JPH03140954A - Device for applying color developer - Google Patents

Abstract

PURPOSE:To allow the application of a large amt. of a color developer on a base, such as plain paper, in a short period of time by providing a color developer carrying roller consisting of an insulating material, the core part of which consists of a metallic material and which is formed with many projections on the surface. CONSTITUTION:An electrode roller 1 is disposed to face, apart a prescribed spacing, the color developer carrying roller 6 which carries the electrified particulate color developer 8. The electrified particulate color developer 8 is splashed and deposited onto the base 4 transported by a transporting belt 2 which is put on the roller 1. The color developer carrying roller 6 is constituted by coating the surface of the metallic core part 31, which consists of a metal, such as aluminum, as its core material, with an insulating resin layer 30 formed with the many projections in the longitudinal direction. A large amt. of the color developer 8 can, therefore, be deposited and the generation of a electric discharge in the projecting parts is obviated. In addition, the formation of a strong electric field in the deep part of grooves is possible. The earlier application of a large amt. of the color developer 8 on the base 4, such as plain paper, is possible in this way.

Description

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

[Prior Art] In recent years, color copying machines have been used to expose microcapsule paper through an original, and then press the exposed microcapsule paper and developer paper coated with a color developer to produce the microcapsules. A type of image forming apparatus has appeared in which a color image is obtained on the color developer paper by reacting capsule paper with a color developer.

However, since such color developers are not versatile and difficult to obtain, devices have been devised that apply the color developer to a support such as plain paper.

In such a device, particulate color developer is charged and carried on a color developer carrying roller, an electrode roller is placed opposite to this color developer carrying roller at a predetermined interval, and the electrode roller is hooked onto the roller. The charged color developer is caused to fly by electrostatic attraction generated by an electric field formed between the color developer carrying roller and the support and applied to the support that is conveyed by a conveyor belt. It is something.

[Problems to be Solved by the Invention] However, such conventional color developer application devices charge the color developer by friction and cause the developer to be carried on the developer carrying roller. There has been a problem in that the amount of color developer carried on the colorant carrying roller is small, and therefore it is generally difficult to produce color developer paper in which a large amount of color developer is uniformly applied to the support.

On the other hand, if a large number of protrusions are formed on the developer-carrying roller so that a large amount of color developer is supported, the developer will be absorbed by the electrostatic attraction caused by the electric field generated between the electrode roller and the color-developer-carrying roller. When coating the support on the support, there was a problem in that discharge easily occurred at the protruding tip of the protrusion, making it difficult to coat the support.

The invention was made in order to solve the above-mentioned problems, and it is possible to carry a large amount of primary color agent and apply a large amount of color developer to a support such as plain paper in a shorter time. The purpose of the present invention is to provide a color developer coating device that is capable of applying a color developer.

[! Means for Solving Problem 1] To achieve this object, the developer coating device of the present invention has the following features:
A particulate developer is charged and carried on a developer carrying roller, an electrode roller is placed opposite the developer carrying roller at a predetermined interval, and the electrode roller is hooked by a conveyor belt F. The charged particulate color developer is applied by flying onto the conveyed support, and a metal material is coated in the core of the color developer carrying roller, and a large number of protrusions are coated on the surface. A developer carrying roller made of an insulating material and having a shape is provided.

[Function] In the developer coating device of the present invention having the above configuration, a large number of protrusions are formed on the circumferential surface of the developer carrying roller, so that a large amount of developer is applied to the developer carrying roller. It can support the agent.

In addition, since these protrusions are made of insulating resin, no discharge occurs at the protrusions (and since it is possible to form a strong electric field even in the deep part of the groove, color development is possible). The agent is applied efficiently.

Example 1 An example embodying the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a color developer coating device according to the present invention, and this color developer coating device 20 includes a casing 1
7 and a support conveyance unit 1 that conveys a support 4 such as plain paper 3 to which a color developer is applied.
4, and a developer supply unit 10 for applying a developer to the support 4.

The casing 17 of the developer coating device 20 is provided with an insertion port 12 into which the support 4 is inserted and a discharge port 11 through which it is discharged.

The support conveyance unit) 14 is equipped with a DC power source 5 connected to the electrode roller 1 for applying a predetermined high voltage to the electrode roller 1, and a conveyance a-23 disposed at a predetermined position, A conveyor belt 2 for conveying the support 4 is passed around the electrode roller 1 and the conveyor roller 3.

The color developer supply unit 10 includes a color developer carrying roller 6 that is grounded, and a color developer supplying roller 7 that is auxiliarily provided to cause the color developer carrying roller 6 to carry a color developer.
, a uniformizing blade 16 for adjusting the thickness of the layer of the color developer supported on the color developer support roller 6 to a predetermined thickness, and an excess color developer supported on the color developer support row 26. It consists of a removal blade 9 provided on the downstream side of the transfer area to remove the transfer area. Furthermore, particulate color developer 8 is stored in the hopper 15 of the color developer supply unit 10 . Then, the support conveyance unit 14 and the color developer supply unit 1
0 are opposed to each other with a predetermined distance d between them.

As shown in FIG. 2, the developer-carrying row 26 includes a metallic core member 31 made of a metal such as aluminum as a base material, and an insulating resin layer on the surface of which a large number of protrusions are formed in the longitudinal direction. It has a structure covered with 30. For example, a cylindrical insulating resin is poured into the metal core member 31, and
After that, protrusions are formed on the surface of the insulating resin. This protrusion is
For example, a knurled groove defined in JIS B 0951 may be used.

The developer coating device 20 configured as described above operates as follows.

When a driving means such as a motor (not shown) is driven, the developer carrying roller 6 and the developer supplying roller 7 rotate in the counterclockwise direction in FIG. The developer is conveyed to the vicinity of the developer carrying roller 6 by the supply roller ruff. As described above, this developer-carrying roller 6 has many protrusions formed on its circumferential surface, so the frictional force between the developer and the developer-carrying roller is large. The developer is taken into the groove, and a large amount of the developer is carried on the developer carrying roller 6. And equalizing blade 1
6, the color developer carried on the color developer carrying roller 6 is formed into a layer having a predetermined length.

At this time, since the color developer is made of dielectric material,
Individual particles or aggregates of color developer are charged by contacting or rubbing against other particles or aggregates. In this way, the developer is charged and the developer carrying roller 6
and is carried toward the transfer area 13.

On the other hand, a support 4 such as plain paper to which a color developer is applied is inserted into the casing 17 through the insertion opening 12, and is transported to the transfer area 13 by the transport belt 2 by rotation of the electrode roller 1 and transport roller 3. . The electrode roller 1 is made of metal, and a high voltage is applied to it by a DC power source 5.
Therefore, an electric field is generated in the transfer region 13. The charged color developer carried in a layer on the surface of the developer carrying roller 6 is attracted toward the electrode row 21 by electrostatic attraction according to the electric field generated in the transfer area 13. At this time, since the protruding portion of the developer carrying roller 6 is made of an insulating resin material, it is extremely difficult for discharge to occur even if the applied voltage is increased. It becomes possible to apply a large amount of colorant to the support 4.

In this way, the color developer is applied to the support 4. After that, there is a small amount of developer that was not attracted to the electrode roller 1 even by electrostatic attraction on the surface of the developer-carrying loaf 6, but these are removed when the tip of the grounded removal blade 9 is connected to the developer-carrying roller. By contacting the surface of 6, the charge is removed and the charge is also neutralized. The support 4 coated with the color developer is conveyed according to the operation of the support conveyance unit 14 and is discharged from the discharge port 11 to the outside of the casing 17 .

Next, an image forming apparatus using the color developer coating apparatus according to the present invention will be explained with reference to FIG.

FIG. 3 shows a color image recording apparatus 40 equipped with an embodiment of a color developer coating device according to the present invention. The recording device 40 has an exposure device 41, and this exposure device 41
has a halogen lamp 50, and this halogen lamp 50
A rotating color separation filter 51 for the three primary colors is provided below.

The document is placed on the document table 4 below the color separation filter 51.
The exposure device 41 exposes microcapsule paper (light-sensitive and pressure-sensitive paper) 44 running between a paper feed roll 42 and a take-up roll 43 through the document. Gamma idle rollers 53 are provided on the left and right sides of the document table 45, and the microcapsule paper 44 exposed by the exposure device 41 passes through the idle rollers 53, which are provided on the downstream side, into the pressure developing device 47. is supplied to

Further, the support 4 is transferred from the upper opening of the support cassette 58 to the color image recording device 40 by a feed row 259.
It is configured to be fed through an insertion port 12 into a color developer coating device 20 provided approximately at the center of the color developer coating device 20 .

8- In the pressure development device 47, the microcapsule paper 44 exposed by the exposure device 41 and the developer paper 48 whose support is coated with a developer by the developer coating device 20 are transferred to an idler roller 53. .54 are sent between the pressure rollers 55 of the pressure developing device 47 to be pressure developed, and the color image is transferred to the developer paper 48.
is formed. After the color developer paper 48 has been subjected to pressure development by the pressure developing device 47, the color developer paper 48 is subjected to a fixing action by a heat fixing device 49.

The microcapsule paper 44 that has passed through the pressure developing device 47 is wound up by a winding roller 43 .

The color developing paper 48 that has passed through the pressure developing device 55 passes through the guide roller 54, the heat fixing device 47, and is further processed.
It passes through idle rollers 56 and 57 and is discharged to the outside.

It should be noted that the developer coating device of the present invention described above is not limited to this embodiment, and modifications can be made within the scope of the invention. For example, in this embodiment, the protruding shape of the color developer carrying roller 6 is flat, but may be twill or mesh.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, it is possible to support a large amount of a charged color developer on the surface of the carrier, and as a result, the support of plain paper, etc. It is possible to more quickly and stably apply a larger amount of color developer to the body.

[Brief explanation of the drawing]

Figures 1 to 3 show examples embodying the present invention, Figure 41 is a schematic diagram of the developer coating device of the present invention, and Figure 2 is a developer-carrying device. FIG. 3 is a partially enlarged view of the rollers, and FIG. 3 is a schematic diagram of an image forming apparatus using the color developer coating device of the present invention. 1... Electrode roller, 2... Conveyance belt, 4... Support, 6... Color developer carrying roller, 8... Color developer, 3
0... Insulating resin layer, 31... Metallic core member.

Claims (1)

[Claims] 1. A developer having a means for supporting a particulate color developer, a means for transporting a support to which the developer is applied, and a voltage application means for forming an electric field between the support and the color developer. In the coloring agent coating device, the color developer supporting means is constituted by a carrier whose core is made of a conductive material and whose surface is made of an insulating material, and the insulating layer of the carrier has irregularities formed therein. A developer coating device characterized by: