GB2200141A

GB2200141A - Method of forming stitches and circular knitting machine to perform said method

Info

Publication number: GB2200141A
Application number: GB08800136A
Authority: GB
Inventors: Vladimir Salomoun; Otokar Chladek; Josei Pialek; Jindrich Novacek; Karel Klumpar; Jarmila Uhlirova
Original assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Current assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Priority date: 1987-01-05
Filing date: 1988-01-05
Publication date: 1988-07-27
Anticipated expiration: 2008-01-05
Also published as: CS261977B1; CS7687A1; DE3744305C2; IT1215661B; IT8819005A0; GB8800136D0; GB2200141B; DE3744305A1

Description

A 9 1 1 L T'20 0 14 1 Method of forming stitches and circuLar knitting

machine to perform said method.

Description

The invention reLates to forming stitches in a circutar knitting machine for the production of hosiery and the-Like goods by means of needLes and knock over sinkers.

Single-cyLinder knitting machines for the production of hosiery goods are known, for exampLe according to the Certificate of Invention No. 229,020, where stitches are formed by drawing the thread by the needLes over the working edges of knock over sinkers. Due to high operationaL revoLutions of the needLe cyLinders of said machines the needLe stitch cams are arranged so, that their operationaL edges show gentLe angLes with reLativeLy Large radius of the edge i,n the pLace of the deepest Lowering. if this is not the case, overrunning of the needLes takes pLace, what resuLts in damages to the counter-cam and in breaking of the. needLe hooks. 20 But gentLe Lowering of the needLes resuLts in excessive tensioning and breakage of the Loops, because-the Loops of the stitches being formed are drawn over more edges of the knock over sinkers by a higher number of needLes. 25 The aim of the invention is to eLiminate the above mentioned disadvantage. According to one aspect of the invention there is provided a method of forming stitches in a circuLar knitting machine for the production of hosiery and the Like goods by means of needLes and knock over sinkers, wherein at the end of Lowering the needLes the sinker Loops of the stitches are Loosened by a movement of the knock over sinkers, their Length remaining constant.

According to another aspect of the invention there is provided a circuLar knitting machine for the production of hosiery and the like goods, comprising axially slidable needles and radiatly straight inoving knock over sinkers provided with working edges', wherein the working edges of the knock over sinkers are arranged so that after a -5 horizontat working edge there follows a slanted working edge which Leads into a throat of the knock over sinker, while the inclination of the working edge corresponds to the inclination of the working edge of the stitch cam of the needles in the place of the end of Lowering needles.

The advantage of the invention is the fact that it is possible to use gentle angles of the needle stitch cam and hence also its radii in the place of Lowering and consequently to increase the arcs of the cam ring controlling the knock over sinkers, owing to which it is possible to increase substantially the speed of the needle cylinder rotation and thus the output of the machine.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 illustrates a stitch cam and a counter-cam with the needle butts course; Fig. 2 illustrates in plan the positions of knock over sinkers with regard to the needles' during the phase of stitch formation; Fig.- 3 is a front view of the course of drawing the thread by the needles and knock over sinkers; Figs. 4 up to 6 illustrate the course of forming the stitches by a needle and a knock over sinker in the positions according to sections A-A, B-Be C-C in Fig. 2;and Fig. 7 is an axial section of the needle cylinder and the sinker cam ring or the cover.

A singLe-cytinder circular _knitting machine for the production of hosiery goods is provided with a needle cylinder 1 (Fig. 7) in which there are axially slidable needles 2 which cooperate, when forming the stitches, k IP with knock over sinkers 3. Knock over sinkers 3 are Located radiatLy slidabte in a sinker ring 4 and they are controlled by-sinker cam rings 5 Located in a cover 6. Individual knitting feeds are provided with stitch cams 7 (Fig. 1) with attocated counter-cams 8 to draw the stitches.

- Knock over sinkers 3 are in their front part provided with a horizontal working edge 31 (Fig. 4), which is in the point 32 broken and further there is a slanted working edge 33 sloping downwards. The slanted working edge 33 Leads into a throat 34 of the knock over sinker, which is arranged under a hook 34.

- The operation of the above described device when knitting is as follows. The butts 22 of the needles 2 are Lowered by the stitch cam 7 and the hooks of sinking needles 2 draw the thread P (Fig. 3) over horizontal working edges 31 of the knock over sinkers 3. During this procedure first the Loops from said thread P are formed, which are not yet drawn through the old stitches 0 (Fig. 4) and after drawing them through the old stitches 0 said Loops form new stitches 01 (Fig. 5). During the process of drawing the stitches 01 by the needles 2 in the stitch cam 7, the knock over sinkers 3 (Fig. 2) are moved by the sinker cam ring 5 in the direction S towards the needles 2. UP to the point B of the stitch cam 7 the sinker Loops of new stitches 01 are bent over horizontal working edges 31. During further rotation, ie. after the point B of the stitch cam 7, the knock over sinkers 3 are advanced SO that the sinker loops of the new stitches 01 get behind the point 32 of the knock over sinkers 3 and are bent over the slanted working edges 33, as evident in Fig. 6. Thus loosening of the sinker loops of the stitches 01 takes place, white the needles 2 are further Lowered by the stitch cam 7 up to the place 2. But because the inclination of the slant working edge 33 of the- knock over sinker 3 corresponds to the drop or to the inclination of the working edge of the stitch cam 7 between the points B and Z, no increase in the length of the new stitch 01 takes place and its length remains constant with regard to lowering of the needles 2, or to the advance of the knock over sinkers 3 in the direction S. New stitches 01 are finished and drawn already in point B. Further motion of the needles 2, or of the knock over sinkers 3 is not operational with regard to the length of the stitch and the shapes of the cams designed to control them can be very gentle which enables 10 high rotational speeds to be used.

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Claims

1. A rn.ethod of forming stitches in a circular knitting machine for the production of hosiery and the Like goods by means of needles and knock over sinkers. wherein at the end of Lowering the needles the sinker Loops of the stitches are Loosened by a movement of the knock over sinkers, their Length remaining constant.

2. A circular knitting machine for the production of hosiery and the Like goods, comprising axially stidabLe needles and radiaLLy straight moving knock over sinkers provided with working edges,, wherein the working edges of the knock over sinkers are arranged so that after a horizontal work ing edge there follows a slanted working edge which Leads into a thro-at of the knock over sinker, 1-5 while the inclination of the working edge corresponds to the inclination of the working edge of the stitch cam of the needles in the place of the end of Lowering the needles.

3. A method of forming stitches in a circular knitting machine, substantially as hereinbefore described with reference to the accompanying drawings.

4. A circular knitting machine substantially as hereinbefore described with reference to the accompanying drawings.

Published 1988 at T he Patent Office, State House, 68.71 High Holborn, London WCIR 4TP. Further copies may be obtained from The Patent OMce, Wes Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, at Mary Cray, Kent. Con. 1/87.

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