CN110540104A

CN110540104A - Method and drawing device for pressing a reel onto a winding roller

Info

Publication number: CN110540104A
Application number: CN201910452896.XA
Authority: CN
Inventors: B·巴尔曼; R·波赫; M·马莱克; T·格鲁伯
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2018-05-29
Filing date: 2019-05-28
Publication date: 2019-12-06
Also published as: DE102018112796A1; JP2019206437A; EP3575254A1

Abstract

In a method for pressing a reel onto a winding roller in a working position of a textile machine by means of a pressing device, the pressing device comprises a spring element that can be pretensioned for pressing the reel onto the winding roller. In this case, a desired pretensioning of the pretensionable spring element or an adjustment parameter which is indicative of the desired pretensioning is preset, and the pretensioning of the spring element is adjusted according to the preset desired pretensioning. A winding device for a working position of a textile machine has a winding roller and a winding drum which can be pressed onto the winding roller, and a pressing device. The pressing device comprises a pretensioned spring element for pressing the winding drum onto the winding roller. The pressing device furthermore comprises an adjusting element, in particular an electric motor, which is operatively connected to the spring element and by means of which the spring element can be loaded with a predetermined pretension.

Description

Method and drawing device for pressing a reel onto a winding roller

Technical Field

The invention relates to a method for pressing a winding drum onto a winding roller by means of a pressing device in a working position of a textile machine. The invention also relates to a corresponding winding device having a winding roller and a winding drum that can be pressed onto the winding roller, and a pressing device.

Background

Winding devices are known in the prior art in different embodiments. For example, it is known in open-end spinning machines to press the winding drum onto the winding roller by means of pneumatic cylinders. In conventional open-end spinning machines, the pressure of the air cylinder can generally be set centrally for all operating positions on a pressure regulating valve in order to adapt the pressing force. Individual adjustment for each working position is therefore not possible.

A spinning machine is known from DE 19534333B 4, in which the winding drum is loaded during operation by means of pneumatic cylinders and pressed onto a winding roller. In order to be able to adjust the pressing force of the reel drum on the winding roller still separately, a load-relieving device is provided on the reel frame, which contains a tension spring. An actuating lever for the operator is pivotably connected to the tension spring, so that the direction of action of the spring element on the reel frame and thus the reel contact pressure can be changed.

Disclosure of Invention

The object of the invention is to provide a winding device and a method for extruding a winding drum, which allow a comfortable adjustment of the extrusion force of the winding drum on the winding roller.

This object is achieved by the features of the independent claims.

In a method for pressing a reel onto a winding roller in a working position of a textile machine, the reel is pressed onto the reel by means of a pressing device in the working position. The corresponding winding device has a winding roller and a winding drum which can be pressed onto the winding roller. Furthermore, the winding device has a pressing device.

The pressing device comprises a pretensioned spring element for pressing the winding drum onto the winding roller. In this case, a desired pretensioning of the spring element or an adjustment parameter which is indicative of the desired pretensioning, for example a spring travel, is predetermined, and the pretensioning of the spring element is adjusted as a function of the predetermined desired pretensioning.

For this purpose, the pressing device of the winding device comprises an adjusting element, in particular an electric motor, which is operatively connected to the spring element and by means of which the spring element can be acted upon with a predetermined pretension.

Since the pressing of the winding drum onto the winding roller is effected by means of the pretensioned spring element, it is not necessary, as in the prior art, to continuously load the pressing device with compressed air or current during continuous operation. Therefore, even in the case of a machine with single-station automation (einzelplatz automation), in which a pressing device must be provided at each working position, it is possible to operate the winding device with energy saving. A particularly reliable pressing of the winding drum onto the winding roller can be achieved by the spring element.

In this case, it is particularly advantageous if the pretensioning of the spring element and thus the pressing force of the reel drum on the winding roller can be adjusted at any time by the adjusting element even in continuous operation and individually in each operating position. Likewise, it is also possible to provide as identical conditions as possible in a plurality of working positions of the textile machine. Since the adjustment of the contact pressure is effected directly by changing the pretensioning of the spring element, the adjustment of the contact pressure can also be effected independently of the geometry in the operating position, or the method or the winding device can compensate for the effect of the geometry in the operating position. The reel contact pressure can thus also be freely adjusted at every arbitrary point in the winding process, whereas in the prior art the reel contact pressure always follows a characteristic predetermined by the geometric conditions.

In this case, it is particularly advantageous if the pretensioning of the spring element is set by means of an electric motor of the pressing device. The electric motor can be actuated very finely in order to adjust the pretension of the spring element according to the desired pretension.

In the method, an electric motor for applying a predetermined bias to the spring element is preferably moved in a stroke-controlled manner. The travel path of the electric motor is a measure of the spring path of the spring element and thus of the pretensioning of the spring element.

It is therefore also advantageous if the adjustment parameter which indicates the pretensioning is the travel path of the electric motor. In this case, it is particularly advantageous if the travel path of the electric motor is arranged parallel or coaxially to the direction of action of the spring element, since then the travel path of the electric motor is directly proportional to the pretensioning of the spring element in a linear spring characteristic curve.

According to a particularly advantageous embodiment, the electric motor is a stepper motor, in particular a linear stepper motor, since this linear stepper motor enables a very precise adjustment of the spring pretension depending on the number of steps passed. The actuating variable which represents the pretensioning is advantageously the number of steps of the stepping motor.

In the method, it is furthermore advantageous to adjust the pretensioning in two stages as a function of the preset pretensioning. In this case, in a first phase, the winding drum is applied to the winding roller by means of a pressing device and/or the spring element is operatively connected to the electric motor. The spring element is still fully relaxed in the first phase, and then, in the second phase, the spring element is loaded with a pretension. The spring element is therefore only operatively connected to the electric motor in the second phase, which leads to the pretensioning. This makes it possible to precisely adjust the preset pretension. It is therefore also advantageous in the winding device if the operative connection between the electric motor and the spring element is releasable.

It is also advantageous if it is detected whether the winding drum is in contact with the winding roller and/or whether the spring element is operatively connected to the pressing device. In this way, the beginning of the second phase of the stroke-controlled travel or pretensioning of the spring element of the electric motor can be precisely determined. For this purpose, the winding device preferably has a corresponding detection device. The spring is therefore only preloaded when contact is made between the winding roller and the winding drum, or the stroke-controlled displacement of the electric motor is effected only when the electric motor is actually also in operative connection with the spring element. This prevents incorrect adjustment of the pretensioning of the spring element due to possible backlash of the electric motor, i.e. without a positive connection to the spring element. Likewise, the desired pretensioning force is always achieved without additional adjustment work, even if the winding roller is worn or the diameter of the reel changes.

In order to establish a releasable operative connection between the spring element and the pressing device, in particular the electric motor, it is advantageous if the spring element is arranged in a sleeve which is arranged between the lifting element of the electric motor and the reel arm of the reel. The spring element is preferably designed as a helical spring, but other embodiments are also possible. The lifting element of the electric motor is understood within the scope of the invention to be an element which is designed to perform an axial movement for preloading the spring element. The lifting element can be, for example, a transmission element connected to an electric motor, such as a connecting rod, toothed rod, threaded spindle, etc., or, in the case of a linear motor, a rotor.

In this case, it is particularly advantageous if the sleeve is connected to the lifting element in a movable manner with respect to its axial direction and is fixedly connected to the reel arm. In this case, the displaceability between the sleeve and the lifting element enables the winding drum to be placed on the winding roller in a first phase, and the application of a pretension to the spring element can then be achieved by compression of the spring element in the sleeve in a second phase. However, it is of course also possible for the sleeve to be fixedly connected to the lifting element and to be movably connected to the reel arm.

According to a development, it is advantageous if the preset pretensioning or setting parameter of the spring element decreases with increasing diameter of the drum. This makes it possible to reduce the weight of the reel, which additionally presses the reel against the winding roller.

It is also advantageous to preset the pretensioning of the spring element in such a way that the drum contact pressure remains substantially constant during the winding process of the drum, i.e. in the case of an increase in the drum diameter, so that a drum having constant properties over its diameter can be produced.

It is also particularly advantageous to preset the pretensioning of the spring element and/or a profile of an actuating variable which represents the desired pretensioning, and to actuate the electric motor according to the preset profile. In this case, the curve of change is predetermined in such a way that the pressing force of the mandrel remains constant throughout the winding process, i.e. with increasing mandrel diameter, or, according to an alternative embodiment, changes during the winding process. Thereby possibly having a profound effect on the properties of the reel.

According to a further development of the invention, the reel drum is lifted off the winding roller by means of the pressing device, or in the winding device, the reel drum can be removed from the winding roller by means of the pressing device. In this case, the electric motor is likewise used to lift and return the drum and to preload the spring element.

Drawings

Further advantages of the invention are described in connection with the following examples. Wherein:

Fig. 1 shows a schematic cross-sectional view of a working position of a textile machine in the form of an overview;

Fig. 2 shows a schematic partially sectioned illustration of a winding device, in which the spring element is not prestressed;

Fig. 3 shows a schematic partially sectioned illustration of the winding device from fig. 1, wherein the pretensioning of the spring element has just begun; and is

Fig. 4 shows a schematic partially cut-away illustration of the winding device of fig. 1, wherein the reel is pressed onto the winding roller.

Detailed Description

fig. 1 shows an overview of a working position 2 of a textile machine 1 in a schematic sectional view. The textile machine 1 is currently designed as a spinning machine and has, in a conventional manner, a spinning element 8, here a spinning rotor, to which the fibrous material 7 is fed. In the spinning element 8, the fiber material 7 is spun into a yarn 4 and drawn off by means of the drawing device 3. If necessary, after the pulling device 3, the thread 4 is passed through further elements such as mass sensors or waxing devices and finally wound onto a reel 9 by means of a winding device 5.

The winding device 5 comprises a winding roller 10, which is mounted in a fixed manner in a manner known per se and can be driven at a winding roller speed, and a winding drum 9 which can be pressed onto the winding roller 10 and, if appropriate, can also be lifted off the winding roller 10. For pressing the reel 9 onto the winding roller 10, a pressing device 11 is provided, which is only schematically shown in the present case. In such winding devices 5, it is often desirable to implement the pressing force of the reel drum 9 on the winding roller 10 in an adjustable manner, in order to be able to adapt to the actual conditions of the operating position 2.

Fig. 2 shows a schematic illustration of such a winding device 5 with a winding roller 10 and a reel 9, partially cut away. The reel 9 can be pressed onto the winding roller 10 by means of a pressing device 11. In fig. 2, the reel 9 is shown in a position in which it has not yet been pressed onto the winding roller 10. The pressing device 11 currently contains an electric motor 13 as an adjusting element, which is mounted in a working position 2 of the textile machine 1 (not shown here), which working position is only shown schematically and interrupted here. The electric motor 13 has a lifting element 15 which, in operation of the electric motor 13, performs a lifting movement in the direction of the double arrow. The lifting element 15 is connected to a reel arm 16, which is mounted so as to be rotatable about a rotation point 17, and thus bears the reel 9 against the winding roller 10. In the present case, the reel arm 16 is embodied as a two-arm lever, wherein the reel 9 is supported on a first lever arm and a second lever arm is connected to the electric motor 13 of the pressing device 11. However, it is of course also conceivable to embody the reel arm 16 as a single-arm lever.

The lifting element 15 is not connected directly to the drum arm 16, but via the spring element 12. According to the present illustration, the lifting element 15 is connected to a spring bracket 18, which is arranged in the sleeve 14 in a movable manner. The sleeve 14 is in turn fixedly, but according to the present example, connected in a swingable manner to the reel arm 16. Likewise, according to the present illustration, the electric motor 13 is also fixedly connected to the textile machine 1 or the working position 2, but in a pivotable manner, in order to be able to effect a change in orientation of the individual components as a result of the lifting movement of the lifting element 15. However, other types of support or connections between the electric motor 13, the sleeve 14 and the reel arm 16 are of course possible.

As can now be seen from the partially cut-away illustration of the sleeve 14, the spring element 12, in this case in the form of a helical spring, is supported in the sleeve 14 and can be prestressed by means of the spring bracket 18 and the lifting element 15 of the electric motor 13. The sleeve 14 is connected to the lifting element 15 so as to be movable via a spring stop 18 with respect 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.

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

Fig. 3 now shows the situation in which the reel 9 rests on the winding roller 10. If the reel 9 has been lifted off the winding roller 10 beforehand by means of the pressing device 11, which is usually required if the winding roller is driven centrally, the reel is transferred into the presently shown position by the travel of the electric motor 13. By the displacement of the electric motor 13, the lifting element 15 and the spring bracket 18 connected thereto are now moved in the direction of the electric motor 13. The movement is transmitted via the spring element 12 and the sleeve 14 to the winding roller arm 16, wherein the winding roller 9 rests against the winding roller 10. The lifting element 15 is now in a partially retracted position in which the spring bracket 18 connected to the lifting element 15 has a second distance from the electric motor 13, which is smaller than the first distance. Here, when the reel 9 reaches the surface of the winding roller 10, it is detected by the winding device 5. For this purpose, the winding device 5 has corresponding detection means. The detection means may be formed, for example, by a proximity switch, a contact switch or by an element of the pressing device 11. It is also conceivable to detect whether the reel 9 has reached abutment with the winding roller 10 by means of the load angle of the electric motor 13, since the load angle of the electric motor 13 is suddenly increased due to the higher mechanical resistance. The detection by the detection of the load angle is particularly advantageous here, since this detection can be carried out sensorless and is a function which is often present in the control of the electric motor.

After the reel 9 has been brought into contact with the winding roller 10, the first phase of setting the desired pretension is ended. As soon as it is detected that the reel 9 is resting on the winding roller 10, the spring element 12 is then loaded with a pretension in the second phase.

However, it is also conceivable to detect the loading of the spring element 12 directly instead of detecting the abutment of the reel drum 9 on the winding roller 10. The spring element 12 resting against the spring stop 18 can be arranged in the sleeve 14 in such a way that it has an axial play in the sleeve 14. Thus, when the lifting element 15 is moved, it first passes through a free path, wherein the spring element 12 remains relaxed. The second phase of setting the desired pretension, in which the spring element 12 is actually loaded with the pretension, only begins when the spring element 12 reaches the end face of the sleeve 14 opposite the spring stop 18 and thus a functional connection is established between the spring element 12 and the electric motor 13. The detection can take place in various ways as described above, but preferably takes place 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 reel 9 does not have to be lifted off the winding roller 10, which usually occurs with a single drive of the winding roller.

Fig. 4 now shows the spring element 12 being loaded with a preload. As can be gathered from fig. 4, the winding roller 10 now forms a stop for the winding drum 9, so that no further feed movement is possible in this position, or according to an alternative embodiment, the sleeve 14 forms a stop for the spring element 12. Now, further travel of the electric motor 13 or the lifting element 15 can only be effected against the restoring force of the spring element 12. As a result, a functional connection is established between the spring element 12 of the pressing device 11 and the electric motor 13, since the winding drum 9 is stopped on the winding roller 10 or the spring element 12 is stopped on the sleeve 4. As a result, a pretension can now be applied to the spring element 12 with further travel of the electric motor 13 or the lifting element 15. Since the electric motor 13 is moved in a controlled manner during this second phase, the movement path of the lifting element 15 and thus the pretensioning of the spring element 12, which is proportional to the movement path of the lifting element 15, can be set very precisely.

By providing the pressing device 11 with a spring element 12 that can be loaded with a specific pretension, it is possible to precisely adjust the desired pressing force of the mandrel 9 in the operating position 2. It is particularly advantageous here if the winding device 5 shown makes it possible to adjust the pressing force individually in each operating position 2 of the textile machine 1, so that a multi-part occupation of the textile machine 1 can also be achieved without problems. It is likewise possible to take into account the actual conditions at the individual working positions 2. It is also within the scope of the invention to load the reels 9 of a plurality of operating positions 2 by means of a central reel load device (not shown) and to carry out only a fine adjustment of the pressing force by means of a pressing device 11 arranged at each individual operating position.

The invention is not limited to the embodiments shown and described. Modifications are likewise possible within the scope of the claims, such as combinations of features, even when these features are shown and described in different embodiments.

List of reference numerals

1 textile machine

2 working position

3 pulling apparatus

4 yarn

5 winding apparatus

7 fiber material

8 spinning element

9 winding drum

10 winding roller

11 extrusion device

12 spring element

13 electric motor

14 sleeve

15 lifting element

16 reel arm

17 operating the pivot point of the lever

18 spring baffle

Claims

1. A method for pressing a reel (9) onto a winding roller (10) in a working position (2) of a textile machine (1) by means of a pressing device (11), characterized in that the pressing device (11) comprises a pretensioned spring element (12) for pressing the reel (9) onto the winding roller (10), and in that a desired pretension of the spring element (12) or an adjustment parameter which is indicative of the desired pretension is preset, and in that the pretension of the spring element (12) is adjusted in accordance with the preset desired pretension.

2. Method according to the preceding claim, characterized in that the pretension of the spring element (12) is adjusted by means of an electric motor (13) of the pressing device (11).

3. Method according to one of the preceding claims, characterized in that the electric motor (13), in particular a stepping motor, in particular a linear stepping motor, is moved stroke-controlled for loading the spring element (12) with a preset pretension.

4. Method according to one of the preceding claims, characterized in that the pretension is adjusted in two phases as a function of a preset pretension, wherein in a first phase the reel (9) is placed against the winding roller (10) by means of the pressing device (11) and/or the spring element (12) is operatively connected to the electric motor (13), wherein in a first phase the spring element is completely relaxed and in a second phase the spring element (12) is loaded with the pretension.

5. Method according to any one of the preceding claims, characterized in that the adjustment parameter representing the pretension is the travel of the electric motor (13), in particular the number of steps of a stepper motor.

6. Method according to any one of the preceding claims, characterized in that it is detected, preferably sensorless, whether the reel drum (9) is resting on the winding roller (10) and/or whether the spring element (12) is operatively connected to the electric motor (13).

7. method according to any one of the preceding claims, characterized in that the preset pretension of the spring element (12) decreases with increasing diameter of the drum (9).

8. Method according to any one of the preceding claims, characterized in that the pretension of the spring element (12) is preset in such a way that the drum contact pressure remains substantially constant in the case of an increase in the drum diameter.

9. Method according to one of the preceding claims, characterized in that a variation curve of the pretension of the spring element (12) and/or of an adjustment parameter representing a desired pretension is preset and the electric motor (13) is controlled as a function of the preset variation curve.

10. Method according to any one of the preceding claims, characterized in that the reel drum (9) is lifted off the winding roller (10) by means of the pressing device (11).

11. A winding device (5) for a working position (2) of a textile machine (1), in particular for carrying out a method according to one of the preceding claims, having a winding roller (10) and a reel (9) which can be pressed onto the winding roller (10), and having a pressing device (11), characterized in that the pressing device (11) contains a pretensioned spring element (12) for pressing the reel (9) onto the winding roller (10), and in that the pressing device (11) comprises an adjusting element, in particular an electric motor (13), which is operatively connected to the spring element (12), and by means of which the spring element (12) can be loaded with a preset pretension.

12. Winding device (5) according to the preceding claim, characterized in that the electric motor (13) is a stepper motor, in particular a linear stepper motor.

13. Spooling apparatus (5) as claimed in any of the preceding apparatus claims, characterized in that the functional connection is releasable.

14. Winding device (5) according to one of the preceding device claims, characterized in that the winding device (5) has a detection device, preferably a sensor-free detection device, by means of which it can be detected whether the winding drum (9) is resting on the winding roller (10) and/or whether the spring element (12) is operatively connected to the pressing device (11).

15. Spooling apparatus (5) as claimed in any of the preceding apparatus claims, characterized in that the spring element (12) is arranged tensionably in a sleeve (14) which is provided between a lifting element (15) of the electric motor (13) and a reel arm (16) of the reel (9).

16. Winding device (5) according to any of the preceding device claims, characterized in that the reel drum (9) can be lifted off the winding roller (10) by means of the pressing device (11).