EP1125877A1 - Winding head and its use - Google Patents

Abstract

The winder head, to wind a yarn on to a bobbin (7), has a bobbin drive (2,3) and a yarn layer with a reciprocating lever (5) on a pivot axis (10) to lay the yarn along the length of the bobbin. The bobbin drive has a friction roller (3) with a roller drive (2). The yarn laying lever (5) has a separate drive (4). Both drives (2,4) are linked to a common winding head control (6). The friction roller (3) and the yarn laying unit are combined into a winding head module, mounted to a common carrier (1), which also has the winding head control (6). The winding head is fitted to the textile machine by a simple mounting e.g. a bayonet fitting. The pivot axis (10) for the yarn laying lever (5) is within a dust-proof housing, which contains at least a part of the drive for the yarn laying lever (5). The yarn laying lever drive has a unit (13) fitted to the pivot axis (10), working with a motor drive (14), with a reduction between them. The drive unit on the axis (10) is an angle segment (13), and the motor drive is a toothed pinion (14) acting on a toothed belt of the axis drive (13) within the dust-proof housing. The friction roller (3) is fitted directly to its drive (2), within the interior of the friction roller (3). A sensor registers the passage of the yarn laying lever (5) through the center of the stroke movement path. The sensor is a transmitter at the angle segment, and a detector fixed at the center of the stroke movement path. A sensor registers the rotary speed of the friction roller (3), and a sensor monitors the rotary speed of the bobbin (7). Each winding head or winding head module is linked by a bus (16) to a bi-directional interface (17) to a control.

Description

The present invention relates to a winding head for winding a thread on a bobbin, with a bobbin drive and with a thread laying with one mounted on an axis of rotation Oscillating drivable lever for laying the thread in the longitudinal direction of the bobbin.

Many of today's winding machines are still designed as so-called slitting machines, where a large number of winding units each have a central drive for thread laying and has the coil drive. This rigid coupling of the winding units with each other prevents the individual realization of winding laws depending on the diameter, such as for example precision or step precision winding at the individual winding units.

This rigid coupling can be achieved through the use of separate drives for thread laying and Coil drive of each individual winding unit are broken open. So far, however, such systems either because of their lack of flexibility or because of the cost. For example Systems known in which the thread laying lever is driven by a gear, e.g. Cam discs, reverse screw shafts or the like is driven, on the one hand, relatively are expensive and where the laws of motion only involve mechanical intervention in the Gear can be changed.

In the case of thread laying described in EP-A-0 838 422, the thread laying lever is mounted directly on the axis of the drive motor and can therefore be easily connected to the various Wrapping laws are adjusted. However, this requires the use of relatively expensive encoders for the necessary resolution of the step size, what for machines with many production sites is not economically viable. The recent development shows very clearly that the The costs of the individual winding unit are the main factor that determines which type of thread laying is used.

By the invention, a winding head of the type mentioned is now to be specified with which the application of any winding laws possible and which can be produced at low cost is. In addition, coil travel and coil geometry should be freely selectable, at least within limits his. After all, the winding head should also work properly in a harsh textile environment.

The object is achieved according to the invention in that the coil drive a distribution roller is formed, and that the distribution roller and the thread laying lever each have a separate one Have drive, both of which are connected to a common winding head control are.

A first preferred embodiment of the winding head according to the invention is characterized in that that the friction roller and the thread laying structurally to form a winding head module are summarized and mounted on a common support on which the Coil head control is arranged.

The invention is therefore based on the new approach that only a noticeable cost reduction can be achieved if you use both thread laying and bobbin drives starts. The separate drives for thread laying and distribution roller enable one maximum flexibility of the winding head and the realization of the winding head as a module are reduced not only the costs but also facilitates installation, operation and maintenance. The coil drive with the friction roller is compared to a direct drive of the coil, especially at deeper ones Winding speeds more cost-effective. In addition, the inertia ratio of the friction roller from drive to coil significantly lower than with direct drive, so that drives are smaller Power can be used.

A second preferred embodiment of the winding head according to the invention is characterized in that that the axis of rotation carrying the thread laying lever is dust-proof inside a Completed housing is guided, which at least parts of the drive of the thread laying lever contains.

It is created in many areas of textile production, especially when winding staple fibers a more or less strong fiber flight, which is particularly evident in linear thread guide systems in the guides of the thread guides. The latter can lead to disturbances, which require frequent cleaning cycles, which increases the productivity of the machine in question sinks. This is especially the case with large machines with many individual positions and / or extremely undesirable in systems with many machines. The installation of at least parts of the Drive in a dustproof housing makes the winding head extremely immune to dust.

A third preferred embodiment of the winding head according to the invention is characterized in that that the drive of the thread laying lever is a drive element fixed on the axis of rotation and motor-driven drive means therefor, the drive member and the drive means are designed so that between the motor and the axis of rotation there is a reduction.

A fourth preferred embodiment is characterized in that the drive member by an angular segment and the drive means are formed by a tooth sweater, which the Drives angle segment.

The invention further relates to the use of said winding head and said Spooling head module on open-end spinning machines, such as rotor spinning machines. there is preferably each winding head or each winding head module via a bus to a directional Interface connected to a host computer.

In the following, the invention will be explained in more detail using an exemplary embodiment and the drawing explained, the drawing being a schematic view of a winding head module according to the invention from the front, looking perpendicular to the coil axis.

As shown, the winding head module consists of an angled carrier 1 on which essentially a drive 2 for a friction roller 3, a drive 4 for a thread laying lever 5 and a winding head controller 6 are arranged. The winding head control 6 is connected to a not shown Power supply connected. This winding head module forms a compact unit, on the intended textile machine, for example a winding or an open-end spinning machine can be easily assembled. The carrier 1 can be designed such that it in addition to its function as a carrier for the individual parts of the winding head module, additional functions, such as cooling.

The friction roller 3 is provided for the non-positive drive of a coil 7, which to this Purpose rests on the jacket of the friction roller 3. The friction roller drive 2 is preferably so trained that his motor integrated into the hollow body of the distribution roller 3 and the distribution roller is fixed on the motor shaft, resulting in a very compact length of the friction roller drive system + Friction roller leads. In addition, for the friction roller 3 because of its fixation on the motor shaft no own storage required, which leads to cost savings. On Another advantage of this design is that the friction roller 3 because of the free accessibility of the winding head module from one side, as shown on the right, simply to assemble. The motor of the friction roller drive 2 is preferably a stepper motor.

Basically, a motor-driven one can be used to drive the coil 7 instead of the friction roller 3 Spindle are used, on which the coil is attached. Such a direct drive is advantageous at high and very high winding speeds, whereas at lower ones Winding speeds, such as are the rule on rotor spinning machines, for example Advantages of the roller drive predominate. These advantages are mainly deeper Cost and in that the inertia ratio of the drive to the spool in the friction roller is significantly smaller than with direct drive, so that motors with lower power are used can be. Another advantage results from the use of a stepper motor for the friction roller drive because the stepper motor compared to a brushless asynchronous motor has a significantly higher torque at lower speeds.

A speed sensor 8 or 9 is assigned to the friction roller drive 2 and the coil 7. Both speed sensors 8 and 9 are connected to the winding head control 6 and deliver the current speed data, from which, among other things, the thread length and the Coil diameter can be calculated. The latter is especially for the realization of from Coil laws depending on the coil diameter (wild winding, precision winding, step precision winding) required.

The thread laying lever 5 sits on an axis of rotation 10 and points at it from the axis of rotation 10 distal end of a thread guide slot 11. The thread to be wound (not shown) runs from a supply spool or from a manufacturing or machining process via an arc plate 12 forming a control curve, which is indicated in the drawing by its contour is through the thread guide slot 11 to the bobbin 7. The mutual position of the thread laying lever 5 and arch plate 12 and the length of the thread guide slot are chosen so that the thread during the movement of the thread laying lever 5 the bottom of the thread guide slot 11 not touched. This ensures that the thread path from the arch plate 12 up to the coil 7 always the same, regardless of the diameter of the coil, Has geometry. Instead of the curved plate 12, a straight guide rail can also be used become.

The thread laying lever 5 performs an oscillating, back and forth movement during operation and moves according to the laws of thread winding within a swivel angle of about 30 ° to 60 °. The axis of rotation carrying the thread laying lever 5 10 is led into the interior of a dust-tightly closed housing (not shown), in which sits on the axis of rotation a toothed angle segment 13, which over a tooth sweater 14 of the laying drive 4 is driven. The motor of the laying drive 4 is preferred formed by a stepper motor. Regarding the dust-tight sealed housing refer to European patent application No. 99 107 229.9.

The angle segment 13 and the tooth pullover 14 had different diameters, so that there is a reduction ratio between i = 2 and i = 20 between the tooth pullover 14 mounted on the motor axis and the angle segment 13. As a result, the moments of inertia, which are largely caused by the thread laying lever 5, only act on the motor shaft by a factor of 1 / i ² and an inexpensive drive motor with relatively low power can be used. At the same time, when using a stepping motor for the laying drive 4, the incremental movement of the thread laying lever 5 improves by the reduction factor i.

Reference number 15 denotes a mechanical stop for the thread laying lever 5, which serves as a reference point for the position of the thread laying lever 5. This reference point defines the starting position of the thread laying lever 5, relative to that for the Each stroke required steps of the motor of the laying drive formed by a stepper motor 4 can be defined. Referencing must be carried out each time the Spool head module are made, as well whenever the laying unit is de-energized or the stepper motor has lost its position.

As an option, the winding head module can pass through the thread laying lever 5 the stroke-detecting sensor are supplemented (see EP-A-0 453 622) by the length of the Monitor hubs from the center of the stroke to the reversal points and correct any errors To allow errors in the lifting movement. This sensor can, for example, by a arranged on the angular segment 13 and a magnetic transducer assigned to it stationary scanner be formed. When using a stepper motor, however, it is one Monitoring not required, because at most steps can be lost, the programmed one Hub would not be fully reached. If such errors are not corrected the system can be operated in open loop mode. That means that System as an inexpensive controller and not as a much more expensive feedback control system is executed.

This is one reason for the possibility of being able to operate the system in open loop mode the described reduction of the moment of inertia acting on the motor shaft. Because this Reduction has the consequence that the thread laying is mechanically very robust, so that in Usually the programmed stroke lengths are also adhered to and no deviations occur. It is only recommended for units for higher and highest speeds that System to be implemented as a feedback control system. In this case, it is advantageous on the Motor shaft of the motor of the drive 4 to provide an angle sensor based on the angular position the motor shaft to determine the stroke position of the thread laying lever 5 and in the event of deviations readjust the motor accordingly between the actual and setpoint. For even higher ones Speeds can save energy to affect deceleration and acceleration of the thread laying lever 5 can be provided in its reversal of movement. In terms of Energy storage of this type is referred to EP-A-0 838 422.

The angle segment 13 can be designed as a gear segment and with the tooth puller 14 in direct intervention. For reasons of wear and damping, however, it is advantageous that Angle segment 13 not to interlock, but to equip with a toothed belt that with the tooth sweater 14 is engaged. The toothed belt is preferably not endless but as Belt piece formed, the ends of which are attached to the angle segment 13. With very few Double strokes of the thread laying lever 5 per minute, which is the case with parallel winders, for example if this is the case, a directly toothed angle segment 13 can also be used.

The speed of the stepping motor of the laying drive 4 is determined by the winding head controller 6 changed over the stroke in such a way that a constant thread speed parallel to the axis the bobbin 7 also results when the thread laying lever 5 with its with the thread guide slot 11 provided end describes a circular path. The geometry of the arch plate 12 can be chosen so that at a constant speed of the thread laying drive 4 a constant Speed of the thread parallel to the bobbin axis results.

The laying drive 4 can also be arranged outside the dustproof housing. To For this purpose, the shaft of the toothpull 14 would pierce a housing wall, the Passage opening would be sealed with an O-ring. The arrangement of the laying drive 4 outside the housing has the advantage that the engine heat is better dissipated can.

The control electronics can also be arranged outside the housing, with the sensor for the passage of the thread laying lever 5 through the center of the stroke through the housing wall works what when choosing a suitable sensor, such as a Hall effect sensor, and a plastic housing is not a problem.

If the winding head modules in large numbers on the same machine, for example one Open-end spinning machines are used, they are via a bus 16 to a bus control 17 connected, which is the interface between the winding head controls 6 and one Master computer forms. The bus control 17 has a terminal 18 for input and output of data on.

• Alle bekannten Wickelgesetze, wie wilde Wicklung mit Bildverhütung, Präzisionswicklung und Stufenpräzisionswicklung.
• Eine höhere Spulendichte infolge von Präzisionswicklung (geschlossenes Windungsverhältnis) oder Stufenpräzisionswicklung (geschlossenes Windungsverhältnis).
• Eine konstantere Spulendichte für Färbespulen durch Präzisionswicklung (offenes Windungsverhältnis) oder Stufenpräzisionswicklung (offenes Windungsverhältnis).
• Einen in Grenzen frei wählbaren Spulenhub, insbesondere frei wählbare Spulenhöhe, Hubvariation (Reduzierung der Spulenkantenhärte), Hubverkürzung (Reduzierung von Fallfäden), Hubverlegung (Reduzierung der Spulenkantenhärte).
• Eine frei wählbare Spulengeometrie (zylindrische Spulen, konische Spulen, bikonische Spulen).
• Bildung einer Fadenreservewicklung.
• Freie Positionierung einer Endwulstwicklung innerhalb der Spule.
• Exakte Fadenlängenmessung.
• Kompensation der Schlepplänge.

The use of the described winding head module with the electronically controlled thread laying together with the distribution roller, whereby the thread placement and distribution roller are individually driven, enables among other things:

• All known winding laws, such as wild winding with image prevention, precision winding and step precision winding.
• A higher coil density due to precision winding (closed turns ratio) or step precision winding (closed turns ratio).
• A more constant bobbin density for dyeing bobbins through precision winding (open turns ratio) or step precision winding (open turns ratio).
• A freely selectable spool stroke within limits, in particular freely selectable spool height, stroke variation (reduction of spool edge hardness), stroke shortening (reduction of falling threads), stroke relocation (reduction of spool edge hardness).
• A freely selectable coil geometry (cylindrical coils, conical coils, biconical coils).
• Formation of a thread reserve winding.
• Free positioning of a final bead winding within the coil.
• Exact thread length measurement.
• Compensation of the drag length.

Claims (16)

Bobbin head for winding a thread on a bobbin (7), with a bobbin drive (2, 3) and a thread laying with an oscillating mounted on an axis of rotation (10) driven lever (5) for laying the thread in the longitudinal direction of the bobbin, thereby characterized in that the coil drive (2, 3) is formed by a friction roller (3), and that the friction roller (3) and the thread laying lever (5) each have a separate drive (2 or 4) have, which are both connected to a common winding head control (6). Bobbin head according to claim 1, characterized in that the friction roller (3) and the thread laying structurally combined into a winding head module and on a common one Carrier (1) are mounted, on which the winding head control (6) is also arranged. Spool head according to claim 2, characterized by a simple mechanism, such as for example a bayonet lock, for attaching the winding head module to one Textile machine. Bobbin head according to one of claims 1 to 3, characterized in that the thread laying lever (5) supporting axis of rotation (10) in the interior of a dustproof sealed Housing is guided, which at least parts of the drive of the thread laying lever (5) contains. Bobbin head according to one of claims 1 to 4, characterized in that the drive of the Thread laying lever (5) a drive member (13) fixed on the axis of rotation (10) and motorized drivable drive means (14) therefor, the drive member (13) and the drive means (14) are designed such that between the motor and the axis of rotation (10) there is a reduction. Bobbin head according to claim 5, characterized in that the drive member by a Angle segment (13) and the drive means are formed by a tooth sweater (14), which drives the angular segment. Bobbin head according to claim 6, characterized in that the drive of the angular segment (13) via a toothed belt that engages with or is attached to it he follows. Bobbin head according to claims 4 and 7, characterized in that the angular segment (13), the toothed belt and the tooth sweater (14) arranged inside the dustproof housing are. Winding head according to one of claims 3 to 8, characterized in that the friction roller (3) is attached directly to its drive (2). Winding head according to claim 9, characterized in that the drive (2) of the friction roller (3) is arranged within the cavity of the friction roller (3). Winding head according to one of claims 4 to 10, characterized in that a sensor for Detection of the passage of the thread laying lever (5) through the center of the stroke is provided. Winding head according to claims 6 and 11, characterized in that said sensor by a sensor attached to the angle segment (13) and a fixed one in the middle of the stroke arranged detector is formed. Spool head according to one of claims 1 to 12, characterized by a sensor for the Speed of the friction roller (3). Bobbin head according to one of claims 1 to 13, characterized by a sensor for the Speed of the coil (7). Use of the winding head according to one of Claims 1 to 14 on open-end spinning machines, such as rotor spinning machines. Use according to claim 15, characterized in that each winding head or each Spooling head module via a bus (16) to a bidirectional interface (17) to a master computer connected.

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