CH719799A1 - Procedure for changing a cotton swaddle. - Google Patents

Abstract

The invention relates to a device and a method for changing a cotton roll (19) in a device producing cotton rolls (19). The device has a core (4) held in a winding axis (3) between two winding disks with a cotton roll (19) held on the core (4) with a cotton roll diameter (20) and an endless belt (19) at least partially wrapping around the cotton roll (19). 6), the belt (6) rotating around a stationary deflection roller (8), a subsequent opening roller (9), an ejection roller (12) and a tension roller (17), and the opening roller (9) being attached to a pivotable in the Winding axis (3) held opener arm (10) and the ejection roller (12) on a pivotable ejection arm (13) and the tension roller (17) are rotatably mounted on a tensioning device (18). The core (4) for holding the cotton roll (19) is wrapped around by a loop (11) of the belt (6) formed between the deflection roller (8) and the opening roller (9) and which becomes larger as the cotton roll diameter (20) increases. When a certain cotton roll diameter (20) is reached, the loop (11) of the belt (6) is opened by an opening movement of the opener arm (10) and the cotton roll (19) is released by an ejection movement of the ejection arm (13) at the same time as a release movement of the winding disks the opening roller (9) is ejected, the belt (6) remaining tensioned by adjusting the tensioning device (18) while the loop (11) is being opened.

Description

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

[0002] A generic device is known, for example, from CH 695 692 A5. The device is used to roll up a fleece, a pile or cotton wool made of fiber material into a cotton roll before the fiber material is subjected to further treatment. For example, the device can be used in a combing plant to receive a fleece coming from a drafting unit outlet and fed via sweeping plates, calender rollers and/or the like, with the cotton roll produced then being presented to a combing machine. For the sake of simplicity, in the following, in connection with the supplied fiber material, we will only talk about a cotton sheet, which is not to be understood in a restrictive sense. A loop is formed by an endless belt between two pulleys. A core is inserted into this loop. A cotton sheet is guided to the core by guide elements and formed into a cotton wrap. The belt forming the loop is guided around the deflection rollers as well as a tension roller and another guide roller. When the cotton wrap is finished, the tension roller is loosened to relieve the load on the belt and thus also on the deflection rollers. After releasing a lock on the deflection roller, one of the deflection rollers is then guided around the roll so that it is free to be removed from the device. A disadvantage of the disclosed construction and the resulting method is that changing the cotton roll takes a lot of time and therefore productivity is low even at high winding speeds.

It is therefore the object of the invention to propose a method and an associated device which enables the cotton roll to be changed quickly.

To solve the problem, a method for changing a cotton roll in a device producing cotton rolls and the associated device are proposed. The device has a core held in a winding axis between two winding disks with a cotton roll held on the core with a cotton roll diameter and an endless belt that at least partially wraps around the cotton roll, the belt being around a stationary deflection roller, a subsequent opening roller, an ejection roller and a tension roller circulates. The opening roller is rotatably mounted on a pivoting opening arm held in the winding axis. The ejection roller is rotatably mounted on a pivotable ejection arm and the tension roller is rotatably mounted on a tensioning device. The core for receiving the cotton roll is wrapped by a loop of the belt formed between the deflection roller and the opening roller, which increases as the diameter of the cotton roll increases. When a certain cotton roll diameter is reached, the loop of the belt is opened by an opening movement of the opening arm and at the same time an ejection movement of the ejection arm takes place, the belt remaining tensioned by adjusting the tensioning device while the loop is being opened and then a release movement when the tensioning device reaches an end position Winding discs take place and the cotton roll is ejected via the opener roller. The loop of the belt opens the opening movement so far that the opening roller comes to lie below the winding axis and allows the cotton roll to be ejected over the opening roller. As a result, after the release movement of the winding disks, the cotton roll can be ejected without any additional aids by changing the belt tension through the ejection movement.

To drive the belt, one of the rollers, for example the deflection roller, is provided with an electric drive. Due to the maintenance of the tension of the belt while winding the cotton roll, the holding forces of the opener arm must be greater than the tension force introduced into the belt using the tensioning device. In return, this simultaneous movement of the opener arm, ejector arm and tensioning device enables the loop to be opened quickly, as there is no need to wait for the belt to relax before the opener movement occurs. In addition, the belt remains exactly in its axial position due to the prevailing tension. Likewise, when returning to the winding position, the belt is already tensioned before the opener arm is in an end position intended for winding.

As soon as the tension roller has reached its end position, the release movement of the winding disks begins. The ejection movement and the release movement of the winding disks do not wait for the end position of the opener arm to be reached, since continuing the opener movement after the tension roller has reached the end position leads to a relaxation of the belt and this relaxation can be used for the release movement of the winding disks. Once the ejection movement has been completed, the cotton wrap is ejected. Advantageously, the return of the ejection arm can begin while a new core is being inserted.

Preferably, the cotton roll is lifted by the belt by moving the ejection roller and the opening roller with the deflection roller stationary and runs out of the winding axis due to gravity. The ejection movement leads to a tightening of the belt between the deflection roller and the opening roller. Because the cotton roll with its core is no longer held in the winding axis after the winding disks have been opened, the cotton roll is lifted by the tightening of the belt.

Advantageously, in the open state, the belt is guided over a stationary first guide roller and a stationary second guide roller between the ejection roller and the tension roller, the first guide roller and the second guide roller being arranged outside the rotating belt. The second guide roller is used to ensure the largest possible wrap angle of the belt in order to maintain the tension roller in every operating case. This ensures that the belt is evenly tensioned. The first guide roller prevents the belt from sagging when the belt is relaxed and thereby prevents the belt from slipping in the direction of the winding axis. After the cotton wrap is ejected, the belt is briefly relaxed until a new core is inserted.

Alternatively, the ejection arm is moved by a pneumatic cylinder about an axis of the first guide roller. By moving a lever around the axis of the first guide roller, with a corresponding arrangement of the guide roller, a favorable ratio of lever length and angle of rotation can be achieved for the distance to be covered by the ejection roller, which results in a cheap and simple construction of the ejection arm.

Preferably, the movements necessary to change the cotton roll are carried out in three phases. A first phase begins with the opening movement and the ejecting movement with a simultaneous tensioning movement to maintain tension in the belt. The first phase ends with the tensioning roller reaching an end position which corresponds to the greatest possible deflection of the tensioning device. In a second phase that then begins, the ejection movement is completed by the ejection roller, during which the opener movement also ends and the cotton roll is ejected. In the first phase, which begins after the winding process has ended, the tensioning roller is moved by the tensioning device in such a way that the belt remains tensioned for as long as possible during the opener movement. As soon as the opener arm begins to open the loop, the tension roller is also moved accordingly. The opening movement means that a distance formed by the rollers and around which the belt runs is shortened. This circumstance is counteracted by the movement of the tension roller. As soon as the tension roller has reached its end position, the ejection roller takes over the function of belt tension. The ejection movement ensures that the belt is tensioned so that the cotton roll is lifted and ejected.

Preferably, the release movement of the winding disks is carried out in the second phase of the opener movement. An opening of the winding disks by the release movement, and thus an opening of a holder of the cotton roll, without waiting for the opening movement and the ejection movement to be completed, leads to a gain in time for the entire process of changing the cotton roll. Jamming of the core in its holders is also avoided, since the cotton roll is lifted after reaching the end position of the tension roller and the release movement.

After the cotton roll has been ejected, a new core is introduced into the winding axis and the winding discs are closed, which ends the second phase of changing the cotton roll. In the subsequent third phase, the opener arm and the ejector arm are returned to a winding position and at the same time the belt is tensioned by the tensioning device. As soon as the core is inserted and the release movement of the winding disks is reversed and the new core is clamped in the winding axis, the ejection movement, the opener movement and the movement of the tension roller can take place at the same time. The third phase of changing the cotton roll is completed by reaching the end positions of the opener arm and the ejector arm. The ejector roll and the opener roll are in their winding position and a new winding of a cotton roll can begin.

In a preferred embodiment of the cotton roll change, the reversal of the ejection movement begins in the second phase. As soon as the ejection arm has reached an end position and the cotton roll has been ejected, the return of the ejection arm can begin. Since the belt is still without tension, the insertion of a new core is not disturbed by the start of the return of the ejection arm.

Advantageously, a force acting on the belt through the opener arm is greater than a force acting through the tensioning device. For this purpose, the drives of the clamping device and the ejection arm must be designed accordingly. Preferably, a predetermined tension of the belt, which is introduced by the tensioning device, is reduced during the process of changing the cotton roll.

Advantageously, the clamping device comprises a clamping lever and a pneumatic cylinder. Compared to linear tensioning devices, the arrangement of a tensioning lever rotating around a pivot point has the advantage that the tensioning lever and the tensioning roller can be easily stored. In addition, due to the arrangement of the pneumatic cylinder, a high clamping force can be achieved via a lever effect with a small cylinder.

Further advantages of the invention are shown and described in more detail in the following exemplary embodiments. Figure 1 shows a schematic representation of a device for producing a cotton roll according to the invention in the state at the beginning of a winding; Figure 2 is a schematic representation of the device according to Figure 1 in the state at the end of a winding; Figure 3 is a schematic representation in direction X of the device according to Figure 2; Figure 4 is a schematic representation of the device according to Figure 1 in the state of ejection of the cotton roll; Figure 5 is a schematic representation of the movement sequences in a diagram and Figure 6 is a schematic representation of a further embodiment of the invention.

Figure 1 shows a schematic representation of a device for producing a cotton roll 18 according to the invention in the state at the beginning of a winding; only the essential components of the device are shown. It goes without saying that all elements shown are held in a machine frame, even if this is not shown. A core 4 is rotatably held in a stationary winding axis 3. The core 4 is set in rotation in a direction of rotation 5 by a belt 6. The belt 6 is driven by a drive (not shown) in a running direction 7 and rotates around a deflection roller 8, an opening roller 9, an ejection roller 12 and a tension roller 17. The belt 6 forms a loop 11 in between the deflection roller 8 and the opening roller 9 which the winding axis 3 and thus also the core 4 are arranged. The opening roller 9 is attached to an opening arm 10, the opening arm 10 being pivotally mounted in the winding axis 3 with its end opposite the opening roller 9. The ejection roller 12 is rotatably held on an ejection arm 13, the ejection arm 13 being pivotally mounted in a pivot point 14 at its end opposite the ejection roller 12. The tension roller 17 is held in a tensioning device 18 in a displaceable or pivotable manner. 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. 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 tension roller 17 in such a way that the belt 6 wraps around the tension roller 17 as much as possible. The first guide roller 15 serves to guide the belt 6 during a roll change when the ejection arm 13 with the ejection roller 12 is swung out (see Figure 4). A cotton web 1 is fed to the device in a running direction 2. The cotton web 1 passes between the belt 6 and the core 4 and is subsequently wound onto the core 4, which leads to the formation of a cotton roll.

[0018] Figure 2 shows a schematic representation of the device according to Figure 1 in the state at the end of a winding and Figure 3 shows a schematic representation in the direction 19 shown with a cotton roll diameter 20. The cotton roll 19 is held with the core 4 in the winding axis 3 between a left winding disk 27 and a right winding disk 28, the winding disks 27 and 28 rotate with the cotton roll 19 in the direction of rotation 5 of the core 4. The left winding disk 27 is rotatably and axially displaceably mounted in a left side plate 25 and the right winding disk 28 in a right side plate 26. The opening arm 10 is also pivotally held in the winding axis. By means of an axial release movement 29, the winding disks 27 and 28 can be pushed apart in the winding axis 3 and the core 4 with the cotton roll 19 can thus be released. Correspondingly, the core 4 is held in a rotationally fixed manner between the winding disks 27 and 28 during winding, so that when the core 4 or the cotton roll 19 is driven by the belt 6, the winding disks 27 and 28 are taken along. The tension roller 17 is displaced from its position in FIG. 1 by the tensioning device 18 in accordance with the change in the cotton roll diameter 20 and the associated enlargement of the loop 11.

4 shows a schematic representation of the device according to FIG so that the loop 11 of the belt 6 has been opened. Likewise, the tensioning roller 17 has been displaced by the tensioning device 18 with a tensioning movement 23 in order to maintain tension on the belt 6 during the opening movement 21. Furthermore, the belt 6 was tensioned between the deflection roller 8 and the opening roller 9 by an ejection movement 22 of the ejection roller 12, which corresponds to a pivoting movement of the ejection arm 13 about the pivot point 14. This subsequently leads to the cotton roll 19 being lifted in an ejection direction 24.

[0020] Figure 5 shows a schematic representation of the movement sequences in a diagram. Shown are the sequences of the opening movement 21 of the opening roller 9, the ejection movement 22 of the ejection roller 12, the tensioning movement 23 of the tensioning roller 17 and the release movement 29 of the winding disks 28 and 29. Until the start 30 of changing the cotton roll 19, the opening roller 19, the winding disks 28 and 29 as well as the ejection roller 12 in a winding position. A tensioning movement 23 only takes place due to the increase in the cotton roll diameter 20. From the start 30 of changing the cotton roll 19, a first phase 31 begins, in which the opening movement 21 begins and a tensioning movement 23 is carried out in order to maintain the tension in the belt 6. At the same time, the ejection movement 22 of the ejection roller 12 begins. This first phase 31 is completed by the tension roller 17 reaching an end position. In a subsequent second phase 32, the opening movement 21 and the ejection movement 2 are completed and the release movement 29 is carried out. The transition from the first phase 31 to the second phase 32 is determined by the reaching of an end position of the tension roller 17 in its tensioning movement 23. In the second phase 32, the cotton roll 19 is ejected by the ejection movement 22. A new core 4 is then inserted and clamped between the winding disks 27 and 28 by reversing the release movement 29. This ends the second phase 32 and the ejection movement 22 and the opener movement 21 are reversed in a third phase 33, whereby reversing the ejection movement 22 can already begin in the second phase 32. As soon as the ejection roller 12 has reached its end position, the ejection movement 22 can be reversed. After reversing the ejection movement 22, 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 have reached their original position again, the end 34 of changing the cotton roll 19 has been reached and a new winding process can be started. The representation of the movements is schematic and does not show any relationships to the speed of the various movements.

Figure 6 shows a schematic representation of a further embodiment of the invention. In Figure 6, only the lower part of the device is shown with the ejection roller 12, the first guide roller 15 and the second guide roller 16 as well as the tension roller 17. The belt 6 runs around the rollers in the same way as in the previous figures. The ejection roller 12 is rotatably mounted at one end of the opener arm 13 to carry out the ejection movement 22. An end of the opening arm 13 opposite the ejection roller 12 is pivotally attached to an axis 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 a tension lever 35. The tensioning lever 35 is held pivotably at its end opposite the tensioning roller 17 in a pivot point 37 in the machine frame (not shown). A pneumatic cylinder 36 is attached to the clamping lever 35, with the help of which the clamping movement 23 is carried out. In the embodiment shown, the clamping device 18 includes the clamping lever 35 and the pneumatic cylinder 36.

The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the patent claims are possible, as is a combination of the features, even if these are shown and described in different exemplary embodiments.

Reference symbol list

[0023] 1 cotton web 2 direction of travel of cotton web 3 winding axis 4 core 5 direction of rotation of core 6 belt 7 direction of travel of belt 8 deflection roller 9 opening roller 10 opening arm 11 loop 12 ejection roller 13 ejection arm 14 pivot point of ejection arm 15 first guide roller 16 second guide roller 17 tension roller 18 tensioning device 19 cotton roll 20 cotton roll diameter 21 Opening movement 22 Ejection movement 23 Clamping movement 24 Ejection direction 25 Left side plate 26 Right side plate 27 Left winding disc 28 Right winding disc 29 Release movement 30 Start changing cotton roll 31 First phase 32 Second phase 33 Third phase 34 End changing cotton roll 35 Clamping lever 36 Pneumatic cylinder 37 Pivot point clamping lever

Claims (12)

1. Method for changing a cotton roll (19) in a device producing cotton rolls (19), the device having a core (4) held in a winding axis (3) between two winding disks (27, 28) with a core (4) held cotton roll (19) with a cotton roll diameter (20) and an endless belt (6) which at least partially wraps around the cotton roll (19), and wherein the belt (6) is around a stationary deflection roller (8), a subsequent opening roller (9), an ejection roller (12) and a tensioning roller (17) rotate, and the opening roller (9) on a pivotable opening arm (10) held in the winding axis (3) and the ejection roller (12) on a pivoting ejection arm (13) and the tensioning roller (17) are rotatably mounted on a tensioning device (18), and the core (4) for receiving the cotton roll (19) is formed between the deflection roller (8) and the opening roller (9) and has an increasing cotton roll diameter (20). the loop (11) of the belt (6) becomes larger, characterized in that when a certain cotton roll diameter (20) is reached, the loop (11) of the belt (6) is opened by an opening movement (21) of the opening arm (10) and At the same time, an ejection movement (22) of the ejection arm (13) takes place, the belt (6) remaining tensioned by adjusting the tensioning device (18) while the loop (11) is being opened, and then a release movement when the tensioning device (18) reaches an end position (29) of the winding discs (27, 28) takes place and the cotton roll (19) is ejected via the opening roller (9). 2. The method according to claim 1, characterized in that the cotton roll (19) is lifted by the belt (6) by moving the ejection roller (12) and the opening roller (9) with the deflection roller (8) stationary and due to gravity from the winding axis (3) amounts to. 3. The method according to claim 1 or 2, characterized in that in the open state the belt (6) is guided over a stationary first guide roller (15) and a stationary second guide roller (16) between the ejection roller (12) and the tension roller (17). is, wherein the first guide roller (15) and the second guide roller (16) are arranged outside the rotating belt (6). 4. The method according to claim 3, characterized in that the ejection arm (13) is moved by a pneumatic cylinder about an axis of the first guide roller (15). 5. The method according to at least one of the preceding claims, characterized in that the tension roller (17) is moved by the tensioning device (18) in such a way that the belt (6) remains tensioned in a first phase of the opener movement (21). 6. The method according to at least one of the preceding claims, characterized in that the ejection movement (22) begins in a first phase of the opener movement (21), the first phase of the opener movement (21) ending with the tension roller (17) reaching an end position achieved in the clamping device (18). 7. The method according to claim 6, characterized in that the release movement (29) of the winding disks (27, 28) is carried out in the second phase of the opener movement (21). 8. The method according to at least one of the preceding claims, characterized in that after the cotton roll (19) has been ejected, a new core (4) is introduced into the winding axis (3) and the opening arm (10) and the ejection arm (13) into one The winding position can be returned and at the same time the belt (6) is tensioned by the tensioning device (18). 9. The method according to at least one of the preceding claims, characterized in that a force acting on the belt (6) through the opener arm (10) is greater than a force acting through the tensioning device (18). 10. Device for changing a cotton roll (19) with a core (4) held in a winding axis (3) between two winding disks (27, 28) and with a cotton roll (19) held on the core (4) with a cotton roll diameter (20 ) and an endless belt (6) which at least partially wraps around the cotton roll (19), the belt (6) being stretched around a stationary deflection roller (8), a subsequent opening roller (9), an ejection roller (12) and a tension roller (17). is, and wherein the opening roller (9) is rotatably mounted on a pivotable opening arm (10) held in the winding axis (3) and the ejection roller (12) on a pivoting ejection arm (13) and the tension roller (17) on a tensioning device (18). are, and wherein the core (4) for receiving the cotton roll (19) is formed by a loop (11) of the belt (6) which is formed between the deflection roller (8) and the opening roller (9) and becomes larger as the cotton roll diameter (20) increases. is wrapped, characterized in that when a certain cotton roll diameter (20) is reached, the loop (11) of the belt (6) is opened by an opening movement (21) of the opening arm (10) and by a simultaneous ejection movement (22) of the ejection arm (13 ) is provided while maintaining tension on the belt (6) by adjusting the tensioning device (18), with the cotton roll (19) being ejected after a release movement (29) of the winding disks (27, 28). 11. The device according to claim 10, characterized in that a first guide roller (15) and a second guide roller (16) for guiding the belt (6) in the open state of the loop (11) are arranged outside the belt (6). 12. Device according to claim 10 or 11, characterized in that the clamping device (18) comprises a clamping lever (35) and a pneumatic cylinder (36).