JP2005103745A - Cutter for perforated paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of unstable cutting of paper caused by interference between blades when cutouts are formed in a movable blade for leaving a plurality of portions uncut, in a paper cutter using a pair of blades of a movable blade and a fixed blade. <P>SOLUTION: Sharp projections are formed to a blade edge on a rear side in a cut direction of the cutouts of the movable blade to pierce and perforate a sheet material and project on the fixed blade. Inclinations are formed in the tips of the projections or the corresponding position of the fixed blade to avoid interference between the tips of the sharp projections with the fixed blade and to invite mutual biting of the blade edges. Therefore, cutting of perforated paper with uncut portions is stably performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutter for cutting a sheet material such as a roll paper or a folded continuous paper with an uncut portion (perforation) at an arbitrary position in an apparatus such as a printer or a facsimile.

  As a conventional paper cutter of this type, there is a thin plate-like movable blade having a V-shaped cutting blade and a fixed blade that presses the blade tip against the movable blade, and the movable blade is provided with a notch (for example, Patent Document 1). reference.).

Hereinafter, a conventional perforated paper cutter will be described with reference to FIG. 8 to FIG. 10. FIG. 8 is a front view showing a state in which cutting is performed immediately before the uncut portion, and FIG. 9 and FIG. A DD line cross section and an EE line cross section are shown.
Japanese Patent Laid-Open No. 1-289697

  In a cutter having a structure in which a sheet material is sheared by using a pair of blades of a movable blade and a fixed blade, both blade edges have a cutting direction that gives a shear angle, and a pressure contact direction to obtain a reliable engagement between the blade edges. In the conventional paper cutter described above, the fixed blade 51 stays in the same position after the cutting to the notch 54 of the movable blade 50, and then cuts. The interference margin C is generated at both cutting edges at the position where the cutting starts (cross-sectional position along the line EE in FIG. 8).

  Since the interference margin C is very small, if the idling operation is repeated after assembling the paper cutter, the blade edge of this part can be worn and made drivable. In addition to being disadvantageous in terms of durability, it is not necessary for industrial production to produce moderate wear due to idling operation, which is not suitable for industrial production. .

  The perforated paper cutter according to the present invention is a paper cutter that shears a sheet material with a pair of blades of a movable blade and a fixed blade, and the movable blade having a thickness of 1.5 mm or less has a partial uncut (perforation). In order to form, a notch is provided in the middle portion thereof, a sharp protrusion protruding toward the fixed blade is provided on the cutting end side of the notch, and the tip or the position corresponding to the tip of the fixed blade Further, a gradient is provided to induce the engagement of the blade edges while avoiding interference between the tip and the fixed blade.

  In the perforated paper cutter of the present invention having such a structure, after forming the uncut portion at the notch portion of the movable blade, the movable blade descends while the sharp projections pierce the sheet material and punches, and then the fixed blade again. Begins meshing with the blade edge and resumes shearing of the sheet material.

  As described above, the present invention can provide a perforated paper cutter with stable performance by simply processing the blade in this way and without adjusting the idling after assembly.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 to 4 show a first embodiment of the present invention, FIG. 1 is an overall perspective view, FIG. 2 is an enlarged perspective view of a notch portion of a movable blade, FIG. 3 is an overall front view, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  In FIG. 1, a movable blade 10 and a fixed blade 11 are attached to a frame 12, the movable blade 10 can be moved up and down, the fixed blade 11 is rotatably supported, and its blade tip is supported by a spring 13. The movable blade 10 is in pressure contact.

  The movable blade 10 has a notch 14 for making a notch, and a sharp projection 15 projecting toward the fixed blade 11 is provided at the cutting end of the notch 14 at the end of cutting. Is processed with a gradient 16 that avoids interference with the fixed blade 11.

  In the perforated paper cutter of Example 1 configured as described above, the movable blade 10 forms the uncut portion by the notch 14, and then the sharp protrusion 15 pierces the sheet material (not shown) while perforating. The sheet material is sheared again from the position where it is lowered and the mesh with the fixed blade 11 is obtained.

  FIG. 5 is a cross-sectional view of the protrusion 25 of the movable blade 20 of the perforated paper cutter according to the second embodiment of the present invention. Since the back surface of the gradient 26 is also chamfered 27, the sharp protrusion according to the first embodiment is used. The tip of 15 is pointed like a knife edge, whereas the tip of the protrusion 25 is pointed like a needle, so that punching of a sheet material (not shown) can be performed more easily. .

  FIG. 6 is a cross-sectional view of the protrusion 35 of the movable blade 30 of the perforated paper cutter according to the third embodiment of the present invention. The gradient 36 for avoiding the interference between the blade edges is the notch and protrusion of the movable blade 30. 35 is provided on the side of the fixed blade 31 at a position corresponding to 35, and it is possible to smoothly guide the subsequent meshing while avoiding mutual interference between the blade edges.

  The gradients shown in Examples 1 to 3 can be used in combination.

  FIG. 7 shows a perforated paper cutter according to a fourth embodiment of the present invention. The movable blade 40 has a guillotine-type obliquely inclined blade tip, and is fixed to the blade tip on the rear side in the cutting direction of the notch 44 of the movable blade. There is a sharp protrusion 45 protruding toward the blade 41 side.

  In the perforated paper cutter of Example 4 configured as described above, since the straight blade edges of both the movable blade 40 and the fixed blade 41 are arranged to be inclined in both the cutting direction and the press-contact direction, a simpler structure can be achieved. .

  In any of Examples 1 to 4, since the movable blade enters the sheet material without cutting the sheet material at the cutout portion, the movable blade is 1.5 mm or less so as not to break the sheet material at this point. It is desirable that the thickness be

It is a perspective view which shows Example 1 of this invention. It is a partial expansion perspective view of the notch part of FIG. It is a front view which shows Example 1 of this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is an expanded sectional view of the projection part which shows Example 2 of this invention. It is an expanded sectional view of the projection part which shows Example 3 of this invention. It is a perspective view which shows Example 4 of this invention. It is a front view which shows the conventional paper cutter. It is CC sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG.

Explanation of symbols

10, 20, 30, 40, 50 Movable blade 11, 21, 31, 41, 51 Fixed blade 14, 24, 34, 44, 54 Notch 15, 25, 35, 45 Sharp protrusion 16, 26, 36, Gradient

Claims (1)

  In a paper cutter that shears a sheet material with a pair of blades of a movable blade and a fixed blade, a movable blade having a thickness of 1.5 mm or less is cut at an intermediate portion thereof to form a partial uncut (perforation). A sharp protrusion that protrudes toward the fixed blade is provided at the cutting end side of the notch, the tip and the fixed blade at a position corresponding to the tip or the tip of the fixed blade. Perforated paper cutter with a structure that provides a gradient that avoids interference and induces the engagement of the blade edges.

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