JPS58111963A - Fixing device - Google Patents

Abstract

PURPOSE:To supply an offset preventive liquid of the minimum required, by providing a tetrafluoroethylene resin film having a lot of fine holes, between the first and the second felt members of an offset preventive liquid applying member, and between the second felt member and a fixing roller. CONSTITUTION:A fixing roll 1 is formed by covering a core bar 2 with a parting, material 3 such as silicone rubber or tetrafluoroethylene resin, etc., and is heated by a halogen lamp 7 of the inside. An offset preventive liquid 14 is absorbed and held by heat-resistance felt 15, 16 and 17 by a capillary phenomenon from an offset preventive liquid storage tank 13. A sheet-like heat-resistance porous member 20 (tetrafluoroethylene resin having a lot of fine closed cells) exists on both the connecting part of the felt 16, 17 and the connecting part to the fixing roll 1. In this way, it can be attained that the application is performed uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixing device for thermally fixing a heat-adhesive powder image on a support material.
A fixing device using a pair of rotating bodies is improved so that a necessary amount of offset prevention liquid is always supplied to the single rotating body in contact with the powder image PIC.

In recent years, electrophotographic copying devices have been exhibiting a trend toward higher speeds. For this reason, heating methods such as infrared heating, hot plate heating, and ribbon heater heating that supply heat through a heat-resistant conductor such as air between heating elements and supporting materials have a very poor thermal efficiency. 〈The device is also showing signs of increasing its size, such as rounding and decreasing frequency of use.〇In place of these, m-Rotz constant fixation, which directly shakes the toner powder image with a heating cloth and fixes it on the powder image supporting material, is used. It has good thermal efficiency and high safety, and the device does not have any wrinkles, so it is used frequently.
It is set to be carried out on the 1st. In conventional heat roller fixed fixing devices, RT V of a type similar to fixing p-2-table improvement
('iii warm vulcanization) Form the material of silicone oil or supply the fixing roller 1 mW offset prevention liquid and K from the support material to the fixing roller 11
It is said to be effective in preventing book offset and supporting material from wrapping around the roller.

The anti-offset properties of M6kRTV silicone rubber P-2 deteriorate over time, and in our nine trials, the surface of the rubber roller was heated to a temperature of approximately 4.
After being used for 00 hours, the anti-offset ability of Rubber G-2 deteriorated to the point that it did not meet the practical requirements.

Therefore, after a certain period of time, it is necessary to replace the rubber roller. Therefore, in high-speed photographing machines, replacement becomes more frequent, which is impractical.

Conventionally, the conventional method for supplying a silicone oil-based anti-offset liquid to the surface of the fixing roller is to bring it into contact with a heat-resistant felt fixing roller impregnated with silicone oil. Coating is moldy, and overcoating can cause slippage between the rollers, silicone oil adheres to the support material, and contaminates the support material, resulting in the texture of the surface of the copy material after copying is completed, and the ink on the support material. Ink compatibility during kneading can cause serious problems.

The object of the present invention is to overcome the above-mentioned conventional drawbacks.

The present invention has a simple structure and is designed to constantly supply i amount of anti-offset liquid to the surface of the fixing roller.

The fixing device of the present invention will be described below using drawings.
I will clarify.

Figure 1 shows one embodiment of the present invention. 1 is a core metal 2 made of a material with good thermal conductivity such as aluminum or copper, and silicone rubber compound (tetrafluoride ethylene l1ll&) etc. The am-resistant material 5 is thinly coated with 9 fixed wax bran, and 4 is the core bar 5.
A relatively thick silicone rubber 6 is coated on top and light pressure is applied! It is an I roller. Both 1.4 parts are pressed against each other with appropriate pressure and rotated in the direction of the arrow. A support material made of paper holding a heat-fusible toner powder image T is fed in the direction of the arrow □K11i, and the fixing roller 1 is pressurized between the rollers 1° and 4, which is an internal heat source. Heated by the heat lamp 7,
A sufficient amount of heat is applied to the contact surface of the pressure roller 4 to melt the #image T. Also, fixing tractor-1
The surface temperature of the tube is always controlled within a constant temperature range by a temperature detection element 9 such as a star. 10#i
Rounding guide 11, 1 for conveying copy material to the roller
2. This is a separation claw to reliably separate the supporting material after fixation, and it is made of heat-resistant arm resin such as Teflon, or #111MI material such as Theazine coating for metals, from seed material source c. ing. ' 16 Offset prevention body 14 is stored in the offset prevention ability storage tank ' Offset prevention liquid 14 capillary shallow formation, Nomex,? 7on 7x ruto l1il
) Resistance @ y engineering tv ) 15th, 16th, 17th Kll collection is maintained. The support plate 18 is supported by the heat-resistant felt) 17tj support 4[18, and can swing around the fulcrum 19.

Reference numeral 20 denotes an elastic porous member having heat resistance to prevent overcoating, a portion of which is fixed to the felt 17 and the other portion of which is in contact with the fixing roller 1. The porous member 20
i Tetrafluoroethylene #4 is made porous and has many independent micropores, with a pore diameter of 0.2 to 5 and a porosity of 4.
Use one with a weight of 5 to 95 yen.

Conventionally, the felt 17 was directly attached to the fixing roller IK! Il!
When supplying oil, for example, during standby, the felt 17 should be placed on the fixing roller 1 to prevent overflow.
Control is performed using a solenoid so that the felt 1F is brought into contact with the fixing roller 1 only temporarily during copying, but this makes the device complicated, causes large wrinkles, and may lead to the loss of heat 1. In the example, by providing a heat-resistant porous member between the felt □ and the fixing roller, it is possible to supply only the minimum amount of oil to the fixing roller with a simple configuration. .

Mori, Maeij W, L, C in the heat-resistant porous member 20
ltORg company (') 8 people, GORii knee TEX J
OINT 5EALANT (tetrafluoroethylene resin porous member; usually referred to as GORE-TI7tX, is a microporous material whose micropores are interlocked with each other and are continuous from the front to the back). Since this porous member is highly flexible, it is possible to uniformly contact the surface of the fixing p-fulle with a slight pressure, and the coefficient of friction is small, so it has good lubricity and almost no wear. do not.

FIG. 2 shows another example in which a plurality of heat-resistant porous members are brought into contact with each other by force. By providing a plurality of them, it becomes more stable and nine applications can be applied. In addition, the figure tic'
Items with similar functions to those in Figure rtpc1 are designated by the same reference numerals below.

Fig. 183 shows another example, in which a thin JI1111i-type 6t-type 8#i on the pressure roller 4 and the metal core 5 is used.
The heat source '020 for heating the pressure roller is a sheet-like heat-resistant porous member made of porous tetrafluoroethylene resin. In this example, the WaS between the connection part of 16.17 and the fixing-1
A porous member is interposed on both sides. This makes it possible to achieve more uniform coating. The thickness of the porous member 20 may be 1- or less.

Figure 4 shows another embodiment, in which the fixing roller 1 is equipped with felt 1.
6 and the heat-resistant porous member 20 are in contact with each other. The excess oil coated with the heat-resistant felt 16 on the surface of the fixing roller 1 cannot pass through the heat-resistant porous member 20, and the excess oil accumulates in the portion 210 shown in the figure, and the roller contacts the supporting material. #! It is possible to always maintain an adequate amount of oil.

Figure 5 shows another embodiment of the present invention, in which the fixing roller 1 is heated from the inside with a halogen rung 7.8. Compared to Lamp 7 Company Lang 8, Lamp 7.
8 is abnormally turned on and off at the same time, but the knee lamp (not shown) such as a halogen lamp is turned on during copying.
, the electrophotographic copying machine can be used with the minimum necessary force by forcibly turning off the lamp 18 (while the lamp 7 is heating normally).

22 is oil on the fixing roller 1! The coating roller is made of silicone rubber and has a Teflon nuclide on its surface. A sufficient amount of silicone oil is retained within the heat-resistant felt 17 due to capillary action within the off-cut prevention liquid storage 111.
A small amount of silicone oil is supplied to the coating roller via the heat-resistant porous member 20, and from the coating roller to the fixing roller, a small amount of silicone oil is applied. Since the amount of ld is extremely small, a good quality product with no support material oil stains after fixing can be obtained. In addition, since a small amount of oil is constantly applied to the fixing roller, it is possible to maintain stable fixing performance over a long period of time without deterioration, and because less oil is consumed, it is possible to significantly reduce costs. It gets cloudy.

In FIG. 5, there is a cleaning felt for cleaning the surface of the pressure roller manufactured by 26, and a guide plate for guiding the supporting material after fixing of 24.25 #i to the paper ejection roller.

As described above, in the present invention, the two parts K of the application member are
Since it is equipped with a molecular material to create multiple M4f continuous pores, it is always a foot roller! ! mK can supply the minimum amount of anti-offset liquid required, allowing stable fixing without any trouble for a long period of time, and can significantly reduce costs due to low consumption of anti-offset liquid. .

[Brief explanation of the drawing]

FIGS. 1, 2, 4, and 5 are schematic diagrams of the fixing device according to the present invention, and FIG. 3 is a detailed explanatory diagram of the present invention. 1... fixing loaf - 4... pressure welding loaf 1
6...-Offset prevention forgiveness savings cypress 15, 16,
17---... Felt 20... Porous member

Claims (1)

[Scope of Claims] (1) A fixing device that fixes a toner image by sandwiching and conveying a toner image support material between a first rotating body and a second rotating body, the fixing device comprising: a first rotating body; Supply circumferential roller for supplying anti-offset liquid to the rolling element, roller of turtle 1 in contact with the rolling element, and offset prevention i for applying anti-offset liquid to the roller for supplying the rolling element , a coating member having the above-mentioned applicator member 111 and the part 2, and having a large number of fine holes between the scissors I11 and the part 2, is provided, and the part II2 and the first rotating body are connected to each other. A fixing device characterized in that an irises 21M resin member having a large number of micropores is provided at the junction of the irises 1 and 2. The fixing device according to claim 1. (3) Upper IEjl 1, !1211j1mll#
41II characterized in that it can be integrated with ti.
ll! 1st section of S Iris by F Kaneki. Fixing device 0 according to any of item 2 (4) Item 1 above. 211ji1 The fixing device 0 according to any one of claims 1111 to 23J, characterized in that the thickness of the first member is 11 or less.