JPH02262145A - Developer coating 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 a developer coating device for applying a granular developer to a support such as plain paper that supports the developer in image recording. .

[Conventional technology]

Recently, color copying machines have been used to expose microcapsule paper through an original, and then feed the exposed microcapsule paper and developer paper, which has a support such as plain paper coated with a color developer, into a pressure developing device. A new type of technology has appeared in which the color image on microcapsule paper after exposure is transferred onto developer paper, and the developer paper after pressure development is sent to a heat fixing device to obtain a color image on the developer paper. .

The color developer paper is made by coating a color developer such as acid clay and a binder on a support such as plain paper. As a colorant coating device, there is a type of device that coats a granular color developer onto a support such as plain paper using a charging effect.

That is, as shown in FIG. 6, the known color developer application device includes a color developer tank 50 for storing granular color developer S.
In the developer tank 50, there are provided a rotating developer carrying roller 52 and a replenishment roller 51 which is provided in pressure contact with the developer carrying roller 52. The color developer carrying roller 52 and the replenishment roller 51 rotate with each other and are frictionally charged on their contact surfaces to positively charge the color developer S, and this positively charged color developer S becomes a color developer. It adheres to the circumferential surface of the carrier roller 52 and is attracted toward the opposing roller 53 provided opposite to the developer carrier roller 52 .

A negative voltage is applied to the opposing roller 53, and the conveyor belt 54 runs between the opposing roller 53 and a guide roller 55, 55 spaced apart behind the opposing roller 53. A support P that supports the color developer S, such as plain paper, is adsorbed and conveyed to the conveyor belt 54, and the developer carrying roller 52
At a position closest to the opposing roller 53, for example, positively charged granular color developer S is transferred and adhered onto the support P to form a color developer layer m.

[Problem to be solved by the invention]

However, according to the conventional color developer application device described above, the amount of charge of the color developer S changes due to changes in temperature and humidity.
Accordingly, there is a problem in that the amount of coating on the support P changes.

That is, for example, when the humidity increases due to an increase in temperature, the amount of charge decreases and the amount of developer S applied decreases, making the developer layer thinner than at room temperature. As described above, there is a problem in that the applied amount of the color developer S changes due to changes in temperature and humidity, making it impossible to obtain a stable image.

The present invention was made to solve the above-mentioned problems, and its purpose is to always maintain a constant amount of color developer applied to the support even when the temperature and humidity change. It is an object of the present invention to provide a color developer coating device that can obtain stable images.

[Means to solve the problem]

In order to achieve this object, the color developer coating device according to the present invention is a color developer coating device for image recording in which granular color developer is transferred and attached to a support.
It has a temperature/humidity detecting means for detecting temperature/humidity, and a coating amount adjusting device for adjusting the coating amount of the color developer onto the support according to the temperature/humidity.

[Effect]

The present invention configured as described above has a temperature/humidity detection means for detecting temperature/humidity and a coating amount adjusting device for adjusting the coating amount, and the color developer S
Adjust the amount of coating on the support. In this way, even if the temperature and humidity change, the amount of color developer applied can be kept constant and a stable image can always be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a color image recording apparatus M equipped with an embodiment of the color developer coating apparatus according to the present invention. A microcapsule paper (light-sensitive and pressure-sensitive paper) 7 running between a take-up roll 6 and an original 10 is exposed to light. Approximately at the center of the casing C of the color image recording device M,
A developer coating device 2 is provided, and a pressure image device 3 is provided near the developer coating device 2.

In this pressure development device 3, the microcapsule paper 7 exposed by the exposure device 1 and the developer paper whose support P is coated with a developer S by the developer coating device 2 are superimposed and subjected to pressure development. Then, the color image on the microcapsule paper 7 is transferred to the color developing paper. The color developing paper subjected to pressure development by the pressure developing device 3 is sent to a heat fixing device 4, and this heat fixing device 4 performs a fixing action on the color developing paper.

The exposure device 1 has a halogen lamp 8. Below the halogen lamp 8, a rotating color separation filter 9 for three primary colors is provided. It is placed on. Guide rollers 12.12 are provided on the left and right sides of this document table 11,
The microcapsule paper 7 exposed at the lower part of the exposure device 1 is further fed into the pressure developing device 3 via guide rollers 12, 12 provided downstream thereof.

The developer paper coated with the developer S on the support P by the developer coating device 2 is superimposed on the microcapsule paper 7 by the guide roller 13, and then transferred to the pressure rollers 14, 14 of the pressure development device 3. A pressure developing action is performed by the pressure of this pressure roller 14.

The microcapsule paper 7 that has passed through the pressure development device 3 is wound up by a take-up roller 6, and the color developer paper that has passed through the pressure development device 3 passes through the heat fixing device 4 via a guide roller 15, and is further The light passes through the guide roller 16 and is detected outside.

As shown in detail in FIG. 2, the color developer application device 2 includes a color developer carrying roller 21 and a conductive roller 22 disposed at a predetermined distance from the developer carrying roller 21. A support P such as plain paper is conveyed through the gap between the rollers 21 and 22 while being in contact with a conveyor belt 24 wound around the conductive roller 22 and the belt roller 23 .

The color developer carrying roller 21 is disposed on the side of a color developer case 25 that stores the granular color developer S, and is attached at a position where it contacts the transport path of the support P with a certain space. There is. Transfer electrolysis is applied between the developer carrying roller 21 and the conductive roller 22 by a power source E. Further, a rotatable developer supply roller 31 is disposed on the outer periphery of the developer carrying roller 21 in the upstream direction with respect to the rotational direction of the developer carrying roller 21 from the position of the developer transfer area 27. It is provided so as to be in pressure contact with the colorant carrying roller 21. The developer supply roller 31 is covered with the developer case 25 as described above. Further, an insertion opening 39 into which the support P is inserted is provided on the side of the exterior 35 of the color developer coating device 2.
And an outlet 38 for taking out the support P is provided.

Furthermore, a conveyor belt 24 is stretched around a conductive roller 22 and a belt roller 23 inside the color developer coating device 2, and the support P inserted through the insertion opening 39 is passed through the developer transfer area 27 and then passed through the extraction port 38. It is configured to be transported towards.

On the other hand, a temperature/humidity detection means 40 is arranged above the color developer coating device 2, and a control means 41 is connected to the detection means 4o. Then, the control means 41 controls the conductive roller 22
is connected to change the rotation speed via a rotation control mechanism.

The coating amount adjusting device here includes a control means 41, a rotation control mechanism, and a rotation mechanism for the conductive roller 22.

The developer carrying roller 21 and the developer supplying roller 31
As the color developer S rotates, the color developer S comes in contact with and is charged by friction, and the uniformly charged color developer S is deposited on the color developer carrying roller 21 .

On the other hand, the support P inserted through the insertion opening 39 is transported to the developer transfer area 27 by the transport belt 24 . Then, by applying an electric field suitable for the polarity of the charged color developer S, the charged color developer S moves from the developer carrying roller 21 onto the support P and adheres thereto.

At this time, since the amount of charge of the color developer S changes depending on the temperature and humidity inside the apparatus, the amount of the color developer S attached to the developer carrying roller 21 also changes. For example, temperature increases, humidity increases,
When the temperature and humidity are high, the amount of charge decreases and the amount of color developer S attached decreases.

Therefore, by controlling the feeding speed of the support P (rotational speed of the conductive roller 22) to a value suitable for the temperature and humidity using the control means 41, the color developer S is applied to the support P to a constant thickness.

Thereafter, the support 8 with the color developer S attached to its surface is discharged from the outlet 38.

Next, FIG. 3 shows a second embodiment of the developer coating device 2 of the present invention. Components that perform the same functions as those in the first embodiment will be described using the same reference numerals. In this example, the first
The difference from the embodiment is that instead of changing the rotation speed of the conductive roller 22, the rotation speed of the color developer carrying roller 21 is changed via a rotation control mechanism. A temperature/humidity detection means 40 is arranged above the color developer application device 2, and a control means 41 is connected to the detection means 40 to change the rotation speed of the color developer carrying roller 21 according to the temperature and humidity detected by the detection means 40. There is. The control means 41 is connected to the developer carrying roller 21 . The coating amount adjusting device here includes a control means 41, a rotation control mechanism, and a rotation mechanism for the developer carrying roller 21. With this configuration, the color developer S is applied onto the support P at a constant thickness by controlling the control means 41 to control the rotational speed of the color developer carrying roller 21 to a value suitable for the temperature and humidity. be able to.

FIG. 4 shows a third embodiment of the developer coating device 2 of the present invention. In this embodiment, the developer case 25 is moved via a moving mechanism according to the detected temperature and humidity to control the gap between the developer carrying roller 21 and the conductive roller 22. .

The coating amount adjusting device here includes a moving mechanism and a control means 41. That is, based on the temperature and humidity detected by the temperature and humidity detection means 40, the signal from the control means 41
The developer case 25 is moved to control the space between the conductive roller 22 and the developer carrying rollers 2 and 1, and the developer S
can be applied onto the support P at a constant thickness.

FIG. 5 shows a fourth embodiment of the developer coating device 2 of the present invention.

In this embodiment, the control means 41 controls the variable voltage device E.
1, and the transfer electric field between the color developer conveyance roller 21 and the support roller 22 is controlled via a control mechanism based on the temperature and humidity detected by the temperature and humidity detection means 40.

The coating amount adjusting device here includes a control means 41 and a transfer electric field control mechanism. By changing the transfer electric field depending on the temperature and humidity, the applied amount of color developer S is changed and the color developer S is always kept constant.
can be applied.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a temperature/humidity detecting means for detecting temperature/humidity, a control device for adjusting the temperature/humidity onto a support according to the temperature/humidity, a rotating mechanism for a conductive roller, and a color developer. It has a coating amount adjustment device consisting of a rotating mechanism for the carrying roller, a moving mechanism for the developer case, and a controlling mechanism for the transfer electric field, so it is possible to deposit a constant thickness on the support surface regardless of the temperature and humidity inside the device. A stable image can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a color image recording apparatus to which a color developer coating device of the present invention is applied, FIG. 2 is a configuration diagram showing a first embodiment of the color developer coating device of the present invention, and FIG. The figure is a configuration diagram showing the second embodiment, FIG. 4 is a configuration diagram showing the third embodiment,
FIG. 5 is a block diagram showing a fourth embodiment, and FIG. 6 is a block diagram of a conventional color developer coating device. 1... Exposure device, 2... Color developer coating device, 3...
Pressure developing device, 4... Heat fixing device, 21... Color developer carrying roller, 22... Conductive roller, 24... Conveyance belt, 40... Detection means, 41... Control means. Applicant's representative: Yasushi Ishikawa

Claims (1)

[Claims] In a color developer applicator for image recording, which transfers granular color developer and makes it adhere to a support, temperature and
A color developer coating device comprising: a temperature/humidity detection means for detecting humidity; and a coating amount adjusting device for adjusting the coating amount of a color developer onto a support depending on the temperature/humidity.