JPH063399Y2 - Heat roller fixing device - Google Patents

Description

[Detailed Description of the Invention] [Outline] Prevents poor contact with a contactor, which is connected to a power supply unit and a power source mounted on the end of a heat roller on which a resistor is wound, and thus prevents dust from entering. And a heat roller fixing device in which a cleaning portion is interposed between the cover and the end portion of the heat roller and the power feeding portion.

[Industrial application field]

The present invention relates to a heat roller fixing device for heating and fixing a toner image on a holder.

There is an electrophotographic recording device that forms a toner image on a sheet that is a holder, but this electrophotographic recording device uses a transfer charger to transfer a toner image formed on a photosensitive drum by a developing device. It is only attached to the paper by electrostatic force.

Therefore, in order to permanently attach the toner image on the paper, the toner is melted by heat, pressure, or the like and fixed on the paper.

By the way, as a means for applying this heat, a heat roller device using a halogen lamp as a heat source has been conventionally used, but in recent years, a resistor is wound around the heat roller surface,
Ceramic heat rollers that supply power from both ends have come into use.

[Prior art]

FIG. 2 is a diagram showing a structure of a power feeding portion of a conventional ceramic heat roller.

In the figure, reference numeral 1 denotes a ceramic heat roller, which is wound with a resistor (not shown), and which heats and fixes the toner image on the paper by sandwiching the paper with a pressure roller (not shown). Reference numeral 2 denotes a power feeding portion, which is provided at both ends of the ceramic heat roller 1, and 3 denotes a brush, which is connected to a power source portion (not shown) through a power feeding line 3b and feeds power to the power feeding portion 2 (not shown). The contactor 3a is urged toward the feeding portion 2 by a spring, and 4 is a frame, which supports the ceramic heat roller 1 via a bearing 5.

In the above configuration, the rotation driving mechanism such as a motor (not shown) sandwiches the paper between the pressing roller and the roller to fix the toner image.

[Problems to be solved by the invention]

As shown in FIG. 2, since the brush 3 is arranged at the end portion of the ceramic heat roller, dust, toner, and a ceramic heat roller are applied between the power feeding portion 2 and the brush 3 for cleaning the ceramic heat roller. There has been a problem that a non-conductive substance such as silicone oil enters and causes poor contact.

Therefore, there is a drawback that the heat roller 1 is not sufficiently heated and fixing failure occurs.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a heat roller fixing device that does not cause defective contact between the power supply unit and the brush and does not cause defective fixing.

[Means for solving problems]

According to the present invention, as shown in FIG. 1, the above object has a heat roller (1) and a power feeding part (2) provided at the end thereof, and a brush (3) for feeding power has a contactor (3a). In the configuration in which the brush, the power feeding portion and the end portion of the heat roller are entirely covered with the brush, the cover member (6) is provided to cover the inner surface of the cover member, the upper surface of the end portion of the heat roller and the brush mounting position. This is achieved by a heat roller fixing device characterized in that a cleaning member (7) made of a sponge-like member is interposed between the upper surface of the power feeding portion and the upper surface.

[Action]

That is, the end of the heat roller (1), the power feeding part 2 and the brush 3 are entirely covered with the cover member (6), and between the cover member 6 and the end of the heat roller 1 and the power feeding part. Since the cleaning member 7 is provided, the cleaning member also cleans the abrasion powder caused by the dust, floating toner, and the contact of silicon oil on the surface of the heat roller 1 sliding at the contact position between the power supply unit and the brush. Poor contact between the brush and the power supply is completely prevented.

〔Example〕

FIG. 1 is an explanatory view of an embodiment of a heat roller fixing device according to the present invention, in which FIG. 1 (a) is a side sectional view and FIG. 1 (b) is A in FIG. 1 (a).
FIG.

In the figure, the difference from FIG. 2 is that a dustproof cover member 6 fixed to the frame 4 and a cleaning member 7 between the cover 6 and the end portion of the ceramic heat roller 1 and the power feeding portion other than the brush mounting position. The point is that the power supply line 3b is provided and connected to the power source from the outside of the frame 4. It should be noted that as the cleaning member 7, it is preferable to use a sponge-like member that prevents dust and absorbs silicon oil without causing wear of the heat roller surface.

Further, the cleaning member 7 also cleans the power supply unit 2 as shown in FIG.

As described above, in this embodiment, it is possible to prevent the intrusion of non-conductive substances such as dust, toner, silicon oil 8 and the like into the contact portion between the power feeding unit 2 and the contactor 3a, and to prevent the contactor made of a carbon-based material from It is also possible to prevent the power feeding unit from becoming dirty due to wear.

[Effect of device]

As described above, according to the present invention, it is possible to obtain the heat roller fixing device in which the power supply unit and the contactor do not cause the contact failure and the fixing failure does not occur.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment, and FIG. 2 is an explanatory diagram of a conventional example. In the figure, 1 is a heat roller, 2 is a power feeding portion, 3a is a contact, 6 is a cover member, and 7 is a cleaning member.

Claims (1)

[Scope of utility model registration request] 1. A heat roller (1) and a power feeding part (2) provided at an end thereof, and a brush (3) for feeding power contacts the power feeding part through a contact (3a). In the configuration, a cover member (6) is provided to cover the brush, the power feeding portion and the end portion of the heat roller over the entire surface, and between the inner surface of the cover member and the top surface of the end portion of the heat roller and the top surface of the power feeding portion other than the brush mounting position. The heat roller fixing device is characterized in that a cleaning member (7) made of a sponge-like member is interposed between them.