JPH0621886U - cutter - Google Patents

Abstract

(57) [Abstract] [Purpose] There is no need to forcibly transfer the cutting object during cutting, there is no need to change the angle of the cutting edge depending on the thickness of the cutting object, the structure and operation are simple, and the material is thin. To provide a cutter with a clean cutting surface that can reliably cut even the object to be cut without the cutting edge spinning [Construction] One end of the outer peripheral edge faces outward and the tip becomes thin in the direction of the other surface A pair of disc-shaped cutting blades 2 and 3 that are inclined to form the single blades 4 and 8 are rotatably arranged in opposite directions so that a part of the other surface of the single blades 4 and 8 abuts. A plurality of curved concave portions 5 in which the single blade 4 of the cutting edge 2 is curved concavely toward the center at appropriate intervals and the cutting edge angle α is reduced toward the back.
Is formed, and the other cutting edge 3 is formed in a circular shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutter suitable for cutting synthetic resin bags, paper bags and the like.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, a cutter for cutting a bag made of synthetic resin, paper or the like has a pair of circular cutting blades having a single blade along the peripheral edge as shown in Japanese Utility Model Publication No. Sho 49-11258. The bags were rotatably arranged so that the parts overlap each other and engage with each other, and the bag fed by the bag feeding belt is cut by the single-edged blade with which the circular cutting blade is engaged. However, in this product, the engaging part of the cutting edge is liable to slip and run idle, and to prevent this, the bag must be continuously fed by the bag feeding belt even during cutting, and the cutting depends on the thickness of the bag material. It was necessary to change the angle of the blade and the operation was troublesome.

Further, one surface of a peripheral edge portion of a disk-shaped blade plate is press-fitted to have an end thin outward inclination, a large number of concave lines are radially engraved on the outward inclination portion, and the opposite surface is inclined outward. A combination of two blades for cutting culm, which has been machined on the surface and provided with a double-edged saw blade between the ridges on the periphery of the stencil, is known as Japanese Utility Model Publication No. 56-27698. Although this has been proposed, this blade has a double blade, so a gap is created between the blades facing each other, making it difficult to cut in the case of thin bag material such as polyethylene, and the bag becomes a serrated blade. It was easy to get caught and entangled.

[0004]

[Problems to be solved by the device]

 The object of the present invention is that the means for forcibly transferring the object to be cut during cutting is not necessary, there is no need to change the angle of the cutting edge according to the thickness of the object to be cut, the structure and operation are simple, and the material to be cut is thin. The object of the present invention is to provide a cutter with a clean cutting surface that can reliably cut even the object without the cutting blade spinning.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a pair of disc-shaped blades in which one surface of an outer peripheral edge is inclined outwardly toward the other surface so that the tip is thinned to form a single-edged blade. In a cutter in which the cutting blades are rotatably arranged in opposite directions so that a part of the other surface of the one cutting edge comes into contact, one cutting blade of one cutting blade is curved concavely toward the center at appropriate intervals. At the same time, a plurality of curved recesses with smaller cutting edge angles are formed toward the back, and the other cutting edge is formed into a circular shape.

[0006]

[Action]

 When the material to be cut enters the part where the pair of cutting blades engage, the scissor angle between the curved recess and the mating blade gradually decreases as the cutting blade rotates, and as the cutting blade rotates while biting the material to be cut. Send the object to be cut and cut it at the same time.

Since this is repeated for each protruding blade in the next curved concave portion, continuous feeding can be obtained.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, a cutter 1 is arranged in a staggered manner so that a part of its peripheral edge overlaps, and a pair of disc-shaped cutters are attached to two parallel rotating shafts 10 and 11 so as to be rotatable in opposite directions. The cutting blades 2 and 3 are provided, and a single blade 4 is formed on the peripheral edge of one of the cutting blades 2 so that one surface thereof is outward and the tip is thinned toward the other surface. The single blade 4 is appropriately spaced. A plurality of curved concave portions 5 are formed by being concavely curved in the central direction, and trapezoidal protruding blades 6 having a wider other surface side are formed between the curved concave portions 5 and the curved concave portions 5, respectively, and are formed in the central portion. Is provided with a rotary shaft through hole 7. As shown in FIGS. 3 and 4, the curved concave portion 5 of the cutting blade 2 has a smaller cutting edge angle α as it goes deeper.

The other cutting edge 3 has a circular shape having substantially the same diameter as that of the cutting edge 2, and a circular single-edged blade 8 is formed on the peripheral edge thereof, one surface of which is inclined outward so that the tip is thinned toward the other surface. A rotary shaft through hole 9 is formed in the center of the circle.

As shown in FIG. 2, the cutting edge 2 and the cutting edge 3 are arranged such that the other surfaces of the peripheral edge portion which are not inclined contact and the cutting surface is formed at this contact portion. , The single blades 4 and 8 rotate so as to move in the object transfer direction, and the object to be cut 12 such as a bag sent from the previous stage so as to intersect the cutting blades 2 and 3 by the transfer device. The cutting surface of the cutting blade 2 and the cutting blade 3 is cut and sent to the subsequent stage. At this time, the scissors angle of the one blade 4 in the curved concave portion 5 of the one cutting blade 2 and the one blade 8 of the other cutting blade 3 gradually decreases as the cutting blades 2 and 3 rotate, and the cutting object 12 is eaten. The object 12 to be cut is transferred as the cutting blades 2 and 3 rotate while it is being bitten, and at the same time, it is cut.

[0011]

[Effect of device]

 In the cutter of the present invention, a pair of disc-shaped cutting blades each having a single edge are rotatably arranged in opposite directions so that a part of the other surface of the single blade abuts, and one edge of one cutting edge is appropriately separated. Since the notch angle is curved in the direction of the center at every interval and the notch angle is made smaller toward the inner part, the scissor angle between the curved recess and the mating blade gradually becomes smaller as the cutting blade rotates, and The protruding blade formed between the curved recesses does not bite into the object to be cut and the cutting edge does not run idle.Therefore, such as a bag feeding belt that forcibly transfers the object to be cut at the cutter part. There is no need to install a device, the structure of the device is simple, the object to be cut can be reliably cut regardless of the thickness of the material, and it is not necessary to change the angle of the cutting blade depending on the thickness of the object to be cut. It is easy to operate and is made of dusty material such as dust paper. It is possible to beautify the finish of the cut surface. In addition, the other cutting edge was formed into a circular shape, and the non-inclined surface of the single edge contacted, so there was no gap in the cutting surface of the cutting edge, and it is possible to cut even a thin material. Since the curved concave portion is formed only on one of the cutting edges, the other cutting edge can have a structure similar to that of a conventional cutter, which facilitates processing.

[Brief description of drawings]

FIG. 1 is a plan view of a cutter showing an embodiment of the present invention.

FIG. 2 is a side view of a cutter showing an embodiment of the present invention.

FIG. 3 is an enlarged sectional view taken along line AA of FIG.

4 is an enlarged sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Cutter 2,3 Cutting edge 4,8 Single edge 5 Curved concave portion 6 Protruding edge 7,9 Rotating shaft through hole 10,11 Rotating shaft 12 Cutting object α Cutting edge angle

Claims (1)

[Scope of utility model registration request] 1. A pair of disc-shaped cutting blades having one edge formed by inclining one surface of an outer peripheral edge outwardly toward the other surface to form a single edge so that a part of the other surface of the one edge abuts. In a cutter that is rotatably arranged in opposite directions to each other, one edge of one cutting edge is curved concavely toward the center at appropriate intervals, and a plurality of bendings with the cutting edge angle becoming smaller toward the back A cutter characterized in that a concave portion is formed and the other cutting edge is formed in a circular shape.