Patent GB-395688-A (GB)
Abstract: 395,688. Calculating-machines. ELLIS ADDING-TYPEWRITER CO., 338, Elizabeth Avenue, Newark, New Jersey, U.S.A. Dec. 14, 1931, No. 34573. Convention date, Dec. 12, 1930. [Class 106 (i).] In a calculating-machine having a travelling carriage and two adding and subtracting totalizers, stops on the carriage control the selection of a totalizer for addition or subtraction and also control the setting of a camselecting member which ensures the selection of the other totalizer for corresponding subtraction or addition, whereby all amounts added into one totalizer will be subtracted from the other, and vice versa. A total key is provided for each totalizer, such key being locked when the corresponding totalizer is in an " overdrawn " condition. The functional interconnection between the totalizers may be disabled at will. The two adding and subtracting totalizers are referred to as Nos. 1 and 3 respectively ; there are also two other totalizers operable in an additive manner only. If No. 1 totalizer is to add and No. 3 to subtract, a stop 55, Fig. 10, is set on the carriage to cause the rocking of levers 51, 134. The former raises a link 50, a projection 112, Fig. 7, on which swings anticlockwise a two-part lever 105. A stud 115 on the lever 105 depresses the tail 116 of a two-part latch 68 which would otherwise be in a position to condition the No. 1 transfer mechanism for subtraction. The end of the lever 105 lowers another twopart latch 100 which, upon the operation of the machine, moves the No. 3 transfer mechanism to its subtractive position. On the main shaft 30, which moves first in a clockwise direction, are secured plates 31, 32 carrying flying levers 33, 73 controlling No. 1 and No. 3 totalizers respectively. The flying lever 33, Fig. 8, is connected by a link 37 to the No. 1 totalizer frame 39. When the link 50 is lifted a latch 49 releases a lever 45 pivoted to the machine frame. A pin 44 on the lever 45 moves a lever 41 on the flying lever 33 into the path of a stop 46 on the plate 31. The frame 39 is thus rocked anticlockwise at the end of the first half-stroke to engage the No. 1 totalizer for addition. The other lever 134 depressed by the carriage stop is connected by a link 133 to a lever 132 connected to a lever 127 having a roller 126 which, through a lever 124, depresses a cam-selecting member 119. A projection 120 on the member 119 engages a pin 122 on a subtraction lever 76 and so brings the end 74 of a pawl pivoted on the lever 76 into the path of the flying lever 73. This flying lever is thereby rocked at the beginning of the first half-stroke to cause, through the link 79, the subtractive engaging movement of the No. 3 totalizer frame. The point 89 of the plate 32 also releases a lever 91 connected to a link 93 which swings a latch 94 into such a position that it can lock a lever 98 secured to the No. 3 transfer-controlling shaft 99 The latch 100, which has been lowered by the lever 105, engages a pin 113 on the No. 3 totalizer frame 80. This latch is thus rocked when the totalizer is engaged with the racks. The latch 100 is connected to the lever 98 and thus causes the rocking of the transfer-controlling shaft 99. If No. 1 totalizer is to subtract and No. 3 to add, carriage stops rock levers 87 and 134. The former raises a link 86 connected to a latch 85 engaging a lever 84 pivoted to the machine frame and having a pin 83 co-operating with a lever 82 on the flying lever 73 controlling No. 3 totalizer. The raising of the link 86 also rocks clockwise a lever 117 to slide the camselecting member 119 to the left, whereby the projection 120 is removed from the region of the pin 122 and another projection 121 is brought over a pin 123 on a subtraction lever 36. The lever 134 effects the depression of the lever 124 and of the member 119 which now rocks the subtraction lever 36 and causes a pawl 34 thereon to engage the flying lever 33 at the beginning of the stroke to effect subtraction in No. 1 totalizer. The rocking of the lever 127 by the lever 134 moves to the left a link 139 a cam slot of which causes the lowering of a pin 143 to allow the latch 68 to move into its operative position. When the frame 39 is rocked this latch rocks No. 1 transfer-controlling shaft 66 into its subtractive position by engagement with a pin 38 on the No. 1 totalizer frame 39. The shaft 66 is locked in this position by a latch 62 actuated from the plate 31 through a lever 59. When the plate 31 returns to its normal position, it releases the latches 94, 62 and the transfer-controlling shaft 99 or 66 is returned to its normal position by a spring 141 or 67. Total-taking. When a total is to be taken, a carriage stop rocks the levers 51, 87, but not the lever 134. The total key corresponding to the totalizer carrying a positive balance is then depressed and the machine operated, the amount being cleared from the said totalizer and added into that carrying the negative balance, whereby both totalizers are zeroized. Since the link 139 is not moved, the latch 68 is held to prevent the swinging of the lower part 104 of the lever 105. Both the transfer-controlling shafts 66, 99 are then held in inoperative positions. Total-key locking means. When No. 3 totalizer passes into an " overdrawn " condition a shaft 147 is rocked anticlockwise bv known means and, by links 151, 152, causes the insertion of a detent in a notch of the No. 3 total key 159. When No. 1 overdraft shaft 165 rocks anticlockwise, links 167, 168 rock a lever 169 to insert a detent 170 in a notch 171 of the No. 1 total key 172. The overdraft shafts rock back to their normal positions when the totalizers pass into positive conditions. Interlocks.-The simultaneous depression of both total keys is prevented by a projection 173 on the lever 169. If No. 3 key 159 is depressed, a pin 174 engages this projection and swings the lever 169 to insert the detent 170 in the key-stem notch 171. Depression of No. 1 key 172 moves the notch 171 below the detent 170 so that the lever 169 cannot swing. Ink-ribbon mechanism.-The machine may be used in such a way that the positive amount standing on No. 3 totalizer is in reality an overdraft. When a total is taken from No. 3 totalizer the amount is printed in a distinctive colour, the depression of the No. 3 total key 159, Fig, 2, causing its locking latch 203 to swing clockwise and, through a link 201, to rock a lever 196, Fig. 4, normally pivoting at the point 193. The lever 196 is connected by a link 197 to the ribbon-shifting mechanism 198. Disabling-mechanism. The functional connection between the No. 1 and No. 3 totalizers may be disabled and No. 3 totalizer caused to operate in an additive manner only by the rocking of a finger-lever 175, Fig. 2. This action also disables the ink-ribbon shifting mechanism. A link 182 connected to the lever 175 moves a hook 183 to engage a stud 109 on the latch 100 and so prevents the No. 3 transfer mechanism from being conditioned for subtraction. A stud 190 on the lever 175 lifts the lever 117 to move the member 119 away from the position in which its projection 120 can operate the subtraction lever 76. The lever 175 also lifts a hook from the pin 193 on which is pivoted the lever 196 of the ribbon-shifting mechanism. The pin 193 is secured in a lever pivoted to a fixed plate. When the hook is removed, the link 201 causes the pivot-pin lever to rock and does not shift the link 197. Specifications 28253/08, [Class 100, Printing, Letterpress &c.], 241,983, [Class 106 (i), Calculating &c.], and 348,105 are referred to.