JPH0358059A - image forming device - Google Patents

Abstract

PURPOSE:To permit the rear surface of a medium to be grounded and to increase an image display area by forming the rear surface of the recording medium and part of a medium carrying means from a conductive material. CONSTITUTION:The recording sheet 5 is made by laminating a transparent surface layer 5a, a colored layer 5b, and a conductive layer 5c composed of conductive plastic, and the side of the layer 5c is grounded; a roller 6 for driving the sheet 5 is made of a conductive material such as Al. A voltage which meets image information is applied to a recording electrode l; an image is formed by attaching toner 2 on the electrode 1 onto the layer 5a by means of electrostatic force; the image is displayed on the outside, when the sheet passes through an image display part 12 after it is carried in a direction shown by an arrow by means of the rotation of the roller 6. The following recording is carried out after toner 2 attached to the sheet 5 is scraped by a cleaning member 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image forming apparatus that forms an image by electrostatically depositing a developer onto a recording medium.

<Prior Art> Today, various types of image forming devices have been developed depending on image information. Among them, conductive magnetic toner, which is a fine powder developer, is used to electrostatically transfer the toner to a recording medium. There is an image forming apparatus that forms an image by attaching it to a surface.

For example, the method shown in Japanese Patent Publication No. 51-46707 has been proposed. That is, in FIG. 7, the non-magnetic cylinder 5
The conductive magnetic toner 5l is conveyed along the outer circumference of the cylinder 0 by the magnetic field of a rotating magnet 52 provided coaxially with the non-magnetic cylinder 50. At this time, a voltage according to image information is applied by the recording control section to the recording electrodes 53 that are densely arranged along the axial direction on the outer peripheral surface of the non-magnetic cylinder 50. At this time, the voltage is applied between the conductive layer 54b of the recording medium 54 formed by laminating the conductive layer 54b and the insulating layer 54a from the back side provided close to the non-magnetic cylinder 50, thereby insulating the cylinder. An image is formed by adhering the toner 51 to the layer 54a.

In addition, as an apparatus to which the above image forming method is applied, as shown in FIG. The toner 57 is attached or not attached to the recording medium 54 depending on the signal from the recording electrode 56, thereby forming an image.

For example, when a signal voltage of +40 V is applied from the recording control section 58, the toner 57 adheres to the recording medium 54, and when the signal voltage is 0, it does not adhere, and this operation is repeated to form an image.

The toner 57 attached to the recording medium 54 is removed from the image display section 5.
After the image is displayed in step 9, the cleaning member 60
The paper is stripped off by the magnet roller 55, and is conveyed again in preparation for the next recording.

Further, a bias voltage having a polarity opposite to that of the charge on the recording medium 54 is applied to the cleaning member 60 from the static eliminator im6t, and is applied horizontally so as to erase the charging history of the recording medium 54.

Furthermore, the conductive layer 54b laminated below the insulating layer 54a of the recording medium 54 is exposed at the end of the insulating layer 54a of the recording medium 54, as shown in FIG.
A grounded exclusive member 62 is connected to.

In addition, in FIG. 9, 64 is an image type control area, 65 is a drive motor,
66 is a drive roller, and 67 is an electrical equipment section.

Problems to be Solved by the Invention In the above-mentioned conventional technology, however, since the conductive layer 54b is exposed and electrically grounded at the end of the insulating N54a of the recording medium 54, the width of the image display section 59 is However, in many cases, the width of the device becomes large.

In addition, when one image is displayed by dividing the image display unit 59 using a plurality of image formats or devices 63, large gaps are created between the images. There were cases where pictures and text were grouped together and became difficult to see.

Furthermore, the drive motor 65 and the electrical equipment section 67 attached to the lower part of the image display section 59 for conveying the recording medium 54 are often not suitable for split display.

The present invention solves the above-mentioned problems of the prior art and provides an image-forming device that can secure a sufficient image display area by grounding the recording medium from the back surface to establish continuity.

<Means for Solving the Problems> Means applied to the embodiments described below, which solve the problems of the above-mentioned prior art, include a recording electrode for applying a voltage to the developer according to image information, A developer supply means for supplying a developer between a recording electrode and a recording medium, a recording medium to which the developer is attached to form an image, and the recording medium is spanned and fed in a leaping motion. and a conveying means for conveying the recording medium, and a back side of the recording medium and a part of the conveying means for conveying the recording medium are made of a conductive material.

According to the above means, since the back side of the recording medium and a part of the general feeding means for conveying the recording medium are made of a conductive material, by grounding the conveying means, the recording electrode can be connected to Electrical continuity can be established between the recording medium and the recording medium.

Therefore, since conduction is established from the back side of the recording medium, is it necessary to make the entire width of the recording medium the image display area? I can do it.

Embodiment> Hereinafter, an embodiment of an image forming apparatus to which the present invention is applied will be described with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view showing the general structure of an image forming apparatus, FIG. 2 is an enlarged cross-sectional view of a recording medium applied to the above apparatus, and FIG. 3 is a plan view of the recording medium on which an image is formed. .

In FIG. 1, reference numeral 1 denotes a recording electrode for applying a voltage to a developer according to image information, and the recording electrode 1 supplies a conductive magnetic developer (hereinafter referred to as r-toner J) 2. It is closely attached along the axial direction to the outer circumferential surface of a non-magnetic cylinder 3, which is a developer supply means for this purpose.

A rotating magnet 4 is coaxially attached to the non-magnetic cylinder 3, and the magnetic field of the rotating magnet 4 causes the jl1iiJl■ner 2
is conveyed along the outer peripheral surface of the non-magnetic cylinder 3.

An endless belt-shaped recording sheet 5, which is a recording medium for forming an image by adhering the toner 2 to the recording electrode 1, is attached to the recording electrode 1.
are arranged so that some of them are close to each other. The recording sheet 5 is stretched between a drive roller 6 and a tension roller 7, which are a pair of upper and lower rollers and which are separated from each other and serve as conveyance means. The drive roller 6 is made of a conductive material such as aluminum, and a portion thereof is electrically grounded.

On the back side of the recording sheet 5 are a drive motor 8 for driving and rotating the drive roller 6, and a recording control section 9 for applying a voltage to the recording electrode 1 according to image information. Further, an electrical equipment section 11 having a built-in charge eliminating power source 10 for removing charges generated on the recording sheet 5 is provided. The recording control unit 9 applies a voltage corresponding to image information to the recording electrode 1, and charges having the opposite polarity to the charges injected into the toner 2 on the electrode 1 are induced in the conductive layer via the insulating layer. This electrostatic force causes the toner 2 to adhere to the insulating layer to form an image.

The image formed on the recording sheet 5 is displayed externally when the recording sheet 5 is fed in the direction of arrow A by the rotation of the drive roller 5 and passes through the image display section 12. Then, the recording sheet 5 that has passed through the image display section 12 is stripped of the adhered toner 2 by a cleaning member 15 that is fixedly installed via a mounting member 14 that is attached to the back plate 13 of the main body of the apparatus. 2 falls onto the non-magnetic cylinder 3 and is conveyed again in preparation for the next recording.

The cleaning member 15 is a cleaning member main body 15
a and a soft, conductive brush 15b, and the brush 15b rubs the recording sheet 5 at an appropriate angle and distance. The cleaning member wooden body 15a is connected to the static eliminating power source 10, and the charging history of the recording sheet 5 is erased by applying a bias voltage having a polarity opposite to the electric charge on the recording sheet 5 from the static eliminating power source 10. It is something.

The cleaning member 15 may be a soft plastic (polyethylene, polypropylene) having conductivity due to carbon fiber composite, or urethane rubber. Materials such as silicon are used.

Further, a non-magnetic member 16 and a magnet 17 for supporting the recording sheet 5 are disposed at a position facing the cleaning member 15 which faces the recording sheet 5 therebetween.

Next, the structure of the recording sheet 5 applied to the above-mentioned image forming apparatus will be explained with reference to FIG.

The recording sheet 5 consists of a surface layer 5a made of a transparent material mainly composed of butyral resin, phenol resin, or urethane resin, a colored Ia-free substance, and an adhesive (acrylic resin, plastic resin). It is formed by polymerizing a colored layer 5b and a conductive N5c made of a conductive material (powdered carbon or conductive plastic in which powdered metal particles are dispersed) having a volume resistance of 102ΩCl1 or less.

The surface layer 5a and the colored layer 5b are electrically insulated, and the colored layer 5b is made of titanium oxide (T iOz ) to produce white as the base color of the screen. An inorganic material such as aluminum oxide (Aj!zOi) was used.

According to the above structure, the back side of the recording sheet 5 is covered with the conductive layer 5c.
By making the drive roller 6 that conveys the recording sheet 5 from a conductive material, it is possible to ground the recording sheet 5 from the back side, and display an image on the entire surface of the recording sheet 5. Therefore, the width of the entire device can be reduced to the image display area l2.
It is possible to get very close to the width of .

Therefore, as shown in FIG.
The distance between them can be narrowed, and adjacent images can be displayed in a substantially connected state.

Furthermore, by arranging the electrical component 11 on the back side of the recording sheet 5 that is stretched over the pair of rollers 6 and 7, the overall size of the device can be brought closer to the image display portion 12, making the device more compact. You can.

The conductive layer 5c of the recording sheet 5 can also be made of a composite material of conductive plastic and mesh-like carbon fibers or metal fibers.

According to the JR precepts mentioned above, the strength of the recording sheet 5 can be increased and its durability can be improved.

Further, as shown in FIG. 4, a non-magnetic cylinder 3 and a recording sheet 5 are
The image display section 12 can be further expanded by installing a driving roller 6 at the bottom of the device.
A more natural split display becomes possible.

Other Embodiments Next, other embodiments of the recording sheet 5 applied to the above embodiment will be described with reference to FIGS. 5 and 6.

In FIG. 5, like the recording sheet 5, the recording sheet 18 includes, from the front side, butyral resin 5, phenol resin,
Alternatively, the surface layer 18a is made of a transparent material whose main component is urethane citrus, etc., and the colored layer isb is made of a colored inorganic substance and an adhesive (ac-1-nor resin, plastic resin).
, and aluminum or IT for conductivity.
Conductive layer 18 deposited with ○ (indium and tin oxide)
c, and a base material 18d made of a plastic resin such as ethylene terephthalate, polyethylene, polypropylene, etc. is polymerized. A cutout is provided in a part of the surface layer 18a and the colored layer 18b to expose the conductive layer 18c, and a conductive resin or a conductive material is formed to establish electrical continuity from the front side of the conductive layer 18c to the back side of the base material 18d. A conductive portion 18e made of adhesive tape or the like is provided by overlapping.

According to the above structure, it is possible to ground the recording sheet 18 from the back side, and the apparatus can be simplified as in the previous embodiment.

Further, in the recording sheet 18 in the above embodiment, as shown in FIG. 6, the conductive portion 18e is omitted and the conductive Jil 8c and base material 18d, which are partially exposed to the outside, are folded back and used. It is also possible.

In this case, since the folded conductive layer 18c is on the back side, it is possible to ground the recording sheet 18 from the back side with a simpler arrangement.

Effects of the Invention> As described above, in the present invention, since the back side of the recording medium and a part of the conveying means for conveying the recording medium are made of conductive material, recording can be performed by grounding the conveying means. Electrical continuity can be established between the electrode and the recording medium.

Therefore, since conduction is established from the back side of the recording medium, the entire width of the recording medium can be used as an image display area.

Further, even when images are displayed in a divided manner using a plurality of image forming apparatuses, the distance between the image display units can be narrowed, and adjacent images can be displayed in a substantially connected state.

Further, by arranging the driving means for driving the conveyance means on the back side of the recording medium, the apparatus can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram showing a schematic configuration of an image forming apparatus, FIG. 2 is an enlarged cross-sectional view of a recording medium applied to the above apparatus, FIG. 3 is a plan view of the recording medium on which an image has been formed, and FIG. 6 to 6 are explanatory diagrams of other examples, and FIGS. 7 to 11 are explanatory diagrams of conventional examples. 1 is a recording pole, 2 is a toner, 3 is a non-magnetic cylinder, 4 is a rotating magnet, 5 and 18 are recording sheets, 5a. 18a is the surface layer;
5b. 18b is a colored layer, 5c and 18c are conductive layers, 6 is a drive roller, 7 is a tension roller, 8 is a drive motor, 9
1 is a recording control unit, IO is a power supply for static elimination, 11 is an electrical equipment unit, 12
13 is an image display section, 13 is a back cover, 14 is a mounting member, 15 is a cleaning member, 15a is a cleaning member main body, 15
b is a brush, l6 is a non-magnetic member, 17 is a magnet, 18d is a base material, and 18e is a conductive part.

Claims (1)

[Scope of Claims] A recording electrode for applying a voltage to a developer according to image information, a developer supply means for supplying a developer between the recording electrode and a recording medium, and the developer. a recording medium to which an image is formed by adhering to the recording medium; and a conveyance means for conveying the recording medium across the back side of the recording medium and a part of the conveyance means conveying the recording medium. An image forming apparatus characterized in that it is made of a conductive material.