GB2027757A

GB2027757A - Warp Knitting Machine, more particularly Crochet Galloon Machine for the Manufacture of Jacquard-patterned Pile Loop Knitted Fabrics

Info

Publication number: GB2027757A
Application number: GB7928867A
Authority: GB
Original assignee: Wirkmaschinenbau Karl Marx Veb
Current assignee: Wirkmaschinenbau Karl Marx Veb
Priority date: 1978-08-21
Filing date: 1979-08-20
Publication date: 1980-02-27
Also published as: DE2919344A1; DD140767B1; GB2027757B; JPS5530487A; JPS641577B2; DE2919344C2; CS220426B1; SU1054466A1; IT7949972A0; IT1162368B; DD140767A1; BE878345A

Abstract

A crochet galloon machine for making of jacquard-patterned pile loop knitted fabrics, has sliding latch needles 1 which are reciprocable horizontally between vertical plates 5 which support the pile loops and includes a thread guide bar 8 for feeding the knitting threads, a guide bar 6 carrying thread guides 7 for laying a partial weft in a ground fabric, a plurality of pile thread guides 11 associated with each needle 1, means 13 for selecting the patterning pile thread 10a, plates 18 for laying the patterning pile thread 10a in the needle hooks, and means for underlapping each non-patterning pile thread 10, the threads 10, 10a being guided by a reed 15 displaceable horizontally in the direction of the row of needles 1 and also vertically. The reed 15 is movable substantially above the bottom edge of the needles 1 and has for guiding threads 10, 10a first gaps closed on the knocking-over side as far as the bottom edge of the reed 15. Second gaps in reed 15 between the first gaps can receive the needles 1 and plates 18. <IMAGE>

Description

SPECIFICATION Warp Knitting Machine, More Particularly Crochet Galloon Machine for the Manufacture of Jacquard-patterned Pile Loop Knitted Fabrics This invention relates to a warp knitting machine for manufacturing a jacquard-patterned pile loop knitted fabric of the kind having a knitted ground fabric consisting of wales formed in chain stitch and weft threads laid-in between the needle and sinker stitches of the wales, the ground fabric having a plurality of pile threads per wale, of which one is always laid-in as a stitch, forming a pile lug, while the other, non-patterning pile threads are laid-in as a non-knitted weft.

The invention relates more particularly to a warp knitting machine, for example a crochet galloon machine for the manufacture of jacquardpatterned pile loop fabrics of the kind having a row of hooked sliding latch needles, a thread guide bar for feeding the knitting thread, at least one insert weft layer, a plurality of pile thread guides associated with each needle, means for selecting the patterning pile thread, means for laying the patterning pile thread in the needle, means for underlapping each non-patterning pile thread, and pile plates engageable between the needles.

A warp knitting machine of the foregoing kind is known in which there is associated with each needle a laterally rackable multi-pile thread guide which can be lowered between the row of needles in each second row of stitches and whose thread outlet apertures are disposed substantially parallel with the needle shaft. A thread selecting plate provided for each multi-thread guide is formed with a groove open in the direction of the needle and associable, in accordance with the pattern, with each of the thread outlet openings of the multi-thread guide. The thread selecting plate selects each patterning pile thread and lays it in the needle hook (German Democratic Republic Patent Specifications Nos. 110 073 and 11 9 275).

With coarse finenesses, this arrangement enables a jacquard-patterned pile loop knitted fabric of the foregoing kind to be manufactured with high productivity.

More particularly with a fairly large number of pile threads per wale, the substantially reversed synthetic pile thread material conveniently used for this purpose results in errors in the selection of the patterning pile thread by the thread-selecting plate and at places where during their forward movement the needles penetrate the pile threads.

The result is either errors in the patterning or errors in the whole binding, so that the pile loop knitted fabrics produced are of inferior quality, more particularly in the case of goods with several groups and relatively high fineness.

It is therefore the aim of the invention to enable jacquard-patterned pile loop knitted fabrics of the foregoing kind to be manufactured with relatively high fineness and/or multiple patterning, while maintaining satisfactory quality.

it is an object of the invention effectively to separate from one another the patterning pilethreads and the non-patterning pile threads in each phase of the knitting operation and so to guide the plurality of pile threads during the forward movement of the needles as to prevent the needles from splicing the pile threads open.

Accordingly, the present invention consists in a warp knitting machine, more particularly a crochet galloon machine for the manufacture of jacquard-patterned pile loop knitted fabrics, having a row of hooked sliding latch needles, a thread guide bar for feeding the knitting threads, at least one insert weft layer, a plurality of pile thread guides associated with each needle, means for selecting the patterning pile thread, means for laying the patterning pile thread in the needle hooks, means for underlapping each nonpatterning pile thread, and pile plates engageable between the needles, characterised in that the pile threads are fed by a reed, which is displaceable horizontally in the direction of the row of needles and also vertically, and for each pile thread a pile thread guide is provided which serves for the selection of each patterning pile thread and is adjustable within the needle spacing, the reed being movable substantially above the bottom edge of the needles and having for the guidance of the pile threads first gaps which are closed on the knocking-over side as far as the bottom end of the reed, the reed having second gaps which are located between the first gaps and temporarily receive the needles and a thread laying-in plate.

According to an optional feature of the invention the pile thread guides are constituted by pivotable plates which are actuatable in accordance with the pattern and are provided for the displacement of each pile thread required for patterning in the needle-advancing direction, the pivotable plates being arranged above the row of needles and having their pivot in front of the upper edge of the needle.

According to a further optional feature of the invention the guide reed is triangular in shape, the edge of the reed adjacent the knocking-over side extending perpendicularly to the plane of the needles immediately in front of the pile plates, the laying-in edge of the reed extending upwardly at an inclination to the needle-advancing direction, and the top edge of the reed extending at substantially right angles to the direction in which the fed pile threads not intended for patterning run.

Advantageously each pivoting plate is controllable against the force of a spring by a conventional jacquard mechanism.

Preferably, an intermediate store is provided for the items of pattern information delivered from the jacquard machine for each pattern stage.

In order that the invention may be more readily understood, reference is made to the accompanying drawings which illustrate diagrammaticaily and by way of example an embodiment thereof, in which: Fig. 1 is a cross-section through the knitting station of the warp knitting machine according to the invention; Fig. 2 is a cross-section through a store for the pattern information delivered from the jacquard machine for each pattern stage; Figs. 3, 5 and 7 are each cross-sections through the knitting station of the warp knitting machine according to the invention, to an enlarged scale in comparison with Fig. 1, and shown in different phases of a knitting cycle; and Figs. 4, 6 and 8 are cross-sections on the lines IV--IV, VI--VI and VIlI-VIlI respectively of Figs.

3, 5 and 7.

A warp knitting machine has horizontally movable hooked sliding latch needles 1 cooperating with controlled slides 2. The needles 1 are guided in a knocking-over comb 3 and engage through downwardly directed pile plates 5 attached to a stationary bar 4. Disposed behind the pile plates 5 is a guide bar 6 carrying weft thread guides 7 which lay a partial weft in a ground fabric (not shown). Furthermore, there is provided in conventional manner a chain-stitchperforming guide bar 8 with thread guides 9 for processing the knitting threads. For feeding the pile thread 10, a plurality of pivotable plates 11, adjustable in accordance with the pattern within a needle spacing, are provided per needle 1.The pivotable plates 11 are mounted on a stationary shaft 12 and can be actuated by suitable cords 1 3a, 1 3b from a conventional jacquard machine (not shown) against the force of a respective spring 14. To guide the pile threads 10 after they emerge from the guide eyes of the pivotable plates 11 in the zone as far as the stitch-forming station, a reed 1 5 is provided which has for guiding the pile threads 10 first gaps 1 6 extending in the vertical direction, second gaps 19 being provided disposed between the first gaps, for the temporary reception of the needles 1 and thread laying-in plates 1 8 retained in a bar 17.The reed 15 is triangular in shape, the side of the reed adjacent the knocking-over side extending perpendicularly to the plane of the needles immediately in front of the pile plates 5, the laying-in (bottom) edge of the reed extending upwards at an angle to the direction in which the needles are moved forward and the top edge of the reed 1 5 extending at substantially right angles to the approaching pile threads which are not intended for patterning. The reed is preferably made up of plates 20 of U-shaped cross-section which are retained in a bar 21 (Figs. 1, 3 and 4).

In the embodiment illustrated the cords 13 are not connected directly to the jacquard machine but are connected to a storage for the pattern information delivered from the jacquard machine for each pattern stage, to ensure that the jacquard machine runs smoothly even at high speeds. To this end the cords 13, which run over shafts 22a, 22b, are connected to plates 23 which are guided in a stationary bar 24 and in their inoperative position bear against the bar 24 and against a stop 25 under the force of the springs 14 (cf. Fig.

1). Disposed beneath each plate 23 is a pivotable lever 27 which is loaded by a spring 26 and which is connected at one end by means of a harness cord 28 to the jacquard machine, and which can be pivoted at its other end. Each of the plates 23 is also formed with a recess 29, a knife strip 30 displaceable horizontally in the iongitudinal direction of the plates 23 being associated with all the plates 23.

The warp knitting machine according to the invention operates as follows: When the needle 1 is in the knocking-over position, the partial weft is laid beneath the needle hooks by the weft thread guides 7 (Figs. 3 and 4). The reed 1 5 is then racked laterally by one needle spacing, so that the pile threads 10 underlap the needles 1.

At the same time the needles 1 are moved forward (to the right as viewed in Fig. 5) and after the racking of the reed the needles 1 emerge from the pile plates 5 and enter the gaps 19 in the reed 1 5. The fact that the pile threads 10 emerge from the reed 1 5 below the lower edges of the needles 1 reliably prevents any piercing of the pile threads 10. In the meantime the patterning pile thread, for instance the pile thread 1 Oa, is moved into the position illustrated in Fig. 1 by the adjustment of its pivotable plate 11.

The pivotable plate 1 is adjusted by the tensioning of the appropriate harness cord, for example, harness cord 28a (Fig. 2). The tensioning of the harness cord 28a raises the pivotable lever 27a, a lug of which lifts the plate 23a, so that the recess 29a moves into the zone of the knife strip 30a and, when the latter makes its stroke, lifts the plate 23a off the stop 25a. As a result the cord 1 3a adjusts the pivotable plate 11 against the force of the associated spring 14.

When the needles 1 are further advanced, the reed 1 5 is lifted, laterally racked by 1.5 needle spacing above the needle plane, and then occupies the position illustrated in Figs. 5 and 6.

The guide bar 8 is racked and lowered; then the bar 17, rackable laterally together with the reed 15, is lowered, and the thread laying-in plate 1 8 lays the patterning pile thread 1 Oa in the needle hook (Fig. 5). The needle 1 starts its knockingover movement and in known manner forms a stitch from the patterning pile thread and the knitting thread. While the stitch of the patterning pile thread 1 Oa is lapped over the pile plates 5 and forms a pile loop, the knitting thread bounds in the partial wefts and the non-patterning pile threads as a non-knitting weft.

As long as the needle 1 is in its knocking-over position, the partial weft is again lapped under the needle hooks by means of the weft thread guide 1 7. At the same time the reed 1 5 is again racked to the right by 2.5 needle spacings. During the subsequent forward movement of the needles 1 the reed 1 5 at first lies low, so that the pile threads 10 cannot be pierced by the needles 1.

With the further advance of the needles 1 the reed 1 5 lifts to a slight extent, so that the needles 1 can pass more readily through the gaps between the patterning and non-patterning pile threads (Figs. 7 and 8). At the same time the pivotable plate 11 of the patterning pile thread 1 Oa is slowly pivoted back into its starting position. When the needles 1 have been completely advanced, the reed 1 5 is fully lowered, as a result of which the patterning pile thread 1 Oa is again laid into the needle hook, and when the needles 1 are retracted, the patterning pile thread is stitched together with the knitting thread, which has previously already been laid in the needle hook by the guide bar 8, so that the condition illustrated in Figs. 3 and 4 is reached again.

Before the patterning pile thread can be reselected by the harness cords 28a, 28b of the jacquard machine, the displaced plates 23a, 23b must be returned to their starting position. This is done during the return stroke of the knife strips 30a, 30b. After the plates 23a, 23b have come into abutment with the stops 25a, 25b the knife strip 30a, 30b is released from the recess 29a, 29b and by the force of the springs 14 and their own weight the plates 23a, 23h drop back into their original position, in which they bear fully against the bar 24a, 24h. Of course, the selection of the levers 27a, 27b is not limited to the use of a conventional jacquard machine with harness cords. For example, it would be quite conceivable for the levers 27a, 27b to be selected by a respective solenoid controllable in accordance with the pattern.

It should also be noted that with the warp knitting machine according to the invention even deviations from the afore-described stitch forming cycle are conceivable, without exceeding the scope of the invention. For example, the vertical shifting of the bar 1 7 might be so devised in magnitude and time that the lateral racking movement of the reed 1 5 cannot be adversely affected thereby. In that case there would be no need for any lateral racking movement of the bar 17 (synchronously with the reed 15).

The patterning pile thread might also be laid into the needle hook in each row of stitches by the thread laying-in plates 1 8 and not, as in the embodiment described hereinbefore, alternately by the thread laying-in plates 18 and the reed 1 5.

Claims

1. A warp knitting machine, more particularly a crochet galloon machine for the manufacture of jacquard-patterned pile loop knitted fabrics, having a row of hooked sliding latch needles, a thread guide bar for feeding the knitting threads, at least one insert weft layer, a plurality of pile thread guides associated with each needle, means for selecting the patterning pile thread, means for laying the patterning pile thread in the needle hooks, means for underlapping each nonpatterning pile thread, and pile plates engageable between the needles, characterised in that the pile threads are fed by a reed, which is displaceable horizontally in the direction of the row of needles and also vertically, and for each pile thread a pile thread guide is provided which serves for the selection of each patterning pile thread and is adjustable within the needle spacing, the reed being movable substantially above the bottom edge of the needles and having for the guidance of the pile threads first gaps which are closed on the knocking-over side as far as the bottom end of the reed, the reed having second gaps which are located between the first gaps and temporally receive the needles and a thread laying-in plate.

2. Warp knitting machine as claimed in claim 1, wherein the pile thread guides are constituted by pivotable plates which are actuatabie in accordance with the pattern and are provided for the displacement of each pile thread required for patterning in the needle-advancing direction, the pivotable plates being arranged above the row of needles and having their pivot in front of the upper edge of the needle.

3. Warp knitting machine as claimed in claim 1, wherein the guide reed is triangular in shape, the edge of the reed adjacent the knocking-over side extending perpendicularly to the plane of the needles immediately in front of the pile plates, the laying-in edge of the reed extending upwardly at an inclination to the needle-advancing direction, and the top edge of the reed extending at substantially right angles to the direction in which the fed pile threads not intended for patterning run.

4. Warp knitting machine as claimed in claim 2, wherein each pivotable plate is controllable against the force of a spring by a conventional jacquard mechanism.

5. Warp knitting machine as claimed in claim 4, wherein an intermediate store is provided for the items of pattern information delivered by the jacquard machine for each pattern stage.

6. Warp knitting machine, substantially as herein described with reference to and as shown in the accompanying drawing.