DE2058840A1 - Printing unit of a rotogravure printing press - Google Patents

Description

Patent Attorneys 89 Augsburg, November 24, 1970

DR. WERNER KRUSE Deutsche Bank Augsburg 0637827 DR. DIETER LAUER StadtsparkcnseAugsbure0711671 Postal check account ι Munich 1152 86

Fast pressing! "Abrik Frankenthal Albert & Cie AG

6710 Frankenthal

Printing unit of a rotogravure rotary machine

The invention relates to a printing unit with a forme cylinder, an intermediate roller and vertically mounted one above the other Impression cylinder of a rotogravure rotary press. The task of the impression cylinder is to provide the necessary Applying pressure via the intermediate roller to the web of material to be printed running over the forme cylinder. the The necessary contact pressure is exerted on the steering knuckles on both sides of the impression cylinder.

The object of the invention is to reduce the contact pressure of the impression cylinder in adjustable areas of width to let the fabric to be printed come into effect. This can be done for various reasons: ZoBo to compensate for the deflection of the cylinder for the purpose of even printing across the entire width of the web, whereby the degree of deflection is different depending on the height the contact pressure, which depends on the print image by the Contact pressure in the middle of the web width is brought to active use in a wider or narrower area. Another The reason can be a one-sided print image or the printing of half a paper web, which means that the Active use on these parts can appear desirable.

According to the invention, this object is achieved by that the two bearings of the impression cylinder are horizontally adjustable transversely to its longitudinal axis. This makes it possible to interlace the impression cylinder with respect to the intermediate roller. This results in bending of the impression cylinder and the intermediate roller contact each other along a looped line. The intersection point of entanglement can be along a surface line

209824/0339

Shift the two bearings into the desired area of the web width by evenly or differently counter-rotating transverse adjustment of the two bearings. If you want to print evenly across the entire width of the web, the crossing point is shifted to the center of the web width, increasing the pressure in the longitudinal center of the cylinder and reducing it at the two cylinder ends. In the case of lower contact pressure, where the cylinder deflection is less, the angle of twist will be chosen to be lower ₀ This enables uniform printing over the entire width of the web in every pail and with different print images, i.e. with so-called heavy forms as well as with light print images . Adjustment can be made easily and quickly after observing the printed image. Since the degree of possible deflection of the cylinder depends on the cylinder length and on the diameter, the invention can also be used successfully for all these variants in the same way. The technical means to be used for this can be very simple. The steering knuckles of the impression cylinder are preferably carried in ball or roller pendulum bearings by bearing holders that are transversely adjustable in the machine frame side walls. The entanglements, which are kept in very small dimensions, can be incorporated therein.

For universal controllability, the cross-divisibility according to the invention extends to both Sides of the perpendicular projection of the axis lines of the cylinders arranged one above the other and is each of the two bearings independently adjustable. If the web width is always the same, it only comes down to achieving a uniform one Contact pressure over the entire length of the forme cylinder, a common, uniform, counter-rotating adjustability can be achieved of the two bearings of the impression cylinder should be useful, for which purpose the adjustment means on both sides of the bearing be coupled by known means, or known pneumatic, hydraulic. or electrical Adjusting devices are brought into use.

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So that the adjustment with the necessary meticulousness can take place, the invention also proposes a mounting of the intermediate roller which is movable in the direction of the impression cylinder, preferably resilient towards it before"

An embodiment of the invention is shown schematically in the drawing Fig. 1 is a perspective view of the cylinder, Fig. 2 is a plan view.

The forme cylinder 1, on the surface of which the print image is etched or engraved, is colored by an inking unit (not shown), the excess ink being wiped off with a doctor blade 2. Runs across the plate cylinder 1, the web to be printed 4, which may be made from different materials, _o as paper, plastic and metal films for "To exercise the necessary for printing Anpreßdruekes serve the intermediate roller 3» the coated with a rubber or plastic layer is, and the impression cylinder 5 made of steel. To switch the pressure on and off, both are mounted together in a common, vertically displaceable bearing holder 6. Instead, these two cylinders can also be firmly mounted and the JJVormy cylinder 1 can be moved downwards.

The impression cylinder 5 is with its two steering knuckles 7 rotatably mounted in ball or roller pendulum bearings 9. These are arranged in special storage holders 8, in the bearing holders 6 by means of the threaded spindle 10 and hand crank 11 horizontally across the longitudinal axis of the impression cylinder 5 can be moved. This makes it possible to move the two bearings 9 of the impression cylinder 5 from the vertical Projection of the axis lines of the superposed cylinders 1,3 and 5, which determines the normal known operating position to adjust, so that the impression cylinder 5 comes to lie crossed to the intermediate roller 3, as Fig. 2 shows above all.

If both bearings 9 are adjusted equally in opposite directions, like the Pig. 2 shows, the point of alignment between the counter-pressure roller 5 and the intermediate roller 3 lies in the longitudinal center thereof _o

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With this, the ends of the cylinders 5 and 1 of the contact forces A acting on the contact pressure, which leads to a deflection of these cylinders in the opposite direction, which becomes greater the higher the contact pressure xxxsL and the longer the cylinder s are, and which results in uneven printing across the web width and onto the longitudinal center of the cylinder relocate. The contact pressure is increased in the longitudinal center of the cylinder and decreased at the two cylinder ends. The contact pressure can thus be evenly distributed over the entire length of the cylinder; even printing The result is across the entire width of the web. The effect of the adjustment made can be seen on it check and correct if necessary ,, the measure of The entanglement of the impression cylinder 5 with respect to the intermediate roller 3 depends on the degree of deflection and is therefore also dependent on the level of the contact pressure, which is determined by the print image, depending on whether it is is difficult or easy “Since the average is up to a few Can be tenths of a millimeter, the degree of entanglement is naturally not great.

So that the intermediate roller 3 can easily adapt to all movements of the impression cylinder 5 is for them a movable bearing is provided in the vertical direction, which is preferably in the direction of the impression cylinder 5 is designed to be resilient.

A rotogravure rotary press equipped with a printing unit according to the invention enables high quality printing presses Quality printing in any multicolor. Also can in the case of a web to be printed that does not occupy the maximum width of the machine, or in the case of a one-sided Print image the contact pressure of the impression cylinder 5 in the desired area uniformly to the effect of irramtiiTp. * Man only needs to choose the displacement of the bearing holder 8 of different sizes so that the cylinder 5 is slightly on one side is moved more out of the normal middle position than in the opposite direction on the opposite one

209824/0339

Claims (5)

Claims π} Printing unit with forme cylinders vertically stacked on top of each other, Intermediate roller and impression cylinder of a rotogravure printing machine, characterized in that the two bearings (9) of the impression cylinder (5) transversely to his Longitudinal axis gjtJBX adjustable ± s ± x sindo 2. Printing unit according to claim 1, characterized in that the bearing holder supporting the stub axles (7) of the impression cylinder (5) in ball or spherical pendulum bearings »(8) are transversely adjustable in the machine frame side walls. 3 »Printing unit according to claim 1 or 2, characterized in that that the cross-divisibility on both sides of the perpendicular projection of the axis lines of the superimposed Cylinder (1,3,5) extends. 4. Printing unit according to claim 1, characterized by a common, uniform, counter-rotating adjustability of the two bearings of the impression cylinder (5). 5. Printing unit according to claim 1, characterized by a In the direction of the impression cylinder (5) movable, preferably resilient mounting of the intermediate roller (3) 20982 4/0339 Blank page