| 摘要 |
A punch tape reader apparatus controlling item and total printing of a lister-adder machine is cyclically operable to read binary-coded decimal data from the tape by sensing the punched holes a tape line at a time, and serially transmit signal representations of individual decimal value digits of each line of data thus sensed to circuits energizing solenoid actuators for machine keys corresponding to the decimal digit values read. Data-sensing proceeds when reciprocative sensor rods guided in knife-edged openings descend by gravity upon each tape line to direct seeker pins on the rods through holes in the tape. Magnets affixed to the rods move therewith such that rods finding holes position magnets opposite to glass sealed, magnetically actuated switches. A multicontact stepping relay operates to scan the switches and initiate a sequence of functions wherein data sensed and imparted to the switches by actuation thereof is transferred through a binary-decimal to decimal converter and thence to the key-actuating solenoids. A counter registering operational cycles in presettable to control item printing after every predetermined number of items sensed, and a further counter registering a number of items printed is presettable to control total taking after every predetermined number of items printed.
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