DE2138010A1 - Method and device for driving spindles at high speed for winding synthetic fibers and the like - Google Patents

Description

DIPL.-ING. KLAUS BEHN

DIPL.-PHYS. ROBERT MÜNZHUBER 2138010

PATENT LAWYERS

8 MUNICH 22 Wl DENMAYERSTRASSE 6 TEL. (0811) 22 25 30-29 5192

July 29, 1971 Our reference: A 24871 Pp / Pr / ib

Company SNIA VISCOSA SOCIETA ¹ NAZIONALE INDUSTRIA APPLICA-ZIONI VISCOSA, 18, Via Montebello, Milan / Italy

Method and device for driving spindles at high speed for winding synthetic fibers

and the same

The invention relates to a method and an apparatus for driving spindles or bobbins at high or very high speed and with the necessary precision for taking up or winding up fibers * woven threads and in particular synthetic fibers at a high length speed from a few thousand meters per minute.

The problem of winding at such high speeds has changed over the past few years

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formed by the technological development of the production facilities, and the desire is obvious to meet the increasing performance of such systems. The main problem to be solved is regular intake and Winding of fibers or threads at high length speeds, with which such threads are made is to maintain the necessary precision and to adhere to the tightest tolerances with regard to winding tension and expansion of the wound yarns, as well as also to do justice to the fact that the diameter of the reel to be wound is constantly increasing and yet A predetermined speed of length must be observed at all times.

In the previous devices for recording and "winding up, the spindle over which the sleeve-like According to the latest systems, the core of the coil is usually a motor with adjustable speed DC motor with controlled power supply, driven. The respective monitoring of the rotational speed of the drive motor, which has to decrease continuously with the increase in the bobbin diameter, is incumbent on one Signal transmission, which is controlled by one of an elastically oscillating

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on the lower arm and on that of the bobbin Yarn resiliently resting, movable roll takes place (in such a way that thereby the necessary tension for the Recording is fixed) so that their movements reflect any differences between the instantaneous Specify the circumferential speed of the bobbin and the longitudinal speed in the yarn feeder.

However, these known systems are not able, above a certain recording speed, which can be of the order of a few thousand meters an hour to work. The tenderness to respond and reaction is adversely affected by the inertia of the mechanical parts in motion, since their inertial masses, albeit small, also cause quite noticeable changes in the yarn tension.

In view of recent efforts to incorporate high-speed synthetic yarns and the like Therefore, devices were designed in which the threads run directly to the bobbin and Herzu various Means are proposed to ensure that the peripheral speed is at every moment of the Spooling in the tightest tolerances maintains a predetermined ratio to the length speed in the pad feed.

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This speed ratio, generally in the vicinity of the unit, is known to have various phenomena to take into account, such as the retraction of the material when exiting the stretching machine, the winding tension and other things. These factors go beyond the scope of the Invention beyond and within the limits of what plays a role here, it is sufficient if it is taken into account that between the length speed of the incoming material and the tangential winding speed a good predetermined relationship is strictly maintained.

The classical system initially proposed for this purpose consists in keeping the coil in motion set, or more precisely, the resulting winding around a spindle, which revolves freely through frictional entrainment from a roll with a suitable diameter at a constant angular velocity and consequently also at a constant one Peripheral speed is driven by this by friction with the surface of the resulting coil is transmitted, regardless of their diameter. This system has proven to be practical as not Proven satisfactory, especially at high speed, be it because of excessive pressure the role on the rocking surfaces in order to make a necessary

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Retain liability, be it because of the inevitable slippage that affects the actual recording speed counterfeit. Various other systems have been put forward to increase the peripheral speed of the spooled coil by acting on the drive means of the spindle and / or on the roller of the control tangential displacement of the winding.

The winding or spooling is known to have considerable Differences between the initial and final diameter. As a result, the angular velocity progressively decrease between the maximum and minimum values, especially since there is also a large difference can occur.

Surprisingly, it was found that, despite this large difference, the spindle rotation opposing forces (winding tension, frictional resistance of the bearings and the like, "ventilation" resistance, i.e. frictional phenomena, stray flux disturbances within the ambient air and others) with great approximation laws follow, according to which the pairs of forces opposing the spindle with a further change in the durometer in remain constant within narrow limits and, in practical terms,

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in the whole range of changes during winding or Winding.

Attempted experiments have largely confirmed this plague position. For example, within the limits of an absorption rate of ^ .OQQm / mLn, the value of the opposing force couple has proven to be essentially constant.

The invention according to and using the made Peststellung the spindle of the bobbin or reel by means of a known electric motor driven with constant power and / or power supply, so that the power of a predetermined torque is guaranteed to be slightly below and slightly above the effective power and possibly also measured as an experiment.

The constant torque motor is designed and / or mechanically connected to the spindle in such a way that there is sufficient "sliding" to achieve that the effective instantaneous speed of said spindle is greater than that obtained by the application of said constant torque to overcome the effective resistance at the various

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Record angular velocities arising differences can. A sliding motor or a pneumatic, hydraulic or mechanical one can also be used for this purpose Use a slip clutch between the motor and the spindle.

A roller of suitable diameter for controlling the peripheral speed is touched and tangential entrainment by the winding surface of the reel being wound kept in a precisely predetermined ratio between the speed of rotation and the speed of length, e.g. by drive by means of an alternating current synchronous motor, its frequency ratio to the frequency the production rate, stretching and feeding of the fibers is coordinated; instead of the motor can also a frequency generator driven by the system occurs. The drive power of the said role and the Contact conditions between roll and winding are selected and determined from the start so that the required Transmission of forces between the roll and the spool results in the said slight deficiency or excess of forces between the constant torque in the mechanism enclosing the spindle and that of itself to compensate for the moment of resistance that arises in the motor at any given moment.

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In other words, the method according to the invention shows itself in giving the winding mechanism a torque which is composed of the algebraic sum of a main part given predominantly to the spindle and a part transmitted by the tangential frictional entrainment between roller and winding, where this second fraction is done by means, h is a constant coincidence between peripheral speed of the control roller and the circumferential speed of the spooling secure. The power delivered to the spindle, which is also variable as the angular speed changes, is largely supplied by the motor as constant power and the remaining small fraction by the constant speed motor of the roller drive, with the changes occurring at any given moment between the resulting Speeds resulting from the application of the constant torque and corresponding to the tangential displacement of the roller at constant speed are absorbed by the sliding possibility of the motor or drive transmission of the said spindle.,

Trials have shown that it is generally more beneficial to attach a slightly elevated spindle to the spindle To give the moment required as the difference between the applied moment and the section modulus

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is withdrawn by touching the roller at the constant speed.

In practice, different drive means with constant or almost constant torque can be used will. For example, a compressed air turbine fed by a pressure regulator can be selected as the drive means, whereby For example, the pressure regulator through a control and reporting system with regard to the current diameter the unwinding responds. You can also use an electric motor with variable speed, but with constant power using a mechanical coupling, e.g. a friction coupling or preferably a pneumatic or hydraulic coupling is coupled to the spindle and has the ability to climb a to give in to a certain torque. A so-called "sliding motor" can also be used, its rotor to deliver a theoretically constant moment of force different Speeds.

These and other specific properties in the application of the possibilities indicated above are now in the course of a detailed description of an embodiment of the invention

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in a diagrammatic representation, particularly with regard to the electrical and electronic means used in the Device are included, and made more understandable with reference to the accompanying drawings. Show it:

Pig. 1 shows a schematic representation of the device according to the invention;

Fig. 2 is a graphical representation of the observed Constancy of the drag forces Cr with an average value M for the various diameters D. in the course of a winding j

Pig. 5 a schematic representation of a structural Simplification of a complete winding mechanism, together with the appropriate means the yarn feed, control of the winding speed and the drive, in a coordinated manner Relation to the feeding means for the threads., And the roller, which in turn is the length speed controlled for winding; and

Fig. 4 shows the main components of the aforesaid

Mechanism in side view in direction IV of FIG. 3.

According to the known technique, the winding device comprises a main shaft 16 of which the rotary movement the spindle runs out on which the bobbin B is wound, the diameter D of which is progressively increasing. The instant one Tangential speed Vt of the bobbin B is determined by a roller R of suitable diameter d 'and in constant tangential contact with the coil surface

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0988- t 170

and must be kept at every moment in a proportional relationship to the length speed, the yarn feed, which is determined by the diameter d ¹ 'and the angular speed of the cup or "godet" or the outlet C of the production plant and feed of said yarn.

According to the invention, said shaft is driven by a motor with constant torque Mc and under the conditions that the spindle in no case and at no angular velocity one over a expediently predetermined value lying torque is imposed. These conditions may be due to the appropriate Properties of the motor, only to deliver a constant torque, are guaranteed, or of a sliding (slip) accomplishes when the resisting force exceeds the value determined in this way, or else (as shown) through the interposition of a clutch C with the most constant Torque between motor and spindle 10, which determines said value; the drive system Mc and clutch C, as shown in FIG. 1, for example, corresponds to any constant torque drive system.

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The clutch can be of a mechanical type (friction clutch) * as well as hydraulic, pneumatic or preferred be controlled magnetically as well as electromagnetically, but in any case in such a way that between drive shafts and spindle a speed change takes place as soon as there is a torque difference above or below the clutch occurs.

™ This moment is approximated from a tentative obtained value from a complex of opposing forces surrounding the coil B in the range of variation the angular velocity determined as a function of the change in the diameter D and more precisely from a approximate mean value of the mentioned resistance-force couple.

The remainder of the opposing torque) is supplied by the roller R, which in turn is supplied by hers Motor Mv is driven at the required angular speed to achieve the desired length speed ratio to secure the yarn feed. This proportionality is secured, for example, if the Mv motor is a synchronous motor at the same frequency or in strict Relation to the frequency used in the plant for the yarn production or at least when

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"Godet" of exit C occurs. In general, the motor Mv is fed with a frequency generated and controlled by the frequency generator, which is connected to the end godet or outlet C and which is suitable for supplying a frequency Fv indicated by the yarn supply length velocity Vl, possibly a suitable electronic frequency Devices worked out frequency that should form the control signal Sv of the motor speed Mv. Since only a small amount of power is at stake here, the output god C could also be connected to an alternating current generator which feeds the synchronous motor Mv, so that the angular speed of the roller R is such that a circumferential speed at any moment under the desired conditions and proportions V _t can be delivered, which is in relation to the yarn supply length speed Vl.

The necessary positive or negative force couple is therefore transmitted by friction between the roller R and the bobbin B in order to cancel out the small changes in the moments of resistance supplied by the motor M with respect to the constant moments, or that of the system "Motor Mc-Clutch C ₀ "Delivered regardless of the peripheral speed, this being the same

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remains in the desired ratio to the length speed of the yarn supply.

Figs. 3 and 4 show a preferred embodiment of the device according to the invention. In these figures, the means and components _; which have already been mentioned are marked with the same reference numerals. In this embodiment, an electric motor M is provided which is fed by a known controlled power supply system A, so that the current is kept absolutely constant at each speed level. The current value is checked experimentally so that the constant torque on the output shaft 10 produces the above-mentioned effects.

According to a known constructive solution, the motor M with constant torque (or rather, the motor fed in this way is used to deliver a constant torque) has a suitable cooling system, for example a fan 12 a spindle around which the winding of the coil B takes place. From this main shaft Vo a drive force is branched off, for example by means of a second drive belt 18, in order to put the known thread monitor 20 into operation, which ensures a regular distribution of the thread over the axial extent of the

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Bobbin makes after the frequency in the transverse displacement of the thread monitor in relation to the angular velocity the spindle lies.

In the same Figure 5, a means known per se is also shown, for example, to achieve the desired ratio between the yarn supply speed V and the peripheral speed or tangential speed Vt of the synchronous motor Mv mentioned, or of a second, the said pulley or the output godet C actuating synchronous motor Ms driven roller R to obtain. In this case, motor Mv and motor Ms are fed from the rotary tromviechsler A or Ap and connected to _one another by speed converter V 1 in such a way that the frequency ratio of the two feeds can be regulated in a predetermined manner after the two current changers are in turn supplied by one (here not shown) connected to a speed converter motor are operated.

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Claims (1)

- 1 ο - PATENT CLAIMS 1. Procedure for a fast-running drive for winding synthetic fibers or the like by means of a spindle, which is driven by a drive and guide system to the bobbin diameter is set in motion according to variable speed, at the same time a Control of the current circumferential speed of the said coil by a constant contact with the outer surface of the coil Contact standing role is carried out, characterized in that said guide system to the The spindle-receiving mechanism imposes a predetermined and constant torque which is the mean value of itself the torque opposing the reel on the scale of the angular velocities at the beginning and at the end of reeling is approximated and that a strictly constant peripheral speed is imposed on the coil outer surface by means of said role which is in a certain relationship with the length speed of the plastic fiber feed line, -17- 109886/1708 wherein any possible differences between the recalcitrant torque and the predetermined constants and constructively ¹ torque are balanced, 2. The method according to claim 1, characterized in that that said predetermined and constant torque is slightly larger than the opposing torque and that said role exerts a braking effect on the spool in order to distinguish between opposing and at the Compensate spindle torque applied. 5. The method according to claims 1 and / or 2, characterized characterized in that said roller is driven by means of a synchronous motor, the frequency feed of which is im there is a strict relationship to the length of the fiber feed line. 4. The method according to claim 3, characterized in that that said synchronous motor is fed with a certain frequency, which in turn determines the angular velocity of the rotating end and outlet organ (Qodet) of the fiber feeding device in the winding and Mud complex determined. - 18 109886/1708 5. The method according to claims 1 and 2, characterized in that that a feed system is used in which between the rotating movement distributing and This movement absorbing means, in particular here the spindle, a device is switched on, which prevents that the spindle is subjected to a torque greater than the predetermined and constant torque. 6. The method according to claim 5, characterized in that a motor is used, the rotor one opposite to the power consumed, can assume variable speed and is fed in such a way that the said predetermined and constant torque is not exceeded. 7 * The method according to claim 5, characterized by the Use of a motor with controllable speed and preferably with substantially constant torque, the is by no means below the predetermined torque and by a switched on between the motor and the spindle and calibrated torque limiter, so that in no case a torque is output that is above the predetermined constant torque could be. - 19 109886/1708 8. Device for driving the spindle in one up. winding and spooling device for piping, yarn and the like, in particular synthetic fibers, the supply of which takes place at high and very high linear speeds, whereby this device has a motor with variable speed to drive the spindle and a roller, which with a predetermined diameter for the purpose of tangential entrainment of the roller permanently in contact with the outer surface of the itself is in formation coil, characterized in that the device drive (Mc) and / or transmission means (10,16) which are suitable for imposing a constant torque on the drive mechanism for the spindle, which approximately corresponds to the average torque opposite of the spindle and the spool, and that drive means (Mv) are present for actuating said roller (R) in order to keep it constant To give peripheral speed, which is in a predetermined ratio to the length speed of the supply line the Pasern stands. 9. Apparatus according to claim 8, characterized in that that to drive the spindle, an electric motor (Mc) is provided with adjustable speed, which in connection with the - 20 109886/1708 at the. Output shaft (16) output power is, and that its power supply to the rotating motor part in the Weisre a constant current provides that the torque the predetermined and constant torque, regardless of itself opposing torque on the output shaft » 10. Apparatus according to claim 8, characterized in that * that they use an electric motor (Mc) to drive the spindle “Itzt, whose essentially constant torque is not is below the predetermined torque, and that a calibrated to the predetermined torque to be transmitted There is a torque limiter coupling (Cc) between the motor shaft and the spindle. 11. The device according to claim 10, characterized in that that they have a mechanical torque limiter clutch (Cc) | having. 12. The device according to claim 10, characterized in that that it has a torque limiting clutch (Cc) operating with fluid. 15. Apparatus according to claim 10, characterized in that that it has a magnetic or electromagnetic torque limiting clutch (Cc). - 21 109886/1708 14. Device according to one of claims 8-13, characterized in that that to drive the mentioned roller (R) a synchronous motor (Mv) with constant speed and with a Torque not less than the greatest difference between the currently resisting torque and the predetermined one and constant torque is provided, the speed of said synchronous motor (Mv) from a frequency, proportional to the length speed (Vl) of the fiber feed, is determined and controlled. 15. Device according to claim 14, characterized in that that the drive motor (Mv) of the roller (R) in its speed of one, the speed of the rotating outlet organs (Godet) (C) the fiber or thread supply determining proportional frequency (Fv) is controlled. 16. The device according to claim 15, characterized in that that said drive motor (Mv) for the roller (R) is fed and controlled by a frequency which corresponds to the rotation the rotating outlet member (0) is removed. 109886/1708