DE4038351A1 - Spinner stoppage correction - involves feeding core yarn into false twister to prevent risk of yarn length comprising only staple fibres - Google Patents

Abstract

To correct a fault at a spinning assembly, where there is a drawing unit and a following pneumatic false twister with a core yarn feed to the delivery rollers of the drawing unit, the core yarn is initially passed into the pneumatic false twister on a stoppage at the drawing unit and the core yarn feed. When it is caught and held by the false twister, the drawing unit operation is resumed together with the feed of drawn sliver to the false twister. The core yarn is pref. laid in the pair of delivery rollers of the drawing unit, before the drawing function is resumed. On a stoppage, the drawing unit is opened, and the core yarn is laid round the pressure roller of the delivery roller pair to correct the stoppage. ADVANTAGE - The method avoids the risk that a section of the spun yarn is composed only of staple fibres without a core yarn in the centre.

Description

The invention relates to a method and an apparatus for Resolving a business interruption on a spinning unit, the with a drafting system and a subsequent pneumatic False twist device and with means for feeding a Core thread to a delivery roller pair of the drafting system is equipped, the in the event of a business interruption Function of the drafting system and the feeding of the core thread to be interrupted.

It is known to spin so-called core yarns in such a way that already in the pair of delivery rollers of a drafting system ready spun core thread, especially a filament thread, is added together with the drawn sliver then a pneumatic false twist device runs and is wound by the sliver. It is known (DE 38 08 815 A1), with such spinning in the case a business interruption, for example a break in the Core thread, a break in the core yarn or when it is reached the function of the drafting system of the specified coil dimension to interrupt and also to feed the core thread to stop. In the known method it is prescribed that when restarting, the drafting system again is put into operation so that sliver in the false twist  facility is arriving. Then the supply of the Core thread turned on again, which in the known design by supplying compressed air to the pair of delivery rollers led blow pipe happens.

The invention has for its object a method of to create the type mentioned at the beginning, in which is avoided that a piece of yarn is produced which is at risk that a section only from the staple fiber material without a core thread exists.

This task is carried out in a method of the type mentioned at the beginning Kind solved in that first the core thread in the pneumati false twist device introduced and after the false swirl device is picked up and kept ready, after which only the function of the drafting system and thus the supply of stretched sliver back to the false twist device is taken.

Through this measure it is always achieved that always the core thread is present when spinning. It exists thus there is no danger that a piece of yarn will only come out of the stack fiber material exists, which may not be immediately recognized and difficulties in later processing could lead. It also ensures that the core thread is always inside the core yarn and not about anywhere wrapped around the fiber material is.

In a further embodiment of the invention it is provided that the core thread before resuming the function of the stretch plant is inserted into the delivery roller pair of the drafting system. This ensures that when the function resumes of the drafting system and thus the delivery of the stretched Sliver also securely the core thread is delivered.  

In a further embodiment of the invention in a Vorrich device for performing the method provided that the means for feeding the core thread independently of the drafting device are switchable and that the false twist means for Take up and keep the core thread subordinate.

In a further embodiment of the invention it is provided that the means for feeding the core thread as one of the core threads coil-associated unwinding device are formed. Thereby it is ensured that the core thread is always defined Speeds is delivered.

In a further embodiment of the invention it is provided that the core thread in front of the delivery roller pair of the drafting system arranged, operable in the event of a business interruption riding device is assigned. This ensures that the core thread is in a defined position, if the business interruption is automatic or manual to be fixed.

In a further embodiment of the invention it is provided that the arranged after the false twist means for Pick up and keep the core thread ready as a suction direction are trained. Such a suction device also advantageously supports the insertion of the core thread in the false twist device. It's also easy possible, when the spinning process resumes the core thread on Output of the false twist device together with the fiber capture material and then cut the core thread. The Excess part of the core thread is then suctioned off.

Further features and advantages of the invention result from the following description of the Darge in the drawing put device.  

The drawing shows a partially sectioned side view of a spinning unit for pneumatic false twist spinning from Core yarn and related facilities for performing to fix a business interruption.

The spinning unit shown, which belongs to a machine that is equipped on a machine side with a large number of such spinning units arranged in a row next to one another, contains a multi-cylinder drafting device ( 4 ) which is passed through by a sliver ( 1 ) in the vertical direction. The sliver ( 1 ) is removed from a jug in a manner not shown. The sliver ( 1 ) is drawn in the 5-cylinder drafting device ( 4 ) to the desired yarn count. A core thread ( 2 ) is fed to the pair of delivery rollers ( 5 ) of the drafting system, which together with the sliver passes through a pneumatic false twist device ( 8 ) and is spun into a core yarn ( 3 ) there. The core yarn ( 3 ) is drawn off by means of a take-off device ( 11 ) arranged downstream of the false twist device ( 8 ) and runs to a cross-wound bobbin ( 12 ) which is driven by a winding roller ( 13 ).

The lower rollers of the drafting system ( 4 ) are designed as lower cylinders which run in the machine direction and are driven at one machine end. Of course, individually driven lower rollers can also be provided. The pressure rollers assigned to these lower rollers are designed as so-called pressure roller twins, ie they are each assigned to neighboring drafting units ( 4 ) in pairs and are held in a load carrier ( 6 ) via common axes, which can be pivoted about a rod ( 7 ) parallel to the lower rollers . To interrupt the function of the drafting system ( 4 ), the load carrier ( 6 ) can be swiveled about the axis ( 7 ) into the out-of-service function shown in dash-dot lines. This pivoting is carried out by means of a pneumatic cylinder ( 23 ), the piston ( 24 ) of which is attached to the load carrier ( 6 ) via a connecting rod ( 25 ) with a connecting element ( 26 ). It is preferably provided that the piston is extended by pressurization, but is moved back into the operating position by a built-in spring.

The pneumatic false twist device ( 8 ) consists of one or two known pneumatic false twist nozzles which have a continuous thread channel into which one or more compressed air blowing nozzles open tangentially. The pneumatic false twist device ( 8 ) is held by a swivel holder ( 9 ) which can be swiveled about an axis ( 10 ) running in the machine longitudinal direction. An adjustment device acts on the swivel holder ( 9 ) and is formed from a pneumatic cylinder ( 27 ), the piston ( 28 ) of which is articulated to the free end of the swivel holder ( 9 ) via a connecting rod ( 29 ) with a connecting element ( 30 ) . By moving the piston ( 28 ), the swivel holder ( 9 ) with the false twist device can be pivoted into the position shown in broken lines.

The core thread ( 2 ), for which a filament thread is preferably used, is presented in the form of a cheese ( 14 ). Two rollers ( 18 , 19 ) arranged above the drafting unit ( 4 ) and with their axes running in the machine in the longitudinal direction serve as holders for the cross-wound bobbin ( 14 ), which form a wedge gap in which the cross-wound bobbin ( 14 ) is inserted. The two rollers ( 18 , 19 ) are freely rotatably mounted in a swivel holder ( 15 ) which can be swiveled about an axis ( 16 ) running in the machine longitudinal direction. The over the pivot axis ( 16 ) projecting arm of the swivel holder ( 15 ) is articulated via a pull rope ( 35 ) to the swivel holder ( 9 ) of the pneumatic false twist device ( 8 ), so that when swiveling the swivel holder ( 9 ) into the dash-dotted line Position of the swivel bracket ( 15 ) is also pivoted about the axis ( 16 ) in the position shown in broken lines. The cross-wound bobbin ( 14 ) of the core thread ( 2 ) is guided in the axial direction by means of tabs ( 17 ) projecting laterally from the swivel holder ( 15 ). Below the roller ( 19 ), which is preferably provided with a rubber-elastic covering, there is a driven shaft ( 20 ) running through in the longitudinal direction of the machine. On this shaft ( 20 ), the roller ( 19 ) rests in the operating position. The roller ( 19 ) is thereby driven in the unwinding direction, so that the core thread ( 2 ) is supplied positively to the pair of delivery rollers ( 5 ) of the drafting device ( 4 ). The core thread ( 2 ) passes through a thread guide tube ( 21 ) which runs essentially parallel to the drafting system. After leaving the thread guide tube ( 21 ) ending with a flange ( 41 ), the core thread ( 2 ) is guided around a roller ( 22 ) attached to the load carrier ( 6 ), which is provided with a guide groove. This roller ( 22 ), which abut the pressure roller of the pair of delivery rollers and can be driven by this, leads the core thread to this pressure roller, from which the core thread is then taken along and together with the stretched sliver ( 1 ) of the pneumatic false twist device ( 8 ) is supplied.

In the event of a business interruption, the spinning unit is shut down. This interruption in operation can include breaking or running out of the supplied sliver ( 1 ), breaking or running out of the supplied core thread ( 2 ), breaking the spun core yarn ( 3 ) or even reaching the maximum filling level of the bobbin ( 12 ) o. the like. This condition is determined by appropriate detectors. In the exemplary embodiment, a detector ( 31 ) for monitoring the core yarn ( 3 ) and in the region of the thread guide tube ( 21 ) a detector ( 32 ) for monitoring the core thread ( 2 ) are provided after the pneumatic false twist device ( 8 ). If the other operational interruptions are also to be monitored, corresponding additional detectors must be provided. The detectors ( 31 , 32 ) (and possibly further detectors) are connected to a controller ( 39 ) which then causes the spinning unit to be stopped. The control device controls valves of the pneumatic cylinder ( 23 , 27 ) and a clamping device ( 37 ), which is located on the input side of the thread guide tube ( 21 ). The function of the drafting system ( 4 ) is interrupted by pivoting the load carrier ( 6 ) into the position shown in broken lines, so that the drafting system ( 4 ) is open. Furthermore, the false swirl device ( 8 ) is brought into the dot-dash position by pivoting its swivel holder ( 9 ), in which the running opening of the false swirl device ( 8 ) is accessible. The movement of the swivel holder ( 9 ) of the false twist device ( 8 ) is transmitted via the traction cable ( 35 ) to the swivel holder ( 15 ) of the cross-wound bobbin ( 14 ) with the core thread ( 2 ), so that it is pivoted into the dot-dash position in which the unwind drive is interrupted because the roller ( 19 ) is lifted off the shaft ( 20 ). In addition, the clamping device ( 37 ) is actuated so that the core thread ( 2 ) is held clamped such that at least its end is still in the thread guide tube ( 21 ).

The interruption in operation is remedied manually or also with the aid of a movable walking machine, which is indicated by the reference symbol ( 40 ). The sequence of operations is the same in both cases, so that the explanations below relate to the manual removal of the business interruption. The control ( 39 ) is provided with three push-button switches (P, Q and R) which can be operated by the operator or by the movable maintenance machine and by their actuation the pneumatic cylinders ( 23 , 27 ) and the thread clamp ( 37 ) individually in the Operating position can be brought.

First, it is checked whether the business interruption was not caused by the core thread ( 2 ) or the fiber sliver ( 1 ) being used up. If this should have been the case, a new sliver ( 1 ) and / or a new core thread ( 2 ) is presented accordingly. The core thread ( 2 ) is then inserted into the false twist device ( 8 ) as the first step in actually eliminating the business interruption. For this purpose, the thread clamp ( 37 ) is opened by pressing the corresponding button (P) of the control ( 39 ), after which a suction nozzle is connected to the flange ( 41 ) of the thread guide tube ( 21 ). Subsequently, the pneumatic cylinder ( 27 ) is brought into the operating position by actuating the switch (Q), so that the swivel holder ( 15 ) of the core thread bobbin ( 14 ) is brought into the operating position and the core thread ( 2 ) is unwound. The false twist device ( 8 ) is also pivoted back into the operating position, but this does not cause any further problems. After a sufficient length of thread has been taken up with the suction nozzle, the swivel holders ( 9 and 15 ) are brought back into the non-operating position. The core thread is then placed around the roller ( 22 ) and the pressure roller of the pair of delivery rollers ( 5 ) of the drafting system ( 4 ), which is still open. The core thread is then transferred to the pneumatic false twist device ( 8 ), which is in the dot-dash position of the business interruption. The compressed air supply to the false twist device can be interrupted or switched on. Below the false twist device there is a suction nozzle ( 38 ), which is either permanently connected to a vacuum source or which is switched on by the controller ( 39 ) by a corresponding control during this time. This suction nozzle picks up the thread end of the core thread guided through the false twist device ( 8 ) and holds it in place.

After these preparations have been made, the spinning unit is fully put into operation by closing the drafting device ( 4 ) by pressing the button (P, Q, R) accordingly, the false twist device ( 8 ) and the swivel holder ( 15 ) in the Operating position moved back and the thread clamp ( 37 ) are opened. The sliver ( 1 ) and core thread ( 2 ) now run together into the false twist device, in which they are spun into a core yarn ( 3 ).

This core yarn ( 3 ) is picked up at the exit of the false twist device ( 8 ) by means of a suction gripper, which initially takes off the core yarn ( 3 ). This suction pad expediently contains a separating device so that the beginning of the core yarn ( 3 ), which may consist only of the core thread ( 2 ), is separated. The core yarn is then inserted into the take-off device ( 11 ) with the suction gripper and then placed on the bobbin ( 12 ). In many cases it may be sufficient if the new core yarn start is simply placed on the bobbin without creating a thread connection. Under conditions can of course also be provided that between the new beginning of the core yarn ( 3 ) and the old core yarn on the spool ( 12 ), a thread connection, in particular a splice connection is made. In this case, the suction gripper then places the core yarn beginning in a corresponding splicing device into which a thread end unwound from the bobbin ( 12 ) is also inserted. In this procedure, a thread store must be provided, which stores the core yarn ( 3 ) delivered during the splicing. In this method, moreover, it is also expedient if o from the controller (39) during an interruption of operation of a further pneumatic cylinder. Like. The coil (12) of the winding shaft (13) and the pressure roller if necessary, the withdrawal roller pair (11) of the associated drive roller can be lifted off.

Claims (10)

1.Procedure for eliminating an interruption in operation on a spinning unit, which is equipped with a drafting system and a subsequent pneumatic false twist device and with means for feeding a core thread to a pair of delivery rollers of the drafting system, the function of the drafting system and the feeding of the core thread being interrupted during an operation are interrupted, characterized in that first the core thread is inserted into the pneumatic false twist device and is taken up and kept ready after the false twist device, after which only the function of the drafting unit and thus the supply of stretched sliver to the false twist device is resumed. 2. The method according to claim 1, characterized in that the core thread before resuming the function of the stretch plant is inserted into the delivery roller pair of the drafting system. 3. The method according to claim 1 or 2, characterized net that the drafting system opened during a business interruption is net, and that the core thread when fixing the business sub is placed around the pressure roller of the pair of delivery rollers. 4. A device for performing the method according to one of claims 1 to 3, characterized in that the means ( 19 , 20 ) for feeding the core thread ( 2 ) independently of the drafting device ( 4 ) can be switched on, and that the false twist device ( 8 ) Means ( 38 ) for receiving and holding the core thread ( 2 ) are arranged downstream. 5. The device according to claim 4, characterized in that the means for feeding the core thread ( 2 ) are designed as one of the core thread spool ( 14 ) associated unwinding device ( 19 , 20 ). 6. The device according to claim 5, characterized in that as a holder for the core thread spool ( 14 ) a swivel holder ( 15 ) with two a wedge gap for receiving the core thread spool forming rollers ( 18 , 19 ) is provided, one of which is in the operating position at one in Machine longitudinal direction by running, driven shaft ( 20 ). 7. The device according to claim 6, characterized in that the swivel holder ( 15 ) is connected to a lifting mechanism operable during an interruption in operation ( 27 , 35 ) for lifting the roller ( 19 ) from the driven shaft ( 20 ). 8. Device according to one of claims 4 to 7, characterized in that the core thread ( 2 ) is arranged in front of the delivery roller pair ( 5 ) of the drafting device ( 4 ) arranged, operable in the event of an interruption standby device ( 37 ). 9. The device according to claim 8, characterized in that the holding device contains a controllable thread clamp ( 37 ) and in the direction of the delivery roller pair ( 5 ) following thread guide tube ( 21 ). 10. Device according to one of claims 4 to 9, characterized in that the arranged after the false twist device ( 8 ) means for receiving and holding the core thread ( 2 ) are designed as a suction device ( 38 ).