| 摘要 |
The described invention resides in a pneumatic step-by-step perforated-tape reader comprising a rotatable drum for translating the tape on engagement with the drum, a pneumatic reading head for reading the tape when engaged with the drum, and indexing means for rotating the drum by indexed movements; the indexing means comprising escapement means for controlling rotation of the drum so that the drum undergoes the same degree of rotation in each indexed movement thereof, whereby when the tape is engaged with the drum, the tape can be translated to bring each of the succession of data locations on the tape, in turn, to the reading head to be read thereby. The invention includes mechanical features involved in the operation of the foregoing combination.
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