Patent GB-373157-A (GB)
Abstract: 373,157. Typewriter calculating- machines. TRICGS, W. W., 57, Lincoln's Inn Fields, London.-(Elliott-Fisher Co. ; Cedar Street, Harrisburg, Pennsylvania, U.S.A.) Feb. 17, 1931, No. 4985. [Class 106 (i).] In a typewriter adding and subtracting machine having a column and a line totalizer and a master wheel associated with each totalizer, each master wheel is provided with reversible gearing, automatic reversing means being provided for the line totalizer master wheel and manual reversing means for both master wheels. The invention is shown as applied to the Elliott-Fisher machines described in Specifications 262,919, 266,469, and 267,045, [all in Class 106 (i), Calculating &c.] The column totalizer is actuated by a master wheel 4, Fig. 2, driven through reversing gearing from a shaft 10 which has a differential motion imparted to it by key-actuated segments 24 gearing with sectors 23, Fig. 4, each carrying a pawl 21 actuating a ratchet wheel 20 secured to the shaft 10. The reversing gearing comprises a broad pinion 30 secured to the shaft of the master wheel and engaged by a narrow pinion 31 slidable along a shaft 33 by a gear shifter 34. In one position of the shifter 34 a wheel 32 on the shaft 10 drives the pinion 31 directly while in the other position the pinion 31 engages a pinion 35 driven by the wheel 32. The line totalizer 6, Fig. 1, is actuated by a master wheel connected to the shaft 10 through reversing gearing operated by a lever 40 mounted on a shaft 40a. If the line totalizer and the particular column totalizer being actuated are both set for addition, the depression of the subtraction key 59, Fig. 2, pivoted at 58 rocks a shaft 54 and moves a bar 50 to the right. This bar is connected at 52 to the gear shifter 34 and the column totalizer is thus set for subtraction. The bar 50 is also connected at 51 to a lever 44 which, when the bar is moved to the right, swings about a pivot 45 and causes a projection 42 to ride up a cam slot 43 and rock a lever 41 connected to the reversing lever 40, the line totalizer then being set for subtraction. An error may thus be corrected by changing the sign of the operation and re-entering the same item. Means are also provided whereby the line totalizer may be actuated in a direction opposite to that of a column totalizer, these means being automatically controlled by the carriage. If the line totalizer is adding, the arrival of the carriage at certain positions causes a lever 62 to contact with a stationary stop 64, a link 61 then being moved to the left to rock a lever 49 freely pivoted at 40a. This draws to the right a slide 46 carrying the pivot 45 of the lever 44 and causes the latter to swing about the pivotal connection 51 and to set the line totalizer for subtraction. If the subtracting key 59 is now depressed (e.g. to correct an error) the movement of the bar to the right reverses the column totalizer and swings the lever 44 about the pivot 45 to restore the line totalizer to an adding condition. The depression of the subtraction key 59 causes type of a distinctive character to be presented to the printing line. A projection 73 on the key lever 59 swings the cam end 72 of a lever 71 to bring a projection 69 into the path of an arm 70 fixed to the typehead 66. The latter is thus turned to change the kind of type which shall make the impression.