Apparatus for slitting a web into narrow webs or strips

Claim 1

An apparatus for slitting a web into narrower webs or strips, comprising: a plurality of cutters, which are movable into engagement with the web, cutter holders carrying said cutters, positioning means for adjusting said cutter holders transversely relative to the web, a common track on which the cutter holders are freely slidably mounted, clamping means for fixing said cutter holders in position on said track said clamping means comprising a brake lever pivoted to each of said cutter holders and spring urged against said common track, a push rod for disengaging each said brake lever from said track, a pneumatic cylinder for actuating said push rod, a control device adapted to release said clamping means, a feeder provided parallel to the track, the cutter holders adapted to be clamped to said feeder, the control device controlling clamping of said cutter holders to said feeder so as to permit the cutter holders to be displaced by the feeder to their desired positions, a length-measuring system, extending parallel to the common track serving to detect the actual position of each cutter holder, the length-measuring system being a non-contacting measuring apparatus comprising an ultrasonic displacement pick-up comprising a magnetostrictive rod, which is parallel to the track and a magnet, hugging said magnetostrictive rod for generation of an actual value signal, connected to each cutter holder, said magnet being connected to said push rod so that said magnet will hug said magnetostrictive rod when said brake lever is disengaged, and a trailing flexible compressed air line connected to each cutter holder.

Claim 2

An apparatus for slitting a web into narrower webs or strips, comprising: a plurality of cutters, which are movable into engagement with the web, cutter holders carrying said cutters, positioning means for adjusting said cutter holders transversely relative to the web, a common track on which the cutter holders are freely slidably mounted, clamping means for fixing said cutter holders in position on said track said clamping means comprising a brake lever pivoted to each of said cutter holders and spring urged against said common track, a push rod for disengaging each said brake lever from said track, a pneumatic cylinder for actuating said push rod, a control device adapted to release said clamping means, a feeder provided parallel to the track, the cutter holders adapted to be clamped to said feeder, the control device controlling clamping of said cutter holders to said feeder so as to permit the cutter holders to be displaced by the feeder to their desired positions, a length-measuring system, extending parallel to the common track serving to detect the actual position of each cutter holder, the length-measuring system being a non-contacting measuring apparatus comprising an ultrasonic displacement pick-up comprising a magnetostrictive rod, which is parallel to the track and a magnet, hugging said magnetostrictive rod for generation of an actual value signal, connected to each cutter holder, said magnet being connected to said push rod so that said magnet will hug said magnetostrictive rod when said brake lever is disengaged, and a trailing flexible compressed air line connected to each cutter holder.