Extra twist device

Abstract

To provide a twist-increasing apparatus capable of increasing a twisted part of the end part of twisted wires by twisting an untwisted part.SOLUTION: A twist-increasing apparatus 1 includes: a chuck part 18 for griping an untwisted part yh of a twisted wire 2 having a twisted part ts where a pare of electric wires 2a, 2b are twisted, and an untwisted part yh where a pair of electric wires 2a, 2b are not twisted. Further, the twist-increasing device includes: a chuck part 36 for griping a boundary of the twisted part ys with the untwisted part yh; and a motor 12 for rotating the chuck part 18 in a direction of twisting the untwisted part yh so as to be continuous with the twisted part ts.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an additional twisting device that twists together untwisted portions at the ends of a twisted wire in which a pair of electric wires are twisted together. [Background technology]

[0002] Conventionally, various twisted wire manufacturing devices have been proposed for producing a twisted wire by twisting two electric wires together. For example, Patent Document 1 describes the following twisted wire manufacturing device. The twisted wire manufacturing device described in Patent Document 1 includes a first intermittent rotor having a clamp for fixing one end of a pair of electric wires on three circumferential faces, a second intermittent rotor having a clamp for fixing the other end of the pair of electric wires and a motor for rotating the clamp in the circumferential direction on three circumferential faces, and a drive means for intermittently rotating the first and second intermittent rotors by 1 / 3 revolutions each. The three faces are composed of an electric wire setting surface, an electric wire twisting surface, and a twisted wire tape winding and paying-out surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-28197 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, twisted wires manufactured by the manufacturing apparatus described in Patent Document 1 have untwisted portions at both ends. If the length of the untwisted portions is too long, the noise characteristics of the twisted wire are degraded.

[0005] In the manufacturing device described in Patent Document 1, a rotor is provided between a first intermittent rotor and a second intermittent rotor, and the electric wires are twisted by a twist rod of the rotor. Therefore, the length of the untwisting section is required to be the length of the rotor, and it is difficult to shorten the untwisting section in the manufacturing device described in Patent Document 1.

[0006] In view of the above problems, the present invention has an object to provide an additional twisting device that can increase the twisted portion at the end of a twisted wire by twisting the untwisting portion. [Means for solving the problem]

[0007] The invention made to solve the above-mentioned problems is an additional twisting device comprising: a first gripping portion for gripping the untwisting portion of a twisted wire, the untwisting portion having a twisted portion in which a pair of electric wires are twisted together and an untwisting portion in which the pair of electric wires are not twisted together; a second gripping portion for gripping the boundary portion of the twisted portion with the untwisting portion; and a rotation drive unit for rotating the first gripping portion in a direction to twist the untwisting portion so that it is continuous with the twisted portion. Effect of the Invention

[0008] According to the present invention, the untwisted portion at the end of the twisted wire can be twisted more, thereby improving the noise characteristics of the twisted wire. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an additional twisting device according to an embodiment of the present invention. [Diagram 2] 2 is a perspective view of the additional twisting device shown in FIG. 1 from a different angle. FIG. [Diagram 3] FIG. 2 is a perspective view of the additional twisting device shown in FIG. 1 with a chuck portion in an open state. [Figure 4] 2 is a perspective view of a chuck portion of a first gripping device shown in FIG. 1. [Diagram 5]2 is a front view of a chuck portion of the first gripping device shown in FIG. 1. [Figure 6] 2 is a perspective view of a chuck portion of the second gripping device shown in FIG. 1. [Figure 7] 2 is a front view of a chuck portion of the second gripping device shown in FIG. 1. [Figure 8] 2 is a flowchart of an additional twisting operation of the additional twisting device shown in FIG. 1. [Figure 9] FIG. 2 is a diagram showing the state before additional twisting. [Figure 10] FIG. 13 is a diagram showing the state after additional twisting. [Figure 11] FIG. 13 is an explanatory diagram for calculating the wire length for one pitch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described below with reference to the drawings. Figures 1 to 3 are perspective views of an additional twisting device according to an embodiment of the present invention. Figures 1 and 2 are views showing a state in which a chuck portion, which will be described later, is closed, and Figure 3 is a view showing a state in which the chuck portion is open.

[0011] First, the twisted wire 2, which is increased in twisting by the additional twisting device 1 according to this embodiment, will be described. As shown in Fig. 3 and Fig. 9 described later, the twisted wire 2 before processing by the additional twisting device 1 is composed of a portion (twisted portion ts) where the electric wires 2a and 2b are twisted and a portion (untwisted portion yh) where the electric wires 2a and 2b are not twisted. The untwisted portion yh is connected to the twisted portion ts and is formed at the end of the twisted wire 2. In this embodiment, additional twisting refers to twisting the untwisted portion yh to make the length of the untwisted portion yh shorter than before processing.

[0012] The additional twisting device 1 shown in Figure 1 etc. comprises a first gripping device 10 that grips the untwisted portion yh of the twisted wire 2, which will be described later, a second gripping device 30 that grips the boundary portion between the untwisted portion yh and the twisted portion ts, which will be described later, of the twisted wire 2, and a control device 50.

[0013] The first gripping device 10 includes a bracket 11, a motor 12, a driving pulley 13, a driven pulley 14, an endless belt 15, a support 16, a slide portion 17, and a chuck portion 18.

[0014] The bracket 11 fixes the motor 12 described above, and also fixes a drive pulley 13 and a driven pulley 14 so as to be freely rotatable.

[0015] The motor 12 is fixed to the bracket 11 and rotates the drive pulley 13. An endless belt 15 is stretched between the drive pulley 13 and the driven pulley 14. Therefore, when the drive pulley 13 rotates, the driven pulley 14 also rotates by the endless belt 15. When the driven pulley 14 rotates, the chuck portion 18 also rotates, as described below. In other words, the motor 12 functions as a rotation drive portion that rotates the chuck portion 18 (first gripping portion) in the twisting direction so that the untwisting portion yh is continuous with the twisted portion ts.

[0016] A support 16 is attached to the driven pulley 14. The support 16 rotates in conjunction with the rotation of the driven pulley 14. A slide portion 17 is provided at the tip of the support 16. The slide portion 17 is formed in a flat rectangular parallelepiped shape, and a groove is formed on the surface opposite to the surface that is joined to the support 16. The gripping members 19 and 20 of the chuck portion 18 are engaged with the groove, and the gripping members 19 and 20 can be slid in the direction of approaching and retracting from each other (moving closer and further away). The gripping members 19 and 20 slide with the slide portion 17, thereby opening and closing the chuck portion 18. The opening and closing of the chuck portion 18 is controlled by a control device 50.

[0017] As described above, the chuck portion 18 is equipped with the gripping members 19 and 20. The gripping members 19 and 20 are shown in Fig. 4 and Fig. 5. Fig. 4 is a perspective view of the gripping members 19 and 20, and Fig. 5 is a front view of the gripping members 19 and 20.

[0018] The gripping member 19 includes a front portion 19a, a rear portion 19b, an electric wire gripping member 19c, and a rib 19d. The front portion 19a is formed with a surface 19a1 constituting the front surface of the chuck portion 18 (the side facing the second gripping device 30) and a surface 19a2 formed on the back side of the surface 19a1 (the side in contact with the electric wire gripping member 19c). The surface 19a1 is formed in a substantially W-shape, and the surface 19a2 is formed in a substantially M-shape. Therefore, the apex portions of the W shape and the M shape of the front portion 19a alternately protrude toward the gripping member 20.

[0019] Similar to the front portion 19a, the rear portion 19b also has a surface formed in a substantially W-shape and a surface formed in a substantially M-shape. The rear portion 19b is disposed with a gap between it and the front portion 19a.

[0020] The electric wire gripping member 19c is provided so as to be sandwiched between the front part 19a and the rear part 19b. In this embodiment, the electric wire gripping member 19c is made of urethane and is formed into a substantially rectangular parallelepiped shape. This allows the force to be applied evenly to both electric wires, and prevents a situation in which the force is applied to the first one of the pair of electric wires gripped due to an error in the electric wire diameter or the like, causing the grip of the other one to become loose.

[0021] The rib 19d fits into a groove in the slide portion 17 to allow the grip member 19 to slide in the extension direction of the slide portion 17.

[0022] The gripping member 20 has the same configuration as the gripping member 19. The gripping member 20 includes a front portion 20a, a rear portion 20b, an electric wire gripping member 20c, and a rib 20d. The front portion 20a is formed with a surface 20a1 constituting the front surface of the chuck portion 18 (the side facing the second gripping device 30) and a surface 20a2 formed on the back side of the surface 20a1 (the side in contact with the electric wire gripping member 20c). The surface 20a1 is formed in a substantially W-shape, and the surface 20a2 is formed in a substantially M-shape. Therefore, the front portion 19a protrudes toward the gripping member 19 with the vertices of the W and the M alternately.

[0023] Similar to the front portion 20a, the rear portion 20b also has a surface formed in a substantially W-shape and a surface formed in a substantially M-shape. The rear portion 20b is disposed with a gap between it and the front portion 20a.

[0024] The electric wire gripping member 20c is provided so as to be sandwiched between the front portion 20a and the rear portion 20b. The electric wire gripping member 20c is made of urethane and has a substantially rectangular parallelepiped shape, similar to the electric wire gripping member 19c.

[0025] The rib 20d fits into the slide portion 17 to allow the gripping member 19 to slide freely in the extension direction of the slide portion 17.

[0026] The chuck portion 18 positions the electric wires 2a, 2b in the two W-shaped valley portions 20a3 of the front portion 20a of the gripping member 20, and grips the electric wires 2a, 2b with the electric wire gripping members 19c, 20c by interlocking the W-shaped portion and the M-shaped portion of the gripping members 19 and 20 with each other.

[0027] As is clear from the above description, the chuck portion 18 functions as a first gripping portion that grips the untwisted portion yh of the twisted wire 2. In addition, the chuck portion 18 grips the pair of electric wires 2a, 2b simultaneously (collectively).

[0028] As shown in FIGS. 1 to 3, the second holding device 30 includes a base 31, a rail 32, a moving portion 33, a support , a slide portion 35, and a chuck portion .

[0029] The base 31 is formed in a flat plate shape. The base 31 is provided with rails 32. A pair of rails 32 are provided extending on the base 31 so that the moving part 33 is movable in a direction toward and away from the first holding device 10.

[0030] As described above, the moving part 33 is movable on the rail 32. A support 34 is erected on the moving part 33. A slide part 35 is provided at the upper end of the support 34. The slide part 35 is formed in a flat rectangular parallelepiped shape, and a groove is formed on the surface opposite to the surface that is joined to the support 16. The gripping members 37 and 38 of the chuck part 36 are engaged with the groove, and the gripping members 37 and 38 can be slid in the direction of approaching and separating from each other. The gripping members 37 and 38 slide with the slide part 35, so that the chuck part 36 opens and closes. The opening and closing of the chuck part 36 is controlled by a control device 50.

[0031] As described above, the chuck portion 36 is equipped with the gripping members 37 and 38. The gripping members 37 and 38 are shown in Fig. 6 and Fig. 7. Fig. 6 is a perspective view of the gripping members 37 and 38, and Fig. 7 is a front view of the gripping members 37 and 38.

[0032] The gripping member 37 includes a comb-shaped portion 37a and a rib 37b. The comb-shaped portion 37a has a plurality of teeth arranged in the extension direction of the twisted wire 2, and each tooth has a V-shaped groove formed therein. The comb-shaped portion 37a positions the twisted wire 2 in the V-shaped groove.

[0033] The rib 37b fits into a groove in the slide portion 35 to allow the gripping member 37 to slide in the extending direction of the slide portion 35.

[0034] The gripping member 38 has a similar configuration to the gripping member 37. The gripping member 38 includes a comb-shaped portion 38a and ribs 38b. The comb-shaped portion 38a has a plurality of teeth arranged in the extension direction of the twisted wire 2, and each tooth has a V-shaped groove formed therein. The comb-shaped portion 38a positions the twisted wire 2 in the V-shaped groove.

[0035] The comb portions of the comb-shaped portion 37a of the gripping member 37 and the comb portions of the comb-shaped portion 38a of the gripping member 38 are alternately meshed with each other to grip the twisted wire 2.

[0036] The rib 38b fits into a groove in the slide portion 35 to allow the gripping member 38 to slide in the extension direction of the slide portion 35.

[0037] As is clear from the above description, the chuck portion 36 functions as a second gripping portion that grips the boundary portion of the twisted portion ts with the untwisted portion yh. In addition, the moving portion 33 is movable so as to move the chuck portion 36 (second gripping portion) closer to the chuck portion 18 (first gripping portion).

[0038] The control device 50 is configured with, for example, a control device equipped with a microcomputer, etc. The control device 50 controls the opening and closing of the chucks 18, 36. The control device 50 also calculates the number of rotations (number of additional twists) of the chuck 18 based on the length of the untwisted portion yh of the set twisted wire 2, etc., and rotates the motor 12 by the calculated number of rotations.

[0039] Next, the additional twisting operation in the additional twisting device 1 having the above-mentioned configuration will be described with reference to the flow chart of FIG.

[0040] First, the twisted wire 2 is set (step S1). The control device 50 opens the chuck units 18, 36. Then, the tip of the untwisting portion yh of the twisted wire 2 to be additionally twisted is set in the chuck unit 18, and the twisted portion ts is set in the chuck unit 36. Here, when setting in the chuck unit 36, it is preferable to position the boundary portion (also called the untwisting intersection) between the twisted portion ts and the untwisting portion yh at the forefront of the comb-shaped portions 37a, 38a (the side facing the first holding device 10). Note that an imaging unit may be provided above the additional twisting device 1, and the untwisting intersection may be detected based on an image captured by the imaging unit.

[0041] In addition, step S1 may be set manually, but may also be set by automatic conveyance using a conveying device or the like from another position of the manufacturing device of the twisted wire 2. During automatic conveyance, it is preferable to apply back tension to the twisted wire 2.

[0042] Next, the electric wire is chucked (step S2). The control device 50 closes the chuck portions 18, 36 to grip the untwisted portion yh and the twisted portion ts. After the twisted portion ts is gripped by the chuck portion 36, no back tension is applied to it.

[0043] Next, the control device 50 calculates the number of rotations of the chuck portion 18 (step S3). The calculation of the number of rotations will be described in detail later. This number of rotations is the number of times that the chuck portion 18 is rotated to perform additional twisting at the same twist pitch as the twisted portion ts.

[0044] Next, the control device 50 operates the motor 12 to rotate the chuck portion 18 by the number of rotations calculated in step S3 (step S4). Then, the electric wires 2a, 2b between the chuck portion 18 and the chuck portion 36 are twisted (additionally twisted) by the rotation of the chuck portion 18. At this time, the chuck portion 36 moves closer to the chuck portion 18 in response to the twist. That is, the chuck portion 36 is pulled by the twisting force, and the moving portion 33 moves on the rail 32 in the direction of the arrow in FIG. 1. That is, the moving portion 33 is movable so as to move the chuck portion 36 (second gripping portion) closer to the chuck portion 18 (first gripping portion) as the chuck portion 18 (first gripping portion) rotates.

[0045] Then, the chuck of the electric wire is released (step S5). The control device 50 opens the chuck portions 18 and 36. Then, the twisted wire 2 that has been additionally twisted is moved to the next process, such as terminal crimping. Note that the movement to the next process may be performed manually or automatically, similar to step S1.

[0046] Here, the method of calculating the number of rotations described in step S3 will be described with reference to Fig. 9 to Fig. 11. Fig. 9 and Fig. 10 show the electric wires 2a, 2b (twisted wire 2) held by the chucks 18, 36 of the additional twisting device 1. Fig. 9 shows the state before additional twisting, and Fig. 10 shows the state after additional twisting.

[0047] Here, A is the gripping position of the chuck portion 18, and indicates the distance from the tip of the electric wires 2a, 2b to the front portions 19a, 20a. F indicates the distance from the tip of the electric wires 2a, 2b to the single wire chuck. The single wire chuck is a device that chucks the electric wire when it is moved by, for example, an automatic conveying device, and is the distance A plus the distance required to grip the electric wires 2a, 2b before and after the additional twisting operation. A and F are values ​​that are known in advance from the configuration of the device. If a single wire chuck is not used, F may be considered as F=A.

[0048] G is the pitch between the electric wires in the chuck portion 18. G is a value that is known in advance based on the configuration of the chuck portion 18. P (see FIG. 10) is the length per pitch of twisting (twisting pitch). In this embodiment, this P is the central value of a predetermined tolerance. Y (see FIG. 10) is the length of the untwisting portion yh (untwisting length). Y is a fixed value determined by a standard. L (see FIG. 9) is the distance from the chuck portion 18 to the chuck portion 36. L is also a value that is known in advance based on the configuration of the additional twisting device 1.

[0049] The above values ​​are used as input values ​​to calculate the following values: First, the wire length La (see FIG. 9) from the chuck part 18 to the chuck part 36 is calculated. La is calculated by the following formula (1).

number

[0050] Next, calculate the total wire length Lb (see FIG. 9) of the untwisted portion, including the portion held by the chuck portion 18. Lb is calculated by the following formula (2).

number

[0051] Next, the length Yt (see FIG. 10) of the untwisted portion yh after additional twisting based on the above input values ​​is calculated. Yt is calculated by the following formula (3).

number

[0052] Next, calculate the wire length Pt for one pitch based on the above input values. Pt is calculated using the following formula (4). In formula (4), d is the outer diameter of the wire. Here, the calculation of the wire length for one pitch will be explained with reference to FIG. 11. The left side of FIG. 11 shows one pitch of twisted wire 2. At this time, the center of the wire when twisted is wound around a cylinder of radius d / 2 (center of FIG. 11). If the cylinder in this state is unfolded, the wound part becomes a diagonal line (right side of FIG. 11). Therefore, calculating the length of that diagonal line will give the wire length for one pitch.

number

[0053] Next, the length Lt of the wire to be twisted is calculated using the following formula (5).

number

[0054] Next, the number of twists Nt' is calculated using the following formula (6).

number

[0055] Next, Nt' calculated by formula (6) is converted to an integer. The number of twists converted to an integer is set to Nt. This conversion to an integer is performed, for example, by rounding off to the first decimal place. The reason for this conversion to an integer is that the minimum unit of rotation of the chuck portion 18 is one rotation.

[0056] Next, the untwist length Ys is calculated from the integer number of twists. This untwist length Ys is calculated using the following formula (7).

number

[0057] Next, the number of twists is recalculated using the untwist length Ys calculated by equation (7). That is, Ys is used instead of Yt in equation (5), and the result is substituted into (6). The number of twists Nt' calculated by equation (6) is then converted into an integer to calculate the number of twists Nts. Here, in relation to the untwist length Ys calculated by equation (7) and the input value of the untwist length Y, if Ys>Y, then Nts=Nt'+1, and if Ys≦Y, then Nts=Nt' is set to calculate the number of twists Nts.

[0058] Then, the calculated number of twists Nts is added with 1 to obtain a value which is set as the number of rotations Nr of the chuck portion 18.

[0059] In this way, the control device 50 functions as a calculation unit that calculates the number of times to rotate the chuck portion 18 (first gripping portion). The control device 50 calculates the number of times to rotate the chuck portion 18 based on the untwisting length Y and the twisting pitch P.

[0060] According to this embodiment, the additional twisting device 1 includes a chuck unit 18 that grips the untwisted portion yh of the twisted wire 2, which has a twisted portion ts where the pair of electric wires 2a, 2b are twisted together, and an untwisted portion yh where the pair of electric wires 2a, 2b are not twisted together. The device further includes a chuck unit 36 ​​that grips the boundary portion of the twisted portion ts with the untwisted portion yh, and a motor 12 that rotates the chuck unit 18 in a direction to twist the untwisted portion yh so that it is continuous with the twisted portion ts.

[0061] By configuring the additional twisting device 1 as described above, the untwisted portion yh at the end of the twisted wire 2 can be additionally twisted, thereby increasing the portion of the twisted portion ts and improving the noise characteristics of the twisted wire 2.

[0062] In addition, the second gripping device 30 has a moving part 33 that can move the chuck part 36 closer to the chuck part 18 as the chuck part 18 rotates. In this way, twisting can be performed at an appropriate pitch. If back tension is applied to the twisted part ts, a narrow pitch is likely to be formed, so that even if the twisted part ts is rotated at the above calculated number of rotations Nr, the untwisted length may be longer than the standard. As in this embodiment, the second gripping device 30 has the moving part 33, and by controlling the movement of the moving part 33 so that back tension is not applied, twisting can be performed at an appropriate pitch.

[0063] Furthermore, since the chuck portion 18 grips the pair of electric wires 2a, 2b together, there is no need to provide separate gripping portions, and adjustment of the gripping positions of the electric wires, etc., is also easy.

[0064] Also, a control device 50 is provided that calculates the number of times the motor 12 rotates the chuck portion 18, and the control device 50 calculates the number of times based on the untwisting length Y and the length per pitch of the twisting P. In this way, the number of times the chuck portion 18 rotates can be found based on known information.

[0065] Furthermore, the present invention is not limited to the above-mentioned embodiment. In other words, a person skilled in the art can implement the present invention by modifying it in various ways according to the conventionally known knowledge without departing from the gist of the present invention. As long as the configuration of the additional twisting device of the present invention is still included in the scope of the present invention even after such modification, it is of course included in the scope of the present invention. [Explanation of symbols]

[0066] 1. Extra twist device 2 Twisted Wires 10 First gripping device 12 Motor (rotation drive unit) 18 Chuck part (first gripping part) 30 Second gripping device 32 Rail 33 Mobile Division 36 Chuck part (second gripping part) 50 Control device (calculation unit) ts Twisted section yh Untwisting section

Claims

1. a first gripping portion for gripping an untwisted portion of a twisted wire, the untwisted portion including a twisted portion in which a pair of electric wires are twisted together and an untwisted portion in which the pair of electric wires are not twisted together; A second gripping portion that grips a boundary portion of the twisted portion with the untwisted portion; A rotation drive unit that rotates the first gripping unit in a direction in which the untwisting unit is twisted so as to be continuous with the twisted unit; An additional twisting device comprising:

2. 2. The additional twisting device according to claim 1, further comprising a moving part that is movable so as to move the second gripping part closer to the first gripping part as the first gripping part rotates.

3. The additional twisting device according to claim 1 , wherein the first gripping portion simultaneously grips the pair of electric wires.

4. A calculation unit that calculates the number of times that the rotation drive unit rotates the first grip unit, The calculation unit calculates the number of times based on a length of the untwisting portion and a length per pitch of twisting.

2. The twisting device according to claim 1 .

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