JP3881163B2 - Wire joint detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric wire joint detecting device provided in an electric wire traveling route to a cutting / crimping machine or the like.
[0002]
[Prior art]
For example, in the production of a wire harness, there is a process of drawing an electric wire from an electric wire supply, cutting the electric wire to a required length, and attaching terminals to both ends thereof by crimping, pressure welding, or the like. An example of a machine for attaching the terminal is a cutting / crimping machine, and an electric wire joint detection device is provided in the electric wire traveling path from the electric wire supply to the cutting / crimping machine. This is to detect and remove the position of the wire joint so that it does not become part of the product.
[0003]
Conventionally, the detection of the wire joint is generally performed by twisting the wire joint with the conductor exposed, and as shown in FIG. 6, a voltage is applied to the opposing pair of untwisting rollers 1 in the traveling path of the wire a. When the joint is exposed (1a, 1b in the figure) and the joint where the conductor is exposed comes between the rollers 1a, 1b, the joints are detected by conducting both the rollers 1a, 1b through the joint.
[0004]
Further, when the electric wire is connected with a tape or the like, the connection is detected by a color sensor or the like.
[0005]
[Problems to be solved by the invention]
In the joint detection by the electrical continuity, a detection error may occur due to poor contact between the electric wire a and the rollers 1a and 1b. Further, it cannot be detected at a joint where the conductor is not exposed.
[0006]
The detection by the color sensor does not require the exposure of the conductor, but the sensor is expensive and the detection adjustment is difficult, and erroneous detection is often performed.
[0007]
It is an object of the present invention to reliably detect a joint regardless of the presence or absence of conductor exposure at the joint of the electric wire.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned problem, the present invention firstly pays attention to the fact that there is a certain level of difference in the connection between the electric wire joints regardless of which connection means is employed, and the joint is detected based on the level difference. . For example, if the joint is formed by peeling the sheath of the wire end and twisting the exposed conductor, there is a step due to the bulging of the twisted portion, or a step from the conductor portion to the sheath covering portion. Even in the case of sleeve crimping and welding, a level difference occurs in the sleeve and the weld pile.
[0009]
Next, according to the present invention, the detector is rotated by the convex joint step that travels, and the switch is operated by the rotation to detect the joint. If the detector is caught on the step, the detector rotates as the joint travels. By this action, the switch is operated and detected.
[0010]
As the switch, a well-known switch such as a micro switch or a photoelectric switch can be appropriately selected. For example, in the case of a micro switch, the presence or absence of the detector based on the rotation of the detector causes the detection of the detector in the photoelectric switch. The joint of each electric wire is detected by the change in the amount of received light based on the rotation.
[0011]
As the shape of the detector, a shape in which the distance between the sliding contact point with the electric wire and the rotation center is changed by rotation, for example, a polygonal plate such as a quadrangle and a triangle, and the center of the polygonal plate is used as the rotation axis. To do. At this time, the sliding contact surface of the detector with the electric wire can be detected even with a small level difference if the contact point is increased as a V-shaped groove surface (see FIG. 5), and the accuracy is improved.
[0012]
As a specific configuration of the present invention, an operating plate is provided on the apparatus frame so as to be swingable, and a switch that is operated by swinging of the operating plate is provided, and a detector that is in sliding contact with a traveling electric wire is rotated on the operating plate. The detector can be freely mounted, and the detector can be rotated by the step of the joint of the electric wire, and the operation plate can be swung by the rotation to operate the switch, and the joint of the electric wire can be detected by the operation signal.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 and FIG. 2 show an embodiment, and this embodiment is provided in an electric wire traveling route to an electric wire processing machine such as a cutting / crimping machine. An operating plate 11 is provided on the frame F so as to be swingable, and a micro switch 12 is provided thereon. For this reason, if the operation plate 11 swings upward as indicated by an arrow, the microswitch 12 is operated by pushing up the actuator 12a.
[0014]
An electric wire sliding jig 13 and a guide 14 are provided on the frame F below the operating plate 11, and the electric wire a travels through the electric wire sliding jig 13 and the guide 14. A square-shaped detector 15 is rotatably provided at the center of the end of the working plate 11 facing the wire sliding jig 13, and one side (lower edge) of the detector 15 is always wire-sliding. It is in sliding contact with the electric wire a running on the moving jig 13. This sliding contact force is given by the weight of the operating plate 11 and the downward biasing force of the actuator 12.
[0015]
For this reason, in the state in which the electric wire a is running, as shown in FIG. 2A, the operation plate 11 does not swing upward and the microswitch 12 does not operate.
[0016]
Next, when the joint by the winding of the tape b reaches the wire sliding jig 13, the detector 15 rotates with its corner hitting the step of the tape winding b as shown in FIGS. 2 (a) to 2 (b). To do. This rotation causes the operating plate 11 to swing upward and the micro switch 12 to operate. The electric wire joint b is detected by this operation signal, and the fact is transmitted to the electric wire processing machine.
[0017]
The next side of the rotated detector 15 slides on the electric wire a (joint b), whereby the operating plate 11 swings downward to return to the normal state, and enters the detection state of the next joint b. The above operation is repeated, and the joint b of the electric wire a is sequentially detected.
[0018]
3 and 4 show an embodiment in which a photoelectric switch 22 is employed instead of the microswitch 12, and in this embodiment, a spring 23 is interposed between the operation plate 11 and the wire sliding jig 13, and this The urging force of the spring 23 ensures that the detector 15 is in sliding contact with the electric wire a. The photoelectric switch 22 has a light receiving portion 22a and a light emitting portion 22b attached to the operation plate 11 with the detector 15 interposed therebetween.
[0019]
For this reason, when the electric wire a is running, as shown in FIG. 4A, the operating plate 11 does not swing upward, and the light between the light receiving / emitting portions 22a and 22b of the photoelectric switch 22 is detected. It is not blocked by the child 15. In this state, when the joint between the windings of the tape b reaches the electric wire sliding jig 13, the detector 15 rotates and light is received by the detector 15 as shown by chain lines in FIGS. The light between the light emitting portions 22a and 22b is blocked as shown by the oblique lines in FIG. 4B, and the photoelectric switch 22 is activated by the change in the amount of received light, and the wire joint b is detected.
[0020]
In this detection operation, even if the diameter of the electric wire a is changed, the light receiving / light emitting portions 22a and 22b of the photoelectric switch 22 and the rotating shaft 15a of the detector 15 are integrally displaced so that the relative position does not change. The accuracy of detecting the rotation of the child 15, that is, the joint detection accuracy is not affected. Therefore, in this embodiment, it is not necessary to adjust the operation of the photoelectric switch 22 even if the wire diameter changes.
[0021]
In the said embodiment, as shown in FIG.1 (b) and FIG.3 (b), since the detector 15 and the electric wire a are 1 point contacts, if a level | step difference does not pass through the contact point, it will not be detected, In some cases, it may not be detected when. On the other hand, as shown in FIG. 5, if the slidable contact surface is a V-shaped groove 15a, the slidable contact is made at two places, and the detection accuracy is improved.
[0022]
Further, the operating plate 11 (detector 15) and the jig 13 are electrically insulated by using the frame F as an insulating plate such as a bakelite plate, and a voltage is applied between the both 11 and 13 to Detection of joints by twisting conductors may also be performed. That is, the joint can electrically connect the detector 15 and the jig 13 so that the joint can be detected by the conduction.
[0023]
In the above embodiment, the joint is detected by the tape winding b. However, even in the above-described known joints such as conductor twisting and sleeve crimping, if there is a step, the joint can be detected. It is.
[0024]
【The invention's effect】
According to the present invention, since the joint is detected by the step as described above, the joint can be reliably detected without being restricted by the conductor exposure or the like.
[Brief description of the drawings]
1A is a perspective view of one embodiment, FIG. 1B is a front view of the detection unit, FIG. 2 is an operation diagram of the embodiment, and FIG. 3A is a perspective view of another embodiment; FIGS. 4A and 4B are front views of the detection unit. FIG. 4 is an operational view of the embodiment. FIG. 5A is a perspective view of the main part of another embodiment. FIG. Fig. 6 Plan view of conventional example [Explanation of symbols]
a Electric wire b Tape winding (joint)
11 Actuating plate 12 Micro switch 12a Micro switch actuator 13 Wire sliding jig 14 Wire guide 15 Detector 15a V-shaped groove 22 Photoelectric switch 22a Photoelectric switch light receiving unit 22b Photoelectric switch light emitting unit 23 Coil spring

Claims (4)

The detector (15) is slidably contacted with the traveling electric wire (a), and the detector (15) is rotated by the convex step of the joint (b) of the electric wire (a). , 22) to detect the joint (b) of the electric wire (a). In the apparatus frame (F), an operating plate (11) is provided so as to be swingable, and a switch (12) that is operated by swinging of the operating plate (11) is provided. A detector (15) slidably in contact with a) is rotatably mounted. The detector (15) is rotated by the convex step of the joint (b) of the electric wire (a), and the operation plate (11) is rotated by this rotation. The wire joint detecting device according to claim 1, wherein the switch (12) is actuated to detect the joint (b) of the wire (a) based on the actuation signal.   The detection switch is a photoelectric switch (22), and the joint (b) of the electric wire (a) is detected by the change in the amount of received light based on the rotation of the detector (15) of the photoelectric switch (22). The electric wire joint detection device according to claim 1, wherein   The electric wire according to any one of claims 1 to 3, wherein the slidable contact surface of the detector (15) with the electric wire (a) is a V-shaped groove (15a) into which the electric wire (a) is fitted. Joint detection device.

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