Stranding device

Abstract

Provided is a stranding device capable of increasing the number of stranded portions at the tail end of a stranded cable by stranding unstranded portions. A twist adding device (1) includes a chuck portion (18) that clamps an untwisted portion (yh) of a twisted cable (2), the untwisted portion (2) including a twisted portion (ts) in which a pair of electric wires (2a, 2b) are twisted and an untwisted portion (yh) in which the pair of electric wires (2a, 2b) are not twisted. Furthermore, the twisting device (1) includes a chuck portion (36) that sandwiches a boundary portion of the twisted portion (ts) that is adjacent to the non-twisted portion (yh), and a motor (12) that rotates the chuck portion (18) in a direction in which the non-twisted portion (yh) is twisted so that the non-twisted portion (yh) continues from the twisted portion (ts).

Description

Technical Field

[0001] The present invention relates to a twisting device for twisting together the untwisted portions at the ends of a twisted cable made by twisting a pair of wires together. Background Technology

[0002] Various stranded cable manufacturing apparatuses have been proposed for manufacturing stranded cables by twisting two wires together. For example, Patent Document 1 describes the following stranded cable manufacturing apparatus. The stranded cable manufacturing apparatus described in Patent Document 1 includes a first intermittent rotating component, a second intermittent rotating component, and a drive unit. The first intermittent rotating component has clamps on three circumferential surfaces, each clamping one end of a pair of wires. The second intermittent rotating component has clamps on three circumferential surfaces, each clamping the other end of a pair of wires, and a motor that rotates the clamps circumferentially. The drive unit causes the first and second intermittent rotating components to rotate one-third of a full revolution intermittently. The three surfaces include a surface for setting the pair of wires, a surface for twisting the pair of wires, and a surface for winding and releasing the twisted cable.

[0003] Existing technology

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. JP2012028197A Summary of the Invention

[0006] The problem to be solved by this invention

[0007] Typically, in stranded cables manufactured by the manufacturing apparatus described in Patent Document 1, unstretched portions are formed at both ends. If the length of the unstretched portions is too long, the noise characteristics of the stranded cable will deteriorate.

[0008] In the manufacturing apparatus described in Patent Document 1, a rotor is disposed between a first intermittent rotating member and a second intermittent rotating member, and the wires are twisted together by a stranding rod included in the rotor. Therefore, the untwisted portion needs to be of a length corresponding to the rotor, making it difficult to shorten the untwisted portion in the manufacturing apparatus disclosed in Patent Document 1.

[0009] Therefore, the present invention was made in view of the above-mentioned problems, and the object of the present invention is to provide a twisting device that can increase the twisted portion at the end of a stranded cable by twisting the untwisted portion.

[0010] Technical solution

[0011] To address the aforementioned problems, the present invention provides a stranding device, comprising: a first clamping portion that clamps an unstretched portion of a stranded cable, the stranded cable including a stranded portion of a pair of wires twisted together and an unstretched portion of the pair of wires not twisted together; a second clamping portion that clamps a boundary portion of the stranded portion adjacent to the unstretched portion; and a rotation driving unit that rotates the first clamping portion in the direction of stranding the unstretched portion, such that the unstretched portion continues from the stranded portion.

[0012] Technical effect

[0013] According to the present invention, since the unstretched portion at the end of the stranded cable can be twisted, the noise characteristics of the stranded cable can be improved. Attached Figure Description

[0014] [ Figure 1 ] Figure 1 This is a perspective view of a twisting device according to an embodiment of the present invention.

[0015] [ Figure 2 ] Figure 2 It is viewed from different angles. Figure 1 A perspective view of the twisting device shown.

[0016] [ Figure 3 ] Figure 3 yes Figure 1 The diagram shows a perspective view of the twisting device, with the chuck section in the open position.

[0017] [ Figure 4 ] Figure 4 yes Figure 1 A perspective view of the chuck portion of the first clamping device shown.

[0018] [ Figure 5 ] Figure 5 yes Figure 1 Front view of the chuck portion of the first clamping device shown.

[0019] [ Figure 6 ] Figure 6 yes Figure 1 A perspective view of the chuck portion of the second clamping device shown.

[0020] [ Figure 7 ] Figure 7 yes Figure 1 Front view of the chuck portion of the second clamping device shown.

[0021] [ Figure 8 ] Figure 8 yes Figure 1 The flowchart shows the twisting operation of the twisting device.

[0022] [ Figure 9 ] Figure 9 This is a view showing the state before twisting.

[0023] [ Figure 10 ] Figure 10 This is a view showing the state after twisting.

[0024] [ Figure 11 ] Figure 11 This is an illustrative diagram used to calculate the length of a wire with one pitch.

[0025] Reference tag list

[0026] 1. Winding device

[0027] 2. Stranded cable

[0028] 10 First clamping device

[0029] 12 Motors (Rotary Drive Units)

[0030] 18. Chuck section (first clamping section)

[0031] 30 Second clamping device

[0032] 32 orbits

[0033] 33 moving units

[0034] 36 Chuck section (second clamping section)

[0035] 50. Control device (computing unit)

[0036] TS Hinged section

[0037] yh Untwisted part Detailed Implementation

[0038] An embodiment of the present invention will now be described with reference to the accompanying drawings. Figures 1 to 3 This is a perspective view of a twisting device according to an embodiment of the present invention. Figure 1 and Figure 2 The chuck section in its closed state is shown, as described later, and Figure 3 The chuck section is shown in the open position.

[0039] First, the stranded cable 2 will be described, and the stranding of the stranded cable 2 will be increased by the stranding device 1 according to this embodiment. Figure 3 As shown and described later Figure 9In the stranded cable 2 that has not yet been processed by the twisting device 1, there is a stranded portion ts in which wires 2a and 2b are twisted together, and an untwisted portion yh in which wires 2a and 2b are not twisted. The untwisted portion yh is formed at the end of the stranded cable 2 and is continuous with the stranded portion ts. In this embodiment, "twisting" means twisting the untwisted portion yh to shorten its length compared to before processing.

[0040] Figure 1 The stranding device 1 shown in the other figures includes: a first clamping device 10 that clamps the unstretched portion yh of the stranded cable 2 (described later); a second clamping device 30 that clamps the boundary portion of the stranded portion ts of the stranded cable 2 (described later) adjacent to the unstretched portion yh; and a control device 50.

[0041] The first clamping device 10 includes a bracket 11, a motor 12, a drive pulley 13, a driven pulley 14, an annular belt 15, a support column 16, a sliding part 17, and a chuck part 18.

[0042] The bracket 11 fixes the motor 12 and rotatably supports the drive pulley 13 and the driven pulley 14.

[0043] The motor 12 is fixed to the bracket 11 and rotates the drive pulley 13. An annular belt 15 is mounted between the drive pulley 13 and the driven pulley 14. Therefore, when the drive pulley 13 rotates, the driven pulley 14 also rotates via the annular belt 15. As described later, the rotation of the driven pulley 14 causes the chuck portion 18 to rotate. That is, the motor 12 acts as a rotation drive unit, which rotates the chuck portion 18 (first clamping portion) in the following direction: winding the unwound portion yh so that the unwound portion yh continues the winding portion ts.

[0044] A support post 16 is mounted to a driven pulley 14. The support post 16 rotates as the driven pulley 14 rotates. A sliding portion 17 is provided at the end of the support post 16. The sliding portion 17 is formed in a flat rectangular shape and has a groove formed on the surface opposite to the surface engaged with the support post 16. The clamping members 19 and 20 of the chuck portion 18 engage with the groove of the sliding portion 17, allowing the clamping members 19 and 20 to slide toward and away from each other. The sliding of the sliding portion 17 causes the chuck portion 18 to open and close. The opening and closing of the chuck portion 18 is controlled by a control device 50.

[0045] As described above, the chuck portion 18 includes a clamping member 19 and a clamping member 20. The clamping member 19 and the clamping member 20 are as follows... Figure 4 and Figure 5 As shown. Figure 4 This is a perspective view of clamping component 19 and clamping component 20. Figure 5This is a front view of clamping component 19 and clamping component 20.

[0046] The clamping member 19 includes a front portion 19a, a rear portion 19b, a wire clamping member 19c, and a rib 19d. The front portion 19a includes a surface 19a1 and a surface 19a2. Surface 19a1 forms the front surface of the chuck portion 18 (the side facing the second clamping device 30), and surface 19a2 is formed on the rear side of surface 19a1 (the side that contacts the wire clamping member 19c). Surface 19a1 is formed in an approximately W-shape, and surface 19a2 is formed in an approximately M-shape. Therefore, the front portion 19a has alternating W-shaped vertices and M-shaped vertices protruding toward the clamping member 20.

[0047] Similar to the front part 19a, the rear part 19b also has a surface formed in an approximately W shape and a surface formed in an approximately M shape. The rear part 19b is provided with a gap between it and the front part 19a.

[0048] The wire clamping component 19c is configured to clamp between the front portion 19a and the rear portion 19b. In this embodiment, the wire clamping component 19c is formed of polyurethane into a generally rectangular shape. This configuration ensures that force is applied evenly to both wires, preventing a situation where the wire clamped first experiences greater force while the other wire is loosely clamped due to errors in wire diameter or other factors.

[0049] Rib 19d fits into the groove of sliding part 17, so that clamping member 19 can slide in the extending direction of sliding part 17.

[0050] The clamping member 20 has the same structure as the clamping member 19. The clamping member 20 includes a front portion 20a, a rear portion 20b, a wire clamping member 20c, and a rib 20d. The front portion 20a includes a surface 20a1 and a surface 20a2. Surface 20a1 forms the front surface of the chuck portion 18 (the side facing the second clamping device 30), and surface 20a2 is formed on the rear side of surface 20a1 (the side that contacts the wire clamping member 20c). Surface 20a1 is formed in an approximately W-shape, and surface 20a2 is formed in an approximately M-shape. Therefore, the front portion 20a has alternating W-shaped vertices and M-shaped vertices protruding toward the clamping member 19.

[0051] Similar to the front part 20a, the rear part 20b also has a surface formed in an approximately W shape and a surface formed in an approximately M shape. The rear part 20b is provided with a gap between it and the front part 20a.

[0052] The wire clamping component 20c is configured to be clamped between the front part 20a and the rear part 20b. Similar to the wire clamping component 19c, the wire clamping component 20c is formed of polyurethane in a generally rectangular shape.

[0053] Rib 20d fits into the groove of sliding part 17, so that clamping member 20 can slide in the extending direction of sliding part 17.

[0054] The chuck portion 18 positions the wires 2a and 2b in the two valleys 20a3 of the W-shape of the front portion 20a of the clamping member 20, and clamps the wires 2a and 2b by interlocking the W-shaped and M-shaped portions of the clamping member 19 and the clamping member 20 with each other using the wire clamping members 19c and 20c.

[0055] As can be clearly seen from the above description, the chuck portion 18 serves as the first clamping portion for clamping the unstretched portion yh of the stranded cable 2. The chuck portion 18 simultaneously (as a bundle together) clamps a pair of wires 2a and 2b.

[0056] like Figures 1 to 3 As shown, the second clamping device 30 includes a base 31, a track 32, a moving unit 33, a support column 34, a sliding part 35, and a chuck part 36.

[0057] The base 31 is formed in the shape of a flat plate. A track 32 is disposed on the base 31. A pair of tracks 32 are arranged to extend on the base 31, so that the moving unit 33 can move toward and away from the first clamping device 10.

[0058] As described above, the moving unit 33 is capable of moving along the track 32. A support column 34 stands upright on the moving unit 33, and a sliding portion 35 is provided at the upper end of the support column 34. The sliding portion 35 is formed in a flat cuboid shape and has a groove formed on the surface opposite to the surface engaged with the support column 34. The clamping members 37 and 38 of the chuck portion 36 engage with the grooves of the sliding portion 35, allowing the clamping members 37 and 38 to slide towards and away from each other. The sliding of the sliding portion 35 causes the chuck portion 36 to open and close. The opening and closing of the chuck portion 36 is controlled by the control device 50.

[0059] As described above, the chuck portion 36 includes a clamping member 37 and a clamping member 38. The clamping member 37 and the clamping member 38 are as follows... Figure 6 and Figure 7 As shown. Figure 6 This is a perspective view of clamping component 37 and clamping component 38. Figure 7 This is a front view of clamping component 37 and clamping component 38.

[0060] The clamping member 37 includes a comb-shaped portion 37a and ribs 37b. The comb-shaped portion 37a is provided with a plurality of comb teeth arranged in the extension direction of the stranded cable 2, each comb tooth having a V-shaped groove formed therein. The comb-shaped portion 37a positions the stranded cable 2 within the V-shaped groove.

[0061] Rib 37b fits into the groove of sliding part 35, so that clamping member 37 can slide in the extending direction of sliding part 35.

[0062] The clamping member 38 has the same structure as the clamping member 37. The clamping member 38 includes a comb-shaped portion 38a and ribs 38b. The comb-shaped portion 38a is provided with a plurality of comb teeth arranged in the extension direction of the stranded cable 2, each comb tooth having a V-shaped groove formed therein. The comb-shaped portion 38a positions the stranded cable 2 within the V-shaped groove.

[0063] The stranded cable 2 is clamped by the alternating engagement of the comb portion 37a of the clamping member 37 and the comb portion 38a of the clamping member 38.

[0064] Rib 38b fits into the groove of sliding part 35, so that clamping member 38 can slide in the extending direction of sliding part 35.

[0065] As can be clearly seen from the above description, the chuck portion 36 serves as a second clamping portion, which clamps the boundary portion of the twisted portion ts adjacent to the untwisted portion yh. Furthermore, the moving unit 33 is capable of moving the chuck portion 36 (the second clamping portion) closer to the chuck portion 18 (the first clamping portion).

[0066] The control device 50 is composed of a control device, such as one equipped with a microcomputer. The control device 50 controls the opening and closing of the chuck sections 18 and 36. Furthermore, the control device 50 calculates the number of rotations (increased number of twists) of the chuck section 18 based on the length of the untwisted portion yh of the stranded cable 2, and causes the motor 12 to rotate accordingly at the calculated number of rotations.

[0067] Next, refer to Figure 8 The flowchart illustrates the twisting operation of the twisting device 1 with the above-described structure.

[0068] First, the twisted cable 2 is placed (step S1). The control device 50 opens the chuck sections 18 and 36. Then, the untwisted portion yh of the twisted cable 2, which is the target of twisting, is placed in the chuck section 18, and the twisted portion ts is placed in the chuck section 36. Here, preferably, the twisted cable 2 is placed in the chuck section 36 such that the boundary portion between the twisted portion ts and the untwisted portion yh (also called the untwisted intersection) is located at the foremost part of the comb sections 37a and 38a (i.e., the side facing the first clamping device 10). The untwisted intersection can also be detected based on an image captured by an imaging unit provided above the twisting device 1.

[0069] Step S1 can be performed manually by placing the stranded cable 2, but it can also be performed automatically from another location, such as from a manufacturing device used to manufacture the stranded cable 2, using a conveying device or the like. When automatically conveying the stranded cable 2, it is preferable to apply back tension to the stranded cable 2.

[0070] Next, the wire is clamped (step S2). The control device 50 closes the chuck sections 18 and 36 to clamp the untwisted portion yh and the twisted portion ts. After the twisted portion ts is clamped by the chuck section 36, no back tension is applied.

[0071] Next, the control device 50 calculates the number of rotations of the chuck section 18 (step S3). Details regarding the calculation of the number of rotations will be described later. This number of rotations refers to the number of rotations of the chuck section 18 required to perform twisting at the same twisting pitch as the twisting section ts.

[0072] Next, the control device 50 operates the motor 12 to rotate the chuck section 18 by the number of rotations calculated in step S3 (step S4). As a result, the wires 2a and 2b between the chuck section 18 and the chuck section 36 are twisted together (twisted) due to the rotation of the chuck section 18. At this time, the chuck section 36 moves toward the chuck section 18 in response to the twisting. In other words, due to the twisting force, the chuck section 36 is pulled, and the moving unit 33 moves along the track 32. Figure 1 The moving unit 33 is configured to move in the direction indicated by the middle arrow. That is, the moving unit 33 is configured to move so that the chuck part 36 (second clamping part) moves closer to the chuck part 18 (first clamping part) as the chuck part 18 (first clamping part) rotates.

[0073] Then, the clamp on the wire is released (step S5). The control device 50 opens the chuck sections 18 and 36. Then, the twisted cable 2 is transferred to the next step, such as terminal crimping. As in step S1, the transfer to the next step can be done manually or by automatic conveying.

[0074] Here, we will refer to Figures 9 to 11 Explain the method for calculating the number of rotations described in step S3. Figure 9 and Figure 10 The wires 2a and 2b (stretched cables 2) are shown being held by the chuck portions 18 and 36 of the twisting device 1. Figure 9 The state before twisting is shown, and Figure 10 The state after twisting is shown.

[0075] Here, "A" indicates the clamping position of the chuck section 18, representing the distance from the ends of wires 2a and 2b to the front parts 19a and 20a. "F" indicates the distance from the ends of wires 2a and 2b to the single-wire chuck. A single-wire chuck is a device that clamps wires when moving wires, such as using an automatic conveyor. The distance F is obtained by adding the distance A to the additional length required to clamp wires 2a and 2b before and after the twisting operation. The values ​​A and F are predetermined based on the device's construction. If a single-wire chuck is not used, F can be considered equal to A.

[0076] “G” indicates the spacing between the wires at the chuck section 18. The value G is a predetermined value based on the construction of the chuck section 18. “P” (see…) Figure 10 ) represents the length of each pitch of the strand (stretch pitch). In this embodiment, "P" is set to the center value of a predetermined tolerance. Y (see...) Figure 10 ) indicates the length of the untwisted portion yh (untwisted length). "Y" represents the fixed value specified by the standard. "L" (see...) Figure 9 The symbol “L” indicates the distance between chuck section 18 and chuck section 36. “L” also indicates a predetermined value based on the construction of the twisting device 1.

[0077] Using the above values ​​as input, calculate the following values. First, calculate the length La of the wire from chuck section 18 to chuck section 36 (see...). Figure 9 ). Calculate the length La using the following equation (1).

[0078] [Mathematical Expression 1]

[0079]

[0080] Next, calculate the total wire length Lb, including the portion held by the chuck section 18, of the untwisted portion (see...). Figure 9 ). Calculate the total wire length Lb using the following equation (2).

[0081] [Mathematical Expression 2]

[0082]

[0083] Next, based on the above input values, the length Yt of the untwisted portion yh after twisting is calculated (see...). Figure 10 ). Calculate the length Yt using the following equation (3).

[0084] [Mathematical Expression 3]

[0085]

[0086] Next, the wire length Pt for each pitch is calculated based on the above input values. The wire length Pt is calculated using the following equation (4). In equation (4), “d” represents the outer diameter of the wire. Here, reference will be made to... Figure 11 Explain the method for calculating the length of the wire at each pitch. Figure 11 The left side shows one pitch of stranded cable 2. The centerline of the stranded wire follows a helical path, as if wound around a cylinder with a radius of d / 2. Figure 11 (The center line). When the cylinder is unfolded, this center line becomes the diagonal of the resulting rectangle (the center line). Figure 11 (The right side). Therefore, by calculating the length of this diagonal, the length of the wire for each pitch can be obtained.

[0087] [Mathematical Expression 4]

[0088]

[0089] Next, calculate the length Lt of the twisted wire. The length Lt of the wire is calculated using the following equation (5).

[0090] [Mathematical Expression 5]

[0091]

[0092] Next, calculate the number of twists Nt'. Use the following equation (6) to calculate the number of twists Nt'.

[0093] [Mathematical Expression 6]

[0094]

[0095] Next, the twist number Nt' calculated in equation (6) is integerized. The integerized twist number is Nt. For example, this integerization can be performed by rounding to the nearest integer (i.e., rounding the first digit after the decimal point). This integerization is necessary because the smallest unit of rotation of the chuck section 18 is a complete full rotation.

[0096] Next, calculate the unstretched length Ys based on the integerized number of strands. Use the following equation (7) to calculate the unstretched length Ys.

[0097] [Mathematical Expression 7]

[0098]

[0099] Next, the number of twists is recalculated using the untwisted length Ys calculated by equation (7). Specifically, in equation (5), the untwisted length Ys is used instead of the length Yt, and the result is substituted into equation (6). Then, the number of twists Nt' calculated by equation (6) is integerized to obtain the number of twists Nts. Here, regarding the untwisted length Ys and the untwisted length Y (input value) calculated by equation (7), if Ys>Y, then Nts is set to Nt'+1, and if Ys≤Y, then Nts is set to Nt'. In this way, the number of twists Nts can be calculated.

[0100] Then, the number of turns Nr of the chuck section 18 is set to the number of turns Nts plus 1.

[0101] Thus, the control device 50 serves as a calculation unit for calculating the number of rotations of the chuck section 18 (first clamping section). The control device 50 calculates the number of rotations of the chuck section 18 based on the unwound length Y and the twist pitch P.

[0102] According to this embodiment, the twisting device 1 includes a chuck portion 18 that clamps the untwisted portion yh of the twisted cable 2. The twisted cable 2 has a twisted portion ts where a pair of wires 2a and 2b are twisted together, and an untwisted portion yh where a pair of wires 2a and 2b are not twisted. Furthermore, the twisting device 1 includes a chuck portion 36 and a motor 12. The chuck portion 36 clamps the boundary portion of the twisted portion ts adjacent to the untwisted portion yh, and the motor 12 rotates the chuck portion 18 in the twisting direction to twist the untwisted portion yh, thereby making the untwisted portion yh continuous with the twisted portion ts.

[0103] By constructing the twisting device 1 as described above, it is possible to add twisting to the untwisted portion yh at the end of the stranded cable 2, thereby increasing the length of the twisted portion ts and improving the noise characteristics of the stranded cable 2.

[0104] Furthermore, the second clamping device 30 includes a moving unit 33, which is capable of moving the chuck portion 36 toward the chuck portion 18 as the chuck portion 18 rotates. By doing so, winding can be performed at an appropriate pitch. When back tension is applied to the winding portion ts, a compressed pitch is easily formed, so even if rotation is performed using the calculated number of rotations Nr, the unwound length may become longer than standard. In this embodiment, since the second clamping device 30 includes the moving unit 33, and the movement of the moving unit 33 is controlled so that no back tension is applied, winding can be performed at an appropriate pitch.

[0105] Furthermore, since the chuck section 18 clamps a pair of wires 2a and 2b together, there is no need to provide a separate clamping section, and adjustments such as the clamping position of the wires can be easily made.

[0106] Furthermore, a control device 50 is provided to calculate the number of rotations of the chuck section 18 driven by the motor 12. The control device 50 calculates this number of rotations based on the unwound length Y and the length P of each twist pitch. In this way, the number of rotations of the chuck section 18 can be determined based on known information.

[0107] This invention is not limited to the embodiments described above. That is, those skilled in the art can implement various modifications based on known techniques without departing from the spirit of this invention. It should be understood that any modifications that include the construction of the twisting device of this invention also fall within the scope of this invention.

Claims

1. A twisting device, comprising: A first clamping part clamps the unstretched portion of a stranded cable, the stranded cable including a stranded portion and an unstretched portion; In the twisted section, a pair of wires are twisted together, while in the untwisted section, the pair of wires are not twisted together. A second clamping part clamps the boundary portion of the twisted part adjacent to the untwisted part; as well as A rotary drive unit that rotates the first clamping portion in a direction such that the untwisted portion extends from the twisted portion.

2. The twisting device according to claim 1, comprising: The moving unit is capable of moving the second clamping part closer to the first clamping part as the first clamping part rotates.

3. The twisting device according to claim 1, wherein, The first clamping part clamps the pair of wires simultaneously.

4. The twisting device according to claim 1, wherein, The rotary drive unit includes a calculation unit for calculating the number of rotations of the first clamping part, and The calculation unit calculates the number of times based on the length of the untwisted portion and the length of each twist pitch.

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