Abstract: Adjustable stoppers for limiting the angle at which pivotal gripper jaws are opened. The stoppers include a stop block and at least one stopper pad which is made from a shock absorbing material such as urethane. The stoppers are secured to a pivotal one of a pair of gripper jaw members of a parts gripper and positioned to abut the other of the pair of gripper jaw members. Stoppers which are provided with two or more stopper pads of different lengths are reversible and can be used to adjust the angle at which the jaw members open. A mounting assembly which includes a mounting plate, and clamping plate and a spherical collar therebetween can be used to mount a workpiece holder from the rear or at a side. Providing the mounting plate with a central circular bore allows a cylindrical support member to be inserted therein and thus axially aligned with the mounting plate.

Abstract: An adjustable positioning target assembly for use in a positioning device includes a target member that is secured in a desired position in an internally threaded bore between a pair of set screws. The internally threaded bore is provided in body of a positioning device. Proximity sensors which respond to the target member are coupled to an element of the positioning device. The body and element of the positioning device are movable with respect to one another. The target member and set screws can include through-holes which allow the target member and set screws to be adjustably positioned in the internally threaded bore by a driver tool. The adjustable positioning target assembly can be used in cooperation with gripper jaws or other positioning devices.