| 摘要 |
Circuitry for controlling the hammers of a chain type printer which is effective for maintaining each hammer set for a period greater than the time of one print scan (the time between alignments of successive print characters on the chain with the same print position) and less than the time of two print scans. The data to be printed by each hammer is obtained from a print buffer. After firing of a print hammer, within a time less than one print scan, a substitute piece of data is written in the location in the buffer from which the data printed by the hammer is derived, and the circuitry recognizes this substitute piece of data and does not reset the hammer at this time. Subsequently, the circuitry recognizes this substitute data and inserts still another piece of substitute data, this occurring one print scan subsequent to hammer firing. The circuitry recognizes the second substitute piece of data so that when the hammer is again addressed, a fraction of a print scan time later, the hammer is reset.
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