JP2620344B2 - Image forming device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly, to a method in which a voltage is applied between a recording electrode composed of many recording elements and a recording medium, and a multicolor The present invention relates to an image forming apparatus such as a display device for attaching image forming particles (toner) to a recording medium.

2. Description of the Related Art Conventionally, as an image forming method of this type, there is a method known in, for example, Japanese Patent Publication No. 46707/1976.
This method includes, as shown in FIG.
The conductive magnetic toner 7 is transported to the outer periphery of the non-magnetic cylinder 6 by the magnetic field of the rotating magnet 8. At this time, the recording control unit controls the image information on the recording electrodes 9 densely arranged in the axial direction on the non-magnetic cylinder 6. To the conductive layer 1b of the recording medium 1.
And an insulating layer of the recording medium 1 corresponding to the recording information.
The image is displayed by attaching the toner 7 to 1a.

Further, a display device utilizing the recording electrode 9 has been devised as the above-mentioned development system.

FIG. 8 is a sectional view of the entire apparatus. That is, the toner 107 is conveyed onto the recording electrode 109 by the rotation of the magnet roller, and the toner 10 is applied to the recording medium 101 at a position facing the recording electrode 109 in accordance with a signal from the recording electrode 109.
7 forms an image with or without adhesion. For example, when the signal voltage from the recording control unit 110 is applied at +40 V, the image is formed from the process in which the toner 107 adheres to the recording medium 101 and does not adhere at 0 V. After the image is formed and displayed in this manner, a cleaning member 113 having a cleaning body 113a and a brush 113b is provided.
As a result, the image is erased.

8, reference numerals 102 and 103 denote rollers, 104 denotes an image forming means, 106 denotes a non-magnetic cylinder, 111 denotes an apparatus main body, 112 denotes a display unit, 114 denotes a mounting member of the cleaning member 113, 11
5 is a non-magnetic metal plate, and 116 is a magnet.

The main part of the above-mentioned cleaning mechanism is as shown in FIG. 9, and the cleaning member 113 is composed of a cleaning body 113a and a brush 113b as a soft and conductive erasing means. 1 and is positioned so as to rub the recording medium 101,
Further, the cleaning member 113 is applied with ground or a voltage of several volts (the cleaning bias 120 in FIG. 8). When the recording medium 101 moves downward from above the cleaning unit, the toner 107 forming an image on the recording medium 101 is rubbed by the brush 113b on the recording medium 101, and at this time, the cleaning member 113 The image forming means is electrically neutralized by the application of the ground or the cleaning bias, and is attracted to the tip of the brush 113b by the magnet 116, and falls by its own weight to be seen in the eighth time. Collected by 104 and used again for image formation.

[Problems to be Solved by the Invention] However, in the prior art described in FIGS. 8 and 9, since the recording medium 101 and the magnet 116 are close to each other, as shown in FIG. When removing the recording medium 101, the toner 107 is attracted to the magnet 116.
Will adhere to the top, and as a result, the toner 107 will fall,
There has been a problem that the inside and the surroundings of the apparatus are soiled.

The present invention seeks to solve the above problems. That is, an object of the present invention is to provide an image forming apparatus in which no toner adheres to a recording medium by a magnet when the recording medium is removed, and the inside and the periphery of the apparatus main body are not stained. It is.

Means for Solving the Problems In order to achieve the above object, the present invention provides a recording electrode composed of a number of recording elements, a unit for supplying a magnetic developer to the recording electrode, and a signal voltage applied to the recording electrode. A recording medium that moves relatively close to the recording electrode, an erasing member provided at a position close to the recording medium for erasing a recorded image, and a driving circuit that faces the erasing member. And a magnet arranged on the back surface of the recording medium to attract the magnetic developer, wherein the magnet arranged on the back surface of the recording medium is close to the recording medium during image recording. And the recording medium is detached from the recording medium when the recording medium is removed.

[Operation] According to the present invention, since the magnet disposed on the back surface of the recording medium is provided so as to be separated from the recording medium, the magnet facing the image erasing member when the recording medium is removed. The recording medium may be removed after separating the recording medium from the recording medium, and by using such a configuration,
The magnet reduces the magnetic restraining force on the magnetic developer attached to the recording medium, and the magnetic developer falls under its own weight, so that the magnetic developer can be returned to the toner collecting section. Therefore, the recording medium can be removed without soiling the inside of the apparatus main body and its surroundings.

[Embodiment] Fig. 1 shows a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a recording medium, which is wrapped around a pair of rollers 2, 3 arranged vertically. At a position facing the roller 3, an image forming means 4 for forming an image on the recording medium 1 is provided.

As the image forming means 4, the one disclosed in JP-B-51-46707 or the like is used, and is as described above. That is, as shown in FIG. 7, a conductive magnetic toner 7 is carried around the non-magnetic cylinder 6 by the magnetic field of the rotating magnet 8. At this time, a voltage corresponding to the image information is applied to the conductive layer 1b of the recording medium 1 by the recording control unit 10 to the recording electrodes 9 densely arranged along the axial direction on the non-magnetic cylinder 6 to perform the recording. According to the information, the toner 7 is attached to the insulating layer 1a of the recording medium 1 for display.

The image displayed on the recording medium 1 is displayed by the display unit 12 formed on the front of the apparatus main body 11. On the back side of the recording medium 1, a cleaning member 13 as an erasing member for erasing an image displayed on the recording medium 1 is fixed to a back plate of the apparatus main body 11 via a mounting member 14. . The cleaning member 13 includes a cleaning body 13a and a brush 13b as a soft and conductive eraser, and the brush 13b is positioned so as to rub the distance medium 1 at an appropriate angle and distance. The cleaning member 13 is made of a material such as carbon fiber, soft plastic (polyethylene, polypropylene), urethane rubber, silicon, or the like, which has conductivity by compounding. A non-magnetic member for supporting the recording medium 1 is provided at a position facing the cleaning member 13 with the recording medium 1 interposed therebetween.
15 and a magnet 16 are provided. The magnet 16 is for preventing the toner 7 from scattering at the time of erasing the image. The magnet 16 collects the toner 7 at the tip of the brush 13b to increase the contact area between the recording medium 1 and the cleaning member 13 and to form the image. It performs a function of efficiently performing collection and reuse for the means 4. The non-magnetic member 15 is supported on a positioning member 17 attached to the back plate by a spring supporting member 18.
Pressed by 19 is arranged.

In this embodiment, in order to completely eliminate charges generated on the recording medium 1, a power supply 20 for removing charges is used, and a voltage having a polarity opposite to that of the charges generated on the recording medium 1 via the cleaning member 13 is applied. It is configured to apply.

FIG. 2 is an enlarged sectional view of the recording medium 1 applied to the first embodiment.

In the figure, 1A is a surface layer, butyral resin,
1B made of a transparent material mainly composed of phenol resin or urethane resin, and provided on the lower surface of the surface layer 1A.
Is a white layer composed of a white inorganic substance such as titanium oxide (TiO ₂ ) and aluminum oxide (Al ₂ O ₃ ) and an adhesive (acrylic resin, plastic resin). 1D located at the lowermost layer of the recording medium 1 is a base material made of a plastic resin such as polyethylene terephthalate, polyethylene, or polypropylene. The upper surface thereof is made of aluminum or ITO (indium and tin) in order to have the same. An oxide) is provided on the conductive layer 1C.

In the above configuration, the toner image is displayed on the display unit 12. In the present invention, when the recording medium 1 is removed, the above-described object is achieved by separating the non-magnetic member 15 from the magnet 16 by the spring 19. it can. That is, during normal image recording, the recording medium 1 is in a state of being close to the magnet 16 as shown in FIG. 3A. However, when the recording medium 1 is removed, as shown in FIG. 3B, the magnet 16 and the recording medium 1 are separated from each other, the magnetic binding force on the toner 7 is weakened, and the toner 7 drops by its own weight. The process returns to the image forming unit 4. Therefore, when the recording medium 1 is removed, the toner 7 does not exist on the recording medium 1, so that the recording medium 1 can be removed without soiling the inside of the apparatus main body and the surroundings with the toner 7.

FIG. 4 shows a second embodiment of the present invention. This fourth
In the figure, a fixed non-magnetic member 21, a magnet supporting member 23 supporting the magnet 16, and the member 23 are pressed. Except for having the spring 22, the apparatus is the same as that of the above-described first embodiment. Hereinafter, the same parts will be described with the same reference numerals.

In the second embodiment, when the recording medium 1 is removed, the magnet 16 is retracted by the spring 22 and separated from the non-magnetic member 21 to achieve the above object. That is, during normal image recording, the recording medium 1 is in a state of being close to the magnet 16 as shown in FIG. 5A. However, when the recording medium 1 is removed, as shown in FIG. 5B, the magnet 16 and the recording medium 1 are separated from each other, so that the toner 7 is applied to the image forming unit 4 as in the first embodiment. Returning again, the toner 7 also disappears on the recording medium 1, so that the inside of the apparatus main body and its surroundings are not stained. In addition, non-magnetic members
Since the magnet 16 is moved backward by fixing the magnet 21, it is possible to remove the toner 7 without applying excessive pressure to the recording medium 1. Therefore, there is no fear that the recording medium 1 is wrinkled or the recording medium 1 is elongated.

FIG. 6 shows a third embodiment of the present invention. In the figure, the apparatus is the same as that of the above-described second embodiment except that it has a cleaning moving member 24. Hereinafter, the same parts will be described with the same reference numerals.

In the third embodiment, when removing the recording medium 1,
While the recording medium 1 is inside the apparatus main body, that is, while the recording medium 1 is at a position where a normal image is displayed, the magnet 22 is retracted by the spring 22 in the same manner as in the second embodiment.
The object can be achieved by causing the cleaning member 13 to retreat by the cleaning moving member 24. In other words, while the recording medium 1 is inside the apparatus main body 11, the magnet 16 and the recording medium 1 are separated from each other, and the cleaning member 13 is also separated from the recording medium 1, so that the toner 7 as the magnetic developer is separated. Magnetic force on the recording medium, and almost all of the toner 7 around the cleaning section on the recording medium, which is mechanically attached, can be dropped. The recording medium 1 can be removed.

[Effects of the Invention] As described above, according to the present invention, the magnet disposed on the back surface of the recording medium is provided so as to be relatively separated from the recording medium when the recording medium is removed. Therefore, when the recording medium is removed, no extra toner is left on the recording medium, so that the recording medium can be attached and detached without contaminating the inside of the apparatus main body and its surroundings with the toner. This has the effect.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing a first embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view of the recording medium of FIG. 1, FIG. 3A is an enlarged sectional view showing a state of the recording medium and the magnet of FIG. 1 at the time of image formation, and FIG. FIG. 4 is a sectional side view showing a second embodiment of the present invention, and FIG. 5A is an enlarged sectional view showing a state of the recording medium and the magnet of FIG. 4 during image formation. FIG. 5B is an enlarged sectional view showing a state in which the recording medium is similarly removed, FIG. 6 is a sectional side view showing a third embodiment of the present invention, and FIG. FIG. 8 is a cross-sectional side view showing another example, FIG. 9 is an enlarged view of the cleaning unit in FIG. 8, and FIG. 10 omits the cleaning member in FIG. It is the enlarged view shown. DESCRIPTION OF SYMBOLS 1 ... Recording medium, 4 ... Image forming means 7 ... Toner, 9 ... Recording electrode 11 ... Device main body, 13 ... Cleaning member 15 ... Sex member, 16 ... Magnet 17 ... Positioning member, 18 … Spring support member 19… Spring, 20… Power supply for static elimination 21… Non-magnetic member, 22… Spring 23… Magnet support member, 24… Cleaning moving member

Claims (1)

(57) [Claims] A recording electrode comprising a plurality of recording elements; means for supplying a magnetic developer to the recording electrode; a driving circuit for applying a signal voltage to the recording electrode; A recording medium that moves to the recording medium, an erasing member provided at a position close to the recording medium for erasing a recorded image, and a magnetic developer that is arranged on the back surface of the recording medium to face the erasing member and attracts the magnetic developer. In an image forming apparatus having a magnet, the magnet arranged on the back surface of the recording medium maintains a position close to the recording medium during image recording, and when removing the recording medium, An image forming apparatus provided so as to be relatively separated from the recording medium.