JP3390879B2 - Slitter device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slitter apparatus for cutting a web with a pair of rotary blades. 2. Description of the Related Art A slitter apparatus using a pair of disk blades as a cutting element is disclosed in Japanese Utility Model Laid-Open No.
It is known in, for example, JP-A-1-112893. One of the pair of disk blades is formed to be thick, and the other is formed of a thin plate. Hereinafter, a disk blade formed of a thin plate is referred to as an elastic round blade, and a thick disk blade is referred to as a rigid round blade. In the above-mentioned conventional apparatus, cutting is performed by pressing the peripheral edge of the elastic round blade against the peripheral edge of the rigid round blade in a surface contact state. For this reason, the flatness of both round blades affects the sharpness, and if one of the two round blades has a decrease in flatness or wear of the cutting edge, a gap is generated at the occlusal point and the sharpness is extremely reduced. In order to avoid such disadvantages, an elastic round blade is formed of a thin plate, which is held and fixed in a state of being bent in the shape of a disc spring, and the cutting edge on the periphery is pressed against the rigid round blade in line contact to cut. A form of performing is being adopted. FIG. 5 shows a conventional support structure of this kind of elastic round blade, in which an elastic round blade 20 is fitted into a holding groove 22 between adjacent blade holders 21, and a disc spring having a diameter larger than the outer diameter of the blade holder 21. 23 is a holding groove 22
To one side wall. The blade holder 21 is externally fitted and fixed to the drive shaft 24. In the mounted state, the plate surface of the elastic round blade 20 is curved and deformed by receiving the elastic force of the disc spring 23, and further, the entire elastic round blade 20 is slightly slightly with the contact portion 25 of the holding groove 22 as a fulcrum. The inner edge of the holding groove 22 is separated from the inner side wall of the holding groove 22 by an amount T. [0004] As described above, in the blade holding mode in which the elastic round blade 20 is bent and deformed, the elastic round blade 20 is bent.
Is supported only by the contact portion 25, and the amount of deflection of the plate surface is not constant in the circumferential direction due to a slight displacement of the contact position, so that the cutting blade 26 largely shakes. For example, in the case of an elastic round blade 20 having a diameter of 150 mm and a thickness of 0.5 mm, the run-out amount of the cutting blade 26 is
0.05-0.06 mm. As described above, when the runout width of the cutting blade 26 is large,
It is necessary to press the cutting blade 26 against the rigid round blade 27 with a strong force to absorb the run-out, and the cutting blade 26
28 is easily worn. In particular, when the cutting blade 28 of the rigid round blade 27 is formed of a cemented carbide, it is easily damaged by chipping or the like. As the contact pressure of the elastic round blade 20 increases,
There is also a problem in that the cutting blades 26 and 28 of the two round blades 20 and 27 are worn out early, and a sharp cut cannot be obtained. In particular, in the case of a magnetic tape, the cut edge is deformed as the sharpness is reduced, and the magnetic recording characteristics are reduced. SUMMARY OF THE INVENTION An object of the present invention is to provide a slitter device for holding and fixing an elastic round blade to a blade holder in a curved deformation state, in which the elastic round blade is prevented from oscillating and a cutting blade such as chipping caused by excessive contact pressure. And to improve the durability of both cutting blades and maintain the sharpness over a long period of time. [0007] The slitter apparatus of the present invention has a rigid round blade 3 and an elastic round blade 4 which are respectively driven to rotate. An elastic round blade 4 and a disc spring 8 circumscribing one side of the elastic round blade 4 and having its plate surface curved and deformed toward the rigid round blade 3 side are adjacent to the holding groove 7 of the blade holder 6. Incorporated. The inner peripheral wall of the holding groove 7 is provided with an inner contact portion 11 which comes into contact with the inner curved surface 4 a of the elastic round blade 4 and defines the position of the inner edge side of the elastic round blade 4. Specifically, an inner contact portion 11 is projected from the bottom of the inner wall of the holding groove 7, and the inner contact portion 11 is elastically rounded with reference to the outer contact portion 10 provided at the opening edge of the holding groove 7. The blade 4 protrudes from the disc spring 8 side slightly larger than the loose amount near the inner edge. The elastic round blade 4 incorporated in the holding groove 7 is bent by being pressed by the disc spring 8, and the inner curved surface 4a has the outer contact portion 1
It is taken to 0. Further, on the radial inner side of the outer contact portion 10, the inner contact portion 11 contacts the inner curved surface 4a, and slightly pushes the inner edge side of the elastic round blade 4 back to the disc spring 8 side. In this manner, when the position of the inner edge side of the elastic round blade 4 is strictly defined by the inner contact portion 11, the displacement of the contact position between the outer contact portion 10 and the inner curved surface 4a can be suppressed. Variation in deformation amount can be suppressed. According to the present invention, the elastic round blade 4 curved and deformed by the disc spring 8 is supported by the external contact portion 10 and the internal contact portion 11 provided in the holding groove 7, and the elastic round blade 4 is provided. Of the elastic round blade 4 is prevented from dispersing. As a result, the run-out amount of the cutting blade 12 is reduced to 1/3 to 1/4 of that of the conventional device, and the rigid round blade 3
Therefore, the pressing force of the elastic round blade 4 against the elastic round blade 4 can be reduced, so that the degree of wear of the elastic round blade 4 and the rigid round blade 3 can be reduced, the durability can be improved, and sharp sharpness can be maintained for a long period of time. FIGS. 1 to 3 show an embodiment in which the present invention is applied to a slitter device for a magnetic tape. 2 and 3
, The slitter apparatus has a pair of drive shafts 1 and 2 arranged in parallel, and a group of rigid round blades 3 and a group of elastic round blades 4 are arranged and fixed on each drive shaft 1.2 at regular intervals. I do.
A guide 5 for transitionally guiding a wide web W is provided at an engagement portion between the two round blades 3 and 4. The rigid round blade 3 is formed thick and is directly mounted on the drive shaft 1. The elastic round blade 4 is formed of a tool steel thin plate having a thickness of 0.5 mm, and is mounted on the drive shaft 2 via a blade holder 6. Specifically, a holding groove 7 is formed between the adjacent blade holders 6, the elastic round blade 4 is mounted in the holding groove 7, and is pressed and fixed by a disc spring 8. As shown in FIG. 1, the disc spring 8 is formed to have a diameter larger than the outer diameter of the blade holder 6 and circumscribes the elastic round blade 4 outside the holding groove 7 so that its plate surface is rigidly round. It is curved and deformed toward the blade 3 side. The elastic round blade 4 pressed by the disc spring 8 is attached to the outer contact portion 1 provided at the opening edge of the inner wall of the holding groove 7.
0, and its inner edge is inclined away from the inner wall of the holding groove 7. In this state, the elastic round blade 4 is supported only by the external contact portion 10 and is in an extremely unstable state, and is generated inside the plate surface due to a slight variation in the contact position with the external contact portion 10. Deformation stress tends to vary in the circumferential direction. In order to suppress the above-mentioned variation, an inner contact portion 11 is protruded from the bottom of the inner wall of the holding groove 7 and pressed against the vicinity of the inner edge of the inner curved surface 4 a of the elastic round blade 4. The inner contact portion 11 is made to protrude from the outer contact portion 10 toward the disc spring 8. The amount of protrusion S is the amount of separation T () when the inner edge of the elastic round blade 4 separates from the inner wall of the holding groove 7. With reference to (see FIG. 5), the release amount T is set slightly larger, and the inner edge of the elastic round blade 4 is pushed back toward the disc spring 8 by the inner contact portion 11. The release amount T varies depending on the shape, size, material, and the like of the elastic round blade 4 and the disc spring 8.
The size also changes depending on the difference in the contact position of the disc spring 1 and the disc spring 8 with the elastic round blade 4. As described above, the inner contact portion 11 forms the inner curved surface 4a.
Is slightly pushed back to the disc spring 8 side, the elastic round blade 4 is supported at two locations of the outer contact portion 10 and the inner contact portion 11 in the holding groove 7, and the mounting posture can be stabilized. Since the contact position of the elastic round blade 4 with the external contact portion 10 is made constant in the circumferential direction, the amount of deformation of the peripheral edge can be made uniform in the circumferential direction.
2 can be reduced to a small extent in the axial direction. The inventor measured how the runout amount of the cutting blade 12 changes by changing the protrusion amount S of the inner contact portion 11 and further combining the disc springs 8 having different pressing contact forces. . Further, for comparison, the run-out amount of the elastic round blade in the conventional slitter apparatus was measured in the same manner. FIG. 4 shows the result. The elastic round blade 4 has a thickness in any case.
The same material having a diameter of 0.5 mm and an outer diameter of 144 mm was used.
The outer diameter of the blade holder 6 is 122 mm in the present invention, and 115 mm in the conventional apparatus. As is clear from the chart of FIG. 4, in the conventional apparatus, the run-out amount at the cutting edge is as large as 43 to 34 μm irrespective of the magnitude of the pressing force of the disc spring.
2 was able to be suppressed to 6 to 10 μm. In addition,
The three types of blade holders A, B, and C have a protrusion amount S of the inner contact portion 11.
Are different, and the protrusion amounts S are 0.05, 0.10,
It was 0.15 mm. At this time, the free amount of the inner edge of the inner curved surface 4a was 0.062 to 0.07 mm. [0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a mounting structure of an elastic round blade. FIG. 2 is a longitudinal sectional front view of a main part. FIG. 3 is a sectional view taken along line AA in FIG. 2; FIG. 4 is a table showing measurement results of the run-out amount of the cutting edge of the elastic round blade. FIG. 5 is a longitudinal sectional view showing a conventional elastic round blade mounting structure. [Description of Signs] 3 Rigid round blade 4 Elastic round blade 4a Inner curved surface 6 Blade holder 7 Holding groove 10 External contact portion 11 Internal contact portion

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B26D 1/24

Claims (1)

(57) [Claim 1] A holding groove 7 formed between adjacent outer blade holders 6 having a rigid round blade 3 and an elastic round blade 4 which are respectively driven to rotate. To
An elastic round blade 4 and a disc spring 8 for pressing and fixing the elastic round blade 4 are mounted, and the disc spring 8 is formed to have a diameter larger than the outer diameter of the outer blade holder 6.
And circumscribes one side of the elastic round blade 4 outside the holding groove 7.
The plate surface of the elastic round blade 4 is bent and deformed toward the rigid round blade 3 side.
The elastic round blade 4 pressed by the disc spring 8 is attached to the inner wall of the holding groove 7.
Is received by the circumscribed contact portion 10 provided at the opening edge of the
In the slitter device in which the inner edge is inclined away from the inner wall of the holding groove 7, the inner curved surface 4 of the elastic round blade 4 is provided on the bottom of the inner wall of the holding groove 7.
a, the inner contact portion 11 that presses against the vicinity of the inner edge of the outer contact portion 10.
It is protruded so as to project into the disc spring 8 side than the projecting amount S of the inscribed hook part 11, the inner edge retention groove of the elastic round blade 4
7 based on the amount of separation T when leaving the inner wall of
Slitter which is slightly larger than the free volume T.