Abstract:
Double-cylinder circular knitting machine for hosiery or the like. The machine comprises a lower needle cylinder having a substantially vertical axis and an upper needle cylinder that is arranged above and coaxially with respect to the lower needle cylinder. A plurality of axial grooves is formed in the skirt of the needle cylinders and each groove accommodates a double-beak needle that can move axially along the corresponding groove. In each one of the grooves there is a lower pusher, which is arranged below the needle and faces the lower head of the needle with its upper end, and an upper pusher, which is arranged above the needle and faces the upper head of the needle with its lower end. Cams are provided for the actuation of the lower pushers and of the upper pushers to make them slide upwards or downwards in their respective grooves to push up or down the interposed needles located in the lower or in the upper needle cylinder or to transfer the needles from the lower to the upper needle cylinder or vice versa.
Abstract:
The thread cutting and aspiration unit has a vertical cutter supporting post which is shifted towards the axis of a toothed thread trimming disk. A cutting blade associated with each cutter is mounted at the end of a lower L-shaped portion of a corresponding supporting post. The L-shaped portion allows thread to pass beyond the cutter and to be cut by a following blade, so that a considerable length of thread can be aspirated by an aspiration port.
Abstract:
A unit is disclosed for transmitting motion to the hosiery suction tube in a circular knitting machine of the type having a fixed supporting plate to which a cylinder support with a vertical axis, an internal hosiery passage tube that is coaxial to the cylinder support, and an underlying perforated tube are rotatably coupled. The unit has respective flanges rigidly coupled below the cylinder support and above the perforated tube and supporting respective pluralities of permanent magnets that are distributed in an annular fashion and constitute a magnetic coupling between the flanges for the rotary actuation of the perforated tube. A collar of a material that has high magnetic reluctance is arranged in the air gap formed between the rings of facing magnets and has a device for rotary coupling to the hosiery passage and a device for selective coupling to said flanges or to said fixed supporting plate for causing or stopping the rotation of the hosiery passage tube.
Abstract:
An impact protection device for a rod for positioning thread guides in a circular knitting machine. The thread guide has an approach and spacing unit formed of a rod and crank system. The end of the rod carries the thread guide and an intermediate region of the rod has a longitudinal slot which is slidably guided on a stud that is rigidly coupled to a fixed arm. The device has a compression spring mounted on the stud which presses the rod against the arm. Elastic elements mounted on a rod articulation pivot pus the rod against the crank. The spring and elastic elements allow small movements of the rod from the plane of arrangement of the path of the rod in case of impact with, or scraping against, another rod.