JPH0541996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cleaning blade for a roll fixing device of a copying machine.

(Prior Art) Conventionally, a roll fixing device for a copying machine has a pair of upper and lower heat rolls and a pressure roll, and a toner image transferred to paper from a photoreceptor drum is transferred to the paper by a transfer section for the toner image from the photoreceptor drum. was configured to be fixed by applying heat and pressure. As shown in FIG.
A metering blade 2, a cleaning blade 3 made of elastic rubber, etc. are arranged. Further, on the surface of the heat roll 4, there is arranged means for supplying silicone oil or the like as a release agent for the paper using the oil supply wick 1, and for uniformizing this oil using the metering blade 2. The toner and carrier that adhere to the surface of the heat roll 4 during the fixing of the oil and the paper are scraped off and cleaned by a cleaning blade 3.

However, during this cleaning, if the edge of the metering blade 2 is damaged or worn and the amount of oil supplied to the heat roll 4 is too large, the oil is cleaned by the cleaning blade 3. In some cases, there is a problem in that it accumulates in the area in front of the cleaning blade. Then, while the heat roll 4 is not rotating, the oil accumulated in the blade flows out from one side of the blade 3 and stains the copy paper.
Another disadvantage is that the fixing device becomes dirty.

In order to avoid the above-mentioned problems, it is conceivable to form oil passage holes in the elastic rubber material of the cleaning blade. However, when such a method is used, when the blade is pressed against the heat roll, the passage hole makes it impossible to apply a uniform pressing action, and the cleaning blade performance is reduced. It was hot.

(Object of the Invention) The present invention has been made to eliminate the drawbacks of the conventional cleaning blade described above, and is to reduce the original function of the cleaning blade for cleaning the surface of the heat roll when cleaning the surface of the heat roll. A cleaning method for a roll fixing device in which the release agent such as silicone oil that tends to accumulate in front of the blade is removed one after another, thereby preventing stains on copy paper and the fixing device caused by the release agent. The purpose is to provide blades.

(Structure of the Invention) In order to solve the above-mentioned problem, the present invention provides a passage hole penetrating through the elastic rubber material constituting the cleaning blade and the blade support member supporting the elastic rubber material at appropriate locations. The mold release agent that tends to accumulate in front of the cleaning blade is removed through the passage hole.

(Example) The present invention will be described in detail below based on an example shown in the drawings. FIG. 2 is a perspective view showing an embodiment of the cleaning blade of the present invention, and FIG. 3 is a sectional view of FIG. 2. The upper end of the elastic rubber blade 5 provided in a rectangular shape is inserted into the groove 7 of the blade support member 6 made of metal or the like to make it integral, and the groove of the blade support member 6 is inserted into the groove 7 of the blade support member 6. Passage holes 8 passing through the elastic blade 5 are bored at appropriate positions of the elastic blade 7. Slanted portions 9 and 9' are provided on both sides of the support member 6 toward the surface of the elastic rubber blade 5.

The present invention is constructed as described above, and its usage will now be explained. The lower end of the elastic rubber blade 5 is placed in pressure contact with the surface of the heat roll 10, as shown in FIG. Further, the provision of a mechanism for supplying oil by the oil supply wick 12 and a means for equalizing oil by the metering blade 11 is configured in the same manner as in the case of the conventional apparatus. At the position where the elastic rubber blade 5 is pressed, toner, carrier, and release agent such as silicone oil adhering to the surface of the heat roll 10 are cleaned in the same manner as in the conventional apparatus.

However, the edge of the metering blade 11 is damaged or worn, making it impossible to uniformize the release agent supplied from the oil supply wick 12, and the oil supply to the surface of the heat roll 10 becomes impossible. When there are too many holes, the passage holes become effective. In other words,
The release agent is transferred to the heat roll 10 along with the toner and carrier by the elastic rubber blade 5.
By being scraped off from the surface of the blade 5, it tends to accumulate in front of the blade 5.

On the other hand, in the apparatus of the present invention, the mold release agent scraped off by the blade passes through the passage holes 8 provided in the blade support member 6, from the upstream side in the rotational direction of the roll of the elastic rubber blade. It is returned to the oil supply wick 12. Therefore, the oil accumulated on the upper surface of the blade can be kept below a certain level at all times, and excessive accumulated oil can be prevented from overflowing to the side and staining the fixing device.

The present invention is constructed and used as described above, and includes a blade that supports the elastic rubber blade 5 of the cleaning blade disposed on one outer periphery of the heat roll 10 while being inserted into the groove in order to clean the surface of the heat roll 10. A mold release agent passage hole 8 is provided at a suitable location in the support member 6 and passes through the elastic rubber blade and the support member.
The mechanism can be simplified by simply drilling and providing...

When cleaning the heat roll 10, the release agent that tends to accumulate in front of the elastic rubber blade 5 is transferred from the front of the blade 5 through the passage holes 8 to the oil supply wick 12 behind it. As a result, no oil pool is formed in front of the blade. Therefore, the mold release agent flows out from the sides of the plate, and
This prevents the copy paper and fixing device from getting dirty. Furthermore, since the release agent passage holes 8 are formed in the blade support member 6, when the exposed portion of the elastic rubber blade 5 is pressed against the heat roll 10, the pressure is uniform, and the blade 5
The cleaning ability of the heat roll 10 can be exhibited in a good condition. In addition to the above configuration, the lower end of the blade support member 6 includes inclined portions 9, 9'.
Since the mold release agent scraped off from the roll surface is guided toward the passage holes 8 and can be easily flowed out through the through holes, the function of the cleaning blade is further improved. be able to.

(Effects of the Invention) Since the present invention has the above-described configuration, the cleaning blade for cleaning the surface of the heat roll is supported by the blade support member, and the elastic rubber blade and the support member are penetrated. The mechanism can be simplified because only a hole is provided. When cleaning the heat roll, excess mold release agent scraped off by the elastic rubber blade can be sequentially discharged through the passage hole, thereby preventing oil from accumulating in front of the blade. This can prevent the release agent from flowing out from the side of the blade and staining the copy paper or the fixing device. Furthermore, since the release agent passage holes are formed in the blade support member, when the elastic rubber blade is pressed against the heat roll, the pressure is uniform, and the blade can effectively perform cleaning of the heat roll. can be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic layout diagram showing the installation state of a conventional cleaning blade, Fig. 2 is a perspective view showing an embodiment of the cleaning blade of the present invention, Fig. 3 is a sectional view of Fig. 2, and Fig. 4 is a FIG. 3 is a schematic layout diagram showing the attached state of FIG. 2; In the figure, 5...elastic rubber blade, 6...blade support member, 7...concave groove, 8...passing hole, 9, 9'...inclined part, 10...heat roll, 11...metering blade, 12...oil supply wick.

Claims (1)

[Scope of Claims] 1. A fixing device in which a recording sheet on which an unfixed toner image has been formed is passed between a pair of upper and lower heat rolls and a pressure roll to apply pressure and heat to fix the image, comprising: A cleaning blade for cleaning the surface of the heat roll is disposed at a position linearly pressed against a part of the outer periphery of the heat roll, the cleaning blade is configured as a plate-like member formed of an elastic body, and the cleaning blade is configured as a plate-like member formed of an elastic material, The base is mounted and held in a groove of a blade support member, and the upper and lower surfaces of the blade support member are configured with surfaces that are inclined toward the blade, and a hole is provided that passes through the blade support member and the base of the blade. 1. A cleaning blade for a roll fixing device, characterized in that a plurality of cleaning blades are arranged parallel to an axis of a heat roll, and constitute a mechanism for passing a release agent scraped off from the heat roll.