Patent GB-168135-A (GB)
Title: Improvements in typewriting machines
IPC: B41J11/14
Filed: 1920-05-20
Abstract: 168,135. James, R. W., (Remington Typewriter Co.). May 20, 1920. Carriage-shift mecha n i s m ;shift - key actions.-In carriageshift machines the shift frame consists of two sheet-metal sections, of which the first is provided with a shift mounting, and the second is detachably secured to the first and supports the paper-carriage and associated devices, such as the spring drum, escapement, and alarm, the arrangements enabling the paper-carriage and associated devices to be detached as a single unit. The invention is shown in Fig. 1 applied to a portable top-strike machine of the kind described in Specification 159,705, and having framework comprising an outer frame 1, and an inner frame consisting of side plates 3 which are secured to the outer frame and are connected by a comb 4 and other cross-members. According to the invention, the shift frame is formed in two sections 5, 6, the section 6 consisting of side bars 7, and the detachable section 5 consisting of a cross-bar 16 formed with arms 17, Fig. 5, which are secured by screws 19 to arms 8 on the side bars and have flanges 18 engaging the edges of the arms 8. The paper-carriage 27 runs on rails 22 which are secured by screws 23 to the arms 17. The bars 7 are supported on the plates 3 by means of links 10, 14, the links 14 being pivoted to ears 12 on the bars. A shift-key lever 91 is connected by a bell-crank 96, pivoted at 97 to one of the plates 3, and having pin-and-slot connection 99 to one of the bars 7. Returning-springs 96<a> are connected to the ears 12. The shift frame is held in the normal position by means of a bellcrank 100 formed with a hook 105 for engaging the pin 99. When the shift-key lever is depressed, a cam-slot 104 therein engages a pin 102 on the bell-crank and releases the hook. The shift frame is arrested without shock by the engagement of stationary stops with a sheet-metal stop 108 of closed skeleton form secured to the bar 7 ; as shown, the stop is triangular and is formed with wings which are secured by rivets 109 to the bar. The inclined faces 110 of the stop co-operate with adjustable stops 111 consisting of pivoted plates secured by screws 113 passing through slots 114. Shift-key locks.-A locking-key 120, Fig. 1, pivoted on a bracket 117 is formed with an arm 121 for engaging a lug 115 on the shift-key lever 91. The lock is released by a slight further depression of the shift-key lever, a spring 122 then returning the locking-key. Letter-spacing mechanism; space-key actions. -A spring-drum 29, Fig. 1, mounted on the cross-bar 16 of the detachable section 15 operates a band 31, passing over a pulley 32 on one of the rails 22 and connected to the paper-carriage. A detent 34 on the cross-bar engages a ratchet-wheel 33 in connection with the spring drum. A rocker 45, provided with escapement dogs 43, 44 co-operating with a rack 36 on the paper-carriage, is secured to a rock-shaft 47 trunnioned in ears 49 on the detachable section 5. Arms 50 on the rook-shaft are operated, as described in Specification 159,387, by a universal-bar frame 53, and arms 57 engaging the space-bar levers, the frame 53 and arms 57 being pivoted to ears 55 on the section 6. The arms 50 have hooked ends and pins 51, engaging pins 52 on the universal-bar frame, and slots in the arms 57 respectively, the arrangement enabling the parts to be separated readily when the shift frame is detached. The feed-rack 36 is secured to arms 37 which are pivoted to brackets 38 on the paper-carriage and are urged upwards into contact with stops by springs 37. Margin stops; line-locking devices; alarms.- The detachable section 5 supports margin-stop, line-locking, and alarm mechanisms, preferably of the construction described in Specification 168,166. Ink-ribbon mechanism.-Ink-ribbon mechanism is supported on the section 6. As shown in Fig. 1, the mechanism is of the construction described in Specification 166,775, and comprises spools 61 and a longitudinally movable driving-shaft 64 mounted on ears 63 on the section 6, the shaft being provided with a ratchet-wheel 64 driven by a pawl 71 on a rocking arm 72 operated by an arm 75 of the universal-bar frame 53.