Mitsubishi Denki Kabushiki Kaisha

Obayashi Corporation

Hiroshi Sugie

Kyoji Yoshino

Junichi Takiguchi

Tatsuya Wakisaka

Fumihiro Inoue

A backlash compensation device for use with a numerically controlled system compensates for a position command signal used to drive and control an object to be controlled. The device includes a reversal detecting unit for detecting a reversal of a direction of driving the object to be controlled based on a reversal of an upward or downward trend in the level of an applied position command signal. A maximum backlash signal generating unit generates a maximum backlash signal corresponding to a maximum value of backlash error every time a reversal of a direction of driving the object is detected. A filter then reduces the level of the maximum backlash signal according to how much time has elapsed since the detected reversal of the driving direction. An adder adds the reduced maximum backlash signal from the filter to the position command signal.

Numerically controlled system and backlash compensation device for use with the system

When material transport was automated on a building construction site, in a conventional travel tape guide system, it was necessary to replace the tape when it became soiled or when changes were made to a travel route. As a result, the usage efficiency of a material transport vehicle could not be improved on the site due to the fact that changes are made to work floors as demanded by construction schedules. According to this invention, there is provided a sign which is easy to move and which is installed at a turning point or an unloading point on a work floor transport route. An image of the sign is obtained by an imaging device on an autonomous guided vehicle and operating instructions are recognized by image processing. This makes it possible to automate the setting of routes and the control of the vehicle.

Growing community of inventors

Tokyo, Japan

Hiroshi Sugie