JPH03217883A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent peeling performance from lowering and to accomplish stable destaticization by providing a destaticizing member being a conductive elastic body so that it is intersected orthogonally with a feeding direction without coming in contact with a transfer sheet. CONSTITUTION:A weak potential other than an image developing part on a photosensitive body 1 is destaticized by discharging between the transfer sheet A and the destaticizing member 11 by the member 11, and the sheet A is peeled off from the photosensitive body 1 and fed to a fixing device by a feeding roller 8 and a suction belt 9. When cleaning or processing for jamming is performed, the member 11 is bent but is not deformed since it is the elastic body even in the case of coming in contact with the member 11. Thus, the peeling performance is prevented from lowering and the stable destaticization is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application Field The present invention relates to a peeling device for peeling a transfer plate from a photoreceptor in an electrophotographic image forming apparatus.

Prior Art In a conventional electrophotographic image forming apparatus, as shown in FIG. 3, in order to convey the transfer paper A on which the toner on the photoreceptor L has been electrostatically transferred by the transfer device 2 to the fixing device, A peeling device 3 is provided on the downstream side of the transfer device 2 in the direction of rotation of the photoreceptor 1, for removing static electricity from the transfer paper A and peeling the transfer paper A from the photoreceptor l.

As shown in FIG. 4, the peeling device 3 is arranged in parallel with a supporting member 5 so that a static eliminating blank 4 having conductivity as a static eliminating member is not in contact with the transfer paper A and is perpendicular to the conveyance direction of the transfer paper A. The static eliminating brush 4 is grounded in order to eliminate static electricity by causing self-discharge between the brush 4 and the transfer paper A.

In FIG. 3, 6 is a charger case of the transfer device 2, 7 is a charger wire, 8 is a conveyance roller, 9 is a suction belt, and IO is a guide plate for guiding the transfer paper A to the photoreceptor 1.

In the above configuration, the transfer paper A is charged by the transfer device 2 to a polarity opposite to that of the toner on the photoreceptor l, and the transfer paper A adsorbs the toner on the photoreceptor l.

Then, electric discharge occurs between the transfer paper A and the static elimination brush 4 of the peeling device 3, and the static electricity on the transfer paper A is eliminated.

Static-free transcription! The EA is smoothly peeled off from the photoconductor 1 and conveyed to the fixing device via the conveyance roller 8 and the satanylon belt 9.

Furthermore, a serrated barbed conductor may be used as the static eliminating member instead of the static eliminating brush 4, and the transfer paper A is peeled off from the photoreceptor 1 in the same manner.

<Invention or Problem to be Solved> However, when the static eliminating brush 4 or a serrated conductor is used as the static eliminating member, the static eliminating brush 4 etc. may be deformed during cleaning or jam removal, resulting in a decrease in its performance. invited.

Further, in the case of the static elimination brush 4, there is a problem in that not only the performance deteriorates due to hair loss, but also the hair loss adheres to the transfer device 2 and causes leakage.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an image forming apparatus using a static eliminator that does not cause deterioration in transfer paper peeling performance due to deformation or hair loss during cleaning or jam removal.

Second Means for Solving the Problem 〉 The second means for solving the problem according to the present invention is the second means for solving the problem. As shown in the figure, the transfer device 2 is placed around the rotatable photoconductor 1.
A static eliminating member 1l is provided on the downstream side in the rotational direction for eliminating static electricity from the transfer paper A and peeling it off from the photoreceptor l.
Reference numeral 11 is made of a conductive elastic plate, and is arranged so as not to contact the transfer paper A and to be orthogonal to the conveying direction of the transfer paper A.

<Function> In the above problem solving means, toner having a polarity opposite to the surface potential of the photoreceptor 1 is attached to the surface of the photoreceptor 1. Then, the transferred transfer paper A is charged with a charge having a polarity opposite to that of the toner by the transfer device 2, and the toner on the photoreceptor l is adsorbed and transferred to the transfer paper A.

At this time, since a weak potential remains on the photoreceptor l except for the microscopic area, the transfer paper A tries to move while adsorbed to the photoreceptor l. However, electric discharge occurs between the transfer paper A and the charge removal member II due to the charge removal member II, and the charge is removed from the transfer paper A, preventing it from adhering to the photoreceptor 1 and peeling it off from the photoreceptor l.

Here, when cleaning the image forming apparatus or removing a jam, even if it comes into contact with the static eliminating member 11, the static eliminating member [I is an elastic body, so it only flexes and does not deform, so the transfer There is no deterioration in the peeling performance of ZI A. Moreover, accidents such as cutting one's hand when coming into contact with the static eliminating member 11 can be prevented.

Furthermore, unlike the conventional static eliminating brush 4, no leakage occurs due to hair loss, so that stable static elimination of the transfer paper A can be performed.

<Example> Embodiments of the present invention will be described below based on the drawings.

[First Embodiment] FIG. 1 shows a configuration diagram of an image forming apparatus showing a first embodiment of the present invention. Note that the same components as in the conventional art are given the same reference numerals.

In the image forming apparatus according to this embodiment, as shown in the figure, a photoconductor 1 is transferred from a transfer device 2 disposed around a rotatable photoconductor 1.
A static eliminating member 11 is provided on the downstream side in the rotational direction for eliminating static electricity from the transfer paper A and peeling it off from the photoreceptor 1.
1 is made of a conductive elastic plate, and is disposed so as not to contact the transfer paper and perpendicular to the conveyance direction of the transfer paper A.

The photoreceptor I is drum-shaped and is connected to the transfer device 2.
On the upstream side in the direction of one rotation of the photoreceptor, there is a charging device I2 that charges the photoreceptor l and an exposure device (not shown).
Developing devices 13 are respectively disposed for applying toner charged with a polarity opposite to that of the photoreceptor 1 to the electrostatic latent image formed by exposure to light from the photoreceptor 1 to visualize the image.

The transfer device 2 includes a charger case 6 and a charger wire 7 stretched across the case 6 so as to be perpendicular to the conveyance direction of the transfer paper A.

A charging opening 14 is provided on the side of the photoreceptor l of the case 6, and the opening l4 allows corona discharge from the charger wire 7 to pass through the transfer paper A between the case 6 and the photoreceptor l.
It is formed to have the same width as the photoreceptor 1 in the axial direction of the photoreceptor 1 so as to charge the photoreceptor 1.

Moekki static neutralization member 11 is made of silicone rubber mixed with conductive materials such as graphite and carbon fiber to have a surface resistance of 103Ω or less, and is formed into a rectangular parallelepiped shape with a width of 0.5 to 1 mm. There is. The static eliminating member II is the static eliminating member I.
The distance Q between the upper end 11a of l and the transfer paper A is! ~2+ma
They are arranged so that the transfer paper A and the transfer paper A are grounded so as to cause an electric discharge to occur between them.

Note that the other configurations are the same as those of the prior art.

In the above configuration, toner having a polarity opposite to the surface potential of the photoreceptor 1 is attached to the surface of the photoreceptor 1 on which the electrostatic latent image is formed by the exposure device by the developing device 13, and is visualized. Then, the transferred paper A is given a charge of opposite polarity to the toner by the transfer device 2, and the photoconductor! The upper toner is adsorbed and transferred to transfer paper A.

At this time, since a weak potential remains on the photoreceptor 1 other than the developing area, the transfer plate A tries to move while adsorbed to the photoreceptor 1. However, the static eliminating member 11 generates a discharge between the transfer paper A and the static eliminating member it, eliminating the static electricity on the transfer paper A, preventing it from adhering to the photoreceptor l, and causing it to be peeled off from the photoreceptor l.

Then, the transfer paper A is conveyed to the fixing device by a conveyance roller 8 and a suction belt 9.

Here, when cleaning the image forming apparatus or removing a jam, even if the static eliminating member 11 comes into contact with the static eliminating member 11, since the static eliminating member 1l is an elastic body, it only flexes and does not deform.

Therefore, since the static eliminating member 11 is not deformed, the transfer plate A
of! {No deterioration in separation performance occurs. Moreover, the static eliminating member 11
Accidents such as cutting your hand when coming into contact with the product can also be prevented. Furthermore, unlike the conventional static eliminating brush 4, no leakage occurs due to hair loss, so that stable static elimination of the transfer paper A can be performed.

[Second Embodiment] FIG. 2 is a block diagram of an image forming apparatus showing a second embodiment of the present invention.

As shown in the figure, the image forming apparatus of this embodiment is provided with a transfer device power supply l5 that applies a voltage of negative polarity to the transfer device 2, and a static eliminating member l! A static eliminating power source 16 for applying a voltage of positive polarity opposite to that of the transfer device 2 is provided on the transfer device 2.
The voltage applied to the static eliminating member l1 is set to a voltage of 2 to 4 KV to such an extent that the static eliminating member 11 does not cause self-discharge.

Note that the other configurations are the same as those of the first embodiment, and the same effects are achieved; however, in this embodiment, the static eliminator tl
Since the potential difference between tll and the transfer paper A becomes large, the transfer paper A can be easily peeled off from the photoreceptor l.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

Although the static eliminating member is grounded in this embodiment, it may be ungrounded. Further, a conductive resin may be used for the static eliminating member.

Effects of the Invention> As is clear from the above description, according to the present invention, the transfer paper is destaticized and removed from the photoconductor downstream of the transfer device disposed around the rotatable photoconductor in the rotational direction of the photoconductor. A static eliminating member is provided for peeling, and the static eliminating member is made of conductive elastic material and is arranged so as not to contact the transfer paper and perpendicular to the transfer direction of the transfer paper, so that it does not come into contact with the static neutralizing member. Even if the charge removal member is not deformed, the peeling performance of the transfer paper does not deteriorate. What's more, you can prevent accidents such as cutting your hand when you come in contact with the electricity remover.

In addition, unlike conventional static eliminating brushes, no leakage occurs due to hair loss, so there is an excellent effect of stably eliminating static electricity from the transfer paper.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an image forming apparatus showing a first embodiment of the present invention, FIG. 2 is a block diagram of an image forming apparatus showing a second embodiment of the present invention, and FIG. 3 is a block diagram of a conventional image forming apparatus. The configuration diagram and FIG. 4 are also perspective views of the static eliminating member. ! : photoreceptor, 2: transfer device, ll: static elimination member, A: transfer paper. Applicant Sharp Chinshi Co., Ltd.

Claims (1)

[Claims] A charge eliminating member for removing charge from the transfer paper and peeling it off from the photoconductor is provided downstream of the transfer device disposed around the rotatable photoconductor in the direction of rotation of the photoconductor, and the charge eliminating member is made of a conductive elastic plate. An image forming apparatus characterized in that the image forming apparatus is arranged in a non-contact manner with respect to the transfer paper and perpendicular to the conveying direction of the transfer paper.