Device for producing a cotton wrap

Description

[0001] The invention relates to a device for producing a cotton roll from a cotton web.

[0002] Such a device, in which the lap is formed using a rotating belt, has already been described, for example, in CH 695 692 A5. The device is used to roll a nonwoven, a pile or batting made of fiber material into a lap before the fiber material is subjected to further treatment. For example, the device can be used in a combing plant to receive a nonwoven originating from a drafting system outlet and fed via sweeping plates, calender rollers and / or the like, with the produced lap being subsequently presented to a combing machine. For the sake of simplicity, the fed fiber material will be referred to below only as a lap web, which is not to be understood in a restrictive sense. A loop is formed by an endless belt between two deflection rollers. A core is inserted into this loop.The core is held in place on both sides by winding discs. A web of cotton is guided to the core by guide elements and formed into a cotton roll between the winding discs on the core. The belt forming the loop is guided around the deflection pulleys and a tension pulley. The web of cotton is pressed against the core by the rotating belt and wound onto it. Quality losses occur if the belt drifts sideways and perpendicular to its running direction during the winding process and its edges come into contact with the lateral winding discs. This can cause damage to the belt at its edges, and can also lead to edge fibers being pulled out of the web of cotton being wound up, which in turn leads to a poor quality roll.

[0003] To maintain the quality of the resulting cotton roll, the belt must be replaced after a certain period of use. If the belt becomes damaged, it will naturally need to be replaced before the end of this period. Since the belt is endless, the belt is removed by lifting it from the idler pulleys in a relaxed state, wrapping it around the outside of the idler pulleys and moving it inward into the winding area. The belt can then be removed perpendicular to the axes of the idler pulleys between two idler pulleys. The new belt is installed in the reverse order.

[0004] Due to the stiffness of the belt and the pressure required to form the lap between the belt and the core, or rather the lap forming on the core, the tensioning pulley introduces a tension of up to 20 kN / cm2 into the belt. The high tensile forces of the belt must be absorbed by the roller bearings. In addition, the inner rollers, which the belt rotates around, must be held in such a way that the belt can be easily replaced. For this purpose, rollers with cantilever bearings are known from the prior art. Because the rollers are supported on one side, a rotating belt can be pulled off the rollers in the direction opposite to the bearings after the tension has been released, and a new, endless belt can be pushed onto the roller bearings.

[0005] In order to absorb the high tension forces, CH 695 692 A5 proposed providing additional means in the machine frame in the area of ​​the working position of the rollers forming the loop, by means of which the bearing element of the roller is supported in one end area against the belt tension. These means were provided as pivoting pawls in order to maintain freedom of movement of the rollers when changing the lap roll after the pawls have been opened. In order to achieve easy replacement of the belt and still enable a high tension force in the belt, DE 10 2008 040 110 A1 proposed that, due to the load, the inner rollers be mounted on both sides, but that a device be provided which enables rapid disassembly of at least one bearing point of the rollers mounted on both sides. The disadvantage of this is the high outlay required for a belt change when the inner rollers are mounted on both sides.There are also disadvantages for the operation of the device when additional holding elements are added when the rollers are stored on one side.

[0006] It is therefore the object of the invention to propose a device which enables a simple replacement of the belt and ensures the high requirements for a parallel belt guide.

[0007] The problem is solved by a device having the features of the independent claim. A device for producing a lap from a lap web is proposed, comprising a machine frame and a revolving endless belt.

[0008] The device has a rotatably mounted deflection pulley with a deflection pulley axis, a rotatably mounted opening pulley with an opening pulley axis, a rotatably mounted ejection pulley with an ejection pulley axis, and a rotatably mounted tension pulley with a tension pulley axis, wherein the belt rotates around the tension pulley, the deflection pulley, the opening pulley, and the ejection pulley. The device further comprises a core which is fixedly arranged in a winding axis for receiving the lap roll in a loop of the belt formed between the deflection pulley and the opening pulley, which loop becomes larger with an increasing lap roll diameter. The opening pulley, the ejection pulley, and the tension pulley are each rotatably mounted on an axle stub which is fastened on one side and in a rotationally fixed manner in a pivotable element. The deflection pulley is rotatably mounted in the machine frame with a one-sided bearing.This allows for the inclination of the idler pulley axis or the opener pulley axis or the idler pulley axis and the opener pulley axis to be adjusted to the winding axis. Because the pulleys are mounted on one side, a bending force acts on the bearing when loaded by the tensioned belt. Since elements such as a shaft journal or a shaft are fundamentally elastic, the corresponding pulley axis is subjected to bending by the rotating belt. This circumstance, as well as any general deformation of the machine elements, is counteracted by adjusting the inclination of the pulley axes. When the belt is relaxed, the idler pulley axis and / or the opener pulley axis are not parallel to the winding axis, but inclined. The tension in the belt deforms the axes in such a way that they are aligned parallel to the winding axis during winding operation, resulting in symmetrical belt rotation.

[0009] Preferably, the deflection pulley axis is arranged at an inclination α of 0.05 to 0.3 degrees relative to the winding axis. The bearings of the deflection pulley are designed in such a way that an elastic deformation corresponding to the set inclination occurs. A design that would result in no elastic deformation or in elastic deformation over the entire length of the deflection pulley axis would be complex and practically only practical if the deflection pulley were supported on both sides. Ideally, the design of the deflection pulley and its bearings are designed for an inclination of 0.1 degrees.

[0010] The deflection roller is preferably designed as a drive roller with a drive roller axis and a drive. The drive roller is rotatably mounted in a bearing flange, wherein the drive roller axis is arranged at an inclination (α) of 0.05 to 0.3 degrees to the winding axis. This has the advantage that the inclination of the drive roller axis can be adjusted by inclining the fastening in the bearing flange, i.e. a specific inclination is given depending on the selection of the bearing flange. The bearing flange, in turn, is held in a rotationally fixed manner in the machine frame. An outer diameter of the bearing flange is parallel to the winding axis. An inner diameter of the bearing flange is designed with the corresponding inclination, wherein a bearing is provided between the inner diameter of the bearing flange and the drive roller, such that the drive roller is held in the bearing flange so that it can rotate about the inclined drive roller axis.

[0011] Advantageously, an adjustment of the inclination β of the opening roller axis to the winding axis is provided by rotating the axle stub in its holder in the machine frame between 0.1 and 0.8 degrees. This simple adjustment option is provided by the axle stub being held in a rotationally fixed manner in the opener arm with its end facing the opener arm parallel to the winding axis. The end of the axle stub facing away from the opener arm, on which the opening roller is rotatably mounted, is arranged at an inclination to the winding axis. When the axle stub is rotated in its attachment to the opener arm, the inclination of the opening roller axis changes relative to a circular sector corresponding to a surface of the opening roller that is touched by the rotating belt. This changes the inclination of the opening roller axis to the winding axis in a plane formed by the two axes.

[0012] It is advantageous to provide at least one guide roller on one outer side of the belt, with the guide roller being mounted stationary and rotatable on both sides of the machine frame. By arranging the guide roller in the area of ​​the tension pulley, it can be ensured that the belt wraps around at least half of the tension pulley's surface in every position. This ensures that the belt is evenly applied with tensioning force.

[0013] Preferably, the axle stub of the opening roller is mounted on an opening arm pivoted around the winding axis in the machine frame to open the loop during a winding change. This allows for a simpler design than a linear movement for ensuring an opening movement during a winding change. Furthermore, it is also advantageous for the design of the movement mechanism of the ejection roller if the ejection roller is mounted on an ejection arm pivoted in the machine frame. The opening arm and the ejection arm can be pivoted, for example, by pneumatic cylinders.

[0014] Preferably, the tension pulley is held in a tensioning arm, which is pivotally mounted in the machine frame and actuated by a pneumatic cylinder to tension the belt through a tensioning movement. By arranging the pneumatic cylinder on the tensioning arm, a high tensioning force can be applied to the belt using a lever effect. The tensioning force can be adjusted and constantly maintained using a simple electropneumatic control.

[0015] In contrast, mechanical tension, for example by a spring, has the disadvantage of a tension force that is not constant over the entire spring travel when the spring travel changes. Mechanical systems are also subject to aging and must be readjusted and adjusted from time to time.

[0016] Advantageously, the only thing required for belt replacement is to relieve the load on the belt. Additional use of the pivoting mounts of the various rollers, in addition to relieving the load on the tension pulley, is not necessary. Since the loop provides sufficient reserve for lifting the belt from the rollers in the event of a missing core, the belt can be easily removed via the rollers mounted on one side, and a replacement belt can be inserted. No disassembly or special control measures are required for the belt.

[0017] Further advantages of the invention are shown and described in more detail in the following exemplary embodiments. Figure 1 is a schematic representation of an embodiment of a device for producing a lap roll with a circulating belt; Figure 2 is a schematic representation of an embodiment of a bearing for the deflection roller in a cross section; Figure 3 is a schematic representation of an embodiment of a bearing for the opening roller in a cross section; Figure 4 is a schematic representation of an embodiment of a bearing for the ejection roller in a cross section; and Figure 5 is a schematic representation of an embodiment of a bearing for the tensioning roller in a cross section.

[0018] Figure 1shows a schematic representation of an embodiment of a device for producing a lap roll 6 with a rotating belt 9. A lap web 1 is fed to the device in a running direction 2. The lap web 1 passes between the belt 9 and a core 5 and is subsequently wound onto the core 5, resulting in the formation of the lap roll 6. The core 5 is rotatably mounted on a stationary winding axis 4. The lap roll 6, which has a lap roll diameter 8, is built onto the core 5. The core 5 or lap roll 6 is rotated by the belt 9 in a rotation direction 7. The belt 9 is driven by a drive (not shown) in a running direction 10 and rotates around a deflection roller 12 with a deflection roller axis 13, an opening roller 14, an ejection roller 17, and a tensioning roller 23.The belt 9 forms a loop 11 between the deflection roller 12 and the opening roller 14, in which the winding axis 3 and thus also the core 5 and the lap roll 6 are arranged. The opening roller 14 is fastened by its opening roller axis 15 to an opening arm 16, wherein the opening arm 16 is pivotally mounted in a machine frame 3 with its end opposite the opening roller 14 in the winding axis 3. The ejection roller 17 is rotatably held by its ejection roller axis 18 on an ejection arm 19, wherein the ejection arm 18 is pivotally mounted in the machine frame 3 at its end opposite the ejection roller 17 at a pivot point 20. The tensioning roller 23 is rotatably held with its tensioning roller axis 24 on a tensioning arm 25, wherein the tensioning arm 23 is pivotally mounted in the machine frame 3 with its end opposite the tensioning roller 23 at a pivot point 26.To support and guide the belt 9, a guide roller 21 with a guide roller axis 22 is arranged outside the belt 9. The guide roller 21 is arranged relative to the tension roller 23 in such a way that the belt 9 wraps around the tension roller 23 as much as possible. The guide roller 21 is also rotatably mounted in the machine frame 3.

[0019] Figure 2 shows a schematic representation of a design of a bearing of the deflection roller designed as a drive roller 28 in a cross-section. The belt 9 runs over the drive roller 28. The drive roller 28 is rotatably mounted in a bearing flange 30. The drive roller 28 is connected to a drive 27. The drive 27 serves to drive the circulating belt 9 in the running direction 10 (see Figure 1). A drive roller axis 29, and thus also the drive roller 28 and the drive 27, are arranged at an angle α with respect to a line 33 arranged parallel to the winding axis. The inclination α is predetermined in the bearing flange 30. The bearing flange 30, with an outer diameter arranged parallel to the winding axis (or to line 33), is held in a rotationally fixed manner in the machine frame 3 by fastenings 31. An inner diameter of the bearing flange 30, which serves to accommodate the bearings 32 of the drive roller 28, is correspondingly inclined with respect to the line 33. With a rigid design of a connection between the drive 27 and the drive roller 28, an axis of the drive 27 must also be correspondingly inclined. When using a suitable coupling between the drive 27 and the drive roller 28, the axis of the drive 27 can be parallel to the line 33.

[0020] Figure 3shows a schematic representation of a design of a bearing for the opening roller 14 in a cross-section. The opening roller 14 is rotatably mounted on an axle stub 33 in bearings 35. The belt 9 runs around the opening roller 14. An opening roller axis 15 corresponds to an axis of the axle stub in the area of ​​the bearings 36. The opening roller axis 15 is inclined by an angle β with respect to the winding axis 4. For better understanding, a line 33 parallel to the winding axis 4 is inserted at the level of the opening roller axis 15. The axle stub 34 is held in a rotationally fixed manner in an opener arm 16, with a region of the axle stub 34, which serves for fastening in the opener arm 16, being arranged parallel to the winding axis 4, or rather to the line 33. The axle stub 34 is held in a rotationally fixed manner in the opener arm 16 by fastenings 35. The fastening 35 is designed in such a way that it allows an adjustment 37 by rotating the axle stub 34.When the axle stub 34 is rotated (as shown with adjustment 37), the inclination of the opening roller axis 15 relative to line 33 changes, and thus the angle β shown in the cross-section shown changes. Since the belt 9 only partially revolves around the opening roller 14 (see . Figure 1 ), the adjustment 37 provides the possibility of setting an elastic compensation for the deflections of the axle stub 34 caused by the tensioning forces of the belt 9.

[0021] The opening arm 16 is mounted on a bearing pin 39 via bearings 38, allowing it to rotate or pivot about the winding axis 4, within the machine frame 3. The bearing pin 39 is held in a rotationally fixed manner to the machine frame 3 by means of fastenings 40. A pneumatic cylinder 41 is attached to the opening arm 16 via a pivot point 43. The pneumatic cylinder 41 is attached to the machine frame 3 by a bracket 42. The pneumatic cylinder 41 pivots the opening arm 16 about the winding axis 4 when a lap roll located in the device is to be ejected.

[0022] Figure 4shows a schematic representation of a design of a bearing for the ejection roller 17 in a cross-section. The ejection roller 17, which is also partially wrapped by the belt 9, is rotatably mounted on a stub axle 44 by bearings 46. The stub axle 44 is held in a rotationally fixed manner in the ejection roller axis 18 in the ejection arm 19 by fastenings 45. An inclination of the ejection roller axis 18 relative to the winding axis 4 is not provided, since the compensation by the deflection roller 12 (see Figure 2 ) and / or the opening roller 14 (see Figure 3 ) is sufficient to achieve a smooth, centric running of the belt 9. The same applies to the belts shown in a schematic diagram in Figure 5A cross-sectional view of a bearing arrangement for tension pulley 23. Tension pulley 23, which is also partially wrapped by belt 9, is rotatably mounted on a stub axle 47 by bearings 49. Stub axle 47 is non-rotatably held in tension pulley axle 24 in tension arm 25. In the illustrated embodiment, the stub axle 47 is secured in tension arm 25 by a threaded pin 48, which is screwed into an internal thread in tension arm 25. Threaded pin 48 is part of stub axle 47.

[0023] The present invention is not limited to the illustrated and described embodiments. Modifications within the scope of the claims are possible. List of reference symbols

[0024] 1Cotton web 2Way of travel of cotton web 3Machine frame 4Winding axis 5Core 6Cotton roll 7Way of rotation of cotton roll 8Cotton roll diameter 9Belt 10Way of travel of belt 11Loop 12Deflection pulley 13Deflection pulley axis 14Opener roller 15Opener roller axis 16Opener arm 17Ejection roller 18Ejection roller axis 19Ejection arm 20Ejection arm pivot point 21Guide roller 22Guide roller axis 23Tension pulley 24Tension pulley axis 25Tension arm 26Tension arm pivot point 27Drive 28Drive roller 29Drive roller axis 30Bearing flange 31Fastening bearing flange 32Bearing drive roller 33Parallel to winding axis 34Opener roller stub axle 35Opener roller stub axle fastening 36Opener roller bearing 37Inclination adjustment 38Opener arm bearing 39Opener arm bearing journal 40Opener arm bearing journal fastening 41Pneumatic cylinder 42Bracket 43Pivot point 44Ejector roller axle stub 45Fastener axle stub 46Ejector roller bearing 47Idler roller axle stub 48Threaded pin 49Idler roller bearing αIllusion pulley βIllusion pulley

Claims

1. Device for manufacturing a batting roll (6) from a batting web (1), comprising a machine frame (3); and comprising a circulating endless belt (9); and comprising a rotatably-borne deflection roller (12) having a deflection roller axis (13); and comprising a rotatably-borne opening roller (14) having an opening roller axis (15); and comprising a rotatably-borne ejection roller (17) having an ejection roller axis (18); and comprising a rotatably-borne tensioning roller (23) having a tensioning roller axis (24), wherein the belt (9) runs around the tensioning roller (23) and the deflection roller (12) and the opening roller (14) and the ejection roller (17); and comprising a core (5) that is arranged so as to be stationary in a roll axis (4) to receive the batting roll (6) in a loop (11) of the belt (9), which loop is formed between the deflection roller (12) and the opening roller (14) and becomes larger with an increasing batting roll diameter (7); wherein the opening roller (14) and the ejection roller (17) and the tensioning roller (23) are in each instance borne rotatably on a stump axle (34, 44, 47) attached on one side and in a rotationally-fixed manner in a pivotable element (16, 19, 25), and the deflection roller (12) is held rotatably in the machine frame (3) with a one-sided bearing; characterized in that an adjustment of the inclination of the deflection roller axis (13) or of the opening roller axis (15), or of the deflection roller axis (13) and the opening roller axis (15), relative to the roll axis (4) is provided.

2. Device according to claim 1, characterized in that the deflection roller axis (13) is arranged with an inclination (α) of 0.05 to 0.3 angular degrees relative to the roll axis (4).

3. Device according to claim 1 or 2, characterized in that the deflection roller (12) is designed as a drive roller (28) with a drive roller axis (29) and with a drive (27) and is rotatably fastened in a bearing flange (30), wherein the drive roller axis (29) is arranged with an inclination (α) of 0.05 to 0.3 angular degrees relative to the roll axis (4).

4. Device according to at least one of the preceding claims, characterized in that an adjustment of an inclination (β) of the opening roller axis (15) relative to the roll axis (4) is provided by rotating the axle stub (33) between 0.1 and 0.8 angular degrees in its mounting in the machine frame (3).

5. Device according to at least one of the preceding claims, characterized in that at least one guide roller (21) is provided on an outside of the belt (9), wherein the guide roller (21) is borne in a stationary and rotatable manner on both sides in the machine frame (3).

6. Device according to at least one of the preceding claims, characterized in that the stub roller (33) of the opening roller (14) is borne on an opening arm (16), which is held in the machine frame (3) in the roll axis (4) so as to be pivotable about the roll axis (4), for opening of the loop (11) during a roll change.

7. Device according to at least one of the preceding claims, characterized in that the ejection roller (17) is borne on an ejection arm (19) that is held pivotably in the machine frame (3) at a pivot point (20).

8. Device according to at least one of the preceding claims, characterized in that the tensioning roller (23) is held in a tensioning arm (25), wherein the tensioning arm (25) is pivotably borne at a pivot point (26) in the machine frame (3) and is acted upon by a pneumatic cylinder for tensioning of the belt (9) via a pivoting of the tensioning arm (25).

9. Device according to at least one of the preceding claims, characterized in that, for a belt replacement, only a relief of the belt (9) is provided.