A mechanism for loading and unloading the design cylinder in a rotogravure press unit including support bearings mounted in a pivotally supported housing in the side frames of the unit so as to be self aligning with the shaft of the design cylinder for freely supporting therebetween the design cylinder. A pair of supporting members having bifurcated heads for cradling therebetween the design cylinder, are pivotally secured to a pair of cranks mounted for pivotal movement adjacent the inside surfaces of the side frames. Pivotal movement of the support arms and cranks is controlled by a mechanism for pivoting the support arms away from the press unit thereby lifting the design cylinder off its bearing and swinging it away from the press.
In an image recording apparatus in which an image optically formed on a photosensitive material is transferred as a visible image onto an image receiving material by pressurization, a back-up roller is employed to press a free nip roller against a fixed nip roller so that the pressure at the nip region of the two nip rollers is made uniform over the entire length thereof. The back-up roller has a width smaller than the width of the free nip roller against which it presses, and the back-up roller presses only against a central portion of the free nip roller.
An apparatus for supporting the shaft journals of a printing cylinder, that can be dipped into a dye vat, of a rotary roller printing machine, preferably a Rotogravure Rotary Roller Printing Machine, on support rolls for the purpose of exchanging the printing cylinder. In order to be able to exchange the printing cylinder in a simple and fast manner, the support rolls are arranged on horizontally movable beams via which the support rolls can be shifted between the bearings of the printing cylinder and an extended position in which there is provided a device that lifts and inserts the printing cylinder.
An offset printing machine is disclosed wherein printing cylinders used for a new run are carried by a carriage into a vicinity of a printing unit of the machine. The printing unit is provided with two lateral movable arms which automatically and successively transfer every printing cylinder from the printing unit onto the carriage and inversely, the new cylinders from the carriage onto the printing unit.
Apparatus for automatically loading and unloading printing cylinders from a rotogravure printing press. The printing press, which is of itself conventional, includes two upright frame members having horizontal openings for lateral insertion of the journals of a printing cylinder. According to the invention, a transport arm is pivoted at one end on each of the frame members and provided at the other with a device for supporting and lifting a journal of the printing cylinder. Means are also provided for separately moving the two transport arms and lifting devices so that the printing cylinder can be lifted by the lifting devices from a dolly or hoist adjacent the printing press, transported into the press by the transport arms with the cylinder journals passing into the horizontal openings in the frame members and lowered into position in the press.
A bearing assembly for a rotary printing press cylinder supports a journal of the cylinder using a plurality of support rollers. At least one of the cylinder journal support rollers is moveable so that the cylinder will either be supported or can be removed from the printing press.
