초록 ▼

A switching device for variable speed gears in machine tools having an assembly which includes a plurality of axially disposed, rotatably-driven cam discs, each of which is associated with an electric microswitch. Non-rotatable spacers serve to position the cam discs. A spherical key bed clamp axial

A switching device for variable speed gears in machine tools having an assembly which includes a plurality of axially disposed, rotatably-driven cam discs, each of which is associated with an electric microswitch. Non-rotatable spacers serve to position the cam discs. A spherical key bed clamp axially clamps the cam discs together while permitting rotation of individual ones thereof. A non-rotating indicating disc displays the present RPM or respective gear stage. A shock absorber in the individual gear trains between switching bars and their respective electric motors provides sufficient damping and cushioning to prevent a hard start-up impact when the motor is switched on or when a sliding gear block is engaged. The shock absorber may include an elastic linkage or an elastic spur gear in a toothed wheel gear reduction unit located between the motor drive shaft and the link shaft.

대표청구항 ▼

In a machine tool having a plurality of sliding gear blocks and associated switching bars, a switching device for variable speed gears comprising: motor means; a shaft driven by said motor means; a main drive shaft; a switching bar movable in response to rotation of said main drive shaft; a pluralit

In a machine tool having a plurality of sliding gear blocks and associated switching bars, a switching device for variable speed gears comprising: motor means; a shaft driven by said motor means; a main drive shaft; a switching bar movable in response to rotation of said main drive shaft; a plurality of gears intermeshing to form a gear train mechanically linking said motor drive shaft with said main drive shaft, said gear train and said motor means being adapted for switching through individual gear stages; a shock absorber element disposed within said gear train intermediate said shaft driven by said motor means and said switching bar; a plurality of rotatable, individually adjustable cam discs mounted in sequence axially along said main drive shaft; a plurality of switches, each one of said switches being actuable by rotation of an associated one of said cam discs; a plurality of non-rotatable, axially displaceable spacers mounted on said main drive shaft, one of said spacers being disposed between adjacent ones of said cam discs; and clamping means comprising a spherical, key-bed transmission actuated by means of threaded bolts adapted to be tightened to exert axial pressure on said cam discs and said spacers to prevent said cam discs and said spacers from rotating on said main drive shaft and to be loosened to permit rotation of individual ones of said cam discs about said main drive shaft.