JPH11165719A - Method and device for cutting thin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cutting a thin material and a cutting apparatus capable of cutting safely and surely, wherein feeding of the thin material after cutting is secure, and which can perform stable operation. SOLUTION: In this cutting apparatus for cutting a thin material of a film SF low in rigidity, a pair of rolls 76, 70 which are disposed so as to be opposed to each other, are provided between a pair of transfer rolls 80, 82, to which speed differences are imparted, and a pair of driving rolls 81, 83. A cutting blade 77 is provided on one upper side roll 76, and a groove 75, which allows the cutting blade 77 to enter, is provided in the other lower side roll 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a thin material such as a film used for shrink packaging of a packaging machine.

[0002]

2. Description of the Related Art Conventionally, for a shrink wrapping of a beverage can 2 or the like as shown in FIG. 7, a thin rigid shrink film 1 cut into an appropriate size by a cutting device has been used. (A) shows a packaging example of four cans, and (b) shows a packaging example of six cans. Here, the shrink film 1 wrapping the can 2 is a very thin film having a thickness of about 0.05 mm, and a handle 5 for carrying is provided on the upper surface of the film 1.

FIGS. 8A and 8B show an example of an apparatus for performing such shrink packaging, wherein FIG. 8A is a side view and FIG. The shrink packaging device,
As shown in FIG. 8A, the supply conveyor 1 for transporting the can 2
0, a film packaging (sleeve packaging) machine 30, a shrink tunnel 40 and a handle 50. In the shrink wrapping apparatus, as shown in FIG. 8B, a group of cans 8 is conveyed on a supply conveyor 10 and is divided into a predetermined number on the way. On the other hand, the band-shaped shrink film SF as the packaging material is supplied from below the supply conveyor 10 and cut into a predetermined length. Then, a predetermined number of cans 2 are wound from below the can 2 to form the sleeve package 39. Do. Next, the can 2 in which the sleeve packaging 39 has been performed is sent to the joint block seal 41 of the shrink film 1 and the shrink tunnel 40, where it is shrink-wrapped. Thereafter, a tape-shaped handle 5 is attached to the upper surface of the shrink film 1 by a handle 50, and packaging of the cans 2 in a predetermined number is completed.

[0004] A method of cutting a film in an apparatus having such a packaging step and configuration will be described with reference to FIG. The belt-shaped shrink film SF supplied through the pass line holding roll 34 is sent to the vacuum belt 35 by a pair of upper and lower feed rolls 26 and 28. This vacuum belt 35
Is stretched between a driving roll 29 and a driven roll 36, and a pressing roll 27 is disposed above the driving roll 29. Further, a cutting roll 31 having a cutting blade 99 is provided at an intermediate position between the feed roll 28 and the driving roll 29. When the film SF is sent to a predetermined length by the vacuum belt 35, the cutting roll 31
Rotates to cut the film SF. The cut film 1 is sent by a vacuum belt 35 below the can 2 located between the supply conveyor 10 and the conveyor 11. The leading end of the film 1 is transferred to the conveyor 11 by the movement of the can 2, and is peeled off by the vacuum belt 35. Then, Flight Bar 45
The film 1 is wound around the can 2 and the sleeve packaging 39 is performed by the rotation of.

Next, a method and steps for cutting the film will be described in detail with reference to FIG. In FIG. 10, (a) shows the state before the start of the cutting, (b) shows the state during the cutting, and (c) shows the state after the completion of the cutting. In the case where the running film SF is cut by one cutting blade 99, cutting is not possible due to low rigidity unless tension is applied to the film. Therefore, in order to cut the film SF, it is necessary to generate tension by changing the speed of the feed roll 28 and the drive roll 29 of the vacuum belt 35. Therefore, the feed roll 28
And each of the drive rolls 29 has a motor M1,
M2 is provided, these motors M1, M2, the drive roll 29 is rotated at a speed v _2, and rotates the feed roll 28 at a speed v ₁ caused the tension (v _2>
v ₁ ). The cutting roll 31 is rotated by the motor M3, and the cutting blade 99 is set so as to bite into the film path line by a depth h. P indicates the distance between the center of the feed roll 28 and the center of the drive roll 29.

[0006]

However, in such a conventional cutting method, if the film tension is uniform in the width direction of the film, the film can be cut. If it is insufficient, a cutting error is likely to occur. Further, since the film to be cut has low or no rigidity, the subsequent film SF after cutting cannot enter between the pressing roll 27 and the driving roll 29 of the vacuum belt 35, and the film is likely to be clogged. Therefore, there was a drawback that stable operation was not possible.

In addition to such an unstable cutting method, FIG.
1 and FIG. 12. FIG.
(A) is a perspective view of a cutting blade of a cutting device to be used, FIG.
(B) is a side view showing a cutting state, and FIG. 12 is an explanatory view of another cutting method. The cutting method in FIG.
A fixed blade 61 mounted on the holder 60 and a rotary blade 63 mounted on the holder 62 are used. The rotary blade 63 is provided at a position eccentric from directly above the fixed blade 61, and the film 1 at the time of cutting is used. Is inclined. However, this cutting method is often used for paper or the like made of a material having high rigidity, but has a disadvantage that it is difficult to cut a material having low rigidity such as a film. In addition, the film 1 after cutting
However, there is a drawback that the film feed becomes difficult because of the contact with the fixed blade 61. FIG. 12 shows a cutting configuration similar to that of FIG. 10, but in this cutting method, a heater (impulse heater, heating heater, etc.) 95 is used instead of a cutting blade. However, this cutting method can easily cut the film 1 having low rigidity. However, there are concerns about maintenance problems of the heater 95, various problems in use such as welding of the film, fire and burns.

The present invention has been made in view of such circumstances, and its object is to perform safe and reliable cutting.
Moreover, it is an object of the present invention to provide a method and an apparatus for cutting a thin material, which can surely feed the thin material after the cutting and perform a stable operation.

[0009]

In order to solve the above-mentioned problems of the prior art, according to the present invention, in a cutting device for cutting a thin material having low rigidity, a pinch roll provided with a speed difference is provided. A pair of rolls are provided facing each other, and one of the rolls is provided with a cutting blade, and the other roll is provided with a groove portion into which the cutting blade can enter. Further, in the present invention, in a cutting method for cutting a thin material having low rigidity, a groove portion provided between pinch rolls provided with a speed difference, and one is provided with a cutting blade, and the other is a groove portion into which the cutting blade can enter. When cutting, a cutting blade arranged on one roll pushes the thin material into a groove arranged on the other roll, and cuts the thin material using the tension generated at this time. doing. further,
In the present invention, in a cutting device for cutting a thin material having low rigidity, a pair of rolls arranged opposite to each other is provided between driving rolls provided with a speed difference, and one of the rolls has a cutting blade and a plurality of cutting blades. A plurality of non-driven small-diameter rollers are provided, a groove portion on which the cutting blade can enter is provided on the other roll, and the two rolls are configured to rotate at the same speed in synchronization with each other.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIG. 1 is a configuration diagram of a cutting blade of a cutting device according to an embodiment of the present invention, FIG. 2 is a cutting process diagram, and FIG. 3 is a diagram of a shrink film applied to a cutting method according to an embodiment of the present invention. Fig. 2 shows an example of a cutting mechanism and a shrink packaging machine.

FIG. 1 is a configuration diagram showing a cutting apparatus according to an embodiment of the present invention, in which (a) is a front view and (b) is a side view. The cutting device according to the embodiment of the present invention is disposed in a film cutting device of a shrink wrapping machine, as described later, and is used when cutting a thin band-shaped shrink film SF having low rigidity. . For this reason, the cutting device of the present embodiment is provided between pinch rolls to be described later to which a speed difference is given.

The above-mentioned cutting device is provided with a pair of rolls 76 and 70 which are arranged to be opposed to each other at an interval vertically, and one of the rolls (the upper roll in FIG. 1) 76 is provided with a cutting blade 77. The other roll 70 (the lower roll in FIG. 1) is provided with a groove 75 into which the cutting blade 77 can enter. The cutting blade 77 and the groove 75 are provided over the entire width of the upper and lower rolls 76 and 70, respectively.
The cutting blade 77 is formed in a tapered wedge shape, and is provided so as to protrude radially from the outer peripheral surface of the upper roll 76. The groove portion 75 is formed in a U-shaped cross section with the outer peripheral surface side opened. The cutting blade 77 and the groove 75 are configured to be rotated in phase by the same gears 78 and 78 and a motor 79 which are provided on the side and mesh with each other. Note that the chain line in FIG. 1B indicates the locus K drawn by the cutting blade 77.

Next, a cutting step by the cutting method according to the embodiment of the present invention will be described with reference to FIGS. In the cutting method according to the embodiment of the present invention, the cutting device shown in FIG. 1 is used, and FIG.
Is being transported, and the cutting rolls 76 and 70 are stopped. (B) shows the start of cutting, and shows a situation in which the rolls 70 and 76 are starting to rotate. Here, the film SF is running along the groove 75 of the lower roll 70. (C) shows that the film is being cut, and the cutting blade 77 is
Is pressed into the groove 75 of the lower roll 70. FIG.
(D) shows a state in which the cutting rolls 76 and 70 are further rotated, and the cutting blade 77 and the groove 75 are at the lowest point. In this state, the pushing amount of the film SF becomes maximum,
The film SF is cut. Here, the film SF is restrained at the upper end edges on both sides of the groove 75, and the film SF pushed by the cutting blade 77 is extended by the amount of pushing. In other words, the film S
A tension is generated in F, and the film SF is easily cut by using this tension. FIG.
(E), (f), and (g) show the situation where the cutting rolls 70 and 76 further rotate, respectively.

The pre-cut film 1 is conveyed to the next step. After the subsequent film SF is further conveyed by a predetermined amount, the same cutting is repeated through the steps from FIG. According to this cutting method, it is possible to cut a thin, low-rigidity film easily, accurately and reliably.

FIG. 3 shows an example in which the cutting device according to the embodiment of the present invention is applied to the film cutting device of the shrink wrapping machine shown in FIG. 9, (a) is a side view thereof, and (b) is a plan view thereof. Is shown. The cutting device according to the embodiment of the present invention is disposed between the transport rolls 80 and 82 of the film SF and the drive rolls 81 and 83 of the vacuum belt 35,
The transport rolls 80 and 82 and the drive rolls 81 and 83 are configured as pinch rolls provided with a speed difference. Here, the transport roll 80 and the drive roll 81 are
It is designed to be driven by a motor 87. The film transport roll 80 is connected to a large gear 86 having a large number of teeth, and the vacuum belt driving roll 81 is connected to a small gear 85 having a small number of teeth.
Are in mesh with each other via an intermediate gear 84,
1 is configured to rotate quickly with respect to the transport roll 80.

As a result, tension is generated in the film SF between the transport roll 80 and the drive 81, and the film SF is easily cut. On the other hand, the cutting rolls 70 and 76 are shown in FIG.
And the motor 79 via the gear 78,
Since it rotates at the same speed and only when cutting,
Does not affect film transport. By using the cutting device having such a configuration, the film SF being conveyed can be easily cut at an arbitrary position.

FIG. 4 is a structural view of a cutting blade of a cutting apparatus according to another embodiment of the present invention, FIG. 5 is a cutting process diagram, and FIG. 6 is applied to a cutting method according to another embodiment of the present invention. 1 shows an example in which the present invention is incorporated in a shrink wrapping machine. FIG. 4 is a configuration diagram showing a cutting device according to the embodiment of the present invention. The cutting device according to the embodiment of the present invention is provided in the film cutting device portion of the shrink wrapping machine and used for cutting the thin rigid shrink film 1 similarly to the above-described invention. It is. For this reason, the cutting device of the present embodiment is provided between driving rolls to be described later to which a speed difference is given.

In the above cutting device, the film feed roll 2
A cutting mechanism is provided between the driving roll 29 and the driving belt 29 of the vacuum belt 35, and the cutting mechanism includes a pair of rolls 100 and 105 arranged to face each other. One of the rolls (the upper roll in FIG. 4) 100 has a cutting blade 10
One and a plurality of film feed rollers (non-driven small-diameter rollers) 102 are provided, and the other roll (the lower roll in FIG. 4) 105 has a groove 104 into which the cutting blade 101 can enter.
Is provided. The cutting blade 101 is formed in a tapered wedge shape, and is provided so as to protrude substantially tangentially from the outer peripheral surface of the upper roll 100. Film feed roller 10
2 is disposed at intervals along the periphery of the upper roll 100, and combined with the lower roll 105, the subsequent film SF
It is installed to hold the. The groove portion 104 is formed in a U-shaped cross section with the outer peripheral surface opened. Also,
The cutting blade 101 and the groove 104 are configured to be rotated in phase synchronization by a gear and a motor, which will be described later, provided on the side. Moreover, the diameter of the lower roll 105 and the cutting edge diameter of the cutting blade 101 are formed to be the same. A chain line 103 in the drawing indicates a locus drawn by the cutting edge of the cutting blade 101. Further, between the cutting mechanism and the vacuum belt 35, a vacuum belt holding roll 1 is provided.
A roll 10 supports the film 1 to prevent the cut film 1 from falling. Note that press rolls 26 and 27 are disposed above the feed roll 28 and the drive roll 29.

The cutting step by the cutting method according to the embodiment of the present invention will be described with reference to FIGS. In the cutting method according to the embodiment of the present invention, the cutting device shown in FIG. 4 is used. FIG. 5A shows a state in which the shrink film SF is being conveyed, and is conveyed by the feed roll 28 and the vacuum belt 35. . At this time, the lower cutting roll 105 and the cutting blade 101 have stopped rotating. FIG. 5B shows a state in which the cutting is being performed. The lower cutting roll 105 and the cutting blade 101 rotate synchronously, and the cutting is performed while pushing the film SF into the groove 104 with the cutting edge of the cutting blade 101. And the cutting blade 101
The film SF is cut at the lowest point where the pushing amount of the film becomes maximum. This cutting principle will be described below. The film SF is constrained by the upper edge portions on both sides of the groove 104, and the cutting blade 1
01, the film SF pushed into the groove 104 is
It will be extended by the amount of pushing. That is, tension is generated in the film SF in the groove 104, and the film SF is easily cut by using this tension.

FIG. 5C shows the state of film feeding. The cut preceding film 1 is conveyed to the next process by the vacuum belt 35, and the subsequent film SF
Is fed to the vacuum belt 35 while being sandwiched between the lower roll 105 and the film feed roller 102. Here, the speed of the lower roll 105 is
8 is set slightly faster than the speed. Further, the film feed roller 102 is provided as an idler roller, and rotates at the same speed as the lower roll 105. For this reason, the subsequent cut film SF is reliably fed to the vacuum belt 35 by the film feed roller 102 and is conveyed. According to this cutting method, it is possible to easily and accurately cut a thin and weak rigid film.

FIG. 6 is a plan view showing a driving mechanism of the cutting device. In the cutting device according to the embodiment of the present invention, the feed roll 28 and the driving roll 2 of the vacuum belt 35 are provided.
9 is configured to be rotated by a motor 87 via gears 84, 85, 86. Here, presser rolls 26, 2
7 and the vacuum belt holding roll 110 are not driven. The gears 85 and 86 are set so that the gear ratio is changed so that the driving roll 29 of the vacuum belt 35 becomes slightly faster. The cutting blade 101 is attached to the upper roll 100, and the upper roll 100
Is configured to be rotated by a motor 79.
The upper roll 100 and the lower roll 105 are configured to rotate synchronously via a gear 115.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical idea of the present invention. is there. For example, in the embodiment of the present invention, the shrink film SF is cut. However, the present invention can be applied to cutting of thin paper having low rigidity.

[0023]

As described above, the thin material cutting apparatus according to the present invention cuts a thin material having low rigidity, and is arranged between pinch rolls provided with a speed difference so as to face each other. A pair of rolls is provided, and one of the rolls is provided with a cutting blade, and the other roll is provided with a groove through which the cutting blade can enter, so that even a thin, low-rigidity film or the like can be easily and accurately and reliably. Can be cut. Further, the method for cutting a thin material according to the present invention is for cutting a thin material having low rigidity, provided between pinch rolls provided with a speed difference, and one includes a cutting blade,
The other uses a pair of rolls provided with a groove into which the cutting blade can enter, and when cutting, the cutting blade arranged on one roll pushes the thin material into the groove arranged on the other roll, and the tension generated at this time Since the thin material is cut using the method, the thin material can be cut safely and reliably, and the thin material after the cutting can be reliably fed to perform a stable operation. Furthermore, the thin material cutting device according to the present invention is a cutting device for cutting a thin material having low rigidity, wherein a pair of rolls arranged opposite to each other are provided between drive rolls provided with a speed difference, A cutting blade and a plurality of non-driving small-diameter rollers are provided on one roll, and a groove is provided on the other roll where the cutting blade can enter, and the two rolls are configured to rotate at the same speed in synchronization. Therefore, similarly to the above-described invention, it is possible to easily and accurately cut even a thin film having low rigidity and the like.

[Brief description of the drawings]

FIG. 1 shows a cutting device according to an embodiment of the present invention, in which (a) is a front view and (b) is a side view.

2A and 2B show a process of cutting the shrink film using the cutting device of FIG. 1, wherein FIG. 2A is a conceptual diagram of a shrink film being conveyed, FIG. 2B is a conceptual diagram at the start of cutting, and FIG. The conceptual diagram in the middle, (d) is a conceptual diagram in which the cutting blade and the groove portion are at the lowest point position, (e) is a conceptual diagram in which the cutting roll rotates, and (f) is a conceptual diagram in which the cutting roll further rotates. (G) is a conceptual diagram of a situation in which the cutting roll further rotates.

FIG. 3 is an example in which the cutting device according to the embodiment of the present invention is applied to a film cutting device of a shrink wrapping machine;
(A) is the side view, (b) is the top view.

FIG. 4 is a side view showing a cutting device according to another embodiment of the present invention.

5A and 5B show a process of cutting the shrink film using the cutting device of FIG. 4, wherein FIG. 5A is a conceptual diagram of the shrink film being transported, FIG. 5B is a conceptual diagram of the shrink film being cut, and FIG. It is a conceptual diagram of a situation.

FIG. 6 is a plan view showing a driving mechanism of the cutting device in FIG.

FIGS. 7A and 7B show a state in which beverage cans and the like are shrink-wrapped. FIG. 7A is a perspective view of an example of four cans, and FIG. 7B is a perspective view of an example of six cans.

FIGS. 8A and 8B show a conventional example of an apparatus for performing shrink wrapping, in which FIG. 8A is a side view and FIG.

FIG. 9 is a conceptual diagram illustrating a method of cutting a film in the apparatus of FIG.

10 shows a step of cutting the shrink film using the cutting apparatus of FIG. 8, (a) is a conceptual diagram before starting cutting,
(B) is a conceptual diagram during cutting, and (c) is a conceptual diagram when cutting is completed.

11A and 11B show another conventional cutting device, wherein FIG. 11A is a perspective view of a cutting blade, and FIG. 11B is a side view of a cutting state.

FIG. 12 is a side view showing still another conventional cutting device.

[Explanation of symbols]

 1 Cut Shrink Film 35 Vacuum Belt 70 Lower Roll 75 Groove 76 Upper Roll 77 Cutting Blade 78 Gear 79 Motor 80, 82 Transport Roll 81, 83 Driving Roll 84, 85, 86 Gear 87 Motor 100 Upper Roll 101 Cutting Blade 102 Film feed roller 104 Groove 105 Lower roll 110 Roll for holding vacuum belt SF Shrink film

Claims (3)

[Claims] 1. A cutting device for cutting a thin material having low rigidity, wherein a pair of rolls arranged opposite to each other is provided between pinch rolls provided with a speed difference, and a cutting blade is provided on one of the rolls. And a groove for allowing the cutting blade to enter the other roll. 2. A cutting method for cutting a thin material having low rigidity, wherein said cutting method is provided between pinch rolls provided with a speed difference, and one is provided with a cutting blade, and the other is provided with a groove through which said cutting blade can enter. Using a pair of rolls, a cutting blade arranged on one roll presses the thin material into a groove arranged on the other roll at the time of cutting, and cuts the thin material using the tension generated at this time. A method for cutting thin materials, characterized in that: 3. A cutting device for cutting a thin material having low rigidity, wherein a pair of rolls arranged opposite to each other is provided between drive rolls provided with a speed difference, and one of the rolls has a cutting blade and a plurality of rolls. A plurality of non-driven small-diameter rollers, a groove for allowing the cutting blade to enter the other roll is provided, and the two rolls are synchronously rotated at the same speed. apparatus.