EP1256646A1 - Circular knitting machine - Google Patents

Abstract

A circular knitting machine for producing circular knitwear (15) is described, which is slit at one side, spread out with the aid of V-rolls (17) and then taken down and wound up in the spread out state. In accordance with the invention a guide element (44) if fitted at one end (33) of a fabric spreader (25) and extends up to a junction point (43) of the V-rolls (17). The knitwear (15) is guided by means of the guide element (44) in a controlled manner before running on to the V-rolls (17), such that backing-up and warping during its further transport are avoided.

Description

The invention relates to a circular knitting machine in the preamble of claim 1 specified genus.

On conventional circular knitting machines, a tubular one is usually used first Knitwear produced, which then folded into a double-layer web, in this Form fed to a take-off and / or winding device and finally to a Take-up roller is wound up or otherwise deposited. To achieve that tubular goods free of distortion and wrinkles from the take-off and / or take-up device is detected and transported, is between the trigger and a spreader is usually arranged in the means producing the knitwear. This comes to lie inside the tubular fabric and is shaped so that the essentially Knitwear produced in a cylindrical shape on two diametrically opposite Pages drawn wide in the radial direction and thereby in the essentially flat, double-layered web is transferred before it is in the effective range of Take-off and / or take-up device arrives. A disadvantage is that the two long sides of the double-layered web of longitudinal folds or folded edges arise, especially when processing fine, elastic yarns permanently be embossed into the fabric and also through targeted measures in the equipment cannot be eliminated.

Circular knitting machines of the type described at the outset are therefore already known that serve the purpose, not the one coming out of the machine, closed Tubular goods, but one cut open on its long side and then onto the pulling off and winding up the double-width spread fabric (DE-T2-069 121 291, US-A-5 566 558, WO-A-00/506 78). In such a case, deduction and if necessary also winding rollers are provided, which are about twice as long as their usual length have, and the machine diameter must be much larger in this case fail than is common practice. An advantage of this type of machine is in it seen that the two arise when winding a tubular knitted fabric Buckled edges are eliminated.

Experiments with such circular knitting machines have shown, however, that the cut one and spread knitwear when it comes out of the machine in one intolerable extent is warped and wrinkled. More detailed investigations indicate curved rows of stitches in a central area of the goods as the cause of these faults. The curvature of the rows of stitches could in turn do so be due to the fact that the knitted fabric in the area of the spreading device having the V-rolls at a non-uniform speed when viewed across its width transported and the take-off and / or winding device is fed so that a Distortion and wrinkle-free deduction is not possible.

The technical problem underlying the invention is therefore also in Circular knitting machines of the type described at the outset are free from warpage and wrinkles To allow deduction and thus the production of a perfect knitwear.

The characteristic features of claim 1 serve to solve this problem.

The invention has the advantage that the faults observed so far in spread material can be largely avoided. This is attributed to the fact that the knitwear also in the between the spreader and the junction of the V-roller area is performed and z. B. at a radial distance can be held by the machine axis, which is essentially that of the spreader manufactured radial distance corresponds. This will remove the fabric after leaving the Breithalters up to where it runs onto the junction of the V-rollers, on undesirable radial movements prevented and without formation of jams on the V-rollers transferred.

Further advantageous features of the invention emerge from the subclaims.

Fig. 1 eine schematische, perspektivische Darstellung einer Rundstrickmaschine zur Herstellung einer aufgeschnittenen und ausgebreiteten Stickware;

Fig. 2 eine Draufsicht auf die Rundstrickmaschine nach Fig. 1;

Fig. 3 eine Seitenansicht der Rundstrickmaschine in Richtung eines Pfeils x in Fig. 2;

Fig. 4 in vergrößertem Maßstab einen Breithalter und eine Ausbreiteinrichtung der Rundstrickmaschine nach Fig. 1 bis 3;

Fig. 5 eine Draufsicht allein auf den Breithalter nach Fig. 4; und

Fig. 6 eine vergrößerte, perspektivische Darstellung einer Einzelheit Y in Fig. 4.

The invention is explained in more detail below in connection with the accompanying drawings using an exemplary embodiment. Show it:

Figure 1 is a schematic, perspective view of a circular knitting machine for producing a cut and spread embroidery.

FIG. 2 shows a top view of the circular knitting machine according to FIG. 1;

3 shows a side view of the circular knitting machine in the direction of an arrow x in FIG. 2;

4 shows, on an enlarged scale, a spreader and a spreading device of the circular knitting machine according to FIGS. 1 to 3;

Fig. 5 is a plan view of the spreader of Fig. 4 alone; and

FIG. 6 shows an enlarged, perspective illustration of a detail Y in FIG. 4.

1 to 3, a circular knitting machine contains a frame 1, which in the embodiment three spaced at angular intervals of approx. 120 °, radially from the machine externally projecting feet 2 to 4, wherein the foot 2 is a main foot and each of the Feet 3 and 4 is a side foot. The main foot 2 does not serve to accommodate one shown drive motor and other electrical or electronic assemblies as well as controls for the circular knitting machine, while the side feet 3, 4 to on an existing switch unit are free of such units.

The frame 1 also has an upper support ring 5, in which a cylinder support ring 6 is rotatably mounted, on which a needle carrier 7, only schematically indicated, is in shape a needle cylinder is attached, which together with the cylinder support ring 6 by one The central or machine axis 8 of the circular knitting machine is rotatably mounted in the frame 1.

The support ring 5 serves u. a. to accommodate a conventional, the needle carrier 7 surrounding Castle shell, of which only one segment 5a is shown for the sake of simplicity. In addition, the frame 1 has a lower support ring 9, which with the help of auxiliary feet 10 can be parked on the floor. The lower support ring 9 is used for rotating Storage of a turntable 11 on which a frame 12 is attached, the one in general carries the take-off and / or take-up device designated by the reference number 14, by means of which a knitted fabric 15 produced by the needle carrier 7 and indicated in FIG. 3 can be drawn off and wound up. In principle, it does not matter whether the Knitwear 15 only pulled off the take-off and / or take-up device 14, only is wound up and / or drawn off and wound up, as is generally known to the person skilled in the art is known.

In the exemplary embodiment, the frame 12 contains two fixed or in an upper section rotatably mounted deflection rods 16, in a section immediately below two fixed or rotatably mounted, preferably substantially horizontal and V-shaped arranged V-rollers 17 intended for spreading the knitted fabric, below of these and in a central part of the frame 1 two or more, synchronized with the V-rollers 17 rotatable and rotating take-off rollers 18 and in a lower section finally a loosely rotatably mounted winding roller 19 in the frame 12, at least a drive roller 20, which bears against its circumference, is associated with the roller during operation the circular knitting machine knitted fabric 15 supplied by the take-off rollers 18 in known Way on the take-up roller 19. Finally, the circular knitting machine a cutting device 21 mounted in the frame 1 and provided with a rotatable knife on, which serves the purpose of knitting fabric 15 coming from needle carrier 7 after or if necessary, also before passing the deflecting rods 16 along a side line cut open. The cutting device 21 is preferably displaceable on a rod 21a, to allow adaptation to different fabric widths. The V-rollers 17 can either stand still or rotate and if necessary with the help of a separate rotary drive, e.g. B. a drive shaft, regardless of the take-off rollers 18th be driven.

When the circular knitting machine is in operation, the knitted fabric coming from the needle carrier 7 15 spread out along the cutting line by means of the V-rollers 17 until they have a single-layer, in forms a substantially flat path, and then with the help of a rotatably mounted in the frame 1 Deflection roller 22 (FIGS. 2 and 3) the take-off rollers 18 and from there the take-up roller 19 fed. It is then wound up by this with a width twice that Width of the one produced with the needle carrier 7 and normally on opposite Side edges folded, two-layer tubular goods corresponds. It does not matter whether the needle carrier 7 and with it the entire take-off and winding device 14 With the help of the drive housed in the main foot 2 rotates about the central axis 8 or whether both remain at a standstill and the lock casing is rotated instead becomes.

If a circular knitting machine with a rotatable needle carrier 7 is provided, then it is preferred at least one driver 23 is provided on the underside of the cylinder support ring 6, which is used for synchronous rotation of the frame 12 with the cylinder support ring 6 and in a coupling receptacle 24 is attached.

As is particularly indicated in FIG. 3, within one of the means 5a, 7 generated tubular section 15a of the knitted fabric 15 a spreader 25 is arranged. This serves the purpose of section 15a in a double-layer, flat web 15b to convert the spreading device containing the V-rollers 17 in this form is fed.

Circular knitting machines of this type are generally known and therefore need a person skilled in the art not explained in more detail (DE-T2-691 21 291, US-A-5 566 558, WO-A-00/506 78). The same applies to numerous possible embodiments of a spreader and its arrangement in the circular knitting machine (e.g. DE-A-21 30 660, DE-A-24 43 067, DE-A-31 12 181, DE-A-199 09 207), which is why all these documents hereby to avoid of repetitions by reference to them on the subject of the present Revelation to be made.

The shape of the spreader 25 used according to the invention results in particular from 4 and 5. The spreader 25 contains two parallel and arranged in an upper plane, comparatively long rods 26 and 27, at the ends of each one obliquely downwards extending, comparatively short rod 28 to 31 is attached. Bars 28, 29 5 and 30, 31 also run toward one another in pairs in a triangular shape and are connected in pairs at their free ends in such a way that the connection points each form a first and second lateral end 32, 33, which in a lower, for upper level parallel level of the spreader 25 is located. The length of the spreader 25 significant distance of the ends 32, 33 is therefore compared to that perpendicular to it measured distance of the upper rods corresponding to the width of the spreader 25 26, 27 comparatively large.

The two ends 32, 33 are further connected to one another by a rod 34. The Rod 34 is like the rods 26, 27 preferably made of z. B. three telescopic mutually displaceable and fixable relative to each other by means of adjusting screws 35 Sections. Therefore, the length of the spreader 25 can be solved by loosening the set screws 35, moving the sections and then tightening the set screws again 35 can be changed. In addition, a pivot bearing 36, e.g. in the form of a sleeve, arranged by means of connecting arms 37 on the rods 26, 27 and optionally 34 is attached and for rotatably receiving a holding rod 38 serves. This can, in a manner known per se, coaxial to the machine axis 8 (FIG. 3) be attached to a stationary part of the circular knitting machine, e.g. B. at a central, the needle bar 7 protruding center rod, which on a on the support ring 5th supported, arranged above the needle carrier 7 wreath. This is the spreader 25 is rotatably mounted on the holding rod 38. Also preferred are Means, not shown, are available, by means of which the height of the spreader 25 is adjustable.

The rods end at the left end 32 of the spreader 25 in FIGS. 4 and 5 30, 31 preferably in front of an imaginary triangle tip. They are at their free ends connected in this case by a crosspiece 39 forming the end 32, the in a middle part via a radially inward and downward angle piece 40 the rod 34 is attached. This creates a cutout 41 at the first end 32 into which the cutting device 21 also indicated in FIGS. 2 and 3 at least partially protrude can. Alternatively, the end 32 could be formed exactly like the end 33 and the Cutting device 21 can be arranged completely under the spreader 25. Moreover the knife of the cutting device could also protrude between the rods 30, 31.

In FIG. 4, the relative position of the reference to FIG. 1 is also shown in an enlarged view to 3 described deflecting rods 16 and V-rollers 17 can be seen, whose axes in essentially lie in planes that go to the upper and lower planes of the spreader 25 are arranged in parallel. As a result, the spreader 25 in the area of the upper Bars 26, 27 supplied tubular section 15a of the knitted fabric 15 through the Spreader 25 stretched in the direction of the lateral ends 32, 33 and at the same time transversely to it contracted so that it is laid flat when leaving the spreader 25 and a Material web 15b forms, which are connected to one another by two longitudinal longitudinal folds Layers. This material web 15b is then, as described, through a narrow, out between the deflection rods 16 formed by the cutting device 21st Continuously cut on a lateral longitudinal fold and with the help of the V-rollers 17 spread. The deflecting rods 16 are fixedly or rotatably mounted in bearings 42.

So that the knitted fabric 15 in the area between the second end 33 and one Junction 43 of the two V-rollers 17 is constantly controlled, is in this A guide element 44 is arranged according to the invention. The guide member 44 is z. B. a rod, especially a round rod, and with one end at the bottom of the second end 33 of the spreader 25 attached. The guide element protrudes from this 44 preferably essentially parallel to the machine axis 8 (FIG. 3) downwards, its outer radial distance from the machine axis 8 preferably to close the connection 43 approach substantially the same as the radial distance of the Outside surface of the end 33 of the machine axis 8 is. At the connection point 43, the guide element 44 is bent radially inward along a section 44a or curved and extends to the junction 43, so that one radially outside lying guide surface of the guide element 44 there a soft, heel-free Transition area to the beginning of the V-rollers 17 creates. It is in principle regardless of whether the two deflecting rods 16 are additionally present or not. are the deflecting rods 16, which is expedient, then the guide element 44th at least so thin that it protrude through the gap between the deflecting rods can, as Fig. 4 shows.

The connection point 43 between the V-rollers 17 is according to a preferred embodiment the invention formed by a head piece 45 (Fig. 6). This owns a radially inner side facing the machine axis 8 two lugs 46, which can each hold one end of an associated V-roller 17. The V-rollers 17 can be rotated and / or swiveled and / or with not shown as required Fixing screws can be fixed non-rotatably on the lugs 46. On a radial on the outside, the head piece 45 also preferably has a receptacle 47 for the associated, radially inwardly bent end 44a of the guide element 44. This provides the additional advantage that the guide element 44 as a driver is formed, the one about the machine axis 8 rotary movement of the entire Spreading device, what when using a circular knitting machine with a rotatable Needle cylinder is required to transmit to the spreader 25, so that this does not go through the knitwear 15 itself or by an additional connecting element around the holding rod 38 needs to be rotated.

6 is preferably at the free end of a stable rod or Pipe member 48 attached to a radially opposite part of the frame 12 is attached, as Fig. 1 indicates. The rod or have a particular advantage Pipe element 48 and the head 45 associated and engageable, z. B. in the manner of a hinge assemblable fasteners around a substantially horizontally arranged axis are pivotable relative to each other and which is assigned a 49 pinch screw. It is then possible, after loosening the Clamping screw 49 the swivel angle of the planes spanned by the V-rollers 17 relative to the rod or tube element 48 depending on the respective requirements adjust and then tighten the clamping screw again. It is possible furthermore, the V-rollers 17 can be pivoted in a corresponding manner by means of the lugs 46 to store that the angle they enclosed is changeable. Finally The V-rollers can also be rotated and / or rotated in other ways depending on the needs be pivotally arranged.

A particularly important advantage of the guide element 44 is that it can be made comparatively thin. Good results are e.g. B. with a achieved a maximum of 9 mm thick round rod, the bent end 44a of a length of 77 mm. But also z. B. diameter of the guide element 44 from 2 mm to 40 mm are usable. Because of this construction, it is possible that trained as a knee Headpiece 45 transverse to the gap between the deflecting rods 16 even then comparatively train broadly if this gap is chosen very narrow. Such as B. Fig. 4 shows According to the invention, the flattened fabric is not by the head piece 45, but spread apart by the thinner guide element 44 and only then on the V-rollers 17 transferred. This avoids the risk that the spreader 25 and possibly the deflecting rods 16 tightly folded knitwear 15 abruptly on the wide head 45 or any other to bring the V-rollers together 17 used construction must accrue and thus possibly on one uniform under the influence of the take-off and / or take-up device 14 forward movement is prevented. The thinner or narrower the guide element 44, the more uniform the spreading process would have to be. this applies in particular if, according to FIG. 6, the one hanging down from the spreader 25 straight section of the guide element 44 is arranged radially essentially at one point is an imaginary intersection of the two central axes of the V-rolls 17th corresponds, and therefore from there to the connection point 43 or to the head piece 45 there is still a sufficiently large radial distance. The folded knitwear 15 can then be gradually spread along a longer distance without undesired Traffic jams or other changes in speed when the knitted goods come up 15 to the connection point 43.

The invention is not restricted to the exemplary embodiment described, which is based on can be modified in numerous ways. This applies in particular to training and Arrangement of the guide element 44. This can, for. B. be formed as a rod of only on its radially outer side a preferably round or oval Has fabric guide surface. It would also be possible for the guide element 44 not to be exact the maximum width of the knitted fabric 15 caused by the spreader 25 or its end 33 up to the vicinity of junction 43. These include in particular Arrangements expedient, the adjustment of the guide element 44 in the radial and / or axial direction and thus in each case the production of a position of the guide element 44 enable that depending on the individual case as the convenient location is felt. It is also clear that the guide element 44 is made of one material should be produced, that compared to that used to manufacture the knitted fabric 15 Yarn ensures the best possible friction. Furthermore, the Invention does not apply to the described size specifications for the guide element 44 limited, which are only to be regarded as examples. The needle carrier 7 could instead of Needle cylinder can also be designed as a dial or in addition to the needle cylinder also include a dial. Finally, it is understood that the different characteristics also used in combinations other than those shown and described can be.

Claims (11)

Circular knitting machine with means (5a, 7) for producing a circular knitted fabric (15), a spreader (25) arranged below the means (5a, 7) and having a first and a second lateral end (32, 33), a take-off and / or take-up device (14) and a spreading device arranged between the spreader (25) and the take-off and / or take-up device (14), the V-rollers (17) connected in a V-shape to one another at a connection point (43) and a cutting device assigned to them (21) in such a way that a tubular section (15a) of the circular knitted fabric (15) is laid flat by the spreader (25), cut along a first longitudinal fold formed by its first end (32) with the cutting device (21), along one by the second end (33) of the spreader (25) formed second longitudinal fold is spread out by means of the V-rollers (17) and is pulled off in the expanded state from the take-off and / or take-up device (14), d characterized in that between the second end (33) and the connection point (43) there is arranged a guide element (44) intended for transferring an area of the knitted fabric (15) containing the second longitudinal fold to the V-rollers (17). Circular knitting machine according to claim 1, characterized in that the guide element (44) contains a rod. Circular knitting machine according to claim 2, characterized in that the rod is provided with a round or oval fabric guiding surface. Circular knitting machine according to one of Claims 1 to 3, characterized in that the guide element (44) is fastened to the second end (33) of the spreader (25) and is arranged essentially parallel to it and at a radial distance from a machine axis (8) which corresponds to the radial distance of the second end (33) from the machine axis (8). Circular knitting machine according to one of claims 1 to 4, characterized in that the guide element (44) for forming a step-free transition runs approximately at the level of the connection point (43) along a radially inwardly curved arc (44a) to the connection point (43). Circular knitting machine according to one of claims 1 to 5, characterized in that the guide element (44) is designed as a driver which transmits rotary movements of the V-rolls (17) about a machine axis (8) to the spreader (25). Circular knitting machine according to one of claims 1 to 6, characterized in that the connection point (43) is formed by a head piece (45) which, on a radially inner side, has two lugs (46) intended for receiving ends of the V-rolls (17) ) having. Circular knitting machine according to claim 7, characterized in that the V-rollers (17) are rotatably and / or pivotably mounted in the head piece (45). Circular knitting machine according to claim 8, characterized in that the head piece (45) is provided on a radially outer side with a receptacle (47) for an associated end of the guide element (44). Circular knitting machine according to one of claims 1 to 9, characterized in that two deflecting rods (16) forming a passage gap for the knitted fabric (15) are arranged between the spreader (25) and the V-rolls (17) and the guide element (44) Passage gap protrudes. Circular knitting machine according to one of claims 1 to 10, characterized in that the first end (32) of the spreader (25) contains a cutout (41) into which the cutting device (21) projects.

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