Patent GB-190905387-A (GB)
Title: Improvements in Calculating Machines.
Inventor: FELT DORR EUGENE
Filed: 1909-03-05
Granted: 1910-06-06
Abstract: 5387. Felt, D. E. March 5. Adding - apparatus for m o n e t a r y values.-In multiple - bank key - operated machines of the type described particularly in Specification 13,094/04, and also in Specifications 17,136/88, 19,964/90, 20,990/96, and 19,675/00, the totalizing-counter with its associated actuating and transfer mechanism is rearranged for the purpose of adapting the machine to British monetary values and further to enable the machine to be readily cleared to zero. The numeral wheels are placed upon a separate shaft 58, Fig. 10, and their pinions are driven through intermediate wheels 61 upon the zeroizing- spindle 60 from the receiving-wheels 63 which engage the actuating-segments. Three farthings keys are provided and co-operate with the "even- " number" stop-lever to arrest the actuating- segment when the farthings-wheel has turned through “, ¢, and ¥ of a revolution respectively ; similar arrangements are made for the higher denominations, there being eleven pence keys and a single key for the tens-of-shillings, the corresponding numeral wheel bearing alternating "0" and " 1 " symbols. Transfer - mechanism. - In the tens-of-shillings denomination a large spur-wheel 112 drives a pinion 114 attached to the transfer-wheel 115, which is thereby rotated at five times the usual rate to provide for the frequent transfers ; a considerably stronger transfer spring is used in the unitsof-shillings denomination for the same reason. Since the wheel 115 moves farther than others when effecting a transfer, the ears 121 whereby the transfer roller 122 disengages the detents are made of increased length. By means of an auxiliary key-lever coupled to the actuating-segment the work of the tens-of-shillings key is spread over the whole of the key-stroke. The transfer-cams 66 are of increased size and rotundity of contour and each has a lateral stud 69 for tripping the arm 70 of the three-armed locking-pawl 71. Subtracting is effected by the addition of the proper complementary digits, which are marked upon the keys, and to eliminate the false transfer thus produced to the left of the highest denomination of the subtrahend it is necessary to hold back the subtraction-lever 134, Fig. 15, at this point during registration, whereby the proper transfer pawl 138 is held out of action. Zeroizing-mechanism.-The clearing of the totalizer is effected by swinging the handle 139 upon the shaft 140 rearwards and then forwards, thereby moving the zeroizing segmental lever 144, Fig. 2, and associated parts, which are cam-operated from the main zeroizing-shaft 140 ; other parts similarly operated alternately depress and release the actuating-segments by means of the cross-bar 155 to effect a one-digit addition upon all denominations at the end of the rear stroke of the zeroizing- handle and again towards the end of the forward stroke, and also to control the locking-detents 75 by lowering their retaining-studs 156. These studs are upon arms 165, which are at one moment swung forwards in order that teeth 234 may arrest pins upon the receiving-pinions and thereby stop the numeral wheels in the " 8 " or equivalent position. At the beginning of the rearward stroke of the zeroizing - handle a release yoke 172 is swung against the lower ends 175 of the transfer latches 176, thereby preventing strain upon the transfer springs. Positive movement of the numeral wheels to the desired position in zeroizing is derived from the rotation of the intermediate gear-wheel shaft 60 by the zeroizing segmental-lever 144 ; as shown in Fig. 25, a number of shallow V-shaped grooves 181 are provided in this shaft, which, while permitting direct insertion of the shaft in assembling, are adapted to engage, upon the proper rotation of the shaft, spring -controlled hooked pawls 183 carried by the intermediate wheels, which are thus rotated to the desired extent. In the tens-ofshillings denomination these arrangements, together with those for subtraction, are slightly modified to give clearance for the large carrying-gear 112. The action in zeroizing is as follows: the actuating segments are all idly depressed through unit distance, the stop levers 165 are thrown forward to bring their stop teeth 234 into operative position and to limit the downward movement of the segments, the subtraction levers are rocked to disable the transfer pawls 138, the release yoke is operated, the actuating-segments rise and add unity on all denominations, being subsequently depressed to release the detents, the zeroizing-segment rises idly and then descends to effect rotation of the intermediate shaft, the subtraction levers are returned to normal, the actuating segments rise to add unity slightly before the farthings wheel comes to "0," and finally a consequent transfer from right to left brings all the other denominations to zero. Specification 16,273/01 is referred to.