JPH03211142A - Roller structure - Google Patents

Abstract

PURPOSE:To prevent slackness from occurring in an threading engagement between a drive shaft and a roller part by installing the roller part, the drive shaft provided with an internal thread part formed in the inner circumference of its projecting part and an external thread part being screwed with the formed at the one end each, and a sleeve being screwed in an inverse external thread part of this drive shaft while coming into contact with an end face of the roller part, respectively. CONSTITUTION:Rotation in an A direction of a drive shaft 33 is transmitted to roller part 31 by means of a threading engagement between an external thread part 35 formed in the end part and an internal thread part 32 formed on the inner circumference of a projection of this roller part 31 which is therefore rotated. Since the engagement between the external thread part 35 of the shaft 33 and the internal thread part 32 of the roller part 31 is set to the same direction with a rotational direction of the roller part 31, when this roller part 31 is rotted in the reverse direction to the rotational direction against the shaft 33, the engage ment between these threading parts 35 and 31 becomes tight, so that such a possibility that the engagement between these elements might be loosened is thus prevented. When the roller part 31 is rotated in the same direction as the shaft 33, the external thread part 35 of the shaft 33 and the internal thread part 32 of the roller part 32 both are tightened by dint of a clamping torque between a sleeve 38 and an end face of the roller part 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a roller structure, and particularly to a roller structure for pinching and conveying a sheet-like member such as a photosensitive material.

[Prior Art] A roller generally includes a roller portion and a drive shaft protruding from both ends of the roller portion. When these roller parts and the drive shaft are constructed separately, the drive shaft is screwed into the roller part so that they are integrated, and by rotating this drive shaft, the roller part is rotated. It has become. Further, the drive shaft and the roller section are screwed together in the same direction as the rotation direction of the drive shaft so that the screw engagement between the drive shaft and the roller section does not loosen due to rotation of the drive shaft.

[Problems to be Solved by the Invention] However, in this roller drive structure, when the roller section is rotated in the conveying direction with respect to the drive shaft by an object to be conveyed, etc., the threading between the drive shaft and the roller section becomes impossible. There was a problem with it coming loose.

The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a roller structure that can prevent the screwing between the drive shaft and the roller portion from loosening.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a roller portion in which a cylindrical protrusion along the axis is formed at the end thereof, and a roller portion on the inner periphery of the protrusion of the roller portion. A female threaded portion formed in the same direction as the rotation direction of the female threaded portion, and a male threaded portion screwed into the female threaded portion formed at one end, and a reverse male threaded portion in the opposite direction to the male threaded portion with an intermediate portion having a larger diameter than the male threaded portion. The present invention is characterized in that it is provided with a drive shaft having an inverted male thread formed thereon, and a sleeve that is threadedly engaged with the reverse male threaded portion of the drive shaft and that comes into contact with the end surface of the roller portion.

[Operation] According to the present invention having the above configuration, the rotation of the drive shaft is caused by the screw engagement between the male threaded portion formed at the end of the drive shaft and the female threaded portion formed on the inner periphery of the protruding portion of the roller portion. transmitted,
The roller part rotates. The male threaded portion of the drive shaft and the female threaded portion of the roller portion are screwed together in the same direction as the rotational direction of the roller portion.

Therefore, when the roller section is rotated in the opposite direction to the rotational direction of the drive shaft due to an object to be transported, etc., the threading between the male threaded section of the drive shaft and the female threaded section of the roller section is tightened, and the drive shaft It is possible to prevent the screwing between the roller portion and the roller portion from loosening. Additionally, when the roller section is rotated in the same direction as the rotation direction of the drive shaft due to an object to be transported, etc., the sleeve comes into contact with the end surface of the roller section, and this tightening is caused by the torque of the drive shaft. It is possible to prevent the threaded engagement between the male threaded portion and the female threaded portion of the roller portion from loosening.

[Embodiment] FIG. 5 shows an embodiment of a waterless lithographic printing plate developing device 12 having a squeeze roller to which the roller structure according to the present invention is applied. This waterless planographic printing plate developing device 12
consists of a developing section 14 and a dyeing section 16, and a waterless 23 plate 11.
This equipment performs the necessary staining process to facilitate plate inspection work after developing the plate.

The waterless 23rd edition 11 used here is a patent application published in 1986-86.
177, in which a primer layer, a photosensitive layer, a silicone rubber layer, and a protective film are sequentially laminated on a substrate is used.

Further, the developer 18 used in the developing section 14 is
317843, an aqueous developer containing an organic solvent proposed in Japanese Patent Application No. 63-86177 is used.

The staining solution 17 used in the staining section 16 includes crystal violet, astrazone red, and the like.

The developer tank body 20 of the developer section 14 opens upward,
The bottom is formed in an inverted mountain shape, and a developer recovery tank 22 is formed in the center of the bottom. The developer 18 is contained in the developer recovery tank 22 .

Further, at the upper part of the developer tank main body 20, a pair of transport rollers 24, 26 and a pair of squeeze rollers 28 are arranged in order from the entrance side of the waterless 23rd plate 11. The transport roller pair 24, 26 and the squeeze roller pair 28 are supported by a rack side plate (not shown), and are rotated by the driving force of a driving means (not shown), and move the waterless 23rd plate 11 in the right direction in FIG. Nip and convey in the six directions of arrows in the figure).

Next, the roller structure of the conveyance roller pair 24 will be explained according to FIGS. 1 to 4. Note that the roller structures of the transport roller pair 26 and the squeeze roller pair 28 are similar to that of the transport roller pair 2.
Since it has the same structure as the roller structure of No. 4, the explanation will be omitted.

As shown in FIGS. 1 to 4, an end portion 31A of the roller portion 31 of the lower roller 30 of the conveying roller pair 24 is cylindrical and protrudes along the axis, and a drive shaft is attached to the end portion 31A. 33 and the roller portion 31 (six directions of arrows in FIGS. 3 and 4) and the same direction (rightward direction of the arrow in FIG. 3) as the female screw portion 32 is formed. A male threaded portion 35 formed at the end portion 33A of the drive shaft 33 is screwed into this female threaded portion 32 in the right direction of the arrow in FIG. 35 is threaded in the same direction as the rotational direction of the roller portion 31.

Further, as shown in FIGS. 1 and 2, the rotational force of a drive means (not shown) in the six directions of arrows in FIG. 1 is transmitted to the other end 33B of the drive shaft 33. The intermediate portion 33B adjacent to the end portion 33A of the drive shaft 33 has a larger diameter than the end portion 33A, and the intermediate portion 33B has a male threaded portion 35 (
A reverse male screw portion 37 is formed in the opposite direction (the right direction of the arrow in FIGS. 3 and 4) and the opposite direction (the direction of the arrow C in FIGS. 3 and 4). This reverse male threaded portion 37 has a cylindrical sleeve 38.
A reverse female threaded portion 39 formed in approximately half of the inner circumferential surface of the lower roller 30 side is screwed together.

That is, the threaded engagement between the reverse female screw portion 39 of the sleeve 38 and the reverse male screw portion 37 of the drive shaft 33 is in the opposite direction to the rotational direction of the roller portion 31 (the six directions of arrows in FIGS. 3 and 4). ,
The sleeve 38 is tightened toward the end surface 31B of the roller portion 31 (left side in FIG. 1) and is in contact with the end surface 31B.

As shown in FIG. 5, the squeeze roller pair 28 is disposed at the end of the transport path for the waterless 23rd plate 11 in the developing section 14, and is adapted to squeeze out the developer from the waterless 23rd plate 11. .

A brush roller 10 is arranged between the transport roller pair 26 and the squeeze roller pair 28. This brush roller 1
0 is for scraping off the photosensitive layer and silicone layer corresponding to the image area on the plate surface by rubbing the plate surface of the waterless 23 plate 11 being transported.

The brush roller 10 is also supported by a side plate (not shown) in the same manner as the pair of conveyance rollers 24.26 and the pair of squeeze rollers 28, and the driving force of a drive means (not shown) is transmitted to the pair of conveyance rollers 24.26 and the pair of squeeze rollers 28. It rotates in the same direction as the rotation direction (counterclockwise in Figure 5).

This brush roller 10 is adapted to rub the surface of the waterless 23rd edition 11 by rotating in the same direction (counterclockwise in FIG. 5) with respect to the conveying direction of the 23rd edition waterless edition 11. Further, depending on the case, it may be rotated in a direction that resists the conveyance direction of the waterless PS plate. The rotation speed of this brush roller 10 is 100 to 500 rpm (preferably 200 to 40 rpm).
0rpm). In some cases, it is preferable to install a waterless PS version vignetting prevention lever.

Since the brush roller 10 is rotating at high speed, the conveyance is carried out by roller pairs (24, 28', 106, 108, 109, etc.)
As will be described later, the transport speed of the PS plate may be faster than the transport speed of the PS plate due to the rotation of the drive shafts of these transport roller pairs, and this may cause loosening of the roller bodies and the drive shafts.

Further, by rotating the brush roller 10 and reciprocating it in the axial direction, the effect of scraping off the photosensitive layer and silicone layer on the plate surface of the waterless 23 plate 11 is further improved.

A support 40 made of a relatively flexible material such as plastic, for example high-density polyethylene, is disposed below the brush roller 10. When the waterless 23rd plate 11 passes through this passage, the surface of the receiver is rubbed by the brush roller 10 while the waterless 23rd plate 11 is supported on the stand 40, and the photosensitive layer and silicone layer corresponding to the image area are rubbed. is ensured to be scraped off. The lower part of the brush roller 10 may be a roller depending on the case.

A spray pipe 42 is arranged above the transport roller pair 24. This spray pipe 42 is provided with discharge ports 42A at appropriate intervals along the axial direction, facing the upper roller of the pair of transport rollers 24. This spray pipe 42 is connected via a valve 44 to a developer supply device, which will be described later, through a conduit 46.

As a result, the developer 18 is fed into the spray pipe 42, and is discharged to the upper roller of the transport roller pair 24, so that the developer is applied onto the waterless PS plate 11.

Spray pipes 48, 50 are also arranged between the pair of transport rollers 26 and the pair of squeeze rollers 28. The spray pipe 48 is disposed between the brush roller 10 and the conveying roller pair 26, and has a discharge port 48A formed therein similarly to the spray pipe 42. spray pipe 48
The discharge port 48A is provided facing the brush roller 10.

Like the spray pipe 42, this spray pipe 48 is also connected to a developer supply device, which will be described later, via a valve 44 through a pipe line branching from the pipe line 46. As a result, the developer is fed into the spray pipe 48, and the developer 18 is discharged and supplied to the brush roller 10.

Further, the spray pipe 50 has a discharge port 50A formed opposite to the upper roller of the squeeze roller pair 028. This spray pipe 50 also communicates with a developer supply device, which will be described later, through a pipe line branching from the pipe line 46 via the valve 44. This allows spray pipe 4
The developer 18 is fed into the squeeze roller pair 28, and the developer 18 is discharged to the upper roller of the squeeze roller pair 28.

A cover 52 having a substantially U-shaped cross section is disposed to extend from the conveying roller pair 26 to the upper part of the brush roller 10 .

This cover 52 prevents the developer 18 from being scattered by the brush roller 10 to other areas.

The pipe line 46 is connected to the discharge side of the circulation pump 54,
One end of a conduit 56 is communicated with the suction port side. The other end of the pipe 56 is communicated with the bottom of the developer recovery tank 22 via a valve 58 in the middle. By the operation of this circulation pump 54, the developer 18 in the developer recovery tank 22 is transferred to the pipe line 5.
6, it is sucked into the circulation pump 54 and sent through the line 46 to the spray pipe 42.48.50.

A flow rate sensor 60 is disposed in the middle of the conduit 46 and detects the flow rate of the developer 18 passing through the conduit 46 .

Further, a bypass line 62 is provided between the flow rate sensor 60 and the circulation pump 54, and an impedance detector 64 is provided in the middle of this line 62. This impedance detector 64 detects the impedance of the developer 18 passing through the conduit 62. This impedance detector 64
A generally known sensor is used.

A filter 66 is disposed in the middle of the conduit 56, and a filter 66 is installed in the middle of the conduit 56 to filter out the waterless PS plate 11 mainly from the developer passing through the conduit 48.
The photosensitive layer and development residue from the silicone layer that have been scraped off the surface of the photosensitive layer are filtered.

A branch pipe line 68 branches off from the middle of the pipe line 56 and communicates with an overflow tank 72 via a valve 70. The overflow tank 72 is disposed on the side of the developer recovery tank 22, is provided on a partition wall of the developer recovery tank 22, and communicates with the developer recovery tank 22 through a long hole 74 along the developer surface.

As a result, the surface layer of the developer 18 in the developer recovery tank 22 flows over the upper end of the lower partition wall 22A of the developer recovery tank 22 into the overflow tank 72. The overflow flow rate of the developer 18 into the overflow tank 72 is 1/10 to 8/10 (preferably 1/3 to 2) of the total circulation amount.
/3).

Furthermore, when the developer is replenished by a developer replenishing device (described later) and the level of the developer 18 rises, the upper partition wall 22B allows the developer residue once collected in the overflow tank 72 to flow into the developer recovery tank 22. I'm trying not to spread it.

As shown in FIG. 5, the overflow tank 72 has an opening formed at the top and is opened and closed with a lid 76, and is removed from the opening when maintenance is performed inside the overflow tank 72. The upper part of the side wall 78 of the overflow tank 72 is inclined to form an inclined wall 78A. A branch pipe line 68 is communicated through the lower part of the side wall 78, and the developer 18 in the overflow tank 72 is sucked by the operation of the circulation pump 54. This suction causes the developer 18 to flow in the direction of arrow F along the inclined wall 78A. In addition, the surface layer of the developer 18 in the developer recovery tank 22 flows into the overflow tank 72 due to the suction of the circulation pump 54, and the developer particles floating in the developer in the developer recovery tank 22 are removed from the overflow tank 7.
The developer particles flow into the inclined wall 78A and are collected.
It is sent into the conduit 68 by the flow. In this case, a silicone rubber layer is laminated on the surface of the waterless PS plate 11 for ink repellency, and when this silicone rubber layer is scraped off by the brush roller 10 together with the photosensitive layer corresponding to the image area, it becomes development residue. The developer is collected into the developer recovery tank 22 along with the excess developer. Developer recovery tank 2
In the developer in the developer 18, the developer residue has a lower specific gravity than the developer, so it floats to the surface of the developer 18. Also, the upper partition wall 22
B acts as a so-called weir to prevent the developer residue once collected in the overflow tank 72 from spreading into the developer recovery tank 22.

Further, an overflow pipe 80 is disposed within the overflow tank 72. This overflow pipe 80
The lower end of the overflow tank 72 extends outwardly through the bottom of the overflow tank 72, and the upper end thereof is set higher than the upper end of the upper partition wall 22B of the developer recovery tank 22. For this reason,
When the developer 18 is replenished by the developer replenisher described later and the level of the developer 18 in the developer recovery tank 22 rises, the surface layer of the developer 18 in the overflow tank 72 overflows together with the developer residue. No flow outwards by tube 80.

The developer replenishment device includes a developer solution tank 82 containing a developer solution, a water tank 84 containing water, a developer solution supply pump 86 for supplying the developer solution into the developer recovery tank 22, and a developer solution supply pump 86 for supplying water. It also includes a water supply pump 88 for supplying water into the developer recovery tank 22.

One end of a pipe 90 is communicated with the developer stock solution Kunk 82, and the other end is connected to a wide-mouth pipe 9 disposed in the developer recovery tank 22.
It opens to 2. A developing solution supply pump 86 is disposed in the middle of this pipe line 90.

The water tank 84 is connected to one end of a pipe line 94, and the other end opens to a wide-mouth pipe line 92 in the developer recovery tank 22.

A water supply pump 88 is disposed in the middle of this pipe line 94.

Further, a heater 98 is arranged at the bottom of the developer recovery tank 22 . This heater 98 is connected to a power source (not shown) to heat the developer 18. The temperature of the developer 18 is controlled by this heater 98 from 15° to 45° (
It is preferably set at 25° to 30°).

The developing time of this device is 10 seconds to 3 minutes (preferably 3 minutes).
0 seconds to 2 minutes), and the staining time is 5 seconds to 1 minute.
(preferably 10 seconds to 30 seconds).

Next, the dyeing section 16 will be explained.

The dye tank main body 100 of the dyeing section 16 opens upward like the developer tank main body 20, has an inverted mountain-shaped bottom, and has a dye solution recovery tank 102 formed in the center of the bottom. A dye solution 17 is stored in the dye solution collection tank 102 . An overflow pipe 104 is disposed within the dye solution recovery tank 102 . The upper end of this overflow pipe 104 is located in the upper part of the dye solution recovery tank 102, and the lower end penetrates the bottom of the dye solution recovery tank 102 and projects outward.

This overflow pipe 104 causes the dye solution 17 to be transferred to the dye solution collection tank 102 when the liquid level in the dye solution collection tank 102 rises and exceeds the upper end of the overflow pipe 104 due to replenishment of the dye solution by a dye solution replenishment device to be described later. The liquid level height of the staining liquid 17 is set by discharging from the inside to the outside.

At the top of the dyeing tank main body 100, a pair of transport rollers 106 and a pair of squeeze rollers 108 are arranged in order from the entrance side of the 23rd waterless version 11 into the dyeing tank main body 100 along the transport direction of the 23rd waterless version 11. There is.

The conveying roller pair 106 and the squeeze roller pair 108 are supported by rank side plates (not shown), and are rotated by the driving force of a driving means (not shown) being transmitted by the same roller structure as the conveying roller pair 24, thereby sandwiching the waterless 23 plate 11. transport. These conveyor rollers 7 pair 106 and squeeze roller pair 108 are made of a rubber material such as rubber material so as not to damage the surface of the waterless plate 11 being conveyed.

A pair of squeeze rollers 109 is arranged on the downstream side of the dyeing tank main body 100 in the conveyance direction of the waterless 23rd plate 11. This squeeze roller pair 109 is supported by a roller support structure similar to that of the squeeze roller pair 28, and the roll material is N.
It is made of BR rubber, tolyl butadiene rubber, etc., and the wipeability of the staining solution 17 is improved.

A brush roller 120 is arranged between the transport roller pair 106 and the squeeze roller pair 108.

Like the transport roller pair 106, the brush roller 120 is also supported by a side plate (not shown), and the driving force of a drive means (not shown) is transmitted to rotate the brush roller 120 in the direction opposite to the rotational direction of the transport roller pair 106 (
(Figure 5 clockwise).

This brush roller 120 has the same configuration as the brush roller 10 described above, and rotates in a direction (clockwise in FIG. 5) that resists the conveying direction of the waterless 23 plate 11.
It is designed to rub the surface of the plate 11. Depending on the case, the waterless PS plate 11 may be rotated in the forward direction with respect to the transport direction. brush roller 12
0 rotation speed is 100 to 500 rpm (preferably 200 rpm)
~400 rpm>. Furthermore, depending on the situation, it is preferable to turn on the vignetting prevention lever of the waterless PS plate 11.

A support stand 122 made of a relatively flexible material such as plastic, for example high-density polyethylene, is disposed below the brush roller 120.

Therefore, when the waterless PS version 11 passes through this passage,
While the waterless PS plate 11 is guided on the stand 122, the receiver
A staining liquid 17 is applied to the surface by a brush roller 120.

A spray pipe 124 is disposed above the brush roller 120. This spray pipe 124 is surrounded by a substantially U-shaped rectifier plate 126.

A suitable number of discharge ports 124A are formed in the spray pipe 124 along the axial direction so as to face the current plate 126.

This spray pipe 124 is connected via a valve 128 to a dye solution supply device to be described later through a conduit 130. As a result, the dyeing liquid is fed into the spray pipe 124 and discharged toward the current plate 126, and the dyeing liquid 17 is supplied to the brush roller 120 while being guided by the current plate 126. At this time, the staining liquid 17 spreads while flowing down on the rectifying plate 126 and is uniformly supplied onto the brush roller 120.

A spray pipe 132 is also arranged between the brush roller 120 and the squeeze roller pair 108 on the squeeze roller pair 108 side. Like the spray pipe 124, this spray pipe 132 is also surrounded by a substantially U-shaped rectifier plate 126. This spray pipe 132 is provided with a plurality of discharge ports 132A at appropriate intervals along the axial direction, facing the current plate 126. Similar to the spray pipe 124, the spray pipe 132 is connected to the conduit 13 via the valve 128.
0 communicates with a staining solution supply device, which will be described later. As a result, the dyeing liquid 17 is fed into the spray pipe 132, discharged toward the rectifying plate 126, guided, and supplied to the upper zero roller of the squeeze roller pair 108. At this time, staining solution 17
spreads while flowing down on the rectifying plate 126 and is uniformly supplied to the pair of squeeze rollers 108.

A cover 131 having a substantially U-shaped cross section is disposed above the brush roller 120 and squeeze roller pair 108. This cover 131 prevents the staining liquid 17 from being scattered by the brush roller 120.

The dye solution supply device includes a circulation pump 134 and a filter 136.
and a conduit 138 that communicates the circulation pump 134 and the dye solution recovery tank 102.

A pipe line 130 is connected to the discharge port side of the circulation pump 134,
One end of a conduit 138 is communicated with the suction port side.

The other end of the conduit 138 is communicated with the bottom of the dye solution recovery tank 102. Due to the operation of this circulation pump 134, the dyeing solution 17 in the dyeing solution recovery tank 102 passes through the pipe line 138.
It is sucked into circulation pump 134 and sent through line 130 to spray pipe 124,132.

A filter 136 is disposed in the middle of the conduit 138. , to remove the scum) from the silicone layer.

The staining liquid replenishing device is a staining liquid container 14 containing the staining liquid.
0, and a dye solution supply pump 142 for supplying the dye solution into the dye solution recovery tank 102.

One end of a conduit 146 is communicated with the dyeing solution tank 140, and the other end opens into a wide-mouthed conduit 92 disposed within the dyeing solution recovery tank 102. A dye solution supply pump 142 is disposed in the middle of this conduit 146.

A heater 98 is disposed at the bottom of the dyeing solution recovery tank 102 and is connected to a power source (not shown) to heat the dyeing solution. The temperature of this staining solution 17 is 15 to 45°C (preferably 2
temperature (0 to 30°C).

Next, the operation of this embodiment will be explained.

The image is printed by an image printing device (not shown), and the waterless 23 plate 11 is fed into the waterless lithographic printing plate developing device 12 and inserted into the developing section 14.

The portion of the photosensitive layer of the waterless 23 plate 11 inserted into the developing section 14 that is irradiated with light, that is, the exposed portion, hardens and adheres to the primer layer, and the unexposed portion is in a state where it can be swollen or eluted by the developer 18. It becomes.

From this state, after peeling off the protective film laminated to protect the surface of the waterless 23rd plate 11, the waterless 23rd plate 11 is inserted into the developing section 14, and is conveyed while being held between the pair of conveying rollers 24 of the developing section 14. The developer 18 is applied to the surface while being applied. As a result, the photosensitive layer in the unexposed area (image area) of the waterless 23rd plate 11 swells and becomes easily peeled off from the primer layer.

Further, the waterless 23rd plate 11 is held and conveyed by a pair of conveying rollers 26, and the brush roller 10 and the receiver are inserted between the pair 40. The brush roller 10 rotates in a direction (counterclockwise in FIG. 5) that follows the conveyance direction of the waterless 23rd plate 11, and the receiver passes over the table 40 and rubs the upper surface of the waterless 23rd plate 11. This brush roller 10
A developer 18 is also supplied to the waterless plate 11, and the surface of the waterless 23 plate 11 is rubbed by the brush roller 10 while being coated with the developer 18, and the photosensitive layer and silicone rubber layer swollen or eluted by the developer 18 are scratched. taken. As a result, a photosensitive layer and a silicone layer corresponding to exposed areas (non-image areas) remain on the waterless 23rd plate 11, and a positive image is formed.

The surplus developer 18 after the developer 18 applied to the surface of the waterless 23rd plate 11 falls into the developer recovery layer 22 and is collected.

Further, the water-free 23 is obtained by scraping off the photosensitive layer and the silicone layer in the unexposed area (image area) by the brush roller 10.
The plate 11 is held and conveyed by a pair of squeeze rollers 28, and the developer 18 is applied again, and the developer 18 is squeezed out from the waterless plate 11. This condition without water 23rd version 11
is inserted between the pair of transport rollers 106 of the dyeing section 16. The waterless plate 11 from which the developer 18 has been squeezed out is inserted between the brush opening 4-ra 120 and the receiver stand 1220. This brush roller 120 also has no water 23 like the brush roller 10.
The rectifier plate 126 rotates in a direction opposite to the conveying direction of the plate 11.
The dyeing liquid 17 that was guided and supplied by the waterless 23rd plate 11
Apply to the top surface. As a result, the staining liquid adheres to the primer layer, that is, the unexposed area (image area), and the dyeing is carried out.

Furthermore, the waterless 23rd plate 11 is inserted between the pair of squeeze rollers 108, and is moved to the upper roller of the pair of squeeze rollers 108.
Staining liquid 17 guided and supplied by current plate 126
While being applied to the surface, the dyeing solution 17 is squeezed out. This dyeing is done without water after development.
Since the surfaces of the image area and non-image area of the third plate 11 are the same color, this process is performed to make it easier to distinguish between the image area and the non-image area, and is performed for plate inspection work.

After the waterless 23 plate 11 with the image area dyed is sent out from the dyeing section 16, it is inserted between the squeeze roller pair 109, and the staining solution 17 remaining on the surface is wiped off. Since this squeeze roller pair 109 is made of 5 NBR rubber, the wiping property of the dyeing solution 17 is improved. In particular, if the staining solution 17 remains in the non-image area, the ink repellency of the silicone rubber layer will decrease.
Although it becomes impossible to obtain a good image during printing, since the staining liquid 17 is reliably squeezed out from the surface by the squeeze roller pair 109, a good image can be obtained.

Next, the circulation of the developer 18 in the developing section 14, removal of residue, and replenishment of the developer 18 will be explained.

Circulation> As shown in FIG. 5, the developer 18 in the developer recovery tank 22 is sent to the spray pipes 42, 48, 50 by the operation of the circulation pump 54, and the developer 18 is transported through the developer section 14 without water. Coated onto the 23rd plate 11. Excess developer 18 after coating the waterless 23rd plate 11 falls and is collected into a developer recovery tank 22.

There is no water in the developer collected into the developer recovery tank 22.
The developer scum from the photosensitive layer, silicone rubber layer, etc. that has peeled off from the surface of the third plate 11 is mixed in, and these developer scum have a specific gravity that is lighter than the developer, so the developer is removed from the developer in the developer recovery tank 22. floating on the surface.

<Scrap Removal> In this state, the developer 18 in the developer recovery tank 22 flows into the overflow tank 72 over the lower partition wall 22A. As a result, the developer residue floating on the surface layer of the developer 18 flows into the overflow tank 72 and is collected therein.

Furthermore, when the developer or water is replenished into the developer recovery tank 22, the level of the developer in the developer recovery tank 22 rises, and when it rises beyond the elongated hole 74, the developer in the overflow tank 72 rises. The height of the liquid level (in which developer residue is collected on the surface layer) also rises, and the upper end of the overflow pipe 80 is submerged in water. As a result, the developer 18 in the overflow tank 72 is discharged from the surface layer (in which development particles are floating) to the outside through the overflow pipe 80. At this time, the upper partition wall 22 of the developer recovery tank 22 forming the through hole 74
B acts as a weir, and prevents the developer particles once accumulated in the overflow tank 72 from being diffused into the developer recovery tank 22 due to the rise in the liquid level of the developer 18.

Next, prevention of loosening of the pair of transport rollers 28 will be explained.

As shown in FIGS. 1 and 2, the drive shaft 33
The rotation is caused by the screw engagement between the male threaded portion 35 formed at the end 33A of the drive shaft 33 and the female threaded portion 32 formed at the end 31A of the roller portion 31. , is transmitted to the roller section 31, and the roller section 31 rotates in the direction of the arrow in FIGS. 1 and 2.

As shown in FIG. 3, when the roller section 31 rotates relatively slowly with respect to the rotation of the drive shaft 33 due to an object to be conveyed such as a waterless PS plate, the roller part 31 rotates relatively slowly in the opposite direction to the conveying direction. (
A rotating force acts in the direction of the arrow in Fig. 3, and the drive shaft 3
The threaded engagement between the male threaded portion 35 of No. 3 and the female threaded portion 32 of the roller portion 31 is tightened, and the threaded engagement between the drive shaft 33 and the roller portion 31 can be prevented from loosening.

8 In addition, if a force is exerted on the drive shaft 33 by the conveyed section or the like that causes the roller section 31 to rotate at a relatively high speed relative to the drive shaft in the same direction as the rotation direction, the roller section 31 rotates in the direction of arrow E in FIG. Due to the force, the threaded engagement between the male threaded portion 35 of the drive shaft 33 and the female threaded portion 32 of the roller portion 31 is loosened, but as shown in FIG. 4, the reverse male threaded portion 37 of the drive shaft 33 and the sleeve 38
The threaded engagement with the reverse female threaded portion 39 is formed in the direction opposite to the rotating direction of the roller portion 31 (direction of arrow C in FIG. 4). Therefore, the tightening of the sleeve 38 against the end surface 31B of the roller section 31 can prevent the threaded engagement between the male threaded section of the drive shaft and the female threaded section 32 of the roller section 31 from loosening due to torque.

[Effects of the Invention] Since the present invention has the above configuration, an excellent effect can be obtained in that the screwing between the drive shaft and the roller portion can be prevented from loosening.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the roller structure according to the present invention, Fig. 2 is an exploded view of Fig. 1, Fig. 3 is a sectional view taken along the line 1-1119 of Fig. A line sectional view and FIG. 5 are schematic configuration diagrams showing a waterless lithographic printing plate developing device to which the roller structure according to the present invention is applied. 26... Conveyance roller pair, 30... Lower roller, 31... Roller part, 31A... End part, 31B... End surface, 32... Male thread part, 33... Drive shaft, 35 ...Male thread part, 37...Reverse male thread part, 38...Sleeve, 39...Reverse female thread part.

Claims (1)

[Claims] (1) A roller part with a cylindrical protrusion along the axis formed at the end, a female thread part formed on the inner periphery of the protrusion of the roller part in the same direction as the rotational direction of the roller part, and this female thread. a drive shaft having a male threaded portion formed at one end to be screwed into the male threaded portion, and an intermediate portion having a diameter expanded from the male threaded portion to form a reversed male threaded portion in a direction opposite to the male thread; A roller structure comprising: a sleeve that is screwed together and comes into contact with an end surface of the roller section.