JPS6123165A - Image recording device - Google Patents

Abstract

PURPOSE:To remove accumulated toner and to form a stable image for a long period by providing a means which moves a magnetic wire for toner removal not only in the width direction of a recording medium, but also at right angles to the direction in the front of a magnet. CONSTITUTION:When the center of a pulley is at the lowermost position H, the wire 12 is at positions 12a and 12b, but as the center of the pulley rotates in a direction K, the position of the wire moves in a direction F'; when the center of the pulley reaches the uppermost position J from the position H after a half turn, the wire 12 is at positions 12c and 12d. When the pulley further rotates in the direction K, the wire 12 moves in a direction F to the positions 12a and 12b. At this time, a pulley opposite the pulley 15 cross the magnet 8 moves similarly. Thus, the center position of the pulley rotates in the direction K and then the wire 12 reciprocates between the positions 12a and 12c, and 12b and 12d in areas above and below a recording electrode 7 nearby the front surface of the magnet 8 to remove uniformly toner on the surface of the magnet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an image recording device, and particularly to an image recording device that directly attaches a component conductive magnetic developer (hereinafter abbreviated as toner) to a recording medium in response to an image electrical signal. The present invention relates to an image recording device that records images.

[Background of the invention]

Conventionally, this type of device is described in detail in U.S. Pat. A very general outline of this conventional device will be explained with reference to FIG.

In Fig. 2, reference numeral 1 denotes a recording medium, which consists of an aluminum cylinder 1a and an insulating layer 1b treated with anodized aluminum. Available for use. 2 is a hot cup containing conductive magnetic toner T, and inside is a toner application roller 4 made of a non-magnetic conductive material and made of a hollow cylinder.
There is a magnet 3 arranged inside it. 7 is a recording electrode, which is usually made of magnetic material 5 such as iron, malloy, etc.
2. A large number of thin wires such as kerosene are arranged in parallel in the axial direction facing the recording medium L, or are created by etching technology, etc., and are electrically insulated from each other and fixed with an insulating adhesive (not shown). . Also, the recording electrode 7 is a signal character generator 9
Each is connected independently.

The recording medium 1 moves in the direction of arrow A. Due to the action of the magnet 3, the toner T is attracted and conveyed to the toner application roller 4 rotating in the direction of arrow B, and is transferred to a doctor grade 5
As a result, a uniform layer of toner T is formed on the application roller 4. When this toner T contacts the recording medium 1, it acquires a charge due to the application of a DC voltage from the bias power supply 6 and adheres to the recording medium 1 by electrostatic force.

When the toner on the surface of the recording medium 1 reaches the recording position 10 as the recording medium 1 rotates in the direction of the arrow, the magnetic field generated by the magnet 8 holding the recording electrode 7 at the tip of the recording electrode 7 causes the recording to be performed. Ears of toner T are formed between the medium 1 and the recording electrode 7. The toner on the recording medium 1 loses most of its charge before reaching the recording position 10, and the remaining charge also escapes through the ears of the toner, so the toner loses most of its adhesion at the recording position. When a recording signal corresponding to an image pattern is applied to the recording electrode 7 from the character generator 9, the toner T formed between the recording electrode 7 and the recording medium 1 is transmitted through the ears of the toner T, sandwiching the insulating layer 1b, and forming the conductive layer 1a. Charges of opposite polarity to the toner T appear. This charge sufficiently describes the toner T
Give enough force to attach it to the 01 body. On the other hand, in the area where the recording voltage is not applied (non-image area), there is no charge injection as described above, so no electric force acts between the recording medium 1 and the toner 1, so the toner in that area is transferred from the magnet 8. It is separated from the recording medium by the emitted magnetic field and accumulated near the magnet 8 along the recording electrode 7.

The position facing the recording electrode (recording position)
A toner image visualized according to the image pattern is generated on the surface of the recording medium 10 that has passed through the toner image.

Although not shown, the toner image visualized on the recording medium 1 is usually transferred to paper by corona discharge or pressure transfer, or fixed as is when electrostatic recording paper or the like is used as the recording medium 1. It's okay.

3A and 3B are enlarged views of the vicinity of the recording position 10 in FIG. 2 for more detailed explanation. FIG. 3A shows a case where a recording signal is applied to the recording electrode, and FIG. 3B shows a case where no recording signal is applied. As shown by the broken line, the magnetic field generated by the magnet 8 passes near the recording electrode 7. Now, when a signal voltage is applied from the character generator 9 between the recording medium 1 and the recording electrode 7 as shown in FIG. 3A, the toner T
is attached to the recording medium 1 against the magnetic field 10 due to the electrostatic force caused by the charge injection. However, as shown in FIG. 3B, when no signal voltage is applied from the character generator 9 to the recording electrode 7, no electrostatic adhesion force is exerted between the recording medium 1 and the toner 1, so that 5 magnets 8 and 9 are emitted. Due to the force of the magnetic field 10, the toner T moves in the direction of arrow C and accumulates near the magnet 8. This toner accumulation occurs on the recording medium 1 during long-term use.
t, which is undesirable as it may stain the recording medium 1 or disturb the recorded image.

As a solution to this problem, the applicant proposed the following (Japanese Patent Application No. 58-104042). FIG. 4 is a detailed explanatory diagram of the proposed means, and FIG. 5 is a front view thereof as seen from the left (however, the recording medium 1 is not shown). As can be seen from these figures, a magnetic wire 12 is stretched near the front surface of the recording electrode 7 and the magnet 8 so as to move along the width direction of the recording medium 1 in the directions of forces E and E'. Other than this, the configuration is the same as in FIG. 2, and the same reference numerals as in FIG. 2 indicate parts with similar configuration functions. 11 is an insulator that fixes the magnet 8 and the recording electrode 7 together. With this configuration, the toner T separated from the recording medium 1 by the action of the magnetic field 100 generated by the magnet 8 as described above is attracted by the wire 12. The toner attracted to the wire 12 is carried by the drive system when the wire moves in the directions of the E and E' forces, and when it comes to a range away from the restraint of the magnetic field 10 emitted from the magnet 8, the toner is removed from the wire 12. Annex 2
It falls in the direction of gravity (direction F in Figure 5).

However, in the above means, the toner collection wire 12 moves in the E, E' force directions, but in the F,
There is no movement in the F' force direction. Most of the toner is accumulated near the recording electrode 7 and removed by the wire 12, but some of the toner is accumulated at the poles by the magnetic field generated by the magnet 8 on the surface of the magnet facing the recording medium.

Although this amount is extremely small, if recording is performed over a long period of time, it will not be removed by the wire 12 and will accumulate as shown in FIG. 6. When the toner accumulates in this way, the accumulated toner comes into contact with the toner applied on the recording medium 1 at the position 13 in FIG. 6, and the amount of toner conveyed to the image recording section 10 decreases, resulting in a decrease in image density. , Moshi, and < cause a problem in which white streaks appear in the image. Further, the problem arises that the accumulated toner comes into contact with the recorded image at position 14 and disturbs the recorded image.

As described above, it has been found that it is difficult to prevent toner accumulation and obtain stable images over a long period of time even with the means proposed above.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of the applicant's proposal and to remove accumulated toner over a long period of time to enable stable image formation in this type of image recording apparatus.

[Summary of the invention]

The present invention is characterized in that means is provided for moving the magnetic wire for toner removal and recovery proposed by the applicant in front of the magnet not only in the width direction of the recording medium but also in the direction perpendicular thereto. .

[Embodiments of the invention]

In the recording device having the configuration shown in FIG. 2, the recording medium 1 is a cylinder made of aluminum with a diameter of 100B as a conductive layer 1a, and an insulating layer 1b formed by alumite processing of 2 μm on the surface of the aluminum cylinder. snake. Toner T can be used as long as it is 1010 Ω-α or less, but in this example, 105 Ω-saw was obtained by externally adding carden to Imagenong/#Udder 355 toner sold by 3M Company. The one adjusted to the following was used.

As the recording electrodes 7, 3360 pure iron thin wires with a diameter of 25μ are arranged in parallel across 210 girths, and these recording electrodes 7
The group was fixed to the magnet 87 with an insulating member 11 using No-Isper (trade name) sold by Cemedine Co., Ltd.
The recording medium 1 and the recording electrode 7 face each other at almost right angles, with a gap of 7
The thickness was maintained at 5±25μ (Figure 7). When the two magnets 8 sandwiching the recording electrode 7 were arranged with the same polarity facing each other, the magnetic flux density at the tip of the recording electrode 7 was adjusted to be approximately 1100 μs.

The recording medium 1 is rotated in the direction of arrow A at a linear speed of 200 sa+/sec, and after the toner T is uniformly deposited on the recording medium 1 by the toner application roller 4, when the recording position 10 is reached, the character generator Approximately 30V according to the image pattern from 9
The second image signal voltage is applied to the recording electrode 7.
Image recording is performed as explained in the figure.

At this time, the unnecessary toner accumulated on the recording electrode 7 and the magnet 8 as described above is removed in this embodiment as follows. That is, as shown in FIG. 1), (b), (,) and FIG. It is stretched in the vicinity and extends endlessly between the driving pulley 15 and the driven pulley (not shown). The main pulley 15 moves the collection wire 12 along the arrows g and g'
Transfer at 500 m/s in the force direction. Center of drive pulley 1
6 is supported so as to rotate on an arc 17 in the direction of the arrow at a rate of 1 revolution per second, and the same is true of the driven pulley. If the center of the pulley is now at the lowest position H in the diagram, the wire 12 is 12a in Figure 7.

12b, but as the center of the pulley rotates in the direction, the position of the wire moves in the F' direction, and when the center of the pulley reaches the highest position J in the figure after half a rotation from position H, The position of wire 12 in Figure 7 is 12
ce 12 d. When the pulley further rotates in the opposite direction, the moving direction of the wire 12 becomes the F direction, and it moves to the position 12m, 12b. At this time 1
A pulley (not shown) located opposite the 7' pulley of No. 5 via the magnet is also moving in a similar manner. By rotating the center position of the pulley in this way, the center position of the pulley can be rotated in the opposite direction.

As shown in (,), the wires 12 are located at positions 12 a r 12 near the front surface of the magnet 8 in the upper and lower regions of the recording electrode 7, respectively.
The toner on the surface of the magnet is removed uniformly by repeating the movement between points c, 12b, and lza. The movement range of the wire 12 in the upper and lower regions of the recording electrode 7 is configured to cover the entire front surface of the magnet 8. Note that 11 is an insulator that fixes the recording electrode 7 and the magnet 8 together. Toner that escapes from the magnetic force on the side of the magnet 8 is transferred to the wire 1.
It falls from 2 and is collected.

With this configuration, even if you record images for a long time,
Toner does not accumulate excessively on the magnet surface, thus preventing the accumulated toner from disturbing the image.

〔Effect of the invention〕

According to the present invention, in this type of image recording device, it is possible to prevent unnecessary "toner" from excessively accumulating in the image forming process on the surface of the magnet for applying a magnetic field to the recording electrode and on the recording electrode, and to form a stable image. becomes possible.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (e) are front views showing various states of the embodiment of the present invention, FIG. 2 is a schematic side view showing a conventional example of an image recording apparatus to which the present invention relates, and FIG. , FIG. 3B is a partially enlarged view showing the operation of the apparatus of FIG. 2, and FIG. 5 is a side view and front view showing the toner removal and collection means according to the applicant's previous proposal, FIG. 6 is a side view showing the undesirable toner accumulation situation that occurs in the proposal, and FIG. 2 is a side view of the illustrated embodiment; FIG. DESCRIPTION OF SYMBOLS 1... Recording medium, 4... Toner application roller, 6... DC power supply, 7... Recording electrode, 8
...Magnet, 9...Image signal generation source, 12
...Magnetic wire, 15...Boo IJ-516...
・Pulley center axis, 17... Center axis movement locus. Figure 1<a) (b) , γ? Figure 2 Figure 5 Figure 6 ta.

Claims (1)

[Claims] A moving recording medium, a recording electrode group arranged close to and opposite to the recording medium in the width direction, a signal source that applies a recording signal voltage to the recording electrode group according to an image pattern, and conductive magnetic toner applied to the recording medium. and a magnet extending in the width direction along the recording electrode group to generate a magnetic field between the recording electrode group and the recording medium, in which a space between the magnet and the recording medium is provided with a magnet. An image recording apparatus comprising: a magnetic body extending in the width direction; and means for moving the magnetic body in the width direction and in a direction perpendicular to the width direction.