JPS587165A - Developing device - Google Patents

Abstract

PURPOSE:To eliminate troubles of development defects due to flocculation of developer particles made into a thin layer, by forming an alternate electric field between a conductive member and a developer holding member. CONSTITUTION:When a developing device is operated execute the development on the surface of a latent image holding member 6, a toner layer 51 of the surface of a sleeve which passes through a blade 4 is jumped and moved back and forth in the space between the surface of the sleeve 1 and a the inside face of conductive member 8 by the action of the electric field applied across the conductive member 8 and the sleeve 1 while the toner layer 51 passes through the region of the conductive member 8. By this movement, the toner layer 51 on the surface of the sleeve is agitated uniformly without contacting, and toner particles are released from flocculation, and the occurrence of the irregularity at a low humidity is suppressed; and further, since the toner is brought into contact with the sleeve sufficiently with friction, its loading property is kept well, and vivid pictures are obtained even at a high humidity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention supplies a one-component developer to the surface of an SOB lunar surface, and the developer is thinned using a sharp means. Adjust and hold the developer supporting member surface using the sheet 7, and press the developer thin layer surface to /'
zk By facing the developer holding part 11 with a slight gap of 1'44, the developer supporting part 11 [[IiIMl
7h rare for +'s current army agent to sub-1 area NF i;
7
．． It is a great idea to improve the current 1Y system! J,":L+'
, the developer support member ifr+ until the unit execution process V (-
-, 1- and 17- to eliminate the apparent trouble caused by mutual aggregation of developer particles that are auxiliary layered.
1 target.

-1-Representation of writing type ↓(16
Public Law No. 5, U.S. Patent No. 2,839,400? lf4+1
Document 2: Japanese Patent Application Laid-open No. 54-421.4 related to the applicant's earlier proposal
No. 1/11c: 54 430 Ni 37 month, etc.)
. FIG. 1 schematically shows the groove structure of an example of the single cane body.

(2) is a developer supporting portion I, and a non-magnetic TJ sleeve at 7 is rotationally driven in the direction of arrow a. Reference numeral 2 denotes a magnet roll inserted into the inner space of the sleeve 1, and the magnet roll has both ends fixedly supported by the support portion. 3 is a developer hopper 7 arranged as a ten-stage developer supply supply to the sleeve 1, and 4 is a layer thickness regulating member located at the upper center of the sleeve 1 with its lower side between it and the sleeve surface. A magnetic blade 5 (one-component magnetic developer housed in the hopper 3) is placed close to the sleeve surface while maintaining an appropriate small gap.
(hereinafter simply referred to as toner), 6 is a latent image holding layer 51 formed and held on the sleeve surface of the sleeve 10 on the side opposite to the hopper 3, which passes close to the toner thin layer 51, which will be described later, while maintaining a small gap β therebetween. It is a member. 10 is an insulating member that prevents the toner thin layer 51 from scattering.

Hereinafter, for convenience, the closed area near the sleeve 1 and the latent image holding member 60 will be referred to as a developing section A.

Insertion amount j into the inner space of sleeve 1! L no j fixed magnet roll 2
The magnetic pole 2 (magnetic pole 2 □ ( ] 1 dot), 22 (developing magnetic pole), 23 (transporting magnetic pole), 24
(same) and 2a (same) are arranged.

Therefore, in (a), one ton of the toner 5 stored in the hopper 3 is constantly in contact with the approximately right half-turn of the sleeve l, and toner is supplied to the sleeve, and the toner near the sleeve surface is transferred to the magnet roll 2 in the sleeve. ? It is held on the sleeve surface as a magnetic adsorption layer.

(b) As the sleeve rotates, the toner holding the sleeve surface is transported to the position of the magnetic plate 14, which is a layer thickness regulating member, and in the process of passing through the gap α, the toner is separated from the gap α, the blade 4, and the cut magnetic pole 21. Due to the action of the magnetic force acting during this time, the toner is formed into a thin layer 51 of a uniform thickness and is held as it is on the sleeve surface, and is conveyed to the developing section A by the continued rotation of the sleeve.

(C), then appears] In the quadrant A, the sleeve 1 (11
The retained toner No. 11 is electrostatically transferred in the latent image direction of the latent image holding member 6 by jumping or elongating the gap β in accordance with the latent pattern, and the latent image surface is developed 5! will be done.

(d) A layer of residual toner on the sleeve surface that has passed through the developing section A for 1 Jn. is held as it is on the sleeve surface by the magnetic force of the conveying magnetic poles 23 to 2I, and is returned to the hopper 3 as the sleeve rotates.
The sleeve surface is then resupplied with i-ner.

By (a) to (d), D repeat k L, developing section A
5. Thin layer of toner. The six surfaces of the foil image holding member are continuously developed. Reference numeral 7 denotes a device for applying an alternating current bias between the sleeve 1 and the latent image holding member 6 to improve the reproducibility of the gradation lines of the image (for example, Japanese Patent Laid-Open No. 55-1.8659). reference).

The latent image holding member 6 is, for example, a xerographic photoreceptor in which an electrostatic latent image is formed by a Carlson process.

A photoreceptor with an insulating layer formed on the curve and an electrostatic latent image formed by the NP process (see Japanese Patent Publication No. 42-23910, Japanese Patent Publication No. 43-24748), an insulator with a latent image formed by electrostatic recording method. It is a member on which an electrostatic latent image is formed and retained by a body or other appropriate method, and the image area A of the member 6 is
The surface movement speed and the rotational circumferential speed d of the sleeve 1 are generally set to be approximately the same speed.

According to this method, the toner is supported by the magnetic force, which increases the chance of contact between the sleeve and the toner by applying a very thin layer of magnetic l/toner, and enables sufficient frictional electrification. ~, and by moving the magnet and toner relative to each other, the toner particles are caused to have sufficient friction with the sleeve to disaggregate the toner particles, and the toner is 1
By supporting the electrostatic image with high force and placing it facing the electrostatic image without touching it, fogging can be prevented. When the fluidity of the gel is reduced, the agglomeration of the glue cannot be sufficiently dissolved by magnetic force, resulting in a decrease in image quality and image pain.

Furthermore, in this method, uniform application of toner on the sleeve is extremely important;
There is a drawback that unevenness tends to occur particularly in a low humidity environment.

It is therefore an object of the present invention to provide a method for using insulating toner which does not suffer from the drawbacks mentioned above.

Another object of the present invention is to provide a developing method in which toner has good chargeability and clear images can be obtained even in humid conditions.

Still another object is to provide a developing method that does not cause uneven toner application even in a low humidity environment.

FIG. 2 shows an embodiment of the present invention, and the device of this example is shown in FIG. The member 8 is installed across the entire width of the sleeve in the axial direction. Reference numeral 9 denotes a voltage applying device which applies a bias θiL between the conductive member 8 and the sleeve 1 serving as the developer supporting member.

Then, in the prone state where a father-flow bias voltage of 9 V is applied between the conductive member 8 and the sleeve 1, the imaging device is operated to perform the current dusting on the surface of the latent image holding member ( ). When the toner layer 51 of the sleeve passes through the blade 4, it passes through the area of the conductive member 8 and the sleeve 1.
A reciprocating movement is performed in the gap between the sleeve 1 surface and the conductive member 8 inwardly by the action of the field marked 111 between them. Due to this interlocking action, a single layer of toner on the sleeve surface - H is uniformly stirred with a non-contact seven-layer roller, and the agglomeration between toner particles is broken up. , the appearance of unevenness in low humidity is suppressed, and the toner is packed into the sleeve and the sleeve, and its load and properties are maintained well, and even in high humidity, it is possible to obtain clear tracks. I can do it.

Also, there is a way to achieve the same effect by creating a difference in rank between the blade and the sleeve group, but between the sleeve and the blade? -1
Since this is an area for regulating toner, the gap is densely filled with toner. For this reason, the movement of the toner was limited and its effectiveness was not sufficient. In the second illustrated example, the space in which the toner can move is sufficiently wide,
The intended purpose is well achieved.

In other words, in this type of developer placement, the surface of the developer supporting member passes through the layer thickness regulating member 11 The purpose is to dispose a conductive member closer to the surface of the developer support member in the space F of the developer support member surface movement path, and to form alternating gaps between the conductive member and the developer support member.

As a specific example, in the device shown in @2, the circumferential rotation speed of the sleeve 1 is 250 mrIV/sec, the gap α is 300 μ, the cut magnetic pole is approximately 500 Gauss, the electrode plate is 80 width, the width is 30 mm, and the sleeve 1 is
The distance between the electrode plate 8 and the electrode plate 8 is 0.5 +trm, and the slit 81
Width 4mm, applied AC between sleeve 1 and electrode plate 8, applied AC 3 size copies to 10 (after 100 sheets, no unevenness or density drop was observed, A good toner coding method] temple, gun, 11.
is.

Development used l'TII (toner) r1 polystyrene (
Product name Picolastic I)-125) 100 copies, l1
fi't1. Control dl ill (+<'fi product name Pomelo Firth] Black 13) 2 parts, carbon black (product name Riichigal 40 ++ R)
・500) It consists of 40 parts and has a diameter of 12 μm.

FIG. 3 shows the toner 5 between the sleeves 1 and 2 in the device 6+. All sleeves 1 and floating surface 1'I-, 11XA''8
Inside (rll), the electric current is moved throughout the space in the IIJI gap.At 1., using the current bias (AC bias) 7, conductivity j;i (DC direct pressure to the material 8 and +:l ] J@
It is configured to be the same as the bright section '' of the L drum.
When a direct current of 1 (10 V'c7) was applied to the conductive member 8, -5 (l V) was applied to the conductive member 8, and an effect similar to that of the device V in FIG. 2 was obtained.

Figures 4-0 and 3-3 show the sleeve 17 facing the conductive part 8 and the magnetic pole 26 (the magnetic roll 2 has the magnetic pole 26 installed. Implementation of AiI Figures 2 and 3) A better effect could be obtained compared to the example.

As described above, according to the present invention, in a developing device of this type, the problem of intoxication caused by the deterioration of the developing performance of the sleeve + toner due to the environment described above can be solved in a Q-friendly manner. The objectives of the term are well achieved.

FIG. 5 shows an uninvented practical step 11 using a conductive part 1 and a roller made of aluminum or the like. Because of the decrease in the Yosong of Koreke, a stable effect was obtained when using the Doro. The roller 8 is kept clean by removing toner that adheres to the roller 8, and the electric current applied between the roller 8 and the sleeper 1 is kept constant β.
It was created in four parts. The sifted toner may be returned to the developing hopper or may be returned to the sleeve 1.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional side view of an example of a developing device of a developing type which is an object of improvement in the present invention, and FIG. 2 is a schematic cross-sectional side view. Figures 3, 4, and 5 are schematic lateral cross-sectional views of the apparatus of each embodiment of the present invention. 1st, sleeve (developer supporting member), 2nd is magnet roll,
3Vi developing hopper, 4 is a magnetic blade (layer thickness regulating member), 5 is a developer, 6 is a latent 1 image holding member, 7 and 9 are voltage application devices, 8 (d is a conductive member, 10 is a toner scattering prevention member) I am Toshi Ichibe. Applicant: Gyanon Co., Ltd.

Claims (1)

[Claims] (1) Supply a one-component developer to the surface of the developer support member, apply the developer as a thin layer using the layer thickness regulating member, and hold the developer support member (O [Hl at y, p7.+), Zono) 1! , 1'f
By making the developer thin layer and full layer face each other with a slight gap between them on the holding member surface, the developer on the developer support member surface is moved toward the latent image holding member toward the ih1 and <z1 turns. In the name of a developing section in which a latent image is developed by rolling the latent image, the developer supporting member surface passes through the layer thickness regulating section side and faces the latent gap receiving Fji.1 material. Transferring the surface of the developer support member up to the point! IIIJ 7 A conductive member is provided in the sieve passage in opposition to and close to the IA surface, and a mutual electric field is formed between the conductive member and the developer support member.
This is the current 1'M8 device.