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US 4,101,224 AGranted
Escapement mechanism for typewriters
AssigneeInternational Business Machines Corporation
InventorsJohn Robert Litkenhus, Donald Wayne Stafford
Life of this patent
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AssigneeInternational Business Machines Corporation
InventorsJohn Robert Litkenhus, Donald Wayne Stafford
Estimating the term…
Disclosed is a mechanism for replacing the non-escapement magnet normally utilized to inhibit escapement during certain machine functions on a typewriter. A detent arm is connected to the normal pawl knock-off arm so that upon the print shaft rotating and effecting, by a cam thereon, movement of associated linkage and motion of the knock-off arm to disengage the pawl from the ratchet wheel, the detent arm associated with the knock-off arm detents the ratchet wheel and inhibits escapement thereof until the linkage and knock-off arm returns to its normal position by rotation of the print shaft. Thus, if the escapement magnet coil is not energized, the pawl associated with the magnet will return to its normal position and the ratchet wheel will, because of the detent of the member associated with the knock-off arm, be inhibited from motion.
In a typewriter having a cyclicly rotatable print shaft, a driven leadscrew having a ratchet thereon, said leadscrew connected to a carrier containing a typing element thereon, and a pawl for engagement with said ratchet and normally biased to inhibit motion of said leadscrew;
In a typewriter having a cyclically rotatable print shaft, a driven leadscrew having a ratchet thereon, said leadscrew connected to a carrier containing a typing element thereon, and a pawl for engagement with said ratchet and normally biased to inhibit motion of said leadscrew;
Dependencies are inferred from the claim text.