DE1039539B - Device on printing machines to divert the web from front to back printing - Google Patents

Description

The turning devices known on multi-color rotary printing machines for deflecting the Web from front to back printing are partially set up in such a way that the register is between them Front and back printing can be adjusted. In some of these known facilities simultaneously with the adjustment of the side register, the longitudinal register in a certain ratio to it adjusted. This is undesirable because one of the two registers then has to be corrected again. There the longitudinal register can be easily adjusted by other means between front and back printing, it is sufficient if only the side register is adjustable on the turning device.

In known designs of this type, * 5 occurs in such a way that both the two turning bars, which deflect the path by 90 ° from their direction, as well as the pulley, over which the web runs between the two turning bars, on both sides are stored in guides. All management positions are run by a common auxiliary engine driven, which adjusts the guide bearings via shafts and bevel gears when an adjustment of the Page register is required. As a result, in this design there are six separate guides necessary as well as as many adjusting spindles and an even larger number of shafts and bevel gears, which lead from the auxiliary motor to the various adjustment devices.

Also for deflecting a web in such a way that it changes its original direction of travel by 90 ° changes, turning bars are mostly used, the angular position of which can be adjusted within small limits is. For this purpose, such turning bars are at both ends in handlebars or other Moving parts out and change their angular position when adjusted at one end will. In this way, the deflection of the web can be done exactly to the desired angle, in general 90 °. In the same way, the setting of deflection rollers, the should cause a slight lateral deviation of the web from its original direction of travel. For the Control of the page register within a multicolor printing machine are all these devices therefore not usable because the web is behind the turning bar or the deflection roller depending on them Adjustment changes its direction of travel by an (albeit small) angle, while an exact adjustment of the side register requires a shift of the path parallel to itself.

Such an adjustment is extraordinary according to the invention in connection with a turning device easily achieved in that the device on printing machines

to divert the web
from front to back printing

Applicant:

Maschinenfabrik Goebel GmbH,
Darmstadt, Goebelstr. 21

Dipl.-Ing. Kurt Rathke, Darmstadt,
has been named as the inventor

two turning bars around a common, perpendicular to the plane of the path and the turning bar in their Axis intersecting the center can be pivoted in opposite directions by the same angular dimensions. For this purpose, the two turning bars can each be stored in a bracket, the pivot bearing of which is in the center of the bracket, with the pivot axis being the center of the path in the pivot axes crosses.

The invention is in the drawing, which was brought up and only to explain the invention serves, without deriving a further claim for protection, shown in perspective.

After its front side has been printed in one or more printing units, the paper web 1 runs towards the turning device over the roller 2. For example, the printed front is on top. The web then arrives at the turning bar 3, by means of which it is deflected to the side by 90 °, after which its unprinted back is on top. The web is then returned in the same direction by the deflecting roller 4 and then runs over the turning bar 5, which is at 45 ° to its running direction, by which it is in turn deflected by 90 °. After leaving this bar, the track runs in its original direction again, but the back is turned up. The web then leaves the turning device via a guide roller 6 and runs to the printing units for the rear side.

The two turning bars 3 and 5 are attached to brackets 7 and 8, respectively. Both enter in their midst Bearings 9 and 10, which encompass the axis 11. The two turning bars 3 and 5 are thereby around the common Axis 11 can be swiveled.

If the page register is to be adjusted between front and back printing, the original

«09 639/7

Claims (1)

initially at 45 ° to the running direction of the paper web 1 turning bars about the axis 11 panned. So that the longitudinal register is not affected, it is necessary that the two turning bars be pivoted through the same angle, but opposite to each other. That can be done in happen in any known manner. By pivoting the web on the turning bar 3 is no longer deflected by 90 ° to the side, but by a larger or smaller angle depending on the direction of adjustment, the difference being opposite 90 °, however, is only very small. The thus inclined the guide roller 4 tapered web is to the offset the same angle, returned again and then runs over the turning bar 5, the deflection angle deviates by the same amount from 90 ° as with the deflection around the other turning bar. From this it follows that the path after leaving the turning bar 5 compared to its original position is shifted sideways; however, its center line is parallel to the original center line; the The web also runs straight to the subsequent printing units. Ρλ τ ε χ τ λ χ s ρ r v c η: Device on printing machines for diverting the web from front to back printing by means of two turning bars each deflecting the path by 90 ° from their direction and one the Web by 180 ° leading deflection roller, whereby the side register is maintained when turning the web of the longitudinal register is adjustable, characterized in that the two turning bars (3, 8) around a common, perpendicular to the plane of the path and the turning bars in their Axis intersecting the center can be pivoted in opposite directions by the same angular dimensions are. Considered publications:
British Patent Nos. 304,628, 279,608;
U.S. Patent No. 2,654,599. 2,378,234. 1 sheet of drawings © £ 09 639/7 9.58