JP2829507B2 - Doctor fixing device for gravure printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for fixing a doctor for scraping ink adhered to an outer periphery of a plate cylinder in a gravure printing machine.

[0002]

2. Description of the Related Art In a gravure printing press, a doctor makes the length of a plate cylinder slightly shorter than a length of a plate cylinder. If you replace it with a different one, the doctor will also need to replace it with a different one.

Conventionally, the doctor has to be replaced together with the fixing device. In order to fix the doctor to the fixing device, the doctor is pressed against the doctor fixing surface with several screws screwed into a holding plate. However, since the doctor is a thin plate with a thickness of about 0.15 mm, depending on how the screws are tightened, the doctor bends and fixes it like a wave, making it difficult to make uniform contact with the plate cylinder. Was.

[0004] For this reason, there is a drawback that the doctor must be carefully fixed by the skilled worker, and it takes a long time to change the setup.

[0005]

The problem to be solved by the present invention is that it takes a long time to replace a doctor with a conventional fixing device.

[0006]

Means for Solving the Problems, Functions and Effects As a means for solving the above-mentioned problems, the invention of claim 1 is to form a doctor fixing surface on the upper surface of the front end portion and to provide a doctor on the deep end of the doctor fixing surface. A fixed base that forms an abutment step, forms a long groove almost parallel to the length direction of the doctor on the upper surface of the center, and forms an inward slope on the front edge of the upper surface of the center, and a doctor on the lower surface of the front end A holding plate that forms a holding surface for holding the doctor on the fixed surface, and a wedge-shaped projection that corresponds to the slope on the back side of the holding surface, and an eccentric position of the lower end surface that is freely rotatably supported by the holding plate And a camshaft with a pin protruding into the long groove almost in a close-fitting manner.The doctor blade is placed on the doctor fixing surface, and the rear end of the blade is applied to the abutting step. Parallel to Then, when the camshaft is rotated, the pin rotates eccentrically in the long groove and the holding plate recedes, so that the wedge-shaped projection engages with the inward slope and the holding plate falls, and the doctor holds the doctor on the holding surface. Since the doctor can be pressed against the fixing surface and fixed, there is an effect that even an unskilled person can fix the doctor firmly without wavering in a short time, and the invention of claim 2 is based on the invention of claim 1. The support rod is inserted into the block located behind the holding plate, and the tip of the supporting rod is screwed to the back of the holding plate, and the compression coil is inserted between the rear surface of the holding plate and the block around the supporting rod. A spring is mounted, and the block is pivotally supported by a bracket erected at the rear of the fixed base. Therefore, the holding plate can be opened and closed by swinging about the axis with respect to the fixed base. There is an effect that it is possible to easily doctor detachable while fitted with over fixation device to the printing machine body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a doctor fixing device according to the present invention, which removes ink a attached to a plate cylinder c immersed in ink a in an ink pan b with a doctor 2, and forms a recess in the plate cylinder c. The ink a remaining on the plate cylinder 2 is moved by the impression cylinder d.
Is transferred to the sheet e pressed against the printing press, and the doctor fixing device is attached to the mounting shaft 3 inserted into the main body of the printing press by the use position indicated by a solid line in the figure and the chain line in the figure. It is fixed to the doctor replacement position shown.

As shown in FIG. 3, the doctor fixing device 1 comprises a fixing table 4 and a pressing plate 5, and the fixing table 4 has a doctor fixing surface 6 which is slightly downwardly inclined on the upper surface of its front end. Abutment step 8 at the back end through escape groove 7
Are formed, and two long grooves 10 parallel to the length direction of the doctor fixing surface 6 are formed on the central upper surface 9 at intervals in the longitudinal direction. An inclined surface 16 is formed, and two pairs of brackets 11, 1 are provided on both sides in the longitudinal direction of the rear end of the fixed base 4.
1, a long coaxial through-hole 12 is formed in the upper part thereof, a long plate 13 is extended in one of the brackets 11, and a stopper bolt 14 is screwed in the upper part thereof, and a lock nut 15 is used. The screwing amount is fixed so as to be adjustable.

A thick steel plate 1 is provided on the lower surface of the front end of the holding plate 5.
7 is fixed slightly downward, the lower surface of which is a pressing surface 18 which is in close contact with the doctor fixing surface 6 of the fixing base 4, and a wedge-shaped projection 19 corresponding to the slope 16 of the fixing base 4 is provided on the rear side. Are formed on both sides of the central portion of the holding plate 5 in the longitudinal direction, as shown in FIGS.
The camshaft 2 is provided with a pin 21 which is rotatably supported at its lower end face and which fits tightly into the long groove 10 of the fixing base 4 at an eccentric position of the lower end face.
An auxiliary body 24 having holes 25 on both sides of a main body 23 is fixed with screws 26 on both sides in the longitudinal direction of the rear edge of the holding plate 5. A support rod 29 passed through a center hole 28 of the block 27 is screwed into a screw hole 31 formed on the rear surface of the holding plate 5 via a compression coil spring 30, and the block 27 is attached to the bracket 11 of the fixing base 4. The shafts 32, 32 inserted between the holes and inserted into the through holes 12 are fitted into the holes 25, so that the holding plate 5 is formed on the fixed base 4 with the shaft 32 as a center, and can be freely opened and closed. It is mounted to be able to retreat against the elasticity of 30.

When the doctor 2 is to be replaced, the doctor fixing device 1 is rotated by 90 ° to a doctor replacement position shown by a chain line in FIG.

At this time, as shown in FIG. 4, the doctor 2 comes into close contact with the doctor fixing surface 6, the rear end of the doctor 2 contacts the abutting step 8, and the pin 21 of the cam shaft 20 is located on the front side of the cam shaft 20. The plate 5 retreats with respect to the fixed base 4 and the projection 1
9 presses under the slope 16 to press the holding surface 1 of the holding plate 5.
At 8, the doctor 2 is pressed against the doctor fixing surface 6 and fixed, and the compression coil spring 30 is slightly compressed by the retraction of the pressing plate 5.

Next, the camshaft 2 is operated by operating the handle 22.
0 is rotated by about 90 °, and as shown in FIG.
When the pin 21 inserted into the camshaft 20 is substantially at the center of the camshaft 20,
Since the holding plate 5 moves forward and the projection 19 comes off the slope 16, the holding plate 5 rises from the fixed base 4, and the holding surface 1
8, the pressing force of the doctor 2 against the doctor fixing surface 6 is released.

For this reason, the holding plate 5 with the shaft 32 as the center
5 and 6, the doctor 2 can be easily removed from the doctor fixing surface 6 by falling backward and hitting against the stopper bolt 14. As shown in FIG.

When a new doctor 2 is to be mounted, the doctor plate 2 is brought into contact with the abutment step 8 in the position shown by the chain line in FIGS.
As shown by the solid line in the figure, the doctor plate 2 is raised and the doctor 2 is pressed by the pressing surface 18, and the cam shaft 20 is rotated by about 90 ° by operating the handle 22, and the state of FIG. The doctor fixing device 1 is fixed to the fixing table 4 by being pressed against the fixing table 4 by the pressing plate 5 as shown in FIG.
Return to the position shown by the solid line and fix it.

[Brief description of the drawings]

FIG. 1 is a side view showing a use state of an embodiment of the present invention.

FIG. 2 is a perspective view of one embodiment of the present invention.

FIG. 3 is an exploded perspective view of a part thereof.

FIG. 4 is a sectional view showing a state in which a doctor is tightened.

FIG. 5 is a cross-sectional view showing a state in which a doctor is released from tightening.

FIG. 6 is a partial side view showing the opening and closing movement of the holding plate.

[Explanation of symbols]

 1: doctor fixing device 2: doctor 4: fixing base 5: holding plate 6: doctor fixing surface 8: abutting step 9: upper surface of central portion 10: long hole 11: bracket 16: slope 18: holding surface 19: projection 20 ： Cam shaft 21 ： Pin 27 ： Block 29 ： Support rod 30 ： Compression coil spring

Claims (2)

(57) [Claims] 1. A doctor fixing surface is formed on a front end upper surface, a doctor abutment step is formed on a rear end of the doctor fixing surface, and a long groove substantially parallel to a doctor length direction is formed on a central upper surface. A fixed base having an inward slope formed on the front edge of the upper surface of the central portion, and a pressing surface for holding the doctor on the doctor fixing surface formed on the lower surface of the front end portion, and the slope on the rear side of the pressing surface. Gravure printing comprising: a holding plate having a corresponding wedge-shaped projection formed thereon; and a cam shaft having a pin rotatably supported by the holding plate and fitted at the eccentric position of the lower end face to fit approximately tightly into the long groove. Machine doctor fixing device. 2. A support bar is inserted through a block disposed behind the holding plate, and a tip end of the supporting bar is screwed to a rear portion of the holding plate, and a rear surface of the holding plate around the holding bar is provided. The doctor fixing device for a gravure printing machine according to claim 1, wherein a compression coil spring is mounted between the block and the block, and the block is pivotally supported by a bracket provided upright at a rear portion of the fixing base.