| 摘要 |
There is disclosed a typewriter carriage control mechanism which is used with a single element print head which is constructed and arranged for transverse movement across the typewriter in which a ratchet wheel is connected to the regular spring for moving the carriage in a first direction and having a sensor disclosed in ratchet wheel tooth confronting relationship which provides signals representative of radial movement of the ratchet wheel in which the wheel rotational movement is controlled by pawl devices which is actuated by a pair of solenoids to control the forward movement of the carriage. The backspacing movement of the carriage is controlled through another solenoid mechanism and each of the solenoids are controlled through the use of electronic circuits which receive data information representative of the printing function and the functions of spacing, carrier return, line return, tab, back space, and a nonescapement and correction feature operation. The structure includes a random access memory mechanism for remembering the position of the tab stops and includes counters for counting the movement of the carriage with respect to the left margin. Timing devices are used in the circuits for controlling the elapsed time in which operational functions are incapable of being performed while other functions are being performed.
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