KR940002112Y1 - Noise-reducing device in a fixing apparatus - Google Patents

Abstract

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Description

Fuser noise suppression device

1 is a schematic view of a copier.

2 is a view illustrating a conventional fuser.

3 is an exemplary embodiment of the fixing unit of the present invention.

* Explanation of symbols for main parts of the drawings

6: support 7: compression spring

The present invention relates to a fixing unit for fixing an image transferred to toner on a sheet on a sheet in an electrophotographic processor.

A commonly used copying apparatus is described below with reference to the electrophotographic copying system system shown in FIG.

The surface of the photoconductdr 28 is evenly charged by the corona discharge of the charger 25 and the portion charged by the rotation of the photosensitive drum 28 is driven by the light source of the exposure lamp 22. The light is reflected by the light reflected from the original on the platen glass 21.

After the concentration is processed by the four mirrors 23 and the lens 24 by this concentration, an electrostatic latent image such as an image of the original is generated on the photosensitive drum 28. In this case, the generated latent image develops into a visible image while developing with a toner while passing through the developing unit 27, and is then transferred onto the copy paper fed by the paper feed roller 20. ), The visible image on the photosensitive drum 28 is transferred to the copy paper 31.

Thereafter, the separated copy paper is transported by the transfer valve 30 to be transported to the discharge tray 39 between the heating roller 35 and the pressure roller 34 of the fixing unit 40. Then, the image of the original is settled on the copy surface by heat and pressure, and the desired copy is made. On the other hand, residual toner and latent image are present on the drum passing through the transfer machine 32, where the toner is removed by a cleaning blade 29, and the latent image is a pre-erase lamp 37 ) To be removed.

Conventionally, in such an apparatus, an image of a document transferred to a toner on a sheet is fixed by a row of the heating roller 35 while passing between the heating roller 38 and the pressing roller 34 of the fixing unit 40. Bearings 1 and 2 are fitted at both ends of the heating roller 35 so as to be installed on both side walls 41 and 42, and are installed on both side walls 41 and 42 by the bearings 1 and 2. Rings 1 'and 2' are installed on the outer circumferential surfaces of the bearings 1 and 2, and the rings 3 and 4 are fitted to have a predetermined gap so as to overlap at the outside of the bearings 1 and 2. To one side, the gear 5 is integrally installed and configured to receive power from a power source.

The heating roller 35 configured as described above is heat-conducted to a heating lamp (not shown) when the power is applied to the device, and the heating roller 35 has a predetermined temperature of heat, and thus the heating roller 35 Is expanded to be deformed in the longitudinal direction and is pushed toward both ring 1 'and 2' installed in view of the distance tolerance caused by thermal expansion of the heating roller 35.

When the preheating time of the heating roller 5 is pressed as described above, when the copy start button of the machine is pressed, the copy paper 31 loaded in the cassette is fed by the feed roller 20 and transferred to the drum 28 by the feed roller. After transferring the image of the drum surface to the copying paper 31 while passing the fryer 32, it is transported by the conveying roller 30 and between the heating roller 35 and the pressing roller 34 of the fixing unit 40. By passing through the heating roller 35, the image transferred to the copy paper 31 is fixed and discharged by the media roller.

In the above apparatus, the heating roller 35 of the fixing unit 40 is thermally expanded and the bearings 1 and 2, which are installed by being fitted to both sides of the heating roller 35, are pushed from both sides to both sides or only one side thereof. It is in the state pushed outward.

In such a device, the heating roller 35 of the fixing unit 40 is thermally expanded so that the bearings 1 and 2 installed on both sides of the heating roller 35 are pushed from both sides to the outside, or only one side is outside. It is pushed out.

In this state, the copying stops and after a certain time, the heating roller 35 is contracted and returned to its original state. At this time, the bearings 1 and 2 installed on both sides are not positioned as the initial state on both plates 41 and 42. As shown in FIG. 2B, the bearings 1 and 2 and the heating roller 35 are in an unstable position while being unbalanced in the bearing plates 41 and 42. .

According to the related art, the bearing installed in the heating roller is interlocked in a non-uniform state when interlocked with the rotation of the heating roller, so that a lot of noise is generated by rotational friction due to the rotation of the heating roller. There was a problem that had a bad effect.

The present invention has been devised to solve the above problems, and the object of the present invention is to allow the bearings installed in the heating roller to be uniformly interlocked so as to prevent noise generated from the heating roller of the mounting apparatus during copying. The purpose of the present invention is to improve the quality of the device while minimizing the noise to perform the work in a comfortable environment.

An embodiment for achieving the above object will be described in detail with reference to the accompanying drawings.

In the fixing unit 40, a heating lamp was installed at the center of the outer diameter of the fixing unit 40, and the heating roller 35 and the pressing roller 34, which are heated by the heating lamp, were brought into close contact with each other in parallel and installed on both side plates 41 and 42.

Bearings 1 and 2 are fitted to both sides of the heating roller 35 so as to be installed on both plates 41 and 42. Bearings 1 and 2 are provided on the main surfaces of the bearings 1 and 2. Rings 1 ′ and 2 ′ are installed to prevent the plates 41 and 42 from deviating from each other, and are fixed to the heating roller 35 so as to maintain a predetermined distance from the bearing 2 ′ and the other side. The ring (3) is installed to interlock between the drive gear (5) and the bearing (I) installed to receive external power.

The support ring 6 is installed inside the heating roller 35 so as to be positioned at a predetermined distance from the bearing 1, and a compression spring 7 is installed therebetween.

Looking at the effect of the present invention configured as described above are as follows.

When the user wants to make a copy, when the switch is turned on, the device enters a standby state when the heating roller 35 of the fixing unit receives a certain heat by the heating lamp.

In this case, the heating roller 35 is thermally expanded in the longitudinal direction by heat, and thus, the bearings 1 and 2 installed on both sides of the heating roller 35 to be supported by both plates 41 and 42 are bearings. It is pushed toward the ring (3) (4) which is installed to have 1) (2) and some clearance.

At this time, the bearings 1 and 2 in both plates 41 and 42 are formed by the elasticity of the compression spring 7 installed so as to support the inner wall of the bearing 1 at one end of the heating roller 35. 2) is to be pushed in a balance in both plates (41, 42).

As described above, when the heating roller 35 yale time of the fixing unit 40 is completed, the copy start lamp flashes on the function display lamp of the copier to indicate the copy start, and the user presses the copy button to operate the device. As a result, the paper loaded in the cassette is fed to the feed roller by the feed roller, and then the paper 31 is transferred by the feed roller, and passes between the photosensitive drum 28 and the transfer machine 32, and the visible image of the drum surface is toner. After the image of the document which has been developed is transferred to the surface of the paper, it is conveyed by the conveying roller 30 to reach the heating roller 35 and the pressing roller 34 of the fixing unit 40. In the above state, the mounting portion 40 is driven from the driving source (not shown) to the driving gear 5 to drive the heating roller 35, and then the paper 31 and the heating roller 35 and It is mounted while being transported between the compression rollers (34). When the copying operation is completed by the above operation, the fixing unit 40 stops driving and at the same time the power is cut off by the heating lamp which conducts heat to the heating roller 35. It is located in the water state from the expanded state. At this time, the bearings (1) and (2) receive a balanced elasticity by the support ring (6) and the compression spring (7) supported on the inner surface of the bearing (1) so as to work in a balanced manner on both plates (41) (42). Will be.

The present invention examined as described above is that the bearings are unbalanced in both plates during shrinkage expansion due to preheating of the heating rollers of the fuser so that the noise generated when driving the fuser can be prevented in advance. It is a device.

Claims (1)

Bearings 1 and 2 are fitted to both sides of the heating roller 35 of the fixing unit 40 so as to be installed on both plates 41 and 42, and the bearings 1 and 2 are both plates 41 and 42. Ring (1) (2 ') is installed to prevent the deviation from, the ring (3) (4) is installed to the outside of the bearing (1) (2), the other ring (4) is a bearing (2) The heating roller 35 is fixedly installed on the heating roller 35 to maintain a constant distance and the one side ring 3 is interlocked between the drive gears 5 installed to receive external power. Fixing device noise preventing device, characterized in that the support ring (6) is installed between one side of the bearing (1) to be located at a certain distance and a compression spring (7) is installed therebetween.