DE8034630U1 - FORM CYLINDERS FOR ARC ROTATION PRINTING PRINTING MACHINES - Google Patents

Description

The invention relates to a forme cylinder for sheet rotors

tion gravure printing machines with a cylinder channel, i

in the means for securing a flexible pressure plate |

and closing the cylinder channel are provided, wherein f

one end of the pressure plate around the edge of the cylinder- I

channel laid and the other end with a locking piece g

is brought into contact, and tensioning the pressure plate j

^l reasonable by pivoting on a rotatable shaft

arranged closure piece takes place. ;

On gravure printing machines it is common to use the printing color <"

to be fed directly to the printing form or the printing plate and!

remove the excess amount by means of a squeegee device (

loll around. The aim was therefore always to use a printing form f _f ;

to create that, if possible, do not have any joints |

points and yet light and simple on the forme cylinder I.

is to be attached. A pressure |

form is sought because the squeegee is not periodic |

can be turned off by the printing form. |

Devices that meet these requirements are already ^f

has become known from various patents and.

show possibilities to '[

tighten. From US-PS 2,167,621 a device is described

become known, in which the angled ends of the pressure |

plate inserted into a recess of a clamping piece and I

be clamped by pivoting the clamping piece. One ·;

further plate tension is described in DE-PS 454 951 |

ben. In this embodiment, the pressure plate ends are provided with removable strips, which on the cylinder and a closure segment can be fastened. However, these devices have disadvantages, so that they do not are easily used for a sheet-fed rotogravure printing press. As a particularly disadvantageous is Device according to DE-PS 454 951 to be viewed, since additional strips are arranged here at the printing plate ends Need to become.

The disadvantage of the device according to US Pat. No. 2,157,621 is, in particular, that such a configuration Can only be used for cylinders with a narrow channel width, since with a wider channel the pressure plate has a longer distance would not be supported. In addition, the end of the pressure plate that is moved during the tensioning process is not sufficient held securely.

The invention is therefore based on the object of a forme cylinder for a sheet-fed rotogravure printing press, in which a simple, securely actuatable printing plate clamping device is arranged in the cylinder channel and which closes the cylinder channel so that penetration of paint in the cylinder channel is reliably prevented.

Furthermore, the pressure plate should be clamped when the channel is closed.

This object is achieved by the characterizing features according to claim 1.

This configuration has decisive advantages over the known devices.

The plug is immersed radially; so it is possible that only a small part of the printing plate on Cylinder circumference cannot be supported. The clamping of the pressure plate is also relatively easy to implement because this can be done automatically.

In a particular embodiment of the invention, one end of the pressure plate is on the clamping of the pressure plate Start of printing pushed into a terminal strip provided for this purpose and clamped by partially closing the channel. After a partial rotation of the gravure cylinder, the remaining end of the printing plate is then in a clamping piece pushed in and clamped by closing the duct further. At the same time, the pressure plate is now through further closing of the breechblock tensioned.

The invention is explained in more detail below using a sketch using an exemplary embodiment.

Fig. 1 shows a gravure cylinder according to the

Invention in section.

The forme cylinder 1 has a channel 9 which extends over the length of the foil cylinder 1 and in which means for Clamping and tensioning of the pressure plate 7 are arranged. the

lit »·

Clamping and tensioning means are in the channel 9 on a shaft 8 arranged rotatably and fixed in their clamping and tensioning position by means of a toggle lever drive 10, 11. By actuation of the toggle lever drive 10, 11, the clamping and tensioning means can be immersed in the channel 9. When immersed the clamping and tensioning means in the channel 9, the pressure plate 7 is relaxed and released from the clamping means. the Clamping and clamping means are combined into a unit and consist of a locking piece 2 on the Shaft 8 is mounted and can be actuated by the toggle lever drive 10, 11. The locking piece 2 has a semicircular shape formed bearing groove 3, in which the clamping piece is mounted with a correspondingly shaped iNase 15. That Closure piece 2 and clamping piece 4 each have a clamping surface 5 and 6, between which the pressure plate 7 can be clamped is. In order to be able to achieve a higher holding force, the clamping surfaces 5 and 6 can have a roughened surface. The clamping and tensioning of the pressure plate 7 takes place in that the ends of the pressure plate 7 are angled and around the edges 15, 14 of the forme cylinder 1 or of the clamping piece 4 are laid around, with one end of the pressure plate between the clamping surfaces 5 and 6 of clamping piece 4 and locking piece 2 is pushed. The end of the pressure plate 7 that remains at rest when the pressure plate 7 is tensioned is here to a sufficient extent zAvischen the cylinder channel surface 14a and a possibly resilient retaining piece 16 secured. Through the Actuation of the toggle lever drive 10, 11, the locking piece 2 is lifted out of the channel 9 and in the direction of the Edge 14 of the forme cylinder 1 moves. Due to the resulting train, which is caused by the pressure plate 7 on the clamping piece 4 is exercised, the two clamping surfaces 5 and

• I

I I I I III

I I

pressed against each other, the pressure plate 7 arranged between them being clamped. By pressing again of the closure piece 2 in the direction of the edge 14, the pressure plate 7 is then tensioned and, at the same time, the channel 9 locked. The slot B present at the joints between the printing plate ends can be cut through a plastic strip 17 are closed, which can be placed between the printing plate ends by the final closing of the channel 9. The protruding material is then cut off by means of a knife so that the plastic strip 17 with the Pressure plate 7 closes at a height. Since it is common practice in gravure printing to squeegee the printing form, they are Edges 13 and 14 of the clamping piece 4 and of the forme cylinder 1 by a small amount relative to the forme cylinder axis inclined. This makes it possible for the doctor blade, which can be positioned on the forme cylinder 1, to pass the joints the pressure plate cannot jump, thus avoiding paint splashing.

Claims (5)

* 1 till f fl »I ··· ft I ■■■ <t CM *> 1 Il Ii ■ • · 14 l ι t I t ·· · 4931) 9} MI * MAN - ROLAND Druckmaschinen Aktiengesellschaft Christian-Pleß- Straße 6-30, 6050 Offenbach am Main Form ζ yl inder_für_Bog en.ro tat ions - gravure printing machines ■ fti claims 1.) Form cylinder for sheet-fed rotogravure printing machines with a cylinder channel in which means for fastening a flexible pressure plate and closing the cylinder channel are provided, one end of the pressure plate placed around the edge of the cylinder channel and brought the other end into contact with a closure piece is, and the tensioning of the pressure plate by pivoting the locking piece arranged on a rotatable shaft he follows, characterized in that the closure piece (2) has a semicircular shape, has over the length of the locking piece (2) extending bearing groove (3) that in the bearing groove (3) a one-piece clamping piece (4) which extends over the length of the same and which has a clamping surface (5), which at a defined distance (A) with another, on the closure piece (2) provided clamping surface (6), whereby the distance (A) of the corresponding clamping surfaces (5, 6) is slightly less than the thickness (S) of the the pressure plate (7) and that the pivoting movement of the locking piece (2) by a toggle lever drive (10, 11) can be actuated in such a way that the locking piece (2) is locked in a clamping position. 2 ") forme cylinder according to claim 1, characterized in that the corresponding clamping surfaces (5, ö) with are provided with a rough surface. 3.) forme cylinder according to claim 1, characterized in that the clamping piece by the tensioning of the pressure plate (7) (4) about its pivot axis (12) against the clamping surface (6) of the locking piece (2) can be pressed. 4.) forme cylinder according to claim 1 to 3, characterized in that that the edges (13, 14) of the cylinder channel (9) and the clamping piece (4) at an angle of approximately 45 ' are formed obliquely to the cylinder axis. 5.) forme cylinder according to claim 1 to 4, characterized in that that the slot (B) still remaining after tensioning the pressure plate (7) through a plastic strip (15) is lockable.