EP3575254A1 - Method for affixing a coil to a coil roller and draw-off device - Google Patents

Abstract

In a method for pressing a coil (9) on a winding roller (10) at a workstation (2) of a textile machine (1) by means of a contact pressure device (11), the contact pressure device (11) for pressing the coil (9) to the winding roller ( 10) a prestressable spring element (12). In this case, a desired bias of the prestressable spring element (12) or a desired bias voltage representing setting parameter is specified and set the bias of the spring element (12) corresponding to the predetermined, desired bias. A winding device (5) for a workstation (2) of a textile machine (1) has a winding roller (10) and a coil (9) which can be pressed against the winding roller (10) and a pressure device (11). The pressing device (11) includes for pressing the coil (9) to the winding roller (10) a prestressable spring element (12). Furthermore, the contact pressure device (11) comprises an actuating element, in particular an electric motor (13), which is in operative connection with the spring element (12) and by means of which the spring element (12) can be acted on with a predetermined bias voltage.

Description

The present invention relates to a method for pressing a coil on a winding roller at a workstation of a textile machine by means of a pressing device. Furthermore, the invention relates to a corresponding winding device with a winding roller and a contactable to the winding roller coil and a pressing device.

Winding devices have become known in the prior art in various embodiments. For example, it has become known in open-end spinning machines to press the coil by means of a pneumatic cylinder to the winding roller. In conventional open-end spinning machines, the pressure of the cylinders is generally adjustable centrally for all workstations on a pressure regulating valve in order to make adjustments to the contact pressure. An individual setting per job is therefore not possible.

From the DE 195 34 333 B4 is a spinning machine has become known, in which the coil is acted upon in operation with a pneumatic cylinder and is pressed against the winding roller. In order to adjust the contact pressure of the spool to the winding roller yet individually, a relief device is provided on the coil frame, which includes a tension spring. With the tension spring, an adjustment lever for an operator is pivotally connected, so that the direction of attack of the spring element on the creel can be changed and thereby the coil contact pressure can be changed.

Object of the present invention is to provide a winding device and a method for pressing a coil, which allow a comfortable adjustment of the contact pressure of the coil to the winding roller.

The object is solved with the features of the independent claims.

In a method for pressing a coil on a winding roller at a workstation of a textile machine, the coil is pressed by means of a pressing device of the job to the coil. A corresponding winding device has a winding roller and a coil which can be pressed against the winding roller. Furthermore, the winding device on a pressing device.

The pressing device comprises for pressing the coil to the winding roller a prestressable spring element. In this case, a desired bias of the spring element or a desired bias voltage representing setting parameters, such as a spring travel, given and the bias of the spring element is adjusted according to the predetermined, desired bias.

For this purpose, the pressing device of the winding device comprises an adjusting element, in particular an electric motor, which is in operative connection with the spring element and by means of which the spring element can be acted upon by a predetermined bias voltage.

Characterized in that the pressing of the coil to the winding roller takes place by means of a prestressed spring element, it is not necessary as in the prior art to constantly apply the pressure device during operation with compressed air or electricity. It is thus possible to operate the winding devices energy-saving even in a machine with single-station automation, in which a pressing device must be provided at each workstation. By the spring element, a particularly reliable contact pressure of the coil can be achieved at the winding roller. It is particularly advantageous that is adjustable by the adjusting element, the bias of the spring element and thus the contact pressure of the coil to the winding roller at any time during operation and individually per workstation.

Likewise, largely identical conditions can be created at several workstations of a textile machine. The fact that the adjustment of the contact pressure is effected directly by the change in the bias of the spring element, the adjustment of the contact pressure can also be independent of the geometric conditions at the workplace or are the method or the winding device capable of influences of geometric conditions on the Compensate jobs. As a result, the coil contact pressure can also be freely adjusted at any time during the winding cycle, whereas in the prior art the coil contact pressure always follows a characteristic given by geometrical conditions.

It is particularly advantageous if the bias of the spring element is adjusted by means of an electric motor of the pressing device. This can be controlled very finely to adjust the bias of the spring element according to the desired bias.

In the method, the electric motor for applying the spring element with the predetermined bias is preferably moved away. The travel of the electric motor is a measure of the spring travel of the spring element and thus for the bias of the spring element.

Therefore, it is also advantageous if the adjustment parameter representing the preload is a travel path of the electric motor. It is particularly advantageous if the travel of the electric motor is arranged parallel or coaxial with a direction of action of the spring element, since then the travel of the electric motor with a linear spring characteristic is directly proportional to the bias of the spring element.

According to a particularly advantageous embodiment of the electric motor is a stepping motor, in particular a linear stepping motor, since this is a very accurate adjustment of the spring preload corresponding to the traveled Number of steps allows. The adjustment parameter representing the bias is advantageously a number of steps of the stepping motor.

In the method, it is also advantageous if the setting of the bias voltage corresponding to the predetermined bias in two phases. In a first phase while the coil is brought by the contact pressure device in contact with the winding roller and / or brought the spring element in operative connection with the electric motor. The spring element is still completely relaxed in the first phase. In the second phase, the spring element is then subjected to the bias voltage. The spring element is therefore only in the second phase in a bias effecting effective connection with the electric motor. This makes it possible to set the predetermined bias exactly. In the winding device, it is therefore also advantageous if the operative connection between the electric motor and the spring element is releasable.

It is also advantageous if it is detected whether the coil rests against the winding roller and / or whether the spring element is in operative connection with the pressing device. The beginning of the second phase of the path-controlled method of the electric motor or the biasing of the spring element can thereby be determined exactly. For this purpose, the winding device preferably has a corresponding detection device. The spring is thus set under pressure upon reaching a contact between the winding roller and the coil or takes place the path-controlled method of the electric motor only when it is actually in operative connection with the spring element. Faulty settings of the bias of the spring element due to a possible idle travel of the electric motor, ie, without operative connection with the spring element, can be avoided thereby. Likewise, even with wear of the winding roller or diameter changes of the coil without further adjustments always the desired biasing force is achieved.

In order to produce the detachable operative connection between the spring element and the pressing device, in particular the electric motor, it is advantageous if the spring element is arranged clampable in a sleeve which is provided between a lifting element of the electric motor and a Spularm the coil. The spring element is preferably designed as a spiral spring, but other embodiments would also be possible. Under the lifting element of the electric motor is understood in the context of the present invention, the element which performs an axial movement for biasing the spring element. It may, for example, be a transmission element connected to the electric motor, such as a connecting rod, a rack, a threaded spindle or the like, or in the case of a linear motor, the rotor.

It is particularly advantageous if the sleeve relative to its axial direction is displaceable with the lifting element and fixed to the Spularmverbunden. In this case, the displaceability between the sleeve and the lifting element in the first phase allows the application of the coil to the winding roller and then by compressing the spring element in the sleeve in the second phase, the application of the bias to the spring element. Of course, it would also be possible to firmly connect the sleeve with the lifting element and displaceable with the Spularm.

According to a development, it is advantageous if the predetermined bias of the spring element or the adjustment parameters is reduced with increasing diameter of the coil. The increasing weight of the coil, which additionally presses the coil against the winding roller, can be reduced thereby.

In addition, it is advantageous if the bias of the spring element is predetermined such that the coil contact pressure during a winding travel of the coil, ie with increasing coil diameter, remains largely the same, so that coils can be produced with constant properties over their diameter.

It is also particularly advantageous if a course of the pretensioning of the spring element and / or of the setting parameter representing the desired preload is predetermined and the electric motor is driven in accordance with the predetermined course. The course can be specified so that the contact pressure of the coil over the entire winding cycle, ie with increasing coil diameter, remains constant or changed in an alternative embodiment over the winding cycle. As a result, far-reaching influences on the properties of the coils are possible.

According to another embodiment of the invention, the coil is lifted by means of the pressing device of the winding roller or in the winding device, the coil by means of the pressing device of the winding roller can be lifted. The electric motor is used in this case equally for lifting and resetting the coil and for biasing the spring element.

Figur 1

eine schematische Schnittdarstellung einer Arbeitsstelle einer Textilmaschine in einer Übersichtsdarstellung,

Figur 2

eine schematische, teilgeschnittene Darstellung einer Spulvorrichtung, bei welcher das Federelement nicht vorgespannt ist,

Figur 3

eine schematische, teilgeschnittene Darstellung der Spulvorrichtung der Figur 1, bei welcher das Vorspannen des Federelements gerade beginnt, sowie

Figur 4

eine schematische, teilgeschnittene Darstellung der Spulvorrichtung der Figur 1, bei welcher die Spule an die Spulwalze angepresst wird.

Further advantages of the invention will be described with reference to the following embodiments. Show it:

FIG. 1

a schematic sectional view of a workstation of a textile machine in an overview,

FIG. 2

a schematic, partially sectioned view of a winding device, wherein the spring element is not biased,

FIG. 3

a schematic, partially sectional view of the winding device of FIG. 1 in which the biasing of the spring element just starts, as well

FIG. 4

a schematic, partially sectional view of the winding device of FIG. 1 , in which the coil is pressed against the winding roller.

FIG. 1 shows an overview of a workstation 2 a textile machine 1 in a schematic sectional view. The textile machine 1 is presently designed as a spinning machine and has in the usual way a spinning element 8, here a spinning rotor, on which a fiber material 7 is supplied. In the spinning element 8, the fiber material 7 is spun into a thread 4 and withdrawn by means of a take-off device 3. After the take-off device 3, the thread 4 optionally passes through further elements, such as a quality sensor or a paraffining device and is finally wound on a spool 9 by means of a winding device 5.

The winding device 5 includes in a conventional manner a fixedly mounted, driven with a winding roll speed winding roller 10, and one can be pressed against the winding roller 10 and optionally liftable from the winding roller 10 coil 9. For pressing the coil 9 to the winding roller 10 a pressing device 11 is provided, which in the present case is shown only schematically. In such winder 5, it is often desirable to perform the contact force of the coil 9 to the winding roller 10 adjustable to allow adaptation to conditions of the job 2.

FIG. 2 shows a partially sectioned, schematic representation of such a winding device 5 with a winding roller 10 and a coil 9. The coil 9 can be pressed by means of a pressing device 11 to the winding roller 10. In FIG. 2 In this case, the coil 9 is shown in a position in which it is not pressed against the winding roller 10. In the present case, the contact pressure device 11 includes as an actuating element an electric motor 13 which is mounted on the workstation 2, which is shown here only schematically and broken off, of the textile machine 1 (not shown here). The electric motor 13 has a Lifting element 15, which performs a lifting movement in the direction of the double arrow when operating the electric motor 13. The lifting element 15 is connected to a Spularm 16 which is rotatably mounted about a pivot point 17, and thereby applies the coil 9 to the winding roller 10 at. In the present case the Spularm 16 is designed as a two-armed lever, wherein the coil 9 is mounted on a first lever arm and the second lever arm is connected to the electric motor 13 of the pressing device 11. But it would of course also conceivable to execute the Spularm 16 as a one-armed lever.

The lifting element 15 is not directly connected to the Spularm 16, but via a spring element 12. The lifting element 15 is connected according to the present illustration with a spring plate 18 which is slidably disposed in a sleeve 14. The sleeve 14 is in turn fixed, but according to the present example, pivotally connected to the Spularm 16. Likewise, according to the present illustration, the electric motor 13 is fixed, but pivotally connected to the textile machine 1 or the workstation 2, to allow the resultant by the lifting movement of the lifting element 15 changes in position of the individual components. Of course, other types of storage or connections between the electric motor 13, the sleeve 14 and the Spularm 16 are possible.

As can be seen now by the partially sectioned view of the sleeve 14, the spring element 12, here in the form of a spiral spring, is supported on the sleeve 14 and can be acted upon by the spring plate 18 and the lifting element 15 of the electric motor 13 with a bias voltage. The sleeve 14 is related to its axial direction, which in the present case corresponds to the direction of the double arrow and is determined by the central longitudinal axis of the cylindrical body of the sleeve 14, slidably connected via the spring plate 18 with the lifting element 15.

In the present illustration, the lifting element 15 is in an extended position, in which the spring plate 18 connected to the lifting element 15 has a first distance from the electric motor 13.

In FIG. 3 Now a situation is shown in which the coil 9 rests on the winding roller 10. If the bobbin 9 had previously been lifted off from the winding roller 10 by means of the pressing device 11, which is generally required in the case of centrally driven winding rollers, it was transferred by the method of the electric motor 13 into the position shown here. By moving the electric motor 13 now move the lifting element 15 and the associated spring plate 18 in the direction of the electric motor 13. This movement is transmitted via the spring element 12 and the sleeve 14 on the Spularm 16, wherein the coil 9 in contact with the winding roller 10 is brought. The lifting element 15 is now in a partially retracted position, in which the spring plate 18 connected to the lifting element 15 has a second distance to the electric motor 13, which is smaller than the first distance. It is detected by the winding device 5 when the coil 9 has reached the surface of the winding roller 10. The winding device 5 has for this purpose a corresponding detection device. The detection device can be formed for example by a proximity switch, a contact switch or by elements of the pressing device 11. It is also conceivable that is detected on the basis of a load angle of the electric motor 13, whether the coil 9 has come into contact with the winding roller 10, since due to the then higher mechanical resistance of the load angle of the electric motor 13 increases suddenly. The detection by the detection of the load angle is particularly advantageous because it can be done sensorless and often represents a function already present in the control of the electric motor anyway.

After the coil 9 has been brought into abutment with the winding roller 10, the first phase of setting the desired bias voltage is completed. As soon as now the concerns of the coil 9 is detected on the winding roller 10, the spring element 12 is biased in the second phase.

It is also conceivable, however, to detect the loading of the spring element 12 directly instead of the abutment of the coil 9 on the winding roller 10. The resting on the spring plate 18 spring element 12 may be arranged in the sleeve 14 so that it has an axial play in the sleeve 14. When the lifting element 15 is moved, therefore, a free travel is initially covered, with the spring element 12 still remaining relaxed. Only when the spring element 12 reaches the spring plate 18 opposite end face of the sleeve 14 and thus the operative connection between the spring element 12 and the electric motor 13 is made, the second phase of setting the desired bias begins, in which the spring element 12 then actually with a bias is charged. The detection can be carried out in various ways as described above, but preferably by detecting a sudden increase in the load angle, which occurs as soon as the spring element 12 contacts the sleeve. This embodiment is particularly advantageous when the coil 9 does not have to be lifted from the winding roller 10, which is the case for individually driven winding rollers in the rule.

The application of the spring element 12 with the bias voltage is now in FIG. 4 shown. Again FIG. 4 Removable, now forms the winding roller 10 is a stop for the coil 9, so that at this point no further feed movement is possible or forms after the alternative embodiment, the sleeve 14 a stop for the spring element 12.Ein further method of the electric motor 13 and the lifting element 15 is now possible only against the restoring force of the spring element 12. Thus, the active connection between the spring element 12 and the electric motor 13 of the pressing device 11 is produced by abutting the coil 9 on the winding roller 10 and the spring element 13 on the sleeve 14. This can now be in a further method of the electric motor 13 and the lifting element 15 a bias voltage are applied to the spring element 12. Since the electric motor 13 is moved away in this second phase, the travel of the lifting element 15 and thus the bias of the spring element 12, which is proportional to the travel of the lifting element 15, can be set very accurately.

By equipping the pressing device 11 with a spring element 12 which can be acted upon with a specific bias, it is possible to set the desired contact force of the coil 9 at a workstation 2 exactly. It is particularly advantageous in this case that the winding device 5 shown makes it possible to adjust the contact pressure force separately at each workstation 2 of the textile machine 1, so that even a multi-part occupancy of the textile machine 1 is possible without difficulty. It is also possible to take account of conditions at the individual jobs 2. It is also within the scope of the invention to apply the coils 9 of several jobs 2 by means of a central coil loading device (not shown) and to make only fine adjustments of the contact pressure by means of the arranged at each workstation contact pressure devices 11.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as a combination of features, even if they are shown and described in different embodiments.

LIST OF REFERENCE NUMBERS

1

textile machine

2

place of work

3

off device

4

thread

5

spooling device

7

fiber material

8th

spinning element

9

Kitchen sink

10

winding roller

11

pressing device

12

spring element

13

electric motor

14

shell

15

lifting

16

Spularm

17

Fulcrum of the operating lever

18

spring plate

Claims (15)

Method for pressing a coil (9) against a winding roller (10) at a workstation (2) of a textile machine (1) by means of a contact pressure device (11), characterized in that the contact pressure device (11) for pressing the coil (9) against the Winding roller (10) includes a vorspannbares spring element (12) and that a desired bias of the spring element (12) or a desired bias voltage representing setting parameter is specified and the bias of the spring element (12) is adjusted according to the predetermined, desired bias. Method according to the preceding claim, characterized in that the bias of the spring element (12) by means of an electric motor (13) of the pressing device (11) is adjusted. Method according to one of the preceding claims, characterized in that the electric motor (13), in particular a stepper motor, in particular a linear stepping motor, is moved away in a controlled manner for applying the predetermined bias to the spring element (12). Method according to one of the preceding claims, characterized in that the setting of the bias voltage corresponding to the predetermined bias voltage in two phases, wherein in a first phase, the coil (9) by the pressing device (11) is brought into contact with the winding roller (10) and / or the spring element (12) is brought into operative connection with the electric motor (13), wherein the spring element is completely relaxed in the first phase, and that in a second phase, the spring element (12) is subjected to the bias voltage. Method according to one of the preceding claims, characterized in that the adjustment parameter representing the preload is a travel path of the electric motor (13), in particular a step number of the stepping motor. Method according to one of the preceding claims, characterized in that it is detected, preferably sensorless detected, whether the coil (9) on the winding roller (10) and / or whether the spring element (12) with the electric motor (13) is in operative connection , Method according to one of the preceding claims, characterized in that the predetermined bias of the spring element (12) with increasing diameter of the coil (9) is reduced. Method according to one of the preceding claims, characterized in that the bias of the spring element (12) is set such that the coil contact pressure remains largely the same with increasing coil diameter. Method according to one of the preceding claims, characterized in that a course of the bias of the spring element (12) and / or of the desired bias voltage representing setting parameter is specified and the electric motor (13) is driven according to the predetermined course. Method according to one of the preceding claims, characterized in that the coil (9) by means of the pressing device (11) is lifted from the winding roller (10). Winding device (5) for a workstation (2) of a textile machine (1), in particular for carrying out the method according to one of the preceding claims, with a winding roller (10) and one to the Winding roller (10) pressable coil (9) and with a contact pressure device (11), characterized in that the pressing device (11) for pressing the coil (9) to the winding roller (10) includes a prestressable spring element (12) and that the pressing device (11) an adjusting element, in particular an electric motor (13) comprises, which is in operative connection with the spring element (12) and by means of which the spring element (12) can be acted upon by a predetermined bias voltage. Winding device (5) according to the preceding claim, characterized in that the operative connection is releasable. Winding device (5) according to one of the preceding device claims, characterized in that the winding device (5) has a detection device, preferably a sensorless detection device, by means of which is detectable whether the coil (9) on the winding roller (10) and / or whether the spring element (12) with the pressing device (11) is in operative connection. Winding device (5) according to one of the preceding device claims, characterized in that the spring element (12) is arranged clampable in a sleeve (14) which between a lifting element (15) of the electric motor (13) and a Spularm (16) of the coil ( 9) is provided. Winding device (5) according to one of the preceding device claims, characterized in that the coil (9) by means of the pressing device (11) of the winding roller (10) can be lifted.

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