JPH0112959Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention can be used, for example, by cutting rounded corners of a sheet body, by cutting semicircular finger hooks at the side edges, or by cutting a concave shape. This relates to a rotary cutting machine used for cutting convex shapes.

[Conventional technology]

Conventionally, this type of cutting machine has, for example, a lower blade with a convex cutting edge at each corner of a rectangular plate, and a concave cutting edge at the top and bottom of each face of the block body. The sheet body is provided with an upper blade provided with a section, and the upper blade is lowered relative to the lower blade to cut corners of the sheet body.

In the above-mentioned cutting machine, when replacing the cutting blade, the lower blade is removed from the base and replaced so that the cutting blade with the desired dimensions is located at the cutting position, or a separate cutting blade with the desired dimensions is replaced. At the same time, remove the upper blade from the base, select a cutting edge that matches the cutting edge of the lower blade located at the cutting position, and make the cutting edge correspond to the cutting edge of the lower blade. I was changing it like this. For this reason, there was a problem in that it took a lot of time and effort to replace the cutting blade. Also,
Since the lower blade has cutting edges formed at the corners of a rectangular plate, only four cutting edges can be obtained on one lower blade, and it is necessary to prepare multiple lower blades. It was hot.

[Problem that the invention attempts to solve]

The present invention was developed in view of the above circumstances, and its purpose is to provide a rotary cutting machine that allows easy replacement of cutting blades and eliminates the need to prepare multiple blades. That's true.

[Means for solving the problem] In order to achieve the above object, the present invention has a main shaft erected in the center of a base, and a plurality of cutting blades with different sizes on the inner peripheral surface of the base. A lower blade is provided so as to be rotatable with respect to the main shaft, and an upper blade having a plurality of cutting blade portions that match the cutting blade portions on the outer peripheral surface thereof is rotatable with respect to the main shaft and movable in the axial direction. , and the upper blade is engaged with the lower blade so as not to rotate, and the upper blade is moved in the axial direction relative to the lower blade to perform cutting.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a plan view of the rotary cutting machine of the present invention, and FIG. 2 shows a cross section. In the figure, reference numeral 1 is a base, 2 is a lower blade, and 3 is an upper blade.

A main shaft 4 is erected in the center of the base 1,
A lower blade 2 is provided on the base 1 so as to be rotatable about the main shaft 4. In addition, at the cutting position on the surface of the base 1, there is a support base 5 that supports the sheet body that is the workpiece, and guide plates 6a and 6b that guide the positioning.
is provided. This support stand 5 is located at the same height as the lower blade 2. Also, one guide plate 6a
The fixing position can be adjusted using a bolt 7. Further, mounting holes 8, 8 for bolts for fixing the base 1 are provided on both sides of the base 1.

A ball thrust bearing 24 is interposed between the base 1 and the lower blade 2 to ensure smooth rotation of the lower blade 2.

As shown in FIG. 3a, the lower blade 2 is formed into a ring shape, and is provided with a bridge portion 9 extending in the radial direction at the center. Furthermore, a plurality of convex cutting edges 10 having different radii of curvature are formed on the inner circumferential surface of the lower blade 2. Further, within the outer peripheral portion of the lower blade 2, a ball 12 is provided which is biased by a spring 11 and protrudes from the lower surface, as shown in FIG.
The balls 12 are recesses each having a semicircular cross-section and are formed at appropriate intervals on a circumference drawn around the rotation center of the lower blade 2 at a surface position of the base 1 on which the lower surface of the outer periphery of the lower blade 2 slides. 13 (see FIG. 2) to position each convex cutting edge 10 at the cutting position.

The upper blade 3 is formed into a ring shape, and an operating part 14 having a knurled outer peripheral surface is fixed to the upper part thereof with a bolt 15. Also, upper blade 3
A plurality of concave cutting edges 16 that match the convex cutting edges 10 of the lower blade 2 are formed on the lower outer peripheral surface of the blade.
The upper blade 3 and the operating part 14 are rotatably attached to the upper part of the main shaft 4 protruding from the lower blade 2 and movable in the axial direction.

An engagement groove 17 is formed in the lower part of the upper blade 3 in the radial direction, and a convex engagement part 18 protruding from the upper surface of the bridge part 9 engages with the engagement groove 17, so that the upper blade 3 is arranged so that it does not rotate relative to the lower blade 2. Since the engagement groove 17 and the convex engagement portion 18 are engaged so as to be movable in the axial direction, the upper blade 3 can be moved in the axial direction along the main shaft 4 relative to the lower blade 2.

A spring 19 is interposed between the upper blade 3 and the lower blade 2, and the spring 19 separates the concave cutting edge 16 from the convex cutting edge 10. During cutting, the concave cutting edge 16 is lowered against the elastic force of the spring 19, and cutting is performed with the convex cutting edge 10.

A stop ring 20 is provided at the upper end of the main shaft 4 to prevent the operating section 14 and the upper blade 3 from coming off the main shaft 4 due to the elastic force of the spring 19. A roller thrust bearing 21 is provided between the stop ring 20 and the operating section 14 to prevent the rotation of the lower blade 2, upper blade 3, and operating section 14 from becoming heavy due to the spring 19.

Note that 22 in FIG. 1 is a rotation stopper bolt for fixing the lower blade 2 to the base 1 so that it does not rotate. Further, 23 in FIG. 2 is a stop ring.

Next, the operation of the above embodiment will be explained.

During cutting, a sheet body as a workpiece is placed on the support stand 5, and the corner portion of the sheet body is positioned on the convex cutting edge portion 10 of the lower blade 2. Then, the upper blade 3 is lowered against the elastic force of the spring 19, and the corner of the sheet body is cut with the convex cutting edge 10 and the concave cutting edge 16.

Cutting edge part 1 with a different radius of curvature at the corner of the sheet body
When cutting at 0,16, loosen the rotation stopper bolt 22 and rotate the upper blade 3 and lower blade 2 using the operating section 14 to cut the convex cutting edge 10 and the concave cutting edge 16 having the desired radius of curvature. to the cutting position and tighten the rotation stopper bolt 22 again.

In the above embodiment, the convex cutting edge part 10 is formed on the lower blade 2 and the concave cutting edge part 16 is formed on the upper blade 3, but the concave cutting edge part 16 is formed on the lower blade 2, A convex cutting edge portion 10 may be formed on the upper blade 3. Also,
The shape of the cutting edge is not limited to a semicircular shape, but can take various shapes depending on the cutting shape. Further, although the case where the spring 19 is used is shown, an elastic piece such as rubber may also be used.

[Effect of idea]

As explained above, according to the present invention, a main shaft is set up in the center of a base, and a lower blade having a plurality of cutting edges with different dimensions on the inner peripheral surface is rotated about the main shaft on the base. an upper blade having a plurality of cutting blades on its outer peripheral surface that match the cutting blades is rotatably attached to the main shaft and movable in the axial direction, and the upper blade is attached to the lower blade The upper blade engages with the blade in a non-rotating manner and moves the upper blade in the axial direction relative to the lower blade for cutting, so when replacing the cutting blade, the upper and lower blades must be rotated. There is no need to prepare multiple blades. Therefore, work efficiency is significantly improved compared to when using a conventional cutting machine.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, FIG. 3 a is a plan view of the lower blade, and FIG. Figure 3a
It is a sectional view taken along the line arrow . 1...Base, 2...Lower blade, 3...Upper blade, 4...
Main shaft, 10, 16...cutting blade part.

Claims (1)

[Scope of Claim for Utility Model Registration] A main shaft erected on a base, and a ring-shaped member whose central part is rotatably supported by the main shaft with respect to the base; A lower part is formed in which a plurality of cutting edges of different sizes are arranged on the upper side of the parallel inner side of the ring, and an engaging part with a sliding surface parallel to the rotation axis is formed on the inside of the inner side of the ring. A member having a blade and a side surface whose center portion is rotatably supported by the main shaft with respect to the base and inserted into the inner surface of the ring of the lower blade in parallel with the rotation axis,
A plurality of cutting edges are arranged and formed on the lower side of the side surface parallel to the rotation axis, and are aligned simultaneously with the plurality of cutting edges of the lower blade. an upper blade having an engagement groove formed from the lower surface into which the engagement portion of the lower blade is slidably fitted in the direction of the rotation axis; and the upper blade is rotated in the rotation direction relative to the lower blade. Without,
A rotary cutting machine characterized in that the rotary cutting machine is movable in the direction of the rotation axis to perform shearing by aligning the cutting blades, and the upper and lower blades are rotatable with respect to the base.