GB652113A - Improvements in or relating to keyboard controlled telegraph apparatus - Google Patents

Abstract

652,113. Selective punching machines. CREED & CO., Ltd. April 5, 1948, No. 462. [Class 31 (ii)] [Also in Group XL (b)] Keyboard apparatus for perforating a tape in accordance with code signals comprises a first set of longitudinally movable combination bars in operative relation with character key levers, a second set of longitudinally movable members normally out of operative relation with the key levers, and a shift key lever which, on actuation, changes the operative relation of the sets of combination bars and, on release, restores the operative relation between the key levers and the first set of combination bars. As shown in Fig. 1, one set of code combination bars, typified by the bar 1, is held in operative position relative to the key levers 2 by projections 10 formed on the underside of the code bars and resting on rollers 6 rotatable on pins 8 carried by a bar 9, the width of the projections 10 being sufficient to allow the requisite longitudinal movement of the bars 1. When the second set of bars, represented by the bar 3, Fig. 2, is to be moved to the operative position, the clockwise rotation of a bell-crank 14 by the shift key-lever 15 moves the bar 9 to the left so that the lower surfaces of the projections 12 are supported on the rollers 6. Pivoted levers 17, 18 utilized to operate members for controlling the punching operation engage bevelled notches 20 in the bars 1, 3 and the extent of movement of the sets of bars is limited by stops 21 which provide abutments for effecting the raising of the bars 1, 3 when the rollers 6 engage the sloping surfaces 11, 13 of the projections 10, 12. When the lever 15 is released, the bar 9 returns to the right, under the action of a spring (not shown). The sets of bars 1, 3 are supported by slotted guide plates 5. A universal bar, indicated in Fig. 3 (not shown), is provided with projections sufficiently wide to be supported by the rollers 6 during its movement in both positions of the bar 9. Specification 422,134 is referred to.