EP0202253B1 - Tangential belt control for spinning loom or twister - Google Patents

Abstract

Tangential belt control for a plurality of similar working units (4) arranged on at least one line, side to side, in a machine (1) for the production of twisted yarn. Along said belt control (10, 11), the working units are arranged in groups having approximatively the same number of units (4), for each group there being provided at least one electric motor (19, 23) and guiding means (14, 17, 20, 21) acting on the belts (10, 11). To reduce the power losses of such control, there is provided to substantially reduce both the width and the thickness of the tangential belt (10, 11), particularly by selecting its length between 7 and 14 mm and its width between 2 and 2,7 mm. This is possible by selecting the number of working units (4) of one group so that it is in relation with the power absorbed and with the admissible elongation of the belt. In a further development of the invention, the tangential belts (10, 11) of groups of adjacent units are guided by pulleys (15, 16, 20, 21) which are rigidly coupled together.

Description

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

Tangential belts of the type mentioned at the outset 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. In these machines, the working units such as spindles, rotors or opening rollers or the like are arranged next to one another in one or two rows and driven by tangential belts which 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 around the whorls and the necessary pressure rollers, the large number of work units causes considerable energy consumption and belt wear due to flexing work. 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. Because the number of work units, for example in a ring machine. 1,000 and more can be used in practice tangential belts with a width of 35 to 38 mm and a thickness of 3 to 3.7 mm.

In order to reduce the stress on a tangential belt running through the entire machine, it is also known (DE-OS 3301811) to arrange at least one electric motor at both ends 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 by means of a driven friction disk at least one further point between the machine ends. 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 1141571), 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, each of which is 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 design, the tangential belt drives intermediate rollers, which in turn drive the work units via endless straps. This 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 tangential belts (10, 11, 10 ', 11', 10 ", 11", 33, 37) have a width between 7 mm and 15 mm and a thickness of 2 mm to 2.7 mm , and that the number of work units (4) per field is determined taking into account the drive power that can be transmitted by the tangential belt with a permissible belt stretch.

By using tangential belts dimensioned in this way, the loss of power, in particular due to flexing work, is substantially reduced, so that overall a lower drive power is required. The stress on the individual tangential belts is correspondingly lower. Although an additional effort is required due to the increased number of motors, the controls and brackets or the like, this is more than compensated for by the advantages that can be achieved. Due to the lower energy losses in the tangential belts, the overall energy requirement is reduced. In addition, it is found that there is a price advantage when using a plurality of smaller motors, all of which have the same size, since these smaller motors are manufactured in larger numbers, so that several smaller motors are also cheaper than a single motor with the same high 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 by this measure, while in addition the tolerances resulting from belt expansions with respect to the rotational speeds of the individual work units keep within tolerable limits.

In another embodiment of the invention, it is provided that the tangential belts of adjacent fields are guided over at least one common deflection roller element, the deflection rollers of which are coupled or can be coupled in a rotationally fixed manner. This will allow some synchronization of speeds between the receive individual fields, which is particularly advantageous when the drive is switched off or fails due to a power failure, since then all working units run largely evenly.

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 transmission losses, 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 deflecting rollers can be dimensioned such that they can be arranged between adjacent work units without changing the machine division. 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 tangential belts of the adjacent fields, which run correspondingly offset in height, 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 no additional burdens are also expected of the work units.

• Fig. 1 zeigt eine Teilansicht einer Maschine mit zwei parallelen Reihen gleichartiger Arbeitsaggregate ;
• Fig. 2 zeigt eine Teilansicht einer Maschine mit einer Reihe gleichartiger Arbeitselemente ;
• Fig. 3 zeigt eine Teilansicht einer Maschine mit zwei parallelen Reihen gleichartiger oder in jeder Reihe gleichartiger Arbeitsaggregate ;
• Fig. 4 zeigt eine Seitenansicht eines Umlenkelementes und zweier als Spindeln ausgebildeter Arbeitsaggregate ;
• Fig. 5 zeigt eine Ansicht von oben auf den in Fig. 4 dargestellten Teil der Maschine ;
• Fig. 6 und 7 Querschnitte durch die Spindelbank einer Ringspinnmaschine.

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 units;
• 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 and 7 cross sections through the spindle bank of a ring spinning machine.

In the first exemplary embodiment according to FIG. 1, the machine, designated overall by 1, has two parallel rows 2 and 3, working units 4 of the same type which are driven at the same speed and of the same type. These working units 4 can be spindles, for example, with FIG. 1 then being able to 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 apply 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 driven by a first, endless tangential belt 10 and each further group of twelve working units 4 of both rows 2 and 3 are each driven by further tangential belts 11 and so on. 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 guided and looped through deflection rollers 20 and 21 coaxial to the deflection rollers 15, 16 and two further deflection rollers that are no longer visible 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 being able to be arranged along the machine and a larger number of tangential belts being present can be. For the sake of simplicity, 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, 1,000 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 mounted in bearings 25 which are connected to the spindle bench 7 by nuts 26.

Fig. 2 shows a machine 1 'with only one row 2 of work units 4. This can be the spindles of a one-sided spinning machine or to drive the rotors on one side of an open-end spinning machine. Here, too, a first group of twelve work units 4 of the single 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 belts can be driven by electric motors 19, 23, on each shaft of which a drive roller 18 or 22 is seated, which is wrapped by the relevant tangential belt 10 'or 11'.

Each tangential belt 10 ', 11' runs over three deflection rollers 26, 27 28 and 29, 30 (the third is no longer visible), here too the deflection rollers 27 and 29 arranged one above the other are rotatably connected to one another and a two adjacent tangential belt 10 ' and 11 'form a common deflecting roller element.

. 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 driven individually by a tangential belt 10" or 11 ", In this respect, this embodiment corresponds to a doubling of the embodiment of Figure 2. The drive of the two rows of work 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 number of work units can also be driven at a different speed than the other - this occurs, for example, if the work units in one row are rotors and the other row are opening rollers of an open-end spinning machine. 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, the guide roller, not shown, corresponding to the guide roller 27 of the first tangential belt 10 ″ and the guide roller 30, which is underneath the guide roller 27 and connected to it in a rotationally fixed manner, and the guide roller 30. Further tangential belts are arranged and guided accordingly.

Row 3 of the working units shows the end of such a row: a last drive motor 31 drives, via its drive pulley 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.

Because only about 80 to 150 spindles are driven by a tangential belt, the tangential belts can be chosen to be much thinner and narrower than a single tangential belt that drives all work units of a machine or all work 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 previously used.

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, as are known, for example, under the trade names «Kevlar - or« Aramid ». For example, the tangential belt. Polyester, this results in a contact elongation of 1 to 1.5%. With a mixture of the aforementioned type, there is an elongation of contact between 0.3 and 1%.

As a result of the small dimensions of these tangential belts, as shown in FIGS. 6 and 7, at least one further, similar tangential belt 10 a or 11 a can be accommodated along the course of a tangential belt for reserve in the machine, preferably in the spindle bank 7. For protection, this reserve belt can be surrounded by a plastic sheath 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 placed on it without great delay. Depending on 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 that have common deflection elements and therefore run synchronously have a common power supply. The electric motors are three-phase motors which 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. In addition, 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 independently operable control devices 41 and 41 ', of which the control device 41 controls the motors 19, 23 ... via a line 42, the tangential belts 10 ", 11" and the working elements via these Drive 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 (9)

1. Tangential belt control for a plurality of similar working units of a machine for producing twisted or doubled threads, the working units being arranged in at least one row and subdivided into arrays of at least approximately equal numbers of working units, each array of working units being commonly driven via an endless tangential belt and comprising guide means and at least one electric motor driving the said tangential belt, characterized in that the tangential belts (10, 11, 10', 11', 10". 11", 33.37) have a width of between 7 mm and 15 mm and a thickness of 2 mm to 2.7 mm and that the number of working units (4) in each array is determined with regard to the drive power which the tangential belt is capable of transmitting within the limits of an admissible elongation of the belt.

2. Tangential belt control according to claim 1, characterized in that the contact elongation of the individual tangential belts is limited to 0.6 % to 1.5 %.

3. Tangential belt control according to claim 1 or claim 2, characterized in that the tangential belts of neighbouring arrays are guided over at least one common guide pulley element whose guide pulleys (15, 20 ; 16, 21 ; 27, 29) are, or can be, coupled with each other for common rotation.

4. Tangential belt control according to any of claims 1 to 3, characterized in that each of the guide pulley elements is arranged between two neighbouring working units (4).

5. Tangential belt control according to any of claims 1 to 4, characterized in that the tangential belts (10, 11, 10', 11', 10", 11", 33, 37) run up directly against whorls (8) of the working units (4).

6. Tangential belt control according to any of claims 1 to 5, characterized in that the electric motors (19, 23, 31) of all arrays are connected to a common speed control.

7. Tangential belt control according to any of claims 1 to 6, characterized in that when the working units (4) are arranged in two rows, the arrays are defined by four guide pulleys (14, 15, 16, 17) and the respective electric motors (19) are arranged approximately centrally between the two rows (2, 3).

8. Tangential belt control according to any of claims 1 to 7, characterized in that when the working units (4) are arranged in two rows, the whorls (8) of the working units are arranged on the side of the tangential belt (10, 11, 10', 11', 10", 11", 33, 37) opposite the longitudinal centre line of the array, while the guide pulley elements are arranged on the side of the tangential belt facing the longitudinal centre line.

9. Tangential belt control according to any of claims 1 to 8, characterized in that the number of working units (4) of each array is between 80 and 150.

Images