JP3191124B2 - 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 communication facsimile,
The present invention relates to a sheet cutting device used for various printers, copying machines, and the like.

[0002]

2. Description of the Related Art An apparatus for cutting a sheet by pressing a cutting edge of a disk blade, which is a movable blade, to a fixed blade always has a fixed blade fixed to the fixed blade in order to stably cut the sheet at a smooth cut edge. Various methods have been conventionally proposed as a method for pressing a disk blade against a fixed blade, since the pressure must be pressed and, in some cases, the pressing force must be easily adjusted. Conventionally, as this type of sheet cutting apparatus, Japanese Patent Laid-Open Publication No.
Japanese Unexamined Patent Publication No. 95-57, and Japanese Utility Model Laid-Open Publication No. Sho 57-77261 have disclosed a cutting device. The sheet cutting device disclosed in Japanese Patent Application Laid-Open No. 1-240295 has a structure in which a disc blade is sandwiched between two leaf spring materials, and one of the leaf spring materials has a structure that also functions as a fixed blade. Is what it is.
On the other hand, the cutting device disclosed in Japanese Utility Model Laid-Open No. 57-77261 is composed of two circular blades supported by two drive shafts, one side of which is pressed against the other disk blade by a spring. It is a so-called slit type device having a structure.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open Publication No. 1-2
The conventional apparatus disclosed in Japanese Patent No. 40295 has a structure in which a round blade is sandwiched between two leaf springs also serving as fixed blades, so that chips or the like of paper fall between the leaf springs. There is a problem that the meshing becomes unstable, the meshing becomes unstable, and the sharpness deteriorates. There is also a problem that the rotation of the round blade becomes unstable because the round blade is sandwiched between the leaf springs. Further, the conventional apparatus disclosed in the above-mentioned Japanese Utility Model Application Laid-Open No. 57-77261 is a cutting apparatus called a slit type for cutting two circular blades by pressing each other by pressing each other. A spring is used as a method for pressing against the disk blade, and a tapered coil spring is illustrated as the spring in the drawings of the embodiment.

However, in the method of mounting the tapered coil spring, the large-diameter side is on the disk blade side, and the small-diameter side is the stop collar side, so that the rotational resistance of the disk blade increases, causing variations in rotation and smoothness. It was found that there was a problem that it was not possible to make a sharp cut. The present invention solves the above-mentioned problems, and adopts a cutting device that presses the blade edge of a disk blade against a straight fixed blade instead of the structure of the disk blade rotating together, so that the rotation of the disk blade is smooth. It is intended to provide a sheet cutting device capable of obtaining a clean cut edge.

[0005]

SUMMARY OF THE INVENTION The present inventor has proposed a cutting device in which a disk blade is pressed against a straight fixed blade, and the disk blade is driven only in a reciprocating manner without being rotated, and is rotated by a pressing force against the fixed blade. The present invention was completed while examining a cutting device capable of smoothly rotating a disk blade to obtain a clean cut edge and further reducing the size of the cutting device according to the demands of the times. More specifically, the present invention has a straight blade edge, and has a fixed blade mounted in a direction perpendicular to the longitudinal direction of the sheet with respect to the traveling direction of the sheet, and an axis parallel to the traveling direction of the sheet. A blade provided on an outer periphery of the disk blade for pressing against the fixed blade. The disk blade has a small diameter side around the axis of the disk blade and a large diameter side as a support device side. A sheet cutting device characterized by being pressed by a tapered coil spring mounted in a direction.

[0006]

According to the present invention, when the disk blade is pressed against a fixed blade having a straight blade structure and the disk blade slides along the fixed blade, the disk blade can be automatically rotated. Another major feature is that a tapered coil spring is used as a means for pressing the rotary blade against the fixed blade, and the mounting direction is defined. That is, by setting the small-diameter side of the tapered coil spring to the disk blade side, the rotation of the disk blade can be made smooth.

[0007] The use of a tapered coil spring is also an effective method for reducing the size of the supporting device for the rotary blade. Since the tapered coil spring has a shape in which the spring wire is wound on a cone, it can be stored in the space width occupied by the element wire diameter when compressed to close contact in the direction of the shaft center line, and the spring constant is reduced. Can be set. For this reason, it has become possible to keep the pressing force of the circular blade, which is easily affected by variations in component accuracy, on the fixed blade constant. Furthermore, when the disc blade is pressed against the small diameter side of the tapered coil spring wound in a conical shape, the contact area between the tapered coil spring and the disc blade is reduced, so that the rotation resistance generated during rotation is reduced, and the disc during cutting is reduced. Because the blade can be rotated smoothly,
It was also proved that the sharpness of the sheet was improved and a clean cut was obtained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments and drawings.
FIG. 1 is a perspective view showing one embodiment of the sheet cutting apparatus of the present invention, and FIG. 2 is a sectional view. The fixed blade 6 provided at right angles to the traveling direction of the sheet 8 as the material to be cut is fixed to the frame 7 by any fixing means. Disk blade 3
Is rotatably supported by the rotating shaft 4 and is pressed against the fixed blade 6 by the tapered coil spring 5 provided on the rotating shaft core. The tapered coil spring 5 is mounted in such a direction that the small diameter side contacts the disk blade 3 and the large diameter side contacts the support device 1. The rotating shaft 4 that rotatably supports the disk blade 3 and the tapered coil spring 5 has both ends of the shaft supported by a part of the support device 1.

The position opposite to the position where the disk blade of the support device 1 is mounted is fitted into the groove of the slide rail 2 and reciprocating movement is performed with the disk blade pressed against the fixed blade by a driving device (not shown). And cut the sheet. A cutting test of the sheet was performed by the cutting apparatus having such a structure. The disk blade rotated smoothly and could be cut with a clean cut. A cutting test was also performed with a tapered coil spring in which the space in which the tapered coil spring was mounted was reduced to such an extent that the tapered coil spring was compressed to become a dish shape. In the present invention,
Since a tapered coil spring is used, the pressure contact force of the disk blade to the fixed blade can be kept almost constant, and there is almost no need to adjust the pressure contact force by changing the contraction amount of the spring. However, when it is necessary to finely adjust the pressure contact force, it is sufficient to devise so that the space in which the coil spring is mounted can be changed.

[0010]

According to the present invention, in a sheet cutting apparatus comprising a fixed blade having a straight blade and a disk blade for pressing the blade against the fixed blade, a taper coil spring is used as a means for pressing the disk blade. As a result, the rotation of the disk blade becomes stable and smooth, so that a clean cut edge can be obtained and the cutting performance can be greatly improved, so that a high-quality, low-cost sheet cutting device can be supplied.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a sheet cutting apparatus according to the present invention.

FIG. 2 shows an embodiment of the sheet cutting apparatus according to the present invention.
FIG.

[Explanation of symbols]

1 support device, 2 slide rail, 3 disk blade, 4
Rotary axis, 5 taper coil spring, 6 fixed blade, 7 frame, 8 seat, 8a Sheet traveling direction

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B26D 1/14 B26D 1/18 B26D 7/26

Claims (1)

(57) [Claims] 1. A fixed blade having a straight blade edge, the longitudinal direction of which is mounted in a direction perpendicular to the sheet advancing direction, and a shaft center parallel to the sheet advancing direction, provided on the outer periphery. The fixed blade is pressed against the fixed blade, and the disk blade is mounted around the axis of the disk blade in such a direction that the small diameter side is the disk blade side and the large diameter side is the support device side. A sheet cutting device characterized by being pressed by a tapered coil spring.