JPH04240639A - Device for applying powder - Google Patents

Abstract

PURPOSE:To provide the device for applying power which can uniformly apply a color developer in a large amt. on a base. CONSTITUTION:The amt. of the color developer S to be supplied to a color developer carrying roller 22 is regulated by a circular cylindrical regulating roller 30 which comes into pressurized contact or contact with the peripheral surface of a supply roller 21 on the upstream side of the part where the color developer S is supplied to this supply roller 22 with respect to the rotating direction of the supply roller 21. The uniform application of the color developer S on plain paper P is possible in this way and the failure of the supply roller 21 and the regulating roller 30 is minimized.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to image recording, etc.
The present invention relates to a powder coating device for electrostatically coating charged powder onto a support such as plain paper.

0002

[Prior Art] Conventionally, as a type of color copying machine, a microcapsule paper is exposed to light, the microcapsule paper is superimposed on a developer paper, and then a desired image is recorded on the developer paper by pressure development. has been put into practical use, but the color developer paper used in this color copying machine was commercially available color developer paper coated with a color developer in advance. However, since using commercially available color developer paper is not versatile, it is difficult to use powder coating equipment that allows color copying machine users to easily create color developer paper using plain paper, for example. This is proposed in JP-A No. 2-90840.

[0003] In this device, a carrier such as a roller carrying a charged powdery 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 an electrostatic force. This is a device that coats a color developer onto a support.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned powder coating apparatus, since the blade is pressed against the carrier in order to regulate the color developer on the carrier, the color developer is There is a problem in that the color developer adheres strongly to the support, making it difficult for the developer to fly to the support in the transfer area, resulting in a reduced amount of coating. Moreover, if the blade is eliminated, the color developer is not uniformly supported on the support, and even if a large amount can be applied, there is a problem in that the color developer is applied unevenly on the support.

[0005]Also, it has been proposed to press a blade against the supply roller to prevent oversupply of the developer and to uniformly support the developer on the carrier, but generally the supply roller is made of a soft material such as a sponge. It is made of a material that is easily damaged by the blade.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a powder coating device that can uniformly coat a large amount of a color developer onto a support.

[0007]

[Means for Solving the Problems] In order to achieve this object, the powder coating device of the present invention includes a carrier for carrying powder and a supply roller for supplying the powder to the carrier. It has a roller that is in contact with the supply roller.

[0008]

[Operation] The roller in contact with the supply roller regulates the amount of color developer supplied from the supply roller to the carrier, so that the developer can be uniformly carried on the carrier. Thereby, the color developer can be uniformly applied to the support.

[0009]

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

First, the configuration of a color image recording apparatus M equipped with a powder coating apparatus of this embodiment will be explained with reference to FIGS. 1 and 2.

As shown in FIG. 1, a color image recording apparatus M
The apparatus is roughly divided into an exposure device 1, a powder coating device 2, a pressure developing device 3, and a heat fixing device 4.

[0012] An exposure device 1 is provided on the upper part of the casing C of the color image recording apparatus M. This exposure device 1
is a halogen lamp 8 that exposes the microcapsule paper 7.
and a document table 11 located below the halogen lamp 8 and on which a document 10 is placed. Here, a latent image is formed on the microcapsule paper (photosensitive pressure sensitive paper) 7 by exposure.

A pressure developing device 3 is provided below the exposure device 1. The microcapsule paper 7 exposed by the exposure device 1 is fed into the pressure developing device 3 via a guide roller 12. This pressure developing device 3 is composed of a pair of pressure rollers 14 that sandwich the superimposed color developer paper and microcapsule paper 7 and develop them under pressure.

On the other hand, a powder coating device 2 is provided in the center of the casing C of the color image recording device M. A paper feed cassette 18 is provided on the right side of the powder coating device 2 and stores plain paper P in a stacked manner.The plain paper P is inserted into the powder coating device 2 from an insertion opening 29 by a guide roller 19. The inserted plain paper P is electrostatically coated with powdered color developer S to become color developer paper. The developing paper discharged from the outlet 28 is conveyed by the guide roller 13, and then superimposed on the microcapsule paper 7 on which the latent image has been formed, and supplied into the pressure developing device 3, where it is pressure developed.

A thermal fixing device 4 is provided on the downstream side of the pressure developing device 3, and the developing paper subjected to pressure development is conveyed to the thermal fixing device 4 by a guide roller 15. The heat fixing device 4 heats and fixes the recorded image on the color developing paper on which the recorded image has been formed. The color developing paper on which the image has been fixed by the thermal fixing device 4 is further conveyed by a guide roller 16 and discharged to the outside of the color image recording apparatus M.

It should be noted that the microcapsule paper 7 is
The liquid is supplied from the air, passes through each guide roller and pressure roller 14, and is wound onto a winding roll 6.

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

The powder coating device 2 includes a developer carrying roller 2.
2, an electrode roller 23 arranged at a predetermined distance from the developer carrying roller 22, and a conveyor belt 24 that is stretched around the electrode roller 23 and guide rollers 25a and 25b.

A part of the developer carrying roller 22 is placed inside a developer case 20 that stores the granular developer S. This color developer carrying roller 22 is grounded,
The electrode roller 23 is connected to a power source 26. As a result, a coating electric field is applied to both rollers 22 and 23.

Furthermore, on the outer periphery of the developer carrying roller 22,
A rotatable supply roller 21 made of foamed sponge is brought into pressure contact with the developer-carrying roller 22 upstream from the position of the developer-applying area 27 in the rotational direction of the developer-carrying roller 22. It is set up like this.

Further, a color developer S is stored inside the color developer case 20, and in order to regulate the amount of color developer S that is applied to the supply roller 21, the color developer S is A cylindrical regulation roller 30 is rotatably supported on the upstream side of the portion where the color developer S is supplied to the carrier roller 22 in pressure contact with or in contact with the circumferential surface of the supply roller 21 . Depending on the degree of pressure contact between the supply roller 21 and the regulation roller 30, the amount of the color developer S placed on the supply roller 21 can be regulated. The regulating roller 30 is made of resin, rubber, metal, or the like. Note that the supply roller 21 may be brush-shaped.

An agitator 31 is rotatably supported within the developer case 20. This agitator 3
1 is composed of a rotating shaft and plate-shaped wings protruding from the circumferential surface of the rotating shaft. The agitator 31 is rotated by a drive device (not shown), so that the developer case 2
The color developer S in 0 is stirred. Note that the wings may be flat or comb-like. Also, the number of pieces may be any number.

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

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 document 10 is formed by exposure on a portion of the microcapsule paper (photosensitive and pressure-sensitive paper) 7 running 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, when the start switch is pressed, the agitator 31 is rotated and the color developer S is agitated and reaches the supply roller 21. A regulation roller 3 that rotates together with the supply roller 21
0 is in pressure contact with the supply roller 21, so that the excess developer S on the supply roller 21 that is supplied to the developer carrying roller 22 is dropped by the regulation roller 30.
An appropriate amount of the color developer S reaches the color developer carrying roller 22.

[0026] Since the regulating roller 30 rotates together with the supply roller 21, local wear does not occur on the regulating roller 30.

[0027] Then, the developer adheres to the developer carrying roller 22 and is conveyed to the coating area 27. At this time, the color developer S
is electrically charged by contact with the developer carrying roller 22 and the supply roller 21. On the other hand, the plain paper P is inserted into the powder coating device 2 through the insertion opening 29 by the guide roller 19.

The inserted plain paper P is conveyed to the coating area 27 by the conveyor belt 24. Here, an electric field suitable for the polarity of the charged developer S is applied to the electrode roller 23 by the power source 26, so that the charged developer S is transferred from the developer carrying roller 22 to the plain paper P by electrostatic force. It flies and is applied electrostatically to become color developing paper.

The developing paper discharged from the outlet 28 is conveyed by the guide roller 13, and is then superimposed on the exposed microcapsule paper 7 and supplied into the pressure developing device 3. The microcapsule paper 7 and color developer paper supplied to the pressure developing device 3 are sandwiched between a pair of pressure rollers 14 and subjected to pressure development, and a color image is recorded on the color developer paper.

The color developing paper subjected to pressure development by the pressure developing device 3 is conveyed to the heat fixing device 4 by a guide roller 15. The color developer paper is heated by the heat fixing device 4, and the recorded image on the color developer paper is fixed. The color developing paper with the fixed image is further conveyed by a guide roller 16 and discharged to the outside of the color image recording apparatus M.

Next, another embodiment will be explained with reference to FIG. In the powder coating apparatus of this embodiment, the same parts as those of the apparatus of the previous embodiment are designated by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the regulating roller 30 is rotatably supported by a support plate 31, and the support plate 31 is supported by a shaft 3.
3 is rotatably supported. Further, the support plate 31 is in contact with the eccentric cam 32.

When the eccentric cam 32 is rotated by a drive source (not shown), the support plate 31 is brought together and the regulation roller 3 is rotated.
0 goes up and down. With these, the pressing force changes, and the amount of color developer S on the supply roller 21 can be adjusted.

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

For example, instead of applying the color developer S onto the plain paper P, it may be applied onto the microcapsule paper 7 on which the latent image has been formed.

[0036]

[Effect of the invention] As is clear from the detailed description above,
According to the present invention, by pressing the regulating roller against the supply roller, the amount of color developer supplied from the supply roller to the carrier can be adjusted, and the developer can be uniformly supported on the carrier. Thereby, the color developer can be uniformly applied to the support, and damage to the supply roller and the regulating member can be kept to a minimum. In other words, it is possible to provide a powder coating device that can stably coat a large amount of color developer onto a support with a very inexpensive configuration, which is a significant industrial effect.

[Brief explanation of the drawing]

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

FIG. 2 is a configuration diagram of a powder coating device.

FIG. 3 is a configuration diagram of a powder coating device according to another embodiment.

[Explanation of symbols]

2 Powder coating equipment 21 Supply roller 22 Color developer carrying roller (carrier) 30 Regulation roller S Color developer (powder) P Plain paper (support)

Claims (1)

[Claims] Claim 1: A powder coating device that electrostatically coats charged powder by flying it onto a support, which comprises: a carrier for carrying powder; and a supply for supplying the powder to the carrier. A powder coating device comprising: a roller; and a roller that is brought into contact with the supply roller on the upstream side of a portion that supplies the powder to the carrier with respect to the rotational direction of the supply roller. .