JPH0455877A - Oil applying device for fixing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a fixing device comprising a fixing roller and a pressure roller that are in pressure contact with each other, and in which the fixing roller is brought into contact with an oil coating member impregnated with offset prevention oil. Regarding.

[Conventional technology]

2. Description of the Related Art In image forming apparatuses such as copying machines, facsimile machines, and printers, a transfer sheet carrying a toner image is passed between a fixing roller and a pressure roller that are pressed against each other to fix the toner image.

In this case, offset of the toner in the toner image onto the fixing roller is unavoidable, and in order to prevent this offset, it is well known that an oil coating member impregnated with offset prevention oil is brought into contact with the fixing roller. Furthermore,
In order to clean the surface of the fixing roller, it has already been proposed to provide a cleaning member separate from the oil application member or to have the oil application member also have a cleaning function.

[Problem to be solved by the invention]

If the cleaning member is arranged separately from the oil applying member, a configuration for arranging the cleaning member is required.
The disadvantage is that the configuration is complicated. Furthermore, in the case where the oil application member also has a cleaning function, impurities such as toner and paper dust adhere to the oil application member, which reduces the oil application ability.

The present invention aims to eliminate the above-mentioned conventional drawbacks.

[Means to solve the problem]

According to the present invention, the above problem is solved by providing means for applying a load to the oil application member at two or more locations to press it against the fixing roller.

[For production]

The oil applying member according to the present invention performs a cleaning action of impurities such as toner and paper dust on the surface of the fixing roller at the first load position, thereby cleaning the oil application member at the first load position downstream of the first load position in the rotational direction of the fixing roller. 2 Prevents the adhesion of impurities such as toner and paper dust at the load position and maintains good oil application performance at this position.

〔Example〕

In FIG. 1, a fixing roller 1 and a pressure roller 2 are arranged so as to be in pressure contact with each other and rotate in the direction of the arrow. 3 is a heater. A transfer paper 5 carrying a toner image 4 is passed between a fixing roller 1 and a pressure roller 2 via a guide plate 6, and after the toner image is fixed on this 1, it is sent to the outside of the machine via a pair of discharge rollers 7. Ejected to the tray. 8 is a separation claw; 9
is an oil application device constructed according to the present invention. below,
This oil application device will be explained with reference to FIG.

In FIG. 2, an oil application member 1 made of felt material
One end of the 0 is folded and contacts the fixing roller 1, and the other end is immersed in offset prevention oil 12 such as silicone oil placed in an oil tank 11. A contact portion 10a of the oil application member 1o with the fixing roller 1 is pressed against the fixing roller 1 by a leaf spring 13. in this case,
The contact portion 10a is strongly pressed by the leaf spring 13 at two locations: a first load position P1 at the tip of the oil application member 10 and a second load position IP2 downstream in the rotational direction of the fixing roller 1. 14 is a support plate of the leaf spring 13, and 15 is a second cleaning member.

In the second @ oil application device 9, the oil tank 11
The silicone oil inside penetrates into the oil application member 10 by capillary action, reaches the contact portion 10a, and is applied to the surface of the fixing roller 1 at this contact portion. In that case, impurities such as toner and paper powder adhering to the surface of the fixing roller 1
As the fixing roller rotates, the first part of the oil application member 10 is
It is dammed at load position PX and deposited there. Therefore, the portion at the second load position P2 is not contaminated with impurities such as toner, and good oil application performance can be maintained. The toner that is not captured by the contact portion 10a but has passed through the second cleaning member 15 is captured by the second cleaning member 15.

〔Effect of the invention〕

According to the present invention, a single oil application member first performs a cleaning action to remove impurities such as toner, and then performs the original oil application action, so that impurities such as toner and paper dust are deposited at the oil application position. It is possible to maintain good toner application performance without any problems, and the configuration for this purpose is simple.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a fixing device according to the present invention, and FIG. 2 is an enlarged explanatory diagram of its oil application device. 1... Fixing roller 2... Pressure roller 9... Oil coating device 10... Oil coating member 13... Leaf spring Pl... First load position P2... Second load position

Claims (1)

[Claims] In a fixing device that includes a fixing roller and a pressure roller that are in pressure contact with each other, and in which the fixing roller is brought into contact with an oil coating member impregnated with offset prevention oil, a load is applied to the oil coating member at two or more places to press the oil coating member against the fixing roller. An oil application device characterized by being provided with a means for applying the oil.