Engineering:Card saw
A card saw, also called a card knife or card removal tool, is a tool used to remove jammed punched cards from a card feed in a punched card reader.
Machines that use punched cards, such as sorters or tabulators, often automatically feed cards through an automated hopper to consume input. The cards are fed mechanically through a reader. Due to their physical properties, they may jam the feed. A card which lacks sufficient structural integrity to be fed through the machine may buckle or tear; a card with a hanging chad or other deformity could be too thick to pass through a feed.
A card saw designed for the machine being used could then be employed to catch and mechanically remove the jammed card from the feed.[1] The card saw is a flat metal tool with a flat hook at one end;[2] it can mechanically push the remnants of the jammed card from the machine, and also pull remaining paper out with the hook. Following this, card processing can resume.
References
- ↑ IBM Corporation (April 1971) (in en). 129 Card Data Recorder Operator's Reference Manual (1st ed.). pp. 39. https://www.masswerk.at/keypunch/manuals/IBM129-GA22-6968-0_129_Operators_Manual_Apr71.pdf.
- ↑ "IBM 129 Card Removal Tool - 102667199 - CHM" (in en). https://www.computerhistory.org/collections/catalog/102667199/.
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