JPS5942568A - Developing device - Google Patents

Abstract

PURPOSE:To simplify the structure of a developing roll and to eliminate the need for high-level work and assembling technique, by using a magnetic material for the outer circumference of the developing roll and forming a specifying member of a magnetized material. CONSTITUTION:The developing roll 9 is made of an iron-made magnetic cylinder 9a and single-component magnetic toner 8 stored in a hopper 2 is supplied to the surface of the cylinder. A magnetic brush 8a formed of the magnetic toner 8 on the surface of the magnetic cylinder 9a is specified to specific thickness by the specifying plate 10 made of a plate magnet during the rotation of the magnetic cylinder 9a and moved as shown by an arrow while attracted to the surface of the magnetic cylinder 9a by its residual magnetic force to develop an electrostatic latent image on a photoconductive sensitive drum 5.

Description

[Detailed description of the invention] The present invention can be used for
j': #, the developing device Icf that can be installed in the device 111, j
゛゛゛ Do 4.

1 is the child photographic device i1 and the static th:recording device, which forms dust on the surface of the recording medium and develops a latent image on this static 1 with a developing device, thereby completing the optical insertion. . Current 1
The spraying device uses a magnetic brush, which is formed by adsorbing the magnetic developer N1 on the surface of the developing roll and regulating the adhesion thickness of the magnetic developer to a predetermined value using a regulating member, to form the magnetic developer on the recording medium. A structure is known in which this magnetic brush is applied to an electrostatic latent image to develop it. The magnet roll has a bar-shaped magnet inside a non-magnetic cylinder, and the magnetic field of the bar-shaped magnet attracts the magnetic powder to the surface of the non-magnetic cylinder.

FIG. 1 is a longitudinal sectional view of such a conventional developing device, in which a developing roll 1 includes a non-magnetic cylindrical body 1a and a rolled magnet 1bk. A single component magnetic toner 3 contained in a hopper 2 is supplied to the surface of the non-magnetic cylinder 1a, and a magnetic toner is formed on the surface of the non-magnetic cylinder 1a by this single-component magnetic toner 3. The thickness of the free air brush 3a is regulated to a predetermined value by a regulating plate 4. The magnetic brush 3a thus formed moves in the direction of arrow (B) as the non-magnetic cylindrical body 1a rotates in the direction of arrow (A). On the other hand, the photoconductive photosensitive drum 5, on which a static latent image is formed, rotates in the direction of the arrow (C), and is developed at a portion near the magnetic brush 3a.

This, 1, problem with JA professional uniform Gyu, non-magnetic 1 and 1
- The same 'D' V roll-shaped magnet is commercially supported in the circle I blind body ia. It is not possible to configure it so that one body can be rotated.It) C, t, 1- is not possible, so the structure is complex and requires advanced processing.
J'fC There are things that need to be done.

The ["of the present invention is that the 11Q structure is a simple one, the eyes, the high + I of the high + I) R11, the group -11, the current four devices that are not required.

The present invention is characterized in that the outer periphery of the raw roll is made of a magnetic material, and the outer circumference of the roll is made of a magnetic material, and
! By doing this, the developing roll bag (shape I on the front side) 1
Shi J-ru (1 severe brush by the current management ♀ (\゛i uniformly)] 7 J'3 (The throat is right, and the current 1-j2
``'-Ru's outside prayer rule! Till bar 1- magnetized with a partner J-
By doing so - Q) Immerse yourself with a sword with no residual energy (℃furashike 1♀ with a monkey 7' here and there)♀i'j:
lnoni. According to this 1), the current 1,1 no roll is 11
′′? The support of success l”-k l'i1・II 1
115 Sashimi・1゛・Stone try processing, set-/shi, stand-
C uki 14;

The following will be explained based on F' L, ζl i'i7. Attachment 12 and FIG.
The perspective view and Figure 3 are I1 side views. In Figure i+ji, the magnetic plate 7, such as a 6 ft.
The eight-balance component toner 18a is a magnetic brush formed on the surface of the magnetic plate 6 by the one-component toner 8. Table 111 of the lower edge fully magnetic plate 6 of the plate-shaped IR stone 7
1, and move the magnetic plate 6 in the direction indicated by the arrow. nf
JR, 4? ? The surface of the sex plate 6 is thinner and more uniform than the gap11. '4', 'j, t brushes 8a are formed. The magnetic brush 8a is connected to the lower edge of the plate magnet 7 and the magnetic plate 6.
The reason why it is thinner than the gap is that magnetic force acts on this gap, which suppresses the one-component a-based toner 8 that passes through the gap. - Rather, the ffa sex plate 6 is this plate-shaped magnet 7.
When it comes close to the edge of the magnetic brush 8a, it is magnetized with a force 1, and residual magnetic force still exists after that, so that it is held on the surface of the magnetic plate 6 by the residual magnetic force of the magnetic brush 8a.

Fig. 4 U One embodiment of the present invention v11 Fully illustrating current device 1.l
FIG. The current roll 9 is made up of a magnetic cylinder 9a made of iron and has a support 1 to rotate in the direction of the arrow (E) with a force of 4! "S11. The surface of the magnetic cylinder 9a with ttM
vc is a one-component magnet 1'I + housed in hopper 2
The one-component magnetic toner 8 is formed on the surface of the magnetic cylinder 9 (magnetic brush 8).
is regulated to a predetermined tightness by a regulating plate IO formed by a plate L-shaped magnet. Formed in this way
The residual magnetic force of the magnetic inner body 9a of the magnetic brush 8a, which is tilted by 1°, attracts its surface V(:), and the magnetic circle VJ 9a rotates in the direction of the arrow (E).
Light guide without moving in the direction 〒14. ' Static r11 of the I-eye optical drum 5: Develop the latent image. The plate magnet constituting the regulating plate 10 is preferably made of ferrite and magnetized so that the maximum magnetic flux density on the surface of the lower edge is approximately 500 to 2000 Gauss. The magnetic cylinder 9a is made of iron and has a total length of 0.
．． When the thickness is about 5 to 2 mm, good magnetic, mechanical, and weight results can be obtained.

FIG. 5 shows another embodiment of the present invention.
i 1til 1 side view, the current 1 Saar 9 is an iron cylindrical body 9
11 in b? It was created. The desired purpose can also be achieved by this.

In addition, the developing roll 9 of the present invention is plated with 3A% by steam so as to uniformly distribute the magnetic material on the surface +f5 of the non-magnetic gold base material 4 or the insulating base material in a thin square or dot shape.
(It may also be configured by dispersing it in a resin and coating it.) Suy
Alternatively, a magnetic material may be dispersed in a resin, and the circular 11' may be formed by molding a one-necked or cylindrical shape.

Further, the regulating plate 10 of the present invention does not need to be a single plate-shaped permanent magnet, and may be made by magnetizing a magnetic plate with a [b] edge for regulating magnetic brushes with a permanent magnet or Alternatively, the same effect can be obtained by magnetizing with a four-magnetic coil excited by direct current.

Further, in order to control the phenomenon characteristics, it is also possible to add means for applying the full effect of an alternating current or direct current electric field or magnetic field to the magnetic brush portion that is close to or in contact with the surface of the light guide 2 and the photosensitive drum 5. In addition, in order to control the rate of development in the first area, magnetic characteristics ff are applied to the developing roll surface +rii.
:A non-magnetic layer can also be formed as long as it does not cause significant damage.

The above-mentioned developing device uses a two-component one-sieve developer which is a mixture of a magnetic carrier and a non-magnetic toner, and a one-component magnetic toner which contains a magnetic substance in the toner particles. Although any type of shaving can be used, particularly good performance is shown in 1-7A liquid using one-component magnetic toner.

As described above, 41: the invention is such that the outer periphery of the developing roll is made of a magnetic phase and the regulating member is made of a magnetized magnetic material, so that a magnetic brush created by a magnetic developer formed on the surface of the current 1ψ roll can be used. By forming the brush to a thin and uniform thickness and magnetizing the outer periphery of the current 1ψ roll at a controlled angle, the residual magnetic force can protect the magnetic brush. This has the effect of making it possible to create a device that has a simple structure and does not require a high level of assembly technology.

[Brief explanation of the drawing]

FIG. 1 shows the conventional phenomenon device n1i4i? Figure 2 is a perspective view, Figure 3 is a side view, and Figures 4 and 5 are longitudinal cross-sections of the developing device according to the present invention. FIG. 5... Photoconductive photosensitive drum, 8... 1-component magnet e-t
Toner, 8a...Magnetic brush, 9...Developing roll,
lO...Regulation Figure 2

Claims (1)

[Scope of Claims] (1) A magnetic coating agent is adsorbed on the surface of the present roll, and the regulating part is used to adhere all the particles (11).
A magnetic brush metal 1fff formed under the control of iN is applied, and the magnetic brush is applied to a static image formed on a recording medium to create an image of the entire image.
The wall roll has at least its outer periphery formed of an RIG material, and the regulating portion (1v) is made of a magnet 1'L (+) and has a groove formed by 1?C'II f=,'<. -jA
+? 't, . 2,! Hemorrhoids
Note 14: A yi image device in which the agent is a one-component magnetic 1' toner.