JPS5926751A - Picture forming device - Google Patents

Abstract

PURPOSE:To separate stably a wide variety of transfer materials, by providing a roughening means of roughening a surface of a transfer material which contacts an image carrier when supplying the transfer material to the image carrier. CONSTITUTION:A roughening member 14 which has, for example, a finely rugged surface is provided atop of a conveyance guide 15 provided between a paper feeding roll 13 and a resist roll 12. Then, the transfer paper P is sent out to a guide 15 by the paper feeding roll 13, but the surface of the transfer paper P contacting a photoreceptor 1 in the guide 15 is roughened properly when sliding on the roughening member 14, and then the material is supplied onto the surface of the photoreceptor 1 through the resist roll 12 and conveyance guide 16. This transferring material P decreases in smoothness, so its adhesion to the surface of the photoreceptor 1 is decreased to separate the material stably by destaticization.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus, and particularly to an image forming apparatus having means for roughening the surface of a transfer material before supplying the transfer material to an image carrier.

Hereinafter, an electrophotographic copying apparatus will be described as an example of an image forming apparatus.

Further, in this embodiment, a photoreceptor is used as an example of the image carrier, but the present invention is not limited to this, and for example, a photoreceptor may be used.

FIG. 1 shows an embodiment of an electrophotographic copying apparatus.

In the figure, a photoreceptor 1 is first uniformly charged by a one-off zone charging device 2, and then reflected light from an original image 4 by a lamp 6 is exposed onto the photoreceptor 1 through a short focal length lens array 5. form an image. Next, this static 'IIf latent image is visualized by a developing device B and becomes a toner image. On the other hand, photoreceptor 1
According to the rotation of the photoreceptor 1, the transfer material P is transferred to the conveyance system 11
The toner image is transferred by the transfer charger 7. Thereafter, this transfer material P is electrostatically separated by a separation charger 8, and the toner image on the transfer material P is fixed on the transfer material P by a fixing device 9 and discharged. Note that the remaining toner on the photoreceptor 1 is removed by a cleaner 10 in preparation for the next process.

Conventionally, as described above, when a silent separation means using corona discharge is used as a separation means, the quality of the separation greatly depends on the type of transfer material.

Therefore, it was sometimes difficult to perform stable separation across all transfer materials. In particular, in the case of transfer materials that have deteriorated in smoothness, they have excellent adhesion to the photoreceptor.
On the other hand, there are cases where it is difficult to separate this using only electrostatic force.

Therefore, the present invention improves the instability of separation in transfer materials with excellent smoothness as described above by roughening the surface of the transfer material that comes into contact with the image carrier, and is stable for all transfer materials. The purpose is to carry out the separation according to the

Hereinafter, one embodiment of the present invention will be explained using the drawings.

FIG. 2 shows a copying machine equipped with a roughening means to which an embodiment of the present invention is applied.

In the figure, 13 is a paper feed roller, and 12 is a registration roller. A roughening member 14 (for example, a surface having minute irregularities or sandpaper) is disposed at the tip of the conveyance guide 15 provided between the two. More specifically, the upper guide 15 of the guide 15 consists of the upper and lower guides 1sa*i5b.
A roughening member 14 was provided at the feeding side tip of a. Therefore, the transfer material P is fed to the υ guide 15 by the paper feed roller 15, and when it is rubbed against this guide, the surface of the P is roughened by an appropriate amount. Thereafter, it is supplied onto the surface of the photoreceptor 1 via the registration rollers 12 and the conveyance guide 16. After that, P undergoes a process of transfer and separation, but since the surface of P is rough and its smoothness is reduced, the layerability with the photoreceptor surface is reduced, and the transfer material P is sufficiently stable after static electricity removal. A separation will take place.

Still another example will be shown.

E+ Figure 3 shows the registration row 21 which is a RoJ movement pair.
2, the upper lawn is slightly roughened on the surface. Therefore, before the transfer material P is conveyed through the conveyance guide 16 to the photoreceptor surface, the surface of the transfer material P that is to be removed from the photoreceptor 1 can be roughened to an appropriate amount, and good separation properties can be obtained. .

Still another example will be shown.

FIG. 4 shows an example in which a half-moon-shaped row', 117 whose surface is slightly roughened, is used as a roughening means for the conveyance guide 1511tl. The surface of this half-moon-shaped lawn 170 is constantly moved by the transport guide 15 in synchronization with the passage of the leading edge of the transfer material P.
Waiting in between, the transfer material P is roughened only by the half circumference length of this row 2 from the leading edge. That is, when the leading edge of the transfer material P reaches the position of the container in the figure, the rubbing roller 17 starts rotating in synchronization with this, and when the transfer material P is conveyed to the position indicated by the diagonal line P', the roller 17 also moves to the position N17a. 1st movement, and from now on roller 17
and P are in a non-contact state. Therefore, in this embodiment, only the leading end (shaded area in the figure) of the transfer material P is roughened. In this way, the entire surface of the transfer material will not be unnecessarily roughened, and the adhesion between the tip of P and the photoreceptor 1 will be reduced.
A sufficiently stable separation takes place.

Note that the half-moon-shaped rollers shown above do not necessarily have guide 15.
It is not necessary to provide the roller separately in the transfer system; for example, it is also possible to use a lawn with a roughened surface for supplying the transfer material from the cassette that accumulates the transfer material to the conveyance system.

As described above, the present invention can achieve extremely stable separation by only slightly roughening the surface of the transfer material, and can also be applied to a wide variety of transfer materials.
In particular, it has the effect of stably separating even materials that have excellent smoothness and are difficult to separate conventionally.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a copying apparatus to which the present invention can be applied, and FIGS. 2, 3, and 4 are schematic diagrams of the flow side of the present invention. In the figure, 1-... photoreceptor, 12...0 registration roller, 14... roughening member, 15, 16...
0・Guide, 15a@Ki・・Upper guide, 15b**・
0 lower guide, 17...Φ half moon shaped roller. Applicant: Canon Co., Ltd. '4! −,',j,';

Claims (1)

Claims: (1) An image forming apparatus characterized by having a roughening means for roughening the surface of the transfer material that comes into contact with the image carrier before supplying the transfer material to the image carrier. (2) Claim No. 1 in which the roughening means is movable.
). (6) Claim No. 1 (1) in which the leading end of the transfer material is roughened.
).