Single revolution mechanism
AssigneeInternational Business Machines Corporation
InventorGerrit Burgers
Life of this patent
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Abstract
A single revolution mechanism is disclosed in which a feed roll is mounted on a print lever which is attached rotatably to a pivot. By rotating the lever, the feed roll can be brought into contact with an external driving shaft. The feed roll is coupled to a ratchet mechanism comprising a pawl and ratchet. The pawl is engaged with a spring urged pressure lever so that when the feed roll is driven, the ratchet pushes itself away from the second lever to latch the print lever and roll in the operative position during a full revolution. After performing the revolution, the print lever reengages the ratchet to unlatch the device from the driving roll in preparation for another actuation.
Claims6
A single revolution mechanism, wherein a coupling between a shaft to be driven and a continuously rotating shaft is effected and latched, and after performing a predetermined rotation of the shaft to be driven, the latching and the coupling with said continuously rotating shaft are automatically interrupted, comprising:
- a feed roll (6) rotatably mounted at one end of a first lever (3);
- means (4) for bringing said first lever from the rest position to an operative position in which operative position said feed roll is in a proper position to be driven by frictional contact with a continuously rotating shaft (11);
- and, further means for mechanically latching said lever and feed roll in the operative position independently of said means (4) and means for eliminating this mechanical latching after a predetermined rotation of said feed roll.
Dependencies are inferred from the claim text.