Patent GB-272174-A (GB)
Abstract: 272,174. Friden, C. M. F. June 1, 1926, [Convention date]. Multiplying and dividing apparatus. - In motor-operated machines means are provided for connecting up the operating means with the zeroizing-mechanism of the totalizing and revolutions counters under the control of manipulative means for the purpose, of resetting the counters individually or simultaneously. Interlocking arrangements are provided between the main operating mechanism and the zero resetting devices. The invention is shown embodied in a machine of the type described in Specification 229,642. Operating by motors.-The motor 65, Fig. 1, through gearing 67 - - 69 and 71 and a friction clutch 72 drives the main shaft 66 which through a clutch 73 drives an aligned shaft 74 connected through reversible gearing to the differential actuator 2'7, Fig. 6. The clutch 73 as shown in Fig. 10 comprises a ratchet wheel 101 on the shaft 66 and a housing 102 on the shaft 74 with a spring-controlled pawl 103 normally held inoperative by the engagement of the end 104 of the pawl with a projection 105 on a lever 96. This clutch is under the control of the " plus " and " minus " keys 86, 87, the depression of either of which rocks a member 93 and through a link 94 rocks the lever 96 to render the clutch effective by withdrawing the projection 105. The control keys 86, 87, also co-operate with a T- piece 88, Fig. 6, connected by a link 89 to a member 85 having an arcuate cam-shaped end 84 for the purpose of displacing axially the shaft 83 and the member 76 engaging the hub of the pinion 75 of the reversible gearing to cause a reversal of the movement of the differential members 27. The operation is initiated also upon depression of any one of a bank of multiplier keys 112 by a cam projection 114 on the key stem operating a slide 113 which by means of a rock lever 115 and pin 116 on the link 94 operates the clutch lever 96. Automatic means as described in the above-mentioned Specification are provided for permitting rotations of the differential members in accordance with the value of the multiplier key depressed. Zeroizing mechanism.-The totalizing-counter 28, which is mounted on a longitudinally movable carriage, comprises a series of numeral wheels 32 with pinions 33, Fig. 8, engaging intermediate pinions 34 adapted to be acted upon bv the differential members 27. The wheels 32 are loose on a shaft 35 and when the shaft is rotated spring-pressed balls 39 in the shaft are adapted to engage internal projections 41 on the wheels to reset the wheels, movement being arrested at the zero position by the engagement of stops on the wheels with the transfer levers 45. A notched disc on the end of the shaft 35 is adapted to rock a lever to displace a shaft 38 to relieve the pressure of springs 37 to free the detents 36. The revolutions counter 51, as shown in Fig. 5, is of a similar construction, the detent 59 during the rotation of the shaft 53 being rendered inoperative by rotation of the slotted shaft 63 through an arm on the shaft 63 engaging a notched cam on the counter-shaft 53. The shafts 35, 53 are connected by sprocket gearing 135, 132, Figs. 1 and 3, to clutch members 120, 121 respectively, loose on the main shaft 66. Each clutch member carries a pawl 124 which is adapted to engage a corresponding ratchet wheel 122 fixed on the shaft 66 but is normally held out of engagement therewith by the projecting end of a control lever 127 or 127<1>. These levers are connected to keys 142, 143 the depression of either cr both of which renders either or both operative to rotate the shafts 35. 53 to effect the resetting operation. The hub 137 of the sprocket wheel 136 is splined to a hollow shaft 138 in which slides the shaft 35 so that the totalizer may be reset in any position. Interlocking.-To prevent either of the clutch members 120, 121 being thrown into engagement while the clutch 73 is operative and vice versa, each of the control levers 127, 127<1> has a slotted hub 147 journaled on a shaft 146 in which is disposed a corresponding pin 148 permitting a limited movement of the lever. An arm 152 on a shaft 151 lies in the path of the end of the clutch lever 96 and to the other end of the shaft is secured an arm 153 in contact with an arm 154 on the shaft 146. When the lever 96 is rocked to throw in the clutch 73 the shaft 151 is rocked To cause a rocking of the shaft 146 whereby the pin 148 is moved to one end of the slot to prevent movement of the control levers 127, 127<1>. If one of these levers is moved the shaft 146 cannot be rocked so that the arm 152 prevents movement of the clutch lever 96. Specifications 185,852 and 207,858 are also referred to.