JP2000211101A - Liquid scraper for rotator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a liquid entering into the gap between a main doctor blade and an auxiliary blade by disposing the auxiliary blade on the rear side in the rotational direction of the contact part of main doctor blade while decreasing the interval. SOLUTION: An auxiliary blade 14 employing an nonflammable film is bitten to the lower part of a doctor supporting table 11 in a wiping unit on the rear side in the rotational direction of a wiping roller 6 with respect to the contact part of a main doctor blade 12 and the auxiliary blade 14 is brought into contact with the wiping roller 6 under flexed state. A force acts on the forward end of the auxiliary blade 14 reversely to the rotational direction of the wiping roller 6 due to resiliency of the nonflammable film and prevents a cleaning 5 liquid from creeping over the doctor blade 12 during high speed rotation of the wiping roller 6. Since the liquid entering into the gap between the main doctor blade 12 and the auxiliary blade 14 can be decreased, a product can be protected against contamination.

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 more particularly to a wiping mechanism for removing excess ink adhering to the surface of an intaglio printing plate of a printing press, and a device for scraping excess ink on the printing plate in gravure printing. It is about.

[0002]

2. Description of the Related Art For example, a printing operation by an intaglio printing machine is
The ink is transferred to the intaglio printing plate by the ink inking machine, and of the transferred ink, the ink adhering to the extra portions other than the intaglio printing part is brought into contact with the intaglio printing plate surface and wiped off with a rotating wiping roller. Ink is transferred to paper passing between the intaglio cylinder and the impression cylinder to perform printing. The wiping roller is immersed in a cleaning liquid such as an aqueous solution of caustic soda placed in a liquid tank, and is driven and rotated in a direction opposite to the rotation of the cylinder of the plate surface, thereby removing ink that has reached the surface. The wiping roller being driven and rotated is prevented by the liquid scraping device from rotating the cleaning liquid in the liquid tank, so that the cleaning liquid does not adhere to the intaglio cylinder.

A conventional liquid scraping apparatus will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, an intaglio cylinder 1 is supported by a machine frame (not shown) so as to be rotatable in the direction of arrow A in the figure. On the peripheral surface of the intaglio cylinder 1, an intaglio plate surface 2 having an image portion formed in a concave shape is mounted. The wiping device 3 is provided with a box-shaped liquid tank 4, and the liquid tank 4 stores a cleaning liquid 5. Wiping roller 6 in the liquid tank
Are rotatably supported reciprocally in the axial direction, and the lower part of the wiping roller 6 is immersed in the cleaning liquid 5. The wiping roller 6 is driven and rotated in the direction of arrow B opposite to the intaglio cylinder 1 in the drawing, and the peripheral surface of the wiping roller 6 is in contact with the surface of the intaglio plate surface 2 of the intaglio cylinder 1.

The liquid tank 4 is provided with five brush shafts 7 along the axial direction of the wiping roller 6.
Is provided with a brush holder 8 and a brush 9 is planted. A nylon scourer 10 is wound on each brush. The brush 9 is in contact with the peripheral surface of the wiping roller 6 in the cleaning liquid 5 via the nylon scrubber 10. In the liquid tank 4, a doctor support 11 is provided on the exit side from the cleaning liquid 5. The doctor support base 11 is provided with a doctor blade 12 that is in contact with the peripheral surface of the wiping roller 6.
By operating the screw handle 13, the doctor support base 11 can move forward and backward with respect to the wiping roller 6, and the gap between the doctor blade 12 and the wiping roller 6 is adjusted. Wiping roller 6 by doctor blade 12
The cleaning liquid 5 adhering to and entraining on the peripheral surface of the member is scraped off.

The ink is transferred to the surface of the intaglio plate surface 2 on the intaglio cylinder 1 by an inking device (not shown), and the ink other than the image portion is wiped off by the wiping roller 6 and adheres to the peripheral surface of the wiping roller 6. The ink adhering 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 nylon scrubber 10. The cleaning liquid 5 adheres to the wiping roller 6 from which the ink has been removed, while the cleaning liquid 5 comes out of the cleaning liquid 5, and the cleaning liquid 5 on the peripheral surface is scraped off by the doctor blade 12. As a result, there is no stain on the intaglio printing plate surface 2 where the cleaning liquid 5 rotates together with the wiping roller 6.

[0006]

In the wiping apparatus described above, when the wiping roller 6 rotates at a high speed as shown in FIG.
2 and the doctor blade 12 is slightly damaged, or the wiping roller 6
When the surface was scratched, linear wiping residue was sometimes generated immediately.

Further, in order to solve the drawbacks caused by the liquid scraping device for a rotating body, the liquid scraping device for a rotating body disclosed in JP-A-8-244200 and JP-A-8-244201 is provided with an auxiliary blade. In the prior art, a complicated adjustment mechanism is provided which comprises a support bracket for adjusting the contact pressure of the auxiliary blade, three holders, a rotating pin, an adjustment spring, a double nut and a notch for inserting a tool. Therefore, it was necessary to adjust the contact pressure by operating these.

Further, since such an adjusting mechanism is provided, a gap is formed between the doctor blade 12 and the auxiliary blade 14 to the extent that the jig for adjustment is provided. The cleaning liquid 5 collected by the centrifugal force of the rotation of 6 sometimes scattered from both sides of the doctor blade 12 to cause a failure.

Furthermore, when the auxiliary blade 14 is a metal blade, it is too hard to scrape off the liquid of the rotating body excessively, so that the friction between the main doctor blade 12 and the rotating body becomes large, and the doctor blade intermittently rotates. In some cases, a swing event occurred. In such a state, the rotating body was greatly worn, which led to a dimensional change of the rotating body. An object of the present invention is to solve the problems of these conventional liquid scraping devices.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating body liquid scraping apparatus having a main doctor blade and an auxiliary blade, wherein the main doctor blade and the auxiliary blade are respectively provided with respective bases. The liquid scraping device is characterized in that the end portions are integral and the tip portions of the respective auxiliary blades are provided close to each other so that the rotating body does not bite between the main doctor blade and the rotating body. provide.

Further, the auxiliary blade may be formed from a non-combustible film.

Further, the auxiliary blade may be cut.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid scraping device for a rotating body according to the present invention will be described based on an embodiment with reference to FIGS. The apparatus shown in FIG. 3 is applied to a cleaning liquid scraping apparatus for scraping a cleaning liquid from a wiping roller in a wiping apparatus of a printing press. Therefore, a detailed description of the wiping device is omitted.

As shown in FIG. 3, on the doctor support 11 of the wiping device, on the rear side (lower side in the figure) of the wiping roller 6 in the rotational direction of the wiping roller 6 with respect to the contact portion of the doctor blade 12.
An auxiliary blade 14 using a non-combustible film is held under the doctor support base, and is in contact with the wiping roller 6 with the auxiliary blade 14 bent. Due to the elasticity of the noncombustible film, a force opposite to the rotation direction of the wiping roller 6 acts on the tip of the auxiliary blade 14 to prevent the cleaning liquid 5 from flowing to the doctor blade 12 when the wiping roller 6 rotates at high speed. I do.

At this time, by providing the auxiliary blade 14 close to the main doctor blade 12 used in the liquid scraping device of the rotating body, the liquid entering the gap D can be reduced.

Further, by using a non-combustible film for the auxiliary blade 14 and setting it in a bent state, as shown in FIG.
Is elastically in contact with the wiping roller 6 due to its elasticity. And always the non-combustible film auxiliary blade 14
Does not particularly need an adjusting mechanism for adjusting the contact pressure, because it contacts the wiping roller with a constant force depending on its elasticity. However, the non-combustible film auxiliary blade 1
Since the thickness and the length of the protrusion of 4 greatly affect the elasticity, they need to be selected depending on the liquid to be scraped off.

Furthermore, since the auxiliary blade 14 is a non-combustible film and comes into contact with the wiping roller 6 in a deflected state, the force enough to overcome the rotation of the wiping roller 6 and completely scrape the cleaning liquid 5 is obtained. No, 8
There is only a scraping rate of 0 to 90%. The cleaning liquid 5 that has not been completely wiped acts in a direction to solve the problem that the friction between the main doctor blade and the wiping roller 6 is increased, and the intermittent doctor blade that occurs when the auxiliary blade is a metal blade is used. Swing can be eliminated.

In the method in which the thin elastic noncombustible film is held in place, the edge may be wavy as shown in FIG. 4 if not processed. Therefore, as shown in FIG. 5, a cut 15 is made in the cutting edge of the auxiliary blade 14 to absorb the undulation, and the cutting edge can be uniformly contacted with the rotating body in an independent manner.

Further, as shown in FIG. 5, the auxiliary blade 14 has a cut 15 in the cutting edge thereof to prevent the cutting edge of the auxiliary blade 14 from waving.

[0020]

Since the present invention is configured as described above, it has the following effects.

By providing the auxiliary blade with the space narrowed rearward in the rotation direction with respect to the contact portion of the main doctor blade, the liquid entering the gap between the main doctor blade and the auxiliary blade can be reduced, and the product can be contaminated. Can be prevented.

By using an incombustible film having elasticity for the auxiliary blade, the liquid of the rotating body is scraped off by 80 to 90%, so that the metal main blade does not directly hit the rotating body due to the remaining liquid. That is, the wear of the rotating body and the main blade is prevented from increasing.

When the auxiliary blade is brought into contact with the rotating body while being bent, it is not necessary to adjust the contact pressure of the auxiliary blade, and the contact adjusting mechanism can be omitted.

By making a cut in the cutting edge of the auxiliary blade, the cutting edge of the auxiliary blade comes into direct contact with the rotating body, and the scraping becomes uniform. As a result, even if the contact of the main blade with the rotating body is light, it can be easily scraped,
The burden on the main blade is reduced, leading to an increase in the life of the main blade.

[Brief description of the drawings]

FIG. 1 is a side view of a wiping device provided with a conventional liquid scraping device.

FIG. 2 is a side view of the doctor blade in FIG.

FIG. 3 is a side view with an auxiliary blade according to an embodiment of the present invention.

FIG. 4 is a three-dimensional view of a case where the cutting edge of the auxiliary blade is not cut.

FIG. 5 is a three-dimensional view in which a notch is formed in the edge of the auxiliary blade.

[Explanation of symbols]

 Reference Signs List 5 cleaning liquid 6 wiping roller 11 doctor support base 12 doctor blade 14 auxiliary blade 15 cut

Claims (3)

[Claims] A liquid scraping device for a rotating body including a main doctor blade and an auxiliary blade, wherein the main doctor blade and the auxiliary blade are integrated at a base end thereof, and at a distal end thereof, A liquid scraping device characterized in that the tip of the auxiliary blade is provided close to each other so as not to bite between the main doctor blade and the rotary body by the rotary body. 2. The liquid scraping device according to claim 1, wherein said auxiliary blade is formed of a non-combustible film. 3. The liquid scraping device according to claim 1, wherein the auxiliary blade has a cut.