DE102007051275A1 - Impression cylinder for use in e.g. newspaper printing press, has two radial clamping systems arranged close to barrel ends of cylinder for fastening printing plates and extending partially along circumference of cylinder - Google Patents

Abstract

The cylinder (1) has two radial clamping systems (7) arranged close to barrel ends of the cylinder for fastening printing plates. The clamping systems extend partially along a circumference of the cylinder. An N number of the printing plates are fastened on a barrel length of the cylinder such that 2N number of the clamping systems are arranged, where the N is greater than or equal to 1. The clamping systems include clamping mechanisms for the printing plates, which are electrically and/or magnetically controlled. Independent claims are also included for the following: (1) a transfer cylinder for a web-fed rotary printing press comprising a radial clamping systems (2) a lift for an impression cylinder and a transfer cylinder of a web-fed rotary printing press.

Description

The The invention relates to a forme cylinder, a transfer cylinder of a Web-fed rotary printing press and an elevator for this according to the preamble of claim 1, 7 or 13th

at Web-fed printing presses, in particular for multi-page wide web-fed printing presses, As with 6/2 presses, bending vibrations often occur the rotation body on. These bending vibrations act negative for the printing process.

The bending vibrations are caused on the one hand by the increasing bale length L. Thus, due to the dead weight of the rotary body, a deflection d _max occurs, which is directly proportional to L ³ or L ⁴ . This basic deflection already promotes the susceptibility to vibration of the rotating body. On the other hand, such bending vibrations are excited by the clamping channels, which are mounted for lifts on the rotating bodies. Thus, the blanket plates are mounted on the transfer cylinder and the printing plates on the forme cylinder via the clamping channels. Meet now in the operation of the printing press, the clamping channels of adjacent transfer cylinder and form cylinder to each other, so favored a lower resistance moment of the cylinder in contact a so-called channel beating, which in turn causes the excitation of the unwanted bending vibration (s).

From the DE 100 66 162 B4 already a six-page wide printing unit is known in which the vibration behavior is to be reduced by a specific arrangement of the lifts. In this case, the transfer cylinder on the circumference two offset by 180 ° and extending along the entire length of the ball extending through clamping channels for receiving blankets on. In the longitudinal direction of the transfer cylinder three printing blankets are arranged side by side, wherein the blankets each alternately, ie 0 ° -180 ° -0 ° or 180 ° -0 ° -180 °, are arranged. In this arrangement, the clamping channels but still meet portions of the clamping channels to each other, so that the excitation of unwanted bending vibration (s) by channel hit Although reduced but not completely eliminated. For even wider printing presses, eg 8/2 presses, which carry 8 printed pages at the bale length and 2 at the bale circumference of the forme cylinder, the staggered arrangement of the chip channels will no longer be sufficient to prevent the excitation of bending vibrations.

Of the The inventor has therefore set itself the task of channel striking improve conditional excitation of bending vibrations or completely to avoid.

These Task is by a form cylinder and a transfer cylinder a web-fed rotary printing press and a lift for these according to claims 1, 7 and 13 solved.

Of the Inventor has realized that it is possible on the parallel to the cylinder axis of rotation arranged clamping systems that at the Mantle surface Impurities in the form of chip channels training or minigags, to renounce.

Out the discoveries won out beats the inventor before, a forme cylinder of a web-fed rotary printing press on the at least one pressure plate is attachable to improve to that the forme cylinder ends at least two near the forme cylinder bales arranged radial clamping systems for securing the pressure plate having.

By The radial clamping systems are the previously in the contact area or Nippbereich line-shaped disturbing Span channels avoided. When two adjoining Forming and transfer cylinder thus results in the contact area the cylinder is a punctiform defect, the least or not bending vibrations can stimulate through channel joints.

In a possible embodiment extend the radial clamping systems at least partially along the circumference of the Form cylinder. This can be beneficial if s.den lateral areas of the elevator start and elevator end the radial Attacking chip systems. It is also possible that the radial Clamping systems extend around the entire circumference of the forme cylinder.

In usually are in newspaper printing machines where single plates be changed, several pressure plates at the bale length arranged. Are n pressure plates on the ball length of the forme cylinder attached, where n ≥ 1 and integer, can arranged in an embodiment 2n radial clamping systems be. The right and left side of the lift available lateral mounting options are each fastened in a separate radial clamping system. At 8 or 10 printing plates at the bale length are so 16 or 20 radial clamping systems available.

In an alternative embodiment, n printing plates are mounted on the bale length of the forme cylinder, where n ≥ 1 and n are integer, and there are n + 1 radial clamping systems arranged. This version looks in front of the neighboring elevators Fix clamping system.

At It should be noted that the radial clamping systems Also suitable are several elevators along the Cylinder circumference to arrange.

The radial clamping systems have in addition to the known mechanical Clamping mechanisms, for example, operated by spring force be, in a preferred embodiment of clamping mechanisms for the printing plates which are electrically and / or magnetically be operated.

alternative or in addition to this, the tensioning mechanisms the radial clamping systems for the pressure plates also hydraulically and / or be pneumatically actuated.

Of Further, the inventor proposes a transfer cylinder a web-fed rotary printing press can be mounted on the blanket plates are to improve to the effect that the transfer cylinder at least two near the transfer cylinder bale ends arranged radial clamping systems for securing the blanket plates having.

By the radial clamping systems in transfer cylinders the previously in the contact area or Nippbereich linear trained annoying clamping channels avoided. For two adjacent transmission and satellite cylinders (Satellite printing unit) or two transfer cylinders (Rubber-rubber printing unit) thus results in the contact area of Cylinder a punctiform defect, the slightest or no bending vibrations can stimulate through channel joints.

Of the Structure of the transfer cylinder with radial clamping system is similar to that of the forme cylinder with radial clamping system, however, the transfer cylinder is optimized for blanket plates (metal back blanket) or pure blankets.

Farther the inventor proposes a lift for one Form cylinder or a transfer cylinder of a web press, in that the elevator has lateral bends, with those on the forme cylinder or transfer cylinder is fastened, wherein the lateral folds in the direction of rotation extend the forme cylinder or transfer cylinder.

Of the Elevator can in one embodiment on the side area at the elevator start and at the end of the elevator each have a lateral fold. It is also possible that several lateral folds along the elevator length are arranged, with the lateral Bends are spaced apart. A continuous side Bending, as in the previous "leading" and "trailing" Plate edges do not appear to be favorable as the elevator is applied to the round cylinder cross-section and the lateral (s) Bend (s) must follow this rounding accordingly.

Around in addition to the non-positive and a form-fitting To allow attachment of the new elevator, have the lateral folds in a particular embodiment recesses, z. b. Holes, in which the clamping mechanisms of the forme cylinder or the transfer cylinder can intervene. As a rule, the lateral bends are rectangular or square tabs may be formed.

preferred Further developments of the invention will become apparent from the following Description. Various embodiments of the invention are without being limited thereto, with reference to the drawings explained in more detail. Showing:

1 : Perspective view of a forme cylinder;

2 : Perspective view of a lift;

3 : Perspective view of a new form cylinder;

4 : Perspective view on a new elevator.

Hereinafter, the present invention will be described with reference to FIGS 1 to 4 described.

The 1 shows a perspective view of a known form cylinder 1 as used in commercial offset or newspaper offset presses. On this form cylinder 1 be attached to the bale either one or more printing plates side by side. At the circumference of the forme cylinder 1 Likewise, either only one or more printing plates can be clamped one behind the other. The form cylinder shown here 1 has a tensioning device extending almost along the entire length of the bale 2 on. This tensioning device 2 usually consists of a mechanical clamping mechanism which extends in a channel below the cylinder surface of the form cylinder. Only the few millimeters wide chucking channel or "minigag" can be seen on the cylinder surface of the moulding cylinder surface.Above the chucking channel, the folds of the pressure plate (s), which are also marked with "leading plate ducts", are visible te "and" trailing plate edge "are called, introduced and mechanically clamped. As mentioned at the beginning, when the clamping channels of adjacent transfer cylinders and forme cylinders or satellite cylinders meet during operation of the printing press, a lower resistance moment of the contacting cylinders favors a so-called channel beating, which in turn causes the unwanted bending vibration (s) to be excited. The reduction of the minigags to about 3 mm and also the staggered or gestakerte arrangement of the clamping channels, mainly at the transfer cylinder, reduces the channel striking only, but does not eliminate it.

The 2 shows a perspective view of an elevator 3 who is here as a printing plate 3 is designed for a forme cylinder of an offset printing machine.

Of the Construction as a blanket plate is similar. On a metal carrier a blanket is attached and the bevelled metal ends become clamped on a transfer cylinder.

The printing plate 3 out 2 usually consists of a few tenths of a millimeter thick aluminum plate, which carries the printed image, which is transferred to an adjacent rubber or blanket cylinder in the offset. The printing plate 3 has for attachment to a form cylinder a leading edge plate 4 and a trailing plate edge 5 on.

The 3 shows a form cylinder 1 in perspective view. This form cylinder 1 has for clamping a pressure plate two radially extending clamping devices 7 on, which are located near the bale ends. The trained pressure plate 3 is in 4 shown. This printing plate 3 has no leading and trailing edges, but has lateral folds 8th , These lateral folds 8th can non-positively or positively locked in the radial clamping device 7 be attached. The lateral fold 8.1 For example, has constrictions along the folded angle, with which this can be secured, for example, form-fitting manner with a clamping mechanism on the forme cylinder. The lateral fold 8.2 has a hole in which the clamping mechanism can engage positively. In the 1 to 4 shows the arrow 6 either the direction of rotation of the cylinder or the direction of movement of the printing plate 3 at.

Of course, the radial clamping device 7 not necessarily extend over the entire bale circumference. So it is conceivable that this extends only in sections on the circumference. Furthermore, it is conceivable that a plurality of such tensioning devices 7 on the bale of the forme cylinder 1 extend. For example, in a six-page newspaper press carrying six platens at the bale length of the forme cylinder, twelve fixtures may be used 7 be arranged. Here then the right and left lateral folds 8th each in its own radial clamping device 7 attached. In adjacent printing plates, it is also conceivable, the adjacent lateral folds 8th to fix in a common radial clamping device. If there were two pressure plates in the bale length then three radial tensioning devices would be present.

The new forming and transfer cylinder and the new elevator are equally suitable for newspaper printing machines as well as commercial printing machines.

1

form cylinder

2

jig

3

Elevator / printing plate

4

leading end platemark

5

trailing platemark

6

movement direction

7

radial jig

8th

lateral fold

8.1

lateral fold

8.2

lateral fold

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10066162 B4 [0004]

Claims (16)

Form cylinder ( 1 ) a web-fed rotary printing press on the at least one printing plate ( 3 ) is fastened, characterized in that the forme cylinder ( 1 ) at least two radial clamping systems arranged close to the forme cylinder ends ( 7 ) for attaching the printing plate ( 3 ) having. Form cylinder ( 1 ) according to claim 1, characterized in that the radial clamping systems ( 7 ) at least partially along the circumference of the forme cylinder ( 1 ). Form cylinder ( 1 ) according to claim 1 or 2, characterized in that n printing plates ( 3 ) on the ball length of the forme cylinder ( 1 ), where n ≥ 1, and 2 n radial clamping systems ( 7 ) are arranged. Form cylinder ( 1 ) according to claim 1 or 2, characterized in that n printing plates ( 3 ) on the ball length of the forme cylinder ( 1 ), where n ≥ 1, and n + 1 radial clamping systems ( 7 ) are arranged. Form cylinder ( 1 ) according to one of claims 1 to 4, characterized in that the radial clamping systems ( 7 ) Clamping mechanisms for the printing plates ( 3 ), which are electrically and / or magnetically actuated. Form cylinder ( 1 ) according to one of claims 1 to 5, characterized in that the radial clamping systems ( 7 ) Clamping mechanisms for the printing plates ( 3 ), which are hydraulically and / or pneumatically actuated. Transfer cylinder of a web-fed rotary printing press on the at least one blanket plate or a blanket is fastened, characterized in that the transfer cylinder at least two arranged near the transfer cylinder barrel ends radial clamping systems ( 7 ) for fixing the blanket plate or the blanket. Transfer cylinder according to claim 7, characterized in that the radial clamping systems ( 7 ) extend at least partially along the circumference of the transfer cylinder. Transfer cylinder according to claim 7 or 8, characterized in that n blanket plates on the bale length of the transfer cylinder can be fastened, where n ≥ 1, and 2 n radial clamping systems ( 7 ) are arranged. Transfer cylinder according to claim 7 or 8, characterized in that n blanket plates on the bale length of the transfer cylinder can be fastened, wherein n ≥ 1, and n + 1 radial clamping systems ( 7 ) are arranged. Transfer cylinder according to one of claims 7 to 10, characterized in that the radial clamping systems ( 7 ) Have clamping mechanisms for the blanket plates, which are electrically and / or magnetically actuated. Transfer cylinder according to one of claims 7 to 11, characterized in that the radial clamping systems ( 7 ) Have clamping mechanisms for the blanket plates, which are hydraulically and / or pneumatically actuated. Elevator ( 3 ) for a forme cylinder ( 1 ) or a transfer cylinder of a web-fed printing press, characterized in that the elevator ( 3 ) lateral folds ( 8th ), with which this on the forme cylinder ( 1 ) or the transfer cylinder can be fastened, wherein the lateral folds ( 8th ) in the direction of rotation ( 6 ) of the form cylinder bale ( 1 ) or the transfer cylinder bale. Elevator ( 3 ) according to claim 13, characterized in that a plurality of lateral folds ( 8th ) are arranged along the length of the elevator, wherein the lateral folds ( 8th ) are spaced from each other. Elevator ( 3 ) according to one of claims 13 or 14, characterized in that the lateral folds ( 8th ) Have recesses in the clamping mechanisms of the forme cylinder ( 1 ) or the transfer cylinder can intervene. Elevator ( 3 ) according to one of claims 13 to 15, characterized in that the lateral folds ( 8th ) to the main surface of the elevator have a Abkantwinkel between 45 degrees and 135 degrees.