37results about "Work driver" patented technology

A method of dialing a workpiece having an axis into a chuck includes providing a chuck assembly having a plurality of independent hydraulically controlled jaws distributed about a central axis, each jaw having first and second hydraulic chambers. The method further includes the steps of inserting a portion of the workpiece into the chuck assembly, pumping hydraulic fluid uniformly into each of the first chambers until the jaws are substantially touching the perimeter of the workpiece, and adjusting one or more of the jaws to align the axis of the workpiece with the central axis of the chuck assembly by pumping hydraulic fluid into at least one of the chambers of at least one of the jaws. The method also includes the step of pumping hydraulic fluid uniformly into each of the first chambers until the jaws are clamped around the perimeter of the workpiece at a predetermined pressure.

It is an object of the invention to provide an effective technique for avoiding the influence of reaction during tightening operation in the rotary fastening tool. Representative rotary fastening tool includes a tool body, a motor housed within the tool body, a driving-side rotating member that is rotationally driven by the motor, a driven-side rotating member that is disposed coaxially with the driving-side rotating member, a tip-end side rotating member that is disposed coaxially with the driven-side rotating member and rotationally driven via the driven-side rotating member, the tip-end side rotating member driving a tool bit to perform a tightening operation and a rotation control mechanism that allows the tip-end side rotating member to rotate in the tightening direction during the tightening operation of the tool bit, wherein, when the tip-end side rotating member is fixed to a workpiece with the tool bit during the tightening operation and when torque transmission from the driving-side rotating member to the driven-side rotating member is interrupted, the rotation control mechanism locks the tip-end side rotating member and the tool body together against rotation with respect to each other to prevent the tool body from rotating in the tightening direction.

An automatic lathe is capable of rapidly and easily switching between machining of a material with a guide bush and machining of the material without the guide bush. The automatic lathe has a guide bush support table, a support table fixing device for fixing the guide bush support table, a guide member rotatably installed on the guide bush support table so as not to move forward and backward, a guide bush detachably fitted to the tip of the guide member, a driving device for rotating the guide bush, a rotation transmission device for transmitting the rotation of the guide member to the spindle, and a spindle moving device for moving the spindle forward and backward within the guide member. A spindle fixing device positions and fixes the spindle at a specified position on the guide bush support table when the guide bush is removed from the guide member.

A workpiece ejecting device for a machine tool, in which the ejecting bar cannot be rotatably driven at the time of high velocity rotation of the spindle to thereby prevent occurrence of vibration, noise and frictional heat, and so that the workpiece can be ejected smoothly. The workpiece ejecting device comprises: a front bearing unit installed at an inner peripheral surface of a front end portion of the drawing tube; an ejecting cylinder located behind the chucking cylinder and installed directly on an axial line identical with that of the front bearing unit, and an ejecting rod, wherein the ejecting rod is provided at a center axis thereof with at least one fluid passing opening through which fluid for removing alien materials is supplied, and a front end of the ejecting rod is installed to be supported by the front bearing unit.

A mechanical device for the fast exchange of jaws in a lathe plate providing an intermediate jaw support attached to the jaw holder with a straight support face and providing with a guide wherein the jaw is positioned and fixed precisely and eliminating the clearances found in the conventional method.

A mechanical device for the fast exchange of jaws in a lathe plate providing an intermediate jaw support attached to the jaw holder with a straight support face and providing with a guide wherein the jaw is positioned and fixed precisely and eliminating the clearances found in the conventional method.

A pottery holding device and method for securely holding a workpiece during rotation and working of the workpiece on a wheelhead of a pottery wheel. The pottery holding device includes a wheelhead member and at least three holding members. The wheelhead member configured for attachment to the wheelhead of a pottery wheel. The at least three holding members and wheelhead member configured to allow selective locking of the at least three holding members in positions about the periphery of a workpiece. The device adapted to securely hold circular, non-circular symmetric and irregular, asymmetric or organic shaped workpieces. The device further adapted to securely hold workpieces in positions and orientations such that the center of the workpieces is aligned with the axis of rotation of the device, and positions and orientations such that the center of the workpieces is spaced from the axis of rotation of the device.

A face driver has a body rotatable about an axis and a head rotationally fixed on the body and formed with a plurality of guides open axially forwardly toward a workpiece and radially offset from the axis. A centering rod axially shiftable in the body on the axis has a front-end point engageable with the face of the workpiece. A compression spring in the body urging the rod axially forward toward the workpiece, a driver disk has a front face engageable with the workpiece and a back face formed with a plurality of rearwardly open and radially extending grooves aligned with the guides. Respective support pins axially shiftable in the guides have heads engaged in the respective grooves so as to rotationally couple the driver disk rotationally to the body while permitting the driverd disk to tip with axial displacement of the pins.