Patent GB-237448-A (GB)
Title: Improvements in carriage-feeding mechanism for typewriting machines
IPC: B41J19/46
Filed: 1924-09-10
Abstract: 237,448. James, R. W., (Remington Type. writer Co.). Sept. 10, 1924. Letter-spacing mechanism; space-key actions. -The escapement mechanism for letter-spacing comprises two separate escapement wheels controlled bv dog rockers which are actuated by the universal bar and space key respectively, the former producing a carriage movement on the upstroke of a character key, and the latter producing a further movement of the downstroke of the space key, the object being to ensure correct spacing between successive words. The carriage rack 46, Fig. 1, is supported on a frame 44 pivoted to the carriage, and meshes with a feed pinion 47 mounted loosely on a shaft 48, which is supported at its ends in a U-shaped yoke member 49, Fig. 9. One-way connection between the loose pinion 47 and the shaft 48 is provided by a spring-pressed pawl 63 pivoted on a disc 65 secured to the shaft. The escapement wheels 70, 71 are secured upon the hubs 75, 81 of bevel wheels 74, 80 looselv mounted on the shaft 48 and engaging a bevelled pinion 90 mounted between them on an arm or carrier 83 clamped upon the shaft 48, forming a differential gear. The dog rockers 91, 111 co-operating with the escapement wheels 70, 71 are pivoted in a U- shaped yoke 53, Fig. 8, secured within a space 2a in the top plate 2 of the machine. The rear rocker 91 carries fast and loose dogs 104, 99; the loose dog 99 normally engages the escapement wheel 70 and is held against a stop 101 by the force transmitted to the wheel by the carriagedriving spring. The loose dog is released in known manner when a contact face 21 on a typelever 7 strikes the universal bar 22 and operates an arm 24 pivoted to the lower end of the rocker, the release taking place on the upstroke of the character key 20. Reverse rotation of the escapement wheel 70 is prevented by a back stop 138, Fig. 8. The space key lever 34 is connected by a link 37 to a two-armed lever 130, 131 pivoted at 132 to the yoke 53, the upper end 135 of the arm 131 being normally in contact with a screw 136 in the front rocker 111. The front rocker carries a fast dog 119 normally engaging the escapement wheel and a loose dog 123 normally held in contact with a stop by a spring 124 connected between the dog and the screw 136. Reverse rotation of the escapement wheel 71 is prevented by a stop 141 on the end of a spring- pressed pivoted arm 139 which allows the teeth 73 of the wheel to slip past during forward movement only. The front and rear dog rockers are connected at their lower ends by a spring 110 which normally serves to hold adjusting screws 128, 108 in the rockers against a stop 109. In the event of the space key being depressed quickly following the depression of a character key, the front rocker, controlled by the space key, acts first and produces a carriage movement which is followed bv the normal movement resulting from the upward movement of the character key. Further, if the actuation of the keys is such that the escapement wheels 70, 71 are released simultaneously, the pinion 90 acts substantially as a rigid member, transmitting motion from the shaft 48 to both escapement wheels and producing the requisite movement of the carriage.