Cutting by use of rotating axially moving tool – With randomly-actuated stopping means – Responsive to condition of tool or tool-drive
Patent
1980-04-02
1982-03-09
Bilinsky, Z. R.
Cutting by use of rotating axially moving tool
With randomly-actuated stopping means
Responsive to condition of tool or tool-drive
318473, 408710, B23B 4724
Patent
active
043186467
ABSTRACT:
A tapping machine having a spindle which is moved reciprocally, i.e., in advancing and retracting direction while being rotated forwardly and backwardly for forming a female screw in a work with a screw tap attached at one end thereof. The machine is provided with driving means including a reversible electric motor, position sensing means for generating a sensing signal when the spindle is moved in advancing direction from a start position so far as a predetermined position, and temperature sensing means for generating a sensing signal when the temperature of the electric motor has risen exceeding a predetermined value. The machine normally repeats a working cycle wherein the spindle is moved in advancing direction from the start position while being rotated in forward direction until it is retracted to the start position soon after a sensing signal from the position sensing means has been generated. The operation of the spindle is continued, even when a sensing signal from the temperature sensing means is generated in the course of the advance-movement of the spindle until the current working cycle is finished. And a succeeding working cycle is prevented from being commenced until the sensing signal from the temperature sensing means is ceased.
REFERENCES:
patent: 2397974 (1946-04-01), Morrow et al.
patent: 3187248 (1965-06-01), Carolin
patent: 3720135 (1973-03-01), Merner et al.
Bilinsky Z. R.
Brother Kogyo Kabushiki Kaisha
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