EP0950627A1 - Method and device for winding a yarn fed with constant speed onto a bobbin - Google Patents

Abstract

To wind a continuous yarn into bobbins, the rotary speed of the bobbin (5) and the speed of the reciprocating yarn guide (2) are controlled so that the yarn (F) movement speed (VG) remains constant independently of the pitch angle ( alpha ) of the laid yarn on the bobbin. The position of a vector representing the yarn movement speed (VG) is determined from the bobbin parameters of the pitch angle ( alpha ) of the laid yarn on the bobbin and the reciprocating yarn guide speed and the bobbin rotary speed in a spread coordinate system. The vector is used to give the computed values of the reciprocating yarn guide speed and the bobbin rotary speed. The orientation of the vector can be shifted on a change of the laid yarn pitch angle ( alpha ), but not its value. An Independent claim is included for a bobbin winder with a control (9) with an input to take the yarn travel speed (VG) and the bobbin parameters. The control (9) computes the pitch angle ( alpha ) of the laid yarn on the bobbin, and maintains a constant yarn travel speed (VG) on changing laid yarn pitch angles ( alpha ) and the required bobbin (5) and reciprocating yarn guide speeds. Preferred Features: Each drive cylinder for the bobbins (5) has a servo motor, through which the rotary speed of the drive cylinder from the central drive shaft is overlaid to give the drive cylinder speed for the required bobbin (5) surface speed. The drive cylinder is mounted at the central drive shaft with a planet wheel meshing with a sun wheel keyed to the drive shaft, with an additional drive from the servo motor to the planet wheel. Or the drive cylinder is linked to the drive shaft through a conoid gearing, with a sliding belt drive transmission in addition from the servo motor at the conoid of the drive cylinder. The drive cylinder can have inner teeth to mesh with the planet wheel or the second conoid.

Description

The present invention is in the field of thread winding into shape a coil, which process also as winding or as the production of a winding referred to as. When a second coil is made from a first coil, the speaker speaks one also of rewinding, whereby in the winding of a textile company predominantly this Rewinding takes place.

The winding or winding of a thread is known to be done with winding machines that work according to different winding laws and thereby either a wild winding or make a precision winding or a step precision winding. The relevant Spool parameters are in particular the so-called turn ratio (number of spool revolutions per double stroke), the pitch angle determined by the turns ratio the thread laying, which corresponds to half the crossing angle, and the Speed.

Wild winding is understood to mean windings whose turns ratio increases with increasing Coil diameter decreases continuously, with the crossing angle constant remains. The constant crossing angle over the entire coil diameter has one good dimensional stability and transportability of the coil produced in this way. disadvantage arise due to unfavorable number of turns, which occur during the coil build-up at certain Make coil diameters noticeable as so-called images or image zones. In these zones, thread is placed directly next to thread or even thread on thread. The consequence of these image zones is an uneven yarn development, which can later lead to tension peaks during unwinding. As for the following Processing processes almost consistently with high to very high take-off speeds the image zones represent a very serious disadvantage.

With the precision winding, the turns ratio remains during the entire winding process constant. The crossing angle changes and increases with increasing coil diameter Sharpener. A precision-wound coil knows with an optimally selected number of turns no image zones, which results in very good printing properties. On the other hand is the dimensional stability due to the change in the pitch angle over the coil structure the thread laying is not so good.

The step precision winding represents a combination of the two winding laws, wild Winding and precision winding. In the case described in DE-A-33 32 382 Winding machine will combine the advantages of these two winding laws achieved that in a winding machine with a driven by a motor drive Driving roller and with a driven by a gear with variable ratio Thread laying to produce a precision winding the drive roller of one Fixed ratio drive and the transmission for thread laying is adjusted by an actuator controlled by a computer, each with a speed sensor for measuring the speed of the package and thread laying with the Computer is connected.

At the start of winding, the turns ratio is specified and after the crossing angle has been decreased the computer switches to a predetermined amount by a predetermined amount lower number of turns. This creates concentric rings with precision winding, the number of turns from ring to ring with increasing coil diameter abruptly discreet specified value so that the crossing angle only in narrow limits. The approximately constant crossing angle corresponds to one wild winding and maintaining the turns ratio in diameter steps a precision winding.

There has long been a desire to have the coils directly on the game-generating machine, especially the spinning machine, to manufacture and thus to do without rewinding processes can. On spinning machines only wild windings are and these are only of moderate quality. The known methods do not allow proper precision winding because the crossing angle is only in one relatively narrow range can be varied over the entire coil, this range must be chosen so that it can be handled by the stretch properties of the thread is. With such minimal changes in the crossing angle, however, the coil does not more the required quality and especially in the marginal areas on the inside Sleeve and outside on the coil circumference relatively large quality deviations.

The invention relates to a method for winding at a constant speed delivered thread by means of a thread traversing device to a bobbin with precision or step precision winding. The method according to the invention is intended to be used on yarn-producing or yarn-treating machines, in particular on spinning machines of all kinds, should be suitable and the manufacture of precision or step precision windings enable directly on these machines. The device should be so inexpensive to carry out the method according to the invention that it can be used in large numbers on the machines mentioned.

The object is achieved according to the invention in that the speed the bobbin and the speed of thread traversing are controlled so that the speed of the thread is constant regardless of the pitch angle of the thread laying remains.

The invention further relates to a device for performing the inventive Method, with a bobbin drive, a drive for the thread traversing device and with a controller assigned to these drives. The device according to the invention is characterized in that the controller the values for the thread speed and the winding parameters are supplied, and that in the controller a calculation the pitch angle of the thread laying and that for maintaining a constant Thread speed required with changing pitch angle of the thread laying required Speed of the bobbin and thread traversing takes place.

The invention also relates to a device for carrying out the process according to the invention Process on one central drive shaft for the individual production units containing process machine, with a drivable by the central drive shaft Driving cylinder for the bobbin and a drive for the thread traversing device.

The device according to the invention is characterized in that each drive cylinder a servo motor is assigned, by means of which the one supplied by the central drive shaft Speed of the drive cylinder a speed is superimposed so that one of the desired Peripheral speed of the coil corresponding speed of the drive cylinder results.

This is a first preferred embodiment of the device according to the invention characterized in that the drive cylinder is mounted on the central drive shaft and over a planet gear from a sun gear firmly connected to the central drive shaft is driven, and that the planet gear can also be driven by the servo motor.

This embodiment has the advantage that all transmissions of the movements are positive, So realized without slippage and therefore no sensors for speed monitoring required are. In addition, the planetary gear can be designed so that the servo motor only a small part of the power required for the coil drive must deliver. This allows the use of a relatively weak motor accordingly low cost.

A second preferred embodiment of the device according to the invention is thereby characterized in that the drive cylinder is mounted on the central drive shaft and is driven by a conoid gear, one of which has a conoid with the central one Drive shaft is firmly connected and via a movable by the servo motor Belt drives the other conoid connected to the drive cylinder.

Fig. 1

eine schematische Darstellung des Funktionsprinzips einer erfindungsgemässen Spulvorrichtung zum Aufwickeln eines mit konstanter Geschwindigkeit gelieferten Fadens aufeine Spule,

Fig. 2

ein Diagramm zur Funktionserläuterung,

Fig. 3

eine schematische Darstellung einer Spulvorrichtung, die auf einer mit einer zentralen Antriebswelle für die einzelnen Produktionseinheiten ausgerüsteten Prozessmaschine angeordnet ist,

Fig. 4

ein Detail von Fig. 3; und

Fig. 5

eine Variante von Fig. 4.

The invention is explained in more detail below on the basis of exemplary embodiments illustrated in the drawings; it shows:

Fig. 1

1 shows a schematic representation of the functional principle of a winding device according to the invention for winding a thread delivered at a constant speed onto a bobbin,

Fig. 2

a diagram to explain the function,

Fig. 3

1 shows a schematic illustration of a winding device which is arranged on a process machine equipped with a central drive shaft for the individual production units,

Fig. 4

a detail of Fig. 3; and

Fig. 5

a variant of Fig. 4th

The device shown schematically in FIG. 1 essentially consists of a thread feed mechanism 1, which receives a thread F to be wound from a process P. and to a thread traversing device 2, which feeds the thread F through one Motor 3 driven coil sleeve 4 coils, whereby a coil 5 is formed. The Thread traversing device 2 comprises, as shown, a thread guide 6 which a string or belt 7 is driven by a motor 8. The thread traversing device 2 and the coil sleeve 4 with the motor 3 form a winding unit, which here is not described in detail.

In this connection, reference is made to EP-A-0 453 622, EP-A-0 828 444, EP-A-0 838 422 and to the preciflex thread laying marketed by Schärer Schweiter Mettler AG.

The motor 3 for the bobbin drive and the motor 8 of the thread traversing device 2 are connected to a control unit 9, which includes a microprocessor or Microcontroller contains, and in which the various winding parameters can be entered. In addition, there are sensors (not shown) for the speed of the motor 8 and the position of the thread guide 6 and provided for the speed and position of the motor 3, which are also connected to the control unit 9.

The process designated by P in FIG. 1 stands for any yarn manufacturing or yarn treatment method, for example a spinning or texturing method, by means of which the thread F is delivered at a constant speed V _G. From this thread, for example, a spool with precision or step precision winding is now produced directly on a spinning machine and bypassing the rewinding process previously required, precision winding meaning that the turns ratio remains constant during the winding process. The pitch angle of the thread laying or crossing angle changes according to the constant turn ratio and becomes more acute with increasing bobbin diameter. This crossing angle is designated in FIG. 1 by the reference symbol 2α and is drawn on the coil 5.

annehmen soll, dann müssten die genannten Geschwindigkeiten entsprechend geändert werden. Wie leicht zu sehen ist, müssen zwei der Geschwindigkeiten geändert werden und eine kann konstant bleiben. Gemäss Fig. 2 wird die Fadengeschwindigkeit V_G konstant gehalten und die Geschwindigkeiten V_F und V_S des Fadenführers 6 bzw. der Spule 5 werden an die durch die Änderung des Steigungswinkels α bedingte geänderte Orientierung des Vektors V_G angepasst.FIG. 2 shows a diagram in which the speed V _{F of} the thread guide 6 is entered on the abscissa, the rotational speed V _{S of} the bobbin 5 and the thread speed V _G determined by these two speeds are entered on the ordinate, the thread speed with the abscissa Inclination angle α includes. If the slope angle α changes and, for example, the value α

should assume, then the speeds mentioned would have to be changed accordingly. As can be easily seen, two of the speeds have to be changed and one can remain constant. 2, the thread speed V _{G is} kept constant and the speeds V _F and V _{S of} the thread guide 6 or the bobbin 5 are adapted to the changed orientation of the vector V _G caused by the change in the pitch angle α.

This adaptation takes place in that the microprocessor contained in the control unit 9 from the entered winding parameters and from the diameter of the coil 5 the respective instantaneous value of the pitch angle and the corresponding position of the vector of the thread speed V _G and from this and from the amount supplied by the thread delivery mechanism 1 V _G calculates the respective values for the speed V _{F of} the thread guide 6 and the speed V _{S of} the bobbin 5 and controls the motors 8 and 3 accordingly.

In this way, a directly on a spinning machine with relatively little effort Bobbin with, for example, precision winding, and in the next yarn processing stage, for example in weaving.

As indicated in Fig. 1 by a dashed thread course, can be an option in Thread run between the thread feed mechanism 1 and the thread traversing device 2 one in In the direction of the double arrow A adjustable roller 10 can be provided, via which the thread F is performed. This role is used only to compensate for small fluctuations the thread tension and in no case has the function of a thread store. As a further option, you can use a movement controlled by the control unit Roll 10 does not only compensate the thread tension, but influence it in a targeted manner.

Since today's usual spinning machines or texturing machines or general process machines a central drive shaft for driving the individual production units have, it is more economical when using the winding device described such process machines for driving the coils not those shown in Fig. 1 Motor but to use a drive derived from the central drive shaft.

Of course, it should be noted that the principle of constant thread speed maintain for any desired pitch angle of thread laying must become. This means that the drive from the central drive shaft to the Coil must be designed so that individual control of the speed of the coil is possible.

3 shows the arrangement of the winding device on a central drive shaft Process machine shown, and Figures 4 and 5 each show an embodiment for the coil drive derived from the central drive shaft.

The winding device shown in FIG. 3 differs from that shown in FIG. 1 essentially in that the coil 5 does not come from a driving the coil sleeve 4 Motor (Fig. 1) is driven, but by one of the central drive shaft 11 of the relevant process machine driven drive cylinder 12. The process machine is a yarn production or treatment machine, for example one Spinning or texturing machine. The reference symbol A is closer to that in FIGS. 4 and 5 shown, individually controllable drive of the drive cylinder 12. Of the Drive cylinder 12 is rotatably mounted on the central drive shaft 11 in both cases and has an internal toothing.

4, the individually controllable drive of the coil 5 takes place via a planetary gear between the central drive shaft 11 and the drive cylinder 12. A sun gear 13 is fixedly connected to the central drive shaft 11, the rotation of which is transmitted to the drive cylinder 12 with a planet gear 14. The planet gear 14 is carried by a web 14 ', which can also be driven by a servo motor 15 via a drive wheel 16. The speed of the servo motor 15 is selected so that a speed is superimposed on the drive wheel 16 for the web 14 'of the planetary gear 14 so that the speed of the drive cylinder 112 and thus the peripheral speed of the bobbin 5 corresponds to that for the constant thread speed V _G (FIG 2) Required value reached.

The embodiment shown in Fig. 4 has the advantage that all movement transmissions positively, that is, realized without slip. Since the translations of a planetary gearbox are therefore not sensors for speed monitoring required. In addition, the servo motor 15 needs with an optimal design of the planetary gearbox only a small part of those required for the coil drive To deliver power, making a relatively weak engine with a correspondingly low cost can be used.

In the variant shown in FIG. 5, a conoid gear is used instead of the planetary gear used, of which a conoid 17 is fixedly arranged on the central drive shaft 11 is and drives the other conoid 19 via a flat belt 18, which in Engagement with the internal toothing of the drive cylinder 12 is. To adjust the speed of the drive cylinder 12, the belt 18 is actuated by a servomotor 15, bracket-like or fork-like adjusting element 20 can be displaced along the surface of the conoid. Since this system works with frictional connection, the speed of the Driving cylinder 12 with a sensor (not shown) required. Because the shift of the flat belt 18 requires only a small amount of force, which requires the Sensor drive 16 forming motor only a relatively low power here.

Claims (9)

Method for winding up a thread (F) delivered at a constant speed by means of a thread traversing device (2) to form a bobbin (5) with precision or step-precision winding, characterized in that the speed (V _S ) of the bobbin (5) and the speed (V _F ) of the thread traversing are controlled in such a way that the speed (V _G ) of the thread (F) remains constant regardless of the pitch angle (α) of the thread laying. Method according to claim 1, characterized in that from the winding parameters the pitch angle (α) of the thread laying and from this in a coordinate system spanned by the speed (V _F ) of the thread traversing and the speed (V _S ) of the bobbin (3) the vector speed representing the thread speed (V _G ) is determined and from this vector the associated values of the speed (V _F ) of the thread switching and the speed (V _S ) of the bobbin (3) are calculated. A method according to claim 2, characterized in that said vector with a change in the pitch angle (α) of the thread laying, its orientation, but does not change its amount. Device for carrying out the method according to claim 1, with a bobbin drive (3), a drive (8) for the thread traversing device (2) and with a controller (9) assigned to these drives, characterized in that the controller (9) has the values for the thread speed (V _G ) and the winding parameters are fed, and that in the controller (9) a calculation of the pitch angle (α) of the thread laying as well as that for maintaining a constant thread speed (V _G ) with changing pitch angle (α) of the thread laying required speed (V _S , V _F ) of the bobbin (5) and thread traversing. Device for performing the method according to claim 1 on a central Drive shaft (11) for the process machine containing the individual production units, with a drive cylinder (12) which can be driven by the central drive shaft (11) for the bobbin (5) and a drive (8) for the thread traversing device (2), thereby characterized in that each drive cylinder (12) is assigned a servo motor (15), through which the speed of the central drive shaft (11) delivered Driving cylinder (12) a speed is superimposed so that one of the desired peripheral speed speed of the drive cylinder (12) corresponding to the coil (5) results. Apparatus according to claim 5, characterized in that the drive cylinder (12) of the central drive shaft (11) and supported by a planet gear (14) the central drive shaft (11) is firmly connected to the sun gear (13), and that the web (14 ') carrying the planet gear (14') can also be driven by the servo motor (15) is. Apparatus according to claim 5, characterized in that the drive cylinder (12) the central drive shaft (11) and driven by a conoid gear , of which the one conoid (17) is firmly connected to the central drive shaft (11) is and via a by the servo motor (15) displaceable belt (18) with the Driving cylinder (12) drives another conoid (19). Apparatus according to claim 6 or 7, characterized in that the drive cylinder (12) has an internal toothing with which the planet gear (14) or the second conoid (19) is engaged. Device according to one of claims 5 to 8, characterized in that the process machine is formed by a spinning or texturing machine.

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