Patent GB-162488-A (GB)
Title: Improvements in and relating to letter spacing mechanism for type-writing machines
IPC: B41J19/18
Filed: 1920-03-15
Abstract: 162,488. James, R. W., (Remington Typewriter Co.). March 15, 1920. Letter-spacing mechanism; space-key actions; keys.-In machines in which the dog rocker is connected to a universal bar operated by typelevers, and the space-key operates the dog rocked independently of the universal bar and vice versa, the space-key operates a rock-shaft connected to adjustable means, comprising an arm on the rockshaft, for operating the connection between the universal bar and the dog-rocker; a stop-device for arresting and adjusting the space-key is described. The invention is shown in Fig. 1 applied to mechanism of the kind described in Specification 105,865 and comprising a universal bail 20 actuated by the type-levers 16 and connected to a rock-arm 29 having a pin 31 engaging a fork 32 in a link 33, connected, in the manner described below, to an adjustable member 36 on the dog rocker 8. According to the invention, the spacekey 47 is secured to arms 48 on a rock-shaft 49 provided with an arm 51 carrying an adjustable pin 55 which engages the forked end of a bellcrank 62 adapted to engage a lug 67 on the link 33. The link 33 is formed with a fork 34 engaging a pin 35 on the member 36. The pin 55 is secured to a plate 53 which is pivoted at 54 to the enlarged end 52 of the arm 51, and is adjustable by turning a screw 57 having an eccentric head 58 which engages a radial slot 56 in the plate. The plate is clamped in the adjusted position by the head 60 of a screw which passes through a slot in theplate. Returning-springs 68 may be connected to pins 69 and the arms 48. Preferably however a single spring engaging the bell-crank 62 is employed. This spring may engage the bell-crank and the supporting-bracket 65, and be coiled round a boss on the pivot-screw 63 of the bellcrank; or, as shown in Fig. 13, the spring 79 may have a curved part 80 seated in a V-grooved collar 76 secured by the rivet 77 on which the bell-crank is pivoted, the arrangement enabling the spring to be readily detached. The space-key 47 is arrested noiselessly on the up-stroke and down-stroke, and the dip and normal position of the space-key are adjusted by means of pairs of stops of the following-described construction. The space-key'is provided near each end with a bracket 83 having an outwardly inclined arm 87 for engaging an inclined pad 96 secured to a bracket 88 on the base. The parts 85, Fig. 10, of the brackets strike the parts 96 of the pads to limit the down-stroke, and the arm 87 strike the parts 94 of the pads to limit the up-stroke. The provision of oppositely inclined pads and arms prevents the arms 48 from being moved laterally, and thereby causing rattling, when the space-key is arrested; further, rattling is reduced by providing the comb 70 with wide slots for the levers 48. The brackets 88 are secured to the base by screws 91 passing through slots, and the pads are secured to tongues 92 on the brackets. By moving the brackets 88 towards or away from each other, and by bending the tongues 92, the dip and normal position of the space-key can be adjusted.