Tool driving or impacting – Self-acting advance and retraction cycle
Patent
1972-11-28
1976-05-11
Simpson, Othell M.
Tool driving or impacting
Self-acting advance and retraction cycle
74841, 173146, 173156, 408134, 408137, B23B 4720
Patent
active
039556298
ABSTRACT:
This application discloses an improved quill feed unit of the type used in automatic or semi-automatic machines for holding and advancing the tool during the machining operation, wherein the rapid advance, feed, and rapid retract movements present in each machine cycle are performed entirely mechanically.
Previously, substantially all of such guill feed units have been operated by the use of a hydraulic or pneumatic power, or a combination thereof, i.e., a hydraulic or pneumatic cylinder would advance and retract the tool, while a suitable motor would rotate the tool.
Despite efforts to solve them, severe problems were and are still encountered with these units. Problems such as leakage, poor start up, tool breakage and ease of tampering are commonplace.
By the complete elimination of hydraulic fluid and air in Applicant's quill feed unit, the problem of start up of hydraulic units due to the thickening of the hydraulic fluid, when cold, are eliminated, as well as the problems of tool breakage, tampering, and leakage.
In Applicant's invention, a single ball-screw assembly performs the rapid advance, feed, and rapid retract operations entirely mechanically without the use of fluids whatsoever. The ball-screw unit itself is driven electrically through planetary or other suitable gearing to perform these operations. Electric motors drive the necessary gearing to operate the unit, as well as drive the tool.
REFERENCES:
patent: 3160033 (1964-12-01), Moyer
patent: 3640147 (1972-02-01), Fantoni
patent: 3760490 (1973-09-01), Burg
Bilinsky Z. R.
Dolgorukov D. Edward
Simpson Othell M.
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