414,507. Calculating-apparatus. GARDNER CO., 534, Mitchell Street, Orange, New Jersey, U.S.A. July 3, 1933, No. 18816. Convention date, July 12, 1932. [Class 106 (i).] Adding and subtracting apparatus.-A multiple-bank key-board, independently operated, listing and adding machine is provided with mechanism for obtaining the product of two factors set on the keyboard. The multiplicand is first set on the keyboard, a multiplication key depressed, and the machine given a stroke of operation to store the multiplicand in the machine by the selection of a number of partial product plates stepped to represent the units and tens values. The multiplier is then set on the same keys and a multiplier lever operated to control mechanism, which upon a single operation of the main handle for each digit in the multiplier, effects the simultaneous summation of the units and tens of the partial products upon the appropriate denominations of the laterally movable totalizing-counter. The factors are printed during their respective machine cycles and the product is printed on operating the machine after depression of the total or sub-total key. The machine shown is a modified form of the machine described in Specification 293,080, [Class 106 (i)]. The keys 10, Fig. 3, co-operate with a locking plate 18 and the lower end of a depressed key forms a stop for a related lug 19 of a differential bar 14 that is pivoted to one arm of a three-armed operating lever 13. There is a lever 13 for each bank of keys and each lever is connected to a type bar 15 and, through a link connection 16, to an actuating segment 17. Each bar 14 co-operates with a zero stop 21 which is released on depression of a key. The segments 17 are pivoted on a frame 33 and are held against a bail 20 by means of springs 22. When the main handle is operated a shaft 24 is rocked to move the bail whereupon the segments are displaced differentially until the lugs 19 engage the depressed key stems. An arm 25, Fig. 4, loose on the shaft 24 has a spring connection with an arm 27 fixed on the shaft and is provided with rollers 28 which co-operate with opposed cam surfaces of a rocker frame 29 pivoted at 30 and connected by a link 31, Fig. 10, to the end plate of the bail 20. As the main handle begins its rearward movement the frame 33 is rocked, to carry the segments into gear with the totalizer pinions 112, by a stud 38 thereon, Fig. 4, engaging the cam end of a lever 37 on the axis 30 which lever is rocked by a pin 39 on the arm 25 engaging a pawl 40 on the lever. At the same time the movement of the frame is operative to cause withdrawal of the detents 116. At the end of the return movement a pin 44 on the arm 27 engages a second pawl 45 on the lever 37 to disengage the segments and restore the parts to normal. Transfer mechanism.-The numeral wheels 111 of the totalizer, Fig. 6, are each provided with a ten-toothed gear 109, Figs. 6 and 9, meshing with a nine-toothed gear 106 mounted on an eccentric 102 fixed to the wheel of lower denomination. The gears 106 are provided with nine-toothed gears 108 driven through intermediate pinions 117 by the pinions 112. By a complete revolution of the gears 106 within the gears 109 the carry-over is effected. To counteract the crawling action each wheel 111 has a cam 128 operating a follower 119, Figs. 7 and 8 on a sleeve 118 supported by an arm 120 loose on the shaft 113 of the pinions 112. The follower 119 is held by a spring 131 against a pin 122 on an arm 121 splined on the shaft 113.. In action the movement of the follower causes the intermediate pinion 117 to move around the pinion 112 to counteract the movement imparted by the eccentric 102 until at the instant of transfer the roller on the follower slips off the high part of the cam so as to bring back the pinion to normal position thereby effecting a transfer movement at a single step. Multiplying-apparatus.-The multiplicand having been set upon the keys 10 in the usual manner a multiplicand key lever 136, Fig. 15, is depressed to rock a shaft 137. The movement of the shaft causes an arm 138, Fig. 10, thereon to engage a pin 139 on the pawl 40 to hold said pawl in non-add position, the key 136 being held depressed by an arm 140 on the shaft engaging an extension on the key release bail 88. At the same time the key lever, by engagement with a pin 152 on a link 150, rocks members 149, 151 ; the member 149 rocks a shaft 148, Fig. 3, having projections adapted to displace arms 145 pivoted on a shaft 146 to pull rods 143 pivoted thereto out of engagement with a zero stop ledge 144 while pins 159 on the rods move beneath the shoulders of arms 161 connected to the actuating levers 13 ; the member 151, Fig. 15, at the same time places a pin 153 into the path of movement of a cam lug 154 of a pawl 155 pivoted on a plate 156 of the main shaft 24. When the main shaft is now operated the rods 143 are moved forwardly and the levers 13 are rocked to depress the rods 143 the amount of depression depending on the key depressed. At the end of the forward movement the arm 151 is rocked by an arm 157 on the pawl to bring the pin 153 below the lug so that on the return movement the parts are restored to normal with the exception that the rods 143 are moved rearwardly and held in contact with selected plates 142. These plates extend across the rear of the machine and are stepped at each end to represent the partial products ; the upper plate represents units, the second and third plates represent the tens and the units of the products involving a multiplicand of two, and so on. The rods 143 contact with the tens value plates. This storing operation results in the multiplicand being printed and the numeral keys and multiplicand key being released. The multiplier is now set on the keyboard and a multiplier lever 162, Figs. 14, and 15 is pulled forward. This lever functions to (1) disconnect the actuating segments from the levers 13, (2) disable the keyboard clearing mechanism, (3) release a lock holding the partial product selector plates, (4) set a mechanism to control the successive multiplier operations, and (5) step the totalizer carriage laterally. (1) The lever 162 is secured to a shaft 171 operatively connected to a shaft 167, Fig. 16, so that on operation, the shaft 167 raises its guide fingers 166 to move them away from pins 174 on the links 16 which move under spring action to uncouple the pins 164 from their respective levers 13. The movement of the links 16 is arrested by pins 175, thereon Fig. 3, contacting with their tens' selector rods 143, extensions 163 on the links 16 serving as the units' value selectors. If any rod 143 remains in zero position the corresponding link 16 will be moved to engage the lower edge of the ledge 144, while if any rod 143 is set to engage the lower edge of the ledge the link 16 will co-operate with the top selector plate 142. (2) The shaft 171 carries an arm 176, Fig. 10 which when moved to active position releases a pawl 93 of the clearing bail 88 from the influence of an operating lever 94. (3) On the shaft 171 is mounted a crank arm 181, Fig. 14, connected to a retaining finger 179 having a pin and slot connection with the machine frame and normally positioned to hold multiplier setting plates 177 at the left side of the selector plates 142. By rocking the shaft 171 the plates 177 are free to move. (4) To control the successive operations a shaft 184 is provided with a series of spirally arranged pins 183. When the shaft 171 is rocked an arm 189 thereon Fig. 15, moves an arm 191 into engagement with a cam boss 192, Fig. 14, on the end of the shaft 184 thus causing the shaft to move until a ratchet wheel 186 is aligned with an escapement pallet 187 a projection 188 on which lies in the path of movement of the operating plate 156. The shaft 184 is stepped round at each operation and a pin 183 engages a projection 185, Fig. 3, on the corresponding lever 13 to move it from neutral to zero position. A second series of spirally arranged pins 197 is mounted on the shaft 184 for the purpose of feeling the denomination with the highest significant multiplier digit. The setting of the shaft 171 withdraws an arm 195, Fig. 16, from a spring controlled sector 193 which is thereby permitted to rotate the shaft 184 until one of the pins 197 engages a shoulder 198 of the highest denomination latch 21 that has been released by the depression of a numeral key 10. The machine is now ready to compute the first partial product; during the first part of the operating cycle the selector plates 142 are held by arms 207 pivoted at 208 and extended to form dwell surfaces 210 for rollers on the operating plate 94. This dwell affords time for the lateral setting of the plates 177. These plates are mounted in a frame slidable on a shaft 211, the frame having a rack bar 212 geared through pinions 213, 214, with a crown segment 215 mounted on an arm 216 that is connected by a link 218 to an arm 219 operatively connected to an arm 220 on the main shaft. As the arm 216 is raised by the operation of the shaft a latch 221, Fig. 16, is moved to forward position beneath the end 182 of the zero-set lever 13. The lever 13 then moves to the extent determined by the key depressed and the plates 177 move along to the appropriate section of the selector plates 142. An arm 226, Fig. 15 on the shaft 227 of the operating lever 94 co-operates with a cam surface on a detent lever 223 which is moved to engage a comb plate on the rack 212 to hold the plates 177 in adjusted position. The plates 177, having been set, form stops for the selector plates 142 which by the movement of the operating bail 20 are pushed, under spring action, by the set rods 143, 16, into contact with the plates 177. The units and tens values are added by giving the segments 17 their ordinary movement and an additional movement beyond their normal rest position. To enable this to be done the bail 20 i