Patent GB-191211644-A (GB)
Title: Combined Typewriting and Computing Machines.
Inventor: ALLARD J FRANK
Filed: 1912-05-16
Granted: 1913-01-09
Abstract: 11,644. Allard, J. F. July 1, 1911, [Convention date]. Adding-apparatus; attachments to typewriters; operating by motors; selecting denomination. - A typewriting and computing machine in which the item is first set and then by a subsequent operation the rotation of the computing-wheels is effected to add such set item, is provided with an electric motor, the circuit of which is normally open, but is adapted to be closed upon a certain movement of the typewriter carriage, or upon the depression of a special key at any desired time. The depression of a numeral key 1 throws up a type-bar 5 to print the corresponding numeral, and through a universal bar 9 actuates the carriage-escapement to move the carriage through one step. Upon the carriage rack-bar 14 is mounted an adjustable tappet 13 adapted to engage in succession the ends of denominational levers 15, which depress links 18 to rock levers 19 and thereby raise the ends of rackbars 21, the forward ends of which engage the totalizer pinions 24. At the same time, the raised rack - bar is engaged by a cross-link which has been depressed by the numeral key and thus depresses one of a series of pins mounted in the rackbar. The rack-bars fall to their normal position to bring the depressed pins into the path of a cross-bar 29 of the reciprocating operator, which comprises arms 30 and a pair of racks 31. A yoke 59 is secured to one of the racks 31, and is engaged by a grooved member 55 in which slides a block 53 pivoted to a crank arm 52 mounted on a spindle 51 rotated by the motor 47. The motor circuit is completed after the units digit of an item has been set by means of the tappet 13 engaging a special-denomination lever 36, which is adapted to rock a bell-crank lever 39 to press forward a pivoted switch-bar 44 mounted on an insulated plate 46. During the forward stroke of the member 55, a lever 68 is rocked by means of the action of a spring 70 of a bell-crank lever 73. The arm 71 of the bell-crank lever is formed in two parts 71, 75 pivoted at 74 and the relative movement thereof is limited by stops 76, 77 so that, on the return of the member 55 to normal position, an insulated roller 78<a> on the part 75 engages a cam-edge 79 of the switch-bar 44 and breaks the circuit. To prevent overrunning of the motor, a brake 80 is provided which is faced with leather or a fibrous material adapted to engage a like material on the wheel 85 of the motor. The brake is operated by a solenoid 86, the circuit of which is closed bv the movement of the switch-bar 44, which is forced up on to a contact 91<a> as the motor circuit is opened. The solenoid circuit is opened at the end of the movement of the core by means of a cam 92 engaging an ear 43 on the switch-bar to disengage it from the contact 91<a>. The switch-bar is held in its normal position by a detent 94. A special key 100 is adapted to rock a lever 103 to depress a finger 104 which thereby swings a lever 108 to rock the switch-bar to complete the motor circuit. On the spindle of the denominational levers 15 is mounted a button 163 which has an eccentric part adapted to raise the special lever 36 to an inoperative position to disable the motor-operating mechanism.