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Image forming apparatus

An imaging device and imaging technology, applied in electrography, optics, instruments, etc., can solve problems such as joint leakage

Active Publication Date: 2010-01-13
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the aforementioned image forming apparatus equipped with a liquid-cooling type cooling system is continuously operated for a long time, the coolant may pass through pipes (for example, coolant inlets or outlets connected to heat-absorbing members adjacent to the developing unit) due to aging of the image forming apparatus and the like. Leakage at the joint between the pipe on the side) and the pipe used to form the circulation channel

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0025] figure 1 An image forming apparatus 1 equipped with a liquid cooling type cooling system according to Embodiment 1 of the present invention based on electrophotography is shown. The image forming apparatus 1 is a high-speed machine capable of performing an image forming process such as printing at a speed of 100 to 120 sheets of A4 size paper per minute, where a recording medium such as a plurality of sheets can be fed continuously for a long period of time (for example several days).

[0026] Such as figure 1 As shown, an image forming apparatus (which may be a printer) 1 configured to output black and white images includes a photosensitive drum 2 around which a charging roller 3 , a developing unit 4 , a transfer roller 5 , and a cleaning unit 6 are arranged. The fixing unit 7 is arranged downstream of the transfer roller 5 in the conveying direction of the recording paper P. As shown in FIG. The developing unit 4 thermally contacts the heat absorbing member 11 of t...

Embodiment approach 2

[0043] According to Embodiment 2, such as Figure 4 As shown, the inlet-side ducts 18a and 18b on one side of the heat-absorbing member 11 are bent approximately 90 degrees downward at their intermediate portions, so that the joint portions 19a and 19b are vertically arranged in the space A surrounded by the shielding member 21, This is in contrast to Embodiment 1 in which the joint portions 19a and 19b are arranged horizontally. Embodiment 2 is otherwise similar to Figures 1 to 3 Embodiment 1 is shown, so descriptions of similar elements or functions are omitted.

Embodiment approach 3

[0045] According to Embodiment 3, such as Figure 5 As shown, the inlet-side ducts 18a and 18b on the side of the heat absorbing member 11 are bent upward about 90 degrees at their intermediate portions so that the joint portions 19a and 19b are vertically arranged in the space A surrounded by the shielding member 21 . Embodiment 3 is otherwise similar to Figures 1 to 3 Embodiment 1 is shown, so descriptions of similar elements or functions are omitted. In this embodiment, as in Embodiment 1, it is also possible to prevent the imaging portion 22 and the electrical component driving portion 23 from being immersed in the coolant once leaked via the joint portion 19a or 19b due to aging of the device.

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Abstract

An image forming apparatus having a liquid-cooled cooling system prevents problems caused by a potential leakage of coolant used in the liquid-cooled cooling system. The liquid-cooled cooling system cools a heat-generating image forming portion using the coolant, which is circulated by a pump through a circulating path. The cooling system includes a heat-receiving member disposed in thermal contact with the image forming portion to absorb heat generated by the image forming portion. The heat-receiving member is connected with the circulating path via a joint. The joint is disposed within an enclosed space between the image forming portion and an electrical component drive portion for driving or controlling the image forming portion, so that the image forming portion and the electrical component drive portion can be protected from the coolant in the event of coolant leakage via the joint.

Description

technical field [0001] The present invention generally relates to image forming apparatuses, such as copiers and printers, for forming images based on electrophotography. In particular, the present invention relates to an image forming apparatus equipped with a liquid cooling type cooling system for cooling a heat generating unit of the apparatus, such as a developing unit. Background technique [0002] Electrophotographic image forming apparatuses, such as copiers, printers, facsimile machines, and multifunction peripherals, contain various units that generate heat during image forming operations, such as a writing unit and a developing unit. The units are cooled by an air cooling system using cooling fans. However, the amount of heat generated by these units in an imaging device has increased due to an increase in the processing speed of image formation. Particularly in developing units, the increased speed at which the developing process is carried out has resulted in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G21/20G03G15/08
CPCG03G2221/1645G03G21/20
Inventor 冈野觉平泽友康中村均
Owner RICOH KK