DE1260674B - Circular knitting machine - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

D04b

German class: 25 a-21

Number: 1260 674

File number: S 87880 VII a / 25 a

Filing date: October 15, 1963

Open date: February 8, 1968

The invention relates to a circular knitting machine with a tongue ring surrounding the needles, the is relatively rotatable with respect to the needle cylinder and has a gap for the thread feed.

When the needles are raised so high in a circular knitting machine that their pivotable Tongues release the previously formed meshes (containment position), so are generally protective devices arranged to prevent the tongues from accidentally closing and the needles when subsequent lowering cannot take up any yarn. For circular knitting machines for stockings the protection device usually in the form of a tongue ring, the one slightly larger Diameter than the circle of needles it encompasses. However, in this tongue ring for the Passage of the thread guide one or more gaps can be left on which to prevent of the closing of the tongues, movable members are usually attached to close these gaps ao are. Although these members offer increased protection, they not only require actuators, but can also cause serious damage to the thread guides and associated parts cause if they are not moved out of their active position at the right time. To theirs To avoid use, angled cam surfaces on the tongue ring were preferred attached to the side of the gap or gaps in it, acting as cams for opening Tongues are used that have been pivoted into a horizontal position, or those tongues that are higher have been swiveled, close to avoid damage. In the latter case, that calls Closing the tongues generally produces a drop of mesh, if not a subsequent one Tongue opener is used. This possibility of producing a defective product is still possible mechanical damage, even if this is preferable to just one needle.

The improper tongue needles are generally those used when knitting heels and tips are raised to an ineffective height in the reciprocating motion of the needle cylinder. Until now it was generally assumed that the incorrect position of the tongue causing the closing was caused by the a slight vertical movement or deviation of the needles is brought about by the centrifugal force their unprotected tongues is coupled.

On closer study of the misalignments, however, it appears that this is mainly due to the magnetization of the needles. It is circular knitting machine

Applicant:

Scott & Williams, Incorporated,

Laconia, Belknap, Hampshire (V. St. A.)

Representative:

Dipl.-Ing. W. Paap, Dipl.-Ing. H. Mitscherlich
and Dipl.-Ing. K. Gunschmann, patent attorneys,
8000 Munich 22, Steinsdorferstr. 10

Named as inventor:

John Joseph McDonough, Laconia, N. H.

(V. St. A.)

Claimed priority:
V. St. v. America November 2, 1962
(235 018)

knows that needles of a knitting machine are magnetized to a small extent. When the magnetization is very strong, it may happen that a tongue is essentially at right angles to it adjusts the needle shaft. In general, the needles are only weakly magnetized, which is but probably more disruptive. Here they will, especially if they are at a Circular knitting machine move outwards as a result of centrifugal force, attracted by the tongue ring and slide on its inner cylindrical surface even though they are open at this time. However, if they do once they touch the tongue ring, they remain in contact with it, and when they touch the tongue ring if they leave a gap, they tend to touch the lower cam surface of the tongue ring at the edge of the gap and are thereby raised. This lifting when leaving of the cam in the circumferential direction often results in them being pivoted high enough to pass through the top cam surface on the opposite side of the gap to be closed. This is probably due in particular to the fact that the needles move quickly and the tongues have less inertia when sliding onto the cam surface that they eventually leave, which it carries a little above the theoretical level.

809 507/120

3 4

The invention has the object that the invention applies to both circular knitting machines Magnetic sticking of the needle tongues on the tongue - with rotating needle cylinder as well as with such ring, in particular on both sides of the gap for with a standing needle cylinder and in particular for the thread feed, to prevent or to under- stocking circular knitting machines applicable where break. 5 the problem explained occurs in the first place, same-this According to the invention, the object is valid if such machines have one or more solves that the inner surface of the tongue ring work with a system. However, it is below on the example of a two-system round stocking cam formed by a recess in the tongue ring is provided through which explains the tongues of the machine with rotating needle cylinder, Needles can be moved into the open position. io which not only for circular knitting, but also These measures allow the tongues in when knitting heel and toe pockets in the the two-system in front of and behind each gap for the thread guide back and forth movement of the needle cylinder and will work. This is what the description deals with due to the rear ends acting as cams of the not with details of the operation of a sol-indentations moved inward so violently that it was essentially on the of the machine loosen the tongue ring before it limits the gap of those parts and assemblies that Reach tongue ring. When the magnetization, more or less directly to the subject of the consideration It is usually the case that it is weak, so finding is enough to include.

this separation of the tongues from that in FIG. 1 of the drawing is done in the usual way

Tongue ring, to be tightened again by the 20 rotating and moving back and forth

To prevent tongue ring, so that the tongues on the needle cylinder are designated with 2. It is grooved for

Gap for the thread feed in properly opened the arrangement of the needles 4 provided, which the

Pass position and hold the position for so long with the usual hooks 6 and those hinged at 10

keep that they have tongues 8 when passing the other and to control them in

At the end of the gap through the tongue ring in the open 25 known manner with feet 12 are provided. With the

position are held. Needles also work in a known manner

In order to reduce the harmful influence of the magnetization of the confinement plates 14,
The tongue ring 16 is proposed with the exception of the provisions for demagnetizing the tongues. Changes of the usual type have been made to the invention and, furthermore, one has already to cope with the operations during the opening 30 consists of several parts. It offers the needles to positively influence the tongues, magnetic on the inside of which is a cylindrical surface, tongue opener is used. However, both types of devices only interrupt the complex and costly 18 and 20 at the points of the thread guide bridges, at which the thread use of an energy source is required to enable the guide 22 and 24 to feed the threads to the desired location Achieve magnetic effect. This results in 35 needles arranged in the usual way. As seen further difficulties, since disruptive influences, several thread guides can be provided at each feed point, avoiding other moving machine parts, which must optionally be brought into consideration, which can often only be brought into the non-drive position by using. Magnetic materials can be reached in the tongue ring. In addition, gaps 26 and 28 are formed, which are used for insertion through these known devices in a considerable 40 and retraction of thread guides that are of the dimensions of the already small art in circular knitting machines that their active ends measured available space taken up. perform vertical movements,
No less expensive is a known pneumatic tool. It is a middle needle countersink 30 with two tongues that operate automatically for opening the surfaces 32 and 34 acting on the needle feet. All of these known devices are arranged 45, of which the surface 32, the tee-off part, has also only been proposed for double-cylinder circular knitting machines on the first system for circular knitting and in the front, the wärtshub without a tongue ring in pendulum knitting and the surface 34 that work and where the problem the elimination of the knock-off part for the second system at the reverse of the magnetic sticking of the needle tongues to the gangway. On the second system the tee tongue ring cannot occur. 50 part in circular knitting and the forward stroke in

The object of the invention differs from pendulum knitting by the surface 38 of a tee

from the known already basically formed in its part 36, while the tee 40 the

Task and has a very simple surface 42, which is used as a tee for the first

technical means feasible. Backward stroke system in pendulum knitting

The invention is shown below with reference to that shown in FIG. While lessening in the formation of the

Drawing shown as an example execution heel and toe pockets are the needles through

form described in more detail. In the drawing shows the minor fingers 46 and 48 raised, and for

Fig. 1 is a development of the needles fed back idle needles in their operating position

cooperating cams and other elements, if such pockets are expanded, an increase

viewed from the axis of rotation of a needle cylinder, 60 fingers 50. The dash-dotted lines A and B represent

F i g. 2 shows a plan view of a tongue ring, showing the needle paths when knitting heel and heel

measured the invention, point pockets in pendulum knitting, the

3, 4 and 5 are partial axial sections after the active needles along path A and the inactive needles

Lines 3-3, 4-4 and 5-5 of FIG. 1 and 2 and follow path B. As usual, lock parts 51 are

6 shows a corresponding section according to FIGS. 65 and 53 for lifting needles in groups

Line 6-6 of FIGS. 1 and 2, which, however, only indicates the out-of-service height of path B as well as to her

in the case of training of the previously usual type, return to the operating level in a non-group manner

shows the desired effects visually. the path A arranged.

The parts described so far and their arrangement and mode of operation are of the usual type, so that further details do not need to be explained. The invention is particularly concerned with the control of the tongues of those needles that follow path B at the inoperative level.

For the purpose of explanation, the usual designs of the in FIG. 1 and 2 shown tongue ring 16 described. In the direction of circular knitting according to the arrow drawn in FIG. 1 from right to left, the tongue ring 16 has an upper cam surface 52 and a lower cam surface 54 at the gap 26, which are inclined towards one another and meet in the radially extending edge 56. When the needles follow path B of the inoperative height, the tongue bearing 10 is at a height that is slightly below the edge 56. On the other side of the gap 26, the adjoining tongue ring section has a similar design and is provided with the cam surfaces 58 and 60 which meet in the edge 62. At the gap 28, the same tongue ring section is provided with the cam surfaces 64 and 66 which intersect in the edge 68, while the tongue ring on the left side of the gap 28 is provided with the tapering cam surfaces 70 and 72 which meet at the edge 74 cut. The aforementioned cam surfaces are all formed the same and their cutting edges 56, 62, 68 and 74 are all at the same level.

The usual mode of action resulting from these cam surfaces and edges is as follows:

Provided that a needle 4 following the inoperative path B is not magnetized and moves to the left through the lock in the direction indicated in FIG. If the tongue bearing 10 has too little friction, the tongue 8 comes into contact with the inner surface 76 as a result of the centrifugal force and is moved further with this contact. It then passes the cam surface 54 at a level below the edge 56 and can then pivot outwardly into a horizontal position as a result of the centrifugal force. Since it is also located below the edge 62 when passing through the gap 26, it is moved downward by the cam surface 60 into a likewise open position. The same processes are repeated at gap 28.

Here it can, always provided that the needle 4 is not magnetized, for various reasons, z. B. vibratory movements, it happens that a tongue 8 after entering the gap 26 over their horizontal position is also pivoted upwards, so that they the next section of the tongue ring reached with a height that is above the edge 62. In this case, the tongue 8 is through the Cam surface 58 is moved towards its closed position. This closed position of the tongue 8 can later through Opening can be corrected as a result of centrifugal force or as a result of shaking the needles; even if but the closed position at the time when the needles are put back into operation, should still exist, the result is only a poor workmanship of the goods, but none mechanical damage to the machine. The same processes take place on the other system and when moving back and forth in both directions.

The likelihood of incorrect movements of the tongue 8 is much greater when one The needle is magnetized. This is illustrated in FIG. 6 explained. If the magnetization, as usual, is weak and when the tongue 8 is not in contact with the inner surface 76 of the tongue ring 16 stands, so it is not likely that they of the

ίο tongue ring 16 is tightened because the tongue bearing 10 shows some "static" friction, even if it is weak. However, if the tongue 8 the Touches inner surface 76, it remains magnetically attached to it. When the tongue 8 on the cam surface 54 passes, it does not come out of contact with the tongue ring 16, because even a weak magnetic one Force that would not be great enough to bring about the first touch, now the touch maintains. Accordingly, as shown in FIG. 6, the tongue 8 is shown in contact with the cam surface 54 moves upwards and leaves this cam surface only at the edge 56 as a result of the circumferential movement of the needle 4. At the moment the cam surface 54 is left at the edge 56, however, the Tongue 8 swung vigorously upward as a result of the rapid circumferential movement of the needle 4, so that it when walking away from this edge is raised a little higher due to its own inertia. If you remains in this higher position, it reaches the tongue ring 16 on the other side of the gap 26 in a height slightly higher than edge 62 so that it engages cam surface 58, i. H. on the Intersection of this surface with the cylindrical inner surface 76 of the tongue ring portion slides.

It is therefore moved towards its closed position. It can then be in the fully closed position through the push are shaken so that their contact with the tongue ring 16 ceases. This results in a dropped stitch and a mistake in the goods.

From the above it follows that the likelihood of tongue closing is quite considerable is greater when the needle 4 is magnetized, during an erroneous operation based only on mechanical Causes is relatively unlikely.

The invention is therefore primarily directed to eliminating the possibility of incorrect operation to decrease due to magnetization of needles. It offers a relatively simple solution for this, which consists in that in the inner surface 76 of the tongue ring 16 on the opposite of the tongue 8 Place a recess 78 which ends in an outwardly directed cam 80 and the shape of which can best be seen from the dashed line in FIG. This cam rises in Inward direction preferably relatively quickly. Its mode of action arises in particular from Fig. 3, 4 and 5. F i g. 3 shows the state that exists when the magnetized needle 4 turns Well 78 is approaching. Here, the tongue 8 of the needle is in contact as a result of the magnetic force the cylindrical inner surface 76 of the tongue ring 16 held. When reaching the recess 78 remains magnetic attraction exist, so that the tongue 8 is in contact with the surface of the recess after is pivoted outside. When the tongue 8 reaches the cam 80 of the recess, it will follow moved down to their open position. Here can

the tongue 8 when the needle cylinder 2 moves very slowly, even after the action of the Cam 80 remain in contact with inner surface 76.

In normal operation, however, the needle 4 moves so quickly that the relatively abrupt one Action of the cam 80 of the tongue 8 transmitted a repulsive force, so that they of the Inner surface 76 of tongue ring 16 is thrown away, as shown in FIG. As already mentioned, the magnetization of needles 4 is relatively weak, so that the magnetic attraction, after the contact of the tongue 8 with the tongue ring 16 has only been canceled once is so small that it is hardly tightened to the tongue ring 16 again. Accordingly, the Tongue 8, after it has been flung away from the tongue ring 16, generally its open position maintained. Furthermore, the cam 80 of the recess 78 ends immediately in front of the lower part of the Cam surface 54, and since the tongue 8 is at least almost fully open, is a time element to that extent turned on when the tongue 8, before it could about bounce back outward again, on the cam surface 54 has passed so that it is not close enough to the tongue ring 16 to to be attracted to it again. Accordingly, the tongue 8, once it has been removed from the Tongue ring 16 is released, is not tightened again and retains its open position.

To produce the same effect on the other gap 28 and on both gaps when reversing, there are also recesses 82 and 88 arranged, of which the recess 82 has two cams 84 and 86, while the recess 88 is provided with the cam 90. The mode of action this recess is the same as that of the recess 78 and therefore does not need to be described again to become.

From the above description it follows that the usual tongue ring 16 is only in the simplest Way needs to be modified to cope with the difficulties that arise as a result of magnetization Needles revealed to eliminate.

Claims (1)

Claim: Circular knitting machine with a tongue ring that surrounds the needles and is opposite the needle cylinder is relatively rotatable and has a gap for the thread feed, characterized in that that the inner surface (76) of the tongue ring (16) is formed by a recess (78, 82, 88) of the tongue ring (16) Cam (80, 84, 86,90) is provided through which the tongues (8) of the needles (4) in the open position are movable. Considered publications:
U.S. Patent Nos. 2,966,784, 2,658,366, 1183 604;
Journal "Wirkerei-Strickerei-Technik", issue 6, 1954, pp. 20 to 26. 1 sheet of drawings 809 507/120 1.68 © Bundesdruckerei Berlin