JPS60229079A - Transfer device - Google Patents

Abstract

PURPOSE:To transfer a visible image on a photosensitive body to a transfer material, and eliminate the need for maintenance operation and improve transfer efficiency by bringing a conductive brush into contact with the transfer material which contacts the photosensitive body, and impressing a specific voltage to the conductive brush. CONSTITUTION:The conductive brush 2 is applied with a DC voltage of + or -200- + or -2,000V from a DC power source 3. The conductive brush 2 is a roller type conductive brush formed by implanting numbers of conductive contactors 5 in the peripheral surface of a cylindrical core 4 made of a conductor, and contactors 5 contact the surface of the photosensitive body 1 gently and also rotate at a peripheral speed 1-5 times as fast as that of the photosensitive body 1. Contactors 5 contact the rear surface of the transfer material 6 gently to charge the rear surface of the transfer material 5 uniformly, so the visible image on the photosensitive body 1 is transferred to the surface of the transfer material 6. Consequently, discharging need not be performed, so the generation of visible image ozone due to electrostatic attractive force, and damage and deterioration of the photosensitive body and a discharge wire are eliminated, and the need for maintenance operation is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for transferring a visible image formed on a photoreceptor of an electronic copying machine to a transfer material.

Conventional technology A corona discharger is disposed facing the photoreceptor, a transfer material is brought into close contact with the photoreceptor, and a corona discharger is used from the back of the transfer material to charge the visible image (toner) with a polarity opposite to that of the visible image (toner). There is known a transfer device that supplies electric charge and transfers the material to a visible credit transfer material by electrostatic attraction.

However, since a transfer device using a corona discharger uses a discharge phenomenon, ozone is generated and the photoreceptor and discharge wire deteriorate due to the discharge phenomenon, so it is important to keep the copying machine in good condition. To achieve this, it is necessary to make adjustments and replace parts at relatively short intervals, which makes maintenance work cumbersome.

Purpose of the Invention To make it possible to transfer a visible image on a photoreceptor to a transfer material without generating ozone or damaging the photoreceptor, eliminating the need for maintenance work, and improving transfer efficiency. With the goal.

Constituent structure of the invention A conductive brush is brought into contact with a transfer material that is in close contact with a photoreceptor, and a voltage of ±200 to ±2000 V is applied to the conductive brush so that the back surface of the transfer material is charged by contact with the conductive brush. .

Embodiment FIG. 1 is a front view of a transfer device, in which a conductive brush 2 is in light contact with the surface of a photoreceptor 1, and a DC voltage is not applied to the conductive brush 2 by a DC power source 3. be.

The conductive brush 2 has a cylindrical core 4 attached to the conductor.
A large number of conductive contacts 5 are implanted on the circumferential surface of the photoreceptor I to form a nine-roller type conductive brush. The circumferential speed of the photoreceptor 1 is 1 to 5 times the circumferential speed of the photoreceptor 1.

The contact 5 is made of, for example, nylon fiber mixed with a conductor such as carbon, and is electrically conductive.

Because of this, during transfer, the contactor 5 lightly contacts the back surface of the transfer material 6, and the back surface of the transfer material 5 is uniformly charged by contact, so that the visible image (toner) on the photoreceptor L is statically charged. The visible image is transferred to the surface of the transfer material 6 by the electric attraction force.

As described above, since the transfer can be performed by contact charging, there is no need to perform discharge as in the case of transfer using a copier discharger, so there is no need to generate ozone or damage or deteriorate the photoreceptor or discharge wire due to the discharge phenomenon. This eliminates the need for maintenance work.

Here, when different DC voltages were applied to the conductive brush 2 and the transfer efficiency was measured, the results shown in FIG. 2 were obtained.

From this, it is clear that if a DC voltage of 200 V to 2000 V is applied, the transfer efficiency will be excellent.

This is because when the applied voltage is lower than 200V, the transfer material has only a low potential, so the electrostatic attraction force between the toner and the toner is weak, and the electrostatic attraction force between the transfer material and the toner is weak and insufficient when the applied voltage is 2000V or more. Alternatively, it is thought that discharge occurs between the toners, and the amount of charge on the toner decreases, or the polarity is reversed, resulting in a decrease in transfer efficiency.

In the above embodiments, the case of a positive charging system has been described, but in the case of a negative charging system, a DC voltage of -200 to -2000V may be applied.

Further, the conductive brush may be a fixed flat conductive brush in which a large number of contacts 5 are embedded in a flat metal core 4 as shown in FIG.

Effects of the Invention The visible image on the photoreceptor I can be transferred to the transfer material 6 by charging the back side of the transfer material 6 by contact charging of the conductive brush 2, and there is no need to perform discharge as in a corona discharger. This eliminates the need for maintenance work, since the photoreceptor is not damaged or the discharge wire is not deteriorated due to the discharge phenomenon.

Since a voltage of ±200 to ±2000 V was applied to the conductive brush 2, excellent transfer efficiency could be obtained without reducing the transfer efficiency.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a front view of a transfer device, FIG. 2 is a front view showing the relationship between the voltage applied to the conductive brush and transfer efficiency, and FIG. 3 is a front view of the transfer device. It is an explanatory diagram of an example. 1 is a photoreceptor, 2 is a conductive brush. 200V IKV 2KV 4-densogram/fp-no-wa (Rainbow moon)

Claims (1)

[Claims] A conductive brush 2 is provided facing the photoconductor 1 so as to be in contact with the back surface of the transfer material 6 that is in close contact with the photoconductor 1, and a voltage of ±200 to ±2000 V is applied to the conductive brush 2. A transcription device that uses