Patent GB-850088-A (GB)
Title: Improvements in and relating to keyboard controlled tape perforating apparatus
IPC: H04L17/08
Filed: 1957-09-12
Abstract: 850,088. Type-printing telegraphy. SPERRY RAND CORPORATION. Sept. 12, 1957 [Dec. 3, 1956], No. 28826/57. Class 40(3). In keyboard apparatus for perforating a tape according to data using the same code combination for a letter and a numeral together with a figure-shift signal, a matrix member controlled by an operated key produces a code combination including a signal element indicative of the letter-figure characteristic of the encoded signal, each signal generated by the matrix is stored, relay means is operable in response to stored signals to indicate the letter-figure characteristic of the signal and when operated actuates selectively the recording means in accordance with the letter-figure characteristic code combination of the stored signal prior to the operation of the recording means in accordance with the code combination of the character. The operation of the apparatus is initiated by closing switches 10, 12 for the power supply and for the punchoperating motor 17. A switch 20 is moved to the left effecting the energization of a punch relay 24, and switch 31 is moved to the right to effect feeding of the tape. Relay 24 connects negative supply from a rectifier bridge 15 to the grids of the triodes 85, 71 - 92 and the switch 31 completes a circuit from a released contact of a storage control relay 32 through the winding of letter-precedence relay 35 to the conductor 36 and negative voltage terminal of the source 15. The operation of relay 35 opens at contact A the' circuit of figure-storage relay 87, and at contact B prepares the circuit of a letter-storage relay 41 which operates when contact 44 is closed by cam 6. At contact C the magnet 50 is operated to lock the keyboard and at contact D a circuit is completed through the normally closed contact 51 associated with cam 7 to operate precedencecontrol relay 53 to connect negative voltage to the magnets PM1, PM2, PM4, PMS and the clutch control magnet PCM. At contact E the relay 35 connects negative voltage also to the magnet PM3 so that successive groups of five perforations are produced by the cyclic operation of relay 53 through contacts 51 closed by cam 7 until the switch 31 is moved to its left-hand position to open the circuit of relay 35 and therefore relay 53. On the operation of a lower-case character key, such as A, a circuit is completed via conductors 67, 68, 70 to the grids of triodes 71, 72, 73. The triode 71 completes a circuit through the winding of a relay 75 which over its contacts A . . . E selectively controls the circuits of magnets PM1 - PM5 and over contact F operates relay 32 which closes the circuit of the keyboard locking magnet 50. The circuits of the triodes 72, 73 extend over conductors 80, 81 and 82, 83 and through contacts A, B of relay 75 to punch magnets PM1, PM2 which operate immediately. The operation of relay 32 also opens the plate circuits of all the triodes to cut off those which had been conducting. At contact G relay 75 closes the circuit of the punchclutch magnet PCM and after a short interval the contact 51 is opened so that relay 75 releases. When an upper-case character key, e.g. numeral 3, is operated the triodes 85 and 72 are rendered conductive, and a circuit is completed over the winding of figure-precedence relay 58 which at contact A opens the circuit of letter-storage relay 41, prepares at contact B a circuit for operation of figure-storage relay 87 by contacts 44 closed by cam 6. Contact C of relay 58 operates the key lock magnet 50 and contact D operates relay 53 energizing magnets PM1, PM2, PM4, PM5 and also punch control magnet PCM. The third magnet PM3 is not energized since contact E of relay 35 is not closed. During the early part of the cycle for punching the figure-shift code, contacts 51 open, but without effect, and when they are closed 1 a circuit is completed over the winding of code-control relay 75, contact B of relay 87 to the triode 85 and at contact A of relay 75 a pulse is passed from the tube 72 to the punch magnet PM1. Over contact G a further punch cycle is initiated by energization of the magnet PCM and over contact F relay 32 is operated to open the plate circuits of the tubes 85, 72. During the punch cycle the contacts 51 open so that relay 75 releases and de-energizes relay 32. The punch magnets PM1 - PM5 control latch members which are utilized to control the punching mechanism, as described in Specification 566,964 or in U.S.A. Specification 2,412,422.