JP2003195645A - Squeezing roller device for wet type developing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a squeezing roller device in which not only an upper squeezing roller but also a lower squeezing roller is easily detached and is cleaned outside. <P>SOLUTION: In a wet type developing device by which surplus developer stuck to a recording sheet X is removed by a pair of squeezing rollers 25 and 27 arranged on the side of an exit after an electrostatic latent image on the surface of the recording sheet X is developed with developer, a pair of supporting brackets 31 and 32 on which a mounting groove 34 to support the bearings 29 and 30 of the lower squeezing roller 25 is formed is fixed at the insides of the frame side walls 21 and 22 of a developing device and supporting grooves 51 and 52 to support the bearings 48 and 49 of the upper squeezing roller 27 are formed on the frame side walls 21 and 22 near the supporting brackets 31 and 32. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet developing device for developing a latent image using a developing solution, and more particularly to a squeeze roller device of a wet developing device for removing excess developing solution adhering to a recording sheet.

[0002]

BACKGROUND ART As is well known, for example, in a plate making machine or the like, a wet developing device for developing a latent image of a recording sheet (master sheet) having an electrostatic latent image formed on its surface with a developing solution is used. In a wet developing device, a recording sheet is passed between a pair of squeezing rollers that are in rolling contact with each other,
Excess developer adhering to the surface of the recording sheet is removed.

In the squeezing roller device used for such a purpose, when the surface of the squeezing roller is soiled with toner or the like during operation, the toner or the like attached to the squeezing roller is transferred to the surface of the recording sheet, Since the valuable image surface is contaminated with the transfer toner and the like and the image quality is deteriorated, it is necessary to keep the surface of the aperture roller clean.

[0004]

Therefore, in the conventional art,
In order to perform maintenance cleaning of the squeezing roller regularly or irregularly, the upper squeezing roller, which is the driven side, can be easily removed from the developing device frame, and the squeezing roller is cleaned.

However, since the driven lower squeezing roller is provided with a sprocket wheel to which a driving chain is applied, it cannot be easily removed, and if a structure for simply removing the lower squeezing roller is adopted, the developing solution is contained inside. A hole is opened in the developing device frame to be accommodated, and the developing solution flows out through the hole, so the lower squeezing roller is not washed.

Therefore, when the lower squeeze roller is gradually soiled as the plate making machine is operated, the toner attached to the lower squeeze roller is transferred to the back surface of the recording sheet or the upper squeeze roller. This may cause deterioration of image quality or stains on peripheral devices. The purpose of the present invention is to
In view of the problems of the conventional squeezing roller device of the wet type developing device as described above, it is an object of the present invention to obtain a squeezing roller device in which not only the upper squeezing roller but also the lower squeezing roller can be easily removed for external cleaning. .

[0007]

In order to achieve this object, the present invention relates to a method of developing an electrostatic latent image on the surface of a recording sheet with a developing solution, and then rollingly contacting a pair of aperture rollers positioned on the exit side. In a wet-type developing device that removes excess developer adhering to a recording sheet by movement, a pair of support brackets that have mounting grooves that can support the bearing of the lower squeezing roller are fixed inside the frame side wall of the developing device. The present invention proposes a squeezing roller device of a wet type developing device in which a supporting groove capable of supporting a bearing of an upper squeezing roller is formed on a side wall of the frame adjacent to a bracket.

In the description of preferred embodiments of the present invention described later, 1) A driven coupling which constitutes a claw clutch is fixed to the shaft end of the lower squeezing roller, and a frame side wall is provided corresponding to the driven coupling. The structure in which the driving shaft provided is provided with a driving coupling that contacts the driven coupling, 2) the wet developing device is a plate making machine, and the recording sheet is a master sheet will be explained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a plate making machine according to the present invention shown in the drawings will be described below. FIG. 1 shows an overall cross section of a digital plate making machine capable of processing a digital image or an original image as needed, and a master sheet roll having a different size can be mounted on the lower right portion of the machine body 1 capable of blocking external light. The sheet feeding device 2A and the second sheet feeding device 2B are incorporated.

The first sheet feeding device 2A and the second sheet feeding device 2B include a detachable mounting drum 2a to which a master sheet roll can be attached, a feeding roller 2b for pulling out the leading end of the master sheet X, and the master sheet X. A cutter 2c for cutting to a designated length and a paper feed roller 2d are provided respectively, and the cut master sheet X passes through the first path 3a and the second path 3b and is located above the first paper feeding device 2A. It is sent to the paper feed path 3. A charging electrode unit 4 for charging the master sheet X is provided in the middle of the sheet feeding path 3.
The master sheet X passing through the charging electrode unit 4 is supplied to the feed roll 5 at the center of the upper part of the machine body 1 which is driven at a sub-scanning speed. A laser scanning unit 6 for scanning an original image in the main operation direction perpendicular to the paper surface of FIG. 1 is located above the paper feeding path 3, and a digital image from a computer (not shown) is scanned by the laser scanning unit 6. The surface of the feed roll 5 is scanned from 6.

The surface of the master sheet X positioned on the feed roll 5 is beam-scanned by the laser scanning unit 6 under the controlled rotation of the feed roll 5, and the original image is formed on the photosensitive surface of the master sheet X by the scanning. Although formed into a latent image, the latent image-forming master sheet X is supplied to an exposure table device 8 arranged in a substantially vertical direction in a substantially central portion of the machine body 1 through an intermediate guide unit 7, and then from the exposure table device 8. It is delivered to the wet developing device 9 located at the lower left of the machine body 1. Further, in the upper left portion of the machine body 1, a document table 1 for optically capturing a document image is provided.
0 is provided, and the image of the document on the document table 10 is projected onto the surface of the exposure table 8a of the exposure table device 8 using the exposure optical system 11. That is, the illustrated exposure optical system 11 includes an illumination lamp 11a that illuminates the document table 10 on which a document is set, a projection lens 11b that forms a document image on the surface of the exposure table 8a, and a mirror 11c.

The above-mentioned wet developing device 9 has a developing solution nozzle 13 for ejecting a developing solution onto the developing pallet 12 through which the master sheet X passes, and the developing pallet 12 is inclined downward in the conveying direction of the master sheet X. A developer tank 14 for collecting the developer is located below the. Further, a squeeze roller device 15 is located at the rear end of the developing pallet 12, and the excessive developing solution on the surface of the master sheet X is removed by the rotational movement of the squeeze roller device of the squeeze roller device 15 described later. .

The master sheet X on which the original image has been developed is dried by the heat fixing device 16 adjacent to the exit side of the wet developing device 7 to fix the toner image, and the discharge roller 17 provided on the lower left side of the machine body 1 is fixed. It is collected on the collecting tray 18 outside the machine body 1 by the discharging movement.

2 to 4 show the details of the wet developing device 9 described above. The wet developing device 9 has a pair of frame side walls 21 and 22 in which the above-mentioned developing pallet 12 and developing solution nozzle 13 are arranged. Is equipped with. That is, the master sheet X on which the electrostatic latent image is formed is moved by the feeding movement of the take-in roller 23 onto the inclined developing pallet 12,
The electrostatic latent image is developed by the developing solution ejected in layers from the developing solution nozzle 13. Further, a squeeze roller device 15 for removing the excess developer adhering to the master sheet X is provided at the exit of the developing pallet 12, and the squeeze roller device 15 is provided.
The excess developing solution is squeezed out by the pressure contact / rolling motion of the lower squeezing roller 25 and the upper squeezing roller 27 constituting the above, but an auxiliary nozzle 28 is positioned above the developing pallet 12 close to the squeezing roller device 15. The surface of the master sheet X and the peripheral surfaces of the lower squeeze roller 25 and the upper squeeze roller 27 are cleaned by the developer ejected from the auxiliary nozzle 28.

As shown in FIGS. 2 and 3, the bearings 29 of the lower squeeze roller 25 are provided on the lower portions of both frame side walls 21 and 22.
A pair of "U" -shaped support brackets 31, 32 to which 30 can be attached are fixed. That is, mounting grooves 34 cut from the upper surface are formed in the support brackets 31 and 32, respectively, and the corresponding mounting grooves 34 are engaged with the peripheral surfaces of the bearings 29 and 30 fitted to both end shafts of the lower aperture roller 25. A peripheral groove 29a that can be fitted is formed, and a driven coupling 36 forming a claw clutch is fixed to the shaft end of the lower aperture roller 25 corresponding to one frame side wall 22. In order to drive the lower squeezing roller 25, an auxiliary bracket 39 pivotally supporting a driving shaft 37 is fixed to the outer surface of the frame side wall 22 corresponding to the support bracket 32, and the driving chain 41 shown in FIG. The drive sprocket 42, to which is attached, is fixed.

A driving coupling 44, which is combined with the driven coupling 36 and constitutes a pawl clutch, is fixed to the shaft end of the driving shaft 37 penetrating the side wall of the frame. That is, as shown in FIG. 5, a pair of claw members 36a are projected on the end surface of the driven coupling 36,
The corresponding pawl member 3 is provided on the corresponding end surface of the other driving coupling 44.
Since the recess 44a into which the 6a falls is formed, the drive coupling 44 and the driven coupling 36 can be rotationally coupled by matching the positions of both in the rotational direction, and the lower squeezing roller 25 can be simply attached and detached. Can easily remove the rotationally coupled state.

On the other hand, open windows 46 are formed in the upper portions of the support brackets 31, 32 of the frame side walls 21, 22, respectively, and the auxiliary nozzle 28 is suspended between these open windows 46. At the lower edge of the open window 46, the bearing metal 48, 4 of the upper squeezing roller 27, which is a driven roller,
Support grooves 51 and 52 capable of supporting 9 are formed respectively. That is, the cylindrical bearing metal 4 of the upper drawing roller 27
Abraded surfaces corresponding to the groove widths of the support grooves 51 and 52 are formed in the reference numerals 8 and 49, and the upper squeezing roller 27 is attached to the frame side wall 21 only by fitting the bearing metals 48 and 49 into the corresponding support grooves 51 and 52. , 22 can be suspended.

Further, as shown in FIG. 4, the supporting grooves 51, 5
In order to prevent accidental disengagement of the bearing metals 48, 49 from 2, the "L" shaped lock lever 53 is attached to the outer surface of the frame side walls 21, 22. That is, the shaft 5 in the middle part
A biasing spring 55, which is hung between the lock lever 53 and the frame side walls 21 and 22, is fixed to one end of the lock lever 53 which can be pivoted about 4 as a fulcrum, and the opposite end thereof is a bearing metal supported by the support grooves 51 and 52. It is applied to the upper surfaces of 48 and 49. Therefore, the bearing metals 48, 49 of the upper squeezing roller 27 are prevented from being disengaged from the support grooves 51, 52 by the lock lever 53 urged by the urging spring 55. To remove from 48, 49,
Actuating cams 57 are attached to the outer surfaces of the frame side walls 21 and 22. When the actuating cam 57, which is an eccentric cam, is rotated, the lock lever 53 moves against the force of the urging spring 55.
Since the lock lever 53 is separated from the bearing metals 48 and 49 by rotating the bearing metal 48 and 49 in the clockwise direction, the upper squeezing roller 27 can be freely removed from the support grooves 51 and 52.

The aperture roller device 15 according to the illustrated embodiment is
Since the structure is as described above, the lower squeezing roller 25 and the upper squeezing roller 27 are arranged as follows.
Since it can be easily removed from 2, the dirt can be removed by external cleaning. In the operating state of the plate making machine, since the driven coupling 44 is engaged with the driven coupling 36 of the lower squeezing roller 25 of the squeezing roller device 15,
Rotational force is transmitted to the lower squeezing roller 25 via the driving shaft 37, the driving coupling 44, and the driven coupling 36 by the power from the drive chain 41, and the lower squeezing roller 25 and the upper squeezing roller 27 are brought into pressure contact / rolling motion. As a result, the excess developer on the surface of the master sheet X is removed.

In order to remove the lower diaphragm roller 25 and the upper diaphragm roller 27 of the diaphragm roller device 15 at the time of maintenance or the like, the lock lever 53 is separated from the bearing metals 48 and 49 by the operating cam 57 and both shafts of the upper diaphragm roller 27 are removed. The end bearing metals 48 and 49 may be removed from the support grooves 51 and 52. That is, if the upper squeezing roller 27 is gripped and the bearing metals 48 and 49 are lifted upward along the support grooves 51 and 52, the bearing metals 48 and 49 reach the open window 46, and therefore the open window 46. The upper squeezing roller 27 can be pulled out to the outside by utilizing the wide space.

Next, the bearing 2 having the lower squeezing roller 25 and on the side opposite to the driven coupling 36 is provided as shown in FIG.
When the lower squeezing roller 25 is tilted so that 9 is on the upper side, the bearing 29 is disengaged from the corresponding mounting groove 34. It naturally escapes from the place 44a. Therefore, if the entire lower squeezing roller 25 is lifted upward along the inclination of the mounting groove 34, the bearing 30 on the side corresponding to the driven coupling 36 will also be naturally disengaged from the mounting groove 34, so that there is a gap between the frame side walls 21, 22. By simply lifting the lower squeezing roller 25 upward, the lower squeezing roller 25 can be completely removed from the wet developing device 9.

In order to reassemble the lower squeezing roller 25 and the upper squeezing roller 27 into the wet developing device 9 after external cleaning of the lower squeezing roller 25 and the upper squeezing roller 27, contrary to the above, the driven coupling 36 is not used. When the lower squeezing roller 25 is tilted so that the bearing 29 on the opposite side is on the upper side and the bearing 30 on the side of the driven coupling 36 is aligned with the corresponding mounting groove 34, the driven coupling 36 approaches the driving coupling 44, so that the driven coupling 36 is driven. The pawl member 36a of the coupling 36 is used as the main coupling 4
If the lower squeezing roller 25 is placed in a substantially horizontal state in accordance with the recess 44a of No. 4, the mounting groove 3 of the support bracket 31 on the opposite side
Since the bearing 29 corresponding to 4 naturally matches, the mounting groove 34
It suffices to fit the circumferential groove of the bearing 29 into the. That is, the bearings 29 for the mounting grooves 34 of the support brackets 31, 32,
As shown in FIG. 7, the lower squeezing roller 2 is inserted by inserting 30.
5 and the driving shaft 37 are aligned with each other, and the claw member 36a of the driven coupling 36 is recessed in the driving coupling 44.
The drive sprocket 42 is rotationally coupled to the lower squeezing roller 25 by engaging a.

Next, the upper squeezing roller 27 is opened from the open window 46.
Is introduced into the space between the frame side walls 21 and 22, the bearing metals 48 and 49 at the shaft ends of the upper squeezing roller 27 are fitted into the corresponding support grooves 51 and 52, and the lock lever 5 is attached by the mounting groove 34.
When 3 is returned to the normal position, the force of the biasing spring 55 can return the upper squeezing roller 27 to the state of being pressed against the lower squeezing roller 25.

In the above-mentioned embodiment, an example in which the present invention is applied to the wet developing device 9 of the plate making machine has been described, but the present invention can be applied to a wet developing device for other purposes. In the above, the example in which the lower squeeze roller 25 is the main drive side is given, but in the present invention, the upper squeeze roller 27 may be the main drive side.

[0025]

As is apparent from the above description, according to the present invention, the lower squeezing roller and the upper squeezing roller can be easily attached to and detached from the side wall of the frame. The toner stain of can be eliminated in advance.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a plate making machine to which the present invention is applied.

FIG. 2 is a plan view of a wet developing device of the plate making machine.

FIG. 3 is a cross-sectional view of the wet developing device taken along line 3-3 in FIG.

FIG. 4 is a right side view of the wet developing apparatus.

FIG. 5 is an exploded explanatory view of the coupling of the aperture roller.

FIG. 6 is a process explanatory diagram of the lower squeezing roller during disassembly and assembly.

FIG. 7 is a process explanatory view of a lower squeezing roller in an assembled state.

[Explanation of symbols]

X master sheet 9 Wet developing device 15 Squeezing roller device 21,22 Frame side wall 25 Lower aperture roller 27 Upper aperture roller 29,30 bearings 31, 32 Support bracket 34 mounting groove 36 Driven coupling 37 Drive shaft 42 Drive sprocket 44 Drive Coupling

Claims (3)

[Claims] 1. A wet method in which an electrostatic latent image on the surface of a recording sheet is developed with a developing solution, and then excess developing solution adhering to the recording sheet is removed by rolling contact movement of a pair of aperture rollers positioned on the outlet side. In the developing device, a pair of support brackets having a mounting groove capable of supporting the bearing of the lower squeezing roller are fixed inside the frame side wall of the developing device, and the bearing of the upper squeezing roller is supported on the side wall of the frame adjacent to the supporting bracket. A squeezing roller device of a wet type developing device, in which a supporting groove that can be formed is formed. 2. A driven coupling which constitutes a claw clutch is fixed to a shaft end of the lower squeezing roller, and a driven shaft provided on a frame side wall corresponding to the driven coupling is joined to the driven coupling. The squeeze roller device of the wet type developing device according to claim 1, wherein a driving coupling is provided. 3. The squeeze roller device of the wet developing device according to claim 1, wherein the wet developing device is a plate making machine, and the recording sheet is a master sheet.