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Broken tool detector

  • US 4,180,356 A
  • Filed: 08/03/1978
  • Issued: 12/25/1979
  • Est. Priority Date: 08/03/1978
  • Status: Expired due to Term
First Claim
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1. A detecting apparatus for a machine tool comprising;

  • a head member, a spindle assembly supported by said head member, means for rotating said spindle assembly and moving it axially from an initial position through a full cycle including an approach phase in which said spindle assembly and a workpiece are moved relative to each other and a feed phase during which work is done on said workpiece, a tool supported by said spindle for rotation therewith and limited axial movement relative thereto, means biasing said tool and spindle to an axially extended position and resisting relative axial movement with a predetermined force when said tool engages an obstacle, means associated with said spindle and being responsive to relative axial movement of said spindle and said tool to generate a signal, a timer activated for a predetermined period of time in a selected one of said phases, said timer being responsive to the presence of said generated signal in said feed phase to continue said cycle and being responsive to said generated signal in said approach phase to discontinue said cycle.

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