JP2021020282A - Packaging film cutting device - Google Patents

Abstract

To provide a packaging film cutting device which can easily avoid cutting of an opening tab part at a low cost without replacing a movable blade or fixed blade in cutting a packaging film in a lateral direction, and can improve work efficiency relating to a change of a formation position of the opening tab part.SOLUTION: A packaging film cutting device 10 includes: delivery units 13, 14; opening tab forming units 11, 12 which form an opening tab part 16; and a cutter unit 20 which cuts a packaging film 3 in a lateral direction in a formation position of the opening tab part 16 by cooperation of a movable blade 21 and a fixed blade 22 relatively opposite with the packaging film 3 interposed therebetween. The cutter unit 20 includes a clearance groove which is formed on at least one of the movable blade 21 and the fixed blade 22 and avoids cutting of the opening tab part 16 in cutting the packaging film 3, and a moving mechanism which moves the movable blade 21 and the fixed blade 22 in the lateral direction so as to fit the clearance groove with the opening tab part 16.SELECTED DRAWING: Figure 2

Description

The present invention relates to a packaging film cutting device.

A feeding means (feeding unit) for feeding out a strip-shaped wrapping film in the longitudinal direction, and an opening pick forming means (opening pick forming unit) for forming a tongue-shaped opening picking portion at a predetermined position of the packaging film fed by the feeding unit. The rotary blade (moving blade) and the receiving blade (fixed blade), which are provided on the downstream side of the opening and picking forming unit and face 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 device of Patent Document 1 includes an opening picking extrusion means for pushing out the opening pick portion formed from the opening pick forming unit toward the moving blade side. This opening picking extrusion means pushes the opening picking portion toward the moving blade side by abutting a rod-shaped or pin-shaped pushing member against the opening picking portion before cutting the packaging film laterally by the cutter unit, or a nozzle. The opening knob is pushed out to the moving blade side by the pressure of the gas ejected from.

As a result, when the packaging film is cut in the lateral direction by the cutter unit, it is possible to avoid cutting the opening knob portion. Further, even if the width of the packaging film changes according to the size of the object to be packaged and the forming position of the opening picking portion in the lateral direction is changed accordingly, the position of the opening picking extrusion means is changed. Therefore, it is possible to avoid cutting the opening and picking portion.

Japanese Patent No. 3681227

The opening and picking extrusion means is a rod-shaped or pin-shaped pushing member or nozzle, which is a relatively small member in a packaging film cutting device. Therefore, moving such a small member so as to match the formation position of the opening knob, which is also a small portion of the packaging film, requires precise adjustment and is a factor that hinders the improvement of work efficiency. In addition, equipment costs are high because a complicated mechanism for operating the opening and picking extrusion means is required.

On the other hand, as in the prior art described in Patent Document 1, the moving blade or the fixed blade of the cutter unit is provided with a notch for avoiding cutting of the opening knob, and the notch position is changed according to the specifications of the packaging film. If various types of moving blades or fixed blades are prepared, equipment costs will be high. Moreover, when replacing the moving blade or the fixed blade, positioning work must be performed to align the notch with the forming position of the opening knob.

In this positioning work, the notch must be precisely aligned with the opening knob, and the moving blade must be realigned with the fixed blade. Therefore, this work also requires labor and skill, and is a factor that hinders the improvement of work efficiency.

The present invention has been made in view of such a problem, and is a case where the width of the packaging film changes according to the size of the object to be packaged and the forming position of the opening knob in the lateral direction is changed accordingly. Even if there is, when cutting the packaging film in the lateral direction, cutting of the opening knob can be easily avoided at low cost without replacing the moving blade or the fixed blade, and the formation position of the opening knob can be changed. It is an object of the present invention to provide a packaging film cutting apparatus capable of improving work efficiency.

In order to achieve the above object, the wrapping film cutting device of the present invention has a feeding unit that feeds out a strip-shaped wrapping film in the longitudinal direction, and a tongue-shaped opening knob at a predetermined position of the wrapping film that is fed by the feeding unit. The opening pick forming unit to be formed and the moving blades and the fixed blades that are provided on the downstream side of the opening pick forming unit and face each other across the packaging film cooperate to laterally hold the packaging film at the forming position of the opening picking portion. A cutter unit for cutting in a direction is provided, and the cutter unit is formed on at least one of a moving blade and a fixed blade, and has an escape groove for avoiding cutting of the opening knob when cutting the packaging film and an escape to the opening knob. It has a moving mechanism that moves the moving blade and the fixed blade in the lateral direction so as to match the grooves.

Therefore, according to the wrapping film cutting apparatus of the present invention, when cutting the wrapping film in the lateral direction, cutting of the opening knob can be easily avoided at low cost without replacing the moving blade or the fixed blade. , It is possible to improve the work efficiency related to the change of the forming position of the opening knob.

It is a schematic perspective view of the overwrapping wrapping apparatus which incorporates the wrapping film cutting apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which corresponded with (a) the block diagram which saw the wrapping film cutting apparatus from the side, and (b) the flow of the wrapping film cutting work. It is a perspective view of the product packaged by the overwrapping packaging device. It is a perspective view of a cutter unit. (A) is a side view of the cutter unit viewed from the direction A of FIG. 4, and (b) is a cross-sectional view of the cutter unit viewed from the direction BB of FIG. (A) is a positional relationship diagram between the receiving blade and the packaging film in FIG. 5 (a), and (b) is an enlarged view of the region D in FIG. 6 (a). (A) Side view of the rotary blade and the receiving blade when cutting the packaging film in the lateral direction in the area C of FIG. 6, and (b) When avoiding cutting of the opening knob portion in the area D of FIG. 6 by the relief groove. It is a side view of a rotary blade and a receiving blade.

Hereinafter, the packaging film cutting apparatus according to the embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a perspective view of an overwrapping wrapping device 1 in which a wrapping film cutting device 10 according to an embodiment of the present invention is incorporated. The overwrapping packaging device 1 automatically wraps the packaging film 3 on the surface of the object to be packaged 2. The wrapping film cutting device 10 cuts the strip-shaped wrapping film 3 unwound in the direction indicated by the broken arrow to a predetermined length in the longitudinal direction thereof, and automatically supplies the wrapping film 3 to the wrapping position P1.

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

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 in the direction intersecting the extrusion direction of the object to be packaged 2, vertically downward in the present embodiment, and the packaging film 3 passes through the packaging position P1. It is wrapped around the surface of the object to be packaged 2.

In the packaged object 2 around which the packaging film 3 is wound, the sides and flaps of the packaging film 3 extending from each end of the packaged object 2 are sequentially folded at the conveyed folding position P2. At the time of this folding, the overlapping packaging films 3 are appropriately sealed. In this way, the entire surface of the object to be packaged 2 is wrapped by the packaging film 3, and the packaged product 5 is discharged from the overwrapping 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 in which the flow of cutting work of the packaging film 3 is associated with each other. The wrapping film cutting device 10 includes an edge cutter 11 and its receiving roller 12 (opening and picking forming unit), a pair of feeding rollers (feeding unit) 13, 14 and a cutter unit 20 in this order from the upstream side in the supply direction of the wrapping film 3. It has. Further, a suction belt 15 is provided on the downstream side of the feeding rollers 13 and 14.

The packaging film 3 continuously fed by the feeding rollers 13 and 14 is supplied to the downstream side while being attracted by the suction belt 15. At this time, the tongue piece-shaped opening knob 16 shown in FIG. 2B is cut by the edge cutter 11 at a predetermined position of the packaging film 3, that is, a fusion position of the opening tape 7.

The cutter unit 20 is on the downstream side of the edge cutter 11 and the feeding rollers 13 and 14, and is provided at a position in the middle of the transport path in the suction belt 15, and the rotary blades (moving blades) facing each other across the packaging film 3 are provided. 21 and a receiving blade (fixed blade) 22 are provided. The rotary blade 21 is attached to the rotary drum 23, and a plurality of guides 24 are projected on the outer peripheral surface of the rotary drum 23 in the axial direction thereof. When the packaging film 3 is unwound, the opening tape 7 and the opening picking portion 16 are positioned in the gap between the adjacent guides 24.

The rotary 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 that intersects the longitudinal direction of the packaging film 3, in other words, in the lateral direction. Specifically, as the rotary drum 23 rotates, the rotary blade 21 approaches the wrapping film 3 at each cutting cycle, and cuts the wrapping film 3 in cooperation with the receiving blade 22. The cutting position of the wrapping film 3 coincides with the forming position of the opening knob 16 in the wrapping film 3 in the lateral direction.

FIG. 3 shows a perspective view of the product 5 packaged by the overwrapping packaging device 1. The packaged object 2 can be taken out from the product 5 by pinching the opening picking portion 16 and tearing the packaging film 3 along the opening tape 7.
4A and 4B show a perspective view of the cutter unit 20, FIG. 5 is a side view of the cutter unit 20 as viewed from the direction A of FIG. 4, and FIG. The cross-sectional view seen is shown.

The cutter unit 20 of the present embodiment includes a moving mechanism 30 that moves the rotary blade 21 and the receiving blade 22 in the lateral direction. The moving mechanism 30 makes it possible to adjust the amount of movement of the frame 31 forming the main body of the cutter unit 20, the pair of supporting members 32 that support the frame 31 so as to be movable in the lateral direction, and the amount of movement of the frame 31 with respect to the pair of supporting members 32. It includes 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 rotary blade 21 is supported so as to be periodically accessible to the receiving blade 22. Specifically, the shaft portions 23a of the rotary drum 23 to which the rotary blade 21 is attached are rotatably supported on both side portions of the frame 31. Each of the pair of support members 32 includes guides 34 extending in the lateral direction, and each guide 34 supports the rails 35 extending in the lateral direction on both side portions 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 form a linear slider.

The adjusting mechanism 33 transfers the amount of movement of the cutter unit 20 while supporting the shaft 36 on which the screw is formed, 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. The indicator portion 38 to be displayed and the screw portion 39 that supports the shaft 36 on the side opposite to the moving handle 37 are provided. The shaft 36 is rotatably penetrated by the indicator portion 38 and screwed through the screwed portion 39. The screwed portion 39 is formed on the side wall 40a of the drive unit 40 described later, which is connected to the longitudinal end portion of the frame 31.

As shown in FIG. 5A, the pair of support members 32 and the indicator portion 38 are fixed to the side wall 10a of the packaging film cutting device 10. An opening 41 is formed in a region of the side wall 10a where the side portions of the frame 31 face each other. By rotating the moving handle 37, the driving unit 40 moves laterally while entering and exiting the opening 41, starting from the screwed portion 39, the drive unit 40, and the side wall 10a to which the side wall 40a is fixed. Along with this, the frame 31 also moves in the lateral direction. Further, since the amount of rotation by the moving handle 37 (the amount of movement of the cutter unit 20) is displayed on the indicator unit 38, the position of the relief groove 47, which will be described later, can be easily adjusted.

That is, in the present embodiment, in the packaging film cutting device 10, the cutter unit 20 can be moved laterally by the moving mechanism 30 and the adjusting mechanism 33, and the rotary blade 21 and the receiving blade 22 supported by the frame 31 are also laterally movable. It is movable. A guide bar 42 for passing the packaging film 3 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 23a of the rotary drum 23, and by rotating the rotary blade handle 43 while the drive unit 40 is stopped, the rotary blade 23 rotates with respect to the receiving blade 22. The blades of the rotary blade 21 can be aligned.
The drive unit 40 includes a drive shaft 44 to which the other end of the shaft portion 23a of the rotary drum 23 is connected, and a servomotor 46 to which the drive shaft 44 is connected via a coupling 45.

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

FIG. 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 the region D in FIG. 6 (a). The receiving blade 22 of the present embodiment is formed with a relief groove 47 for avoiding cutting of the opening knob portion 16 formed by the edge cutter 11 when the packaging film 3 is cut in the lateral direction.

The width of the wrapping film 3 and the specifications of the wrapping film 3 change according to the size of the object to be packaged 2, and the formation position of the opening tape 7 in the lateral direction, as shown by the two-dot chain arrow in FIG. As a result, it is assumed that the formation position of the opening knob 16 in the lateral direction is changed. Even in this case, by operating the moving handle 37 to move the frame 31 and the receiving blade 22 laterally as indicated by the alternate long and short dash arrow, the relief groove of the receiving blade 22 is formed in the opening knob 16. By matching 47, it is possible to avoid cutting the opening picking portion 16.

7A and 7B are a side view of the rotary blade 21 and the receiving blade 22 when the packaging film 3 is cut in the lateral direction in the area C of FIG. 6, and FIG. 7B is an opening knob portion 16 in the area D of FIG. A side view of the rotary blade 21 and the receiving blade when cutting is avoided by the relief groove 47 is shown. As shown in FIG. 7A, in the region C of the packaging film 3 that does not include the forming position of the opening and picking portion 16, the packaging film 3 is laterally moved by the cooperation of the rotary blade 21 and the receiving blade 22 that are aligned with each other. Be disconnected.

On the other hand, as shown in FIG. 7B, in the region D of the packaging film 3 including the formation position of the opening picking portion 16, the opening picking portion 16 does not come into contact with the rotary blade 21, and therefore remains without being cut. At this time, the relief groove 47 is used as a retracting area for the opening and picking portion 16. The relief groove 47 is formed by cutting out a 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 an area larger than the flat area of the opening knob 16. As a result, it is possible to reliably avoid cutting the opening knob 16 in the relief groove 47.

As described above, the packaging film cutting device 10 of the present embodiment has a relief groove 47 in the receiving blade 22 and also includes a moving mechanism 30 of the cutter unit 20. As a result, when the packaging film 3 is cut in the lateral direction, cutting of the opening picking portion 16 can be easily avoided at low cost without replacing the rotary blade 21 or the receiving blade 22, and the opening picking portion 16 can be easily avoided. It is possible to improve the work efficiency related to the change of the forming position.

More specifically, since the cutter unit 20 itself can be moved by the moving mechanism 30, precise movement adjustment when the moving target is a small member and a complicated mechanism for the movement are unnecessary, and moreover. It is not necessary to prepare a replacement rotary blade 21 or a receiving blade 22.

Further, the moving mechanism 30 can adjust the amount of movement of the frame 31 on which the rotary blade 21 or the receiving blade 22 is supported, the support member 32 that supports the frame 31 so as to be movable in the lateral direction, and the frame 31 with respect to the support member 32. It has an adjusting mechanism 33. As a result, the rotary blade 21 and the receiving blade 22 can be collectively moved while maintaining the positional relationship with each other. Therefore, it is not necessary to realign the rotary blade 21 and the receiving blade 22, and the relief groove 47 is provided in the opening knob 16 by a simple operation of operating the adjusting mechanism 33 according to the specifications of the packaging film. It can be easily matched.

Further, the cutter unit 20 has a servomotor 46 that independently rotates and drives the rotary blade 21 via a drive shaft 44 connected to the shaft portion 23a of the rotary blade 21. By providing the servomotor 46, it is possible to independently control the rotation cycle of the rotating drum 23 and the cutting cycle of the packaging film 3 that is 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 with the movement of the cutter unit 20, it is possible to further improve the work efficiency related to the change of the forming position of the opening knob portion 16.

Although the description of one embodiment of the present invention has been completed above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit 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.
Further, 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 the receiving blade 22 described above, a moving blade and a fixed blade having different configurations may be provided.

3 Packaging film 10 Packaging film cutting device 13, 14 Feeding roller (feeding unit)
16 Opening picking part 11 Edge cutter (Opening picking unit)
12 Receiving roller (opening picking unit)
20 Cutter unit 21 Rotary blade (moving blade)
22 Receiving blade (fixed blade)
23a Shaft 30 Movement mechanism 31 Frame 32 Support member 33 Adjustment mechanism 44 Drive shaft 46 Servo motor 47 Relief groove

Claims (3)

A feeding unit that feeds out a strip-shaped packaging film in the longitudinal direction,
An open-picking forming unit that forms a tongue-shaped opening-picking portion at a predetermined position of the packaging film unwound by the feeding unit.
The moving blade and the fixed blade, which are provided on the downstream side of the opening pick forming unit and face each other across the packaging film, cooperate to cut the packaging film laterally at the forming position of the opening picking portion. Equipped with a cutter unit
The cutter unit is
A relief groove formed on at least one of the moving blade and the fixed blade to avoid cutting the opening knob when cutting the packaging film.
A packaging film cutting device having a moving blade and a moving mechanism for moving the fixed blade in the lateral direction so as to match the relief groove with the opening knob portion. The moving mechanism
A frame on which the fixed blade and the moving blade are supported,
A support member that movably supports the frame in the lateral direction, and
The packaging film cutting device according to claim 1, further comprising an adjusting mechanism that makes it possible to adjust the amount of movement of the frame with respect to the supporting member. The moving blade is a rotary blade, and the fixed blade is a receiving blade of the rotary blade.
The packaging film cutting device according to claim 1 or 2, wherein the cutter unit has a servomotor that independently rotates and drives the rotary blade via a drive shaft connected to a shaft portion of the rotary blade.

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