JPS58199360A - Recording device - Google Patents

Abstract

PURPOSE:To realize stability of an electrode and saving of electric power consumption, by synchronously moving a rotating body and a toner carrying body, impressing signal voltage to a needle-like electrode, and forming a visible image on the rotating body. CONSTITUTION:The bias is always impressed by an electric powr source 3 in order to hold the constant potential, to the surface part of a rotary drum 1 for forming a visible image, which has a conductive surface part. A roll 2 for carrying a toner is provided by holding a small gap to this drum 1, this roll 2 is provided with a sleeve 6 made of resin, which rotates in the direction as indicated with an arrow, and a magnetic pole N, a needle-like electrode 4 and a destaticizing member 7 are provided on the upper part in the sleeve 6, the opposed part to the drum 1, and the lower part, respectively. Also, a magnetic blade 5 for controlling a toner is provided on the upper part of the outside circumference of the sleeve 6 opposed to the magnetic pole N. The needle-like electrode 4 has a lot of electrode needles 11 arrayed closely at fine and equal intervals, and its tip is made to press-contact with the inside face of the drum 1. Voltage corresponding to an image signal to be regenerated is impressed to each electrode needle of the needle-like electrode 4.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the toner 11! The present invention relates to a device capable of obtaining IIm.

In the Takumi electrophotography method, a corona discharge device and a lI! After forming the Seiden-ichi image using the Ii image processing device, OJ' image is formed using a developer (mainly toner).
I'm trying to get it. In this case, the photoreceptor is lIb11
Due to changes in quality over time and various changes in the environment, the usable life is limited and replacement is required, but this is expensive and the photoreceptor may be damaged. Therefore, there is a problem in that images are distorted.

Makuko Dan's electronic 4-sensor device requires a voltage power source to generate corona discharge, but corona discharge also has drawbacks such as uneven images and poor environmental stability.

One example is a recording device in which an electrical signal corresponding to reproduction is formed as an electrostatic latent scratch on an insulated drum using electrodes, and then converted into a visible image using a developer. Two types of /4 electrodes are required, one for pole and one for development, and due to the processing of the latent image, the concentration of the electric field in the area, and the dirt on the background, there is a difference in the visible image between the electrostatic charge caused by the electrode and the current image. Furthermore, there are problems in that the electrodes become contaminated with toner and dust from the outside, resulting in image disturbances.

The present invention solves such problems and also improves the device l.
It is designed to make the 1tO compact, stabilize the electrode, and save power consumption. and the (b) inversion for forming visible images of drum marriage,
The toner carrying body O rotating body has a toner carrying body which is disposed opposite to the rotating body with a small gap and moves with a thin toner layer formed on its surface, and a large number of electrode needles arranged at fine equal intervals. A needle-like electrode placed on the opposite side of the needle-like electrode, and Ii[I11#! to be reproduced on each electrode needle of the needle-like electrode. II! Li
A control means for applying a voltage corresponding to the law (No. 8) is provided, and a visible image is formed on the rotating body by applying a voltage to the needle electrode during synchronous movement of the front rotating body and the toner carrier. on the recording device.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 11L11. In FIG. 1, 1 is a conductive surface portion Jk4
The drum is a rotary drum for forming a visible image, and the front surface portion thereof may be further coated with an insulating coating. In addition to the drum, the shape may be an endless or an end web.

A bias is applied to the conductive surface of the drum 1 by a t source 3 in order to maintain a constant potential at all times. A roller 2 that carries the toner while maintaining a small gap with this drum 1.
is arranged, and the row 22 is 1'-! I7J is equipped with a sleeve 6 made of oil that rotates in the same direction as the arrow, and inside the sleeve 6, a magnetic pole N1 is arranged in the upper part, a needle electrode 4 is arranged in the part facing the drum 1, and a relaxing part shaver 7 is arranged in the lower part. A magnetic grade 5 for regulating toner is disposed at an upper portion of the outer periphery of the sleeve 6 facing the magnet &N.

Note that the sleeve 6 may have a shoulderless web shape as well as a drum shape.The needle-like electrode 4 has a large number of t-pole needles arranged closely at fine equal intervals as shown in FIG. The tip of the electrode needle faces the drum l and is in contact with its inner surface.A voltage corresponding to the right image signal is applied to each needle of the needle electrode 4. There is. Reference numeral 8 in FIG. 1 is a control means for causing the needle electric insulator 4 to generate a signal voltage corresponding to an image signal. In the figure, 9 is a transfer roller, and 10 is a continuous or cut-shaped transfer material such as plain paper or insulating paper.

To form a visible image with toner on the surface of the drum 10, the toner is transferred from the surface of the sleeve 60 to the drum 1 according to an image signal.
The inertia of the bias applied to the drum 1 by the power supply 3 is of opposite polarity to that of the toner in order to move the toner to the surface of the image. Either a signal voltage is applied to the needle electrode +M4 to create an electric field that promotes the formation of a visible image, or the signal voltage is made to have the same polarity as that of the toner, and the control means 8 generates a relatively strong image having the opposite polarity to that of the toner. A signal voltage may be applied to the needle electrode 4 to create an electric field that promotes formation of a visible image in the body. In the case of a wave imager, an electric field is generated in which the toner moves from the drum 1 to the acicular electrode 4 in the non-image area, and an electric field is generated in which the toner moves from the acicular electrode 4 to the drum 1 in the IIAII image area. The key is to form a toner image without fog.

In the case of & name, a bias having the same polarity as the toner is applied to the drum 1 and the needle electrode 4, but in reality, it is sufficient to apply an intermediate potential between the non-image area and the 1III image area to the drum 1. It turns out.

The roller 2 is coated with a thin layer of toner by a magnetic blade 5 close to the sleeve 6. At this time, the toner generates an electric charge due to friction with the sleeve. The thin layer toner that shoulder this charge is 3! When image No. 48 is inputted when passing over the needle-like electrode 4, that is, the developing position, by 60 rotations, toner is transferred from the roller 2 to the drum 1 between the needle-like electrode 4 and the surface of the drum.
An electric field is generated that moves to , and a visible image corresponding to image No. 46 is formed on the surface of the drum 1.

This toner moving electric field may be generated using the ground side of the bias that is constantly applied to the drum 1 as a signal.

In other words, when the -my partner number is OFF, the needle electrode is a float and the toner on the sleeve 2 does not move toward the surface of the drum 1.
When the IIIt image signal is input, the needle electrode becomes grounded,
An electric field is generated to move the toner from the sleeve 2 to the surface of the drum 1, and a toner image 93 is formed on the drum surface 1 in accordance with the signal. This will be explained with reference to FIG.

Figure 4 (,) is a state where no signal is input, and in seven gals, the switch 15 is open, the needle 11 is electrically floating, and the drum 1 hetner 16 moves from the sleeve 6. No electric field is generated, and the toner 16 is used to rotate the sleeve 6 in a state where it is electrostatically stratified due to the electric charge generated by the 9-day storm between the toner 16 and the sleeve 6. When the gate signal is inputted manually, a closed circuit is formed between the drum 1, the bias, the needle-shaped loop, the three-pin loop, and the gap between the drum 1 and the needle 2, as shown in Fig. 4(b).
The L% toner 16 is moved onto the drum by the charge represented by the acicular charge. In this case, what is wise is the time difference between the gap d1 and the sleeve d, that is, the product of the electric current ε and the resistance ρ. There is a necessity to make the time constant τ2 of the third l smaller than the time constant τl. For this, the material of the three 16 is a conductive member such as force-metal, etc., which is made of a pigeon-wrinkled material.The dielectric constant of the resin, the resistance value is the gap d, the dielectric constant εair, and the resistance value ρ1r.
It is better to make it smaller than the turret.

Further, the resin of the sleeve may be determined based on the electrification series with the toner material, and a resin material having a desired charge may be selected.

FIG. 4(c) shows the state after 3J4111, and as the toner moves one trigram, the three 16 is charged by the electric charge due to frictional electrification with the toner and the electric charge appearing on the needle electrode. It is necessary to erase this charge because it is better to eliminate it at the blade position, that is, when toner coating is performed again, because a more stable toner coating can be obtained.

For this purpose, it is necessary to eliminate static electricity from the outer circumference and inner surface of the sleeve, but a simple method for eliminating static electricity has been difficult. In the present invention, the time constant f3'N is made shorter than the rotation time from the needle electrode position to the grade m in the direction of rotation of the sleeve, and the electric charge charging the sleeve is discharged, and the sleeve becomes uncharged and the blade reach the position.

In the above description, grounding was explained as an image signal, but development 7.1 is the same even if a bias with the same polarity as the toner is used as a signal.
Furthermore, it has further effects such as the ability to strengthen the moving electric field and the ability to control the toner movement in accordance with the signal voltage.

Preferably, the time t1 for the sleeve to rotate from the grade cutting position to the needle electrode position in the rotational direction and the time t1 for the sleeve to rotate from the needle electrode position to the grade cutting position in the rotational direction are sufficient to reduce the gap between the drum and the sleeve. It is preferable that the relationship between the time constant τ1 and the time constant τ of the cross section of the sleeve be as follows: τ1>τg≧tl and = t1 Figure 3 shows another implementation of toner thin J-formation on the toner carrier. This is an example, and the same items as in Figure 1 are indicated by the same eclipse numbers.

A sleeve 13 having a fixed magnet 12 inside is provided facing the row 22, and a member 14' for regulating the W length of the toner is provided on the outside of the sleeve 13. Said sleeve 1
3, a toner brush is formed on the sleeve 13, which is rubbed against the roller 2 to form a thin layer of toner on the row 22.

At this time, the inside of the roller 2 is hollow, but the #! , (magnet or magnetic material) can be provided to stabilize the violet cloth. It is also possible to fix the sleeve 13fr and rotate the magnet 12. In this case, the magnet 12 is rotated in the same direction as the roller 2. In addition,
The transfer of toner from the roller 2 to the drum 2 is carried out in the same manner as in FIG.

In the following examples, the case where - component magnetic toner is used has been described, but the toner is not limited to only that, and in the case not shown in Fig. 3, -m component magnetic toner is used. Non-magnetic toner may also be used. Since the present invention has the above-described configuration, there is no need to worry about using the photoreceptor, and the life of the rotating body of the pf optical system can be extended. Since it does not have any scratches, it does not cause scratches and has excellent image quality.

In addition, since the mechanism is simple, it is possible to make the device compact, and furthermore, it is possible to accommodate the electrodes, magnets, etc. in endlessly rotating members such as the endlessly moving unit, pump, and three. This has the advantage of eliminating stains caused by toner particles and the like, as well as eliminating fluctuations in performance.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the recording iron of the present invention, FIG. 2 is a plan view of the needle electrode, FIG. 3 is a side view showing another embodiment of forming a thin toner layer, Figures (,), (b) and (c) are explanatory diagrams of the l1iII volatile form ht principle in the recording apparatus of the present invention. 1...Visible image forming drum, 2...Developing roller, 3...Constant bias voltage, 4...Developing electrode, 5...Magnetic blade,
6... Sleeve, 7... Static elimination member, 8...
Ili! lt#OI Bias Drowsiness 19...Transfer loan, 10...Transfer material, 11...] Electrode needle,
12...Magne, G, 13...S IJ-1, 1
4...Regulating member/Fig. 4 Fig. 3

Claims (1)

[Claims] A plain rotary body for forming a visible image which vibrates the exclusive electric surface portion and maintains a constant potential on the surface portion, and a plain rotary body for forming a visible image, which is disposed opposite to the rotary body with a small gap therebetween, and a thin toner l- is applied to the surface. a toner carrier to be formed; a nine-needle electrode having a large number of vL electrode needles arranged at equal intervals with fine gaps; and a control element wire for applying a voltage corresponding to one image signal to be formed to each electrode needle, and connects the rotating body and the toner carrier to l! 6. A self-recording device in which copying involves applying a signal voltage to the needle electrode while moving the IJM to form a visible image on the rotating body.