JP3241751B2 - Sheet cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a movable blade used in a sheet cutting apparatus which is installed in office equipment such as a facsimile or a printer and is mainly used for cutting paper.

[0002]

2. Description of the Related Art In a conventional sheet cutting apparatus, in order to support a movable blade support plate, a movable shaft or a fixed blade is formed by bonding or caulking a stepped support shaft made of ordinary steel or stainless steel. After being fixed to the end face of the support plate, a method of fitting the support through a shaft hole provided in the support plate and supporting it is often used. It is also well known that a shaft longer than the entire length of the device is made to pass through a shaft hole provided in a movable blade or a fixed blade, and the movement of the shaft in the longitudinal direction is fixed by a retaining ring or the like. Japanese Patent Application Laid-Open No. 61-135772 discloses a rotating member mounting mechanism which includes a through hole in a bearing portion, a claw at a tip, and a projection provided with elastic deformation. The rotating member is fitted into the projection of the component by fitting, and the rotating member is held by elasticity and claws.

[0003]

The support shaft fixed to the end face of the movable blade is mainly made of ordinary steel or stainless steel, mainly by machining such as turning. However, ordinary steel is susceptible to rust. If you want to suppress rust, use stainless steel. However, stainless steel is disadvantageous in price because it is expensive in material and has poor workability. Furthermore, if the support shaft is inserted into the shaft hole of the movable blade manufactured separately from the support shaft, or if it is joined by a method such as bonding or caulking, misalignment will occur, causing a problem in accuracy as a cutting device. There is also. In the method using a support shaft that is longer than the entire length of the cutting device, at least three holes, that is, a hole provided in the movable blade and a hole provided in the support plate, must be penetrated. It is disadvantageous and has a problem that the number of parts is large. As a result, the cost is increased and the price is increased. JP-A-61-135 described above.
No. 772 discloses a "rotating member mounting mechanism".
The parts with protrusions and claws that fit into the through holes in the bearings are complicated in shape, so they are expensive to manufacture, and they can be used in applications such as sheet cutting devices that receive loads even if they are extremely light. There is strong anxiety about using it. The present invention solves the above problems, the assembly work is simple, the number of parts is small,
It is therefore an object of the present invention to provide a lightweight, inexpensive and highly accurate movable blade for a cutting device.

[0004]

The inventor of the present invention has made various studies to solve the above-mentioned problems, and as a result, it has been found that even if the support shaft is not fitted into the entire length of the shaft hole provided in the support plate or the side plate. If the support shaft is inserted to a depth of about half of the length of the shaft hole, it is found that if it is a light load application such as a sheet cutting device, it can function as a shaft and a bearing, The present invention has been completed. Then, in order to form the support shaft as described above, it has been found that a protruding extrusion shaft is formed by extrusion (also referred to as embossing) by a press machine, and this extrusion shaft may be fitted into a shaft hole. . More specifically, the movable blade is a sheet metal formed movable blade that cuts a sheet material in cooperation with a fixed blade, and a side plate that is press-formed on a side surface of the blade, and an extrusion shaft that is embossed on the side plate. Wherein the extrusion shaft is a movable blade for a sheet cutting device serving as a support shaft for rotation of the movable blade.

[0005]

According to the present invention, when a side plate of a movable blade is formed of a sheet metal, a sheet having a structure capable of being fitted with a shaft hole or the like formed in a support plate by providing an extrusion shaft by extrusion in a sheet metal serving as a side plate. It is a movable blade for a cutting device. By adopting a structure that can be supported by the extrusion shaft and the shaft hole as described above, the number of parts of the sheet cutting device is reduced, and the assembling is simplified at the time of assembling. Compared with the conventional method of joining by caulking or the like, the positional relationship of the entire apparatus can be secured with higher accuracy, and the cost can be significantly reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments and drawings. FIG. 1 shows an embodiment of a movable blade of the present invention formed by sheet metal, and a sheet cutting apparatus using the movable blade. In FIG. 1, the movable blade 2 is formed by press-molding both side plates 21 integrally with a sheet metal having a thickness of 2 mm. At the same time, the extruding shafts 22 are formed on the side plates at both ends, and the shaft holes 32 provided in the support plates 3 and 4 are formed. 42 and supported. On the other hand, the fixed blade 1 is also formed by bending the side plate 11 integrally with a sheet metal having a thickness of 2 mm. The side plate 11 is formed with an extrusion shaft 12 and inserted into a shaft hole 42 provided in the support plate 4. The other end of the support shaft was inserted into the hole 32 provided in the support plate 3 via the spring 6 and pressed against the movable blade 2. The support plates 3 and 4 were fixed to the base 5 using screws 7. Next, the shape of the example of the extrusion shaft will be described in detail. FIG. 2 shows a cross-sectional shape of a half-fin dowel (also referred to as embossing) that is generally used. The half-puffed dowel is pressed in the same way as the hole punching process,
Since the punch is stopped before the hole penetrates, the dowel is sheared from the surrounding sheet metal portion, and the dowel is separated. For this reason, when the fixed blade or the rotary blade is supported as a shaft and used as a shaft to which a relatively large repetitive load is applied, it is presumed that the blade may come off during use.
Therefore, as the extrusion shaft used in this example, an extrusion shaft having a cross-sectional shape shown in FIG. 3 was employed. The semi-aqueous dowel shown in FIG. 2 has almost the same size as the dowel diameter A and the hole diameter B, which are almost the same as the clearance between the press die and the punch, but as shown in FIG. If the pressing process was performed to achieve the diameter D, the extrusion shaft was not sheared, so it was not shaped so as to be separated from the surrounding sheet metal part. .

[0007]

As described above, according to the present invention, the movable blade for the sheet cutting device is provided with an extruding shaft by extrusion or the like on the side plate of the movable blade made of sheet metal. The structure that allows the extrusion shaft to be inserted into the shaft hole to support the shaft greatly reduces the number of parts in the sheet cutting device, thereby reducing assembly man-hours and costs for processing parts such as shafts. At the same time, the weight of the entire apparatus can be reduced. Furthermore, by applying the movable blade of the present invention, the number of components is reduced, so that dimensional accuracy can be improved, and a low-cost and highly reliable cutting device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a movable blade for a sheet cutting device and a sheet cutting device using the same according to the present invention.

FIG. 2 is a cross-sectional view showing an example of the shape of a half-fin dowel according to the present invention.

FIG. 3 is a cross-sectional view illustrating an example of an extrusion shaft used in an example according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed blade 11 Fixed blade side plate 12 Fixed blade extrusion shaft 2 Movable blade 21 Movable blade side plate 22 Movable blade extrusion shaft 3 Cutting start side support plate 32 Shaft hole of cutting start side support plate 4 Cutting end side support plate 42 Cutting end side support Shaft hole of plate 5 Space plate 6 Spring 7 Screw A Dowel diameter B Hole diameter C Shaft diameter D Large hole diameter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B26D 1/38

Claims (1)

(57) [Claims] 1. A movable blade formed by sheet metal forming which cuts a sheet material in cooperation with a fixed blade, comprising: a side plate press-formed on a side surface of the blade; and an extrusion shaft embossed on the side plate. The movable blade for a sheet cutting device, wherein the extrusion shaft serves as a support shaft for rotating the movable blade.