JPH0519437A - Powder applying device - Google Patents

Abstract

(57) [Summary] [Object] To provide a powder coating apparatus capable of uniformly coating a color developer on a support. [Structure] When a powder is applied to a support, when a powder is supplied to a support, a magnetic field is applied in a direction perpendicular to the moving direction of the powder, so that a powder of a single polarity is created by Lorentz force. Only the powders having the same polarity are carried on the carrier due to the force of moving only the carrier to the carrier, so that the coating thickness can be easily controlled and the coating unevenness can be reduced. Thereby, the powder can be uniformly applied to the support. That is, it is possible to provide a powder coating apparatus which can stably coat the color developer on the support with a very inexpensive structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to image recording and the like.
The present invention relates to a powder coating device for electrostatically coating charged powder on a support such as plain paper.

[0002]

2. Description of the Related Art Conventionally, as one of color copiers, a microcapsule paper is exposed to light, a developing paper is superposed on the paper, and pressure development is performed to record a desired image on the developing paper. However, as the developer used in this color copying machine, a commercially available developer coated with a developer in advance was used. However, since it is not versatile to use commercially available color developing paper, a powder coating apparatus that allows a user of a color copying machine to easily produce color developing paper by using plain paper, etc. It is disclosed in Kaihei 2-90840.

In this apparatus, a carrier such as a roller carrying a charged powder color developer is opposed to a support such as plain paper in a non-contact state, and an electric field is generated there to generate electrostatic force. Is a device for applying a color developer onto a support.

[0004]

However, in the powder coating apparatus as described above, it is difficult to supply the powder of the same polarity onto the carrier, which makes it difficult to control the coating thickness and coating unevenness. Was the cause of.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a powder coating apparatus capable of uniformly and stably applying a color developer on a support. ..

[0006]

To achieve this object, the powder coating apparatus of the present invention applies a magnetic field in a direction perpendicular to the moving direction of the powder when the powder is supplied to the carrier. It is characterized by the addition.

[0007]

According to the powder coating apparatus of the present invention having the above structure, when the powder is supplied to the carrier, the Lorentz force is exerted by applying the magnetic field in the direction perpendicular to the moving direction of the powder. As a result, the powder of the same polarity is supported on the carrier by receiving the force that only the powder of a single polarity moves to the carrier.

As a result, the powder can be uniformly applied to the support.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the structure of a color image recording apparatus M including the powder coating apparatus of this embodiment will be described with reference to FIG.

The color image recording device M is roughly composed of an exposure device 1, a powder coating device 2, a pressure developing device 3 and a heat fixing device 4.

An exposure device 1 is provided above the casing C of the color image recording device M. This exposure apparatus 1
Is a halogen lamp 8 for exposing the microcapsule paper 7
And a document table 11 which is located below the halogen lamp 8 and on which the document 10 is placed. Here, a latent image is exposed and formed on the microcapsule paper (photosensitive pressure sensitive paper) 7.

A pressure developing device 3 is provided below the exposure device 1. The microcapsule paper 7 exposed by the exposure device 1 is supplied into the pressure developing device 3 via the guide roller 12. The pressure developing device 3 is composed of a pair of pressure rollers 14 for sandwiching the superposed color paper and the microcapsule paper 7 to perform pressure development.

On the other hand, the powder coating device 2 is provided in the central portion of the casing C of the color image recording device M.
On the right side of the powder coating device 2, a paper feed cassette 18 for stacking and storing plain papers P is provided, and the plain paper P is inserted into the powder coating device 2 from an insertion port 29 by a guide roller 19. The plain paper P thus inserted is electrostatically applied with the powder-form color developer S to become a color-developing paper. Then, the color paper discharged from the take-out port 28 is conveyed by the guide roller 13 and then superposed on the microcapsule paper 7 on which the latent image is formed and supplied into the pressure developing device 3 to be pressure-developed.

A thermal fixing device 4 is provided on the downstream side of the pressure developing device 3, and the color paper after the pressure development is conveyed to the thermal fixing device 4 by the guide roller 15.

The heat fixing device 4 heats and fixes the recorded image on the color-developed paper on which the recorded image is formed. The color paper on which the image is fixed by the heat fixing device 4 is further conveyed by the guide roller 16 and discharged to the outside of the color image recording device M.

The microcapsule paper 7 is a paper feed roll 5.
It is supplied from the winding roller 6 through the respective guide rollers and the pressure roller 14.

Next, the powder coating device 2 will be described in detail with reference to FIG.

The powder coating device 2 includes a developer carrying roller 2
2, an electrode roller 23 disposed apart from the developer carrying roller 22 by a certain distance, and a conveyor belt 24 stretched around the electrode roller 23 and the guide roller 25. A part of the developer carrying roller 22 is arranged inside the developer case 20 that stores the granular developer S. The developer carrying roller 22 is grounded,
The electrode roller 23 is connected to the power supply 26. As a result, a coating electric field is applied to both rollers 22 and 23.

Further, on the outer periphery of the developer carrying roller 22,
A supply roller 21 rotatable from the position of the developer application area 27 to the upstream side with respect to the rotation direction of the developer carrying roller 22.
Are provided so as to come into pressure contact with the developer carrying roller 22. At this time, the magnetic field Y is applied in the direction perpendicular to the rotation direction X at the portion of the supply roller 21 in contact with the developer carrying roller 22 (from the front to the direction perpendicular to the paper surface). A developer S is stored inside the developer case 20.

Drive motors (not shown) for the developer carrying roller 22, the supply roller 21, and the electrode roller 23 are connected to the controller 60. The power source 26 is also connected to the controller 60.

Next, the operation of the color image recording apparatus M will be described.

After placing the original 10 on the original table 11, the user presses a start switch (not shown) to start image recording. Then, the halogen lamp 8 is turned on, and a latent image of the original 10 is exposed and formed on a part of the microcapsule paper (photosensitive pressure sensitive paper) 7 that runs between the paper feed roll 5 and the take-up roll 6. The microcapsule paper 7 exposed by the exposure device 1 is supplied into the pressure developing device 3. On the other hand, in the powder coating apparatus, each motor is driven by a signal from the controller 60 by pressing the start switch.

First, the plain paper P is inserted into the powder coating device 2 from the insertion port 29 by the guide roller 19. The inserted plain paper P is transported to the transfer area 27 by the transport belt 24 by driving the electrode roller 23. At this time,
The power supply 26 is turned on before the plain paper P enters the transfer area 27.

A sensor (not shown) judges the instant when the plain paper P enters the transfer area 27, and the developer carrying roller 2
2 and the supply roller 21 are driven. By driving these, the developer S is agitated, most of it is negatively charged, and reaches the supply roller 21. Then, it is supplied to the developer carrying roller 22 by the supply roller 21.

At this time, the magnetic field Y is applied in the direction perpendicular to the rotation direction X at the portion of the supply roller 21 in contact with the color developer carrying roller 22 (from the front to the direction perpendicular to the paper surface). As a result, only the developer S that is negatively charged by the Lorentz force is transferred from the supply roller 21 to the developer carrying roller 22.
Move to.

Then, the developer S adheres onto the developer carrying roller 22 and is conveyed to the transfer area 27. At this time, all the developers S are negatively charged.

An electric field suitable for the polarity of the charged developer S is applied in advance to the electrode roller 23 by the power source 26, so that the developer S charged by electrostatic force is transferred from the developer carrier roller 22. Fly to plain paper P.

Then, the moment when the plain paper P leaves the transfer area 27 is judged by a sensor (not shown), and the developer carrying roller 22 and the supply roller 21 are turned off. After that, power supply 2
6 is turned off, and the plain paper P is ejected from the ejection port 28, and then the electrode roller 23 is turned off.

The color developing paper discharged from the take-out port 28 is conveyed by the guide roller 13 and then superposed on the exposed microcapsule paper 7 to form the pressure developing device 3.
Supplied within. The microcapsule paper 7 and the color developing paper supplied to the pressure developing device 3 are sandwiched between a pair of pressure rollers 14 and pressure-developed, and a color image is recorded on the color developing paper. The color paper that has been pressure-developed by the pressure developing device 3 is conveyed to the thermal fixing device 4 by the guide roller 15. The color developing paper is heated by the heat fixing device 4, and the recorded image on the color developing paper is fixed. The color paper on which the image is fixed is further conveyed by the guide roller 16 and discharged to the outside of the color image recording apparatus M.

The present invention is not limited to the embodiments described above in detail, and various modifications can be made without departing from the spirit of the invention.

For example, instead of applying the developer S on the plain paper P, the developer S may be applied on the microcapsule paper 7 on which the latent image is formed.

[0033]

As is clear from the above description,
According to the present invention, since powders having the same polarity can be supplied onto the carrier, it is possible to easily control the coating thickness and reduce coating unevenness. Thereby, the powder can be uniformly applied to the support. That is, there is an industrially significant effect that it is possible to provide a powder coating device that can stably coat the color developer on the support with a very inexpensive structure.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a color image recording device to which a powder coating device is applied.

FIG. 2 is an enlarged cross-sectional view of a powder coating device.

[Explanation of symbols]

 2 powder coating device 21 supply roller (supply body) 22 developer carrier roller (support body) 26 power supply (electric field) S developer (powder) P plain paper (support) X moving direction Y magnetic field

Claims (1)

Claim: What is claimed is: 1. A powder coating apparatus configured to fly electrostatically on a carrier from a carrier that carries charged powder, and supply the powder to the carrier. At this time, the powder coating apparatus is characterized in that a magnetic field is applied in a direction perpendicular to the moving direction of the powder.