JPH0966596A - Liquid scraping apparatus for rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid scraping apparatus for a rotor which makes it possible to satisfactorily scrape off liquid with high flexibility and facilitates the replacing operation with an excellent durability. SOLUTION: The scraping apparatus comprises a wiping roller 26 partly dipped in cleanser 25 in a liquid tank 24 and rotatably driven, add a scraper 44 brought into contact with the side of the roller 26 at the output side from the tank, wherein the scraper 44 is formed of silicone sponge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid scraping device for a rotating body, and is suitable for application to a wiping device for removing ink adhering to the surface of the body of a printing machine.

[0002]

2. Description of the Related Art For example, when printing with an intaglio printing machine,
The ink is transferred to the intaglio surface on the intaglio cylinder by the inking device, and the ink that has adhered to the areas other than the image area of the transferred ink is wiped off by the wiping roller that rotates against the intaglio surface. Printing is performed by transferring a part of the ink to the paper passing between the intaglio cylinder and the impression cylinder. The wiping roller is dipped in a cleaning liquid such as a caustic soda solution contained in a liquid tank and driven to rotate to remove the ink adhering to the surface. The rotatably driven wiping roller prevents the cleaning liquid in the liquid tank from being entrained by the liquid scraping device and prevents the cleaning liquid from adhering to the intaglio cylinder.

A conventional liquid scraping device will be described with reference to FIGS. 6 and 7. FIG. 6 shows the overall state of a wiping device equipped with a conventional liquid scraping device, and FIG. 7 shows VII in FIG.
The state of view is shown.

As shown in FIG. 6, an intaglio cylinder 1 is rotatably supported by a machine frame (not shown) so as to be rotatable in the direction of arrow A in the figure, and an image line portion is formed in a concave shape on the peripheral surface of the intaglio cylinder 1. The intaglio 2 is attached. The wiping device 3 is provided with a box-shaped liquid tank 4, and a cleaning liquid 5 is stored in the liquid tank 4. A wiping roller 6 is supported in the liquid tank 4 so as to be rotatable and axially reciprocable, and a lower portion of the wiping roller 6 is immersed in the cleaning liquid 5. The wiping roller 6 is rotationally driven in the direction of arrow B in the figure opposite to the intaglio cylinder 1,
The peripheral surface of the wiping roller 6 is in contact with the surface of the intaglio plate 2 of the intaglio cylinder 1.

Further, the liquid tank 4 is provided with four brush shafts 7 along the axial direction of the wiping roller 6, and the brush shafts 7
A base 8 is attached to the. A brush 9 is planted in the base 8, and the brush 9 is in contact with the peripheral surface of the wiping roller 6 in the cleaning liquid 5 via the pad 10. A doctor 11 is provided in the liquid tank 4 on the outlet side of the wiping roller 6 from the cleaning liquid 5, and the doctor 11 is provided with a doctor blade 12 that comes into contact with the peripheral surface of the wiping roller 6. The doctor 11 can be moved back and forth with respect to the wiping roller 6 by operating the screw handle 13, and the gap between the doctor blade 12 and the wiping roller 6 is adjusted. By the doctor blade 12, the cleaning liquid 5 attached to the peripheral surface of the wiping roller 6 and rotated along with it is scraped off.

As shown in FIGS. 6 and 7, the side plate 1 of the liquid tank 4
A support shaft 15 parallel to the axis of the wiping roller 6 is provided on the support 4, and a table 16 is movably supported along the support shaft 15. A compression spring 17 is provided on the outer periphery of the support shaft 15 between the side plate 14 and the table 16, and the table 16 is urged by the compression spring 17 toward the side surface 6a of the wiping roller 6. A scraper 18 extending substantially horizontally is fixed to the table 16, and the scraper 18 is pressed against the side surface 6a of the wiping roller 6 by the spring force of the compression spring 17 so as to follow the axial movement of the roller. Scraper 18
As a result, the cleaning liquid 5 attached to the side surface (end surface) 6a of the wiping roller 6 and being entrained is scraped off. Incidentally, reference numeral 19 in FIG. 7 is a guide shaft for guiding the movement of the table 16.

The ink is transferred to the surface of the intaglio plate 2 on the intaglio cylinder 1 by an inking device (not shown), and the ink other than the image area is wiped off by the wiping roller 6 and adheres to the peripheral surface of the wiping roller 6. The ink attached to the wiping roller 6 is removed in the cleaning liquid 5 by the dissolving action of the cleaning liquid 5 and the pressing action of the pad 10. Although the cleaning liquid 5 is attached to the wiping roller 6 from which the ink has been removed when the cleaning liquid 5 is ejected, the cleaning liquid 5 on the peripheral surface is scraped off by the doctor 11 and the cleaning liquid 5 on the side surface 6a is scraped off by the scraper 18. To be scraped off. This allows
It is possible to prevent the cleaning liquid 5 from rotating with the wiping roller 6 and adhering to the intaglio plate 2.

[0008]

By the way, in the conventional liquid scraping apparatus, the scraper 18 for preventing the liquid from splashing and scattering on the side surface of the wiping roller 6 has a nonwoven fabric made of synthetic fibers (see FIG. 8). And the winding plate 20a is wound around the rubber 20 in a double layer.
It was used by being sandwiched between 16b.

However, the nonwoven fabric loses its elasticity and loses its elasticity in a short time (this becomes more conspicuous when the cleaning liquid soaks into the nonwoven fabric as the cleaning liquid is scraped), so that it is possible to follow the irregularities and scratches on the side surface of the roller. There is a problem that the cleaning liquid is not scraped off sufficiently and the cleaning liquid scatters on the intaglio plate 2 due to the centrifugal force to dissolve the ink on the intaglio plate 2 and generate a defective printed matter (see liquid drop shown by an arrow in FIG. 6). ). Also, it is troublesome to replace the non-woven fabric sandwiched between the contact plates 16a and 16b with a new one because the workability is poor.

[0010]

The structure of the present invention for solving the above-mentioned problems is a liquid scraping apparatus for a rotating body, which is equipped with a scraping member that comes into contact with a rotating body that is rotationally driven. Is formed of a porous silicon material. According to the above structure, the followability to the irregularities and scratches of the roller is good, the liquid scraping action is sufficiently exerted, and the durability and the replacement workability are improved.

If the scraping member is a scraper that comes into contact with the side surface of the wiping roller that is driven to rotate by being partially immersed in the liquid in the liquid tank, the unevenness of the roller side surface is provided. It has good followability to scratches and scratches and is suitable. Further, when the scraper is detachably supported by the box-shaped holder, it is preferable in terms of workability of replacement.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a liquid scraping apparatus for a rotating body according to the present invention will be described with reference to FIGS.
The one shown in the figure is applied to a cleaning liquid scraping device for scraping the cleaning liquid from a wiping roller in a wiping device of a printing machine. Therefore, detailed description of the wiping device is omitted. 1 is a side view of a wiping device equipped with this device, FIG. 2 is a plan view of the same, FIG. 3 is a detailed view of an arrow III portion of FIG. 1, FIG. 4 is a view taken along the line IV-IV of FIG. 3, and FIG. FIG. 4 is an explanatory diagram of a wiping roller.

As shown in FIG. 1, an intaglio cylinder 21 is rotatably supported by a machine frame (not shown) so as to be rotatable in the direction of arrow A in the figure, and an image line portion is formed in a concave shape on the peripheral surface of the intaglio cylinder 21. An intaglio 22 is attached. The wiping device 23 is provided with a box-shaped liquid tank 24, and a cleaning liquid 25 is stored in the liquid tank 24. A wiping roller 26 as a rotating body is supported in the liquid tank 24 so as to be rotatable and axially reciprocable, and a lower portion of the wiping roller 26 has a cleaning liquid 25.
Is soaked in. The wiping roller 26 is an intaglio cylinder 21.
The wiping roller 26 is rotatably driven in the direction of arrow B in the figure, and the peripheral surface of the wiping roller 26 is in contact with the surface of the intaglio plate 22 of the intaglio cylinder 21. The cleaning liquid 25 in the liquid tank 24 is provided with a brush member (not shown) that comes into contact with the peripheral surface of the wiping roller 26 to remove the ink.

As shown in FIGS. 1 and 2, the slide base 27 is provided on the upper surface of the liquid tank 24 on the outlet side of the cleaning liquid 25 of the wiping roller 26 via a guide guide (not shown).
Is supported by the wiping roller 26 so as to be movable back and forth, and a doctor 28 is movably supported by the slide base 27. When the wiping roller 26 is attached to or detached from the intaglio cylinder 21, the slide base 27 is interlocked and retracted via a cam (not shown). A hydraulic cylinder 29 is attached to the slide base 27.
The operating portion of is connected to the doctor 28 by a pin 30. The slide base 27 is expanded and contracted by the hydraulic cylinder 29
On the other hand, the doctor 28 is moved, and the doctor 28 can be moved forward and backward independently of the wiping roller 26. Further, the doctor 28 can also be moved with respect to the slide base 27 by the screw handle 31, and the doctor 28 can be manually moved back and forth with respect to the wiping roller 26.

The doctor blade 3 is a blade extending along the axial direction of the wiping roller 26.
2 is fixed, and the doctor blade 32 contacts the peripheral surface of the wiping roller 26. By operating the screw handle 31 to move the doctor 28, the gap between the doctor blade 32 and the wiping roller 26 is adjusted.

As shown in FIGS. 1 and 2, a bracket 34 is fixed to the liquid tank 24 on the side surface 33 side of the wiping roller 26 on the side where the cleaning liquid 25 exits from the cleaning liquid 25.
A supporting member 35 is fixed to the side surface 33 of the wiping roller 26. Two holes 36 are formed in the support member 35.
A guide cylinder 37 is slidably fitted in each hole 36. Each guide cylinder 37 is biased by a spring 38 toward the side surface 33 of the wiping roller 26. A pad 39 is fixed to the guide cylinder 37, and the pad 3
9 is in contact with the side surface 33 of the wiping roller 26 by the urging force of the spring 38.

A part (lower part) of the pad 39 is soaked in the cleaning liquid 25 in the liquid tank 24, and the pad 39 prevents the cleaning liquid 25 attached to the side surface (end surface) 33 of the wiping roller 26 from entraining. ing. Support member 35
A notch pin 41 urged by a spring 40 is supported on one side of the hole 36, and the tip end of the notch pin 41 is in contact with the outer peripheral surface of the guide cylinder 37. A notch hole 42 is formed in the guide cylinder 37 that fits into one hole 36, and when the guide cylinder 37 is moved in the direction of separating the pad 39 from the side surface 33 of the wiping roller 26 against the biasing force of the spring 38. The tip end of the notch pin 41 is fitted into the notch hole 42 to fix the moving position of the guide cylinder 37. When the tip of the notch pin 41 is removed from the notch hole 42 against the urging force of the spring 40, the urging force of the spring 38 moves the guide cylinder 37 so that the pad 39 contacts the side surface 33 of the wiping roller 26 (see FIG. 2). State shown). The distance r1 from the center P of the wiping roller 26 to the pad 39 with respect to the distance R from the center P of the wiping roller 26 to the liquid surface of the cleaning liquid 25
, The pad 39 is arranged in a state of R> r1.

Since the pad 39 is constantly pressed against the side surface 33 of the wiping roller 26 by the urging force of the spring 38, the pad 39 keeps contacting with the side surface 33 following the axial movement of the wiping roller 26. Further, since the pad 39 is supported by the support member 35 by the two guide cylinders 37, it does not rotate even if it receives a frictional force from the wiping roller 26. Since the pad 39 partially provided with the cleaning liquid 25 in the liquid tank 24 is provided, the pad 39 exists at a position where the side surface 33 of the wiping roller 26 is separated from the cleaning liquid 25, and the wiping roller 26 is provided.
The cleaning liquid 25 that adheres to the side surface 33 of the above and tends to rotate is separated below the liquid surface.

When the wiping roller 26 is replaced by abrasion or the like, for example, a driver is pushed between the pad 39 and the side surface 33 of the wiping roller 26 to pull the pad 39 away from the side surface 33 against the biasing force of the spring 38. As a result, the tip of the notch pin 41 is fitted in the notch hole 42, the moving position of the guide cylinder 37 is fixed, the pad 39 is held at a position away from the side surface 33 of the wiping roller 26, and the wiping roller 26 is replaced. . After the exchange,
By removing the tip of the notch pin 41 from the notch hole 42 against the urging force of the spring 40, the guide cylinder 37 is moved by the urging force of the spring 38 and the pad 39 is moved to the wiping roller 2.
6 to the side surface 33.

Accordingly, since the cleaning liquid 25 attached to the side surface 33 of the wiping roller 26 is separated below the liquid surface by providing the pad 39 of the present invention, the cleaning liquid 25 is rotated by the rotation of the wiping roller 26. It will not jump out. Further, since the cleaning liquid 25 is scraped below the liquid surface, the scraped cleaning liquid 25 does not scatter around, and atomization of the cleaning liquid 25 can be prevented. As a result, the generation of rust on the peripheral members is suppressed and the working environment is improved.

On the other hand, as shown in the drawing, a scraper unit 43 is detachably provided on the doctor 28 as the apparatus main body side, and the scraper unit 43 is positioned on the side surface 33 of the wiping roller 26 and above the pad 39. The scraper 44 that comes into contact with each other is supported via the box-shaped holder 45. The scraper 44 is attached to the end 44a of the scraper 44 near the rotation center P of the wiping roller 26.
Of the wiping roller 26 on the opposite side of the
Side end portion) 44b is inclined toward the cleaning liquid 25 side in the liquid tank 24.

The cleaning liquid 25 adhering to the side surface 33 of the wiping roller 26 is simultaneously moved downward due to its own weight and outwardly moved by centrifugal force, and flows down at an angle. Scraper 4
The inclination angle θ of 4 is almost the same as this falling angle 20
It is set in the range of 30 to 30 degrees. The scraper 44 is arranged such that the distance r2 from the center P of the wiping roller 26 to the liquid surface of the cleaning liquid 25 to the end 45 of the scraper 44 is substantially equal (R≈r2). There is. The relationship between the distance R and the distance r2 may be substantially equal or the distance r2 may be set short.

Accordingly, the side surface 33 of the wiping roller 26
All the cleaning liquid 25 attached to the surface of the scraper is scraped off by the scraper 44, and the end 44b of the scraper 44 is inclined toward the cleaning liquid 25 side in the liquid tank 24. Four
It smoothly flows down along the lower surface of No. 4 and is returned into the liquid tank 24. For this reason, the cleaning liquid 25 that circulates from the side surface 33 of the wiping roller 26 does not exist at all, the cleaning liquid 25 does not scatter from the liquid tank 24 to the surroundings, and atomization of the cleaning liquid 25 can be prevented. As a result, the generation of rust on the peripheral members is suppressed and the working environment is improved.

The supporting condition of the scraper unit 43 will be described with reference to FIG. As shown in the figure, a fixed base 50 is fixed to the upper surface of the doctor 28. Fixed base 5
A guide member 51 is attached to 0, and the guide member 51 is located above the doctor blade 32 and can be removed by operating the handle 52. In addition, the guide member 51
Is positioned by the handle 52 and the reference pin 53. A guide shaft 54 parallel to the central axis of the wiping roller 26 is fixed to the guide member 51, and a slide piece 55 as a moving member is reciprocally movable via a linear motion bearing 56 and rotates in the rotation direction. Is supported not to. That is, the slide piece 55
The support portion of is located above the doctor blade 32.

An upper end of an arm member 57 extending below the doctor blade 32 is fixed to the slide piece 55, and a box-shaped holder 45 is fixed to a lower end of the arm member 57. A support pin 58 is fixed to the side surface of the guide member 51, and a tension spring 59 as a biasing member is provided across the support pin 58 and the slide piece 55. That is, the slide piece 55 is urged upward in FIG. 3 by the tension spring 59, and the scraper 44 follows the axial reciprocating movement of the wiping roller 26 and always contacts the side surface 33. By operating the handle 52, the guide member 51, the guide shaft 54, the slide piece 55, the arm member 5
The scraper unit 43 including the support pin 58, the tension pin 59, the tension spring 59, and the scraper 44 is detachable from the doctor 28.

In this embodiment, as shown in FIG. 4, the scraper 44 is made of silicon sponge and is pushed into the box-shaped holder 45 having a slightly tapered opening. A silicon material other than sponge may be used as long as it is porous and has elasticity. Silicon sponge is not only heat and alkali resistant (wiping liquid is alkaline at 40-50 ° C), but also has good water repellency and durability without losing elasticity (more than 10 times that of conventional products). Experiments have shown that the scraping is also good.

As shown in FIG. 5, the wiping roller 26 is coated with vinyl chloride resin (PVC) 26a on its surface to polish the outer diameter, but the corners are easily scratched by the doctor blade 32. It is chamfered. Further, the side surface is coated by bending inward as shown in the drawing so that the vinyl chloride resin 26a is not peeled off, but this portion is not machined but has an uneven shape (when this portion is machined, (It is not usually processed because it easily separates from the boundary between the wiping roller 26 and the vinyl chloride resin 26a). The silicon sponge sufficiently follows the irregularities and chamfered portions on the side surface with a light spring pressure to prevent liquid rising and liquid splashing. Further, since the box-shaped holder 45 has a tapered opening, a silicon sponge (scraper 4) can be used while the liquid is being scraped (during operation).
4) does not fall off the box-shaped holder 45.

In the illustrated embodiment, the scraper unit 43 is detachably attached to the doctor 28, but the scraper unit 43 can be detachably attached to the bracket fixed to the liquid tank 24 on the apparatus main body side. It is also possible to attach it. In short, if the scraper unit 43 is attachable to and detachable from the apparatus main body side and the supporting portion of the slide piece 55 is located above the doctor blade 32, the above-described embodiment It is not limited to the configuration.
Further, in the above-described embodiment, the slide piece 55 is reciprocally supported by the guide member 51 via the linear motion bearing 56, but other supporting means such as interposing a slide bush of resin or gun metal may be applied. It is possible.
However, in this case, the slide bush 55 is prevented from rotating by making the outside of the slide bush rectangular.

Therefore, the scraper unit 43 is detachably attached to the apparatus main body side, and the supporting portion of the slide piece 55 is positioned above the doctor blade 32, so that a space for replacing the wiping roller 26 is obtained. Is sufficiently secured, and the cleaning liquid 25 scraped off by the doctor blade 32 is not applied to the support part of the reciprocating movement of the scraper 44. Therefore, the workability of the roll exchange is improved, the reciprocal movement of the scraper 44 is not obstructed, the reliability of the follow-up movement of the scraper 44 is improved, and the contact angle and the contact pressure of the wiping roller 26 to the side surface 33 are improved. It becomes possible to keep it. Further, since it is possible to supply oil to the support portion of the slide piece 55, the durability of the support portion is improved and the support portion can be used in a favorable environment, and the reliability of the follower movement of the scraper 44 is further improved. Further, since the scraper unit 43 can be easily removed from the apparatus main body side only by removing the handle 52, the operability is improved and the worker's hands are not contaminated due to the fact that the cleaning liquid 25 is not applied.

Although the above-described embodiment is applied to the case of scraping the cleaning liquid of the wiping roll in the wiping device of the printing machine as the liquid scraping device, the liquid scraping device of the present invention is applied to the gravure printing machine. It can also be applied as a device (doctor device) for scraping off excess ink from the peripheral surface of the plate cylinder.

In the wiping device of the printing machine having the cleaning liquid scraping device, the ink adhered to the wiping roller 26 is removed in the cleaning liquid 25. When the cleaning liquid 25 comes out of the cleaning liquid 25, the cleaning liquid 25 is attached to the wiping roller 26 from which the ink has been removed.
5 is scraped off by the doctor blade 32. In addition, all the cleaning liquid 25 adhering to the side surface 33 of the wiping roller 26
Are separated below the liquid surface by the pad 39 and scraped off. Further, the cleaning liquid 25 flowing out from the peripheral surface of the wiping roller 26 to the side surface 33 before being scraped by the doctor blade 32 is scraped by the scraper 44 which comes into contact with the side surface 33 following the axial movement of the wiping roller 26. .

Since the above-mentioned cleaning liquid scraping device is provided, the cleaning liquid 2 is rotated by the rotation of the wiping roller 26.
It is possible to prevent the cleaning liquid 25 from being atomized because the cleaning liquid 25 does not fly around from the side surface 33 and scatter around. This suppresses the generation of rust on the peripheral members and improves the working environment. Also, scraper 4
Since the cleaning liquid 25 scraped off by the doctor blade 32 does not splash on the support part of the reciprocating movement of the scraper 4, the scraper 4
The reciprocating movement of No. 4 is not obstructed, the reliability of the follow-up movement of the scraper 44 is improved, and the contact angle and the contact pressure of the wiper roller 26 with respect to the side surface 33 can be maintained well. Improves reliability. Further, the distance R between the pad 39 and the scraper 44 and the distances r1 and r
The dimensional relationship with 2 is specified as in the example, and the scraper 4
By inclining No. 4, it is possible to eliminate obstruction of the reciprocating movement of the scraper 44 due to atomization of the cleaning liquid 25. As a result, the cleaning liquid 2 from the wiping roller 26
5 can be completely scraped off, and the generation of defective printed matter caused by the cleaning liquid 25 dissolving the ink on the intaglio plate 22 mounted on the intaglio cylinder 21 can be greatly reduced.

[0033]

The liquid scraping device for a rotating body according to the present invention comprises:
In a liquid scraping device for a rotating body having a scraping member that comes into contact with a rotating body that is driven to rotate, since the scraping member is formed of a porous silicon material, it has good followability to irregularities and scratches on the surface of the rotating body. , The liquid scraping action is fully exerted, and the durability and exchange workability are improved.
In addition, if the scraping member is a scraper that comes into contact with the side surface of the wiping roller that is driven to rotate by being partially immersed in the liquid in the liquid tank, the scraping member can protect the side surface of the roller from unevenness and scratches. Good followability and effective.
Further, when the scraper is detachably supported by the box-shaped holder, it is effective in terms of replacement workability.

[Brief description of drawings]

FIG. 1 is a side view of a wiping device including a liquid scraping device according to an exemplary embodiment of the present invention.

FIG. 2 is a developed plan view of FIG.

FIG. 3 is a detailed view of an arrow III portion in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a structural explanatory view of a wiping roller.

FIG. 6 is an overall view of a wiping device including a conventional liquid scraping device.

FIG. 7 is a view on arrow VII in FIG.

FIG. 8 is a structural explanatory view of a scraper.

[Explanation of symbols]

21 Intaglio cylinder 22 Intaglio 23 Wiping device 24 Liquid tank 25 Washing liquid 26 Wiping roller 27 Slide base 28 Doctor 29 Hydraulic cylinder 30 Pin 31 Screw handle 32 Doctor blade 33 Side 34 Bracket 35 Supporting member 36 Hole 38 Spring 39 Pad 40 Spring 41 Notch pin 42 Notch hole 43 Scraper unit 44 Scraper 45 Box holder 50 Fixed base 51 Guide member 52 Handle 54 Guide shaft 55 Sliding piece 56 Linear motion bearing 57 Arm member 58 Support pin P Center of wiping roller R From center of wiping roller to liquid surface Distance r1 Distance from wiping roller center to pad r2 Distance from wiping roller center to scraper

Claims (3)

[Claims] 1. A liquid scraping device for a rotating body, comprising a scraping member that comes into contact with a rotating body that is driven to rotate, wherein a part of the scraping member formed of a porous silicon material is a liquid in a liquid tank. Equipped with a rotating body that is immersed and rotated
A liquid scraping apparatus for a rotating body, comprising a scraper that comes into contact with a side surface of the rotating body on the exit side from the liquid tank, wherein the scraper is formed of a porous silicon material. apparatus. 2. The scraping member is a scraper, which is in contact with a side surface of a wiping roller, which is driven to rotate by being partially immersed in the liquid in the liquid tank, on a side on the exit side from the liquid tank. Liquid scraping device for rotating bodies. 3. The liquid scraping device for a rotating body according to claim 2, wherein the scraper is detachably supported by a box-shaped holder.