Patent GB-497833-A (GB)
Abstract: 497,833. Typewriters &c. BARON, H. (Astrawerke Akt.-Ges.) April 26, 1937, No. 11944. [Class 100 (iv)] [Also in Group XIX] Type-bar machines ; hammer - impression arrangements.-In a machine for calculating according to the four rules of arithmetic, record material carried by a roller platen 89, Fig. 1, may be impressed alternatively by typeheads actuated by typewriter keys 980 or by type-bars 87 set and actuated automatically by the calculating-apparatus. The type-bars are each connected to an associated differential actuator 50 by a link 86 slotted to embrace a rod 88 carried by the bellcranks 66, Fig. 4. The type-bars are normally in the position shown wherein their upper ends are clear of a guide 90 for the type-heads of the typewriter mechanism. However, upon the release of the machine, cams 75, 76 on a shaft 77 rock the guide 90 forwardly out of the paths of the type-bars and then, through the bell-cranks 66, raise the rod 88 to elevate the type-bars into position for printing zeros. Simultaneously with the latter operation, the actuators are released by a bail 63 and take up their setting, adjusting the type-bars correspondingly. Each type-bar 87, Fig. 1, is slotted to receive a pin on the upper end of an associated impression lever 114 that is urged counterclockwise by a spring 119 and operated by the cams 75, 76, Fig. 4, through a bail 108 and an individual floating lever 98. Each floating lever is guided by combs 99, 100 and is urged downwardly and rearwardly by a spring 102, whereby the cam-shaped upper end 104 of the lever is pressed against a bar 105 and the shouldered lower end 98<1> against an abutment 97 of the associated actuator 50. As an actuator moves rearwardly past the zero position, its floating lever pivots about its upper end until shoulders 106, 107 take over the bail 108. Now, as the bail rises, a lug 112 on the upper end of the floating lever wipes past the nose of the impression lever and engages its upper side. Upon the ensuing downward movement of the bail, the impression lever is rocked clockwise until, owing to the cam surface 104, it is suddenly released to the action of its spring 119. The impression lever and type-bar now return rapidly clockwise until the lever strikes the bar 105, after which the type-bar proceeds under its own momentum to strike the platen, this movement being permitted by the elongation of the pivotal slot of the impression lever. The return movement of the cams 75, 76 does not effect printing, the floating levers being held clear of the bail 108 by a member (not shown) carried by the bell-cranks 66. Zeros to the left of the highest significant figure are not printed since the actuators 50, Fig. 1, of these denominations do not move far enough to engage the shoulders 107 of their associated floating levers over the bail 108. However, each floating lever is provided at its upper end with a lateral projection 126 that takes over the lever of next higher order and thereby ensures the printing of zeros to the right of the highest significant figure. The type-heads 966, Fig. 1, of the typewriting mechanism are each carried by an arm 961 pivoted by links 959, 960 to a carriage 967 that may be lowered by a key u to select the capital type for printing. An extension of each link 960 is connected to the associated operating key 980 through a link 973 and lever 975. Feeding of the ink-ribbon is controlled by a bail 987 straddling the undersides of the levers 975.