Davenport multi-spindle screw machine, and improved tool arm...

F - Mech Eng,Light,Heat,Weapons – 16 – F

Patent

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Details

F16F 15/121 (2006.01) B23Q 3/155 (2006.01)

Patent

CA 2629989

An improved Davenport~ multi-spindle automatic screw machine has a tool arm (14) mounted on a shaft (41) for rotational movement relative to a revolving head cap (13). A needle bearing (42, 42) is operatively arranged between the shaft and the revolving head cap. The bearing is radially loaded as said bearing is installed and that the individual needles of same remain elastically deformed by the radial load immediately after said bearing has been installed. The shaft has a hardened surface (52) that is engaged by the needles. The diameter of the shaft hardened surface portion is greater than the diameters of the adjacent shaft portions. Annular recesses (51, 53) extend into the shaft at either end of the hardened portion. These recesses have frusto-conical surfaces (55) that act as rarnps to guide insertion of the press-fittable needle bearing into the space between the shaft and the head cap.

L'invention concerne une visseuse automatique multibroche améliorée Davenport® qui possède un bras d'outil (14) monté sur un arbre (41) de sorte que celui-ci effectue un mouvement rotatif par rapport à un embout rotatif (13). Un support d'aiguilles (42) est placé de manière fonctionnelle entre l'arbre et l'embout rotatif. Le support est chargé radialement au moment où il est installé et où les aiguilles individuelles restent déformées élastiquement par la charge radiale immédiatement après l'installation du support. L'arbre a une surface durcie (52) avec laquelle les aiguilles viennent en contact. Le diamètre de la partie de la surface durcie de l'arbre est supérieur au diamètre des parties adjacentes de l'arbre. Des évidements annulaires (51, 53) s'étendent dans l'arbre à une extrémité quelconque de la partie durcie. Ces évidements ont des surfaces frustoconiques (55) qui ont la fonction de rampe pour guider l'insertion du support d'aiguilles adaptable par pression dans l'espace entre l'arbre et l'embout.

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