JPH075493Y2 - Heating device support member for image forming apparatus - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating device supporting member of an image forming apparatus such as a copying machine or a printer.

2. Description of the Related Art In an image forming apparatus, for example, a fixing device that fixes an unfixed toner image of a copying machine onto a transfer material using a pair of rollers, a heating unit that heats the roller and a surface of the roller are controlled to a constant temperature. Further, a control device for controlling the electric power of the heating means is provided, and as the heating means, for example, a halogen heater 51 as shown in FIG. 3 is used. In FIG. 3, 52 is a valve, 53 is a filament, 54 is a supporter, 55 is an internal lead, 56 is a molybdenum foil, 57 is an external lead bar, 58 is a contact,
59 is a base and 60 is a chip.

A halogen heater as a heating unit is built in the fixing roller, heats the roller, and the unfixed toner image is fixed on the transfer material by the heat and the pressure of the pair of rollers.

The halogen heater 51 is controlled in electric power to keep the temperature of the roller surface constant. Therefore, the halogen heater 51 is connected to the power supply via the control device. At this time, the halogen heater 51 as a heating means is supported by a machine frame 61 as shown in FIG.
A conductive member 63 is supported by a holder 62 fixed to the holder 62. The conductive member 63 is connected to a control device via a lead wire 64 and is pressed against a contact 58 of a halogen heater 51.

The halogen heater 51 is subjected to both mechanical support and electrical connection by the pressing force of the conductive member 63.

In supporting such a conventional heating device, the conductive member 63 is pressed into contact with the heater 51 due to its elasticity. Easy to cause defects. For this reason, there is a drawback in that the heater does not illuminate or seizure occurs at the contact of the terminal.

In order to eliminate the contact failure, it is also proposed that the lead wire 64 is directly extended from the terminal of the heater as shown in FIG. 5, and the holder 62 'is used only for mechanically supporting the terminal of the heater. There is. In this case, a metal member, that is, a conductive member is usually used for the holder 62 'in terms of heat resistance and rigidity.

The terminal of the heater, for example the base 59 of the halogen heater 51,
Generally, a ceramic or ceramic-based material, as disclosed in a microfilm photographed of the contents and drawings attached to the application of Japanese Utility Model Application No. 54-96939 (Japanese Utility Model Application Laid-Open No. 56-16160) Is used. Although this material is superior in heat resistance to resins and the like, it also has the drawback of high hygroscopicity. Therefore, in a high-humidity environment, moisture absorption may cause the terminals to have poor insulation.

Purpose The present invention solves the above conventional problems, does not cause poor contact or insulation failure in high humidity environment, and is easy to install.
An object of the present invention is to provide a heating device support member having high impact resistance.

In order to achieve the above-mentioned object, according to the present invention, in the support member, a non-conductive gripping portion formed of a low hygroscopic resin surrounding an electric terminal portion formed of a highly heat-resistant ceramic-based material. And a conductive holder portion surrounding the grip portion are integrally formed, and a cutout portion is provided in the integrally formed body.

The details of the structure and operation of the present invention will be described based on an embodiment shown in the drawings.

In FIG. 1, an electric terminal portion 1 of the heating device, for example, a base of a halogen heater is formed of an insulating material, for example, ceramic or a ceramic material having high heat resistance, and is connected to a heating portion of the heating device, for example, a filament of a halogen lamp. A lead wire 2 extending through the terminal portion 1 extends.

The terminal portion 1 is mechanically supported by a support member 3 fixed to the machine frame.

The grip portion 3a that is in contact with the terminal portion 1 of the support member 3 and surrounds the terminal portion 1 is formed of a non-conductive material such as resin having a low hygroscopic property. The holder portion 3b that fits into the groove portion of the grip portion 3a and integrally supports the grip portion 3a is formed as a conductive member. These non-conductive materials have the properties shown in Table 1.

The non-conductive gripping portion 3a acts as a spacer between the terminal portion 1 and the holder portion 3b, and even if the terminal portion of the heating device absorbs moisture in a high humidity environment and causes insulation failure, the gripping portion 3a does not 1 and the holder portion 3b are sufficiently insulated, so that the insulation property of the terminal portion 1 is guaranteed.

Further, as shown in FIG. 2, the integrally formed support member 3 is provided with a notch, so that the workability at the time of mounting the heating device becomes better.

Effect With the configuration of the present invention, the heating device which is a heat source is brought into contact with the grip portion made of a resin-based non-conductive material having low conductivity and low hygroscopicity, so that the heat of the heating device does not escape through the holder portion. As a result, the efficiency of the heating device is increased, and insulation failure due to moisture absorption at the terminals of the heating device can be avoided. Moreover, since the integrally formed support member is provided with the notch, the workability at the time of mounting is improved, and the lead wire can be passed through the notch, which facilitates mounting. Further, due to its shape, the elasticity of the member is increased, and the shock at the time of mounting and the minute vibration at the time of rotation of the member can be absorbed.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a supporting member of a heating device according to the present invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a perspective view showing a schematic view of a known halogen heater, and FIG. FIG. 5 is a perspective view of the supporting member of FIG. 5, and FIG. 5 is a front view of another conventional supporting member. 1 …… Terminal part, 2 …… Lead wire 3 …… Supporting member, 3a …… Grip part 3b …… Holder part

Continuation of the front page (56) References JP 61-23182 (JP, A) JP 59-116775 (JP, A) Actual opening 58-185865 (JP, U) Actual opening Sho 56-16160 (JP , U) Actually opened 62-157089 (JP, U) Actually opened 62-38673 (JP, U) Actually opened 62-186169 (JP, U) Actually opened 62-154468 (JP, U) Actually opened 62-110957 (JP, U) Actually opened 62-33070 (JP, U) Actually opened 62-27367 (JP, U) Actually opened 60-191063 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A support member for supporting a heating device used in a fixing device of an image forming apparatus on a machine frame, the support member being formed of a low hygroscopic resin surrounding an electric terminal portion formed of a highly heat-resistant ceramic material. A support member characterized in that a non-conductive grip portion and a conductive holder portion surrounding the grip portion are integrally molded, and a cutout portion is provided in the integrally molded body.