JPH02188776A - Electrophotographic recorder - Google Patents

Abstract

PURPOSE:To easily attach and detach a photosensitive drum by movably providing a holding member which integrally holes a light source part and a lens array in the shaft center direction of the photosensitive drum, holding it at a prescribed recording position and simultaneously driving it so that it is kept away from the photosensitive drum. CONSTITUTION:The light source part 2 is provided on the lower surface of the holding member 11 which integrally holds the light source part 2 and the lens array 3 and simultaneously leg parts 11a and 11b are provided. The holding member 11 is provided so that it can be moved in the shaft center direction of the photosensitive drum 1. When the photosensitive drum 1 is exchanged, attractive force works between the iron core of an electromagnet 17 and a permanent magnet 18 and the holding member 11 is driven in the direction that it is rapidly kept away from the photosensitive drum 1 along a guide groove 12a by the attractive force and the energizing force of a spring 16. Thus, a space is formed between the holding member 11 and the photosensitive drum 1 and the photosensitive drum 1 can be easily taken out from the space. Simultaneously, a new photosensitive drum can be easily installed through the space.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrophotographic recording device that is equipped with a play-shaped light source section and in which a photoreceptor drum for electronic image formation is replaced at the end of its life. It is something.

[Conventional technology]

2 and 3 are schematic side and perspective views showing a conventional electrophotographic recording apparatus disclosed in, for example, Japanese Patent Application Laid-open No. 61-95956. First, in FIG. A photoreceptor drum for image formation; 2 is an array-like light source section made up of a one-dimensional array of light emitting elements such as a large number of light emitting diodes; 3 is a light source section for transmitting light from the light source section 2 onto the photoreceptor drum 1; A light transmission member, in this example, one focusing light transmission element.
A lens array 3 arranged dimensionally is used. 4 is a charger that uniformly charges the surface of the photoreceptor drum 10; 5 is a developer that attaches toner to the exposed photoreceptor drum 1; 6 is a recording paper that is moved in contact with the photoreceptor drum 1; and 7 is a photoreceptor. The toner image developed on the body drum 1 is transferred to the recording paper 6.
8 is a fixing device that heats and fixes the toner image transferred to the recording paper 6; 9 is a cleaning device that cleans the toner adhering to the photosensitive drum 1; 10 is a cleaning device that cleans the toner adhered to the photosensitive drum 1;
2 is an exposure device that exposes the entire surface of the photosensitive drum 1, and 2 is a different optical path length from the light source section 2 to the photosensitive drum 1 through the lens array 3.

Next, in FIG. 3, 23 indicates the photosensitive drum 1 on its shaft 1
A pair of side plates rotatably supported via a, 21 are a pair of holding members that integrally hold the light source section 2 and the lens array 3 at both ends thereof, and are provided with a protrusion 21a. . 22 is a guide member provided on the side plate 23, and the guide member 22
2a is provided, and the protrusion 21a is slidably fitted into this groove 22a. This allows the holding member 21 to move in the axial direction of the photosensitive drum 1.

Reference numeral 27 denotes a position regulating roller, which is rotatably provided on the holding member 21 via a shaft 27a, and is brought into contact with the curved surfaces of both ends of the photosensitive drum 1. 25 is a pin provided on both sides of the holding member 210, 26 is a pin provided on the side plate 23,
A spring 24 has both ends connected to pins 25 and 26, and urges the holding member 21 in a direction toward the photosensitive drum 1.

The surface of the photo drum 10 is uniformly charged. Next, the photosensitive drum 1 is exposed through the lens array 3 by light corresponding to image information obtained from the arrayed light source section 2, and an electronic image is formed. Toner is attached to this electronic image by a developing device 5 to develop a toner image, and this toner image is transferred onto a recording paper 6 by a transfer charger 7. The recording paper 6 onto which the toner image has been transferred is subjected to a heat fixing process in a fixing device 8, and then is discharged to the outside of the apparatus. On the other hand, after the remaining toner is removed from the photoreceptor drum 1 by the washer 9, the photoreceptor drum 1 is cleaned by the exposure device 1.
0, the entire surface is neutralized and returns to the initial state.

In such an apparatus, since the focal length of the lens array 3 is generally short, strict precision is required for the optical path length p from the light source section 2 through the lens array 3 to the photosensitive drum 1. The optical path length 2 changes if the photosensitive drum 1 is eccentric, which adversely affects the resolution of the recorded image. In order to eliminate changes in the optical path length due to eccentricity of the photosensitive drum 1, the configuration shown in FIG. 3 is used.

That is, in FIG. 3, the holding member 21 that holds the arrayed light source section 2 and the lens array 3 is held by the spring 24.
It is urged in a direction approaching the photoreceptor drum 1. Also,
This holding member 21 is provided with a roller 27 for position regulation, and is brought into contact with the photosensitive drum 1 by the biasing force of a spring 24 . Therefore, when the photoreceptor drum 1 has an eccentricity, the row 227 rotates following the photoreceptor drum 1, and at this time, the row 227 follows the eccentricity and moves in the axial direction. Since the holding member 21 and the light source section 2, lens array 3, etc. that are integrated therewith also change, the optical path length 2 is held constant regardless of eccentricity.

[Problem to be solved by the invention]

Since the conventional electrophotographic recording device is configured as described above, when the photosensitive drum 1 reaches the end of its life and is to be replaced, the light source section 2, lens array 3, etc. built in the vicinity can be easily removed. Therefore, replacing the photosensitive drum 1 has become extremely troublesome. Especially in recent years,
Cartridge-based image forming units are becoming common; for example, photosensitive drums 1. Charger 4. There is a device in which the developing device 5, the cleaning device 9, etc. are integrated into a cartridge, and each cartridge is replaced at the end of its life. There were problems such as the need to particularly simplify attachment and detachment operations.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide an electrophotographic recording apparatus in which the photosensitive drum 1 can be easily replaced.

[Means to solve the problem]

The electrophotographic recording device according to the present invention includes a holding member that integrally holds a light source section and a light transmission member, which is movable in the axial direction of the photoreceptor drum, and which holds the holding member at a predetermined recordable position. A driving means is provided for driving the photoreceptor drum away from the photoreceptor drum when the photoreceptor drum is held at the same position.

[For production]

In the electrophotographic recording apparatus of the present invention, the photosensitive drum can be easily attached and detached by moving the holding member away from the photosensitive drum.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1.2.3 is substantially the same as the photosensitive drum 1, arrayed light source section, and lens array 3 in FIGS. 2 and 3. Reference numeral 11 denotes a holding member that integrally holds the light source section 2 and the lens array 3. The light source section 2 is provided on the lower surface of the holding member 11, and leg sections 11a and 11b are also provided.

The leg portions 11a and 11b hold the lens array 3 so as to be spaced from the light source portion 2 and the photosensitive drum 1 at a predetermined distance, respectively. , 12 are a pair of guide members provided with a guide groove 12a, into which both ends of the holding member 110 are slidably fitted. As a result, the holding member 11 is attached to the arrow A of the photoreceptor drum 1.
It is configured to be movable in the axial direction shown by.

Reference numerals 13 and 14 denote a pair of side plates, on which the guide member 12 is provided. 15 is a top plate supported at both ends by side plates 13 and 14, and 16 is a spring whose both ends are connected to the top plate 15 and the holding member 11, urging the holding member 11 upward in the figure. 1
7 is an electromagnet provided on the bottom surface of the top plate 15; 18 is a permanent magnet provided on the top surface of the holding member 11 facing the electromagnet 17; 19 is a permanent magnet provided at both ends of the holding member 11 and both ends of the photosensitive drum 1. This is a spacer for position regulation that is interposed between the two parts. In addition, spring 16. The electromagnet 17 and the permanent magnet 18 constitute a driving means for holding the holding member 11 in a predetermined position and driving it away from the photosensitive drum 1 .

Next, the operation will be explained. FIG. 1 shows a recordable state, in which the electromagnet 17 is energized and the generated electromagnetic force and the magnetic force of the permanent magnet 18 are repelling against the spring 16. This repulsive force urges the holding member 11 to approach the photosensitive drum 1, and the holding member 11 is maintained in a position regulated by the spacer 19. In this state, the photosensitive drum 1 is rotated and the recording operation described above is performed.

At this time, even if the photoreceptor drum 1 is eccentric, the holding member 1
1 changes in the axial direction according to the eccentricity via the spacer 19, so the optical path length is constant! is retained.

When replacing the photosensitive drum 1, power to the electromagnet 17 is cut off. As a result, the iron core of electromagnet 17 and permanent magnet 1
8, and by this attraction and the biasing force of the spring 16, the holding member 11 is rapidly driven upward in the figure, that is, in a direction away from the photosensitive drum 1, along the guide groove 12a. .

Therefore, a space is formed between the holding member 11 and the photoreceptor drum 1, and the photoreceptor drum 1 can be easily taken out from this space, and a new photoreceptor drum can be easily installed.

Note that when the holding member 11 is brought into contact with the photoreceptor drum 1 via the spacer 19, depending on the shape of the spacer 19, if the contact is made suddenly, the photoreceptor drum 1 may be damaged. In that case, by controlling the current supplied to the electromagnet 17 to control the strength of the electromagnetic force, the holding member 11 can be brought into gentle contact.

Further, the spacer 19 is not limited to the illustrated position, but may be provided at any other suitable position. Further, although a play-shaped light source section 2 in which light emitting elements are arranged is used, it may have another structure.

〔Effect of the invention〕

As described above, according to the present invention, the holding member that integrally holds the light source section and the lens array is provided movably in the axial direction of the photoreceptor drum, and this holding member is held at a predetermined recording position. Since it is configured to be driven away from the photoreceptor drum, it is possible to easily attach and detach the photoreceptor drum.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an electrophotographic recording device according to an embodiment of the present invention, FIG. 2 is a schematic side view showing a conventional electrophotographic recording device, and FIG. 3 is a perspective view of the main parts of the device. It is. 1 is a photosensitive drum, 2 is a light source section, 3 is a lens array, 1
1 is a holding member, 12 is a guide member, 16 is a spring, 17 is an electromagnet, and 18 is a permanent magnet. In addition, the same symbols in the figures indicate the same or equivalent parts. 18.Ice straw stone

Claims (1)

[Claims] In an electrophotographic recording device that exposes light from a light source section onto a photoreceptor drum through a light transmission member, the holding member integrally holds the light source section and the light transmission member, and the holding member is attached to the photoreceptor drum. a guide member that holds the holding member movably in the axial direction thereof, and provides a holding force that holds the holding member at a predetermined position where recording can be performed, and moves the holding member from the predetermined position in a direction away from the photosensitive drum. 1. An electrophotographic recording device comprising a driving means for applying driving force.