GB1254570A - Improvements in or relating to high-speed printers - Google Patents

Abstract

1,254,570. Selective printing. HONEYWELL Inc. 10 Dec., 1968 [2 Jan., 1968], No. 58733/68. Heading B6F. Print hammer arrangements.-A high-speed printer includes an array of print hammer assemblies each comprising a hammer actuator H12 and two or more print slugs t1, t2 mounted at letter-space distances along a printing line. The actuator is shared by both the print slugs t1, t2 but only one of the latter is effective to effect print impression by momentum. In the embodiment described with reference to Fig. 3, a control shaft CS is rotated in synchronism with a print cylinder PR so that in alternate cycles cams C1, C2 slide the print slugs t1, t2 into inactive and active positions respectively relative to the hammer H12. As shown in Fig. 4, print slugs S1, S2 are made active and non-active respectively by a slide SB<1> with recesses n1, n2, one recess for each group of slugs and for each hammer A12, A34. In the embodiment shown in Fig. 5, both print slugs HH1, HH2 are actuated, but one is rendered abortive because its flight is arrested by a tooth ft1 on a sliding bar SB<11> and the other slug passes through a slot to effect impression. In the next cycle the teeth and slots are interchanged by a sliding action of the bar SB<11>. Other embodiments are described in which the print slugs are moved sideways or tilted out of the path of the hammer actuators. The print cylinder may be replaced by endless chains of type or endless tracks each arranged perpendicular to the line of print.