JP2713374B2 - Paper cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutter for cutting roll paper or folded continuous paper into arbitrary lengths or partially leaving uncut portions in an apparatus such as a facsimile or a printer. is there.

[0002]

2. Description of the Related Art Conventionally, a cutter device used for this kind of application includes a saw blade-shaped thin blade as described in Japanese Utility Model Laid-Open Publication No. Sho 62-172595 and a groove into which the blade enters. Are arranged facing each other, and the paper between them is cut by penetrating the cutting edge of the saw blade. Also,
As in the apparatus described in Japanese Utility Model Application Laid-Open No. 62-106792, an apparatus that sequentially cuts from one end to the other while cross-pressing the cutting edges of a pair of blades is widely used.

[0003]

Among the above-mentioned cutting apparatuses which are widely used in the past, the former using a saw-shaped blade is used to make a hole in a sheet with a sharp cutting edge of the blade.
Next, this hole is cut out and expanded, and cuts are performed in the order of cutting at the cutting edge of the valley, so that the paper is cut off by adjusting the indentation depth of the cutting edge of the saw blade, or partially perforated. You can leave behind. However, in this type of cutting device, the sharpness greatly depends on the sharpness of the tip of the cutting edge, and therefore, the cutting device is easily affected by wear of the cutting edge due to repeated use. In addition, it is difficult to prevent paper dust from accumulating and adhering to the valleys of the saw-toothed cutting edge.
Cleaning or blade replacement was required.

On the other hand, in the latter one having a so-called scissors structure in which a pair of blades are cross-welded, the paper is sheared by the pair of blades, so that cutting can be performed even if the blades are not very sharp. It is possible to maintain stable cutting for a long period of time without resharpening the cutting edge. This means that kitchen knives and knives used everyday
In order to maintain its sharpness, it is necessary to maintain a sharp cutting edge by regular polishing, whereas scissors originally do not have such a sharp cutting edge, and the cutting edge is also a knife or knife. It is clear in light of the experience that it does not require much maintenance. However, since the blades having a scissor structure are configured so that their cutting edges are sequentially cross-welded, it is difficult to form a perforated uncut portion. In other words, this type of scissors-type blade has a structure in which the pair of blades cross each other in both the shearing direction and the direction in which the blades are pressed against each other.

[0005] Therefore, even if a notch groove for forming an uncut portion is provided on one of the cutting edges, it is already formed by cutting into the sheet on the cutting start side where cutting has been completed and pushing the sheet in the cutting direction. The blade itself tears off the left uncut part. When the crossing angle of the cutting edge in the pressing direction is large, the remaining uncut portion is also torn by the cutting tool itself by the movement of the cutting edge in this direction. Further, when the crossing angle of the blades in the pressing direction is large, there is also a problem that the blade edges are caught at the groove edge portion of the blade edge provided for forming the uncut portion. For this reason, with a blade with scissors structure, even if you try to leave an uncut portion on a part of the paper, the cutting can be stopped at most on the way and cut off at one end, and the paper will break due to handling. It was easy to perform, and was extremely imperfect as perforated paper.

[0006]

SUMMARY OF THE INVENTION A paper cutter according to the present invention comprises a thin plate-shaped movable blade having a V-shaped cutting edge, and a fixed blade for pressing the cutting edge against the movable blade. A warp such that a central portion in a cutting width direction becomes a vertex is given by a base metal that restrains the movable blade, and the warp is caused by the elasticity of the movable blade, and the direction is a fixed blade. A paper cutter characterized in that it is convex in the direction of pressing against the paper cutter. By providing a cutout portion in at least one of the movable blade and the fixed blade, an uncut portion can be formed on the paper to be cut and cut. In addition, by providing a structure in which projections in the cutting direction are provided at both ends of the movable blade in order to guide the engagement of the blade edge, a gap for paper insertion provided between the movable blade and the fixed blade can be widened. It is characterized by the following.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The movable blade of the present invention has a V-shaped concave cutting edge line, and the movable blade has a warp such that a central portion in a cutting width direction becomes an apex by a restraining metal. Moreover, since the warp of the movable blade is convex in the direction of pressing against the fixed blade and is a thin plate having high elasticity, both blades are uniformly pressed from the beginning to the end while cutting and pressing the blades sequentially from both ends. With the pressure contact force, the paper can be cut from both ends toward the center by the same structure as the scissors.
Since the movable blade is a thin plate, the cutting edge of the portion where cutting has been completed falls into the sheet and does not push the sheet itself. Therefore, when a notch for forming an uncut portion is provided at the center of the movable blade, it is possible to perform cutting while leaving only this portion. When one or a plurality of notched grooves are formed in a part of the movable blade, the cutting can be performed while leaving the connected portion in a perforated shape. In this case, the crossing angle of the blades in the pressure contact direction is given by the warpage of the blades in the cutting width direction. Therefore, the closer the position of the notch groove is to the center of the movable blade, the smaller the crossing angle becomes. Can be suppressed.

[0008]

FIG. 1 shows an embodiment of a paper cutter according to the present invention. A movable blade 11 is fixed to a movable blade base 12 having projections 19 at both ends by screws 110 at the center. Since the movable blade base 12 has higher rigidity than the movable blade 11, the movable blade 11 is in a state in which the fixed blade 15 has a convex warpage. Therefore, the fixed blade tip 17 may have a straight shape without any warp, and is easy to manufacture.

FIG. 2 shows an example of the shape of the cutting edge of the movable blade of the paper cutter of the present invention. (A)
Since it has a groove in the center, it can be cut while leaving this portion uncut. As shown in (b), the notch in the center has a V-shaped blade, so that the movable blade can be adjusted to adjust the stroke so that the paper is left uncut or the entire width of the paper is cut. can do. (C) has two notches on the left and right in addition to the notch at the center, so that the sheet can be cut with a total of three uncut portions. In this cutter, since the blade of the movable blade is a thin plate, the blade edges at both ends that have completed cutting move downward through the paper, and the paper itself remains at the position of the blade edge of the fixed blade. There is no separation of the remaining part. When the thickness of the movable blade exceeds 1.5 mm, irregular breakage occurs around the blade 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 desirably 1 mm or less.

The cutting edges of both blades have a structure in which the cutting edges are warped in the pressing direction, and the crossing of the cutting edges in the pressing direction is provided. Therefore, as the position of the notch is closer to the center, the cutting edges in this portion are closer to each other. The catch can be suppressed to a small one.
In (d), the movable blade is provided with projections at both ends of the blade to guide the engagement of the blade edge, so that a gap for paper insertion provided between the movable blade and the fixed blade can be widened. FIG. 3 shows another embodiment of the structure of the movable blade of the paper cutter of the present invention. In the example of FIG. 1, the movable blade is fixed to a movable blade base having protrusions at both ends at a central portion so that the central portion in the cutting direction of the movable blade is a vertex of warpage. In this embodiment, the movable blade base 36 and the movable blade 35 are separated from each other. A protrusion 39 is provided at the center of the movable blade base 36, and the movable blade 35 is fixed to a screw hole by screws 310 at both ends. It is possible to easily give the blade edge 37 a warp such that the central portion in the cutting direction of the movable blade becomes the top of the warp.

FIG. 4 shows another embodiment of the paper cutter according to the present invention, in which a movable blade 41 is mounted on a movable blade base 42 and a driving force from a driving source (not shown) via an arm 414 and a driving shaft 415. Reciprocate. The pressing force of the movable blade against the fixed blade is adjusted by the spring 411 and the stopper 416,
Further, a paper guide plate 413 is provided to reliably feed the material to be cut.

[0012]

The paper cutter of the present invention has a highly reliable structure in which paper is sheared by the same principle as scissors, and it is possible to partially leave uncut paper if necessary. The conventional cutter having a saw blade can be used in the same manner, and the thin cutter is used as the movable blade, so that the cutter device can be downsized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an example of a blade shape of a movable blade.

FIG. 3 is a perspective view showing another structure of the movable blade.

FIG. 4 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 11 movable blade, 12 movable blade base, 15 fixed blade, 17 fixed blade tip, 19 projection 110 screw, 35 movable blade, 36 movable blade base, 37 movable blade tip, 39 projection, 310 screw, 41 movable blade, 4
2 Movable blade base, 45 fixed blade, 48 frame, 411
Spring, 413 Paper guide plate, 414 Arm, 415 Drive shaft, 416 Stopper

Claims (3)

(57) [Claims] 1. A thin plate-shaped movable blade having a V-shaped cutting edge having a cutting edge and a fixed blade pressing the cutting edge against the movable blade, wherein the movable blade is fixed by a metal base for restraining the movable blade. ,
A warp is provided such that a central portion in the cutting width direction becomes a vertex, and the warp is due to the elasticity of the movable blade, and the direction is convex in a direction of pressing against the fixed blade. Paper cutter to do. 2. A structure in which at least one of a movable blade and a fixed blade has a cutout portion.
The paper cutter described in. 3. The paper cutter according to claim 1, wherein a projecting portion in a cutting direction for guiding engagement of the cutting edge is provided at both ends of the movable blade.