Automatic fabric density adjusting device and yarn feeding control mechanism for a circular knitting machine

摘要

An automatic fabric-density adjusting device is provided and includes a detecting device for detecting the rotary movement of a knitting machine (30), a driving mechanism for driving a positive yam feeding device (90) in response to the signal detected by said detecting device, a controller (150) for controlling the driving mechanism to cause said yam feeding device to feed a requisite yam volume for the desired fabric, and a fabric tension sensor for detecting variations in the tension of the knit fabric and signalling the controller (150) to vary the take-up of the fabric accordingly. An automatic yam-feeding control device is also provided and comprises the yam-feeding device (90) which supplies knitting yam (Y) to the knitting needles via a yam carrier, a cylinder, which houses the knitting needles in its needle grooves, a cam holder, which faces the cylinder and is equipped with a control cam for controlling the knitting needles, and a cam ring, which supports the cam holder, and a yam tension sensor (81) for determining variations in tension and for signalling the controller (150) to vary the knit stitch volume.