JPH02141746A - Device for applying color developer - Google Patents

Abstract

PURPOSE:To stick a large amt. of a color developer to a base in a transfer region by providing a charger which previously charges the base to the polarity reverse from the charge polarity of the color developer on the upstream side of a color developer charging and applying part which electrosatically attracts and applies the color developer after charging on the base. CONSTITUTION:The color developer charging and applying part which is so constituted that the color developer 2 is subjected to contact and triboelectrostatic charging and the uniformly charged color developer 2 sticks to a color developer transporting roller 5, then the color developer 2 sticking to the roller 5 is electrostatically attracted to the roller 5 by the transfer electric field generated by a power source E1 is provided. The charger 7 which charges the base 1 is disposed on the upstream side of the color developer charging and applying part. A power source E2 is connected to the charger 7 and the base 1 is charged to the polarity reverse from the charge polarity of the color developer 2. The color developer 2 is held and transported on and by the base 1 by sufficient adhesive strength in this way and the good images which are free from picture element drop-outs are obtd.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a color developer for creating an image forming medium having a color developer by adhering the color developer to the surface of a support such as plain paper. The present invention relates to a coating device.

[Conventional technology]

In the past, image forming media were generally shipped from paper manufacturers as products, so it was not possible for the user to form an image on a support such as plain paper that was arbitrarily selected by the user. However, it has been quite difficult to create an imaging medium by applying a color developer to any selected support. For this reason, there has been a strong desire to develop an image forming medium manufacturing apparatus that can be easily used by general users.

In order to meet this request, the applicant first applied for
No. 6003 includes microcapsule paper that encapsulates a dye precursor and carries microcapsules whose mechanical strength changes in response to light, and is exposed to light according to image information, and plain paper selected by the user. and an image forming medium prepared by adhering a color developer to the surface of any support such as, and then destroying the microcapsules with lower mechanical strength on the microcapsule paper by pressure development, We have proposed a system in which the dye precursor that flows out due to this destruction is reacted with a color developer to form an image on the support.

The color developer application device used here for creating an image forming medium by attaching the color developer to a support charges the color developer to a positive (+) level using, for example, contact or friction. At the same time, by arranging an electrode on the back side of the support to which a voltage of opposite polarity, for example, negative (-) is applied, facing this charged part, the charged color developer is statically applied to the entire surface of the support. It was designed to be applied by electrical suction.

[Problem to be solved by the invention]

However, in the above case, when the charged color developer is electrostatically moved and adsorbed toward the support, the color developer is firmly attached to the support, but the electrostatic force is If the support is carried out from the working area, the adhesion force will rapidly weaken, and as a result, the developer may fall off the support during transport, or the support to which the developer has been attached ( When performing pressure development by bringing the image forming medium (image forming medium) and microcapsule paper into pressure contact, the color developer adheres to the side of the microcapsules, and as a result, no image is formed on the support, or the support It has been found that there is a problem that pixels may be missing in the image formed on top.

The present invention was made in order to solve the above-mentioned problems, and after attaching the color developer to a support, the color developer is stabilized until it is brought into close contact with microcapsule paper and pressure development is performed. It is an object of the present invention to provide a color developer coating device which allows microcapsules to be conveyed while being attached to a support, and which prevents the developer from adhering to the side of a microcapsule table during pressure development.

(Means for Solving the Problems) In order to achieve the above object, the developer coating device of the present invention has the following features:
In a developer coating device that creates an image forming medium by attaching a developer to the surface of a support, the developer is charged and the charged developer is electrostatically attracted to the support. The color developer is provided with a charging application section for applying the color developer, and a charger that is disposed on the entrance side of the developer charging application section and that charges the support in advance to a polarity opposite to the charging polarity of the color developer. It is characterized by:

[Effect]

According to the present invention having the above configuration, the support is forcibly charged to a polarity opposite to that of the color developer by the charger during transportation, so that the transfer efficiency of the color developer to the support is improved. increases, and a large amount of color developer adheres to the support. Moreover, in the transfer area, the developer moves and adheres to the support due to an external electric field, and is then transported together with the support. Since it is charged with a polarity opposite to the charging polarity, the color developer can be firmly attached to the support.

〔Example〕

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

The drawing is a sectional view showing a schematic configuration of a copying machine equipped with an embodiment of a color developer coating device according to the present invention.

In the figure, an insertion slot 12 for inserting a support 1 such as plain paper and an ejection port 13 for taking out the support 1 are provided on the side of the device 4, and an original plate is provided at the top of the device 4. 20
is provided. Further, inside the device, a support conveyance roller 3 and an auxiliary roller 11 are rotatably supported, and a conveyance belt 4 for conveying the support 1 11 is stretched here, and is inserted through the insertion opening 12. The support body 1 is configured to be conveyed along the running of the conveyor belt 4 through the developer coating area 9 toward the outlet 13 .

Further, above the conveyor belt 4, a microcapsule paper 15 carrying microcapsules encapsulating a dye precursor and configured to change mechanical strength in response to light is wound around a capsule sheet roll 16. The exposed microcapsule paper 15 is brought into pressure contact with the support 1 coated with the color developer 2 in a pressure developing section 21 and then wound up by a take-up roller 22 .

In the color developer transfer area 9, a rotatable color developer transport roller 5 is attached at a position where its outer peripheral surface contacts the transport path of the support 1 with a certain space, and this color developer transport roller 5 A transition electric field is applied between the support conveyance roller 3 and the support conveyance roller 3 by a power source E1. Further, a rotatable developer supply roller 6 is in pressure contact with the developer transport roller 5 in the direction upstream from the position of the developer transfer area 9 with respect to the rotational direction of the developer transport roller 5. It is provided. The color developer supply roller 6 is covered with a toner case 8, and the color developer 2 is contained in the toner case 8.
is stored. These portions constitute a developer charging application section.

Further, according to this embodiment, a charger 7 for charging the support 1 is provided upstream of the developer charging application section, and a power source E2 is connected to the charger 7. has been done. A corotron, a brush charger, or the like is used as the charger 7, and the support 1 is thereby charged to a polarity opposite to that of the color developer 2.

Then, due to the rotation of the developer transport roller 5 and the developer supply roller 6, the developer 2 comes into contact and is frictionally charged, and this uniformly charged developer 2 adheres to the developer transport roller 5. , the color developer 2 attached to the color developer transport roller 5 is electrostatically attracted to the support 1 by a transferred electric field generated by a power source E1.

At this time, according to this embodiment, since the support 1 is charged in advance by the charger 7 to a polarity opposite to that of the color developer 2, in addition to the transfer force due to the transfer electric field from the external power source Ex, Since the electrostatic force caused by this charging acts, the color developer 2 is attached very efficiently. Further, even after the developer 2 is applied and the support 1 leaves the outlet side of the developer charging application section, the support 1 is charged by the charger 7 to a polarity opposite to that of the developer 2. Because of this, it is transported while maintaining a high adhesion force. For this reason, from support 1 to developer 2
Even if there is charge injection into the support 1, the color developer 2
It is firmly attached to the surface by electrostatic force and is almost prevented from falling off.

Next, the operation of the above-mentioned copying machine will be explained.

By the rotation of the developer transport roller 5 and the developer supply roller 6, the developer 2 comes into contact and is frictionally charged, and the uniformly charged developer 2 is deposited on the developer transport roller 5.

On the other hand, the support 1 inserted through the insertion port 12 is conveyed by the running of the support conveyor belt 4, and during this conveyance, it is charged by the charger 7 to a polarity opposite to that of the color developer 2, and the color developer It is transported to the transfer area 9. Here, an electric field suitable for the polarity of the charged color developer 2 is applied to the support conveyance roller 3 by a power source E.
1, the color developer 2 is electrostatically adsorbed from the color developer conveying roller 5 to the support 1 and adhered thereto.

The support 1 with this color developer 2 attached to its surface is
It is brought into close contact with the exposed microcapsule paper 15 and pressure development is performed.

At this time, since the support 1 has been charged in advance by the charger 7 to a polarity opposite to that of the color developer 2, the color developer 2 is held on the support 1 with sufficient adhesive force and transported. There is no risk that the microcapsule paper 15 will fall off during transportation of the support body 1 or be peeled off during pressure contact with the microcapsule paper 15. Therefore, in the pressure development process, a good image without missing pixels can be obtained.

The developed support 1 is then discharged from the outlet 13 as an image recording medium.

It should be noted that the present invention is not limited to the embodiments described in detail above, and it goes without saying that changes can be made within the scope of the invention.

〔Effect of the invention〕

As is clear from the detailed description above, according to the present invention, there is provided a developer charging application section that charges a developer and electrostatically applies the charged developer to a support by suction; A charger is disposed upstream of this color developer charging application section and is equipped with a charger that charges the support in advance to a polarity opposite to that of the color developer, so that the transfer efficiency of the color developer to the support is improved. As a result, a large amount of color developer can be attached to the support in the transfer area. Also,
After adhesion of the color developer, reliably prevents the color developer from falling off the support during subsequent transportation or from adhering to the microcapsule paper during pressure development. be able to.

Therefore, it is possible to obtain a clear image without missing pixels.

[Brief explanation of the drawing]

The figure is a cross-sectional view showing a schematic configuration of a copying machine equipped with an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Support body, 2... Color developer, 3... Support conveyance roller, 5... Color developer conveyance roller, 6... Color developer supply roller, 7... Charger , 9... developer transfer area,
10°23...Power supply, 15...Microcapsule paper.

Claims (1)

[Scope of Claims] A color developer application device that creates an image forming medium by depositing a color developer on the surface of a support, comprising: charging the color developer and applying the charged color developer to the support. a charging section for applying a color developer by electrostatic suction; and a charging section disposed upstream of the charging section for applying a color developer and charging the support in advance to a polarity opposite to that of the developer. A color developer coating device characterized by comprising a container.