Patent GB-840894-A (GB)
Title: Improvements in typewriter tape punches and like machines
Filed: 1956-12-11
Abstract: 840,894. Typewriters etc.; strip-perforating machines. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 11, 1956 [Dec. 30, 1955],.No. 37842/56. Classes 100(3) and 100(4) A typewriter controlled tape punch machine of the kind described in Specifications 805,335, 737,751 and 644,576, prints a numeral associated with the numeral key operated on a work sheet of paper and simultaneously punches varying amounts of the same data into a record strip under control of a plural row programme tape having a column corresponding to each column position of the paper carriage, has improved programme selecting means. These, depending. on the position of the typewriter carriage, operate a contact, by the numeral key to serve either to select a programme or condition the tape punch for code perforation. The typewriter has a standard keyboard and type bars, but during a power driven print stroke up to seven of eight bails are selectively conditioned, according to a code, to close electrical contacts which provide pulses; the eighth bail closes a contact every time a key is pressed. Tape 6, Fig. 1, is punched by pins 2 sliding in guide 4. The punches will not penetrate the tape unless tails 14 are held by interposers 16 controlled by magnets 18 energized by the selected circuits. Shaft 12 is rotated through an electrically energized clutch every machine cycle to move the appropriate punch pins and advance the tape. Extensions 22 operate ball contact unit 24. The numeral keys as well as functioning as normal characters select the punching programme when the carriage is in left hand margin position. When each column of the carriage reaches the print position a corresponding column of the programme tape reaches a read station where star wheels sense holes to operate appropriate electrical contacts controlling the punches, i.e. if a hole is sensed a pulse is supplied which puts the punches in the "off" condition. A programme is selected for each line of typing by depressing one of the numeral keys whilst the carriage is in left hand margin position, having been returned thereto by operation of the carriage return key. If a key other than a numeral key is pressed the keyboard will be locked through mis-programming relay C, Fig. 2a. Also, if a numeral key is pressed for programme selection before the circuits have been conditioned, by pressing the carriage return key 54, Fig. 2a, the keyboard again locks, lock relay 52, Fig. 2b, effecting this. If the carriage return key is now pressed the carriage will be returned and programme selection relay X will be energized. If a numeral key is now struck the following will take place;-one or more of programme relays 49-104, 49-107, 49-110, Fig. 2a, will be pulsed, clutch 20, Fig. 2b will initiate a punch cycle, end of line control relay E and tab solenoid 56 will be energized. The latter is positioned under the tabulation key lever and initiates tab operations to a conventional tab stop. With the E relay energized a pulse goes through E-2, H-4, to number one interposer magnet so that a number one hole will be punched. During a second punch cycle a programme indication which depends on the programme selected is punched into the tape. Programme relays 49-104, 49-107, 49-110 stay energized through holding circuits until the carriage return key is operated, and establish a circuit through only one of contacts 62 across one of the star wheels 60 which sense the holes in the programme tape. If the zero type key is pressed at the beginning of a line zero programming relay 155, Fig. 2a, and punch off relay H are energized and no punching will be done in that line. If an error is made backspace key 64, Fig. 2b is struck to energize error relay 50 and keyboard lock relay 52. Carriage return key 54 is now pressed when an auto-feed signal and an error signal will be entered into the tape. The line is then re-programmed and typed. Also unless a predetermined pattern of pulses passes through contacts 34, 36, Figs. 1, 2b of ball check unit 24, Fig. 1, during each punch cycle to energize D relay a further pulse will energize error relay 50, Fig. 2b, and keyboard lock relay 52 to lock the keyboard.