JPH0822517B2 - Paper cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention cuts roll paper or folding continuous paper to an arbitrary length or partially cuts it with an uncut portion in a device such as a facsimile or a printer. For paper cutter for.

[Conventional technology]

As a conventional cutter device used for this kind of application, a saw blade-shaped thin blade tool and a groove into which this tool is recessed are opposed to each other as described in Japanese Utility Model Laid-Open No. 62-172595. It is widely used to arrange and cut the paper between them by penetrating the blade edge of the saw blade.

Further, as in the device described in Japanese Utility Model Laid-Open No. 62-106792, a device that sequentially cuts a pair of blades from one end to the other end while cross-contacting them is widely used.

[Problems to be Solved by the Invention]

Among the above-mentioned widely used cutting devices, the former one using a saw-toothed blade makes a hole in a sheet with a sharp cutting edge of the cutting edge, then expands this hole and cuts at the valley edge. Since the cutting is performed in order, it is possible to cut the paper by partially adjusting the depth of the indentation of the blade edge of the saw blade, or to partially leave a perforation-like uncut portion.

However, in this type of cutting device, the sharpness largely depends on the sharpness of the tip of the cutting edge, and is therefore easily affected by the wear of the cutting edge due to repeated use. Further, it is unavoidable that paper dust accumulates and adheres to the troughs of the saw-toothed blade edge, and it was necessary to periodically re-polish the blade edge, clean or replace the blade.

On the other hand, in the latter one having a structure of so-called scissors that cross-contacts a pair of blades, since the paper is sheared by the pair of blade edges, it is possible to perform cutting even if the blade edges are not very sharp, and the blade edges are regularly sharpened. It is possible to maintain stable cutting for a long period of time without repairing.

This means that knives and knives used daily must maintain a sharp cutting edge by regular polishing to maintain their sharpness, whereas scissors originally have such a sharp cutting edge. No, and it is clear from the experience that the cutting edge does not require as much care as a knife or knife.

However, since the blade having the scissors structure has a structure in which the blade edges of the scissors are sequentially cross-welded to each other, it is difficult to form a perforation-like uncut portion. That is, in this type of scissors-shaped cutting tool, the pair of cutting edges has a structure in which the cutting edges intersect in both the shearing direction and the direction in which the mutual cutting edges are pressed against each other.

Therefore, even if one of the cutting edges is provided with a notch groove for forming an uncut portion, the uncut portion that has already been formed is pressed into the cutting start side sheet by pressing the sheet in the cutting direction. The blade itself tears off the part. Also, when the crossing angle of the cutting edge in the pressure welding direction is large,
By the movement of the cutting edge in this direction, the uncut portion that is also formed is torn off by the cutting tool itself.

Further, when the crossing angle of the blade in the pressing direction is large, there is a problem that the blade edges are caught at the groove edge portion of the blade edge provided to form the uncut portion.

For this reason, with a blade having a structure of scissors, even if you try to leave an uncut portion on a part of the paper, at most you can stop cutting at the middle and leave it at one end, and the paper will be broken for handling. It was very incomplete as perforated paper.

[Means for solving the problem]

A first aspect of the present invention comprises a thin plate-shaped movable blade having a cutting edge with a V-shaped concave cutting edge line and a fixed blade that presses the cutting edge against the movable blade, and at least one of the fixed blade and the movable blade has these blades. And a base metal integrated with the base metal, and at least one of the blades has a warp in the cutting width direction by the base metal, and the direction of the warp is convex in the pressing direction to the opposing blade. It is a paper cutter, and the cutting edge line is V in the second invention.
A structure that consists of a thin plate-shaped movable blade with a V-shaped recessed blade and a fixed blade that presses the blade edge against this, and the fixed blade has a warp in the pressing direction in a direction that is convex in the cutting width direction with respect to the movable blade. It is a paper cutter characterized by being. Then, it is preferable that the apex of the warp of the second aspect of the invention is present at the central portion in the cutting width direction. A third invention is composed of a thin plate-shaped movable blade having a cutting blade having a V-shaped concave cutting edge line and a fixed blade for pressing the cutting edge against the movable blade, and at least one cutting tool has a warp in a cutting width direction. The direction of the warp is convex in the direction of pressure contact with the opposing blade, and the warp in the direction of pressure contact is formed by a protrusion provided only in the widthwise central portion of the movable blade or the fixed blade. It is a cutter.

Further, in the paper cutter according to the first invention or the third invention, it is desirable that the fixed blade has a warp with respect to the movable blade. Further, in the paper cutter according to the second aspect of the invention, the movable blade may have a warp with respect to the fixed blade. Further, when the present invention is characterized in that at least one of the movable blade and the fixed blade is provided with a cutout portion, it is possible to form an uncut portion on the paper to be cut. In addition, a structure is provided in which both ends of the movable blade are provided with protrusions in the cutting direction for guiding the meshing of the blade edges, so that a wide gap can be provided between the fixed blade and the fixed blade for inserting paper. It is characterized by.

[Action]

The thin plate-shaped movable blade has a V-shaped cutting edge line, and at least one of the fixed blade and the movable blade has a metal base that is integrated with these blades, and at least one of the blades has a cutting width. There is a warp in the direction, and the direction of this warp is convex in the direction of pressure contact with the opposing blade, or there is a warp in the direction of pressure contact with the fixed blade protruding in the cutting width direction with respect to the movable blade. With this structure, both blade edges cut from both ends toward the center of the paper by a structure similar to scissors, while sequentially cross-contacting the blade edges from both ends.

Since the movable blade is a thin plate, the blade edge of the portion where the cutting is completed does not dent into the paper and press the paper itself. Therefore, when a notch for forming an uncut portion is provided in the central portion of the movable blade, it is possible to perform cutting while leaving only this portion.

Further, when one or a plurality of notched grooves are formed in a part of the movable blade, it is possible to perform cutting with a perforation-like connecting portion left. In this case, since the crossing angle of the blades in the press contact direction is given by the warp of the blades, the crossing angle becomes smaller as the position of the notch groove is closer to the center of the movable blade, so the catching of the cutting edges should be suppressed. You can

〔Example〕

FIG. 1 shows an embodiment of the paper cutter of the present invention, in which the movable blade 11 is made of quenching heat-treated carbon tool steel (JIS SK5) having a thickness of 0.5 mm, and has a V-shape with a blade width of 80 mm. It has a movable blade edge 13 which is recessed in, and is attached to a frame 18 slidably in the vertical direction (shearing direction).

The fixed blade 15 is rotatably supported by support shafts at both ends, and its fixed blade edge 17 is pressed against the movable blade 11 by a spring 111, and the fixed blade edge 17 is pressed against the movable blade 11. It has a convex warp of about 0.25 mm at the center.

The sheet (not shown) sent through the passage window 112 provided in the frame 18 is cut toward the center from both ends when the movable blade 11 moves downward, and the cutting is finished at the center. Since the fixed blade edge 17 has a slightly convex center portion and is in pressure contact with the movable blade 11, both edges are cut with both ends having exactly the same structure as the scissors.

FIG. 2 shows another embodiment of the movable blade and the fixed blade of the paper cutter of the present invention. The movable blade 21 is fixed to the movable blade base 22 having protrusions 29 at both ends at the center with a screw 210. Since the movable blade base metal 22 has a rigidity higher than that of the movable blade 21, the movable blade 21 is in a state of having a convex warp with respect to the fixed blade 25. Therefore, the fixed blade edge 27 may have a straight shape with no warp and is easy to manufacture.

FIG. 3 shows an example of the edge shape of the movable blade of the paper cutter of the present invention.

Since the one shown in (a) has a groove in the center,
This part can be cut and left uncut.

In the case shown in (b), the notch in the center part has a V-shaped blade shape, so by adjusting the stroke of the movable blade, there is an uncut portion on the paper, or the entire width of the paper is cut. can do.

In addition to the central cutout, the one shown in (c) also has two cutouts on the left and right, so that the paper can be cut with a total of three cutouts. In this cutter, the blade of the movable blade is a thin plate, so the blade edges at both ends that have completed cutting pass through the paper and move downward, and the paper itself stays at the position of the blade tip of the fixed blade. There is no separation of the remaining part. The thickness of the movable blade is 1.5m
If m exceeds m, irregular breaks occur around the paper when the blade penetrates the paper, and in general office paper, the movable blade itself tends to tear off the uncut portion. For the purpose of cutting such general office paper, the thickness of the movable blade of the present invention is preferably 1 mm or less.

The blade edges of both blades have a structure in which the blade edges are warped in the pressure contact direction, and the blade edges intersect in the pressure contact direction.Therefore, the closer the notch position is to the center, the less likely it is that the blade edges will be caught at this part. It can be suppressed to anything.

In the structure shown in (d), the movable blade is provided with protrusions at both ends to serve as guides for meshing of the blade edges, and it is possible to widen a gap for paper insertion provided between the movable blade and the fixed blade.

FIG. 4 shows another embodiment of the structure of the fixed blade of the paper cutter of the present invention. In the example shown in FIG. 1, the fixed blade is shown as an integral unit, but in the embodiment shown in FIG. 4, it is structured such that it is separated into a fixed blade base metal 46 and a fixed blade 45, and a projection is formed at the center of the fixed blade base metal 46. 49, fixed blade 45 with screws 410 on both ends
If the fixed blade edge 47 is fixed to the threaded hole by using, it is possible to easily give a desired convex warp to the fixed blade edge 47.

FIG. 5 shows still another embodiment of the structure of the fixed blade of the paper cutter of the present invention.

The thin plate-shaped fixed blade 55 has guide portions for the movable blade 51 at both ends thereof.
While pressing 54, the lower central part is fixed by screws 510. With this mounting structure, the fixed blade 55 has a convex shape in the pressure contact direction with the movable blade 51, and at the same time, the fixed blade 55
Since the blade edge can be pressed against the movable blade 51 by the elasticity of 55 itself, the structure of the cutter can be remarkably simple.

FIG. 6 shows another embodiment of the paper cutter of the present invention, in which the movable blade 61 is attached to the movable blade base 62, the arm 614,
It reciprocates by a driving force from a driving source (not shown) via the driving shaft 615. The contact pressure of the movable blade to the fixed blade is spring 611.
The sheet guide plate 613 is further provided for adjustment by the stopper 616, and the material to be cut is reliably fed.

〔The invention's effect〕

The paper cutter of the present invention has a highly reliable structure in which paper is sheared according to the same principle as scissors, and it is also possible to partially leave uncut paper on the paper, so that the conventional scissor blade The cutter has the feature that it can be used in the same manner as the cutter having the blade tip and that the cutter device can be made small because a thin plate is used as the movable blade.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view of an embodiment showing another structure of a blade, and FIG. 3 is a front view showing an example of a blade shape of a movable blade, and FIG. FIG. 5 is a perspective view showing another structure of the fixed blade, FIG. 5 is a perspective view showing still another structure of the fixed blade,
FIG. 6 is a perspective view showing another embodiment of the present invention. 11,21,51,61: Movable blade, 15,25,45,55,65: Fixed blade

Claims (8)

[Claims] 1. A thin plate-shaped movable blade having a cutting edge with a V-shaped concave edge line and a fixed blade that presses the blade edge against the movable blade, at least one of the fixed blade and the movable blade being integral with these blades. A paper cutter, comprising: a base metal, wherein at least one of the blades has a warp in a cutting width direction due to the alloy, and the direction of the warp is convex in a pressure contact direction with the blade as a partner. 2. A direction comprising a thin plate-shaped movable blade having a V-shaped concave cutting edge and a fixed blade pressing the cutting edge against the movable blade, wherein the fixed blade is convex in the cutting width direction with respect to the movable blade. A paper cutter characterized in that it has a structure with a warp in the press contact direction. 3. The paper cutter according to claim 2, wherein the apex of the warp is present in the central portion in the cutting width direction. 4. A thin plate-shaped movable blade having a cutting edge having a V-shaped concave edge line, and a fixed blade that presses the edge of the blade against at least one of the blades, and at least one of the blades has a warp in the cutting width direction. The paper cutter is characterized in that the direction of is convex in the direction of pressure contact with the other blade, and the warp in the direction of pressure contact is formed by a protrusion provided only at the center of the movable blade or fixed blade in the width direction. . 5. The paper cutter according to claim 1, wherein the fixed blade has a warp with respect to the movable blade. 6. The paper cutter according to claim 2, wherein the movable blade has a warp with respect to the fixed blade. 7. The paper cutter according to claim 1, wherein at least one of the movable blade and the fixed blade is provided with a cutout portion. 8. The paper cutter according to claim 1, wherein both ends of the movable blade are provided with protrusions in the cutting direction for guiding the meshing of the blade edges.