EP3476787B1 - Traversing unit, method for operating a traversing unit and workstation with a traversing unit - Google Patents

Description

The present invention relates to a traversing unit for traversing a yarn opposite a take-off roller pair of a workstation of a textile machine with a Garnführeinheit, with a traversing single drive for driving the Garnführeinheit, and with a conversion element, by means of which a rotational movement of the traversing single drive in a linear, reciprocating motion of Garnführeinheit is implemented. Moreover, the invention relates to a workstation with a traversing unit. Furthermore, the invention relates to a method for operating a traversing unit.

From the DE 10 2006 004 894 A1 is an auxiliary yarn guide for traversing a running thread in the area of a thread withdrawal device of a cheese-producing textile machine known. The auxiliary yarn guide is connected to a reversible operable single drive. The individual drive is designed as a stepper motor, so that the position and the distance of the reversal points can be set defined with appropriate control of the stepping motor. The disadvantage of this is that the reversible operable single drive for traversing the thread must be controlled consuming.

Object of the present invention is therefore to eliminate the disadvantage of the prior art.

The object is achieved by a traversing unit, a method for operating the traversing unit as well as a working station with a traversing unit having the features of the independent patent claims.

A traversing unit is proposed for traversing a yarn in relation to a take-off roller pair of a workstation of a textile machine. The traversing unit comprises a yarn guiding unit which transmits a traversing motion to the yarn. The traversing unit further comprises a traversing single drive with which the yarn feeding unit is driven. In addition, the traversing unit comprises a transfer element, by means of which a rotational movement of the traversing individual drive can be converted into a linear, reciprocating movement of the yarn guiding unit. The linear, reciprocating motion is the traversing or traversing motion that is transmitted to the yarn. Due to the traversing of the yarn, the take-off roller pair is subjected to a wide range by the yarn running between them, so that a cutting of the yarn into the lateral surfaces of the take-off rollers is prevented.

According to the invention, the single traction drive is designed as a revolving motor. The revolving motor may be a so-called rotary, which is movable only in one direction of rotation, or has only one direction. As a result, the individual traversing drive can be made less expensive, in contrast to a reversible motor which can rotate in both directions. In addition, the rotating motor, in contrast to a reversible motor also has a much lower susceptibility to interference, so that the traversing device can be operated economically. In addition, thereby the control of the traversing single drive can be simplified, since this only has to perform a permanent circumferential movement. The position of the reversal points is determined by means of the conversion element.

In addition, at least one center position of the yarn guiding unit can be detected by means of a sensor. The center position can be, for example, a position centered on the take-off rolls. In this way, it can be recognized whether the yarn guiding unit is correctly positioned with respect to the take-off rolls, so that uniform wear over the width of the take-off rolls can be done. However, the center position can also be the position at which the yarn comes from the workstation, in particular a take-off tube. This exit point of the yarn is usually positioned centrally at the work site. As a result, for example, if a twine is to be reintroduced into the draw-off tube in a yarn break, it can be determined whether the yarn guide unit is in the center position and thus directly above the draw-off tube. This simplifies insertion, as it does not have to pay attention to a lateral offset between the yarn guide unit and the exhaust tube.

In an advantageous development of the invention, the conversion element comprises an eccentric element which cooperates with at least one guide element. The eccentric element may be, for example, an eccentric disc. The guide element may for example be designed as a slot in which the eccentric element is rotatably arranged. The at least one guide element can be provided, for example, on the yarn guide unit. The rotation of the eccentric moves the guide element linearly back and forth, thereby generating the traversing movement. By means of the eccentric element and the guide element, the rotation of the individual traction drive in one direction is converted into a linear reciprocating movement in a simple manner. Preferably, the guide element is arranged directly on the movable yarn guide unit.

It is also advantageous if the at least one guide element of the yarn guiding unit comprises two guide edges, between which the eccentric element is guided. The guide edges may for example be aligned parallel to each other. As a result of the rotation of the eccentric element between the two preferably parallel guide edges, these can be displaced back and forth in an axial direction of the draw-off rolls, so that the yarn guiding unit can be displaced in the axial direction.

Furthermore, it is advantageous if the sensor is arranged adjacent to the conversion element, in particular the eccentric element. By way of example, the sensor is thus able to recognize which side of the eccentric element is facing it. If, for example, the eccentric element is arranged such that in the middle position of the yarn guiding unit the thick, bulbous side of the eccentric element faces the sensor, then the sensor can detect the center position therefrom.

It is also advantageous if the sensor is a Hall sensor. Additionally or alternatively, the conversion element may also comprise a magnetic element, which can be detected by the sensor, in particular the Hall sensor. The magnetic element can be arranged directly on the eccentric element. If the magnetic element is arranged on the conversion element, the magnetic field of the magnetic element can be detected when the conversion element or eccentric element passes by the Hall sensor. As a result, the orientation of the conversion element can be detected. An advantage of the Hall sensor is that the orientation or position of the transfer element and / or the eccentric element can be detected without contact.

It is furthermore advantageous if the yarn guiding unit comprises a cutting unit by means of which the yarn is separable. For example, if the job is to be stopped or there is a yarn defect in the yarn, the yarn may be separated to obtain a defined yarn end or to remove the yarn defect. Additionally or alternatively, the yarn guiding unit can also comprise a blowing unit, by means of which a yarn end can be blown into the work site. At the yarn end, the yarn can be spun again, so that, for example, a spinning process can be continued. The cutting unit and the yarn guiding unit can also be formed together as a cutting / blowing unit, so that the traversing unit is made more compact.

It is advantageous if the yarn guiding unit comprises a measuring unit, by means of which a state of the yarn is recognizable. The measuring unit can recognize, for example, the above-mentioned yarn defects. The measuring unit increases the yarn quality. Furthermore, the measuring unit of the cutting and / or blowing unit may be arranged downstream in the direction of flow of the yarn. As a result, for example, the blowing unit when Garnansetzen the yarn does not blow through the measuring unit, but this can promote directly back into the workplace.

It is also advantageous if the individual traversing drive is fixedly arranged at the workstation and the at least one guide element is displaceable relative to the workstation with the aid of the eccentric element. In general, the individual traversing drive has a greater weight than the at least one guide element, so that the movable masses are kept small when the traversing drive and the displaceable guide element are stationary. As a result, the energy consumption of the individual drive is kept low. In principle, however, it would also be conceivable to arrange the traversing individual drive in a movable manner with the yarn guide unit and to provide the at least one guide element firmly at the workstation.

Advantageously, the sensor and / or the conversion element is arranged on the traversing unit in such a way that at least one aligned position of the yarn feeding unit can be seen to a withdrawal tube of the job. Due to the aligned position of the traversing unit to the draw-off tube, the blowing unit can blow the yarn end more easily into the draw-off tube.

Furthermore, a job with a traversing unit is proposed. The traversing unit is designed according to one or more of the features described in the preceding and / or following description.

Furthermore, a method for operating a traversing unit of a workstation of a textile machine is proposed. The traversing unit may be designed according to one or more of the features described in the preceding and / or following description.

In the method, a running yarn is guided in a yarn guiding unit of the traversing unit. The yarn feeding unit is reciprocated linearly by means of a single traverse drive and a transfer element for traversing the yarn with respect to a pair of take-off rollers of the work station. The linear reciprocating motion is called traversing motion. The yarn, which is in the deduction between two rolls of the pair of delivery rollers, is thereby moved back and forth in the axial direction of the rollers or perpendicular to its withdrawal direction. As a result, a uniform wear of the take-off rolls is achieved and prevents the yarn cuts at one point in the take-off rolls.

According to the invention, the traversing individual drive is operated as a circulating motor. The revolving motor can be designed, for example, as a rotary motor. The rotating motor rotates only in one direction of rotation, so that it can be made cheaper and easier than a motor that can rotate in both directions. In addition, the revolving motor, which rotates in one direction only, can be controlled more easily than a motor which rotates alternately in both directions to form the direction of change in the traversing movement.

In addition, in the method, at least one center position of the yarn guiding unit is detected by means of a sensor. As a result, it can be detected whether the yarn is aligned to a center position of the job.

In an advantageous embodiment of the invention, the yarn guide unit is positioned at an interruption of the running yarn at the work site, that the Garnführeinheit the deduction tube of the job is aligned. As a result, a yarn end formed at the interruption can be blown into the draw-off tube and a piecing process can be started to resume the production of the yarn. Preferably, the center position of the yarn guide unit also corresponds to the position in which the yarn or the center of the yarn guide unit is aligned with the discharge tube of the workstation. As a result, re-setting of the yarn when a yarn break is present can be simplified, as there is no need to pay attention to a lateral offset between the yarn guide unit and the withdrawal tube.

Moreover, it is advantageous if, for positioning the yarn guide unit at the workstation, a position of the conversion element is detected by means of the sensor. As a result, the sensor, which is preferably designed as a Hall sensor, can be arranged in the region of the conversion element, so that the construction of the traversing unit is simplified.

According to another embodiment of the invention, it is advantageous if a speed profile for the single traction drive is specified and the traversing drive is driven according to the predetermined speed profile. In this case, it is again advantageous if the speed profile is specified for a complete revolution and the single-axis traction drive departs the speed profile for each revolution. If the speed of the drive is varied in such a way that the residence time of the thread at each point of the contact line between the two rolls of the pair of delivery rollers is approximately the same, a very uniform wear of the take-off roller pair, in particular the pressure roller of the take-off roller pair, can be achieved.

Figur 1

eine schematischen Seitenansicht einer Arbeitsstelle mit einer Changiereinheit und

Figur 2

eine Draufsicht auf einen Ausschnitt der Changiereinheit.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIG. 1

a schematic side view of a job with a traversing unit and

FIG. 2

a plan view of a section of the traversing unit.

FIG. 1 shows a schematic side view of a job 2 a textile machine with a traversing unit 1. In the workplace 2, a yarn 3 is supplied by a delivery unit 4 and wound on a spool 10. In the exemplary embodiment shown here, the yarn 3 is formed by the delivery unit 4. The delivery unit 4 is in this embodiment, a rotor spinning unit, but could also be an air spinning unit, other spinning unit or a delivery reel of a winder.

In order to form the yarn 3, the delivery unit 4 comprises a dissolving unit 6, which forms individual fibers 7 from a sliver 5. The fibers 7 are guided in a rotor 8, which generates the yarn 3. The yarn 3 is withdrawn with the aid of a pair of take-off rollers 9 from a take-off tube 19 of the delivery unit 4. The yarn 3 is finally wound on the spool 10. The spool 10 is driven by a winding roller 11.

In order to prevent a cutting of the yarn 3 in the take-off roller pair 9, the yarn 3 is changeable by means of the traversing unit 1. The yarn 3 is thereby during its withdrawal in a wider area with the lateral surfaces of the take-off rolls of the take-off roller pair 9 in contact whereby the cutting is prevented.

The traversing unit 1 comprises a traversing single drive 13, which drives a yarn guiding unit 12. The yarn guide unit 12 is in this embodiment by means of a holder 17 on a guide 16 in an axial direction X (see Fig. 2 , not visible here) of the take-off roller pair 9 displaceable. In the present case, furthermore, the yarn guiding unit 12 is connected to a cutting / blowing unit 20 and a measuring unit 21. This is according to FIG. 1 downstream of the cutting / blowing unit 20 in the flow direction F of the yarn 3. With the aid of the measuring unit 21, the yarn quality can be monitored or, by means of the measuring unit 21, yarn defects can be detected. Furthermore, the traversing unit 1 includes a sensor 18.

By the displacement of the yarn guide unit 12 along the axial direction X of the take-off roller pair 9, a linear reciprocating motion, a traversing movement C, can be formed by means of which the cutting of the yarn can be prevented. The traversing movement C is in FIG. 1 oriented perpendicular to the plane and therefore not designated here.

The operation of the traversing unit 1 will now be in connection with FIG. 2 described, which shows a plan view of a section of the traversing unit 1. The traversing unit 1 includes in addition to the already Fig. 1 components described a conversion element 14, by means of which a rotational movement ω of the traversing single drive 13 in the linear reciprocating motion, the traversing movement C, is implemented.

The Changiereinzelantrieb 13 is designed as a rotating motor. Such revolving motors are also known as rotary motors and, in contrast to reversing motors, have only one direction of rotation, which in the present exemplary embodiment is the direction of rotation ω. As a result, the traversing individual drive 13 can be constructed and controlled more simply. A reversal of the direction of rotation of the traction drive 13, when the traversing movement C is to be reversed, is therefore not necessary.

By means of the sensor 18, at least one center position M of the yarn feeding unit 12 can be detected, whereby, for example, it can be detected whether the yarn feeding unit 12 is aligned with the rotor 8 and the take-off tube 19, respectively. The center position M of the yarn guide unit 12 in this case is the position in which the yarn guide unit 12 is aligned with the Abzugsröhrchen 19 is. As a result, in the event of a yarn break, the yarn guiding unit 12 can be moved to the middle position M and thus be aligned in alignment with the withdrawal tube 19. The piecing or splicing of the yarn is thereby facilitated because the yarn end is in a defined position relative to the delivery unit 4, from which it can be returned to the delivery unit, in the present case in the withdrawal tube 19.

The Garnführeinheit 12 can advantageously, as already to FIG. 1 described, comprise a cutting unit and / or a blowing unit. In this embodiment, these two units are combined to form a cutting / blowing unit 20. By means of the cutting unit of the cutting / blowing unit 20, for example, at a delivery stop of the yarn 3, this can be separated to obtain a defined yarn end. In addition, a yarn error can be removed with the cutting unit. With the aid of the blowing unit of the cutting / blowing unit 20, the yarn end and / or the yarn 3 can be blown into the draw-off tube 19 or into the rotor 8. Therefore, it is important that the cutting / blowing unit 20 of the yarn guide unit 12 is aligned with the exhaust pipe 19. As a result, the blowing of the yarn 3 is simplified.

Furthermore, in FIG. 2 the conversion element 14 recognizable. The conversion element 14 is formed in this embodiment as an eccentric element, in particular as an eccentric disc. The conversion element 14 is rotatable about a pivot point 15 and is driven by the traversing single drive 13, so that the transfer element 14 is set in the rotational movement ω.

The conversion element 14 cooperates with at least one guide element 22a, 22b, which are formed in this embodiment as two parallel guide edges. The transfer element 14 is guided between the guide elements 22a, 22b. Alternatively, the guide elements 22a, 22b may also be formed, for example, as a slot. Due to the interaction between the transfer element 14 and the guide elements 22a, 22b, the holder 17 can be placed on the guide 16 in the traversing movement C, so that the yarn 3 along the axial direction X of the pair of delivery rollers 9, which is shown here only schematically, is changeable , The traversing movement C is aligned parallel to the axial direction X of the take-off roller pair 9.

The yarn guide unit 12 is located in the in FIG. 2 shown embodiment in a center position M. The eccentric is in the center position M, the sensor 18 with its bulbous side, which is referred to here as Exzenterbauch 23, facing. Alternatively, in the center position M, the eccentric disk can also be arranged turned by 180 ° so that in the center position the thinner side of the eccentric element, which is referred to here as the eccentric back 24, faces the sensor 18.

To form the traversing movement C, for example, as shown in this embodiment, the transfer element 14, here the eccentric disc, by means of the traversing drive 13 in the in FIG. 2 shown direction of rotation ω are rotated about the pivot point 15. As a result, the eccentric belly 23 is rotated in the direction of the guide element 22a. The eccentric 24 is, however, rotated in the direction of the guide member 22b. The eccentric belly 23 pushes the guide element 22a away, so that the holder 17 with the Garnführeinheit 12 according to FIG. 2 moves to the left. When the eccentric disc is 90 ° opposite the in FIG. 2 shown orientation has continued to move in accordance with the rotational movement ω, the maximum deflection of the bracket 17 and the yarn guide unit 12 after the first page, here the left side achieved. In a further rotation of the eccentric disk, the holder 17 is back, according to FIG. 2 to the right, shifted until the eccentric 23 has arrived at the guide element 22b. There, the holder 17 according to the maximum deflection FIG. 2 reached to the right. This allows the traversing C with a permanently rotating rotational movement of the traversing individual drive 13 are formed in a single direction of rotation. The individual traversing drive 13 can be made particularly simple and complicated control of the traversing drive 13 is thereby avoided.

In order to be able to detect a position of the conversion element 14, a sensor 18 is arranged adjacent to it. The sensor 18 may be formed as a Hall sensor to measure the position of the Umsetzelements 14 contactless. In the region of the eccentric abdomen 23, the conversion element 14 has for this purpose a magnetic element 25 which serves as a measuring point for the Hall sensor. Of course, the magnetic element 25 could also be provided in the region of the eccentric back 24 or at any other location. It is only essential that during assembly of the traversing device, the transfer element 14 and the Garnführeinheit 12 are positioned in relation to each other so that in the center position of the yarn guide unit 12, the magnetic element 25 faces the sensor 18. Depending on the design of the sensor 18 and the Umsetzelements 14, it would also be conceivable that the sensor 18 detects only the Exzenterbauch 23 or -rücken 24 as such or a special recess or other identification of the Umsetzelements 14.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are möglic.

LIST OF REFERENCE NUMBERS

1

Traversing unit

2

place of work

3

yarn

4

delivery unit

5

sliver

6

opening unit

7

fibers

8th

rotor

9

Off rollers

10

Kitchen sink

11

winding roller

12

Garnführeinheit

13

Traversing single drive

14

conversion element

15

pivot point

16

guide

17

bracket

18

sensor

19

draw-off tube

20

Cutting / blowing unit

21

measuring unit

22

guide element

23

Exzenterbauch

24

Exzenterrücken

25

magnetic element

C

Oscillating movement

ω

rotary motion

X

axially

F

Flow direction of the yarn

M

center position

Claims (14)

1. A traversing unit (1) for traversing a yarn (3) with respect to a pair of delivery rollers (9) of a workstation (2) of a textile machine, comprising a yarn-guiding unit (12), comprising a single traversing drive (13) for driving the yarn-guiding unit (12), and comprising a conversion element (14), with the aid of which a rotational movement (ω) of the single traversing drive (13) can be converted into a linear, reciprocating movement of the yarn-guiding unit (12),
   characterized in that the single traversing drive (13) is designed as a rotating motor and at least a middle position (M) of the yarn-guiding unit (12) can be detected with the aid of a sensor (18).
2. The traversing unit as claimed in the preceding claim, characterized in that the conversion element (14) comprises an eccentric element, which interacts with at least one guide element (22a, 22b), wherein preferably the at least one guide element (22a, 22b) is provided on the yarn-guiding unit (12).
3. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the at least one guide element (22a, 22b) of the yarn-guiding unit (12) comprises two, in particular parallel, guide edges, between which the eccentric element is guided.
4. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the sensor (18) is situated adjacent to the conversion element (14), in particular, the eccentric element.
5. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the sensor (18) is a Hall sensor and/or the conversion element (14), in particular, the eccentric element, comprises a magnetic element (25).
6. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the yarn-guiding unit (12) comprises a cutting and/or blowing unit (20), with the aid of which the yarn (3) can be cut and/or a yarn end can be blown into the workstation (2).
7. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the yarn-guiding unit (12) comprises a measuring unit (21), with the aid of which a condition of the yarn (3) can be recognized, wherein, preferably, the measuring unit (21) is installed downstream from the cutting and/or blowing unit (20) in the flow direction of the yarn (3).
8. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the single traversing drive (13) is fixedly situated at the workstation (2) and the at least one guide element (22a, 22b) is displaceable with respect to the workstation (2) with the aid of the eccentric element.
9. The traversing unit as claimed in at least one of the preceding claims,
   characterized in that the sensor (18) and/or the conversion element (14) is/are situated on the traversing unit (1) in such a way that at least one aligned position of the yarn-guiding unit (12) with respect to an draw-off tube (19) of the workstation (2) is detectable.
10. A workstation (2) of a textile machine comprising a traversing unit (1), which is designed according to one or several of the preceding claims.
11. A method for operating a traversing unit (1) of a workstation (2) of a textile machine, wherein the traversing unit (1) is designed, in particular, according to one or several of the preceding claims, in which a moving yarn (3) is guided in a yarn-guiding unit (12) of the traversing unit (1) and in which the yarn-guiding unit (12) is moved linearly back and forth with the aid of a single traversing drive (13) and a conversion element (14) in order to traverse the yarn (3) with respect to a pair of delivery rollers (9) of the workstation (2), characterized in that the single traversing drive (13) is operated as a rotating motor and at least a middle position (M) of the yarn-guiding unit (12) is detected with the aid of a sensor (18).
12. The method as claimed in the preceding claim, characterized in that , during an interruption of the moving yarn (3), the yarn-guiding unit (12) is positioned at the workstation (2) in such a way that the yarn-guiding unit (12) is aligned with a draw-off tube (19) of the workstation (2).
13. The method as claimed in one of the preceding method claims,
    characterized in that a position of the conversion element (14) is detected with the aid of the sensor (18) in order to position the yarn-guiding unit (12) on the workstation (2).
14. The method as claimed in one of the preceding method claims,
    characterized in that a speed profile is predefined for the single traversing drive (13) and the single traversing drive (13) is driven according to the predefined speed profile.

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