JPH0439659A - Coating device for developer - Google Patents

Abstract

PURPOSE:To prevent the generation of wrinkling at the time of pressure development by applying powder to a part other than a part coated with a recording medium developer with almost the same thickness as the layer thickness of the developer. CONSTITUTION:Developer 26 is selectively applied to a recording medium P by a developer applying unit 20 based upon image information and the part of the recording medium P other than the part coated with the developer 26 is coated with toner 36 by a toner applying unit 30 with almost the same thickness as the layer thickness of the applied developer 26. Consequently, color developing paper with uniform thickness can be produced, and since pressure can be impressed to the paper at the time of pressure development, no wrinkling is generated. Since the toner 36 is inexpensive as compared with the developer 26, the rise of production cost can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developer coating device in an image forming apparatus.

[Prior Art] Conventionally, in a color copying machine that copies a desired image onto developer paper, developer coating has been used to easily create developer paper from plain paper, etc., without using commercially available developer paper. Image forming apparatuses equipped with such devices have been proposed.

This type of color developer application device applied color developer to the entire surface of the recording medium, but when the user wants to form an image on a part of the recording medium, the user applies the color developer to the entire surface of the recording medium. It is economically wasteful to do so. The developer only needs to be applied to the area where the image is to be formed. Therefore, a color developer application device has been proposed that applies a color developer only to necessary portions (that is, portions involved in image formation).

[Problem to be solved by the invention] However, the color developer paper partially coated with a color developer is
There is a difference in thickness between the area where the color developer is applied and the other areas. If there is a difference in thickness, there will be a difference in the pressure applied during pressure development, resulting in wrinkles on the developing paper after pressure development.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a color developer coating device that does not cause wrinkles on color developer paper due to pressure development.

[Means for Solving the Problems] In order to achieve this object, the color developer application device of the present invention includes a color developer application means for selectively applying a color developer to a recording medium based on image information; It consists of a powder coating means for applying powder to a portion of the recording medium other than the portion coated with the color developer to a layer thickness that is approximately the same as the layer thickness of the color developer applied.

[Function] In the developer coating device of the present invention having the above configuration,
The color developer is selectively applied to the recording medium based on the image information by the color developer application means, and the developer coated by the powder application means is applied to the portions of the recording medium other than the portions coated with the color developer. The powder is applied in a layer thickness that is approximately the same as the colorant layer thickness.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 2 is a schematic configuration diagram of an image forming apparatus to which the color developer coating apparatus of the present invention is applied. The image forming device M includes an exposure device 1
, a developer coating device 2 , a pressure developing device 3 , and a heat fixing device 4 . The microcapsule sheet 7, which is photosensitive and pressure-sensitive paper, is configured to be sent out from a paper feed roll 5 and wound up by a winding roll 6. At this time, the microcapsule sheet 7 is exposed by the exposure device 1.

The developer coating device 2 is provided in the center of the casing of the image forming device M, and a recording medium P such as plain paper is placed on the side thereof.
A paper case 16 is provided for storing.

This recording medium P is supplied to the developer coating device 2 through the insertion port 61. A developer is applied onto the recording medium P by the developer coating device 2, and developer paper is manufactured.

A pressure developing device 3 is provided next to the color developer coating device 2. In this pressure developing device 3, the microcapsule sheet 7 and the color developing paper are overlapped. Then, by pressure development, the image on the microcapsule sheet 7 is transferred to color developer paper.

Thereafter, the color developing paper is conveyed to a heat fixing device 4. This thermal fixing device 4 fixes the image on the developer paper.

The exposure device 1 includes a document table 17, a halogen lamp 8, a lens 11, a color separation filter 9, and an exposure section 18. The original 10 placed on the original table 17 is exposed to light by the halogen lamp 8. This reflected light is then focused by the lens 11, further passes through the color separation filter 9, and is projected onto the exposure section 18. This exposure section 1
Guide rollers 12.12 are provided on the left and right sides of 8.

The microcapsule sheet 7 exposed by the exposure device 1 is conveyed to the pressure developing device 3 via guide rollers 12, 12 provided on the downstream side.

The developer paper produced by the developer coating device 2 is superimposed on the microcapsule sheet 7 by a guide 19. In this state, the color developing paper is transferred to the pressure developing device 3.
is sent between pressure rollers 14 and 14. Then, pressure development is performed. The microcapsule sheet 7 that has passed through the pressure developing device 3 is taken up by a take-up roller 6 via a guide roller 13 . On the other hand, the color developing paper that has passed through the pressure developing device 3 passes through the heat fixing device 4 and then goes to the stocker 15.
is discharged.

Next, the developer coating device 2 will be explained in detail using FIG. 1.

An insertion port 61 and an ejection port 62 are provided on the side of the device exterior 63. Further, inside the apparatus, a recording medium conveying belt 52 is stretched by five rotatable counter electrodes and a pair of auxiliary rollers 53. By this recording medium conveyance belt 52, the recording medium P entered from the insertion opening 61 passes through the developer coating area 27 and the toner coating area 37.
It is transported to the take-out port 62. The counter electrode 51 is connected to a negative (=) power source E so that it can attract the positively (+) charged color developer.

A developer coating unit 20 is provided in the developer coating area 27 . The color developer application unit 20 includes an aperture electrode 2
1, a rotatable color developer carrying roller 22, a rotatable supply roller 23, a layer thickness regulating member 24, a case 25, and a color developer 26. Aperture electrode 2
1 is arranged at a constant interval from the counter electrode 51, and furthermore, the color developer carrying roller 2 is placed on both sides of the aperture electrode 21.
2 is placed facing the counter electrode 51. A layer thickness regulating member 2 is provided upstream of the developer carrying roller 22 in the rotational direction.
4 and a supply roller 23 are provided in contact with the developer carrying roller 22, respectively. The supply roller 23 is covered by a case 25, and a color developer 26 is stored inside the case 25.

Further, in the toner application area 37, a toner application unit 3
0 is set. The toner application unit 30 has the same configuration as the developer application unit 20, so a description thereof will be omitted.
A styrene-acrylic transparent toner 36 is stored instead of the color developer 26 in FIG. This toner 36 is a toner used in electrophotography and is much cheaper than the color developer 26.

As shown in FIG. 3, the aperture electrode 21 includes an insulating layer 43,
A large number of apertures 41 are provided in a row on the reference electrode layer 42 , and a control electrode layer 44 is provided around each aperture 41 . Each aperture 4
1 penetrates the aperture electrode 21. The reference electrode layer 42 is also connected to ground, and the control electrode layer 41 is connected to the signal source S1. S
Connected to 2.

Next, the operation of the color developer coating device 2 will be explained.

The recording medium P inserted into the apparatus through the insertion port 61 is attracted to the recording medium conveying belt 52 and transferred to the color developer application area 27.
As described later, a color developer 26 is selectively applied to a portion of the recording medium P by the color developer application unit 20 that is transported to the recording medium P.

Next, the recording medium P is conveyed to the toner application area 37.

Here, the toner application unit 30 applies the toner 36 to the portions of the recording medium P where the color developer 26 is not applied.
Applied selectively.

Here, the functions of the color developer application unit 20 and the toner application unit 30 will be explained.

In the developer coating unit 20 , the developer 26 is supplied to the developer carrying roller 22 by the supply roller 23 .

At this time, the color developer 26 is rubbed while contacting the supply roller 23 and the color developer carrying roller 22. Due to this contact and friction, the color developer 26 is positively charged (+). The charged color developer 26 is carried by the color developer carrying roller 22, and the amount of the color developer 26 is made uniform by the layer thickness regulating member 24. Then, a certain amount of color developer 26 is supplied near the aperture electrode 21 . .

In the aperture electrode 21, a positive (+) potential is applied from the signal source S1 to the control electrode layer 44 at the image forming portion. Then, an electric field is generated inside the aperture 41 that accelerates the positively charged color developer 26 from the reference electrode layer 42 to the control electrode layer 44 . Then, the positively (+) charged color developer 26 passes through the aperture 41.

As described above, the flow of the color developer 26 is modulated by the aperture electrode 21, and the color developer 26 is adsorbed onto the recording medium P.

Similarly, in the toner application unit 30, the toner 36 is modulated by the aperture electrode 21 and adsorbed onto the recording medium P, but the signal source S2 is set so that the toner 36 is adsorbed to a location where the color developer 26 is not applied. A signal is sent from.

As is clear from the detailed description above, in the developer coating device 2 of this embodiment, the developer coating unit 20 selectively applies the developer 2 to the recording medium P based on image information.
The toner coating unit 30 applies toner 3 to a portion of the recording medium P other than the portion coated with the color developer 26 in a layer thickness that is approximately the same as the layer thickness of the color developer 26 coated.
6 is applied, it is possible to produce a color developer paper with a uniform thickness, and since there is no unevenness in the pressure applied to the color developer paper during pressure development, wrinkles do not occur. Furthermore, since the toner 36 is cheaper than the color developer, the cost is reduced.

It should be noted that the present invention is not limited to the embodiments described above, and modifications can be made without departing from the spirit thereof.

[Effects of the Invention] As is clear from the above detailed description, in the developer coating device of the present invention, the developer is selectively applied to the recording medium based on image information by the developer coating means. Since the powder coating means applies the powder to a portion of the recording medium other than the portion coated with the color developer in a layer thickness that is approximately the same as the layer thickness of the coated color developer, a developer having a uniform thickness can be obtained. Colored paper can be produced, and wrinkles do not occur because the pressure applied to the color developing paper during pressure development is not uneven.

[Brief explanation of the drawing]

1 to 3 show embodiments embodying the present invention, FIG. 1 is a block diagram of a developer coating device embodying the present invention, and FIG. FIG. 3 is a schematic configuration diagram of an image forming apparatus to which the colorant coating device is applied, and FIG. 3 is a perspective view of an aperture electrode. In the figure, 2 is a color developer coating device, 3 is a pressure developing device, 7 is a microcapsule sheet, 20 is a color developer coating unit, 2
1 is an aperture electrode, 26 is a color developer, 30 is a toner application unit, 36 is a toner, P is a recording medium, and M is an image forming device.

Claims (1)

[Scope of Claims] 1. A latent image based on image information is formed on a photosensitive recording medium, and the recording medium is integrated with the recording medium coated with a color developer by a color developer coating device and pressure developed. In a color developer application device in an image forming apparatus in which the latent image is developed on the recording medium, the color developer application device selectively applies a color developer to the recording medium based on image information. a developer coating means, and a portion of the recording medium other than the portion coated with the color developer,
A color developer coating device comprising: powder coating means for applying powder to a layer thickness that is approximately the same as the layer thickness of the applied color developer.