Patent GB-191418225-A (GB)
Title: Improvements in Typewriting Machines.
Inventor: ANDERSON NILS HJALMAR
IPC: B41J1/08
Filed: 1914-08-01
Granted: 1915-07-01
Abstract: 18,225. Anderson, N. H. Aug. 6, 1913, [Convention date]. Type-bar actions.-The type-carrier is moved through the greater part of its stroke into a position adjacent to the platen by the keylever, and the stroke is then completed, independently of further operation of the key-lever, by a pivotally-mounted momentum-accumulator or weight arranged in the action between the key-lever and the type-carrier. The action may be arranged so that the key-lever is positively arrested before impression occurs, and the typecarrier is caused to recede slightly after impression to prevent blurring, even if the keylever is held depressed. As applied to a machine in which sliding type-bars 5 are operated by toggles 12, 15, the momentum-accumulator 23 is secured to a link 22 which is pivoted to an arm 21 on the lever 15 and is also pivoted to the arm 24 of a bell-crank, the key-lever 4 being connected by a link 33 to a lever 30 which rides on a curved arm 27 of the bell-crank. On depression of the key-lever, the momentumaccumulator, which normally rests on a pad 64, is swung to the rear until the key-lever is arrested by the engagement of an arm 40 with a stop 38, the parts being in the position shown. The impression-stroke is completed by the momentum-accumulator passing over the deadcentre and straightening the toggle 12, 15 and the reverse-toggle 22, 24. During the depression of the key-lever, the point of contact between the lever 30 and the arm 27 moves towards the pivot 25 of the bell-crank, thereby affording an easy start for the key-lever. The type-bar is caused to recede slightly by the action of a returning - spring 52 secured to the bell - crank and by the rebounding of an arm 26 on the bell - crank from a semi - resilient stop 29. To prevent jarring of the finger, the key-lever 4 is made relatively light and is secured to a heavier part 35 formed with a part 40 to engage the stop 38. The upward movement of the key-lever is limited by a stop 41. To facilitate assembling, the levers 30 are formed with open ends 31, and the common pivot-wire 32 is formed at the rear with a flat. The pivots 13 between the levers 12 and the type-bar are secured to a spherical member 13<Î>, Fig. 8, which can be slipped into an aperture in the type-bar, a notch 9 in the member engaging a flat in the aperture. The member 13<Î> permits slight free play between the lever and the type-bar. The lever 12 consists of two sides connected by a pin 14 and adapted to be sprung apart to pass on to the pivots 13. Each lever 15 and the associated bell-crank 24 are carried by a bracket 16 which can be adjusted by a screw 18. The brackets are secured by clamping-screws 20 which engage adjacent brackets. The plate 7 that supports the type-bars is made of nickel alloy and is cut away at 100 to provide a short bearing 101 for the front ends of the type-bars, the rear ends being supported on a plate 102 formed with dust-collecting grooves 103. Keys.-The returning-springs 43 for the keylevers are adjustably secured at one end to lugs 44 and at the other end to a plate 45 connected to a link 46 which passes through a fixed bar 47 and carries a nut 48 for adjusting simultaneously the touch of the key-levers. The touch can also be adjusted by varying the tension of a spring 63 carried by a link 58 which connects the universal bar, described below, to the escapement. The link passes through the bar 47 and the comb 42 and carries at the front a self-locking nut 61, and the spring is arranged between the bar 47 and a self-locking nut 62, the tension of the spring and consequently the touch being adjustable by means of the nuts. Letter-spacing mechanism.-The universal bar 50 is mounted at the top on three parallel links 53 and at the bottom on three parallel links 55 secured to a rock-shaft 56 connected by an arm 57 and the link 58 to the escapement. Each of the arms 27 of the bell-cranks carries a pivoted fork 51 which straddles the universal bar, the fork engaging and operating the universal bar during the final part of the impression-stroke. The initial position of the universal bar is adjustable by means of the nut 61.