JPH07246591A - Method and device for cutting plastic film - Google Patents

Abstract

PURPOSE:To provide a cutting method for a shear cutting system and its device which enable positive shear cutting and to facilitate the setting to an optimum cutting state and to enhance reproducibility. CONSTITUTION:A shear cutter 6 is slightly inclined. Substantial point contact is applied to the shear cutter 6 at the point E at the uppermost stream side in the film running direction at the overlapping region 7 to a receiving cutter 5. A film 1 is cut by shearing at the point contact position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cutting a plastic film, and more particularly to an improvement of the cutting method and apparatus in a shear cut system.

[0002]

2. Description of the Related Art For example, in a slitter for cutting a wide plastic film into a film having a predetermined width,
A cutting method called a so-called shear cut method may be used to cut the film during running.
In this shear cut method, as shown in FIGS. 9 and 10, the rotating disc-shaped shear blade 102 (upper blade) is pressed against the rotating disc-shaped receiving blade 101 (lower blade) from the side surface, and the over-cutting of both blades is performed. This is a method of cutting the plastic film 104 running in the lap area 103 by shearing. Blade 10
1 is normally driven to rotate, and the shear blade 102 is normally supported to be free to rotate.

In such a shear-cut type cutting device, the receiving blade 101 is normally only capable of adjusting the position in the width direction of the film, and its posture is kept constant. Further, in order to adjust the position and the posture of the shear blade 102 with respect to the receiving blade 101, for example, a mechanism as shown in FIGS. 11 to 13 is provided.

In FIG. 11, the film 104 is run from the lower side to the upper side in a direction perpendicular to the paper surface. The shear blade 102 is pressed against the receiving blade 101 whose position is set on the receiving blade shaft 105 with a predetermined pressing force.
The shear blade 102 is a cutter shaft 10 that is rotatably supported.
6 is fitted via a holder 107, and the pressing force is applied by, for example, a disc spring 108. Bearing 10
9 to the bearing holder 110 that holds the outer ring side of the shaft A1.
11 is fixed, and the position of the shaft A111 is adjusted in the arrow C direction by the adjusting nut 112. By this adjustment, the shear blade 102 is pressed against the receiving blade 101. Reference numeral 113 is a lock bolt. The shaft B114 is supported by a suitable fixing bracket 115 so that its position can be adjusted in the direction of arrow D, and is adjusted in that direction by an adjusting nut 116. By this adjustment, the shear blade 102 is adjusted toward and away from the receiving blade 101, and the amount (depth) of the above-described overlap region 103 is determined. Reference numeral 117 is a lock bolt, and 118 is a fixing flange.

As shown in FIGS. 12 and 13, the shaft B114 is fitted in a fixing bracket 115 and a fixing flange 118 so as to be slidable in the axial direction, and fixed to the shaft B114 via a key 119. Relative rotation between the flanges 118 is prevented. Fixing flange 118
Is attached to the fixing bracket 115 via the fixing bolt 120.
However, since the bolt hole 121 is formed in an arc-shaped long hole, the fixing flange 118 can be adjusted to a slight angle in the rotation direction with respect to the fixing bracket 115 (reference member). There is. Since this angle adjustment also serves as the angle adjustment in the rotation direction of the shaft B via the key 119,
After all, by this angle adjustment, the inclination angle θ of the shear blade 102 with respect to the receiving blade 101 can also be adjusted.

[0006]

In the shear cutting type cutting apparatus as described above, the sharpness of the plastic film is determined by the relative posture (contact state) of the shear blade 102 with respect to the receiving blade 101, for example, by the inclination angle θ. Changes. There are the following problems with this inclination angle θ.

First, in the conventional cutting technique, what kind of inclination angle θ is optimum is not fully understood. Therefore, one shear blade for each machine and each blade set
02 and the receiving blade 101 are different in contact state, and there is a problem that a blade set having good sharpness and blade life and a blade set having poor contact state are generated. In addition, even if the blade set is good, there is no guarantee that the blade can be set to the good state again after adjusting the posture and the position. That is, the reproducibility is poor.

Further, the shear blade 102 and the receiving blade 101 are
Actually, as shown in FIG. 10, each has a predetermined clearance angle in the blade thickness direction. Therefore, when the inclination angle is 0, the shear blade 102 theoretically has two points, the upstreammost point E and the downstreammost point F in the film traveling direction of the overlap area 103 (FIG. 9). You will be contacted at. If these two points are surely in contact with each other, theoretically no particular problem occurs in cutting due to shearing.

However, in general, when mounting the device, assembling it,
There may be some errors and rattling on the adjustment, so
Make sure all blade sets contact at 2 points as above
In reality, it is extremely difficult to apply a predetermined pressing force to both points. Therefore, the angle of the shear blade 102 with respect to the receiving blade 101 varies in both directions (directions of inclination angle ±). In particular, when the film is inclined in the direction in which it contacts only at the most downstream point in the traveling direction, the target shear cutting becomes difficult and the film is torn and cut in the overlap region 103. In such a state, it becomes the same state as the sharpness of the blade,
Cutting powder is likely to be generated and adheres to the product film, which may cause product defects such as inclusion of foreign matter.

If the cutting by shearing is not performed well, a deformed portion 104b locally rising in the thickness direction of the film 104 often occurs on the cut end surface 104a of the film 104 as shown in FIG. 14, for example. When the cut film 104 is rolled into a roll, the deformed portion 104a is laminated and forms a raised portion at the end of the film roll, which is a cause of a winding defect of the film product roll, which is so-called "edge height". Becomes

Further, as a problem peculiar to the above-mentioned conventional apparatus, there are the following problems. In the above-described conventional device, the fixing bolt 120 is loosened, the fixing flange 118 is finely adjusted in the rotational direction, and the fixing bolt 120 is tightened again, so that the key 119 and the shaft B11 engaging with the key 119.
It is possible to adjust the inclination angle of the shear blade 102 with respect to the receiving blade 101 via 4.

However, in reality, the key 119 and the keyway 1
Since there is a play (play) x between 19a and 19a, the play appears as an error or variation in setting the angle of the shear blade 102, which causes a problem that the target angle cannot be set accurately. Further, since the adjustment angle varies by the amount corresponding to the play, the angle θ to be set has no reproducibility.

Further, as compared with the radius r of the axis B114, the axis B1
Since the distance R from the center of 14 to the shear blade 102 is considerably larger, the backlash x at the key 119 portion is greatly amplified to X at the shear blade 102 portion, and the shear blade inclination angle error is correspondingly increased. There is also the problem of large variations.

Further, although the object to be adjusted is the angle of the shear blade 102 located at the position separated by the distance R, the actual adjustment is the angle adjustment of the small radius r or a portion close thereto, so that the fine adjustment is performed. There is also a problem that it is extremely difficult to set an accurate target value.

In view of various problems in the prior art as described above, the present invention provides a method and an apparatus capable of surely cutting by shearing without tearing the film in shear-cut type film cutting, It is intended to prevent the inclusion of foreign matter such as cutting powder and the occurrence of a high edge phenomenon when the film is wound into a roll.

It is another object of the present invention to provide a cutting method and a cutting device which can easily set an optimum cutting state and can easily secure reproducibility to the optimum state.

[0017]

According to the method for cutting a plastic film of the present invention which meets the above object, a rotating disk-shaped receiving blade is provided with a rotating disk-shaped shear blade, and both blades partially have an overlapping region. When the plastic film running between the two blades is cut by shearing in the overlap area, the shaft center of the shear blade is slightly tilted with respect to the shaft center of the receiving blade, and the shear blade and the receiving blade are pressed against each other. The method is characterized in that a point contact is made substantially on the most upstream side of the overlap region in the film running direction, and the film is cut at the point contact portion.

The axis of the blade is fixed in a direction orthogonal to the running direction of the plastic film, and the axis of the shear blade is adjusted in a direction slightly inclined with respect to the axis of the blade. It The angle θ of the shear blade with respect to the receiving blade is 0 °
<Θ ≦ 1 ° is preferably adjusted, and more preferably 0 ° <θ ≦ 0.5 °.

Further, in the plastic film cutting device according to the present invention, the rotating disk-shaped receiving blade is pressed against the rotating disk-shaped shear blade so that both blades partially have an overlap region, and In a plastic film cutting device that cuts a plastic film running on a sheet by shearing in the overlap region, the shear blade supporting means is provided with a shear blade angle adjusting mechanism for inclining the axis of the shear blade with respect to the axis of the receiving blade. It consists of things that are characterized.

Further, in the plastic film cutting device according to the present invention, the rotating disk-shaped receiving blade is pressed against the rotating disk-shaped shearing blade so that both blades partially have an overlapping area, and In a plastic film cutting device that cuts a plastic film running on a sheet by shearing in the overlap region, a shear blade angle adjusting mechanism for inclining the shear blade axis with respect to the axis of the receiving blade is provided in the shear blade supporting means. At the same time, the cutting device is provided with an angle detection device for detecting the adjusted angle of the shear blade.

In the above cutting device, the axis of the receiving blade is fixed in the direction orthogonal to the running direction of the plastic film. Further, the shear blade angle adjusting mechanism is configured to adjust the axial direction of the shear blade in a plane parallel to the axial center of the receiving blade. Further, the angle detection device is supported so as to be able to approach and separate from the shear blade in a direction along the axis of the shear blade, for example.

The shear blade angle adjusting mechanism includes, for example, an axis A extending in the axial direction of the shear blade, an axis B extending from the axis A in a direction orthogonal to the axis A, and an axis B from the axis B. It has an arm extending in the orthogonal direction and an arm angle adjusting mechanism for adjusting the angle around the axis B of the arm.

The distance from the center of the axis B of the arm angle adjusting mechanism is preferably larger than the distance from the center of the axis B of the shear blade.

[0024]

In such a plastic film cutting method, the shear blade is forcibly tilted slightly with respect to the receiving blade, and is point-contacted on the most upstream side in the film running direction in the overlapping region of both blades. The film being run is cut by shearing. Since the two blades are substantially in point contact with each other, there is no possibility that a gap will be formed between the two blades at the point on the most upstream side, and the cutting is surely performed by shearing at this point portion. Further, since this point portion is located at the most upstream side in the film running direction in the overlapping region of the two blades, there is no possibility that the film cut reliably at this point portion will be torn off at the downstream side thereof.

The reliable cutting at the most upstream portion suppresses the generation of cutting powder and the like, and suppresses the inclusion of foreign matter into the film. In addition, by performing shear cutting reliably,
It is possible to prevent local swelling (locally deformed portion in the thickness direction) from occurring on the cut end surface of the film, and to prevent the occurrence of a high edge phenomenon when the cut film is wound into a roll.

The above cutting method can be easily carried out by using the cutting device according to the present invention. In the cutting device according to the present invention, since the shear blade angle adjusting mechanism for adjusting the inclination of the axis of the shear blade with respect to the axis of the receiving blade is provided, the cutting blade with respect to the receiving blade as described in the above cutting method is provided. If the optimum posture (optimal inclination angle) of the shear blade is known, it is possible to positively and easily adjust to the target posture.

Since this shear blade angle adjusting mechanism is a dedicated mechanism for performing the above-mentioned adjustment, it is easy to design and does not employ the above-mentioned key and key groove mechanism which cause rattling at the time of adjustment. It can be a mechanism and can guarantee the accuracy of the adjustment.

If the cutting device is provided with an angle detecting device for detecting the adjusted angle of the shear blade, it can be confirmed whether the adjusted angle is exactly the target angle or not, and the accuracy of the setting can be improved. , The certainty is further improved.

Further, if the shear blade angle adjusting mechanism is constructed to have the arm extending from the axis B and the arm angle adjusting mechanism as described above, the shear blade angle adjusting mechanism can be adjusted easily and accurately by simply adjusting the arm angle. The inclination angle with respect to the blade can be adjusted, which improves the accuracy and reproducibility of the set angle.

Furthermore, if the length of the arm is increased and the distance from the center of the axis B of the arm angle adjusting mechanism is increased, the adjustment allowance in the arm angle adjusting mechanism corresponding to the tilt angle adjusting allowance of the shear blade. Can be made relatively large, and fine adjustment can be facilitated accordingly. as a result,
Adjustment accuracy and reproducibility are further improved.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method and apparatus for cutting a plastic film of the present invention will be described below with reference to the drawings. 1 to 8 show a plastic film cutting apparatus according to an embodiment of the present invention, in which the present invention is applied to a slitter for cutting a wide plastic film into a predetermined width and winding the roll into a roll. Shows. The method and apparatus of the present invention are not limited to slitters, and can be applied to any apparatus having a shear-cut type cutting device that cuts a plastic film by shearing.

FIG. 1 shows a part around the cutting device of the plastic film slitter. The plastic film 1 is conveyed between the guide rolls 2 and 3 from the lower side to the upper side in the drawing. This guide roll 2, 3
A shear-cut type cutting device 4 according to the present invention is provided therebetween.

The cutting device 4 is normally provided with a plurality of disc-shaped receiving blades 5 which are rotationally driven by a motor or the like, and a circle which is pressed against the receiving blades 5 so as to partially have an overlapping area 7 from the side surface. A plate-shaped shear blade 6 is provided. Double-edged 5,
The film 1 traveling between 6 is cut by shearing in the overlap region 7.

As shown in FIG. 2, the receiving blade 5 includes a film 1
It is fixed on a receiving blade shaft 5b extending in a direction parallel to the position adjusting blade in a direction along the shaft 5b. Therefore, the axis 5a of the receiving blade 5 is fixed in the direction orthogonal to the traveling direction of the film 1.

The shear blade 6 is supported by the cutter shaft 9 via the holder 8 and is biased by the disc spring 10 incorporated in the holder 8 so as to be pressed against the side surface of the receiving blade 5. . The axis 6a of the shear blade 6 coincides with the axis of the cutter shaft 9. The cutter shaft 9 is rotatably held in a bearing holder 12 by a bearing 11.

The bearing holder 12 has the holder 12
Axis A13 is fixed concentrically with. The shaft A13 is slidably fitted in a bearing portion 15 formed at one end of a shaft B14 extending in a direction orthogonal to the shaft A13 in the axial direction of the shaft A13. The axis A13 is constrained with respect to its own rotation direction by, for example, a key and a key groove mechanism (not shown), and only the above sliding operation is permitted.
A screw 16 is engraved on the end of the shaft A13, and an adjusting nut 17 is screwed onto the screw 16. By rotating the adjusting nut 17, the position of the shaft A13 and thus the shear blade 6 is adjusted in the direction of arrow C. Reference numeral 18 indicates a lock bolt.

The axis B14 is attached to the fixed bracket 19 by an arrow D.
It is supported so that its position can be adjusted in any direction. The fixing bracket 19 is installed, for example, on the base 20 (shown in FIG. 4).

A screw 21 is engraved at the end of the shaft B14, and an adjusting nut 22 is screwed onto this screw 21.
The adjustment nut 22 is inserted into the U-shaped groove of the fixed bracket 19, and its position is restricted in the axial direction of the shaft B14. By rotating the adjusting nut 22, the shaft B1
The position of the shear blade 6 is adjusted in the direction of arrow D.

A shear blade angle adjusting mechanism 24 as shown in FIG. 3 is provided on the side surface of the fixed bracket 19. In the present embodiment, the mechanism 24 has a pair of arms 25a and 25b protruding and extending in a direction substantially parallel to the axis A13. One arm 25b is integrally formed with a flange member 27 fixed to the fixing bracket 19 via a bolt 26, and the other arm 25a is fixed to the flange member 27. A spacer member 28 is fixed to the ends of the pair of arms 25a and 25b opposite to the flange member 27, and the distance between the arms 25a and 25b is maintained at a predetermined constant value.

An arm 30 extending in the direction orthogonal to the axis of the shaft B14 is attached to the end surface of the shaft B14 via a bolt 29.
Is fixed. Therefore, by rotating the arm 30, the shaft B14 is rotated, and finally the relative inclination angle θ of the shear blade 6 with respect to the receiving blade 5 via the axis A13, the cutter shaft 9, etc. (FIG. 4) is adjusted. As shown in FIG. 4, this inclination angle θ coincides with the inclination angle of the shaft center of the cutter shaft 9 (that is, the shaft center of the shear blade 6) with respect to the shaft center of the receiving blade 5. Further, by the above rotation, the direction of the shaft center 6a of the shear blade 6 is adjusted in a plane parallel to the shaft center of the receiving blade 5.

The pair of arms 25a and 25b are respectively provided with adjusting bolts 31a, whose tip can contact the arm 30.
31b is screwed together. Adjustment bolts 31a, 31b
The tip of each of the counterbore 32a, 32
It comes into contact with the seat surface of b. Therefore, each adjustment bolt 31
More precisely, if one of the adjusting bolts is loosened by rotating a and 31b and the other adjusting bolt is tightened, the arm 30 is rotated.

Compression springs 33a and 33b are mounted around the adjusting bolts 31a and 31b and between the arm 30 and the arms 25a and 25b, respectively. One end of each compression spring 33a, 33b has a counterbore 32 for the arm 30.
a, 32b is abutted on each seating surface, and the other end is on each arm 25a,
The seats 34a, 34b provided on the inner surface side of 25b are in contact with the respective seat surfaces. Each compression spring 33a, 33b
The arm 30 is biased in the rotating direction with respect to each of the arms 25a and 25b. Note that 35a and 35b are lock nuts.

A pointer 36 extending in the arm extension direction is provided at the tip of the arm 30 so that the pointer 36 can be rotated integrally with the rotation of the arm 30 about the axis of the axis B14. Has become. In addition, the spacer member 28
A scale 37 is engraved or affixed on the display so that the amount of rotation of the pointer 36 (the amount of rotation of the arm 30) can be read.

As described above, since the tilt angle θ of the shear blade 6 with respect to the receiving blade 5 can be finally adjusted by rotating the arm 30, the shear blade in the present invention can be operated by the above-described series of mechanisms. The angle adjusting mechanism 24 can be configured.
In the shear blade angle adjusting mechanism 24,
That is, it is preferable that the distance r'from the center of the axis B14 of the adjusting bolts 31a and 31b is larger than the distance R from the center of the axis B14 of the shear blade 6.

In the present embodiment, as shown in FIG. 5, an angle detecting device 38 for detecting the adjusted angle of the shear blade 6 (angle of inclination with respect to the receiving blade 5) is further provided.

Although the angle detecting device 38 is constructed as a portable detecting device in the present embodiment as follows, it is a permanent device and approaches and separates from the shear blade 6 in the direction of the arrow in FIG. The device may be supported as much as possible.

In this embodiment, as shown in FIG. 6, a commercially available portable angle measuring device 39 (for example, a portable inclinometer "Angle Star" manufactured by Pasico Engineering Co., Ltd.)
On one surface, a jig 41 having a recess 40 into which the tip of the cutter shaft 9 can be inserted is fixed.
The angle detecting device 38 is configured as a portable type that can be carried around, and at the time of measuring an angle, the upper and lower tip surfaces 41 of the jig 41.
The a and 41b are brought into contact with the side surfaces of the shear blade 6 or the holder 8.

The portable angle measuring instrument 39 is capable of setting one surface thereof along a reference plane and setting the angle (posture) of the measuring instrument 39 at that time to an initial value 0. It is possible to measure the angle when the object is aligned, that is, the inclination angle of the object to be measured with respect to the reference plane. Therefore, for example, with the upper surface 20a (FIG. 4) of the base 20 forming a surface parallel to the axis 5a of the receiving blade 5 as a reference surface,
The lower surface 39a of the angle measuring device 39 is brought into close contact with the upper surface 20a to set the initial angle of 0, and the tip surfaces 41a and 41b of the jig 41 fixed to the surface perpendicular to the lower surface 39a are attached to the shear blade 6 or the holder. If it is brought into contact with the side surface of No. 8, the inclination angle of the shear blade 6 with respect to the plane perpendicular to the reference plane can be measured. Since the surface perpendicular to the reference surface and the extending surface of the receiving blade 5 are parallel,
After all, the inclination angle of the shear blade 6 with respect to the receiving blade 5 is detected by the above measurement.

Using the cutting device as described above, the method of the present invention is carried out as follows. Shear blade angle adjustment mechanism 24
The arm 30 is rotationally adjusted by the adjusting bolts 31a and 31b. More precisely, one adjusting bolt 31a
Loosen (31b) and adjust the other adjustment bolt 31b (31a)
By tightening, the arm 30 is rotated in either direction. At this time, by the compression springs 33a and 33b,
The state in which the arm 30 is free is prevented.

The axis B14 is rotated by the rotation of the arm 30, and the axis A13 fitted at the end of the axis B14 is rotated by the axis B13.
It is rotated around 14, and the inclination angle θ of the shear blade 6 concentric with the axis A13 with respect to the receiving blade 5 is adjusted.

As shown in FIG. 3, the adjusting bolts 31a,
Since the distance r ′ from the center of the axis B14 of 31b is larger than the distance R from the center of the axis B14 to the receiving blade 5, the adjustment amount by the adjusting bolts 31a and 31b is relative to the inclination angle θ of the shear blade 6. Is only slightly effective. In other words, the tilt angle θ is finely adjusted with high accuracy.

Moreover, the rotation amount of the arm 30 is determined by the scale 37.
Since the movement amount of the pointer 36 can be easily read with respect to, the adjustment can be performed with high accuracy and reproducibility, and as a result, the precision and reproducibility of the fine adjustment of the tilt angle θ of the shear blade 6 can be improved.

Further, whether or not the adjusted inclination angle θ of the shear blade 6 is accurately set to the target value is confirmed as follows. That is, the upper and lower tip surfaces 41a and 41b of the jig 41 of the portable angle detection device 38 are brought into contact with the side surfaces of the shear blade 6 or the holder 8 as shown in FIG. Angle measuring device 3
The reference angle 0 of 9 is set in advance with the upper surface 20a of the base 20 as the reference surface. In this setting, the shear blade 6 is parallel to the receiving blade 5, that is, the inclination angle 0 is set as the reference value 0. is there. Therefore, the abutment of the jig 41 allows the shear angle 6 of the shear blade 6 at that time with respect to the receiving blade 5 to be accurately measured. By this measurement, the above-mentioned adjustment accuracy is confirmed, and if it deviates from the set target value, readjustment is performed. As a result, the tilt angle θ is accurately and reproducibly set to the target value.

In this way, when the shear blade 6 is positively given the inclination angle θ with respect to the receiving blade 5, the arrow V in FIG.
When viewed from the II direction, the shear blade 6 slightly crosses the receiving blade 5, as shown in FIG. 7. However, in reality, as shown in FIG. 1, since the two blades 5 and 6 only overlap in the overlap area 7, the two blades do not interfere with each other.

Further, as shown in FIG. 8, the two blades 5 and 6 actually have clearance angles. Therefore, when the two blades 5 and 6 are perfectly parallel, theoretically, the point contact is made at two points of the overlap area 7 which are the point E on the most upstream side in the film traveling direction and the point on the most downstream side. Become. However, in the present invention, the shear blade 6 is positively provided with a slight inclination angle θ so that the point contact is made only at the point E on the most upstream side.

The film is cut by shearing at the point contact site at the point E on the most upstream side. Since the two blades 5 and 6 are in point contact with each other substantially at one point, there is no gap between the two blades at this portion. Therefore, the cutting at this portion becomes a complete shear cutting, which is extremely sharp, and an extremely reliable cutting state can be obtained.

Further, since this cutting portion is located on the most upstream side as viewed in the film running direction, if it is surely cut at this portion, a phenomenon such as tearing of the film on the downstream side thereof will not occur. Absent. Therefore, the generation of foreign matter due to cutting is suppressed, and the cut end surface of the film becomes extremely beautiful. In addition, since the cutting is performed by substantially complete shearing, it is possible to suppress the occurrence of local swelling in the thickness direction of the cut end surface, which causes the edge height phenomenon. Therefore, even when the cut film is wound in a roll shape, an extremely good winding shape can be obtained.

[0058]

As described above, according to the method and apparatus for cutting a plastic film of the present invention,
It is possible to surely realize cutting by shearing, to suppress the generation of cutting powder and the like to a minimum, and to make the cutting end face beautiful with very little local deformation. Therefore, when the cut film is wound into a roll, it is possible to obtain a roll product of excellent quality in which foreign matter is suppressed and a good winding shape in which the high edge phenomenon is suppressed.

In order to perform the above reliable shear cutting,
It is possible to accurately adjust and reproduce the optimum posture of the shear blade with respect to the receiving blade, which greatly contributes to the stabilization of production and the improvement of the product passing rate.

[Brief description of drawings]

FIG. 1 is a schematic side view of a plastic film cutting device according to an embodiment of the present invention.

2 is a cross-sectional view of the device of FIG.

3 is a partial front view of the device of FIG.

4 is a partial front view of the device of FIG.

5 is a partial front view of the device of FIG.

6 is a perspective view of the angle detection device of FIG.

FIG. 7 is a view on arrow VII in FIG.

FIG. 8 is an enlarged partial vertical cross-sectional view of the receiving blade and the shear blade of FIG.

FIG. 9 is a side view showing a general shear cut system.

10 is a longitudinal sectional view of the device of FIG.

FIG. 11 is a cross-sectional view of a conventional cutting device.

FIG. 12 is a partial front view of the device of FIG.

13 is a schematic partial front view of the device of FIG.

FIG. 14 is a cross-sectional view of a cut end surface of a film in which local deformation has occurred.

[Explanation of symbols]

 1 Plastic Film 2, 3 Guide Roll 4 Cutting Device 5 Receiving Blade 5a Receiving Blade Shaft Center 5b Receiving Blade Shaft 6 Shear Blade 6a Shear Blade Shaft Center 7 Overlap Area 8 Holder 9 Cutter Shaft 10 Spring 12 Bearing Holder 13 Axis A 14 axis B 17, 22 adjusting nut 19 fixing bracket 20 base 24 shear blade angle adjusting mechanism 25a, 25b arm 27 flange member 28 spacer member 30 arms 31a, 31b adjusting bolt 36 pointer 37 scale 38 angle detecting device 39 portable angle measuring device 41 Jig θ Inclination angle of shear blade E Point on the most upstream side

Claims (10)

[Claims] 1. A rotating disk-shaped receiving blade is pressed against a rotating disk-shaped shear blade so that both blades partially have an overlapping area, and a plastic film running between both blades is moved in the overlapping area. When cutting by shearing, the axis of the shear blade is slightly tilted with respect to the axis of the receiving blade,
A method for cutting a plastic film, wherein a shear blade and a receiving blade are substantially in point contact with each other on the most upstream side of the overlap region in the film traveling direction, and the film is cut at the point contact portion. 2. The shaft center of the blade is fixed in a direction orthogonal to the traveling direction of the plastic film, and the shaft center of the shear blade is adjusted to be slightly inclined with respect to the shaft of the blade. The method for cutting a plastic film according to claim 1, which is performed. 3. The angle θ of the shear blade with respect to the receiving blade
Is adjusted within a range of 0 ° <θ ≦ 1 °.
How to cut plastic film. 4. A rotating disk-shaped receiving blade is pressed against a rotating disk-shaped shear blade so that both blades partially have an overlapping area, and a plastic film running between both blades is moved in the overlapping area. A plastic film cutting device for cutting by shearing, wherein a shear blade supporting means is provided with a shear blade angle adjusting mechanism for inclining the shear blade axis with respect to the receiving blade axis. . 5. A rotating disk-shaped receiving blade is pressed against a rotating disk-shaped shear blade so that both blades partially have an overlapping area, and a plastic film running between both blades is moved in the overlapping area. In a plastic film cutting device that cuts by shearing, a shear blade angle adjusting mechanism for inclining the shaft center of the shear blade with respect to the shaft center of the receiving blade is provided in the supporting means of the shear blade, and the shear device adjusted by the cutting device is provided. An apparatus for cutting a plastic film, which is provided with an angle detection device for detecting the angle of a blade. 6. The plastic film cutting device according to claim 4, wherein an axis of the receiving blade is fixed in a direction orthogonal to a running direction of the plastic film. 7. The plastic according to claim 4, 5 or 6, wherein the shear blade angle adjusting mechanism is configured to adjust a direction of an axial center of the shear blade in a plane parallel to an axial center of the receiving blade. Film cutting device. 8. The cutting device for plastic film according to claim 5, 6 or 7, wherein said angle detecting device is supported so as to be able to approach and separate from said shear blade. 9. The shear blade angle adjusting mechanism is orthogonal to an axis A extending in the axial direction of the shear blade, an axis B extending from the axis A in a direction orthogonal to the axis A, and an axis B to the axis B. 9. An arm angle adjusting mechanism for adjusting an angle around an axis B of the arm, the arm angle adjusting mechanism extending in a direction.
A cutting device for a plastic film according to any one of 1. 10. The plastic film cutting device according to claim 9, wherein a distance from the center of the axis B of the arm angle adjusting mechanism is larger than a distance from the center of the axis B of the shear blade.