| 摘要 |
A work holder for precision positioning and movement of a workpiece (20) relative to a machine tool comprises a base (100), a pair of spaced stocks (200, 300) mounted on the base, a spindle assemblies (210, 310) supported on each of the stocks for rotation about a common axis, a chuck (246, 346) supported on each of the spindle assembly (210, 310) for clamping the workpiece (20) therebetween, and adjustable mounting means (236-272, 336-372) on each of the spindle assemblies (210, 310) for permitting movement of each of the chucks (246, 346) transversely of the axis. A driveshaft (406) and gearing (402, 408) is provided for imparting rotation to one spindle assembly (210). A crank (422) is operatively connected to the driveshaft (406), and oscillating drive means (416) is providing for oscillating the crank (422) about the driveshaft (406) in two opposite directions. Ratcheting frictional clutch means (424 through 450) is provided for transmitting the motion of the crank (422) to the driveshaft (406) only when the crank (422) moves in one of the two directions. Angular adjustment of the work holder relative to the horizontal is accomplished by inserting gauge blocks (124) of specified height (h) beneath a convex, substantially cylindrical bearing surface at one end of the hinged work holder baseplate (106), the angle of inclination being a function of the height (h) through the sine relationship of height (h) to baseplate length (l).
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