B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/93
B41J 1/20 (2006.01) B41F 17/00 (2006.01) B41F 33/04 (2006.01) B41J 3/54 (2006.01) B41K 3/12 (2006.01)
Patent
CA 1066555
ABSTRACT OF THE DISCLOSURE The present invention provides an apparatus for print- ing sheets, plates and pipes comprising: a rotatable horizontal drum having a longitudinal opening in its peripheral surface; printing apparatus including movable flexible endless belts aligned side by side longitudinally of the drum in at least one row and arranged within the drum, each of the endless belts being provided with printing types on its outer peripheral sur- race, the printing types being positionable outside the drum at the opening when most remote from the center of the drum, power transmitting apparatus provided for the belts respectively and each including an electromagnetic clutch, slip ring segments for feeding current to the electromagnetic clutches respectively, the slip ring segments being mounted substantially on the drum and arranged on circular lines substantially concentric with the axis of the drum, a device for detecting the displacement of each of the printing apparatus as an electric pulse every time the printing apparatus is displaced by an amount corresponding to one pitch of the arrangement of the printing types, slip ring segments for feeding current to the detecting device respec- tively, the slip ring segments being mounted substantially on the drum and arranged on circular lines substantially concentric with the axis of the drum, a device for selectively determining the duration of energization of the electromagnetic clutch based on the detection by the detecting device so as to cause the belt to bring a specified printing type thereon to the outside portion at the drum opening; and a device for detecting the reference point of each of the belts in preparation for determining the duration of energization of the electromagnetic clutch. The apparatus comprises several tens of printing means aligned as a unit and incorporated in a plate drum which apparatus is adapted for automatic typesetting.
250609
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