Patent GB-389632-A (GB)
Abstract: 389,632. Calculating-machines. GARDNER CO., 534, Mitchell Street, Orange, New Jersey, U.S.A. Feb. 8, 1932, No. 3750. Convention date, Feb. 25, 1931. [Class 106 (i).] Adding and subtracting apparatus; operating by motors.-The main shaft is rocked by an electric motor when an add or a subtract motor key is depressed and the timing of totalizerengagement is normally for addition and is changed for subtraction by use of the subtract key. The invention is set forth as applied to the machine described in Specifications 272,569 and 293,080, [both in Class 106 (i), Calculating &c.]. Specification 389,719 is also referred to. Motor drive. The main shaft 301, Fig. 3, is oscillated bv a crank disc mounted on and frictionally driven by the hub of a gear wheel 102 rotated by the motor. The frictional drive takes place through a spring 105 secured at one end to the disc, enwrapping the hub and bent outwardly at the other end to be engaged normally by a control lever 106. When either of the add and subtract motor release keys 114, 274 is depressed a latch 112 is rocked and frees the control lever which thereupon rocks counterclockwise clear of the spring and, through a roller 109 closes the motor circuit at 110. At the end of the cycle a nose 115 restores the control lever to hold the spring and break the circuit. Adding and subtracting. The machine is normally set for adding but when the subtract key 274 is depressed to start the machine a lever 117 and shaft 118, Fig. 4, are moved clockwise so that a link 122, Fig. 6, shifts the control plate 326 to change the engagement timing. Moreover a pin 352 on this plate raises a stepped plate 225 to allow a pin 612 on an arm connected with a sign-printing typebar to rise and thus bring the minus sign to the printing line. A connection between this typebar and the adjacent lowest-numeral type-bar permits the latter also to rise to cipher-printing position if no amount has been set up. Totalizer selection. In addition to the three keys for selecting one or other or both totalizers for actuation a further key is provided for causing one totalizer to be actuated in the opposite sense to the other. Depression of this key releases any of the other totalizer keys, if depressed, and rotates double cams 455, Fig. 6, on the upper totalizer shaft to present a further cam surface to a corresponding cam edge on a lever 421 rocked by the engagement-effecting plate 419. Thus with this setting the upper totalizer is thrown into engagement when the lower is disengaged and vice versa. The stepped plate 225 above mentioned is positioned by the totalizer keys to cause corresponding signs to be printed. To prevent operation of the machine when neither accumulator is in active position, as with partial depression only of key 270, a lever rocked by the keys bears a roller to close a second switch in the motor circuit and is latched, when properly operated, until the end of the operation is reached. Non-adding. Depression of the non-add key rocks shaft 118, Fig. 4, in a direction opposite to that imparted by the subtract motor key 274, plate 117 causes the machine to operate, and the shaft is latched in operated position until near the end of the cycle. The rocking of shaft 118 by the non-add key moves link 122, Fig. 3, to the right to place a stop behind a pin on the control plate 326, Fig. 6, so that after the forward stroke, which disengages the totalizers, the parts are held and prevented from functioning to engage the totalizers for the return stroke. Total and sub-total taking. The total and .sub-total keys 278, 273, Fig. 14, effect the conditioning of the control rocker 325 for varying the totalizer engagement and moreover disable the symbol type-lever stepped plate 225 and selectively set an auxiliary stepped plate 226 to position the type-lever. Either key will also trip a latch 620, Fig. 11, normally engaging a lug 627 on the total segment 618, which thus released, operates as in Specification 293,080 to align the totalizer pinions and eventually effect release of latch 112 to start the machine. To prevent locking-down of either key owing to depression being continued after the automatic release has taken place, means are provided for repeating the total operation as long as the key is held down. To this end, an arm 229, Fig. 11, on the key-rocked shaft 206 operates the latch 620 through a pin 132 and as the segment 618 rises it raises lever 621 to move the pin from engaging the arm 229 into contact with a shoulder of a rock-plate 134. As the machine operates, the cam 318 will release a push-rod 135 so that the rock-plate turns until pin 132 comes below arm 229. If the key is held depressed therefore the arm will hold the pin in the path of the shoulder so that at the end of the operation the cam 318 will retract the parts and the shoulder will again trip the latch to effect a second totaltaking operation. To prevent initiation of a total-taking operation unless the parts occupy their full cycle position an arm 136 on shaft 206 is locked by a pin 137 on the rock-plate if this should be out of home position.