JPS6194772A - Gap-maintaining method for electrostatic recorder - Google Patents

Abstract

PURPOSE:To prevent a needle electrode and dielectric body from being abraded and prevent toner contamination from occurring at a discharging part, by a construction wherein a magnet is fitted to a head part comprising a needle electrode for recording, and the magnetic is magnetically levitated from a dielectric body for forming a latent image. CONSTITUTION:The magnets 3, 3 for levitation are fitted to the head part 2 comprising the recording needle electrode 1 of an electrostatic recorder, and are contained in a holding and adjusting member 4 fitted with a position- adjusting screw 10. There components are opposed to a dielectric belt 5 for forming a latent image, and back magnets 7, 7 for levitating the magnets 3, 3 are provided on the back side of a backing roller 6 which supports the belt 5.

Description

Detailed Description of the Invention [Field of Industrial Application] This invention relates to an electrostatic method that forms an electrostatic image on a dielectric material using a digitized image signal from a printer, f/millimeter, etc. to obtain a recorded image. The present invention relates to a gap maintaining method for keeping a constant gap between a recording needle electrode and a dielectric material in an electrographic recording device.

[Conventional technology]

In recent years, various electrostatic recording apparatuses have been proposed in which a recorded image is obtained by forming an electrostatic image in accordance with image information on a dielectric material having a constant resistance value and developing it.

By the way, in order to form a proper electrostatic image in such an electrostatic recording device, it is necessary to: It is generally required to maintain a distance of several microns between the body and the body.

Therefore, in order to form and maintain such a high-precision gap, for example, as shown in Figure 4(a), as shown in FIG. Attach the tip discharge part (di) of the recording needle electrode tel to the tip of the head part (bl), and attach the tip of the recording needle electrode tel to the tip of the head (bl).
a), or as shown in Figure 4 (bJ), the central part of the tip of the head (f) facing the dielectric (e) is depressed by a predetermined gap (D+). The recording needle electrode (GL) is formed in a concave shape, and the tip discharge part (HL) of the recording needle electrode (GL) is attached to the recess, and the necessary gap is secured by a method such as directly contacting the tip of the recording needle electrode (GL) with the surface of the dielectric TE1. There is.

[Problem that the invention seeks to solve]

However, in such a method, the dielectric material and the recording needle electric fence are in direct contact with each other. If the convex part of a) is worn out and the specified gap (D+) cannot be secured, or toner etc. remains in the concave part of the dielectric (Al).
It may become stuck and cause problems such as uneven discharge.

In addition, in the latter method, the toner adhering to the dielectric material (e) during development remains even after passing through the transfer/cleaning section and enters the recess of the head section (f), causing the toner to adhere to the recording needle electrode (g). The distal end discharge portion (h) of the device may be contaminated and similar troubles such as uneven discharge may occur.

[Means and operations for solving the problems] That is, the present invention provides an electrostatic recording device that obtains a recorded image by forming an electrostatic image on an electrostatic body using a recording needle electrode or the like according to an image signal. A floating magnet is attached to the head section to which the recording needle electrode is attached, and the head section is displaceably attached to a holding adjustment means provided near the dielectric body, and the head section is displaceably attached to the holding adjustment means provided in the vicinity of the dielectric body. A regulating means for regulating the dielectric at a certain position is installed on the side, and a back magnet is provided near the regulating means, the same pole side of which faces the opposing magnetic pole of the floating magnet, and the head part is The gap between the tip discharge part of the recording needle electrode and the dielectric body is adjusted and maintained constant by floating above the dielectric body. A repulsion magnetic field is formed between the opposed magnetic poles of the levitation magnet, which is displaceable, and the levitation magnet levitates upward due to magnetic repulsion, and the holding adjustment means attaches the levitation magnet. The above-mentioned head part is held at a fixed position, and the gap between the tip discharge part of the above-mentioned recording needle electrode and the above-mentioned dielectric body is kept constant and adjusted so that there is no contact between them. It is possible to prevent toner contamination of the discharging portion at the tip of the recording needle electrode and wear of the dielectric material, and furthermore, the gap therebetween can be easily adjusted.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

1 and 2 show an electrostatic recording device to which the gap maintaining method according to the present invention is applied, and this electrostatic recording device is equipped with a recording needle electrode (1) that generates ions. a floating magnet (3) attached to the head section (2), a holding adjustment member (4) for holding and adjusting the position of the head section (2), and the recording needle electrode ( 1) etc., a 56-electroelectric belt (5) on which an electrostatic image is formed, a packing roll (6) that presses against this dielectric belt (5) from the inner side, and a circular part of this packing roll (6). It consists of a back magnet (7) provided at a position facing the floating i-stone (3).

A large number of the recording needle electrodes (1) are provided along the width direction of the dielectric belt (5) as shown in FIG.
A certain appropriate gap is maintained between the tip discharge portion (1a) of the recording needle electrode (1) and the dielectric belt (5).

A pair of floating magnets (3) are provided along the width direction of the dielectric belt (5) so as to sandwich the recording needle electrode (1), and each of the floating magnets (3) is provided with an opposing magnetic pole (3a) of a large number of magnet groups.
) are arranged so that they are of the same type as the opposing magnetic poles (7a) of the back magnet (7).

The holding adjustment member (4) has an insertion hole (8) into which the head portion (7) made of a non-magnetic material and has the recording needle electrode (1) attached thereto is inserted. The cross section is formed into a U-shape so that the belt (5) is stretched horizontally. This holding adjustment member (3) is provided with an air vent (9) in the center of the upper part, and the air sealed in the insertion hole (8) is compressed to prevent unnecessary air pressure from being generated. In addition, a fine adjustment screw 00) is attached near the air vent (9) to finely adjust the floating position of the head portion (7). The upper side of the fine adjustment member (4) is fixed to the machine body (not shown), and the lower side is fixed to the rotating shaft (1υ) of the packing roll (6).
is attached via a bearing.

The dielectric belt (5) is made of a belt-shaped dielectric material having a constant resistance value, and is stretched around a pair of drive rolls α2 (12) to rotate and move at a constant speed. Near the outer periphery of the dielectric belt (51), in addition to the head portion to which the recording needle electrode (1) is attached, a developing device (
131, a transfer device (14+), a cleaning device (15), etc. are arranged, and the electrostatic image on the dielectric belt (5) formed by the recording needle electrode (υ) is developed by the toner in the developing device 0J. The device is configured such that transfer, cleaning, etc. are performed after that.Although a belt-shaped dielectric is used in this embodiment, the present invention is not particularly limited to this, and a drum-shaped dielectric is used. It is possible if the same effect can be obtained on the body.

The packing roll (6) is a pair of driving rolls α2
1 (The outer circumferential sleeve (6a)
is configured to rotate, and the dielectric belt (5)
The conveying force causes the sleeve (6a) to rotate and restrict the dielectric belt (5) to a fixed position. Note that the sleeve (6a) is the head part (4).
The recording needle electrode (1) constitutes a counter electrode to the recording needle electrode (1).

The back magnet (7) is a pair of fixed magnets arranged in the packing roll (6) in the width direction of the dielectric belt (5) and having a larger magnetic force than the floating magnet (3). A repulsive magnetic field is formed between the opposing magnetic pole (7a) provided opposite to the opposing magnetic pole (3a) of the levitation magnet (3) and the opposing magnetic pole (3a). The magnet (3) levitates due to magnetic repulsion.

In the electrostatic recording device used in this example, the developer used for development can be either a two-component developer or a two-component developer, but especially for a two-component developer, magnetic Since powdered toner is used, when the toner remains and is conveyed by the dielectric belt and passes near the recording needle electrode, the magnetic force of the back magnet (7) etc. prevents the toner from staying near this area.
It is necessary to adjust the magnetic force of the back magnet (7), the conveying force of the dielectric belt (5), etc.

Therefore, when the gap maintaining method in an electrostatic recording device according to the present invention is used, a repulsive magnetic field is created between the opposing magnetic pole (7a) of the back magnet (7) and the opposing magnetic pole (8a) of the floating magnet (3). A dielectric belt (
5) The floating position of the head part (2) floating upward is accurately and easily adjusted by the fine adjustment screw (101) of the holding adjustment member (4), and as a result, the floating position of the recording needle electrode (1) is adjusted easily. The gap (DJ) between the tip discharge part (1a) and the dielectric belt (5) is adjusted and maintained with high precision.

Further, according to the gap maintaining method in the above embodiment, a constant gap fD is maintained between the recording needle electrode (1+ (!: W electric belt (5) in a non-contact state).
Moreover, since no unevenness is formed on the dielectric belt (5) and the head portion (2) facing it, the tip discharge portion (1a) of the dielectric belt (5) and the recording needle electrode (1)
) is effectively prevented from adhering to the toner.
Abrasion of the dielectric belt (5) is prevented, and reliability is improved over a long period of time.

〔Effect of the invention〕

As described above, when the gap maintaining method in the electrostatic recording device of the present invention is used, the back magnet and the floating magnet, which are provided so that the polarities of the opposing magnetic poles match each other, form a repulsive magnetic field, and the floating magnet The head section with the magnet attached is magnetically levitated, and is held and adjusted in a fixed position by the holding adjustment means to ensure the necessary gap, so that the recording needle electrode and the dielectric are always kept in a non-contact state. This effectively prevents the dielectric from wearing out and the residual toner adhering to the dielectric from adhering to the discharging portion at the tip of the recording needle electrode, thereby improving reliability.

Further, according to the gap holding method according to the present invention, the gap can be adjusted accurately and easily by the holding adjustment means, so that the effect is remarkable.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an electrostatic recording device to which the gap maintaining method of the present invention is applied, FIG. 2 is a schematic cross-sectional view showing main parts of the electrostatic recording device of FIG. 1, and FIG. 2 is a sectional view taken along the line A-A in FIG. 2, and FIGS. 4(a) and 4(b) are explanatory diagrams illustrating a conventional gap maintaining method. (Explanation of symbols) (1)...Recording needle electrode (2)...
・Head part (3)...Floating magnet (4)
...Holding adjustment member (3a) ... Opposing magnetic pole (5) ... Dielectric belt (7) ...
... Rear magnet (7a) ... Opposing magnetic pole (8) ... Insertion hole (10) ...
...Fine adjustment screw (D) ...Gap

Claims (1)

[Claims] In an electrostatic recording device that obtains a recorded image by forming an electrostatic image on a dielectric material according to an image signal using a recording needle electrode, etc., a floating magnet is attached to the head section to which the recorder electrode is attached, and this head section is A regulating means is displaceably attached to the holding adjustment means provided near the dielectric, and a regulating means is attached to the dielectric on the opposite side of the holding adjustment means for regulating the dielectric at a fixed position, and the regulating means A back magnet is provided in the vicinity of the opposite magnetic pole of the levitation magnet, and the same pole side faces the levitation magnet, and the head section is levitated above the dielectric material so that the tip discharge part of the recorder electrode and the dielectric material are connected to each other. A method for maintaining a gap in an electrostatic recording device, characterized by adjusting and maintaining a constant gap.