EP0202253A1

EP0202253A1 - Tangential belt control for spinning loom or twister.

Info

Publication number: EP0202253A1
Application number: EP85905386A
Authority: EP
Inventors: Horst Wolf; Ernst Halder; Norbert Stadele
Original assignee: Zinser Textilmaschinen GmbH
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 1984-11-10
Filing date: 1985-10-16
Publication date: 1986-11-26
Also published as: ES548720A0; US4730448A; WO1986002958A1; ES8701245A1; DE3570252D1; EP0202253B1; JPH0718059B2; JPS62500731A

Abstract

Commande à courroie tangentielle pour une pluralité d'unités de travail similaires (4), disposées sur au moins une ligne l'une à côté de l'autre, et cela dans une machine (1) pour la production de fil retordu. Le long de cette commande à courroie (10, 11) les unités de travail sont disposées en groupes ayant à peu près le même nombre d'unités (4), pour chaque groupe il est prévu au moins un moteur électrique (19, 23) et des moyens de guidage (14, 17, 20, 21) agissant sur les courroies (10, 11). Pour diminuer les pertes d'énergie d'une telle commande, il est prévu de diminuer sensiblement aussi bien la largeur que l'épaisseur de la courroie tangentielle (10, 11), en particulier en choisissant sa largeur entre 7 et 14 mm et son épaisseur entre 2 et 2,7 mm. Cela est possible par le fait que le nombre d'unités de travail (4) d'un groupe est choisi de manière à être en rapport avec la puissance absorbée et avec l'allongement admissible de la courroie. Dans un développement ultérieur de l'invention, il est prévu que les courroies tangentielles (10, 11) des groupes d'unités voisines soient guidées par des poulies (15, 16, 20, 21) couplées ensemble de façon rigide.Tangential belt drive for a plurality of similar working units (4), arranged on at least one line next to each other, and this in a machine (1) for the production of twisted yarn. Along this belt drive (10, 11) the working units are arranged in groups having approximately the same number of units (4), for each group there is at least one electric motor (19, 23). and guide means (14, 17, 20, 21) acting on the belts (10, 11). To reduce the energy losses of such a control, provision is made to substantially reduce both the width and the thickness of the tangential belt (10, 11), in particular by choosing its width between 7 and 14 mm and its thickness. thickness between 2 and 2.7 mm. This is possible by the fact that the number of working units (4) of a group is chosen so as to be in relation to the absorbed power and to the admissible elongation of the belt. In a further development of the invention, it is provided that the tangential belts (10, 11) of groups of neighboring units are guided by pulleys (15, 16, 20, 21) rigidly coupled together.

Description

Tangential belt drive for a spinning or twisting machine

The invention relates to a tangential belt drive for a multiplicity of similar working units of a machine for producing twisted or twisted threads arranged in at least one row next to one another, in which the working units in fields with at least approximately the same number of each an endless tangential belt driven working units are divided, with each field having at least one electric motor driving the associated tangential belt and deflection means for the tangential belt.

Tangential belts of the type mentioned at the beginning are used, for example, in ring spinning machines, ring twisting machines, open-end rotor spinning machines or open-end friction spinning machines or the like. used. In these machines, the work units such as spindles, rotors or opening rollers or the like. arranged in one or two rows next to each other and driven by tangential belts that run against the whorls of the working units. It is common practice to drive the tangential belt in the area of one of the front ends of the machine and to deflect it in the area of the other front end. As a result of the wrapping on the

^ Whirling and the necessary pressure rollers cause considerable energy consumption and belt wear due to flexing work on the large number of work units. This energy consumption and belt wear increases with an increasing number of work units, but overall also per work unit, since the tangential belt must be made thicker and / or wider when the work units are increased in order to transmit the required power. Since the number of work units in a ring machine can be, for example, 1000 and more, tangential belts with a width of 35 to 38 mm and a thickness of 3 to 3.7 mm are used in practice.

In order to reduce the stress on a tangential belt running through the entire machine, it is also known (DE-OS 33 01 811) to arrange at least one electric motor at each end of the machine and to use the deflection pulleys there to drive the tangential belt. It is preferably provided that driven deflection pulleys are provided in the four deflection points of the tangential belt. In addition, it has also become known (PCT-WO 84/02 932) to introduce a further drive into the tangential belt at least one further point between the machine ends by means of a driven friction disk. However, the success of these measures with regard to the stress on the tangential belt is limited.

A tangential belt drive is also known (DE-AS 11 41 571), in which the work units arranged in rows next to one another are divided into fields which have at least approximately the same number of work units which are each driven by an endless tangential belt . An electric motor and deflection elements are assigned to each of these tangential belts in a field. With this type of construction, the tangential belt drives intermediate rollers, which in turn drive the work units via endless straps. This The design of a tangential belt drive has not found its way into practice.

The invention has for its object to provide a tangential belt drive of the type mentioned, in which power losses and / or belt loads can be reduced.

This object is achieved in that the number of work units of each of the fields is determined taking into account the drive power required for this number of work units and a permissible belt stretch such that the tangential belts have a width between 7 and 15 mm and a thickness between 2 and 2.7 mm.

The use of tangential belts dimensioned in this way substantially reduces the power loss which results in particular from flexing work, so that overall a lower drive power is required. The stress on the individual tangential belts is correspondingly lower. Although it is an additional effort due to the increased number of motors, the controls and brackets or the like. required, but which is more than offset by the achievable advantages. Because of the lower energy losses in the tangential belts, the overall energy requirement is reduced. In addition, it is found that when using a plurality of smaller motors, all of which have the same size, there is a price advantage, since these smaller motors are manufactured in larger numbers, so that several smaller motors are also cheaper. as a single motor with the same overall performance.

In a further embodiment of the invention it is provided that the contact elongation of the individual tangential belts is limited to 0.6% to 1.5%. It has been shown that the belt stress can be kept low during this measure moreover, the tolerances resulting from belt expansions with regard to the rotational speeds of the individual working units are kept within tolerable limits.

In a further embodiment of the invention it is provided that the tangential belts of adjacent fields are guided over at least one common deflecting roller element, the deflecting rollers of which are coupled or can be coupled in a rotationally fixed manner. As a result, a certain synchronization of the speeds between the individual fields is obtained, which is particularly advantageous when the drive is switched off or fails due to a power failure, since all the working units then run out largely uniformly.

In a further embodiment of the invention it is provided that the deflecting roller elements are each arranged between two adjacent working units. This measure "ensures that no space in the spindle division is lost. In order to avoid loss of transmission, it is further provided that the tangential belts run directly against whorls of the working units.

In a further embodiment of the invention it is provided that the fields are delimited by four deflection rollers in a two-row arrangement of the work units and that the associated electric motors are arranged in the middle between the two rows. In this way, on the one hand, an available space for accommodating the electric motors is used, while on the other hand the diameter of the deflection rollers can also be dimensioned such that they can be arranged between adjacent work units without changing the machine part. In this case, deflection roller elements are used, each consisting of two deflection rollers arranged one above the other in the axial direction, on which the tangentially displaced tangential belts of the adjacent fields are deflected. In a further embodiment of the invention it is provided that in a two-row arrangement of the working units the whorls of the working units are arranged on the side of the tangential belt facing away from the longitudinal center of the field and the deflection roller elements are arranged on the side of the tangential belt facing the longitudinal center . This ensures that good spatial utilization is obtained and that the work units are not subjected to additional loads either.

In a further embodiment of the invention it is provided that the number of work units in a field is between 80 and 150 work units. It has been shown that there is an optimum in this area both for the cross-section of the tangential belts and for the required power of the individual drive motors.

Embodiments of the invention are shown in schematic drawings. On the basis of these exemplary embodiments, the invention will be explained and described in more detail.

Fig. 1 shows a partial view of a machine with two parallel rows of similar work units;

Fig. 2 shows a partial view of a machine with a number of similar working elements;

Fig. 3 shows a partial view of a machine with two parallel rows of similar or in each row of similar working aggregates;

Fig. 4 shows a side view of a deflection element and two working units designed as spindles;

Fig. 5 shows a top view of the part of the machine shown in Fig. 4;

6 cross sections through the spindle bank of a ring spinning machine, and 7th In the first exemplary embodiment according to FIG. 1, the machine, designated overall by 1, has two parallel rows 2 and 3 together, of the same type of work units 4 driven at the same speed. These working units 4 can be spindles, for example, wherein FIG. 1 can then be understood as a plan view of the spindle area of a ring spinning machine. 4, each spindle 14 is mounted in a spindle bearing 5, which is fastened with the aid of a nut 6 to a spindle bench 7, which in each case leads along the relevant machine side. Each spindle 14 has a whorl 8, on which it is driven by a tangential belt 10 or 11. Pressure roller hangers 12 of the same design serve to place the tangential belts 10, 11 against the whorls 8.

In Fig. 1 the whorls 8 of a first group of twelve working units 4 of each row 2 and 3 are represented by a first, endless tangential belt 10 and each further group of twelve working units 4 of both rows 2 and 3 are each by further tangential belts The tangential belt 10 is guided through deflection rollers 14, 15, 16 and 17 and loops around the drive roller 18 of an electric motor 19. The tangential belt 11 is through deflection rollers 20 which are coaxial with the deflection rollers 15, 16 and 21 and two further deflection rollers, which are no longer visible, are guided and wrapped around the drive roller 22 of an electric motor 23. As can be seen from FIGS. 6 and 7, adjacent tangential belts are each offset in height from one another.

1 shows only the first tangential belt 10 and part of the second tangential belt 11 on the ring spinning machine 1. However, a broken line indicates that the machine is longer, with considerably more work units and a larger number being arranged along the machine Tangential straps can be present. For the sake of simplicity of illustration, only 24 driven working units are shown for each tangential belt. In reality, each tangential belt drives between 80 and 150 spindles depending on the energy requirement of a spindle, so that between 12 and 7 tangential belts can be arranged in a ring spinning machine with, for example, 1000 spindles. According to the invention, the deflection rollers of mutually adjacent tangential belts are also connected to one another in a rotationally fixed manner and form a deflection roller element. For example, Fig. 4 shows that the pulleys 15 and 20 are attached to a common shaft 24. The same applies to the deflection rollers 16 and 21. The shafts 24 of the deflection rollers are rotatably supported in bearings 25, which are by nuts

26 are connected to the spindle bench 7.

2 shows a machine 1 'with only one row 2 of working units 4. This can be the spindles of a one-sided spinning machine or the drive of the rotors on one side of an open-end spinning machine. Here, too, a first group of twelve work units 4 of the only row 2 is driven by a first tangential belt 10 ', a second group of twelve work units 4 by a second tangential belt 11 *. Additional tangential belts can drive other groups of work units. The tangential belt are driven by electric motors 19, 23, respectively ^*, a drive roller 18 or 22 is seated on the shaft 'or 11' is um¬ swallowed up by the respective tangential 10th

Each tangential belt 10 ", 11 'runs over three deflection rollers 26, 27 28 and 29, 30 (the third is no longer visible), the deflection rollers arranged one above the other also here

27 and 29 are connected to one another in a rotationally fixed manner and form a deflecting roller element common to both adjacent tangential belts 10 'and 11'.

The machine 1 "of the third exemplary embodiment shown in FIG. 3 again has two rows 2 and 3 of work units 4. However, only groups of twelve work units 4 of each row are separated by a respective belt 10" or 11 "driven, so this embodiment corresponds to a doubling of the embodiment of FIG. 2. The drive of the two rows of working units is therefore independent of one another. A number of work units can, for example, stand while the other is running - this happens if the work units are the spindles of a ring spinning machine with independently driven sides. E.g. However, a series of work units can also be driven at a different speed than the other - this occurs, for example, if the work units are rotors in one row and open-end opening rolls in the other row -Spinning machine is acting. The motor 19 drives here via its drive pulley 18 the tangential belt 10 "which drives a group of work units 4 of the row 2 and which is guided over the deflection rollers 26, 27, 28. A second motor 23 drives the next tangential belt 11 via its drive pulley 22 ", which is guided over the deflection roller 29, which is located under the deflection roller 27 and is connected in a rotationally fixed manner thereto, a deflection roller (not shown) corresponding to the deflection roller 27 of the first tangential belt 10" and the deflection roller 30. Further tangential belts are arranged accordingly and led.

Row 3 of the working units shows the end of such a row: a last drive motor 31 drives, via its drive disk 32, the last tangential belt 33 of this row, which is also guided over three deflection rollers 34, 35, 36. The deflection roller 34 is again part of a deflection roller element which is common to the tangential belt 33 and the tangential belt 37 adjacent to it.

Due to the fact that only about 80 to 150 spindles are driven by a tangential belt, the tangential belts can be selected to be considerably thinner and narrower than a single tangential belt which drives all working units of a machine or all working units of a series.

The tangential belt can have a width between 7 and 14 mm and a thickness between 2 and 2.7 mm. This results in a cross section of 14 to 38 mm ² or a reduction in the cross section to 15-30% of the belt used hitherto. The contact elongation measured when the machine is at a standstill should be as low as possible and be between 0.6 and 1.5%. The tangential belt can be made from polyamide, polyester or from mixtures based on polyamide or polyester, for example under the trade names " Kevlar "or" Ara id "are known. If the tangential belt is made of polyester, for example, the contact length will be 1 to 1.5%. In the case of a mixture of the aforementioned type, there is an extension of contact between 0.3 and 1%.

Due to the small dimensions of this tangential belt as shown in Fig. 6 and 7 is shown, e _^ cattered along the course of a tangential belt at least one further, similar Tan¬ gentialriemen 10 a and 11 a to the reserve in the machine, preferably, in the spindle rail 7 be housed. For protection, this reserve belt can be surrounded by a plastic cover 38 and arranged in a holder 36, which is fastened within the spindle bench 7. If there is damage to the tangential belt, the tangential belt can be removed from the plastic cover and put on without great delay. Corresponding to the height offset of adjacent tangential belts, this holder 39 can be arranged once above (FIG. 7) once below (FIG. 6) the tensioning roller suspension 12.

Electric motors that drive tangential belts, which have common deflection elements and therefore run synchronously, have a common power supply. The electric motors are three-phase motors that are supplied with three-phase current from the speed control device via a line. In the embodiment of FIG. 2, all belt drive motors 19, 23 .... of the spinning machine are connected in parallel to a line 40, which is connected to the network 42 via a control device 41. The control device 41 allows all connected motors to be switched on and off together. It can also have means for changing the speed of the motors, for example by changing the feed frequency. In the embodiment of FIG. 3 it is assumed that the working elements 4 of the two rows 2 and 3 should be able to be operated independently of one another. There are therefore two control devices 41 and 41 'which can be actuated independently of one another, of which the control device 41 controls the motors 19, 23 .... via a line 42, which controls the tangential belts 10 ", 11" and via these the Drive working elements 4 of row 2. The control device 41 'feeds the motors 31, ... which move the tangential belts 37, 33 ...., which drive the working elements 4 of the row 3, via a line 43. If all working elements are to be operated in the same way, only one control device is required, to which all motors must then be connected.

Claims

1. Tangential belt drive for a multiplicity of similar, in at least one row side by side arranged working units of a machine for producing twisted or twisted threads, in which the working units in fields with at least approximately the same number of working units driven by an endless tangential belt are divided, each field being assigned at least one electric motor driving the associated tangential belt and deflecting means for the tangential belt, characterized in that the number of work units (4) in each of the fields takes into account the work required for this number of work units and an allowable belt stretch are set such that the tangential belts (10, 11, 10 ', 11', 10 '', 11 '', 33, 37) have a width between 7 and 15 mm and a thickness between 2 and 2.7 mm exhibit.

2. Tangential belt drive according to claim 1, characterized gekenn¬ characterized in that the support elongation of the individual Tangen¬ tialriemen is limited to 0.6% to 1.5%.

3. Tangential belt drive according to claim 1 or 2, characterized in that the tangential belts of adjacent fields are guided over at least one common Umlenkrollen¬ element, the deflection rollers (15, 20; 16, 21; 27, 29) rotatably coupled or can be coupled.

4. Tangential belt drive according to one of claims 1 to

3, characterized in that the deflecting roller elements are each arranged between two adjacent work units (4).

5. Tangential belt drive according to one of claims 1 to

4, characterized in that the tangential belts (10, 11, 10 ', 11', 10 * ', 11'', 33, 37) run directly against whorls (8) of the working units (4).

6. Tangential belt drive according to one of claims 1 to

5, characterized in that the electric motors (19, 23, 31) of all fields are connected to a common speed control.

7. Tangential belt drive according to one of claims 1 to

6, characterized in that the fields are delimited by four deflecting rollers (14, 15, 16, 17;) in a two-row arrangement of the working units (4.) and the associated electric motors (19) are at least approximately in the middle between the two rows ( 2,3) are arranged.

8. Tangential belt drive according to one of claims 1 to

7, characterized in that in a two-row arrangement of the working units (4) the whorls [St of the working units on the side of the tangential belt (10, 11, 10 ', 11', 10- ', 11 ¹ ', facing away from the longitudinal center of the field, 33, 37) and the are arranged on the side of the tangential belt facing the longitudinal center.

9. Tangential belt drive according to one of claims 1 to

8, characterized in that the number of work aggregates (4) in a field is between 80 and 150 work aggregates.