JPH08183153A - Gravure printing plate cylinder - Google Patents

Abstract

PURPOSE: To prevent left ink generated at both ends of a plate cylinder by reciprocating swing operation in a printing width direction (X-direction) of a doctor blade in gravure rotary printing from staining a printer body, from causing mechanical troubles, or from staining a printing sheet S. CONSTITUTION: Mutually opposed flange parts 2, 2 of larger diameter than a cylinder diameter of a cylinder 1 are equipped to both end parts in a rotary shaft direction of a gravure plate cylinder 1. An ink introducing groove hole part 3 having an inner surface continuously flush therewith along a peripheral surface 1b of the cylinder is equipped to an opposed inner surface side of the flange part. An ink discharging hole 5 interconnected to the groove hole part is equipped to an outer surface side flange part. They are respectively equipped with an ink trap cover 7 trapping ink by covering the flange part from outside a rotary circle of the flange part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a gravure printing plate cylinder used in rotary gravure printing, and after gravure printing ink is supplied to the surface of the printing plate cylinder, it is doctored by a doctor blade or the like to form a plate cylinder. The present invention relates to a gravure printing plate cylinder in which residual ink collected at both ends is prevented from scattering outside a rotating circle by a rotating centrifugal force.

[0002]

2. Description of the Related Art A conventional gravure printing cylinder used for gravure rotary printing is shown in a front view of FIG.
Gravure plate cylinder 1 which is rotatably supported by the rotating shaft 1a and is driven to rotate by a gear or the like, and is immersed in the gravure printing ink a in the gravure printing ink tank 51 to rotate synchronously with the gravure plate cylinder 1 to form a gravure plate cylinder. A furnisher roll 11 (a gravure printing ink supply roll) made of rubber or the like for supplying ink by contacting the lower peripheral surface 1b of 1;
A press roll 21 facing the upper peripheral surface 1b of the printing plate cylinder 1 and rotating in synchronization with the gravure plate cylinder 1 is provided, and a backup roll (not shown) is provided on the upper peripheral surface of the press roll 21 as necessary. I have it.

As shown in FIG. 4 (b), an ink cell 1c having a print image area width I is formed on the peripheral surface 1b of the rotating plate cylinder 1, and the gravure attached to the peripheral surface of the furnisher roll 11 is used. The printing ink a is supplied to the peripheral surface 1b of the plate cylinder 1, the ink a is supplied into the ink cells 1c of the plate cylinder 1, and the doctor blade 41 slidingly contacting the peripheral surface 1b is the printing plate cylinder 1 The excess ink a1 supplied to the peripheral surface 1b is scraped off and collected in the ink tank 51.

The doctor blade 41 is shown in FIG.
As shown in FIG. 4, while slidingly contacting the peripheral surface 1b of the plate cylinder 1, it reciprocally swings in the printing width direction (X direction) to scrape off the excess ink a1 supplied to the peripheral surface 1b of the plate cylinder 1. As shown in (b), the printing sheet S is introduced between the plate cylinder 1 and the press roll 21, and the ink a supplied in the ink cell 1c of the rotating plate cylinder 1 is transferred to the press roll. The gravure printing is performed by pressingly transferring to the printing sheet S side by 21.

[0005]

In the conventional rotogravure rotary printing described above, as shown in FIG. 4 (a), the doctor blade 41, which is in sliding contact with the rotating plate cylinder 1 during the printing operation, is Since it reciprocally swings in the (X direction), a residual ink a2 that cannot scrape off the excess ink a1 is generated at both ends of the plate cylinder 1 in the direction of the rotating shaft 1a. Due to the centrifugal force caused by rotation, the ink easily scatters out of the circle of rotation, which may stain the printer body or cause machine failure, or the ink that has scattered and solidified on the printer may peel off and become dust. If the blade may be attached to the doctor blade 41 or the plate cylinder 1 and damage the blade edge of the doctor blade 41 that is in sliding contact with the doctor blade 41, or stain the printing sheet S in some cases. There was.

An object of the present invention is that, in gravure rotary printing, the residual ink generated at both ends of the plate cylinder due to the reciprocal swinging motion of the doctor blade 41 in the printing width direction stains the printer body or causes mechanical failure. This is to prevent the occurrence of the above-mentioned problem and the stain of the printing sheet S.

[0007]

According to the present invention, flanges 2 and 2 having a diameter larger than the cylinder diameter of the cylinder 1 are provided at both ends of the gravure plate cylinder 1 in the rotation axis direction.
Is provided on the inner surface side of the flange portions 2 and 2 facing each other, and the ink introduction groove hole portion 3 having a continuous inner surface along the peripheral surface 1b of the cylinder 1 is provided, and on the outer surface side of the flange portions 2 and 2. ,
Ink discharge holes 5 communicating with the groove portions 3 are provided, and the flange portions 2 are arranged from outside the rotation circle of the flange portions 2, respectively.
It is a gravure printing plate cylinder characterized by comprising an ink collecting cover 7 for covering and collecting ink.

[0008]

EXAMPLE A gravure printing plate cylinder of the present invention will be described in detail in accordance with an example shown in the LL front sectional view of FIG. 1 (a) and the side view of FIG. 1 (b).

As shown in FIG. 1 (a), in a plate cylinder 1 which is rotatably supported by a rotary shaft 1a, is supported by a main frame of a printing machine, and is driven and rotated by a gear or the like, the rotary shaft 1
At both ends of the plate cylinder 1 in the a direction, a diameter larger than the cylinder diameter of the cylinder 1 (for example, a diameter of 10 mm to 2 mm
The flange portions 2 and 2 of 0 mm or 20 mm to 40 mm in diameter) are provided to face each other. In the present invention, the diameter difference value between the plate cylinder 1 and the flange portion 2 is not particularly limited as long as it does not depart from the gist of the present invention.

The flanges 2 and 2 are the plate cylinder 1
Are integrally provided at both ends of the plate cylinder 1, and are attached and fixed to both ends of the plate cylinder 1 by screw fixing portions 6 as shown in the figure.

The rotary shaft 1a of the plate cylinder 1 may be formed integrally with the flange portion 2,
Alternatively, it may be extended from both ends of the plate cylinder 1 body to both sides.

Each of the flange portions 2 is provided with an ink introduction groove hole portion 3 having an inner surface which is continuous with the peripheral surface 1b of the cylinder 1 on the inner surface sides which face each other, and each of which is provided on the outer surface side of the flange portion 2. Includes an ink discharge hole 5 that communicates with the groove portion 3 through a communication passage having an appropriate diameter.

Either one of the ink introduction groove portion 3 and the discharge hole 5 is formed in a continuous ring shape along the peripheral surface 1b, and the other is intermittently formed in an interrupted ring shape along the peripheral surface 1b. You may form. Further, for example, as shown in FIG. 1B, both of the ink introduction groove hole portion 3 and the discharge hole 5 are
It may be intermittently formed in the shape of an interrupted ring along the peripheral surface 1b.

As an embodiment of the present invention, FIG.
As shown in (a), if necessary, the slot 3
An internal space portion 4 having a larger diameter than each of the groove portion 3 and the discharge hole 5 may be provided between the ink discharge hole 5 and the ink discharge hole 5.

The gravure printing plate cylinder of the present invention is driven and rotated by a gear or the like attached to the rotary shaft 1a during printing, as in the conventional example.
As shown in (b), a doctor blade 41, which reciprocally swings in the printing width direction, slides on the peripheral surface 1b of the plate cylinder 1 to scrape off the excess ink a1 supplied to the peripheral surface 1b. .

In the gravure printing plate cylinder A of the present invention, during the printing operation, the surplus ink a on the peripheral surface of the plate cylinder 1 is moved by the doctor blade 41 that reciprocally swings.
In this case, the residual ink a2 (see FIG. 4) is generated at both ends of the plate cylinder 1 when the excess ink a1 is scraped off, as in the conventional example.

The doctor blade 4 which reciprocally swings.
The residual ink a2 generated when the surplus ink a1 of the plate cylinder 1 is scraped by means of 1 is due to the self-adhesive force of the residual ink a2 to the peripheral surface 1b of the plate cylinder 1 and the adhesive force of the rotating plate cylinder 1. At the same time as the rotational centrifugal force acts in the opposite direction, the vector force (kinetic energy) toward both ends of the plate cylinder 1 due to the reciprocating swing acceleration of the doctor blade 41 in the printing width direction.
Is what works.

Therefore, the residual ink a flows along the peripheral surface of the cylinder 1 toward both ends of the plate cylinder 1, and the flange portions 2 and 2 provided at the both ends of the plate cylinder 1 respectively.
The ink is introduced into the ink introduction groove 3 of the above, and then is discharged from the ink discharge hole 5 to the outside of the rotation circle of the printing plate cylinder by the rotational centrifugal force of the printing plate cylinder.

The gravure printing plate cylinder A of the present invention has an ink collecting cover 7 which covers the flange portions 2 and 2 at both ends of the printing plate cylinder from the outside of the rotation circle of the flange portions 2 and 2, respectively. Be prepared.

The ink collecting cover 7 collects the residual ink a2 discharged outward by the centrifugal force from the ink discharge hole 5, and collects the residual ink a2. The structure of the ink collecting cover 7 and the method of collecting the uncollected ink a2 by the ink collecting cover 7 are not particularly limited in the present invention.

The gravure printing plate cylinder A of the present invention is shown in FIG.
A furnisher roll 11 made of rubber or the like for supplying a gravure printing ink rotating in contact with the gravure printing plate cylinder A to a lower peripheral surface 1b of the plate cylinder 1 of the plate cylinder A shown in FIGS. And a press roll 2 facing the upper peripheral surface 1b of the plate cylinder 1 and rotating in synchronization with the plate cylinder 1.
1 is provided with a doctor blade 41 that is in sliding contact with the peripheral surface 1b of the plate cylinder 1, and if necessary, a backup roll (not shown) is arranged on the upper peripheral surface of the press roll 21 to rotate the gravure roller. It is used as a printing machine.

The gravure printing plate cylinder A of the present invention is shown in FIG.
As shown in a front view showing an example of the gravure rotary printing machine and a side view showing an example of the gravure rotary printing machine in FIG. 3, the gravure printing machine main body frame F is pivotally supported by the rotary shaft 1a and a gear or the like is interposed therebetween. Gravure cylinder 1 driven and rotated
And immersing in the gravure printing ink a in the gravure printing ink tank 51 and rotating synchronously with the gravure plate cylinder 1.
A furnisher roll 11 made of rubber or the like that contacts the lower peripheral surface 1b of the gravure plate cylinder 1 to supply ink, and a press roll that faces the upper peripheral surface 1b of the printing plate cylinder 1 and rotates in synchronization with the gravure plate cylinder 1. 21 are rotatably supported and, if necessary, the press roll 21
A backup roll 31 (rotating shaft 31a) is provided on the upper peripheral surface.

Further, similarly to the conventional example (shown in FIG. 4B), the peripheral surface 1 of the rotating plate cylinder 1 shown in FIGS.
In b, an ink cell 1c is made in a print image area width I, and the gravure printing ink a adhering to the peripheral surface of the furnisher roll 11 is supplied to the peripheral surface 1b of the plate cylinder 1 so that the plate cylinder 1 The doctor blade 41, which supplies the ink a into the ink cell 1c and slides against the peripheral surface 1b, scrapes the excess ink a1 supplied to the peripheral surface 1b of the printing plate cylinder 1 into the ink tank 51. .

As shown in FIG. 2, the doctor blade 41 makes a reciprocating rocking motion in the printing width direction (X direction) while slidingly contacting the peripheral surface 1b of the plate cylinder 1 to make the plate cylinder 1
The excess ink a1 supplied to the peripheral surface 1b is scraped off,
As shown in FIG.
Ink a supplied into the ink cell 1c of the rotating plate cylinder 1 by introducing the printing sheet S between
Is press-transferred to the printing sheet S side by the press roll 21 to perform gravure printing.

The gravure printing plate cylinder A of the present invention used in the gravure printing machine is characterized in that the residual ink a2 generated when the surplus ink a1 of the plate cylinder 1 is scraped off by the doctor blade 41 which reciprocally swings. It flows in the direction of both ends of the plate cylinder 1 along the circumferential surface of the cylinder 1 and is introduced into the ink introduction groove holes 3 of the flanges 2 and 2 provided at both ends of the plate cylinder 1, and then the printing plate cylinder rotates. The residual ink a2, which is scattered and discharged from the ink discharge hole 5 to the outside of the rotation circle of the printing plate cylinder by centrifugal force and scattered and discharged to the outside from the ink discharge hole 5 by centrifugal force, is collected by the ink collecting cover 7. To be done. As shown in FIG. 2, the ink collecting cover 7 installed at both ends of the printing plate cylinder A is composed of an upper plate part 7d, an outer plate part 7e, a bottom plate part 7f, and both side plate parts 7g, 7g. The cover 7 has an opening on the side opposite to the flange portion 2, and the flange portion 2 is fitted in the opening portion. The residual ink a2 scattered and discharged outward from the ink discharge hole 5 by centrifugal force is inserted into the rotary shaft 1a of the plate cylinder 1 with the cover mounting hole 7c formed in the outer plate portion 7e, and the gravure printing machine is used. The ink is collected in the inside 7a of the ink collecting cover 7 mounted and fixed to the body frame F side, and is collected by the ink collecting pipe 7b provided in the lower part of the ink collecting cover 7.

[0026]

The gravure printing plate cylinder A of the present invention comprises the gravure plate cylinder 1 having, at both ends in the rotation axis direction, flange portions 2 and 2 having a diameter larger than the cylinder diameter of the cylinder 1 and facing each other.
Is provided on the inner surface side of the flange portions 2 and 2 facing each other, and the ink introduction groove hole portion 3 having a continuous inner surface along the peripheral surface 1b of the cylinder 1 is provided, and on the outer surface side of the flange portions 2 and 2. ,
Since the ink discharge hole 5 communicating with the groove portion 3 is provided,
Sliding contact with the peripheral surface of the plate cylinder 1 in the print width direction (X direction)
The remaining ink a2 generated when the excess ink a1 on the plate cylinder 1 is scraped off by the doctor blade 41 that reciprocally swings toward and away from the plate cylinder 1 flows along the circumferential surface of the cylinder 1 toward both ends of the plate cylinder 1, 1 The ink is introduced into the ink introduction groove holes 3 of the flanges 2 and 2 provided at both ends, and then discharged from the ink discharge holes 5 to the outside of the rotation circle of the printing plate cylinder by the centrifugal force of rotation of the printing plate cylinder. The residual ink a2 discharged from the ink discharge hole 5 can be collected and collected by the ink collecting cover 7 installed so as to cover the flanges 2 and 2 from the outside of the rotating circle.

[0027]

EFFECTS OF THE INVENTION The gravure printing plate cylinder of the present invention can collect and collect the residual ink generated at both ends of the plate cylinder without scattering outside the rotating circle of the both ends of the printing plate cylinder. In rotary printing, it is possible to eliminate unprinted ink at both ends of the printing plate cylinder that occurs due to the reciprocal swinging motion of the doctor blade in the printing width direction, and the cause of mechanical failure such as stains on the printer body and damage to the doctor blade,
This has an effect of preventing stains on the printing sheet.

[Brief description of drawings]

1A is a front sectional view showing an embodiment of a gravure printing plate cylinder of the present invention, and FIG. 1B is a side view showing an embodiment of a gravure printing plate cylinder of the present invention.

FIG. 2 is a front partial sectional view showing an example of a gravure printing machine using the gravure printing plate cylinder of the present invention.

FIG. 3 is a side view showing an example of a gravure printing machine using the gravure printing plate cylinder of the present invention.

FIG. 4A is a front view showing a conventional gravure printing plate cylinder, and FIG. 4B is a side view showing a conventional gravure printing plate cylinder.

[Explanation of symbols]

F: Gravure printing machine body frame S: Printing sheet
A ... Gravure printing plate cylinder a ... Gravure printing ink a1 ... Excess ink a2 ... Leftover ink X ... Printing width direction 1 ... Gravure plate cylinder 1a ... Rotating shaft 1b ... Cylinder peripheral surface 1c ... Ink cell 2 ... Flange part 3 ... Ink introduction groove Hole 4 ... Internal space 5 ... Ink discharge hole 5a ... Ring-shaped groove 6 ... Screw stop 7 ... Ink collection cover 7a ... Inside cover 7b ... Ink collection tube 7c ... Fit insertion hole 11 ... Furnisher roll 21 ... Press roll 31 ... Backup roll 41 ... Doctor blade
51 ... Ink tank

Claims (1)

[Claims] 1. Gravure plate cylinder 1 is provided with flange portions 2 and 2 having a diameter larger than the cylinder diameter of said cylinder 1 at both ends in the direction of rotation axis, and said flange portions 2 and 2 are provided.
Is provided with an ink introduction groove hole portion 3 having a continuous inner surface along the peripheral surface 1b of the cylinder 1, and communicates with the groove hole portion 3 on the outer surface side of the flange portions 2 and 2. A gravure printing cylinder comprising an ink discharge hole (5) and an ink collecting cover (7) for covering the flange portion (2) from the outside of the rotation circle of the flange portion (2) to collect ink.