JPS587387Y2 - Prewetting device for transfer sheets in wet color electronic copying machines - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a device for pre-wetting an insulating liquid to a transfer sheet wound around a rotating body before transfer, in a wet color electronic copying machine. is 1
When the cycle process is finished and pre-wetting is no longer necessary, in order to prevent the insulating liquid remaining at the rear end of the transfer sheet from dripping onto the transfer sheet of the transfer layer and staining the transfer sheet screen. be.

Conventionally, as shown in FIG. 1, for example, an outflow pipe 3 is disposed close to a transfer sheet 2 wound around a rotating body 1 and an insulating liquid such as isopar is disposed therethrough, and a receiving plate 4 is placed below the transfer sheet 2. 1
A sponge roller 5 is disposed at the bottom of the tip of the sponge roller 5, which is brought into contact with the transfer sheet 2 to apply insulating liquid to the rotating transfer sheet 2, and when one cycle process is completed, the sponge roller 5 rotates when one cycle process is completed. Although the insulating liquid was stopped from flowing out from the outflow tube 3 and the sponge roller 5 was moved away from the transfer sheet 2, the remaining liquid on the sheet caused dripping and the transfer layer dripped onto the surface of the transfer sheet 2. There was a drawback that the image ran and the screen of the transfer sheet 2 was stained.

In this invention, when one cycle process is completed, the applicator roller is released from the transfer sheet, and at the same time, the absorption roller is brought into contact with both ends of the transfer sheet wound around a rotating body and the rotating body between both ends, so that the application roller drips from the transfer sheet. It absorbs flowing insulating liquid and eliminates the drawbacks of the conventional method.

Next, an embodiment of the present invention shown in FIGS. 2 to 1 of the accompanying drawings will be described in detail.

Reference numeral 10 denotes a photoreceptor belt having a photoconductive layer on its surface. The photoreceptor belt 10 is charged by a charger 11, moves on a document table 12, and is exposed to light by an optical system 13, so that a developer in a developer storage tank 14 is released. The pump 15 supplies the developing container 16, and the roller 1
At step 7, a developer is applied to the photoreceptor belt 10 to form a color toner image 18.

Reference numeral 19 denotes a rotating body on which the transfer sheet 20 is wound.

21 is a charger for the transfer sheet, 22 is a corona discharger for separation, and 23 is a cleaning member.

Since the length of the transfer sheet 20 is shorter than the outer circumferential length of the rotary body 19, an exposed portion 19a of the rotary body 19 is formed between both ends of the transfer sheet 20.

A is the pre-wetting device of the present invention, which has many small holes 30 on the surface.
A sponge applicator roller 31 is fitted around the outer periphery of the outflow pipe 30 in which holes 32a are bored, and a sponge absorption roller 3 is fitted around the outer periphery of the absorption pipe 32, which also has many small holes 32a in its surface.
3 and connect both ends of the outflow pipe 30 and absorption pipe 32 with the connecting rod 34.
．． 35, and shafts 36 and 37 fixed in the middle are rotatably connected to frames 38 and 39 on both sides of the rotating body 1, and an insulating liquid supply pipe 40 such as isopar is connected to one end of the outflow pipe 30. An insulating liquid absorption pipe 41 is connected to one end of the absorption tube 32, and continuous rods 34, 35 are constantly pulled by springs 42, 43, and an absorption roller 33 fitted around the outer periphery of the absorption tube 32 is applied to the transfer sheet 20. A well-known electromagnetic rotating member 44 is connected to one rotating shaft 36, and the electromagnetic rotating member 4 is connected in accordance with a sequence.
4 is activated, the application roller 31 comes into contact with the transfer sheet 20, and the absorption roller 33 separates from the transfer sheet 20.

Next, the effect will be explained.

When performing color electronic copying, color toner images 18 of yellow, magenta, cyan, black, etc. are sequentially formed on the photoreceptor belt 10 and transferred in close contact onto the transfer sheet 20 one after another.

In that case, when transferring each color, the transfer sheet 20 is charged in advance by the transfer sheet charger 21 according to the sequence, and the rotating body 19 is rotated with the application roller 31 of the outflow pipe 30 in contact with the tip 20a of the transfer sheet 20. .

The charged transfer sheet 20 has a film of an insulating liquid such as isopar formed on the front end 20a and the other surface thereof, and is brought into close contact with the color toner image 18 on the photoreceptor belt 10.

At this time, the color toner image 18 is transferred to the transfer sheet 20 by electrophoresis in the insulating liquid film.

The transfer sheet 20 is separated from the photoreceptor belt 10 by corona discharge from a separating corona discharger 22.

The photoreceptor belt 10 is cleaned by the cleaning member 23, one cycle process is completed, and the coating roller 31 from which the insulating liquid has flowed out of the surface transfers the transfer sheet 20.
When the position is slightly in front of the rear end 20b, the electromagnetic rotating member 44 is released according to the sequence, the shafts 36 and 37 are rotated, the application roller 31 is released from the transfer sheet 20, and the absorption roller 33 is moved to the rear end 20b at the same time. Nearby and rotating body 1
9 and absorbs the insulating liquid dripping from the rear end 20b of the transferred transfer sheet 20, thereby preventing the insulating liquid from dripping onto the transferred transfer sheet 20.

Similarly, when the transfer of the three or four color toner images 18 is completed, the transfer sheet 20 is separated from the rotating body 19 and transported to a predetermined position.

According to the present invention, when performing wet color electronic copying, when one cycle process is completed for each color such as yellow, magenta, cyan, black, etc., the insulating liquid that drips from the rear end of the transfer sheet is absorbed by the absorption roller, so the transfer is performed. It is possible to reliably prevent the insulating liquid from dripping onto the finished transfer sheet and staining the transfer sheet screen.

The application roller and absorption roller may be made of any material as long as it is capable of applying or absorbing an insulating liquid such as isopar, or they may be connected by a continuous rod and oscillate as in the above embodiment. Instead of rotating, the transfer sheet and the rotating body may be brought into contact with and separated from each other separately.

[Brief explanation of the drawing]

FIG. 1 is a partial front view of the main parts of a conventional pre-wet device, FIG. 2 is an explanatory front view of a wet color electronic copying machine incorporating an embodiment of the present invention, and FIG. 3 is a front view of the present invention of FIG. FIG. 4 is an enlarged side view of the main part of FIG. 3, FIG. 5 is a perspective view of the outflow pipe of the device of the present invention, and FIG. 6 is a perspective view of the absorption tube of the device of the present invention. . 19... Rotating body, 19a... Rotating body exposed part, 20.
... Transfer sheet, 20a... Transfer sheet starting end, 20b
... Transfer sheet rear end, 31 ... Application roller, 33
...Absorption roller.

Claims (1)

[Scope of utility model registration request] A photoreceptor having a photoconductive layer on its surface is charged and exposed to light, a color toner image is formed with a developer, a transfer sheet is wound around a rotating body, the transfer sheet is charged and pre-wet before transfer, and the color toner is In a wet-type color electronic copying machine designed to closely transfer images, an application roller that applies an insulating liquid to the surface and an absorption roller that absorbs the insulating liquid from the surface are used to transfer images to the surface of the transfer sheet and the wound transfer roller. A pre-wetting device for a transfer sheet, which is capable of selectively contacting the surface of a rotating body on both end faces of the sheet.