Patent GB-191501496-A (GB)
Title: Improvements in or relating to Platen-carriages for Typewriters and the like.
IPC: B41J11/22
Filed: 1915-01-29
Abstract: 1496. Etheridge, H., and Bar-Lock Typewriter Co. Jan. 29. [Addition to 27,628/12.] Letter - spacing mechanism; back-spacing mechanism; carriage brakes; carriage stops; line locking devices; alarms. - The detachable carriage-holder described in the parent Specification is i m - proved by mounting the escapement mechanism, as well as the driving- mechanism, on the carriage-holder; the backspacing, brake, margin, alarm, and like mechanisms which co-operate with the carriage may also be mounted on the carriage - holder. The arrangement enables the mechanisms co-operating with the carriage to be adjusted while the carriage - holder is detached from the machine; further, the carriage is prevented by the escapement from being moved by the driving - mechanism when the carriage - holder is detached. The carriage - holder may be provided with the attachment devices described in Specification 20,411/13. (1) The base-plate B' of the cradle A, which carries the driving-barrel B, is extended to carry the escapement mechanism comprising the usual dogs D engaging an escapement-wheel C provided with a pinion C', which engages the feed-rack. The dogs D are mounted on a frame D' on the base-plate and are formed with a tail D<2> engaging a universal bar. (2) The back-spacing pawl E is pivoted to a link E<2>, which is pivoted at E<3> to the base-plate, the pawl being connected by a link E<4> to a rock-shaft E<6>, which is mounted in the cradle A and is operated by a handle. The pawl is adapted to engage the pinion C<1>, but is normally held clear by a spring E<7>. (3) The usual spring- retarded brake-pinion F, adapted to be swung into engagement with the feed-rack, is journaled in a frame F<2>, which is pivoted on a stud F<3> secured to a part of the base - plate. (4) A stop-member G is mounted by a slot on a pin G<1> on the cradle A, and is formed with a lug G<Î> adapted to engage the margin stop on the carriage. The member G engages a pin H<3> on a paragraph-stop member H, which is pivoted at H' on the cradle and is formed with a stoplug H<2>. On depressing a release - key lever arranged under the member G, the lug G<Î> is depressed, and the lug H<2> is raised into the path of the margin-stop. (5) A locking-rod J is mounted in the sides of the base-plate and, on being advanced, engages beneath the universal bar and locks the machine. The rod is connected to a lever J<1>, which is pivoted at J<2> to the base-plate and is engaged by a lug J<4>, Fig. 6, on a lever J<3>, which is pivoted at J<2> and is formed with an arm J<5> adapted to engage an arm G' on the member G when the member is moved by the margin stop. The levers J<1>, J<3> are connected by a spring J', and the lug J' is held against the lever J' by a spring J<7>. If the universal bar is in the depressed position when the member G is operated, the rod J is obstructed, and the spring J<6> yields to take up the movement of the lever J<5>. On elevation of the universal bar, the spring J‹ advances the rod. (6) The bell K is mounted on the base-plate and the hammer K' is pivoted on the cradle, an arm on the hammer being tripped by the carriage.