Patent GB-198839-A (GB)
Title: Improvements in actions for typewriting machines
IPC: B41J7/02
Filed: 1922-03-29
Abstract: 198,839. Hess, E. B., and Royal Typewriter Co., Inc. March 29, 1922. Type-lever actions.-A noise-reducing action comprises a two-armed lever connected to the type-lever and key-lever and arranged so that full depression of the key-lever moves the type-lever into proximity to the platen, and the stroke of the type-lever is completed by momentum. In the action shown in Fig. 1, the two-armed lever consists of a bell-crank L having a long arm in engagement with the slotted heel h of the typelever II and a short arm connected by a link P to the key-lever G. Full depression of the key-lever moves the type-lever rapidly to the position X, the link being then in the dead-centre position, and the type-lever is thereafter moved by momentum in the manner described in Specification 182,427. The two-armed lever may consist of a bell-crank having forwardly-directed short and long arms, the short arm being slotted to engage a pin on the key-lever, and the long arm being connected to the heel of the type-lever by a link which comes to the dead-centre position when the keylever is fully depressed; or bell-cranks at the rear of the type-levers may have horizontal arms engaging the key-levers, and vertical arms connected to the heels of the type-levers by links which come to the dead-centre position when the key-levers are fully depressed; or short straight two-armed levers, pivoted on a straight rod arranged below the type-heads, may be connected to the type-levers and key-levers by links which come to the dead-centre position when the keylevers are fully depressed. In the action shown in Fig. 5, bell-cranks L are connected to the key-levers G and type-levers II by links P, L<1>. The type-levers are mounted on an inclined segment C, and lull depression of the key-levers . moves the type-levers to the vertical position, the links being then in the dead-centre position, and the stroke of the type-levers is thereafter completed by momentum. In the action shown in Fig. 6, type-levers H, pivoted on a verticallyshiftable segment C, are connected by links e<8> to two-armed levers Z<8> which are pivoted on a stationary segment Z<9> and are connected by links d<9> to levers D<8>, connected by links d<8 >to the keylevers G. The key-levers and levers D<8> are pivoted on stationary frames J, c<9>. The links d<9> come to the dead-centre position when the key-levers are fully depressed. Specification 198,840 is referred to. Keys.-Returning-springs n, g, Fig. 1, for the levers Land key-levers G are connected to a pivoted support N which can be rocked by means of a screw O to adjust the touch of the keys. Case-shift mechanism; shift-key actions.-The segment C, Fig. 6, is provided at each side with a post Q<6> passing through nuts S<6>, T<8>, mounted in a lug r<6> and a nut M<8>, mounted in a lug r<11>. A. spring P<6> on the post is adjustable by the nut S<6>, and the post is provided with a collar n<8> for engaging the nuts T<8>, M<8>. The posts have pin- and-slot connection with arms W<8> on a shaft X<8> which is rocked to depress the segment by means of shift-key levers B<9>. Letter-spacing mechanism.-The mechanism is operated by the above-described actions during the latter part of the stroke of the type-levers, preferably during the momentum stroke. A universal bail q, Fig. 1, secured to a frame Q, is actuated during the momentum stroke of the type-lever by cams h<1> thereon. The frame Q is supported at the front by a finger q<1>, and at the rear by a rocking arm s, a finger r on the frame engaging, in either the normal or shift position of the carriage A, a roller f on the dog rocker u<2>. A returning-spring s<3> for the universal bail is V provided with an eccentric S<2> for moving the arm s to adjust the tension of the spring. The roller f is carried by a spring arm f<1> adjustable by means of a screw f<2>. An adjustable returning- spring u<5> for the dog rocker is arranged between collars u<3>, u<4> on a screw u secured to a bracket U<1>. In the above-described action comprising bell-cranks engaging the key-levers, the vertical arms may engage a padded universal bail secured to a horizontally-movable frame mounted on rocking arms, a on the bail having lostmotion engagement with the dog rocker. In the above-described action comprising straight twoarmed levers, a universal bar under the key-levers rocks an arm arranged to operate the dog rocker during the latter part of the stroke of the keylevers. In the action shown in Fig. 5, the links L<1> carry links B<2> formed with hooks b<5> having lost-motion engagement with a universal bar b<2> carried by rocking arms b, the universal bar being operated during the momentum period of the type-levers. In the action shown in Fig. 6, a universal bail F is operated by the levers Z<8> during the momentum period of the type-levers.