JPS60207799A - Paper shredder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Technical Field The present invention relates to a cutting mechanism, particularly an improvement in a cutting mechanism adapted to cut paper pieces from a paper roll, and to manufacturing a cutting member from a stamped piece from a thin steel plate. .

B. Background Art A large number of paper cutting devices are known that utilize a vertically reciprocating blade and a stationary anvil, and typically the blade is tapered from one edge to the other. and the blade stock is finished with a sharp cutting edge or cutting edge adjacent to the anvil.

and a blade member biased by a spring toward the anvil and configured to move across the anvil when moved in a plane perpendicular to the anvil to progressively cut the paper across its width. It is also typical to use

However, in each of these cutting devices, the blade is provided with a sharpened cutting edge that cooperates with the edge on the anvil or the edge of the anvil, which is also sharpened. The cut edges are finished to give a smooth finish.

In prior art devices, the blade members required considerable processing to obtain a blade with a sufficiently long life for use in devices such as copying machines, printing presses, and the like.

The present invention provides that the formation of the blade is a single-step stamping operation, the blade being easily attached to a cutting mechanism and reciprocating cutting motion relative to an anvil also stamped from sheet metal. A cutting mechanism is provided.

DISCLOSURE OF THE INVENTION The present invention relates to a cutting mechanism, particularly a paper shearing machine that uses a reciprocating blade and an anvil. The anvil provides a support for the paper to be cut and an edge that cooperates with a blade, the blade being a generally flat rectangular piece of sheet metal having a top edge and opposing side edges. , and a lower edge tapering from a point adjacent to the side edge toward the upper edge, and having a working surface disposed toward the anvil, the thin metal plate having a lower edge tapered toward the upper edge; from a point adjacent to said side edge to a point closest to said upper edge along the anvil, being progressively bent obliquely in the direction of turning around the anvil, so that when the blade moves vertically in its plane, The lower edge cuts the paper by contacting a point on the anvil that moves progressively across the anvil.

A cutting edge or cutting edge of the blade is formed by the bend at the lower edge of the blade, and the bend of the blade varies from a minimum angle adjacent one edge to a progressively increasing angle toward the upper edge. , preferably a maximum angle bend is defined at the center point of the blade as the lower edge tapers from both sides towards the center of the blade to reduce the vertical movement required to cut the paper. be done.

The recommended taper angle of the lower edge is 17 degrees at the center of the blade, such that the angle increases the total thickness of the blade adjacent the lower edge by 100% to 175% of the thickness of the sheet metal at the center.

The present invention will be described in more detail below with reference to the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides an improved cutting mechanism for use with materials such as paper and a cutting edge that eliminates the need for finishing the cutting edge or cutting edge. To provide an improved blade structure that reduces manufacturing costs.

A cutting blade 5 is shown in FIG. 1, the core 5 preferably having a thickness of 0.50 mm (0.020 in);
34.6anX4.57cm (13, (S 2 in
x 1.8 in) and is formed from blue-annealed sheet steel that is generally rectangular. The blade 5 has an upper edge 6 and side edges 7.8 which join the upper edge to the lower girth 1o. The lower edge 10 extends from the side edges 7 and 8 and the side! 7
and 8, it tapers gradually from each side toward the upper edge 6 to define a cutting edge or cutting edge. The lower edge 10 is recessed inwardly from the bottom of the blade 5 to define a wide inverted V-shaped cutting edge or cutting edge. The blade 5 has two holes 11 spaced apart from each other to receive the actuating mechanism.
is formed. The upper edge 6 is formed with a small bend along the line 12Vc to provide rigidity to the upper edge 6 of the blade 5.

The lower edge 10 is formed by bending the thin steel plate from a point 9 adjacent to the side edges 7, 8 to the maximum bending position where the tapered lower edge 10 is closest to the upper edge 6. It is unilaterally concentrated outwards. The fold extends approximately 265 fins (0.1 in.) from the lower edge 10 as shown in FIG.
) is formed on the blade 5 along the separated line 14, and the bending angle or amount varies from 0 to 5 degrees according to the side edge point 9 to the maximum point, i.e. on the blade 5, as shown in FIG. Gradually increase to an angle of about 17 degrees at the center point. This bend is at point 29.
The thickness of the blade 5 is 100% to 175%, that is, about 1.0%.
Between ~1.4WW (0,0401n~0.055 in
), preferably 1.14 mm (0.0451 n).

The folds of the blade 5 are designed such that the force applied between the blade and the anvil is concentrated at two cutting points as the blade 5 is moved in the plane of the blade 5 opposite the anvil. Ru. With particular reference now to FIG. 2, the blade 5 is connected to the anvil member 16
It will be seen that it is supported in contact with a fixed beam 15 located in upwardly spaced relation. The anvil part ke 16 is mounted on the support block 18 and has a thickness of about 0.0 mm.
It has an upper anvil 17V formed from annealed and polished thin steel sheet of 5 cm O, 020 in). The upper anvil 17 has an edge 28v that projects or is spaced apart from the support block 18 and extends beyond the plane of the beam 15.

The blade 5 is positioned for movement relative to the anvil 17 and the support beam 15, with the support beam 15 extending vertically along its length to receive the free ends of a pair of radially extending bins 22. It has a recess 20 located between the walls of. The bin 22 has a rotating shaft 2 driven by an actuating mechanism as shown.
It is fixed at 3. Rotation of the shaft 23 causes vertical movement of the blade 5 as a pair of radial pins 22 extending through the bore 11 of the blade 5 move the blade 5. Each gin 22
The coil spring member 25 located above presses the generally semi-cylindrical rod 26 to bring the blade 5 into the plane of the male member 15, and
15 and maintain it in contact with the flat front surface of the frame 15. As shown in FIG. 2, the shaft 23 rotates in a counterclockwise direction through an angle of approximately 15 degrees to slide the blade 5 against the beam 15 and move it downwardly so that the lower edge 10 is at the end of the anvil 17. Movement along the edge or cutting edge 28 effectively initiates shearing of any paper supported on the top surface of the anvil 17.

As the blade 5 moves downward, the cutting point moves transversely along the paper until it reaches the center point 29 of the blade 5 and ends the cut.

When the blade 5 is reciprocated vertically relative to the anvil 17, the lower edge 10 remains in contact with the edge 28 of the anvil 17 at two points, and the lateral edge 7° 8Vc of the blade 5 adjoins the depending portion. maintains contact with the anvil 17 and/or support block 18. The flexibility of the blade 5 maintains the lower edge 1B in cutting engagement. FIG. 2 does not show the deflection of the blade 5, which contacts the edge 28 of the anvil 17 and lowers the lower edge LDY.
The bend in the blade 5 is shown forcing it away from the anvil 17. This is not accurate since the blade 5 is actually arcuate in the longitudinal direction.

The blade 5 is formed by a stamping operation such that the blade 5 is cut from a sheet steel having a thickness of approximately 0.5 mm (0,020 in). The stamping on the blade is on the lower edge 10
It also forms a bent part on the upper edge 6.

The curled edge resulting from the stamping lies on the working surface located against the beam 15. The bend along the lower edge 10 is defined to give the blade 5 a desired bending angle. The normal elasticity of thin steel plate material is due to the downward movement of the blade 5 across the anvil 17? As it continues, it causes a deflection of the nuclear force 5 and the obstruction causes a movement and rocking or flexing of the blade 5 relative to the coil spring 25, thereby preventing extensive damage to the blade 5. obtain.

[Brief explanation of the drawing]

FIG. 1 is an elevational view of a cutting blade of the present invention, and FIG. 2 is a cross-sectional view of a cutting mechanism having a cutting blade and an anvil. In the figure, 5...blade; 6...upper edge near, 8...
Side edge; 10... Lower edge; 11... Hole; 15... Support beam; 16... Anvil part: 17... Anvil; 18.
・・Support block; 22...ty; 'l 3...
・Rotation axis; 25...Coil spring; 28...Edge agent Akira Asamura

Claims (1)

[Claims] Fil In a paper shearing machine comprising an anvil supporting the paper to be cut transversely and having an edge cooperating with a blade, along which edge the paper is cut. : generally a sheet metal having a working surface defined by an upper edge, opposing side edges, and a lower edge tapering from a point adjacent to at least one side edge toward the upper edge; consisting of a flat rectangular piece, the metal sheet being arranged along the lower edge towards the anvil and sloping progressively outward from the plane of the blade from the side edge towards the upper edge; , whereby vertical movement of the blade in the plane of the working surface and the edge of the anvil maintains contact with the anvil in at least one place. (2. In the paper shearing machine according to claim 1: the paper is characterized in that the lower edge is inclined in a chi 7'e shape from a portion adjacent to each side edge toward the upper edge. Shearing machine. (3) In the paper shearing machine according to claim 1 or 2, the paper shearing machine is characterized in that the thin metal plate has a thickness of 0-5 m4. (4) Claims In the paper shearing machine according to any one of Items 1 to 6, the blades extend along the lower edge from the side edge of the thin metal plate toward the narrowest part.
．． A paper shearing machine characterized in that it has a total loss thickness of between 5 and 1.4 mm.