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Image heater with flexible sleeve

A technology of heating device and sleeve, which is applied in electric heating device, ohmic resistance heating, electric recording process applying charge pattern, etc., can solve the problems of slow rotation and walking speed of diaphragm, longer device requirement, poor fixing and other problems

Active Publication Date: 2007-09-12
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] In addition, when the ribs contact the diaphragm strongly in this way, since the heat is taken away from the diaphragm by the ribs, temperature unevenness occurs on the diaphragm.
That is, since the temperature of the portion in contact with the rib is lowered, when the material to be heated is heated at the nip portion, heating unevenness occurs as it is, and when the image is heated and fixed, uneven gloss or fixing failure occurs at the position corresponding to the rib.
[0030] In conventional devices, since the diaphragm rotates at a slow speed, such phenomena of diaphragm damage and uneven heating are not noticeable, and it is not necessary to consider the shape of the restricting member and the rib from this point of view.
[0031] However, in recent years, the speed of printers equipped with heating devices of the film heating method has been significantly increased, and the life of the devices tends to be longer.

Method used

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  • Image heater with flexible sleeve
  • Image heater with flexible sleeve
  • Image heater with flexible sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] FIG. 1 is a side sectional model view showing the heating device of this embodiment, and FIG. 2 is a front sectional model view of the heating device.

[0054] 10 is a cage for heat-insulating and supporting the heating body 3 described later, which is a horizontally long member with an upward substantially semicircular arc shape in cross section, and serves as a guide member for the inner surface of the diaphragm (flexible sleeve member) (hereinafter referred to as as a diaphragm guide member).

[0055] The heater 3 is a horizontally long linear heater with low heat capacity, and is fixedly supported by being fitted and bonded in a groove 10a provided longitudinally on the outer lower surface of the diaphragm guide member 10 .

[0056] 2 is a cylindrical heat-resistant diaphragm (flexible sleeve member) overlaid on the diaphragm guide member 10 including the heating body 3 . The inner circumference of the cylindrical heat-resistant diaphragm 2 is about 3 mm longer tha...

Embodiment 2

[0082] FIG. 5 is a cross-sectional view in which the diaphragm guide member 30 and the sliding surface 71 b of the restricting member 71 that slides on the inner surface of the diaphragm are superimposed.

[0083] As shown in FIG. 5, the sliding surface 71b of the restricting member 71 of this embodiment that slides with respect to the inner surface of the diaphragm has a substantially circular shape on the upstream side in the diaphragm rotation direction of the nip part N, and on the contrary, is on the downstream side of the nip. There is a convex portion near the holding portion N. The perimeter of the sliding surface 71b that slides relative to the inner surface of the diaphragm of the restricting member 71 has a very small gap, and the two are almost equal. Almost the same shape. Also in the case of this embodiment, the contours of all the ribs 31 of the plurality of ribs provided in the longitudinal direction of the diaphragm guide member 30 on the upstream side of the...

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PUM

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Abstract

The image heating apparatus for heating an image formed on a recording material includes a flexible sleeve member, a guide member, a regulating member having a flange portion and a sliding portion, a rotatable member, a nip portion and a plurality of ribs. The plurality of ribs are positioned in the manner the contour of the plurality of ribs is positioned inside the contour of the sliding portion of the regulating member along the longitudinal direction of the image heating apparatus. Thereby, a reduction in the durability of the flexible sleeve member can be suppressed.

Description

technical field [0001] The present invention relates to an image heating device suitable for mounting on a copier or a printer as a fixing device, and particularly relates to an image heating device having a flexible sleeve. [0002] This device can be used as an image heating and fixing device in image forming devices such as electrophotographic copiers, printers, and facsimile machines, that is, it can be used as an image forming mechanism suitable for electrophotography, electrostatic recording, magnetic recording, etc. Heating and fixing of toner images formed on transfer paper (transfer sheets, electrophotographic papers, electrostatic recording sheets, printing papers, etc.) with toners made of fusible resins, etc. Heating and fixing of images to permanently fix images device. [0003] In addition, for example, a device for heating and modifying (polishing, etc.) the surface of an image-carrying transfer paper, or a device for performing temporary fixing treatment may a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20H05B3/00
CPCG03G15/2078G03G15/2053G03G2215/2035
Inventor 福泽大三田村畅也
Owner CANON KK