Patent GB-294468-A (GB)
Abstract: 294,468. Friden, C. M. F. July 23, 1927, [Convention date]. Multiplying and dividing apparatus with recording- apparatus.-In a machine for performing calculations according to the four rules each actuator unit is associated with a valueselecting element adapted to be set directly from the setting means and a rotation of the actuator operates a means to transfer the introduced value to the actuator. The machine as shown is provided with a laterally movable totalizer carriage and has a known form of reversible rotary differential actuator as described in Specification 185,852 comprising a differentially settable cam member 6 and a radiallv movable toothed actuating member 5, Figs. 2 and 3. Differential mechanism; keyboards. - The setting of each of the differential cam members is effected through a toothed sector 7 on the member and an arcuate rack 8 on the rear end of a pivoted lever 9 the movement of which, when the main shaft 3 is operated, is lin.ited by the co-operation of a stop 46 on the lever with a stepped segment 45 on a member or value selecting element 41 set by depression of a key. Each selecting element has an arcuate toothed part 43 engaging a rack 44 on a corresponding slide 35. The slide has a number of pins 36 differentially positioned with respect to cam faces 34 on the key stems so that depression of a key 25 causes movement of the slide 35 and segment 45 to an extent determined by the value of the key depressed. The keys are held in their depressed positions by retaining slides 31 and can be released for return to normal position by clearance keys 25<a>. Movement of the levers 9 is derived from the main shaft through levers 52, 57. The, levers 52, by engaging the flat surface of cam-discs 54, hold the main shaft 3 in full cycle position. Rotation of the shaft 3 causes movement of the levers 52 about their pivots 56 on the levers 57 and through the springs 53 the levers 57 are rocked about their pivots 58 to raise the forward ends thereof, these ends being connected to projections 61 on the levers 9 so as to push the levers 9 upwards until arrested by the stepped segments. The differential cam members 6 are locked in set position, during the machine operation, by a cam on the main shaft and an arm 64 secured to a shaft 65 on which is mounted a plurality of arms 66 each of which has a projection 67 adapted to engage the toothed periphery 68 of the members 6. The lower end of each lever 52 engages a pin 69 on the corresponding lever 57 so that on its return to normal the lever 57 and lever 9 are restored. Printing mechanism; printing totals. - The rear end of each lever 57 is connected by a link 73 to a type carrier 72 and is thereby set to a position depending on the key depressed, an impression hammer 76 on a lever 77 being actuated by the single projection 81 of a cam 79 on the main shaft to effect a record on a paper-strip 83 through an inking-ribbon 84. The inking-ribbon is advanced in any suitable manner and the paperstrip is fed as shown between rollers by means of a ratchet and pawl 87 connected by a lever 88 and link 89 to the arm 64. For the purpose of taking a total a lever 103, Fig. 3. is provided. This lever is secured to a shaft 104 having a plurality of levers 121 loosely mounted thereon, one for each of the slides 35: each lever bears against a pin 123 on the slide and has a, projection 124 engaging a pin 125 on a corresponding lever 106 secured to the shaft 104. When the, totals lever 103 is pulled forward the levers 106 are rocked thus permitting movement of the levers 121 to impart movement, through the pins 123, to the slides 35. To each slide 35 is, pivoted an arm 99 having a notch 98 engaging a pin 97 on a lever having a finger 95 for engaging the depression, presented to it, of a cam 92 on the totalizer numeral wheel 15. In the normal forward' movement of the slides by depression of the keys the arms 99 engage pins 112 projecting from the levers 106 to disengage the arms 99 from the pins 97; on the movement of the levers 106 bv the totals lever the pins 112 enter inclined portions formed in the arms 99. The depressed keys are released by the lower arm of the levers 106 engaging a pin 115 on the retaining slides 31. In total-taking after the slides have been set the actuator is given a rotation in the reverse direction to restore the numeral wheels to zero position, and an extension on the arms 66 raises the arms 99 to free the fingers 95.