JPS5844458A - Image recording device - Google Patents

Abstract

PURPOSE:To weaken the sticking strength of toner to the surface of a toner conveying member, by applying an AC electric field to toner at the toner carrier part of the opposed part of a multistylus electrode. CONSTITUTION:A drumlike toner conveying member 6 is provided with a rotary magnet 7 internally to carry one-component magnetic toner 5 in a layer in the opposite direction to the turning direction of the magnet 5. Electrodes 11 and 12 are provided at a small interval where a recording electrode 9 is opposed, and those electrodes are applied with an AC voltage from a power source 13. Therefore, the toner has a force of reciprocating motion between those electrodes 11 and 12, so the sticking strength to the surface of the conveying member 6 is weakened to facilitate the sticking of the toner to recording paper 1 through the recording electrode 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image recording apparatus, particularly an image recording apparatus in which a voltage is applied image-wise to the wLj group and an as' agent is moved to a recording member placed on this electrode group. be.

Conventionally, WA developer powder (hereinafter referred to as toner) is layered and a voltage is applied to a bottle electrode, etc. to partially transfer the toner onto a recording member placed on this electrode, etc. A method of directly obtaining an ili image on plain paper, which is a recording member, is disclosed in Japanese Patent Publication No. 49-34004 and Japanese Patent Application Laid-Open No.
9-8755'', No. 9-8755, etc.).

This type of conventional recording method has the advantage that an image can be directly obtained on plain paper through a simple process. However, the toner adheres to the toner transport medium, and its adhesion force #i varies depending on the individual toner particles. For this reason, a large voltage, such as a voltage applied to the electrodes, is required for recording, and furthermore, there are disadvantages in that the placement is pale and the microscopic image is prone to fogging.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional example, and to reduce the adhesion force of toner to the toner transport medium at the recording position, reduce the applied voltage required for recording, and furthermore provide clear and fog-free images. It makes it possible to obtain images.

The instantaneous image recording device of the present invention, which achieves the above object, has at least one pair of electrodes disposed at a minute interval on a toner conveying member, and while applying electric fields periodically in different directions between the electrodes, the toner is One-component toner is conveyed by passing it over the electrodes of the conveying member, and a recording member is disposed in close proximity between the electrodes, and this recording member is placed on the side opposite to the side facing the toner conveying member. A third electrode is provided in close contact with the recording member, and a signal voltage is applied to the third electrode.

In the above configuration, when the toner conveying member has a fixed cylindrical shape, a magnetized rotating magnet is disposed inside to convey the toner, and when the toner conveying member has a rotating cylindrical shape, the above-mentioned minute A fixed magnet means is disposed inside the spaced member to transport the toner.

When the toner reaches the recording position on the toner conveying member through the above-mentioned formation, the plurality of toners provided on the conveying member separate from the conveying member, so the adhesion force between the conveying member and the toner weakens, and the toner is recorded on the one recording medium side. Even if the voltage applied to the electrodes is low, toner can be transferred to the recording medium 111 favorably.

Furthermore, when the toner is reciprocated at the developing position of the conveyance member, any agglomeration of the toner is dispersed, making it possible to form stable images over a long period of time using the same toner.

FIG. 1 shows an embodiment of the present invention, in which 1 is a web-like recording medium, 2 is an electrode member for applying an image-like signal voltage, and 3 is a means for transporting toner to a recording position. The toner 5 in the toner container 4 is a -component magnetic toner, and is caused by the action of a magnet 7 in which magnetic poles of different polarity are alternately magnetized, rotating inside a toner conveying member 6 made of a non-magnetic cylinder. The toner is conveyed on the toner conveying member 6 in a direction opposite to the rotation of the magnet 7.

When the toner on the toner conveying member 6 passes through the doctor blade 8, the toner adheres to the recording medium 1 in correspondence with the voltage-applied electrodes of the electrodes 9, which are smoothed by the action of the doctor blade 8, thereby forming an image. The toner @#i on the recording medium 1 is then fixed by heating, pressure, or the like.

FIG. 2 shows an enlarged cross-sectional view of the vicinity of the recording position 10.

As shown in the figure, a pair of electrodes 11 and 12 are arranged near the recording section 1110 of the toner conveying member 6 at a minute interval, and an alternating voltage, for example, whose direction changes periodically is applied to these electrodes. be done. The electrodes 11 and 12 are provided via an insulating layer when the toner transport member 6 is made of a conductive material. Here, the toner that has been moved onto the electrodes 11.12 by the toner transport member 6 receives a force that causes it to reciprocate between the two electrodes 11.12 due to the action of this alternating current electric field. If the toner is insulating and contains or has been mixed with a charge control agent, it will not adhere to the toner conveying member 6 due to its special polarity, or the adhesion force will be weakened by the reciprocating movement. When a voltage is applied to the electrode 9 in this state, the toner easily moves and adheres to the recording medium 1.

Therefore, a high voltage is not required to be applied to one electrode, and stable recording is possible with a low applied voltage. 9 Electrodes For high-speed recording, a large number of electrodes are lined up as is well known.
For example, it is preferable to arrange the electrodes at a ratio of 4 to 20 per 11, and individually for each electrode. When the bias effect is used, good results have been obtained, and in particular, toner stirring and movement effects are generated even at a voltage of 50 to 300 at a low voltage.

The method of applying AC voltage is to apply voltages of opposite polarity to one electrode and both electrodes, so that the number of shadows does not appear as "unevenness" in the image. It is desirable that an alternating current voltage of one cycle or more be applied within the recording time of one row of electrodes. When voltages with different traveling properties are applied to the plurality of electrodes of the present invention, the adhesion force of the toner to the toner conveying member becomes weaker than K, making it possible to record with a low applied voltage, and furthermore, the toner is sufficiently agitated at the recording position. As a result, variations in toner adhesion due to environmental changes are less likely to affect recording characteristics.
This also enables stable recording at all times. Also, if both of the toner particles are fixed and the conveyance member is rotating,
The electrode of the present invention is arranged on the entire circumferential surface of this toner conveying member,
The voltage may be applied only when a plurality of these electrodes are at a predetermined position for recording.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a recording apparatus according to the present invention, and FIG. 2 is a partially enlarged sectional view of a recording position. In the figure, 1#i recording medium, 2 recording 11L pole group, 6
indicates a toner transport member and an AC voltage application electrode manufactured by 11th and 12th companies.

Claims (2)

[Claims] (1) At least one pair of electrodes are arranged on the toner conveying member with a certain distance between them, and while applying an electric field with periodically different directions between the electrodes, the toner of the toner conveying member is transferred to the top of the 'dL. The monocomponent toner is conveyed through the electrode, and a recording member is disposed in close proximity to the gap between the electrodes, and the recording member is in close proximity to or in contact with the recording member on the side opposite to the side facing the toner conveying member. An image recording apparatus that includes a recording electrode to which a signal is applied, and applies a signal voltage to the recording electrode. (2) The above-mentioned toner conveying member is a fixed cylindrical member within 1 (3
) The toner transporting member has a rotating cylindrical shape, and an electrode having a minute gap therebetween is provided along the circumferential surface of the cylinder.