| 摘要 |
A reflex photoelectric sensor (24) is provided to ascertain the precise position of a sheet of paper being fed around the writing roller 16 of an automatic typewriter or fast printer, to provide a signal from which the automatic drive of the writing roller can then advance the paper precisely so that what is written thereon will be in registry with pre-printed material on the paper, thus making it unnecessary to use edge-perforated long folded strips of paper in order to have precise location of lines automatically printed out on the paper.
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