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IBM card sorter
An IBM card sorter is a machine for sorting decks of punched cards in the format popularized by the International Business Machines Corporation (IBM), which dominated the punched card data processing industry for much of the twentieth century. Sorting was a major activity in most facilities that processed data on punched cards using unit record equipment. The work flow of many processes required decks of cards to be put into some specific order as determined by the data punched in the cards. The same deck might be sorted differently for different processing steps. The IBM 80 series sorters sorted input cards into one of 13 pockets depending on the holes punched in a selected column and the sorter's settings.
==Basic operation==
The basic operation of a card sorter is to take a punched card, examine a single column, and place the card into a selected pocket. There are twelve rows on a punched card, and thirteen pockets in the sorter; one pocket is for blanks, rejects, and errors.
Cards are normally passed through the sorter face down with the bottom edge ("9-edge") first. A small metal brush or optical sensor is positioned so that, as each card goes through the sorter, one column passes under the brush or optical sensor. The holes sensed in that column together with the settings of the sorter controls determine which pocket the card is to be directed to. This directing is done by slipping the card into a stack of metal strips (or ''chute blades'') that run the length of the sorter feed mechanism. Each blade ends above one of the output pockets, and the card is thus routed to the designated pocket.〔 Operation of the sorter's chute blades is described and illustrated on pages 86-87〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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