Winding tension control device

Abstract

To provide a tension controller for a winding, capable of suppressing an excessive fluctuation of a tension generated in a wire wound to a spool.SOLUTION: A wiring material 3 supplied from a bobbin is wound to a spool 8 that is rotated and driven. In a path of the wiring material 3 supplied to the spool, a detour path 15 is formed by moving the wiring material in a loop like. The detour path 15 comprises a plurality of guide parts 30 that provides a plurality of plate springs 20 that is extended to a radial shape from a boss part 18 supported to a base board 10 via a bearing 17 so as to be freely rotatable, and is periphery arranged onto each tip end of the plurality of plate springs 20. The wiring material is guided and wounded to the plurality of guide parts 30. The plurality of guide parts 30 is rotated around the bearing 17 by a friction force acted when it is contacted to the wiring material 3, and suppresses a tension fluctuation of the wiring material by deflection of the plate springs 20. Thus, since the tension fluctuation of the wiring material 3 supplied from a nozzle is suppressed, an arrangement winding of the spool can be appropriately realized.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a winding tension control device and a winding tension control method. [Background technology]

[0002] In the winding method of winding a wire around a winding object, it is necessary to keep tension fluctuations within a specified range in order to align and wind the wire (copper wire) around a reel. However, if the shape of the reel on which the wire is wound or the winding speed fluctuates, the tension will also fluctuate. In conventional technology, a spring or other device is used to apply a constant load to the wire to control the tension, but this cannot keep up with fluctuations in tension at high speeds. When the tension decreases, slack occurs in the wire, making it difficult to wind it evenly around the reel.

[0003] As another prior art, the winding device disclosed in Patent Document 1 is a winding device that forms a coil by winding multiple conductor wires around a reel, and attempts to apply equal tension to each conductor wire when winding the multiple conductor wires in an aligned state.

[0004] According to the disclosure of Document 1, a plurality of conductor wires are supplied from a reel, on which the conductor wires have been wound in advance, to a spool via a tension generating mechanism, and a coil is formed on the spool. Specifically, the reel is rotated and revolved around the spool, and the plurality of conductor wires supplied from the reel are wound onto the spool. The plurality of conductor wires supplied to the spool pass through a tension generating mechanism, where they are made to meander in an aligned state, thereby applying equal tension to each conductor wire by the elastic force of each conductor wire itself. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5130098 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the winding device of Patent Document 1, the conductor wire supplied to the reel is a wire work in which multiple conductor wires are arranged in parallel in a strip shape, and the device is equipped with a tension generating mechanism that applies uniform tension to each conductor wire that makes up this work. In contrast, the present invention is not configured to apply uniform tension to a plurality of conductors arranged in parallel, and the number of conductors is not important, nor is it configured to meander a plurality of conductors.

[0007] In comparison with Patent Document 1, the present invention differs from Patent Document 1 in that the problem of the present invention is to suppress fluctuations in tension acting on the path of the wire being supplied to the reel, and the means (configuration) for solving the problem is different from the configuration of Patent Document 1 as described above. An object of the present invention is to provide a winding tension control device and a winding tension control method that suppress excessive fluctuations in tension occurring in a wire wound around a bobbin. [Means for solving the problem]

[0008] The winding tension control device of the present invention is a winding tension control device (1) provided in a path for supplying a wire to a winding frame (8), A base (10), a boss portion (18) supported on the base so as to be freely rotatable about a central axis (9); A plurality of radially extending portions are provided from the boss portion. board Ba hey( 20) and The plurality of board Ba Neno a plurality of guide portions (30) fixed to the tip and arranged around the circumference; One end (201) of the leaf spring is fixed to the boss portion, and the other end (202) is fixed to the guide portion. the leaf spring extends obliquely in an eccentric direction deviating radially outward from a position eccentric to the center position of the boss portion, The plurality of guide portions rotate around the central axis due to an external force acting when the guide portions come into contact with the wire wound around the guide portions, board Ba NenoSuppresses tension fluctuations in wire rods due to deflection death, By increasing or decreasing the amount of deflection of the leaf spring, the effective radius, which is the distance between the position of the central axis of the boss portion and the position of the guide portion, is made variable, thereby adjusting the tension of the wire material supplied to the reel. Adopt the configuration.

[0009] Generally, the tension of the wire being fed to the reel varies depending on the shape of the reel that is rotated and the speed at which the wire being wound onto the reel moves. The degree of slack in the wire changes depending on the shape of the reel and the speed at which the wire moves. In addition, when the reel has a large aspect ratio, the speed at which the wire moves changes suddenly, which increases the amount of slack in the wire.

[0010] The winding tension control device of the present invention is provided in the middle of the path that supplies wire from a wire supply source to a reel. A detour path is provided in the middle of the path along which the wire passes. Here, the detour path refers to a route that takes a roundabout route, or a long way around. The winding tension control device of the present invention is provided in the long way around the path.

[0011] When the tension of the wire rod fed to the reel increases, the spring member bends against the tension, reducing the effective radius of rotation of the guide portion on the radially outer side of the bending spring member. Therefore, tension control works in the direction of decreasing (relaxing) the tension as the amount of bending of the spring member increases. Conversely, when the tension of the wire being fed to the reel decreases, the amount of deflection of the spring member decreases and the effective radius of rotation of the guide portion increases, thereby suppressing slack in the wire. Therefore, the tension is controlled in the direction of increasing the tension.

[0012] The winding tension control device of the present invention follows the change in tension acting on the wire being wound around the reel with high responsiveness and little delay, thereby reducing the fluctuation in tension. A spring member, one end of which is fixed to a boss portion that can rotate freely relative to the base, is flexible, and a wire is wound around the guide portion at the other end of this spring member, causing the boss portion to rotate at a rotational speed that basically corresponds to the moving speed of the wire.

[0013] In the looped path formed by a detour from the path along which the wire travels, fluctuations in the speed of the wire (acceleration or deceleration) mitigate fluctuations in the amount of deflection of the spring member supporting the guide section around which the wire is wound, increasing the amount of deflection of the spring member when the tension in the wire increases and decreasing the amount of deflection of the spring member when the tension in the wire decreases, thereby preventing excessive tension and excessive slack in the wire. According to the winding tension control device of the present invention, it is possible to suppress fluctuations in the tension of the wire with a compact configuration while reducing the load on the route along which the wire passes. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view of a winding tension control device used in the first embodiment; [Figure 2] FIG. 1 is a perspective view of a winding tension control device according to a first embodiment; [Figure 3] FIG. 2 is a partial front view showing the operation of the winding tension control device of FIG. [Figure 4] A schematic configuration diagram of a first embodiment; [Figure 5] FIG. 2 is a diagram showing the relationship between the reel rotation angle and the wire moving speed, and the relationship between the reel rotation angle and the winding start position on the reel; [Figure 6] An explanatory diagram of the operation of the first comparative embodiment; [Figure 7] FIG. 10 is an explanatory diagram of the operation of the second comparative embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a winding tension control device and a control method according to an embodiment of the present invention will be described with reference to the drawings. Note that, in multiple embodiments, substantially the same components are given the same reference numerals, and descriptions thereof will be omitted.

[0016] (First embodiment) A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4, the first embodiment includes a tension applying unit 4 that applies tension to a wire 3 supplied from a bobbin 2 corresponding to a wire supply source, a nozzle 6 that determines the ejection position of the wire 3 supplied from the tension applying unit 4, a reel 8 that winds the wire 3 supplied from the nozzle 6, and a drive source (not shown) that rotates the reel 8 in the direction of arrow 7 around a rotation center 9.

[0017] The winding tension control device 1 is provided in a path through which the wire passes between the outlet of the tension applying unit 4 and the inlet of the nozzle 6. The reel 8 has short sides 82 and 83 and long sides 84 and 85 centered around a rotation axis 9, and receives a driving force from the driving source to rotate in the direction of arrow 7 around the rotation center 9. As the reel 8 rotates, the wire 3 is wound around the outer peripheral wall of the reel 8, forming a winding on the outer peripheral wall of the reel 8.

[0018] The distance between the rotary shaft 9 of the reel 8 and the nozzle 6 is basically constant. The moving speed (wire speed) of the wire 3 supplied to the reel 8 varies depending on the rotation angle of the reel 8, which has short sides 82, 83 and long sides 84, 85. The distance between the contact point 81 with the reel 8 and the tip of the nozzle 6 changes depending on the rotation angle of the reel 8.

[0019] The wire 3 to be wound around the bobbin 2 passes through a tension applying unit 4 and a winding tension control device 1, and is ejected from a nozzle 6 and wound around a reel 8. A first tension (tensile force) is applied to the wire 3 by the tension applying unit 4, and then a second tension is applied by the winding tension control device 1 shown in FIGS. A wire 3 supplied from a winding tension control device 1 through a nozzle 6 is wound onto a reel 8 which rotates in one direction as indicated by an arrow 7 around a rotation center 9 .

[0020] The reel 8 has short side surfaces 82 and 83 and long side surfaces 84 and 85. The speed at which the wire 3 is drawn in and wound around the wall (wire speed) fluctuates. More details will be given later. The winding tension control device 1 is provided in the middle of the path along which the wire 3 passes between the tension applying unit 4 and the nozzle 6, on a loop-shaped path (circumferential path) that makes the path of the wire take a roundabout route.

[0021] As shown in Figures 1 and 2 (wire not shown), the winding tension control device 1 has rollers 13 and 14 that are freely rotatably supported by bearings 11 and 12 fixed to a base 10, and the wire 3 is wound around these rollers 13 and 14 to form a loop-shaped circuitous path 15 that makes the wire take a long detour.

[0022] A bearing 17 is provided on the base 10 at a position below the gravity of the rollers 13 and 14, and a disk-shaped boss portion 18 is supported on the bearing 17 so as to be rotatable in the direction of an arrow 19. Each end 201 of leaf springs 20, which correspond to a plurality of spring members, is fixed at equal intervals in the circumferential direction to the outer peripheral wall of boss portion 18. Leaf springs 20 extend at an angle in an eccentric direction that deviates from the radially outward direction from a position eccentric to the center position of boss portion 18. Leaf springs 20 extend in a direction that makes them more likely to bend under external force, so as to increase their effective elastic modulus.

[0023] The leaf springs 20 are thin, elongated plates, each extending radially from the outer circumferential surface of the boss 18, with the other ends 202 of the leaf springs 20 fixed to the guide portions 30, respectively. The guide portion 30 has a base 32 having a support surface 31 that supports the wire 3, and guide plates 33, 34 that rise radially outward from both widthwise edges of the leaf spring 20 relative to the base 32. The multiple guide portions 30 are fixed to the respective tips (other ends 202) of the multiple leaf springs 20 that extend radially from the boss portion 18, and are arranged circumferentially around the boss portion 18.

[0024] As shown in FIG. 4, the wire 3 drawn out from the bobbin 2 passes through the tension applying unit 4, and moves from the roller 13 along a circuitous path 15 in the direction from the roller 14 to the nozzle 6. In the circuitous path 15, when the wire 3 wound around the guide parts 30 comes into contact with the support surfaces 31 of the guide parts 30, a frictional force (external force) acts, causing the guide parts 30 to rotate around the central axis (boss part 18), and the length of the circuitous path becomes variable due to the deflection of the leaf springs 20. This makes it possible to suppress fluctuations in the tension of the wire 3.

[0025] As shown in Figure 3, when the tension acting on the wire is relatively high, the amount of deflection of the leaf spring 20 increases, and the leaf spring 20 is located at the position of the guide portion 30 shown by the solid line 30, for example. When the moving speed of the wire decreases, the inertial force of the guide portion 30 returns (restores) the position of the leaf spring 20 in the direction of arrow 36, and the guide portion 30 moves in a direction returning the guide portion 30 from the position shown by the solid line to the position shown by the dashed line, and the guide portion 30 essentially moves radially outward (increasing the effective radius of the guide portion). This extends the length of the circuitous path of the wire and prevents the wire from loosening.

[0026] In this embodiment, by arranging the guide parts so that the circuitous route is in a loop shape, it is possible to reduce an increase in the route load. According to this embodiment, the spring is connected to the tip of the leaf spring, guides the winding in the circumferential direction, and is stretched or loosened by the tension of the winding, thereby adjusting the tension of the winding.

[0027] According to this embodiment, since a plurality of leaf springs are arranged on the circumference, it is possible to follow a large amount of slack with high responsiveness and reduce the path load. In this embodiment, the center of the rotating body is held by a bearing, and as the wire is wound up, the boss portion 18, the plurality of leaf springs 20, and the plurality of guide portions 30 rotate in accordance with the wire speed of the wire. Acceleration and deceleration during rotation generate inertial force in the guide portions 30 at the tip, and as the tension on the wire 3 loosens, the amount of deflection of the leaf springs 20 decreases, causing the guide portions 30 to expand and prevent loosening.

[0028] According to this embodiment, when tension is applied to the wire 3, the leaf spring 20 bends, and the guide portion 30, leaf spring 20 and boss portion 18 rotate freely together in accordance with the speed at which the wire 3 moves. By arranging the guide portion 30 circumferentially around the center of rotation, the leaf spring 20 deforms due to bending when it flexes, making it possible to reduce the increase in the load on the path. When the wire travel speed decreases, the rotation speed of the roller 14 also decreases, and the inertial force of the guide portion 30 located near the roller 14 at that time moves the leaf spring 20 in the return direction. This prevents the wire from loosening.

[0029] Next, the general relationship between the moving speed of a wire rod fed to a reel having long and short sides and the reel rotation angle will be explained with reference to Fig. 5. Fig. 5 is an image diagram to help understand the present invention. The horizontal axis in Fig. 5 indicates the reel rotation angle from 0° to 180°. The upper part of Fig. 5 shows the reel rotation position corresponding to the reel rotation angle.

[0030] The upper part of Figure 5 shows the relationship between the rotation angle of the reel, the rotation position of the reel, and the winding position of the wire at the reel entrance. The graph in the lower part of Figure 5 shows the relationship between the rotation angle of the reel and the wire movement speed (shown as "wire speed" in Figure 5), as well as the reel rotation angle ranges for long-side winding and short-side winding.

[0031] Long side winding begins at rotational position 801 of the reel 8, and as the angle advances, the wire becomes loose and the wire movement speed gradually decreases (wire speed reduction). The wire movement speed is further reduced via rotational position 802 of the reel. Long side winding continues on the reel from a rotational angle of 0° of the reel 8 to rotational position 803, where the wire movement speed is at its lowest.

[0032] When switching from long side winding to short side winding, the tension of the wire increases rapidly as the angle advances, and the moving speed of the wire increases rapidly (wire speed increase), passing through rotation position 804, and after reaching the maximum speed of the wire, moving to rotation position 805. Subsequently, similar changes in the winding state of the wire are repeated from the rotation position 801.

[0033] The above-described embodiment operates to relieve excess slack and tension in the wire in response to slowing and increasing the wire travel speed. As shown in FIG. 5, the moving speed of the reel 8 for the wire 3 supplied from the nozzle 6 at the entrance of the reel 8 changes depending on the winding start positions 801, 802, 803, 804, and 805 of the wire.

[0034] The wire rod movement speed gradually decreases from winding start position 801 where the initial reel rotation angle is 0°, and reaches its minimum at winding start position 803. It then reaches its maximum movement speed on the way to winding start position 804. The average movement speed (average wire speed) of the wire rod is as shown in the figure. In general, the wire rod movement speed decreases during the long side winding period, and increases during the short side winding period.

[0035] According to this embodiment, in a winding supply device that has the general relationship that causes fluctuations in the moving speed of the wire, the device of the above embodiment is provided at the entrance side where the wire is supplied to the reel, thereby suppressing fluctuations in the wire tension of the winding device, thereby enabling appropriate aligned winding of the wire.

[0036] Next, the present invention will be described in comparison with a comparative embodiment.

[0037] (Comparison with the first comparative form) The first comparative embodiment 1 shown in Fig. 6 is an example in which a tension control device that causes a large amount of deflection of the spring 50 is provided in the path for supplying the wire rod 3. In Fig. 6, components that are substantially the same as those shown in the above embodiment are denoted by the same reference numerals as those in the drawings showing the above embodiment.

[0038] In the first comparative example shown in Fig. 6, when a sudden change (e.g., sudden deceleration) occurs in the moving speed of the wire, the amount of slack that occurs in the wire increases. To reduce this slack, the fluctuation amount (deflection amount) of the spring 50 is increased to follow the amount of slack in the wire. A free roller 51 is provided at the tip of the spring 50. In this case, as the winding (moving speed of the wire) increases in speed, the period of tension fluctuation decreases, so high responsiveness is required of the spring 50. If the spring constant is increased to improve responsiveness, the spring 50 must be operated with a small vibration, which makes it difficult to adopt this example in practice.

[0039] (Comparison with the second comparative form) The second comparative embodiment shown in Fig. 7 is an example in which a plurality of tension control devices using a plurality of springs 55, 56, 57 are provided in the path for supplying the wire 3. In Fig. 7, components that are substantially the same as those shown in the above embodiment are denoted by the same reference numerals as those in the drawings showing the above embodiment.

[0040] This second comparative example is an example in which multiple springs 55, 56, and 57 are used. In this case, multiple (three) springs 55, 56, and 57 are provided to reduce slack in the wire, which causes a problem of increased load within the wire path. The wire path may bend at multiple points, or the rotational resistance due to the multiple (three) rollers 51 may increase, increasing the path load.

[0041] In comparison with the above two comparative embodiments, the embodiment of the present invention has the following advantages. Generally, there are environmental changes such as the shape of the reel, the phase of the drive unit, the moving speed of the wire, and the magnitude of the tension applied by the tension applying unit. The winding tension control device of the present invention adjusts the slack in the wire rod so as to reduce fluctuations in the slack between the exit of the tension applying section and the entrance of the winding frame, thereby restricting the tension of the wire rod at the entrance of the winding frame within a predetermined range, thereby suppressing fluctuations in tension and enabling appropriate winding control such as aligned winding of the wire.

[0042] According to the winding tension control device of the present invention, a circuitous (detour) route is formed for the wire between the exit of the tension applying section and the entrance of the reel, and the length of this circuitous route is variable. Furthermore, the circuitous route for the wire is formed by freely rotating guide sections, resulting in a slack adjustment device with a highly responsive configuration that responds to sudden changes in the wire's moving speed by deflecting a spring member. The configuration includes a guide section group formed by multiple guide sections, a freely rotating rotor, and an effective radius of this rotor that is adjusted by deflecting a spring, thereby reducing the route load. This reduces the fluctuation range of the wire tension at the entrance of the reel, enabling appropriate winding control, such as aligned winding.

[0043] (Other embodiments) In the above embodiment, the shape of the reel has been described as having short sides and long sides, but the present invention can be applied to a reel around which a wire is wound having an outer peripheral surface with any outer contour shape in the circumferential direction. In the above embodiment, an example of a leaf spring used in the winding tension control device 1 is shown, but in the present invention, instead of a leaf spring, a coil spring, a spring made up of multiple leaf springs stacked on top of each other, or a thin plate having a rectangular, triangular, trapezoidal, or other shape may also be used.

[0044] In the above embodiment, an example in which one wire is used has been described, but in the present invention, the number of wires may be one or more. In addition, the material of the wire is not specified in the present invention. In the present invention, a nozzle (6) can be provided between the tension applying section and the reel. In the present invention, multiple spring members are arranged circumferentially, and are free to rotate, allowing for a wide range of rotational speeds. This has the effect of preventing the device from becoming too large, while also allowing the average moving speed of the wire to adapt to fluctuations in the moving speed over a wide range of speeds, from low to high.

[0045] As described above, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit and scope of the present invention. The winding tension control device of the present invention has the spring member, one end (201) of which is fixed to the boss portion and the other end (202) of which is fixed to the guide portion. By increasing or decreasing the amount of deflection of the spring member, the effective radius, which is the distance between the position of the central axis of the boss portion and the position of the guide portion, can be varied, and the tension of the wire supplied to the reel can be increased or decreased.

[0046] The winding tension control device of the present invention can be provided in the wire supply path between the reel that winds the wire and the wire supply source (2) that supplies the wire to the reel. Although the winding tension control device 1 of this embodiment has been shown as an example of the guide portion 30, it is preferable that the number of spring members corresponding to the number of guide portions is four or more. In order to function as a mechanical configuration, it is preferable to provide four or more spring members.

[0047] The winding tension control method of the present invention is a winding method that suppresses fluctuations in the tension of the wire wound around a rotating reel (8), and forms a circuitous path (15) for the wire to be supplied to the reel, making the length of the circuitous path variable, thereby suppressing fluctuations in the winding speed at the inlet side of the reel.

[0048] The winding tension control method of the present invention forms the circuitous path in a loop shape within the path of the wire, arranges multiple guide parts around which the wire is wound around the circumference of the loop, and rotates boss parts on the rotation center side of spring members that support each of these multiple guide parts, making it possible to vary the actual length of the loop path or the effective radius of the loop path depending on the amount of deflection of the spring members.

[0049] The winding tension control method of the present invention can reduce the amount of deflection of the spring member (20) when the wire feed speed decreases, thereby increasing the effective radius of the loop path. The winding tension control method of the present invention can shorten the loop path length by increasing the amount of deflection of the spring member when the tension of the wire is high. [Explanation of symbols]

[0050] 1. Winding tension control device 2 Bobbin (wire supply source) 3 wire rod 6 nozzles 8 Reel 9 Rotation axis (central axis) 10 Foundation 13, 14 Laura 15 Circuitous Route 18 Boss Section 20 Leaf spring (spring component) 30 Guide section

Claims

1. A winding tension control device (1) provided in a path for supplying a wire to a winding frame (8), A base (10); a boss portion (18) supported on the base so as to be freely rotatable about a central axis (9); a plurality of leaf springs (20) extending radially from the boss portion; a plurality of guide portions (30) fixed to the tips of the plurality of leaf springs and arranged on the circumference; One end (201) of the leaf spring is fixed to the boss portion, and the other end (202) is fixed to the guide portion, the leaf spring extends obliquely in an eccentric direction deviating radially outward from a position eccentric to the center position of the boss portion, When the plurality of guide portions come into contact with the wire wound around the guide portions, an external force acts on the plurality of guide portions, causing the plurality of guide portions to rotate around the central axis, and the tension fluctuation of the wire is suppressed by the deflection of the leaf spring. A winding tension control device that varies the effective radius, which is the distance between the position of the central axis of the boss portion and the position of the guide portion, by increasing or decreasing the amount of deflection of the leaf spring, thereby adjusting the tension of the wire supplied to the winding frame.

2. A tension control device for windings as described in Claim 1, wherein the multiple leaf springs are inclined in the same direction at the same inclination angle relative to the radial direction of the boss portion.

3. A tension control device for windings as described in Claim 1, wherein the plurality of leaf springs have one end arranged at equal intervals around the circumferential direction of the boss portion.

4. A winding tension control device as described in claim 1, wherein the plurality of leaf springs have guides that correspond one-to-one to the leaf springs.

5. 2. The winding tension control device according to claim 1, which is provided between a reel for winding a wire and a wire supply source for supplying the wire to the reel.

6. 3. The winding tension control device according to claim 1, wherein the plurality of leaf springs are four or more leaf springs.

Images