JP5610385B2 - End seal device and automatic packaging machine equipped with the end seal device - Google Patents

Description

  The present invention relates to an end seal device for heat-sealing a strip-shaped packaging film formed in a cylindrical shape in the film width direction and an automatic packaging machine including the end seal device.

  A conventional end seal device includes a pair of sealers that are vertically opposed to each other with a packaging film interposed therebetween, and these sealers are respectively fixed to a pair of upper and lower sealer mounts and maintain a state in which the seal surfaces face each other. Heat seal while revolving. At the time of sealing, the packaging film is sandwiched between the sealing surfaces of the upper and lower sealers and heat-sealed, and the cutter disposed on one sealer is unrolled and cut to form a pillow package that is heat-sealed at both ends in the film transport direction. (First conventional example). The seal surface of the upper and lower sealers is divided into the front and rear in the film transport direction, the front seal surface provides the rear end seal of the front packaging body, and the rear seal surface serves as the front end of the rear packaging body. Sealing is performed, and the gap between both end seals is cut by a cutter.

  Also, one of the upper and lower sealers is divided into two in the front and rear direction in the direction of travel of the packaging film. An attached end seal device is known (see, for example, Patent Document 1). According to this end seal device, it is possible to appropriately select whether the package is to be completely sealed or open on one side depending on whether or not the sealer dividing portion that can be raised and lowered is raised (second conventional example). ).

Utility Model Registration No. 2600077

  However, in the above end seal device, it may take time to adjust the seal pressure on the front and rear seal surfaces. In other words, two heat insulating plates are arranged between the sealer and the sealer mounting base in the front and rear of the film conveying direction. If the thickness of these heat insulating plates is different, in the end seal device of the first conventional example, Since the sealer is inclined, the seal pressure on the front and rear seal surfaces cannot be adjusted to an appropriate pressure, and it is necessary to perform parts replacement and machining for equalizing the thickness. On the other hand, in the end seal device of the second conventional example, one sealer dividing portion is fixed to the sealer mounting base and the upper limit of the other sealer dividing portion is determined. , It takes time and effort to align the thickness.

  In order to solve the above problems, an object of the present invention is to provide an end seal device that can easily adjust the seal pressure and an automatic packaging machine that includes the end seal device.

In order to solve the above-mentioned problems, the invention of claim 1 is directed to an end seal device in which a bag-shaped packaging film is sandwiched between a pair of sealers and heat-sealed in the film width direction, wherein each sealer is attached to a pair of sealers. A front sealer splitting part and a rear sealer splitting part which are respectively attached to the base and are arranged with a gap in the front and rear of the packaging film in the transport direction, wherein one sealer includes the front sealer splitting part and the rear sealer A cutting cutter is disposed between the split part so as to be able to enter and exit, and at least one of the sealers is provided with the front sealer split part and the rear sealer split part separately, and these are separate actuators. It is attached to the sealer mount displaceably in cooperative to the other of the sealer and opposite direction to, the front sealer Split unit, after engagement of the rear sealer division unit each other, the cutter is fed to cutting the packaging film, the front of the package is characterized in that the meshes after being pressed by the air bleed means. As the actuator, a ball screw, an air cylinder, a rack and pinion, an air bag or the like can be used, and any of manual and automatic may be used.

  According to the first aspect of the present invention, heat sealing is performed by sandwiching the packaging film conveyed in the horizontal direction from above and below, or heat sealing by sandwiching the film conveyed in the vertical direction from the side. It is also possible. Further, when one of the displaceable front sealer division part and the rear sealer division part is retracted to a position where it does not mesh with the other sealer, a one-side open packaging body in which one of the end seals is opened can be obtained. it can.

  The invention of claim 2 is characterized in that the actuator is a fluid pressure cylinder.

  The invention of claim 3 is characterized in that the fluid pressure cylinder is an air cylinder.

A fourth aspect of the invention is characterized by comprising the end seal device according to any one of the first to third aspects .

  Since the end seal device and the automatic packaging machine according to the present invention can control the front and rear sealer dividing portions independently, not only can the seal pressure adjustment work be performed efficiently, but also some manufacturing errors can be handled. It is possible to provide an automatic packaging machine with excellent convenience.

Schematic which shows the automatic packaging machine of this invention. The perspective view which shows the end seal apparatus of this invention. The side view partial enlarged view of the sealer vicinity. The side view partial enlarged view of the sealer vicinity which shows a meshing state. The side view partial enlarged view of the sealer vicinity which shows the state which displaced the front-back sealer division part to the sealer mounting base side. The side view partial enlarged view of the sealer vicinity which shows the state which displaced the front sealer division | segmentation part to the sealer mounting base side. The side view partial enlarged view of the sealer vicinity which shows another embodiment. It is explanatory drawing which shows operation | movement of the sealer at the time of an end seal, Comprising: (a) Seal by a rear sealer division part, (b) Cutting and air bleeding by a cutter, (c) Seal by a front sealer division part.

  Hereinafter, embodiments of the end seal device of the present invention and an automatic packaging machine including the end seal device will be described. FIG. 1 is a schematic view of a horizontal pillow type automatic packaging machine, FIG. 2 is a schematic perspective view of an end seal device, FIGS. 3 to 7 are partial enlarged views of a sealer portion viewed from the side, and FIG. These are explanatory drawings showing the end seal by the end seal device according to the present invention over time.

  As shown in FIG. 1, the automatic packaging machine 1 has a cylindrical shape in which a supply unit 3 on which a roll 2 of packaging film F is set and both side edges of the packaging film F fed from the supply unit 3 are overlapped. A bag making device 4, a center seal portion 5 for heat-sealing the overlapping portion of the packaging film F on the downstream side of the bag making device 4, and a packaging film F formed in a cylindrical shape on the downstream side of the center seal portion 5. And an end seal device 100 that performs heat sealing in the film width direction and performs cutting.

  A finger conveyor 6 is disposed on the upstream side of the automatic packaging machine 1, and the articles A to be packaged are supplied at a predetermined pitch into the packaging film F that has passed through the bag making machine 4 and is formed into a cylindrical shape. Then, after the overlapping portion is heat-sealed in the center seal portion 5, the end seal device 1 is heat-sealed and cut in the film width direction to form the pillow package 7 containing the article. Reference numerals 8 and 9 indicate belt conveyors, and reference numeral 10 indicates a presser belt.

  As shown in FIG. 2, the end seal device 100 of the automatic packaging machine 1 includes a pair of upper and lower sealers 101 and 102, and each of the sealers 101 and 102 is attached to a pair of sealer mounting bases 103 and 104 arranged vertically. It has been.

  Each of the sealer mounts 103 and 104 has a length in the film width direction (the direction of the arrow X in the figure), and both ends in the longitudinal direction are rotatably supported by the rotation shafts 105 and 106. The rotating shafts 105 and 106 are supported by rotating plates 107 and 108 that are provided in a pair on both sides of the sealer mounting bases 103 and 104.

  The rotating plates 107 and 108 are arranged in pairs on both sides on the inner surface of the pair of cam plates 109 and 110 arranged in parallel in the X arrow direction, and two sets are arranged vertically for the upper and lower sealer mounts. Reference numerals 107 and 108 are attached to one end portions of drive shafts 111 and 112 provided through the cam plates 109 and 110, respectively. Further, the rotary plates 107 and 108 are formed with notches 113 and 114 radially outward from the center, and bearing portions 115 and 116 are provided which are slidable in the radial direction within the notches. The rotating shafts 105 and 106 are supported by the portions 115 and 116 in a state in which the tip portions are penetrated. A cam follower (not shown) is externally fitted to the tip of the rotary shafts 105 and 106, and the cam follower is inside a horizontally long oval cam groove (not shown) formed on the inner surface of the cam plates 109 and 110. It is provided so that it may slide along.

  On the other hand, driven gears 117 and 118 having the same number of teeth are fixed to the other ends of the drive shafts 111 and 112 so that the driven gears 117 and 118 of the drive shafts 111 and 112 positioned above and below are engaged with each other. It has become. Further, the drive gear 120 is fixed to both ends of the input shaft 119 provided so as to penetrate the lower ends of both cam plates 109 and 110, and the input gear 121 is fixed to one end of the input shaft 119, Each drive gear 120 meshes with the left and right lower driven gear 118.

  In the end seal device 100, when the input gear 121 is driven by an electric motor or the like (not shown), the input shaft 119 rotates and at the same time both the drive gears 120 rotate. When these drive gears 120 are rotated, power is transmitted to both the lower driven gears 118 engaged with the drive gears 120, and the upper driven gear 117 is rotated accordingly. As a result, the rotating plates 107 and 108 rotate, and the upper and lower sealer mounts 103 and 104 revolve around the drive shafts 111 and 112, respectively. The upper and lower sealer mounting bases 111 and 112 are connected by a guide bar (not shown) provided vertically and are slidable with respect to the guide bar, so that the sealers 101 and 102 face each other. Revolve while maintaining. Further, in the section where the heat sealing is performed, it moves linearly in the film conveying direction, and the time for holding the packaging film F between the upper and lower sealers 101, 102, that is, the time for heat sealing can be increased to some extent. The bearing portions 115 and 116 of the rotary plates 107 and 108 move together with the rotary plates 107 and 108 while changing their positions in the radial direction because the cam followers of the rotary shafts 111 and 112 move along the guide grooves of the cam plates 109 and 110. Rotate.

  Next, the sealer of the end seal device 100 will be described with reference to FIGS. The sealers 101 and 102 of the respective sealer mounts 103 and 104 are divided into two parts in the front and rear direction in the film traveling direction (Y arrow direction), and a certain distance is provided between the front sealer divided part and the rear sealer divided part. A gap is provided. The front and rear sealer dividing portions 102a and 102b attached to the lower sealer mounting base 104 are respectively fixed to separate holders 140a and 140b with heat insulating plates 133a and 133b interposed therebetween, and the holders 140a and 140b are springs. 141a and 141b are connected to the sealer mounting base 104.

  The front and rear sealer dividing portions 101a and 101b of the upper sealer mounting base 103 are also provided separately and have independent structures. A cutting cutter 132 is disposed in the gap between the front and rear sealer dividing portions 101a and 101b so as to penetrate the sealer mounting base 103, and the packaging film F is cut appropriately by being fed out by an air cylinder (not shown). The front and rear sealer dividing portions 101a and 101b of the upper sealer mount 103 are displaceable in a direction facing the lower sealer 102, and details thereof will be described next.

  Mounting holes 103a and 103b penetrating in the vertical direction are formed in the sealer mounting base 103 at two front and rear positions, and ball screw nuts 122 and 123 are fitted into these mounting holes 103a and 103b, respectively. Each of the ball screw nuts 122 and 123 is supported in a mounting hole by a bearing (not shown) and is rotatable about a longitudinal axis. In addition, gears 124 and 125 are externally fitted to the upper end portions of the ball screw nuts 122 and 123, and these gears 124 and 125 are output shafts of motors 126 and 127 respectively disposed before and after the sealer mounting base 103. Driven by drive gears 128 and 129 fixed to 126a and 127a.

  Ball screws 130 and 131 are screwed into the ball screw nuts 122 and 123, and the lower ends thereof are connected to the front sealer divided portion 101a or the rear sealer divided portion 101b. Therefore, when the ball screw nuts 122 and 123 are rotated by the motors 126 and 127, the ball screws 122 and 123 are moved up and down, and the front sealer divided portion 101a and the rear sealer divided portion 101b are displaced in a direction facing the lower sealer 102. Can do. Since each of the motors 126 and 127 can be controlled individually, the positions of the front sealer dividing unit 101a and the rear sealer dividing unit 101b can be adjusted independently.

  As a result, when the upper sealer 101 and the lower sealer 102 are engaged with each other, the seal pressure of one or both of the front sealer divided portions 101a and 102a and the rear sealer divided portions 101b and 102b is not appropriate. The seal pressure can be adjusted by driving the motors 126 and 127 to displace the front and rear sealer dividing portions 101a and 101b. For example, when the seal pressure of the front sealer dividing portions 101a and 102a is insufficient, the spring 141a is more compressed as shown in FIG. 4 if the front sealer dividing portion 101a is displaced downward to perform sealing. The seal pressure increases because of the state. Conversely, when an excessive seal pressure is applied, the seal pressure can be lowered to an appropriate pressure by displacing upward and reducing the compression amount of the spring 141a. If the sealing pressure is excessive, the film may be crushed and cut off. If the sealing pressure is insufficient, the seal will not be formed normally, resulting in poor sealing.

  As shown in FIG. 4, when the levels of the sealing surfaces of the front sealer divided portions 101a and 102a and the rear sealer divided portions 101b and 102b are different, the packaging film F is slightly pulled, so that the cutter 132 Can be cut reliably.

  As shown in FIG. 5, by moving the front sealer dividing portion 101a and the rear sealer dividing portion 101b back toward the sealer mounting base, the upper and lower sealers 101 and 102 can be separated from each other so as not to be engaged with each other. As a result, when the position of the product is detected in the past, the sealer is stopped to prevent biting. However, the packaging film F can be passed through without stopping the sealer. Can be reduced.

  Furthermore, as shown in FIG. 6, if only one of the front sealer dividing portion 101a and the rear sealer dividing portion 101b is moved backward to the sealer mounting base side so as not to be heat-sealed, one is opened. A pillow package can be formed. In addition, during heat sealing, one of the front sealer dividing portion 101a and the rear sealer dividing portion 101b is retracted toward the sealer mounting base to shorten the sealing time, so that one of the end seals of the package has weak sealing strength. A package having an end seal that can be easily opened can be formed. Also, if one of the ends is a narrow end seal, film burn can be prevented by shortening the sealing time.

  As described above, since the seal pressures of the front sealer divided portions 101a and 102a and the rear sealer divided portions 101b and 102b can be independently adjusted, conventionally, the width of the front and rear end seals is different. However, in the above embodiment, the seal pressures of both end seals can be set to appropriate values.

  In the above embodiment, the front sealer dividing portion 101a and the rear sealer dividing portion 101b of the upper sealer 101 can be displaced, but the lower sealer 102 may be used, and the same configuration as the upper sealer 101 is also adopted for the lower sealer 102. However, the front and rear sealer dividing portions may be displaced in both the upper and lower sealers 101 and 102. When displacement of the front and rear sealer dividing portions of the upper and lower sealers 101 and 102 is enabled, it is possible to cope with a change in seal height due to a change in product height. Also, by making the level of the sealing surface of the front sealer divided portions 101a, 102a and the rear sealer divided portions 101b, 102b different, the packaging film F is slightly pulled and the cutting performance by the cutter 132 is improved. Can do.

  In addition to the ball screw, an air cylinder can be used. For example, as shown in FIG. 7, air cylinders 134 and 135 for the front and rear sealer dividing portions are arranged on the upper surface of the sealer mounting base 103 in the front and rear directions in the film transport direction. The piston rods 136 and 137 of the air cylinders 134 and 135 are passed through the through holes 138 and 139 and connected to the front and rear sealer dividing portions 101a and 101b, respectively. Each air cylinder 134, 135 is connected to a regulator (not shown). On the other hand, the front and rear sealer dividing portions 102a and 102b of the lower sealer 102 are connected at the lower end portion to form an integral structure, and are attached to the sealer mounting base 104 with the heat insulating plates 133a and 133b interposed.

  In the case of this embodiment, the seal pressure at the front and rear sealer dividing portions can be individually adjusted by adjusting each regulator. For example, when it is necessary to increase the sealing pressure at the front sealer dividing parts 101a and 102a as compared with the rear sealer dividing parts 101b and 102b, the regulator connected to the front sealer dividing part 101a is adjusted, By increasing the air pressure, the seal pressure at the front sealer dividing portions 101a and 102a can be increased.

  Moreover, as shown in FIG. 8, air bleeding can be effectively performed by shifting the seal timing of the front and rear sealer dividing portions 101a and 101b. That is, as shown in FIG. 5A, after the rear sealer dividing portions 101b and 102b are engaged, the cutter 132 is fed out to cut the packaging film F, and then the air venting means 142 is lowered to lower the front pillow packaging body 7. The air is discharged rearward, and then the front sealer dividing portions 101a and 102a are engaged to perform heat sealing. In this way, when air is released from the front pillow package 7, heat sealing of the rear pillow package 7 has already been completed. The air bag phenomenon that enters can be prevented. Note that the rear sealer 101b is moved backward so as not to burn the film after sealing.

DESCRIPTION OF SYMBOLS 1 Automatic packaging machine 2 Original fabric roll 3 Supply part 4 Bag making machine 5 Center seal part 6 Finger conveyor 7 Pillow package 8, 9 Belt conveyor 10 Press belt 100 End seal device 101 Sealer 101a Front sealer division part 101b Rear sealer division part 102 Sealer 102a Front sealer split part 102b Rear sealer split part 103, 104 Sealer mounting base 105, 106 Rotating shaft 107, 108 Rotating plate 109, 110 Cam plate 111, 112 Drive shaft 113, 114 Notch 115, 116 Bearing part 117, 118 Drive gear 119 Input shaft 120 Drive gear 121 Input gear 122, 123 Ball screw nut 124, 125 Gear 126 Motor 126a Output shaft 127 Motor 127a Output shaft 128, 129 Drive gear 130, 131 Ball screw 13 Cutter 133a, 133b insulating plates 134 and 135 air cylinder 136 piston rod 138 and 139 through holes 140a, 140b holders 141a, 141b spring 142 air vent means A article F packaging film

Claims (4)

In an end seal device that heat seals in the film width direction with a pair of sealers sandwiching a packaging film formed into a cylindrical shape,
Each of the sealers is attached to a pair of sealer mounts, and includes a front sealer dividing portion and a rear sealer dividing portion arranged with a gap before and after the packaging film in the conveying direction, and one of the sealers includes A cutting cutter is disposed between the front sealer dividing portion and the rear sealer dividing portion so as to be able to go in and out, and at least one of the sealers includes the front sealer dividing portion and the rear sealer dividing portion as separate bodies. Provided, these are connected to separate actuators, and are attached to the sealer mounting base so as to be displaceable in a direction facing the other sealer, and the front sealer split part is engaged with the rear sealer split parts, After the cutter is drawn out to cut the packaging film and the front packaging body is pressed by the air venting means, it is bitten. End sealing apparatus according to claim Ukoto.   The end seal device according to claim 1, wherein the actuator is a fluid pressure cylinder.   The end seal device according to claim 2, wherein the fluid pressure cylinder is an air cylinder. An automatic packaging machine comprising the end seal device according to any one of claims 1 to 3 .

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