Hydraulically driven web winding appts. - has shaft controlled by pressure regulating valve controlled by cam surfaces rotated by servomotor

摘要

The hydraulically driven shaft for winding web material has a pressure regulating valve (1) controlled by the drive and a servomotor (2) adjacent to it, which regulates the control arm (6) on the valve. The servomotor carries a control plate (4) with a series of sloping cam surfaces (5) on its underside for a control member (6) on the valve. The control member is a swing arm (6) on the end of the valve, with a roller (6b) secured to it, which is in contact with the cam surfaces. The servo motor also carries a rotary position indicator (19) on its output shaft. The control arm is also adjusted by a regulating knob (14) adjacent to it so that it can be swung into different contact positions with the cam surfaces, rotating about an axis parallel to the axis of the servomotor.