Patent GB-831111-A (GB)
Title: Record-controlled printing machine
IPC: B41J3/50
Filed: 1956-05-02
Abstract: 831,111. Perforating tapes. COMMERCIAL CONTROLS CORPORATION. May 2, 1956 [Sept. 20, 1955], No. 13587/56. Class 31 (2). [Also in Group XVI] Record controlled printing and perforating.-A machine for reading information on a first medium, e.g. a punched tape or a punched record card comprises means for punching that information in a second tape, printing means, which may be operated manually or operated in response to information read from the first medium, and means for concurrently producing a by-product tape having thereon both the original information and the information manually typed so that the whole matter typed may be duplicated from the by-product tape without manually re-typing. The by-product tape is produced by a tape punch forming part of the typewriter and is controlled by an " On 1 " key and if necessary a second by-product tape may be produced by a remote punch which is controlled by an " On 2 " key. Some of the information read by the tape reader may be omitted from the printed document by the manual actuation of a key S5. When this is pressed and released, the reader starts and continues to read the tape until it reaches a stop code. If necessary the information read but not printed may be punched into either one or both by-product tapes. This non-print operation may be automatically started and stopped by codes in the programme tape. Similarly automatic selection of what is reproduced in the byproduct tape is determined by the manual punch selection control switch S2 which is normally in the " ALL " position in preparing a programme tape and is normally in "SEL" position where both the No. 1 and No. 2 tape punches are automatically turned off and on by suitable codes in the programme tape. Further, the two tapes can be automatically created, one containing information printed and the other the information not printed but both containing common information. The machine described is similar to that described in Specification 750,454 in respect to the code selector, tape perforator, tape reader and the code translator but is adapted to use, as well as tapes, one or both edges of a standard tabulating record card, or a fan fold form as the medium for carrying the coded information. The reader 10R, Fig. 1, is provided with means for reading these punched media, and is fully described in Specification 831,112. Punching.-The construction of the tape punch, Figs. 2 and 3, is similar to that described in Specification 750,454 and includes an additional sprocket wheel for feeding the cards and means whereby a card is automatically fed from the last punch operation to the end of the card. The lower end of each punch pin is modified to receive contact actuators for moving ganged contacts associated with a parity check system. This system ensures that each punch code conforms to a pre-established code system which should always include an odd number of code bits. If there is an even member of code bits indicating faulty punch setting, an electrical circuit holding an odd count relay is interrupted and thus further operation is terminated and the key levers on the keyboard are locked against further operation. Punching errors due to the speed of typing exceeding possible punch operations are prevented by contacts operated by the key levers having to be opened between each two key actuations. Stop, print restore, and error codes may be punched into the tapes of either one or both of the tapes No. 1 and No. 2 by manual actuation of keys S7, S8 and S9, and however long these keys are depressed only one cycle of punching occurs.