JPS6344331Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a packaging machine suitable for use in bagging articles.

``Prior art'' Packaging machines used to pack goods into bags include:
There is a type (so-called book type) in which bundled bags are turned over one by one, the hanging bags are opened, goods are put in, and the top end of the bag is heat-sealed after the goods have been put in (the so-called book type). A type in which the bags are transported one by one to a predetermined position and hung down, the bag is opened at this position, the item is put in, and then the upper end of the bag is heat-sealed (this is the so-called kangaroo method, for example, 56-43703), but the latter has the advantage of being more suitable for automation. In both cases, the opening operation of the bag is performed by blowing air to the upper end of the bag.

The belt-shaped bags used in kangaroo-type packaging machines are constructed by vertically connecting individual bags along perforations. Therefore,
During the bag filling process, if the weight of the item placed in the bag is large, the weight of the item may cause the perforation to be cut before sealing and the bag to fall, resulting in the contents being lost. This causes the inconvenience of scattering to the surrounding area.

Therefore, in conventional packaging machines, the lower end of the bag is supported by a plate-shaped holding member, and
As in the device of No. 25195, both sides of the bag container 1 are gripped by carriers 23, thereby preventing the above-mentioned inconvenience. Further, as in Japanese Patent Application Laid-Open No. 53-100079, the packaging sheet 15 is pushed up from the bottom to the top by the push-up member 64 to align the cutting edge 15c with the cutting position.

"Problems to be Solved by the Invention" However, although the above-mentioned conventional packaging machine can prevent bags from falling, it has the following various disadvantages.

With the configuration in which the bottom of the bag is lifted, the edges of the open end of the bag cannot be aligned well, and as a result,
Wrinkles, etc. tend to occur in the heat-sealed part, which tends to cause sealing defects.Also, since the alignment of the opening edges varies depending on the contents, there is a problem that the edge alignment is not uniformly adjusted and becomes uneven. .

Since the opening of the bag is performed only by blowing air, the opening operation cannot be performed reliably, and there is a risk that an error in loading the article may occur. Therefore, it is necessary to provide an opening detector to detect whether the bag is opened.

Conventional packaging equipment (Utility Model Publication No. 56-4370 and Japanese Patent Application Publication No.
Even if the technique of gripping the bag container 1 with a carrier (Japanese Patent Application Laid-Open No. 53-25195) is introduced to the device (No. 53-100079), the device becomes large and impractical.

"Means for Solving the Problems" The present invention involves transporting a belt-shaped bag consisting of a plurality of bags connected in the vertical direction by a predetermined amount and sending it to a heat sealing position, and In a packaging machine that heat-seals the opening of a bag after an article is loaded, a movable claw is fixed between a heater fixedly installed at the heat-sealing position and a pusher that presses the side of the bag opening against the heater. A pair of clamping claws are provided that clamp both sides of the bag by moving toward the claws, and when transporting the bag, the clamping claws open the movable claw and the fixed claw and hold the bag. A claw opening/closing mechanism is connected to the pusher to keep the bag in a closed state at least until the end of heat sealing, and the pusher is retracted from the front when the pusher is retracted, and protrudes from the front after contacting the heater to hold the bag. a cutter that separates the bag from the band-shaped bag; a pawl spacing control mechanism that causes both clamping claws to approach each other when the pusher moves backward and separates the clamping claws when the pusher moves forward; The bag is characterized in that it is connected with a gripping claw position control mechanism that brings the gripping claws close to the heater and brings the opening side of the bag into contact with the heater during movement.

"Function" When the clamping claws close, both ends of the bag in the width direction are securely held, and in this state, when the claw spacing control mechanism separates the claws, wrinkles, etc. at the top end of the bag are removed. It will be extended. After that, heat sealing is performed. Further, even if the bag is fused to the heat sealing part, it is forcibly peeled off from the heat sealing part by the clamping claw position adjustment mechanism. In this case, in one action of bringing the pusher closer to the heater, the gripping claws are moved apart to smooth out the wrinkles at the opening of the bag, the bag is brought closer to the heater together with the gripping claws, the opening is heat-sealed, and the cutter is moved closer to the heater. It is possible to perform an operation of separating the bag by twisting it.

``Example'' An example of this invention will be described below with reference to the drawings.

FIG. 5 is a perspective view showing the appearance of an embodiment of this invention.

In the figure, reference numeral 1 denotes the main body of the apparatus, which has a lid 2 that can be opened and closed at the top, and struts 3, 3 that extend upward at the rear. Grooves are cut in the opposing surfaces of the upper ends of the columns 3, 3, and a roller 4 around which a belt-shaped bag 8 (see FIG. 16) is wound is rotatably fitted into the groove. A hopper 5 for inserting articles is provided at the center of the front end surface of the lid body 2.
In the illustrated state, the bag 6 at the tip of the belt-shaped bag 8 pulled out from the roller 4 is located directly below the hopper 5 in an open state. Reference numeral 9 in the figure indicates a heater that is heated during heat sealing. Also,
The left and right ends of the upper end of the bag 6 are held by holding claws 7, 7, respectively.

Next, the configuration of each part of the device will be explained in detail.

(Configuration of conveyance mechanism for belt-shaped bag 8) FIG. 2 is a side sectional view of this embodiment, and FIG.
Portions corresponding to those in the figure are given the same reference numerals. As shown in FIG. 2, the above-mentioned belt-shaped bag 8 is pulled out from the roller 4 and then stretched over conveying rollers 10, 11, 12, and 13, and further,
It passes between the sliding plate 14 and the holding plate 15.
Then, the belt-shaped bag 8 that has passed between the sliding plate 14 and the presser plate 15 is moved to a movable roller 1 for adjusting the seal position.
After being stretched over the lower surface of the hopper 6 , it is sandwiched between a drive roller 18 and a driven roller 19 that rotates following the drive roller 18 , and reaches directly below the hopper 5 . In this case, the belt-shaped bag 8 is made up of a large number of bags 6 connected through perforations, and the bag 6 at the tip of the belt-shaped bag 8 is positioned directly under the hopper 5 in an open state as described above. are doing.

Further, 20 shown in FIG. 2 is a conveyance motor, and the rotation of this conveyance motor 20 is caused by the drive roller 1.
The rotation of the driving roller 18 is transmitted to the driven roller 19 by a gear having the same number of teeth, whereby the belt-shaped bag 8 is conveyed while being held. In this case, since the drive roller 18 and the driven roller 19 are interlocked by gears having the same number of teeth, their rotations are synchronized (rotation directions are mutually opposite directions), and as a result, the upper and lower surfaces of the belt-shaped bag 8 and are transported without shifting.

Also, a lever 21 on which the roller 11 is provided
The lever 21 is configured to be rotatable about a fulcrum 21a, and a rod 22 extending upward is connected to the right end of the lever 21 by a pin. And Rod 2
The upper end of the brake plate 23 is pin-coupled to the right end of the brake plate 23, and the left end of the brake plate 23 is pin-coupled to the fixed end. When the brake plate 23 rotates counterclockwise, it comes into pressure contact with the outer periphery of the roller 4, thereby applying a brake on the rotation of the roller 4. On the other hand, when the brake plate 23 rotates clockwise, it separates from the outer periphery of the roller 4. To do so, the brake is released.
That is, the above-mentioned components 11, 21, 22,
23 constitutes a brake mechanism 25, and when the belt-shaped bag 8 is conveyed, the roller 11 is pulled upward, whereby the lever 21 is rotated clockwise and the brake is released. In addition, belt-shaped bag 8
When the conveyance of the belt-shaped bag 8 is stopped, the tension of the belt-shaped bag 8 becomes weaker, and the roller 11 moves downward due to its own weight.
As a result, the brake plate 23 rotates counterclockwise to apply the brake. Then, when the conveyance of the belt-shaped bag 8 is stopped due to the operation of the brake mechanism 25, the roller 4 does not rotate due to inertia, and as a result, an unnecessary number of belt-shaped bags 8 are sent out from the roller 4 side. This situation is prevented.

(Sealing Position Control Mechanism) Now, the upper end of the bag 6 that has been transported to a predetermined position directly below the hopper 5 is heat-sealed after the articles are loaded, but the sealing position in this case needs to be accurately controlled. be. Therefore, this embodiment is provided with a seal position control mechanism, and this seal position control mechanism will be described below.

First, 30 shown in FIG. 2 is a limit switch attached to the upper surface of the presser plate 15.
An actuator 31 protruding toward the conveyance path side of the belt-shaped bag 8
It is equipped with 32 is a blower that sends air into the air duct 38, and 33 is a switching plate that switches the air passage of the blower 32. The switching plate 33 is the driven lever 3
4, it is configured to be freely rotatable about a shaft 35, and a driven lever 34 is pulled by a spring 36 so as to rotate clockwise.
As a result, in the illustrated state, the switching plate 33 closes the hole 38a provided on the lower surface of the air duct 38, and the air from the blower 32 is guided to the left end of the air duct 38 and blown out from the air outlet 38b. . On the other hand, the lower part of the driven lever 34 is engaged with the upper end of the drive lever 37, and when the drive lever 37 is rotated by a mechanism described later, the driven lever 34 is interlocked and rotated counterclockwise. As a result, the switching plate 33 rotates counterclockwise to cut off the left side and the right side inside the ventilation duct 38 (14th
(See Figure 15). As a result, the air from the blower 32 is blown out from the hole 38a and is blown onto the belt-shaped bag 8 located near the gap between the sliding plate 14 and the holding plate 15. In this case, the air blown from the air outlet 38b opens the upper end of the bag 6 being conveyed directly below the hopper 5, and the air blown from the hole 38a opens the upper end of the bag 6 being conveyed directly below the hopper 5. Open the top end and inflate. When the air is blown out from the hole 38a, the air blows into the bag 6, causing the bag 6 to swell and the height of the upper end surface to increase.As a result, the uppermost end and the lowermost end of the bag 6 are The height will differ depending on the swelling of the bag. Since the actuator 31 is in contact with the top surface of the bag 6 that is being transported, it moves up and down according to the height of this top surface. 31 suddenly falls as it touches the bottom end of the next bag. In this case, if the limit switch 30 is turned on when the actuator 31 is lifted and the limit switch 30 is turned off when the actuator 31 falls, the moment the limit switch 30 is turned off can be
It can be detected as a joint between the bags 6. As shown in FIG. 2, the length of the bag conveyance path from the detection position of the actuator 31 to the heater 9 can be adjusted by adjusting the vertical position of the movable roller 16. Therefore, by adjusting the movable roller 16, it is possible to change the part of the bag 6 that faces the heater 9 (i.e., the sealing position). The conveyance of the belt-shaped bag 8 may be stopped at a position where the part to be sealed faces the part to be sealed. In this case, pinions 16a having a common axis are provided at both ends of the movable roller 16, as shown in FIG.
is adapted to move by engaging with a rack 16b extending in the vertical direction. In addition, the movable roller 16
is fixed in position by tightening the fixing screw 16c shown in FIG.
By loosening 6c, it can be moved to any desired position. And the movable roller 16
Both ends protrude from the main body 1 through elongated holes, and near the elongated holes, as shown in FIG. S is attached. The above is the configuration of the seal position adjustment mechanism.

As described above, in this embodiment, the bag being transported is inflated by blowing air, and the seam of the bag is detected from the change in the degree of expansion, and the opposite side of the heater 9 at the time of seam detection is set to the sealing position. It is set as . In this case, in order to ensure that the bag can be opened by blowing air, the presser plate 15 is provided with a large number of holes 15a over its entire surface, as shown in FIG. The function of this hole 15a is as follows. That is, if wind enters between the presser plate 15 and the top surface of the bag 6, if there is no hole 15a, the wind with no escape will try to push down the top surface of the bag 6, causing the bag 6 to open. Otherwise, the upper end of the bag 6 may vibrate.
On the other hand, when there is a hole 15a, the wind that enters between the presser plate 15 and the top surface of the bag 6 escapes upward through the hole 15a, so it does not act to push down the top surface of the bag 6. As a result, the bag 6 can be opened easily. Next, FIG. 4 is a side view showing the state when the lid 2 is opened, and as shown in the figure, the lid 2 is opened.
On the side, there is a blower 32, a presser plate 15, and a driven lever 3.
4, a driven roller 19, etc. are provided.
In addition, a movable roller 16 provided on the main body 1 side
is positioned above the conveyance path of the bag 6 when moved to the highest position. The reason for this configuration is to facilitate the setting of the belt-shaped bag 8 by making it possible to separate the parts constituting the conveyance path vertically. That is, when setting the belt-shaped bag 8, open the lid 2, then set the movable roller 16 above the bag conveyance path, and in this state pull out the belt-shaped bag 8 from the roller 4 and pass through the movable roller 16. , furthermore, belt-shaped bag 8
The tip of the hopper 5 may be positioned below the hopper 5, and then the lid 2 may be closed. Then, when the lid body 2 is closed, the belt-shaped bag 8 is loaded into the conveyance path, thereby completing the setting. Therefore, the operation of inserting the belt-shaped bag 8 into a narrow conveyance path is not necessary, and the setting can be performed easily and quickly.

(Configuration of the holding claws 7 and their surrounding parts) Next, the holding claws 7 will be explained. Clamping claw 7
As shown in FIG. 2, it consists of a fixed claw 7a and a movable claw 7b provided on the fixed claw 7a so as to be movable in the horizontal direction in the drawing. In this case, since the movable claw 7b is pushed rightward in the drawing by the spring 40, if no external force is applied, the movable claw 7b will be in pressure contact with the fixed claw 7a, that is, the clamping claw 7
remains closed. Further, a roller 7c is provided on the lower surface of the movable claw 7b, and when the claw pushing plate 41 pushes the roller 7c to the left in the drawing, the movable claw 7b
b moves to the left against the elastic force of the spring 40,
The clamping claws 7 are in an open state. Here, FIG. 1 is a view taken along the line A-A shown in FIG.
It is slidably attached to the rail 42 by. Further, a pin 7d is provided on the lower surface of the fixed claw 7a, and one end of an L-shaped lever 45 is fitted onto this pin 7d. In this case, the lever 45 is provided symmetrically with respect to each of the fixed claws 7a, 7a (see FIG. 8). Also,
The lever 45 is configured to be rotatable around a shaft 45a, and is supported by a spring 45b provided between a pin protruding from the lower end surface and a fixed end 46.
The fixing claws 7a, 7a are biased to widen the distance between them. Further, the distance between the levers 45, 45 can be adjusted by turning a handle 130 shown in FIG. This mechanism will be explained below. First, 130 shown in Figure 8
a and 130b are threaded parts that are threaded in opposite directions, and these threaded parts 130a and 130b
Sleeves 131, 131 are screwed together. When the handle 130 is turned and the threaded portions 130a and 130b rotate, this sleeve 131
They are adapted to move in opposite directions along each threaded portion 130a, 130b. The levers 45 mentioned above are each rotatably attached to this sleeve 131, and the fixed end 46 is also attached to this sleeve. In this case, the fixed end 46 restricts the rotation limit of the lever 45,
As a result, the levers 45, 45 do not rotate beyond a predetermined angle with respect to the direction in which the gripping claws 7, 7 are spread apart.

Next, 48 moves lever 4 through roller 48a.
5, and when the arm 48 moves to the left in the drawing with the rail 42 fixed,
The lever 45 rotates against the elastic force of the spring 45b, and as a result, the fixed claws 7a, 7b (that is, the clamping claws 7, 7) move toward each other.

Here, FIG. 6 is an enlarged view of the vicinity of the lever 45, and parts corresponding to those in FIG. (showing lever 45 on the side).
Reference numerals 49 and 50 in this figure are stoppers for regulating the movement of the rail 42, and the stopper 49 is in contact with the left end surface of the rail 42, and the stopper 50 is a sleeve 4 provided at both ends of the rail 42.
It comes into contact with the right end surface of 2a. Further, the left end surface of the sleeve 42a is pressed by a pusher drive member 80, which will be described later, via a spring 51. On the other hand, when the arm 48 moves further to the left with the left end surface of the rail 42 in contact with the stopper 49, the lever 45 rotates against the elastic force of the spring 45b, and the gripping claws 7, 7 approaches each other.

(Configuration of pusher 55 and cutter 60) 55 shown in FIG. 1 is a pusher that moves to the heater 9 side during heat sealing and presses the sealed portion of the bag 6 against the heater 9, and 60 is a bag that performs heat sealing. This is a cutter that cuts the perforation at the top edge of the Below, these configurations and drive mechanisms will be explained.

First, reference numeral 65 shown in FIG. 1 is a motor that serves as a drive source for each part of the apparatus except for the transport mechanism.The driving force of this motor 65 is transmitted to the shaft 68 via gears 66 and 67, and the rotation of the shaft 68 is It is transmitted to gears 70, 70 via gears 69, 69 provided at both ends, and here, the vertical rotation of the motor 65 is converted into horizontal rotation by the respective gears. And gear 7
The rotation of 0.70 is applied to the cam plate 7 through the horizontal pivot shaft.
1 and 71, thereby causing the cam plate 71 to rotate horizontally. Also, the cam plate 7
1, rollers 72,
73 is provided eccentrically, and the roller 72 is
As shown in FIG. 2, the slide member 7 has a U-shaped cross section.
6 is fitted. In this case, a timing switch is appropriately provided around the horizontal pivot shaft to which the cam plate 71 is attached.
1 reaches a predetermined angle of rotation, a detection signal is output (the detection timing will be described later). The reason why the timing switch is provided is that the rotation angle of the cam plate 71 corresponds to the state of each part of the device.

The sliding member 76 is attached to a sliding sleeve 77, and the sliding sleeve 77 is surrounded by a horizontally extending cylindrical rod 78. In this case, the two symmetrically provided cam plates 71 rotate synchronously in opposite directions, so that when the motor 65 rotates, the slide member 76 moves along the rod 78. Translate horizontally in the drawing. The arms 48, 48 described above are provided on the left end surface of the slide member 76, and both ends of the upper end surface of the slide member 76 and both ends of the upper end surface of the pusher drive member 80 are parallel to the rod 78. They are connected by connecting plates 81, 81. Therefore, the pusher drive member 8
0 moves in parallel with the slide member 76.

This pusher drive member 80 is encased around the rod 78 by sleeves provided at both ends.
3 is slidably mounted on the ring. This rod 83
A pusher 55 is attached to the right end portion of the pusher 55, so that the pusher 55 is slidable in the left-right direction in the drawing. A spring 84 is interposed between a predetermined position of the rod 83 and the left end wall of the pusher drive member 80, and as a result, the pusher 55 is pushed to the right to its limit of movement. In addition, a flat arm attachment portion 9 is provided at the center of the left end of the pusher 55.
1 is provided, and this arm attachment portion 91 is provided with an arm 9.
One end of 3,93 is pin-coupled. Arm 93,
The central portion of 93 is penetrated by pins 92, 92 extending downward from the pusher drive member 80, and is rotatable around the pins 92, 92. At both ends of the cutter 60, links 94,
One end of the link 94 is connected with a pin, and the other ends of the links 94, 94 and the other ends of the arms 93, 93 are connected with a pin, respectively. Further, at both ends of the cutter 60, long holes 60a, 60a extending in the moving direction of the pusher 55 are provided.
is provided, and the cutter 60 is inserted into this elongated hole 60.
It is slidably attached to the upper surface of the pusher 55 by flat screws 90, 90 passing through holes a and 60a. In the state shown in this figure, the pusher 55
is being pushed to the right, so arm 9
3 and 93 rotate to pull the cutter 60 to the left in the drawing, and as a result, the right end of the cutter 60 does not protrude from the right end surface of the pusher 55.

In the present invention, a pawl spacing control mechanism for moving the gripping pawls 7, 7 closer to each other and a pawl spacing control mechanism for moving the gripping pawls 7, 7 closer to each other;
In one embodiment, the clamping claw position control mechanism for moving the holder away from and approaching the heater 9 includes the rail 42, the lever 45, the arm 48, the slide member 76, and the roller 7.
2. It is constructed by combining a cam plate 71, a motor 65, etc., and the slide member 7 is connected via the cam plate 71.
6, the lever 45 is rotated and the clamping claws 7, 7 are moved along the rail 42, and the rail 42 is moved between the stoppers 49, 50.
It is possible to perform an operation of moving the heater 9 back and forth between the two to move it away from and approach the heater 9. Since the pusher 55 and the cam plate 71 are in a connected state as described above, the holding claws 7, 7 are interlocked with each other as the pusher 55 moves.

(Opening and Closing Mechanism for Clamping Claws 7, 7) Reference numeral 95 shown in FIG. 2 is a rod that slidably passes through the fixing member 98. The right end surface of 95 is joined to the left end surface of drive plate 96. Further, a spring 97 is interposed in the rod 95 between the left end surface of the driving plate 96 and the right end surface of the fixing member 98. As a result, the claw pushing plate 41 and the rod 95
5 and the drive plate 96 are pulled to the right in the drawing. The roller 73 described above is driven by a drive plate 96.
roller 7.
3 pushes the drive plate 96 to the left, the rod 95 and the claw pusher plate 41 move to the left against the elastic force of the spring 97, and as a result, the claw pusher plate 41 moves as described above. pushes the roller 7c to move the rail 42 to the left, and the sleeve 42a pushes the stopper 4.
9 and is further pushed to the left to open the gripping claws 7.

(Movable guide plate 100 and its driving mechanism) Next, 100 shown in FIG.
This is a movable guide plate that guides the gripping claws 7, 7, and is configured to be movable diagonally downward and to the left by a parallel link mechanism 101 (see FIGS. 14 and 15). Further, the parallel link mechanism 101 is connected to the rod 1
The rod 102 is pin-coupled to one end of the rod 102.
Two springs 103 and 104 are interposed at the other end. The springs 103 and 104 are fixed at their left and right ends, respectively, and the springs 103 and 104 are
An L-shaped member 105 is slidably provided between 3 and 104. The lower part of the L-shaped member 105 is attached to a sliding member 106 having a U-shaped cross section, and this sliding member 106 is connected to the upper end surface of the claw drive plate 96 by a rod 107 and an L-shaped fitting 108. (See Figure 1). In this case, both ends of the sliding member 106 are slidably fitted to the rod 78 via sleeves.

According to the above-described configuration, the movement of the drive plate 96 is transmitted to the sliding member 106, and the movement of the driving plate 96 is transmitted to the sliding member 106.
The movement of the rod 10 is caused by the springs 103 and 104.
2 and the parallel link mechanism 101, thereby driving the movable guide plate 100. Also,
A fixed guide plate 120 is provided above the movable guide plate 100 to guide the belt-shaped bag 8 transferred from the drive roller 18 to the movable guide plate 100. In this case, the inclination of the fixed guide plate 120 and the movable guide plate 10
The angle is the same as the slope of 0, and when the movable guide plate 100 descends, the movable guide plate 100 and the fixed guide plate 120 are linearly on the same plane, and the upper end of the movable guide plate 100 is the fixed guide plate 12
0 near the lower end of the belt-shaped bag 8.
The structure is designed to ensure reliable transportation.

(Drive mechanism of drive lever 37) Next, the drive lever 37 shown in FIG. connected to the section. The right end of the horizontal arm 111 is joined to the right end of the sliding member 106, as shown in FIG.
The drive lever 37 is adapted to rotate in conjunction with the movement of the sliding member 106.

(Operation of Example) Next, the operation of this example with the above-described configuration will be described.

(1) First, the empty feeding operation for conveying the bag 6 at the tip of the belt-shaped bag 8 to a predetermined position will be explained with reference to FIGS. 7 to 15. Note that during empty feeding, the bags 6 shown in FIGS. 7 to 15 have not yet been loaded.

First, in the initial state, each part of the device is in the state shown in FIGS. 7 and 8 (as shown in FIGS.
1), and in this state, the operator opens the lid 2 and sets the belt-shaped bag 8 as shown in FIG. When setting the belt-shaped bag 8, after passing its tip through the conveying rollers 10 and 11, the movable roller 16
, and then hang it on the left end surface of the movable guide plate 100. In this case, the movable roller 16 is
Before loading the belt-shaped bag 8, the bag 8 is positioned upward, and after loading the belt-shaped bag 8, the position is adjusted according to the length of the bag 6 while referring to the scale S mentioned above. Next, when the lid 2 is closed and the power switch is turned on, the blower 32 starts blowing air. In this case, as shown in FIG.
Since the air outlet 38b is closed, the air from the blower 32 is blown out from the air outlet 38b. Further, this initial state is detected by the timing switch mentioned above.

Next, when the start switch ST is pressed, only the motor 65 starts rotating in this initial state. When the motor 65 rotates, the cam plate 71
rotates, thereby moving the slide member 76 and the slide member 106 to the right in the drawing. and,
When the slide member 76 moves to the right, the pusher 55 starts to move toward the heater 9 as shown in FIG. 9, and the arm 48 moves to the right and the lever 4
5 rotates in a direction to separate the gripping claws 7, 7.
Both ends of the pusher drive member 80 push the sleeve 42a (see FIG. 6) via the spring 51, thereby moving the sleeve 42a to the right until it abuts against the stopper 50. That is, the rail 42 and the clamping claws 7, 7 are close to the heater 9 (the 11th
(see figure). Next, the pusher 55 comes into contact with the heater 9, and when the pusher driving member 80 further moves toward the heater 9 from this state, the cutter 60 provided on the upper surface of the pusher 55 protrudes to the right. In this state, the timing switch is activated, and the motor 65 is stopped by the output signal of this timing switch. Next, a first timer (not shown) starts operating, and current is supplied to the heater 9 while the first timer is operating. Then, when the first timer finishes timing, the second timer starts timing, and the second timer starts timing.
When the timing operation of the timer ends, the motor 6 is turned on again.
5 is driven, and the cam plate 71 starts rotating. In this case, the first timer controls the energization time, and the second
The timer controls the cooling time of the heat seal section. When the motor 65 is driven again, the slide member 76, the sliding member 106, and the pusher 55 are moved again.
As shown in FIG. 13, as the drive plate 96 starts to move leftward in the drawing, it is pushed by the roller 73 and starts moving leftward, thereby causing the claw pushing plate 41 to touch the lower surface of the movable claw 7b. It comes into contact with the provided roller 7c. Then, when the claw pushing plate 41 moves further to the left, the roller 7c is pushed to the left. At this time,
Since the pusher 55 has moved to the left, it is released from the bias of the spring 51, and as a result, the clamping claws 7, 7 and the rail 42 move to the left and separate from the heater 9. During the above operation, the movement of the sliding member 106 is absorbed by the springs 103 and 104, so the movable guide plate 100 remains stationary.

Next, as shown in FIG. 14, the slide member 7
6 further moves to the left, and the pusher 55 moves away from the heater 9. Further, the sleeves 42a provided at both ends of the rail 42 come into contact with the stopper 49 shown in FIG. 6, and the movement of the clamping claws 7 and the rail 42 is stopped. When the movable claw 7b moves toward the spring 40, the movable claw 7b
moves to the left against the elastic force of
The clamping claws 7, 7 are in an open state. In addition, the sliding member 1
06 moves to the left, and this movement of the sliding member 106 is transmitted to the rod 102 and the parallel link mechanism 101 via the springs 103 and 104, thereby moving the movable guide plate 100 to the lower left (toward the front side of the device). Move to. Furthermore, when the sliding member 106 moves to the left, the horizontal arm 111 moves to the left, and this movement is transmitted to the drive lever 37 by the spring 110, thereby causing the drive lever 37 to rotate clockwise. do. As a result, the driven lever 34 rotates counterclockwise against the elastic force of the spring 36, and as a result,
The switching plate 33 rotates counterclockwise to separate the inside of the duct 38 into right and left sides. Therefore, the air from the blower 32 is blown out from the hole 38a and onto the upper surface of the belt-shaped bag 8.

Then, the timing at which the gripping claw 7 becomes open is detected by the timing switch, and based on this detection signal, the rotation of the motor 20 is started and the motor 65 is stopped. Then, when the motor 20 rotates, the conveyance of the belt-shaped bag 8 is started, and the bag 6 on the sliding plate 14 is inflated by the wind, and the actuator 3 of the limit switch 30 is activated.
1 rises. When the conveyance of the belt-shaped bag 8 is started,
The tip of the band-shaped bag 8 moves downward along the movable guide plate 100, and thereby enters into the gripping claws 7, 7 which are already in an open state.

Next, when the belt-shaped bag 8 is further conveyed, the 15th
As shown in the figure, the border (perforation) of the bag reaches the contact position of the actuator 31, and as a result,
The actuator 31 rotates counterclockwise and the limit switch 30 is turned off. When the limit switch 30 is turned off, the motor 2
0 stops, the conveyance of the belt-shaped bag 8 is stopped, and
Motor 65 is rotated again. In this case, since the movable roller 16 has been adjusted to a predetermined position, the heat-sealed portion of the bag 6 (usually near the perforation) is positioned to the left of the heater 9.

Further, as the rotation of the cam plate 71 progresses, the pawl pushing plate 41
and the sliding member 106 each start moving to the right, and the sliding member 76 further starts moving to the left. When the claw pushing plate 41 moves to the right, the movable claw 7b moves to the right due to the elastic force of the spring 40, whereby both ends of the upper end of the bag 6 are clamped by the clamping claws 7, 7. be done.

Then, the sliding member 106 moves to the right, thereby the rod 102 and the horizontal arm 111 move to the right, the movable guide plate 100 rises, and the switching plate 33 returns to the initial position shown in FIG. Return. Therefore, the air from the blower 32 is blown out from the air outlet 38b. At this time, spring 1
04 causes a momentary delay in the movement of the movable guide plate 100. Because of this configuration, the movable guide plate 100 rises after the gripping claws 7, 7 securely grip the bag 6.
Even if air is blown from the air outlet 38b, the bag 6 will not escape from between the fixed claw 7a and the movable claw 7b, and the clamping operation will be ensured. Furthermore, the slide member 76 has moved to the left after the state shown in FIG. 13, and as a result, the arm 48 (see FIG. 1)
moves to the left and rotates the lever 45, whereby the gripping claws 7, 7 approach each other and open the upper end of the bag 6, as shown in FIG. In this case, since the air is blown from the air outlet 38a as described above, the opening operation of the bag 6 becomes more reliable. And, as you can see from the above,
In this embodiment, after the state shown in FIG. 15, the initial state shown in FIG. 7 occurs. Then, this initial state is detected by the timing switch and the motor 65 is stopped.

Further, as the rotation of the cam plate 71 progresses, the claw pushing plate 4
1. The slide member 76 and the slide member 106 each start moving to the right. When the claw pushing plate 41 moves to the right, the movable claw 7b moves to the right due to the elastic force of the spring 40, whereby both ends of the upper end of the bag 6 are clamped by the clamping claws 7, 7. Ru.

Next, when the cam plate 71 further rotates, the sliding member 106 moves to the right, which causes the rod 1
02 and the horizontal arm 111 move to the right, and the movable guide plate 100 and the drive lever 37 each return to their initial positions shown in FIG. Therefore, the blower 32
Air is blown out from the air outlet 38b. Furthermore, the slide member 76 has moved to the right after the state shown in FIG. 13, and as a result, the arm 4
8 (see FIG. 1) moves to the right and rotates the lever 45, whereby the gripping claws 7, 7 approach each other and open the upper end of the bag 6 as shown in FIG. let

(2) Next, the sealing operation will be explained.

The movements of each part of the apparatus in the sealing operation and the above-mentioned empty feeding operation are exactly the same. That is, each time the start button is pressed, the above-described operation is repeated. However, since the bags 6 are sequentially conveyed to the sealing position, heat sealing and perforation cutting operations are performed. This operation will be explained below.

First, in the initial position shown in FIG. 7, the bag 6 conveyed by the above-described empty feeding operation is open, and each part of the apparatus is stationary in this state. Here, the operator inserts the article from the hopper 5 and puts the article into the bag 6. Then, when the start button is pressed, the pusher 55 and the slide member 76 start moving to the right. When the slide member 76 moves to the right, the arm 48 moves to the right, and as a result, the lever 45 is rotated by the elastic force of the spring 45b, and the gripping claws 7, 7 move in a direction in which they are separated from each other. . Therefore, the upper end of the bag 6 is pulled in the width direction to close it, and since the upper end is stretched in a straight line, wrinkles and the like in this area are smoothed out (see FIG. 10).

Next, when the slide member 76 further moves to the right, the rail 42 moves to the right due to the elastic force of the spring 51 (see FIG. 6), which causes the clamping claws 7, 7 to move toward the heater 9. The upper end (sealed portion) of the bag 6 comes into contact with the heater 9. When the pusher 55 further moves to the right, the cutter 60 provided on the upper surface of the pusher 55 projects to the right, thereby cutting the perforation at the seam of the bag (see FIG. 12). and,
In this state, the heater 9 is energized, thereby thermally sealing the upper end portion of the bag 6.

Next, when the claw pushing plate 41 pushes the ring 7c provided on the lower surface of the movable claw 7b to the left, the clamping claw 7,
7 and rail 42 move leftward and away from heater 9, and the sealed portion of bag 6 is torn off from heater 9. In this case, during heat sealing,
Even if the bag 6 is fused to the heater 9, the bag 6 is forcibly peeled off from the heater 9 by the above-mentioned separation operation of the clamping claws 7, 7 (see FIG. 13).

Next, when the cam plate 71 further rotates, the first
As shown in FIG. 4, the clamping claws 7 are opened, and the bag 6 after heat sealing falls downward, and the bag 6 to be sealed next is guided by the movable guide plate 100 and placed inside the clamping claws 7. transported. Next, when the cam plate 71 further rotates, the claw pressing plate 41 is driven to the right as shown in FIG. 15, thereby closing the clamping claws 7 and clamping the bag 6. Then, when the slide member 76 is further driven to the left, the bag 6
The gripping claws 7, 7 approach each other while holding the
It returns to the initial position shown in FIG. 7 again, and the above operations are repeated thereafter.

In this embodiment, when the handle 130 is turned in accordance with the width of the belt-shaped bag 8 and the interval between the gripping claws 7 is adjusted, the lever 45 is also moved at the same time as described above. And lever 4
5, the position at which the arm 48 presses the lever 45 changes, and therefore the amount by which the gripping claws 7, 7 approach each other changes. In the case of this embodiment, for a bag with a narrow width, the amount of the gripping claws 7, 7 that come close to each other increases, thereby increasing the bulge of the bag and making it extremely easy to carry out the article loading operation. .

In addition, in this embodiment, since the clamping claws 7, 7 move toward and away from the heater 9, even if the bag is fused to the heater surface after sealing, the bag can be forcibly pulled away, and there is an advantage that the opening of the bag is not hindered by the heater 9.

Furthermore, since the movable guide plate 100 moves toward the front of the device when transporting bags, the bags can be transported accurately.
In addition, since the movable guide plate 100 is returned to the rear of the device when opening the bag, filling articles, and heat sealing, it does not interfere with each of the above operations.

Furthermore, in this embodiment, the following modifications are possible.

A counting scale is placed on the top of the device, and the articles to be input are counted by this counting scale.

A bag-making machine that continuously manufactures bags of a predetermined size from a cylindrical sheet is installed at the top of the device, and the bags are transported from this bag-making machine.

An automatic counting and filling machine that counts a predetermined amount of articles and automatically puts in the counted articles is provided, and the articles are loaded by this machine. In this case, in order to make the operation more reliable, an opening sensor may be provided to detect the opening of the bag.

In the above embodiment, the gripping claws 7, 7, etc. are driven mechanically, but instead of this, they may be driven electrically using, for example, a solenoid.

Further, in the above embodiment, the gripping claws 7, 7
Although the gripping claws are configured to grip both ends of the upper end of the bag 6, the shape of the gripping claws in the height direction may be made longer so that both ends of the bag are gripped widely from the upper end to the lower end. In this way, when the clamping claws are separated, the bag is pulled in the width direction from the top end to the bottom end, so the air inside the bag is exhausted, and the bag after heat sealing is inflated by the internal air. This situation is prevented.

Furthermore, when the gripping claws 7, 7 are brought close to each other, if the claws are driven so as to shift the front and rear surfaces of the bag in the width direction, the amount corresponding to the amount of shift escapes to the center of the upper end of the bag. The center part swells, making the opening operation more reliable.

"Effects of the Invention" As explained above, according to this invention, the bag can be opened reliably and the article insertion operation can be performed reliably. In addition, since both ends of the bag are pulled in the width direction immediately before heat sealing, wrinkles in the heat seal area are smoothed out, ensuring reliable heat sealing and creating a beautiful finish. . Furthermore, when the respective clamping claws are closed, both ends of the bag in the width direction are securely held regardless of the shape and amount of the contents. Further, even if the bag is fused to the heat sealing part, it is forcibly peeled off from the heat sealing part by the gripping claw position control mechanism.

A cutter, a pawl spacing control mechanism, and a clamping pawl position control mechanism are provided so as to be linked to the pusher that presses the side of the bag opening against the fixed heater, allowing the operator to smooth out the wrinkles at the bag opening and move the bag to the heater. The approximation operation, the operation of heat sealing the opening, and the operation of separating the bag from the heater can be performed in one movement of the pusher approaching the heater;
In addition to being efficient, a part of each mechanism can be shared, contributing to miniaturization of the device provided with the clamping claws.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view showing the structure of an embodiment of this invention, Fig. 2 is a side sectional view of the embodiment, Fig. 3 is a partially cutaway plan view of the embodiment, and Fig. 4 is a lid body. 5 is a perspective view showing the structure of the same embodiment, FIG. 6 is a plan view showing the structure around the holding claw 7, and FIGS. 7, 9, and 11. 15 are side sectional views for explaining the operation of the same embodiment, FIGS. 8 and 10 are plan sectional views corresponding to the states shown in FIGS. 7 and 9, respectively, and FIG. 16 is a side sectional view for explaining the operation of the same embodiment. FIG. 2 is a perspective view showing the configuration of a belt-shaped bag 8. FIG. 7a... fixed claw, 7b... movable claw, 7... clamping claw, 9... heater, 42... rail, 40... spring, 41... claw pushing plate, 45... lever, 48......
Arm, 51... Spring, 55... Pressure, 65...
...Motor, 71...Cam plate, 72...Roller, 7
6...Slide member.

Claims (1)

[Scope of utility model registration request] A packaging machine that transports a predetermined amount of a belt-shaped bag consisting of a plurality of bags connected in the vertical direction and sends it to a heat sealing position, and heat seals the opening of the bag sent to the heat sealing position after inserting an article. , between the heater fixedly installed at the heat-sealing position and the pusher that presses the side of the opening of the bag against the heater, both sides of the bag are moved by moving a movable claw toward the fixed claw. A pair of clamping claws are provided to clamp the bag, and these clamping claws have a movable claw and a fixed claw that are in an open state when the bag is being transported, and the bag is held in a closed state at least until after the heat sealing is completed. A claw opening/closing mechanism is connected to the pusher, and the pusher has a cutter that is retracted from the front when the pusher is retracted and is projected from the front after contacting the heater to cut the bag from the strip bag, and a cutter that cuts the bag from the strip bag when the pusher moves backward. A pawl spacing control mechanism that brings the clamping claws close to each other and separates the clamping claws when the pusher moves forward, and separates both clamping claws from the heater when the pusher moves backward, and moves the clamping claws close to the heater during the forward movement to open the bag. A packaging machine characterized in that it is connected to a gripping claw position control mechanism that brings the side surface into contact with a heater.