Patent GB-190703362-A (GB)
Title: Improvements in Typewriting Machines
Inventor: BURRIDGE LEE SPEAR
Filed: 1907-02-11
Granted: 1907-06-27
Abstract: 3362. Burridge, L. S. Feb. 11. Typewriters. - Relates (1) to margin-stop and line-locking mechanism, (2) to releasable paperfeed rollers and guides, and (3) to variable and disconnectible linespacing mechanism for typewriters. The parts are shown as applied to a Sun front-strike machine, in which the type-bars 4, Fig. 5, operate a universal bar 12, and the platen frame and tracks are moved bodily for case shift. (1) The margin stops 27, 59, Fig. 5, are adjustable along a rack 15 on the platen frame, and comprise a plate 17, Fig. 2, with ears 18 bent over into grooves 19 in the base of the rack 15, and a detent 23 on a spring-pressed lever 22, mounted on screws 20, 21 and provided with a finger-piece 25. The co-operating abutment 28 on the framing is carried on an arm 29, hinged on the shifting frame and having apin-and-slot connexion with the push-rod 34 of a release key 33 returned by a spring 39. The outer edges of the stops 27, 59 are rounded to camthe abutment 28 out of the way when necessary. Stops 40, 41, 61 limit the movement of the carriage after margin release. The stop 27 is provided on the front with an arm 42 bent down and formed with a tappet 43 for engagement with an arm 44 on a horizontal rockshaft 45 movable endways in brackets 46 against the action of a spring 57. The shaft 45 carries two arms 47 with interponents 48 for blocking the arms 49 of the universal bar 12, and is connected to the release key by means of a crank 56 and a slotted arm 55 on the push-rod 34. The arms 47 are slotted over pins 52 on the shaft 45 to allow for the rocking movement of the shaft. The rear edges of the parts 43, 44 are bevelled so that the part 44 is cammed out of the way when returning the carriage. (2) The front feed-rollers 63, Figs. 7 and 12, are carried on a shaft 64 mounted in a grooved portion 65 of a plate 69 extending rearwards to form a paper shelf. The plate 69 is loosely hinged on a rock-shaft 67 and supported by a spring 70. The rear feed-roller 62 is mounted in arms 71, attached to the plate 69 by screws 72 and spring washers 73, and the axis of the roller 62 is nearly coincident with that of the rock-shaft 67, which is cranked around the roller. The rockshaft 67 is provided with a finger-piece 75 and serves to release the rollers 62, 63, for which purpose it is flatted adjacent to the arms 71 and to levers 78 for depressing the shaft 64, the cylindrical portions adjacent to the flatted portions camming away the parts 71, 78 and locking them in the abnormal positions. The front paper guides, comprising rollers in spring fingers 89, Fig. 12, and side guides 93, are carried by yokes 85 adjustable on a rectangular or edged bar 80 and retained by a spring finger 86. The bar 80 is carried by arms 81, 82 hinged on the platen frame and retained either against or away from the platen by doubleacting springs. (3) The throw of the line-spacing pawl 96, Fig. 8, is regulated by a pivoted plate 98 with graduated stops 100, 101, 102 and corresponding notches 103 co-operating with a detent 104. Fig. 14 shows the means for releasing the platen from the line-spacing wheel 95. The wheel 95 is formed with a cone 107 to co-operate with a cone 108 on a hub 109 on the platen shaft 110, and is adjustable in relation to the hub 109 by means of a sliding collar 115 and a thumb-nut 112.