CS242861B2 - Finished circular fabrics drawing-off and clearing device from circular knitting frames - Google Patents

Abstract

In a circular knitting machine, a tensioning device for the article being knitted comprises a frusto-conical wall along which the article moves and a pair of annular elements with a flexible rim which act alternately on the article to urge it along the wall. The elements are concentric and are driven with a reciprocating motion. Inside the inner annular element there is a conduit which extends upwards from the flexible rim of this element. In the conduit there is created a pneumatic suction flow to reverse the article axially about said rim in the opposite direction to the direction in which the article normally extends from the narrowest region of the frusto-conical wall. The conduit opens by way of a grid into a chamber fitted above the tensioning device and which can be connected to a source of suction during knitting, and alternately to a source of pressure for expelling the finished article downwards, the chamber walls being fixed whereas the conduit rotates together with the flexible annular elements to drive same. <IMAGE>

Description

(54) Equipment for hauling and ejecting ready-made tubular knits from circular knitting machines

The device for withdrawing and withdrawing finished tubular knits from circular knitting machines comprises a tensioning device for tensioning and withdrawing the knitted fabric. The tensioning device comprises a conical wall chamber for guiding the tubular article during its formation, and at least one annular tensioning member provided with a pliable flange concentrically disposed relative to the conical wall chamber, a channel extending inside the annular tensioning member opposite the pliable flange relative to the direction in which the article normally leaves the narrowest portion of the conical wall chamber. This channel (39) is provided at its end opposite to the annular member (3,5) with a grid (14V). According to the invention, the annular tensioner (3,5) is mounted reciprocably between a position outside contact with the guide surface of the conical wall chamber (1) for guiding the tubular article, and a position in contact with this wall. The grid (14V) forms the connection between the inner cavity of the duct (39) and the chamber (A) surrounding it, wherein the chamber (A) is connected by a switch (32) to a pressure or suction source (38) and a peripheral wall (24) the chamber (A) is fixed and the channel (39) is rotatably mounted to rotate together with the annular tension member (3,5).

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for withdrawing and withdrawing finished tubular knits from circular knitting machines. In particular, the invention relates to a pull-out and pull-out device enabling the article to be turned internally outward, which is normally done at the stage following the formation of the article.

The invention is particularly intended to be combined with circular sock knitting machines provided with a mechanical tensioning device, although it may also be used to form other types of tubular knits.

British Patent Specification No. 1,552,501 discloses a device enabling mechanical tensioning of a fabric withdrawn from a knitting machine and subsequent pneumatic turning of the inner side outwards.

Pneumatic inversion is made possible by a suction device that pulls the fabric upward as the knitting and draw-off progresses, and further through a guide tube. The downward exit of the knitting machine with which the article normally leaves the knitting machine is blocked by a valve so that the device does not allow the knits to be pulled out of the knitting machine in a simple and fast manner.

In MS. U.S. Patent No. 161,245 discloses a device using pneumatic tensioning without a combination of mechanical tensioning means. However, this pneumatic tensioning device is only suitable for thin women's stockings and is not suitable for thicker knitwear, such as socks, where it is impossible to do without mechanical tensioning means.

Known devices for pulling and ejecting finished tubular articles with mechanical tensioning means essentially comprise a tensioning device for stretching and withdrawing the article, consisting of a conical wall chamber for guiding the tubular article during its formation, and at least one annular tensioning member provided with a pliable flange. concentrically disposed relative to the frusto-conical wall, wherein a channel extending inside the annular tensioner extends in a direction opposite from the yielding bead to the direction in which the article normally leaves the narrowest portion of the frusto-conical wall, which channel is provided at its end opposite to the annular member grid.

The invention overcomes the drawbacks of the known devices in that the annular tensioning member is mounted reciprocably between a position outside contact with the guide surface of a conical wall chamber for guiding the tubular article, and a position in contact with the wall, the grid forming a connection between the inner channel cavity and the chamber it surrounds the channel, wherein the chamber is connected by a switch to a source of pressure or suction, and the peripheral wall of the chamber is fixed and the channel is rotatably mounted to rotate together with the annular tension member.

The solution for withdrawing and withdrawing the finished tubular knitted fabric makes it possible to combine, in particular on sock knitting machines, a mechanical component and a pneumatic component. With the effective construction of the mechanical tensioning means, it allows the inner side of the fabric to be turned outwardly by pneumatic means, and after loosening the knitted fabric with needles, switching the suction to blowing allows the fabric to be ejected quickly and downward in a reversed state. ,

At the same time, the device according to the invention allows the fabric to be pulled straight down to check the fabric, which is usual every 100 to 200 articles. This direct ejection is not possible especially in the case of the solution according to British Patent No. 1,552,501, where the valve blocks the downstream outlet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a portion of a device according to the invention showing a cup-like tensioning device with elements for turning the product internally outwards; and FIG. The invention is connected to a source of suction and compressed air.

In the lower part of FIG. 1, a frusto-conical wall 1 is disposed within the needle cylinder of the tubular knitting machine to be turned outwardly.

This frustoconical wall 6 extends downwardly in the form of a tapered portion 1A through which the product normally passes during its manufacture.

In the frustoconical wall 1 there are further provided two annular tensioning members with a pliable flange, an inner annular tensioning member 5 and an outer annular tensioning member 5, the lower edges of which cooperate with the frustoconical wall 1 so as to tension the fabric M during its successive manufacture. is allowed to slide along the frustoconical wall 7.

AND

The two annular tensioning members 6, 6 are each driven to perform a reciprocating movement and the two are alternating relative to each other. The drive is obtained by means of an annular axial cam 1 with which two tappets 9 and 10 interact to lift the two coaxial members 12 and 14.

These coaxial elongated members 12 and 14 are rigidly connected to the carriers of respective annular tensioning members 5 and 3. The tappets 9 and 10 interacting with the cam 10 are actuated by return springs 20 and 22.

The alternating reciprocating movement of the two annular tensioning members 3 and 5 results in the fabric moving along the frustoconical wall 6. In this case, each annular tensioning member 3 and 5 acts when the other is raised to ensure uniform tension of the fabric M.

The annular tension member 6 is actuated by an inner elongate member 14, which in the illustrated embodiment is tubular and replaces an inner rod, which need not be tubular, and which is typically present in conventional tensioning mechanisms of this type.

The tubular elongate member 14 defining a vertical channel 39 within it extends upwardly by an upper portion 14A terminated by a perforated portion in the form of a grid 14B which is opened into a chamber A bounded by a peripheral wall 24 which is mounted on a fixed structure 26 of the tensioning device.

Above, the peripheral wall 24 is connected to a coupling 28 with a hose 30 which leads to a switch 32 in the form of a valve. This valve is a four-way type, with one discharge outlet 32A, and couplings for two ducts 34 and 36 extending one to the suction side and one to the discharge side of the fan or suction source 38 to achieve suction or injection of gas, especially air, into Chamber A.

In forming the article M and tensioning it, a vacuum is introduced into the chamber A by suction, so that a suction flow is generated in the channel 39 in the direction f 1, which turns the article M around the edge of the annular tensioner 3. Thus, during the formation of the article M, the fabric turns inside out against the condition it would occupy if it continued to move along the extension 1A of the frustoconical wall 6.

When knitting is complete and the finished article has been separated from the needle cylinder, the position of the valve 32 is moved such that air is blown into the chamber A, which expels the finished article along the length of the channel 39 in the direction opposite to the direction f1.

Claims (1)

OBJECT OF THE INVENTION2U Apparatus for withdrawing and withdrawing finished tubular knits from circular knitting machines, comprising a tensioning device for tensioning and withdrawing the knitted fabric, comprising a conical wall chamber for guiding the tubular knitted fabric during its formation, and at least one annular tensioner with a pliable flange concentrically arranged a tapered wall chamber, wherein a channel extending inside the annular tensioner extends in a direction opposite from the yielding bead to the direction in which the article normally leaves the narrowest portion of the tapered wall chamber, the channel having a lattice at the end thereof characterized in that the annular tensioner (3, 5) is mounted reciprocably between the out-of-contact position and the guide surface of the conical wall chamber (1) for guiding the tubular article, and in a position in contact with said wall, The channel (14Б) forms a connection between the inner cavity of the channel (39) and the chamber (A) that surrounds the channel, wherein the chamber (1) is connected by a switch (32) to a vacuum or suction source (38) and a peripheral wall (24). the chamber (16) is fixed and the channel (39) is rotatably mounted to rotate together with the annular tensioner (3, 5).