Claims
- 1. A material working machine having a tool holder, a tool movably attached to the tool holder and adapted to move forward and backward relative to the tool holder along a work path, a resonant member mounted on the tool holder, the resonant member having an output backwardly spaced from the tool and an input, means for rigidly supporting the resonant member with respect to the tool holder as to all motion except resonance, means remote from the supporting means for applying an oscillatory, resonance causing force to the input of the resonant member for a given period of time to cause the output to oscillate forward and backward relative to the tool holder about a neutral position and to strike the tool on forward oscillations, and means for applying a unidirectional force to the tool holder for the given period of time to advance the tool intermittently along the work path as the resonant member resonates, wherein the improvement comprises means for stopping the backward movement of the tool before the tool reaches the neutral position of the output of the resonant member when the tool encounters an immovable object during the given period of time.
- 2. The material working machine of claim 1, in which the stopping means comprises a stationary bar supported by the tool holder between the output of the resonant member and the tool.
- 3. The machine of claim 2, in which the bar is so located that the spacing between the bar and the neutral position of the output of the resonant member is approximately 1/8 of the total peak-to-peak amplitude of the oscillations of the output of the resonant member.
- 4. The machine of claim 3, additionally comprising a plurality of shims mounted on the bar facing toward the tool.
- 5. The machine of claim 2, additionally comprising a plurality of shims mounted on the bar facing toward the tool.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of my copending application Ser. No. 905,372, filed May 12, 1978, the disclosure which is incorporated fully herein by reference.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
905372 |
May 1978 |
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