JPS6247085A - Fixing apparatus - Google Patents

Abstract

PURPOSE:To prevent the abrasion of the coating layer of a heating roller and to improve the peeling property of the surface of the roller by forming a pressure roller using a soft material having an elasticity, and by constituting the pressure roller from an inner material impregnated with the silicone oil and a coating material composed of a porous fluorine resin. CONSTITUTION:The pressure roller 2 comprises a core 3 and the inner material 4 and the coating material 5 coating the inner material 4. The core 3 is composed of a metal such as an iron and an aluminum etc. or a heat-resisting plastics. The inner material is composed of the soft material having the elasticity such as a foamed silicone sponge, the silicone gum and a felt etc. and contains a large amounts of the silicone oil. The coating material is constituted from the porous fluorinated resin. The prescribed amount of the silicone oil contd. in the inner material 4 is supplied to the heating roller and a copying paper from the surface of the coating material 5 by contacting the pressure roller 2 with the heating roller 1 under the pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in an electronic copying machine or the like to heat-fix an unfixed image, for example, a toner image, to an image support material such as paper. The present invention relates to a fixing device that includes a heating roll and a pressure roll that are in contact with each other.

BACKGROUND AND TECHNOLOGY The pressure roll in the conventional fixing device is RTV, H
Rubber materials such as Tv1 liquid silicone rubber, fluororubber, and the like coated with a tube of Teflon resin are used. In the above-mentioned pressure roll rubber material, the liquid silicone rubber is supplied from the pressure roll rubber material to the heating roll over a long period of time, for example, for about 100,000 copies, to prevent wear on the surface of the heating roll and to protect both of the rolls. Provides mold releasability.

Problems to be Solved by the Invention The mechanical strength of the liquid silicone rubber material is equivalent to that of RTV at JISA rubber hardness (hereinafter the same) at 40 to 45 degrees, but when the rubber hardness is 20 to 30 degrees. is inferior to RTV, and the internal amount of silicone oil is 5 to 8 PR.
If it is set to 8, it is impossible to use it as a rubber material for pressure rolls due to the lifespan.

Means and Effects for Solving the Problems The present invention has been made in consideration of the above-mentioned problems, and provides a fixing device for an electronic copying machine or the like comprising a heating roll and a pressure roll that are brought into contact with each other under pressure. The pressure roll is made of a core, an inner material that is bonded to the core and made of a soft elastic material such as foamed silicone sponge, silicone rubber, or felt, and is further impregnated with silicone oil, and this inner material is covered with a porous material. The inner material is impregnated with a certain amount of silicone oil from the surface of the covering material by pressure rolling contact with a heating roll, and a fixed amount of silicone oil is applied to the heating roll and image support of copy paper, etc. supplied to the material.

Example Embodiments of the present invention will be described based on the drawings.

In the figure, 1 is a heating roll, and 2 is a pressure roll that is pressed and rolled into contact with the heating roll I. This pressure roll 2 consists of a core 3, an internal material 4, and a covering material 5 covering this internal material 4. The core 3 is made of metal such as iron or aluminum or heat-resistant plastic.

In addition, the internal material 4 is foamed silicone sponge, silicone rubber,
It is made of a soft material with elasticity such as felt,
This impregnation with silicone oil may be performed either before or after adhesion of the inner member 2 to the core 1. The covering material 5 is made of porous fluororesin.

The pressure roll 2 having the above structure is brought into pressure rolling contact with the heating roll 1, so that a certain amount of silicone oil impregnated into the inner material 4 is supplied from the surface of the covering material 50 to the heating roll and the copy paper.

Effects of the Invention According to the present invention, abrasion of the coating layer of the heating roll 1 is prevented, and the surface releasability of the heating roll 1 and the pressure roll 2 is improved, and the release properties of the heating roll 1 and the pressure roll 2 are improved. Toner adhesion is prevented and copy paper stains are prevented.

Further, since the covering material 5 is made of porous fluororesin, there are few scratches or wear caused by the pressure roll peeling claw.

Furthermore, the narrowing of pressure roll diameter caused by partial silicone oil leakage in the paper passing section of the pressure roll, which occurs in HTV, liquid silicone rubber materials, etc., is eliminated, and stable fixing and paper wrinkle prevention performance can be achieved over a long period of time. I can do it.

[Brief explanation of drawings]

The drawings are explanatory diagrams showing embodiments of the present invention. 1 is a heating roll, 2 is a pressure roll, 3 is a core, 4 is an internal material, and 5 is a covering material.

Claims (1)

[Claims] In a fixing device for an electronic copying machine or the like, which is composed of a heating roll 1 and a pressure roll 2 that are brought into pressure rolling contact with each other, the pressure roll 2 is connected to a core 3, and a foamed silicone sponge or silicone It is characterized by being composed of an inner material 4 made of an elastic soft material such as rubber or felt and further impregnated with silicone oil, and a covering material 5 made of porous fluororesin that covers this inner material 4. Fixing device.