KR20000006670U - Dry unit of wet electrophotographic printer - Google Patents

Abstract

Disclosed is a dry unit of a wet electrophotographic printer.

The disclosed dry unit includes a lower assembly including a main bracket installed on a frame so as to be detachable from a photosensitive medium and absorbing a liquid solvent remaining in the photosensitive belt, the main roller being movably mounted to the frame; And a heating roller for heating the dry roller is installed to be movable relative to the frame. The auxiliary roller is coupled with the main bracket to move relative to the frame with the main bracket, and the heating roller is dried while supporting the heating roller. And an upper assembly including a third bracket installed to be movable relative to the auxiliary bracket so as to contact / separate the roller. Therefore, since the assembly of the unit is completed by installing the lower assembly on the frame first and then installing the upper assembly on the lower assembly, there is an advantage of reducing the assembly labor.

Description

Dry Unit of Wet Electrophotographic Printing Machine

The present invention relates to a dry unit for drying and removing a liquid solvent remaining on a photosensitive medium in a wet electrophotographic printer, and more particularly, to a dry unit of a wet electrophotographic printer having an improved assembly structure of a dry unit. .

In general, a wet electrophotographic printing machine such as a color laser printer develops a predetermined image by developing a developer in which a liquid solvent and a powdered toner are mixed on a photosensitive medium 10 such as a photosensitive belt. The developing unit 20, the dry unit 30 for drying and removing the liquid solvent remaining in the photosensitive medium 10 after development, and the image developed on the photosensitive medium 10 on the paper S A transfer unit 40 for transferring is provided.

The dry unit 30 is a dry roller 31 for adsorbing a liquid solvent in the developing solution while being in close contact with the photosensitive medium 10 and rotating it in contact with the dry roller 31 so as to be heated on the surface thereof. And a heating roller 32 for evaporating the absorbed solvent. On the other hand, the solvent evaporated by the heating roller 32 is recovered through a predetermined route.

By the way, while the photosensitive medium 10, the dry roller 31 and the heating roller 32 are driven in close contact with each other as shown in the figure while printing is in progress, the solvent absorbs and evaporates, but does not print for a long time. In this case, the photosensitive medium 10, the dry roller 31 and the heating roller 32 need to be spaced apart from each other. Since the surface temperature of the heating roller 32 is about 90 ° C. during printing, only the localized portion of the surface receives heat and is thermally deformed while the dry roller 31 is not rotated by the heating roller 32. To prevent this.

In addition, in the printing standby mode to start printing soon, the dry roller 31 is rotated while being in close contact with the heating roller 32 while being spaced apart from the photosensitive medium 10 to maintain the surface temperature of about 75 ° C. There is. This is because it is effective to reduce the time required for warming up by preheating the dry roller 31 to the above temperature before starting printing. At this time, since the dry roller 31 is not driven in contact with the photosensitive medium 10, it must be rotated by a separate driving means.

In view of the foregoing, the present applicant has provided a dry unit capable of changing a relative position between the dry roller 31 and the heating roller 32 according to the print mode, the print standby mode, and the stop mode through Korean Patent Application No. 98-15524. It was initiated. However, such a dry unit is cumbersome because the assembly parts such as the dry roller 31 and the heating roller 32 bracket (not shown) must be assembled in a certain order or in a frame having a limited space, and thus the assembly process is cumbersome. There is a problem that the assembly tolerance may occur.

The present invention was devised to solve the above problems, and the lower assembly supporting the dry roller is manufactured in a separate form, and the upper assembly supporting the heating roller is manufactured in another form, so that the two assemblies are separated from each other. It is an object of the present invention to provide a dry unit of a wet electronic test printing machine having an improved structure such that each assembly is assembled to a lower assembly to a frame and then the upper assembly is mounted to the lower assembly to complete one complete assembly.

1 is a configuration diagram schematically showing the structure of main parts of a general wet electrophotographic printing machine.

Figure 2 is a plan view schematically showing a dry unit of a wet electrophotographic printing press according to the present invention.

3 is an exploded perspective view illustrating the lower assembly portion of FIG. 2;

4 is an exploded perspective view illustrating the upper assembly portion of FIG. 2;

5 is a perspective view showing the auxiliary bracket portion of FIG.

6 is a perspective view of the combination of FIG.

<Description of the symbols for the main parts of the drawings>

100 ... frame 200 ... subassembly 210 ... main bracket

220 ... Dry Roller 300 ... Top Assembly 310 ... Secondary Bracket

320.Heat roller 330.3 Bracket

The present invention for achieving the above object is installed on the frame so as to be detachable to the photosensitive medium is equipped with a dry roller to absorb the liquid solvent remaining in the photosensitive belt, and includes a main bracket movably installed relative to the frame Subassembly; And a heating roller that heats the dry roller and is installed to be movable relative to the frame. The auxiliary bracket is coupled to the main bracket to move relative to the frame with the main bracket, and supports the heating roller. And an upper assembly including a third bracket installed to be movable relative to the auxiliary bracket so as to contact / disconnect the heating roller to the dry roller. The upper assembly may be first installed on the frame, and the upper assembly may be disposed on the lower assembly. The assembly of the unit is completed by installing the assembly.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a lower assembly including a dry roller 220 which may be in contact with the photosensitive medium 110, and including a main bracket 210 that is movable with respect to the frame 100 provided inside the printer ( 200, and an upper assembly 300 including an auxiliary bracket 310 coupled to the main bracket 210 and a third bracket 330 movably installed with respect to the auxiliary bracket 310. The main bracket 210 is subjected to an elastic force in a direction in which the dry roller 220 is in close contact with the photosensitive medium 110 by the first compression spring 218, the third bracket 330 is a heating roller 320 The elastic force is received by the second compression spring 318 in a direction in close contact with the dry roller 220. Therefore, the heating roller 320 is in close contact with the dry roller 220, and the dry roller 220 remains in close contact with the photosensitive medium 110 unless another force is applied.

As shown in FIG. 3, the lower assembly 200 is a structure in which both ends of the shaft 222 of the dry roller 220 are mounted to the main bracket 210 by a bearing 224, and assembled in a separate space to form a frame. It is mounted in the dry unit on (100). In the drawing, reference numeral 216 denotes a coupling plate for coupling to the auxiliary bracket 310 of the upper assembly 300, and reference numeral 215 denotes a coupling hole to which the hinge shaft is coupled.

As shown in FIG. 4, the upper assembly 300 has a through hole (311 of FIG. 5) through which the heating roller 320 penetrates and is moved at regular intervals, and an auxiliary bracket coupled to the main bracket 210 ( 310 and a third bracket 330 movably coupled to the auxiliary bracket 310 and supporting the heating roller 320.

A coupling plate 316 coupled to the coupling plate 216 of the main bracket 210 is formed at one side of the auxiliary bracket 310, and a cleaning for cleaning the heating roller 320 around the through hole 311. A hole 312 in which a shaft of a roller (not shown) is installed is formed. In addition, the guide bracket 319 is formed in the auxiliary bracket 310 so that the third bracket 330 may be in close contact / separation with respect to the auxiliary bracket 310.

The third bracket 330 is formed with a guide hole 332 through which the fixed flange 314 formed in the auxiliary bracket 310 can be inserted and guided, and the shaft 322 of the heating roller 320 by the bearing 324. ) Both ends are mounted. In addition, a movable flange 336 is installed at one side of the third bracket 330 to be spring-coupled with the compression spring 318 interposed between the fixed flange 314. Here, the guide member 338 is coupled between the movable flange 336 and the fixed flange 314. On the other hand, the lower portion of the third bracket 330 is attached to the movable plate 337 in contact with the arm connected by the cam not shown in order to space the third bracket 330 relative to the auxiliary bracket 310. Reference numeral 329 in the drawing denotes a guide groove fitted into the guide protrusion 319.

An assembly process of the upper assembly 300 will be described in more detail with reference to FIGS. 4 to 5.

First, as shown in FIG. 5, after passing through the shaft 322 of the heating roller 320 through the through hole 311 formed in the auxiliary bracket 310, as shown in Figure 4, the third bracket ( After coupling the bearing 324 to the semi-circular space portion 334 formed in the 330 and the fixed flange 314 protrudes to the guide hole 332, the compression spring 318 and the guide member 338 The assembly of the upper assembly 300 is completed by coupling the fixed flange 314 and the movable flange 336.

A process of assembling the upper and lower assemblies 200 and 300 assembled as described above to the frame 100 will be described with reference to FIGS. 2 and 6.

First, the plate member 218 of the lower assembly 200 is coupled to one side of the frame 100 via the compression spring 230, and the coupling plate 216 and the upper assembly 300 of the lower assembly 200 are coupled to each other. Final bonding is completed by joining the coupling plates 316.

In the dry unit of the wet electronic test type printing machine having the above configuration, the dry roller part of the dry unit components is assembled in the lower assembly form, and the heating roller and the third bracket part are divided into the upper assembly form in a separate space. In the intermediate assembly in the frame by combining the two assemblies in sequence there is an advantage that can reduce the assembly labor and assembly speed.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, it is only an example, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention should be defined by the attached utility model registration claims.

Claims (1)

A lower assembly including a main roller installed on the frame to be detachable from the photosensitive medium and absorbing the liquid solvent remaining in the photosensitive belt, the main roller being movable relative to the frame; And A heating roller for heating the dry roller is mounted and installed to be movable relative to the frame. The auxiliary bracket is coupled to the main bracket to move relative to the frame together with the main bracket, and supports the heating roller. And an upper assembly including a third bracket installed to be movable relative to the auxiliary bracket so as to contact / disconnect a heating roller to the dry roller. The upper assembly may be first installed on the frame, and then the upper assembly may be installed on the lower assembly. Dry unit of a wet electrophotographic printer, characterized in that the assembly of the unit is completed by installing a.