Man Roland Druckmaschinen Ag

Harris Corporation

W Robert Gelinas

Charles H Dufour

George Rinaudo

Ernest H Treff

Bohdan D Washchynsky

Arthur J Leale

Michael J Stankosky

David J Leitch

Roland D Horth

John J Mellow

Craig L Whipple

To permit ready exchange of the length of printed subject matter to be reproduced, particularly to make packaging cartons, the cut-off size of printing cylinders, as well as blanket cylinders of an offset machine is constructed, can be changed in this manner: The respective cylinders include a cylinder shaft (44, 45) on which a lightweight cylinder sleeve (3, 3a, 4, 4a) of different circumferential size can be placed. The shafts, which can be of steel, are retained on movable support arms to swing about drive gears (23, 28) fixed in the machine, the support arms on one side wall (1) of the machine being axially movable out of the way through a window (51) formed in one side wall (1) to permit replacing the sleeves (3, 3a, 4, 4a) and, upon re-seating and re-positioning by pneumatically loaded spindles, maintaining engagement with the fixed drive gears (23, 28), as well as with inker and/or damper application rollers (8, 9, 10), some of which can be movable and some of which are fixed in the frame of the machine, also preferably pneumatically loaded. An impression cylinder (5), pneumatically and mechanically supported, is movable against the blanket cylinder sleeve (4, 4a), and positioned in the machine in accordance with the respective size of the sleeves (3, 3a, 4, 4a) on the printing cylinder shaft (44) and the blanket cylinder shaft (45), respectively. The sleeves are seated on the shafts by a conical end seat, from which they can be pushed out by hydraulic pressure.

Rotary web printing machine, particularly for printing on thick or

To permit easy removal of a printing machine inker fountain box, without leakage of ink from the box, the box is formed with a box body (1) and side walls (3) which have curved front faces (12) fitting against an inker roller (9). To remove the box, for example by lifting off with handles (2) from a printing machine, a curved cover (4) is inserted into guide slots (5) formed in the side walls, which are located just inside of the end surfaces (12) of the end walls. The cover, preferably, has a stripper element (6) at the end, so that, as it is inserted into the curved slots (5), ink on the inker roller (9) is stripped downwardly leaving, at the end, only a small accumulation of ink (19) which can easily be wiped off. The bottom of the inker cover (4) fits against the inker body (1) to prevent leakage of ink from the now removable inker box (1). To permit return of ink stripped off the inker roller (9) in operation of the machine by a doctor blade (22) mounted on the inker body (20), the bottom wall (1') of the inker body is formed with a recessed edge (127) or a group of apertures (27) therein, which can be closed off by a flap (28) of a flap valve, or by a sealing strip or flap (28, 928) secured to the cover (4) and overlapping the opening (127) or openings (28) when the cover is inserted in the guide slots.

Portable, removable and insertable ink fountain box for a printing

To permit ready exchange of plate cylinder (13) - blanket cylinder (12) printing couples of different circumferences in a printing machine, the blanket cylinder - plate cylinder printing couple is retained in a cassette (8), with adjustment elements (282, 281, 26) to control the throw-off position of the blanket cylinder in the cassette. The adjustment elements are selectively engageable or disengageable against matching adjustment elements (284, 283) in the printing tower (9). The printing tower adjustably supports an impression cylinder (11) located above the blanket cylinder, when the cassette is installed in the tower, so that printing will be from below. Ink application rollers (361, 362, 363) are force-biassed against the respective plate cylinders, and movable in a slide path which is radial with respect to the plate cylinder of the respective diameter, under control of slide feelers (161, 162, 163) engaging a stationary ring (213) in the cassette concentric with the plate cylinder. The impression setting of the impression cylinder (11) is determined by a bearer ring setting element (29) on the cassette, engaged by a support arm (22) for the impression cylinder. The cassette is removable in a removal path (15b) which has an upward movement component, so that it can be picked up by a hoist (17), after removing the web from between the impression cylinder (11) and the blanket cylinder (12), which is below the impression cylinder, and after swinging the impression-cylinder out-of-alignment with the cylinders in the cassette.

Printing machine system, especially for printing on a web of heavy or

A plate lockup mechanism secures a printing plate to a printing cylinder. The mechanism includes two movable members disposed within the printing cylinder. Means connected with one of said members engages one end portion of the printing plate to secure the one end portion of the plate on the cylinder and means connected with the other of said members secures the other end of the plate to the cylinder. Each of the members is movable between first and second extreme positions. A biasing spring coacts between the two members and urges one of the members to either one of its extreme positions when the other member is in its first extreme position and when the other member is in its second extreme position.

Plate lockup mechanism

Growing community of inventors

Jewett City, CT, United States of America

W Robert Gelinas