JP2582850Y2 - Sheet cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a sheet cutting device used for a facsimile for a communication device, various printers, a copying machine, and the like.

[Conventional technology]

The general type of the sheet cutting device is composed of a rotary blade and a fixed blade, both of which are rotatably supported on the shaft and neck at both ends, and the rotary blade causes the trajectory of the cutting edge line to be a cylindrical surface or a one-lobe hyperbolic rotary surface due to its rotation. Etc., while the fixed blade,
A type in which a blade edge line parallel or substantially parallel to the rotation axis by the rotary support is pressed against the blade edge line of the rotary blade by a spring around the rotation axis (oscillating fixed blade). There are many things.

In the sheet cutting apparatus of the above type, the biasing of the fixed blade by a spring is generally performed by implanting a pin on the fixed blade at right angles to the rotation axis thereof, and applying a tension coil spring between the tip and the following frame. In many cases, the frame that supports the rotating blade and the fixed blade has a U-shape in the assembled state, and the shaft holes at both ends of both blades are rotatably supported by bearing holes provided on the two sides at both ends. Is what you do.

[Problems to be solved by the invention]

In general, the above-mentioned frame is generally formed by attaching and assembling L-shaped brackets having bearing holes at both ends of a base material arranged in parallel with both blades with screws or the like. If a strip-shaped material provided with a bearing through-hole at a predetermined position of the portion is integrated by bending and forming into a U-shape, it is convenient from the viewpoint of weight reduction and cost. However, in this case, it is necessary to devise a method of assembling the two blades and the frame.

The present invention is particularly suitable for an integrated frame,
It is an object of the present invention to provide a sheet cutting device that can reduce the weight and cost by improving the method of supporting a fixed blade.

[Means for solving the problem]

In the present invention, the frame, the rotary blade, and the shaft necks at both ends are rotatably supported by bearing holes provided in the frame, and the blade is rotated around the rotation axis as the blade is pressed against the blade of the rotary blade. In a sheet cutting apparatus comprising a biased fixed blade, the fixed blade has a compression torsion coil spring fitted and mounted on a base of the shaft neck at one end, and has another shaft neck at the other end. When the distal end of the one end of the shaft and neck is inserted into one bearing hole of the frame by compressing the compression torsion coil spring in the axial direction, the other end of the shaft and neck is inserted into the other bearing from the inside of the frame. The length between the shaft and the neck which can be inserted into the hole, the relationship is such that the entire fixed blade is assembled by moving in the direction of the other bearing hole by the repulsive force of the compression torsion coil spring, and the fixed blade is By the compression torsion coil spring, A sheet cutting device characterized in that it is serial rotationally urged.

[Action]

The present invention enables simplification of the frame, and regulates the axial position of the fixed blade and the rotational bias for pressing against the blade edge of the fixed blade with one compression torsion coil spring. Therefore, the entire cutting device can be greatly simplified and lightened, and the cost can be reduced.

Unlike the rotary blade, the fixed blade only swings in a small angle range, so the need for high strength and high precision shaft support is low, and it has been proved that the method of the present invention is sufficient.

In the present invention, the compression torsion coil spring is a torsion coil spring defined in JIS B2709 that can absorb the compression force in the axial direction, for example, by winding the coil portion at intervals and expanding the lever portion in the axial direction. I do.

〔Example〕

FIG. 1A is a front view of one embodiment of the present invention, and FIG.
Is an XX cross-sectional view thereof. The frame 3 is manufactured by bending a strip-shaped material provided with through bearing holes at both ends in advance into a U-shape, and the inner dimension between both sides is set to a dimension w.

Both the rotary blade 1 and the fixed blade 2 are rotatably supported by bearing holes which are through holes provided in the frame 3 with the shaft necks 5, 6 and 7, 8 at both ends thereof. The rotary blade 1 is composed of a rotary blade body 1a having an outer ridge of a U-shaped middle side as a blade edge 1e, and a shaft 1b which is inserted into through holes provided in both sides in a skewered manner and caulked and fixed to the holes. Approximately both end portions of the shaft 1b form the shaft necks 5 and 6, and are rotated by a rotary solenoid (not shown) provided on the shaft neck 5 side in the direction of arrow 1c {FIG.
Is driven to rotate.

The fixed blade 2 has a blade edge 2e at the center of its length, and has shaft necks 7 and 8 formed at both ends. A compression torsion coil spring 4c is fitted to the base of the shaft neck 7 at one end. It is mounted.
The fixed blade 2 and the frame 3 are inserted into one bearing hole of the frame 3 at one end of the shaft neck 7, compress the compression torsion coil spring 4 c, and connect the shaft neck 8 at the other end to the other of the frame 3. This is related to the case where the fixed blade 2 is assembled by moving the entire fixed blade 2 in the direction of the other bearing hole by facing the bearing hole (w ≧
l) The fixed blade 2 is rotationally urged by the compression torsion coil spring 4c so that the cutting edge 2e is pressed against the cutting edge of the rotary blade 1 . And the strength of the rotation bias is the compression torsion coil spring
The bent portion at the tip of the square portion at the end of 4c can be adjusted by selecting any one of a large number of hole groups 3a provided on the frame 3 in an arc.

Reference numeral 2a denotes a blade edge guide provided at the cutting start end of the fixed blade 2.

In the above embodiment, the rotating blade 1 and the fixed blade 2 are constituted by the rotating blade 1 comprising the main body 1a and the shaft 1b, and the shaft 1b is inserted into the bearing hole of the frame 3 and then combined with the main body 1a. The frame 3 is supported by a common frame 3 to simplify the frame 3.

FIG. 2 shows that the two sides of the U-shape of the frame 3 are bent and formed so as to be perpendicular to the rotation axis of the rotary blade 1.
1 to maintain the rotational accuracy, and also use a compression torsion coil spring 4
a, the coil part, which is relatively easy to manufacture, is tightly wound,
Instead, the corner of the coil end is bent into a dog leg shape to achieve the compression spring function.

In the above embodiments, the blade edge is parallel to the rotation axis as a fixed blade, and in order to obtain a shear angle, the rotation axis is set relative to the fixed blade.
The present invention is not limited to this, but can be applied to various types of rotary blades.

In addition, in the assembled state of the cutting device of the present invention, it is generally desirable that the compression torsion coil springs 4a and 4c are in a state of appropriately applying a compressive force from the viewpoint of vibration generation and the like, but the present invention is not limited thereto.

[Effect of the invention]

In the present invention, in a sheet cutting apparatus having a so-called swinging fixed blade, a frame and a compressive force applying mechanism can be greatly simplified by revising a conventional assembling relationship between a fixed blade and a frame. This makes it possible to simplify the assembly line and reduce costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are views showing an embodiment of a sheet cutting apparatus according to the present invention. 1 : Rotary blade, 1a: Fixed blade body, 1b: Shaft, 1e: Blade edge, 2: Fixed blade, 2e: Blade edge, 3: Frame, 3a: Hole group, 4a: Compression torsion coil spring, 4c: Compression torsion coil spring , 5,6,7,8: Shaft neck.

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-1-162846 (JP, A) JP-A 2-66989 (JP, U) JP-A 62-32790 (JP, U) JP-A 61-162 205791 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B26D 1/38

Claims (1)

(57) [Scope of request for utility model registration] 1. A frame, a rotary blade, and a shaft neck at both ends are rotatably supported by bearing holes provided in the frame, and the cutting edge is pressed around the rotating shaft so as to press against the cutting edge of the rotary blade. In a sheet cutting device comprising a fixed blade that is rotationally biased, the fixed blade has a compression torsion coil spring fitted and mounted on a base of the shaft neck at one end, and has another shaft neck at the other end. When the tip of the shaft neck at one end is inserted into one bearing hole of the frame by compressing the compression torsion coil spring in the axial direction, the shaft neck at the other end is inserted from the inside of the frame to the other end. The length between the shaft and the neck which can be inserted into the bearing hole, the fixed blade is moved in the direction of the other bearing hole by the repulsive force of the compression torsion coil spring, and the fixed blade is assembled. By the compression torsion coil spring Sheet cutting device characterized in that it is the rotation urging.