JPH03166572A - Paper feeding mechanism for recorder - Google Patents

Abstract

PURPOSE:To smoothly carry a sheet between a transfer position and a fixing position by using a transfer roller as a transfer means and adopting such a constitution that a conductive belt is stretched between the transfer roller and a roller. CONSTITUTION:The conductive belt 12 stretched between the transfer roller 11 and the roller 6 is driven by the transfer roller 11 as the transfer means rotating in an arrow direction and travels in the arrow direction, when the recording is carried out. The conductive belt 12 is electrified by a charge added to the transfer roller 11. Then, the sheet 100 passing through the transfer position is smoothly carried up to the fixing position while the sheet is attracted to the conductive belt 12 by electrostatic force. Therefore, the deflection and jumping of a sheet are prevented. Thus, the missing of a transfer and irregularity in the transfer are prevented, and excellent recording can be carried out.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a paper feeding mechanism used to transport paper between a transfer position and a fixing position in a recording device such as a desktop electrophotographic printer or a copying machine. The purpose of this method is to form a toner image on an image carrier, and transfer the toner image onto the paper being fed onto the image carrier, facing the image carrier. In a recording apparatus that fixes a toner image by passing the paper between a heat roller and a roller opposite to the heat roller after the paper is transferred by a transfer means, the transfer roller is used as the transfer means, and the transfer roller is A conductive belt is stretched between the roller and the roller.

[Industrial application field]

The present invention relates to a paper feeding mechanism used to transport paper between a transfer position and a fixing position in a recording apparatus such as a desktop electrophotographic printer or a copying machine.

[Technology of technology]

FIG. 3 is a side view showing the main structure of a conventional desktop electrophotographic recording device, in which 1 is a photosensitive drum (image carrier), 2 is
3 is a transfer charger, and 3 is a fixing device.

The transfer charger 2 faces the photosensitive drum 1 at the transfer position.

The fixing device 3 is provided at a fixing position and includes a heat roller 5 having a built-in heater 4 and a rubber roller (roller) 6 that is in pressure contact with the heat roller 5 .

During recording, the photosensitive drum 1 is rotated in the direction of the arrow to form a toner image on its surface. To explain the details, around the photosensitive drum 1, although not shown, there is a front charger,
Exposure means. Developing device. A static eliminator and cleaner are installed to eliminate static electricity on the drum surface due to the toner image or front charger. This is realized by forming an electrostatic latent image thereon using an exposure means or developing the latent image using a developing device. On the other hand, paper 10
0 is fed out from a storage section (not shown) at a predetermined timing with the rotation of the photosensitive drum l and sent to the transfer position by the roller 7, where it is transferred to the transfer charger 2 onto the paper 100.
toner image transfer is performed.

Thereafter, the paper 100 is sent to the fixing position, where the fixing device 3
The toner image is fixed by The paper that has been fixed is ejected to a stack section (not shown) on the right, but the claw 8 is
It plays a role in peeling off the paper from the heat roller 5 and ensuring that it is ejected. After the transfer has been completed, the surface of the photosensitive drum is cleaned to remove static electricity by a static eliminator and a cleaner, and one cycle of operation is thus completed.

[Problem to be solved by the invention]

However, in the conventional structure as described above, the paper on which the toner image has been transferred is not transported smoothly before it enters the fixing device, resulting in irregular transfer or missing transfer. This will be explained in detail as follows.

(1) When the leading edge of the paper after transfer hits the heat roller 5, the paper bends as shown in the figure.

(2) Furthermore, when the trailing edge of the paper passes the roller 7, the paper is no longer held down, and the trailing edge of the paper bounces as shown by the dotted line.

These factors cause transfer disturbances and transfer omissions.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding mechanism for a recording apparatus that can smoothly transport paper between a transfer position and a fixing position.

Means for Solving Problem C] FIG. 1 is an explanatory diagram of the principle of the present invention. In the figure, 11 is a transfer roller and 12 is a conductive belt. Note that the same reference numerals are used for members that are common to the conventional one.

The transfer roller 11 is used as a transfer means in place of a conventional transfer charger, and is used as a transfer means to move the image carrier l at the transfer position.
The toner is provided with a charge opposite to that of the toner. Reference numeral 13 denotes a power source for applying electric charge, which is added for reference.

The conductive belt 12 is stretched between the transfer roller 11 and the roller 6.

[For production]

During recording, a toner image is formed on the image carrier l using the same procedure as in the past, and the toner image is transferred onto the transfer roller 1 which rotates in the direction of the arrow.
Transfer by 1. After that, the paper is sent to the fusing position,
At this point, toner image fixing is performed.

During this recording, the conductive belt 12 is driven by the transfer roller 1l rotating in the direction of the arrow and travels in the direction of the arrow; however, the conductive belt 12 is charged by the charge added to the transfer roller 11.

Therefore, the paper 100 that has passed the transfer position is transferred to the conductive belt 1.
The paper is smoothly transported to the fixing position while being attracted to the paper by electrostatic force, eliminating the problems of conventional paper bending and bouncing. Therefore, there are no transfer omissions or irregular transfers, and good recording is possible.

〔Example] Embodiments of the present invention will be described below with reference to FIG.

FIG. 2 is a side view showing the paper feeding mechanism of the recording device of this example.
In the figure, 21 is a static eliminator. Note that the same reference numerals are given to the same members as in FIG.

As is clear from this figure, the paper feeding mechanism of the present invention has a power source l
A transfer roller 1l, which is given a charge opposite to the toner charge by 3 and rotates in the direction of the arrow, is used as a transfer means, and a conductive belt 12 is wrapped around the transfer roller 11 and roller 6. During recording, the conductive belt 12 running in the direction of the arrow as described above attracts and holds the transferred paper and smoothly conveys it to the fixing position.

Therefore, the conventional problems of paper bending and splashing are eliminated, and transfer failure is eliminated. Transfer disturbances can be prevented. During fusing, the paper usually sticks to the heat roller 5, so conventionally a claw was provided to separate the paper from the heat roller 5, but in the present invention, the belt side also has suction force, so there is no need to provide a claw. Paper can be ejected.

The charge on the conductive belt 12 that has passed through the fixing position is removed by a static eliminator 2.
1 is removed. Therefore, even if there is paper attached to the conductive belt l2, it can be peeled off.

〔Effect of the invention〕

As described above, according to the present invention, the paper can be held by the adsorption force of the conductive belt and transported smoothly from the transfer position to the fixing position, so that it is possible to eliminate transfer omissions and transfer irregularities and improve recording quality. can.

Furthermore, the claws that were conventionally required to separate the paper from the heat roller are no longer necessary.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a side view showing a paper feeding mechanism of a recording device according to an embodiment of the present invention, and FIG. 3 is a side view showing the main structure of a conventional recording device. In the figure, 1 is a photosensitive drum (image carrier), 5 is a heat roller, 6 is a rubber roller (roller), and 1l is a transfer roller (transfer means).

Claims (1)

[Scope of Claims] After forming a toner image on an image bearing member and transferring the toner image to a sheet of paper fed onto the toner bearing member by a transfer means facing the image bearing member, the sheet of paper is , a recording device that fixes a toner image by passing the toner image between a heat roller and a roller (6) facing the heat roller, wherein a transfer roller (11) is used as the transfer means, and the transfer roller (11) and A paper feeding mechanism for a recording apparatus, characterized in that a conductive belt (12) is stretched around the roller (6).