JP7236346B2 - Packaging film cutting equipment - Google Patents

Description

The present invention relates to a packaging film cutting device.

Feeding means (feeding unit) for feeding a strip of packaging film in the longitudinal direction, and opening tab forming means (open tab forming unit) for forming tongue-shaped opening tabs at predetermined positions of the packaging film fed by the feeding unit. A rotating blade (moving blade) and a receiving blade (fixed blade) provided downstream from the opening tab forming unit and facing each other across the packaging film cooperate to move the packaging film in the lateral direction (of the packaging film). A packaging film cutting device provided with a main cutting means (cutter unit) for cutting in the width direction is known (see Patent Document 1).

The packaging film cutting apparatus of Patent Document 1 is provided with an opening tab pushing means for pushing the opening tab formed by the opening tab forming unit toward the moving blade side. The opening knob push-out means pushes the opening knob toward the movable blade side by pressing a rod-shaped or pin-shaped pushing member against the opening knob before cutting the packaging film in the horizontal direction by the cutter unit, or the nozzle The opening knob is pushed out toward the moving blade by the pressure of the gas ejected from the opening.

As a result, when cutting the packaging film in the lateral direction by the cutter unit, cutting of the opening tab can be avoided. Further, even if the lateral width of the packaging film changes according to the size of the item to be packaged, and the formation position of the opening tab in the lateral direction is accordingly changed, the position of the opening tab push-out means can be changed. Therefore, it is possible to avoid cutting the opening tab.

Japanese Patent No. 3681227

The tear tab pushing means is a rod-like or pin-like pushing member or a nozzle, which is a relatively small member in the packaging film cutting apparatus. Therefore, precise adjustment is required to move such a small member so as to coincide with the formation position of the opening tab, which is also a small portion of the packaging film, and this is a factor that hinders improvement in work efficiency. In addition, since a complicated mechanism is required to operate the opening knob push-out means, the equipment cost is high.

On the other hand, as in the prior art described in Patent Document 1, a notch is provided in the movable blade or the fixed blade of the cutter unit to avoid cutting the opening tab, and the position of the notch is changed according to the specifications of the packaging film. Preparing various types of movable blades or fixed blades increases equipment costs. Moreover, when replacing the movable blade or the fixed blade, it is necessary to carry out a positioning operation for aligning the notch with the formation position of the opening tab.

In this positioning operation, it is necessary to precisely align the notch with the opening tab and to realign the moving blade with the fixed blade. Therefore, this work also requires labor and skill, and is a factor that hinders improvement in work efficiency.

The present invention has been made in view of such problems, and the width of the packaging film changes according to the size of the item to be packaged, and the position of the opening tab in the horizontal direction is changed accordingly. Even if there is, when cutting the packaging film in the horizontal direction, cutting of the opening tab can be easily avoided at low cost without replacing the movable blade or the fixed blade, and the formation position of the opening tab can be changed. It is an object of the present invention to provide a packaging film cutting device capable of improving work efficiency.

In order to achieve the above object, the packaging film cutting apparatus of the present invention has a feeding unit for feeding out a belt-shaped packaging film in the longitudinal direction, and a tongue-shaped opening knob at a predetermined position of the packaging film fed out by the feeding unit. and a movable blade and a fixed blade which are provided downstream from the opening tab forming unit and which face each other with the packaging film therebetween cooperate to laterally move the packaging film at the position where the opening tab is formed. a cutter unit for cutting in a direction, wherein the cutter unit is formed on at least one of the moving blade and the fixed blade, and includes an escape groove for avoiding cutting of the opening knob when cutting the packaging film, and an escape to the opening knob. and a moving mechanism for laterally moving the movable and fixed blades to align the grooves.

Therefore, according to the packaging film cutting apparatus of the present invention, when cutting the packaging film in the horizontal direction, cutting of the opening tab can be easily avoided at low cost without replacing the movable blade or the fixed blade. Also, it is possible to improve the work efficiency related to changing the formation position of the opening tab.

1 is a schematic perspective view of an overwrap packaging device incorporating a packaging film cutting device according to an embodiment of the present invention; FIG. FIG. 2(a) is a configuration diagram of the packaging film cutting device as viewed from the side, and (b) is an explanatory diagram in which the flow of cutting work of the packaging film is associated with each other. 1 is a perspective view of a product wrapped by an overwrap packaging machine; FIG. It is a perspective view of a cutter unit. 5A is a side view of the cutter unit viewed from the direction A in FIG. 4, and FIG. 5B is a cross-sectional view of the cutter unit viewed from the direction BB in FIG. 4. FIG. 5(a) is a diagram showing the positional relationship between the receiving blade and the packaging film in FIG. 5(a), and FIG. 6(b) is an enlarged view of region D in FIG. 6(a). (a) A side view of the rotating blade and the receiving blade when cutting the packaging film in the horizontal direction in region C in FIG. 6, (b) in region D in FIG. It is a side view of a rotary blade and a receiving blade.

A packaging film cutting device according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a perspective view of an overwrap packaging machine 1 incorporating a packaging film cutting device 10 according to one embodiment of the present invention. The overwrap packaging device 1 automatically wraps the wrapping film 3 on the surface of the object 2 to be wrapped. The packaging film cutting device 10 cuts the strip-shaped packaging film 3 fed in the direction indicated by the dashed arrow to a predetermined length in the longitudinal direction, and automatically supplies it to the packaging position P1.

The items to be packaged 2 conveyed in the direction indicated by the solid line arrow are pushed one by one to the packaging position P1 by a pushing member (not shown). The packaging film 3 is unwound from either one of a pair of film reels 4, and at this time, an opening tape 7 unwound from a tear tape (opening tape) reel 6 is fused to a predetermined position of the packaging film 3 by a heater or the like. be.

The packaging film 3 to which the opening tape 7 is fused is cut to a predetermined length by the packaging film cutting device 10 and supplied to the packaging position P1. At the packaging position P1, the packaging film 3 cut by the packaging film cutting device 10 is supplied vertically downward in the direction intersecting the direction in which the object to be packaged 2 is pushed out, and the packaging film 3 passes through the packaging position P1. It is wrapped around the surface of the item to be packaged 2 .

The side and flaps of the packaging film 3 extending from each end of the package 2 are sequentially folded at the folding position P2 where the package 2 wrapped with the packaging film 3 is conveyed. At the time of folding, the overlapping packaging films 3 are properly sealed. In this way, the entire surface of the item 2 to be packaged is wrapped by the packaging film 3 , and the wrapped product 5 is discharged from the overwrap packaging device 1 .

FIG. 2 shows (a) a configuration diagram of the packaging film cutting device 10 viewed from the side, and (b) an explanatory diagram showing the flow of the cutting operation of the packaging film 3. As shown in FIG. The packaging film cutting device 10 includes, in order from the upstream side of the supply direction of the packaging film 3, a fore-edge cutter 11 and its receiving roller 12 (open tab forming unit), a pair of delivery rollers (delivery unit) 13 and 14, and a cutter unit 20. It has A suction belt 15 is provided downstream of the delivery rollers 13 and 14 .

The packaging film 3 continuously fed out by the feeding rollers 13 and 14 is sucked by the suction belt 15 and supplied to the downstream side. At this time, a tongue-shaped opening tab 16 shown in FIG.

The cutter unit 20 is provided downstream of the fore edge cutter 11 and the delivery rollers 13 and 14 and in the middle of the conveying path of the suction belt 15, and has rotating blades (moving blades) facing each other with the packaging film 3 interposed therebetween. 21 and a receiving blade (fixed blade) 22 . The rotary blade 21 is attached to a rotary drum 23, and a plurality of guides 24 are protruded from the outer peripheral surface of the rotary drum 23 in its axial direction. When the packaging film 3 is unwound, the tear tape 7 and the tear tab 16 are positioned in the gaps between the adjacent guides 24 .

The rotating blade 21 and the receiving blade 22 cooperate with each other to cut the packaging film 3 in the width direction of the packaging film 3 intersecting the longitudinal direction of the packaging film 3, in other words, in the lateral direction. Specifically, as the rotating drum 23 rotates, the rotating blade 21 approaches the packaging film 3 in each cutting cycle, and cooperates with the receiving blade 22 to cut the packaging film 3 . The cutting position of the packaging film 3 coincides with the formation position of the opening tab 16 on the packaging film 3 in the lateral direction.

FIG. 3 shows a perspective view of a product 5 wrapped by the overwrap packaging machine 1. FIG. By pinching the opening tab 16 and tearing the packaging film 3 along the opening tape 7, the article to be packaged 2 can be taken out from the product 5. - 特許庁
4 is a perspective view of the cutter unit 20, and FIG. 5 is (a) a side view of the cutter unit 20 viewed from the direction A in FIG. 4, and (b) the cutter unit 20 viewed from the direction BB in FIG. 1 shows a cross-sectional view of FIG.

The cutter unit 20 of this embodiment includes a moving mechanism 30 that laterally moves the rotary blade 21 and the receiving blade 22 . The moving mechanism 30 includes a frame 31 that forms the main body of the cutter unit 20, a pair of support members 32 that support the frame 31 so as to be movable in the lateral direction, and a movement amount of the frame 31 relative to the pair of support members 32 that can be adjusted. and an adjusting mechanism 33 . The frame 31 and the support member 32 extend in the width direction of the packaging film 3, that is, in the lateral direction.

The receiving blade 22 is fixed to the frame 31 , and the rotating blade 21 is supported so as to be periodically accessible to the receiving blade 22 . Specifically, the shaft portion 23 a of the rotary drum 23 to which the rotary blade 21 is attached is rotatably supported on both sides of the frame 31 . Each of the pair of support members 32 has a laterally extending guide 34, and each guide 34 supports a laterally extending rail 35 on both sides of the frame 31 so as to be linearly movable. That is, the pair of guides 34 and the pair of rails 35 that support them each constitute a linear slider.

The adjusting mechanism 33 adjusts the amount of movement of the cutter unit 20 while supporting the shaft 36 formed with a screw, the moving handle 37 of the cutter unit 20 fixed to one end of the shaft 36, and the shaft 36 on the moving handle 37 side. An indicator portion 38 for displaying and a threaded portion 39 for supporting the shaft 36 on the side opposite to the moving handle 37 are provided. The shaft 36 is rotatably passed through the indicator portion 38 and is threadably passed through the threaded portion 39 . The threaded portion 39 is formed on a side wall 40 a of a drive unit 40 , which will be described later, connected to the longitudinal end of the frame 31 .

As shown in FIG. 5( a ), the pair of supporting members 32 and the indicator section 38 are fixed to the side wall 10 a of the packaging film cutting device 10 . An opening 41 is formed in a region of the side wall 10a facing the side portion of the frame 31. As shown in FIG. By rotating the moving handle 37, the driving unit 40 moves laterally while moving in and out of the opening 41 starting from the side wall 10a to which the screw portion 39, the driving unit 40 and the side wall 40a are fixed. Along with this, the frame 31 also moves laterally. Furthermore, since the amount of rotation by the moving handle 37 (the amount of movement of the cutter unit 20) is displayed on the indicator portion 38, the position of the escape groove 47, which will be described later, can be easily adjusted.

That is, in this embodiment, in the packaging film cutting apparatus 10, the cutter unit 20 is laterally movable by the moving mechanism 30 and the adjusting mechanism 33, and the rotary blade 21 and receiving blade 22 supported by the frame 31 are also laterally movable. It is movable. A guide bar 42 for allowing the packaging film 3 to pass through the gap between the rotary blade 21 and the receiving blade 22 is provided on the upper portion of the frame 31 . A rotary blade handle 43 is provided on the side of the frame 31 opposite to the moving handle 37 .

The rotary blade handle 43 is connected to one end of the shaft portion 23 a of the rotary drum 23 . By rotating the rotary blade handle 43 while the drive unit 40 is stopped, the rotary drum 23 rotates, Blade matching of the rotary blade 21 becomes possible.
The drive unit 40 includes a drive shaft 44 to which the other end of the shaft portion 23 a of the rotary drum 23 is connected, and a servomotor 46 to which the drive shaft 44 is connected through a coupling 45 .

The servomotor 46 rotates the shaft portion 23 a of the rotary drum 23 and thus the rotary blade 21 independently through the drive shaft 44 . By providing the servomotor 46, it is possible to independently control the rotation period of the rotary drum 23 and the cutting period of the packaging film 3 fed out at a predetermined speed.

6 shows (a) the positional relationship between the receiving blade 22 and the packaging film 3 in FIG. 5(a), and (b) an enlarged view of area D in FIG. 6(a). The receiving blade 22 of the present embodiment is formed with a clearance groove 47 for avoiding cutting of the opening tab portion 16 formed by the edge cutter 11 when cutting the packaging film 3 in the lateral direction.

Depending on the size of the item to be packaged 2, the width of the packaging film 3 and the specifications of the packaging film 3 change. As a result, it is assumed that the formation position of the opening tab 16 in the lateral direction is changed. Even in this case, by operating the moving handle 37 to move the frame 31 and thus the receiving blade 22 in the lateral direction as indicated by the dashed-dotted line arrow, the relief groove of the receiving blade 22 is formed in the opening knob 16. 47 can be matched to avoid cutting the tear tab 16.

FIG. 7 shows (a) a side view of the rotary blade 21 and receiving blade 22 when cutting the packaging film 3 in the horizontal direction in region C of FIG. Fig. 10 shows a side view of the rotary blade 21 and the receiving blade when cutting is avoided by the escape groove 47; As shown in FIG. 7A, in the area C of the packaging film 3 that does not include the position where the opening tab 16 is formed, the rotary blade 21 and the receiving blade 22 that are engaged with each other cooperate to move the packaging film 3 laterally. disconnected.

On the other hand, as shown in FIG. 7(b), in the region D of the packaging film 3 including the formation position of the opening tab 16, the opening tab 16 does not come into contact with the rotary blade 21 and therefore remains without being cut. At this time, the escape groove 47 is used as a retraction area for the opening knob 16 . The relief groove 47 is formed by notching the cutting edge 22a formed as a vertical surface at the lower end of the receiving blade 22 downward, and has a groove bottom 47a having a larger area than the planar area of the opening knob portion 16. As shown in FIG. As a result, cutting of the opening knob 16 at the escape groove 47 can be reliably avoided.

As described above, the packaging film cutting apparatus 10 of this embodiment has the escape groove 47 in the receiving blade 22 and the moving mechanism 30 for the cutter unit 20 . As a result, when cutting the packaging film 3 in the lateral direction, cutting of the opening tab 16 can be easily avoided at low cost without replacing the rotary blade 21 or the receiving blade 22. It is possible to improve the working efficiency of changing the formation position.

More specifically, since the cutter unit 20 itself can be moved by the moving mechanism 30, there is no need for precise movement adjustment when the object to be moved is a small member, or a complicated mechanism for the movement. There is no need to prepare a replacement rotary blade 21 or receiving blade 22.

In addition, the moving mechanism 30 includes a frame 31 that supports the rotary blade 21 or the receiving blade 22, a support member 32 that supports the frame 31 so as to be movable in the lateral direction, and a movement amount of the frame 31 relative to the support member 32 that can be adjusted. and an adjusting mechanism 33 that Thereby, the rotary blade 21 and the receiving blade 22 can be moved collectively while maintaining the mutual positional relationship. Therefore, it is not necessary to align the rotary blade 21 and the receiving blade 22 again, and the relief groove 47 can be formed in the opening knob 16 by a simple operation of operating the adjusting mechanism 33 according to the specifications of the packaging film. can be easily matched.

The cutter unit 20 also has a servo motor 46 that independently drives the rotary blade 21 to rotate via a drive shaft 44 that is connected to the shaft portion 23 a of the rotary blade 21 . By providing the servo motor 46, it is possible to independently control the rotation cycle of the rotary drum 23 and the cutting cycle of the packaging film 3 fed out at a predetermined speed according to the specifications of the packaging film. Further, since the servomotor 46 and thus the drive unit 40 can be moved together with the movement of the cutter unit 20, the working efficiency of changing the formation position of the opening tab 16 can be further improved.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.
For example, in the above embodiment, the relief groove 47 is formed in the receiving blade 22, but the relief groove 47 may be formed in the rotary blade 21, or may be formed in both the rotary blade 21 and the receiving blade 22. good.
Also, the configurations of the moving mechanism 30 and the adjusting mechanism 33 are not limited to those described above.

Further, instead of the rotary blade 21 and receiving blade 22 described above, a movable blade and a fixed blade having different configurations may be provided.

3 packaging film 10 packaging film cutting device 13, 14 delivery roller (delivery unit)
16 opening knob part 11 edge cutter (opening knob forming unit)
12 Receiving roller (open tab forming unit)
20 cutter unit 21 rotary blade (moving blade)
22 receiving blade (fixed blade)
23a Shaft 30 Moving mechanism 31 Frame 32 Supporting member 33 Adjusting mechanism 44 Drive shaft 46 Servo motor 47 Escape groove

Claims (3)

a feeding unit for feeding the belt-shaped packaging film in the longitudinal direction;
an opening tab forming unit that forms a tongue-shaped opening tab at a predetermined position of the packaging film fed out by the feeding unit;
A movable blade and a fixed blade, which are provided downstream from the opening tab forming unit and face each other with the packaging film therebetween, cooperate to cut the packaging film in the lateral direction at the position where the opening tab is formed. with a cutter unit,
The cutter unit is
an escape groove formed on at least one of the movable blade and the fixed blade for avoiding cutting of the opening knob when cutting the packaging film;
and a moving mechanism for moving the movable blade and the fixed blade in the lateral direction so as to align the relief groove with the opening tab. The moving mechanism is
a frame on which the fixed blade and the movable blade are supported;
a support member that supports the frame movably in the lateral direction;
2. The packaging film cutting apparatus according to claim 1, further comprising an adjustment mechanism that can adjust the amount of movement of said frame with respect to said support member. The movable blade is a rotary blade, the fixed blade is a receiving blade of the rotary blade,
3. The packaging film cutting apparatus according to claim 1, wherein said cutter unit has a servomotor that independently drives said rotary blade to rotate via a drive shaft connected to the shaft portion of said rotary blade.

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