JPS6097374A - Fixing device - Google Patents

Abstract

PURPOSE:To apply oil uniformly to a fixing roll and control easily flowing-out of oil by pressing an oil storage vessel, where a porous elastic member is set to the bottom part, to a heat roll from the top of the heat roll to the upstream side in the rotation direction. CONSTITUTION:When an oil applying means 13 where a porous elastic member 16 is set to the bottom part of an oil storage vessel 14 is pressed to a heat roll 6, the roll 6 is much deformed in the upstream side in the rotation direction because a radius (r) of the elastic member 16 is smaller than a radius R of the roll 6, and pores of the elastic member 16 are closed, and silicone oil in not flowed out at all. Since the elastic member 16 is arranged from the top of the roll 6 to the upstream side, oil is not flowed out when the roll 6 stops rotating, and application defects due to clogging are prevented when the roll 6 is rotated because the part where pores are closed by compressive deformation functions as a blade to remove dust. Consequently, oil is applied uniformly and is economized, and dirt of the device and the bottom is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention can be used for electrophotographic reproduction.
This is related to the 4th edition.

Conventional Structure and Problems In order to prevent the A offset of the developer or to improve the peelability of the paper, oil is applied to the fixing roller. Various types of devices are conventionally known for applying this oil. For example, as shown in FIG. 1, when a roller 1 rotates, it is stretched in the direction of rotation due to its frictional force, increasing the oil passage. There is an oil tank 3 in which the porous elastic body is controlled so that the oil permeability decreases when the rotation stops and resumes. The control film 2 shown in FIG. 1 is formed so that its thickness decreases as it moves forward in the rotation of the roller. (However, it has the drawback that the control membrane 2 is clogged with condensation and the like, which obstructs oil application.) There is also a known device shown in FIG. - A coated part 44/I of porous plus deck material Fl in contact with the roller 1 is formed substantially on the sheet, an oil tank 5 containing mail is arranged on this, and the silicone is applied to the roller 1 through the coating member 4. Although this is a device for applying oil, it has the drawback that it is difficult to control the outflow of oil when the l-ra 1 is stopped.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional drawbacks and to provide a fixing device that can uniformly apply silicone oil to a fixing roller and can easily control oil outflow.

Structure of the Invention In order to achieve the above-mentioned object, the fixing device of the present invention includes a pair of heating rollers and a pressure roller rotating in pressure contact with each other, and a lower end disposed on the bottom of the roller. It comprises an oil storage container in which an oil supply hole is formed, and a porous elastic member provided at the bottom of the oil storage container, and the porous elastic member is inserted from the top of the one O-ra in the rotational direction of the roller. The oil storage container is disposed at an upstream position, and the porous elastic member is placed on the surface of the one roller so that the hole on the upstream side in the O-ra rotation direction of the porous elastic member is closed. It is placed in pressure contact with the

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

First, in Fig. 3, reference numeral 6 denotes a heating roller (fixed roller), which has a core metal 7 and a resin film 8 with anti-offset properties that covers the outer surface of the core bar 7, and a resin film 8 that covers the outer surface thereof, and has a surface humidity of 1 to a humidity that can melt the toner. Heater 9 and 4. Reference numeral 10 denotes a pressure roller which presses the I-ner image support P between 11 and the heat roller 6, and the core roller 11 is coated with a heat-resistant elastic material 12 such as silicone rubber.

The heating roller 6 and pressure roller 10 should rotate in the direction of the arrow.
1- No. 1 as a support 1) Fix in the soil. 1:1 is as follows.
Heating O-ra 6 with A-il coating means C described in detail in .
” It is set in [nore °C].

The oil application means 13 will be explained based on FIG.
Then, 14 is a rigid mail storage container, and a hole 15 is opened in the bottom of the container 15, through which oil is supplied to the porous elastic member 16. This hole 151J^ diameter is several M
There are a large number of them in the axial direction of the O-L, and they are formed so that a sufficient amount of oil can be supplied.

The porous elastic member 1G is bonded to the lower part of the oil storage container 14, and allows silicone oil to pass from the front surface to the back surface. Furthermore, since the porous elastic member 16 is an elastic body, it can be deformed by applying pressure, and in the present invention, this property is utilized to collapse some of the pores inside the porous elastic member as shown in FIG. It is designed to close the oil passage.

In FIG. 4, the oil applying means 13, which initially had the shape shown in FIG. In this case, the radius r of the porous elastic member 16 is smaller than the radius R of the roller 6.
is smaller, the upstream side is deformed more than the downstream side with respect to the rotating direction of the roller 6, and oil flows out from the downstream side, but the upstream side is deformed more than the downstream side. Because it collapses, little or no oil leaks out. The oil applying means 13 is disposed so that the porous elastic member 16 is at a position 1 [l] upstream in the rotational direction of the roller 6 from the old center of the 0-ra 6.

Therefore, when the rotation of the roller 6 stops, the oil flowing out from the downstream side in the direction of rotation collects between the porous elastic member 1G and the roller 6 and does not spill out. Also, during rotation, the part where the holes are crushed due to compression deformation acts like a blade, and removes dirt that causes clogging such as offset toner, so oil is applied due to clogging. Defects can be prevented.

Incidentally, in the above embodiment, the bottom of the oil storage container 14 is inclined so as to approach the roller surface as it goes upstream in the rotational direction of the roller 6, and the porous elastic member 16 on the first flow side is contracted to the roller 6 surface. Although the structure is such that the hole in this portion is closed by contact, the present invention is not limited to this structure. Similar effects can be obtained even if the upstream side is made thicker and pressed against the O-96 surface.

Effects of the Invention As described above, according to the present invention, silicone oil can be uniformly applied without clogging when the roller rotates due to the simple structure, and when the roller stops, the oil can be applied without separating the mail storage container. It is possible to control the outflow of silicone oil, save on silicone oil, and prevent stains on the fixing device and paper.

[Brief explanation of drawings]

Figures 1 and 2 are enlarged cross-sectional views of the main parts of the conventional example;
5 to 5 show an embodiment of the present invention, FIG. 3 is a schematic sectional view of the fixing device, FIGS. 4a and 4b are enlarged sectional views of main parts for explaining the operation, and FIG. FIG. 3 is a cross-sectional view schematically showing the reduction of holes due to compressive deformation. 6...Heating roller, 10...Additional ff, D-ra, 1
3... A oil application means, 14... Oil storage container,
15... Hole, 1G... Poroelastic member representative Yoshihiro Morimoto Figure 1 Figure 3

Claims (1)

[Scope of Claims] 1. A pair of heating rollers and pressure rollers that rotate and press against each other, an oil storage container disposed on one of the rollers and having an oil supply hole formed at the lower end, and the oil storage container. a porous elastic member provided at a lower part, and the oil storage container is arranged so that the porous elastic member is located upstream in the rotational direction of the O-ra from the one roller corner, and A fixing station in which a porous elastic member is disposed in pressure contact with the one O-R surface so that the hole on the upstream side in the L1-R rotational direction of the porous R1 elastic member is closed. 2. Tilt the oil container so that the bottom of the oil storage container approaches the flow side surface in the direction of roller rotation. Fixing device 0 according to claim 1