Patent GB-973666-A (GB)
Title: Decoding device for operating a typographical linecasting machine
Inventor: CORRADO VICTOR MENNA
IPC: B41B27/10
Filed: 1962-05-04
Abstract: 973,666. Type-bar-making machines. ELTRA CORPORATION. May 3, 1963 [May 4, 1962], No. 17327/62. Heading B6W. Controlling by recordstrip.-In a linecasting machine automatic operating unit including a plurality of code bars, first and second solenoids associated with each of the code bars are adapted when energized to move their associated code bar from a normal to an operating position and vice versa respectively, and a plurality of trip levers associated directly with the key weights to release matrices. As shown in Fig. 1, a keyboard key 20 actuates the normal key weight 24 to operate the known matrix release mechanism. Six code bars 43, a shift code bar 44 and a blocking bar 45 are arranged behind the keyboard and are moved to their operative and inoperative positions by respective pairs of solenoids 64, Figs. 2 and 3. A plurality of trip levers 81 associate directly with their respective key weights 24 and each co-operates with a ledge 42 when allowed to move into the aligned slots of the code bars by a reciprocating bail bar 85. Additional levers 90 operate bail switches 91. The tape reader is provided with a ratchet and pawl mechanism for intermittently feeding the tape past the sensing pins, and the pawl is connected to an inhibitor solenoid 181, Fig. 13 (not shown), which disengages the tape drive when energized. When a signal is read from the tape, it is first stored in a series of memory relays. During the following cycle, the signal stored is used to operate the code bar solenoids and results in a particular trip lever 81 operating a keyweight 24 to release a matrix. During this second cycle, a new signal is read and stored in the memory relays. If the signal is a shift signal a particular lever 90 operates a bail switch 91 to energize a solenoid 64 to move the shift code bar 44 to its operative position. This will remain there until a de-shift signal is read and another lever 90 operates a second bail switch 91 to energize the return solenoid 64 of the shift code bar 44. A switch 88 operated by each code bar when in the operating position determines the position of its respective code bar, so that a preceding signal indicated by the position of the code bars can be compared electrically to a signal being read in the following cycle. When there is a repeat character and the signals are the same, a one-cycle delay is introduced by moving the blocking bar 45 to its operative position when a delay relay is energized due to the identical signals. This is accompanied by the energization of the inhibitor solenoid 181 in the reader drive to prevent further feed of the tape during the one cycle delay. If a rub-out signal (i.e. six perforations) or a blank signal (i.e. no perforations) is repeated on the tape no delay occurs. Further delays required in the operation of the linecasting machine are decoded in a known type of diode matrix circuit which provides delays of up to 3 cycles for such operations as delivery of a spaceband, auxiliary rail functions to ensure that matrices are properly assembled in their regular or auxiliary positions, and delivery of a line to the assembler. A multi-level rotary manual selector switch is incorporated in the reader circuit for selecting various spaceband delays. Overall control of the electric circuit of the reader is provided by a plurality of cam-operated time switches, the cams of which are rotated once for every single signal length feed of the tape. Specifications 746,446 and 925,597 are referred to.