JPH02178676A - Control method for electrophotographic recorder - Google Patents

Abstract

PURPOSE:To prevent carriers from being unnecessarily consumed and to prevent damage to a photosensitive body, which results from the sticking of carriers, by turning off the power source of an electrifier upon the completion of printing, and turning off the power source of the driving motor of a developing unit and the photosensive body after the electrified part of the photosensitive body, which is electrified by an electrifier, passes through the developing unit, which follows an elapse of a prescribed time. CONSTITUTION:The power source of the electrifier 2 is turned off upon the completion of printing; at the same time a timer T is started to count a prescribed time t1. A time t1 can be accurately calculated from central angle theta+alpha where a central angle thetabetween the electrifier 2 and the developing unit 4 is added to a central angle alphafrom the center of the electrifier 2 to its edge, a radius (r) of a photosensitive body 1, and a peripheral velocity Vc in the rotation of the photosensitive body 1, and thus, a time, ttheta+alpha can be calculated. The power source of the developing unit 4 is turned off when t1>=ttheta+alpha holds after the start of the timer T; the power source of the driving motor of the photosensitive body 1 is also turned off. Thus, preventing carriers from being consumed, which results from the sticking of carriers to an unneeded part other than a printing position; and damage to the photosensitive body because of the sticking of carriers can be eliminated.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method of controlling an electrophotographic recording device. [Prior Art] Conventionally, in electrophotographic recording devices, when printing, the entire surface of a photoreceptor is charged with a charger, and an electrostatic latent image is formed on the surface of the photoreceptor by irradiating light with an LED array, laser beam, etc. This electrostatic latent image is developed by a developing device, the developed image is transferred onto recording paper, the surface of the photoreceptor is cleaned, and finally the surface of the photoreceptor is neutralized, and this process is repeated. After printing is completed, a charger is installed to charge the photoconductor,
The developing bias applied to the developing sleeve of the developing device and the motor that drives the photoreceptor are controlled at the same time that the power is turned off. [Problem to be solved] If the charger, developer, and motor are controlled to turn off the power at the same time, after printing is completed, no developing bias is applied to the developer, and the charger This results in a situation in which the charged photoreceptor charging portion faces the developing device. For this reason, in the case of the two-component development method, a charge having a polarity opposite to the charging potential of the charged portion of the photoreceptor is induced in the conductive carrier, and the carrier adheres to the photoreceptor due to the electrical attraction force. For this reason, the carrier is consumed more than necessary, and if the carrier is gradually consumed, stable printing quality cannot be obtained. Further, since the carrier is usually particles made of iron, ferrite, etc. and having a diameter of several tens to 100 microns, there is a problem that when the carrier is scraped off by the cleaning section, it damages the photoreceptor. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate unnecessary consumption of carrier, eliminate damage to the photoreceptor due to carrier adhesion, and obtain stable printing quality. [Means for Solving the Problems] In order to achieve the above object, the method for controlling an electrophotographic recording device of the present invention includes turning off the power to the charger after printing is completed, and then charging the charger with the charger after a predetermined period of time has elapsed. After the charged photoreceptor charging section passes through the developer, the power to the developer and the photoreceptor drive motor is turned off.

[Effect]

By performing such control, the charged portion of the photoreceptor charged by the bander will not face the developer to which no developing bias is applied, and after printing is completed, the photoreceptor in the neutralized state will always be in the developing state. You will be facing the vessel. [Example] First, the electrophotographic recording device 15 shown in FIG. 2 will be briefly described. Photoreceptor 1 rotationally driven by a drive motor (not shown)
The entire surface is charged by the charger 2, and the LED is
An electrostatic latent image is formed on the surface of the photoreceptor 1 by irradiating light with an array or the like, and toner 6 is supplied to the photoreceptor 1 by the rotation of the developing sleeve 5 in the developing device 4, and the toner 6 is applied to the electrostatic latent image. The toner 6 is deposited and developed, a recording paper 8 is supplied from the paper cassette 7, and the developed toner is transferred onto the recording paper 8 between the photoreceptor 1 and the transfer charger 9. The recording paper 8 is separated from the photoreceptor 1 by a separating charger 10, guided to a fixing device 11, and sent to a paper ejection cassette 12. On the other hand, the photoconductor 1 that has passed through the transfer section is cleaned by a cleaning device 13.
The remaining toner 6 is removed, and finally the surface of the photoreceptor 1 is neutralized by a static eliminator 14. From such an electrophotographic recording cycle, when all the prints are transferred onto the recording paper 8, the surface of the photoreceptor 1 between the charger 2 and the developer 4 is already fully charged for the next print. This means that this is being done. In the present invention, as shown in the flowchart of FIG. 1, first, when a microcomputer or the like determines that printing has ended, the power to the charger 2 is first turned off. At the same time, timer T is started. A predetermined time 2 is counted by a timer T. The time ti is set to the time required for the charged portion on the photoreceptor 1 charged by the band TL device 2 to rotate to a position where it passes the developing device 4.
l is the central angle θ between the charger 2 and the developer 4 and the charging rM
It is possible to accurately calculate from the central angle θ+a, which is the sum of the central angle α from the center of 2 to the end of the charger, the radius r of the photoreceptor 1, and the circumferential speed Vc of rotation of the photoreceptor 1. , thus the time tθ+α is calculated. After timer T starts, until time 11 has elapsed by time tθ+a, timer T continues to count, but if tl≧t
When θ+α is reached, the power to the developing device 4 is turned off, and the power to the drive motor for the photoreceptor 1 is also turned off. That is, in the present invention, since the charger 2 is turned off by the printing end process, the surface of the photoreceptor 1 is not charged after that, and 11≧

[The photosensitive drum 1 is still rotating until the time θ+α has elapsed, so during this rotation the charged portion passes through the developing device 4, and the uncharged portion reaches a position facing the developing device 4. I will have to move. Therefore, even if the developing device 4 is turned off at this time and the motor is stopped, the surface of the photoreceptor 1 facing the developing device 4 is not charged, so the carrier will adhere to the surface of the photoreceptor 1 that is not the printing position. There is no such thing. [Effect] According to the control method for an electrophotographic recording device of the present invention described above, the carrier is not consumed by adhering to unnecessary parts other than the printing position, and especially in a small-sized recording device, H when printing and stopping are repeated frequently.
It is effective. Furthermore, damage to the photoreceptor due to carrier adhesion can be eliminated, and carrier consumption can be suppressed, so that stable printing quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a flow chart of the present invention, and FIG. 2 is a schematic configuration diagram of an electrophotographic recording apparatus. DESCRIPTION OF SYMBOLS 1... Photoreceptor, 2... Charger, 3... Exposure section, 4... Current (I device), 15... Electrophotographic recording device.

Claims (1)

[Scope of Claims] An electronic device that charges the entire surface of a photoreceptor with a charger, irradiates light with an exposure section to form an electrostatic latent image on the surface of the photoreceptor, and develops this electrostatic latent image with a developer. In the photographic recording apparatus, the power to the charger is turned off after printing is completed, and after a predetermined period of time has elapsed and the charging portion of the photoreceptor charged by the charger passes through the developer, the developer and the photoreceptor are turned off. A method for controlling an electrophotographic recording device, characterized by turning off a power supply to a body drive motor.