JPS59153763A - Roll paper cutter for duplicating machine - Google Patents

Abstract

PURPOSE:To reduce the number of parts by arranging a switchover mirror box in the route of laser beam for cutting roll paper between a polyhedral mirror and a correction lens for radiating a roll paper holder by the switchover thereof to detect the remaind amount. CONSTITUTION:When a laser source 22 and a motor 20 are started, the laser beam of low output is radiated toward a roll paper cutting part 18 via a rotating polyhedral mirror 21 and a correction lens 19. Since a switchover mirror 23A of a switchover mirror box 23 arranged in the route of the beam is directed to a fixed mirror 23B, the beam is radiated to the side of a roll paper holder 15, and the remaind amount of a roll paper 28 is detected by light-receiving elements 24... to be indicated. When duplication is started and the top of the roll paper 28 is detected by a paper-top detector, a control circuit switches the laser source 22 over to high output, and simultaneously the switchover mirror 23A is switched over to radiate a cutting part 18 for cutting the roll paper 28. This construction permits to reduce the number of parts, the frequency of troubles, and the space of installation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a roll paper cutting device in a roll paper machine horizontal copying machine that uses laser beam irradiation thermal energy to cut the roll paper into a predetermined length. The present invention relates to a roll paper cutting device for a copying machine or the like, characterized in that the laser beam is also used to detect the remaining amount of roll paper.

Conventionally, this type of cutting device is shown in FIGS. 1(a) and 1(b).
- a cutting section 4 is provided at an appropriate location between the feed roller 2.2 and the photoconductor 3 in the paper transport path leading to the transfer point on the photoconductor 3; A rotary polyhedral mirror 1 equipped with a correction lens 5 for correcting the optical path and a motor 6 is sequentially disposed below the polyhedral mirror T, and a laser light source 8 is disposed near the paper conveyance path for the polyhedral mirror T. By this, the laser beam output from the laser light source 8 is reflected by the polygonal mirror 7 to the cutting section 4, and at the time of reflection, the polygonal mirror T is rotated to perform high-speed scanning perpendicular to the conveying direction of the paper. The optical path of the laser beam during scanning of the cutting section 4 is corrected by a correction lens 5, and the roll paper is cut by the irradiated heat energy.

The output amount of this laser beam is controlled by connecting a laser power supply circuit 9, a control circuit 10, etc. to the laser light source 8, and the remaining amount of the roll paper 11 set in the roll paper holder 1. As a mechanism for detecting this, an arbitrary number of light-emitting elements 12 and light-receiving elements 13 are arranged relative to each other in an arbitrary number of zigzag shapes at appropriate positions at the bottom of the roll paper holder 1 over the flat diameter of the roll paper 11. By doing so, the light emitted by the light emitting elements 12 is transmitted to the light receiving elements 13 without being interrupted by the roll paper 11.
The light of the detected portion is transmitted to the light receiving element 13...
Then, the remaining amount of the roll paper 11 is sent to the remaining amount display device 14 instead of an electric signal, and the remaining amount of the roll paper 11 is displayed there.

However, such a roll paper cutting device requires a large number of parts because a mechanism for cutting the roll paper 11 and a mechanism for displaying the remaining amount of roll paper are each provided separately. The device itself has disadvantages such as being complicated and requiring a large amount of space.

The present invention has been made in order to eliminate the drawbacks of the conventional roll paper cutting device using a laser beam. A switching mirror box is arranged in the optical path of the beam so that the laser beam directed from the polyhedral mirror toward the cutting section can be switched in one direction toward the roll paper holder. An appropriate number of light-receiving elements are arranged corresponding to the thickness of the roll paper, and the light-receiving elements detect the beam that is not blocked by the roll paper among the laser beams emitted from the switching mirror box. It is an object of the present invention to provide a roll paper cutting device such as a copying machine that can display the remaining amount of roll paper by converting it into an electric signal using a light receiving element and sending it to a remaining amount display device.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a schematic diagram showing an embodiment of the roll paper cutting device of the present invention.

In the figure, the roll paper holder 15 is placed at the lower left corner.
Feed roller 16.1 placed at an appropriate location diagonally above and to the right from
6, and reaches the transfer point of the photoreceptor 17, which is placed at a suitable position on the right horizontal direction of the feed roller IL16, at a suitable position between the transfer point of the feed roller 16.16 and the photoreceptor 17. is provided with a cutting section 18 for the roll paper,
A correction lens 19 and a morph 20 are provided at the bottom of the cutting section 1B.
A polyhedral mirror 21 is arranged to be rotated by. A laser light source 22 is disposed near the paper transport path for the polygon mirror 21, and the laser beam output from the laser light source 22 is reflected by the polygon mirror 21 so that it can be irradiated onto the cutting section 18. At the same time, by rotating the polyhedral mirror 210, the cutting section 18
The paper can be scanned at high speed perpendicularly to the conveyance direction of the paper, and while the optical path of the beam during scanning is corrected by a correction lens 19, the roll paper can be cut by the irradiated thermal energy.

On the other hand, in the optical path of the laser beam from the Toki polyhedral mirror 21 to the cutting section 18, the correction lens 19 and the cutting section 1
A switchable mirror box 23 is arranged in the middle part between 8 and 8.
The laser beam irradiated from the polyhedral mirror 21 can be reflected in the direction of the roll paper holder 15. As shown in FIG. 3, the switching mirror box 23 has a switching mirror 23A rotatably provided at one end with a hinge or the like on its inside, and a laser beam reflected from the switching mirror 23A is further connected to the roll paper holder 15. The switching mirror 23A has a structure in which a fixed mirror 23B that reflects in the direction is housed, and the switching mirror 23A enters into the optical path of the laser beam from the polyhedral mirror 21 to the cutting section 18 by an interlocking mechanism (not shown). , the beam is fixed by a mirror 23
The polyhedral mirror 21 is configured so that the laser beam can be reflected to the laser beam B or vice versa, and can be moved to a position out of the optical path so that the laser beam from the polyhedral mirror 21 does not interfere with irradiation of the cutting section 18. ing.

Further, at an appropriate location on the lower part of the roll paper holder 15, that is, on the side to which the laser beam reflected from the switching mirror box 23 is irradiated, there is a light-receiving device with an appropriate intensity over approximately the radius of the roll paper, corresponding to the thickness of the roll paper. Elements 24... are arranged in diagonal rows, and the light receiving elements 24... are connected to a roll paper remaining amount display device 25, and the laser light source 22 is connected to a control circuit 26 and a laser power supply circuit 2T. By connecting the laser beam source 22, the laser beam output from the laser light source 22 can be controlled differently when cutting the roll paper and when detecting the remaining amount. In addition, a circuit from the light receiving element 24 to the remaining amount display device 25 is connected to this control circuit 26, and a stop mechanism for the laser light source 23 is provided to control the remaining amount of the roll paper set in the roll paper holder 15. If the light receiving element 24 detects that there is no laser beam, the laser beam output from the laser light source 23 may be automatically stopped based on the signal.

The present invention is constructed as described above. Next, its operation will be explained.

Assume that the roll paper 28 is now set in the roll paper holder 15. In this state, when the electrical system for the main cutting device is turned on, the laser light source 23 and motor 19
starts, and the laser light source 23 outputs a weak laser beam. In synchronization with this, the polyhedral mirror 21 also begins to rotate, and the laser beam output from the laser light source 23 is reflected in the direction of the cutting section 18 and scanned at high speed perpendicular to the paper conveyance direction. At this time, the switching mirror box 23 is located in the optical path of the laser beam and the switching mirror 23A stored inside the switching mirror box 23 is
has entered the optical path of the beam, and this is fixed by mirror 2.
It is reflected in the direction of 3B. Therefore, the laser beam is reflected by the fixed mirror 23B in the direction of the roll paper holder 1--15 without irradiating the cutting section 18, and the portion of this beam that is not blocked by the roll paper 28 is transmitted to the light receiving element 24. ... is detected, and the signal is sent to the remaining amount display device 25, where the remaining amount is displayed. When the copying operation is started, the end of the roll paper 2.8 set in the roll paper holder 15 passes between the feed rollers 16.16 and heads toward the transfer point on the photoreceptor 17. When the leading edge of the roll paper 28 is caught by a paper leading edge detection device (not shown) disposed at an appropriate position on the paper conveyance path during this process, the detection device sends the detection signal to the control circuit 26 and sends the detection signal to the control circuit 26. 26, the laser beam output from the laser light source 23 is switched via the laser power supply circuit 27 to a strong output suitable for cutting the roll paper. At the same time, a detection signal is also sent from the detection device to the interlocking mechanism of the switching mirror 23A of the switching mirror box 23 to operate the switching mirror 23A so that the laser beam can be irradiated onto the cutting section 18. Therefore, the roll paper 28 is cut by this beam at the cutting section 18, but when this cutting is completed, the output of the laser beam of the laser light source 22 is returned to the original weak output, and the switching mirror box 23 is switched. The mirror 23A also returns to its original state, and the remaining amount of the roll paper 28 can be detected again.

In the present invention, the above-described operations are repeated to cut the roll paper 2B into a length suitable for copying.

Therefore, in the present invention, a laser beam conventionally used only for cutting roll paper is reflected in the direction of the roll paper holder 15 by a switching mirror hook 23, and this reflected laser beam is sent to a light receiving element disposed at the bottom of the roll paper holder 15. The remaining amount of roll paper is detected by receiving light at 24..., and the detection signal is sent to the remaining amount display device 25 for display. This eliminates the need for the light-emitting light emitting device, which reduces the number of parts required, making it easier to manufacture and providing a cutting device that has fewer failures.It also reduces the space required for the device itself. It has the advantage that it can be done in small quantities.

[Brief explanation of the drawing]

FIG. 1(a) is a schematic configuration diagram of a conventional roll paper cutting device;
Fig. 1(b) is a perspective view of the remaining roll paper amount detection unit, Fig. 2 is a schematic configuration diagram of the roll paper cutting device of the present invention, and Fig. 3 is a perspective view of the roll paper remaining amount detection unit. Ruru in perspective view. In the figure, 15--roll paper holder, 16--feed roller, 17--photoreceptor, 18--cutting section, 21-' polyhedral mirror, 22-- Laser light source, 23...Switchable mirror box, 24・φ
--- Light receiving element, 25 --- Remaining amount display device. Figure 1 (α) Figure 2 Figure 3

Claims (1)

[Claims] A cutting section of the roll paper is provided at a suitable position in the middle of the paper conveyance path from the feed roller to the turning point of the photoreceptor, and the cutting section is
In the cutting device, the cutting device is arranged to cut the roll paper by scanning a laser beam outputted from a laser light source disposed near the paper transport path from an appropriate position on the paper transport path at high speed perpendicular to the paper transport direction. A switching mirror box is arranged at an appropriate position on the optical path of the laser beam from the laser light source to the cutting section so that the laser beam can be switched in one direction toward the roll paper holder, and a switching mirror box is placed on the side of the roll paper holder that is irradiated with the laser beam. The device arranges an appropriate number of light-receiving elements according to the thickness of the roll paper, and converts the laser beam detected by the light-receiving element out of the laser beam emitted from the multi-fertilization switching mirror box into an electrical signal without being blocked by the roll paper. A roll paper cutting device for a copying machine or the like, characterized in that the remaining amount of roll paper is displayed on a remaining amount display device.