Patent GB-760532-A (GB)
Abstract: 760,532. Calculating-apparatus. WAGEMANN, H. July 28, 1954 [July 28, 1953], No. 22087/54. Class 106(1). In a machine for the four rules, differential bars of the amount setting mechanism are adapted, upon restoration, to engage and set a number of drive bars which are adapted to set the printing mechanism and also to set either the totalizer actuator or a revolution counter. Differential mechanism. The machine illustrated has a set-pin carriage 2 fitted with an item indicator 12 and longitudinally slidable bars 8. As the digits are entered in turn by means of the ten keys 1, the carriage is step-shifted and the bars 8 are released in turn to springs 9 by the tripping of pawls 5 so that the bars 8 register the item set. The carriage is then rocked about a shaft 302 to engage ears 8a on the bars 8 with rack teeth 13a of differential actuater bars 13 and a restoring bar 23 then moves forwardly to restore the bars 8 and so transfer their setting to the actuater bars. Racks 14 and 15 are pivoted to the actuater .bars and one or the other set of racks is raised into effective position by actuation of a correaponding key lever 71 or 73. With the racks 14 raised, the forward movement of the actuater bars 13 is transmitted to toothed wheels 18 controlling totalizer actuation, whereas the racks 15 are adapted to mesh with wheels 19 for setting the revolution counter 20. Rack extensions of the actuater bars 13 are in permanent mesh with twin sectors 21a, 21b adapted to set type wheels 22. The wheels 18 are each fast with a control cam 26 (Figs. 6-9) and loose on a transverse actuating shaft 35. Adjacent each cam 26 is a carrier disc 28 on which a toothed sector 32 is radially adjustable by means of a bell-crank 30 fitted with a roller 31 adapted to follow the contour of the cam 26. The carrier discs 28 are secured to the actuating shaft 35 and as the shaft rotates during machine actuation, the sectors 32 are moved radially outward by the cams 26 to engage totalizer actuating wheels 36 over a part of each revolution. Thus, depending upon the setting of the cams 26, the sectors 32 engage the wheels 36 earlier or later in each cycle and consequently with a variable number of their teeth corresponding to the value of the item set by means of the keys 1 and transmitted to the wheels 18. The wheels 18 and cams 26 are held set by detents 34 during progress of the calculation, at the conclusion of which they are returned by springs 37. Transfer mechanism. Transfer is effected by means of pin wheels 206 (Figs. 1; 14 and 18), engaged wih the totalizer actuating wheels 36 and adapted to be advanced by a pawl 205 on a carry lever 202. At transfer, a tooth 42 (Fig. 18), of the lower order totalizer wheel assembly trips a lever 200 the tail of which rocks the higher order carry lever 202 causing its pawl 205 to travel back over one pin of the associated pin wheel 206. Subsequently, a cam 33 on the disc 28 restores the carry lever 202 by engagement with a roller 204 thereon to advance the pin wheel 206, and so the higher order totalizer wheel. Printing mechanism. The settings of the differential bars 13 are transmitted to type rolls 22 by means of twin toothed sectors 21. The type rolls 22 are carried between arms 100 urged by a spring 108 towards a platen 114. A pawl 106 normally retains the arms 100 with the spring 108 tensioned and the rolls 22 meshed with their sectors 21. The pawl 106 follows the downward movement of the sectors 21 so bringing a trigger 107 pivoted to the pawl within range of a firing bar 111. The firing bar 111 then trips the pawl 106 so that the printing rolls 22 are impressed upon the platen 114 by the springs 108. Item indicators. Settings of the totalizer actuation control wheels 18 are registered by na indicator 63. The set-pin carriage 2 has its own item indicator 12, being returnable for setting of a further item during progress of a calculation. The indicator 12 is actuated by sectors 10 connecting with the differential bars 8 of the carriage.