CS261977B1 - Method of loops forming and circular knitting machine for producing of it - Google Patents

Abstract

In a method of forming stitches in a circular knitting machine for the production of hosiery and the like goods by means of needles (2) and knock over sinkers (3) so that at the end of lowering the needles (2), over-tensioning of the sinker loops of the stitches (01) is prevented, the working edges of the sinkers have slanted parts (33) corresponding in inclination to the end portion of the working edges of the stitch cams whereby the length of the loops is maintained constant as the sinkers move inwardly. <IMAGE>

Description

The invention relates to a circular single-cylinder knitting machine for the manufacture of hosiery or the like, provided with axially movable needles and radially rectilinearly movable sinkers provided with working edges.

Single-cylinder knitting machines are known for the production of hosiery, for example according to AO 229 020, where the stitches are formed by pulling the yarn through the needles over the working edges of the discard sinkers. On these machines, due to the high operating speeds of the needle cylinder, the needle retract locks are adapted so that their functional edges have slight angles with a relatively large edge radius at the point of deepest retraction. If this is not the case, the needles are overrun, resulting in breakage of the locks and breaking of the hooks of the needles.

The gradual pulling of the needles entails excessive tensioning and tearing of the loops, since the loops of the forming stitches extend over a plurality of needles over the edges of the discard.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the aforementioned disadvantage, which is essentially accomplished in that the working edges of the discards are designed such that the horizontal working edge is connected to an inclined working edge. the working edges of the retractable needle lock at the point of needle retraction.

The advantage of the invention is that it allows the use of slight angles of the retractable needle lock and thus its radii at the point of retraction, and consequently increases the arcs of the discs for operating the ejection sinkers, thereby substantially increasing the rotation speed of the needle cylinder.

The apparatus for carrying out the method according to the invention is illustrated in the drawings, in which:

Fig. 1 is a retractable lock and counter-lock showing the course of the needle nipples; Fig. 2 schematically shows the position of the sinkers to the needles during the stitch formation phase from above; Fig. 2, Fig. 7 is an axial cross-section of the needle cylinder and the platinum ring, respectively. lid.

The known hosiery circular knitting machine for the manufacture of hosiery is provided with a needle cylinder 1 (Fig. 7) in which the needles 2 cooperate axially in translation to form the stitches 3. The ejection sinkers 3 are radially displaceable in the sinker ring 4. and are actuated by platinum rings 5 housed in the lid 6. For retracting the stitches, the individual knitting systems are equipped with retracting locks 7 (Fig. 1) with associated anti-locks 8.

The discharge sinkers 3 are provided in their front part with a horizontal working edge 31 (FIG. 4) that breaks at point 32, and a downwardly sloping working edge 33 is provided. The inclined working edge 33 opens into the throat of the discard sink 34, which is formed below the hook 34.

In knitting, the function of the device described above is as follows. The knees 22 of the needles 2 are retracted by the retracting lock 7 and the hooks of the descending needles 2 retract the yarn P (FIG. 3) over the horizontal working edges 31 of the discard sinkers 3. This procedure first creates loops from said yarn P. (Figure 4) and after passing through the old stitches O, new stitches O1 are formed from said loops (FIG. 5). During the process of retracting the stitches Ol by needles 2 on the retracting lock 7, the platinum ring 5 extends towards S (Fig. 2) of the discarding sinker 3 towards the needles 2. Up to the point В of the retracting lock 7 31.

Upon further rotation, i.e. beyond the retracting point 7 of the retractable lock 7, the discard sinkers 3 are extended such that the sinker loops of the new stitches O1 fall beyond the point 32 of the discard sinkers 3 and are folded over the inclined working edges 33 as shown in FIG. As a result, the platinum loops of the stitches O1 are released, but the needles 2 are further retracted by the retracting lock. 7 to point 2.

However, since the inclination of the inclined working edge 33 of the retractable sinker 3 corresponds to a decrease or to a decrease of approx. the inclination of the working edge of the retractable lock 7 between points В and Z, there is no longer an extension of the length of the new loop Ol and its length remains constant with respect to the retraction of the needle 2 resp. The ejection of the ejector 3 in the S direction is now complete. new eyes Ol. Further movement of needles 2, resp. of the ejection sinkers 3 is no longer functional with respect to the stitch length, and therefore the shapes of the locks to operate them can be very gradual, allowing high rotational speeds.

Claims (1)

Circular single cylinder knitting machine for the production of hosiery or the like, provided with axially movable needles and radially linearly movable sinkers provided with working edges, characterized in that the working edges of the throwing sinkers are formed such that a horizontal working edge (31) adjoins an inclined working edge (33), which passes into the throat (34) of the ejector (3), wherein the inclination of the inclined working edge (33) corresponds to the inclination of the working edge of the retractable lock (7) of the needles (2) at the end of the needle retraction.