Patent GB-340256-A (GB)
Abstract: 340,256. Calculating- apparatus. WOODS, W. B., 225, Tottenham Court Road, London.-(Ellis Adding Typewriter Co.; 338, Elizabeth Avenue, Newark, New Jersey, U.S.A.) Sept. 23, 1929, No. 28770. [Class 106 (i).] Adding and subtracting apparatus.- In a machine having an adding and subtracting totalizer and means for locking the total and sub-total control keys when an overdraft condition occurs an additional locking means for the starting-bar or other operating member is provided when such condition occurs. In machines with a travelling carriage means are also provided in connection with the ribbon shift mechanism for printing the amount on the totalizer in a distinctive colour when the carriage is moved to a particular position such as the credit column. As shown applied to an Ellis machine as described in Specification 241,983, [Class 106 (i), Calculating &c.]. An overdraft shaft 102, Figs. 1, and 3, is rocked clockwise by means of the latches 96, 100 and arm 103 when the total of the items subtracted exceeds that of the items added. The shaft 102 carries an arm 114 connected by a link 115 to a locking lever 113 which is adapted on the occurrence of an overdraft to block the upward movement of a pin 116 on the circular operating lever 104. This lever, which is pivoted at 104<1>, is controlled by a spring 105 and co-operates with a threearmed lever 106 adapted to release the motor drive. The levers 104, 106 are connected by links 108,109 to a starting- bar 107 depression of which is prevented as above described by the locking lever 113. The known mechanism which prevents depression of the total and sub-total control keys is controlled by the arm 118 on the shaft 102. To unlock the starting-bar and control keys the usual decimal slide 117 is manipulated a cam A thereon being adapted to move a slide bar 131 rearwardly which, through a crank 130, rocks a shaft 129 having arms engaging the arms 114,118 to restore the locking mechanisms to inoperative position. Ink-ribbon mechanism.-The ribbon vibrator 137 is operated in the usual manner by the lever 138 through the depending arm 143 and one or other of the studs 141, 142 on a bell crank 34 connected with the main operating mechanism whereby the overdraft is printed in a distinctive colour. The shifting of the arm 143 is effected by a link 144 connected by a leaf spring 145 to an adjustable hub 35 on the shaft 129. To an arm C on the shaft 129 is attached a link 161, Fig. 1, which is connected at its forward end to a bell crank 160 having a pin and slot connection with a link 163 pivoted to a lever 164. Underlying the lever 164 is an arm of a bell crank 165 the other arm of which is provided with a hook 166 engaging a pull strip 167, Fig. 5, having a turned-up end 168 adapted to co-operate with a fixed abutment 169. The carriage rack bar 170 is provided with adjustable stops one of which viz. 172 is set to a credit column position and is normally inoperative. When the operator presses on the finger lever 173 and moves the carriage to the credit column position the toe of the stop engages the end 168 of the pull strip 167 and through the linkage described causes the shaft 129 to rock whereby the arm 143 is shifted to effect the printing of the credit item in the distinguishing colour.