A processing unit for rotational processing includes at least two processing cylinders and a machine frame. A first processing cylinder is movably mounted in the machine frame, a second processing cylinder is stationarily mounted in the machine frame and a pair of support members is provided for each respective processing cylinder. A respective support member of the second processing cylinder has a solid joint, a manipulator and an annular segment attached to the solid joint and contacting one support member of the first processing cylinder. A solid joint is linearly displaceable by the manipulator and an annular segment is linearly displaceable therewith. A gap dimension between the processing cylinders can therefore be adjusted in a simple, accurate manner with precise repeatability. A label printing machine having the processing unit is also provided.

The invention relates to a measuring element for flexo printing elements (11) for controlling an application pressure with respect to a printing material support (2), having several printing planes (7, 8, 9) which reduce in the upward direction and do not cover in the surface.

The present invention relates to a device for replacing the printing roller in a printing unit, in particular for in line rotary flexographic machines.

A printing unit has a printing form cylinder, an impression cylinder opposite the printing form cylinder and at least one substrate carrier apparatus with which a printing substrate is moved through between the printing form cylinder and the impression cylinder, wherein the substrate is printed in a printing region between the two cylinders. The substrate carrier apparatus is moved linearly during a uniform rotation of the two cylinders along a linearly extending track, limited in length by a longitudinal extension of the printing unit. The substrate carrier apparatus is accelerated from a resting start position to an operating speed, to be reached upon reaching the printing region, the substrate carrier apparatus is moved at least in the printing region at constant speed, and the substrate carrier apparatus is decelerated after leaving the printing region to a resting end position on the track.

A printing mechanism (10) has a plate cylinder (12) that supports a printing plate (18). A printing plate reference field (100) has a lowest reference field surface (101) lower than the printing plate (18) and a highest reference field surface (105) higher the printing plate in the printing motif region. A control unit can vary a distance between an impression cylinder (28) and the plate cylinder (12) for pressing a printing substrate against the printing plate (18) and can very a distance between an inking roller (20) and the printing plate (18). A first sensor (34) connected to the control unit determines a quality of a printed image of the printing plate reference field (100) on the printing substrate (30) and a second sensor (36) connected to the control unit determines a quality of a negative image of the printing plate reference field (100) on the inking roller (20).

A printing module of the flexo printing type, is provided with an anilox roller and an impression roller which are set up between two frame parts. Further, the printing module comprises a plate cylinder assembly which is receivable in a plate cylinder holder assembly. The plate cylinder holder assembly is provided with a plate-shaped body part with a supporting ring support surface with a special curve which is symmetrical with respect to a curve plane. Further, each plate cylinder holder assembly comprises a body part support assembly via which the body part is connected with the associated frame part, wherein the body part support assembly is configured for pivoting the body part about a first imaginary pivoting axis and for pivoting the body part about a second imaginary pivoting axis, such as to allow a substantially independent distance setting between the plate cylinder and the anilox roller on one side and between the plate cylinder and the impression roller on the other side.

A printing module of the flexo printing type, is provided with an anilox roller and an impression roller which are set up between two frame parts. Further, the printing module comprises a plate cylinder assembly which is receivable in a plate cylinder holder assembly. The plate cylinder holder assembly is provided with a plate-shaped body part with a supporting ring support surface with a special curve which is symmetrical with respect to a curve plane. Further, each plate cylinder holder assembly comprises a body part support assembly via which the body part is connected with the associated frame part, wherein the body part support assembly is configured for pivoting the body part about a first imaginary pivoting axis and for pivoting the body part about a second imaginary pivoting axis, such as to allow a substantially independent distance setting between the plate cylinder and the anilox roller on one side and between the plate cylinder and the impression roller on the other side.