Spindle mechanism
AssigneeSango Co., Ltd.
InventorsYukinori Suzuki, Kiyofumi Sakuragawa
Life of this patent
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Abstract
In order to achieve the lightweight, low-cost and high-efficiency design of a spindle apparatus, speed-change device 50 is provided such that slots 31 are formed in one of a spindle 10 and a cam shaft 12 while spiral torque cam grooves are formed in another, and extend around the axis thereof. A torque cam pin 34 is engaged in each slot and its associated torque cam groove, and the position of the spindle 10 relative to the cam shaft 12 in a circumferential direction can be changed by moving the torque cam pins 34 in the axial direction by drive device 43. Drawing tools 8 are moved in opening and closing directions by changing the position of the spindle 10 relative to the cam shaft 12 in the circumferential direction.
Claims8
A spindle mechanism wherein a drawing tool-mounting member, on which drawing tools are supported for sliding movement in a radial direction, is provided at a distal end of a spindle, and a cam shaft is rotatably provided at said spindle in a coaxial relation thereto, and a cam plate whose rotation causes said drawing tools to move in the radial direction is provided at a distal end of said cam shaft, and a relative rotation difference is produced between said spindle and said cam shaft, thereby moving said drawing tools in the radial direction;
- characterized in that the relative rotation difference between said spindle and said cam shaft is produced by adjusting a condition of engagement of said spindle with said cam shaft.
Dependencies are inferred from the claim text.