JPS6016921Y2 - Copy machine safety device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a safety device for a copying machine.

As shown in FIG.
If L7 or pre-transfer corotron PTC7' does not operate normally, paper separation errors are likely to occur.

Also, if the pig corotron does not operate properly, a separation error will occur.

Furthermore, there is an experimental fact that separation errors are likely to occur when development is not performed due to a malfunction in the developing device 15.

If a separation error occurs, the cleaner mechanism such as the blade may be damaged or the photosensitive drum may be scratched.

The present invention was developed in consideration of the above-mentioned problems, and in order to prevent troubles caused by the above-mentioned separation mistakes, in a copying machine, PTL or PTC, buttsuku corotron, developing machine, etc., transfer and transfer paper peeling. Furthermore, when an abnormality occurs in at least one of the devices related to development, or in the case of only one device, that device is detected, and a normal activation signal is output. If the machine is not operating, the paper feed is stopped.Moreover, in high-speed machines, the inertia is large, so it is impossible to stop the machine instantly, so when a mistake detection signal is issued, the separation claw is also operated at the same time to remove the paper. An object of the present invention is to provide a safety device for a copying machine that can prevent the intrusion of foreign substances into a cleaner section.

For example, in the case of PTL, a state in which the lamp is not operating even though the operating signal is being output normally means that the lamp is not lighting properly due to a broken cord, poor contact with the socket, etc., or due to the lamp's lifespan or toner, etc. This is due to a decrease in light intensity due to dirt, etc., and in the case of PTC and Butatsuku Corotron, EHT
There are malfunctions of the corotron, malfunction of the corotron due to breakage of the corotron cable, breakage of the corotron wire, etc., and malfunction of the electromagnetic clutch of the developing machine, malfunction of the mag roll due to breakage of the drive chain, etc.

In Fig. 1, 1 is an expander lamp, and 2 to 5 are
is a mirror 6 is a charge corotron, 10 is a vacuum transport, 11 is a separation claw, 12 is a pre-clean corotron, 13 is a cleaner housing, 14 is a photosensitive drum, 16 is a fuser, 17 is a feed roll, and 18 is a paper tray .

The configuration will be explained below based on the embodiment shown in FIG.

Figure 2 shows the defect detection means of PTL7, and 19 is PTL7.
A photosensor 20 is an amplifier for sensing the light of TL7.

FIG. 3 shows defect detection means for the mag roll 21 of the developing machine 15, in which 22 is a motion sensor and 23 is a photosensor that detects the movement of this motion sensor 22.

FIG. 4 shows a defect detection means for a corotron such as a PTC 7' or a buttock corotron 9, in which a through-type current transformer 25 is used in the high voltage cable 24.

26 is an amplifier.

However, when the PTL 7 falls below a certain light intensity level, a relay etc. is activated, a photosensor signal 28 is sent to the PTL detection circuit 27, and a PTL activation signal 29 is output. A jam circuit 30 including a paper feed stop circuit and a separation claw operation stop circuit is connected to the PTL detection circuit 27.
A signal is sent to

In the case of a corotron such as PTC 7' or Butatsukkorotron 9, the relay is activated when the corotron is discharging normally, and the signal 31 at this time is activated when the relay does not operate due to an abnormality in discharging. The jam circuit 3 is sent to the corotron detection circuit 32 and the corotron activation signal 38 is output.
A signal is sent to 0.

Note that the detection means at this time may be configured to detect the shield current without using a current transformer.

In the case of a developing machine, the mag roll 21 is detected by the photo sensor 23.
Detects the presence or absence of rotation and sends a signal 35 to the developing machine detection circuit 34.
is sent to the jam circuit 30 if the mag roll 21 is stopped despite the developing machine operation signal 37 being output.

At this time, a reed switch or the like may be used instead of the motion sensor.

The jam circuit 3 detects an abnormality in any one or two or three of the above detection circuits 27, 32, and 34 at the same time.
When the signal is sent to 0, this jam circuit 30 is activated to stop paper feeding, and the separation claw 11 is activated to separate the transfer paper that has been moving along the drum 14 and enter the cleaner section. is prevented.

In addition, it is also possible to detect an abnormality in an optical system such as an exposure lamp by the same means as in the above embodiment, and then drive the separating claw 11 and stop paper feeding.

That is, if there is an abnormality in the devices existing in the section from development to transfer, separation errors often occur. By preventing the paper from wrapping around the photosensitive drum 14, damage to the photosensitive drum 14 is almost eliminated.

In the above embodiment, an example was shown in which there are a plurality of devices related to development, transfer, and transfer paper peeling. In this case, the jam circuit 30 is activated when an abnormality occurs in this device.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of an electrophotographic copying machine to which the present invention is applied, Fig. 2 is an explanatory diagram of the configuration of an embodiment of defect detection means for Yen L, and Fig. 3 is an explanatory diagram of the configuration of an embodiment of defect detection means for a developing machine. FIG. 4 is an explanatory diagram showing an embodiment of a defect detection means for a corotron, and FIG. 5 is a block diagram. 7 is a full transfer lamp, 7' is a pretransfer corotron, 9 is a pork corotron, 21 is a maglor, and 30 is a jam circuit.

Claims (1)

[Scope of utility model registration request] In order from the upstream side in the rotational direction of the photosensitive drum 14, the developing device 15
, pre-transfer lamp or corotron 7.7'
, transfer corotron 8, pig corotron 9,
The cleaners 13 are disposed to face the photosensitive drums 14, and the paper is passed between the photosensitive drums 14, a transfer corotron 8, and a transfer corotron 9, so that a toner image is developed on the surface of the photosensitive drums 14. In a copying machine that transfers the image onto a sheet of paper and peels off the transferred sheet from the photosensitive drum 14,
A separating claw 11 is inserted between the photosensitive drum 14 and the cleaner 13.
The driving part of the separating claw 11 is connected to the jam circuit 30, and the separating claw 11 is connected to the jam circuit 30, and is also connected to the pre-transfer lamp, or the corotron 7, 7', the butatuku corotron 9, or the magnetic roll of the developing machine. 21st grade development,
Each of the devices related to transfer and paper peeling is provided with a defect detection means, and the output side of this defect detection means is connected to the jam circuit 30.
A safety device for a copying machine, characterized in that it is connected to.