CPC B25H 1/0028 (2013.01) [B65H 75/483 (2013.01); B65H 75/486 (2013.01)] | 6 Claims |
1. A balancer for tools comprises a rotary drum configured for winding and unwinding a cable, which is adapted with a free end thereof to support a tool, and a spring, wound around a main rotation axis of said drum, which is adapted to develop an elastic reaction contrasting the unwinding of said cable, further comprising a measurement transducer configured for measuring at least one parameter correlated to the rotation of said drum about said main axis and a respective assembly configured for supplying electric power to said transducer, wherein said transducer is an encoder adapted to measure the rotation or a number of revolutions of said drum about said main axis, further comprising gear means, interposed between said main axis and an input shaft of a converter, for varying the number of revolutions.
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