Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H54/00—Winding, coiling, or depositing filamentary material
  • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
  • B65H54/28—Traversing devices; Package-shaping arrangements
  • B65H54/2827—Traversing devices with a pivotally mounted guide arm
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

• the present invention relates to a yarn laying device for a textile machine, in particular a spinning or winding machine, having a laying element which is designed to periodically move a yarn to be wound up over a bobbin, and a drive device for the laying element.
• the invention also relates to a textile machine, in particular a spinning or winding machine, having a yarn laying device which comprises a laying element and a drive device for the laying element, wherein the laying element is designed to periodically move a yarn to be wound up over a bobbin, as well as to a method for operating a textile machine, in particular a spinning or winding machine, wherein a yarn to be wound up is periodically moved over a bobbin by a laying element of a yarn laying device, wherein a periodic movement of the laying element has two reversal points at which the laying element reverses its direction of movement.
• Certain spinning machines such as rotor spinning machines, can be designed to wind the yarn spun from fibers directly into cross-wound bobbins.
• the produced yarn is first wound onto smaller spinning tubes and then rewound into cross-wound bobbins in winding machines.
• the yarn in cross-wound bobbins is crossed during winding, creating a stable yarn package that can be easily transported and further processed.
• a yarn transfer device which periodically moves the yarn to be wound over the bobbin.
• Common yarn transfer devices include, for example, a grooved roller or an idler yarn guide. In the latter yarn laying devices, a yarn guide is periodically moved back and forth in front of the bobbin, whereby the yarn guide must first be slowed down at the reversal points and then accelerated again.
• Such yarn laying devices are used, for example, in the DE 10 2013 016 644 A1 and the DE 10 2004 025 519 A1
• a disadvantage of these yarn-laying devices is that the deceleration and subsequent re-acceleration of the yarn guide at the reversal points is inefficient, as this consumes additional energy.
• the object of the present invention is therefore to propose a yarn laying device which overcomes the disadvantages of the known yarn laying devices and in particular has an increased energy efficiency.
• the object is achieved by a yarn laying device, a textile machine and a method for operating a textile machine having the features of the independent patent claims.
• a yarn laying device for a textile machine comprising a laying element configured to periodically move a yarn to be wound over a bobbin, and a drive device for the laying element.
• the yarn laying device is characterized in that the drive device comprises at least one first crank mechanism with a first crank.
• the first crank mechanism can convert the rotation of the first crank into a periodic movement of the laying element.
• the movement of the laying element can, for example, follow a straight or curved line.
• the major advantage over known yarn laying devices is that a reversal of the laying element at the desired reversal points results from the mechanism of the crank mechanism, so that the laying element does not have to be decelerated by a drive at the reversal points and then accelerated again.
• a drive of the first crank can, for example, continue to run at an essentially constant rotational speed.
• the first crank can, for example, be designed essentially as a circular disk, with a force transmission element arranged away from a rotational axis of the disk.
• the crank can also have a bulge on which the force transmission element is arranged.
• the force transmission element can, for example, transmit at least certain portions of the rotation of the crank to the laying element via a pivot joint and a lever.
• the entirety of the crank and lever is referred to herein as a crank drive.
• parts of the laying element can also serve as a lever, for example.
• the force transmission element can, for example, be designed as a pin arranged perpendicularly on a plane of the crank.
• the power transmission element of the crank can be connected directly to the laying element via a guide rail, for example.
• the laying element is mounted, for example, in a pivot bearing that defines a rotation axis for a periodic movement along a circular segment. To achieve sufficient deflection between the reversal points of the movement, the laying element must be comparatively long.
• the first crank mechanism comprises a first connecting rod, which establishes a connection between the first crank and the laying element.
• a connecting rod is understood to be a rod, at the respective ends of which pivot bearings, or at least recesses for receiving pivot bearings, are arranged.
• a first end of the connecting rod can be connected to the power transmission element of the first crank via a first pivot bearing.
• a second pivot bearing can be connected to a second The connecting rod must be connected to the laying element at the end of the connecting rod.
• the first crank can be arranged away from the laying element, particularly to save space.
• crank's rotational movement Since in this arrangement only a portion of the crank's rotational movement is converted into the periodic movement of the laying element, the movement of the laying element is slowed down in the area of the reversal points. In this area, the crank's power transmission element moves essentially perpendicular to the direction of movement of the laying element.
• the drive device has a second crank mechanism with a second crank.
• the second crank mechanism with the second crank can, in particular, be arranged such that the deceleration of the traversing element in the region of the reversal points is reduced or compensated.
• the interaction of the first crank mechanism and the second crank mechanism allows a high traversing speed of the yarn traversing device and thus a high winding speed of the yarn to be spooled up to be achieved.
• the length of the periodic movement between the reversal points can also be increased by the second crank mechanism.
• the second crank can, for example, be designed identically to the first crank. When the yarn traversing devices are used as intended, the first crank and the second crank are operated offset by 180°, in particular. This means, for example, that the power transmission elements of the first crank and the second crank are always arranged exactly opposite one another with respect to their respective axes of rotation.
• the second crank mechanism comprises a second connecting rod that establishes a connection between the second crank and the laying element.
• the second connecting rod can be designed similarly or identically to the first connecting rod.
• two pivot bearings at the respective ends of the second connecting rod can again transmit only a specific portion of the rotational movement of the second crank to the laying element.
• a pivot bearing of the second connecting rod can, for example, form the rotational axis for the movement along the circular segment caused by the first crank mechanism.
• the laying element has a first end with a yarn guide and a second end opposite the first end, wherein the first connecting rod is connected to the second end and wherein the second connecting rod is connected to an area between the first end and the second end, in particular to a rotation axis of the laying element.
• This arrangement makes it possible to particularly prevent a slowing down of the movement of the laying element at the reversal points.
• the shape of the movement and the length of the deflection between the reversal points can also be adjusted very flexibly, especially through the shape of a guide of the laying element.
• the width of the laying element can, for example, be greater in the area of the connection to the second connecting rod than at the second end. This increases the stability of the laying element.
• a distance between the second end of the laying element and the connection of the second connecting rod with the laying element depends on how long the periodic movement between the reversal points should be and what shape the movement of the yarn guide should have.
• the yarn laying device comprises a guide for the laying element.
• the guide allows the shape of the Movement of the laying element must be defined.
• the guide can be designed as a simple swivel joint.
• the guide of the laying element must additionally allow at least one thrust movement, especially a translational movement, of the laying element.
• the guide is designed as a linear guide, slotted guide, roller guide, and/or pendulum support. These guides allow the movement of the laying element to be adjusted precisely and stably.
• a linear guide refers to a guide that limits possible movement to a movement along a straight line.
• the slotted guide and the roller guide can, of course, be linear guides if this condition is met.
• the slotted guide and the roller guide can also provide guidance along a curved line.
• a slotted guide usually comprises a recess in a guide element into which a guide pin engages, for example. The shape of any possible movement is thus limited to the shape of the recess.
• a certain resistance is created by the guide.
• at least two rollers usually engage a guide element.
• the shape of the guide element limits the shape of the possible movement.
• the rolling action may result in less resistance than with the guide rail.
• the guide in the form of a pendulum support is designed similarly to the connecting rods described above.
• a pivot bearing of the pendulum support is connected to the laying element, for example, while another pivot bearing of the pendulum support is fixed.
• the guide in the form of a pendulum support can only provide a radial curved guide and therefore, unlike the other guides described, cannot form a linear guide.
• the guide can also be designed as a leaf spring, especially without bearings.
• the leaf spring supports the acceleration and deceleration of the installation element and increases the smoothness of the system.
• the drive device comprises a first drive or the first drive and a second drive. If the yarn laying device only comprises the first crank drive with the first crank, the first drive is sufficient to drive the first crank to the desired rotational movement. If the yarn laying device comprises the first crank drive with the first crank and the second crank drive with the second crank, the first drive can, for example, drive the first crank and the second crank together. Without an additional gear, the first crank and the second crank would rotate at the same speed. Alternatively, it is also conceivable for the first crank and the second crank each to have their own drive. In this case, the first drive drives the first crank and the second drive drives the second crank. This may make it possible to realize special movement patterns of the laying element that would not be possible with a common drive. In particular, the rotational speed of the individual cranks can be individually varied depending on the position of the laying element.
• the pendulum support described above can be equipped with a drive and possibly a crank, with the drive of the pendulum support preferably operating in an idle motion.
• the textile machine according to the invention which is designed in particular as a spinning or winding machine, comprises a yarn traversing device comprising a traversing element and a drive device for the traversing element.
• the traversing element is designed to periodically move a yarn to be wound up over a bobbin.
• the textile machine is characterized in that the drive device has at least one first crank drive with a first crank.
• the yarn traversing device with the first crank drive means an efficiency gain for the textile machine since, in comparison to known yarn traversing devices, the traversing element does not have to be braked and then accelerated again by the drive at the reversal points of the periodic movement.
• the yarn laying device of the textile machine can in particular be designed as described above, wherein the described features can be implemented individually or in any combination.
• the drive mechanism of the yarn traversing device has a second crank mechanism with a second crank.
• the interaction of the first crank mechanism and the second crank mechanism allows for a particularly high traversing speed of the yarn traversing device and thus a high winding speed on the textile machine.
• the increased efficiency of the yarn traversing devices according to the invention thus directly results in an increased efficiency of the textile machine according to the invention.
• the drive device comprises a first drive or the first drive and a second drive.
• the first drive can drive the first crank.
• the first drive can also drive the first crank and the second group together.
• the first drive drives the first crank and the second drive drives the second crank.
• the second drive causes This increases the cost of manufacturing the textile machine, but allows for finer adjustment of the movement patterns of the yarn traversing elements, which may have a beneficial effect on the structure of the resulting cross-wound bobbins.
• Path control or path regulation of the drives enables specific yarn traversing patterns on the bobbin.
• first drive and/or the second drive are independent of a bobbin drive.
• the bobbin and the yarn traversing devices sometimes share a common drive, which can reduce the manufacturing costs of the textile machines.
• these drives are independent of each other, i.e., the bobbin and the yarn traversing devices each have their own drives. This makes it much easier to adjust the movement of the traversing element of the yarn traversing devices and adapt it to the desired properties of the package.
• the method according to the invention for operating a textile machine, in particular a spinning or winding machine, wherein a yarn to be wound up is periodically moved over a bobbin by a laying element of a yarn laying device, wherein a periodic movement of the laying element has two reversal points at which the laying element reverses its direction of movement, is characterized in that the movement of the laying element, in particular the reversal of the direction of movement of the laying element at the reversal points, is brought about by an interaction of at least a first crank with the laying element.
• the reversal of the direction of movement of the laying element occurs purely mechanically.
• the laying element does not have to be braked by a drive and then accelerated again in the opposite direction.
• the movement of the traversing element in particular the reversal of the direction of movement of the traversing element at the reversal points, is brought about by the interaction of the first crank and a second crank with the traversing element.
• the second crank can, for example, accelerate the movement of the traversing element in the region of the reversal points in such a way that high traversing speeds and thus high winding speeds of the yarn to be wound into a cross-wound bobbin are possible.
• the short turning points in the yarn traversing thus created reduce the yarn density at the bobbin edges, which leads to a favorable density distribution of the bobbins.
• the reversal speed can be increased by increasing the crank speed at the reversal points.
• the offset between the first crank and the second crank influences the traversing width of the traversing element.
• No offset between the cranks i.e. an offset of 0°, results in the smallest traversing width.
• the power transmission elements of the cranks are in the same position with reference to the respective rotational axis.
• An offset of 180° between the cranks results in the largest traversing width.
• With an offset of 180° the power transmission elements of the cranks are in exactly opposite positions with reference to the respective rotational axis of the cranks.
• the traversing width is preferably varied during package build-up in order to distribute the yarn, for example, along the package edges and reduce the yarn density there. This can be achieved, for example, by changing the offset between the cranks during the winding process.
• the change in the traversing width over time is also referred to as stroke breathing.
• the rotational speed of the first crank and/or the second crank is varied, in particular increased, when the laying element is located in the area of one of the reversal points. This allows a slowing down of the movement of the laying element in the The reversal points resulting from the mechanical interaction between the first crank and/or the second crank and the laying element are completely compensated for. Even if the rotational speed of the first crank and/or the second crank is increased in certain positions of the laying element, the method according to the invention still results in increased efficiency, since the laying element does not have to be braked and the direction of movement does not have to be reversed by the drive.
• special, particularly asymmetrical laying patterns can also be created on the spool, which could not previously be easily created using known methods.
• the movement of the traversing element is referred to as periodic in the description of the present invention. However, this does not preclude the possibility of changing the frequency of the movement and/or the traversing width of the traversing element during the winding of a bobbin. This is even necessary to influence the yarn density on a bobbin, as already described.
• the present invention primarily serves to move a yarn to be wound over a bobbin in a variable path with a fundamentally recurring movement.
• Figure 1 shows a side view of a workstation 1 of a textile machine 2 according to the invention designed as a winding machine.
• a yarn 3 is rewound from a spinning tube 4, which was produced, for example, by a ring spinning machine, onto a bobbin 5, in particular a cheese.
• the yarn 3 must be periodically guided over the bobbin 5 during winding.
• a yarn laying device 6 according to the invention is used for this purpose.
• the exact structure of the yarn laying device 6 is shown in the following figures.
• the structure of the yarn laying device 6 in Figure 1 For example, corresponds to one of the embodiments from the Figures 3 to 6 .
• the laying element 18 is restricted to exactly one degree of rotational freedom by a pivot bearing 23.
• the first crank mechanism 7 enables a mechanical conversion of the circular movement of the first crank 20 into a periodic movement of the laying element 18. Braking and re-acceleration of the laying element 18 at the reversal points 24 (see Figure 6 ) of the periodic movement, especially by a drive, is therefore no longer necessary. This results in increased energy efficiency of the yarn laying device 6.
• the first crank mechanism 7 comprises a first connecting rod 25, which establishes a connection between the first crank 20 and the laying element 18.
• the first connecting rod 25 comprises two pivot bearings 23, one of the pivot bearings 23 being connected to the power transmission element 21 of the first crank 20 and another pivot bearing 23 being connected to the laying element 18.
• the first connecting rod 25 allows the structure of the yarn laying device 6 to be made more flexible.
• the friction of the drive device 19 can be reduced by a corresponding design of the pivot bearings 23.
• the first drive 9 of the drive device 19 which drives the first crank 20 to a rotary movement.
• the slowing down of the movement of the laying element 18 in the region of the reversal points 24 is at least partially compensated for by the use of the second crank drive 8 with a second crank 30.
• the second crank drive 8 comprises a second connecting rod 31, which establishes a connection between the second crank 30 and the laying element 18.
• the first connecting rod 25 is connected to the second end 28 of the laying element 18.
• the second connecting rod is connected to an area 32 of the laying element 18 between the first end 26 and the second end 28.
• the connection of the second connecting rod 31 to the laying element 18 simultaneously forms an axis of rotation for the periodic movement of the laying element 18. In the area 32 of the connection of the second connecting rod 31, the laying element 18 is wider in order to increase the stability of the laying element 18.
• the second connecting rod 31 also comprises two pivot bearings 23, one of which is connected to a power transmission element 21 of the second crank 30, and the second pivot bearing 23 is connected to the laying element 18.
• the first connecting rod 25 and the second connecting rod 31 engage the laying element 18 on different sides of the image plane. This prevents one-sided loading of the laying element 18, but can potentially lead to unwanted vibrations.
• the first connecting rod 25 and the second connecting rod 31 can also engage the laying element 18 on the same side.
• first crank 20 and the second crank 30 are driven jointly by the first drive 9.
• the first crank 20 and the second crank 30 are preferably offset by 180° to each other. operated, whereby the maximum deflection of the laying element 18 occurs between the reversal points 24 of the periodic movement.
• the offset of 180° means, in particular, that the force transmission elements 21 of the first crank 20 and the second crank 30 are positioned exactly opposite the respective axes of rotation.
• the yarn laying device 6 is designed similarly to the embodiment of the Figure 3
• the yarn laying device 6 additionally comprises a guide 33 for the laying element 18.
• the guide 33 is designed as a linear guide and, in particular, as a slotted guide.
• linear guide means that translation of the laying element 18 is limited to a movement along a straight line.
• the guide 33 is designed as a linear guide.
• the linear guide is designed as a roller guide.
• the roller guide comprises two rollers 34, which are indicated in the figure by dashed lines.
• the rollers 34 enclose a guide element 35, which is straight and thus limits the translational movement of the laying element 18 to a straight line.
• the guide 33 can also be curved. This allows adjustments of the yarn transfer device 6 to the desired properties of the package to be produced.
• the guide 33 of the yarn laying device 6 is designed as a pendulum support.
• the guide 33 comprises a third connecting rod 36, wherein a pivot bearing 23 of the third connecting rod 36 is arranged in a fixed position.
• Another pivot bearing 23 of the third connecting rod 36 engages at the same point of the laying element 18 as the second connecting rod 31 of the second crank drive 8.
• the first crank 20 is driven by the first drive 9, and the second crank 30 is driven by the second drive 10.
• This figure shows the reversal points 24 for the periodic movement of the traversing element 18.
• the traversing element 18, or more precisely the first end 26 of the traversing element 18 with the yarn guide 27, is located at one of the reversal points 24.

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Citations (6)

• 2024
  • 2024-03-08 EP EP24162454.3A patent/EP4613687A1/fr active Pending
• 2025
  • 2025-03-07 CN CN202510267839.XA patent/CN120607156A/zh active Pending

Patent Citations (6)

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