JP2572671Y2 - Doctor's deburring device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing so-called burrs on a doctor of a gravure printing press.

[0002]

2. Description of the Related Art In gravure printing, a doctor slides on the surface of a plate cylinder rotating at a high speed, so that a so-called flash is generated at the cutting edge. That is, the blade edge of the doctor contacts the hard plate cylinder surface and is rubbed and worn by the plate cylinder surface. The scraped metal portion accumulates on the cutting edge to form a linear shape, and eventually peels off from the cutting edge. But,
A part of the metal portion may remain on the cutting edge and project from the cutting edge to the surface of the plate cylinder in an ice column shape. This is what is called burrs.

The burrs come in contact with the plate cylinder and disturb the adhesion state of the ink. For this reason, stains occur on the printed matter, resulting in a decrease in print quality. Conventionally, when such burrs occur, the operator detects the burrs from the printed matter, goes to the corresponding unit, presses a sharp burring tool made of wood or the like against the back of the doctor and slides it several cm. I have to. The burrs fall off the cutting edge by such an operation.

[0004]

However, the above-described conventional burrs removal operation requires a hand-held burrs removal tool to be applied to a point which is closer to the inside of the doctor by about 0.5 mm, which is difficult to perform. . Further, the operation must be performed during the operation of the printing press, which is dangerous. In addition, the removal tool may be accidentally applied to the surface of the plate, and in such a case, the printed matter becomes stained.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a gravure printing press, in which a blade of a doctor is pressed from its back toward the surface of a plate cylinder to remove burrs formed on the blade. A removing press piece, a pressing cylinder for pressing the burrow removing press piece against the back of the doctor when removing the burrs, and a burr removing press piece and a pressing cylinder for removing the burrs. And a transfer cylinder for moving the doctor along the longitudinal direction of the doctor.

[0006]

When the operator finds out the burrs on the printed matter during delivery of the gravure printing machine, the operator activates the transport cylinder of the printing unit. Thereby, the deburring pressing piece moves along the longitudinal direction of the doctor. Further, at a predetermined time, the pressing cylinder is operated, and the deburring pressing piece presses the blade of the doctor from its back toward the plate cylinder surface. As a result, the burrs fall off the blade of the doctor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a device for removing burrs of a doctor will be described with reference to FIGS.

Each printing unit of the gravure printing machine is shown in FIG.
As shown in FIG. 1, a plate cylinder 1 for printing a predetermined color.
And an ink pan 3 for supplying ink 2 to the plate cylinder 1
And a doctor 4 for scraping surplus ink from the surface of the plate cylinder 1 and an impression cylinder 6 for pressing the printing paper 5 (or film) against the plate cylinder 1.

The printing paper 5 is, for example, a five-color print.
It passes through one printing unit and is discharged to a delivery (not shown). As shown in FIGS. 1 and 4, each doctor 4 is provided with each plate cylinder 1 a, 1 b, 1 c, 1 d, 1.
The support portion 7 also extends along the central axis of e and is supported at both ends by a frame (not shown) of the printing press.

Each of the doctor support portions 7 is provided with a deburring pressing piece 8 for pressing the blade of the doctor 4 from the back thereof toward the surface of the plate cylinder to remove the flash generated on the blade.
The burrs 9 occur, for example, as shown in FIG.

The deburring pressing piece 8 is a rectangular parallelepiped small piece as shown in FIG. 3, and is made of hard rubber or hard resin. In order to be able to push the doctor 4 with an appropriate force, the size of its cross section is, for example, 5 mm in width and 2 mm in thickness.
mm, and the hardness of the material is about 80 degrees. Also,
The angle of the deburring pressing piece 8 with respect to the doctor 4 is about 30.
° is set. As a material, NBR (nitrile butyl rubber) is used in consideration of solvent resistance.

Each of the deburring pressing pieces 8 is attached to the tip of a piston rod 10 a of a pressing cylinder 10. The pressing cylinder 10 is a flat cylinder arranged along the width direction of the doctor 4, and constantly urges the flat cylinder body 10b, the piston 10c reciprocating therein, and the piston rod 10a toward the retracted side. And a compression spring 10d. The cylinder 10 is an air cylinder, and operates at an air pressure of, for example, 3 to 5 kg / m ² .

When air is injected from the compressed air supply port 10e, the piston rod 10a protrudes, and the deburring pressing piece 8 moves to the position shown by the two-dot chain line to move the cutting edge 4a of the doctor 4 to the position. It is pressed toward the surface of the plate cylinder 1.
Conversely, when the compressed air is discharged from the compressed air supply port 10e, the piston rod 10a retracts into the cylinder body 10b due to the return force of the compression spring 10d, and the deburring pressing piece 8 separates from the doctor 4 and moves to the solid line position. Return to

In order to prevent the ink from entering the driving portion of the cylinder 10, the space between the front end of the cylinder body 10b and the rear end of the deburring pressing piece 8 is covered with a rubber bellows 11. ing.

The positional relationship between the tip of the deburring pressing piece 8 and the cutting edge 4a of the doctor 4 can be finely adjusted. That is, the cylinder body 10b is slidably attached to a block portion 12 described later, and is pressed by a tension spring 14 against a tip of an adjusting screw 13 screwed to the block portion 12. By turning the adjusting screw 13 in either direction, the deburring pressing piece 8 approaches or separates from the cutting edge 4a of the doctor 4 together with the cylinder 10. The distance between the tip of the deburring pressing piece 8 and the blade 4a of the doctor is preferably 0.5 mm to 1.0 mm, and the pressing amount is preferably about 1 mm. It is possible. The adjusting screw 13 may have a double screw structure.

The deburring pressing piece 8 and the pressing cylinder 10 are attached to a block section 12 which is a movable section of a transfer cylinder 15 arranged along the longitudinal direction of the doctor 4. The transfer cylinder 15 is a rodless air cylinder, and is attached to the support 7 of the doctor 4. By driving the transfer cylinder 15, the deburring pressing piece 8 can move along the blade edge 4a of the doctor.

As shown in FIG. 2, the block portion 12 has an upper and lower double structure, and the upper portion is supported by a lower portion via a horizontal pin 22 so as to be able to lower. The horizontal pin 22 extends along the longitudinal direction of the doctor 4, so that the deburring pressing piece 8 rotates around the horizontal pin 22 together with the upper part, so that the angle with respect to the doctor 4 can be finely adjusted. An adjusting screw 23 penetrates the upper part up and down, and a tip of the adjusting screw 23 contacts the upper part. By turning the adjusting screw 23, the angle can be finely adjusted and then fixed.

As shown in FIG. 4, each of the pressing cylinders 10 and each of the transfer cylinders 15 are connected to a compressor 16 as a compressed air supply source by a tube 17,
At predetermined positions of the tube 17, opening / closing valves 18a, 19a, 18b, 19b, 18c, 19 correspond to the respective printing units.
c, 18d, 19d, 18e, and 19e are provided. Each on-off valve 18a, 19a, 18b, 19b, 18
The opening and closing of c, 19c, 18d, 19d, 18e and 19e are controlled by the control unit 20.

The control unit 20 includes buttons 21a, 21b, 21c, 21 corresponding to the printing units of each color on the operation panel 21.
The operation is performed by the operator pressing d and 21e, and in response to a signal from the button operation, an open signal is sent to the opening / closing valve of the pressing cylinder 10 and the transport cylinder 15 of the corresponding printing unit, A signal processing circuit is provided for sending a closing signal to both valves when the cylinder 12 moves from one end of the cylinder body of the transfer cylinder 15 to the other end.

Next, a series of operations of the burring removal device of the doctor 4 will be described. It is assumed that the operator finds printing smear due to burrs in the delivery of the gravure printing press (see FIG. 4), and determines that this is caused by burrs 9 of the doctor 4 in the plate cylinder 1a.

The operator immediately presses the corresponding button 21a on the operation panel 21. The control unit 20 sends a signal to the on-off valves 18a and 19a according to a signal from the operation panel 21. On-off valve 18
a, 19a open their valves and send compressed air to the corresponding transfer cylinder 15 and pressing cylinder 10.
As a result, the burr removal pressing piece 8 projects to the position shown by the two-dot chain line as shown in FIG.
Is pressed against the plate cylinder 1 side. At the same time, the block portion 12 moves from one end to the other end along the cutting edge of the doctor 4. Accordingly, the burrs removing pressing piece 8 moves so as to trace while pressing the blade 4a of the doctor, and the burrs 9 drop off from the blade 4a by the pressing force.

Thereafter, when the block unit 12 reaches the other end, the control unit 20 sends a closing signal to the on-off valves 18a and 19a. Since the on-off valves 18a and 19a cut off the supply of compressed air to the transfer cylinder 15 and the pressing cylinder 10,
The pressing piece 8 for removing burrs is separated from the doctor 4, and the block portion 12 stops.

The operator confirms that the printed matter has not been stained in the delivery, and ends the burring operation. When burrs occur in other printing units, they can be removed by operating the same button as described above.

[0024]

[Effects of the Invention] The present invention has the above-described structure, and therefore, the burrs can be automatically removed. Therefore, there is no need for the operator to approach the rotating plate cylinder,
Burr removal operation can be performed safely. In addition, since there is no irregularity in hand due to the removal of burrs, it is possible to reliably prevent the occurrence of printing stains. Further, since the cylinder is used as the driving source, the burring removal operation can be safely performed in gravure printing using a solvent.

[Brief description of the drawings]

FIG. 1 is a perspective view of a device for removing burrs of a doctor according to the present invention.

FIG. 2 is a schematic side view of one unit of a gravure printing press provided with the burring device of the doctor.

FIG. 3 is a partially cutaway plan view of a main part of the burring device of the doctor.

FIG. 4 is a system diagram of the device for removing burrs of the doctor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plate cylinder 4 ... Doctor 8 ... Burr removal pressing piece 9 ... Burr 10 ... Pressing cylinder 12 ... Block part 15 ... Transport cylinder

Claims (1)

(57) [Scope of request for utility model registration] 1. A burr removal press piece for pressing a blade of a doctor in a gravure printing machine from the back thereof toward a surface of a plate cylinder to remove burrs generated on the blade, and the burrs when removing the burrs. Including a pressing cylinder for pressing the removing pressing piece against the back of the doctor, and a transport cylinder for moving the burring removing pressing piece and the pressing cylinder along the longitudinal direction of the doctor when removing the burrs A device for removing burrs of a doctor.