JPS63134444A - Transfer material transporting device for image forming apparatus device - Google Patents

Abstract

PURPOSE:To prevent a transfer material entering a transfer section from flutter by providing additionally a means for holding the transfer material not to interfere with the transportation before the transfer material reaches the transfer section. CONSTITUTION:A guide roller 4 made of conductive rubber is provided at the downstream side of a transporting path 3, while it contacts a front end of an elastic member such as Mylar sheet 6 applied on the inside of an upper guide plate 3a. By this constitution the front end of a transfer material P supplied in the direction of arrow B passes smoothly through between the Mylar sheet 6 and the roller 4 with the elasticity of Mylar sheet 6 and the transfer material is then transferred as is held between the sheet and roller until the rear end passes through, so that no flutter is generated and an image in the transportation is not disturbed.

Description

Detailed Description of the Invention (1) Object of the Invention (Field of Industrial Application) The present invention relates to an image forming apparatus that uses an electrostatic recording process, such as an electrostatic copying machine or a printer, and particularly relates to a transfer material conveying device thereof. It is something.

(Prior Art and Issues to be Solved) Conventionally, in this type of image forming apparatus, a cylindrical photoreceptor is provided as a means for supplying a sheet-like transfer material such as paper to a toner image area on the surface of an image carrier. Regarding copying machines,
For example, as schematically shown in FIG. 4, a transfer material is sent through a conveying path 3 via a pair of registration rollers 5 to a transfer site where a transfer charger 7 is placed close to a photoreceptor l traveling in the direction of arrow A. It is known that it provides

However, such a configuration has the drawback that the transfer material fluttering due to the curved portion 3a at the tip of the guide plate forming the conveyance path, causing image disturbance.

Furthermore, as shown in FIG. 5, it has been proposed that at least one guide roller 8 is disposed on the downstream side of the conveyance path to smoothen the feeding of the transfer material. However, it was not possible to prevent the flapping of the trailing edge of the transfer material, which caused deterioration in image quality.

The present invention has been made in order to cope with the above-mentioned situation, and provides a transfer material conveying device that can reliably prevent fluttering of the conveyed transfer material and obtain high-quality images with a simple configuration. The purpose is to

(2) Structure of the invention (technical means for solving the problem, its effect) In order to achieve the above object, the present invention provides a transfer material conveying device of an image forming apparatus as described above, in which a transfer material reaches a transfer site. The present invention is characterized in that a means for holding the transfer material at the previous position so as not to impede conveyance is provided.

With this configuration, the transfer material entering the transfer site does not flap and does not adversely affect the transfer.

(Description of an Embodiment) FIG. 1 is a side view of a main part showing an embodiment in which the present invention is applied to a copying machine equipped with a rotating cylindrical photoreceptor.
A transfer charger 7 is disposed close to the photoreceptor 1 rotating in the direction, and the transfer material P is sent to the transfer site through a conveyance path 3 formed by an upper guide plate 3a and a lower guide plate 3b. shall be provided.

As is well known, there are, of course, disposed around the photoconductor the members necessary for image formation, such as a charger, a developer, and a cleaning device, but these are not included in the present invention. are not directly related, so they are all omitted.

In the above-mentioned conveyance means, as can be seen from FIGS. 1 and 2, a guide roller 4 made of conductive rubber is disposed on the downstream side of the conveyance path 3, and a guide roller 4 made of conductive rubber is placed on the inside of the guide upper plate 3a. The tip of an elastic seed member such as a Mylar sheet 6 attached thereto is configured to abut against this.

It is assumed that the roller 4 is driven by an appropriate means such as a gear disposed at the end of its shaft so as to be synchronized with the circumferential speed of the photoreceptor.

With this structure, the leading edge of the transfer material P fed in the direction of arrow B passes smoothly between the Mylar sheet 6 and the roller 4 due to the elasticity of Mylar, and is then held by both until it reaches its rear end. Since the image is conveyed in a state in which the image is transferred, there is no possibility of flapping, and the image is not disturbed during transfer.

As the guide roller, metal, conductive resin, etc. may be used, and instead of the Mylar sheet, a thin metal plate, a plastic film, etc. may be used.

Further, the Mylar sheet may be made to contact the roller not at its tip but at its belly portion.

Furthermore, as shown in FIG. 3, if the tip of the Mylar sheet is formed so that the central portion thereof forms a bulging edge 6a, it is possible to have the effect of smoothing out wrinkles in the transfer material.

The case where the present invention is applied to a copying machine has been described above, but
It will be easily understood that the present invention is not limited to this and can be applied to other image forming apparatuses. (3) Effects of the Invention The present invention has the above-described configuration. Because of this, the part of the transfer material that has reached a position away from the registration roller is conveyed while being held in its normal position.
This has the effect of effectively preventing image distortion and obtaining high-quality images.

[Brief explanation of the drawing]

Fig. 1 is a side view of main parts showing an embodiment in which the present invention is applied to a copying machine, Fig. 2 is a partially slanted view showing only the conveyance part, and Fig. 3 is a plan view showing an embodiment of the transfer material ejection part. 4 and 5 are side views of essential parts of a known conveying means. ■... Photoreceptor, 3... Conveyance path, 4... Guide roller, 6... Mylar sheet, 7--Transfer charger. Ogi l ward map 3

Claims (1)

[Scope of Claims] A transfer material conveying means for supplying a transfer material to a transfer site where a transferable image of an image forming apparatus is transferred; a guide roller disposed between the tip of the conveying means and the transfer site; and the conveying means. A transfer material conveying device of an image forming apparatus, comprising an elastic sheet member attached to the guide roller such that its substantially leading end abuts the guide roller and presses the supplied transfer material against the guide roller. .