A stair form member attached jaw is installed with the stair form member provided at the bottom face of the soft jaw. The stair form member is held between a pair of grips in the jaw installing groove of the master jaw from both sides of the radial direction, thereby pulling the stair form member to the bottom direction of the jaw installing groove. The position of the radial direction of the soft jaw is determined by the engagement between the bottom face of the soft jaw and the upper serration faces of the master jaw; and the position of the soft jaw in the tangent line is determined by the close contact of the stair form member to the side face of the jaw installing groove.

Backing and clamping chuck jaw part (110, 120), respectively, arranged to engage with each other such that respective contact surfaces (113, 123) a rearranged to come into contact with each other so as to together form a chuck jaw (100) for a chuck (10). The invention is characterised in that the backing chuck jaw part is manufactured from a harder metal material than a metal material from which the clamping chuck jaw part is manufactured, in that a the backing chuck jaw part comprises a convex structure (126), and in that the convex structure is arranged to engage with a corresponding concave structure (116) of the clamping chuck jaw part so that the said concave structure is permanently deformed as a result of an engagement between said structures resulting from the chuck jaw parts first being arranged in a contacting orientation and thereafter being pressed together into an engagement orientation, in which contact is established between said contact surfaces. The invention also relates to a chuck jaw, a chuck and a method.

A chuck for gripping a workpiece includes: a chuck body; a jaw connected to the chuck body for constrained movement relative to the chuck body along a jaw path in jaw-closing and jaw-opening directions; an actuator body connected to the chuck body for constrained movement relative to the chuck body along an actuator path; and a slider body connected to the chuck body for constrained movement relative to the chuck body along a slider body path. The slider body is connected to the jaw for constrained movement relative to the jaw along a slider-body-to-jaw path. The slider body is connected to the actuator body for constrained movement relative to the actuator body along a slider-body-to-actuator-body path.

A structure, including first and second portions respectively having a serration in which peaks and valleys are continuous, and configured to adjust relative positions of the first and second portions in an adjustment direction by interlocking the peaks and valleys with each other. The adjustment direction is a direction in which the peaks and valleys of the serration are continuous; a fixing portion configured to maintain a defined state. The defined state is a state in which the peaks and valleys are interlocked with each other and the relative positions of the first and second portions are fixed; and a positioning mechanism provided on the second portion or the fixing portion, and having a contact portion configured to contact the first portion in the defined state.

An automatic jig replacement system includes a detection device, a robot, a bolt tightening/loosening device, and a control device. The detection device is configured to be capable of detecting a predetermined part of a jig. The robot is configured to be capable of conveying the jig. The bolt tightening/loosening device is configured to be capable of tightening/loosening a bolt for securing the jig. The control device determines a bolt tightening/loosening position, on the basis of a result of detecting the predetermined part by the detection device. The robot is caused to unload the jig from the mounting position, or to load the jig to the mounting position. The bolt tightening/loosening device is moved to the bolt tightening/loosening position, and is caused to tighten or loosen the bolt.

A structure that is mounted to industrial equipment. This structure includes a jig, a first fixing member and a second fixing member, and a grip part. The industrial equipment has an attachment/detachment region for attaching and detaching the jig. The attachment/detachment region has a first space. The jig has a second space. The first fixing member is accomodatable in the first space. The second fixing member is accomodatable in the second space. The second fixing member is configured so that the jig can be attached to and detached from the attachment/detachment region by adjusting the degree of helical engagement of the first and second fixing members. The grip part is provided to at least one of the first fixing member and the second fixing member, and is configured grippable such that, in a state in which the degree of helical engagement has been loosened, the structure can smoothly be moved.

There is disclosed a chuck jaw (10.1, 10.2, 10.3) for securing a workpiece (12) to a lathe chuck. The chuck jaw (10.1, 10.2, 10.3) includes a jaw body (16) adapted for operative mounting to the lathe chuck. The chuck jaw (10.1, 10.2, 10.3) further includes at least one holding element (18) operatively associated with the jaw body (16) and adapted to engage the workpiece (12). The at least one holding element (18) is moveable between (i) a release condition in which the holding element (18) is released from the workpiece (12), and (ii) an engaged position in which the holding element (18) engages a surface of the workpiece. The chuck jaw (10.1, 10.2, 10.3) further includes a clamping assembly (20) operatively adapted to secure the at least one holding element (18) in the engaged position.