JPS6058875A - Image recorder - Google Patents

Abstract

PURPOSE:To provide a magnetic toner chain irrespectively of the rotation of a magnet roll for feeding a magnetic toner, by providing two different gaps for limiting the thickness of the magnetic toner applied and a permanent magnet for magnetizing a recording electrode. CONSTITUTION:The recording electrode 11 is magnetized by the permanent magnet 13, the magnetic toner 14 is accumulated at a doctor gap 17, and the toner chain 20 is provided at the tip of the electrode 11. A recording voltage is impressed between the electrodes 11, 12 by a recording-controlling circuit 21, thereby producing a toner image on a recording medium 22. The toner 14 thus consumed is re-supplied by the magnetic force of the electrode 11 to provide a new toner chain 20, and picture elements are successively recorded asynchronously with the rotation of the magnet roll 18.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an image recording device using magnetic toner.

Conventional Structures and Problems In recent years, with the development of recording technology, various methods have been proposed for simple recording on plain paper. Image recording apparatuses using electrophotographic technology, which is currently the most common method, have complicated processes and are extremely difficult to miniaturize. Recently, a method has been proposed in which a powder toner is used to directly form a toner image on a recording medium without forming an electrostatic latent image.

A conventional image recording apparatus will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a conventional image recording apparatus. Reference numeral 1 denotes a recording electrode, which is provided on the sleeve θ. A magnet roll 6 is provided inscribed in the sleeve 6, and as the magnet roll 6 rotates in the direction shown by arrow A in FIG. The recording electrode 1 is conveyed upward in the direction of arrow B and reaches the recording electrode 1 . Further, when the magnetic pole of the magnet roll 6 comes behind the recording electrode 1 made of a magnetic material, the recording electrode 1 is magnetized, and a toner chain 9 of the magnetic toner 3 is attached to the tip of the recording electrode 1.
form. When the tip of this toner chain 9 reaches the recording medium 7 and a voltage is applied between the recording electrode 1 and the back electrode 2 by the recording control circuit 8, a magnetic toner image is formed on the recording medium T. This toner image is directly transferred to the recording medium γ.
When the toner chain 9 at the tip of the recording electrode 1 forms a pixel on the recording medium 7, the magnetic toner 3 is consumed and the toner is transferred to another recording medium and then fixed to obtain an image. The chain becomes shorter. However, when the next magnetic pole of the magnet roll 60 reaches the back surface of the recording electrode 1, new magnetic toner 3 is supplied, and a new toner chain 9 is formed to a predetermined length. In this way, the next pixel can be recorded. An image is formed by repeating this operation.

However, according to the conventional image recording apparatus, as shown in FIG. is no longer formed. Therefore, the timing of printing must be synchronized with the rotation of the magnet roll 5, and the recording voltage must be applied at the moment the magnetic pole of the magnet roll 6 reaches the back surface of the recording electrode 1. This causes a problem in that the recording frequency is limited by the rotational frequency of the magnet roll 5.

This problem can be solved by increasing the number of poles of the magnet roll 6 in order to improve the recording frequency (il).However, in that case, the magnetic poles become closer together, resulting in A new problem arises in that not only the number of magnetic lines of force leaking to the outside decreases, and the toner transport ability is reduced, but also the length of the toner chain 9 at the tip of the recording electrode 1 becomes short, making it impossible to obtain a good image.

Purpose of the Invention The present invention solves the above conventional problems.The toner chain at the tip of the recording electrode is formed independently of the magnetic force of the magnet roll, and the recording frequency is limited to the number of rotations of the magnet roll. The purpose is to provide an image recording device that does not

Structure of the Invention The present invention includes two doctor gaps with different gaps that regulate the amount of magnetic toner conveyed on the sleeve by the magnetic force of a magnet roll, and a permanent magnet that is located near the recording electrode and magnetizes the recording electrode. The image recording device must be placed close to the recording electrode.

The above purpose is achieved by forming a toner chain at the tip of the recording electrode, which is magnetized by a permanent magnet, and uses the magnetic force of the recording electrode, which is magnetized by a permanent magnet, to control the toner by a second doctor gear knob installed nearby. be.

DESCRIPTION OF EMBODIMENTS FIG. 3 is a schematic diagram of an image recording apparatus according to an embodiment of the present invention.

In FIG. 3, 11 is a recording electrode, and sleeve 19
A magnetic roll 18 is provided inscribed in the sleeve 19, and when it rotates in the direction shown by arrow A in FIG. 3, the magnetic toner 14 in the toner box 16 is Arrow B in figure 3
The recording electrode 11 and the sleeve 19 form a doctor gap 17. Further, the recording electrode 11 is magnetized by a permanent magnet 13, and when a pool of magnetic toner 14 occurs in the doctor gap 17, a toner chain 20 is formed at the tip of the recording electrode 11. The tip of this toner chain 20 is in contact with the recording medium 22, and when a recording voltage is applied between the recording electrode 11 and the back electrode 12 by the recording control circuit 21, the recording medium 22
A toner image is formed on 2.

The magnetic toner 14 consumed by forming the toner image is transferred to the recording electrode 1 which is turned into an at by a permanent magnet 13.
1 and forms a new toner chain 20. Therefore, pixels can be recorded continuously without synchronizing with the rotation of the magnet roll 18.

Here, the relationship between the doctor gap 16 and the second gap 17 will be explained with reference to FIG.

The doctor gear knob 16 formed by the sleeve 19 and the toner box 16 collects toner by rotating the magnet roll 18.
The amount of magnetic toner 14 transported from the box 16 to the recording electrode 11 is regulated.

Therefore, if the doctor gear knob 16 is large, the amount of magnetic toner 14 that is transported increases. On the other hand, if the size t2 of the second gear nog 17 is larger than the size tl of the doctor gap 16, the magnetic toner 14 will be transferred to the tip of the recording electrode 11. Move smoothly without hesitation. However, if tl>121, the second gap 17
Since the amount of magnetic toner 14 conveyed through the second gear nog 170λ is smaller than the amount of magnetic toner 14 conveyed through the doctor gap 16, the recording electrode 1
A reservoir of magnetic toner 14 is formed at the tip of the toner 1 . The amount of this accumulation can be made constant by selecting appropriate values for the sizes 11 and 12 of the doctor gear knob 16 and the second gap 17. Therefore, a stable toner chain 20 is always formed.

Effects of the Invention The image recording apparatus of the present invention has two different gaps that limit the adhesion thickness of the magnetic toner and a permanent magnet that magnetizes the recording electrode, thereby creating a pool of magnetic toner near the tip of the recording electrode. , it is possible to always form a toner chain of magnetic toner regardless of the rotation of the magnet roll that conveys the magnetic toner. Therefore, the recording frequency can be determined without being limited by the number of rotations of the magnet roll and the number of poles of the magnet roll, and high-speed recording becomes possible, which has great practical effects.

[Brief explanation of drawings]

1 and 2 are configuration diagrams of a conventional image recording device, and FIG. 3 is a configuration diagram of an image recording device according to an embodiment of the present invention.
FIG. 4 is a configuration diagram of the main parts. 11... Recording electrode, 12... Back electrode, 1
3... Permanent magnet, 14...- Magnetic toner, 1
6... Toner box, 16... Doctor gap, 17... Second gap, 18...
...magnetic roll, 19...slj
-F. Figure 1, Figure 2, Figure 3, Figure 8

Claims (1)

[Scope of Claims] 1. A plurality of recording electrodes made of a magnetic material, means for magnetizing the recording electrodes, a magnet roll provided with a sleeve, and regulating the adhesion thickness of magnetic toner adhering to the sleeve of the magnet roll. multiple toner regulation means;
A back electrode provided opposite to the plurality of recording electrodes, a recording medium provided in contact with the back electrode between the recording electrode and the back electrode, and a recording signal selectively transmitted between the back electrode and the recording electrode. An image recording apparatus comprising: means for applying voltage; and means for fixing a toner image formed on the recording medium. 2. The first toner regulating means. two second regulating means are provided, and the gap between the first regulating means is replaced by the second regulating means;
The image recording apparatus according to claim 1, wherein the gap is larger than the gap of the regulating means.