JPS629371A - Automatic detecting device for sensitivity of photosensitive body - Google Patents

Abstract

PURPOSE:To detect automatically the sensitivity of a photosensitive body by providing a display part corresponding to the sensitivity of the photosensitive drum on a flank of a drum and also providing a sensor for detecting the display part to part of a main body facing the flank of the drum. CONSTITUTION:The display part formed of cut parts of ribs 31a-31d corresponding to the sensitivity of the photosensitive drum 1 is detected by a photosensor 4, whose detection signal is inputted to a CPU 10 through an I/O 13. This CPU decides the sensitivity of the drum 1 corresponding to the signal of the display part which is inputted from the I/O 13 and sends a signal for output control over a copying lamp to a phase control circuit 15 on the basis of the sensitivity. This circuit 15 performs gate control over a triac 17 which controls electric power supplied to the copying lamp 16 on the basis of the signal sent from the I/O 14. Consequently, the output of the copying lamp 16 in a copying process is controlled according to the sensitivity of the mounted drum 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic sensitivity detection device for a photosensitive drum used in an electrophotographic copying machine or the like.

<Prior art and its disadvantages> Generally, the sensitivity characteristics of each photoreceptor are different, so when installing the photoreceptor drum in the main body (in the case of an electrophotographic copying machine, the main body of the copying machine), The sensitivity of the actual photoconductor to be mounted is set for the actual photoreceptor. The setting method is, for example, provided with a sensitivity switch on the main body, and a person operates the sensitivity switch when the photoreceptor is attached. When the sensitivity of the photoreceptor drum is set in the main body, process control is performed based on the set sensitivity in the process of forming an image on the photoreceptor drum. The method of control is
For example, this is done by correcting the output of corona discharge or the output of a light source for exposing the document.

However, in the conventional sensitivity setting method as described above, there is a possibility that the user forgets to change the sensitivity using the switch when replacing the photoreceptor drum midway through the process, and there is also a possibility that the switch may not be accurately set to the correct position.

<Object of the Invention> An object of the present invention is to automatically detect the sensitivity of the attached photoreceptor without setting the sensitivity using a switch when attaching the photoreceptor drum, thereby eliminating the need for forgetting to set the sensitivity. It is an object of the present invention to provide an automatic detection device for the sensitivity of a photoreceptor, which can eliminate the occurrence of errors in the photoreceptor and setting position, and can contribute to cost reduction by eliminating the need for parts such as a sensitivity changeover switch.

<Structure of the Invention> The present invention provides a display portion corresponding to the sensitivity of the photoreceptor drum on the side surface of the photoreceptor drum, and a detection portion of the display portion on a part of the main body facing the side surface of the photoreceptor drum. A sensor is provided, and the sensitivity of the photoreceptor is automatically detected based on the output of the sensor.

[Effects of the Invention] By configuring as described in Section 2, the present invention eliminates the need to operate the sensitivity setting switch, which was conventionally necessary when replacing the photosensitive drum, and eliminates the need for sensitivity setting. This has the advantage of eliminating switch operation errors and forgetting switch operations, automatically setting accurate photoreceptor sensitivity, and eliminating the need for time and effort for switch operations. Further, a sensitivity changeover switch is not required, and a display section is provided on the side surface of the photoreceptor drum, and a sensor for detecting the display section is only provided in a part of the main body, which contributes to cost reduction.

<Embodiment> FIG. 1 is a diagram showing an automatic detection device for photoreceptor sensitivity and a photoreceptor drum according to an embodiment of the present invention. The photosensitive drum 1 is supported by a rotating shaft, and a flange 3 is provided on the left side surface thereof. A gear 30 for driving the photosensitive drum l in the direction of the arrow is formed on the circumferential surface of the flange 3, and a drive gear (not shown) engages with this gear 30. There are four ribs 31a to 31d between the inner surface of the flange portion 3 and the rotating shaft 2.
is provided. Further, a reflective photosensor 4 is provided in a part of the main body opposite to the left side surface of the photosensitive drum 1. As the photosensitive drum 1 rotates in the direction indicated by the arrow, the optical axis p of the light from the photosensor 4 is drawn on the surface including the ribs 31a to 31d, and the ridge mark becomes circular as indicated by β. The sensitivity of the photosensitive drum 1 is determined by the rib 3 that intersects this circle β.
It is determined by the notch state of the portions 1a to 31d.

In the example shown in the figure, a notch Kl is formed in the rib 31b. The photosensor 4 can detect that notches are formed in one of the four ribs 91 when the photosensitive drum 1, which has a number 1 formed in the notch, rotates once.

That is, in this embodiment, photosensitive drums having a maximum of four types of sensitivity can be detected.

FIG. 2 shows the correspondence between the number of rib notches detected by the photosensor 4 and the sensitivity of the photosensitive drum. In the figure, when the signal is "1000", it indicates that a notch is formed in one rib, and the drum sensitivity in that case is "1000".
1”. Also, the signal “1110”
indicates that notches are formed in three ribs, and indicates that the drum sensitivity is "3". In addition, “10
00", "0010" and "0100" are treated as the same. That is, the drum sensitivity is determined by how many "l"s there are in the four signals.

FIG. 3 is a schematic block diagram of a control section of an electrophotographic copying machine to which the photosensitive drum is mounted. cpUl(1: is R
OMI 1. RAMI 2 and l1013.14 are connected, and signals are input to l1013 from various sensors and keys. Further, a signal is output from l1014 to the phase control section 15 for controlling the motor, solenoid, clutch, and copy lamp. A display portion corresponding to the sensitivity of the photoreceptor drum formed by the cutout portions of the ribs 31a to 31d is detected by the photosensor 4, and the detection signal is 110.
13 to the CPU10. CPU10 is l1
The sensitivity of the photosensitive drum corresponding to the signal input from the display unit 013 is determined, and a signal for controlling the output of the copy lamp is sent to the phase control circuit 15 based on the sensitivity. The phase control circuit 15 performs gate control of the triac 17 that controls the power supplied to the copy lamp 16 based on the signal sent from the l1014. That is, the output of the copy lamp in the copying process is controlled according to the sensitivity of the photoreceptor drum installed. In addition, 18
is the lamp drive circuit.

FIG. 4 is a flowchart showing the general operation of the CPU10. Note that the operation in single copy mode is shown here.

First, in step n1, initialization such as clearing the work area of the RAM 12 is performed.

Next, in step n2, the drum 1 is driven one rotation. At this time, the photosensor 4 is driven and the number of reflections C is stored in the RAM1.
Store in 2. If notches are formed in all ribs, the signal obtained from the photosensor 4 will be 1111'', and the number of reflections C will be 4.In addition, if a notch is formed in one rib, , the above signal is “1000
", and the number of reflections C becomes "1". In step n3, the copy lamp output is set based on the number of reflections C stored in the RAM 12. The set value is stored in the RAM 12. Copying is possible in the following step n4. Wait for the copy switch to be pressed in step n5, and execute the copying process in step n6.If the copy lamp turns on mode while the copying process is being executed in n6, the above A signal corresponding to the copy lamp output setting value at n3 is output to the phase control circuit 15.

In this embodiment, the display part corresponding to the sensitivity of the photoreceptor drum is a notch in the rib, but it may be a label or other material, and a microsinch or the like may be used as the sensor. You can also do it.

[Brief explanation of the drawing]

FIG. 1 shows an automatic detection device and a photosensitive drum according to an embodiment of the present invention, FIG. 2 shows a correspondence relationship between the output signal of a photosensor and drum sensitivity, and FIG. 3 shows an electrophotographic copying machine. A schematic block diagram of the control section, and FIG. 4 is a flowchart showing the schematic operation of the CPU. 1-photosensitive drum, 4-photosensor, 31a to 31
d-rib, K1-notch.

Claims (1)

[Claims] (1) In a device in which the photoreceptor drum is removably attached to the main body, a display portion corresponding to the sensitivity of the photoreceptor drum is provided on the side surface of the photoreceptor drum, and a display portion corresponding to the sensitivity of the photoreceptor drum is provided on the side surface of the photoreceptor drum. 1. An automatic photoconductor sensitivity detection device, characterized in that a sensor for detecting the display section is provided in the display section, and the sensitivity of the photoconductor is detected based on the output of the sensor.