JPH0215072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a toner image fixing device, and more specifically, it has a heat roller that comes into contact with the toner image adhesion surface of a recording paper, and a cleaning roller whose surface is made of fiber is attached to the heat roller. The present invention relates to an improvement in a cleaning roller of a toner image fixing device that comes in contact with the cleaning roller.

As the cleaning roller of the above-described toner image fixing device, there are known cleaning rollers having a felt-like paper cloth or knitted fabric affixed to the surface thereof, or ones having brushes extending in the radial direction. However, all of them have the problem that the surface fibers are easily stained with toner and have poor durability. In addition, in order to solve this problem, if the surface fibers are impregnated with a mold release agent, the mold release agent will fall off relatively quickly and cause clogging with felt-like paper cloth or knitted fabrics. , sufficient improvement in durability cannot be obtained. Furthermore, in cases where felt-like paper cloth is attached, fibers are also observed to fall off.

The present invention was made based on the discovery that when a releasing agent is applied to the brush of a cleaning roller having brushes, toner stains are reduced and durability is significantly improved.

In the toner image fixing device of the present invention, a release agent is applied to a brush provided with heat-resistant fibers on the surface thereof, and the fixing device is rotated so that the brush is brought into contact with the toner image-attached side of recording paper. It is characterized in that it is configured to be rotated while being in contact with the surface of the heat roller.

Hereinafter, the present invention will be explained with reference to the drawings.

The figure is a schematic sectional view showing an example of the toner image fixing device of the present invention, in which 1 is a heat roller whose surface is heated by a built-in heating lamp 1a, and 2 is a cleaning roller having a brush 2a extending in the radial direction on the surface. , the pressure roller 3 comes into pressure contact with the heat roller 1 due to spring bias. Then, the recording paper P fed into the toner image fixing device by the conveyance device 4 is caught between the heat roller 1 and the pressure roller 3 with the surface to which the toner image T is attached facing the heat roller 1 side. , by the rotation of both rollers in the direction of the arrow. As a result, the toner image T on the recording paper P
is fixed to the recording paper P mainly due to the heat of the heat roller 1. At that time, toner may adhere to the surface of the heat roller 1, but the attached toner is removed by the cleaning roller 2 rotating in the direction of the arrow as the brush 2a contacts the surface of the heat roller 1. be done.

The brush 2a of the cleaning roller 2 is made of heat-resistant fibers such as aromatic nylon fibers and polytetrafluoroethylene fibers, in order not to damage the surface of the heat roller 1 and to have heat resistance and abrasion resistance. is preferably used, and the pile length is 1 to 6 depending on the thickness of the fiber.
A range of 2 to 3 mm is used, and a range of 2 to 3 mm is particularly suitable from the viewpoint of toner removal effect.

Such a brush 2a of the cleaning roller 2
For example, the viscosity ranges from 10 to 100000cs, preferably
By applying silicone oil in the range of 1,000 to 50,000 cs as a release agent, an excellent effect can be obtained in that the toner adhering to the heat roller 1 can be effectively removed without staining the brush 2a forever.

Note that 5 and 6 in the figure indicate the heat roller 1 of the recording paper P;
The recording paper P is prevented from wrapping around the pressure roller 3.
In the illustrated example, the toner removed by the brush 2a of the cleaning roller 2 is removed from the top side of the guide blade 5, the mounting bracket of the guide blade 5, or the cover of the toner fixing device. It does not adhere or accumulate on the inner surface of the case or the like and adversely affect the fixing of the toner image T.

The present invention is not limited to the above-mentioned example, but may also include a plate that allows the recording paper P to slide instead of the pressure roller 3, or a process that provides a similar effect using a release agent other than silicone oil. It does not use any agents.

[Brief explanation of drawings]

The figure is a schematic sectional view showing an example of the toner image fixing device of the present invention. 1... Heat roller, 2... Cleaning roller, 2a
...brush, P...recording paper, T...toner image.

Claims (1)

[Claims] 1 A release agent is applied to a brush whose surface is provided with heat-resistant fibers, and the brush is rotated while being in contact with the surface of a rotating heat roller of a fixing device that is provided in contact with the toner image-attached side of recording paper. A toner image fixing device characterized in that it is configured to