CN117262829A

CN117262829A - Method for changing a lap roller

Info

Publication number: CN117262829A
Application number: CN202310729248.0A
Authority: CN
Inventors: A·施米德; U·斯图茨
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2022-06-20
Filing date: 2023-06-19
Publication date: 2023-12-22
Also published as: EP4296413A1; CH719799A1

Abstract

The invention relates to a device and a method for changing a lap roll in a device for producing a lap roll. The device comprises: a core held in the winding shaft between the two winding disks and having a lap roller which is held on the core and has a lap roller diameter; and an endless belt at least partially surrounding the lap rollers, the belt revolving about a fixed deflection roller, a subsequent opener roller, an ejector roller and a tensioning roller, the opener roller being rotatably mounted on a pivotable opener arm, the ejector roller being rotatably mounted on a pivotable ejector arm, and the tensioning roller being rotatably mounted on a tensioning device. The core is wrapped with a loop of tape which is formed between the deflection roller and the opener roller and which becomes larger as the diameter of the opener roller increases. When a certain diameter of the lap roller is reached, the loop of the belt is opened, the lap roller is ejected via the opening roller, and the belt is kept tensioned during the opening of the loop by adjusting the tensioning device.

Description

Method for changing a lap roller

Technical Field

The invention relates to a device and a method for changing a lap roll in a device for producing a lap roll.

Background

For example, devices of the type in question are known from CH 695 692 A5. The device is used to wind up a fleece (fleece), net or lap made of fibrous material to form a lap roller before the fibrous material is subjected to further processing. Thus, the device can be used, for example, in a combing chamber for receiving a fleece which originates from a drawing frame outlet and is fed via sweeping blades, calender rolls and/or the like, the produced lap rolls being subsequently supplied to the combing machine. Hereinafter, for simplicity, only one web is mentioned in connection with the supplied fibrous material, which will not be understood in a limiting sense. In this case, the annular ring is formed between the two deflection rollers by an endless belt. A core is inserted into the ring. The web is guided to the core by a guide element and formed into a web roll. In this case, the endless belt is guided around the deflection rollers and around the tensioning roller and the further guide roller. When the lap roller is completed, the tensioning roller is released in order to release the belt and thus also the deflection roller. Then, after releasing the lock on the deflection rollers, one of the deflection rollers is guided around the roller so that it is free to be removed from the device. The disadvantage of the disclosed construction and resulting method is that replacing the lap rolls takes a lot of time and, therefore, productivity is low even at high winding speeds.

Disclosure of Invention

It is therefore an object of the present invention to propose a method and an associated device for achieving a rapid replacement of a lap roller.

To achieve this object, a method for replacing a lap roller in an apparatus for producing a lap roller and an associated apparatus are proposed. The device comprises: a core which is held in the winding shaft between the two winding disks and has a lap roller which is held on the core and has a lap roller diameter; and an endless belt wrapped at least partially around the lap roller, the belt revolving around a fixed deflection roller, a subsequent opening roller, an ejector roller, and a tension roller. The opener roller is rotatably mounted on a pivotable opener arm which is held in a winding shaft. The ejector roller is rotatably mounted on a pivotable ejector arm and the tensioning roller is rotatably mounted on the tensioning device. The core for receiving the lap roller is wrapped with a loop of tape which is formed between the deflection roller and the opening roller and which becomes larger as the diameter of the lap roller increases. When a certain diameter of the lap roller is reached, the loop of the belt is opened by an opening movement of the opener arm and at the same time an ejecting movement of the ejector arm is performed, during which opening of the loop the belt is kept tensioned by adjusting the tensioning device and after the end position of the tensioning device has been reached a release movement of the winding disc is performed and the lap roller is ejected via the opener roller. The loop of the belt is opened by the opening movement to such an extent that the opener roller is located below the winding shaft and that it is possible for the opener roller to pop out beyond the opener roller. As a result, after the release movement of the winding disc, the lap roller can be ejected by means of an ejection movement (without further assistance) by means of a variation of the belt tension.

To drive the belt, one of the rollers (e.g., the deflection roller) is provided with an electric drive. As a result of the tension of the belt being maintained during winding of the lap roller, the holding force of the opener arm must be greater than the force of the tensioning device introduced into the belt by means of the tensioning device. In contrast, this simultaneous movement of the opener arm, ejector arm and tensioning device enables a quick opening of the loop, since it is not necessary to wait for the belt to relax before performing the opening movement. In addition, the belt remains entirely in its axial position due to the prevailing tension. Also, during the return to the winding position, the belt is already tensioned before the opener arm is in the end position intended for winding.

As soon as the tensioning roller reaches its end position, the release movement of the winding disc is started. In this case, the ejection movement and the release movement of the winding disc do not wait until the end position of the opener arm is reached, since the continuation of the opening movement after reaching the end position of the tensioning roller leads to a slack in the belt, and this slack can be used for the release movement of the winding disc. After the ejection movement is completed, the lap roller is ejected. Advantageously, the return of the ejector arm may be initiated already during the insertion of the new cartridge.

Preferably, when the deflection roller is fixed, the lap roller is lifted from the belt by the displacement of the ejector roller and the opener roller and runs out of the winding shaft due to gravity. The ejecting movement causes the take-up (belt take-up) between the deflection roller and the opener roller to tighten. Due to the fact that the core of the lap roller is no longer held on the winding shaft after the winding drum is opened, the lap roller is lifted by tightening the belt.

Advantageously, in the open state, the belt is guided with a fixed first guide roller and a fixed second guide roller between the ejector roller and the tension roller, which are arranged outside the revolving belt. The second guide roller is used to maintain the maximum possible wrap angle of the belt in order to maintain the tension roller under each operating condition. Thus, a uniform tension of the belt is achieved. The first guide roller prevents sagging of the tape in a relaxed state of the tape, and thus prevents slippage of the tape in the direction of the winding axis. After ejecting the lap roller, the tape is briefly relaxed until a new core is inserted.

Alternatively, the ejector arm is moved about the axis of the first guide roller by a pneumatic cylinder. As a result of the movement of the lever about the axis of the first guide roller, in the case of a corresponding arrangement of the guide rollers, a ratio of the lever length to the rotation angle can be produced which is favourable for the distance to be achieved by the ejector roller, which ratio results in an advantageous and simple design of the ejector arm.

Preferably, the movements necessary for changing the lap rollers are carried out in three stages. The first stage begins with an opening movement and an ejecting movement, while a tensioning movement is performed to maintain tension in the belt. The first phase ends with the tensioning roller reaching an end position, which corresponds to the maximum possible deflection of the tensioning device. In the second phase, which starts next, the ejecting movement is completed by the ejecting roller, while the opening movement is also ended and the lap roller is ejected. In a first phase, which is started after the end of the winding process, the tensioning roller is moved by the tensioning device in such a way that the belt remains tensioned as long as possible during the opening movement. The opener arm initially opens the loop and the tensioning roller moves accordingly. The opening movement results in a reduced distance being formed by the rollers and extending around the belt. This is counteracted by the movement of the tensioning roller. As soon as the tensioning roller reaches its end position, the ejector roller assumes the function of belt tensioning. The ejection movement ensures that the belt is tensioned in such a way that the lap roller is lifted and ejected.

Preferably, the release movement of the winding disc is performed in the second phase of the opening movement. Opening the winding disc, and thus opening the holder of the lap roller, by a release movement without waiting for the end of the opening movement and the ejection movement, results in time being gained for the whole process of replacing the lap roller. The core is also prevented from seizing in its holder, because the lap roller is lifted after the end position of the tension roller has been reached and a release movement is performed.

After the roll has been ejected, a new core is introduced into the winding shaft and the winding disc is closed, as a result of which the second phase of roll replacement ends. In a later third stage, the opener arm and ejector arm are returned to the winding position and the belt is simultaneously tensioned by the tensioning device. As soon as the core is inserted and the release movement of the winding disc is reversed and thus a new core is clamped in the winding shaft, the ejecting movement, the opening movement and the movement of the tensioning roller can be performed simultaneously. The third phase of the change of the lap roller ends with reaching the end positions of the opener arm and the ejector arm. The ejector roller and the opener roller are in their winding position and a new winding of the lap roller can be started.

In a preferred embodiment of the lap roll replacement, the reversal of the ejection movement is already initiated in the second phase. The return of the ejector arm may have started as soon as the ejector arm reaches the end position and the lap roller is ejected. Since the tape is still loose, insertion of the new cartridge is not disturbed by the start of the return of the ejector arm.

Advantageously, the force acting on the belt by the opening arm is greater than the force acting by the tensioning device. For this purpose, the drives of the tensioning device and the ejector arm are designed accordingly. Preferably, the predetermined tension of the belt introduced by the tensioning device is reduced during the process of replacing the lap roller.

The tensioning device advantageously comprises a tensioning lever and a pneumatic cylinder. An advantage of arranging the tension rod to rotate about the pivot point compared to a linearly operated tensioning device is that a simple installation of the tension rod and the tension roller is possible. In addition, due to the arrangement of the pneumatic cylinders, a high tensioning force can be achieved with the aid of leverage with small cylinders.

Drawings

Further advantages of the present invention are shown and described in more detail in the following examples. In the drawings:

fig. 1 is a schematic view of an apparatus for producing a lap roll according to the present invention in a state where winding starts;

FIG. 2 is a schematic view of the device according to FIG. 1 in the state at the end of winding;

fig. 3 is a schematic view of the device according to fig. 2 in direction X;

FIG. 4 is a schematic view of the apparatus according to FIG. 1 in a state of ejecting a lap roll;

FIG. 5 is a schematic diagram of a motion sequence in a graph, an

Fig. 6 is a schematic diagram of another embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic view of the device according to the invention for producing a lap roll 18 in a state at the beginning of winding, in which case only the essential parts of the device are shown. It goes without saying that all the elements shown are held in the machine frame, even if this is not shown. The core 4 is rotatably held in the fixed winding shaft 3. The core 4 is set in rotation in a direction of rotation 5 by means of a belt 6. The belt 6 is driven by a drive (not shown) in the running direction 7 and revolves around the deflecting roller 8, the opening roller 9, the ejector roller 12 and the tension roller 17. The band 6 forms a loop 11 between the deflection roller 8 and the opener roller 9, in which loop the winding shaft 3 and thus also the core 4 are arranged. The opener roller 9 is fastened to an opener arm 10, by means of which the opener arm 10 is pivotably mounted in the winding shaft 3 at its end opposite to the opener roller 9. The ejector roller 12 is rotatably held on an ejector arm 13, the ejector arm 13 being pivotally mounted at a pivot point 14 at its end opposite the ejector roller 12. The tensioning roller 17 is displaceably or pivotably held in a tensioning device 18. The tensioning device 18 is not shown in more detail. Linear or pivotable tensioning devices loaded by springs or drives are well known from the prior art. In order to support and guide the belt 6, a first guide roller 15 and a second guide roller 16 are arranged outside the belt 6. The second guide roller 16 is arranged relative to the tensioning roller 17 in such a way that the largest possible wrap of the belt 6 against the tensioning roller 17 is produced. The first guide roller 15 is used to guide the tape 6 when the ejector arm 13 is pivoted out together with the ejector roller 12 (see fig. 4) during roller replacement. The device is fed to the fleece 1 in the running direction 2. In this case, the web 1 passes between the belt 6 and the core 4 and is subsequently wound onto the core 4, resulting in the formation of a roll of cotton.

Fig. 2 is a schematic view of the device according to fig. 1 in the state at the end of winding, and fig. 3 is a schematic view of the device according to fig. 2 in direction X. At the end of the winding, a lap roller 19 having a lap roller diameter 20 is shown, in contrast to the start of winding. The lap roller 19 is held between a left-hand winding disc 27 and a right-hand winding disc 28 by the core 4 in the winding shaft 3, and in this case the winding discs 27 and 28 together with the lap roller 19 also rotate in the direction of rotation 5 of the core 4. A left-hand winding disc 27 is mounted in the left-hand side plate 25 and a right-hand winding disc 28 is mounted in the right-hand side plate 26 so as to be in each case rotatably and axially displaceable. The opener arm 10 is also pivotably held in the winding shaft and by means of an axial release movement 29 the winding discs 27 and 28 can be pushed apart in the winding shaft 3 and thus the core 4 together with the lap roller 19 can be released. Thus, during winding, the core 4 is held between the winding drums 27 and 28 in a rotationally fixed manner, so that the winding drums 27 and 28 are entrained by the belt 6 when the core 4 or the lap roller 19 is driven. Depending on the variation of the lap roller diameter 20 and the associated enlargement of the loop 11, the tensioning roller 17 is displaced relative to its position in fig. 1 by the tensioning device 18.

Fig. 4 is a schematic view of the device according to fig. 1 in a state in which the lap roller 19 is ejected. The opener roller 9 is moved around the opener roller 19 by an opening movement 21 (which corresponds to the pivoting movement of the opener arm 10 about the winding shaft 3) and thus the loop 11 of the belt 6 has been opened. Likewise, the tensioning roller 17 has been displaced by the tensioning device 18 by means of the tensioning movement 23 in order to maintain the tension of the belt 6 during the opening movement 21. Furthermore, the belt 6 has been tensioned between the deflection roller 8 and the opener roller 9 by means of an ejector movement 22 of the ejector roller 12, which corresponds to a pivoting movement of the ejector arm 13 about the pivot point 14. This causes the lap roller 19 to lift in the ejection direction 24.

Fig. 5 is a schematic diagram of a motion sequence in a graph. The sequence of each of the following is shown: the opening movement 21 of the opener roller 9, the ejecting movement 22 of the ejecting roller 12, the tensioning movement 23 of the tensioning roller 17 and the release movement 29 of the winding discs 28 and 29. Up to the beginning 30 of the change of the lap roller 19, the opener roller 19, the winding discs 28 and 29 and the ejector roller 12 are in the winding position. Only the tensioning movement 23 is performed due to the increase of the diameter 20 of the lap roller. From the beginning 30 of the replacement of the lap roller 19, a first phase 31 begins in which the opening movement 21 begins and the tensioning movement 23 is correspondingly carried out in order to maintain the tension in the belt 6. At the same time, the ejecting movement 22 of the ejecting roller 12 starts. This first stage 31 ends with reaching the end position of the tensioning roller 17. In a subsequent second phase 32, the opening movement 21 and the ejection movement 2 are completed and the release movement 29 is performed. The transition from the first stage 31 to the second stage 32 is determined by the tensioning roller 17 reaching the end position in its tensioning movement 23. In the second stage 32, the lap roller 19 is ejected by the ejecting movement 22. Then, the new core 4 is inserted and clamped between the winding discs 27 and 28 by reversing the release movement 29. As a result, the second phase 32 ends and the pop-up movement 22 and the opening movement 21 are reversed in the third phase 33, it being possible for the reversal of the pop-up movement 22 to have already been initiated in the second phase 32. The ejecting movement 22 may be reversed as soon as the ejecting roller 12 reaches its end position. After the reversal of the ejection movement 22 is completed, the tensioning movement 23 is activated and the belt 6 is tensioned around the newly inserted core 4. As soon as the opening movement 21 and the ejection movement 22 again reach their original positions, the end 34 of the change of the lap roller 19 is achieved and a new winding process can be started. The representation of these movements is schematic and the relation with respect to the speed of the different movements is not shown.

Fig. 6 is a schematic diagram of another embodiment of the present invention. In fig. 6, only the lower part of the device is shown, which comprises the ejector roller 12, the first and second guide rollers 15, 16, and the tensioning roller 17. The belt 6 runs around these rollers in the same way as in the previous figures. To perform the ejector movement 22, the ejector roller 12 is rotatably mounted at one end of the opening arm 13. The end of the opening arm 13 opposite the ejector roller 12 is pivotally fastened to the shaft of the first guide roller 15. The axis of the first guide roller 15 thus corresponds to the pivot point 14 of the opening arm 13. The tension roller 17 is rotatably mounted on the tension lever 35. The tension lever 35 is pivotally held at its end opposite the tension roller 17 at a pivot point 37 in the machine frame (not shown). A pneumatic cylinder 36 is fastened to the tensioning rod 35, by means of which the tensioning movement 23 is carried out. In the illustrated embodiment, the tensioning device 18 includes a tensioning lever 35 and a pneumatic cylinder 36.

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

List of reference numerals

1. Web of cotton rolls

2. Direction of web travel

3. Winding shaft

4. Core

5. Direction of rotation of the core

6. Belt with a belt body

7. Direction of belt travel

8. Deflection roller

9. Cotton opening roller

10. Cotton opening arm

11. Ring ring

12. Ejecting roller

13. Ejector arm

14. Pivot point of ejector arm

15. First guide roller

16. Second guide roller

17. Tensioning roller

18. Tensioning device

19. Cotton roll

20. Diameter of cotton roll

21. Opening movement

22. Pop-up motion

23. Tensioning movement

24. Ejection direction

25. Left-hand side plate

26. Right hand side plate

27. Left hand winding disc

28. Right hand winding disc

29. Releasing movement

30. Beginning of a roll change

31. First stage

32. Second stage

33. Third stage

34. End of the change of the lap roller

35. Tensioning rod

36. Pneumatic cylinder

37. The pivot point of the tension rod.

Claims

1. A method for replacing a lap roller (19) in an apparatus for producing a lap roller (19), said apparatus comprising: a core (4) which is held in the winding shaft (3) between two winding disks (27, 28) and comprises a lap roller (19) which is held on the core (4) and has a lap roller diameter (20); and an endless belt (6) which is wrapped at least partially around the lap roller (19) and the belt (6) is turned around a fixed deflection roller (8), a subsequent opening roller (9), an ejector roller (12) and a tensioning roller (17), and the opening roller (9) is rotatably mounted on a pivotable opening arm (10) held in the winding shaft and the ejector roller (12) is rotatably mounted on a pivotable ejector arm (13), and the tensioning roller (17) is rotatably mounted on a tensioning device (18), and the core (4) for receiving the lap roller (19) is wrapped by a loop (11) of the belt (6), which loop is formed between the deflection roller (8) and the opening roller (9) and becomes larger with an increase in lap roller diameter (20), characterized in that, when a specific lap roller diameter (20) is reached, the opening arm (21) is rotatably mounted on a pivotable ejector arm (13), the opening device (18) is reached and the movement of the tension device (18) is held by means of the loop (11) of the belt (19) while the opening arm (21) is held at the ejector position (18) is reached, -performing a release movement (29) of the winding disc (27, 28) and ejecting the cotton roll (19) via the opener roll (9).

2. Method according to claim 1, characterized in that when the deflection roller (8) is fixed, the lap roller (19) is lifted from the belt (6) by the displacement of the ejector roller (12) and the opener roller (9) and runs out of the winding shaft (3) due to gravity.

3. Method according to claim 1 or 2, characterized in that in the open state the belt (6) is guided via a fixed first guide roller (15) and a fixed second guide roller (16) between the ejector roller (12) and the tensioning roller (17), the first guide roller (15) and the second guide roller (16) being arranged outside the revolving belt (6).

4. A method according to claim 3, characterized in that the ejector arm (13) is moved around the axis of the first guide roller (15) by means of a pneumatic cylinder.

5. Method according to at least one of the preceding claims, characterized in that the tensioning roller (17) is moved by the tensioning device (18) such that the belt (6) is kept tensioned in the first phase of the opening movement (21).

6. Method according to at least one of the preceding claims, characterized in that the pop-up movement (22) starts in a first phase of the opening movement (21), which first phase of the opening movement (21) ends with the tensioning roller (17) reaching an end position in the tensioning device (18).

7. Method according to claim 6, characterized in that the release movement (29) of the winding disc (27, 28) is carried out in a second phase of the opening movement (21).

8. Method according to at least one of the preceding claims, characterized in that after the lap roller (19) has been ejected, a new core (4) is introduced into the winding shaft (3) and the opener arm (10) and the ejector arm (13) are returned to the winding position and at the same time the belt (6) is tensioned by the tensioning device (18).

9. Method according to at least one of the preceding claims, characterized in that the force acting on the belt (6) via the opening arm (10) is greater than the force acting via the tensioning device (18).

10. A device for replacing a lap roller (19), said device comprising: a core (4) which is held in the winding shaft (3) between two winding disks (27, 28) and comprises a lap roller (19) which is held on the core (4) and has a lap roller diameter (20); and an endless belt (6) wrapped at least partially around the lap roller (19), the belt (6) being tensioned around a fixed deflection roller (8), a subsequent opening roller (9), an ejector roller (12) and a tensioning roller (17), and the opening roller (9) being rotatably mounted on a pivotable opening arm (10) held in the winding shaft, and the ejector roller (12) being rotatably mounted on a pivotable ejector arm (13), and the tensioning roller (17) being rotatably mounted on a tensioning device (18), and the core (4) for receiving the lap roller (19) being wrapped by a loop (11) of the belt (6), the loop being formed between the deflection roller (8) and the opening roller (9) and becoming larger with an increase in lap roller diameter (20), characterized in that, when a specific lap roller diameter (20) is reached, there is provided: -opening the loop (11) of the band (6) by means of an opening movement (21) of the opener arm (10) and by means of a simultaneous ejection movement (22) of the ejector arm (13), while maintaining the tension on the band (6) by adjusting the tensioning device (18), providing the ejection of the lap roller (19) after a release movement (29) of the winding discs (27, 28).

11. Device according to claim 10, characterized in that a first guide roller (15) and a second guide roller (16) for guiding the belt (6) are arranged outside the belt (6) in the open state of the loop (11).

12. The device according to claim 10 or claim 11, wherein the tensioning means (18) comprises a tensioning lever (35) and a cylinder (36).