HIGH-SPEED WIRE PRINT HEAD WITH WIRE PRINT POSITION SHIFT APPARATUS

摘要

A matrix head wire print position shift apparatus which includes a plurality of longitudinally movable wire print devices which are disposed in guides which movably support the longitudinally movable wire print devices for longitudinal movement in response to wire drive armature devices which cause longitudinal movement of the movable wire print devices between a non-print position and a print position. A wire drive end bearing plate supports the front end portions of the longitudinally movable wire print devices and is transversely shiftable between a first print position and a second print position by a transversely shiftable support device. In the first print position the print wire devices are selectably operable to print characters defined by a first set of adjacent substantially tangential circularly shaped dots. In the second print position the wire print devices are selectably operable to repeat printing of the characters with a second set of overlapping circular dots which are offset from the first sets of dots by approximately one half of the diameter of the first set of dots.