When constructing an injection molding machine M that is equipped with hydraulic pumps 2, which control discharge flow rates by variably controlling the number of revolutions of a drive motor 3, and that drives hydraulic actuators 4a. Left and right front wheel assemblies include a pivoting fork supporting a wheel, thereby allowing directional control over the walker during use. Therefore, the particles are completely separated in a single operation by use of the micro channel having extremely simple structure, without the necessity of special machining of the channels and the like. The second clock is out of phase with the first clock by a phase in a range of 30 degrees to 150 degrees. Image data is processed to determine a 3D model from which selected dimensions for the eyeglass frames may be measured.