초록 ▼

A levelling system for a camera crane employs a tachometer directly coupled to a horizontal pivot of the crane. The output of this tachometer is used to control a motor which by means of a worm and worm gear controls the level of a camera remote head. A second tachometer is associated with the worm

A levelling system for a camera crane employs a tachometer directly coupled to a horizontal pivot of the crane. The output of this tachometer is used to control a motor which by means of a worm and worm gear controls the level of a camera remote head. A second tachometer is associated with the worm in order to provide a feedback signal to the servo-amplifier so as to maintain the motions of the boom about the pivot and the worm gear in synchronism.

대표청구항 ▼

A levelling system for use with a camera crane having a telescopic boom mounted on a horizontal pivot, the system comprising a levelling head adapted to be fitted to the boom and provided with a motor and a camera remote head mounting operatively connected to said motor to enable the mounting to be

A levelling system for use with a camera crane having a telescopic boom mounted on a horizontal pivot, the system comprising a levelling head adapted to be fitted to the boom and provided with a motor and a camera remote head mounting operatively connected to said motor to enable the mounting to be rotated about a horizontal axis, a control circuit for providing control signals to said motor, respective sensing means for direct association with a boom pivot and said motor operative to provide input signals to said control circuit, said control circuit being operative to maintain a camera remote head mounted to said mounting level during all motions of the crane.