GB183103A - Improvements in offset platen printing presses - Google Patents

Abstract

183,103. Grosse, E. April 11, 1921. Offset platen machines; inking-apparatus; tripping-arrangements.-Relates to platen printing-presses of the kind adapted for offset as well as direct printing and comprising a number of beds, one of which co-operates with the platen for producing impressions transferred to this bed from another bed by means of a transfer roller, and consists in arranging the type bed and the transfer bed at an angle to one, another at opposite sides of an ink-distributing roller, means being provided for reciprocating the inking-rollers over the type bed, and the transfer roller over both beds, and also for lifting the transfer roller clear of the beds during its return movement. The type bed 13 is inked by rollers 5, and the impression is transferred therefrom by a transfer roller 6 to the bed 14 co-operating with the platen 11. The rollers 5 receive ink from a roller 67 at the angle between the two beds and also from other rollers 34 receiving ink from a drum 35, which also supplies the roller 67 by means of an intermediate roller 81 and an endless apron 82. The inking- roller carriage 70 is reciprocated over the bed 13 by means of a bell-crank lever 62, link 60, and crank-pin 69 on a gear 68 engaging a mutilated gear 80, so that the carriage dwells at each end of its stroke. The transfer roller 6 is reciprocated over both beds by a bell-crank 65, link 63, and crank-pin 79 on a gear 71 driven by a gear-wheel 38. Stops 73, 74 coact with wedges 72 supporting the bearings of the transfer roller, to lift it away from the beds during its return stroke and to move it into contact therewith for the down stroke. When used for direct printing, the forme is arranged on the bed 14, and the bed 13 may be used as an ink table, the transfer roller being replaced by an inking-roller.