EP3527703A1 - Method for operating a spinning station of a ring spinning machine after a doffing operation - Google Patents

Abstract

Disclosed is a method for operating a spinning station (2) of a ring spinning machine (1) after a doffing operation, the spinning station (2) comprising a spindle (8), a ring traveler, a thread guide and a drafting device (5) assigned to the spindle (8). having. The method comprises the method steps that a thread break after the Doffvorgang at the spinning station (2) is detected and a maintenance carriage (9) moves to the spinning station (2) and fixes the yarn breakage. In this case, the amount of yarn on the cop (7) is checked before the thread breakage by the maintenance trolley (9) and if there is too little yarn on the cop (7) to guide the yarn to the drafting system (5) and to set, the Kops (7) cleaned and a thread is attached to the empty cop (7), and the yarn is guided by means of the maintenance carriage (9) by ring traveler and thread guide to the drafting system (5) and attached there; and if there is enough yarn on the cop (7) to guide the yarn to the drafting system (5) and set, the yarn is guided by means of the maintenance trolley (9) by ring traveler and yarn guide to the drafting system (5) and attached there.

Description

Technical area

The present invention relates to a method for operating a workstation of a ring spinning machine after a doffing operation, a service trolley and a ring spinning machine according to the independent claims.

State of the art

Operating robots or service trolleys, which attach threads after a thread break on ring spinning machines, are well known. In particular, here is the operating robot from the EP0394671A2 called. This moves along a series of spinning stations, determines thread breaks and then tries to fix the determined thread breaks. Initially, by means of a special spindle brake device, the belt which drives the spindle is lifted off the spindle and then the spindle is stopped. Furthermore, a thread is used. One end of the auxiliary thread is fastened to a winder which can be moved around the spinning cop, in order to then be wound around the spinning cop. The auxiliary thread is then threaded through the ring traveler and the thread guide and brought into the area of the exit of the drafting system. The spindle and thus also the spinning cop are then driven again and brought the auxiliary thread in the web of the stretched roving, so that it is twisted with this.

However, if there is a thread break after doffing, it is disadvantageous that the service trolley tries to remedy this, too little yarn is on the sleeve to successfully perform a piecing operation. This can result in the yarn being unintentionally pulled off the sleeve with the thread-seeking device. The remaining yarn layers on the sleeve are too low after the thread search, so that there is a risk that the train during piecing, the yarn layers are moved or withdrawn.

Presentation of the invention

Object of the present invention is therefore to provide a method and a maintenance trolley, which fix a thread break after a Doffvorgang so that the yarn is not moved or withdrawn on the spinning cop.

The object is achieved by a method having the features of the independent patent claims.

• wenn sich zu wenig Garn auf dem Kops befindet, um das Garn zum Streckwerk zu führen und anzusetzen, der Kops von Garn gereinigt und ein Faden an dem leeren Kops angesetzt wird, und das Garn mittels des Wartungswagens durch Ringläufer und Fadenführer zum Streckwerk geführt und dort angesetzt wird; und
• wenn sich ausreichend Garn auf dem Kops befindet, um das Garn zum Streckwerk zu führen und anzusetzen, das Garn mittels des Wartungswagens durch Ringläufer und Fadenführer zum Streckwerk geführt und dort angesetzt wird.

The object is achieved in particular by a method according to the preamble of the method claim, which is characterized in that before the removal of the yarn breakage by the maintenance trolley, the amount of yarn is checked on the cop, and

• if there is not enough yarn on the cop to guide and set the yarn to the drafting system, the cop is cleaned of yarn and a thread is attached to the empty cop, and the yarn is fed to the drafting equipment by the service trolley through ring travelers and yarn guides and there is set; and
• when there is enough yarn on the cop to guide the yarn to the drafting system and to set, the yarn is guided by means of the maintenance trolley by ring traveler and thread guide to the drafting system and attached there.

Advantageously, it can be prevented by this method that the automatic piecing process does not succeed because there is too little yarn on the sleeve. Accordingly, the effectiveness and precision of the process is increased. The yarn breakage can be detected, for example, by an individual spindle monitor or a single spindle drive of the spindle.

Although the method could in principle be carried out by default during the entire spinning cycle, it is advantageously possible to carry it out only during piecing, ie while the first maximum of three layers are placed on the cop. A time limit, eg the first two to five minutes, would also be conceivable.

The yarn amount of the cop is advantageously checked by calculating the amount that has been spooled on the cop, in particular by calculating the amount of yarn over a time that the spindle has run and a yarn number in correlation with the time of yarn breakage becomes. The amount of yarn can be calculated, for example, from the delivery of the yarn (in m / min) or determined by a sensor.

Advantageously, the cleaning of the cop can be done by suction with a thread search mechanism. This allows a complete and quick cleaning of the cop.

In addition, it can be advantageously decided on the basis of a control of a maintenance trolley, if there is enough yarn on the cop. The maintenance car can work autonomously. It is possible in another embodiment that the machine control makes the decision and tells the maintenance car.

It further advantageously possible that after the spinning process has been continued after the Doffvorgang with an empty cop, no ring traveler movement was detected, directly a thread is attached to the empty cop, and the yarn is guided by means of the maintenance car by ring traveler and thread guide to the drafting system and there is set. It is basically checked whether a thread was clamped in the clamping crown, i. that a thread break already took place before the Doffen.

The invention also relates to a service trolley for carrying out a method according to one of the preceding claims, characterized in that the service trolley comprises a controller designed to determine whether there is sufficient yarn on the cop and if there is too little yarn is on the cop to lead the yarn to the drafting and set to clean the cop and attach a thread to the empty cop, and to bring the yarn by means of the maintenance car through ring traveler and thread guide to the drafting system and to put there; and if there is enough yarn on the cop to guide the yarn to the drafting system and to set to run the yarn by means of the maintenance trolley by ring traveler and thread guide to the drafting system and attach there. Advantageously, the control of the service trolley is designed to calculate the amount of yarn on the cop wound on the spool, and in particular the amount of yarn over a time that the spindle has run and a yarn number in correlation with the time of the To calculate thread breakage.

Advantageously, the maintenance trolley comprises a device for finding the thread end and for sucking the yarn and a device for attaching a thread to the empty cop.

The invention also relates to a ring spinning machine with a corresponding maintenance car.

Brief description of the figures

• Fig. 1 schematisch eine Ringspinnmaschine mit einem Wartungswagen; und
• Fig. 2 ein Ablaufschema des erfindungsgemässen Verfahrens;

zeigen. Gleiche Merkmale haben in unterschiedlichen Figuren gleiche Bezugszeichen.Further advantages of the invention are described in the following embodiments, wherein

• Fig. 1 schematically a ring spinning machine with a maintenance car; and
• Fig. 2 a flow chart of the inventive method;

demonstrate. Identical features have the same reference numerals in different figures.

Ways to carry out the invention

Fig. 1 schematically shows an inventive ring spinning machine 1, which has a plurality of juxtaposed spinning units 2. The spinning units 2 are arranged in a longitudinal direction x of the ring spinning machine 1 between a head 3 ₁ and a foot 3 _second Head 3 ₁ and foot 3 _{2 of} the ring spinning machine 1 may include bearings, drives, control, etc., which are necessary for the operation of the machine. How to continue, for example, two in the Fig. 1 2, each spinning station 2 consists of a roving bobbin 4, the is arranged above a drafting 5, and on which a roving 6 is wound. The roving 6 runs from the roving bobbin 4 via the drafting device 5, where it is stretched, to then be guided to a Garnbildungelement via a yarn guide. A circumferential ring winds the finished yarn on a Kops 7. The cop 7 is placed on a spindle 8. Along the ring spinning machine 1, a maintenance carriage 9 moves, which moves in the event of a thread break to a corresponding spinning station 1 and automatically fixes the yarn breakage. The individual spinning stations 2 can be equipped with spindle monitors or other sensors for monitoring the ring traveler in order to detect a yarn breakage. Alternatively or additionally, the spinning stations 2 can be equipped with single spindle drives.

The Fig. 2 shows a flow chart of the inventive method. The method relates to the starting process of a spinning station 2 of the ring spinning machine 1 after a Doffvorgang. During doffing by a doffer (not shown), a full cop 7 is removed from the spindle 8 and an empty cop 7 is placed on the spindle 8.

In a first method step 10, the spindle 8 is started again after doffing with the empty cop 7.

In a second method step 20, it is determined after doffing by means of the individual spindle monitor or another individual spindle monitoring that a thread break is fixed to a spinning station 2. When single spindle drive the spindle 8, this could be determined, for example via the torque or other available data, a thread break. In principle, the process could be carried out by default during the entire spinning cycle. However, it is also advantageously possible for it to be performed only on piecing, ie during the first maximum of three layers are placed on the cop 7. A time limit, eg the first two to five minutes, would also be conceivable. The maintenance trolley 9 then moves to the spinning station 2 and with the aim to eliminate the yarn breakage.

In a third method step 30, it is checked whether a thread is present at this spinning station 2. It is conceivable in principle that no thread was clamped in the clamping crown, i. that before or during the Doffen a thread break has taken place. Based on data, whether a rotor signal of the ring traveler was detected or not, it is decided whether one goes directly to the sixth step 60 (left side selection) or whether the thread break could be resolved by piecing means maintenance car 9 and a piecing. In this case, the process goes to the fourth step 40 (selection right side). This fundamental check could take place by a higher-level machine control or in the control of the maintenance trolley 9.

In a fourth method step 40, it is checked whether yarn length on the cop is sufficient to guide the yarn through the service trolley 9 from the cop 7 through the ring traveler and the yarn guide to the drafting device 5 and set. Advantageously, the yarn amount of the cop 7 can be checked, in which the amount is calculated, which was spooled by the spindle 8 on the cop 7. The amount of yarn can be calculated, for example, from the supply of the yarn (in m / min) or detected by a sensor and then determined. The yarn amount can thus be calculated, for example, by calculating a time that the spindle has run and a yarn number in correlation time of yarn breakage. If there is not enough yarn on the sleeve, the method continues at the fifth method step 50 (left branch). If there is sufficient yarn on the sleeve, the process continues at the seventh step 70 (lower branch).

In a fifth method step 50, the cop is cleaned of existing (residual) yarn. The cleaning of the cop is done by a located on the maintenance car suction device, which is guided along the surface of the cop. Such a cleaning device is, for example, from the unpublished PCT application PCT / IB2017 / 057254 known.

In a sixth method step 60 of the method, a thread is attached by the service trolley to the empty cop and in a seventh method step 70 of the method sets the maintenance trolley to the yarn in which he leads the yarn through the ring traveler and the thread guide to the drafting system. There, the yarn is applied in the conveying direction of the fiber material before or after a pair of output rollers of the drafting system to the existing fiber material. Such Anspinnvorgänge by the maintenance car are, for example EP0388938A1 known.

In an eighth and final step 80 of the process, the spindle is again rotated and the spinning process is restarted.

LIST OF REFERENCE NUMBERS

1

Ring spinning machine

2

spinning units

3 ₁

Head of the ring spinning machine 1

3 ₂

Foot of the ring spinning machine 1

4

roving

5

drafting system

6

roving

7

Kops

8th

spindle

9

service carriage

10

Process step: Start after doffing

20

Process step: yarn break detected

30

Process step: Checking whether rotor signal is detected

40

Process step: Check if yarn length is sufficient

50

Process step: Clean cop from yarn

60

Process step: Apply the thread to an empty cop

70

Process step: Attachment cycle with maintenance trolley

80

Process step: Start of the spinning process

x

Longitudinal direction of the ring spinning machine 1

Claims (15)

Method for operating a spinning station (2) of a ring spinning machine (1) after a doffing operation, the spinning station (2) comprising a spindle (8), a ring traveler, a thread guide and a drafting device (5) assigned to the spindle (8) and the ring spinning machine ( 1) comprises a maintenance trolley (9) and a doffer, comprising the method steps The spinning process is continued at the spinning station (2) after the doffing process with an empty cop (7); • a thread break is detected at the spinning station (2); • the maintenance trolley (9) moves to the spinning station (2) and fixes the yarn breakage; The spinning process is continued, characterized in that
before the thread breakage is corrected by the maintenance trolley (9), the amount of yarn on the cop (7) is checked, and • If there is too little yarn on the cop (7) to guide and set the yarn to the drafting system (5), clean the cop (7) of yarn and attach a thread to the empty cop (7), and Yarn is guided by means of the maintenance trolley (9) by ring traveler and thread guide to the drafting system (5) and attached there; and • if there is enough yarn on the cop (7) to guide and set the yarn to the drafting system (5), the yarn is guided by means of the maintenance trolley (9) through ring travelers and thread guides to the drafting system (5) and attached there. A method according to claim 1, characterized in that the amount of yarn of the cop (7) is checked, in which the amount that has been wound on the cop (7) is calculated. A method according to claim 2, characterized in that the amount of yarn is calculated from the supply of the yarn. A method according to claim 2 or 3, characterized in that the amount of yarn is calculated over a time that the spindle (8) has run and a yarn number in correlation with the time of yarn breakage. Method according to one of the preceding claims, characterized in that the cleaning of the cop (7) by finding the yarn end on the cop and suction is done. Method according to one of the preceding claims, characterized in that the method is carried out after Doffen, provided that no more than three layers on the cop (7) are present. Method according to one of the preceding claims, characterized in that a thread breakage has taken place immediately before, during or after Doffen at the workplace. Method according to one of the preceding claims, characterized in that it is decided on the basis of a control of a maintenance trolley (9), if there is enough yarn on the cop (7). Method according to one of the preceding claims, characterized in that the yarn breakage is detected by an individual spindle monitor or a single spindle drive of the spindle. Method according to one of the preceding claims, characterized in that after the spinning process after the doffing process with an empty cop (7) is continued, but no ring traveler movement was detected, a thread is attached to the empty cop (7), and the yarn by means of Maintenance trolley (9) is guided by ring traveler and thread guide to the drafting system and attached there. Maintenance trolley (9) for carrying out a method according to one of the preceding claims, characterized in that the maintenance trolley (9) comprises a control which is designed to determine whether there is enough yarn on the cop (7) and if too little Yarn on the cop (7) is to guide the yarn to the drafting system (5) and to set to clean the cop (7) and attach a thread to the empty cop (7), and the yarn by means of the maintenance trolley (9) to be guided by ring traveler and thread guide to the drafting system (5) and set there; and when there is enough yarn on the cop (7) to guide the yarn to the drafting system (5) and to set, to bring the yarn by means of the maintenance trolley (9) by ring traveler and yarn guide to the drafting system (5) and set there. Maintenance trolley (9) according to the preceding claim, characterized in that the control is adapted to calculate the amount of yarn on the cop (7) which has been wound on the spool, and in particular the amount of yarn over a time that the spool has run , and to calculate a yarn number in correlation with the time of yarn breakage. Maintenance trolley (9) according to one of claims 11 or 12, characterized in that a device for finding the yarn end and for sucking the yarn is present. Maintenance trolley (9) according to one of claims 11 to 13, characterized in that a device is provided to attach a thread to the empty cop (7). Ring spinning machine (1) with a maintenance trolley (9) according to one of the preceding claims 11 to 14.

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