Abstract: A motor-fastening mechanism fastens an output shaft of a motor and an input shaft of a driven member to each other. The motor-fastening mechanism has a fastening section which fastens the output shaft of the motor and the input shaft of the driven member relatively immovably, a motor-attachment member which is attached to the motor, an engaged section which is provided on either one of the motor-attachment member and the driven member, and an engaging section which is provided on the other of the motor-attachment member and the driven member and which is engaged to the engaged section such that displacement of the output shaft in a rotating direction thereof is regulated.

Abstract: A workpiece exchanging apparatus for exchanging a machined workpiece with an unmachined workpiece is provided, the workpiece exchanging apparatus including a gripping arm provided at its two longitudinal end sections with gripping sections for gripping, respectively, a machined workpiece and an unmachined workpiece, the gripping arm being able to turn around a turn axis that is positioned at a longitudinal center section of the gripping arm and being able to move linearly in the axial direction of that turn axis; a first cam mechanism for making the gripping arm turn; and a second cam mechanism for making the gripping arm linearly move.

Abstract: A motor-fastening mechanism fastens an output shaft of a motor and an input shaft of a driven member to each other. The motor-fastening mechanism has a fastening section which fastens the output shaft of the motor and the input shaft of the driven member relatively immovably, a motor-attachment member which is attached to the motor, an engaged section which is provided on either one of the motor-attachment member and the driven member, and an engaging section which is provided on the other of the motor-attachment member and the driven member and which is engaged to the engaged section such that displacement of the output shaft in a rotating direction thereof is regulated.