JPH0857796A - Round blade tool device - Google Patents

Abstract

PURPOSE: To improve the constitution of a plate spring used for fixing in order to improve the built-in accuracy of an upper blade. CONSTITUTION: A round blade tool device 10 is formed of a first rotary shaft 11 and a second rotary shaft 12. An upper blade 15 is fixed to the first rotary shaft 11 by a plate spring 1, within the cutout step part 14 of a holder 13, and a lower blade 18 is fixed to the second rotary shaft 12. The plate spring 1 is formed of a center fitting hole 2 and an annular side face part 3, and a recessed curved grooves 4 are formed at the outer peripheral edge of the annular side face part 3, circumferentially at equal spaces apart. The total length of the cutout width of the recessed curved grooves 4 takes up 50-70% of the whole length of a basic circle, and the cutout depth (h) is set in the relation of h<=H/2 on the basis of the radial width H of the plate spring 1. The axial width W of the plate spring 1 is determined by the annular flat faces 5, 6 at the outer peripheral edge and bent edge formed taking account of stability at the time of fitting the upper blade 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a round blade tool device in which an upper blade and a lower blade are assembled so as to face the first and second rotating shafts, and more particularly, they are used for fixing the upper blade. By improving the structure of the disc spring, the accuracy of assembling the upper blade can be improved.

[0002]

2. Description of the Related Art Conventionally, as a round blade tool device used for cutting a tape slitter or the like, for example, an actual flat blade 3-11
The one disclosed in Japanese Patent No. 589 is known. And in this device, as a disc spring for fixing the upper blade,
A circular hole is formed by forming circular holes at equal intervals along the circumferential direction.

[0003]

However, in the disc spring seen in the above-mentioned publication, when the upper blade is attached, tensile stress acts in the outer peripheral direction and compressive stress acts in the inner diameter direction.
It is deformed by these stresses and causes distortion on the left and right of the pressure point. Then, since this distortion moves and changes with the rotation of the upper blade and the lower blade, there is a problem that vibration is caused and the cut surface of the cutting material deteriorates.

In view of the above, according to the present invention, the structure of the disc spring is improved to improve the assembling accuracy of the upper blade.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned points, and a concave curved groove located in the circumferential direction is formed in an inclined annular side surface portion of a disc spring for fixing an upper blade. The recesses are formed at intervals, the total length of the notch widths of the concave curved grooves occupies 50 to 70% of the entire length of the basic circle, and the notch depth h is h ≦ H / 2 with respect to the radial width H. It is set according to the relationship.

Further, the annular side surface portion formed on the disc spring is formed with a narrow annular flat surface at the outer peripheral edge thereof, and the bent edge thereof is also formed with a narrow annular flat surface. With these flat surfaces, the dimension of the width W in the axial direction is made uniform.

[0007]

In the round blade tool device according to the present invention, the disc spring for fixing the upper blade is formed with the concave curved groove on the outer peripheral edge of the annular side surface portion thereof. Therefore, the outer peripheral tensile stress generated in the disc spring is absorbed by the concave curved groove, and the strain can be extremely reduced. As a result, a stable pressure is exerted on the adjacent contact points, the pressure change during rotation is small, and the tip edge deflection of the upper blade can be suppressed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the round blade tool device of the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 denotes a disc spring having a center mounting hole 2 and an annular side surface portion 3, respectively. The outer peripheral edge of the annular side surface portion 3 has concave portions at equal intervals in the circumferential direction. A curved groove 4 is formed. And this disc spring 1
Is applied to a round blade tool device 10 having a first rotating shaft 11 and a second rotating shaft 12, as shown in FIG. Specifically, it is used to fix the upper blade 15 made of a thin disk by the notched step portion 14 of the holder 13 incorporated in the first rotating shaft 11. In this case, a lower blade 18 having a notch step portion 17 for forming the cutting blade 16 is attached to the second rotary shaft 12, and an upper blade 15 and a magnetic tape, etc., which are a multi-set of these, are provided. It is cut by the lower blade 18.

The disc spring 1 has the concave curved groove 4 as described above.
The concave curved groove 4 has a semicircular shape,
A semi-elliptical shape is preferable. In the circumferential direction, the total length of the cutout widths of the concave curved grooves 4 occupies 50 to 70% of the total length of the basic circle. This is because if the total length of the notch widths of the concave curved grooves 4 is less than 50%, the peripheral tensile stress generated when the upper blade 15 is attached is insufficiently absorbed, and if it exceeds 70%, the strength is increased. It becomes a problem because the fixing force becomes insufficient due to the weakening of.

Furthermore, the notch depth h of the concave curved groove 4 is
If the radial width H of the disc spring 1 is used as a reference, the relationship h ≦ H / 2 is set. This is because the strength of the disc spring 1 becomes insufficient if it exceeds H / 2. In this case, it is preferable that the axial width W of the disc spring 1 is determined by the narrow annular flat surfaces 5 and 6 formed at the outer peripheral edge and the bent edge. This is because the notch step portion 14 of the holder 13 is formed by accurately aligning the dimension of the axial width W.
It has improved stability when installed inside.

FIG. 5 shows a round blade tool device 10 constructed in this way, in the case of the present invention in which the upper blade 15 is fixed by the disc spring 1 having the concave curved groove 4 and the concave curved groove 4 in the present invention. Conventional cases B to which a disc spring is not applied are compared with each other. In this case, the shape of the disc spring has an outer diameter of 124
mm, the inner diameter is 101 mm, the radial width H of the annular side surface portion 3 is 11.5 mm, and the radius of the concave curved groove 4 is 5 mm.
As a semi-circular groove of, 24 so that the notch depth is 5 mm
It is formed individually. As a result, in the case of the present invention, A
Compared with the conventional case B, the edge runout is improved to 1/2 to 1/3. Also, the round hole seen in Japanese Utility Model Laid-Open No. 3-11589 mentioned above was not so different from the conventional case B.

[0013]

As described above, the present invention provides the upper blade 1
The annular side surface portion 3 of the disc spring 1 for fixing 5 is formed with a concave curved groove 4 specified at the outer peripheral edge. Therefore, when the disc blade 1 is used to assemble the upper blade 15 into the notched step portion 14 of the holder 13, the outer peripheral tensile stress generated in the disc spring 1 is absorbed by the concave curved groove 4, and the strain is extremely strained. Decrease to. As a result of the improved assembling accuracy, there is an advantage that the run-out of the cutting edge is improved and the cut end of the magnetic tape or the like is improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a disc spring applied to a round blade tool device of the present invention,

FIG. 2 is a vertical sectional view,

FIG. 3 is a partially enlarged sectional view,

FIG. 4 is a sectional view showing the concept of a round blade tool device of the present invention,

FIG. 5 is an explanatory view showing a state of edge deflection in case A of the present invention and in case B of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc spring 2 Center mounting hole 3 Annular side surface part 4 Recessed curved groove 4 5 Annular flat surface 6 Annular flat surface 10 Round blade tool device 11 First rotating shaft 12 Second rotating shaft 13 Holder 14 Notch step 15 Upper Blade 16 Cutting blade 17 Notch step 18 Lower blade

Claims (2)

[Claims] 1. A first rotating shaft 11 and a second rotating shaft 12
Are arranged in parallel relationship, and the upper blade 15 made of a thin disk is fixed to the first rotation shaft 11 by the disc spring 1 in the notch step portion 14 of the holder 13, and the second rotation shaft The shaft 12 is provided with a plurality of sets of upper blades 15 and lower blades 17 by fixing substantially disk-shaped lower blades 17 each having a notch step portion 17 for forming a cutting edge 16. In the round blade tool device described above, the disc spring 1 is formed with concave curved grooves 4 at equal intervals in the annular side surface portion 3, and the concave curved grooves 4 have a total length of the cutout widths. Occupy 50 to 70% of the total length of the basic circle,
A round blade tool device, wherein the notch depth h is set in a relation of h ≦ H / 2 with respect to a radial width H. 2. An annular flat surface 5 is formed on an outer peripheral edge of the annular side surface portion 3 according to claim 1, and a narrow annular flat surface 6 is also formed on a bent edge.
The circular blade tool device according to claim 1, wherein the dimensions of the axial width W are made uniform by the annular flat surfaces 5 and 6.