JPS58111076A - Opposite-polarity toner removing method of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent a copy from being stained owing to the sticking of opposite-polarity toner to the non-image part of a photoreceptor by removing the opposite-polarity toner from a developer by use of equipment installed in an electrophotographic copying machine. CONSTITUTION:In normal copy mode, a charging corotron 2, exposing machine 3, developing machine 4, transferring machine 5, discharging corotron 6, cleaning machine 7, etc., operate under control based upon a copying process. In non-copy mode, e.g. warm-up operation, a photoreceptor 1 is raced and the discharging corotron 6 is turned on to charge the photoreceptor surface to the opposite polarity to the charging corotron 2. At this time, none of form feeding, the charging corotron 2, a discharging lamp 8, and the transfer corotron 5 operate and image exposure is not carried out, but the developing machine 4 and cleaning machine 7 are driven. At this time, opposite-polarity toner in a developer sticks to the surface of the photoreceptor 1 charged by the discharging corotron 6 and is removed by the blade 7a of the cleaning machine 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing toner of opposite polarity from a developer in an electrophotographic copying machine.

Conventionally, toner charged to the opposite polarity (hereinafter referred to as "reverse polarity toner") increases due to deterioration of the 31* agent and toner paste complaints in the developer of 1 itt yen of dust image of an electrophotographic copying machine, and this reverse polarity toner At the time of printing, the toner adheres to the non-iI + non-image portion of the photoreceptor, and the non-image gRs of the copy becomes smudged and fogged, resulting in an unsightly copy.

The present invention has been developed in view of the above circumstances, and its purpose is to provide an electrophotographic copying machine capable of removing toner of opposite polarity from a developer using a device installed in the electrophotographic copying machine. It is an object of the present invention to provide a reverse polarity toner removal method.

Embodiments of the present invention will be explained below with reference to the drawings.

Figure 1 is a schematic explanatory diagram of an electrophotographic copying machine. Around the photoreceptor, there is a charging machine (charging corotron) 2, an exposure machine 3, a developing machine 4, a transfer machine (transfer coatron) 5, and a static eliminator. (Static Eliminator Corotron) 6, Sei 111 machine 7, Static Eliminator (Static Eliminator Lamp) g
etc., and the paper is conveyed through the paper path 9.

The static eliminator corotron 6 becomes the e-polar power source 12! As for the secondary control, the charging corotron 2 is connected to the polarity power supply 13, and the developing row 14 of the converter 4 is connected to the polarity power supply 15.

During normal copying, the operation of each device is controlled based on the copying process, and as shown in FIG. A charge image A is formed, and a positive polarity toner (θ toner) is attached by the developing roll 14 of the IJ4GlI machine 4 to become toner C, which is transferred to the paper by the transfer machine 5.

Then, after the toner image 11 is transferred by the charge-eliminating corotron 6, the charge is removed from the surface of the photoreceptor t, thereby making it easier for the remaining toner opening to separate from the surface of the photoreceptor.

Then, this residual toner hole is removed by the route 7m of the cleaner 7.

On the other hand, at the time of non-copying, for example during warm-up, the photoconductor 1 is rotated idly at the same time as the main power switch of the copying machine is turned on, and the static eliminating corotron 6 is turned on to charge the surface of the photoconductor with the opposite polarity to that of the corotron 2, that is, O & sexually charged.

At this time, paper feed, charging corotron 2, static elimination rung 8,
Although the transferred corotron 5 does not operate and does not perform exposure, it is driven in the same way as in the case of the current gII machine 4 and cleaning machine 7#i combined force.

For this purpose, as shown in FIG.
Toner of opposite polarity (2 toner) in the developer is adhered and developed on the surface of the photoreceptor charged with polarity by the developing roll 14, and is removed by cleaning with a grade 7m cleaning machine 7.

In addition, as shown in FIG. 4, the charging corotron 2 and the static eliminating corotron 6 are connected to the
3t, 122, and e polarity power supply 13R112s so that it can be connected and controlled, and at the same time as the main power switch is turned on during warm-up, switch 20. When connected to 122 and 4
Then, the photoconductor sound is idled, and the developing device 4 and cleaning device 7 are operated without operating the static elimination lamp 8 and transfer corotron 5.

As a result, the surface of the photoreceptor is charged with O polarity (that is, the opposite polarity to double zero) K, and this charge is developed with opposite polarity toner 2 by the developing roll +4, and the opposite polarity toner image H is transferred to the charge eliminating corotron 6. Engineering is 0′! The photoreceptor is charged with a K charge (polarity opposite to the polarity of the photoreceptor) and is easily separated from the surface of the photoreceptor, and is cleaned by the blade 7 of the cleaner 7.

As described above, the present invention can remove toner of opposite polarity from the developer using a device installed in an electronic three-photocopying machine.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall explanatory diagram, FIGS. 2 and 3 are illustrations of operation #iL, FIG. 4 is an overall explanatory diagram showing another embodiment, and FIG. It is an explanatory diagram of the operation. 1#i sensitive element, 2 is a charging machine, 3 is an exposure machine, 4 is a developing machine,
5 is a transfer machine, 6 is a static eliminator, and 7 is a cleaning machine. Flute 1 Figure 2 Figure 3 ( (

Claims (1)

[Claims] In an electrophotographic copying machine in which a charging machine 2, an exposure machine 3, a developing machine 4, a transfer machine, a static eliminator 6, and a cleaning machine 7t are arranged around the photoconductor 1, the photoconductor surface II is The surface of the photoconductor is charged with the opposite polarity to that during copying using the charging device 2.6, and the charged charge is transferred to 3J1m by the opposite polarity toner in the developer.
A method for removing toner of opposite polarity in an electronic machine, characterized in that the toner of opposite polarity gII is removed and cleaned by a cleaner 7.