JPH0226143Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a support structure for a lamp for a heat fixing device applied to an electrophotographic device, an electrostatic recording device, or the like.

Traditionally, fixing devices for electrophotographic devices, etc.
A hot roll type fixing device that fixes a toner image on a support such as paper using heat and pressure is often used.
Generally, a heat roll type fixing device includes a pair of fixing rollers, at least one of which is a heating roller, in order to sandwich and convey a support supporting a toner image. In this heating fixing roller, a heat source is provided inside the roller in order to achieve thermal efficiency and uniform temperature distribution on the roller surface. (For example, special public relations
-Refer to Publication No. 14119) The above heat source is a halogen lamp (for example, Kaisho
58-169142) is generally used. FIG. 3 shows a sectional view of a heat fixing roller supporting this halogen lamp with a conventional structure. The heat fixing roller 1 has a roll body 2 made of a metal material with good thermal conductivity (aluminum alloy, stainless steel, etc.), and a halogen lamp 3 provided inside the roll body 2. Halogen lamp 3 is a jacket tube (quartz tube)
A filament 32 is housed inside the filament 31, and has electrodes 33 at both ends for supplying power to the filament 32, and the electrodes 33 are provided within a base (insulator) 34. The electrode 33 is supported by a pair of external electrodes 4 erected on a fixing device main body (not shown).

[Problem that the invention attempts to solve]

As a structure in which the electrodes provided at both ends of the lamp are supported by external electrodes, as shown in FIG. 3 and FIG.
a into the recessed part of the electrode 33, and
is often directly sandwiched between external electrodes. However, with such a structure, even if the lamp is easy to replace, the electrode 33 and the tip portion 4a can easily become disengaged due to vibrations or shocks during transportation or transportation of the fixing device, and the lamp may become damaged. There was a problem that accidents occurred due to falling off and damage.

Furthermore, as shown in FIG. 5, it is also possible to support the lamp by using the lamp 3 having the lead wire 6 and inserting the base 34 into the hole of the support member 5 without using the above-mentioned external electrodes. It is being done. However, although this structure prevents the lamp from falling off, it is necessary to remove parts (such as connectors) attached to the support member 5 and lead wire 6 from the fuser body each time the lamp is replaced, which requires maintenance and inspection. The problem was that it was difficult to do.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a support structure for a heat fuser lamp that can prevent the lamp from falling off and is easy to maintain and inspect.

[Means to solve the problem]

The support structure of the heat fuser lamp of the present invention is provided at both ends of the lamp, and this external electrode made of a conductive material with spring properties supports the electrodes held in the insulator from both sides of the lamp. The insulator is formed from a plate-like member and has a holding hole that receives the outer peripheral surface of the insulator and a substantially U-shaped protrusion that presses the electrode toward the lamp, and the insulator is inserted into the holding hole only from the axial direction. Further, the tip of the protrusion is inserted into the recess of the electrode.

〔Example〕

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view of a support portion of a halogen lamp according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of an external electrode, and the same parts as in FIG. 3 are designated by the same reference numerals.

In FIG. 1, a halogen lamp 3 has a structure similar to that in FIG. 3, and includes an envelope tube 31 housing a filament 32 and an electrode 33 supported by a ring-shaped base 34. The external electrode 40 is provided upright at a predetermined position on a fixing device main body (not shown). This external electrode 40 includes a base 41 in which a holding hole 42 is formed, and a base 41 as shown in FIG.
1 and a substantially U-shaped bent portion 44 formed by cutting out a portion of 1. The holding hole 42 is sized to receive the base 34 of the halogen lamp 3 and to securely hold the base 34.
The bent portion 43 has a shape and dimensions such that its tip 44 can be inserted into the recess of the electrode 13 and can apply a pressing force to the electrode 33 toward the filament 32 side.

According to the support device shown in FIG. 1, the outer circumferential surface of the base 34 of the halogen lamp 3 is fitted into the holding hole 42 of the external electrode 40, so that movement in the directions of arrows a and b is restricted. . Further, since the halogen lamp 3 is pressed along the longitudinal direction from both sides by the bending portion 43, its movement in the direction of arrow c in the figure is restricted. In this way, the movement of the halogen lamp 3 in each direction is restricted by the external electrode 40, so that it will not fall off even if shock or vibration is applied to the fixing device. Furthermore, by removing one of the external electrodes 40 from the fixing device main body, the halogen lamp 3 can be easily removed.

The external electrode may be made of any material that can supply electricity to the filament and be elastically deformable. That is, the external electrode has good electrical conductivity, and
It may be formed of a material having spring properties, for example, a phosphor bronze plate. Also, in order to provide spring properties, the thickness is preferably about 0.5 to 1.0 mm.

According to the inventor's experiments, the thickness of the external electrode 40 was
It was formed from a 0.8mm phosphor bronze plate (C5191P), and the hole diameter was set 0.1 to 0.2mm larger than the outside diameter of the lamp base to support a commercially available halogen lamp, making it easy to attach and detach the lamp. It was confirmed that the lamp did not fall off even when subjected to a drop test at a height of 1 m. Note that the outer diameter of the lamp base in this case was 8.0 mm.

[Effect of idea]

As described above, according to the present invention, both ends of the halogen lamp are supported by electrodes having fitting holes and longitudinally displaceable projections, so that the halogen lamp can be prevented from falling off and can be easily removed. can be done.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a support structure for a halogen lamp according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view showing a supporting electrode of the present invention, and FIG. 3 is a heat fixing using a conventional support structure. The longitudinal sectional view of the roller, and FIGS. 4 and 5 are perspective views showing a conventional halogen lamp support structure. 3: Halogen lamp, 33: Electrode, 40: Support electrode.

Claims (1)

[Scope of utility model registration request] In a support structure for a heat fuser lamp, in which electrodes provided at both ends of the lamp and held in an insulator are supported by external electrodes from both sides of the lamp, the external electrodes are made of a single piece made of a conductive material having spring properties. The insulator is formed of a plate-like member, and has a holding hole that receives the outer peripheral surface of the insulator, and a substantially U-shaped protrusion that presses the electrode toward the lamp, and the insulator is held in place only from the axial direction. A support structure for a lamp for a thermal fixing device, wherein the support structure is inserted into a holding hole, and a tip end of the protrusion is inserted into a recess of the electrode.