Page:United States patent 1108529.pdf/22

 which will be hereinafter described. The other of those contacts is a contact-strip 224, and both to the elements 222 and 224 are mounted on a block of insulating material 225 (see ) and have suitable electric terminals. The strip 224 is fastened directly to said block, while the switch-lever 222 is pivoted on an arm 226 fastened directly to said block, while the switch-lever 222 is pivoted on an arm 226 fastened to said insulating block, and may be adjusted vertically by a lever 225&prime; and a nut 255&Prime;. The switch-lever has a suitable contact point which is normally in engagements with the coacting contact strip and is held in such position by means of a spring 227. At all times except when the printing-wheel is returned to this normal position these contacts remain in engagement and close the circuit controlled therby but on the return of said printing-wheel to its normal position the finger 221 strikes the arm 223 and shifts the switch-lever away from the strip 224 and momentarily opens such circuit.

The feed mechanism employed may be of any suitable type, and in this machine is driven directly from the motor 26 and is controlled by an escapement device. A second long shaft 228 parallel with the shaft 92 is driven from said motor by connections similar to those for driving said shaft 92. The shaft 228 is mounted in bearings 229 near opposite ends of the base 113. Said shaft has thereon a pulley 230, a hub 231, springs 232 with friction blocks 233, regulating-screws 234, a drum 235, a flat coiled spring 236, a spacing washer or sleeve 237 and a stop 238, all substantially identical with the corresponding parts carried by the shaft 92. These parts serve to maintain the spring 236 under constant tension while the machine is in operation and thereby assure proper movement of the driven shaft 228. The pulley 230 may be operated by a straight belt 239 running from another pulley 240 carried by the armature-shaft of the motor 26. At the opposite end of the shaft 238 from that which carries the driving mechanism just described is a ratchet-wheel 241 which is controlled in its movements by an escapement-lever 242 preferably secured to the armature 243 of an electromagnet 244 constituting the shifting magnet for spacing between letters, words, etc. This lever is pivoted on a post 245 rising from the base 113 and is retracted by a spring 246 substantially in the usual manner. Each time that the magnet 214 is deenergized the escapement permits the ratchet-wheel 211 and the shaft 228 to turn one step and feed the tape 214 a corresponding distance. For the purpose of feeding the tape it is preferably perforated at regular intervals, as shown, and the feed-wheel is in the form of a sprocket-wheel 247 having pins which enter such perforations. The tape 214 passes from the guide-roll 220 under another guide-roll 248 over the sprocket-wheel and under another guide-roll 249, it being prevented from returning under the feed-wheel by a vertical guard 250. The two guide-rolls 248 and 249 are carried by a lever 251 pivoted at its lower end in a bearing 252 on the base 113 and normally holding the guide-rolls in proper working relation with the sprocket-wheel, a spring 253 serving to keep the parts in their operative positions (see ).

The printing-lever also has secured to the free end thereof a block 254 of insulating material the under side of which is stepped (see ) for the purpose of opening and closing alternately a pair of breaks in two electric circuits; which will be hereafter described. When the printing-lever is in its normal or retracted position this insulating block 254 closes the circuit controlled by the contract-strips 255 and opens the circuit controlled by the contact-strips 256, and when said printing-lever is attracted on the energization of its controlling magnet the circuit controlled by contacts 255 is broken and that controlled by contacts 256 is closed. Two contacts 255 and two contacts 256 are employed, these being secured to an insulating block 257 and provided with suitable terminals for wires.

The record medium or web of paper may be fed to the printing-wheel, and the printing-wheel may be inked, in any suitable manner. Here the paper is carried by a reel 258 journaled on a rod 259 at the upper end of a bracket 260 rising from the base 113. The inking means shown consists of an inking-wheel 261 similarly mounted on the journal portion or shank of a screw 262 at the upper end of an arm 263 secured to the post 216 by means of a screw 264.

In addition to the circuit-controlling devices herinbefore described the main synthetic magnet 106 also governs the operation of a circuit-controller. This circuit-controller consists of a divided contact-strip 265 and a contact 266, both of which are carried by a post 267 on the base 113. Two other circuit-controllers are governed by the movements of the levers 172 and 178. These circuit-controllers are here shown as spring-arms 268 and 269 adapted to cooperate with the levers 172 and 173 and close circuits to ground through such levers.

Referring now to, the manner in which the different letters, figures, etc., of language are selected by their code-characters will new be described. In this view I have illustrated in the second column thereof the order of succession of the letters, figures, etc., on the type-wheel, forty-three of the characters most commonly used being illustrated. In the fourth, fifth, sixth, seventh, eighth, ninth and tenth columns of