摘要:
A rotary stage having an integrated collet closure assembly includes: an actuating piston positioned in a piston housing; a drawbar configured to be moved axially depending on the position of the actuating piston to open and close the collet closure assembly, and rotationally by movement of a rotating shaft of the rotary stage; and a pair of thrust bearings provided between the actuating piston and the drawbar. The pair of thrust bearings acts as an interface between the actuating piston and the drawbar such that the drawbar rotates freely and the actuating piston and the piston housing remain stationary in a rotary direction.
摘要:
A force limiting workpiece holding device for holding a workpiece in a workpiece processing assembly having a spindle and a closer that applies a force, comprises a workpiece holder slidably mounted to the spindle. The workpiece holder includes a plurality of circumferentially-spaced gripping segments that are movable between expanded and contracted positions to grip and release a workpiece. A force limiting coupling structure includes a biasing structure having a spring force. The coupling structure is operatively mountable between the workpiece holder and the closer such that a force applied by the closer to move the gripping segments of the workpiece holder between the expanded and contracted positions is transferred to the workpiece holder through the coupling structure and the biasing structure thereof, whereby a resultant force being applied to the workpiece holder by the closer is limited to the spring force of the biasing structure.
摘要:
A spindle for gripping and closing a mounting member which includes a housing having a spindle assembly mounted therein including a first rotary member capable of rotation about its longitudinal axis and a second rotary member disposed about the first rotary member in coaxial relation and being capable of rotation about the longitudinal axis. The first rotary member has a gripping portion for gripping the mounting member and the second rotary member has a thrust surface and a contacting portion for contacting the mounting member. A radial bearing in the housing supports the second rotary member, and a fluid thrust bearing supports the thrust surface of the second rotary member. One of the first and second rotary members is capable of axial movement relative to the other rotary member and has an engagement surface engageable for causing axial movement of the axially moveable rotary member. An actuating assembly is provided to selectively engage the engagement surface to move the axially movable rotary member relative to the other rotary member to draw the mounting member against the contacting surface for closure.
摘要:
A method and apparatus are shown for closing a spring collet upon a work piece in a lathe or similar machine tool, in which neither the work piece nor the collet is moved in the longitudinal or axial direction.The collet closer has a nosepiece assembly within which an axially movable sleeve is provided. Movement of the sleeve causes the collet to open or close, in a radial direction, without axial dislocation of either collet or work piece.The nosepiece assembly contains a hydraulic circuit which actuates the movable sleeve in response to movements of a draw bar.
摘要:
Wear of a sliding member is prevented or controlled in a portion of the sliding member at a specific angular position (phase) about an axis. A fixing device includes a chuck-actuating claw which rotates with a main spindle, and is displaced to open and close a chuck section, a rubber ring which rotates with the main spindle, and a bobbin (sliding member) which is provided to be movable between a first position and a second position along an axis direction of the main spindle, rotates with the rubber ring in contact with the rubber ring in the first position, rotates with the chuck-actuating claw while displacing the chuck-actuating claw in contact with the chuck-actuating claw in the second position, and does not have contact with both of the rubber ring and the chuck-actuating claw in a partial range between the first position and the second position.