Printing – Planographic – Processes of lithographic printing
Patent
1975-06-26
1977-12-27
Burr, Edgar S.
Printing
Planographic
Processes of lithographic printing
1011325, 101147, 101350, 118 7, 222 54, B41M 106, B41F 724, B41F 3100
Patent
active
040648044
ABSTRACT:
A duplicator system and method are provided for preparing a lithographic master and for producing duplicated copies from the master in a fully automated system. An ink and moisture system is provided for supplying ink and moisture to a master on a master cylinder. During a pre-inking phase, an ink ductor roller is operative for a predetermined duration within variable ranges, as determined by the number of duplicated copies to be reproduced, and a moisture roller is operative to transmit moisture to the inking system. An early moisture circuit is also provided for conditioning the system by supplying moisture prior to a pre-inking phase in those instances wherein there has been a significant delay between the processing of two consecutive masters. Control means including a sensing device is provided for sensing the ambient temperature at an ink fountain and providing an indication thereof at predetermined temperature values. Subsequent to the pre-inking phase and during a normal duplicating operation, in response to an indication of the sensed temperature, the speed of transfer of ink from the ink fountain to the ink form roller is automatically controlled by altering the movement of the ink ductor roller, i.e. by interrupting the ducting action of the ductor roller for preselected time intervals. Thus, as the viscosity of the ink changes in response to the temperature, the control means is effective to vary the ducting pattern of the ink ductor roller such that an amount of ink substantially suited to the temperature situation is applied to the master.
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patent: 3457857 (1969-07-01), Burger
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patent: 3741115 (1973-06-01), Keller
patent: 3749009 (1973-07-01), Suzuki
patent: 3776133 (1973-12-01), Ritzerfeld
patent: 3888173 (1975-06-01), Ritzerfeld
Addressograph Multigraph Corporation
Burr Edgar S.
Root Russell L.
Suter R. E.
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