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Cam-actuated thread tapper

  • US 5,165,828 A
  • Filed: 08/12/1991
  • Issued: 11/24/1992
  • Est. Priority Date: 08/12/1991
  • Status: Expired due to Term
First Claim
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1. A thread tapper, comprising:

  • a base;

    a feed carriage slideably affixed to said base to provide a working stroke having advance and retract directions of movement;

    a spindle motor affixed to the carriage including a spindle and chuck connected thereto for holding and rotating a tap;

    a feed motor connected to said carriage which causes the tap to be selectively moved in the advance and retract directions;

    a first controller connected to said feed motor which contains a motion pattern stored in memory for repeatably executing a cyclical pattern of movement of said carriage over a timed cycle throughout its stroke, the positions of said carraige during its stroke being controlled independently of the spindle rotation;

    a second controller which also contains a cyclical pattern of spindle rotation stored in memory for repeatably executing a pattern of spindle rotation over a timed cycle; and

    a dwell period defined by the point in time when the first of said carriage cycle or said spindle cycle has been completed and when both cycles are thereafter reinitiated simultaneously from a home position, said home position being the starting point of both cycles in position and time.

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