Patent GB-159889-A (GB)
Title: Improvements in carriage stop mechanisms for typewriters
IPC: B41J25/18
Filed: 1920-08-09
Abstract: 159,889. Blick Typewriter Co., (Assignees of Roberts, L. R.). Aug. 13, 1919, [Convention date]. Margin stops; line-locking devices. -The margin stops 171, Fig. 1, on the stop rack 170 consist of a channel member embracing the rack, and a substantially square plate 211 pivoted on the channel member at an upper corner 215 and provided at the opposite lower corner with a stop face 212. Near the pivot the plate 211 is formed with a detent to engage the rack. The plate 211 is provided with a handle 216 for tilting it to disengage it from the rack, and with a spring 217 for returning it to normal position. The plate 211 is also provided with a cam surface 213 for returning the co-operating stop 174 on the carriage to the inside of the margin stops when it has been released past the stop. The co-operating stop 174 is pivoted on a rocking carrier 173 connected to a marginrelease key 193, Fig. 2, which operates a rock-shaft 187 provided with a cam 186 for engagement with a lug 185 on the carrier 173. A spring returns the carrier 183 to normal position, determined by an adjustable stop-screw. The stroke of the key-lever is determined by an adjustable stop-screw, on which is located a coil spring for returning the keylever. The stop 174 is engaged in a forked end of a lever 175 for actuating a line-locking bail 176, and is movable in one direction for this purpose, movement in the opposite direction being prevented by a stop 194 engaged by the lever 175. The bail 176 is arranged to swing over the heels 178 of the key-levers, and is provided with a forked leg 179 embracing an upright rod 180 carried by an horizontal red 181 slidable in bearings on the frame, the movement being effected by the lever 175 through a link 184, bell-crank 183, and a second upright 182 carried by the rod 181, the sliding engagement of the parts 182, 183 providing for case-shift movements of the carriage. Springs return the bail and other parts to normal position upon release of the co-operating stop from engagement with the line-lock margin stop, either upon return of the carriage or on operation of the margin-release key. The stop rack 170 comprises a thin narrow plate pivoted by means of integral arms on the ends of the platen carriage so that it can be swung forwardly for adjusting the stops, and normally held down against a central abutment bracket 205 by a spring clip 206; the rack is notched to fit over the bracket. Specification 149,991 is referred to. Tabulating-mechanism; carriage brakes. - The stop-carrier 173, Fig. 1, and rack 170 for the margin stops serve also for tabulating. The tabulating-stops 195 consist of upper and lower arms 218, 219 connected together by a clamping-screw 221 and separated by a spring 223. The upper arm is toothed to interlock with the rack 170. The lower arm is formed with a stop face 220 and is guided on a pin 222 carried by the upper arm. The stop faces are located in a different transverse plane from that of the margin stops, and the stopcarrier 173 is given a corresponding throw, a tabulating-key being provided with similar connections to those of the margin-release key, on the opposite side of the stop-carrier, comprising a lug 197 on the carrier, and a cam 198 on a rock-shaft 199 actuated by the tabulating-key lever 202, the cam being shaped to give the appropriate throw. The co-operating stop on the carrier 173 is an integral lug 196. An angular arm 203, Fig. 2, on the rockshaft 199 engages the carriage-release bail 160 to release the carriage on depression of the tabulating-key, and also acts in conjunction with the bail' as a carriage brake; the braking action is regulated by an adjustable stop-screw determining the stroke of the tabulating-key lever, and hence also regulating the throw of the stop-carrier 173 for tabulating. A coil spring for returning the tabulating-key lever is located on the stop-screw.