JPH03231782A - Wet type developing device - Google Patents

Abstract

PURPOSE:To always obtain a preferable quality picture by engaging driving projections with engaging perforations accompanying the rotation of the rotary drum driving a developing belt, adhering the developing belt to a sensitized body on the rotary drum, and developing latent images on the latent image forming surface of the sensitized body. CONSTITUTION:The developing belt 3 is made in an endless belt, supported by guide rollers 4a and 4b and auxiliary rollers 7a and 7b so that it can be rotated circularly and arranged such that its top part comes into contact with the electrostatic latent image surface of the sensitized paper and its bottom part is dipped in a developer 6. The plural driving projections 8 are juxtaposed on both left and right sides of the outer peripheral surface of the drum 1, and the tracking perforations 9 are juxtaposed on the developing belt so as to engaged with the driving projections 8. The tracking perforations 9 are formed in slotted holes inclined to an inside in the proceeding direction of the developing belt 3. Accompanying the rotation of the drum 1, the driving projections 8 are engaged with the tracking perforations 9, thereby driving the developing belt 3, which is adhered with the sensitized paper on the drum 1, and the latent images on the latent image forming surface of the sensitized paper are developed. Thus, without sagging the developing belt 3, preferable quality picture can be always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wet-type developing device, and more particularly, the present invention relates to a wet-type developing device, and more particularly, after forming a latent image on a photoreceptor placed on a rotating tram, a developing device containing a developing solution is used. The present invention relates to a wet type developing device that develops the latent image by bringing a belt into close contact with the latent image forming surface of the photoreceptor.

[Prior Art] Conventionally, in electrophotographic devices, an electrostatic latent image is formed on a photoreceptor based on image information using a photoconductive phenomenon, and colored powder (toner) is attached to the electrostatic latent image. It is visualized and developed by

There are two types of development methods: dry development, which uses powdered toner in a dry state, and wet development, which uses toner dispersed in an insulating liquid. In addition, in the wet development method, methods for bringing toner into contact with the photoreceptor include immersion method, 7a lower method,
There are spray type and contact type.

As a typical example of this contact type, the lower part of the conductive developing belt is immersed in the developing solution, and the upper part of the developing belt is in contact with the electrostatic latent image surface of the photoreceptor on the rotating drum, and then the guide roller is moved. There is a developing device that develops by bringing a developing solution, which is moved and sucked into the lower part of the developing belt in a developing solution, into contact with the electrostatic a image surface of a photoreceptor.

[Problems to be Solved by the Invention] However, the developing belt is usually required to have liquid absorption properties, and is made of a flexible material such as cloth or sponge. As a result, the developing belt may sag, making it difficult to maintain uniform contact with the electrostatic latent image surface of the photosensitive paper, and furthermore, liquid may accumulate on the developing belt, making it difficult to obtain high-quality images. I could not do it.

The present invention was made in order to solve the above-mentioned problems, and it eliminates the slack of the developing belt, maintains uniform contact with the electrostatic latent image surface of photosensitive paper, and smoothes the supply of developer. It is an object of the present invention to provide a wet type developing device capable of producing high-quality images.

[Means for Solving the Problems] In order to achieve this object, the wet type developing device of the present invention includes a driving protrusion provided on the circumferential surface of the rotating drum, and a driving protrusion provided on the developing belt and engaged with the driving protrusion. Nail the matching engagement hole.

Further, it is preferable that the driving protrusions are arranged in rows on both left and right sides of the circumferential surface of the rotating drum, and that the engagement hole is formed in the shape of a long hole inclined inward with respect to the direction of movement of the developing heald.

[Operation] In the wet type developing device of the present invention having the above configuration, as the rotating drum rotates, the driving protrusion engages with the engagement hole and the developing belt is driven. Here, the developing belt comes into close contact with the photoreceptor on the rotating drum, and the latent image on the latent image forming surface of the photoreceptor is developed.

Furthermore, if the engagement hole is formed in the shape of a long hole inclined inward with respect to the direction of travel of the developing heald, the developing belt is pulled in the direction of the rotation axis of the rotary tram after the driving protrusion engages with the engagement hole. .

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

First, the structure of an electrophotographic apparatus to which the wet developing apparatus of the present invention is applied will be described with reference to FIG.

That is, a charger 10 and an exposure device 1 are installed along the outer circumference of the drum 1.
1, a pre-wetting device 12, a developing device 5, and a squeeze roller 13 are provided.

Further, a photosensitive paper 2 is wrapped around the outer peripheral surface of the drum 1.

FIG. 1 shows an enlarged view of the area around the developing device 5.

The developing belt 3 has an endless belt shape, and has a guide roller 4a.
, a guide roller 4b and an auxiliary roller 7a.

It is rotatably supported by an auxiliary roller 7b, and is disposed with its upper part in contact with the electrostatic latent image surface on the photosensitive paper 2 and its lower part immersed in the developer 6.

Further, as shown in FIG. 2, a plurality of drive protrusions 8 are arranged in rows on both left and right sides of the outer peripheral surface of the drum 1, and track holes 9 that engage with the drive protrusions 8 are arranged in rows on the developing belt 3. has been done. The track hole 9 is formed in the shape of an elongated hole inclined inward with respect to the traveling direction of the developing belt 3.

Next, the action will be explained.

After an electrostatic latent image is formed on the photosensitive paper 2 wrapped around the outer circumferential surface of the drum 1 by a charger 10 and an exposure device 11, the surface of the electrostatic latent image is wetted by a pre-wetting device 12 to prevent scumming. and sent to the developing section. In the developing section, due to the engagement relationship between the driving protrusion 8 of the drum 1 and the track hole 9 of the developing heald 3, the roller is looped around four rollers: the guide roller 4a, the guide roller 4b, the auxiliary roller 7a, and the M auxiliary roller 7b. The developing belt 3 is moved in the direction of the arrow. As the developing belt 3 moves, the developer 6 is sucked into the developing belt 3 at the lower part immersed in the developer 6.
A developer 6 is supplied to the electrostatic latent image surface at the contact portion of the upper photosensitive paper 2 with the electrostatic latent image surface, thereby developing an image. Further, as shown in FIG. 2, as the developing drum 1 moves in the direction of arrow A, the developing belt 3 is moved by the engagement of the driving protrusion 8 provided on the drum 1 with the track hole 9 provided on the belt 3. In addition to being pulled in the circumferential direction A of the drum, it is also pulled outward in the axial direction of the tram 1, so that it does not sag.

After the photosensitive paper 2 is supplied with developer 6 and developed in the developing section, the excess developer 6 is squeezed out by a squeeze roller 13, and the operation is completed.

As described in detail above, in the wet type developing device of the electrophotographic apparatus of this embodiment, as the tram 1 rotates, the driving protrusion 8 engages with the track hole 9, and the developing belt 3 is driven, and the developing heald 3 is driven by the tram. Since the developing belt 1 is brought into close contact with the photosensitive paper 2 on which the latent images of the four images formed on the photosensitive paper are developed, it is possible to always obtain high-quality images without causing the developing belt 3 to sag.

Furthermore, since the track hole 9 is formed in the shape of a long hole inclined inward with respect to the traveling direction of the developing belt 3, after the driving protrusion 8 engages with the track hole 9, the developing heald 3 is rotated by the rotation of the drum 1. It is also pulled outward in the axial direction, and the developing belt 3 does not slack in this direction.

Note that the present invention is not limited to the embodiments described above, and modifications can be made without departing from the spirit thereof.

[Effects of the Invention] As is clear from the above detailed description, in the wet type developing device of the present invention, as the rotating drum rotates, the driving protrusion engages with the engagement hole to drive the developing belt. Since it is in close contact with the photoreceptor on the rotating drum and the latent image on the latent image forming surface of the photoreceptor is developed, a high quality image can always be obtained from the developing heddle.

Furthermore, if the engagement hole is formed into a long hole shape that is inclined inward with respect to the traveling direction of the developing belt, after the driving protrusion engages with the engagement hole, the developing belt is pulled outward in the direction of the rotation axis of the rotating drum. Therefore, the developing belt does not sag in this direction, and even better quality images can be obtained.

[Brief explanation of drawings]

Figures 1 to 3 show embodiments embodying the present invention. Figure 1 is an enlarged view of the vicinity of the developing device, Figure 2 is an enlarged view of the drum and developing belt, and Figure 3 is an enlarged view of the main body. FIG. 1 is a configuration diagram showing the configuration of an electrophotographic apparatus according to an example. In the figure, 1 is a drum, 2 is a photosensitive paper, 6 is a developer, 8 is a driving protrusion, and a hole. 3 is the reality 1 The bell 9 is the truck Patent applicant Yoshitsugu Yasui, president of Brother Industries, Ltd. Figure 1

Claims (1)

[Scope of Claims] 1. After forming a latent image on a photoconductor placed on a rotating drum, a developing belt containing a developer is brought into close contact with the latent image forming surface of the photoconductor to remove the latent image. A wet-type developing device for developing an image, comprising: a driving protrusion provided on the circumferential surface of the rotating drum; and an engagement hole provided in the developing belt and engaging with the driving protrusion. Developing device. 2. The driving protrusions are arranged in rows on both left and right sides of the circumferential surface of the rotating drum, and the engaging hole is formed in the shape of a long hole that is inclined inward with respect to the traveling direction of the developing belt. The wet developing device according to claim 1, characterized in that: