Patent GB-107207-A (GB)
Title: Improvements in Combined Typewriting and Computing Machines.
Inventor: FAIRWEATHER HAROLD GEORGE CRUI
IPC: G06C11/04
Filed: 1916-03-22
Abstract: 107,207. Fairweather, H. G. C., (Underwood Computing machine Co.). March 22, 1916. Adding-apparatus.-Machines of the key-set independently-operated type described in Specifications 5557/06 and 12323/13, employing the numeral keys of a typewriter, and having keys to print special characters, such as a sign to show error correction or zeroizing of the counters, are so modified that depression of a special key serves to trip a spring by which the actual printing is accomplished, means being provided to ensure return of the printing mechanism to normal before further operation and to prevent depression of any of these keys unless the setting of the machine is appropriate. The machine described is of the Underwood-Hanson type in which alphabet and numeral keys 1, 2, Fig. 1, swing type-bars 4, having lower and upper case type 6, 7, against a platen 5 mounted on a carriage 8. A platen shift key 10 operates through an arm 11 and bell-crank 12 to raise the platen by means of a wheel 14 carried by the platen frame 15 and running on a rail 16 on the bell-crank 12. As the carriage 8 travels, a tappet 19 successively raises jacks 20, pivoted at 21, which, operating through rods 26, pivoted levers 27, and a transposition device 30, serve to elevate in turn bars 23, having pins 24 which may be operated on by setting-bars 25; actuation of a numeral key 2 depresses one of the bars 25 together with the corresponding pin 24 on the bar 23 which is raised. A bar 35 is then moved forward by the general operating handle 41, and by means of the pins 24 which are depressed draws forward the bars 23 to actuate the counters 34 through racks 36 and pawl-and-ratchet pinions 37; the counters are alined by spring detents 46 engaging teeth 48. The handle 41 also operates, through a sector 42 and pinion 40, a pair of racks 39 by one of which a shaft 68, Figs. 1 and 3, for operating the transfer mechanism 43, is. driven through a pinion and one-way clutch 69. The bars 23 are restored by a cross-bar 44, and the pins 24 by a plate 50 mounted on two belt-crank levers 57 and lifted by a catch not shown. Distinguishing-marks; error keys and the like.- A key 53 is provided to print a star when the counters stand at zero; this key releases a spring 57 by depressing an arm 66 to rock a spindle 67, having a detent 58 which bears underneath a pin 64 on a link 63, hanging from a pivoted lever 62 to which the spring 57 is attached. Pivoted to the same rock-shaft 61 as the lever 62 is an arm 60 which by a link 59 draws down a lever 3, adapted to operate a special type-bar 54 having a star type 6. This mechanism is restored and the spring 57 retensioned by a cam 70 on the shaft 68 which bears on a lug 72 on the lever 62. If the counters do not stand at zero, a lug 78 on the key 53 will encounter a bail 77 pivoted at 47 -and pressed by a spring against the detents 46. In the zero position however a specially-formed depression between two of the teeth 48 allows the detents to penetrate further so that the bail 77 is removed from the path of the lug 78. The error-correction key 81 operates the plate 50 by means of a lever 105 pivoted at 106, and connected to a lug 107 on the key 81 by a spring 108. Movement of the lever 105 is prevented until the spring 108 is stretched by a bell-crank lever 109, which bears underneath the lever 105 but is tilted at the end of the stroke of the key 81 by the lug 107. The key operates the type-bar 54, having an error-correction sign 7, by means of an arm 83 in a manner similar to that for printing the star type. The case shift key 10 also is operated by a projection 84 striking an arm 92 to rock a spindle 93, and thereby, by means of a crank 94 and link 95, to slide a guide 90 having a slot-engaging notch 91 in a link 86 which embraces the key 10. The notch being disengaged, the link is drawn down by a spring 87, restoration being by a cam plate 102 on the rack 39 contacting with a roller 104 on the link 86.