JPH0756581B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention forms, for example, a television image to form an electrostatic latent image on a recording medium, and then wet develops the electrostatic latent image to display the image on the recording medium. Recording device.

[Outline of Invention]

According to the present invention, an electrostatic latent image is formed on a uniformly charged recording medium by a light beam whose brightness (density) is modulated corresponding to an image signal, and the electrostatic latent image is developed by wet development. A heater for evaporating the developing solution remaining on the body is provided so that the residual developing solution does not contaminate the recording body itself or the exposure device with a light beam. .

[Conventional technology]

A negative electric charge is uniformly charged to the recording medium, and a light beam such as a laser beam whose density is modulated corresponding to the image of the television signal is horizontally and vertically scanned to form an electrostatic latent image. There is already known a recording apparatus which is formed in advance, and then wet-developed to disperse the positively charged toner in the developer in accordance with the latent image amount.

[Problems to be solved by the invention]

In such an apparatus, since the so-called wet development method is adopted, some developer remains in the form of water droplets due to so-called surface tension with respect to the recording material even after the completion of development, and this causes the recording material to remain. However, there is a problem in that it contaminates an exposure apparatus or the like with a light beam.

[Means for solving problems]

The present invention solves such a problem and provides a recording apparatus adopting the wet developing method as described above, which is provided with a heater for heating the recording medium from the back surface thereof in a development completed state.

[Action]

When the heater is energized in the state where the development of the recording material is completed, the recording material is heated, and thus the developing solution remaining on the recording material is evaporated.

〔Example〕

An example of the recording apparatus according to the present invention will be described below with reference to FIGS. 1 and 2, in which (1) is a developing tank, and a developing solution (2) is contained therein. The developer (2) is a liquid in which an electrically charged toner is dispersed in an insulating liquid, and the toner is composed of a pigment and an adhesive applied around the pigment. In order to obtain a color image, the above-mentioned toner is composed of three colors of yellow, magenta and cyan, so that the developing tank (1) also
It is provided for each of these toners.

A liquid tank (3) is further attached to the inside of the developing tank (1) by a leg (4), and a window hole (5) formed in a part of the bottom surface thereof.
A pump (6) (blade in the figure) is arranged in the printer, and the developer (2) in the developing tank (1) is rotated by a driving means (7) such as a motor, so that the window ( It is adapted to be fed into the liquid tank (3) through 5). The liquid tank (3) is provided with a rectifying plate (9) having a large number of small holes (8) aligned, and a slit (10) is provided at the upper opening of the liquid tank (3). An electrode plate (11) having is attached. The developing machine (13) is configured in this manner.

Further, stoppers (12a) for positioning with respect to a guide (18) described later are provided at the upper ends of the walls (1a) and (1b) arranged at both ends of the developing tank (1) in the longitudinal direction.
And (12b) are formed.

On the other hand, a plate body (16) rotatable about the shaft (15) is provided, and a guide (18) made of ceramic is attached to the plate body (16) via a spring (17). The guide (18) is elongated as a whole and is formed in a rod shape, and a part of the cross section has a part such as a cylindrical surface or an elliptical surface, which serves as a guide surface (18a). A heater (19) is housed in the guide (18) so that the guide surface (18a) of the guide (18) can be instantaneously heated to about 150 to 200 ° C in a predetermined process. ing.

When the plate body (16) is tilted as shown by the solid line in FIG. 1, its tip end abuts against the stopper (20), and in this state, the guide (18) is moved by the spring (17) as shown in FIG. It is pressed against the stoppers (12a) and (12b) as shown in FIG. In this case, the upper surfaces (contact surfaces with the guide (18)) of the stoppers (12a) and (12b) are formed so as to correspond to the guide surface (18a) of the guide (18). The cage (18) has a pair of stoppers (12
The guide surface (18a) is arranged so as to face the upper surface of the electrode plate (11) at a constant distance in a state of being received by a) and (12b). In this case, the distance between the two (11) and (18) is selected to be about 0.5 mm, for example. Therefore, the upper surface of the electrode plate (11) also has the guide (18).
The curved surface is formed so as to face the guide surface (18a).

Further, (21) is a charger, which allows recording paper (22)
The lower surface of the recording medium is uniformly charged to minus (-), and then a light beam (23) such as a laser beam is irradiated onto the recording paper (22). This laser beam (23)
Is, for example, density (luminance) modulated according to a video signal (luminance signal) of a television signal, and is configured to scan the recording paper (22) in correspondence with horizontal synchronization of the television signal. . The scanning direction in this case is the recording paper (22)
Is a direction perpendicular to the transfer direction (arrow direction in FIG. 1), that is, the direction perpendicular to the paper surface of FIG. The vertical scanning is performed by moving the recording paper (22) in the direction of the arrow (paper feed).

(24) is a drive roller for feeding paper, and (25) is a pinch roller, and these both constitute a paper feeding device (26) in the arrow direction. Further, (27) and (28) are brake rollers, respectively, which form a braking device (29) for the recording paper (22).
The recording paper (22) is transferred between 6) and (29) without slack. (30) is a static eliminator.

Next, the above-mentioned operation will be described with reference to FIGS. 3 to 5. First, as shown in FIG. 3, that is, as shown by the alternate long and short dash line in FIG. The recording paper (22) is fed between the paper feed device (26) and the brake device (29) while the (16) is lifted up, and the paper feed is stopped, and then the plate body (16) is moved to the first position. Rotate to the solid line in the figure. At this time, the guide (18) contacts the pair of stoppers (12a) and (12b) as shown in FIG. 2, and the recording paper (22) is mounted on its guide surface (18a) as shown in FIG. Guidance is provided in a state where the stretched surface is in close contact. Therefore, the recording paper (22) is opposed to the electrode plate (11) at a constant interval.

In this state, the paper is fed, the recording paper (22) is uniformly charged by the charging device (21) as described above, and writing is performed by the laser beam (23), that is, discharge according to the luminance signal is performed to form a latent image. Are formed and transferred onto the developing machine (13).

At this time, in the developing machine (13), the motor (7) drives the pump (6) to cause the developing solution (2) to overflow onto the electrode plate (11) through the slit (10) of the electrode plate (11). FIG. 4 shows this state. As a result, the developer (2) enters between the guide (18) and the electrode plate (11) and comes into contact with the recording paper (22), so that the toner of the developer (2) adheres to the recording paper (22). On the other hand, it is attached according to the amount of electrification and becomes a light and dark pattern. In this way, the liquid returns to the original developing tank (1) again. The recording paper (22) developed by the developing machine (13) is neutralized by the static eliminator (30).

After the development is completed in this way, the rotation of the motor (7) is stopped, that is, the driving of the pump (6) is stopped, and thus the supply of the developing solution (2) to the electrode plate (11) is stopped. It
FIG. 5 shows this state. In this case, the developing solution remains between the recording paper (22) and the electrode plate (11) due to the surface tension. Therefore, after driving the pump (6) described above, the heater (19) is energized within a very short time of about 1 to 3 seconds, whereby the guide surface (18a) of the guide (18) is turned on. It is instantaneously heated to about 150 ° C. to 200 ° C., so that the remaining developer is evaporated almost instantaneously due to the surface tension (see FIG. 6).

After that, lift the guide (18) again to return it to the original state.

When a color image is obtained, the above-described operation is repeated three times for each of yellow, magenta and cyan colors. Of course, the color of the toner in the developer can be changed accordingly, but generally, the entire developing machine (13) is converted.

In addition, the electrode plate (11) is used while being grounded or slightly negatively applied, so that the electrode plate (11) and the recording paper (22) facing it are evenly distributed. An electric field is created which avoids the edge effects in so-called electrophotography.

Incidentally, although the means for electrostatic latent image is also shown in this example, this means may be provided separately and the means of the present invention may be simply means for wet development.

FIG. 7 shows another embodiment of the apparatus according to the present invention. In this embodiment, a recording paper is wound around a drum for exposure and development, which will be briefly described below. However, in the present example, portions corresponding to those in FIG. 1 and FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

That is, in this example, the drum (33) that rotates in the direction of the arrow around the rotation shaft (32) is provided, and the recording paper (22) described above is wound around the drum (33). (34a) and (3
4b) is a chuck for fixing the front end and the rear end of the recording paper (22) in the rotating direction. Further, (35) is an air knife head, by which hot air is blown out.

Even in an apparatus using such a drum (33), a heater (in the vicinity of the rear end of the recording paper (22), that is, immediately before the chuck (34b) on the rear end side, is provided in the drum (33). 19) to store this heater (1) for recording paper (22).
When the development of the part corresponding to 9) is completed, it is heated instantaneously as described above, so that the developer remaining near the trailing edge of the recording paper (22) is evaporated almost instantaneously. Is something that can be done.

〔The invention's effect〕

According to the present invention described above, by energizing the heater after the completion of development, the developer remaining on the recording paper can be instantaneously heated to evaporate it, and thus the residual liquid remains as in the conventional case. It has a feature that it is possible to surely prevent the recording paper from being contaminated by the developing solution or from being contaminated with other devices.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a recording apparatus according to the present invention, FIG. 2 is a schematic front view thereof, and FIGS. 3 to 6 are schematic side views for explaining the operating state thereof. 7 and 8 are schematic side views showing another embodiment of the device according to the present invention. (2) is a developing solution, (11) is an electrode plate, (13) is a developing machine,
(18) is a guide, (19) is a heater, (26) is a feeder,
(29) is a brake device.

Claims (1)

[Claims] 1. A charging means for uniformly charging a recording material, an exposing means for forming an electrostatic latent image on the charged recording material, and a wet development of the electrostatic latent image-forming recording material using a developing solution. In the recording apparatus including a developing device, the recording body is brought close to the developing machine at a position facing the developing machine, and a guide for stretching and guiding the recording body; A recording apparatus comprising: a heater that heats a body from the back surface thereof to evaporate the developing solution remaining on the recording body.