| 摘要 |
<p>The needle selection device for circular knitting machines has multiple selectors arranged in the axial grooves formed in the skirt of the needle cylinder, each selector being arranged below a needle and oscillatable in a radial plane of the needle cylinder from an active position, in which it protrudes radially from its groove with a butt, for the engagement of the butt with cams for actuating the selectors arranged around the needle cylinder to move the selectors along their groove in the needle cylinder so as to activate the overlying needle, to an inactive position, in which the selector is sunk in its groove in the needle cylinder so that it does not interfere with the selector actuation cams. The device has selector extraction means to transfer the selectors from the inactive position to the active position and selection means to transfer the selectors from the active position to the inactive position or to keep them in the active position. Each selector is provided with a selection element protruding radially from the grooves of the needle cylinder and oscillatable in the plane of arrangement of its selector. The selection element is made of a material that can be magnetized, and an electromagnet is provided for magnetizing the selection element and magnetic means interact with the selection element after its magnetization to make it oscillate into an idle position, in which the selection element engages a selector sinker cam which laterally faces the needle cylinder, or into an active position, wherein the selection element does not interfere with the sinker cam to keep its selector in the active position. <IMAGE></p> |
