JPS5814358Y2 - Surface heater fuser - Google Patents

Description

[Detailed description of the invention] The present invention is a so-called PHF (Plane Heater), which is suitable as a heat fixing device for electronic copying machines, etc.
Fuser), and particularly relates to improvements in supporting means for the surface heater element.

In a thermal fixing device, it is necessary to maintain uniform heat distribution in the fixing area, and for this purpose, the surface heater element must always be held at a predetermined constant position.

FIG. 1 is a plan view showing a schematic structure of a support portion of a conventional surface heater element, and FIG. 2 is a cross-sectional view taken along the line ■-■.

Reference numeral 1 denotes a support fixed at an appropriate position on a housing for a fuser (not shown); 2 a surface heater element disposed on the support 1 via a spacer 3; and 4, the spacer 3 is connected to the support 1.
At the same time, the surface heater elements 2A and 2B are attached to the spacer 3.
A fixing screw 5 clamps the fixing screw 4 between the support body 1
This is a clip for attaching to.

In this case, the gaps between the surface heater elements can be kept small and the surface heater elements can be arranged densely, so the temperature distribution as a fixing device is good, but the support 1 is easily damaged and the surface heater elements can come off. In order to prevent or prevent scorching of the recording paper, a large number of fixing screws are required, which increases the number of parts and assembly man-hours, resulting in high costs.

FIG. 3 is a schematic perspective view of another conventional example, in which surface heaters 2A, 2B, and 2C similar to those in FIG. Lower support rod? , 8, and a spacer 3A is inserted between the adjacent surface heaters.

In the illustrated example, the spacer 3A is fitted onto the upper support rod I and is configured to straddle the lower support rod 8.

This complicates assembly work, resulting in poor workability, and also makes it difficult to narrow the gap between adjacent surface heater elements, resulting in poor temperature distribution as a fixing device.

The present invention improves the above-mentioned drawbacks by inserting a support seat with a convex cross section between adjacent surface heater elements without fixing them to the support (for example, by simply placing them), and is held between the enlarged lower portion of the support seat and a support rod that intersects with the surface heater element.

The present invention will be explained with reference to FIGS. 4 and 5.

The same reference numerals as in FIGS. 1 to 3 refer to the same or equivalent parts, and 9 is a cross section that is simply placed on a support (not shown) and inserted between adjacent surface heater elements. Convex support seat, 10A.

10B is a heater terminal, and 11 is a fuser housing.

In the present invention, the support seat 9 with a convex cross section is simply placed on an appropriate location on the support, the surface heater element 2 is further placed on top of the support seat 9, and the upper support rod 7 is attached to the fuser hose 11. It can be easily assembled by simply fixing it.

Since only the reduced portion 9B of the support seat 9 having a convex cross section is interposed between adjacent surface heater elements 2, the gap can be made small, and the surface heater element 2 is connected to the enlarged portion 9 of the support seat 9.
Since it is securely held between the upper surface of A and the upper support frame 7, the surface heater element is prevented from coming off and the recording paper is prevented from being scorched, and the support seat 9 is simply placed on a support (not shown). Therefore, damage to the support does not occur.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a surface heater buttoned in a conventional heat fixing device, Fig. 2 is a sectional view taken along the line ■-■, Fig. 3 is a perspective view of the main part of another conventional example, and Fig. 4 is a main part of the main part of a conventional heat fixing device. A schematic perspective view of one embodiment of the invention,
FIG. 5 is a perspective view of the main part. 2... Surface heater element, 7... Upper support frame, 8... Lower support rod, 9... Support seat, 9A... Ampulla, 9B...
・Reduction part, 11...Fuser housing.

Claims (2)

[Scope of utility model registration request] (1) Fusing device: A surface heater fixing device consisting of a waging and a surface heater element disposed inside it, has a plurality of cross-sectional convexities whose upper reduced portions are inserted between adjacent heater elements. a shaped support seat, and a plurality of upper support rods installed above and intersecting with the heater element, the plane heater element being sandwiched between the lower expanded portion of the support seat and the upper support rods; A south heater fixing device characterized by: (2) The surface heater fixing device according to item 1, wherein the support seat is simply placed on the support.