JPH0737840Y2 - Perforated paper cutter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a paper cutter used in a copying machine, a facsimile machine or the like, which cuts a roll paper to a predetermined length while rewinding the roll paper over the entire width thereof. The present invention relates to a perforated paper cutter that is perforated by intermittently cutting it without performing continuous cutting.

[Conventional technology]

As a conventional perforated paper cutter of this type, the paper cutter disclosed by Japanese Utility Model Laid-Open No. Sho 62-148199 is known. That is, these conventional techniques are the fourth
Rotating blade 7 with both ends rotatably supported as shown in the figure
And a fixed blade 6 provided so that the blade edge is pressed against the rotary blade 7 by a spring (not shown), the blade edge of the fixed blade 6 or the rotary blade 7 is intermittently cut off. According to the method, perforations are processed on roll paper.

Reference numeral 8 is a guide ring, reference numeral 9 is a rotation support shaft, and reference numeral 10 is paper.

Further, a fixed blade having concave portions formed at predetermined intervals and a roller rolling on the fixed blade causes an uncut portion to be left on the photographic paper to give perforations to the photographic paper. The one disclosed in FIG. 10 of Japanese Patent No. 70170 is known as a prior art.

[Problems to be solved by the device]

However, in the conventional paper cutter disclosed by Japanese Utility Model Publication No. 62-148199, in order to obtain a good perforation, the rake angle of the cutting edge of the cutting tool in which the cutting edge is intermittently cut off, and the blade It requires a high degree of specialized skill to obtain appropriate conditions for the width of the cusps.

Further, since the blade edge of the rotary blade is provided to be inclined with respect to the rotary shaft center of the rotary blade, processing for intermittently cutting off the blade edge of the rotary blade requires a high level of technology, which causes a high cost. It was. In particular, the tendency was remarkable in the rotary blade when cutting a roll paper having a wide width.

Further, the configuration of the perforation providing means disclosed by FIG. 10 of JP-A-62-70170 is such that a roller of a predetermined width is pressed from above against the tip of the fixed blade in which recesses are engraved at predetermined intervals. The roller rolls so that the knives are sandwiched between the fixed blade and the roller to leave uncut paper on the photographic paper to give perforations. The surface had to be in contact with the tip of the cutting edge of the fixed blade, which required high-precision parts management and high assembly accuracy between the fixed blade and the roller, which was a cause of high cost. . Further, since the blade edge of the fixed blade and the outer peripheral surface of the roller are always in contact with each other, the blade edge of the fixed blade is worn quickly, resulting in a gap between the blade edge of the fixed blade and the roller, which should be cut early. There was a problem that even parts could not be cut. In particular, it is used in facsimile machines, etc., as compared with the case where perforations are given to a photographic paper that has a certain thickness and is rich in breakability (breakability), such as the photographic paper targeted by JP-A-62-70170. When processing perforations on a thin roll of paper or the like, the above-mentioned problems are conspicuous. In order to solve these problems, it is possible to provide biasing means on the roller side so that the outer peripheral surface of the roller is always pressed against the blade edge of the fixed blade.
Since the blade tip is provided with a large number of concave portions, a problem occurs that an impact is generated at the stepped portion, and it is not possible to employ a biasing means.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a perforated paper cutter capable of obtaining good perforations with a simple configuration.

[Means for Solving the Problems]

In order to achieve the above object, the present invention moves a tool rest in which a round blade is rotatably supported along a straight tool post guide, and the side surface of the tip of the round blade is moved to the tool rest. Roll paper placed in parallel with the guide and press-contacted to the blade tip side surface of the fixed blade whose blade edge side surface is intermittently cut off, and which is placed between the round blade and the fixed blade while rotating the round blade. In a perforated paper cutter for perforating
Among the both end portions of each cutout portion of the fixed blade, the relief angle at least at the end portion on the cutting movement direction side of the round blade is an acute angle.

[Action]

According to the above configuration, since the pressure contact with the round blade side surface is released in the notch portion of the blade tip side surface of the fixed blade, the cutting of the roll paper is not performed, and the pressure contact of the round blade other than the notch portion is performed. The roll paper is cut by the movement, and the roll paper is easily perforated.

Further, since the clearance angle at least at the end on the cutting movement direction side of the round blade is an acute angle among the both ends of each cutout portion of the fixed blade, the blade tip side surface of the round blade moving in the cutting direction is the fixed blade. When attempting to start pressure contact with the side surface of the next cutting edge after passing through the cut portion, the tip of the round blade does not hit the bank on the cutting blade moving direction side of the cut portion, so the blade tip side of the fixed blade The pressure contact between the blade and the side surface of the edge of the round blade is started smoothly, and the roll paper is well perforated.

〔Example〕

Next, an embodiment of a perforated paper cutter according to the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of the present invention.

In FIG. 1, a tool rest 3 in which a round blade 1 is rotatably supported
Is guided linearly by a tool post guide 4, and the linear fixed blade 2 is provided in parallel to the tool post guide 4. The round blade 1 is pivotally supported so that its side surface is in contact with the blade edge line of the fixed blade 2 with a slight inclination, and the blade edge side surface of the round blade 1 is closer to the cutting movement direction side than the center of the round blade 1. The lower cutting point A is pressed against the blade tip side surface of the fixed blade 2, and cutting is performed between the cutting section A point and the blade tip side surface of the fixed blade 2.

In the drawings, the arrow indicates the cutting movement direction.

On the other hand, on the side surface of the blade edge of the fixed blade 2, cutout portions 5 are intermittently provided at appropriate intervals. Therefore, when the cutting point A of the round blade 1 passes through the cutout portion 5 of the fixed blade 2 as the round blade 1 moves, the pressure contact state between the side surface of the round blade 1 and the side surface of the fixed blade 2 is released. The roll paper is not cut in the cutout portion 5, and no cut is made in that portion. Also,
Since the cutout portions 5 are intermittently provided at appropriate intervals as described above, a perforation can be obtained that follows the pitch (pitch) of the cutout portions 5 and the width dimension of the cutout portions 5. Second
The figure is an enlarged plan view showing an embodiment of the cut-out portion 5, and shows the cut-out portion 5 on both ends B and B'of the cut-out portion 5 on the side of the end B on the cutting movement direction side of the round blade 1. The relief angle α is 1 round blade
An acute angle is formed in order to avoid an impact at the time of re-pressure contact between the side surface of the blade and the side surface of the fixed blade 2.

FIG. 3 is a cross-sectional view of the cutout portion 5 taken along the line EE, (a) is an example in which the fixed blade 2 is cut into a rack shape over the entire thickness, and (b) is a fixed blade. 2 shows an example in which the upper part of 2 is cut off obliquely.

It should be noted that the shape, the number, and the intervals of the cutout portions 5 are not limited to those shown in the drawings, and include all those that do not depart from the spirit of the present invention.

[Effect of device]

According to the above invention, in a paper cutter including a round blade and a straight fixed blade, a good perforation can be processed on roll paper by a simple configuration in which a large number of cutout portions are provided on the side surface of the fixed blade. As it is possible, it is possible to use advanced technology to remove the cutting edge like the conventional perforated paper cutter, or to set complicated conditions for setting the rake angle of the cutting edge and the size of the cutting edge width. Technology and advanced assembly technology for rolling the outer peripheral surface of the roller into contact with the tip of the cutting edge of the fixed blade over the entire length of a straight fixed blade with concave portions formed at predetermined intervals in the blade edge. An economically excellent perforated paper cutter can be obtained without the need for.

Further, since it becomes easy to manufacture a perforated paper cutter for a roll paper having a wide paper width, its effect is great.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment according to the present invention, FIG. 2 is an enlarged plan view showing an embodiment of a cutout portion, and FIG. 3 (a).
(B) is a cross-sectional view taken along the line EE in FIG. 2, showing an embodiment of a cutout portion, and FIG. 4 is a perspective view of a conventional example. 1: Round blade, 2: Fixed blade 3: Turret, 4: Turret guide 5: Notched part, 6: Fixed blade 7: Rotating blade, 8: Spring

Claims (1)

[Scope of utility model registration request] 1. A turret in which a round blade is rotatably supported is moved along a linear turret guide, and a side surface of the tip of the round blade is provided in parallel with the turret guide. A perforating process is performed on a roll paper or the like placed between the round blade and the fixed blade while pressingly contacting the side surface of the fixed blade, the side surface of which is intermittently cut off, and rotating the round blade. In the perforated paper cutter, at least the end of the fixed blade at the end on the cutting movement direction side of the fixed blade has an acute relief angle, and the perforated paper is characterized in that cutter.