Zipper attaching device

Abstract

To provide a zipper attaching device that can accelerate operation of a packaging machine even when the length of a zipper chip is changed.SOLUTION: A zipper attaching device 9 includes: a delivery member 51 for moving a zipper tape T; a cutter 40 for cutting the zipper tape T to form a zipper chip Z; a delivery member 52 for delivering the zipper chip Z having been cut by the cutter 40 to an attaching position P to a packaging material W; a support mechanism 60 for supporting the cutter 40 movably along a direction X which is the direction of movement of the zipper tape T; and a positioning mechanism 70 for positioning a position of the cutter 40 in the direction X with respect to the zipper tape T.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a zipper pasting device that supplies and pastes zipper pieces onto packaging materials on a packaging machine.

Background Art

[0002] Conventionally, technologies related to zipper pasting devices that supply and paste zipper pieces onto packaging materials on a packaging machine are known. For example, Patent Document 1 describes a zipper pasting device that cuts a zipper tape with a cutter and then conveys it to the upper surface of the packaging material. In this zipper pasting device, the cutting position of the zipper tape by the cutter is fixed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the cutting position of the zipper tape is fixed, if the length of the zipper piece after cutting becomes shorter, the distance to convey the zipper piece to the pasting position on the packaging material becomes longer. Therefore, there is a risk of preventing the packaging machine from operating at high speed as a result.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a zipper pasting device capable of achieving high-speed operation of the packaging machine even when the length of the zipper piece is changed.

Means for Solving the Problems

[0006] In order to achieve the above object, the zipper pasting device of the present invention is a zipper pasting device that supplies and pastes zipper pieces to a packaging material, and includes a feeding member that moves a zipper tape, a cutting device that cuts the zipper tape to form zipper pieces, a conveying member that conveys the zipper pieces cut by the cutting device to a pasting position with respect to the packaging material, a support mechanism that movably supports the cutting device along the moving direction of the zipper tape, and a positioning mechanism that positions the position of the cutting device with respect to the zipper tape in the moving direction.

Advantages of the Invention

[0007] According to the zipper pasting device of the present invention, the length of the zipper piece can be easily changed, and even if the length of the zipper piece is changed, it is possible to increase the operating speed of the packaging machine.

Brief Description of the Drawings

[0008]

Figure 1

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Embodiments for Carrying Out the Invention

[0009] (Bag-making and filling packaging machine) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a vertical bag-making and filling packaging machine equipped with a zipper attaching device according to the embodiment. The vertical bag-making and filling packaging machine 1 (hereinafter referred to as "packaging machine 1") includes a bag-making tube 2, a packaging material feeder 3, a longitudinal sealing device 4, a transverse sealing device 5, a control device 8, and a zipper attaching device 9. Each component of the packaging machine 1 is supported by a main body frame (not shown). In the following description, the "frame member not shown" means a frame member fixed to the main body frame.

[0010] The packaging machine 1 is supplied with fillers such as powders, granules, and solids, such as food, to be filled in the bag F. The bag-making tube 2 extends in the vertical direction and receives the supply of the filler inside through a hopper (not shown) connected to its upper end. Note that a filling tube extending in the vertical direction and connected to the hopper may be arranged inside the bag-making tube, and the filler may be supplied into the bag-making tube 2 through the filling tube. A former 6 is attached to the bag-making tube 2, and a packaging material feeding path 7 extends from the former 6 to the packaging material roll WR. The packaging material W has a zipper piece Z (see FIG. 2) supplied from the zipper attaching device 9 temporarily attached thereto by welding at the attaching position P in the middle of the packaging material feeding path 7.

[0011] The packaging material feeders 3 are arranged one on each side of the bag-making tube 2 below the former 6. Each packaging material feeder 3 has an endless suction belt, adsorbs the packaging material W on the suction belt, and feeds the packaging material W downward along the outer peripheral surface of the bag-making tube 2 by the running of the suction belt. As a result, the packaging material W, such as a heat-sealable film, from the packaging material roll WR is fed out along the packaging material feeding path 7 and guided downward along the outer periphery of the bag-making tube 2 while being formed into a cylindrical shape surrounding the bag-making tube 2 by the former 6. At this time, a lap portion is formed on the packaging material W in which both side edges of the cylindrical packaging material W are overlapped with each other in a predetermined form.

[0012] The longitudinal sealing device 4 is disposed close to the packaging material W on the outer peripheral surface of the bag-making tube 2, and opens and closes with respect to the bag-making tube 2 to heat-seal the wrap portion of the packaging material W with a pair of heater blocks. The transverse sealing device 5 is provided below the bag-making tube 2, and forms a transverse seal on the packaging material W by sandwiching the packaging material W with a pair of openable and closable heater blocks and heat-sealing, and cuts the packaging material W with a cutter. Further, adjacent to the pair of heater blocks of the transverse sealing device 5, a pair of zipper heater blocks 5z for attaching the zipper pieces Z to the packaging material are provided. The pair of zipper heater blocks 5z operate to open and close separately from the pair of heater blocks of the transverse sealing device 5. Thereby, when a transverse seal is formed on the packaging material W, the zipper pieces Z are attached by welding to the inner surface of the packaging material W formed in a tubular shape by the pair of zipper heater blocks 5z. As a result, the upper and lower ends of the packaging material W after cutting are closed, and a bag F with a zipper filled with a filling material is formed. The zipper piece Z is provided at a location corresponding to the opening position of the bag F.

[0013] The control device 8 is a control device that performs overall control of the packaging machine 1, and is configured to include an input / output device, a storage device (ROM, RAM, non-volatile RAM, etc.), a central processing unit (CPU), and the like. The control device 8 controls various devices and various equipment provided in the packaging machine 1, such as the packaging material feeder 3, the longitudinal sealing device 4, the transverse sealing device 5, and the zipper attaching device 9, according to various settings input by the input / output device.

[0014] (Zipper piece) Fig. 2(a) is a front view showing the zipper piece Z, and Fig. 2(b) is a cross-sectional view taken along the line A-A in (a). Note that Fig. 2 schematically shows the zipper piece Z. The zipper piece Z has a male-side zipper piece ZA and a female-side zipper piece ZB. The male-side zipper piece ZA has a fitting convex portion ZAt extending in the longitudinal direction and a male-side flange portion ZAf extending from the fitting convex portion ZAt to one side in the short direction (width direction). The female-side zipper piece ZB has a fitting concave portion ZBu extending in the longitudinal direction and female-side flange portions ZBf extending from the fitting concave portion ZBu to both sides in the short direction (width direction). The male-side zipper piece ZA and the female-side zipper piece ZB form a fitting portion Za by fitting their respective fitting convex portion ZAt and fitting concave portion ZBu together, thereby forming an integral zipper piece Z. The male-side flange portion ZAf and the female-side flange portion ZBf of the zipper piece Z are portions to be welded to the opposing inner surfaces of the bag F. At both ends in the longitudinal direction of the zipper piece Z, a compression portion Zb that compresses the fitting portion Za and a crushed portion Zc that further flattens and welds the central portion of the compression portion Zb are formed. Such a zipper piece Z is formed by cutting the zipper tape T at the center Zd of each crushed portion Zc.

[0015] (Zipper attaching device) The zipper attaching device 9 includes a supply device 10, a direction conversion unit 20, an end welding device 30, a cutting device 40, a feeding and conveying device 50, and a welding device (not shown). The zipper attaching device 9 converts the direction of the zipper tape T supplied from the supply device 10 to the side of the packaging material feeding path 7 by the direction conversion unit 20, then forms the compression portion Zb and the crushed portion Zc on the zipper tape T by the end welding device 30, cuts the zipper tape T by the cutting device 40 to form the zipper piece Z, positions the zipper piece Z at the attaching position P of the packaging material W by the feeding and conveying device 50, and temporarily attaches it by thermocompression bonding to the packaging material W with a welding device (not shown).

[0016] (Supply device) FIG. 3 is a perspective view showing the supply device 10. As shown in FIG. 3, the supply device 10 includes a zipper roll ZR around which a zipper tape T is wound, an electric motor M that rotationally drives the zipper roll ZR, and a tension adjustment mechanism 11. The zipper roll ZR and the electric motor M are rotatably attached to a first fixing plate 101. Here, as shown in FIG. 1, the zipper roll ZR is arranged along a direction orthogonal to the axial direction of the packaging material roll WR. That is, the zipper tape T wound around the zipper roll ZR is fed out along a direction that coincides with the width direction of the packaging material W in the packaging material feeding path 7. In the following description, one of the horizontal directions, which is the moving direction of the zipper tape T, is referred to as the "direction X", and the other horizontal direction orthogonal to the direction X is referred to as the "direction Y". Note that the direction orthogonal to the direction X and the direction Y is the vertical direction (axial direction). Also, the side of the zipper roll ZR on the moving path of the zipper tape T is referred to as the "upstream side", and the opposite side is referred to as the "downstream side".

[0017] The tension adjustment mechanism 11 adjusts the tension of the zipper tape T fed out from the zipper roll ZR. FIG. 4(a) is a perspective view of the tension adjustment mechanism 11 viewed from one side in the direction Y, and FIG. 4(b) is a perspective view of the tension adjustment mechanism 11 viewed from the other side in the direction Y. FIG. 5(a) is a front view of the tension adjustment mechanism 11 viewed from one side in the direction Y when the zipper tape T is not being supplied, and FIG. 5(b) is a front view of the tension adjustment mechanism 11 viewed from one side in the direction Y when the zipper tape T is being supplied. The tension adjustment mechanism 11 is attached to a second fixing plate 102 provided above the first fixing plate 101. Note that both the first fixing plate 101 and the second fixing plate 102 are attached to a frame member (not shown). The tension adjustment mechanism 11 includes a plurality of fixed rollers 12, a plurality of movable rollers 13, a roller holding member 14, a dancer lever 15, and a dancer lever driving device 16.

[0018] As shown in FIG. 5, the plurality of fixed rollers 12 are arranged at intervals along the direction X above the zipper roller ZR. The plurality of movable rollers 13 are arranged above the zipper roller ZR so as to be positioned one by one between the plurality of fixed rollers 12 in the direction X. As shown in FIG. 4(a), the roller holding member 14 is attached to a second fixing plate 102 provided above the first fixing plate 101 via a plurality of legs, and rotatably holds the plurality of fixed rollers 12 around an axis along the direction Y. One end of the dancer lever 15 is attached to the second fixing plate 102 via a leg 151 so as to be rotatable around an axis along the direction Y, and rotatably holds the plurality of movable rollers 13 around an axis along the direction Y. The dancer lever 15 is provided with a leg 152 that is inserted into a groove 102a formed in the second fixing plate 102 along the swinging direction of the dancer lever 15.

[0019] As shown in FIG. 4(b), the dancer lever driving device 16 includes a swinging lever 161, an air cylinder 162, and a stroke amount detection sensor 163. One end of the swinging lever 161 is connected to the leg 151, and the other end is connected to the leg 152. The air cylinder 162 moves the piston rod 162a by the air pressure from an air supply source (not shown). The tip of the piston rod 162a is attached to the other end of the swinging lever 161. When the swinging lever 161 swings in response to the movement of the piston rod 162a, the dancer lever 15 swings around an axis along the direction Y. The stroke amount detection sensor 163 detects the stroke amount of the piston rod 162a of the air cylinder 162 and outputs the detection result to the control device 8. Based on the input detection result, the control device 8 detects the swinging state of the dancer lever 15, that is, the position of the other end 15b of the dancer lever 15.

[0020] In this embodiment, the operator manually passes the tip of the zipper tape T wound around the zipper roll ZR through the zipper attaching device 9. At this time, as shown in Fig. 5(a), the operator grips the gripping portion 153 provided on the dancer lever 15 and manually lifts the other end portion 15b of the dancer lever 15 upward. When the control device 8 recognizes that the other end portion 15b has reached the upper end position based on the detection result of the stroke amount detection sensor 163, the control device 8 drives the air cylinder 162 to maintain the state in which the other end portion 15b is lifted by the piston rod 162a. As a result, since the state in which the plurality of movable rollers 13 are located above the plurality of fixed rollers 12 is maintained, the operator can easily pass the zipper tape T between the plurality of fixed rollers 12 and the plurality of movable rollers 13.

[0021] After the operator finishes setting the zipper tape T to the zipper attaching device 9, the operator lowers the other end portion 15b of the dancer lever 15 against the force of the air cylinder 162. When the control device 8 detects the operation in which the other end portion 15b has moved downward based on the detection result of the stroke amount detection sensor 163, the control device 8 stops driving the air cylinder 162. As a result, as shown in Fig. 5(b), the dancer lever 15 is in a state in which the other end portion 15b has moved downward due to its own weight. As a result, the zipper tape T extends through each of the fixed rollers 12 and each of the movable rollers 13 one by one, and tension is applied to the zipper tape T. In addition, a buffer for the zipper tape T is formed.

[0022] Here, the feeding and conveying device 50 described later intermittently feeds out the zipper tape T by a length corresponding to the product specifications of the bag F. On the other hand, the zipper roll ZR is rotationally driven by an electric motor M. If the amount of the zipper tape T fed out from the zipper roll ZR within a predetermined period is the same as the amount of the zipper tape T fed out by the feeding and conveying device 50, the dancer lever 15 repeats temporary vertical oscillations in response to the intermittent feeding of the zipper tape T, but the average position does not change. However, if the rotational speed of the electric motor M is fixed, the smaller the diameter of the zipper roll ZR, the smaller the amount of the zipper tape T fed out from the zipper roll ZR within a predetermined period. Therefore, the other end portion 15b of the dancer lever 15 gradually rises upward, and the average value of the stroke amount of the air cylinder 162 within a predetermined period increases.

[0023] Therefore, the control device 8 estimates the current diameter of the zipper roll ZR, that is, the remaining amount of the zipper tape T, based on the average value of the stroke amount of the air cylinder 162 within a predetermined period. This estimation may be performed based on, for example, experiments, analyses, or the accumulation of empirical values in actual machines. Then, the control device 8 increases the rotational speed of the electric motor M as the estimated diameter of the zipper roll ZR becomes smaller. Thereby, the amount of the zipper tape T fed out from the zipper roll ZR within a predetermined period can be generally matched with the amount of the zipper tape T fed out by the feeding and conveying device 50, and the position of the dancer lever 15 can be generally kept constant. As a result, it becomes possible to generally maintain the tension of the zipper tape T and the buffer amount in the tension adjustment mechanism 11. Further, based on the estimated remaining amount of the zipper tape T, it is possible to recognize that the time for replacing the new zipper roll ZR is approaching and notify the operator to that effect.

[0024] (Direction conversion section) As shown in FIG. 3, the direction conversion unit 20 includes four direction conversion rollers 21, 22, 23, and 24. FIG. 6(a) is a perspective view showing the direction conversion rollers 21, 22, 23, and 24, and FIG. 6(b) is a side view showing the direction conversion rollers 21, 22, 23, and 24. The direction conversion roller 21 is a fixed roller 12 provided at the most downstream of the roller holding member 14, and is rotatably arranged around an axis along the direction Y. The direction conversion rollers 22, 23, and 24 are provided on a frame member (not shown) on the downstream side of the supply device 10. The direction conversion roller 22 is rotatably arranged around an axis along the direction X directly above the direction conversion roller 21. The direction conversion roller 23 is rotatably arranged around an axis along the direction X at a position spaced apart from the direction conversion roller 22 in the direction Y. The direction conversion roller 24 is rotatably arranged around an axis along the direction Y directly below the direction conversion roller 23.

[0025] After passing through the direction conversion roller 21, the zipper tape T is twisted by 90 degrees between the direction conversion rollers 21 and 22 and passes through the direction conversion roller 22, and extends parallel to the direction conversion roller 23. Further, after passing through the direction conversion roller 23, the zipper tape T is twisted by 90 degrees again between the direction conversion rollers 23 and 24 and passes through the direction conversion roller 24. As a result, the moving direction of the zipper tape T is converted by 180 degrees from the inlet side to the outlet side of the direction conversion unit 20. As a result, as shown in FIG. 1, the area where the supply device 10 is arranged and the areas where devices such as the end welding device 30, the cutting device 40, and the feeding and conveying device 50 are arranged can be arranged overlappingly when viewed from the direction Y. Therefore, it is possible to shorten the length of the zipper pasting device 9 in the direction X, and the installation space of the supply device 10 can be reduced.

[0026] Incidentally, the operation of stretching the zipper tape T over the direction-changing rollers 21, 22, 23, and 24 is manually performed by an operator as described above. At this time, unless the twisting direction of the zipper tape T between the direction-changing rollers 21 and 22 is opposite to the twisting direction of the zipper tape T between the direction-changing rollers 23 and 24 (see the arc arrows in FIG. 3), the upper and lower surfaces of the zipper tape T may be reversed between the inlet side and the outlet side of the direction-changing unit 20, and the attachment direction of the zipper piece Z to the bag F may be opposite to the product specification. Therefore, as shown in FIG. 6, the direction-changing rollers 21, 22, 23, and 24 of the embodiment are formed with slits S that notch the outer peripheral surface along the circumferential direction. The slit S is formed in one-half of the axial direction of the direction-changing rollers 21, 22, 23, and 24. The slit S is formed as a mark that straddles the half-side where both the male flange portion ZAf and the female flange portion ZBf of the zipper tape T are formed. Note that the slit S may be used as a mark that straddles the half-side where only the female flange portion ZBf of the zipper tape T is formed. Thereby, by adjusting the attachment direction of the direction-changing rollers 21, 22, 23, and 24 in advance, it is possible to suppress the occurrence of an error in the twisting direction of the zipper tape T using the slit S as a mark.

[0027] (End Welding Device and Cutting Device) Next, the end welding device 30 and the cutting device 40 will be described. FIG. 7 is a perspective view showing the end welding device 30 and the cutting device 40, and FIG. 8 is an enlarged perspective view of FIG. 7. FIG. 9 is a perspective view showing the cutting device 40, and FIG. 10 is a front view showing the cutting device 40. FIG. 11(a) is an explanatory view showing an example of a state where the knife 44 of the cutting device 40 is at the lowermost end, FIG. 11(b) is an explanatory view showing an example of a state where the knife 44 is at the uppermost end, and FIG. 11(c) is an explanatory view showing another example of a state where the knife 44 is at the lowermost end.

[0028] (End Welding Device) The end welding device 30 is provided on the downstream side of the direction conversion unit 20. The end welding device 30 is attached to a frame member (not shown) via a moving mechanism (not shown) so as to be movable along the direction X of the zipper tape T. The moving mechanism (not shown) can use a mechanism that converts rotational motion, such as a rack and pinion mechanism, into linear motion along the direction X. In this embodiment, the end welding device 30 can be moved by an operator rotating the handle 34. The end welding device 30 is an ultrasonic device having an ultrasonic head 31, an anvil 32, and a support substrate 33 that support these with the zipper tape T sandwiched therebetween. The end welding device 30 is driven and controlled by the control device 8, and while pressing and clamping the zipper tape T between the ultrasonic head 31 and the anvil 32, ultrasonic waves are oscillated from the ultrasonic head 31 to form the above-described compression portion Zb and crushed portion Zc in the zipper tape T. The compression portion Zb and the crushed portion Zc are formed at intervals corresponding to the length of the zipper piece Z by the intermittent feeding of the zipper tape T.

[0029] (Cutting device) The cutting device 40 is provided on the downstream side of the end welding device 30. As shown in FIGS. 8 and 9, the cutting device 40 includes a support substrate 41, a bracket 42, a clamping member 43, a knife 44, a slide mechanism 45, a link mechanism 46, and a knife driving device 47. The support substrate 41 is attached to a support mechanism 60 described later. The bracket 42 is attached on the support substrate 41 and has a notch portion 42a (FIG. 9) that is cut out in a rectangular shape at its upper portion.

[0030] The clamping member 43 includes a fixed member 431 attached to the bracket 42, a movable member 432 provided above the fixed member 431, and an air cylinder 433 that moves the movable member 432 up and down with respect to the fixed member 431. The upper surface of the fixed member 431 extends along the direction X and is provided on the path of the zipper tape T. The fixed member 431 is composed of two members with grooves 431a extending in the vertical direction, which serve as the movement path of the knife 44, formed between them. The movable member 432 extends along the direction X and is a portion that sandwiches the zipper tape T between it and the fixed member 431. A groove 432a extending in the vertical direction, which serves as the movement path of the knife 44, is formed in the movable member 432. Further, on the side of the movable member 432 in the direction X, a pressing member 434 is provided, which is arranged at a vertical interval from the fixed member 431. The pressing member 434 restricts the movement of the zipper tape T between it and the fixed member 431.

[0031] The air cylinder 433 has guide rods built in on both sides of the piston rod 433a to guide the reciprocating movement of the piston rod 433a, and a plate member 433b is attached to the tip of the piston rod 433a. A connecting member 433c connected to the movable member 432 is attached to the plate member 433b. Note that a groove is formed in the connecting member 433c through which the end of the knife 44 can move. The air cylinder 433 is driven and controlled by the control device 8, and the piston rod 433a is moved by the air pressure from an air supply source (not shown), thereby moving the movable member 432 up and down via the plate member 433b and the connecting member 433c. Before the zipper tape T is cut by the knife 44, the control device 8 moves the movable member 432 toward the fixed member 431 to sandwich the zipper tape T between the fixed member 431 and the movable member 432. When the conveying member 52 (described later) sandwiches the cut zipper tape T, the control device 8 releases the clamping of the zipper tape T by the fixed member 431 and the movable member 432.

[0032] The knife 44 is disposed at a position overlapping the zip tape T when viewed from above and below within the notch 42a of the bracket 42. The knife 44 has a cutting edge formed at its upper edge and is attached to the slide mechanism 45 at its lower end. The slide mechanism 45 includes a vertically extending rail 451 provided on the bracket 42 and a slide member 452 movably provided along the rail 451. A holder 454 is attached to the slide member 452. The knife 44 is attached to one end of the holder 454 within the notch 42a, and a link mechanism 46 is attached to the other end.

[0033] The link mechanism 46 includes a first link member 461, a second link member 462, and a third link member 463. The first link member 461 is formed in a substantially V shape, rotatably attached to the holder 454 of the slide member 452 at its upper end, and rotatably attached to the second link member 462 at its lower end. The second link member 462 is rotatably attached to the lower end of the first link member 461 at its upper end and rotatably attached to the bracket 42 at its lower end. The third link member 463 is rotatably attached to a middle portion of the second link member 462 at one end and rotatably attached to the knife driving device 47 at the other end.

[0034] The knife driving device 47 includes an air cylinder 471 having guide rods for guiding the reciprocating movement of the piston rod built therein on both sides of the piston rod 471a, and a plate member 472 is attached to the tip of the piston rod 471a. The air cylinder 471 is driven and controlled by the control device 8, and the piston rods 471a are moved by air from an air supply source (not shown), and the plate member 472 is moved along the direction X. The third link member 463 is rotatably attached to the plate member 472.

[0035] With this configuration, as shown in the change from Fig. 11(a) to Fig. 11(b), when the piston rod 471a of the air cylinder 471 is moved to the right side in the figure from the contracted state, as the plate member 472 moves, the third link member 463 is pulled to the right side, the second link member 462 rotates clockwise with the lower end as the fulcrum, and the upper end thereof moves obliquely upward to the right. Accordingly, the lower end of the first link member 461 also moves obliquely upward to the right side, and the upper end moves upward. As a result, the slide member 452 moves upward along the rail 451, and the knife 44 also moves upward. As shown in Fig. 11(b), when the lower end of the second link member 462 and the upper end of the first link member 461 are at the position where they are farthest apart, the knife 44 reaches the upper limit point. Thereby, the knife 44 moves upward through the groove 431a of the fixed member 431 and the groove 432a of the movable member 432 to above the zipper tape T and cuts the zipper tape T.

[0036] Also, as shown in the change from Fig. 11(b) to Fig. 11(c), when the piston rod 471a is further moved to the right in the figure, the second link member 462 further rotates due to the movement of the plate member 472 and the third link member 463 to the right side, and the upper end thereof moves obliquely downward to the right. Accordingly, the lower end of the first link member 461 also moves obliquely downward to the right side, and the upper end thereof moves downward. As a result, the slide member 452 moves downward along the rail 451, and the knife 44 also moves downward. Thus, in the cutting device 40 of the present embodiment, in the forward movement operation of the knife driving device 47 (the operation from Fig. 11(a) to Fig. 11(c)), the upward movement and the downward movement of the knife 44 are each performed once. Also, in the double-route operation of the knife driving device 47 (the operation from Fig. 11(c) to Fig. 11(a)), the upward movement and the downward movement of the knife 44 are each performed once. As described above, the slide mechanism 45 and the link mechanism 46 constitute a power transmission mechanism that converts both the forward movement operation and the return movement operation of the reciprocating knife driving device 47 into the vertical movement of the knife 44. Therefore, the zipper tape T can be cut twice by the reciprocating operation of the knife driving device 47.

[0037] (Support mechanism of the cutting device) Next, the support mechanism 60 that supports the cutting device 40 will be described. FIG. 12 is a perspective view showing the support mechanism 60, and FIG. 13 is a plan view showing the support substrate 41 of the cutting device 40 attached to the support mechanism 60. As shown in FIG. 12, the support mechanism 60 includes a support frame 61, a first rail 62, a second rail 63, a first slide member 64, and a second slide member 65. The support frame 61 extends along the direction X and is attached to a frame member (not shown). The first rail 62 and the second rail 63 are provided on the support frame 61 with a space therebetween in the direction X. The first rail 62 and the second rail 63 are guide rails extending along the direction X. The first slide member 64 is movably attached to the first rail 62, and the second slide member 65 is movably attached to the second rail 63. In addition, in FIG. 13, the support substrate 33 of the end welding device 30, the third rail 66, and the third slide member 67 are also shown. The third rail 66 is a rail extending along the direction X and is provided on a frame member (not shown). The third slide member 67 is movably provided on the third rail 66. The support substrate 33 is attached to the third slide member 67 and is configured to be movable on the third rail 66 together with the third slide member 67.

[0038] As shown in FIG. 13, the support substrate 41 of the cutting device 40 is attached onto the first slide member 64. Further, as shown in FIG. 7, a bracket 48a is provided on the support substrate 41, and brackets 48b provided at intervals in the direction X are connected to the bracket 48a via a film guide 49. The bracket 48b is attached to the second slide member 65. Thereby, the cutting device 40 can move along the first rail 62 and the second rail 63 together with the first slide member 64 and the second slide member 65. That is, the support mechanism 60 supports the cutting device 40 so as to be movable along the direction X, which is the moving direction of the zipper tape T. The movement of the cutting device 40 is performed manually by an operator.

[0039] (Positioning mechanism) Further, a positioning mechanism 70 for positioning the position of the cutting device 40 with respect to the zipper tape T in the direction X is attached to the support mechanism 60. As shown in FIG. 12, the positioning mechanism 70 includes an upper plate-like member 71 and a lower plate-like member 72 (plate-like members) that are arranged to face each other with a space therebetween in the vertical direction and extend along the direction X. The upper plate-like member 71 and the lower plate-like member 72 are connected to each other at both ends, and the lower plate-like member 72 is attached to the upper surface of the support frame 61. A plurality of positioning holes 73 spaced apart from each other along the direction X are formed in the upper plate-like member 71. Further, a plurality of proximity sensors 74 corresponding to the respective positioning holes 73 are provided on the lower plate-like member 72. Specifically, each proximity sensor 74 is disposed one by one below each positioning hole 73.

[0040] As shown in Fig. 13, the support substrate 41 of the cutting device 40 is provided so as to overlap the upper plate-shaped member 71 of the positioning mechanism 70 from above. A female screw portion (not shown) for attaching the positioning member 75 is formed on the support substrate 41. As shown in Fig. 10, the positioning member 75 has a cylindrical portion 75a formed with a male screw portion for attachment on its outer periphery, a tip pin 75p, and a knob portion 75b for operating the tip pin 75p to protrude and retract. The male screw portion of the cylindrical portion 75a is screwed into the female screw portion of the support substrate 41 for attachment. The positioning member 75 is configured such that when the knob portion 75b is manually pulled, the tip pin 75p retracts inside the cylindrical portion 75a, and when the pulling of the knob portion 75b is released, the tip pin 75p protrudes from the cylindrical portion 75a by a spring (not shown) inside the cylindrical portion 75a. In a state where the pulling of the knob portion 75b is released, the tip pin 75p of the positioning member 75 protrudes below the support substrate 41. By inserting the tip pin 75p of the positioning member 75 into any one of the plurality of positioning holes 73 described above, the positioning of the cutting device 40 in the direction X is achieved. Thereby, the position of the cutting device 40 in the direction X can be adjusted stepwise and easily. Each proximity sensor 74 detects the tip pin 75p of the positioning member 75 and outputs the detection result to the control device 8. Thereby, the control device 8 can recognize which positioning hole 73 the tip pin 75p is inserted into, that is, the position of the cutting device 40 in the direction X. Note that the number and formation interval of the plurality of positioning holes 73 may be determined so that the position adjustment of the cutting device 40 in the direction X can be appropriately performed.

[0041] (Relative Position Adjustment between End Welding Device and Cutting Device) Here, as shown in FIG. 2, in the zipper tape T, the distance from the center Zd of the compression part Zb and the crushed part Zc formed by the end welding device 30 to the cutting position by the cutting device 40 corresponds to the length of the zipper piece Z. If the relative movement of the end welding device 30 and the cutting device 40 is impossible, a mechanism capable of adjusting the length of the zipper tape T (for example, a plurality of movable rollers that change the path of the zipper tape T) is required between the end welding device 30 and the cutting device 40. Providing such a mechanism will cause an increase in the number of parts and prevent space saving, and also take time for length adjustment. Therefore, in the zipper attaching device 9 of the embodiment, as described above, both the end welding device 30 and the cutting device 40 are provided so as to be movable along the X direction, and further have the following configuration.

[0042] As shown in FIGS. 8 and 13, the zipper attaching device 9 includes a guide mechanism 80 that guides the relative movement of the end welding device 30 and the cutting device 40 along the direction X. The guide mechanism 80 includes a slide member 81, a guide 82 and an indicator plate 82a, and a display 83. The slide member 81 is a long flat plate member extending along the direction X, and is attached on the support substrate 41 of the cutting device 40. The slide member 81 projects and extends to the side of the end welding device 30 from the support substrate 41, and is placed on the support substrate 33 of the end welding device 30. The guide 82 is fixed on the support substrate 33 of the end welding device 30 and sandwiches the slide member 81 slidably. Thereby, since the slide member 81 moves along the guide 82, the relative movement between the end welding device 30 and the cutting device 40 can be smoothly guided on the same straight line. The indicator plate 82a is attached on the upper surface of one of the guides 82. The indicator plate 82a is provided with a portion (for example, an arrow, etc., not shown in the figure) indicating the position corresponding to the center of the crushed part Zc formed on the zipper tape T by the end welding device 30 (the center in the direction X between the ultrasonic head 31 and the anvil 32).

[0043] The indicator 83 is attached to the surface of the slide member 81, which is the upper surface in this embodiment. The indicator 83 is marked with a scale indicating the distance between the end welding device 30 and the cutting device 40. In this embodiment, the scale is defined to be displayed with the tip position of the knife 44 in the direction X as the reference position (value 0). Also, as described above, the position corresponding to the central portion of the crushed portion Zc formed in the zipper tape T is indicated by the indicating plate 82a. The distance from the tip position of the knife 44 to the central portion of the crushed portion Zc corresponds to the length L of the zipper strip Z. With the above configuration, the operator can easily adjust the relative positions of the end welding device 30 and the cutting device 40 according to the length L of the zipper strip Z while visually observing the reference position of the scale on the indicator 83 provided on the slide member 81 and the position indicated by the indicating plate 82a. Also, it is not necessary to provide a mechanism for adjusting the length of the zipper tape T between the end welding device 30 and the cutting device 40, and the number of parts can be reduced and the space can be saved.

[0044] (Pay - out conveying device) FIG. 14 is a perspective view showing the pay - out conveying device 50. The pay - out conveying device 50 includes a pay - out member 51 and a conveying member 52. The pay - out member 51 is a mechanism for intermittently paying out the zipper tape T for each length of the zipper strip Z corresponding to the product specifications of the bag F. The pay - out member 51 is movably supported by a guide rail 53 extending in the direction X and moves along the guide rail 53 by the driving force of an electric motor 54. The pay - out member 51 has a grip claw 511 capable of gripping the zipper tape T and an air chuck 512 that opens and closes by air from an air supply source (not shown). The movement of the pay - out member 51 and the drive control of the air chuck 512 are performed by the control device 8.

[0045] The conveying member 52 is a mechanism for conveying the zipper pieces Z after cutting to the pasting position P. The conveying member 52 is movably supported downstream of the feeding member 51 on a guide rail 55 extending in the direction X, and moves along the guide rail 55 by the driving force of an electric motor 56. The conveying member 52 has an air chuck 522 that opens and closes a grip claw 521 capable of gripping the zipper pieces Z cut by the cutting device 40 by air from an air supply source (not shown). The grip claw 521 is formed longer along the direction X than the grip claw 511 of the feeding member 51. The movement of the conveying member 52 and the drive control of the air chuck 522 are performed by the control device 8.

[0046] (Feeding operation, cutting operation and conveying operation) Figs. 15(a) to (e) are explanatory views showing a part of the feeding operation, cutting operation of the zipper tape T and the conveying operation of the zipper pieces Z. In Fig. 15, the members with dot patterns indicate the state of gripping the zipper tape T or the zipper pieces Z, and the members with white indicate the state of not gripping the zipper tape T or the zipper pieces Z. In Figs. 15(a), (b), (c), and (e), the feeding of the packaging material W is stopped.

[0047] As shown in Fig. 15(a), the control device 8 grips the tip of the zipper tape T before cutting with the feeding member 51 and moves it downstream, positioning the zipper tape T at the cutting position Pc (the position overlapping with the tip position of the knife 44 when viewed from the vertical direction) by the cutting device 40. As described above, the feeding length of the zipper tape T corresponds to the length of the zipper piece Z. At this time, the zipper tape T is placed on the fixing member 431 of the sandwiching member 43. At the same time, the control device 8 grips the previously cut zipper piece Z with the conveying member 52 and moves it downstream, positioning it at the pasting position P. The pasting position P is determined such that the center in the width direction of the packaging material W coincides with the center in the longitudinal direction of the zipper piece Z. As shown in Fig. 1, an edge sensor E for detecting the meandering of the packaging material W at its end is provided near the packaging material W, and the control device 8 controls the conveying member 52 based on the detection result of the edge sensor E so that the center in the longitudinal direction of the zipper piece Z coincides with the center in the width direction of the packaging material W. When the position of the longitudinal seal portion of the bag F is not at the center of the bag F as shown in Fig. 1, the pasting position P of the zipper piece Z on the packaging material W is also positioned at the corresponding position of the packaging material W. Thereafter, the control device 8 temporarily attaches the zipper piece Z to the packaging material W with a welding device (not shown).

[0048] Next, as shown in Fig. 15(b), the control device 8 causes the sandwiching member 43 to grip the zipper tape T, releases the grip of the zipper tape T by the feeding member 51, and releases the grip of the zipper piece Z by the conveying member 52. Next, as shown in Fig. 15(c), the control device 8 cuts the zipper tape T with the cutting device 40 to form the next zipper piece Z. The sandwiching member 43 is in a state of sandwiching the tip of the zipper tape T after cutting and the zipper piece Z. At this time, the control device 8 moves the feeding member 51 upstream to a position where it can grip the new tip of the zipper tape T after cutting, and moves the conveying member 52 upstream to a position where it can grip the new zipper piece Z.

[0049] Next, as shown in FIG. 15(d), the control device 8 causes the feeding member 51 to grip the tip of the zipper tape T and the conveying member 52 to grip the zipper slider Z, and then releases the gripping of the zipper tape T and the new zipper slider Z by the sandwiching member 43. Also, during this time, the control device 8 feeds out the packaging material W to a position corresponding to the pasting position P (see the broken line) of the next zipper slider Z, and stops the feeding of the packaging material W again. Then, the control device 8 returns to the process of FIG. 15(a). During the above processing, the formation of the compressed portion Zb and the crushed portion Zc on the zipper tape T by the end welding device 30 may be performed while the movement of the zipper tape T is fixed (between FIGS. 15(b) and 15(d)). As a result, the zipper tape T is sequentially positioned at the cutting position Pc by the cutting device 40, and the new zipper slider Z is sequentially positioned at the pasting position P by the feeding and conveying device 50, and the zipper slider Z is welded to the pasting position P.

[0050] (Length of Zipper Slider and Cutting Position of Zipper Tape) FIGS. 16(a) to (c) are explanatory diagrams showing examples of the cutting positions of the zipper tape T according to the length of the zipper slider Z. As shown in the figure, the length Lz of the zipper slider Z is set according to the width Lw of the packaging material W. Specifically, the length Lz of the zipper slider Z is larger as the width Lw of the packaging material W is larger, and smaller as the width Lw of the packaging material W is smaller. First, as shown in FIG. 16(a), it is assumed that the zipper tape T is cut at the first cutting position Pc1 to form a zipper slider Z1 having a first length L1. At this time, the cut zipper slider Z1 is conveyed by a first conveyance distance D1 from the first cutting position Pc1 to the pasting position P. On the other hand, as shown by the broken line in FIG. 16(b), it is assumed that the zipper tape T is cut at the first cutting position Pc1 to form a zipper slider Z2 having a second length L2 shorter than the first length L1. At this time, the zipper slider Z2 needs to be conveyed by a second conveyance distance D2 longer than the first conveyance distance D1 from the first cutting position Pc1 to the pasting position P. When the conveyance distance D of the zipper slider Z becomes long in this way, it may hinder the high-speed operation of the packaging machine 1.

[0051] Therefore, as described above, the zipper pasting device 9 of the present embodiment is configured such that the cutting device 40 is movable in the direction X and the cutting position Pc of the zipper tape T can be changed. Thereby, as shown by the two-dot chain line in FIG. 16(b), when forming the zipper piece Z2, the zipper tape T can be cut at the second cutting position Pc2 closer to the packaging material W than the first cutting position Pc1. As a result, the conveying distance D of the zipper piece Z2 can be set to the third conveying distance D3 shorter than the second conveying distance D2, and it becomes possible to improve the operating efficiency of the packaging machine 1. In the figure, the first conveying distance D1 and the third conveying distance D3 are shown to have the same length, but this is an example, and the conveying distance D does not necessarily have to be constant. Also, the lower limit value of the conveying distance D is also restricted by the sizes of the packaging material W and the zipper piece Z. For example, as shown in FIG. 16(c), assume that the zipper tape T is cut at the third cutting position Pc3 where the distance ΔD between the cutting position Pc of the zipper piece Z3 pasted on the packaging material W last time and the new zipper piece Z4 is shorter than the length L of the zipper piece Z4 to form the zipper piece Z4. In this case, there is a risk that the zipper piece Z3 and the zipper piece Z4 interfere with each other and the position in the width direction of the packaging material W is displaced. Therefore, the lower limit value of the conveying distance D is set so as to avoid interference between the zipper piece Z3 pasted on the packaging material W last time and the newly cut zipper piece Z4.

[0052] (Interference avoidance mechanism) Returning to the description of the packaging machine 1. When the zipper tape T is fed out for the first time, such as after the restart of the packaging machine 1, a predetermined range at the beginning of the zipper tape T is discarded. Therefore, as shown in FIG. 15(e), it is necessary to move the predetermined range of the zipper tape T to the side of the packaging material W by the feeding and conveying device 50 and perform the cutting process with the cutting device 40 at least once. At this time, if the zipper piece Z was pasted on the packaging material W during the previous operation of the packaging machine 1, there is a possibility that the zipper piece Z and the zipper piece cut by the above process interfere with each other and the position of the packaging material W is displaced.

[0053] Therefore, the packaging machine 1 of the embodiment is provided with an interference avoidance mechanism 90 for avoiding the above interference. FIG. 17 is a perspective view showing the interference avoidance mechanism 90, and FIG. 18 is a side view showing the operation of the interference avoidance mechanism 90. The interference avoidance mechanism 90 is provided for the position variation roller 91 shown in FIG. 1. The interference avoidance mechanism 90 includes a position variation roller 91, a lever support member 92, an inner lever 93, an outer lever 94, a guide frame 95, and a lever drive device 96.

[0054] The position variation roller 91 is one of the path rollers of the packaging material W, extends in the width direction (direction X) of the packaging material W, and abuts on the upper surface of the packaging material W. As shown in FIG. 17, the lever support members 92 are arranged one by one on the outer side in the width direction with respect to the position variation roller 91, and are attached to a frame member (not shown) so as to be vertically movable. A rotating shaft 97 extending parallel to the position variation roller 91 is rotatably spanned between the lever support members 92. The rotating shaft 97 penetrates the lever support member 92 and extends to the outer side in the width direction. Even when the length of the packaging material W for one bag changes according to the change in the bag length of the bag F, the vertical positions of the position variation roller 91 and the lever support member 92 are configured to be adjustable so that the zipper piece Z can be attached to the packaging material W at an appropriate position. The groove 95a of the guide frame 95 described later is formed in a long hole shape to correspond to this.

[0055] The inner lever 93 is attached to both ends of the position variation roller 91 on the inner side in the width direction of the lever support member 92. The inner lever 93 rotatably supports the position variation roller 91. Further, the inner lever 93 is fixed to the rotating shaft 97. The outer lever 94 is arranged on the outer side in the width direction with respect to one of the lever support members 92. The outer lever 94 is fixed to the rotating shaft 97. Further, a roller-shaped protrusion 941 extending outward in the width direction is formed on the outer lever 94.

[0056] As shown in Fig. 18, the guide frame 95 is disposed outside the outer lever 94 in the width direction. A groove 95a extending in the vertical direction is formed in the guide frame 95, and the protruding portion 941 of the outer lever 94 is slidably fitted into the groove 95a. The lever driving device 96 has a plate member 962 attached to the tip of a piston rod 961a extending from an air cylinder 961. The plate member 962 is attached to the guide frame 95 via a pair of upper and lower leg portions 963. Each leg portion 963 is slidably supported by a frame member (not shown) via a bearing 964 (for example, a linear bush).

[0057] As shown in Fig. 18(a), the above interference avoidance mechanism 90 is configured such that the outer lever 94 maintains a substantially vertical state when the piston rod 961a of the air cylinder 961 is extended. During normal operation of the packaging machine 1, the packaging material W is fed out and the zipper pieces Z are supplied by the zipper attaching device 9 in this state. On the other hand, when performing the process of discarding a predetermined range of the first zipper tape T after restarting the packaging machine 1 or the like, the control device 8 contracts the piston rod 961a and moves the guide frame 95 to the left side in the figure as shown in Fig. 18(b). As a result, the outer lever 94 rotates clockwise about the rotation axis 97 with respect to the lever support member 92 while the protruding portion 941 moves upward in the groove 95a. Along with this, the inner lever 93 connected to the rotation axis 97 also rotates clockwise. Thereby, the position-variable roller 91 moves obliquely downward, pulling the packaging material W downward. As a result, as shown by the position change of the zipper piece Z from the broken line in Fig. 18(b) to the solid line, the portion of the packaging material W where the zipper piece Z is attached can be moved from the attachment position P, and it is possible to avoid the interference between the zipper pieces described above.

[0058] (Effects of the Embodiment) As described above, in the zipper pasting device 9 of the embodiment, since the cutting device 40 is movably supported by the support mechanism 60 along the direction X which is the moving direction of the zipper tape T, the conveyance distance D can be appropriately adjusted according to the length L of the zipper piece Z. Therefore, even if the length L of the zipper piece Z is changed, it is possible to increase the operating speed of the packaging machine 1. Also, the positioning mechanism 70 can easily position the position of the cutting device 40.

[0059] Further, by inserting the tip pin 75p of the positioning member 75 attached to the support substrate 41 of the cutting device 40 into any one of the plurality of positioning holes 73, the cutting device 40 can be positioned stepwise and easily. Also, the position of the cutting device 40 can be easily detected by the plurality of proximity sensors 74. Note that the positioning mechanism 70 may have other configurations as long as it can position the position of the cutting device 40 in the direction X. For example, a mechanism for adjusting the positions of the end welding device 30 and the cutting device 40 using a rack and pinion mechanism or an adjustment screw may be used.

[0060] Also, since the end welding device 30 is provided so as to be movable along the direction X, the length L of the zipper piece Z can be adjusted without providing a mechanism for adjusting the length of the zipper tape T, such as a plurality of movable rollers for changing the path of the zipper tape T, between the end welding device 30 and the cutting device 40. Therefore, it is possible to reduce the number of parts and save space, and also to easily adjust the length of the zipper piece Z.

[0061] Also, by the sliding member 81 and the guide 82 of the guide mechanism 80 sliding relative to each other, the relative movement between the end welding device 30 and the cutting device 40 can be smoothly guided on the same straight line. Also, an operator can visually observe the scale of the indicator 83 provided on the sliding member 81 and easily adjust the relative position between the end welding device 30 and the cutting device 40 according to the length L of the zipper piece Z.

[0062] In addition, the slide mechanism 45 and the link mechanism 46 (power transmission mechanism) of the cutting device 40 convert the operations of both the forward path and the return path of the knife driving device 47 into the vertical movement of the knife 44, so that the zipper tape T can be cut twice by the reciprocating movement of the knife driving device 47, and the cutting process can be speeded up.

[0063] With the above, the description of the embodiment ends. However, the aspects of the present invention are not limited to this embodiment. For example, the slide member 81 of the guide mechanism 80 may be fixed to the support substrate 33 of the end welding device 30, and the guide 82 may be provided on the support substrate 41 of the cutting device 40. Also, although the end welding device 30 flattens and welds the fitting portion Za of the zipper tape T, the end welding device 30 may be a device for welding the flange portion of the zipper tape T. Further, the scale may be displayed with the center Zd of the crushed portion Zc by the end welding device 30 as a reference position. Also, the movement of the end welding device 30 along the direction X may be disabled, and a mechanism for adjusting the length of the zipper piece Z may be separately provided between the end welding device 30 and the cutting device 40. Furthermore, although the zipper tape T of the present embodiment has a structure in which the male side flange portion ZAf extends only on one side, it is also possible to use a zipper tape having a structure in which the male side flange portion ZAf extends on both sides in the same manner as the female side flange portion ZBf.

Explanation of Reference Numerals

[0064] 1 Packaging machine (vertical bag-making and filling packaging machine) 9 Zipper attaching device 10 Feeding device 30 End welding device 40 Cutting device 43 Clamping member 44 Knife 45 Slide mechanism (power transmission mechanism) 46 Link mechanism (power transmission mechanism) 47 Knife driving device (power unit) 50 Pay-out conveying device 51 Pay-out member 52 Conveying member 60 Support mechanism 70 Positioning mechanism 71 Upper plate-like member (plate-like member) 72 Lower plate-like member (plate-like member) 73 Multiple positioning holes 74 Multiple proximity sensors 75 Positioning member 80 Guide mechanism 81 Slide member 82 Guide 83 Display D Conveying distance D1 First conveying distance D2 Second conveying distance D3 Third conveying distance F Bag P Attachment position Pc Cutting position Pc1 First cutting position Pc2 Second cutting position Pc3 Third cutting position T Zipper tape W Packaging material Z, Z1, Z2 Zipper pieces Zc Crushed portion

Claims

1. A zipper pasting device for supplying and pasting zipper pieces onto a packaging material, comprising: A feeding member for moving a zipper tape; A cutting device for cutting the zipper tape to form zipper pieces; A conveying member for conveying the zipper pieces cut by the cutting device to a pasting position with respect to the packaging material; A support mechanism for movably supporting the cutting device along the moving direction of the zipper tape; A positioning mechanism for positioning the position of the cutting device with respect to the zipper tape in the moving direction. A zipper pasting device comprising the above components.

2. The positioning mechanism includes: A plate-like member attached to the support mechanism and extending along the moving direction; A plurality of positioning holes formed at intervals along the moving direction on the plate-like member; A positioning member attached to the cutting device and inserted into any one of the plurality of positioning holes; A plurality of proximity sensors provided corresponding to the plurality of positioning holes for detecting the positioning member. The zipper pasting device according to Claim 1, including the above components.

3. The zipper pasting device further comprises an end welding device for forming a crushed portion by crushing and welding the position that becomes the end of the zipper piece with respect to the zipper tape, wherein the end welding device is movably provided along the moving direction. The zipper pasting device according to Claim 1.

4. A slide member fixed to one of the end welding device and the cutting device and extending along the moving direction toward the other; A guide fixed to the other of the end welding device and the cutting device for slidably sandwiching the slide member along the moving direction; A display provided on the surface of the slide member, with a scale indicating the distance between the center of the crushed portion formed by the end welding device and the cutting position of the zipper tape by the cutting device. The zipper pasting device further comprises a guide mechanism including the above components, wherein the scale is displayed with either the cutting position of the zipper tape or the center of the crushed portion formed by the end welding device as a reference position. The zipper pasting device according to Claim 3.

5. The cutting device includes: A knife for cutting the zipper tape; A clamping member for clamping the zipper tape during cutting by the knife; A power unit for reciprocating motion; A power transmission mechanism for converting the motions of both the forward stroke and the return stroke of the power unit into the up-and-down motion of the knife. The zipper pasting device according to any one of Claims 1 to 4, including the above components.

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