JPH0853259A - Sheet material cutting device - Google Patents

Abstract

PURPOSE:To apply proper tension and stably perform a cutting process even with a small device not using paper sheet delivery roller. CONSTITUTION:Regarding a sheet material cutting device to cut a sheet material via the rotation and travel of a rotary blade 2 supported on a carriage 3 along a stationary blade 1 laid across a sheet material, a paper sheet presser 7 is provided in parallel to the blade 2. According to this construction, a paper sheet after cut is pushed down and suitable tension is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting a long sheet material such as a roll paper or a folding continuous paper used in an image forming apparatus such as a facsimile, a printer, a copying machine, etc. The present invention relates to a sheet material cutting device that cuts a sheet material by moving a rotary blade instructed by a carriage along a fixed blade provided.

[0002]

2. Description of the Related Art Conventionally, in an apparatus using a sheet material cutting apparatus, a sheet discharge roller is installed immediately on the sheet discharge side of the cutting apparatus to convey a sheet to a predetermined position. With the progress of miniaturization, the number of devices that immediately eject paper after cutting without using the paper ejection roller has increased. Note that, as related devices of this type, there are, for example, JP-A-60-19651 and JP-A-2-269596. The former shows a method of applying a tension to the cutting wire to maintain sharpness in a configuration including a fixed blade, a cutting wire, a swing guide, and the like. Further, the latter shows a method of simplifying the cutting device by a fixed blade, a disk blade, a guide rail, and the like.

[0003]

In the above-mentioned prior art, the proper tension to the sheet material cannot be obtained, which was obtained by holding the leading edge of the sheet on the sheet discharging roller portion.
A cutting failure began to occur. Further, no sufficient consideration was given to the tension on the sheet material. An object of the present invention is to provide a sheet material cutting device that solves such problems and that can apply a proper tension to a sheet even in a small device that does not use a discharge roller and can release the tension when necessary. To do. Further, it is an object of the present invention to prevent the generation of tension from causing a jam, a load for passing the sheet material through, or a damage on the surface of the sheet material to generate paper dust.

[0004]

In order to achieve the above object, the sheet material cutting device of the present invention is provided with a rotary blade (2 in FIG. 1).
It is characterized in that a paper retainer (7 in FIG. 1) is provided on the carriage (3 in FIG. 1) that supports the sheet and is arranged in parallel with the rotary blade. In addition, the height (lower height) of the paper retainer should be the same as or higher than the lower portion of the rotary blade (for example, 0 to 1.0 mm), and the rotary blade and the paper retainer should overlap with each other at a predetermined interval (for example, 0.3-10.0 mm
The feature is that it is configured with a gap. Also, make sure that the lower shape of the paper retainer has an obtuse angle (for example, 90-
It is characterized by being configured to 150 degrees. In addition, a groove (7a in FIG. 5) for breaking is provided on the paper retainer, and
The feature is that the paper holder and the carriage are integrated.

[0005]

In the present invention, since the paper retainer installed parallel to the fixed blade pushes the cut sheet downward and gives an appropriate tension, it is possible to perform stable cutting without using the paper discharge roller. it can. Further, the shape of the paper retainer is set to be inside the outer diameter of the rotary blade, and an appropriate gap (for example, 0.3 to 10.0 mm) is provided between the rotary blade and the paper retainer to give an appropriate tension. Along with it, you can prevent jams. Further, the shape of the lower surface of the paper retainer has an obtuse angle (for example, 90 to 150 degrees) and the lower height is the same as or slightly higher than the lower surface of the rotary blade (for example, 0 to 1.0 mm), so that the load on the sheet is increased. Can be reduced. Further, when the thermal paper is used, if the paper presser is broken off from the groove portion, the paper presser can prevent the generation of paper dust without damaging the sheet.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, in a sheet material cutting device that does not use a discharge roller in a facsimile machine, a paper pressing member 7 is added in parallel to the fixed blade 1 to a carriage 3 that supports the fixed blade 1 in order to apply an appropriate tension to the sheet. To do. As shown in FIG. 1, the paper presser 7 is set to 0 with respect to the rotary blade 2.
It will be installed up to 1.0 mm higher. In this embodiment, the carriage 3 holding the rotary blade 2 is provided with the paper retainer 7, but the carriage 3 may be molded in the same manner or may be a separate component. Further, they are arranged so as to have a space of 0.3 to 10.0 mm with respect to the rotary blade 2 in the paper discharge direction. With this size, jamming can be prevented and the sheet can be appropriately tensioned. further,
As shown in FIG. 3, the rotary blade 2 has a shape that does not extend to the cutting direction side of the outer shape. This is because if the sheet comes into contact before the rotary blade 2, a jam may occur. Further, the shape of the lower surface of the paper retainer 7 is an obtuse angle (90 to 150 degrees) so as not to load the cutting as much as possible. With such a configuration, as shown in FIG.
Since the paper retainer 7 pushes the sheet downward after the sheet is cut and gives an appropriate tension, stable cutting is possible. When the paper retainer 7 is not provided, as shown in (b), the sheet is not given an appropriate tension, so that the sheet is corrugated at the rotary blade 2 and stable cutting cannot be performed.

However, when the sheet to be cut is a thermal paper, there is a heat-sensitive agent layer on the surface, and there is a risk that the sheet presser 7 will be scratched or paper dust will be generated. Therefore,
As shown in FIG. 5, the sheet presser 7 of the above embodiment is provided with a folding groove 7a so that only the sheet presser 7 can be folded and removed as necessary.

[0008]

According to the present invention, at the time of cutting a sheet, the paper presser presses the sheet and gives an appropriate tension to the sheet, so that the cutting performance is improved. Further, by preventing the shape of the paper retainer from protruding to the cutting direction side from the outer shape of the rotary blade, the cutting performance can be improved and the occurrence of jam can be suppressed. In addition, 90
By setting an angle of up to 150 degrees, the load at the time of cutting by the paper pressing is reduced and the cutting performance is improved. Also,
When the sheet material is thermal paper, the paper retainer can be folded to prevent the paper surface from being damaged and paper dust to be generated.

[Brief description of drawings]

FIG. 1 is a diagram showing a paper retainer according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an outline of a sheet material cutting device according to a first embodiment of the present invention.

FIG. 3 is a perspective view showing the shape of the paper retainer according to the first embodiment of the present invention.

FIG. 4 is a diagram showing application of tension to the paper presser according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a paper retainer according to a second embodiment of the present invention.

[Explanation of symbols]

1: Fixed blade, 2: Rotating blade, 3: Carriage, 5: Carriage transport wire, 6: Guide, 7: Paper holder, 7a:
Fold groove.

Claims (4)

[Claims] 1. A sheet material cutting device for cutting a sheet material by rotating a rotary blade supported by a carriage along a fixed blade provided across the sheet material to support the carriage. The sheet material cutting device is provided with a paper retainer arranged on a surface parallel to the rotary blade. 2. The lower portion of the paper retainer is at the same height as or higher than the height of the lower portion of the rotary blade, and a predetermined gap is provided between the rotary blade and the paper retainer. 1. The sheet material cutting device according to 1. 3. The sheet material cutting device according to claim 1, wherein the lower portion of the paper retainer has an obtuse angle. 4. The sheet material cutting device according to claim 1, wherein the paper retainer has a groove portion for breaking off, and the paper retainer and the carriage are integrated.