Patent GB-190700392-A (GB)
Title: Improvements in or relating to Typewriters
Inventor: BRIGGS HERBERT ARIEL
Filed: 1907-01-07
Granted: 1907-05-23
Abstract: 392. Briggs, H. A. Jan. 7. Typewriters.-R e l a t esto front-strike visiblewriting machines. (1) The type-bar mechanism is arranged on a carriage 12, Figs. 4 and 6, coupled to travel with the platen carriage 7 in the opposite direction. The coupling consists of a triangular frame 14 connected at the apex by a yoke 15 and grooved collar 16 to the platen carriage, and having the base 18 working in guides 19 and attached to tapes 20, 21 connected at diametrically-opposite points to a spring drum 22, which is connected by other tapes 26, 27 to the carriage 12. The escapement-wheel 120 carries a pair of pinions 122 meshing with a double rack-bar 123 on a spring-controlled frame 125, pivoted on the type carriage 12 and operated by a release lever 126, Fig. 8. The dogs 133 are carried by a frame 129 engaged at 134 by the universal bar 135. The margin stops 31 co-operate with the type carriage 12, and are adjustable along racks on the base and provided with pointers moving over slotted scale plates 34 having alternating graduations on opposite sides of the slot. The platen 39 is counterbalanced by arms 42 on a spring - tensioned rock-shaft 41, the spindle is guided in slotted uprights, and the shift lever carries a roller 49 riding upon a bearing-rail 50 on the side arms 51 of a spring-supported frame 52 operated by left and right hand shift keys. The line - spacing pawl 144 is carried by a spring-retracted slide 143, having a stud 142 engaged by an arm 141 of a spring - retracted rocking frame 140, which carries a bearing- rail 146 co - operating with a roller 147 on a pull -rod 148 connected with a rock-shaft 150, Fig. 8. At the front of the machine, the rockshaft 150 is provided with fast and loose arms 151, 156, and is actuated by a key 93 through the loose arms 156, the spacing being determined by means of an adjustable stop 153 on the fast arm 151. The ribbon mechanism is carried by the platen carriage, and is driven by bevel-gear 76, 80, 81, Fig. 4, from a rolling gear 83 riding upon a platform 84 pivoted on the type carriage. The platform 84 is tripped to disconnect the ribbon gear on carriage release, through connexions 87, 90, 91, Figs. 4 and 8, with the key 93. (2) The key 93, Figs. 4 and 8, is arranged in proximity to the keyboard, and carries a fast rail 160 for operating the line-spacing lever 156, and a pivoted rail 161, independently operable, for actuating the ribbon - disconnecting arm 91 and the carriagerelease lever 126. The rail 161 is provided with a finger-piece 163 for use as a handle in returning the carriage. (3) The locking-arrangements for the two shift keys are shown in Fig, 12. The keylevers 55, 56 and side arms 51 of the frame 52 are provided with studs 57, 58 and 61, 62 co-operating with latches 59, 60 fast on a shaft 63 returned by a spring 65. The latch 59 for the left-hand key, which effects temporary shift, is provided with a nose to play against the stud 57, as shown, in the upper-case position. The latch 60 for the righthand key, which effects lockiog in the upper-case position, is bevelled so that it returns over the stud 62 and holds down the lever 56 and arm 51, the latch 59 returning at the same time to engage over the stud 58 and under the stud 57 in position for release on operating the left-hand key. (4) The type action is shown in Figs. 4 and 7. The hanger ring or segment 98 is mounted in an upright position at the rear of an horizontal basket opening 94, and is provided at the rear with a yielding retaining-plate 102 permitting insertion and removal of the type-bars 95, which engage on the pivot wire 101 by open hooks 108. An intermediate link 110 is pivoted on the type-bar behind the pivot 101, and has a detachable connexion 111 with an arm 88 of a pull-bar 112, working in a slotted guide-bar 103 and connected by toggle-links 113, 115 to the key-lever 114. In order to provide for the varying distance between the parts 112, 95 and to avoid torsional pull, the arms 88 extend vertically upwards into the plane of the corresponding type-bar and are then offset into that plane. The rear ends of the key-levers 114 are detachably hooked under a fulcrum rod 104 on the member 103, and each lever is provided with an adjustable spring 109. The toggle-links 115 are detachably hooked on a rod 117 and retained by a rod 118, and the forward ends extend slightly between the teeth of a guiding-comb 119. (5) The cancelling and underscoring device is shown in Fig. 9. The yoke 187 carries cancelling and underscoring wheels 173, 172 selected by the platen shift. The rockshaft 164 of the yoke 187 is operated by a bellcrank key-lever formed with gear notches for co-operation with pins 166 disposed eccentrically on an arm 165 on the shaft 164. (6) The paper clamps comprise a pair of pendent spring arms 32. 45, Fig. 4, on a collar 70 adjustable along a flattened rod 69 and secured by a set-screw 28. The paper-holding roller 67 is mounted on the outer arm 45 and projects through an opening in the inner arm 32. The set-screw 28 is provided with a shoulder bearing against the arm 45. The rod 69 is carried in a removable casing 66, containing the platen and supporting the paper guides 68, so that the platen and auxiliaries can be removed as a whole.