Search

CN-121992539-A - Synchronizing system for roving frame

CN121992539ACN 121992539 ACN121992539 ACN 121992539ACN-121992539-A

Abstract

The present invention relates to a synchronization system for a fiber drawing device of a roving frame, of the type having a drive section at only one end. The synchronization system is configured to be coupled to the non-driven portion of the at least one motorized drum to reduce and/or counteract a hysteresis or a lead torque generated by natural forces and friction of the long fiber drawing device during acceleration or deceleration, or due to a change in relative speed between the drums during normal operation.

Inventors

  • J. Roviratrias
  • A. Badageloseli

Assignees

  • 电子喷射有限公司

Dates

Publication Date
20260508
Application Date
20251031
Priority Date
20241105

Claims (16)

  1. 1. A synchronizing system for a stretching device of the type comprising at least two motorized drums arranged in parallel in a fixed position, wherein a driving portion for actuating the at least two motorized drums is arranged at only one of the two ends of the stretching device, wherein the system is configured to be coupled to the other non-motorized end of the stretching device, the system comprising: A shaft for each drum, the shaft being configured to be coupled to and integrally rotate with the non-motorized end of the drum, and wherein the shaft is configured with a pulley, and A belt configured to connect two pulleys corresponding to the two shafts to transfer traction between the corresponding rollers.
  2. 2. The system of claim 1, wherein the pulley and belt are configured with complementary coupling means, e.g. they are toothed, such that the teeth are connected in an interleaved manner.
  3. 3. The system of claim 2, wherein a first pulley is configured on a shaft coupled to a drum subject to less torsion, and wherein a second pulley is configured on a shaft coupled to a drum subject to greater torsion, wherein the first pulley is fixed and configured to rotate in the same direction with its corresponding shaft, and the second pulley is unidirectional and arranged to allow free rotation of the pulley in only one direction.
  4. 4. A system according to claim 3, Wherein, in the case that the first pulley is located upstream of the second pulley, the free rotation direction of the unidirectional second pulley is opposite to the driving direction of the first pulley, and Wherein, in the case that the first pulley is located downstream of the second pulley, the free rotation direction of the unidirectional second pulley is the same as the driving direction of the first pulley.
  5. 5. The system of claim 1, further comprising a third motorized drum disposed in a fixed position parallel on the other side of the second drum relative to the first drum, the system further comprising a third shaft configured to engage with and rotate integrally with a non-motorized end of the third drum, and wherein the third shaft is configured with a third pulley, wherein the second shaft further comprises a fourth pulley, and wherein the system further comprises a second drive belt configured to connect the third pulley and the fourth pulley corresponding to the third shaft and the second shaft, respectively, so as to transfer traction between the corresponding drums, wherein the third pulley is configured on a third shaft coupled to a drum subject to less torsion, and wherein the fourth pulley is configured on a second shaft coupled to a drum subject to greater torsion, wherein the third pulley is fixed and configured to rotate in the same direction with its corresponding shaft, and the fourth pulley is unidirectional and is configured to allow rotation of the pulley in only one direction, but not the opposite direction.
  6. 6. The system of claim 5, wherein the direction of free rotation of the fourth pulley is opposite to the direction of drive of the third pulley.
  7. 7. The system of claim 1, further comprising at least one tension module configured to adequately tension the belt based on a spacing between rollers, wherein the at least one tension module is configured to engage the first axis of the first roller and/or the third axis of the third roller.
  8. 8. The system according to claim 7, Wherein the at least one tension module comprises at least one vertical arm, wherein an upper portion of the vertical arm comprises a free-rotating roller arranged on the inside of the belt and against which the belt is pressed when rotating between the two pulleys, wherein the at least one tension module further comprises a spindle coupled to the spindle, the spindle being attached to the stretching device to allow the free-rotating roller to move transversely to the stretching device to allow the belt to be stretched appropriately according to the spacing between the rollers; or wherein said at least one tensioning module comprises two vertical arms, one corresponding to said first roller and the other corresponding to said third roller, allowing the two belts to be sufficiently tensioned according to the spacing between the rollers.
  9. 9. A synchronization method for a stretching device of the type comprising at least two motorized drums arranged in parallel in a fixed position, and wherein a driving portion for actuating the at least two motorized drums is arranged at only one of the two ends of the stretching device, wherein the system is configured to be coupled to the other non-motorized end of the stretching device, the method comprising: For each drum, coupling a shaft and a pulley rotating with the shaft to the non-motorized end of the drum, and Two pulleys corresponding to the two shafts are connected by a belt and traction is transmitted between the respective rollers.
  10. 10. The method of claim 9, wherein a first pulley is fixed and rotates in the same direction with its corresponding shaft, and a second pulley is unidirectional and rotates freely in only one direction, wherein the first pulley is configured on a shaft coupled to a drum subject to less torsion, and wherein the second pulley is configured on a shaft coupled to a drum subject to greater torsion.
  11. 11. The method of claim 10, wherein, In the case where the first pulley is located upstream of the second pulley, the unidirectional second pulley rotates freely in a direction opposite to the driving direction of the first pulley, and In the case where the first pulley is located downstream of the second pulley, the free rotation direction of the unidirectional second pulley is the same as the driving direction of the first pulley.
  12. 12. The method of claim 9, further comprising coupling a third motorized drum in parallel in a fixed position on the other side of a second drum relative to the first drum, further comprising coupling a third shaft and a pulley to a non-motorized end of the third drum that rotates integrally with the shaft, and wherein the third shaft is configured with a third pulley, wherein a second shaft further comprises a fourth pulley, and wherein the method further comprises connecting the third pulley and the fourth pulley, corresponding to the third shaft and the second shaft, respectively, by means of a second belt to transfer traction between the corresponding drums, including coupling the third pulley to the third shaft coupled to the drum subjected to less torsion and coupling the fourth pulley to the second shaft coupled to the drum subjected to greater torsion, wherein the third pulley is fixed and rotates in the same direction with its corresponding shaft, while the fourth pulley is unidirectional and rotates in only one direction, not rotating in the opposite direction.
  13. 13. The method of claim 12, wherein the fourth pulley rotates in a free-rotation direction opposite to the drive direction of the third pulley.
  14. 14. The method of claim 9, further comprising substantially tensioning the belt according to a spacing between rollers by at least one tension module coupled to the first shaft of the first roller and/or the third shaft of the third roller.
  15. 15. The method according to claim 14, Wherein the belt is supported between the two pulleys on a free-rotating roller, which is located inside the belt, and at least one vertical arm is supported on the free-rotating roller and moves the free-rotating roller transversely to the tensioning device, allowing the belt to be properly tensioned according to the spacing between the rollers; Or tensioning two belts according to the spacing between the rollers using two vertical arms of the at least one tensioning module, one vertical arm corresponding to the first roller and the other vertical arm corresponding to the third roller.
  16. 16. A fiber drawing apparatus, such as a roving frame, comprising at least one synchronizing system according to claim 1.

Description

Synchronizing system for roving frame Technical Field The present invention relates generally to the field of textile industry and more particularly to a synchronizing system for a fiber drawing device or system of a roving frame. Background Fig. 1 shows by way of example a fiber drawing device 100 (also called drafting system) for a roving frame, in this example the fiber drawing device 100 comprising three motorized (cylinderer) rollers arranged in parallel in a fixed position and covering virtually the whole length of the roving frame, and a plurality of press arms perpendicular to the motorized rollers, distributed along the roving frame and provided with freely rotating rollers arranged in parallel to said motorized rollers. The pressing arm has a first roller and a second free-rotating roller, which are arranged above the motorized drum in parallel thereto for pressing the fibers to be stretched. The pressure exerted on the fibers and driving them at an increased speed in the direction of travel (downstream, as indicated by the arrow) causes the fibers to stretch before being twisted and wound onto a spindle. The driving part 140 is located at the beginning of the roving frame (in this example, on the left side of the figure) and comprises at least one electronically controlled motor to vary the rotational speed of each drum. Due to the characteristics of such a drafting machine, such as different drum diameters, distances between drums, or desired degrees of stretching, the drums rotate at different speeds. In normal operation, the cylinders start simultaneously, i.e. synchronously, and then accelerate to their respective operating speeds, at which point they remain synchronized (although at different speeds). The drums are typically arranged to rotate at different speeds. In a typical configuration, the third roller 130, further upstream, rotates slower than the second roller 120, its function being to collect the fibers from the previous device and feed them into the drafting system. Accordingly, the third roller 130 is referred to herein as an input roller. Next, the second drum 120 in the middle rotates slower than the first drum 110. Accordingly, the first drum 110 rotates faster than the second drum 120 and the third drum 130. The second roller, due to its size and the size of its respective rollers, creates resistance to the movement of the fibers. Accordingly, the second roller 120 is referred to herein as a stretching roller. The first roller 110, further downstream, rotates fastest and together with the second roller, creates a stretch and drives the stretched fiber for collection on a spindle (not shown). Accordingly, the first drum 110 is referred to herein as an exit drum. The starting material for the overall process is a fiber made up of a plurality of coarse fiber segments, such as a blend of cotton and plastic, which when drawn together form finer yarns. However, during this stretching process, even if very light longitudinal forces are applied, the fiber may be susceptible to abrasion (or hairiness) because it is a very fragile material. To prevent fraying, the fibers are twisted on themselves, making them resistant to breakage along their main axis, forming a strong yarn. However, the more the fiber is twisted, the more resistant it is to breaking, but the more difficult it is to stretch and the more resistant it is. Thus, the yarn manufacturing process proceeds in stages. In the initial stage, the base material, i.e., undrawn fibers, is typically wider than the desired final yarn width, which is drawn to the desired degree. In a subsequent stage, the drawn yarn is twisted and other post-treatment steps are applied to complete the manufacture of the tough yarn. The degree of stretching depends on both the nature of the starting fiber and the function or application of the final yarn, as well as the post-treatment steps depending on the intended use. The speed and the rotational power of the motorized drum are carefully controlled, as otherwise excessive stretching or even breaking of the fibers may result. The finer the fiber, the more pronounced this adverse effect is, as the inherent strength of the fiber depends on its starting material. As such, the length of the stretching device is limited because it is difficult to precisely control the force applied between the press arm, rollers, intermediate fiber, motor and long drum of the drawing machine. However, in order to produce a more efficient, higher performance roving frame, it is desirable that the drawing device be as long as possible in order to provide the maximum number of drawing assemblies (press arms and rollers) to draw as many fibers as possible. Typically, existing long roving frames can be up to about 50 meters in length and contain rollers of similar length. In the future, it may be desirable to further increase this length. In order to rotate such long structures in a controlled manner, existing solutions employ