DE2029698A1 - Thread insertion device for a warp knitting machine - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Weickmann,

Dipl.-Ing. H.Weickmann, Dipl.-Phys. Dr.K. Fincke Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, DEN

PO Box 860 820

MÖHLSTRASSE 22, NUMBER 48 39 21/22

J. P. STEVENS ■ & ■ CO., INC.

1460 Broadway

New York, New York, V. St. A.

Thread insertion device for a warp knitting machine

Warp knitting machines have been known for many years. With these machines, the knitting process is carried out with warp threads and bit insertion or weft threads carried out through knitting stitches the warp yarns inserted into the knitted fabric or enclosed in it will. The extremely high speed of knitting machines that js.B. 1200 runs per minute or one more perform a higher number of runs has regarding the mechanism brought with it hard working conditions for feeding the inlay yarn, namely the relatively high speed can result in undesirable or inconsistent tension. No problem arises when working with feeds in which the inlaid yarns occur Cut to length and put through suspension chains with the help of pins that release the thread as soon as it is inserted. One such machine is shown in U.S. Patent No. 3 364-701. This machine is extremely successful

_{AA Ä} BAD ORIGINAL

009.882 / U89

been employed richly; it can be operated at very high speeds. For this machine are however, additional elements are required, and furthermore is the yarn feed; very complicated.

A number of years ago has been proposed, such as by U.S. Patent No. 2,74-3,596 Feed in a single, uncut inlay twine. According to An earlier proposal used hooks that alternate curved inward and outward and around which a single end of the yarn was wrapped. These hooks were moved, which of course led to a zigzag shape of the inlay yarn until they reached the knitting line. At this The thread came loose from the hooks. The friction and tension involved made this mechanism simple however, only useful if a knitting machine was running at much slower speeds than it was running at was able to. The zigzag line from a single feed point became longer and longer with increasing tension, and it was found necessary to incline these hooks weakly so that the zigzag bit reaching the line of action wasn't that long. This measure helped a little, but caused the friction over the curved one Hook still existing tension that the machine is strong was operated at reduced speeds. The problem was thus not solved satisfactorily.

On the high-speed machine that has probably been used with the greatest success cut inlaid yarns move from a relatively large number of bobbins can be led away around a chain. This in the The form of the mechanism shown in U.S. Patent No. 3,364,701 enabled the use of different colored yarns in successive runs as well as high speed.

BATH ORIGfNAL 009882 / U89

Such machines ■ are generally among the most successful modern machines. These machines often occur However, a certain added complexity and one I'robleia on, namely in the event that the coils are fast moved and a bobbin has been used up that -arr- suf a new coil with the help of conventional Ubertra.nin-s- or Ubernan mechanisms not without further ado was effected. Because a large number of coils are used e.g. twelve or more reels, such a machine could still make a considerable number of revolutions without stopping. "

There is thus a need for a reliable and uniform one Feeding an uninterrupted end of an inlaid yarn from a stationary reel / being in conventional Can be canned over to a new bobbin if that The thread in the bobbin has been used up. This possibility the quick transition without stopping the machine is of real concern as one with extremely high speed working, very wide warp knitting machine yarn up to a speed of several kilometers per hour.

The present invention now relates to a yarn feed device which allows a continuous end of an inlaid yarn to be laid at high speed. The feed device according to the invention can also be attached to normal warp knitting machines or other machines where corresponding requirements exist, such as machines for feeding thread-reinforced paper. The invention has the advantage that it can be used in conjunction with normal warp knitting machines ¹ to make without causing any significant change in the respective mechanism · In this context, can be objected that

0098-82 / 1489 _ _BÄD

after the inlaid yarn has been delivered to the knitting line the effect of the present invention has ended and that the remainder of the knitting operation takes place in a normal, conventional manner. However, as explained in more detail below a variant of the present invention enables insert a twine; - only with every second cycle or every third revolution or after a plurality of revolutions, depending on where this type of Knitted fabric is desired.

An important feature of the invention is that dia pulling elements around which the single end of the thread is formed a zigzag line, lie on the outside of the respective chain when it passes through the line of action judged through it, and not on the inside, as it used to be was deemed necessary. The pulling elements provided on each chain are at equal intervals from each other spaced. However, the intervals do not necessarily need to be to be the same size on both chains. In the Cases that the chains are of different lengths and / or different Speeds, the intervals on both chains are not the same, although they are on each Chain are the same size. On the pulling elements there are also upper parts or covers that are shaped in a special way provided that have a shoulder and lift-off projection. This lift-off projection shows when the respective Ziehelemer.ts around the lower sprockets of the feed chains towards the knitting line and also allows that Inlay thread without a tension change :? from the relevant Pulling element held out.

Another important feature of the present invention represents a brake that acts on the pulling elements next to the lower sprockets can be brought into effect.

BATH ORIGINAL 00988 2 / U89

These pulling members rotate at a high speed machine working at relatively high speeds; although they are light, they own a sufficient power of inertia, according to which they themselves will continue to rotate when a machine is switched off. This can include thread entanglement and others Cause problems. Accordingly, in the present invention, a brake, such as a bracket with a soft rubber braking surface, applied to the outsides of the pulling elements in an appropriate or Distance, before this the respective lower drive chain sprocket of the reach the respective chain on which they are carried. The influence of the brake is not very great; however, it is enough off to slow down and stop the rotation of the pulling elements, almost instantly after switching off the machine. If a suitably strong inlay twine is used, so the brakes always stay in the working position, and their weak braking effect - weak here means; on the tension exerted on the inlay twine - also ensures even tension when the inlay twine is released.

When using slightly brittle inlay yarns and / or highly stretchable inlay yarns, such as with certain For yarns with spun »souls, the constant slowing down can be undesirable. In such a case / external facilities, such as magnetic relays, are provided, which interact with the machine release mechanisms in such a way that the Brakes are only applied when the machine is stopping and that there is no braking effect when the machine works at full speed. Such coupled braking force output devices are in a large number different machines for a variety of different purposes common, which is why these facilities are not here

009882/1489 _{0R (alNAL}

are shown in more detail, namely their exact training is not part of the 3rindunr. This is true for the more specific embodiment too, in which a detachable Brake is present. In some machines the preferred brakes can even be omitted, e.g. on smaller ones and slower working machines.

The above generally described operation of loading yarn feed; femäß the invention is suitable for the case that one inlaid yarn inlay takes place per machine cycle. The present Invention, however, has the advantageous possibility to provide an insert game only every second cycle or every third cycle, etc. In this version : This form of the present invention accepts retaining or retaining pins or hooks on the single game when it is is guided around the lower sprocket wheels of the two chains carrying the pulling elements. This restraint hook or pin is moved into or out of the holding position synchronously with the control of the knitting machine. The work or The movement ratio is determined by the fact whether an inlay yarn is to be inserted with every second revolution or less often. To lead out such retaining hooks from a point of contact with the yarn various Facilities are used, and considering further this variant of the invention can be noted It will be appreciated that the invention is not limited to any particular synchronous actuation. According to a more specific one Feature is a very simple stable and effective drive a reciprocating retaining hook or -pin that can be moved back and forth by elevations of cams, which are located on the lower sprockets. This means that no additional elements are required; the synchronism is always maintained. The operation is compulsory, which is why it is the preferred operation.

BATH ORIGINAL

009882 / U89

- 7 - 2G2.9698

If an egg is to be inserted with each cycle, the retaining hooks will of course not have any effect; Rather, they can be kept out of the working position when the machine is working in this way. This can also be effected by a circular "nooke", ie by a disc with a circular circumference attached to the lower sprocket wheels. Since it is very easy to swap crouches and to attach them to the chain tooth cutters in a certain position in relation to the pulling elements, this form of operation brings a number forward. Advantages with itself. It should be noted, however, that the U rf in dun_- is not restricted to this operating mode. It is also possible to provide a large number of squats on the lower sprockets, for example a loop, which is formed by a "circular disk which effectively holds a pin, or a loop which brings the restraint pin with springs into action for the second time, and a further lock which brings the restraint hook or pin into action with every third revolution Touching one or the other cam is vertically displaceable. Normally, two chains with an upper and a lower sprocket are preferably provided. In such a construction, cams are preferably provided that rotate with the sprocket shaft. On the underside, the chains can be guided around idler devices and other means may be provided for lifting the retaining hooks and contacting the yarn.

The invention is explained below with reference to drawings explained in more detail.

009882 / U89 BAD ORSGiNAL

Fin. 1 shows a top view of a Garnzuführvorrich-

FIG. 2 shows a left side view of the device shown in FIG. 1.

Fig. 5 shows a part in an enlarged section a drive chain, a pulling element with an upper part or cover from the device shown in FIG. 1. Fig. 4 shows a view of the elements shown in Fig. 3, viewed from the left or from the outside of the chain.

Fig. 5 shows schematically the lower sprockets as well part of the chain with pulling elements in different positions, around the one lower one Pulling element moving around the sprocket, with nine positions on the left gear and a small number of positions on the right sprocket is.

Fig. 6 shows a view of a line of action, namely below Illustrating "nine positions corresponding to the nine Positions of the left chain sprocket according to Fig. 5

In Fir. 1 and 2 are a plan view and a side view, respectively a device is shown with the aid of which a single end of an inlaid yarn is guided towards the knitting line. Only so much of the conventional warp knitting machine is shown as includes the part on which the inventive Mechanism is attached. In general, the rest of the warp knitting machine as a whole is not affected.

In Fig. 1, a three-coil transmission arrangement 1 is shown, from which an inlay thread comes from. The important advantage of the yarn feed can be exploited. At a machine operating at high speed, e.g.

BATH ORIGINAL 009882 / U8-9

Executes 1200 or more stitch formations per minute, Normal size spools last only five minutes, or an even shorter period of time for a large one Loom.

The yarn discharged from the supply bobbins 1 is passed through the eye 4 of an arm 3 swinging back and forth, which draws the inlaid yarn in a zigzag direction downwards to the line of action 11. The construction of the arm is best seen in Figure 2; Pig. However, Figure 1 shows the actual movement of the arm in the form of a curved double arrow. The back and forth movement of the arm, which takes place synchronously with the running of the knitting machine, is brought about by the knitting machine camshaft 21 via chains 22, 23 and a shaft 24 which drives a mechanism 25 that can be moved back and forth. Since this is of a normal design, it is only indicated schematically here, but not shown in detail. The yarn needle mechanism is shown as being on the top of a carrier 20. Parts of the _main carriers for the knitting machine are shown at 32 in FIG. It should be seen that the reciprocating motion of the arm 3 wraps the inlay yarn around pulling elements 8R and 8L & n of the right and left warps, respectively. The chains themselves are labeled 5B and 5L, respectively; they are driven by the upper sprockets 6L and 6R and carried by the lower chain sprockets JL and 7-R, respectively. In general, the same reference number is used for a number of elements which appear repeatedly on the two strings.

In the following, Figures 3 and 4 are considered in more detail, showing two different views of the dragging elements. As can be seen, these pulling elements are attached to the chains; they contain an actual pulling element 9 and "

009882 / U89 bad original

a shell or cover 10 that at one point runs in a defined direction at a slight angle to the respective chain. A head start or approach 33 lifts the respective thread out of the groove provided in the pulling element when the pulling element in question turns the lower sprocket rotates.

The two chains run around their chain gears with pretty much high speed, synchronized with the movement of the knitting machine drive. When the pulling elements 8 approach the lower sprockets 7, they will rotated at high speed, and although they are light, a significant mechanical moment is formed. Will If a machine is stopped, this can lead to the drawing elements concerned continuing to perform a spinning movement and pull out the inlay twine, which can then become tangled. It is therefore desirable to use the pulling elements in the To decelerate the shutdown and start-up of the machine, what is caused here by the brakes 12L and 12R. These Brakes are formed by brackets that have a soft rubber coated surface with which they the pulling element parts 9 touch.

If a fairly firm lay-in yarn is used, the brakes can always be in the braking position, as the additional amount of friction, which is large compared to the mechanical moment of a light rotating pulling element when the machine is stopped, in relation to the tension of the Inlay yarn is negligible. In addition to the braking when the machine is started up and shut down, however, the constant weak braking has a useful effect, since it ensures an even more even tension in the inlay yarn.

BATHROOM ORIGINAL 009882 / U89

If the strength of the yarn used allows it, can it be useful to apply the brakes even when working To keep the machine in braking contact. With certain Einlene threads, such as certain webbing souls that either easily brittle: · or are fairly stretchable or have both properties, is a constant braking undesirable. For this reason facilities can be provided that the brakes only work by starting and stopping the machine. Such Devices or mechanisms, such as magnet relays, which with commissioning sun and shutdown switches, "ekupDe.lt are of conventional design and are therefore here Not shown.

Fir. 2 also shows a chain in purely schematic form and trees 27- It should be seen that there. ": the chains at Approaching the line of action 11, as emerges from Fir 1, lying outside the chains. In the same figure are still Guide bars or Le eschiene drive devices 28, guides 29 and knitting needles 18 shown. As it is at these elements are conventional elements, which by the invention are not changed, they are both here and in Fi ^. 6 is only shown schematically.

In Fig. 5, there are eight positions of the lower sprockets illustrated for two drag elements. This represents a complete As the same processes are repeated on the right side, there are only four Positions shown in more detail. The retention hooks or pins 16L and 16R are shown schematically, namely only partially and only the respective end. As can be seen, weä-in position 1 according to FIG. 5 through the inlay yarn the lug 33 is raised and secured by the pin or tenon 18L detected by which the yarn is held in positions 2 to 4

0098 8 7 / U 8 9

-12- 2Ü29698

around

will. As the pulling element / lower sprocket rotates around the yarn tension is reduced, which is one of the advantages of the invention. In position 5, the yarn sliding from the cover 10 of the pulling element is introduced into the knitting line. The active elements and the diversion plate are indicated schematically on the left side by a rectangle. As can be seen, as the yarn is inserted into position 5 on the right-hand side by the retaining pin or tenon 16R, the next yarn zigzag loop is captured and held in the next four positions. In other words, this means that positions 5 to 8 on the right side correspond to c <Hl positions 1 to 4 * on the left side. In position 4 the retaining pin 16L is retracted which of course allows the yarn in position to slide off the cover 10L. In fact, the staggered operation of the pins 16L and 16R results in a single yarn being inserted only after every two revolutions. If a knitted fabric is desired in which a yarn is inserted with each revolution, the retaining pins 16L and 16R would be absent or would be continuously withdrawn. From 1 * 1-3. 1 o ^s t indicates that the operation; of the retaining pins 16L and 16R is carried out by the cam followers 15L and 15R. These cam followers run on squats 14L and 14-R, of which only squat 14-L is shown in FIG.

Fir. 6 shows the active elements in the same positions as in the left side of Fig. 5 · Here are only the first Warp guide and the knitting needle shown. The needle is shown purely schematically. In an actually executed machine, the needle is of course clamped, or a barbed needle is used if the machine is of this type. The needle 18 moves in its holder with a diversion plate 19 next to a stationary throat plate 31. The thickness of the inserted

BATH ORIGINAL 009882 / U89

2Ü29698

Yarn 2 is shown greatly exaggerated for the sake of clarity. In position 9 it is shown that £ - another inlaid Yarn comes into contact with a warp thread as in position 1. This creates a complete pattern of the knitted fabric produced with four complete knitting machine cycles. Each cycle is identified by the positions 1 - 2, - 3 - 4-j- etc. The knitted fabric will moved on between the revolutions, including the conventional Take-up roll 13 is used in Pig. 1 shown schematically is.

The stitch formation or the knitting process is carried out in a conventional manner. The board 171 »is in normal

TI Pt fifo

Moved wisely / inside and outside. This part of the machine will not changed in its entirety by the present invention; rather, the invention is limited to a feeding mechanism only directed for the inlay yarn.

The chains are shown in the form of a symmetrical prism, with chains of the same length being provided. the Chains move at the same speed. In this case, the spacing of the pulling elements is on each Chain the same size. If the chains are not arranged symmetrically, so the speed and the spacing of the pulling elements are not the same either. However, you must ever chain still be the same.

In the drawings, the machine is shown as running vertically. In this case the chains are in terms of that vertical and horizontal line shown inclined. However, this is not the only position in which the Machine can be arranged. In general it is only required that the inclination of the plane of the chains

BATH 009882 / U89

is chosen so that any knitting machine elements are avoided and that the deposit of the inserted yarn takes place in the line of action.

In the warp knitting machine shown, an interleave yarn is used fed. With other machines, such as those used for the production of reinforced paper or layered graphs, a thread-like element can be guided accordingly, which is not always technically a yarn. Hence, at times the more general term "thread-like element" is used, with which a yarn is seized, but also other appropriately shaped elements such as ribbons, threads and others fibrous fabrics. Even in the case that a real As a thread-like element referred to as yarn is supplied, the property of the yarn may vary. It can a spun or continuous thread, a plurality of threads or a single thread and the like. Act.

ORIGINAL BATHROOM

009882 / U89

Claims (13)

Claims Thread loading device; for a hurry. "et ten knitting machine, for training a thread element in a certain line, characterized by the use a) a thread element qua_JLle (1) b) of endless chains (5R ₁ 510 »which run from a point next to the thread element source (1) to the ends of the specific line (11), c) of pulling elements (ER, 8L) that are attached to the top of the ceweili-en endless chain (5R, 5L) are attached, from this to the outside and in uniform Intervals on the respective chain (5R »5I») are standing d) from 3 facilities (6R, 6L, 7H, 7L) to synchronous
Eewenrun: of the chains (5R, 51) in such a direction, that the outer areas of each chain (5R, 5L) move from the point next to the thread element source (1) to the specific line (11), e) of devices (33,9) for lifting the thread element (2) from the pulling elements (8R, 8L) when they are approaching .: to the specific line (11), and f) by devices that are synchronous with the Bewerrunr: the chains (5R, 5L) G ^e s "t ^e uert the thread element (2) around the pulling elements (8R, 8L) on the loops of the endless chains (5R, 5L) pull in such a way that the thread element (2) runs in a zigzag line from a point next to the thread element source (1) to the specific line (11). 2. Apparatus according to claim 1, characterized in that the devices for lifting off the thread element (2) from the pulling elements (8R, 8L) by lifting lugs on fastening devices of the pulling elements (8R, 8L) are formed. 009882/1489 _BAD 3. Apparatus according to claim 2, characterized in that each pulling element (8R, 8L) with a not rotating cap is provided on its upper side and that the respective lifting attachment the thread element (2) on the respective pulling element cap. 4-. Device according to one of claims 1 to 3, for Insertion of weft yarn along a knitting line using a yarn insertion device, characterized in that that an inlaid thread source (Ί) is provided and that two endless chains (5R, 5L) are provided which run from a point next to the inlaid yarn source (1) to the ends of the line of action (11) and so at an angle are to each other, -that knitting machine elements are avoided. 5. Apparatus according to claim 4-, characterized in that devices are provided which the two Chains (5R, 5I ») synchronized with the knitting machine drive in move in such a direction that the outer portions of each warp (5R, 5L) move away from a location adjacent to the source of inlaid yarn (1) Move towards the line of action (11) that the chain speed and the intervals of the pulling elements (8R, 8L) are chosen so that in the line of action (11) einreleges weft yarn (2) almost parallel to this Line (11) runs, and that devices are provided which are driven in synchronism with the knitting machine Pull the insert arn around the pulling elements (8R, 8L) on the outer loops of the two chains (5R, 5I *) in such a way that that the yarn (2) in a zigzag line from a point next to the inlaid yarn source (1) to the knitting line (11) lies down. BATH ORIGINAL 009882 / U89 6. Device according to claims 4- or 5 »characterized in that that the devices for lifting the inlay yarn (2) from the pulling elements (8R, 8L) shoulders (33) include on the pulling element fastenings that deal with Do not turn the pulling elements (8R, 8L). 7. Apparatus according to claim 6, characterized in that the pulling elements (8R, 8L) directly on their Top are provided with non-rotating caps that lie in a plane which is parallel, however slightly above the level of the chains (5R, 5I *) runs, and that the thread lifting lugs are arranged so., are that they pull the inlay yarn (2) at the line of action (11) approaching pulling elements (8R, 8L) on the caps raise. 8. Apparatus according to claim 7, characterized in that that movable retaining hooks or pins (16R, 16L) are provided adjacent the ends of the line of action (11) and that means are provided that allow these hooks or pins to move in such a way that the inlay yarn (2) is detected when a pulling element (8R, 8L) approaches an end of the line of action (11). 9. Apparatus according to claim 8, characterized in that that each chain (5R, 5L) around an upper and a lower Sprocket wheel (6R, 6L, 7R, 7L) is passed around, and that the means which cause the retaining hooks or pins (16R, 16L) to grasp the yarn (2), Include cam parts on the respective lower sprocket, which control the respective restraint hooks or pins (16R, 16L) via cam followers. 009882 / U89 -18- 2Ü29698 10. The device according to claim 9, characterized in that the rotation of the respective ui-teren I.ottenzahnrades (7R ₁ TL) and the respective nooks are synchronized such that the retaining hooks or pins (16R, 16L) the yarn (2) able to hold during at least one knitting run, the knitting machine being able to carry out a knitting process in the case of a pattern at least once without inlaid yarn. 11. Device according to one of claims 2 to 10, characterized characterized in that the device for guiding the inlay yarn (2) around the pulling elements (8R, 8L) has a Back and forth swinging arm includes, which is driven synchronously with the knitting machine at its ends an inlaid yarn guide owns. 12. The device according to claim 11, characterized in that braking devices (12R, 12L) are provided which the peripheral areas of the pulling elements (8R, 8L) in the outer Touch the loop area of the respective chain (5R, 5IO, when this approaches the line of action (11), and that facilities are provided, which cause the braking devices (12R, 12L) to engage the pulling elements (8R, 8L) to be applied in such a way that a weak braking force occurs at least during the stoppage periods of the knitting machine. 13. The device according to claim 13, characterized in that that the braking devices (12R, 12L) are movable brackets which are able to touch the circumferential areas of the pulling elements (8R, 8L) with resilient braking surfaces. Warp knitting machine characterized by the use of a thread insertion device according to one of the claims 1 to 13. BATHROOM ORIGINAL 009882 / U89 Lee r side