Patent GB-743618-A (GB)
Title: Word writing typewriter
IPC: G06F17/27
Filed: 1953-11-02
Abstract: 743,618. Word-writing typewriters. INTERNATIONAL BUSINESS MACHINES CORPORATION. Nov. 2, 1953 [Nov. 5, 1952], No. 30209/53. Class 100 (4). Mechanisms are provided in an electrical power-operated typewriter so that, upon the depression of a " word " key, the subsequent depression of an ordinary type key will cause a whole word or phrase to be typed. The operations of the types, back spacing, tabulating, carriage return, spacing and shifting are effected in the usual way during normal typing by mechanical connection to a power roller directly by the respective keys, but for word typing solenoids are provided to effect the movement of the keys which is normally produced by finger action. In the case of the carriage return mechanism, Fig. 3, a key 56 acts to trip a non-repeat cam-operated mechanism 60 to engage through a latch link 66 a carriage return clutch 62 and at the same time to rock a clutch knockout lever 64 into the path of the left-hand margin stop. The link 66 through levers 70, 76 causes the clutchoperating arm 80 to move against a plate 82 to cause a disc 84 to engage a clutch pulley 86 so that the power roll 30 winds up a carriage return tape 88 to return the platen, until the clutch knockout lever 64 is engaged by the margin stop and through a resilient link 94 and bell crank 96, restores the link 66. Pulses for these actuating solenoids are obtained from the segments of six stepping switches each having seven banks or levels of ouput contacts. In word printing operation, depression of one of the forty-two typing keys selects one of the seven levels in each of the six stepping switches and at the same time starts the movement of only one switch so that one activated level is selected out of the forty-two possible combinations and as each segment of the selected level is reached it will send a pulse to a solenoid of one of the type keys to which it has been previously plugged. Thus a succession of letters &c. will be printed until the activated stepping switch reaches the end position again at which point the typewriter is returned to the state for ordinary typing. The " word " key need not be held down throughout the operation as a holding circuit is provided. If a phrase requires more than eighteen impulses-the capacity of one level, means are provided so that another level may be automatically picked up to continue the sequence of pulses. Electrical interlocks are provided so that carriage-return is actuated whenever a word is completed after the bell warning at the end of a line or if a long word is being typed it will be automatically hyphened at the next appropriate pre-set point and the carriagereturn is then effected. A word so set for hyphenation will not be so hyphenated at any other point of the carriage movement. Interlocks also effect spacing, shifting, back spacing, and tabulation when appropriate. Interlocks stop the selected stepping switch while such operations are completed and, if a short word is completed early in the movement of a switch, the machine is immediately returned to a state for ordinary typing and the mechanical movement of the switch is accelerated. Specification 660,263 is referred to.