JPS608873A - Cleaning device of heat fixation device of electronic copying machine - Google Patents

Abstract

PURPOSE:To clean a toner sticking to the surface of a pressure roll without any damage by bringing a cleaning brush into contact with a pressure roll, and rotating them in the opposite directions. CONSTITUTION:The pressure roll 3 is brought into press contact with a heat roll which is covered with a heat-resistant, high releasing layer 1b and incorporates a heat source 2 to fix a toner image 4 on a form 5 thermally. The cleaning brush 6 which contacts the circumferential surface of the pressure roll 3 rotates in the opposite direction to the heat roll 3 to remove the toner sticking to the surface and collect it in a receiving dish 7. Therefore, the toner is cleaned sufficiently without caking the toner nor damaging the pressure roll 3, so no offset phenomenon occurs even in lont-period use.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a cleaning device for cleaning a pressure roll provided in a heat fixing device if of an electronic copying machine.

BACKGROUND OF THE INVENTION Conventional electronic copying machines have widely adopted heat-fixing device cabinets because of their simple structure, high thermal efficiency, and no risk of fire. However, although the heat fixing device has the above-mentioned advantages, it also has the disadvantage that a so-called offset phenomenon occurs in which the toner image transferred to the heating roll during fixing is transferred again to the paper. Conventionally, in order to completely prevent this, an fI substitute type agent such as Cricon oil is applied to the surface of the pressure roll, but it is necessary to install a tank to accommodate all the M type agent, so it is not possible to reproduce it. In addition to increasing the size of the paper itself, there were also problems such as the release agent staining the paper. In order to improve such non-A alloys, toners have recently been developed that do not cause the offset phenomenon even without using any release agent, but even if such toners are used, the offset phenomenon may occur after long periods of use. It is not possible to completely prevent the offset phenomenon, such as when the

In addition, even if all of the toner mentioned above is used, if the number of copies exceeds tens of thousands, the cause of the offset phenomenon is c. The toner floating all over the copying machine adheres to the heating roll, and this is further transferred to the heating roll. This is because the toner image transferred to the pressure roll during copying accumulates during long-term use. When toner accumulates on the pressure roll, it not only causes an offset phenomenon but also causes paper to adhere to the pressure roll due to the adhesiveness of the toner, causing paper jams. Conventionally, a sponge roll is brought into pressure contact with the pressure roll, and the sponge roll is used to remove all of the toner adhering to the pressure roll, and a scraper blade is used to scrape off the toner adhering to the pressure roll. However, with the former method, the toner adheres to the pressure roll due to the stickiness of the sponge roll, making it impossible to thoroughly clean the entire pressure roll, and with the latter method, problems such as damage to the surface of the pressure roll occur. was there.

Purpose of the Invention The present invention has been made for the purpose of improving the above-mentioned problems, and provides a heat fixing device for an electronic copying machine that is capable of cleaning all the toner attached to the surface of the pressure roll without damaging the pressure roll. The purpose of this invention is to provide a cleaning device for cleaning.

1. Composition of the Invention A heating roll equipped with a heat source and a sheet of paper to be fixed are pressed against each of the heating rolls to fix the paper i'i@1. - A cleaning device that removes toner adhering to the surface of the pressure roll by bringing a heat-resistant and abrasion-resistant cleaning brush into contact with the pressure roll of the heat fixing device that does not use a release agent. .

EXAMPLE Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.

In the figure, reference numeral 1 denotes a heating roll that constitutes the entire heat fixing device of an electronic copying machine, which is constructed by covering the outer peripheral surface of a metal core 1a containing a heat source 2 with a heat-resistant high release layer 1h.
It is rotated in the direction of the arrow by a JIK dynamic system (not shown). 3
is a pressure roll that is in pressure contact with the heating roll 1, and presses the paper 5 onto which the toner image 40 has been transferred to the heating roll 1, so that the heat of the heating roll 1 causes the toner to be removed from the paper 5.
It is designed to be heat-fixed. The pressure roll 3 is made of a heat-resistant elastic material such as silicone rubber, and a cleaning brush 6 is attached to the circumferential surface of the pressure roll 3.
has been contacted. The cleaning brush 6 has a core 6α made of metal such as aluminum, surrounded by heat-resistant and wear-resistant fibers such as metal fibers and heat-resistant synthetic resin fibers.
hf: A planted device that is rotated in the opposite direction to the pressure roll 3 by a drive source (not shown) to remove toner adhering to the surface of the pressure roll 3, and toner removed by the cleaning brush 6 to be cleaned. The brushes are collected in a tray 7 installed below the brush 6.

Incidentally, the cleaning brush 6 may not be rotated but may be rotated and installed in the receiving tray 7 as shown in FIG. 2. Further, as shown in FIG. 3, if the tray 11 and 7 are formed into a semi-cylindrical shape and a cleaning brush 6 is provided in the tray 7 so as to be in contact with approximately half the circumference of the pressure roll 3, the cleaning effect can be further improved. do.

Effects of the Invention As detailed above, this invention removes toner adhering to the pressure roll 3 with the cleaning brush 6 brought into contact with the pressure roll 3. -C does not solidify the toner unlike other types of removers, and it can thoroughly clean all the toner adhering to the pressure roll side 3 like a scraper blade, so even if it is used for a long period of time, it can be offset. If this does not occur and the cleaning brush 6 becomes soiled, by replacing it with a new one, the initial cleaning effect can be obtained again.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing other embodiments. +1l-j heating roll, 2 is a heat source, 3 is a pressure roll 5 is paper, 6 is a cleaning brush.

Claims (1)

[Claims] It is equipped with a heating roll 1 equipped with a heat source 2 and a pressure roll 3 that presses the paper 5 to be fixed onto the heating roll 1. A cleaning device for a heat fixing device in an electronic copying machine, wherein the cleaning brush 6 is brought into full contact with the pressure roll 3 to remove toner adhering to the surface of the pressure roll 30.