JP3059548U - Sheet cutting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts compared to conventional ones to make them even smaller and lighter, and to reduce costs by reducing the assembly work. [Structure] Straight edges of both fixed blade and movable blade are straightened,
Further, in a rotary sheet cutting device in which both cutting edges are arranged so as to cross each other so as to have a shear angle, a plate material is bent so as to form a cross section and have side plates at both ends, and one side of the cross section is used as a blade. A rotary sheet cutting device, wherein a fixed blade member and a movable blade member are mutually joined by pins so as to be rotatable at respective side plates, and are integrated. It is preferable that a fulcrum for pin-joining the blade member has a fulcrum shaft formed as a burring protrusion by press working. [Effect] Consists of a fixed blade member and a movable blade member,
In addition, since these members can be manufactured by sheet metal, manufacturing and assembling are extremely easy and cost merit is great.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention cuts a long sheet such as roll paper, and is particularly suitable for cutting a loaded roll paper into a required length, which is incorporated in office equipment such as a facsimile machine.

[0002]

[Prior art]

 A rotary sheet cutting device in which the cutting edges of both a movable blade and a fixed blade are straight and the cutting edges of both are crossed so as to have a shear angle is disclosed in Japanese Patent Publication No. 29-6849, etc. Is characterized by the fact that the processing is straight and simple. In recent years, this type of sheet cutting device has been incorporated in office equipment such as facsimile machines, and there has been a demand for smaller, lighter, and less expensive devices. The sheet cutting device disclosed in Japanese Utility Model Publication No. 3-51116 allows all of the main members to be manufactured by sheet metal processing, and achieves considerable reduction in size and weight and cost.

[0003]

[Problems to be solved by the invention]

 Although the sheet cutting device disclosed in Japanese Utility Model Publication No. 3-51116 is considerably smaller and lighter, it is manufactured by processing and assembling the chassis, fixed blade holder, movable blade holder, fixed blade and movable blade separately. there were. The present invention enables further cost reduction by further reducing the number of components and making it even smaller and lighter, and reducing the assembly work.

Further, in the conventional sheet cutting apparatus, there is a fulcrum shaft in which the movable blade can swing, which is embossed by extrusion press working. However, the height of the shaft which can be worked by extrusion is a plate thickness. Because it is about 80% or less, the shaft may come off the bearing due to vibration or impact.

[0005]

Means for Solving the Problems The present invention is directed to a rotary sheet cutting apparatus in which both cutting edges of a fixed blade and a movable blade are straight, and both cutting edge lines are arranged so as to have a shear angle. A fixed blade member and a movable blade member, each of which is formed by bending a plate material so as to have an F-shaped cross section and having side plates at both ends and using one side of the W as a blade, are rotatably pin-joined to each side plate at each side plate. This is a rotary sheet cutting device characterized by being integrated. It is preferable that a fulcrum for pin-joining the blade member has a fulcrum shaft formed as a burring protrusion by press working.

[0006]

[Action]

 The rotary sheet cutting device of the present invention is composed of two members, a fixed blade member and a movable blade member, and since these members can be manufactured by sheet metal, manufacturing and assembling are extremely easy and cost merit is great.

[0007] The fixed blade member and the movable blade member have a cross section of a letter-like shape, one side of which is used as a blade, and the other side functions as reinforcement and has appropriate elasticity. Side plates are provided at both ends of the fixed blade member and the movable blade member by bending, and the side plates are joined to each other with pins. Since the side plate portion is bent, the side plate portion and the blade portion are not rigid but have a suitable elasticity (spring property). This eliminates the need for a member such as a spring for preventing blade biting as in the sheet cutting device of Japanese Patent Publication No. 29-6849, so that the sheet cutting device can be realized with two-point members. Also, due to this elasticity, the allowable range of the positional relationship between the two blade edges is large, so that the conventional adjustment step is not required, and sufficient cutting performance can be obtained only by combining the fixed blade member and the movable blade member.

[0008] In addition, the fulcrum shaft on which the movable blade can swing can be formed as a burring protrusion by press working, so that the height of the shaft can be protruded to nearly 200% of the plate thickness. The problem of dropout is solved.

[0009]

【Example】

 1 is a front view, FIG. 2 is a bottom view, FIG. 3 is a left end view, and FIG. 4 is a right end view of the sheet cutting apparatus 1 according to the embodiment of the present invention.

The sheet cutting device 1 includes a fixed blade member 2 and a movable blade member 3. The fixed blade member 2 has a cross section of an oval shape, and one side is a blade portion 2a used as a blade, and the other side is a reinforcing portion 2b. Side plates 4 and 5 are provided at both ends of the blade 2a by bending. Since the side plates 4 and 5 have a substantially L-shape with their tips protruding upward, they are particularly easily deformed elastically. A guide piece 8 is integrally formed on the cutting start side of the blade portion 2a, that is, on the left side in FIG. 1, to prevent biting of the blade at the start of cutting. As shown in FIG. 2, the reinforcing portion 2b has a plurality of holes 9 for attachment.

The movable blade member 3 also has a cross section in the shape of an oval, and one side is a blade portion 3a used as a blade, and the other side is a reinforcing portion 3b. A side plate portion 6 is provided on the cutting start end of the blade portion 3a, that is, on the left side in FIG. 1, and a side plate portion 7 is provided on the cutting end side of the reinforcing portion 3b, that is, on the right side in FIG.

The fixed blade member 2 and the movable blade member 3 are manufactured by bending a plate material cut into a predetermined shape.

The fixed blade member 2 and the movable blade member 3 are integrated by pin-joining the side plates 4 and 6 at a fulcrum 10 and the side plates 5 and 7 at a fulcrum 11. A link piece 12 connected to a drive system is pin-joined to the side plate 7 at a fulcrum 13. As shown in FIG. 6, these fulcrums are formed by projecting a fulcrum shaft 15 by burring by press working. The support shaft 15 is rotatably supported on a fulcrum hole 16 of the side plate portion 6.

When the drive system operates, the drive pin 14 of the link piece 12 draws a trajectory circle 17 shown by a chain line in FIG. Then, the movable blade member 3 rotates with respect to the fixed blade member within a certain angle range around the fulcrums 10 and 11. That is, from the state of FIGS. 1 to 4, the cutting edges of the blade portions 2a and 3a sequentially contact from the cutting start side, that is, the left side in FIG. 1, to the cutting end side, that is, the right side in FIG. The positional relationship between the fixed blade and the movable blade is shown in FIG. The blade portion 2a of the fixed blade member is disposed so as to intersect the rotation axis of the movable blade member, and the cutting start side end A and the cutting end side end B of the fixed blade are substantially in the locus R of the movable blade edge. Touching, and the center part interferes inside. Since the side plates 4 to 7 are elastically deformed, cutting can be performed smoothly even when the cutting edge interferes. In addition, the cutting start side end and the cutting end side end of the fixed blade are defined by the locus circle R. There is no problem even if there is some interference inside, and assembly can be performed easily.

[0015]

[Effect of the invention]

 The rotary sheet cutting device of the present invention comprises two members, a fixed blade member and a movable blade member, and since these members can be manufactured by sheet metal, the size and weight are further reduced as compared with conventional products, and the manufacture and assembly are extremely easy. Great cost merit.

[Brief description of the drawings]

FIG. 1 is a front view of a sheet cutting device 1. FIG.

FIG. 2 is a bottom view of the sheet cutting device 1. FIG.

FIG. 3 is a left end view of the sheet cutting device 1.

FIG. 4 is a right end view of the sheet cutting device 1.

FIG. 5 is an explanatory diagram showing a positional relationship between a fixed blade and a movable blade.

FIG. 6 is an end view of the fulcrum 10;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet cutting device 2 fixed blade member 3 movable blade member 4 side plate portion 5 side plate portion 6 side plate portion 7 side plate portion 8 guide piece 9 hole 10 fulcrum 11 fulcrum 12 link piece 13 fulcrum 14 drive pin 15 fulcrum shaft 16 fulcrum hole 17 trajectory circle

Claims (3)

[Utility model registration claims] 1. A rotary sheet cutting device in which both the fixed blades and the movable blades have straight edges and are arranged so that both edge lines cross each other so as to have a shear angle. A fixed blade member and a movable blade member, each of which is formed by bending a plate material so as to have a side plate portion and using one side of an oval shape as a blade, are integrally joined to each other by a pin that is rotatable with each side plate portion. Sheet cutting equipment 2. A sheet cutting apparatus for cutting a sheet by cross-pressing a cutting edge of a fixed blade having a straight cutting edge and a movable cutting edge of a movable blade, wherein a movable blade swings at both ends of the fixed blade and the movable blade. A sheet cutting device, comprising: a structure having a movable fulcrum shaft and a side plate portion having a fulcrum hole for supporting the fulcrum shaft, wherein the side plate portion has a spring-like shape. 3. The sheet cutting apparatus according to claim 2, wherein a fulcrum shaft on which the movable blade is swingable is formed by burring protrusion by press working.