JPS6015664A - Fixing device with heat roller - Google Patents

Abstract

PURPOSE:To provide a reduction in warming-up time, a decrease in the axial temp. difference of a heating roller and a prevention of bearing heating by providing partition members between the heating roller and a heat generating pipe. CONSTITUTION:There is >=3mm. clearance between the inside diameter of a roller body 1 which is supported by bearings 2 and is further attached with a gear 3 and the outside diameter of a halogen tube heater 4 even in the open port parts at both end sides of the body 1 where the outside diameter is reduced. Partition members 5 which narrow or close the spacing are provided by fitting the members onto the outside diameter of the heater 4 or fitting the same into the bone in the open ports on both end sides of the body 1. The members 5 are provided by using supplementarily stoppers 6 for the outside diameter of the heater 4 or may be fitted into the bore of the body 1. The members 5 are formed of metals, ceramics, asbestos, glass fibers, heat-resistant rubber and other suitable heat-resistant materials.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to an improved Kr1AL of a heat roller fixing device of a recording device such as an electrophotographic copying machine. The present invention relates to an improvement of a heating roller of a fixing device using a built-in heating roller with a heating tube inserted through the opening.

[Prior art]

Conventional heat roller fixing devices have a simple structure, easy maintenance, small heat capacity, easy temperature control, and relatively long lifespan. A built-in heating roller is often used. However, a recording apparatus using such a heat roller fixing device still has problems in that it takes time to warm up the heat roller fixing device, and the internal temperature of the recording device tends to rise.

[Purpose of the invention]

The present invention has been made in order to shorten the warming-up time of a heat roller fixing device using a heat roller as described above, and to prevent an increase in the internal temperature of a recording device. This was done after discovering that the gap between the heating tube and the heat generating tube inserted therein, which is more than three degrees, has a large effect on the warming-up time and the rise in internal temperature of the machine.

[Structure of the invention]

The present invention provides a fixing device for a recording device using a heating roller that is open at least one shaft end side and has a fixed heat generating tube inserted through the opening. Alternatively, there is provided a heat roller fixing device comprising a partition member that is held in engagement with the inner diameter of the heat roller to narrow or close the gap between the heat roller and the heat generating tube at the opening. This configuration achieves the objectives of shortening the warming-up time and preventing the temperature inside the machine from rising.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated examples.

FIG. 1 is a sectional view showing an example of the heating roller used in the heating roller fixing device of the present invention, and FIG. 2 is a partial sectional view showing another example of the heating roller.

In the figure, 1 is a roller body, 2 is a bearing that rotatably supports the roller body 1, 3 is a gear that rotates the roller body 1,
4 is a halogen tube heater which has electrodes at both ends, passes through the roller body 1, and is held in the fixing device frame by a socket (not shown), and the configuration up to the reel and column is the same as that of a conventional heating roller. .

Even in the open portions at both ends of the roller body 1, which is supported by the bearing 2 or further has the gear 3 attached thereto, the outer diameter of the roller body 1 is reduced, and there is a distance of 3. In the present invention, a partition member 5 is provided to narrow or close the gap by fitting into the outer diameter of the halogen tube heater 4 or the inner diameter of the openings on both ends of the roller body 1. That's what I do.

The partition member 5 shown in FIG. 1 is fitted onto the outer diameter of the halogen tube heater 4, and has a stopper 6 to prevent it from moving in the axial direction.
It is used supplementarily. Furthermore, the partition member 5 shown in FIG.
It is held in The partition member 5 is made of metal, ceramic, asbestos, glass wool, heat-resistant rubber, or other suitable heat-resistant material, and the distal end opposite to the inner diameter or outer diameter of the partition member 5 is connected to the roller body 1. It may be slightly separated from the inner diameter or outer diameter of the halogen tube heater 4, or it may be in slight sliding contact with the inner diameter or outer diameter of the halogen tube heater 4. The stopper 6, which is used as necessary, is also formed of a trap such as metal or heat-resistant rubber. In addition to the illustrated example, the roller body 1 may have the same inner and outer diameters as the central portion up to the openings at both ends, or may have other shapes.

〔Effect of the invention〕

As described above, the present invention provides a simple means of providing a partition member that is engaged with and held by the inner diameter of the heating roller or the outer diameter of the heating tube to narrow or close the gap between the heating roller and the heating tube. This significantly shortens the warming-up time of the heating roller, that is, the heating roller fixing device, reduces the temperature difference in the axial direction of the heating roller, prevents overheating of the bearing, extends its life, and prevents the temperature inside the machine from rising. This has the excellent effect of reducing power consumption.

Note that the present invention is not limited to the example using a halogen tube heater, but may also use an infrared tube heater or a sheathed heater, and the heating roller may have an opening at only one end. It's okay.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a heating port used in the heat roller fixing device of the present invention, and FIG. 2 is a partial cross-sectional view showing another example of the heating roller. 1...Roller body, 2...Bearing, 3...Gear,
4...Halogen tube heater, 5-...Partition member,
6...stop. Patent applicant Konishiroku Photo Industry Co., Ltd.

Claims (1)

[Claims] In a fixing device of a recording device using a heating roller that is open at least on one shaft end side and has a built-in fixed heat generating tube inserted through the opening, the outer diameter of the heat generating tube or the diameter of the heating roller is A heat roller fixing device characterized in that a partition member is provided which is held in engagement with the inner diameter to narrow or close a gap between the heat roller and the heat generating tube in the opening.