Patent GB-190801809-A (GB)
Title: Improvements in Typewriting Machines, relating particularly to Tabulating Mechanism
Inventor: FAIRWEATHER WALLACE
Filed: 1908-01-27
Granted: 1908-12-03
Abstract: 1809. Fairweather, W., [Underwood Typewriter Co.]. Jan. 27. Typewriters. - Relates to tabulating-mechanism for typewriters. Keylevers 4 pivoted at 5 are connected with rods 7, formed at their upper ends with denominational stops 8. The lever connexions 6 work in parallel slots in the bridge-piece 10 of a bracket 9, andare arranged at letter-space intervals. The levers 4 diverge to the pivot 5, where they are again arranged parallel to one another and then diverge to the front of the machine. The upper ends of the rods 7 are guided between plates 17, 18 screwed to the bracket 9. Arms 22, 23 extending forward from the bracket are perforated to fit over studs 26, and are provided with screws 27 which rest upon the framework 24, 28. Screws 29 in the bracket abut against the part 24 and coned screws 30 bear upwards against the front bottom edge of the bracket. Adjustment of the various screws enables the stops 8 to be brought into register with the column stops. Arms 34 extending from the bracket support the pivot rod 5 and have adjustable screws 35 bearing against the frame 36. The column stops 41, 42 are forked to bestride a notched bar 38, Figs. 11 and 13, and are held in place by a bar 46 hinged to ears 47 on the bar 38 and pressed downwardly by a spring. The stops may be set with either fork upwards, and the sides of the forks are bevelled, Fig. 2, so as to co-operate with the bevelled ends of the stops 8 and allow the more ready return of these stops to their inoperative position under the influence of springs 71. The stop-bar 38 is adjustable lengthways on supporting-arms 50 by a screw 51, 52, Fig. 13, upon which is a lock-nut 54. Screws 55 in the bar 38 pass through slots in the arms 50 and serve to fasten the bar after its adjustment. The carriage 33 is connected by a strap 57 to a spring drum 58, and is letter fed by a pinion 60 engaging a pivotally supported rack 59. The carriage is released, when a tabulating-key is depressed, by the engagement of shoulders 68 on the stopbars 7 with a universal bar 69 so as to operate links 65, 66 to rock a lever 62, a roll 64 upon which raises the rack 59 out of mesh with the pinion 60. Rotating in a casing 75, which is secured to the rock-shaft 67 of the universal bar 69, is a shaft 78 to which is attached an arm 85 carrying pivoted weights 84. When the universal bar 69 is raised, the pinion 77 is thrown into mesh with a bevelgear on the spring-drum 58, and the consequent outward swing of the weights 84 causes a loose disk 87 to be forced upwards against a loose washer 88 of fibrous or other material and prevents the speed of the carriage from exceeding a certain limit. The cross-arm 85 is bevelled along its upper edges, and at the beginning of the carriage run, strikes projections, preferably bevelled, depending from the disk 87, so as to press_up and rotate the disk thus producing some degree of frictional pressure before the centrifugal braking action takes place. The arm 85 is adjustable upon the shaft 78.