JPH02109080A - Fixing conveyor device - Google Patents

Abstract

PURPOSE:To obtain the quality of a stable conveyance by putting an endless conveying belt between a follower roller near to the downstream side of a photosensitive body and a driving roller of a paper ejecting part so that the conveying belt may be sandwiched between a pair of fixation rollers. CONSTITUTION:A transfer paper 2 after transferred is conveyed to the direction of the pair of the fixation rollers 9 by the endless transfer belt 8 which is put between the follower roller 6 disposed near to the downstream side of the photosensitive body 1 and the driving roller 7 which also functions as a paper ejecting roller disposed below. The pair of paper ejecting rollers are constituted of the paper ejecting roller 12 on the upper side and the roller 7. When the transfer paper 2 is brought into to be held between the fixation roller 14 and a pressurizing roller 15, the paper 2 is ordinarily shocked at the thickness of the paper and a transfer part is influenced by the shock, so that the transfer blur sometimes occurs. But by this constitution, since the transfer paper 2 is conveyed as closely contacting to the belt 8, the transfer blur cannot occur. And the quality of the stable conveyance can be obtained by integrating a conveying system such as the conveying paper after transfer, the fixation part and the paper ejecting part.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves adhering toner to an electrostatic latent image on a photoconductor to form a visible image, transferring this to a transfer paper, and further processing in a fixing section. The present invention relates to an electrophotographic apparatus that obtains a copy image on a transfer paper by fixing it, and particularly relates to a mechanism for conveying, fixing, and discharging the transfer paper after toner image transfer (this is referred to as a fixing and conveying device).

[Conventional technology]

FIG. 2 shows a schematic diagram of a general heat fixing device.

This heat fixing device includes a fixing roller 2 that has a built-in heater 21.
2 and a pressure roller 23 constitute the main parts, and around the fixing roller 22 there are coated felt 24 for offset prevention, a fixing blade 25, and a thermistor 26 for temperature detection.
A claw 27 for marking the transfer paper is provided, and a temperature fuse 28 is provided near the claw 27. The pressure roller 23 is provided with a pressure lever 29 that presses it against the fixing roller 22. 30 is a paper discharge sensor.

Conventional fixing and conveying devices generally have a belt conveying device upstream of the fixing device configured as described above, and a pair of discharge rollers provided downstream. There is also a known system in which a conveying belt is provided in the fixing section (Utility Model Publication No. 53-51166), but in any case, the conveying section, fixing section, and
It consisted of a paper discharge section and three independent transport systems.

[Problem to be solved by the invention]

Therefore, with the conventional apparatus, it is difficult to stabilize the conveyance quality, and the mechanism is complicated, resulting in high costs.

Furthermore, when transferring the transfer paper between the fixing roller 22 and the pressure roller 23, if the rotational speed of the roller pair and the conveyance speed on the upstream side are different, image transfer may be blurred when the transfer paper is caught in the nip of the roller pair. It can also be dangerous.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing and conveying device that eliminates the above-mentioned drawbacks and does not impair image quality by integrating a conveyance system including a fixing section.

[Means to solve the problem]

For this purpose, the present invention provides a fixing conveyance system for an electrophotographic apparatus in which a transfer paper on which a toner image on a photoreceptor has been transferred is passed between a pair of fixing rollers, the toner image is fixed, and the paper is discharged from a paper discharging section. In the mounting, an endless conveyor belt is stretched between a driven roller provided near the downstream side of the photoconductor and a drive roller of the paper section so as to be sandwiched between the pair of fixing rollers. shall be.

[Function] In the present invention, the entire conveyance system after transfer is composed of one endless belt, and the fixing roller and pressure roller are provided to sandwich this belt, so that the conveyance speed is uniform and stable. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a fixing and conveying device according to an embodiment of the present invention, in which 2 is a photoreceptor, 2 is a transfer sheet on which a toner image 4 has been transferred from the photoreceptor 1 by the action of a transfer charger 3, and 5 is a transfer sheet. 1 is a 11-minute charger that separates the transfer paper 2 after the toner image has been transferred from the photoreceptor 1 by neutralizing static electricity. The transfer paper 2 after the transfer is passed between a driven roller 6 provided near the downstream side of the photoreceptor 1 and a drive roller 7 which also serves as a lower paper ejection roller.
The sheet is conveyed in the direction of the pair of fixing rollers 9 by an endless conveyor belt 8 made of nickel and having a thickness of approximately 100 μm.

Since the conveyance heald 8 is an electrostatic adsorption belt, a bias power supply 10 is connected to the electrostatic driven roller 6, and a bias of 3 to 5 KV is applied to the conveyance belt 8. Further, a blade 11 for removing paper dust and toner is in contact with the conveyor belt 8.

The drive roller 7 and the upper paper ejection roller 12 constitute a paper ejection roller pair.

By the way, the fixing roller pair 9 is composed of a fixing roller 4 having a built-in heater 13 and a pressure roller 15 whose outer surface is coated with sponge-like silicone rubber, and around the fixing roller 14 there is an oil coating roller L6 for preventing offset. A thermistor 17 for temperature detection is provided.

Since the conveyor belt 8 is biased, the fixing roller 14 must be made of an insulator. Therefore, the surface is covered with silicone rubber having a thickness Q of approximately 3 mm. Further, the surface of the pressure roller 15 is made spongy to provide a large nip N. The conveyor belt 8 is sandwiched between a fixing roller 14 and a pressure roller 15, and the conveyor belt 8 is sandwiched between a fixing roller 14 and a pressure roller 15.
The transfer paper 2 that is attracted and conveyed is sufficiently fixed in the large nip N. 18 is a paper discharge tray.

When the transfer paper 2 is held between the fixing roller 1°4 and the pressure roller I5, if? I always go to J'! However, in this embodiment, the transfer paper 2 is conveyed in close contact with the conveyance heald 8, so this can be avoided. Can be done. Also, the transfer paper 2 after fixing is l&' i! Since it is adsorbed to the belt 8, there is no need for a separation claw, which not only reduces costs, but also eliminates the problem of sillage at the separation claw.

[Effect of Zemei]

As explained above, according to the present invention - 1. after transfer.
(9) By integrating the S yarn feeding section, the fixing section, and the paper discharge section, stable conveyance quality can be obtained, and a highly reliable fixing conveyance device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a fixing and conveying device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional fixing device. DESCRIPTION OF SYMBOLS 1... Photoreceptor, 2... Transfer paper, 6... Followed roller, 7... Drive roller, 8... Conveyance belt, 8...
Fixing port - Ra pair. Figure 2

Claims (1)

[Claims] In the fixing and conveying device of an electrophotographic device, in which the transfer paper with the toner image on the photoreceptor transferred is passed between a pair of fixing rollers, the toner image is fixed, and the paper is ejected from the paper ejection section. A fixing and conveying device characterized in that an endless conveying belt is stretched between a driven roller provided and a drive roller of a paper ejection section so as to be sandwiched between the pair of fixing rollers.