GB899368A - Improved key operating machine - Google Patents

Abstract

899,368. Typewriters &c. INTERNATIONAL BUSINESS MACHINES CORPORATION, Nov. 18, 1960 [March 28, 1960], No. 39684/60. Class 100(4) A key operated machine such as the single element printer shown has key buttons 5 on key levers 6 and associated interposers 7 which may be integral therewith. The key levers and interposers are clamped to a bar 1 and depression of a key causes the interposer to flex and its finger portion 9 to pass through an opening 12 into holes 16, 17 in control tapes 15. This downward movement of the interposer 7 causes a reduced portion 27 to move down an opening 31 in a plate 30 to become engaged behind a shoulder 35 to hold the interposer latched if the key is released. Later in a cycle of operations thus initiated a cam 75 on a power shaft 50 acts through linkage to move a knock-off bar 38 to the left to disengage the interposer 7 from the shoulder 35 to allow it to return to an inoperative position and to its initial position when the key is released. In the single element printer shown flexing of an interposer 7 rocks a bail 26 to close contacts 28 to initiate a single cycle of the power shaft 50 by engaging a clutch 53. In the cycle a cam 70 releases the tapes 15 so that those having long holes 17 engaged by the finger 9 move under the action of springs 20 while those having holes 16 engaged are held stationary. Movement of the tapes 15 acts through selecting links 90-94 selectively engaged by a bail 140 actuated by cams 72, 73, as described in Specification 873,920, to rotate and tilt the print head 44 to select the desired character which is imprinted when a cam 71 actuates a lever 152. The cam 70 then acts to restore the tapes 15 to their original position while release of the finger 9 allows the interposer to rise to return the bail 26 to open the contacts 28 to disengage the clutch 53.