Patent GB-232505-A (GB)
Title: Improvements in carriage-returning mechanism for typewriting machines
IPC: B41J11/24
Filed: 1924-10-14
Abstract: 232,505. Fairweather, W. C., (Underwood Typewriter Co.). Oct. 14, 1924. Carriage-returning mechanism ; electric driving-mechanism.-In arrangements comprising a carriage-driving motor mounted independently of the typewriter, the motor is mounted in an elevated position on a rearward extension of the support of the typewriter; the motor may be adjustably mounted and its shaft may be detachably connected to the shaft of a transmission gear which is mounted on the typewriter and adapted to drive a shaft glared to the carriage. As applied to a machine of the continuous billing class, the motor 51 is mounted on a rearward extension of a table 152 which supports the typewriter 58 and is provided with a bracket 151 supporting the web-table 149 at the rear. Posts 157 secured to the rearward extension of the table 152 support a bracket 161, and the motor-casing is formed with ears 165 pivoted on a bolt 164 which is mounted in a. block 163 on the bracket and is provided with nuts 166 for securing the motor-casing in adjusted position. A block 82 secured to the typewriter in the manner described below contains a gear 89, Fig. 4, and a worm-shaft 77, the hub 91 of tha gear being mounted on a ball-bearing 92, and wormshaft being arranged to abut on a ball 88. The block contains oil and is closed by a detachable plate 102. The motor-shaft 75 is provided with a cross-pin 80 fitting loosely in a. cross-cut 81 in a sleeve 76 on the worm-shaft, the device coupling the shafts without necessitating exact alignment. The block is secured to posts 110 secured to a bracket 108 which is secured to one of the rear posts of the typewriter. The motor is connected by a lead 74 to box 73 secured to the typewriter and provided with terminals 167, and a switch operated by a slide 72. The carriage 11 is provided, in addition to the feed-rack 16, with a carriage-returning rack 121 which engages a broad pinion 120 on a shaft 101 mounted in the hub of the, gear 89 and a bracket 106 secured to the bracket 108. The shaft is movable longitudinally, to move a clutch-member 99 thereon into or out of engagement with a clutch-member 93 on the hub, by means of an arm 137 on a rock-shaft 136 operated by mechanism controlled by the margin stops, the mechanism serving also to operate the switch-slide 72. The mechanism comprises a link 60 connected to a rock-shaft 65 which is connected to the rock-shaft 136 and is provided with an arm 66 operating a slide 68 connected by a spring 69 to the slide 72. The link 60 is urged rearwards by a spring 61, but is normally locked by engagement of a comb 63 with a notch 62. When a line is completed, a rail 52 carrying the left-hand margin stop depresses a link 53, and a lever 56 releases a link 60, which thereupon moves rearwards to initiate carriage-return by closing the switch and moving the clutch-member 99 into engagement. The movement continues until the right-hand margin stop is engaged, whereupon a shaft 142 is rocked and by means of linkage 144, 145 rocks the shaft 136, thus releasing the clutch-member 99 and opening the switch. The carriage, is returned from mid-line positions by depressing a key 168 carried by a bell-crank 170 abutting on member 171 which is pivoted on the link 60 and permits return of the key independently of the link. Line-spacing mechanism.-The carriage-returning rack 121 has a pin-and-slot mounting 124, Fig. 2, on the carriage 11, and engages an arm 131 on a rock-shaft 129 which is mounted on the carriage and is provided with a fork 128 engaging a pin 127 on the line-spacing slide 126. Tabulating-mechanism. - The carriage-returning shaft 101, the pinion 120, and clutch-member 99 are so disposed that the tabulating-stops 45 can be shifted from one end of the usual rocking stop-frame 35 to the other without being fouled by the pinion or clutch-member. In some cases the bottom cross-bar 34 of the stop-frame is cut away at the lower edge 148 to accommodate the shaft.