JPS60241071A - Rotatable developing device with plural developing devices - Google Patents

Abstract

PURPOSE:To take a color copy accurately by an extremely compact device by fitting and supporting plural developing devices in fitting spaces formed around the shaft of a rotatable support member at equal intervals. CONSTITUTION:Three partition walls are arranged radially at an angle of 120 deg. and an external wall 7 is provided to their outside parts to form three spaces, in which the developing devices 2, 3, and 4 of three colors are fitted; and a developing cylinder 9 and a roll 10 are stored in the housing 8 of each developing device and a nonmagnetic single-component developer is held by a toner holding member 11 and a toner forming member 12. Thus, the developing devices are fitted in the housings 8 without shifting and held securely at specific positions which are adjusted once; and the structure is simple and compact and a developing device is easily replaced as a throwaway device.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is characterized in that a plurality of developing machines rotate around one axis,
The present invention relates to a developing device provided to develop a latent image on a photoreceptor.

(Prior Art) For example, a conventional multiple transfer type copying machine scans the surface of a document multiple times (for example, three times corresponding to the three primary colors of red, green, and blue) and performs a charging process the same number of times.

Some types obtain a transferred image through a haze process, a development process, and a transfer process, and then fix the image to obtain a single copy. This multi-transfer copying machine is equipped with a platen at the top for placing the original, and a scanning system (light source lamp, mirror, lens, green, blue, red color separation) for scanning the original at the bottom. A photosensitive drum that is exposed to scanning light is provided below the scanning system, and is in contact with the transfer drum at a transfer section. Around the photosensitive drum, there is a charging corotron, an exposure slit, a developing machine (magenta, yellow, and cyan developing machines corresponding to green, blue, and red) that develops the electrostatic latent image on the photosensitive drum, and a photosensitive drum. A cleaner is provided to remove the toner remaining after the transfer. There is also a paper feed tray that supplies copy paper to the transfer section.

In the above configuration, the operation will be explained. During the first scanning of an original, a green filter is placed in the optical path, and the photosensitive drum is exposed to the green component in the scanning light. A latent image resulting from the exposure is developed with magenta toner in a developing section. The developed image is transferred by a transfer unit to a copy sheet fed from a paper feed tray and held by a transfer drum.

Next, when the second document scan is performed, a blue filter is placed in the optical path.

A photosensitive drum is exposed to the blue component in the scanning light. A developing section develops the latent image resulting from the exposure using a yellow toner, and this developed image is transferred to the copy paper held by the transfer drum at the transfer section. Finally, the third document scan is performed, a red filter is placed in the optical path, and the photosensitive drum is exposed to the red component in the scanning light. A developing section develops a latent image based on this exposure using cyan toner, and the copy sheet, which is still gripped by the transfer drum, undergoes the final transfer of this developed image. After the copy paper has been transferred, it enters a fixing process and is fixed. In such a multi-transfer type copying machine using a plurality of developing machines, the plurality of developing machines must be installed along the same gate of the photoreceptor tram, so the apparatus has to be large-sized.

For this reason, a conventional method has been known in which a plurality of developing machines are arranged around one central axis, and the developing machine rotates and develops a latent image on a photoreceptor, thereby reducing the size of the apparatus. An example of this method is shown in FIG. In this figure, the scanning system, transfer section, fixing section, etc. are omitted, and only a portion of the photosensitive drum and the arrangement of the developing device are shown. The central axis 1 is the axis, and the developing machine 2. Developing machine 3. The developing device 4 is attached at an angle of 120° and has the shape of an equilateral triangular prism. When the developing machine 2 is a magenta developing machine, the developing machine 3 is a yellow developing machine, and the developing machine 1314 is a cyan developing machine, and each has toner boxes 2a, 3a, 4a, and a dispense roll 2b.
.

3b, 4b, Brengu 2c, 3c, 4c, magnet rolls 2d, 3d, 4d, and the toner is dispensed from the toner boxes 2a, 3a, 4a by the dispense roll 2b.
, 3b, and 4b before being put into the aircraft.

Frictionally charged by blenders 2c, 3c, and 4c.

It will be picked up on McNet rolls 2d, 3d, and 4d. When the photosensitive drum 5 is exposed to the green component in the scanning light, a latent image is formed.

The developing device 2 rotates to perform magenta development, which is then transferred to copy paper. Next, when the photosensitive drum 5 is exposed to the blue component in the scanning light and a latent image is formed, the developer 1a3 rotates to perform yellow development and transfer it to copy paper. Finally, when the photoreceptor drum 5 is exposed to the red component in the scanning light and a latent image is formed, the developing device 4 rotates to perform cyan development and transfer it to the copy paper carried in the transfer 1 call. be done.

After the copy paper has been transferred, it is finally subjected to a fixing operation.

(Problem to be Solved by the Invention) However, if three or more conventional developing machines including a toner box, a blender, and a magnet roll are connected and fixed to a central shaft, and an attempt is made to rotate them around the shaft, , toner boxes 2a, 3a.

Since the developing machine must be held in an upright position to prevent toner from spilling from 4a, the configuration is complicated and a large space is required, which becomes an obstacle when installing a scanning system that guides the optical image to the photoreceptor drum. The problem was that the device became larger. Furthermore, when developing by rotating multiple developing machines, it is inconvenient for the developing machines to be held in a horizontal position and not in contact with the photoreceptor drum.
Therefore, it became necessary to adjust the positions of multiple developing machines, but this operation was troublesome.

(Means and effects for solving the problems) The present invention has the following features:
This was done in view of the above, and in order to obtain an extremely compact and accurate color copier or printer, a single-component toner is used that allows the toner box to be omitted, and it is integrated around the shaft to reduce the space for inserting the developing machine. The present invention provides a rotatable developing device having a plurality of developing machines which are provided with a plurality of partition walls to form a plurality of partition walls, which can be brought into close contact with the space, and which are detachable.

(Example) Hereinafter, a dry type developing device having a plurality of rotatable developing devices according to the present invention will be described in detail. FIG. 2 is an explanatory diagram showing one embodiment of the present invention. This developing device.

Three bulkheads 6 made of metal such as aluminum or hard plastic are integrated with the shaft and extend outward from the axis at an angle of 12°, and on the outside of these three bulkheads 6, a wall is provided at right angles to the bulkhead 6. A developing device (shallow insertion space 3 (having a flit) is provided in a T-shape and is formed by a partition wall 6 and an outer wall 7 having approximately equal length in the longitudinal direction of the shaft.

Magenta developing machine 2. Yellow developing machine 3. A cyan developing device 4 is fitted. Each developing machine has a housing 8, and inside the housing 8 is a plastic developing cylinder 9.
and a rubber roll 10 that charges the toner by friction.
A non-magnetic component developer is held by a toner holding portion 11 and a toner forming member 12. The plastic developing cylinder 9 is capable of developing the photosensitive drum 5 without contact. Insertion and removal of the three developing machines 2, 3, and 4 can be easily done if the outer wall 7 is made of an elastic member or if the developing machine housing 8 is made of an elastic member.

Development [2, 3, 4] can be pulled out to the front side of the figure, and the outer wall 7. If the developing device housing 8 is made of an elastic material, it can also be pulled out in the direction of the arrow in the figure.

In the above configuration, to explain the operation, the photosensitive drum 5
is exposed by the green component in the scanning light.

The magenta developing device 2 rotates to develop the latent image formed by the exposure. Subsequently, the photosensitive drum 5 rotates, and the image is transferred to the copy paper gripped by the transfer roll in the transfer section. Next, the photosensitive drum 5 is exposed to the blue component in the scanning light, and the yellow developing device 3 rotates to develop the latent image resulting from the exposure. The image is transferred to the copy paper held by the photosensitive drum 5. Next, the photosensitive drum 5 is exposed to the red component in the scanning light, and the cyan developing device 4 rotates to develop the latent image resulting from the exposure. The photosensitive drum 5 rotates, and the image is transferred to the copy paper held by the transfer roll in the transfer section.The copy paper after the transfer is fixed in the fixing device.The developing machine of the present invention has a shaft and a An integrated developing machine insertion space is formed, and the developing machine is fitted into that space without shifting, and once the position of each developing machine is adjusted, it will not go out of order, making it possible to ensure the position of the developing machine during development. Furthermore, since the developing machine of the present invention uses a non-magnetic component toner, the developing machine can be tilted and rotated twice.

Also, by making the development non-contact with the photoreceptor drum.

The developing machine has an extremely simple structure consisting of a plastic developing cylinder, a rubber roll, a toner layer forming member, and a toner holding member, and can be made at low cost.

Therefore, the developing device can be disposable, and the developing device can be taken out after use and replaced with a new developing device. In addition, the overall shape of the developing machine is triangular prism-like as shown in the figure, and there are no unnecessary protrusions, so the optical path can be used extremely effectively, and the apparatus can be made compact. Note that 2 drawings and explanations explain the case where there are three developing machines,
Use three or more developing machines.

Development may be performed three or more times.

(Effects of the Invention) As explained above, according to the rotatable developing device having a plurality of developing devices of the present invention, there is a space for easily and consistently inserting the developing devices around one rotation axis, and a space for tightly fitting the developing devices. By providing a removable developing device (using -component toner), an extremely compact dry-type developing device having multiple rotatable developing devices was obtained.

[Brief explanation of the drawing]

Figure 1 shows a conventional rotatable multiple developing machine, and Figure 2 shows a conventional rotatable multiple developing machine. This is a rotatable multiple developing device of the present invention. Explanation of symbols ■... Central axis, 2... Developing machine. 2a...Toner, box 2b...Dispensing roll. 2C...Blender, 2d...Magnet roll. 3...Developing machine, 3a...Toner box. 3b...Dispensing roll. 3c...Blender, 3d...Magnet roll. 4... Current (jJtJM, 4a... Toner box. 4b... Dispense roll 4c... Blender, 4d... Magnet roll. 5... Photosensitive drum, 6... Partition wall. 7. ... Outer wall, 8... Housing. 9... Developing cylinder, 10... Roll. 11... Toner holding part shrine. 0 12... Toner forming part shrine. Patent applicant Fuji Xerox Co., Ltd. agent Person Patent Attorney Nobuyuki Matsuhara Agent Patent Attorney Kiyoshi Muraki Agent Patent Attorney Taira 1) Attorney Tadao Patent Attorney Atsushi Ueshima − Agent Patent Attorney Hitoshi Suzuki 1 Figure 1

Claims (1)

[Scope of Claims] A support member that rotates about one shaft and has a plurality of developing device fitting spaces formed at equal intervals around the shaft to fit and support developing devices. A plurality of one-component developers that are fitted and supported in the developer fitting space and that sequentially face the photoreceptor in a non-contact manner by rotation of the support member to develop the electrostatic latent image on the photoreceptor. What is claimed is: 1. A rotatable developing device having a plurality of developing devices, characterized in that it is comprised of a developing device.