EP3524716B1 - Double-sided ring spinning machine with stretching unit - Google Patents

Description

The invention relates to a double-sided ring spinning machine with drafting devices on each side of the machine, which have several drafting device bottom rollers arranged one behind the other in the running direction of a sliver and rotating at different speeds, which can be acted upon by drive devices arranged at the machine end and at least one additional auxiliary drive device, the drafting devices each being part of a work station. several of which are arranged side by side on each side of the machine and the auxiliary drive device is designed in such a way that it can be switched into the ring spinning machine without increasing the division of the work stations of the ring spinning machine or without one of the work stations having to be omitted.

In modern ring spinning machines, which are often equipped with a thousand or more work stations and in which the lower rollers of the drafting system are correspondingly long, the problem that the lower rollers of the drafting system twist differently under the load of the applied torque and the different rotational resistances that are acting on them is known to occur.

The length of the bottom rollers in the drafting system where this problem occurs more frequently depends on various factors, such as the roller diameter, the bearing friction, the inhibition caused by pulled aprons, etc. Although these different torsions have hardly any negative effects during normal running of the drafting units, they often lead to drafting errors when the lower rollers of the drafting unit are accelerated and/or decelerated, as is the case, for example, when the drafting units are started up and stopped. This means that depending on whether the torsion of a drafting system bottom roller is leading or trailing, thin or thick points result in the yarn, which can lead to quality losses or even thread breakages in the yarn produced.

Various devices have therefore already been proposed in the past, with which different torsions in the lower rollers of a drafting system of great length are to be prevented or at least reduced to a harmless amount. In the DE 26 41 434 A1 various embodiments of such devices are described, for example.

In a first embodiment, it is proposed, for example, to equip the drafting system of a ring spinning machine with a drafting system drive on one side and with an auxiliary gear on the side of the ring spinning machine opposite the drafting system drive equip. The auxiliary gear is intended to ensure that the angular positions of the bottom rollers of the drafting system are maintained even when the drafting system is starting up, running out or standing still.

With such a construction, however, it must be ensured that a change in the draft ratios in the main gear of the drafting system, such as a change in the yarn count, is also made accordingly in the auxiliary gear. This not only leads to additional work, but also represents a dangerous source of errors that can lead to significant damage to the drafting system.

In a further exemplary embodiment, it is proposed to install auxiliary motors on the side of the lower drafting system rollers opposite the drafting system drive, instead of an auxiliary gear unit, through which torques can be introduced into the lower drafting system rollers.

In connection with ring spinning machines of very great length, it is also proposed in a third exemplary embodiment to arrange a further additional drafting system drive approximately in the longitudinal center of the drafting systems. However, such an arrangement of a drafting system drive in the area of the longitudinal center of the drafting system lower rollers has the not inconsiderable disadvantage that the sequence of division of the work stations is interrupted at this point. This means that with such an embodiment, not only is the structure of the ring spinning machine significantly more complicated, but other measures, some of which are very complex and expensive, are necessary, especially if devices are provided for automatically changing the roving bobbins and/or the spinning bobbins.

Also in the DE 100 40 420 A1 various embodiments of drafting arrangements for ring spinning machines are described.

In all embodiments, at least one of the lower drafting rollers is driven at more than two drive points along its length. This means that in these known drafting arrangement arrangements, a drafting system main drive at the end of the drafting system lower rollers is expressly dispensed with, the drafting system lower rollers are driven exclusively by several individual drives distributed with respect to the drafting system lower rollers.

The one in the DE 100 40 420 A1 However, the embodiments described have not proven themselves and accordingly have not found their way into practice.

This statement also applies, at least in part, to those made by the WO 2007/057148 A2 known embodiments of ring spinning machine drafting systems. In the WO 2007/057148 A2 describes, for example, a ring spinning machine with long drafting systems. The drafting units have both a drafting unit main drive device arranged at the end of the machine and several auxiliary drive devices arranged distributed over the length of the lower drafting rollers. The auxiliary drive devices or their transmission elements have such a narrow design that it is possible to let the auxiliary drive devices engage between the work stations on the drafting rollers without increasing the spacing between the work stations of the ring spinning machine or without having to eliminate jobs.

The one in the WO 2007/057148 A2 The exemplary embodiments disclosed for narrow auxiliary drive devices that can be positioned between the work stations of a ring spinning machine are, however, very schematic and can hardly be understood in practice by a person skilled in the art. There are also no known ring spinning machines whose drafting systems are in the WO 2007/057148 A2 have indicated auxiliary drive devices.

the WO 2012/004779 A2 discloses a double-sided ring spinning machine with an auxiliary drive device for the bottom rollers of the drafting system. The auxiliary drive device has an electric motor drive, a main gearbox and two distributor gears, one of the distributor gears being assigned to a drafting system lower roller of the drafting units arranged on one side of the machine and the other distributor gear being assigned to a drafting system lower roller of the drafting units arranged on the other side of the machine.

Proceeding from the prior art described above, the object of the invention is to create a ring spinning machine equipped with long drafting units, the bottom rollers of which are driven in such a way that torsion of the bottom rollers of the drafting unit is largely avoided, with an additional auxiliary drive device being designed and positioned in such a way that neither the Division of the jobs of the ring spinning machine are increased nor one of the jobs must be omitted.

This object is achieved according to the invention by a double-sided ring spinning machine with drafting devices on each side of the machine, which have several drafting device lower rollers arranged one behind the other in the running direction of a sliver and rotating at different speeds. The bottom rollers of the drafting arrangement can be acted upon by drive devices arranged at the end of the machine and at least one additional auxiliary drive device. Several work stations are arranged next to each other on each side of the machine. The drafting systems are each part of a job. According to the invention, the auxiliary drive device has an electric motor drive, a main gearbox and two transfer gearboxes. One of the distributor gears is a drafting system lower roller of the drafting systems arranged on one side of the machine and the another transfer case is assigned to a drafting system bottom roller of the drafting systems arranged on the other side of the machine. The transfer gears are each equipped with a fastening device, which is connected to the respective bottom roller of the drafting system at a bearing point in a first intermediate space between two work stations for mounting the transfer gears. Furthermore, the transfer gears are each connected to a drive point at a second intermediate space between two work points with the respective lower roller of the drafting system in order to transmit a torque.

Advantageous configurations of the invention are the subject matter of the dependent claims.

According to the invention, the storage function and the torque transmission function are separated from one another. The drive point is designed in such a way that a torque is transmitted. The storage function can be completely or partially omitted at this point due to the existing fastening device. As a result, the connection of the transfer case with the lower roller of the drafting system and the drive point can be made correspondingly narrow. The storage function is taken over by the fastening device. The fastening device ensures that the auxiliary drive device is securely fixed during the spinning operation both in the radial and in the axial direction. The fastening device does not have to transmit any torque, but is only used for storage. As a result, the connection between the fastening device and the bottom roller of the drafting system can be made correspondingly narrow at the bearing point.

The design and arrangement of the auxiliary drive device according to the invention not only ensures largely torsion-free operation of the long drafting system lower rollers of the drafting systems of the ring spinning machine and thus ensures that the operation of the work stations of the ring spinning machine is in no way negatively influenced during the spinning process, but also the Due to its compact design, the auxiliary drive device can also be easily inserted at almost any point in the drafting systems of a ring spinning machine. The compact design is also achieved in that the drive and the main gear are used jointly for both sides of the machine.

It is of course also possible to switch several auxiliary drive devices into the drafting units of a ring spinning machine at the same time, whereby the use of a plurality of auxiliary drive devices can, for example, reduce the diameter of the lower rollers of the drafting unit without the risk of increased torsion with its disadvantageous consequences.

The compact design of the auxiliary drive device also ensures that, even when the auxiliary drive device is switched on, the spindle pitch of the ring spinning machine does not have to be increased, nor do jobs have to be eliminated.

According to the invention, the auxiliary drive device is connected to one of the bottom rollers of the drafting system via transfer gears and secured by means of a fastening device so that not only drive energy can be transmitted at the drive point, but that the reaction moment of the transmitted energy is also reliably absorbed.

According to a preferred embodiment of the present invention, the respective fastening device is connected to the respective lower roller of the drafting system at a further bearing point at a third intermediate space between two work points for bearing the distributor gears. The distribution of the bearing forces over two bearing points accommodates the narrow design of the connection between the fastening device and the bottom roller of the drafting system. The drive point is preferably located in the middle between the two bearing points. The bearing points are thus arranged symmetrically to the drive point. This creates both optimal storage and optimal torque transmission. The drive point is reliably relieved of bearing forces.

The auxiliary drive device is preferably connected to the middle lower rollers of the drafting systems of a ring spinning machine. The connection of the auxiliary drive device to the middle bottom rollers of the drafting system is particularly recommended because the middle bottom rollers move drafting system aprons, which have to overcome relatively high resistance when sliding over the deflection edges of the apron cages, which leads to a relatively high torsional load on the affected drafting system lower rollers.

However, it can also be advisable to connect an auxiliary drive device to one of the other bottom rollers of a ring spinning machine drafting system. In an alternative embodiment, an auxiliary drive device can also be connected, for example, to the lower inlet rollers or to the lower outlet rollers of the drafting systems of a ring spinning machine.

Furthermore, it is of course also possible to connect an auxiliary drive device to each of the drafting system lower rollers of the drafting systems of a ring spinning machine. The simultaneous use of several auxiliary drive devices per drafting system lower roller can also be very advantageous.

In a further advantageous embodiment, it is also proposed that the main transmission and the transfer case are each connected via a universal joint, which is preferably covered by a housing. The arrangement of such a universal joint between the main transmission and the transfer case has the particular advantage that, when changing the transfer case, no complex alignment of the transfer case with respect to the main transmission is necessary. The associated housing also prevents the universal joint from being damaged at an early stage by the environmental conditions that are common in spinning mills. This means that the housing reliably protects the universal joint from flying and/or dust, which has a very advantageous effect both on the functionality and on the service life of the universal joint.

Since the speed of such drafting system lower rollers supported by an auxiliary drive device is specified by the main drive device of the drafting system and the speeds of the various drafting system lower rollers are usually very different, it is necessary for the transfer gears to work with the correct reduction ratio.

In an advantageous embodiment, the distributor gears therefore each have a gear reduction which is matched to the speed of the associated lower roller of the drafting system. By selecting a transfer case with a suitable gear reduction, it is thus easily possible to adapt the auxiliary drive device exactly to the speed of the drafting system lower roller to be supported.

The respective bottom roller of the drafting system can have a shaft pinion at the drive point for the transmission of the torque from the transfer case to the respective bottom roller of the drafting system. The shaft pinion can be designed as a gear worked into the bottom roller of the drafting system, into which a gear of the transfer case engages. The torque can be transmitted without any problems. However, there is no axial support at the drive point. A radial support occurs only to a limited extent. According to the invention, the axial and radial support is provided by the fastening device.

In an advantageous embodiment, it is also provided that the fastening device for the auxiliary drive device on the housing of the transfer case has fixed locking elements, the end each with a bearing support for connecting the Fastening device are equipped with the respective drafting system lower roller at the bearing point. The bearing supports are preferably each equipped with a rotary bearing, with either sliding bearings or roller bearings being able to be used as rotary bearings. Via the locking elements and the bearing supports of the fastening device, the transfer case is in each case reliably connected to the relevant drafting system bottom roller of the drafting system.

The ring spinning machine preferably has punches on which the bottom rollers of the drafting system are mounted, and the auxiliary drive device is preferably arranged between two adjacent punches.

Furthermore, the fastening device is equipped with tension and/or pressure elements, via which the fastening device is connected to the adjacent punches. This means that the tension and/or pressure elements reliably prevent forces from being introduced onto the fastening device, which could ultimately lead to damage to the transfer case. The tension and/or pressure elements preferably absorb axial forces.

In an advantageous embodiment, it is also provided that the electromotive drive of the auxiliary drive device is designed as an asynchronous motor. Asynchronous motors of this type are tried and tested drive units that are widely used in the textile machine industry and can also be purchased relatively cheaply as series components from specialist dealers.

The invention is explained in more detail below with reference to an exemplary embodiment illustrated in the drawings.

Fig. 1

in Seitenansicht eine doppelseitige Ringspinnmaschine, mit langen Streckwerken, bei denen wenigstens eine der Streckwerksunterwalzen über eine Hilfsantriebseinrichtung verfügt,

Fig. 2

eine schematische Draufsicht auf die Streckwerke einer doppelseitigen Ringspinnmaschine, wobei an die Mittelunterwalze der Streckwerke eine Hilfsantriebseinrichtung angeschlossen ist,

Fig. 3

eine Draufsicht auf eine erfindungsgemäß ausgebildete Hilfsantriebseinrichtung, deren Verteilergetriebe an die Mittelunterwalzen der Streckwerke einer Ringspinnmaschine angeschlossen sind,

Fig. 4

eine perspektivische Ansicht der in Fig. 3 dargestellten, erfindungsgemäß ausgebildeten Hilfsantriebseinrichtung.

It shows:

1

a side view of a double-sided ring spinning machine with long drafting units, in which at least one of the bottom rollers of the drafting unit has an auxiliary drive device,

2

a schematic plan view of the drafting units of a double-sided ring spinning machine, with an auxiliary drive device being connected to the middle bottom roller of the drafting units,

3

a top view of an auxiliary drive device designed according to the invention, the transfer case of which is connected to the middle lower rollers of the drafting systems of a ring spinning machine,

4

a perspective view of in 3 illustrated, according to the invention designed auxiliary drive device.

the 1 shows a side view of a double-sided ring spinning machine 1, which is equipped with a plurality of identical work stations 2 in the area of its long machine sides.

The workstations 2 each have, as is known, stationary devices, for example a drafting system 3 and a spindle rail 4, and devices mounted for vertical displacement, such as a ring rail 11, a balloon limiting ring 12 and a yarn guide 13.

The jobs 2 of such ring spinning machines 1 are usually also equipped with a gate 14 on which roving bobbins 15, so-called roving bobbins, hang, which are processed on the jobs 2 to form spinning cops. The sleeves of the spinning bobbins rotate during the spinning process with spindles 5 arranged on the spindle rail 4. As can be seen, such ring spinning machines 1 also have so-called bobbin changing devices 6, which each have gripping devices 7 arranged on a gripper beam 8, with which finished spinning bobbins can be moved to a machine-long Transport device 9 and fresh empty tubes on the spindles 5 of the spindle rail 4 can be transferred.

As is known, the ring spinning machine 1 is also equipped with a suction channel 16 on each of the longitudinal sides of the machine, on which so-called punches 10 are fastened. On the punches 10, the drafting system lower rollers 21, 22, 23 of a drafting system 3 are mounted on bearing slides 17.

In the present embodiment, the drafting system 3, as in particular based on the 2 clarifies three drafting system lower rollers, namely the input lower roller 21, the middle lower roller 22 and the output lower roller 23. The associated drafting system top rollers 24 are, as usual, mounted in a support and loading arm 19, which is fixed so that it can move to a limited extent on a bearing tube 20, which in turn is connected to the punches 10 is fixed. Two parallel supporting and stabilizing tubes 25 running in the longitudinal direction of the machine also extend through the punches 9.

the 2 shows a very schematic plan view of the drafting units 3 of a double-sided ring spinning machine 1.

Such double-sided ring spinning machines 1 each have a drafting system 3 arranged side by side in the region of each of their two long machine sides. The drafting units 3 have an entry bottom roller 21, a middle bottom roller 22 and an exit bottom roller 23 on each longitudinal side of the machine. The drafting unit bottom rollers 21, 22, 23 are, as usual, over (in 2 not shown) bearing carriage 17 rotatably mounted on punches 10, which are arranged along the ring spinning machines 1 at regular intervals. The rotary drive of the bottom rollers 21, 22, 23 of the drafting system takes place by means of a main drive 26 arranged at the start of the machine and a synchronous drive 27 arranged on the opposite machine end of the ring spinning machines 1. As in 2 further indicated, in the central region M of the ring spinning machine 1 with the length L, an auxiliary drive device 28 designed according to the invention is also installed, which is connected to the central lower rollers 22 of the drafting units 3 in the present exemplary embodiment.

As indicated, the auxiliary drive device 28, which is based on the Figures 3 and 4 is described in detail, an electric motor drive 29, a main gear 30 and two transfer cases 31. The transfer gears 31 are each connected to bearing points 38 of the middle lower rollers 22 of the drafting units 3 by means of a fastening device 33 .

the 3 shows a plan view and on a larger scale of an auxiliary drive device 28 designed according to the invention and switched on between two punches 10 of a ring spinning machine 1.

As can be seen, the auxiliary drive device 28 has an electric motor drive 29, preferably an asynchronous motor, which is connected to a main gear 30, which is preferably designed as a toothed gear. Two transfer gears 31 are connected to the main gear 30, each via a universal joint 32, which in turn are each connected to one of the middle lower rollers 22 of the drafting units 3 at the drive point 18. That is to say, the toothed wheel gears of the transfer case 31 each act on a correspondingly designed toothed wheel arranged on the central lower rollers 22 and transmit it a torque generated by the auxiliary drive device 28 acts on the middle lower rollers 22.

As can be seen, a fastening device 33 is installed on the housing 34 of the transfer case 31, the locking elements 35 of which are each equipped with a bearing support 36 at the end. Rotational bearings, either plain bearings or roller bearings, are arranged in the bearing supports 36, in each of which the associated middle lower roller 22 of the drafting system 3 rotates. The rotary bearings thus form the bearing points 38

In order to be able to compensate for axial moments occurring during operation, the fastening devices 33 are also equipped with tension and/or pressure elements 37, via which the fastening devices 33 are connected to the adjacent punches 10.

the 4 shows a perspective view of an auxiliary drive device 28 designed according to the invention.

How from the 3 known, the auxiliary drive device 28 has an electric motor drive 29, preferably an asynchronous motor. The electric motor drive 29 is connected to a main transmission 30 which in turn is connected to two transfer cases 31 via universal joints 32 . The two distributor gears 31 are each connected to the middle lower roller 22 of the drafting units 3 of the ring spinning machine 1 . This means that the torque applied by the electric motor drive 29 is transmitted to the middle lower rollers 22 of the drafting units 3 via the main gear 30 and the transfer gear 31 .

In order to protect the transfer case 31 and thus the auxiliary drive device 28 as a whole from harmful axial forces, the transfer cases 31 are also each equipped with a fastening device 33 . This means that locking elements 35 are arranged on the housing 34 of the transfer case 31, which in turn each have a bearing support 36 at the end, in which rotary bearings are arranged. The middle lower rollers 22 of the respectively associated drafting system 3 are supported in the rotary bearings. To compensate for axial moments, the fastening devices 33 are also equipped with tension and/or pressure elements 37, via which the fastening devices 33 are connected to the adjacent punches 10. <b>Reference List</b> 1 ring spinning machine 22 center bottom roller 2 place of work 23 exit bottom roller 3 drafting system 24 drafting system top roller 4 spindle bank 25 Support and stabilization tube 5 spindle 26 main drive 6 bobbin changing device 27 synchronous drive 7 gripping device 28 Auxiliary propulsion device 8th gripper bar 29 electromotive drive 9 transport device 30 main gear 10 punch 31 transfer case 11 ring bank 32 universal joint 12 balloon constriction ring 33 fastening device 13 thread guide 34 Housing 14 gate 35 locking element 15 roving spool 36 bearing support 16 suction channel 37 Tension and/or pressure element 17 storage slide 38 storage place 18 drive point 19 Low-carrying and low-load M Central area of the drafting systems 20 stock tube ring spinning machine 21 input bottom roller L length of the machine

Claims (10)

1. Double-sided ring spinning machine (1) with drafting systems (3) on each machine side, which have several drafting system bottom rollers (21, 22, 23) rotating at different speeds positioned one after the other in the running direction of a sliver which can be acted upon by drive devices (26, 27) positioned at the machine ends as well as at least one additional auxiliary drive device (28), whereby the drafting systems (3) are each part of a workstation (2), of which several are positioned next to each other at each side of the machine,

   whereby the auxiliary drive device (28) has an electromotive drive (29), a main transmission (30) and two distribution transmissions (31), in which case one of the distribution transmissions (31) is assigned to a drafting system bottom roller (21, 22, 23) of the drafting system (3) positioned on one machine side and the other distribution transmission (31) to a drafting system bottom roller (21, 22, 23) of the drafting system (3) positioned on the other machine side,

   characterised in that,

   that the distribution transmissions (31) are each fitted with fastening devices (33), which are connected to the relevant drafting system bottom roller (21, 22, 23) at a bearing position (38) at an initial empty space between two workstations for bearing mounting of the distribution transmissions (31), and that the distribution transmissions (31) are each connected on a drive position (18) at a second empty space between two workstations (2) with the relevant drafting system bottom roller (21, 22, 23) for transmission of a torque.
2. Ring spinning machine (1) according to claim 1, characterised in that the relevant fastening device (33) is connected to another bearing position (38) at a third empty space between two workstations (2) for bearing mounting of the distribution transmission (31) with the relevant drafting system bottom roller (21, 22, 23).
3. Ring spinning machine (1) according to claim 2, characterised in that the drive position (18) is positioned midway between the two bearing positions (38).
4. Ring spinning machine (1) according to one of the previous claims, characterised in that the main transmission (30) is connected with the distribution transmissions (31) via a universal joint (32), which is preferably covered by a housing.
5. Ring spinning machine (1) according to one of the preceding claims, characterised in that the distribution transmissions (31) each have a transmission reduction which is coordinated with the speed of the associated drafting system bottom roller (21, 22, 23).
6. Ring spinning machine (1) according to one of the preceding claims, characterised in that the relevant drafting system bottom roller (21, 22, 23) at the drive position (18) has a shaft pinion for transmitting the torque from the distribution transmission (31) to the relevant drafting system bottom roller.
7. Ring spinning machine (1) according to one of the preceding claims, characterised in that the fastening device (33) has specified locking elements (35) at the housing (34) of the distribution transmission (31), which are each fitted at the end at the bearing position (38) with a bearing support (36) for connecting the fastening device (33) with the relevant drafting system bottom roller (21, 22, 23).
8. Ring spinning machine (1) according to claim 7, characterised in that a rotation bearing is positioned in the bearing support (36).
9. Ring spinning machine (1) according to one of the preceding claims, characterised in that the ring spinning machine (1) has dies (10) on which the drafting system bottom rollers (21, 22, 23) are bearing mounted and that the auxiliary drive device (28) is positioned between two neighbouring dies.
10. Ring spinning machine (1) according to claim 9, characterised in that the fastening devices (33) are also fitted with tensioning and/or pressure elements (37), via which the fastening devices (33) are connected to the neighbouring dies (10).

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