KR100297756B1 - Device for squeezing carrier of wet printer - Google Patents

Abstract

PURPOSE: A device for squeezing a carrier in a wet printer is provided to minimize a size by reducing component and to conveniently release liquid carrier by pressurizing or absorbing. CONSTITUTION: A carrier squeezing device of a wet printer comprises a shaft member(40) rotationally mounted on a body; an absorbing roller(30) rotationally installed on the shaft member; an absorbing member(32) contacting to a photo receptor(10); a supporting shell(34) supporting the absorbing member; a withdraw hole(34a) withdrawing carrier absorbed into the supporting shell; a transfer face having a toner; a power(90) maintaining specific potential of the supporting shell; a shaft supporter(70) installed on the body; a fixing ring(60) controlling movement of the shaft toward a width direction of the photo receptor; and a ring groove(42) combined to the fixing ring. Thereby, the carrier-squeezing device of the wet printer minimizes size by reducing components.

Description

Carrier squeegeeing device of wet press

The present invention relates to a carrier squeegeeing apparatus for wet presses, and more particularly, to a carrier squeezing apparatus for wet presses having an improved structure of a squeeze roller.

Generally, a wet printer is provided with a developer for developing a desired image on a photosensitive medium such as a photosensitive belt by using a developer in which a solid toner having a predetermined color and a liquid carrier serving as a solvent are mixed.

As shown in FIG. 1, the developing device transfers the developing solution I supplied through the injection nozzle 11 to the transfer surface 10a of the photosensitive belt 10 while being installed and rotated inside the developing body main body 20. Carrier for film-forming the toner T in the developing roller 12 and the developing solution I transferred to the said transfer surface 10a, and separating the liquid carrier C other than the filmed toner T. A squeezing device is provided.

The carrier squeezing device includes a primary squeeze roller 13 and a secondary squeeze roller 14 installed to be in contact rotation with the photosensitive belt 10. The primary squeeze roller 13 is in contact with the photosensitive belt 10 and driven rotationally in the traveling direction of the photosensitive belt 10 by the frictional force, compressing the transfer surface (10a) to the transfer surface (10a) The toner T is formed into a film from the attached developer (I). The carrier C other than the filmed toner T is separated from the transfer surface 10a by the primary squeeze roller 13 and flows down, and is then collected by the blade 15 into the developer main body 20. .

On the other hand, as the primary squeeze roller 13 rotates in the same direction as the traveling direction of the photosensitive belt 10, the developing solution of the pressing portion A of the transfer surface 10a squeezed by the primary squeeze roller 13 A wrap-around phenomenon occurs in which I) passes over both ends of the primary squeeze roller 13 and continues to remain on the transfer surface 10a.

In order to prevent the wrap-around phenomenon, the primary squeeze roller 13 may be rotated in a direction opposite to the traveling direction of the photosensitive belt 10 by a separate driving means. In this case, the primary squeeze roller 13 is The toner T to be filmed on the photosensitive belt 10 is scraped off, and the transfer surface 10a of the photosensitive belt 10 is damaged, resulting in poor print quality.

The secondary squeeze roller 14 is rotated in the reverse direction of the traveling direction of the photosensitive belt 10, and finally the photosensitive solution passing through both ends of the primary squeeze roller 13 without being separated from the photosensitive belt 10 It is separated from the belt 10.

By the way, the conventional squeegee device for wet presses having the above configuration is provided with a secondary squeeze roller 14 in addition to the primary squeeze roller 13 to increase the number of parts and the installation space, which makes the structure complicated. And the size of the printing press becomes large.

In addition, when the secondary squeeze roller 14 contacts and rotates the transfer surface 10a of the photosensitive belt 10, the width of the photosensitive belt 10 is made large to prevent damage to the transfer surface 10a. Since it must be installed, there is a problem that the size of the printing press becomes larger.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a carrier squeegee device for a wet printing machine having an improved structure to separate a liquid carrier by pressurization and suction.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic configuration diagram of a developer in which a carrier squeegee device for a conventional wet printer is employed.

Figure 2 is a schematic diagram of a developing device employing a carrier squeegee device for a wet printing machine according to an embodiment of the present invention.

3 is a schematic perspective view of the carrier squeezing device shown in FIG.

<Description of Symbols for Major Parts of Drawings>

10. Photosensitive belt 12. Development roller

20. Developing body 30. Suction roller

32. Suction member 34. Support shell

40. Shaft member 42. Ring groove

44. Impeller 50. Rotating bearing

60 .. retaining ring 70. bearing

80. Driving part 82. Driving belt

84. Gear 90. Power

100 .. Carrier Squeegee

Carrier squeezing device for a wet printer according to the present invention for achieving the above object, in the carrier squeegee device for wet printer for removing the liquid carrier from the developer attached to the photosensitive medium of the wet printer, rotational drive to the frame A shaft member that is installed to be capable of being installed and has an impeller portion continuously protruding in a spiral shape on a portion of an outer circumferential surface thereof; A suction roller having a plurality of micropores in contact with the photosensitive medium and sucking the carrier in the liquid phase, the suction roller being rotatably installed on an outer circumferential surface of the shaft member; It includes a drive unit for rotating the shaft member, characterized in that the liquid carrier is forced to be sucked into the suction roller during the rotation of the shaft member.

Here, the suction roller and the suction member in contact with the photosensitive medium; The suction member is supported on the outer circumferential surface, a plurality of extraction holes are formed so that the carrier sucked into the suction member is extracted to the outside, and preferably includes a support shell rotatably installed on the outer circumferential surface of the shaft member.

Hereinafter, a carrier squeegeeing apparatus for a wet printer according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view showing a developing device employing a carrier squeezing device according to an embodiment of the present invention.

Here, the same reference numerals as the reference numerals of the drawings shown above indicate the same components.

Referring to the drawings, the carrier squeezing device 100 includes a shaft member 40 rotatably installed in the developer body 20 and a suction roller 30 rotatably installed in the shaft member 40. It is configured by.

As shown in FIG. 3, the suction roller 30 has a suction member 32 in contact with the photosensitive belt 10, and a support shell 34 supporting the suction member 32. The suction member 32 has a plurality of micropores such as, for example, a sponge, through which the carrier C on the photosensitive belt 10 is sucked. Then, the suction member 32 is in close contact with the photosensitive belt 10 and driven by the friction force. The suction member 32 is preferably formed of a rubber material having a high friction force. The support shell 34 is always the suction member 32 is coupled to the outer peripheral surface, it is supported by the shaft member (40). Since the rotating bearing 50 is placed between the support shell 34 and the shaft member 40, each of the support shell 34 and the shaft member 40 may be independently moved. Thus, the support shell 34 and the suction member 32 are free to rotate without being constrained by the rotation of the shaft member 40. The support shell 34 is formed with a plurality of micropores through which the carrier sucked by the suction member 32 passes. In addition, the support shell 34 is formed with an extraction hole 34a through which the carrier member sucked into the support shell 34 through the suction member 32 is extracted to the outside. In this embodiment, the extraction hole 34a is formed to open to one side of the support shell 34. The support shell 34 is formed of a metal material having high strength and conductivity. Here, the suction member 32 and the support shell 34 may be integrally formed.

On the other hand, it is preferable that the power supply 90 is provided so that the support shell 34 formed of the metal material maintains a predetermined potential. By keeping the support shell 34 at a predetermined potential state, it is possible to prevent the toner T from being pulled out of the photosensitive belt 10. That is, since the toner T on the transfer surface 10a usually has a positive electrode, the toner T is separated from the transfer surface 10a by maintaining the potential of the positive electrode in the support shell 34. Is prevented.

The shaft member 40 is installed on the outer circumferential surface of the support shell 34, it is rotatably installed on the bearing 70 is installed in the developer main body 20. And the shaft member 40 is rotated by the drive unit 80 is driven by a predetermined drive source. On the outer circumferential surface 40a facing the support shell 34 of the shaft member 40, an impeller portion 44 protruding in a spiral shape with respect to the outer circumferential surface 40a is formed. The impeller 44 is rotated in the space within the support shell 34 to generate a suction force for forcibly sucking the carrier C into the support shell 34 through the suction member 32, and the sucked carrier is extracted. Move toward the ball 34a to be extracted to the outside. The shaft member 40 is formed with a ring groove 42 to which the fixing ring 60 is fastened to restrain the support shell 34 from being moved in the width direction of the photosensitive belt 10.

The driving unit 80 includes a gear 84 installed at one end of the shaft member 40 and a driving belt 82 geared to the gear 84 to travel. The drive belt 82 is driven by a drive source not shown in the figure, thereby rotating the gear 84. In the case where a plurality of developing devices are employed in the printing press, the driving belt 82 makes it possible to simultaneously drive the respective shaft members provided in each developing unit. In addition, it is also possible to directly drive a drive source such as a motor to the shaft member 40 to rotate the drive.

The operation of the carrier squeezing device 100 according to the embodiment of the present invention having the configuration as described above will be described.

As the photosensitive belt 10 travels, a developer injected into the shape gap between the transfer surface 10a and the developing roller 12 from the injection nozzle 11 is attached to the transfer surface 10a. The developer attached to the transfer surface 10a is pressed by the suction layer 32 which is in contact with the photosensitive belt 10 and driven rotationally in the direction of the arrow C by the frictional force thereof. At this time, the shaft member 40 is driven at a high speed in the opposite direction to the rotation direction of the suction layer 32 by the drive unit 80 independently of the rotation of the suction member 32 and the support shell 34. By the suction force generated by the high speed rotation of the shaft member 40, the carrier C of the transfer surface 10a is sucked into the suction member 32, and the toner T other than the sucked carrier C is made of a film. Become On the other hand, the carrier sucked into the support shell 34 through the suction member 32 is extracted to the outside through the extraction hole (34a) is dropped into the developer body 20 is recovered. Thus, by absorbing and removing the carrier of the transfer surface (10a) by using the suction member 32 that is in contact with the photosensitive belt 10 to be driven rotation, the wrap around phenomenon as in the prior art does not occur. Therefore, the secondary squeeze roller becomes unnecessary, and the width of the photosensitive belt 10 can be reduced, so that the printer can be downsized. In addition, it is possible to suppress the formation of the drip line by the developer remaining over the outer circumferential surface of the conventional primary squeeze roller 13 (see FIG. 1) and the transfer surface 10a after the printing operation. Therefore, the driving operation for rotating the primary squeeze roller 13 in the direction opposite to the traveling direction of the photosensitive belt 10 is unnecessary for removing the drip line, and thus, the friction of the primary squeeze roller 13 during rotation is eliminated. Damage to the photosensitive belt 10 transfer surface 10a can be reduced.

Although the present invention has been described with reference to the accompanying drawings only for a limited embodiment, it should be understood that those skilled in the art may have other modifications within the scope of the present invention described below.

According to the carrier squeegeeing apparatus for wet printing machines of the present invention as described above, the carrier squeezing efficiency is improved by forcibly sucking and removing the carrier on the transfer surface by the suction force by the shaft member.

In addition, since it is possible to suppress the wrap around phenomenon and the formation of the drip line, damage to the photosensitive belt transfer surface can be minimized.

In addition, by using one squeegeeing device having a suction member, the number of parts can be reduced and the printer can be downsized.

Claims (3)

A carrier squeegeeing apparatus for a wet press for removing a liquid carrier from a developer attached to a photosensitive medium of a wet press, A shaft member rotatably installed on the frame, the shaft member having an impeller portion continuously protruding spirally in a portion of an outer circumferential surface thereof; A suction roller having a plurality of micropores in contact with the photosensitive medium and sucking the carrier in the liquid phase, the suction roller being rotatably installed on an outer circumferential surface of the shaft member; And a driving unit for rotating the shaft member, wherein the carrier of the liquid is forced into the suction roller when the shaft member is rotated. The method of claim 1, wherein the suction roller, A suction member in contact with the photosensitive medium; The suction member is supported on the outer circumferential surface, and a plurality of extraction holes are formed to be extracted to the outside through the carrier sucked into the suction member, characterized in that it comprises a support shell rotatably installed on the outer peripheral surface of the shaft member Carrier squeegeeing device for printing presses. The method of claim 2, Carrier squeegee device for a wet printer, characterized in that the support shell further comprises a power source to maintain a predetermined potential.