JPS59137967A - Copying machine - Google Patents

Abstract

PURPOSE:To detect securely trouble originating from the movement of an original and copying paper and to improve reliability by comparing the detection timing of reflected light from a reflecting member provided to an original platen with the irradiation timing of light which is emitted from a copy light source and illuminates the reflecting member. CONSTITUTION:The original on the original platen 2 is irradiated with the copy light source light 3 by a signa A as a copy command and the platen 2 is moved in a specific direction by a signal B. A timer circuit 12 starts a timer at the rising of the signal A and compares the timer output with the detection timing of a photodetection signal C outputted from a photodetector 9 to supplies a sequence controller 10 with a synchronizing signal D when the detection timing of the reflected light from the reflecting plate 7 by the photodetection signal C coincides with the timer output as the irradiation timing of the reflected light source light illuminating the reflecting plate 7 or an error signal E when not. The controller 10 supplies a driving signal F to a paper feed driving device 14 by the synchronizing signal D or stops the output of the signals A, B, and F and also drives respective loads in operation to a fail-safe side when the error signal E is supplied.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a copying machine, and more particularly, to a copying machine that moves an original and a copy paper in synchronization, and images an image of a copying light source irradiated on the original onto a photoreceptor. The present invention relates to a copying machine that forms an image on copy paper that is conveyed.

[Prior art]

In conventional copying machines, the timing for synchronizing and driving the document table drive device that moves the document table and the paper feed drive device that conveys the copy paper is controlled by a microswitch operated by the document table drive device or by a proximity switch. It was determined by a switch such as a switch.

On the other hand, in a copying machine, if the copying light source has a failure such as a wire breakage, copying becomes impossible, so in conventional copying machines, a wire breakage in the copying light source is detected by detecting a current. However, it is not possible to improve the reliability of the apparatus simply by detecting a disconnection in the copying light source. That is, the reliability of the copying machine cannot be maintained unless the original and copy paper move in synchronization.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a copying machine that can reliably detect failures caused by movement of originals and copy paper and improve reliability. It is in.

[Summary of the invention]

In order to achieve the above object, the present invention moves an original and copy paper in synchronization, sequentially irradiates the original with light from a copying light source, and creates an image by light reflected from the original onto the copy paper conveyed onto a photoreceptor. In a copying machine that forms an image, a reflective member is placed on the document table at the position where the light from the copying light source is irradiated, and the reflected light reflected by the reflective member as the document table moves is detected via an optical system. Then, the detection timing of this reflected light is compared with the irradiation timing of the copying light source light irradiated to the reflecting member, and when the detection timing and the irradiation timing are different, at least the document table drive device and the paper feed drive device are set to the fail-safe side. It is characterized by being driven by.

[Embodiments of the invention]

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

1 and 2 show the configuration of a preferred embodiment of the present invention, with FIG. 1 being a front view and FIG. 2 being a side view.

1 and 2, a copying machine 1 is provided with a document table 2, and a copy sheet placed on the document table 2 is irradiated with copy light source light from a copy light source 3.

When the copying light source light is irradiated onto the copying paper, the reflected light reflected from the original document is transmitted via the copying optical system 4.

The transmitted copy light source light forms an image on the copy paper that is conveyed onto the photoreceptor 6 by driving the paper feed gate 5 that conveys the copy paper.

Also 1. As shown in FIG. 3, a reflecting plate 7 is disposed on the document table 2 at a position where the copying light source light from the copying light source 3 is irradiated. When the document table 2 moves and the copying light source light is irradiated onto the reflecting plate 7, this reflected light is transmitted through an optical system 8 such as a lens and supplied to a photodetector 9.

Here, the present invention compares the detection timing of the reflected light detected by the photodetector 9 and the irradiation timing of the copying light source light reflected by the reflection plate 7, and when the detection timing and the irradiation timing differ, , at least the document table drive device that moves the document table 2 and the paper feed drive device that conveys the copy paper are driven to the 7-ail safe side.In this embodiment, the device that performs the above control is is structured as follows.

FIG. 4 shows the configuration of a copy control apparatus according to a preferred embodiment of the present invention.

In FIG. 4, the copying control device in this embodiment is composed of a sequence control device 101, a copying light source drive circuit 11, a timer circuit 12, an original table drive device 13, and a paper feed movement circuit 14.

The sequence control device 10 performs sequence control as shown in FIG. 5 based on copy commands.

That is, first, a signal A for lighting the copying light source 3 is sent to the copying light source drive circuit 11. The signal is supplied to the timer circuit 12. In response to this signal A, the copying light source light 3 is turned on, and the original on the document table 2 is irradiated with the copying light source light. Also, at this time, the document platen drive device 1
Signal B for driving document platen drive device 1 is output.
3, the document table 2 moves in a predetermined direction.

Timer circuit 12 starts the timer on a rising edge of the signal. Then, the detection timing of the photodetection signal C output from the photodetector 9 and the timer output are compared, and the detection timing of the reflected light of the reflection plate 7 by the photodetection signal C and the reflected light source light irradiated on the reflection plate 7 are compared. When the timer output determined as the irradiation timing matches, a synchronization signal is supplied to the sequence control device 10. On the other hand, when the detection timing is different from the irradiation timing, an error signal E is supplied to the sequence control device 10.

The sequence control device 10 supplies the drive signal F to the paper feed drive device 14 based on the synchronization signal DK, and the conveyance of the copy paper is continued. On the other hand, when the error signal E is supplied to the sequence control device 10, the output of the signals A, B, and F is stopped, and each load operated by the sequence control device 10 is driven to the safe side. .

In this example, if the copying light source light 3 does not light up normally or the document table 2 does not move normally, the timer circuit 12 sends an error signal E.
is output, and the sequence control device IO drives at least the document table drive device 13 and the paper feed drive device 14 to the 7-fail safe side, so that the reliability of the copying machine can be improved.

6 and 7 show the structure of another embodiment of the present invention.

The copying machine in this embodiment uses the copying optical system 4 shown in FIG. The other configuration is the same as that shown in FIG. Omitted.

According to this embodiment, since the copying optical system 4 is also used as an optical system for transmitting the reflected light from the reflection plate 7, it is possible to reduce the cost compared to the case of the previous embodiment.

In each of the above-mentioned embodiments, it is possible to detect a failure in the copying light source light or the platen drive device without using a microswitch, a nearby switch, or a current detection circuit as in the conventional case. The number of parts can be reduced and reliability can be improved.

〔Effect of the invention〕

As explained above, according to the present invention, the detection timing of the reflected light from the reflective member provided on the document table is compared with the irradiation timing of the copying light source light irradiated to the reflective member,
When the detection timing and the irradiation timing are different, at least the document platen drive device and the paper feed drive device can be driven toward the 7x7 side, which has an excellent effect of improving the reliability of the copying machine. There is.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a copying machine showing one embodiment of the present invention, and FIG.
1 is a side view of FIG. 1, FIG. 3 is a diagram showing the configuration of the document table shown in FIG. 1, FIG. 4 is a configuration diagram of a copying control device applied to a copying machine according to the present invention, and FIG. 70-chart for explaining the operation of FIG. 4, FIG. 6 is a configuration diagram showing another embodiment of the present invention, and FIG. 7 is a side view showing the internal configuration of the apparatus shown in FIG. 6. l...copying machine, 2...original stand, death...copying light source, 4
... Copying optical system, 6... Photoreceptor, 7... Reflection plate,
8... Optical system, 9... Photodetector, 10... River sequence control device, 12... Timer circuit, 1-3... Original table drive device, 14... Paper feed drive device. $1 No Z diagram! 3 Diagram No. 1 Douzu Kaya, 5th inch

Claims (1)

[Claims] 1. A document table drive device that moves the document table and a paper feed drive device that conveys the copy paper are driven in synchronization, and copying light source light is applied onto the document as the document table moves. A copying machine that sequentially irradiates light reflected from a document through a copying optical system, and sequentially forms an image of the reflected light on copy paper that is conveyed onto a photoreceptor by the drive of a paper feed drive device. In this method, a reflecting member is disposed on the document table at a position where the copying light source light is irradiated, and the reflected light reflected by the reflecting member as the document table moves is detected via an optical system. Comparing the detection timing and the irradiation timing of the copying light source light irradiated to the reflecting member, and when the detection timing and the irradiation timing are different, driving at least the original table drive device and the paper feed drive device toward the 7 side. A copying machine featuring: 2. The copying machine according to claim 1, wherein the copying optical system is also used as an optical system for transmitting reflected light from a reflecting member.