Patent GB-1030158-A (GB)
Title: Improvements in or relating to data-printing or recording equipment
IPC: B41J11/44
Filed: 1962-11-27
Abstract: 1,030,158. Selective printing. HONEYWELL Inc. Nov. 27, 1962 [Nov. 28, 1961], No. 44821/62. Heading B6F. [Also in Division G4] Special platen rotation.-A format-determing apparatus for advancing a record medium 10 to selected line positions for recording of data thereon in a series of predetermined forms comprises an endless tape 30 having perforations 36, 38 for deriving indicating signals HOF-PT and EOF-PT of the head and end of each form, respectively, a central processor 52 for deriving instruction signals pertaining to the head-of-form, HOF-CW, end-ofform EOF-CW, and line count LC of the data to be recorded means responsive to the headof-form instruction signal HOFCW to advance the record medium 10 until a head-of-form indication signal HOF-PT is received. The apparatus further comprises means responsive to a line count instruction signal LC in the absence of a head-of-form instruction signal HOF-CW to initiate advancement of the record medium, means responsive to an end-ofform instruction signal EOF-CW to continue advancement of the record medium until a head-of-form indication signal HOF-PT is obtained and means for deriving a line count advance signal LCA and comparing it with a line count instruction signal LC to derive a STOP signal for arresting the advance of the record medium. In operation of the apparatus the vertical format may be selectively controlled in three different manners, viz. head-ofform control, end-of-form control and line-count control. The data to be printed and formating instructions are derived from the output data of a computer, which are fed to the control processor 52, and which in turn is coupled to a printer control unit 53. The formating instructions comprise a control word which includes head-of-form instructions (HOF-CW), end-ofform instructions (EOF-CW), line count instructions (LC) and end-of-record instructions (ER). The applications of the control word instruction signals to the formating apparatus are dependent upon the completion of the printing of the previous line without error whereupon the end-of-record signal ER is applied to the printer control unit 53 to inhibit the central processor 52 and suppress further printing. Head-of-form control.-For double-spacing and like the head-of-form indications HOF-PT may be punched on the paper tape 30 as at 36. Following the end-of-record signal ER an assertive HOF-CW signal from the printer control memory 54 produces a signal at the output of a buffer 64, calling for advancement of the record medium 10 and a gate 80 applies an output signal to the reset input of a flip-flop 78 which results in the application of a delayed binary ONE signal to a clutch 26 causing the latter to couple the drive motor 24 to the shaft 22 to move the record medium 10, paper tape 30 and slotted disc 46. The HOF-CW signal also set a flip-flop 66 applying an assertive signal FF-66 to a gate 70. Upon advancement of the paper tape 30 a hole is sensed in a column 36 by a photo-electric device 44 producing a binary ONE pulse in the HOF-PT signal which is applied to the gate 70. The output of the gate 70 is applied to the buffer 76 whose output signal sets a flip-flop 78 and its assertive output energizes the brake 28 to arrest the drive shaft 28. In another embodiment the tape 30 may be omitted and the head-of-form indications provided in the form of magnetic indicia spaced periodically at line space intervals on the record medium and magnetically recognised at a reading station. End-of-form control.-Following the end-ofrecord signal ER, the signals HOF-CW and HOF-PT are set to binary ZERO, whilst a binary ONE pulse in the end-of-form instruction signal EOF-CW sets the flip-flop 60 so that its assertive output is applied to gates 61 and 62. A line count instruction LC presets the line counter 56 and the output signal of the latter, when buffered to the gate 80 results in the advancement of the record medium, when a hole 38 in the tape 30 is sensed by photoelectric means 44 an end-of-form indicating signal EOF-PT is generated and applied through the gates 62, 61 to the buffers 58, 63, respectively to reset the counter 56 to binary ZERO state and set the flip-flop 66. No record medium STOP signal is generated by the gate 68 since the negative output FF-66 has become ZERO, and the record medium continues to advance until a hole 36 is sensed giving a head-of-form indicating signal HOF-PT, which in conjunction with the assertive output FF-66 of the flip-flop 66 causes the gate 70 to conduct with the result that the buffer 76 sets the flip-flop 78, whose assertive STOP signal energizes the brake 28 stopping the record advance. Line-count control; counter applications.- The line-count control is used where frequent changes of format occur and under these conditions the HOF-CW, HOF-PT and EOF-PT signals are zero and the line count instruction signal LC line preset the inversely counting line counter 56 to the number corresponding to the required number of line spaces that the record medium is to be spaced. The binary ONE output signals from the counter buffers the gate 80 and calls for advancement of the record medium, paper tape 30 and the slotted disc 46, whose slots correspond to single line spaces. The light source and the detector 50 co-operate to generate a line count pulse, each of which decreases the line counter advance pulses of the counter 56 by a count of 1. When the line count of 0 is reached assertive output signals to the gate 80 are inhibited and when the next hole 36 in the tape 30 is sensed an HOF-PT signal resets the flip-flop 66 so that the negative output FF-66 in conjunction with the negative output LC = 0 of the counter, may trigger the gate 68 and through the buffer 76 call for a STOP signal to arrest the shaft 22. The line count advance pulses could be used to operate an ordinary counter, whose output may be compared with the line count instruction or means could be provided for magnetically recognizing suitable indicia spaced periodically at line space intervals about the disc 46 or the record medium could carry these indicia to obtain the LCA pulses.