| 摘要 |
Stop marks are printed on a document such as a bank passbook to indicate the position of the last data entry. The passbook is fed into the present apparatus until the lowermost stop mark is sensed. The passbook is stopped after a predetermined number of timing pulses have been counted after detection of the stop mark and another stop mark is printed on the passbook. The density of the new stop mark is sensed and, if insufficient, more stop marks are printed on top of the new stop mark until the sensed density becomes sufficient. Each stop mark may comprise two or more parallel lines which must be detected separately.
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