| 摘要 |
838,869. Automatic character reading. NATIONAL CASH REGISTER CO. Oct. 15, 1958 [Dec. 10, 1957], No. 32911/58. Class 106 (1). Characters printed in magnetic ink on a tape 10 are sensed in a series of parallel scans by magnetic reading heads 17, 18, 19 and 20 spaced around the periphery of a rotary disc 12, the tape moving across the line of movement of the heads in timed relationship to produce a train of pulses characteristic of the character sensed. The four heads are connected in series and the signals generated are taken off via a slip-ring. The tape 10 is fed by a pair of capstan rollers geared to the shaft 13 through a variable gear-box 13a and is curved by surface 15 of guide 16 to match the surface of the disc 12. The signals generated, which are a series of alternate positive and negative pulses, are amplified and applied to a tapped delay line. The outputs from the tappings pass to correlation circuits, one for each character to be recognized and the circuit giving the highest output at the time when the whole character is in the delay line, corresponds to the character identified. |
