JPS6033271B2 - Abnormal condition detection device such as recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormal state detection device for a recording device, etc., which detects an abnormal state such as a paper jam in an electrostatic recording device using an optical fiber tube.

Recently, various electrostatic recording devices (so-called electronic printers) using, for example, optical fiber tubes have been developed and put into practical use.

In this type of electrostatic recording device, in order to prevent timing errors and misalignment of the recording position caused by poor conveyance of the paper, or so-called paper jams, a timer or the like is generally installed to prevent recording within a set time. If the recording paper is not conveyed or ejected, it is assumed to be an abnormal condition and the recording operation is stopped. However, if the recording operation is immediately stopped due to an abnormal condition, the recording paper will be left behind in the device, and the recording paper will have to be ejected manually, and the recorded contents will be wasted and will not be used again in the next operation. Otherwise, it may cause a fire or a new paper jam.

In addition, if the recording operation is to be stopped after the recording paper remaining in the device is ejected, a separate timer or detection means and complicated control means are required, which makes the process extremely complicated and costly. There are drawbacks. The present invention has been made in view of the above circumstances, and its purpose is to easily and reliably detect an abnormal state without using complicated means, and to make it possible to easily and reliably detect an abnormal state without using any complicated means. It is an object of the present invention to provide an abnormal state detection device such as a recording device that can be ejected without leaving any residue and can easily protect the recorded contents before the abnormal state occurs. Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows, for example, an electrostatic recording device (so-called electronic printer) according to the present invention, in which an optical fiber tube (hereinafter simply referred to as OFT) 1 is provided opposite to a photosensitive drum 2. There is.

The ○FTI operates according to a recording information signal supplied from a recording control section (not shown), and projects light onto the surface of the photosensitive drum 2 to form a static exposure latent image on the photosensitive drum 2 according to the recording information signal. It is designed to be formed on the surface of 2. The photosensitive drum 2 rotates in the direction of the arrow shown in the figure, and the surface is first charged by the charger 3, and then a static exposure latent image is formed by the OFT 1. This static latent image is visualized by applying a developer by the developing device 4, and recorded information corresponding to the recorded information signal appears as a visible image on the surface of the photosensitive drum 2. The developer on this visible image, that is, the electrostatic latent image, is applied to the paper, that is, the transfer paper (
(not shown) is attracted to the transfer paper by the electrical charge,
This causes the visible image to be transferred to the transfer paper. After the transfer, the photosensitive drum 2 is reversely charged by a charger 6 to remove residual charges. The residual developer on the surface of the photosensitive drum 2 is removed by a cleaner 7. On the other hand, transfer paper (recording paper) is supplied one by one from the supply section 8 in synchronization with the rotation of the photosensitive drum 2.

That is, the supply section 8 is constituted by a cassette 9 that stores a large number of transfer papers, and a paper feed roller 0 that takes out the transfer papers one by one from the cassette 9. The transfer paper taken out by the paper feed roller 10 is transferred to a conveyance path 11.
It is conveyed to the charger 5 by this conveyance path 11, where it comes into close contact with the surface of the photosensitive drum 2, so that the visible image formed on the surface of the photosensitive drum 2 is transferred. It has become. The transfer paper after the transfer is peeled off from the surface of the photosensitive drum 2 by being given an AC charge by the peeling charger 12, and is further conveyed on the conveyance path 13. The conveyed transfer paper is carried into the fixing device 14 so that the transferred image is heated and fixed, and the transferred paper after the fixing is carried out from the fixing device 14. The transferred transfer paper is then discharged from the discharge port 15 and guided into the stacker 16. However,
A first detector 17 is provided at the female end of the conveyance path 11 .

This first detector 17 optically detects, for example, the transfer paper supplied from the supply section 8, and is composed of a light emitting element and a light receiving element. Further, a second detector 18 is provided near the discharge port 15. This second
The detector 18 is for checking the discharge of the transfer paper and checking the passage time by detecting the transfer paper that has been conveyed to the discharge port 15, and is composed of, for example, a light emitting element and a light receiving element. FIG. 2 shows the electric circuit of the present invention, and the output of the first detector 17 is
The signal is supplied to one input terminal of an AND circuit 22 via the kumbata circuit 21, and the recording command signal is supplied to the other input terminal of the AND circuit 22.

The output of the AND circuit 22 is supplied to the set input terminal of a flip-flop circuit (hereinafter simply referred to as FF circuit) 23, and the output of the first detector 17 is supplied to the reset input terminal of this FF circuit 23. Supplied. Further, the output of the AND circuit 22 is supplied to the conveyance control section 24, and the output of the first detector 17 is further supplied to the recording control section 25. Therefore, the set output of the FF circuit 23 is
The signal is supplied to one input terminal of an AND circuit 26, and the output of the pulse generator 27 is supplied to the other input terminal of the AND circuit 26. The pulse generator 27 generates clock pulses for time measurement. Above AND circuit 2
The output (pulse) of 6 is supplied to one input terminal of an adder 28, and the output of a register 29, which will be described later, is supplied to the other input terminal of this adder 28. When the adder 28 is supplied with a pulse from the AND circuit 26, the adder 28 sequentially adds a numerical value "1" to the contents of the register 29 in accordance with the pulse,
The result of the addition is set in the register 29.
The contents of the register 29 are cleared by the output of the first detector 17. The contents of the commit register 29 are also supplied to one input of a coincidence circuit 30, and the contents of a reference time storage, for example a register 31, are supplied to the other input of this coincidence circuit 30. The above-mentioned register 31 is determined by the time it takes for the transfer paper conveyed on the conveyance paths 11 and 13 to reach the discharge row 5 from the first detector 17, that is, to be more precise, from the first detector 17 to the second detector. The time corresponding to the transport distance up to 18 is defined as the reference time Ts, and the time is converted into a corresponding numerical value and stored. Further, when the content of the register 29 matches the content of the register 31, the matching circuit 30 outputs the matching signal as an abnormal signal, and transmits it to the abnormal control unit 3.
2. When the abnormality signal is supplied from the matching circuit 30, the abnormality control section 32 displays an abnormality display to notify the operator of the abnormality, and also stops the recording operation of the recording apparatus. Next, the operation in the above configuration will be explained.

For example, if a plurality of sheets are to be recorded in succession, a recording command signal is sequentially outputted at regular intervals from a recording command control section (not shown). However, now, when the first recording command signal (1" signal) is supplied to the AND circuit 22,
At this time, the first detector 17 is not detecting the transfer paper and is outputting a logic "0" signal, so the kumbata circuit 2
Since the output of 1 is a “1” signal, the AND circuit 22
is established, the FF circuit 23 is set by the output thereof, and the transport control section 24 is operated. When the conveyance control section 24 operates, the photosensitive drum 2 and paper are fed. The roller LO and the conveyance paths 11 and 13 are each driven, and one sheet of transfer paper in the cassette 9 is taken out from the paper feed roller 1. On the other hand, F
When the F circuit 23 is set, its set output opens the gate of the AND circuit 26, so that the pulse from the pulse generator 27 is supplied to the adder 28. The adder 28 is
When the pulse is supplied, a numerical value "1" is sequentially added to the contents of the register 29 in accordance with the pulse, and the addition result is set in the register 29 again. As a result, since the contents of the register 29 are initially cleared and set to "0", they are sequentially added to "1", "2", "3", and so on. The contents of this register 29 are then supplied to a matching circuit 30'. Then, the transfer paper taken out by the paper feed roller 10 is sent into the conveyance path 11, and the transfer paper is sent to the first detector 17.
When detected, the first detector 17 outputs a logic "1" signal.

As a result, the gate of the AND circuit 22 is closed and the FF circuit 23 is reset. This FF circuit 23
When is reset, the gate of the AND circuit 26 is closed, so no pulse is supplied to the adder 28,
Therefore, adder 28 stops operating. Further, when a "1" signal is output from the first detector 17, the signal is supplied to the register 29, thereby clearing the contents of the register 29 to "0". In this way, the adder 2
8 and the register 29 are for measuring the time from when the paper feed roller 10 operates and the transfer paper is fed until it is detected by the first detector 17. Further, when the first detector 17 outputs a “1” signal, the recording control unit 25 outputs the OFTI
A recording information signal is supplied to the photosensitive drum 2, and an electrostatic latent image corresponding to the signal is formed on the surface of the photosensitive drum 2. The Sunden latent image formed on the surface of the photosensitive drum 2 is developed by a developing device 4.
This results in a visible image, and this visible image is transferred onto the transfer paper conveyed at the same timing. After the transfer, the transfer paper is conveyed through the conveyance path 13 to the fixing device 14, where it is fixed, and then from the discharge port 15 to the stacker 1.
6. Continuous recording is performed by repeating such operations every time a recording command signal is supplied. In this way, during continuous recording, even though the recording command signal is supplied and the paper feed roller 10 operates, for example, the transfer paper may run out in the cassette 9, or the paper feed roller 01 may take out the transfer paper. The transfer paper may not be properly fed, or a jam may occur between the paper feed roller 10 and the first detector 17, and the transfer paper may not be properly fed, and the first detector 17 may not be able to transfer the paper properly. If paper is not detected within s before the reference time stored in the register 31, the FF circuit 23 will continue to be set, and the register 29 will not be cleared, so the contents of the register 29 will be stored in the register after a predetermined period of time. It matches the content of 31.

When this happens, the matching circuit 30 outputs an abnormality signal, and the abnormality control section 32 notifies the operator that an abnormal condition has occurred, and also stops the operation of the recording apparatus.
At this time, the memory contents of the register 31, that is, the reference time, are
Since the time is set as described above, the abnormal state occurs and the operation of the recording device is stopped after all of the recorded transfer paper that is being transported is ejected before the abnormal state as mentioned above occurs. . Therefore, when an abnormal condition occurs, the transfer paper can be ejected without leaving it in the apparatus, and the recorded content transferred before the abnormal condition can be easily protected without wasting it. The timing chart for the above operation description is shown in FIG. 3.

In addition, in the above embodiment, the case where the implementation is applied to an electrostatic recording device called a so-called electronic printer has been described, but the invention is not limited to this, and the implementation can be similarly applied to a similar device such as an electronic copying machine. Of course it is possible.

In addition, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

As described in detail above, according to the present invention, a recording device conveys a sheet of paper supplied from a supply section, applies a recorded image etc. to the sheet during the conveyance, and then discharges the sheet from an ejection port. etc., a detector is provided for detecting the paper supplied from the supply unit, and a means is provided for storing the time taken for the transported paper to reach the discharge port from the detector as a reference time, and means for measuring the time until the paper supplied from the supply section is detected by the detector, and configured to output an abnormal signal when the measured time coincides with the stored reference time. This makes it possible to easily and reliably detect abnormal conditions without using special check items, numerous detectors and timers, or complicated control means. Moreover, when an abnormal condition occurs, paper cannot be removed from the device. It is possible to provide an abnormal state detection device such as a recording device that can be ejected without leaving anything behind and can easily protect recorded contents before the abnormal state occurs without wasting them.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of an electrostatic recording device, FIG. 2 is a diagram of an electric circuit, and FIG.
The figure is a timing chart for explaining the operation. DESCRIPTION OF SYMBOLS 1... OFT, 2... Photosensitive drum, 8... Supply section, 11, 13... Transport path, 14... Fixing device, 15... Discharge port, 17... Detector, 28... Adder, 29...
Register, 30... Matching circuit, 31... Reference time storage unit. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 In a recording device, etc. that transports paper supplied from a supply unit, applies a recorded image, etc. to the paper during the transport, and then discharges the paper from a discharge port, the paper supplied from the supply unit a detector for detecting the paper, a means for storing the time taken for the conveyed paper to reach the discharge port from the detector as a reference time; 1. An abnormal state detection device such as a recording device, comprising: means for measuring the time until the time elapses; and means for outputting an abnormal signal when the measured time coincides with the stored reference time.