JP7136714B2 - Double row ring spinning machine with draft device - Google Patents

Description

The present invention is a double-row ring spinning machine, which is provided with a drafting device provided on the side of each machine. It has a plurality of drafting device bottom rollers rotating at different speeds, which can be driven by a drive arranged at the end of the machine and by at least one additional auxiliary drive. , and the drafting device is part of a plurality of working units arranged side by side on each side of the machine, and the auxiliary drive device does not increase the pitch of the working unit of the ring spinning machine, or multiple The present invention relates to a double-row ring spinning machine which is formed so that it can be loaded into the ring spinning machine without having to omit one of the working units.

Modern ring spinning machines, which often have more than 1000 working units and correspondingly large lengths of the draft bottom rollers of the drafts, have, as is well known, a draft bottom roller. The problem is that the rollers twist to different degrees under the action of the applied torque load and different torsional resistance.

The length of the drafter bottom roller at which this problem becomes noticeable depends on different factors, such as roller diameter, bearing friction, damping by the pulled apron, and the like. Different degrees of this torsion have little detrimental effect during normal operation of the drafting device, but lead to draft defects during acceleration and/or deceleration of the drafting device bottom roller, e.g. starting and stopping the drafting device. I often end up. That is, depending on whether one drafter bottom roller twists first or last, the thread will have a thin spot or a thick spot. This leads to quality loss or even yarn breakage during yarn production.

Various devices have therefore already been proposed which prevent, or at least harmlessly reduce, twisting to different degrees in the bottom rollers of drafting devices of great length. DE 26 41 434 A1 (DE 26 41 434 A1), for example, describes various embodiments of such a device.

In the first embodiment, for example, it is proposed to provide a draft device drive on one side of the draft device of the ring spinning frame and to provide an auxiliary transmission device on the side of the ring spinning machine opposite to the draft device drive. ing. This auxiliary transmission ensures that the angular position of the drafting device bottom roller is maintained even when the drafting device is started, stopped or at rest.

However, in such a design it must be ensured that a change in the draft ratio in the main transmission of the drafting device, for example when the yarn count is changed, also takes place in the auxiliary transmission accordingly. Not only does this require a lot of additional work, but it also represents a dangerous source of failure that can lead to significant damage to the drafting system.

In another embodiment, it is proposed to install on the side of the drafting device bottom roller facing away from the drafting device drive, instead of the auxiliary transmission, an auxiliary motor capable of introducing a torque into the drafting device bottom roller. there is

In connection with ring spinning machines of very great length, it is also proposed in a third embodiment to arrange a further additional drafting device drive approximately in the longitudinal center of the drafting device. However, such an arrangement of the drafting device drive in the longitudinally central region of the drafting device bottom roller has the significant disadvantage that the pitch sequence of the working unit is interrupted at this point. Thus, such an embodiment not only significantly complicates the structure of the ring spinning machine, but also proposes a device for automatically changing the roving bobbins and/or the spinning cops in particular. In some cases, further expensive measures are also required, which are partly quite labor intensive.

DE 100 40 420 A1 (DE 100 40 420 A1) also describes different embodiments of a drafting device unit for ring spinning machines.

In all embodiments, at least one drafter bottom roller of the plurality of drafter bottom rollers is driven at more than two drive points along its length. Thus, in this known drafting device unit, the drafting device main drive is clearly omitted at the end of the drafting device bottom roller, and the drive of the drafting device bottom roller is arranged distributed with respect to the drafting device bottom roller. It is only done by a plurality of individual drives.

However, the embodiment described in DE 100 40 420 A1 was not useful and correspondingly not accepted in practice.

The above also applies at least partially to the embodiment of the drafting device for ring spinning machines known from WO 2007/057148 A2. The same number describes, for example, a ring spinning machine with a long drafting device. The drafting device has not only one drafting device main drive arranged at the machine end, but also a plurality of auxiliary drives arranged distributed over the length of the draft bottom roller. These auxiliary drives or their transmissions allow the auxiliary drives to act on the drafting device between the working units without the need to increase the pitch distance of the working units of the ring spinning machine or to omit the working units. It has a narrow configuration to the extent that it becomes possible.

However, the embodiment disclosed in WO 2007/057148 for a narrow auxiliary drive positionable between the working units of a ring spinning machine is very schematic and in fact little understood by those skilled in the art. It's not possible. Also, a ring spinning machine having a drafting device with an auxiliary drive as described in the same number has not been known so far.

On the basis of the above-mentioned prior art, the object of the present invention is a ring spinning machine with a long drafting device having a drafting device bottom roller driven in such a way that torsion is largely avoided. To provide a ring spinning machine in which an additional auxiliary driving device is formed and positioned so that there is no need to increase the pitch of the working units or omit one of a plurality of working units. That is.

According to the invention, this task is solved by a double-row ring spinning machine with drafting devices arranged on the side of each machine, which are arranged one behind the other in the direction of travel of the slivers. A solution is provided by a double-row ring spinning machine having a plurality of drafting device bottom rollers, each rotating at a different speed, arranged in parallel with each other. The drafting device bottom roller can be driven by a drive arranged at the machine end and by at least one additional auxiliary drive. A plurality of work units are arranged side by side on each side of the machine. The drafting devices are each part of a working unit. According to the invention, the auxiliary drive has an electric motor drive, a main transmission and two distribution transmissions. One of the distributor gears is assigned to a drafting device bottom roller of a drafting device arranged on one machine side, and the other distributor gear is assigned to the other machine side. is assigned to one drafting device bottom roller of the drafting device located in the . The distributor gears each have a fixing device, which is connected to each drafting device bottom roller at a support point in the first intermediate space between the two working units for the support of the distributor gear. It is Furthermore, a distributor transmission is connected to each drafting device bottom roller at a drive point in the second intermediate space between the two working units, respectively, for torque transmission.

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

According to the invention, this means that the function of support and the function of torque transmission are separated from each other. The drive point is designed to transmit torque. At this point, the supporting function can be completely or partially omitted due to the fixing device provided. As a result, the connection between the distributor gear, the drafting device bottom roller and the drive point can be made correspondingly narrow. The supporting function is taken over by the fixing device. This securing device ensures a positive fixation of the auxiliary drive during the spinning operation, both radially and axially. Fixtures do not need to transmit torque, they serve only for support. As a result, the connection between the fixing device and the drafting device bottom roller at the support point can be made correspondingly narrow.

The design and arrangement according to the invention of the auxiliary drive therefore makes it possible to ensure a sufficiently twist-free operation of the long drafting-unit bottom rollers of the drafting units of the ring spinning machine, and thus the ring spinning machine during the spinning process. In addition to ensuring that the operation of the working unit of the invention is never negatively affected, the auxiliary drive constructed according to the invention can be installed in virtually any area in the drafting unit of a ring spinning machine due to its compact construction. It can also be incorporated in places without problems. A compact construction is also achieved by the common use of drive and main transmission on both sides of the machine.

Of course, it is also possible to insert several auxiliary drives into the drafting device of the ring spinning machine at the same time. Through the use of a plurality of auxiliary drives, for example, a reduction in the diameter of the drafting device bottom roller can be achieved without an increased risk of twisting with adverse consequences.

Due to the compact design of the auxiliary drive, it is also ensured that there is no need to increase the spindle pitch of the ring spinning machine or to omit the working unit even when the auxiliary drive is loaded.

According to the invention, the auxiliary drive is connected to one of the plurality of drafting device bottom rollers via a distribution transmission, in which case the drive energy is transmitted at the drive point. It is fixed in position by means of a fixing device in such a way that not only is it possible to absorb the reaction torque of the transmitted energy, but also the reaction torque of the transmitted energy is reliably absorbed.

According to a preferred embodiment of the invention, each fixing device is attached to each drafting device bottom roller at another support point in the third intermediate space between the two working units for supporting the distribution gear. It is connected. The distribution of the bearing force to the two bearing points is in line with the narrow construction of the connection between the fixing device and the drafting device bottom roller. Preferably, the drive point is located in the middle between the two support points. As a result, the support point is arranged symmetrically with respect to the drive point. This provides not only optimum support but also optimum torque transmission. The load on the drive points is reliably relieved by the supporting forces.

Preferably, the auxiliary drive is connected to the intermediate bottom roller of the drafting device of the ring spinning machine. The connection of an auxiliary drive to the intermediate bottom roller of the drafting device is highly recommended, especially since the drafting device apron is moved by the intermediate bottom roller. This drafting device apron must overcome a relatively high resistance when sliding through the deflecting edge of the apron retainer. This leads to a relatively high torsional load on the drafting device bottom roller.

However, it is also advisable to connect the auxiliary drive to one of the other drafting unit bottom rollers of the ring spinning frame drafting unit. In an alternative embodiment, the auxiliary drive can be connected, for example, to the entry bottom roller or the exit bottom roller of the drafting device of the ring spinning machine.

Furthermore, it is of course also possible to connect an auxiliary drive to each of the drafting unit bottom rollers of the drafting unit of the ring spinning machine. It can also be very advantageous to use multiple auxiliary drives simultaneously for each drafter bottom roller.

Another advantageous embodiment further proposes that the main transmission and the distribution transmission are each connected via a cross joint, which is preferably covered by a housing. . Arranging such a cross joint between the main transmission and the distribution transmission has the advantage that, especially when the distribution transmission is replaced, no complicated orientation adjustment of the distribution transmission with respect to the main transmission is required. have. Furthermore, the attached housing prevents the cross joints from prematurely failing due to the environmental conditions typical in spinning mills. The housing thus reliably protects the cross joint against airborne fibers and/or dust. This has a very positive effect on both the functionality and the service life of the cross joint.

Since the speed of rotation of such drafting device bottom rollers assisted by the auxiliary drive is set by the main drive of the drafting device, and the speed of rotation of different drafting device bottom rollers is generally very different, It is necessary for each distribution transmission to operate at the proper reduction ratio.

Therefore, in an advantageous embodiment, the distributor gear has a gear reduction ratio which is adapted to the speed of rotation of the respective drafting device bottom roller. By selecting a distribution transmission with an appropriate transmission reduction ratio, it is therefore easily possible to match the auxiliary drive exactly to the rotation speed of the drafting device bottom roller to be assisted.

Each drafting device bottom roller can have, at its drive point, an axle pinion for transmitting torque from the distribution transmission to each drafting device bottom roller. This shaft pinion can be formed as a gear machined into the drafting device bottom roller with which the gear of the distributor gear meshes. Torque can be transmitted without problems. However, no axial support is provided at the drive point. Radial support is provided only to a limited extent. Axial and radial support is provided according to the invention by a fixing device.

Furthermore, in an advantageous embodiment, the fastening device for the auxiliary drive has locking elements which are fastened to the housing of the distributor gear and which, on the end side, respectively, secure the fastening device at the support points. It is provided to have a bearing support for connection to each drafter bottom roller. The bearing supports preferably each comprise a rolling bearing. Plain bearings or roller bearings can be used as rolling bearings. Via locking elements and bearing supports of the fixing device, the distribution gears are each securely connected to the respective drafting device bottom roller of the drafting device.

The ring spinning machine preferably has a plurality of roller stands on which the drafting device bottom rollers are supported and the auxiliary drive is preferably arranged between two adjacent roller stands. It is

Furthermore, the fixing device comprises tension and/or pressure elements connecting the fixing device to the adjacent roller stands. This means that the tension element and/or the pressure element reliably avoids introducing forces into the fixing device which could ultimately damage the distribution gear. The tension element and/or the pressure element preferably take up axial forces.

Furthermore, an advantageous embodiment provides that the electric motor drive of the auxiliary drive is designed as an asynchronous motor. Such asynchronous motors constitute useful drive units frequently used in the textile machinery industry. This drive unit is also available relatively inexpensively as a mass-produced component at the appropriate specialty dealers.

The invention is explained in greater detail below on the basis of the illustrated exemplary embodiments.

1 is a side view of a double-row ring spinning machine with a long drafting device in which at least one drafting device bottom roller of the plurality of drafting device bottom rollers has an auxiliary drive; FIG. FIG. 4 is a schematic plan view of a drafting device in which an auxiliary drive device is connected to an intermediate bottom roller of the drafting device of a double-row ring spinning machine; 1 is a plan view of an auxiliary drive constructed according to the invention with a distribution transmission connected to an intermediate bottom roller of a drafting unit of a ring spinning machine; FIG. Figure 4 is a perspective view of the auxiliary drive formed in accordance with the invention shown in Figure 3;

FIG. 1 shows a double-row ring spinning machine 1 in a side view. This ring spinning machine 1 has a number of identical working units 2 in each of its longitudinal side regions.

These working units 2 are, in a known manner, respectively arranged in fixed positions, such as a drafting device 3, a spindle rail 4, and a vertically movably supported device, such as a ring rail 11, a balloon It has a limit ring 12 and a thread guide 13 .

Furthermore, the working unit 2 of such a ring spinning machine 1 generally comprises a creel 14 . Suspended on this creel 14 are roving bobbins 15, so-called "flyer bobbins". This roving bobbin 15 is processed in the working unit 2 to form a spinning cop. The winding tube of this spinning cop rotates with a spindle 5 arranged on a spindle rail 4 during the spinning process. As can be seen, such a ring spinning machine 1 also has a so-called "cop changer 6". The cop changer 6 has a gripping device 7 which is arranged in each gripper rail 8 . By means of this gripping device 7 the finished spinning cop can be transferred to a conveying device 9 corresponding to the length of the machine and a new empty tube can be transferred to the spindle 5 of the spindle rail 4 .

Further, the ring spinning machine 1 is provided with suction passages 16 on both sides in the longitudinal direction of the machine, as is well known. A so-called “roller stand 10 ” is attached to the suction passage 16 . Draft device bottom rollers 21 , 22 and 23 of the draft device 3 are supported by the roller stand 10 via a support carriage 17 .

In the present embodiment, the drafting device 3 has three drafting device bottom rollers, namely an inlet bottom roller 21, an intermediate bottom roller 22 and an outlet bottom roller 23, as can be seen in particular from FIG. ing. A corresponding draft device top roller 24 is conventionally supported on the support and weight arm 19 . This supporting/weighting arm 19 is attached to a supporting tube 20 with limited movement. This support tube 20 itself is fixed to the roller stand 10 . Furthermore, extending through the roller stand 10 are two parallel support and stabilization tubes 25 extending in the longitudinal direction of the machine.

FIG. 2 shows a very schematic plan view of the drafting device 3 of a double-row ring spinning machine 1 .

Such a double-row ring spinning machine 1 has a drafting device 3 arranged side by side on each side of the machine in the longitudinal direction. The draft device 3 has one inlet bottom roller 21, one intermediate bottom roller 22 and one outlet bottom roller 23 on each side in the longitudinal direction of the machine. These drafting device bottom rollers 21, 22, 23 are conventionally rotatably supported on a plurality of roller stands 10 via a support carriage 17 (not shown in FIG. 2). These roller stands 10 are arranged at regular intervals along the ring spinning machine 1 . The rotation of the draft device bottom rollers 21, 22, 23 is performed by a main drive device 26 arranged on the machine start side and a synchronous drive device 27 arranged on the machine end side on the opposite side of the ring spinning frame 1. . 2, in the middle region M of the ring spinning machine 1 with length L, an auxiliary drive 28 constructed according to the invention is mounted. This auxiliary drive device 28 is connected to the intermediate bottom roller 22 of the draft device 3 in this embodiment.

As shown, the auxiliary drive 28, which will be described in detail below with reference to FIGS. have. Both distribution gears 31 are each connected to a support point 38 of the intermediate bottom roller 22 of the drafting device 3 by means of a fixing device 33 .

In FIG. 3, an auxiliary drive 28 constructed according to the invention, which is interposed between the two roller stands 10 of the ring spinning machine 1, is shown in plan view and enlarged.

As can be seen, the auxiliary drive 28 has an electric motor drive 29, preferably an asynchronous motor. This electric motor drive 29 is connected to a main transmission 30, which is preferably designed as a gear transmission. Two distribution transmissions 31 are connected to this main transmission 30 via cross joints 32, respectively. Both distribution gears 31 themselves are each connected at a drive point 18 to one intermediate bottom roller 22 of the drafting device 3 . In other words, the gear transmission of the distribution gear 31 acts on a correspondingly formed gear wheel arranged on the intermediate bottom roller 22 and transmits the torque generated by the auxiliary drive 28 to the intermediate bottom roller 22 . do.

As can be seen, a fixing device 33 is mounted on the housing 34 of the distribution transmission 31 . The locking elements 35 of this locking device 33 are each provided with a bearing support 36 on the end side. Situated in this bearing support 36 are rotary bearings, ie plain bearings or roller bearings, in which the respective intermediate bottom rollers 22 of the drafting device 3 rotate. The rotation bearing thereby forms the support point 38 .

In order to be able to compensate for axial moments that occur during operation, the fixing device 33 is additionally provided with tension and/or pressure elements 37 . Via this tension element and/or pressure element 37 the fixing device 33 is connected to the adjacent roller stand 10 .

FIG. 4 shows a perspective view of an auxiliary drive 28 made in accordance with the invention.

As can be seen from FIG. 3, the auxiliary drive 28 has an electric motor drive 29, preferably an asynchronous motor. This electric motor drive 29 is connected to a main transmission 30 . This main transmission 30 itself is connected via a cross joint 32 to two distribution transmissions 31 . Both distribution transmissions 31 are connected to the intermediate bottom rollers 22 of the drafting device 3 of the ring spinning machine 1, respectively. That is, the torque applied by the electric motor drive 29 is transmitted to the intermediate bottom roller 22 of the drafting device 3 via the main transmission 30 and the distribution transmission 31 .

In order to protect the distributor gear 31 and thus the auxiliary drive 28 against overall harmful axial forces, the distributor gear 31 is furthermore provided with a respective fixing device 33 . In other words, a locking element 35 is arranged on the housing 34 of the distributor gear 31 . The locking elements 35 themselves each have a bearing support 36 on the end side. A bearing for rotation is arranged in this bearing support 36 . The intermediate bottom rollers 22 of the corresponding draft devices 3 are supported in these rotation bearings. In order to compensate for axial moments, the fixing device 33 also comprises tension and/or pressure elements 37 . Via this tension element and/or pressure element 37 the fixing device 33 is connected to the adjacent roller stand 10 .

1 ring spinning machine 2 working unit 3 drafting device 4 spindle rail 5 spindle 6 cop changing device 7 gripping device 8 gripper rail 9 conveying device 10 roller stand 11 ring rail 12 balloon limiting ring 13 yarn guide 14 creel 15 roving bobbin 16 suction passage 17 Support carriage 18 Drive point 19 Support and weight arm 20 Support tube 21 Entrance bottom roller 22 Intermediate bottom roller 23 Exit bottom roller 24 Draft device top roller 25 Support and stabilization tube 26 Main drive 27 Synchronous drive 28 Auxiliary drive 29 Electric Motorized drive 30 main gear 31 distribution gear 32 cross joint 33 locking device 34 housing 35 locking element 36 bearing support 37 tension and/or pressure element 38 support point M Middle region of drafting device of ring spinning machine L machine length

Claims (10)

A double-row ring spinning machine (1) comprising a drafting device (3) provided on each side of the machine, the drafting devices (3) being arranged one behind the other in the running direction of the fiber slivers. It has a plurality of arranged draft device bottom rollers (21, 22, 23) rotating at different rotation speeds, and the draft device bottom rollers (21, 22, 23) are arranged on the machine end side. a plurality of working units (2) arranged side-by-side on each side of the machine, which can be driven by a single drive (26, 27) and at least one additional auxiliary drive (28), Said drafting devices (3) are, in a double-row ring spinning machine (1), each part of a working unit (2),
Said auxiliary drive (28) comprises an electric motor drive (29), a main transmission (30) and two distribution transmissions (31), both distribution transmissions one of the devices (31) is assigned to one drafting device bottom roller (21, 22, 23) of the drafting device (3) arranged on one side of the machine, The other distribution transmission (31) is assigned to one drafting device bottom roller (21, 22, 23) of the drafting device (3) arranged on the other side of the machine and the distribution transmission The devices (31) each comprise a fixing device (33) which, for the support of said distribution gear (31), forms a first intermediate space between the two working units. is connected to each of said drafting device bottom rollers (21, 22, 23) at a support point (38) in the , said distributing transmission (31) is connected to each of two working units (2 ) is connected to each of said drafting device bottom rollers (21, 22, 23) at a drive point (18) in a second intermediate space between ). Each said fixing device (33) is mounted on each said drafting device bottom at another support point (38) in a third intermediate space between two working units for the support of said distribution transmission (31). 2. The ring spinning machine (1) according to claim 1, characterized in that it is connected to rollers (21, 22, 23). 3. The ring spinning machine (1) according to claim 2, characterized in that the drive point (18) is located in the middle between the two support points (38). Said main transmissions (30) are each connected to said distribution transmission (31) via a cross joint (32), said cross joint (32) being preferably covered by a housing. A ring spinning machine (1) according to any one of claims 1 to 3, characterized in that The distribution transmission (31) has a transmission reduction ratio adjusted to the number of rotations of the corresponding drafting device bottom rollers (21, 22, 23). A ring spinning machine (1) according to any one of claims 1 to 4. Each said drafting device bottom roller (21, 22, 23) has an axle pinion at said drive point (18) for transmitting said torque from said distribution transmission (31) to each said drafting device bottom roller. 6. A ring spinning machine (1) according to any one of claims 1 to 5, characterized in that it comprises a The locking device (33) has a locking element (35) fixed to the housing (34) of the distribution transmission (31), which lock elements (35) are end-wise respectively connected to the locking device. from claim 1, characterized in that it comprises a bearing support (36) for connecting (33) to each said drafting device bottom roller (21, 22, 23) at said support point (38). A ring spinning machine (1) according to any one of claims 6 to 6. 8. Ring spinning machine (1) according to claim 7, characterized in that a rolling bearing is arranged in the bearing support (36). The ring spinning machine (1) has a plurality of roller stands (10), and the draft device bottom rollers (21, 22, 23) are supported by the roller stands (10). 9. Ring spinning machine (1) according to any one of the preceding claims, characterized in that the device (28) is arranged between two adjacent roller stands. 3. Claim characterized in that the fixing device (33) comprises tension and/or pressure elements (37) connecting the fixing device (33) to the roller stands (10) adjacent to each other. 9. A ring spinning machine (1) according to 9 above.

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