21A so that the applicator advance / retreat operation cylinder 22 can be advanced and retracted.
The contact state between 41 and the rear surface of the screen a (see FIG. 2) can be adjusted. As for the applicator advancing / retreating operation cylinder 22 on the front side, the front side adjusting piece 24B screw sleeve 24 supported by the supporting piece 25 and the adjusting supporting piece 25 '.
And the piston rod 22 'end threaded portion 22A of the applicator advancing / retreating operation cylinder 22 are screwed together, and the applicator advancing / retreating operation cylinder 22 is entirely advanced and retracted by the rotation of the adjusting piece 24B, and the squeegee 41' and the surface of the screen a. The contact state with is adjusted.

According to the apparatus of the present invention having such a structure, the target screen mold A is clamped to the clamps 52, 5 of the lower frame holding mechanism 50.
2, the movable beam 55 of the upper holding mechanism 54 and the clamp 56,
56 is operated and the screen a is fixed in a substantially vertical state. At this time, in the case of the wide screen form A,
Fix with the side that will be the glue reservoir facing sideways. In the fixing operation, first, the lower side of the frame is fixed, then the movable beam 55 is lowered with the clamps 56, 56 of the upper frame holding mechanism 54 opened, and the lower limit switch 60 attached The movable beam 55 stops when the upper part of the frame is ready to be gripped.

When applying the photosensitizer to the screen a, the applicators 40 and 40 'having a required width are used, and the applicator 40 containing the known photosensitizer is placed on the applicator support frame 30 on the back side. Place it. When the applicator 40 is placed on the applicator support frame 30, the positioning seat piece 43 on the bottom of the applicator 40 is fitted to the positioning portion 36 on the applicator support frame 30 side, and the suction mechanism is used.
47 is operated and suction-held through the suction pad 47 '. Therefore, by stopping the operation of the suction mechanism 47, the applicator 40 can be easily removed from the applicator support frame 30.

The applicator 40 'on the front surface side with respect to the applicator 40 on the back surface side is
When the squeegee 41 'was placed on the applicator support frame 30' without the photosensitizer in the above manner and the squeegee 41 'was in contact with the surface of the screen a, it was slightly lowered from the contact position of the applicator squeegee 41 on the back side. The support screw 32 'is operated by the adjusting screw 35 to set the position (about 10 mm in the specific example).

To move to the dispensing operation, first move the applicator forward / backward operation cylinder
Actuating 21,22, each squeegee 41,4 of the applicator 40,40 '
1'is brought into contact with the screen a, and thereafter the applicator tilting operation cylinders 28, 28 'are operated to apply the applicators 40, 40'.
As shown in FIG. 8 by lifting the rear portion of the screen, the photosensitizer solution in the applicator 40 is transferred onto the squeegee 41, and the elevating frames 10, 10 are driven to rise so that the photosensitizer is applied to the back surface of the screen a. Is applied. At this time, the squeegee 41 'on the front side that follows acts to scrape and evenly spread the photosensitizer solution applied to the back side and oozing from the weave to the surface. It is scraped into the applicator 40 '. Also, during this coating operation, the coating device 40, 40 '
Rollers 44 are attached to both sides of the squeegee by pressing and rolling the astringent paper sticking surface (or the opposite surface) as a non-photosensitive surface that serves as a printing paste reservoir of the screen a by the rollers 44 on both sides. Tension force is applied to the screen a surface with which 41 and 41 'are in contact by the horizontal component force due to the pressing force on both sides thereof, so that the contact surface between the squeegees 41 and 41' and the screen a is evenly distributed over the entire length. Therefore, the slack in the screen a in the large-sized screen form is eliminated, and a uniform coating film can be obtained.

When the uppermost position is reached, the limit switch 61 attached to the movable beam 55 of the upper frame holding mechanism 54 stops the ascending drive of the elevating frame 10, and thereafter, the applicator is supported opposite to the start. Activate mechanism 20 to turn squeegees 41, 4
1'is separated from the screen a surface, and thereafter the screw shaft 5 is reversed to return the applicator support mechanism 20 together with the elevating frame 10 to the lower standby position (see FIG. 9).

Next, in order to apply a reinforcing agent, the applicator 40 'on the front side is applied to the applicator 40 on the back side, and the contact position of the squeegee 41' is more The support pin 32 'is manipulated by the adjusting screw 35 so as to be located at a slightly upper position (also in this example, there is a difference of about 10 mm, but not limited to this).

During the coating operation, the reinforcing agent can be coated by operating the squeegee 41 'on the front side in the same manner as when coating the photosensitive agent. Of course, when reaching the highest level, the squeegees 41, 41 'can be separated from the surface of the screen a to form a uniform reinforcing film without causing dripping of the coating liquid in the same manner as the above-mentioned operation of coating the photosensitive agent. At the time of this operation, the liquid that has been scraped by the squeegee 41 of the back side applicator 40 and scraped off as an excess is the applicator 40
Housed in.

When applying the liquid with the squeegee 41 or 41 ', since the gutter-shaped groove 42 is provided behind the squeegee 41, 41', the applicator 40, 40 'is tilted for applying the liquid to the squeegee side. When the squeegee is supplied, the squeegee is once received and supplied to the portion in contact with the screen a surface of the squeegee, so that the liquid can be surely applied without running out of liquid. Also, the squeegee 41, 41 'and the screen a
The state of contact with the surface is the front and back applicator advance / retract operation cylinders 21 and 22.
By rotating the adjustment pieces 24A, 24B associated with the above and adjusting the advancing / retreating, it is possible to easily set.

EFFECTS OF THE INVENTION According to the present invention, with respect to the screen surface of the screen frame to be processed, on both the left and right sides of the applicator in contact with the squeegee,
The roller is pressed against the non-coated surface of the screen so that the screen surface is in even contact over the entire length of the squeegee. By scraping off the liquid, a uniform coating film can be easily formed even with a large-sized screen mold, and the screen surface can be reinforced reliably and easily.

[Brief description of drawings]

The drawings show an apparatus according to an embodiment of the present invention.
The figure is a front view of the entire apparatus, FIG. 2 is a front view of an elevating frame equipped with an applicator support mechanism, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is for operating the applicator of the applicator support mechanism. FIG. 5 is a diagram showing only the cylinder mounting portion, FIG. 5 is a diagram showing a mode of one applicator receiving frame mounting portion of FIG. 4, and FIG. 6 is FIG.
VI-VI view, FIG. 7 is a view showing a cross section of the applicator receiving and supporting portion, and FIGS. 8 and 9 are views showing one mode of the applying operation. 1 ... Support frame, 2 ... Base 3 ... Strut, 4 ... Connecting beam 5 ... Screw shaft 6 ... Guide shaft, 7 ... Drive motor 10 ... Lifting frame, 11 ... Boss 12 ... Female Screw, 20 …… Applicator support mechanism 21,22 …… Applicator advance / retreat operation cylinder 21 ′, 22 ′ …… Piston rod 22 ″ …… Cylinder body, 24A …… Back side adjustment piece 24B …… Front side adjustment piece, 25… … Supporting piece 26,26 ′, 26 ″ …… Guide rod 23,27 …… Mounting piece 28,28 ′ …… Applicator tilting operation cylinder 28 ″ …… Piston rod, 29 …… Bracket 29 ′ …… Fork piece 30 , 30 ′ …… Applicator support frame 31,31 ′ …… Coupling piece, 32,32 ′, 33,33 ′ …… Pin 34 …… Receiving piece, 35 …… Adjusting screw 36 …… Positioning part, 40, 40 '... Applicator 41, 41' ... Squeegee, 42 ... Groove 43 ... Positioning seat, 44 ... Roller for tensioning 47 ... Adsorption mechanism, 47 '... Suction pad 50 ... lower frame holding mechanism, 51 ...... lower beam 52, 56 ...... clamps, 54 ...... upper frame holding mechanism A ...... screen frame, a ...... screen

Continuation of the front page (56) Reference JP 59-139035 (JP, A) JP 60-48044 (JP, A) JP 60-188949 (JP, A) JP 63-296050 (JP , A) JP 59-111150 (JP, A) JP 57-120938 (JP, A) JP 51-92202 (JP, A) Actual development 61-124714 (JP, U) Actual development 59-144659 (JP, U) Actually opened 63-74640 (JP, U) Actually opened 62-33058 (JP, U) Actually opened 60-74152 (JP, U) Actually opened 59-192151 (JP, U) Actual development Sho 58-11741 (JP, U) Actual development Sho 48-36902 (JP, U) Japanese Patent Sho 60-52432 (JP, B2) Japanese public Sho 58-53332 (JP, B2) Japanese public Sho 56 -32622 (JP, B2) Actual public 59-26363 (JP, Y2) Actual public 55-36833 (JP, Y2) Actual public 58-41537 (JP, Y2)

Claims (2)

[Claims] 1. A screen comprising a mechanism for fixing and holding the upper and lower portions of a screen formwork, wherein the screen formwork is placed in a substantially upright state, and an applicator squeegee is brought into contact movement with the screen surface to apply the coating agent in the vertical direction. In a device for applying a coating agent for a mold, a front side applicator support frame and a back side applicator support frame are installed between a pair of left and right elevating frames on the front and back sides of a screen to be processed, respectively. The elevating frame is provided with an applicator advancing / retreating operation cylinder for advancing / retreating each applicator receiving / supporting frame with respect to the screen surface, and an applicator tilting operating cylinder for tilting operation of each applicator receiving / supporting frame. A squeegee is provided at the tip of the coating solution reservoir on the applicator support frame and the back side applicator support frame with a width corresponding to the screen frame to be processed. And an applicator having rollers which come into contact with the screen surface at the time of coating operation is attached to the left and right sides so that the applicator squeegee on the back side is the front surface when the applicator is applied to the screen surface to be treated. Side applicator squeegee so that the front side applicator squeegee precedes the back side applicator squeegee. An applicator applicator for a screen form, which is provided with a support frame adjusting mechanism. 2. A positioning seat piece is provided on a bottom surface of the applicator, and a positioning recess into which the positioning seat piece is fitted is provided in the applicator support frame on which the applicator is mounted, and the applicator. 2. A device for applying a coating agent for a screen form according to claim 1, further comprising a suction mechanism for suction-holding a bottom surface of the screen.