DE19935695A1 - Rebuilding and modernizing, an open-end rotor spinning machine with a number of spinning stations, replaces the doffing and yarn splicing systems with at least one mobile maintenance unit using bobbin sleeves without starter yarns - Google Patents

Abstract

Rebuilding an open-end rotor spinning machine with a number of spinning stations (5), and modernizing it at the same time, includes replacing the bobbin doffing and yarn splicing systems by a new mobile maintenance unit (53,55). The unit exchanges a full bobbin with a new empty bobbin sleeve without splicing a sleeve yarn to the newly-spun yarn. To rebuild an open-end rotor spinning machine with a number of spinning stations (5), and modernize it at the same time, the bobbin doffing and yarn splicing systems are replaced by at least one new mobile maintenance unit (53,55) to travel along the spinning stations. The unit will exchange a full bobbin with a new bobbin sleeve which is empty and without a starter yarn and without splicing a sleeve yarn to the newly-spun yarn, so that the spun yarn is spliced to a separate yarn to be bonded to the empty sleeve. The sleeve loading unit is replaced by a feed (57) of empty sleeves at the maintenance unit.

Description

The invention relates to a method for converting and simultaneously modernizing an open-end rotor spinning machine

• - with several spinning positions,
• - With means for interrupting the spinning process of a spinning station for the purpose of a Spool change,
• - With at least one spool changing device movable relative to the spinning positions, the one Empty sleeve magazine and devices for exchanging a full spool for one too has winding empty tube,
• With a loading device for refilling the empty case magazine with empty cases,
• - With conveyor belts for removing full spools
• - And with at least one piecing device movable relative to the spinning positions, the is designed, after a bobbin change at a spinning station, a starter thread to spin on, which is already connected to the empty sleeve.

Open-end rotor spinning machines of this type are made by the company Schlafhorst Autocoro GmbH Manufactured under the brand name "Autocoro" for many years and are used worldwide. The principle of operation of this open-end rotor spinning machine "Autocoro" is in the US Patent 4,125,990. In the known open-end rotor spinning machine Spool changing device and the piecing device each independently along the Movable spinning positions. For the purpose of changing the bobbin is at the relevant spinning station first the spinning process is interrupted. Then the movable one changes Spool changing device the full spool of the relevant spinning station against a new one winding sleeve. The piecing device moves to this at a later point in time Spinning station and starts the spinning process again. This piecing device, which At the same time it is used to fix normal thread breaks connected thread piece. So such a piece of thread, which the piecing process possible power, even with a newly inserted sleeve, is provided in the Autocoro, to use those with a piecing thread instead of empty tubes. The piecing after a bobbin change can thus take place in the same way as the piecing on Fix a thread break.

However, this intrinsically fascinating method has the disadvantage that the starter thread on the Bobbin tube remains and therefore also when the spun yarn is reused, for example in weaving. There is a risk that the Starter thread differs somewhat from the subsequently spun thread, for example by the thread number and / or the direction of rotation and / or possibly also through the fiber material. Since the starter threads in the end product, For example, a fabric, they can change the look and / or quality of the Disrupt or deteriorate tissue.

The invention is therefore based on the object of the known ones already in use To modernize open-end rotor spinning machines by converting them produced bobbins do not contain starter thread.

The object is achieved in that the bobbin changing device and the piecing device replaced by at least one new maintenance device movable relative to the spinning positions which is designed to both a full sput against an empty starter thread Exchange sleeve as well as a piecing thread not connected to the empty sleeve to spin on and then a newly spun thread with the empty tube  connect, and that the loading device through a sleeve empty to the service unit feeding empty tube feeder is replaced.

A piecing device, which after piecing and modernizing the desired Requirements are described, for example, in US Pat. No. 5,676,322.

Because the piecing thread is no longer connected to the exchanged sleeve Starter thread is can be avoided in a very simple way that the piecing thread on the new sleeve is wrapped. It is then easily possible to use only yarn on the new tube wind up which has been spun at the relevant spinning position.

It is advantageous if the piecing thread is carried along with one in the new maintenance device Auxiliary spool is connected and after spinning is eliminated, after which the newly spun Thread is connected to the empty tube. To achieve this, after creating the The piecing point with the transfer of the newly spun thread to the tube only as long be waited until the piecing thread taken from the auxiliary bobbin is completely eliminated can be. After that, there is only a newly spun thread left on the core is wound up.

The new maintenance device is also expediently designed to break a thread fix by using a thread connected to the at least partially wound bobbin as Piecing thread is used. The maintenance device then takes the broken thread end from the Wind up and use this thread end for spinning. The auxiliary coil is in this case not required. The new service unit can therefore do two different piecing processes perform, namely the piecing process with auxiliary bobbin after a bobbin change and Piecing process with spun yarn taken from the spool of the spinning station a thread break.

Further advantages and features of the invention result from the following description a schematically illustrated embodiment.

Show it:

Fig. 1 is a plan view of a changeover to be modernized by open-end rotor spinning machine,

Fig. 2 shows a cross section through a spinning station of a rotor spinning machine to be modernized,

Fig. 3 is a plan view of a modernized by conversion open-end rotor spinning machine,

Fig. 4 shows a cross section through a spinning position at which just a new maintenance unit is active, in which only the functional elements are shown for a spool change,

Fig. 5 shows the same maintenance device as in Fig. 4 at a spinning position, this time only the functional elements for piecing are shown.

The open-end rotor spinning machine 1 according to FIG. 1 to be modernized is essentially symmetrical with respect to a longitudinal center plane 2 and is provided on both machine sides 3 and 4 with a large number of spinning stations 5 arranged next to one another. At the two ends of the open-end rotor spinning machine 1 there are headstocks 6 and 7 , in a known manner, in which the drive and supply devices are accommodated.

A piecing device 9 can be moved in the directions of travel A and B by means of travel rails 8 , which are only indicated by dash-dotted lines in a curve area, but extend in both longitudinal directions of the open-end rotor spinning machine 1 . This piecing device 9 serves the purpose of restoring the spinning process in the event of a thread break at a spinning station 5 and of initiating the spinning process after a bobbin change by means of a piecing process.

Along the open-end rotor spinning machine 1 , a bobbin changing device 10 can also be moved in directions of travel C and D. For this purpose, separate rails 11 are provided, which are also only indicated. The rails 8 and 11 are separated so that the piecing device 9 and the bobbin changing device 10 do not interfere when they have to pass each other.

The bobbin changing device 10 is provided with an empty tube magazine 12 , which constantly keeps a certain number of empty tubes 15 on the bobbin changing device 10 in stock. If necessary, new empty sleeves 15 are supplied by means of a loading device 16 located on a headstock 6 . These new empty tubes 15 can either pick up the bobbin changing device 10 on the loading device 16 or can be brought by means of an additional loading wagon. The loading device 16 in turn receives new empty tubes 15 via a tube template 17 attached to the machine end.

Both sides of the longitudinal center plane 2 of the open-end rotor spinning machine extending in the longitudinal direction 1 of two conveyor belts 13 and 14, of which each one of a machine side is associated or 3. 4 The conveyor belts 13 and 14 are driven in the transport directions E and F and serve to remove filled bobbins after a bobbin changing process. The open-end rotor spinning machine 1 to be converted works with empty sleeves 15 , which are provided with so-called starter threads 52 (see later under FIG. 2), so that after a bobbin changing process, the spinning process can be initiated again by spinning on. The starter threads 52 are applied to the empty tubes 15 in the area of the headstock 6 by means of a starter coil device 18 .

In the spinning station 5 shown in FIG. 2 of an open-end rotor spinning machine 1 to be modernized, both a piecing device 9 ( only indicated) and a bobbin changing device 10 carrying an empty tube magazine 12 can be seen. As a result, there are always some empty tubes 15 with a starter thread 52 available for a bobbin changing process, and then the piecing device 9 can carry out a piecing process at the spinning station 5 by means of the starter thread 52 . In normal operation, a dotted thread 20 is spun at the spinning station 5 in a known manner from a supplied fiber sliver 19 .

Each spinning station 5 contains a feed roller 21 for feeding the sliver 19 , a dissolving roller 22 for separating the sliver 19 into individual fibers and a spinning rotor 23 in which the individual fibers are combined to form a fiber ring and spun into the thread 20 . The spinning rotor 23 rotates in a vacuum chamber 24 which is connected to a suction line 25 . The shaft 26 connected to the spinning rotor 23 is supported and driven in a manner not shown.

In operation, the vacuum chamber 24 is closed by a cover 27 which, in a known manner, has a fiber feed channel 28 for feeding the individual fibers into the spinning rotor 23 and a thread take-off channel 29 for pulling off the spun thread 20 .

During operation, the thread 20 is drawn off in the take-off direction G by a pair of draw-off rollers 30 , which belongs to the spinning station 5 and which consists of a drive shaft 31 running through in the machine longitudinal direction and a pressure roller 32 . The drawn-off thread 20 then reaches a winding roller 33 , which also belongs to the spinning station 5 and on which the bobbin 34 to be wound lies. The winding roller 33 , which is connected to a drive shaft 35 running in the machine longitudinal direction, drives the bobbin 34 to rotate, so that a bobbin can be produced with the cooperation of a traversing thread guide 36 . To compensate for tension, a winding guide 37 is connected upstream of the winding roller 33 .

During operation, the rotating spool 34 is held in a spool frame 38 which also belongs to the spinning station 5 and which has a spool plate 39 on each side of the spool 34 . The bobbin frame 38 can be pivoted about a machine-fixed pivot axis 40 , so that the bobbin frame 38 can pivot upward from the winding roller 33 as the number of bobbins increases, the bobbin 34 being constantly driven by the winding roller 33 . The swivel directions of the coil frame 38 are denoted by H and K.

When the degree of filling is reached, the full bobbin 41 shown in broken lines must be replaced with a new sleeve 47 to be wound. The desired degree of filling is achieved when, for example, controlled by a length measuring device for the spun thread 20 , a corresponding signal is given. In such a case, as shown, the full spool 41 lifts off the winding roller 33 in a known manner, so that the spool 41 is no longer driven. At the same time, the spinning process at the spinning station 5 must be interrupted.

For this purpose, the spinning station 5 contains means 43 for interrupting the spinning process. These means 43 can include a clutch 44 , through which the feed roller 21 can be separated from a drive, not shown. In order, nevertheless, for the purpose of subsequent piecing, to be able to temporarily drive the feed roller 21 despite the drive being interrupted, the feed roller 21 is connected to a drive pinion 45 protruding from the spinning station 5 toward the operating side for an external drive.

A bobbin change is carried out with the bobbin changing device 10 already mentioned, which can be moved in a manner not shown by means of wheels on the rails 11 relative to the spinning stations 5 . The bobbin changing device 10 contains devices 46 for exchanging a full bobbin 41 for a sleeve 47 to be wound, which is already carried by the bobbin changing device 10 .

To remove the full bobbin 41 from the bobbin frame 38 , the bobbin changing device 10 contains an ejector 48 which can be pivoted about a pivot axis 49 of the bobbin changing device 10 in accordance with the pivoting directions L and M. The corresponding drive is not shown. The spool frame 38 is opened sideways so that the full spool 41 can roll over a slide 50 of the spinning station 5 in the unwinding direction N onto the assigned conveyor belt 13 or 14 . By means of this conveyor belt 13 , 14 , the full spool 41 can be transported to the machine end for further treatment.

The bobbin changing device 10 also contains a sleeve gripper 51 which , for example, can also pivot about the pivot axis 49 in accordance with the pivoting directions P and Q, the drive not being shown here either. By means of the sleeve gripper 51 , a sleeve 47 to be rewound can be inserted into the coil frame 38 , as is the case with the open-end rotor spinning machine 1 from the company Schlafhorst described at the beginning.

Since in the open-end rotor spinning machine 1 to be converted, the spinning process is interrupted for the purpose of changing the spool, a possibility must be created to start the spinning process again. This takes place in the open-end rotor spinning machine 1 to be converted in that each sleeve 47 to be rewound is connected to a starter thread 52 which is at least long enough that it is sufficient for a piecing process. The piecing itself takes place in the open-end rotor spinning machine 1 to be converted by means of the piecing device 9 , of which only the contour is shown, since this piecing device 9 is to be replaced by another maintenance device 53 (see FIGS. 3 to 5). The previous piecing device 9 can also be moved along the spinning stations 5 and is designed to spin the piecing thread 52 connected to the new sleeve 47 at the spinning station 5 .

Due to the piecing thread 52 connected to the sleeve 47 to be rewound, each bobbin 34 is provided with a piecing point at the beginning of its winding process. Even if it is possible today to make such piecing points practically the same thread, the starter thread 52 used may be disadvantageous. This starter thread 52 namely remains on the bobbin 34 to be wound and therefore also remains in the spun yarn during further processing, for example during weaving. There is then a risk that the starter thread 52 differs from the normal spun thread 20 , for example by the thread number and / or the direction of the spinning twist and / or by the fiber material. Since the starter threads 52 get into the end product, for example a fabric, they can impair the appearance and / or the quality of the product.

For this reason, the open-end rotor spinning machine 1 is improved by retrofitting, by replacing the old piecing device 9 and the old bobbin changing device 10 in a manner to be described by a new maintenance device 53 without the need for a piecing thread 52 connected to a sleeve.

In Fig. 3 is a top view of an open-end rotor spinning machine 54 modernized by retrofitting. As far as components of the old open-end rotor spinning machine 1 are used, the reference numerals have been retained.

As can be seen, the bobbin changing device 10 and the piecing device 9 have been replaced by a combined new maintenance device 53 . To increase the performance, an identical, further maintenance device 55 , which is only shown in dash-dotted lines, can optionally be added. The maintenance devices 53 and 55 each take on the functions of piecing and doffing. In a manner to be described later, the maintenance devices 53 , 55 each carry an auxiliary bobbin 56 , which makes the use of a piecing thread 52 already described superfluous.

Since there is no longer an empty tube magazine 12 , the open-end rotor spinning machine 54 was equipped with an empty tube feed device 57 when converting, which will be described in detail later. It contains an upright, circumferential tangential belt 58 which moves in the direction of the arrows R, S, T and U. The empty tube feed device 57 begins at the tube template 17 already described and ends there again. The previous loading device 16 and the previous Starterspulenein device 18 are no longer required, but do not necessarily have to be dismantled.

The continuously rotating tangential belt 58 is able to always feed an empty sleeve 59 to the service unit 53 on request. This empty sleeve 59 contains no starter thread. The maintenance device 53 (and similarly the possibly existing maintenance device 55 ) contains a stop 60 which can be advanced to the tangential belt 58 in such a way that the supplied empty sleeve 59 can be stopped on the maintenance device 53 and taken over by the latter with a gripping device to be described later.

The maintenance device 53 always contains an empty sleeve 59 stored. When changing the bobbin, this stored sleeve 59 is then used. Since, due to the combination with a piecing device, the maintenance device 53 is still in operation for a while at the spinning station 5 , the sleeve template 17 immediately requests a new empty sleeve 59 , which is fed with the tangential belt 58 up to the stop 60 . After a required bobbin change with subsequent piecing, the maintenance device 53 thus has a new empty sleeve 59 which is carried along.

In FIG. 4, the bobbin-changing operation will now be described by means of the maintenance device retrofitted 53rd The reference numerals of components already described are retained, in particular in the area of the spinning station 5 .

As can be seen, the old bobbin 39 has been replaced by another bobbin 61 because so-called thread catch slots 62 are required for the new maintenance device 53 on the bobbin 61 , the purpose of which will be explained later.

The maintenance device 53 contains a coil ejector 63 , which is essentially a piston-cylinder unit that can be actuated in the thrust direction V. The piston is connected to a thrust plate 65 which acts on the full spools 41 in a two-point support and pushes them out of the open spool frame 38 onto the slide 50 in the unwinding direction N. Sidewalls 66 are attached to the thrust plate 65 , which grip around the full spool 41 to be ejected on the two end faces and thereby align them. The ejection position of the thrust plate 65 is shown in broken lines with the reference number 67 . From the chute 50 , the spool 41 then reaches one of the conveyor belts 13 or 14 , which were retained during the changeover.

The new maintenance device 53 also contains an empty-case gripper 68 , which likewise has a piston-cylinder unit and can be pivoted about a pivot axis 69 . When a bobbin is changed, the empty tube gripper 68 is available from the outset with an empty tube 59 near the coil frame 38 , so that a new empty tube 59 can be inserted immediately after the full bobbin 41 has been ejected. The position 70 shown dotted indicates the position of the empty sleeve gripper 68 .

After changing the bobbin, the piecing process to be described in FIG. 5 must be carried out. Until then, the empty sleeve gripper 68 fetches a newly requested empty sleeve 59 , which is brought about on the continuously rotating tangential belt 58 , up to the abovementioned stop 60 . By means of gripping fingers 71 and 72 , which are movably attached to the empty tube gripper 68 , the latter picks up an empty tube 59 from the empty tube feed device 57 .

The tangential belt 58 , as can be seen in FIG. 4, is bordered between the support rails 73 and 74 with play.

5 nor a piecing operation must be carried out now in FIG.. Once again, the components already described are provided with the same reference numerals as before.

According to FIG. 5, the new maintenance device 53 always carries with it an auxiliary spool 56 , from which an auxiliary thread 75 can be unwound for spinning. The nature of the auxiliary thread 75 is not important per se, since it is eliminated in any case before winding onto a new sleeve 59 . The auxiliary thread 75 only has to be suitable for piecing and in particular be sufficiently tear-resistant.

The auxiliary thread 75 is always clamped by an auxiliary thread delivery mechanism 76 of the new maintenance device 53 . The auxiliary thread delivery mechanism 76 is arranged on a swivel lever 77 which can be swiveled about a swivel axis 78 of the service unit 53 by means of drives (not shown). The swivel directions are labeled W and X.

In connection with a piecing process caused by a bobbin change, the pivoting lever 77 pivots into a position 79 shown in broken lines in the vicinity of a suction nozzle 80 . The auxiliary thread feed mechanism 76 is driven. The suction nozzle 80 can then grip and suck the auxiliary thread end 81 of the auxiliary thread 75 . As much is drawn in as is required for a piecing process.

The auxiliary thread delivery mechanism 76 now opens and swings back into the starting position shown with solid lines, that is to say in the vicinity of the auxiliary spool 56 . As a result, a further swivel lever 82 , which contains a pair of piecing rollers 83 at its end, can pivot into the auxiliary thread run 84 between the suction nozzle 80 and the auxiliary thread feed mechanism 76 , as shown by solid lines. The piecing roller pair 83 which is initially open is closed after the auxiliary thread 75 has been gripped, so that the latter is clamped.

A thread shear 85 located between the piecing delivery roller pair 83 and the auxiliary thread delivery unit 76 now produces a piecing thread 86 . The rest of the auxiliary thread end 81 remains inside the suction nozzle 80 .

Now the swivel lever 82 can pivot together with the piecing thread 86 into a piecing position 87 shown in broken lines, in which the piecing delivery roller pair 83 is adjacent to the thread take-off channel 29 . The piecing delivery roller pair 83 can be rotated relative to the pivoting lever 82 during this pivoting movement, so that the piecing thread 86 can be transferred to a position 88 suitable for piecing. A pivot axis 89 is provided for this pivoting movement of the pivot lever 82 .

Controlled by a control device (not shown), the piecing delivery roller pair 83 delivers the piecing thread 86 back into the spinning rotor 23 , where it is attached to a fiber ring already located there. The fiber ring can be produced in that the feed roller 21 can be driven temporarily via the drive pinion 45 by an external drive 90 of the maintenance device 53 . The external drive 90 can be fed to the drive pinion 45 in the direction of the arrow Y and can later be removed again in the direction of the arrow Z. Controlled by the control device (not shown), the piecing delivery roller pair 83 pulls the spun yarn back out of the spinning rotor 23 at the right moment in a manner known per se, but this still runs into the suction nozzle 80 . The spun thread runs into the suction nozzle 80 until the auxiliary thread 75 required for spinning is completely suctioned off. The auxiliary thread 75 can thereby be eliminated.

As soon as a newly spun thread 91 with the correct thread number leaves the thread draw-off channel 29 , the piecing delivery roller pair 83 transfers the newly spun thread 91 into the open machine-side draw-off roller pair 30 , which is then closed. The piecing delivery roller pair 83 opens simultaneously and swings out to the side.

During the piecing process described, the newly inserted empty sleeve 59 is constantly lifted from its operational winding roller 33 and temporarily rests on an auxiliary winding roller 92 of the maintenance device 53 , which can be pivoted about an axis 97 by means of a pivot lever 96 in accordance with the double arrow. The sleeve 59 can be driven by the auxiliary winding roller 92 in a controlled manner.

A separating device 93 located in the suction nozzle 80 cuts through the newly spun thread 91 which is still entering the suction nozzle 80 . In a manner known per se, as described, for example, in US Pat. No. 5,676,322, the separated spun thread 91 can now be wound laterally onto the sleeve 59 to form a thread reserve winding, while the separated end is discharged as waste in the suction nozzle 80 . So that this thread reserve can be generated, the previous bobbin 39 was replaced by a new bobbin 61 , which is provided with catch slots 62 .

The spun thread 91 shown in dash-dot lines leads to the catch slots 62 by means of the suction nozzle 80 , which for this purpose can be moved into a position 94 in a manner not shown. The spun thread 91 takes the path 95 shown in dotted lines, which goes from the thread take-off channel 29 through the take-off roller pair 30 and over the deflecting thread guide 37 to the empty sleeve 59 inserted into the bobbin frame 38 . After that, after removing the auxiliary winding roller 92 , the coil frame 38 can be lowered again in the direction of the arrow K until the sleeve 59 rests on its winding roller 33 . The thread thereby arrives in the constantly moving traversing thread guide 36 .

The new maintenance device 53 thus differs from the original piecing device 9 essentially in that the piecing thread 86 is connected to an auxiliary spool 56 carried in the new maintenance device 53 and is eliminated after piecing, after which the newly spun thread 91 is emptied with the thread to be wound Sleeve 59 is connected. In this process, the piecing point is completely eliminated and does not reach the empty sleeve 59 to be wound.

Furthermore, the new maintenance device 53 now also contains the functional elements required for changing the spool.

The maintenance device 53 is not only able to carry out a piecing process by means of an auxiliary thread 75 after a bobbin change. The maintenance device 53 can additionally carry out piecing in a conventional manner after a thread break. If a thread break occurs during the normal spinning process, the suction nozzle 80 picks up the broken thread end from the bobbin 99, which is only shown in broken lines, and uses this thread end for the piecing. The auxiliary coil 56 is not required in this case. The piecing delivery roller pair 83 can then be moved to a position 100 where it is able to receive a piecing thread 98 drawn from the bobbin 99 . The piecing thread 98 is then cut to the required dimension by means of a separating device 101 before it is fed to the thread take-off channel 29 in the manner already described.

Claims (4)

1. Method for upgrading and modernizing an open-end rotor spinning machine at the same time

• - with several spinning positions,
• with means for interrupting the spinning process of a spinning station for the purpose of changing the bobbin,
• with at least one bobbin changing device which is movable relative to the spinning positions and which has an empty tube magazine and devices for exchanging a full bobbin for an empty tube to be wound,
• with a loading device for refilling the empty case magazine with empty cases,
• - With conveyor belts for removing full spools
• and with at least one piecing device which is movable relative to the spinning positions and which is designed to spin a starter thread at a spinning position after a bobbin change, which is already connected to the empty tube,

characterized by that the bobbin changing device and the piecing device by at least one relative new maintenance device that can be moved to the spinning positions, which is to be replaced is designed to replace both a full bobbin with an empty sleeve free of starter thread as well as piecing a piecing thread not connected to the empty tube and then connect a newly spun thread to the empty tube, and that the Loading device through an empty tube feeder feeding empty tubes to the maintenance device device is replaced.   2. The method according to claim 1, characterized in that the piecing thread with one in the new service unit is connected to the auxiliary coil and after piecing is eliminated, after which the newly spun thread is connected to the empty tube. 3. The method according to claim 1 or 2, characterized in that the new maintenance device is also designed to fix a thread break by one with the least partially wound bobbin of connected thread is used as piecing thread.