JPH0424635Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a heater lamp support structure used in a heat roller type fixing device of an electrophotographic copying machine or the like.

[Background of the idea]

As shown in FIG. 3, a conventional heat roller type fixing device includes a paper running section 10 of an appropriate length and a pair of support frames 70 and 80 that are parallel to each other on both sides of the paper running section 10. A plurality of heater lamps 3 are installed in a cylindrical roller body 20 made of aluminum.
0 and connected to said support frame.
The heater lamp 30 is supported through the hole provided in the support frame 20 by insulators 50 and 60 made of a heat insulating material, and a bearing 90 is inserted between the support frame and the support frame.
The roller body is made rotatable by using gears 160, 165 and shaft 40 which are interlocked with the drive shaft 150 of the power source 140 via 100, 110.

The heater lamp 30 has contacts 170 at both ends,
180 are brought into contact with the power supply contacts 230 and 240, respectively, and a current is supplied to the heater lamp from a power source (not shown), so that the surface temperature of the paper running section 10 of the roller body 20 is always maintained at the optimum temperature for fixing. It is configured to maintain The guide is provided to efficiently transfer the heat of the heater lamp to the roller body without leaking to the side surface.
0, and if anything interferes with this, the lamp may be destroyed, so the guide has a hole that is considerably larger than the outside diameter of the heater lamp.

In the fixing device having such a configuration, when replacing the heater lamp 30, the heater lamp 30 is inserted into the insulator 60 on the opposite side through the hole of the guide 120, and inserted into the recess 190 of the insulator 50, and at the same time, the insulator 50 is replaced with the support frame. However, due to play between the hole of the guide 120 and the outer diameter of the heater lamp 30, the end may drop and, depending on the assembly method, ride on the surface of the insulator 50 other than the recess 190, causing the heater lamp 30 to fall. The disadvantage is that the end may break or the contact between the end of the heater lamp 30 and the contact point 170 of the recess 190 may become uncertain, resulting in poor contact, and a lot of time is wasted on the work. It was hot.

[Purpose of invention]

It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art, to quickly and easily replace a heater lamp, and to eliminate contact failures of the contacts of the heater lamp to ensure power supply.

[Summary of the idea]

In the present invention, when replacing the heater lamp placed inside the roller body, it is first necessary for the tip of the heater lamp to easily enter the recess of the insulator. Focusing on the need to absorb misalignment, warping of the heater lamp itself, and backlash between the guide and heater lamp, we made the hole in the guide through which the heater lamp passes as small as possible by following the outer diameter of the heater lamp, and This device is designed to provide a tapered guide portion in the recess of the support portion of the heater lamp to absorb the play.

[Example of idea]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In FIGS. 1 and 2, insulators 50 and 6 support the heater lamp 30 at both ends.
Contact points 170, 180 in recesses 190, 200 of 0
The guide 125 has a hole 250 that is just as large as the outer diameter of the protrusion 260 of the heater lamp 30, and the guide 125 has a hole 250 that is as large as the outer diameter of the protrusion 260 of the heater lamp 30. The tapered portions 210 and 220 are recessed 19 so as to absorb the warp, the heater lamp 30 and the guide 125.
The shape is set at the entrance of 0.200.

Next, the usage status will be explained. Now, assume that the heater lamp 30 disposed within the roller body 20 has deteriorated and needs to be replaced. At this time, the operator removes the insulator 50 from the support frame 70 and moves the deteriorated heater lamp 30 to the guide 125.
A new heater lamp 30 was extracted from the original and replaced with a new one.
Load. At this time, the heater lamp 30 is securely inserted into the tapered portion 220 of the insulator 60 while being supported substantially horizontally in the hole 250 of the guide 125.
After that, it is sufficient to fix the insulator 50 to the support frame, and at this time, the insulators 50 and 60 have tapered portions 210,
220, it is possible to securely hold the end of the heater lamp 30 without tilting or breaking it with respect to the contact 170 of the recess 190.

In the above embodiment, the shapes of the tapered parts of the insulators 50 and 60 are arranged in several stages as shown in FIG.
The same effect can be obtained by holding the end of the heater lamp and using a portion having an inner diameter slightly larger than the outer diameter of the heater lamp to reduce play between the end and the outer diameter of the heater lamp.

[Effect of idea]

As described above, according to the present invention, the heater lamp 3
A hole 230 of the same size as the outer diameter of the protrusion 260 of 0 is provided in the guide 125, and a hole 230 is provided in the guide 125, which is the same size as the outer diameter of the protrusion 260 of the heater lamp 30.
Since the insulators 50 and 60 are provided with tapered portions 210 and 220 having appropriate angles and diameters that can absorb the misalignment of the axis of This prevents poor contact between the contact 170 of the hole 190 and the heater lamp 3.
0 can be ensured, and the time required to replace the heater lamp can also be shortened, which is very effective.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a heater lamp according to an embodiment of the heater lamp support insulator of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a longitudinal cross-section of a conventional heat roller. FIG. 4 is a longitudinal sectional view showing a modification of the present invention. In the figure, 20 is a roller body, 30 is a heater lamp, 50 and 60 are insulators, and 7
0, 80 is a support frame, 120 is a guide, 17
0,180 is a contact point, 190,200 is a recess, 2
10, 220 are tapered parts, 230, 240 are power supply contacts, 250 are holes, 260 are hollow parts, 270
280 is an insulator, and 280 is a tapered portion.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical roller body rotatably supported by a frame, a heater lamp disposed inside the roller body and provided with contacts at both ends, and a contact point of the heater lamp. a guide disposed inside and having a hole slightly larger than the outer circumferential shape along the outer circumferential shape of the cross section of the heater lamp; and a tapered portion at a portion that is attached to the frame and supports both ends of the heater lamp. A heater lamp support structure for a fixing device, comprising: an insulator having a recess; and a power supply contact provided at the bottom of the recess of the insulator. 2. The heater lamp support structure for a fixing device according to claim 1, wherein the insulator is a heat insulating member.