JPH0321978A - Photoreceptor unit of image forming device - Google Patents

Abstract

PURPOSE:To exactly perform positioning with respect to an image forming means by forming an abutting and positioning surface for the image forming means cooperating with a photosensitive body on a photosensitive frame. CONSTITUTION:In an inside frame 21, the photosensitive frame 22 which rotatablly supports the photosensitive body 1 and a developing device 4 are attachably and deteachably fixed, and a cleaning device 8 is supported so that it can be turned between an operating position in the vicinity of the photosensi tive body 1 and a non-operating position distant from the photosensitive body 1. Besides, on the photosensitive frame 22, the abutting and positioning surface for at least one image forming means cooperating with the photosensitive body 1 is formed. Then, one or the plurality of such plural members as an electrifying charger 2, a transferring material guide member 5 and a transferring charger 6 which are as the image forming means can be positioned. Thus, positioning is easily and exactly performed and operability in position adjustment is much improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photoreceptor unit of an electrophotographic image forming apparatus such as a copying machine, a printer, or a facsimile.

[Prior Art] In an electrophotographic image forming device, for example, a copying machine, an electrostatic charger, an exposure device, a developing device, a transfer material guide member, a transfer charger cleaning device, etc. are arranged around the photoconductor in cooperation with the photoconductor to form an image. An image forming means for forming an image is arranged. Some image forming means, such as a charging charger, a transfer material guide member, a transfer charger, etc., require accurate positioning with respect to a photoreceptor.

In conventional copying machines, a method is disclosed in Japanese Patent Application Laid-Open No. 63-173078, in which a roller is provided on the transfer charger and the roller is brought into direct contact with the photoreceptor to keep the transfer charger at a constant distance from the photoreceptor. It is known from the official gazette.

In the conventional method, the length of the photoreceptor increases in order to bring the rollers provided in the transfer charger into contact with the area outside the image area of the photoreceptor, which increases the size of the image forming apparatus and increases the cost of the photoreceptor. was there.

Furthermore, since toner adheres to the surface of the photoconductor, that toner also adheres and accumulates on the rollers of the transfer charger.
If it sticks all over, the diameter of the roller will increase and the distance of the transfer charger to the photoconductor will change, and if it sticks locally, the outer diameter of the roller will become eccentric, causing vibrations in the transfer charger, resulting in image defects. There was a problem that occurred.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a photoreceptor unit for an image forming device that can be accurately positioned with respect to an image forming means.

[Means to solve the problem]

The present invention solves the above problem by having a photoreceptor frame that can be removably fixed to an image form or an apparatus main body, and a photoreceptor that is rotatably supported by the photoreceptor frame. ? (2) The present invention has been solved by a photoreceptor unit of an image forming device characterized in that the contact positioning surface of at least one image forming means that cooperates with the photoreceptor is shaped.

As an image form or means, one of a plurality of members such as a charging charger, a transfer material guide member, a transfer charger, etc. or 1M
Allows positioning in terms of numbers.

[Effect]

According to the present invention, the photoreceptor unit is mounted by fixing the photoreceptor frame that supports the photoreceptor of the photoreceptor unit to the main body of the image forming apparatus.

After the photoconductor unit is installed, a part of the image forming means such as a charger is assembled so as to come into contact with a predetermined position of the photoconductor frame.The image forming means is fixed to the main body of the image forming apparatus and is immovable. Since the distance to the photoreceptor L can be maintained accurately at all times, the distance can be prevented from changing due to the influence of toner or dust on the photoreceptor L.

〔Example〕

The details of the present invention will be explained based on embodiments shown in the drawings.

In FIG. 1 showing a laser printer as an example of an image forming apparatus to which the present invention is applied, a photoreceptor 1, for example, a photoreceptor drum, is charged as an image form or means for forming two images around the photoreceptor 1 using an electrophotographic method. A charger 2, an exposure optical device 3, a developing device 4, a transfer material guide member 5, a transfer charger 6, a static eliminator 7, and a cleaning device 8 are arranged. An electrostatic latent image is formed corresponding to an optical signal from an exposure optical device 3 such as a laser exposure device, and is developed by a developing device 4 to form a visible image.

A visible image, for example, a toner image, on the photoreceptor 1 is sent out by a paper feed roller 10 from a paper feed block 9 such as a paper feed outlet, is fed with timing by a registration roller 11, and is guided by a transfer material guide member 5. The image is transferred to the transfer material I2 under the action of the transfer charger 6. The transfer material l2 after the transfer is fixed by the fixing device 13, and the paper discharge roller l2 is fixed by the fixing device 13.
4. The upper cover 17 is closed by the action of l5 and wandering paper guide l6.
They are stacked on the ejection tray section 18, which is shaped like this. After the transfer, the photoreceptor l is neutralized by a static eliminating device 7, cleaned by a cleaning device 8, and the process from charging is repeated again.

The 44F electric charger 2 and the cleaning device 8 can also form one Uniso I.

The main body of the printer consists of an upper cover 17 and a lower cover 19, and the upper cover 17 is supported so as to be openable and closable relative to the lower cover 19, as shown in FIGS. Ru.

An end portion of the inner frame 2l on the downstream side in the flow direction of the transfer material 12 is attached to the inside of the lower cover 19 by a hinge portion 20, and the inner frame 21 is vertically tiltable. A photoreceptor frame 22 that rotatably supports the photoreceptor I and a developing device 4 are removably fixed to the inner frame 21, and a cleaning device 8 is placed in an operating position close to the photoreceptor 1 and in a non-operating position away from the photoreceptor I. It is rotatably supported between the operating position and the operating position. The internal frame 21 can be tilted up and down while housing the photoreceptor 1, the developing device 4, the cleaning device 8, and the charger 2, and at the position where the internal frame 2l is tilted upward, a stop link consisting of a pair of links that can be bent is formed. It is possible to be defeated by 23. A handle 24 is provided on the internal frame 2l so that it can be easily tilted.

The photoreceptor 1 and the photoreceptor frame 22 are attached and detached in the vertical direction as shown by the arrow A in FIG.
It is opened and moved to the non-operating position as shown in the figure.

A photoconductor unit 25 is formed by the photoconductor 1 and a photoconductor frame 22 that rotatably supports the photoconductor 1, and the photoconductor frames 1 and 22 support the front shaft portion 1a of the photoconductor 1. It has a rear frame 22a, a rear frame 22b that supports the rear shaft part 1b, and a connecting frame part 22c that connects the front frame 22a and the rear frame 22b. A gear 27 for driving the photoconductor is mounted on the rear shaft portion tb of the photoconductor I.
is fixed inside the main body! It can mesh with the gears of the l+K drive.

Two legs 26 are formed on the front frame 22a and the rear frame 22b, respectively, to be placed on the internal frame 21. The legs 26 also serve to position the photoreceptor l relative to the inner frame 22.

An arbitrary portion of the photoreceptor frame 22 is fastened to the inner frame 22 .

A light signal passage date 28 of the exposure optical device 3 is formed on the connecting frame portion 22c, and the exposure position relative to the photoreceptor 1 can also be set. The front frame part 22a and the rear frame part 22b have a positioning surface 29 for the transfer charger 6 on the surface between each Il1i26, and the edges of both ends of the transfer charger 6;
・'Bronches 6a, 6b can be formed so as to come into contact with the positioning surface 29. In order to ensure the positioning of the transfer nayajar 6, the springs 30 direct the respective end blocks 6a, 6b directly toward the positioners 29 of the front frame portion 22a and rear frame portion 22b. It is provided so that it can be pressed.

As shown in FIG. 7, the legs 26 can also be formed so as to sandwich and abut the transfer charger 6 at the front and rear of the flow direction of the transfer material, thereby positioning the transfer charger 6 in the front and rear direction.

In addition to or excluding the transfer charger 6, as shown in FIG. 8, a positioning surface 32 for the transfer material guide member 5 is provided on the front frame part 22a and the rear frame part 22b, and The transfer material guide member 5 can be brought into contact with the positioning member 32, and at the same time or separately, as shown in FIG. By abutting the charger 2, the positioning of the charging charger 2 and further the cleaning device 8 can be performed.

(Effects) According to the present invention, the photoconductor can be easily attached and detached as a photoconductor unit, and the workability of replacing it when the life is over is good.In addition, the image forming means that requires precision in relative position with respect to the photoconductor is the photoconductor frame. By abutting against a predetermined positioning surface, positioning can be performed easily and accurately, and the workability of position adjustment has been greatly improved.

Even if dust or toner gets into the gap between the image form and the photoreceptor frame during use and causes an error in determining the positioning distance, it will be automatically resolved during replacement.
4, it is no longer necessary to perform special work to eliminate installation position errors during replacement.

Since the present invention prevents the image forming means from coming into direct contact with the surface of the photoreceptor, there is no need to damage the expensive photoreceptor and the length of the photoreceptor does not have to be longer than its effective length. Well, Kos 1.-” I had two advantages.

[Brief explanation of drawings]

FIG. 1 is an overall schematic sectional view of an example of an image forming apparatus to which the present invention is applied, FIG. 2 is a perspective view of the upper case in an open state, and FIG. 3 is a partial front perspective view of the upper case in an open state. 4 is a perspective view of a photoreceptor unit according to the present invention, FIG. 5 is a cross-sectional view of the photoreceptor unit, FIG. 6 is a longitudinal sectional view, and FIG. 7 is a front view of a modified example of the photoreceptor unit. 8 and 9 are diagrams corresponding to FIG. 5 of a modified example. l... Photoconductor 3... Exposure optical device 4... Developing device 6... Transfer charger 7... Static eliminator 22... Photoconductor frame 25... Photoconductor unit 2... Charging Charger 5... Transfer material guide member 8... Cleaning device Fig. 3 Fig. 5 Fig. 7 Fig. 30 Fig. 6 22

Claims (2)

[Claims] (1) A photoreceptor frame that can be removably fixed to an image forming apparatus main body, and a photoreceptor that is rotatably supported by the photoreceptor frame, and the photoreceptor frame has at least one member that cooperates with the photoreceptor. A photoreceptor unit for an image forming apparatus, characterized in that a contact positioning surface for one image forming means is formed. (2) The abutting and positioning surface is formed as a surface that abuts and positions at least one of the charging charger, the transfer charger, and the transfer material guide member. Photoconductor unit of an image forming device.