Circular knitting machine for hosiery or the like

Abstract

A circular knitting machine for hosiery or the like, comprises a needle cylinder (2) which has a vertical axis and has, on its lateral surface, multiple axial slots (3), each of which accommodates a needle (4) and an actuation element (5) for the needle (4). The actuation element (5) comprises at least one connecting element (6). The connecting element (6) is provided with a movable heel (6a), which can be extracted radially from the axial slot (3), by way of the oscillation of the connecting element (6) on a radial plane of the needle cylinder (2) to make it engage connecting element actuation cams which face the lateral surface of the needle cylinder (2). The cams comprise at least one extraction cam or one retraction cam, which has a portion whose profile is inclined with respect to anideal plane which is perpendicular to the axis of the needle cylinder (2). The machine comprises extraction means (39) for causing the extraction of the movable heel (6a) of the connecting element (6) and keep the movable heel (6a) in the extracted position substantially over the entire extension of the portion having an inclined profile of the extraction cam or of the retraction cam.

Description

technical field [0001] This invention relates to a circular knitting machine for hosiery or the like. Background technique [0002] Single-cylinder and double-cylinder circular knitting machines for hosiery or the like are known. [0003] A single-cylinder circular knitting machine basically consists of a cylinder having a vertical axis and a plurality of axial slots on the sides of the cylinder, each of which accommodates a needle which can be moved along the corresponding The axial grooves are actuated into alternating movements, thereby forming the knitwear. The needle is generally provided with a heel projecting radially from a corresponding axial slot in the barrel, the needle is actuated by providing a plurality of needle actuation cams arranged around the barrel and integrally Paths are defined, shaped with ascending portions, stops or horizontal portions, and descending portions, which paths can be followed by the heel of the needle when the cylinder is actuated to...

AI Technical Summary

Problems solved by technology

[0020] In known types of knitting machines, the cooperation of the rigid selector with the selector actuating cam, in particular with said cam lifting needle or the rising part of the slider, is not always satisfactory because due to factors such as wobble Random phenomenon such as, the heel of the selector will disengage from the actuation cam, thus inaccurately or incompletely actuating the needle

Due to this, breakage or knitting errors often occur

[0021] In an attempt to solve this problem, the heel of the selector designed to mate with the selector actuating cam has the shape of a trapezoid, whereby the profile of the cam designed to mate with the heel is shaped, but this solution does not provide a sufficiently assured fit Strength, since sudden disengagement of the selector from the selector actuation cam can still occur at high actuation speeds and severe vibrations

[0022] This problem is less pronounced with spring-type oscillating selectors, since the spring reaction of the selector strengthens its engagement with the selector actuating cam, but is more of a problem with overall manipulation of the selector, since the selector must Having an additional actuator or cam in the area where the selector is to be in the rest position, avoiding it from cooperating with the selector actuating cam, would add significant complexity to the knitting machine

[0023] Moreover, the presence of a movable cam and a corresponding actuator between the needle actuating cam and the slider actuating cam is necessary for producing various knitwear, but has the problem of significantly increasing the structural complexity of the entire knitting machine

[0024] Moreover, the presence of these movable cams also obliges to provide a suitably set actuation program on the knitting machine, which can intervene and return to the movable cams before resuming knitting if the machine suddenly stops due to a power outage. correct position because if the machine is restarted without first returning to the correct position of the movable cam, the needle or the heel of the slider may break

[0025] In fact, the presence of these movable cams makes it necessary to electronically program the knitting machine to store the position of the movable cam when the power is off, which constitutes a further complication in the manufacture of the knitting machine

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