JPS58144867A - Fixing device of electrophotographic printer - Google Patents

Abstract

PURPOSE:To enhance effect of cleaning of a heater roll, by arranging cleaning felt along the peripheral surface of the heater roll, and pressing it into contact with the surface. CONSTITUTION:Cleaning felt 14 is attached to the peripheral surface of a heater roll 12, and a guide member 16 is provided on the reverse side of the felt 14, felt pressing members 17 is protruded and the felt 14 is pressed into contact with the surface of the roll 12. A toner mixed with paper powder, fibers, etc. are securely catched in order to prevent a sheet of paper 10 from staining, thus enhancing cleaning effect.

Description

[Detailed description of the invention] This invention relates to a fixing device in a true printing press.

Conventionally, this type of electrophotographic printing machine has a main charging device 2, a light source section 3, a lens group 4, a developing device 5, a transfer device 6, which are provided around a photoreceptor 1, as shown in FIG. paper transport section 7;
It consists of a part that performs a series of electrophotographic glosses, including a cleaning section 8 and a remover 9, and a fixing device that fixes the toner image 11 transferred to the paper 10 by the transfer device 6. Incidentally, as a fixing device, a thermocompression bonding method using two rolls, that is, a heater roll 12 and a backup roll 16 as shown in FIG. 2, is often used because of its high fixing efficiency. This type of method is called a thermocompression bonding method using the heater roll 12, but the toner image 11 on the paper 10
Since a portion of the water adheres to the surface of the heater roll 12, a cleaning mechanism such as the cleaning felt 14 shown in FIG. 2 is used. In such a fixing device, as shown in FIG. 6, the toner 15 accumulated between the heater roll 12 and the cleaning felt 14 passes through them as the heater roll rotates 120 times and is deposited on the paper. 1
There was a problem of contact with 0 and contaminating it.

The present invention solves the above-mentioned problems, and is an electrophotographic printing machine in which the toner accumulated between the heater roll and the cleaning felt is sufficiently captured by the cleaning felt, so that the heater roll can be sufficiently cleaned at all times. The present invention provides a fixing device. That is, the present invention provides a fixing device for an electrophotographic printing machine that fixes a toner image by thermocompression bonding using a heater roll and a pick-up roll.
The cleaning felt for cleaning the heater roll is forcibly pressed against the circumferential surface of the heater roll.

An embodiment of the present invention will be described below with reference to the drawings.

Figure M1 is a schematic diagram of the electrophotographic printing machine.

Around the photoconductor 1, there are a main charger 2, a light source section 3 mainly consisting of a laser, a lens group 4 that focuses the light from the light source into an appropriate shape, a developer 5 that attaches toner to the photoconductor 1, and a photoconductor. a transfer device 6 that transfers the toner image on paper 10 to paper 10;
0 at the same speed as the photoconductor 1;
A cleaning device 8 and a static eliminator 9 are provided for cleaning, and a series of electrophotographic processes are performed by these devices. The toner image 11 transferred to the paper by the transfer device 6 is only attached to the paper 1'0 by electrostatic force, so if it is rubbed by hand, the toner image will be distorted. Therefore, it is necessary to fix the toner image 11 on the paper 10 to the paper using a fixing device. In addition to the method using a heater roll according to the present invention, this method includes an open method, a method using a flash lamp, a method using pressure, etc., but the thermocompression bonding method using a heater roll is the mainstream because of its high fixing efficiency. ing.

As shown in FIG. 4, the present invention includes disposing an IJ-Jungfelt 14 along the circumferential surface of the heater roll 12, passing it around the roller, and providing a guide member 16 on the back side of the cleaning felt 14. Push out the felt pressing member 17 from the guide member 16 and remove the cleaning felt 1.
4 is forcibly pressed onto the circumferential surface of the heater roll 12 and stored between the cleaning felt 14 and the heater roll 120.
The cleaning felt 14 reliably captures toner 15, which is a mixture of l-, paper powder, toner, fibers, and the like. According to the present invention, since the toners 15 are reliably captured on the cleaning felt 14, the cleaning felt 1
4 and the heater roll 12, and the captured toner 15 does not stain the supporting paper 10.

As explained above, since the beam felt of the present invention is pressed against the surface of the heater roll, the toner can be reliably captured by the rough cleaning felt, which has the effect of improving the cleaning performance of the heater roll. .

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an electrophotographic printing machine, FIG. 2 is a partially enlarged view of a conventional fixing section, and FIG. 3 is an enlarged view showing the relationship between a heater roll and a cleaning felt in a conventional fixing section. FIG. 4 is an enlarged view showing the relationship between the heater roll and cleaning felt of the fixing section according to the present invention. 10...Paper 12...Heater roll 13...Backup roll 14...Cleaning felt patent applicant NEC Co., Ltd. °')

Claims (1)

[Claims] (1) In the fixing device of an electrophotographic printing machine that fixes toner images by heat-pressing the toner image with the heater roll pack asoprol, a cleaning felt is placed along the circumferential surface of the heater roll, and the cleaning felt is attached to the heater roll. A fixing device for an electrophotographic printing machine characterized by being brought into pressure contact with the peripheral surface.