Patent GB-216174-A (GB)
Abstract: 216,174. Chase, G. C. Jan. 22, 1923. Multiplying and dividing apparatus.- Stop mechanism for multiplying and dividing machines provided with reversible numeral wheels is brought into play by members on the numeral wheels or by the automatic restoration to neutral position of the reversible driving means. The invention is described in connection with a machine of the type set forth in Specification 27231/12. Reversing mechanism. The sun gear 102 loose on the transfer shaft 154, Figs. 4 and 5, is driven from a motor shaft 101 through lugs 101<a>, 102a and a spring 101<b>. The planet wheels 103 gear with internal teeth 105 on a ring 106 having clutch teeth 107 on the outside. The planet wheels 108 gear with a wheel 109 loose on the sleeve of the sun gear 102 and carrying a member 110 having clutch teeth 110<1>. When the member 106 is held, the carrier 104<1> is driven in the same direction as the shaft 101, and when themember 110' is held, the carrier is driven reversely. For holding either member a clutch lever 111 is provided having three positions in the two outer of which the claws 113, 114 engage with and hold the member 110 or 106 while in the central position the shaft 101 rotates idly. Add and subtract keys. Two special keys 120, 121, Fig. 10, are provided with pivoted arms 123 jointed together at 123<1>. When either key is depressed the joint 123<1> moves down one of the inclines of a fixed cam 122<a> and rocks a shaft 125 through the medium of a forked arm 124. At one end of the shaft 125 is an arm 126 carrying a pawl 127, Fig. 14, which engages a notch 128<1> in the end of the setting lever 128. Pawls 121<a> co-operate with lugs on the keys and with a cam 122<d> on the shaft to prevent depression of a key during the cycle of operation. The setting lever 128 has a slot 129 embracing a projection 130 of dutch lever 111. Stop mechanism. The crank arm 20 on the shaft 4 makes one complete revolution counterclockwise or clockwise during an addition or subtractive operation. The link 21 connects the crank 20 to a lever 22 pivoted at 23. A stop element 25 pivotally carried on an arm 24 pivoted at 23 is normally held out of action by a lever 31. This lever may be tripped by two means. Firstly by means of the releasing pawl 136 on depression of the add or subtract key, and secondly by the pin q of a numeral wheel 13 when moving from 0 to 9 or 9 to 0. The lever 31 is mounted at the left-hand side of the machine so that some one of the numeral wheels on the .sliding carriage will be in position to act upon it. The setting lever 128 has cam edges 131, 132 either of which may depress a roller 133 on the rear end of the releasing lever 134 pivoted at 134<1>. The releasing pawl 136 is pivoted on a stud 137 on the lever 134 and has a stud 140, Fig. 21, on which is pivoted the restoring pawl 149, a spring 138 impelling the arm 150 against the stud 137. Upon depression of an add or subtract key the setting member 128 is rocked, and the rear end of the lever 134 moved down carrying the lug 141 of the, pawl 136 below the lug 142, whereupon the spring 138 rocks the pawl 136 so that the lug 141 lies below the lug 142. For ordinary additive operations the key is depressed and immediately released, and the lever 134 returning under the influence of the spring 135, the lug 141 strikes the lug 142 tripping the stop pawl 30 which is swung by its spring 26 so that an arm of the stop element 25 lies in the path of the end 27 of the rock lever 22, the element 25 and its carrying arm 24 pivoted at 23 being rocked until arrested by the cushion 29<1> of a fixed stop 29. The clutch lever 111 is returned to neutral position by an extension 144 of the lever 24 engaging one of two cam edges 147 on the lever. The arm 24 in its rocking movement engages an arm 164 of a pivoted lever 158 which overlies an arm 169 pivoted at 165 to the lever 134 and moves this arm to tension the spring 167 and thus provide additional means for returning the lever 134 on release of the depressed key. In the normal position, Fig. 14, the arm 152 of the pawl 149 abuts against a lug 151 on the arm 24. When the rear end of the lever 134 moves down on depression of a key, the arm 152 is brought by its spring below the lug 151 and on the upward movement, on release of the key, strikes the lug 151 causing the restoring pawl 149 to rock and bringing the lug 141 of the releasing pawl 136 immediately under the lug 142. On release of the stop element 25, the projection 151 is disengaged from the arm 152 and the spring 138 returns the pawl to such position as to be engaged by the projection 151 on the return movement of the arm 24 after the lug 30 has passed under the raised end of the lever 31. The restoring pawl 149 will then be moved bodily and the releasing pawl 136 pivotally to disengage the lug 141 from beneath the lug 142 permitting the forward end of the lever 31 to fall upon the lug 30, the spring of the lever 134 acting to raise the rear arm a further step to bring the lug 141 in front of the lug 142. In multiplication and division the proper key may be held depressed for several cycles. For instance, in division, with the dividend on the numeral wheels 13 and the divisor properly placed on the keyboard, the subtract key is held depressed until the divisor has been subtracted once more than the correct amount; the numeral wheels of the higher order will then all show " 9 " and the machine stops. The add key is now depressed and the machine given one cycle. The carriage is then shifted one space to the left and the operation repeated for the next quotient digit. The transfer shaft 154 is provided with a series of stepped transfer arms and to counterbalance the weight of these arms a spring-pressed arm engages a suitably-shaped cam on the shaft. The automatic stopping of the machine may also indicate that the capacity of the machine has been exceeded. Specification 192,434 also is referred to.