公开(公告)号：US3896291A

公开(公告)日：1975-07-22

申请号：US44118174

申请日：1974-02-14

申请人： SINGER CO

发明人： WIEDEMAN CHARLES W

IPC分类号： G06K7/016 ,  G06K13/073 ,  G06K13/02 ,  G06K7/10

CPC分类号： G06K13/073 ,  G06K7/016

摘要： An improved card reader for sensing and readout of Hollerith punched-hole cards. The reader senses the manual entry of a Hollerith card to turn on driving rollers which grasp and press the card inward into the mechanism. The leading edge of the punched card then comes into contact with a flange-head which is part of a strobe bar carriage. The pressure of the inwardly driven Hollerith card causes the front edge of the Hollerith card to press against the head and to initiate forward motion of the strobe bar carriage. The strobe bar carriage carries a linear bar with a series of precisionly spaced apertures in its base which are used to trigger a strobing signal as each column of the punched card passes over the read station. The read station puts out a set of signals indicative of the pattern of each column of the Hollerith card. When the last column of the Hollerith card is read, a reverse sensing photocell is triggered which drives the card backward out of the entry slot. A return spring retracts the strobe bar carriage back to its initial position adjacent the entry slot of the card reader. The strobe bar flange and carriage is made to contain a heavier mass than that of the Hollerith card and is at least of equal width to that of the width of the Hollerith card so that any ''''skewness'''' of the Hollerith card in the entry slot will be rectified when the edge of the Hollerith card is flatted against the strobe bar head. Further, the thrust of the Hollerith card will not cause bounce or jerk of the strobe bar carriage (which might lead to reading errors) but will merely accelerate the strobe bar carriage in a smooth fashion.