US3523431A - Raschel machine - Google Patents

Description

Ag. 11, 1970 w H, SCHE.BE 3523,431

RASCHEL MACHINE Fi1ed Aug. 18. 1966 INVENTOR.

WALTER HUGO SCHEIBE Int. C1. Ii04b 23/00 U.S. Cl. 66-86 3 Claims ABSTRACT OF THE DISCLOSURE In a Raschel machine for blind stitching, a row of needles. Bach of the needles includes needle hook points and downwardly turned latches having tips. The latches are cf a predetermined length, and as seen from the back side of the needles, front guide bars and rear guide =bars are coordinated to the row of the needles. The front guide bars place threads which lie on the side of the latches below the tips of the needle latches and form blind stitchings, while the rear guide bars pass warp tbreads and produce the ground, which warp threads lie above the tips of the needle latches and below the needle hook points, prior to the downward movement of the needles, so that the guide bars alone perform the blind stitchings and the loops without the use of a fall plate.

The present invention relates to a Raschel knitting machine.

The invention of the Raschel knitting machine brought to the textile industry an appreciable progress due to the non-exhaustible design possibilities of the goods produced thereon. It was, however, an outspoken slow rnnner. The field of goods, produced economically only With a high number of revolutions, rernained closed to it for many years. A decisive change was brought about by the invention disclosed in the former patent of the present inventor, namely Pat. N0. 2744,398, dated May 8, 1956.

By the arrangement of the stitch comb, which, in the normal Raschel knitting machine, works from the back side of the needle into the row of needles, on the needle latch side, in accordance With the mentioned prior patent, and by the replacement of the abutment wire to stop premature closing of the needle latches, which is freely tensioned in the normal Raschel over the entire machine Width, by means of tongue abutments provided on the stitch comb to prevent the premature closing of the needle latches, it was made possible to develop the Raschel machine to a fast runner, which now also conquered the field of the production of fine single-needle tulles and curtains and to displace completely the bobinet machine, which controlled, up to then, this field, since this new Raschel machine makes possible not only the multiple Working speed of the bobinet machine, but also uninterrupted lengths of goods of about 1500 m., while in the bobinet machine, depending upon the yarn thickness, the empty bobbins had to =be replaced by new ones after abont 30 to 50 m. and the new threads had to be knotted to the old ones, before the WOIk could be continued. Nevertheless, the field of the so-called fall plate fabrics remained closed to the fast running Raschel machine. In connection With these fabrics, from one part of the guide bars weft threads are inserted over one or a plnrality of needles, as so-called efiect threads, or as blind stitchings, such that the threads, as the warp threads, are wound around the needles, however in the opposite rotary direction and, yet pressed down by means of a fall plate below the tips of the downwardly turned needle latches, so that they slide during the downward rnovement of the needles over the needle latches, closing the needle hooks and are United States Patent O Ece bound only by one of the two legs of the warp thread loops, while the normal weit threads placed behind the back of the upwardly moving needles are bound by both legs of the warp thread loops. The movement of the fall plate, which extends over an appreciable rotary angle of the machine, does not permit an increase of the number of revolutions of the Raschel machine.

lt is one object of the present invention to provide a Raschel knitting machine which permits provision of a fast running Raschel Machine for the production of socalled fall plate fabrics without the use of a fall plate.

It is another object of the present invention to provide a Raschel knitting machine wherein for the performing of blind stitchings, the needle latches of the row of neodles causing the blind stitchings is kept so short that, seen from the rear side of the needle, the threads of the blind stitchings placed by the front guide bars are disposed all below the tips of the downwardly turned neodle latches, While the warp threads forming the base and placed by the rear guide bars, are disposed above the tips of the downwardly turned needle latches and below the needle hook point at the beginning of the downward movement of the needles, and by this arrangement, the provision of a fall plate is avoided, which prevents an increase of the number of revolutions. In case of a Raschel machine With stitch comb, the latter is disposed, in a known manner, on the needle latch side and is equipped With abutments to stop prernature closing of the needle latches. Thus With the now machine, so-called fall plate fabrics can be produced in a most economical manner With a high machine speed.

With these and other objects in view which will become apparent in the following detailed description, disclosing the present invention by example only, the present invention will be clearly understood in connection With the accompanying drawing, in which:

FIG. 1 is a schematic elevation of a Raschel knitting machine With a fall plate in the uppermost position of the needle upon termination of the stitching of the threads, to indicate the status 0f the prior art;

FIG. 2 is a schematic elevation of the Raschel knitting machine disclosed in FIG. 1 after an at least part downward rnovernent of the needle again With a fall plate, to indicate likewise the status of the prior art;

FIG. 3 is a schematic elevation of a Raschel knitting machine designed in accordance With the present invention indicating the omission of a fall plate without emitting the function of a previously used fall plate, in the uppermost position of the needle; and

FIG. 4 is a schematic elevation of the Raschel machine disclosed in FIG. 3, indicating the position after an at least part downward movernent of the needle.

Referring now to the drawing, and in particular to FIGS. 1 and 2, a needle bar 1 carries needles 20 which are guided in a trick plate 3, disclosing a known Raschel machine having a single bar 1 With means for forming blind stitchings. FIG. l is a schematic section indicating the upperrnost position of the needle bar 1 and including a fall plate 12. Front guide bars 4, seen from the rear of the needles, perform the blind stitchings. Rear guide bars 5 perform the stitchings leading to the loop formation.

Referring now again to the drawing, FIG. 2 indicates a position arrived at shortly after the osition shown in FIG. 1 upon slight downward movement of the needle 20.

During the time period between the positions disclosed in FIGS. 1 and 2, the fall plate 12 has moved downwardly and has pushed down the thread 7 of the blind stitching along the needle tongue 60, so that upon fnrther downward movement of the needle 20 the thread 7 assumes a position below the needle tongue 60 and cannot enter the needle hook 110.

Referring now again to the drawing, and in particular to FIGS. 3 and 4 an embodiment of a Raschel machine having a single bar incorporating the present invention is disclosed.

The parts of FIGS. 3 and 4 corresponding to those in FIG. 1 have the sarne numerals. FIG. 3 indicates the machine, similar to the showing in FIG. 1 in the uppermost position of the needle bar. The latches 6 of the needles 2 are so short, that the threads 7 Wund about the needles 2 by the front guide bars surround the needles 2 below the needle latches 6, which is made possible, in accordance With the present invention, by shortening the length of the needle latches 6 from the 1ength a (FIG l), to the length a (FIG. 3). Accordingly the distance of the pivot point of the latches 6 from the upper edge of the needle hook 11 is shorter than the corresponding distance from the needle hook 110 in FIGS. 1 and 2.

FIG. 4 shows the machine in a position, corresponding to FIG. 2 of the prior art structure, shortly after the position of the needle bar shown in FIG. 3. It is apparent from FIGS. 3 and 4, that no fall plate 12 is required, in order to bring the thread 7 of the blind stitchings below the needle latch 6, so that they slide during downward movement of the needles along the needle latches 6 and the needle hooks 11.

The threads 8 of the rear guide bars surround, however, the needles 2 above the needle latches 6 and slide during downward movernent of the needles 2 into the needle hooks 11, by which they are pulled through the loop 9 of the finished goods 10 disposed on the needles 2, in order to forrn a new loop.The threads 7 are not pulled through the loop 9, rather are bound by one leg of the loops formed by the threads 8. During the upward rnovement of the needles 2, the goods 10 are kept down by means of a stitch cornb (not shown, as arranged in accordance with U.S. Pat. N0. 2,477398), disposed on the side of the needle latch 6 and equipped With abutments t0 stop premature closing of the needle latches 6.

The machine, designed in accordance with the present invention, does not only permit a high number of revolutions during the production 0f normal fall plate fabrics, rather also fall plate fabrics With so-called double laying. With a double laying of the effect threads, the hiding of the cheap cotton filling material threads used for the base 0f the fabrics has been obtained already. If, now, instead of the non-elastic cotton threads, elastic threads of synthetic bers are used, fall plate fabrics with socalled double laying can be manufactured on the machine, designed in accordance with the present invention, with great economy, by performing, Within the range of the upper needle dead center, a first laying with the guide bars causing blind stitchings, while the other guide bars are displaced behind the back of the needles beyond one or more needles, and thereafter, a second laying with all guide bars is perforrned. In this manner, it is possible as it has been shown, to produce fabrics of extremely high elasticity, since the threads of the blind stitchings, which are laid only around one of the legs of the 100p forming threads, are elastically anchored. Such goods are elastically expandable to at least the double Width.

By the machine, designed in accordance with the pres ent invention, it is also possible, to produce an open and great looped fabric, which can be used as insert in paper 0r synthetic foils for reinforcernent of, for instance, cement bags.

If, in a Raschel machine having two needle bars, only one needle bar is used, in accordance With the present invention, for performing the blind stitchings, on such machine double bar fabric can be produced, which comprises a single-needle elastic knitting prodced on the needle bar equipped for forming blind stitchings and a ground knitting produced on the other needle bar of synthetic monofil-thread to which the elastic knitting is attached at sorne p0ints. Such goods permit a plastic deforrnation of the ground knitting, which serves as stabilizing knitting for instance, in brassieres and bathing suits for the elastic knitting, which is not loosened from the ground knitting during washing and wringing, as it is the case with coinins.

I claim:

1. In a Raschel machine for blind stitching,

a row of needles,

each of said needles including hook points and downwardly turned latches having tips,

front guide bars and rear guide bars coordinated to said row of needles,

said fr0nt guide bars placing threads for forming blind stitchings,

said real guide bars being adapted to pass warp threads for producing loops, and

said needle latches being shorter than conventional latches of conventional needles, so that prior to the downward movement of said needles said threads placed by said front guide bars e;ngago said needles below said tips and and form blind stitchings, while said threads passed by said rear guide bars 1ie above said tips but below said needle hook points and form normal stitchings producing loops, so that said guide bars alone perform the blind stitchings and the loops without the use of a fall plate.

2. The Raschel machine, as set forth in claim l, which includes a stitch cornb dispose'd on the sid of said needle latches and equipped with an abutment to stop premature closing of said needle latches.

3. The Raschel machine comprising two needle bars, one of said needle bars being equipped as set forth in claim 1 for perforrning said blind stitchings.

References Cited UNITED STATES PATENTS 2,092701 9/1937 Ingalls 66121 XR 2396489 3/1946 Brooksby et a1. 66-121 XR 3063274 11/1962 Kohl 66-121 XR 2,744398 5/1936 Schieb 6686 RONALD FELDBAUM, Primary Examiner

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