JPS5934902Y2 - Surplus developer recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surplus developer recovery device in which an air knife squeeze device is disposed after the developer application section of a liquid developing device.

Most of the liquid that adheres to the surface of the photosensitive paper film at the developer application area is surplus liquid, and must be removed in order to improve image quality.

It is well known to use air knife squeeze devices or blades to remove this excess liquid.

Bringing the blade into contact with the surface of the photosensitive paper film is very effective in removing excess liquid, but in this case the image is disturbed.

At the end of development, the liquid supply to the developer application area is stopped and the head is lowered, but at this time, droplets line up on the surface of the photosensitive paper, which causes a trail of dirt in the transfer area, which adversely affects copy quality. give.

The present invention aims to eliminate the above-mentioned drawbacks in the surplus developer recovery device of the conventional liquid developing device.

The invention will now be described with reference to embodiments illustrated in the accompanying drawings.

In FIG. 1, a photosensitive paper 1 is guided along a guide plate 7,
Below the photosensitive paper path, a developer application section 2, a blade 3, and an air squeeze device 4 are arranged in this order in the photosensitive paper transport direction indicated by .

As shown in FIG. 3, the blade 3 has side plates 8a and 8b.
The blade support 5 is attached to a blade support 5 which is pivotally supported by a rotary solenoid 9 and rotated by a rotary solenoid 9.

The tip of the blade 3 is at approximately 0.0
．． They are placed opposite each other with a slight gap of 1-0.3mm,
At the end of development, the rotary solenoid 9 is activated to rotate the blade support 5, so that the tip of the blade 3 is brought into contact with the film surface of the photosensitive paper.

This state of contact is shown in FIG.

Conveniently, the blade is made of polyester sheet.

In FIG. 4, a line X indicating on/off of developer supply,
A line Z indicating on/off of the supply of air from the air squeeze device 4 is turned on at time A, and supply of developer from the developer application section 2 and supply of air from the air squeeze device 4 are started.

In FIG. 1, the photosensitive paper 1 coated with a developer in the developer coating section 2 is conveyed in the conveyance direction (2).

At this time, the position of the tip of the blade 3 has a slight gap of about 0.1 to 0.3 mm with respect to the image surface of the photosensitive paper 1, as described above.

Most of the developer that adheres to the image surface of the photosensitive paper 1 in the developer application section 2 is surplus liquid, and when the photosensitive paper 1 passes the tip of the blade 3, this surplus liquid is and will be continuously recovered through the construction work flow.

Immediately after the image area of the photosensitive paper 1 has passed through the developer application section 2, at time B in FIG. 4, the line , it goes down as shown in Figure 2.

After a short time, at time C, a line Y indicating on/off of rotation of the rotary solenoid 9 turns on, and the tip of the blade 3 contacts the rear end of the photosensitive paper 1 for a short time.

In FIG. 2, the rear wheel of the photosensitive paper 1 is dotted with developer puddles 6 when the head of the developer application section is lowered.

The tip of the blade 3 scrapes off this unnecessary liquid pool 6.

At the time when the trailing edge of the photosensitive paper 1 finishes passing through the blade 3, line Y in FIG. 4 is turned off, the rotary solenoid returns to its original position, and the tip of the blade 3 descends.

Furthermore, at time E when the rear end of the photosensitive paper 1 finishes passing through the air squeeze device 4, the line Z is turned off and the air squeeze device 4
air supply stops.

As explained above, according to this invention, the tip of the blade 3 is positioned with a slight gap from the photosensitive paper 1, and in cooperation with the air squeeze device 4, excess liquid is collected over the entire photosensitive paper, and then the photosensitive paper 1 is exposed. The blade 3 contacts the photosensitive paper 1 and scrapes off the developer that adheres to the rear edge of the paper 1 in the form of water droplets, so that the liquid puddles do not tail off at the rear edge of the photosensitive paper 1 without disturbing the image. It does not cause any contamination.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the liquid developing device according to the present invention while the developer is being supplied, FIG. 2 is an explanatory diagram of the liquid developing device when the developer supply has finished, and FIG. 3 is a perspective view of the blade and its drive unit. ,
FIG. 4 is a graph showing on/off of operation, and the horizontal axis shows time. 1...Photosensitive paper, 2...Developer application part,
3...Blade, 4...Air squeeze device.

Claims (1)

[Scope of utility model registration request] In a surplus developer recovery device in which an air knife squeeze device is disposed after the developer application section of the liquid developing device, a sheet-shaped blade is disposed between the developer application section and the squeeze device, and this blade is disposed between the developer application section and the squeeze device. The blade is held so that its tip faces the developing surface of the photoreceptor with a slight gap, and means is provided for moving the blade so that its tip touches the rear end of the photoreceptor when development is completed. Featured device.