Patent GB-346362-A (GB)
Abstract: 346,362. Multiplying and dividing apparatus. MATHYS, A. W., 52, Chancery Lane, London.-(Monroe Calculating Machine Co. ; 555, Mitchell Street, Orange, New Jersey, U.S.A.) Dec. 5, 1929, No. 37358. [Class 106 (i).] A multiple-bank machine may be operated through more than one cycle at any denominational position of the carriage and after registration of a partial product by one cycle of operation the actuating mechanism returns to a position for entering the multiplicand only in any succeeding cycle. In the form described keys may be set for multiplying by 2 or 5 in one cycle. The differential and registering mechanisms are of the Thomas type but the driven pinions are in a number of parts rendered operative selectively under the control of the two multiplier keys 41, 42. The keybanks with their detent and clearing means are of known construction but the key stems are broadened at their lower ends to operate four differential bars 60 .. 63 each controlling by an arm such as 72, Fig. 9, a sleeve 75, Fig. 6, slidable on a squared shaft 76. Depression of a key moves all the bars and all the sleeves but only certain of the latter are effective according to the condition of the machine. In the normal condition (adding and subtracting), Fig. 6, the depression of a key may shift, through bar 60 and arm 72, the sleeve 75 and through bar 62 and arm 82 another sleeve 85 so as to bring one or both pinions 86, 87 within the influence of stepped gear 89 and a five-toothed spur-wheel 88 respectively. These gears are secured on a sleeve 90 slidable on a squared shaft 91 driven by bevel gears from a shaft 94 rotated by the operating crank handle 44. If the " 3 " key is depressed, for example, bar 60 will position pinion 86 to receive three steps of movement from the gear 89 whereas bar 62 and sleeve 85 will not be moved. If the " 8 " key is depressed the bar 60 and pinion 86 will be shifted as before and also the bar 62 will be moved to place pinion 87 in the plane of spurwheel 88, so that in the operation of the machine the squared shaft 76 carrying the sleeves will receive eight steps of movement, i.e. three from gear 89 and then five from wheel 88. These differential movements are transmitted in the usual manner through reversible gearing 121 to the totalizing-counter 118 mounted in a pivoted transversely-movable frame 113, and transfer is provided for in the known manner. Setting the machine for multiplying. The key 41 is depressed when it is desired to multiply by 2 and key 42 for multiplication by 5. Depression of either key rocks a lever 128, Fig. 3, and so, through a slot and a pin on a crank arm, rocks a cross shaft 133, arms of which engage grooves in the sleeves 90. Thus when one of these keys is depressed the sleeves are shifted toward the front or back of the machine to put the adding gears 88, 89 out of action and to render the multiplying gears effective. The key setting is maintained by a spring-controlled latch arm 136 which is automatically operated for release by a cam on shaft 94 or may be manually operated. A pair of spring-connected pivoted plates 144, 145 exercise a centralizing influence on the cross shaft 133. Multiplication by 2. The setting for multiplying by 2 slides the sleeves 90 to the rear to bring a stepped gear 148 and a single toothed wheel 150 on each sleeve 90 into operative position. If an item key, say the " 6 " key is depressed the bar 60 will slide pinion 149 on the shaft 76 of the same denomination as the key into the plane of the two teeth on the stepped gear 148 and bar 62 will slide pinion 152 of the next denomination into the path of the single-toothed wheel 150 on the adjacent sleeve 90. Consequently when the operating handle is given one rotation the values 1, 2 will be entered in the respective wheels of the totalizing- counter. Multiplication by 5. Depression of key 42 will slide the sleeves 90 to the front to render a fivetoothed wheel 179 and a four-stepped gear 180 operative with respect to pinions 166, 178. When an item key is set therefore its effect upon the bars 61, 63 is such as to position one or both of these pinions relatively to their drivers so as to enable the units and tens digits of the product to be entered in the counter, when the machine is operated. Overthrow, preventing ; transfer-mechanism.- In adding or subtracting operations the known Geneva-stop mechanism of the Thomas machine prevents overthrow of each shaft 76 when the gear 88 has completed its drive. The Geneva-stop device 108, Fig. 18, is cut away at 108<1> at its forward end so that when the finger 126, Fig. 3, rigid with the member 108 is slid rearwardly for transferring by operation upon the toothed wheel 127, the cut-away comes into the plane of stopwheel 107 to allow the transfer step to take place. The shafts 76 are also locked after gear 89 has executed its driving movement in those cases involving the addition or subtraction of values 1 to 4. For this purpose each shaft has a scalloped wheel 109, Fig. 2, adapted to be locked by a cutaway disc 110 after gear 89 has passed through its operative angle. If, however, a 5 or higher key is depressed the shift of sleeve 85 by the bar 62 puts the scalloped wheel out of action. In multiplication by 2 each shaft 76 is locked against overthrow when gear 148 operates without pinion 152, i.e. when a key 1 .. 4 is depressed. To this end each shaft has a crown wheel 155, Figs. 2 and 20, co-operating with a toothed arm 156 fixed to the adjacent sleeve 90. In adding or subtracting the arm is in front of the plane of the crown-wheel and has no influence on it therefore but when key 14 is set the resultant rearward displacement of the sleeve 90 renders the arm effective to stop the shaft 76 after actuation. The tooth on the arm then passes between the crown teeth to the inside while transfer takes place and then emerges to the outside. If a key of value 5 or over is depressed the crownwheel 155 of higher order is moved rearwardly to disable it and so allow registration of the tens value. Similar mechanism is provided for preventing overthrow during multiplication by 5. Multiplier or quotient counter. The sleeve 90 on the lowest shaft carries operating sectors 182, 183, 184, Fig. 17, provided with one, two and five teeth respectively, to drive a wheel 185 to corresponding extents according to the setting of the machine for addition, multiplication by 2 and multiplication by 5. The wheel 185 is geared with the counter through a reversing gear 192 &c., Fig. 2, controlled by a finger 190 depending from the reversing bar 191.