WO2010057320A1

WO2010057320A1 - Apparatus for producing a wound cotton wool ball

Info

Publication number: WO2010057320A1
Application number: PCT/CH2009/000334
Authority: WO
Inventors: Felix Keller; Willi Schlaepfer; Viktor Pietrini
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2008-11-20
Filing date: 2009-10-15
Publication date: 2010-05-27
Also published as: CN102216504A; EP2364383A1; EP2364383B1; CN102216504B; CH699951A2

Abstract

The invention relates to an apparatus for producing a wound cotton wool ball, comprising a revolving endless belt (R) which is tensioned by way of a tensioning apparatus (3) and is guided about a core (H) over several deflection rollers (R1 - R6) in order to form the wound cotton wool ball (WW) in a loop (S), wherein the core is held between two winding disks (W1, W2) protruding beyond the core in the radial direction and mounted in a machine frame (MS), and at least one of the deflection rollers (R2) is mounted movably transversely to the axis of rotation thereof by way of pivot means (8) so as to dispense the finished wound cotton wool ball. In order to prevent the belt edges (Rs) of the belt (R) from running onto the lateral winding disks (W1, W2) when starting a new winding process, it is proposed to provide additional means (15, 16; 18, 19; 21, 22; 31, 32; 38; 39; 44, 45; 51, 52), which hold the belt (R) in one position, viewed transversely to the longitudinal direction thereof, in the relaxed state thereof, or prior to renewed tensioning of the belt return it into a position which it had previously in the tensioned state during the winding process on the deflection rollers (R1 - R6).

Description

Device for producing a lap roll

The invention relates to an apparatus for producing a lap roll according to the preamble of the main claim.

Such a device, wherein the lap roll is formed using a circulating belt is z. For example, in EP-799337A1 already described.

In a further publication, EP-878 568 A2, the problems have already been pointed out and described, which can arise when the belt during the winding process drifts off to the side and across its direction of travel and comes into contact with its edges with the lateral winding disks. On the one hand, it may cause damage to the belt in its edge regions and on the other hand, edge fibers can be pulled out of the wound cotton web out, which in turn leads to a qualitatively unclean reel. Around

To solve problems and to guide the belt in a stable position to the winding disks, has been proposed here to provide the belt with a one-sided profiling, which cooperates with a profiled surface of the pulleys and forms a positive connection. Thus, although the belt could be performed laterally in an absolutely stable position, but this design is very complicated and expensive to manufacture, especially since the belt requires a special manufacturing. In addition, so that the problems of a possible lateral displacement of the belt are not solved when the belt in the relaxed state partially lifts off from the pulleys, whereby the positive connection between the profiling of the belt and the profile of the pulley is solved.

The belt, which is made as a flat belt with a corresponding structure, is subjected to a very high distortion and clamping force. It is therefore stable to form and therefore also has a corresponding rigidity. As a result, when unrestrained, it tends to shift laterally as it lifts off the pulleys. This happens when the finished cotton wrap is ejected. In this process, one of the pulleys is in a lower position pivoted to open the loop in which the winding was formed. At the same time the tension of the belt is released by the tensioning device, whereby the belt is loose after delivery of the roll over the pulleys and is held only between the side windows in a lateral position. However, it should be noted that the width of the belt is smaller than the clear distance between the side windows. That is, as can be seen from the cited EP-878 568 A2 that during the Wickefvorgang a small distance between the belt edge and the respective winding disk should be present to avoid the belt damage already described and the dissolution of edge fibers. When inserting a new sleeve for another

Winding process these side windows are shifted laterally by a certain amount, which also eliminates the lateral attitude of the position of the belt through the winding discs during this process. Only during the clamping operation of the new sleeve, with the winding disks moving again in the direction of the respective belt edge, the belt can be brought back into a specific position, which does not correspond to the actual working position described above during the winding process. When subsequent tensioning of the belt and the return of a pulley to form a new winding loop for the subsequent winding process, it may happen that the belt is laterally displaced on individual pulleys to the plant. Thus, at the start of the belt drive, the belt is fed eccentrically between the winding disks during its first travel, allowing the belt to bend and break in the edge region with which it impacts one of the winding disks. The belt can commute itself in its further movement in a central position between the winding disks or by corresponding devices, such as. As shown in WO 2005/038100, brought into a desired lateral position. However, this device is only effective during the winding process and can not eliminate the described problems in the starting process of the belt. It is therefore an object of the invention to eliminate the problems described and to ensure that the belt is already positioned at the start of the winding process after a successful roll change, that he centrally between the two winding discs is introduced. The term "centered" is to be understood that the belt when entering between the two winding rollers, as soon as it is set in motion, about the same distance from its edges to the respective winding disk has an upsetting and damaging the respective edge of the belt avoided when starting the belt.

This object is achieved by proposing that additional means be provided which hold the belt in its relaxed state, viewed transversely to its longitudinal direction, in one position or return it to a position before re-tensioning the belt, which it previously had stretched state during the winding process has taken on the pulleys. Assuming that the position of the belt on the pulleys in the tensioned state of the belt includes the central feed in the inside width between the two winding disks, so this is also carried out with the proposed attachment of the additional funds

Winding delivery guaranteed. In the described central feed is provided that between the belt edges and the respective winding disk, a distance is present. In order to avoid that the proposed guides in contact with the belt edges of the belt in the tensioned state, or during operation, it is further proposed that the means consist of guides in the relaxed state of the belt over a portion of the belt its side edges facing, wherein the guides are arranged outside the plane in which the belt moves when it is in the tensioned state. The term "plane" refers to a surface that extends laterally across the belt and in which the belt moves, thus ensuring that the guides are no longer in contact with the belt during operation, during which they have no function Have belt edges and thereby wear of the belt edge, for example by abrasion, is excluded. Furthermore, a solution is proposed, wherein at least a part of the guides are arranged to be movable and can be displaced in their position by adjusting means, wherein the adjusting means are coupled to the pivoting means of the deflection roller. With such a device, it is possible to shift guide elements into a region in which the belt is returned to a desired position (eg in the region of the deflection rollers) before the renewed tensioning operation, or is to be held in a defined lateral position. This is z. B. possible, after the belt has been brought by the guide elements in the desired position, to displace the guide element from the range of movement of the belt, as soon as it is tensioned and thus assumes a fixed position on the respective pulley. Even with this device it is avoided that the respective guide element comes into contact with the belt edge during operation. In addition, it is thereby made possible that the respective guide element can be brought as close as possible to the area of the circumference of the respective deflection roller. This ensures that the edge of the belt on the way between the

Guide element and the circumference of the respective guide roller can not shift laterally until the clamping operation and the fixed by the guide elements lateral positioning is maintained. The proposed coupling (mechanical or electrical) of the adjusting means with the pivot means of the deflection roller ensures the synchronization of both processes. Further details will be explained to the embodiments.

Advantageously, a device is further proposed, wherein at least one of the additional means is formed from a rotatably mounted pressure roller, which can be fed to form a nip with one of the deflection roller via adjusting means.

With this embodiment, it is possible for the belt, at least in the region of the respective deflection roller with the deliverable pressure roller to form a nip, before the belt tension is released. This ensures that the position of the belt - viewed transversely to its longitudinal direction - is maintained at least in the region of the deflecting roller provided with the clamping point. Following the carried out winding output and the re-tensioning of the belt, the Pressure roller are lifted again immediately before the belt is set in motion for a new winding process.

To synchronize the processes, the adjusting means for the pressure roller can be coupled to the pivot means of the deflection roller. Further advantages of the invention will be shown and described in more detail in subsequent embodiments. 1 shows a schematic side view of a winding device with guide means attached according to the invention, FIG. 1a shows a sectional illustration A-A according to FIG

2 shows a partial view according to Fig.1 with undeliverable pressure rollers

3 shows a partial view of Figure 1 with two embodiments of guide means

3a shows a partial side view of one of the embodiments of Figure 3

Fig. 1 shows a winding device 1, which has already been shown in the published EP-A 1-929 705 in a similar form and described in detail. Therefore, the operation of this winding device is described only superficially in the following description. In the winding device 1 shown, a lap roll WW is produced by means of a belt R. The belt R is guided over fixedly mounted or pivotally mounted rollers R1-R6, wherein it forms a loop S between the rollers R1 and R2 about a fixed axis of rotation AX. To produce a lap roll WW, a cotton wool W is fed into the loop S on the circumference of a sleeve H via the calender rolls K1 to K4 between the two rolls R1 and R2. The sleeve H is clamped between two winding disks W1, W2 shown in FIG. 1a during the winding process. In this case, a distance a (Fig. 3a) between the winding disks W1, W2 and the belt R is provided so that the belt edges Rs are not worn during the winding process. In order for the distance a shown schematically in FIG. 3a to the two winding disks W1, W2 to be maintained during the winding process, or for the course of the belt to be monitored, a monitoring or guiding device 10 is arranged in the region in front of the roller R1. Corresponding embodiments of such a monitoring device 10 are z. Example, from EP-1675976 or from EP-1837426 refer to. The signals emitted by the monitoring device are supplied via lines 23 to a control unit ST.

The control unit ST is connected via a path 24 with a valve 26, via which the connection is made by a pump 28 to a cylinder Z1, or interrupted. The cylinder Z1 engages an end of a not shown first bearing point of an axis 30, on which the roller R5 is mounted. On the opposite side of the first bearing parts, a second bearing, not shown, provided for the axis 30, which allows a pivoting movement of the axis 30 and thus the roller R5, which is generated by the displacement of the receptacle 31 via the cylinder Z1. A detailed representation and functional description of this device can, for. Example, be taken from the embodiments of EP-1675976.

Due to the inclination of the axis 30 from its original zero position (in a plane which extends approximately parallel to the plane of the belt inlet) also changes the position of the line of arrival of the belt R on the roller R5 with respect to the previous transport direction of the belt, which is also changed. As a result of this change, after a single revolution of the belt, there is also a transverse displacement of the belt R on the roller R5. With this device is to ensure that the belt R is held in a stable position during the winding process, so that in each case a distance a from its side edges Rs to the winding disks W1, W2 remains. With this device, it is possible to monitor the lateral position of the belt with respect to the winding disks, or to correct if necessary. This avoids that the belt R during the winding process with its side edges RS on the winding disks can dive.

As the roll WW increases, the loop S increases until the roll WW has reached a desired size. The reaching of the winding diameter is determined either directly by corresponding sensors on the circumference of the coil or indirectly by scanning the supplied cotton length. During the winding process, the belt displacement, or the control of the belt tension force is performed via a tensioning device 3, which a cylinder Z is controlled controlled. By the tensioning device 3, a tension roller R6 is pivoted about an axis 4. The roller R6 is rotatably mounted on a two-armed lever 5.

During the winding process, the lap roll WW rotates in the direction of rotation D. Shortly before the end of the winding process, the drive of the calender rolls K1-K4 is stopped, while the drive of the lap roll WW via the belt R is still in operation. As a result, the cotton wool in the region of the guide plate 6 is separated. Once the separation process is completed, the winding device 1 is stopped and the tension roller R6 pivoted about the cylinder Z in the position shown in phantom, whereby the belt tension is released. About the arm 8, which is pivotable about the axis AX, the roller R2 is pivoted via a device, not shown, down in the position shown by dashed lines R2 '. As a result, under the action of its own weight, the roller R3 is also pivoted downwardly into the position R3 'via the arm 9. Now, the two winding disks W1, W2 are moved axially outwards by a certain amount via a device, not shown, whereby the clear distance LA between the winding disks is increased and thereby the previously clamped in guides sleeve of the coil is released for the dispensing operation. Then, the belt R is again slightly tensioned via the tensioning device 3, whereby the belt (as shown in phantom) between the roller R1 and the roller R2 is stretched and thus triggers the ejection of the finished cotton roll WW on a recording, not shown. Subsequently, the belt is relaxed again, which he moves in the position shown in phantom in FIG. That is, especially in the areas between the rollers R2 and R3 and the rollers R6 and R1 takes the belt R due to its rigidity an arcuate shape and also partially lifts off from the rollers. In order to ensure that the belt in the tensioned state - seen transversely to its longitudinal direction - again comes to rest in a predetermined position on the rollers, in the described areas guides 15, 16; 18, 19; 21, 22 and 51, 52 respectively facing the belt edges Rs when the belt is in its untensioned position. In the embodiment of FIG. 1, fixed guides 15, which are aligned in pairs and in parallel, are fastened to the machine frame MS. 16; 18, 19; 21, 22 and 51, 52 are mounted, between which the belt is held in this position in a lateral position. The clear distance between the guide pairs is slightly larger than the width B of the belt R. As can be seen from the sectional view of Fig.1a, the guides 15, 16 (as well as the other guides 18, 19, 21, 22 and 51, 52 ) are provided with an angled portion 17, 20, which are attached at an angle c to the respective guides. The bends 17, 20 are aligned so that the clear width between the guides in the region of the bends, seen in the direction of the strained belt R, steadily increases. This ensures that the belt R on the way from its tensioned position in its relaxed position not on one of the end faces Fs of the respective guide 15, 16 is present and misunderstood. That is, the bends 17, 20 ensure that the belt passes exactly between the parallel aligned guides 15, 16 on the way in its relaxed position. The angled portions 17, 20 are short in their length, so that the belt when returning to its tensioned position can not escape laterally until it comes to rest on the respective roller. This ensures that during the subsequent clamping operation of the belt to prepare a further winding process already at the start of the belt this rests in the predetermined lateral position on the rollers. This avoids that the belt at startup, where the described balancing device in the role R5 still has no influence on the lateral position of the belt, with its edges on the winding disks W1, W2 and can be damaged. As can be seen from Fig. 1, the guides 21, 22 at a distance d to the belt R in the tensioned state. This avoids any contact between the guide and the belt when it is in the working position and driven. Thus, the risk of abrasion of the belt edge Rs is excluded by the guides 21, 22 during the winding process.

After the ejection process described above, a new sleeve H is displaced in the position of the axis AX via a device, not shown, whereby the

Belt R is moved between the rollers R1 and R2 'in the position shown in dashed lines and thus already slightly strained. Now the two winding disks W1, W2 again shifted axially against each other and the sleeve H clamped on not shown guides between the winding discs. Now the rollers R2, R3 are pivoted back to their upper position shown in FIG. Once the roller R2 is fixed in this upper position by corresponding means (not shown), the roller R6 is pivoted downwardly via the cylinder Z and the lever arm 5, whereby the belt is fully tensioned.

During the transfer of the belt from its relaxed position shown in phantom to the cocked position of the belt through the guides 15, 16; 18, 19, 21, 22 and 51, 52 guided laterally and held in a predetermined position.

Now a new winding process can be started. For this purpose, the calender rolls K1-K4 are set in motion again by a drive not shown in detail. Likewise, by the drive not shown one of the rollers R1-R6 of the belt R and thus the winding device is set in motion, whereby the readying end of the supplied cotton web W of the sleeve H is supplied for a new winding operation.

The embodiment of FIG. 2 (partial view of Figure 1) shows a further variant of additional means by which the belt R in the transition from its tensioned position to its relaxed position and a relaxed in the tensioned position in its lateral position to the Winding W1, W2 is held. In each case, a pressure roller 38, or 39 is used, the rotatably mounted axes 41, and 42 are mounted axially parallel to the respective roller R2, or R3. In the example shown, only two such rollers are shown, but it is also conceivable to assign the remaining rollers such a pressure roller. The pressure rollers 38, 39 are mounted in corresponding guides on not shown holders at the bearing points of the respective roller transversely to its axis of rotation. The shift is effected by a cylinder Z2 shown schematically, which is controlled by the control unit ST. As a rule, such a cylinder Z2 is attached to each end of the pressure roller. Before now the belt R, as in the previous example already has been described, is relaxed for the initiation of the winding output, the cylinder Z2 are acted upon by the action of the control unit ST with compressed air and thus move the pressure rollers 38, 39 in the direction of the circumference of the respective roller R2, R3. The respective pressure roller then comes to rest on the belt R and thus generates a clamping point KS between the belt R and the respective roller R2, R3. About this nip KS of the belt R is fixed laterally during the entire dispensing process of the finished roll WW and the supply of a new sleeve H on the respective role. Only after the belt is fully tensioned again before the start of a new winding process, the respective pressure roller 38, 39 is lifted off again via the cylinder Z2. This device also ensures that the belt is held or guided in a predetermined lateral position until the start of a new winding process.

Furthermore, in Figs. 3 (partial view of Figure 1) and Fig. 3a (partial side view of Figure 3) further embodiments of the invention are shown, wherein further means are provided, which the belt R before the re-tensioning in his Position or guide the lateral position.

In one of the means pivotally mounted guides 31, 32 are used about an axis 34, which are for the lateral positioning of the belt R in a region adjacent to the roller R2 'displaced, or pivotable. The pivoting movement is in each case carried out by a cylinder Z3, which is articulated on the machine frame on an axis 36 and is fixed to the axis 35 on the guides 31, 32. The cylinder Z3 is acted upon via the line 37 with compressed air, the supply of which is controlled by the control unit ST. Advantageously, it is possible in such a solution that the respective guide element 31, 32, after the belt is stretched again, is pivoted away from the possible collision area with the moving belt R during the winding process. It is possible, while performing the positioning or the guide work, to position these guide elements very close to the peripheral surface of the respective role. With the guide elements shown, it is possible to create a guide surface by swiveling in the guide elements right at the beginning of the relaxation of the belt, as has already been shown in the examples according to FIG. It is also possible with pivoting guide elements, at corresponding shaping of Führungsfiächen, this only shortly before re-tightening swing to move the belt in the predetermined lateral position, or to adjust.

With the attachment of laterally displaceable guide plates 44, 45 (FIG. 3 and FIG. 3a), a further embodiment results, wherein the belt R is positioned laterally only shortly before the renewed tensioning with respect to the winding disks W1, W2.

In this case, the guide plate 44 is connected to an axis 47 and the guide plate 45 with an axis 48, wherein the axes 47 and 48 are slidably mounted in bearings L. As shown schematically, the axes 47, 48 are each connected to a cylinder Z4, or Z5, which in turn are mounted on the machine frame via the axles 12, 13, respectively. The supply of compressed air to the cylinders Z4, Z5 or Z5 takes place synchronously according to the timing of the delivery process of the finished roll, or according to the start time for re-tensioning of the belt and is controlled by the control unit ST. To position the belt R prior to initiation of the tensioning operation, the two guide plates 44, 45 are slid over the shafts 47, 48 in the direction of the belt edges Rs until they reach a distance Fb. The distance Fb is slightly larger than the belt width B and slightly smaller than the clear distance LA between the winding disks W1, W2. This ensures that the belt is positioned before the clamping operation in a position in which a distance a to both winding disks is present. Thus, it is also excluded here during the starting process of the belt drive that one of the belt edges Rs of the belt R can accumulate on one of the winding disks. In the context of the invention, a variety of design variants are still possible. Also, the embodiments shown may be combined as desired and as required.

Claims

claims

1. Apparatus for producing a lap roll with a circumferential, by means of a tensioning device (3) tensioned, endless belt (R), for forming the lap roll (WW) in a loop (S) around a core (H) over several

Deflection rollers (R1 - R6) is guided, wherein the core between two, the core in the radial direction superior, in a machine frame (MS) mounted winding disks (W1, W2) is held and at least one of the deflection rollers for discharging the finished lap roll across pivot means across is mounted movably to its axis of rotation, characterized in that additional means (15,16;

18.19; 21, 22; 31, 32; 38; 39; 44.45; 51, 52) are provided, which hold the belt (R) in its relaxed state, seen transversely to its longitudinal direction, in a position or return before re-tensioning the belt in a position which he previously in a tensioned state during the winding process on the pulleys (R1 - R6) has taken.

2. Device according to claim 1, characterized in that the means consist of guides (15,16; 18,19; 21,22; 51,52) which, in the relaxed state of the belt (R) over a portion of the belt its side edges (Rs) facing, wherein the guides are arranged outside the plane in which the belt moves when it is in the tensioned state.

3. Apparatus according to claim 2, characterized in that the guides (15, 16) are arranged in pairs and have a clearance (Fb) to each other, which is greater than the width (B) of the belt (R) and the guides

(15,16) are each provided with an angled portion (17,20) which point in the direction of the belt in its cocked position, wherein the inside width of the opposite bends (17,20) of the paired guides - in the direction of the adjacent and strained belt seen - steadily increasing.

4. Apparatus according to claim 2, characterized in that at least a part of the guides (31, 32; 44, 45) are arranged movably and can be displaced in their position by means of adjusting means (Z3, Z4, Z5), wherein the adjusting means with the pivoting means ( 8) of the deflection roller (R2) are coupled.

5. Apparatus according to claim 1, characterized in that at least one of the additional means of a rotatably mounted pressure roller (38, 39) is formed, which for forming a clamping point (KS) with one of the deflection rollers (R2, R3) via adjusting means (Z2 ) are deliverable.

6. Apparatus according to claim 5, characterized in that the adjusting means (Z2) with the pivot means (8) of the deflection roller (R2) are coupled.