JPS624710B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for more accurately correcting fatigue of a photoreceptor of an electronic copying machine.

The characteristics of the photoreceptor of an electronic copying machine gradually deteriorate due to repeated exposure, charging, and neutralization, and even if the same amount of light is irradiated under the same charging conditions, the residual potential changes. As the potential of the body part increases and the number of copies increases, the background part is also developed and so-called background stains occur on the copies, and the electrostatic potential due to the charger decreases, resulting in a decrease in copy density. In order to correct such fatigue of the photoreceptor, it has been considered to correct the developing bias voltage according to the total number of copies, as shown in Japanese Patent Application Laid-open No. 32333/1982, but with this method, the fatigue of the photoreceptor is Even if the fatigue value can be corrected to some extent, it has the disadvantage that it deviates from the actual fatigue value as the number of copies increases and cannot be completely corrected.

In an electronic copying machine in which the amount of movement of the photoreceptor changes depending on the size of the copy, the charging and exposure times, which cause fatigue of the photoreceptor, vary depending on the size of the copy. By detecting the transfer paper size, detecting the document size and changing the operation time of the charging charger, changing the return position of the optical scanning system, and changing the lighting time of the illumination lamp, as a result, even if the number of copies is the same, it will not be possible to make copies. The degree of fatigue of the photoconductor varies depending on its size. The present invention focuses on this point and includes a copy size detection device, a counter that counts the number of copies for each copy size, and a coefficient related to the copy size that is set in advance, and this coefficient and the output value of the counter. a signal generating device that emits a signal proportional to the sum of the synergistic values; a control device that controls at least one of the exposure amount, the charging amount, and the developing bias voltage according to the output signal of the signal generating device; The number of remaining copies that can be used on the photoconductor is determined by the output signal.
It is equipped with a display device that displays the life status of the photoconductor, such as commands to stop using the photoconductor or to replace the photoconductor, and eliminates the drawbacks of the conventional method by making a complete correction that matches the actual degree of fatigue. This is what I did.

Next, each embodiment of the present invention shown in the accompanying drawings will be described in detail. As shown in Table 1, there are four types of copy sizes, A, B, C, and D, and the charging or exposure time or related coefficients are α, β, β, and D, respectively.
γ, δ, and the number of copies at each copy size A, B, C, D is a, b, c, d, respectively, the fatigue of the photoreceptor is calculated by the coefficients α, β, γ, δ and the number of copies a. , b, c, d, respectively, synergistic values αa, βb, γ
It is proportional to the total value αa+βb+γc+δd of c and δd. Therefore, it is sufficient to control at least one of the exposure amount, the charging amount, and the developing bias voltage using a control signal corresponding to this total value.

FIG. 1 shows an embodiment of a control signal generating device using mechanical means. That is, each copy size A, B, C,
Each time a pulse according to the number of copies a, b, c, d at D enters the solenoids A', B', C', D', the cams A'', B'', C'', D'' are activated, respectively. Rotate once. cam
The shapes of A″, B″, C″, and D″ correspond to the respective copy sizes A,
It is formed according to the coefficients α, β, γ, δ related to B, C, D, and the cam followers 1, 2, 3,
4. Regulates the swing range. Each cam follower 1,
2, 3, and 4 are connected to one-way clutches 6, 7, 8, and 9 whose one ends are attached to the rotating shaft 5, and each cam
For each rotation of A″, B″, C″, D″, the coefficients α, β,
Since the rotating shaft 5 is rotated by an angle commensurate with γ and δ, the rotating shaft 5 has the sum value αa+β in Table 1 mentioned above.
It rotates in proportion to b+γc+δd. A gear 10 is attached to the end of the rotating shaft 5, and a large gear 1
A contactor 12 is attached to the gear 11 and is in contact with the resistor R, so that a control signal proportional to the total value αa+βb+γc+δd can be obtained between the output terminals 14 and 15. Also output terminals 14, 15
An illumination lamp 16 is inserted in between, and its illumination intensity can be varied by a control signal, which can be used to display the number of usable sheets, to display a photoconductor replacement instruction, to operate an automatic photoconductor exchange device, or as a signal to stop a machine.

FIG. 2 shows an embodiment of a control signal generating device using electrical means. Each copy size A,
Pulses according to the number of copies a, b, c, d at B, C, D are input to each input interface A, B.
.
It is multiplied by β, γ, and δα, and its output is stored in the non-luminous memory 21. The accumulated output from the non-luminous memory 21 is returned to the arithmetic circuit 20,
The signal passes through the output interface 22 and becomes a control signal or a signal indicating the life status of the photoreceptor.

According to the present invention, the copy size is detected and the fatigue of the photoconductor is corrected using a control signal proportional to the sum of the coefficients related to each copy size and the multiplicative value of the number of copies for each copy size, so that fatigue of the photoconductor is corrected with extreme accuracy. Since corrections can be made and the life status is also displayed, the lifespan can be predicted and copying will not become impossible unexpectedly. This is important in the case of the present invention, in which the life of the photoreceptor is extended by controlling the copying conditions, because the performance deteriorates rapidly just before the end of the life.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the control signal generating device of the present invention, and FIG. 2 is an electric circuit diagram of another embodiment. A′, B′, C′, D′……Solenoid, A″, B″,
C″, D″...Cam, 1, 2, 3, 4...Cam follower, 5...Rotating shaft, 6, 7, 8, 9...One-way clutch, 10, 11...Gear, 12...Contact Child, 13...Illumination lamp, 14, 15...Output terminal, R...Resistor, A, B, C, D...Interface, 20...Arithmetic circuit, 21...Non-luminescent memory, 22... ...output interface.

Claims (1)

[Claims] 1. In an electronic copying machine in which the amount of movement of the photoreceptor changes depending on the copy size, a copy size detection device, a counter that counts the number of copies for each copy size, and a counter that counts the number of copies for each copy size, and a A signal generating device which sets a coefficient in advance, obtains a synergistic value between the coefficient and the output value of the counter, and emits a signal proportional to the sum of the synergistic values for each counter; A control device that controls at least one of the exposure amount, the charging amount, and the developing bias voltage based on the output signal, and a control device that controls at least one of the exposure amount, the charging amount, and the developing bias voltage, and the output signal that controls the number of remaining copies that can be used on the photoconductor, commands to stop using the photoconductor, commands to replace the photoconductor, etc. 1. A fatigue correction device for a photoconductor of an electronic copying machine, comprising: a display device for displaying the life status of the photoconductor of an electronic copying machine.