EP0234208A1 - Thread storage and delivery device, particularly for textile machines - Google Patents

Abstract

A thread storage and delivery device, in particular for textile machines, has a storage drum (4) in the manner of a rod cage with a number of elongate thread support elements arranged at equal radial distances from the drum axis (2) and distributed uniformly in the circumferential direction. Each of the thread support elements, which extends essentially in the drum axis direction at both ends on a drum body (13, 14, 15), is designed in the form of a narrow bracket (16) which on the thread supply side has a radially inward tapering, as a run-on slope for the incoming thread (8 ) acting area (17) and then an essentially straight area (19) forming a yarn support area for a plurality of turns of a yarn package (20), followed by a radially projecting, circular, continuous yarn outlet board (12). In order to avoid lint deposits etc., the thread outlet board (12) in the direction of the run-up bevels of the brackets is followed by a radially inwardly inclined peripheral surface (24) of a rotationally symmetrical cover (23) coaxial with the drum axis, which cover is at least in the area between adjacent ones Ironing (16) lying areas in the circumferential direction is continuous. The brackets (16) dip into the cover (23) essentially without a step. The peripheral surface (24) is continuously axially stripped off by the running thread (8) on the thread outlet side of the storage drum (4).

Description

The invention relates to a thread storage and delivery device, in particular for textile machines, with a storage drum in the manner of a rod cage, which has a number at equal radial distances from the drum axis and in the circumferential direction evenly: distributed elongated thread support elements, which essentially extend in both directions in the drum axis direction are attached to a drum body or parts connected to it, and each of which is designed in the form of a narrow bracket, which on the thread feed side has a radially inwardly tapering area which acts as a run-on slope for the incoming thread, and then a thread support area for several turns of one Has thread winding forming, at least in sections substantially straight area, followed by a radially projecting, circular, continuous thread outlet board of the drum body or a part connected thereto, the tapering n and the substantially straight areas of all brackets each lie on common rotational bodies intended to be coaxial with the drum axis, as well as with the storage drum on the thread feeding and removal indicator associated with thread feeding and removal elements and with a drive device for achieving a relative rotary movement between the storage drum and the Thread feeding and removal elements.

Thread delivery devices, the storage drum of which is generally designed to be rotatable on a holder in the manner of a rod cage, the thread support elements of which are formed by straight, cylindrical wires or thin rods at both ends in flange-like parts of one on the. Storage drum axis arranged drum body are fixed, are known in several embodiments (for example. DE-OS 31 04 516, DE-OS 27 23 210). The thread winding formed on the rods is given a polygonal shape corresponding to the number of rods, which is advantageous for good slip-free thread entrainment, while on the other hand the relatively narrow thread contact surfaces formed by the rods result in favorable conditions for the axial advancement of the storage winding. In order to effect this axial feed of the storage roll, separate feed devices must be provided, which are relatively expensive and complex.

Such feed devices dispense with a thread delivery device of the prior art (DE-OS 34 37 252) of this type, the storage drum of which is designed as a rod cage is provided with thread support elements in the form of a bow made of thin spring wire, both of which are attached to the drum body and of which each on the thread feed side has a radially inwardly tapering area, which acts as a run-on slope for the incoming thread and which is followed by an essentially straight area, which the Thread support area for several turns of the thread or storage roll forms. Due to the bevel of the start-up area, the turns of the incoming thread which are formed here are automatically axially displaced onto the thread support area under the effect of the thread tension, whereby a continuous advance of the storage roll is achieved.

The thread runs from the storage roll over the radially protruding, circular, continuous peripheral edge of the thread outlet eyelet. The arrangement is such that the thread outlet board is arranged in the manner of a circular disk on the drum body, the plane of symmetry of which is approximately at right angles to the thread support area of the thread support elements. In principle, this arrangement also applies to the storage drums of the thread delivery devices mentioned at the beginning.

When processing certain yarns, in particular low-quality polyamide or polyester yarns, torn-off individual filaments or other fiber parts can detach from the yarn and, in particular, wind around the bars or generally free-standing thread support elements in the thread run-off area. Also in the thread run-off area, clumps of such yarn or fiber parts can form between the rods or thread support elements, which accumulate with a longer operating time. Both appearances lead to the fact that the proper thread flow is finally hindered by the storage drum and there are disruptions in the thread delivery.

It is therefore an object of the invention to ' _remedy this _situation and to improve a thread delivery device of the type mentioned at the outset in such a way that even when processing such difficult-to-process yarns, for example of low-quality polyamide or polyester yarns, the risk of undesired accumulation of parts of the yarn that have been torn or detached from the yarn, for example torn continuous filaments, are prevented in the thread drain area of the storage drum.

To achieve this object, the thread storage and delivery device according to the invention is characterized in that on the thread outlet board in the direction of the bevels of the bracket to a radially inwardly inclined peripheral surface of a coaxial to the drum axis of rotation. Connects symmetrical cover, which is continuous in the circumferential direction at least in the areas lying between adjacent brackets and into which the brackets are immersed essentially without a step and that the peripheral surface on the thread run-off side of the storage drum is continuously axially stripped from the thread running from the thread support area to a thread discharge element is.

The circumferential surface of the cover, which is constantly stripped by the running thread, prevents Can permanently accumulate fiber in the drain area of the thread. Since the thread support elements immerse into this circumferential surface without a step, no blind spots can form in the vicinity of the thread support elements, in which undesired accumulations could grow.

Advantageously, the circumferential surface of the cover, starting from an area of large diameter in the vicinity of the drainage board, extends radially inward with an area of smaller diameter up to at least the middle of the substantially straight bracket parts. In addition, it is expedient if the circumferential surface adjoins the end of the outlet board without a step.

The circumferential surface of the cover which is continuous all around can have openings which receive the substantially straight bracket parts, so that the brackets are enclosed on all sides by the peripheral surface.

The peripheral surface of the cover can be substantially conical, but it has proven to be particularly advantageous if the peripheral surface has a concave curvature.

The cover can expediently consist of a material that is wear-resistant at least in areas of the peripheral surface, so that it also lasts for a long time Operating periods an impairment of the surface is excluded by the thread constantly streaking over it.

Particularly simple structural relationships result if the drum body has two coaxial circular flanges, to which the brackets are attached at the ends and of which the drainage rim is formed on one. The brackets are advantageously arranged free-standing between the flange adjacent to their run-in slope and at least in the region of the peripheral surface of the cover. This allows easy cleaning using a compressed air jet.

The brackets can also merge substantially tangentially into oblique surface parts of the adjacent flange in the region of their run-in bevel, the oblique surface parts also being able to be formed on rib-like parts of the corresponding flange or the drum body associated with the individual brackets, which are arranged essentially radially. The drum body itself is advantageously made of plastic.

In order to facilitate the axial advancement of the storage roll, the brackets can lie with their essentially straight areas on an imaginary cone, the diameter of which decreases towards the outlet board. It has proven to be advantageous in practice if the diameter taper the straight areas of the stirrups over their length is approximately 0.2-1 mm.

The brackets are expediently bent from wear-resistant wire, but in principle it is also conceivable to produce them from preferably wear-resistant coated plastic, in which case they can also be molded directly onto the drum body or formed as stamped or injection-molded molded parts etc.

In order to force the running thread to rest over the entire surface of the brackets and the peripheral surface cover, a thread drain ring can be loosely placed on the brackets in the area of the cover.

• Fig. 1 eine Fadenspeicher- und -liefervorrichtung gemäß der Erfindung, in einer Seitenansicht,
• Fig. 2 die Speichertrommel der Fadenspeicher- und -liefervorrichtung nach Fig. 1, in einer Seitenansicht und in einem anderen Maßstag,
• Fig. 3 die Speichertrommel nach Fig. 2, geschnitten längs der Linie III-III der Fig. 2, in einer Draufsicht und in einer Teildarstellung, und
• Fig. 4 eine Einzelheit der Speichertrommel nach Fig. 2 im Ausschnitt, in einer Teildarstellung und in einer Seitenansicht.

In the drawing, an embodiment of the object of the invention is shown. Show it:

• 1 is a thread storage and delivery device according to the invention, in a side view,
• 2 shows the storage drum of the thread storage and delivery device according to FIG. 1, in a side view and in another dimension day,
• Fig. 3, the storage drum of FIG. 2, cut along the line III-III of FIG. 2, in a plan view and in a partial view, and
• Fig. 4 shows a detail of the storage drum of FIG. 2 in a detail, in a partial view and in a side view.

The thread storage and delivery device shown in FIG. 1 has a holder 1 which is set up for fastening to a frame ring of a circular knitting machine and on which a storage drum 4 is rotatably mounted by means of an axis 2 (FIG. 3), which as a drive device has one on the axis 2 rotatably attached pulley 5 is assigned, which can be set in rotation by a drive belt, not shown.

On the holder 1 are as thread feeders. a thread inlet eyelet 6 and a thread inlet eye 7 are arranged, through which a thread 8 coming from a spool (not shown) is fed to the storage drum 4 via a thread brake 9 also provided on the holder 1. An inlet sensor 10 scans the thread running towards the storage drum 4 and, if the thread breaks, stops the machine. The thread 8 running from the storage drum 4 runs through an outlet eyelet forming the thread removal device, which is fastened to the holder 1 and is located laterally next to the storage drum 4 and at a predetermined distance below its outlet board 12, so that the tangent from the storage drum 4 Thread is guided diagonally downwards and radially outwards; it is sensed by an outlet sensor 120.

• Die im wesentlichen aus Kunststoffmaterial hergestellte Speichertrommel weist einen etwa scheibenförmigen kreisrunden oberen Flansch 13 und einen den durchgehenden Ablaufbord 12 bildenden, ebenfalls kreisrunden unteren Flansch 14 auf, die koaxial zueinander im Abstand angeordnet und über ein koaxiales Nabenteil 15 miteinander verbunden sind. Nach Art eines Stabkäfigs sind eine Anzahl in gleichen radialen Abständen von der Trommelachse 2 angeordneter und in Umfangsrichtung gleichmäßig verteilter länglicher Fadenauflageelemente vorgesehen, die durch im wesentlichen L-förmige Bügel 16 gebildet sind, welche aus gehärteten zylindrischen Stahldraht mit polierter Oberfläche gebogen sind. Die Bügel 16 sind mit ihren Enden in den beiden Flanschen 13,14 verankert. Sie weisen auf der Fadenzufuhrseite_' (in Fig. 2 oben) jeweils einen radial nach einwärts sich verjüngenden Bereich 17 auf, der eine Anlaufschräge für den zulaufenden Faden 8 bildet, an die sich über einen Radius 18 ein im wesentlichen gerader Bereich 19 anschließt, der als Fadenauflagebereich für mehrere Windungen eines bei 20 angedeuteten Faden- oder Speicherwickels dient. Der Radius 18 zwischen der Anlaufschräge und dem Fadenauflagebereich kann in der Größenordnung von ca. dem Einfachen bis Vierfachen des Drahtdurchmessers der Bügel 16 liegen. Sowohl die sich verjüngenden Bereiche 17 als auch die dem Radius 18 zugeordneten Bereiche 19 aller Bügel 16 liegen auf jeweils einem gemeinsamen zu der Trommelachse 2 koaxialen gedachten Rotationskörper.

The structure of the storage drum 4 can be seen in particular from FIGS. 2, 3:

• The essentially made of plastic material The storage drum has an approximately disk-shaped circular upper flange 13 and a circular lower flange 14 which forms the continuous outlet flange 12 and is also arranged coaxially at a distance from one another and connected to one another via a coaxial hub part 15. In the manner of a rod cage, a number of elongate thread support elements arranged at equal radial distances from the drum axis 2 and evenly distributed in the circumferential direction are provided, which are formed by essentially L-shaped brackets 16 which are bent from hardened cylindrical steel wire with a polished surface. The ends of the stirrups 16 are anchored in the two flanges 13, 14. They each have a radially inwardly tapering region 17 on the thread feed side _' (in FIG. 2 above), which forms a run-on slope for the incoming thread 8, to which a substantially straight region 19 adjoins via a radius 18, which serves as a thread support area for several turns of a thread or storage roll indicated at 20. The radius 18 between the run-on slope and the thread support area can be of the order of magnitude of approximately one to four times the wire diameter of the stirrups 16. Both the tapered regions 17 and the regions 19 of all brackets 16 assigned to the radius 18 each lie on a common rotational body that is coaxial to the drum axis 2.

The imaginary rotational body assigned to the straight region 19 is a cone with a slight incline, the diameter of which decreases towards the outlet rim 12. The narrowing of the diameter in the straight regions 19 is approximately 0.2-1 mm over their length.

In the area of their run-up slope at 17, the stirrups 16 essentially transition tangentially into inclined surface parts 21 of the adjacent flange 13, which are formed on rib-like parts 22 of the flange 13, which are arranged essentially radially. Alternatively, an uninterrupted, i.e. closed inclined surface 21 may be provided.

A cover 23 made of metal or a plastic provided with a wear-resistant surface is placed on the lower flange 14 and can optionally also be formed in one piece with the flange 14. The cover 23, which is designed in the form of a rotary body coaxial with the drum axis 2, has a circumferential surface 24 which is inclined radially inward in the direction of the run-up bevels 17 of the brackets 16 and into which the bracket areas 16 with their straight regions are essentially without a step, ie with a smooth transition , immerse. For this purpose, in the continuous circumferential surface 24 of the cover 23 only the substantially straight bracket areas 19 receiving openings 25 are provided, the edge of which closely adjoins the bracket areas 19.

The peripheral surface 24 connects in the (lower) areas of largest diameter to the circular outlet board 12 and then extends radially inwards with a concave curvature, with its area of smallest diameter at least up to the middle of the substantially straight bracket areas, in In the present case, however, it extends to behind the radially inner side of the essentially straight bracket regions 19.

Deviating from the illustrated embodiment, the peripheral surface 24 could also be a conical surface. Then the width of the storage roll 20 must be dimensioned such that the running thread 8 separates from the storage roll 20 only very deeply.

Finally, on the cover 23 a bracket 16 with play enclosing thread drain ring 27 is loosely placed in such a way that the running thread 8 runs between the thread drain ring 27 and the peripheral surface 24 of the cover 23 or the outlet board 12.

The incoming thread 8 coming from the inlet eyelet 6 runs approximately at 28 in FIG. 2 onto the inwardly inclined parts 17 of the stirrups 16 which form the run-up slope and begins to form the storage roll 20 in the region of the radius 18. The incoming thread 8 is supported at the top on the parts of the brackets 16 bent outwards in the radius 18 and on the run-up slope and thus continuously pushes the storage roll 20 axially downward. This advance of the storage roll 20 is facilitated by the fact that the substantially straight thread support areas 19 of the stirrups 16 lie on an imaginary cone which slightly tapered towards the outlet board 12, as has already been explained.

The thread 8 running from the storage reel 20 to the outlet eyelet 11 and from there to the knitting point progressively sweeps from left to right from top to bottom in the region of the storage drum 4 shown in FIG. 2, the straight regions 19 of the stirrups lying under the storage reel 20 16 and the areas of the circumferential surface 24 of the cover 23 lying between and below the openings 25. This results in a continuous wiping or wiping of both the stirrups 16 forming the thread support elements and the circumferential surface 24 in an essentially axial direction, as shown again in FIG. 4 is illustrated schematically. This effectively prevents the accumulation of thread or fiber particles carried by the thread 8, and also prevents loosened filaments from being able to loop around the stirrups 16 in the thread outlet area. Since the stirrup areas 19 plunge softly and continuously into the peripheral surface 24 via the closely fitting openings 25, blind spots are avoided, which cannot be covered by the thread 8 and could therefore lead to the accumulation of fibers.

The one placed on the cover 23, for example Plastic material existing thread outlet ring 27 forces the thread 8 passing through it to rest over the entire surface on the bracket regions 19 and on the peripheral surface 24 of the cover 23.

In the illustrated embodiment, the peripheral surface 24 is continuous all around, only the openings 25 allowing the passage of the bracket areas 19. Alternatively, it would also be conceivable to divide the inclined circumferential surface 24 only over surface areas between the bracket areas 19, the brackets 16 then possibly in the vicinity of the flange 12, i.e. subsequently to the essentially straight regions 19, similarly to 17, could be bent obliquely outwards, so that a substantially C-shaped shape of the bracket results.

As can be seen from FIG. 2, the stirrups 16 are free-standing starting with their region 17 until they are immersed in the openings 25. arranged, which is achieved by a correspondingly small diameter of the hub part 15. Embodiments are conceivable in which the brackets are embedded, for example, at half their diameter in the plastic material of the drum body or of the hub part 15.

The brackets 15 can also be molded parts, stamped from sheet steel or injection molded from plastic material, etc., as is also conceivable to use profiled wires that have a cross-sectional shape that deviates from the circular cross-sectional shape for this purpose.

Claims (17)

1. Thread storage and delivery device, in particular for textile machines, with a storage drum in the manner of a rod cage, which has a number of elongated thread support elements arranged at equal radial distances from the drum axis and distributed uniformly in the circumferential direction, which runs essentially both ends in the drum axis direction a drum body or parts connected thereto and each of which is designed in the form of a narrow bracket which on the thread feed side has a radially inwardly tapering area which acts as a run-on slope for the incoming thread and then a thread support area for several turns of a thread winding Forming, at least in sections substantially straight area, followed by a radially projecting, circular, continuous thread outlet board of the drum body or a part connected thereto, the tapering and the substantially straight areas of all brackets lie on common imaginary rotating bodies coaxial to the drum axis, as well as with the storage drum on the thread feeding and removal side associated thread feeding and removal elements and with a drive device for achieving a relative rotational movement between the storage drum and the thread feeding and removal elements, characterized in that the thread outlet board (12) in the direction of the run-up bevels (17) of the bracket (16) to a radially inwardly inclined peripheral surface (24) of a coaxial to the drum axis (2), rotationally symmetrical Ab cover (23) connects, which is continuous at least in the areas lying between adjacent brackets (16) in the circumferential direction and into which the bulbs (16) are immersed essentially without a step, and that the circumferential surface (24) on the thread outlet side of the storage drum (4 ) of the thread (8) running from the thread support area (19) and going to a thread removal element (11) can be continuously axially stripped off. 2. Apparatus according to claim 1, characterized in that the circumferential surface (24) of the cover (23), starting from a region near the discharge board (12) lying large area, with an area (26) of smaller diameter radially inwards to extends at least to the middle of the substantially straight bracket regions (19). 3. Apparatus according to claim 1 or 2, characterized in that the peripheral surface (24) of the cover adjoins one end without a paragraph directly to the drain board (12). 4. Device according to one of the preceding claims, characterized in that the continuous circumferential surface (24) of the cover (23) has the substantially straight bracket areas (19) receiving openings (25). 5. Device according to one of the preceding claims, characterized in that the peripheral surface (24) of the cover (23) is substantially conical. 6. Device according to one of claims 1 to 4, characterized in that the peripheral surface (24) of the cover (23) has a concave curvature. 7. Device according to one of the preceding claims, characterized in that the cover (23) consists of a wear-resistant material at least in the region of the peripheral surface (24). 8. Device according to one of the preceding claims, characterized in that the drum body has two coaxial, circular flanges (13, 14) to which the brackets (16) are fastened at the ends and of which the drainage rim (12) is formed on one . 9. The device according to claim 8, characterized in that the bracket (16) between the their bevel (16) adjacent flange (13) and _/ at least in the region of the peripheral surface (24), the cover (23) are arranged free-standing. 10. The device according to claim 8 or 9, characterized in that the bracket (16) in the region of their run-up slope (17) essentially tangentially into oblique surface parts (21) of the adjacent flange (13). 11. The device according to claim 10, characterized in that the inclined surface parts (21) on the individual brackets (16) associated rib-like parts (22) of the corresponding flange (13) or the drum body are formed, which are arranged substantially radially. 12. Device according to one of the preceding claims, characterized in that the drum body consists of plastic. 13. Device according to one of the preceding claims, characterized in that the brackets (16) lie with their substantially straight regions (19) on an imaginary cone, the diameter of which decreases towards the outlet board (12). 14. The apparatus according to claim 13, characterized in that the diameter tapering of the straight regions (19) of the bracket (16) over their length is approximately 0.2 to 1 mm. 15. Device according to one of the preceding claims, characterized in that the brackets (16) are bent from wear-resistant wire. 16. Device according to one of claims 1-14, _' characterized in that the brackets are punched or injection molded parts. 17. Device according to one of the preceding claims, characterized in that on the cover (23) a bracket (16) enclosing thread drain ring (27) is loosely placed.

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