Abstract: In a utility vehicle having a body and driven wheels rotatably fastened to the body, auxiliary driven wheels, having an outer diameter smaller than that of the driven wheels and a width equal to or smaller than that of the driven wheels, are coaxially fixed to the driven wheels.

Abstract: The synchronous motors are controlled by a three-phase AC power controller. According to an embodiment of the invention, firing points for the AC power controller are determined. A pair of two or three phases is determined from the angular position of the rotor, for which the firing points can be present for the respective A.C power controller. Actual firing points are determined from the mains voltage phase position of the phases so that only positive torque is produced.

Abstract: A controller capable of preventing response delay and generation of vibrations attributable thereto during position control of a movable part of a machine having low rigidity. A motor for driving a machine having low rigidity is subjected to position and velocity loop control. Compensation amount Q1 proportional to command velocity obtained by differentiating a position command and compensation amount Q2 proportional to second-order differentiated command acceleration are obtained. Compensation amounts Q1 and Q2 are added together, thus obtaining a velocity offset amount Vof corresponding to a estimated torsion amount. A differentiated value of the velocity offset amount is multiplied by coefficient ? to obtain a torque offset amount Tof. The velocity offset amount Vof is added to a velocity command Vcs obtained by position loop control 1. The torque offset amount Tof is added to a torque command Tc outputted in velocity loop control 2, and the result is used as a drive command to the motor.

Abstract: A control system for synchronizing a combination press line comprised of a transfer press and a double-action press.The transfer press is set as a master press and the double-action press as a slave press following the transfer press in operation.The transfer and double-action press each has a synchro coupled to respective drive shafts for detecting an angular position of each press. A comparator is provided for comparing signals from both synchros and generating a signal corresponding to a difference between signals from both synchros. The output signal from the comparator is fed only to a motor for the double-action press for controlling the speed of the motor, thus enabling the double-action press to follow the transfer press in operation.

Abstract: A lifting apparatus of the type having a number of columns supporting a load platform each column driven by an electrical, polyphase current motor whereby sensors on each column, for example potentiometers, produce a signal indicating the height of that column. The signals are applied to a comparator which in turn provides an output to one or more electronic switches, such as a triac or thyristor having a diode connected in parallel with it for conducting current in an opposite direction, each such switch connected to a winding of a motor to control the current applied so as to reduce any difference in height among the columns.

Abstract: A box making machine includes a supply roll of a continuous web whose tension is monitored by a pivotally mounted oscillating rod which guides the web by means of a dancer roller provided at one end thereof. The web is carried through an imprinting machine which prints information on the web before it is passed through a die press which punches out portions of the web at predetermined locations on the latter. A cutter machine is provided which cuts the web into blanks suitable to be formed into boxes. The cutter machine includes a drive motor for actuating the cutter and for advancing the web from the supply roll. A box forming machine is provided for operating on the blanks and for forming the same into boxes. The box forming machine includes a drive motor for actuating the box forming machine.