JPS62170987A - Developing device for copying machine or the like - Google Patents

Abstract

PURPOSE:To arrange a developing part and a feeding part in parallel with each other to reduce the whole height of a developing device and to reduce the size and thickness of the device by arranging a developer feeding part for feeding the developer to the developing part from the horizontal direction on the back of the developing part. CONSTITUTION:The developing device body 2 is constituted of the developing part 3a whose electrostatic image carrier 1 side is opened and a lateral housing 3 consisting of an almost cylindrical developer feeding part 3b connected unitedly with the back of the developing part 3a. When a developer cartridge 7 is inserted from the driving gear 9 side into the feeding part 3b, the driving gear 9 is engaged with a driving system gear a part of which is arranged in the feeding part 3b, a developer feeding member 8 is rotated in the arrow direction and the developer in the developer cartridge 7 is fed from a discharge port 7a to the developing part 3a through an aperture part 3d.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an electrostatic latent image formed on an electrostatic latent image carrier.
-Relating to a developing device such as a copying machine that performs development using component developers.

2. Description of the Related Art A developing device such as an electronic copying machine that develops a latent image formed on a electrostatic latent image carrier through an exposure process into a visible image uses a two-component developer consisting of a carrier and a toner. Developing apparatuses using a one-component developer consisting only of toner are well known, and recently, developing devices using a one-component developer with less developer deterioration have been widely adopted.

Further, as a developing device using a -component developer, for example, one described in Japanese Patent Application Laid-Open No. 60-53975 is known. As shown in Figure 5, what is described in the above publication is as follows:
A developing roll b is disposed opposite to an electrostatic latent image carrier a charged to have a surface potential of 200 to 900 r with a gap of 100 to 400 μm. The developing roll b has a surface of the developing electrode (core) C with a thickness of 1 mm and a specific resistance of 1×10 Ωm.
, coated with a surface layer d made of phenolic resin containing carbon and glass fiber with a dielectric constant of 3.0, and the surface roughness is R21 according to the JIS 10-point average roughness.
-1011m.

The developing roll b is a hopper containing a one-component developer.
The electrostatic latent image carrier a is provided near the bottom opening f of the electrostatic latent image carrier a.
The developing roll b is rotated in the direction of the arrow at the same circumferential speed as the developing roll b, and a supply roller which supplies the developer in the hopper to the developing roll b is located near the developing roll b at the same circumferential speed as the developing roll b. It is installed to rotate in the direction of the arrow. The supply roller is in pressure contact with the developing roll b, and in order to reduce the load applied to the developing roll b during pressure contact, the supply roller is constructed by coating the surface of a foam such as urethane with a thin layer of EPDM rubber or the like. 200μm height on the surface
A large number of concavities and convexities are provided at equal intervals of 15 degrees, and these act as traps so that the developer accommodated in the concave portions is supplied to the developing roll b as the roller rotates. The developer sent to the developer g1 roll b is adsorbed by the developer roll b and reaches the regulating member provided above the opening f of the hopper C.
After being formed into a uniform thin layer of ~1.01197 mm, it reaches the electrostatic latent image carrier a and is developed.

Problems to be Solved by the Invention In the developing device of a copying machine or the like configured as described above, the developer in the hopper g having an open top is supplied to the developing roll b by the supply roll l, and the developing roll b collects the electrostatic latent material. The electrostatic latent image on the image carrier a is developed and developed, and the hopper e has a large capacity because it secures a sufficient amount of developer and utilizes natural falling. It has a vertically elongated shape.

For this reason, it is difficult to use the above-mentioned developing device in, for example, a thin copying machine, etc., and the developer must be replenished in a timely manner, which is not only troublesome but also takes time and effort. .

This invention was made for the purpose of improving the above-mentioned problems.

Means and action for solving the problem The electrostatic latent image formed on the surface of the electrostatic latent image carrier by the exposure process is formed on the surface of the developing roll by a regulating member provided so as to be in circumferential contact with the developing roll. In a device that develops a visible image using a thin layer of a one-component developer, a developer supplying section is provided behind the developing section having the above-mentioned developing roll and regulating member to supply the developer from a horizontal direction to the developing section. As a result, the developing section and the supply section are arranged side by side, thereby reducing the overall height of the developing device and making it possible to install it in small and thin copying machines.

! ! Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 4. In the figure, reference numeral 1 denotes an electrostatic latent image carrier installed in the main body of a copying machine (not shown), which is rotated at a constant speed in the direction of the arrow by a drive system (not shown). A main body 2 of this apparatus is installed near the latent image carrier 1. The main body 2 is an electrostatic latent image carrier 1
It is a horizontally elongated housing 3 consisting of a developing section 3a with an open side and a substantially cylindrical developer supply section 3b connected integrally with the developing section 3a at the rear of the developing section 3a, and is a molded product of ABS resin material. It is configured. An electrostatic latent image carrier is introduced into the developing section 3α of the housing 3 through the opening 3C! A developing roll 4 adjacent to the developing roll 4 with a gap therebetween, and a supply roll 5 located behind the developing roll 4 and pressed against the developing roll 4 are housed so as to be freely rotatable in the direction of the arrow) by a drive system (not shown). has been done. The developing roll 4 has a roll core 4a made of stainless steel with a wall thickness of 1 ws and a specific resistance of I × l O.
Qcm.

It is made by conductively bonding phenolic resin with a relative dielectric constant of 20 and added with glass fiber, etc., and the outer diameter is +
50φ, and this developing roll 40 roll core 4a receives direct current! A developing bias power supply in which a high frequency alternating voltage of frequency 2ffz1 voltage 2000 V is superimposed on voltage -300 V is applied.
In this example, an elastic roll 5b made of foam such as urethane is provided on the rotating shaft 5a, and the surface of the elastic roll 5b is
- It consists of a diameter of approximately 15 mm covered with a surface layer 5C of EPDM rubber etc. of 1 mm, and the surface layer 5C has irregularities with a height of about 200 pm and rotates at intervals of 15 degrees around the rotation axis 5a. A large number of rollers are provided in the direction, and the developer supplied from the supply section 3b (described later) to the developing section 3a is transferred to the developing roller 4.
−＼It is designed to supply.

On the other hand, an opening 3 with a width of 5 to 30 m is located between the developing section 3a that accommodates the developing roll 4, etc., and the developer supply section 3b.
d, and a developer cartridge 7 on the front side (in FIG. 1) can be inserted into and removed from the supply section 3b. The developer cartridge 7 has a cylindrical shape, and contains a one-component developer therein.
A discharge lower a, which is approximately the same size as the opening 3t, is opened at a position that matches the opening 3d when inserted into the supply section 3b.

Further, the cylindrical portion of the developer cartridge 70 has a thickness of 0,
The end plates 7 on both end faces of the cartridge 7 are made of 8ttm thick paper.
b is made of plastic.

Such a member is inexpensive, easy to manufacture, and has sufficient durability. Furthermore, by coating the inner surface of the cylindrical part with acrylic resin, leakage of developer from the joint part can be prevented. It can improve moisture resistance and moisture resistance. The cylindrical portion may also be made of plastic or metal. In this case, the cost may be somewhat high, but the durability may be improved.

In the IJ joint 7, a developer supplying member 8 is housed, whose both ends are rotatably supported between the centers of the end plate 7b. The developer supply member 8 is
As shown in FIG. 4, there are rotating shafts 8a made of stainless steel with both ends bent into a substantially crank shape, and these rotating shafts 8a.
The feeding portion 8C is made of a nylon pipe or the like and is inserted into the continuous portion 8b of the developer cartridge 7. As the rotating shaft 8a rotates, the feeding portion 8C is rotated along the inner circumferential surface of the developer cartridge 7. It has become so.

Further, a drive gear 9 is provided on one end side of the rotating shaft 8a, and when the developer cartridge 7 is inserted into the supply section 3b from the drive gear 9 side, a portion of the drive gear 9 is inserted into the supply section 3h. The developer supplying member 8 is meshed with a gear (not shown) of a provided drive system, and the developer supply member 8 is moved from 5 to 30' by the drive system.
The developer cartridge 7 is rotated at a speed of F in the direction of the arrow.
The developer inside is discharged from the lower a to the developing section 3 through the opening 3d.
It is designed to be supplied to a.

Further, although the opening 3d and the discharge lower a have a substantially matching size, it is also possible to adjust the opening width by rotating the rotation angle of the developer cartridge 70 to the left or right.

In the figure, reference numeral 10 denotes a remaining amount detector that counts the number of revolutions of the developer supply member 80 and detects the amount of developer remaining in the developer cartridge 7 accordingly. The developer supplied to the developing section 3a by the developer supplying member 8 is dropped onto the supply roll 5, and as the supply roll 5 rotates, the gap (0.5 to 2 simple)
The toner is compressed and stored in a recess formed on the surface of the supply roll 5 and sent to the developing port 4. Since the developer sent to the developer roll 4 appears to be positively charged due to frictional electrification, it is attracted to the developer roll 4 which is biased with a negative charge, and is attracted to the regulator attached to the opening edge 3e above the developer roll 4. Part 1
Reach 1.

The regulating member 11 is made of stainless steel (SUS 304 CPS 3/4) whose one end side is fixed to the opening edge 3C, and the tip of an elastic plate 11α with a thickness of 0.1 cm is made of silicone containing 1 weight percent of main vanadium oxide. Thickness la made of rubber
+ regulating part +1A glued together with a width of 10 mm, 50 ~
It is pressed against the developing roll 4 at a pressure of 300 f/-, and as a result, the surface of the developing roll 40 has a thickness of 0.5 to 0.8
A uniform thin layer of η/C- is formed.

The thin layer of developer formed on the surface of the developing roll 4 forms the electrostatic latent image carrier 1 with electrostatic latent scratches formed on the surface due to the exposure process.
reached I 50 wn/! in the embodiment 1.0 to 2.5 times faster than the electrostatic latent image carrier 1. The electrostatic latent film on the surface is developed by the developing roll 4 which is rotated at ac).

Further, the developer that has been completely developed is stored in the opening R at the bottom of the developing roll 4.
Lower baffle 12 and lower seal 13 provided at 3f
, and is collected into the developing section 3a and used again.

The lower seal 13 is made of a plastic sheet with a thickness of 30 to 200 μm, and one end thereof is lightly pressed against the surface of the developing roll 4 due to its own elasticity, and serves as a trap to prevent the developer in the developing section 3a from leaking to the outside. ing.

Furthermore, by using a material whose charging polarity for the lower seal 13 is higher than the charging polarity of the developer in the triboelectric charging hierarchy, it was possible to improve the ghost phenomenon that occurs after copying a solid black image. To give a specific example of this, when polyimide of positive polarity was used as the elastic sealing member of the developing device and a developer of positive polarity containing a quaternary ammonium salt was used as the developer, a good copied image without a ghost phenomenon was obtained. I was able to get it. Similarly, when the developing device was used for a negative polarity developer, the lower seal 13 was a negative polarity Teflon material, and the developer was a negative polarity developer containing an alloy metal dye, a good copy image could be obtained.

Further, although the present invention has been described with respect to a non-extractable component developing device, it is of course possible to use the present invention in accordance with a magnetic component developing device.

Effects of the Invention As described in detail above, the present invention provides a developer supply section behind the development section that develops the electrostatic latent image formed on the electrostatic latent image carrier, and supplies the developer to the developer supply section. Since the developer is supplied to the lower part of the hopper, the height of the entire developing device can be significantly reduced compared to a conventional system in which the developing part is provided at the bottom of the hopper. As a result, it can be easily installed even in a small and thin copying machine, and since developer can be replenished from the side of the supply section, developer replenishment work can be carried out efficiently in a short time.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG. 1 is a longitudinal sectional view;
The second factor is a perspective view of the developer cartridge, FIG. 3 is a sectional view thereof, FIG. 4 is a perspective view of the developer supply member, and FIG. 5 is an explanatory diagram of the conventional method. 1 is an electrostatic latent image carrier, 3a is a developing section, 3b is a developer supply section, 4 is a developing roll, and 11 is a regulating member.

Claims (1)

[Claims] The electrostatic latent image formed on the surface of the electrostatic latent image carrier 1 by the exposure process is controlled by the one-component developer formed on the surface of the developing roll 4 by the regulating member 11 provided so as to be in circumferential contact with the developing roll 4. In a device that develops with a thin layer, a developing section 3a is provided behind the developing section 3a that accommodates the developing roll 4.
A developing device such as a copying machine, which is provided with a developer supply section 3b that supplies developer from the horizontal direction.