JPS58223158A - Developing device - Google Patents

Abstract

PURPOSE:To enlarge freedom of design of a device and layout, by arranging a container bag of a developer made of a flexible thin film with its opening opposite to the face of a developer holding member and pressing the developer in the bag to the surface of said member. CONSTITUTION:A toner 7 is packed in the bag 6 against its elasticity, and when the bag is swollen greatly downward in a housing 10, the toner 7 in the bag 6 is in contact with the surface of the developing roll 5 and the surface of a coating roll 8 opposite to the opening 61 of the bag 6 and the toner always presses said surfaces by the elastic contraction force of the bag 6. The toner 7 is carried to the developing station A of a drum accompanied by the rotation of the roll 5 to develop a latent image. As the toner 7 in the bag is consumed, the bag 6 gradually shrinks, but the contact pressure of the toner to the surfaces of the rolls 5, 8 is kept almost constant by the elastic contraction force during the course of decrease due to consumption of the toner 7. Hence, the developer can be supplied from an optional direction without trouble, thus permitting enlarging freedom of design of a device and its layout.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrical latent image (silver 11L residue image,
This relates to a device for dry powder development of potential images, magnetic latent images, etc., and uses a one-component developing agent as the developer (-
The present invention relates to a developing device using a component development method.

In recent years, a -component developing system has been widely adopted as a developing device for dry type PPC copying machines (plain paper copying). In this development method, a one-component developer is formed and held as a thin layer of approximately uniform thickness in each part on the surface of the developer carrying member, and the thin developer layer surface of the member is placed on the surface close to the holding surface of the cap 1u, which is the member to be developed. The latent image is visualized by selectively transferring the developer in the thin developer layer to the latent image-bearing surface side in correspondence with the m-image pattern by bringing the developer into light (contact with the thin developer layer). The component development method is compared to the conventional development method that uses a two-component developer composed of toner and carrier.

Since there is no need for a stirring mechanism or the need to measure the concentration of the developer, there are various great advantages such as not only the device can be made smaller and lighter in weight, but also the developer does not require labor.

The developers used in the one-component development system include (If) a magnetic component developer (If) made by uniformly mixing a resin component, magnetic component 1 & crushed magnetite; There are two sides of non-magnetic-component developer.

In the case of the above-mentioned magnetic component developer, by using a developer carrying member with a magnet inside, the developer supplied to the surface of the member is held as a magnetic adsorption layer, and furthermore, the developer magnetically The adsorption layer is made into a thin layer with a thickness of 791 mm, and is applied to the surface of the image carrier by absorbing it and holding it on the surface of the member.In other words, the developer is placed near the surface of the IS agent-supporting member. If the developer is supplied, the developer will easily adhere to the surface of the member and be held in a no-shape due to the magnetic attraction force.Therefore, there will be a gap in the direction in which the developer is supplied to the member. Cut it into a member and top that lawn or 19 or from 1jlk.

Alternatively, the developer can be supplied from below and adhered and retained in a layered manner, providing flexibility (freedom in design) in the design of the developing device itself and the arrangement 11 within the copying machine.

However, because the magnetite itself, which is blended as a magnetic component, has a unique color of black or brown, it is necessary to manufacture a developer for normal black copying, but it is a pure developer for color images. It is not possible to make cyan, magenta, and yellow color developers. Also, even if you mix the colors of each developer when the two painting squads are used, the ground color of the magnetite will come out.
You can't expect the original perfect locus color H appearance.

In the case of the non-magnetic component developer (II), contrary to the above, the developer is made of only 8FI components, so pure cyan, mazemme, and yellow color developers for color images are used. It has the advantage of being easy to make.

However, the formation of a thin layer of developer on the surface of the developer carrying member
Erasing cannot be performed using magnetic attraction force as in the case of the above-mentioned magnetic-component developer, and in this case, the developer must be supplied while always being in contact with the surface of the developer carrying member with a substantially constant pressing force. Due to the interaction of Coulomb force or van der Waals force due to the thin layer of developer material on the surface of the developer carrying member, a thin layer of developer material is formed on the surface of the developer carrying member. P-Ra A form is adopted in which it is attached and retained on the tree surface. For this reason, the direction in which the developer is supplied to the surface of the image material carrying member is limited to some extent, and some ingenuity is required in the supply force method. Therefore, the durability of the developing device itself and the degree of freedom given to the design of the plate copying machine are limited accordingly.

The present invention is the color 11 of the above-mentioned flower! Regarding a developing device using a non-magnetic developer which has the advantage of making it easy to prepare a developer, the supply of the developer to the surface of the developer supporting member is carried out at a rate of -11 iV of the former magnetic developer. In almost the same way as in the case of the agent, we have engineered it so that it can be supplied from any direction without any problems.
``t'' makes a big statement about the current deviation of dt's direct course change and layout.

RIJ also arranges an 81 drug storage bag made of an elastic thin film with the opening facing the developer carrying member, and stores the developer in the 7 bag against the 51 characteristics of the station. The gist of the present invention is a developing device which is characterized in that the developer in the bag is supplied by being brought into pressure contact with a mechanical developer carrying member curved surface using a final collection force.

The one shown in the diagram below! This will be explained in terms of J4t+ based on an example of Ab=.

In FIG. 1, reference numeral 1 denotes a drum-shaped photosensitive body (hereinafter simply referred to as drum) as a latent image carrier, and the outer peripheral surface of a metal drum 2 is coated with light such as CdS-Se, opc, ZnO, etc. This is a photosensitive material made of a tetraelectric substance. A image forming process equipment, a transfer device, a cleaning device, etc. are arranged around the drum 1, but these are omitted from the figure. Then, the drum 1 is driven to rotate in the direction of the hour hand indicated by the arrow, and an electrostatic latent image is formed on the circumferential surface of the drum 1 by the action of the drum forming process controller. 1 is a developing device according to the present invention for visualizing images. Reference numeral 1o denotes an exterior housing of the developing device, which is a horizontally elongated case with approximately the same length as the drum 1. 5 is a developing device placed horizontally on the upper left side of the drawing in the Hakuji/G 10 and exposed to the outside through a horizontally long window hole 101 formed by dripping the left side of the cow surface on the upper left side wall of the housing parishioner in the longitudinal direction of the side wall. This is the current @p-ra as a drug-carrying member.

The developing roller 5 has approximately the same length as the drum 1, and is rotatably supported by bearings at both ends of the drum 1, and is driven to rotate in the counter-hour direction as indicated by the arrow (the drive mechanism is shown in the figure). omission).

The roller material is made of a material such as metal, resin, or ceramic, and the second surface of the roller is provided with numerous small irregularities of about several μ/n in order to promote the adhesion of toner. .

6 has an opening s61 on the lower right side of the developing roller 25.
It was placed facing the. The present hardening agent storage screw is made of #fA, a strong and elastic material that is highly elastic and elastic, such as rubber.

It is a horizontally long bag having approximately the same length as the developing roller 5. Reference numerals 11 and 12 are opening locking members that lock the edge of the opening 61 of the bag 6 to keep the opening open. 7 is a bag inside 6! Figure 1 shows a non-magnetic component source agent (hereinafter referred to as toner) that is packed and stored against the elasticity of the bag. 11 indicates a state in which the housing 10 is expanded downward (inflated).

Reference numeral 8 denotes an applicator roller disposed at the diagonally lower right side of the developing roller 5 so as to be in contact with the surface of the developing roller and to enter into a pool of toner 7 stored in 8B. For this application, an elastic roller made of sponge, rubber, etc. has a length dimension that is approximately the same as that of the developing roller 25.

Both ends are rotatably supported by bearings parallel to the center roller 5, and are rotationally driven in the counterclockwise direction as shown by the arrow.
(The mechanism is omitted from the figure) 9 is a frictional electrical member whose tip is in contact with the approximate center of the right side of the developing roller 25, and has approximately the same length as the developing roller 25. . Reference numeral 16 denotes a holding plate to which the frictional charging member is attached.

Reference numerals 14 and 15 indicate toner consumption reduction detection units/f consisting of a 2nd ring and a 7th sensor installed facing each other at approximately the center of the inner surface of the longitudinal left side wall and the right side wall of the housing 10. When there is enough, the bag is stretched and inflated 6
The optical path between the 27g 14 and the 7nat sensor 15 is blocked and no signal is output.

The above is the main structure of the developing device 4.
The developing roller 5'f, which is exposed to the outside, is arranged parallel to the drum 1 and close to it with a small gap d.

The elastic membrane bag 6 containing the toner always carries the toner 7 through the developing roller 2 facing the opening 61 due to its elastic force.
Generates a force for pressing contact on the 5th side and the m-grain -28 direction -3
-ru.

When the developing roller 5 and the cloth roller 8 are driven in the directions of the arrows for development, the toner in the vicinity of the roller is fluoresced by the rotation of the applicator roller 8, and the fluoresced toner is transferred to the developing roller. Coating layer is applied to 25 sides.

Also, the m cloth roller 8 and ll! The toner is applied to the surface of the row 25 between the contact members 9 by the toner pressing contact force that crystallizes due to the contractile force of the bullet 6. Next, the price distribution of 70 roller 5 passes through the next M# layer 9 position, and the excess layered toner is scraped off and made into a thin layer. Due to friction with 9, the number of caps increases.

The excess toner that has been evacuated by the member 9 is evacuated into the bag 6 and returned.

The toner gold layer 7 on the developing row 25 surface where the above J41 Yukata 1 was passed through the member 9 position and layered into a thin layer, and the amount of Teikado was increased.
1 is a member to be developed, which is rotated in parallel with the rotation of the roller 5, and the M approach part (developing part) with the drum 1 is rotated.
In humans, the toner in the toner layer 7o selectively migrates and adheres to the first side of the drum due to the force of air attraction in accordance with the t-shape pattern, and the M image of the drum 11h is formed. Ru.

The first layer of toner 72 that was not used for development is rotated by 50 rotations of the roller. Once with a sliding contact force of 28,! j! f from the s roller surface
The entire trough in the fl gland direction is scraped off. Subsequently, the toner is applied and adhered to the roller surface again by the application roller 8 using a toner suppressing contact force based on the generating force.

Then, one layer of applied toner of '(+) is layered by member 9 and goes around to refill A, which is repeated in a continuous cycle.
Successive development of the surface is performed. The PfraW memory or ghost image is erased by scraping off the residual toner from the surface of the current 1M row 25 by the application roller 8 described above.

The toner in the bag 6 is gradually consumed and reduced by being subjected to development. As the toner consumption decreases, the soft 6 gradually shrinks. As a result, in the process of reducing the amount of toner in one bag 6, the soft white toner is applied to the eye acupuncture row 25 surface and the applicator roller 8 at the bag opening 61 based on the elastic contraction force of the bag.
The pressing contact force is always maintained at a substantially constant pressure.

As the toner consumption continues to decrease, the soft tA 6 is pruned, and the bottom of the bag is near the lower curve of the coating a roller 8 as shown in the second figure. When the light source 14 and the sensor 15 have the same number of optical paths, the light from the light source enters the sensor 115, indicating that the amount of toner remaining is low. comes out.Stiffness/No. 16 ￥ Father's note of toner supplement ml; French 1g-
Issue a signal, or float the machine's quadruple rotation.

The toner can be supplied to the table 6V3 from the side of the developing device 4 (the end surface I11 of the housing 10). It is also not possible to cut the material 12 and perform it from above.

Figure 6 shows another example.
The developing roller 5 in the illustrated example is an intermediate roller 16, and a coating roller 28 and a thick coating roller '1i are applied to the circumferential surface of this intermediate roller 16.
A toner alignment/m71 is once formed using the rs material 9, and the developing roller 5 is placed in parallel contact with the intermediate roller 16.
Aw! One layer 71 of toner from the intermediate roller l5illlJ is applied to the surface of the roller 25, and one layer 73 of toner from the developing roller 25 is applied.
The toner particles are applied to one surface of the drum, which is the surface of the latent image carrier, thereby increasing the uniformity of the toner particles formed on the developing device 25. 17 is the polishing plate that was brought into contact with the developing roller 25 surface! 1i charging member, 18 is development department person! Felt, sponge, and 4IN fat film are used to erase the memory on the surface of the developing roller 25.

It is a memory erasing member made of gold J14 foil. The other configurations are the same as the apparatus shown in FIGS. 1 and 2.

As described above, the present invention provides a means for supplying the dry component developer 7 to the developer carrying members 5 and 16.
A developer storage device 6 made of an elastic V film is disposed with an opening 61 facing the developer storage device 6, and the developer 7 is packed and stored in the bag against the elasticity of the bag. This is because the developer 7 is supplied while being pressed into contact with the surface of the developer carrying member by the confining force of the bag 6.

The developer carrying member 5 constantly carries the developer even when the consumption of the developer is reduced.
- It can be brought into a state where it is brought into contact with 16 surfaces with a substantially constant pressing force. As in the device shown in the example, toner replenishment can be performed not only from below the developing roller 25 and intermediate roller 216, which are developer carrying members, but also from above the developing roller 25 and intermediate roller 16, or from the side. However, since replenishment can be performed, the shape of the developing device 4 and the arrangement of the image selector 4 with respect to the photosensitive drum 1, which is an image carrier, can be freely selected.

Furthermore, since a constant suppressing force is always applied to the toner, no crosslinking phenomenon occurs that impedes toner replenishment.

As described above, the present invention provides a developing device i1 using a non-magnetic component developer.
Is there anything effective as a component C? It can also be used as a developer supply system and structure for a developer carrying member in an image forming apparatus using a magnetic component developer.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the present invention in which toner is sufficiently stored, Fig. 2 is the same view in which toner consumption is reduced, and Fig. 6 is another embodiment. A cross-sectional side view of the device. Reference numeral 1 denotes a photosensitive drum as a latent image bearing member, b and 16 denotes Gengen Oki' 2 or an intermediate roller as a perforated member, 6 denotes a selection agent storage bag made of an elastic film, and 7 denotes a developer.

Claims (1)

[Claims] (1) Dry-component developer is supplied to the surface of the developer-carrying member to form and hold it as a thin layer of approximately uniform thickness for each group, and the thin layer of developer is applied to the surface of the electric AM carrier, which is the member to be developed. m1# by approaching face to face or making contact! In a developing device for visualizing the image, a developer storage bag made of an elastic film is arranged with its opening facing the developer carrying member, and the developer is packed into the bag against the elasticity of the bag. The developer in the bag is supplied by being pressed into contact with the surface of the developer carrying member by the contractile force of the bag. :Developing device expressed as a percentage.