JPH03211552A - Color developer applying device and image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for applying a particulate color developer to an arbitrary support such as plain paper.

[Prior art] Conventionally, in recent years, as one of the methods of color copying, microcapsule paper has been exposed to light, and a color developer paper that reacts with the microcapsule paper and the microcapsule paper are stacked and pressed together to form a desired color onto the developer. A method for obtaining copies has been put into practical use. However, with the above copying method, it was impossible to copy onto plain paper.

Therefore, since the color developer paper coated with the color developer described above is not versatile and is difficult to obtain, the applicant proposed an apparatus for applying the color developer to a support such as plain paper, and a device for applying the color developer to a support such as plain paper. We have proposed an image forming device using this device. Such an apparatus includes, for example, a carrier carrying a charged particulate color developer in order to apply the color developer to the support;
For example, by arranging the roller to face the support without contacting it,
There is a color developer application device that transfers a color developer to a support using electrostatic force generated by an electric field. In this device, the application portion is formed by a carrier roller made of aluminum, resin, or the like, and a charging roller made of sponge, rubber, or the like and provided close to the carrier roller. These two color developers are
It is frictionally charged by two rollers and applied electrostatically.

[Problem A to be Solved by the Invention] However, in this color developer coating device, t! (
Since the amount of charge of the color developer on the holding roller is small, there is a problem that the coating speed for electrostatically coating the color developer on the support is very slow. Therefore, there is a drawback that the image forming speed of an image forming apparatus using this color developer application device becomes extremely slow.

The present invention has been made in order to solve the above-mentioned problems, and it provides sufficient chargeability to the color developer by 4-1"J, and as a result, supports such as Y9 paper can be coated with a large amount of electricity. It is an object of the present invention to provide a color developer coating device that can stably apply a color developer.Furthermore, another object of the present invention is to provide an image forming device with a high copying speed.

[Means for Solving the Problems] In order to achieve this object, the color developer coating device of the present invention includes a supporting means that supports a particulate color developer and is disposed opposite to a support; A corona charger for charging the particulate color developer is provided near the supporting means, and an electric field is formed between the T-mouth holder and the support to charge the particulate color developer to the support. Apply flying paint.

Further, an image forming apparatus using the color developer coating device of the present invention may be configured such that a support coated with the particulate color developer and a photosensitive pressure sensitive recording medium on which a latent image has been formed by exposure are stacked and pressed together. An image is formed on the support.

Further, the image forming apparatus of the present invention forms an image on the support 1- by applying a particulate color developer to a photosensitive pressure-sensitive medium on which a latent image has been formed by exposure, and then applying pressure over the support. ing.

[Function] 1. The developer coating device of the present invention having the following configuration includes:
The powdered color developer is placed opposite the support.
't L! j means, the particulate color developer is charged by a corona charger in the vicinity of the supporting means, and (1
The particulate color developer is sprayed onto the support by an electric field formed between the carrier and the support.

Further, an image forming apparatus using the developer coating device of the present invention presses the support coated with the particulate developer and the photosensitive pressure sensitive recording medium on which a latent image has been formed by exposure with a small knife. By this, an image is formed on the support.

K. The image forming apparatus of the present invention forms an image on the support by applying particulate color developer to a photosensitive pressure-sensitive medium on which a latent image has been formed by exposure to light, and then pressurizing the medium with a support. are doing.

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

The drawing is a configuration diagram of an image recording apparatus equipped with a developer coating device according to an embodiment of the present invention.

At the top of the image forming apparatus 10, a document table 12 for placing a document, a document 14 placed on the document table, and a document cover 13 are provided. Inside the image forming apparatus, a charging/coating section 20 and an exposure/developing section 40 are provided.

The exposure and development section 40 includes a lens 15 for condensing light from the original 14, a capsule sheet roll 41 wrapped with a capsule sheet 43, and an exposure section 42 on the capsule sheet 43 for forming an image. , an idle roller 47 for driving the capsule sheet 43, and a pair of rollers 48.
．． 48, a fixing unit 50 downstream thereof, and a cutter 51. .

The charging application section 20 includes a toner case 21, in which developer toner 22 is stored.

The color developer toner 22 is made by adding wax, a charge control agent, etc. to a phenol-based or salicylic acid-based color developer and turning it into powder. At the bottom of the toner case 21, there is a carrier roller 30, which is formed of a cylinder made of aluminum or steel and has, for example, knurled grooves on its surface, and a brush portion 23 and a shaft that are installed substantially close to the carrier roller 30. Part 24
A charging roller 25 is provided.

The brush portion 23 is made of a pile of nylon, acrylic, or the like, for example. The carrying roller 30 and the charging roller 25 are grounded. A corona charger 2 is located downstream of the charging roller 25 in the rotational direction at a portion of the carrier roller 30.
8 is provided. The corona charger 28 is composed of a discharge wire 27 made of tungsten or the like and a shield 26 placed around the discharge wire 27.
Connected to a ~5 kilovolt negative power supply. Further, a counter electrode roller 29 is disposed facing the carrier roller 28 with the support body 45 in between and is connected to a positive power source E2 having an applied voltage of about 2 kilovolts.

The support 45 is wound around a support roll 44, and is reversed by the facing electrode roller 29 of the charged coating section 20 located downstream thereof, and then transferred to the pressure developing section 49, the heat fixing section 50, and the cutter 51.
It is then discharged to the outlet 11.

Next, the operation of the present image forming apparatus will be explained.

The support body 45 sent out by the rotation of the support roll 44 reaches the charging application section 20 . The developer toner 22 is applied to the brush portion 2 of the charging roller 25 rotating inside the toner case 21.
Frictionally charged by 3, the average charge amount is -1~
Charge to 2μC/g. However, this amount of charge is too small for the toner to overcome van der Waals force, mirror image force, and adhesive force and fly due to the electric field. The developer toner 22 is carried on a carrier roller 30 in the rotational direction shown in the figure to the vicinity of the corona charger 28 . The corona charger 28 applies negative 4 to 5 kilovolts to the discharge wire 27, and generates a corona discharge between it and the grounded carrier roller 30, thereby achieving 0λ-
and CO3- ions are generated and absorbed ('1) by the developer toner 22 on the carrier roller 30. At this time, the carrier roller 3
0 is grounded, more ions are adsorbed to the developer toner 22 on the carrier roller 30. Therefore, the amount of charge of the developer toner 22 increases to about -10 μC/g, which is optimal for coating.

(The charged toner 22 is further conveyed by the rotation of the carrier roller 30 to a position facing the support 45. Since about 2 kilovolts is applied to the back surface of the support 45, the color developer The toner 22 flies toward the support in an electric field.At this time, the developer toner 22 is charged for 1 minute, so the toner 22 flies efficiently, and there is little toner of opposite polarity, so electrostatic coating is not possible. The support 45 coated with the color developer toner 22 evenly and uniformly is delivered to the pressure developing section 49 .

On the other hand, the capsule sheet 43 fed out from the capsule sheet roll 41 is exposed to light reflected from the original platen 12 in an exposure section 42 to form a latent image. It is further conveyed by a guide roller 47 and brought into contact with the support body 45 at a pressure developing section 49, and a pair of pressure developing rollers 48.4
8, the film is developed and colored by applying pressure at a linear pressure of several hundred kilograms. The colored support 45 is transferred to the fixing unit 50
The image is fixed by heating at 140° C., cut into a desired length by a cutter 51, and outputted from the outlet 11 as an image recording medium.

The color developer coating device of the present invention described in detail above is not limited to this embodiment, and modifications can be made without departing from the spirit thereof.

For example, in this example, an image was formed by electrostatically coating a color developer on a support and then contacting it with an exposed photosensitive pressure sensitive medium. It is also possible to form an image by electrostatically applying a color developer to the surface and then bringing it into contact with a support that is an image receptor.

Furthermore, although negatively charged toner is used in this embodiment, positively charged toner may also be used. In this case, of course, this can be handled by changing the polarity of the corona charger and the counter electrode. Further, similar effects can be expected even if an AC power source is used as the power source for applying the counter electrode.

[Effects of the Invention] As is clear from what has been described in detail below, according to the present invention, sufficient chargeability is imparted to the color developer, and its cohesion and f
19 A large amount of color developer can be stably applied to any support such as paper. Further, according to the image forming apparatus of the present invention, it is possible to output good images at high speed.

[Brief explanation of drawings]

The drawing shows an embodiment embodying the present invention, and is a configuration diagram of an embodiment of an image recording apparatus equipped with a developer coating device of the present invention. In the figure, 10: Exterior of the device, 1: Removal [,, 12: Document table, 20: Charge applicator, 21: Toner case,
22: Developer toner, 23: Brush part, 24:
Shaft part, 25: Charging roller, 26: Shield, 27: Discharge wire 28: Corona charger 29 counter electrode, 30: Support roller, 40
: exposure and development section, 41: capsule sheet roll,
42: Exposure part 43: Capsule sheet 44:
Support roll, 45: Support 46: Capsule sheet winding roll, 47: Guide roller, 48:
Pressure developing roller, 49: Pressure developing section, 50: Fixing unit, 51: Cuttable; negative power supply, Eλ
: Positive power supply, G: Ground

Claims (1)

[Scope of Claims] 1. A supporting means supporting a particulate color developer and disposed facing a support or a photosensitive pressure-sensitive medium; A corona charger for charging is provided, an electric field is formed between the support and the particulate color developer, and the particulate color developer is applied by flying onto the support or the photosensitive pressure-sensitive medium. Characteristic color developer application device. 2. The support coated with the particulate color developer and the photosensitive pressure-sensitive recording medium on which a latent image has been formed by exposure are stacked and pressed together using the developer coating device according to claim 1, thereby applying pressure on the support. An image forming device that forms images. 3. After forming a latent image by exposure, the photosensitive pressure-sensitive medium coated with the particulate color developer by the color developer coating device according to claim 1 is stacked on the support and pressurized to form a latent image on the support. An image forming device that forms an image on.