JPH0574119U - Electric wire terminal processing condition inspection device - Google Patents

Abstract

(57) [Abstract] [Purpose] Inspecting the spread of the bare core wire portion 10 in the wire end 2 to prevent the occurrence of defective products due to the protruding wire from the terminal crimping part. Provide a device. [Structure] The bare core wire portion 10 is provided on the transfer path of the electric wire terminal 2.
The optical fiber sensors 12a, 12b, 12c are provided to provide passage signals of lengths corresponding to the passage time of the base end portion 10a and the tip end portion 10b. A processing circuit is provided for comparing the lengths of the base end passage signal and the tip end passage signal, determining that the core wire state is defective when the difference is greater than a predetermined value, and determining the core wire state when the difference is less than the predetermined value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric wire end treatment state inspection device for inspecting the state of a core wire portion of an electric wire end in which a core wire portion is exposed by performing a coating stripping process.

[0002]

[Prior Art]

 There is an automatic terminal crimping device that is configured to continuously and automatically perform a terminal crimping process including a process of stripping the coating of the wire end and a process of crimping the terminal to the stripped portion. An uncovered stripping condition inspection device is placed on the processing path of the automatic terminal crimping device (wire terminal transfer path) to inspect whether or not the wire stripping process has been successfully performed, and it is determined that the stripping failure has occurred. The occurrence of defective products was prevented in advance.

[0003]

[Problems to be solved by the device]

 However, even when the coating stripping treatment is performed on the wire end securely, the bare core part of the coating stripping treatment may come into contact with other members during the coating stripping treatment or transfer. There is a case where the tip end side is widened due to the occurrence of disparity due to such factors.

When the terminals are crimped in the terminal crimping process with the bare core wire being in a loose state, a part of the wires forming the core wire may protrude from the crimping part of the terminal. There was a risk that the quality of the product would deteriorate.

Therefore, in view of the above problems, the present invention detects the spread of the bare core wire portion to prevent the occurrence of defective products due to the sticking out of the wires, thereby improving the quality of the product. An object is to provide a processing state inspection device.

[0006]

[Means for Solving the Problems]

 The technical means for achieving the above object is an electric wire end treatment condition inspection device for inspecting the condition of the core wire portion of the electric wire end exposed by the stripping treatment before the terminal crimping process. It is placed on the transfer path of the terminal and detects the non-contact detection of the passing of the residual coating part side base end part and the other end side tip part of the bare core wire part of the wire end, and the length corresponding to the passing time. Of the first and second passing signals, respectively, and the lengths of the first and second passing signals are compared, and when the difference is larger than a predetermined value, the core wire state is defective. And a determination unit that determines that the core wire state is good when the value is equal to or less than a predetermined value.

[0007]

[Action]

 According to the present invention, the core wire portion of the wire end barely exposed by the coating stripping process is detected by the first and second detecting means on the transfer path, and the bare coating core side group of the bare core wire portion is detected. First and second passing signals having a length corresponding to the passing time of the end portion and the tip portion on the other end side are derived.

At this time, when the tip side of the bare core wire portion is not widened, the difference in length between the first and second passing signals is small, and conversely, the tip side of the bare core wire portion is widened. If so, the difference between the lengths of the first and second passing signals becomes large.

Then, the judging means compares the lengths of the first and second passing signals, judges that the core wire state is defective when the difference is larger than a predetermined value, and judges that the core wire state is good when the difference is less than the predetermined value. Set.

Here, an electric wire having a defective core wire state can be detected, and a defective product can be prevented from occurring.

[0011]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 is a sensor support block, which is arranged at a predetermined position of an automatic terminal crimping device and is used for transferring an electric wire terminal 2. It is formed in a U-shape when viewed from the side, with an electric wire passage 3 corresponding to the path.

On the other hand, the electric wire terminal 2 that has been subjected to the coating stripping process has its root gripped by the pair of transfer claws 5a and 5b, and as shown in FIG. 1 and FIG. Is transferred from the right side (upstream) to the left side (downstream) as indicated by the arrow. For example, in the case of the above-mentioned automatic terminal crimping apparatus, the coating stripping processing section exists on the upstream side and the terminal crimping processing section exists on the downstream side in the figure.

Each of the support arms 7a and 7b, which vertically oppose each other across the wire passage 3 of the sensor support block 1, has a residual coating portion 9 of the wire terminal 2 transferred along the transfer path and a bare core wire portion. The transmission type optical fiber sensors 12a, 12b, 12c corresponding to the passage positions of the residual coating portion 9 side proximal end portion 10a and the other end side distal end portion 10b of 10 are provided, respectively. It constitutes first, second and third detection means.

Each of the optical fiber sensors 12a, 12b, 12c is an optical fiber connected to a photoelectric switch 13a, 13b, 13c composed of a pair of a light emitter and a light receiver, and a detection head portion of each photoelectric switch 13a, 13b, 13c. 14a, 14b, and 14c, and the optical fibers 14a, 14b, and 14c of each pair are arranged so as to face each other with the optical axes aligned with each other with the electric wire passage 3 interposed therebetween. Since the optical axes coincide with each other, the lights 16a, 16b, 16c emitted from the projectors of the photoelectric switches 13a, 13b, 13c are always guided to the receiver side through the pair of optical fibers 14a, 14b, 14c. However, as shown in FIG. 3, when the residual coating portion 9 and the bare core wire portion 10 shield this light 16a, 16b, 16c, the photodetectors of the photoelectric switches 13a, 13b, 13c generate detection signals. Since these detection signals continue while the lights 16a, 16b, 16c are shielded, their lengths are the time taken for the residual coating portion 9 and the proximal end portion 10a and the distal end portion 10b of the bare core wire portion 10 to pass, respectively. It corresponds to.

The detection signals derived from the respective optical fiber sensors 12a, 12b, 12c in this way are the residual coating portion passing signal, the base end portion passing signal of the bare core wire portion 10 and the tip end passing signal, respectively. Is provided to the processing circuit described later, and is used to judge whether the coating is peeled off or not and whether the core wire is in good condition or not.

FIG. 6 is a schematic block diagram showing such a processing circuit, and the waveform of each part thereof is shown in the waveform diagram of FIG. The processing circuit includes a clock generator 18 for generating the clock pulse shown in FIG. 7A, a residual covered portion passing signal from each of the optical fiber sensors 12a, 12b, 12c, and a base end portion of the bare core wire portion 10. AND gates 19a, 19b and 19c for ANDing the pass signal and the tip pass signal with the clock, and counters 20a, 20b and 20c for counting the outputs of the AND gates 19a, 19b and 19c, respectively. It is composed of counters 20a, 20b forming a pair, and comparison operation circuits 21a, 21b for comparing the output count values of the counters 20b, 20c, respectively, and determines the quality of stripping and the quality of the core wire. It functions as a judgment means.

First, to describe the operation in the case where the stripping of the coating is good, in this case, the residual coating portion passing signal derived from the optical fiber sensor 12a is as shown in FIG. The base end passing signal of the bare core wire portion 10 derived from the sensor 12b is as shown by the solid line in FIG. 7 (D). The time width of the passing signal corresponds to the width of the residual coating portion 9 and the base end portion 10a of the bare core wire portion 10 shown in FIG.

The AND gate 19a receives the clock signal of FIG. 7 (A) and the residual cover portion passing signal of FIG. 7 (B), performs an AND process, and outputs a signal shown in FIG. 7 (C). Further, the AND gate 19b receives the clock signal of FIG. 7A and the base end passing signal of the solid line of FIG. 7D, performs AND processing, and outputs the signal shown by the solid line of FIG. 7E. The number of pulses included in the output signals of the AND gates 19a and 19b is proportional to the time width of each passing signal.

The numbers of these pulses are respectively counted by the counters 20a and 20b, and the count values are given to the comparison operation circuit 21a. The comparison operation circuit 21a compares the two count values and determines whether the difference is larger than a predetermined value. When the difference is larger than the predetermined value, there is a sufficient difference in the lateral width between the residual coating portion 9 and the bare core wire portion 10, and it can be seen that the coating was peeled off satisfactorily. Therefore, in this case, the comparison calculation circuit 21a outputs a determination signal indicating that the peeling is good. On the other hand, when the difference is less than the predetermined value, there is no sufficient difference in the lateral width between the residual coating portion 9 and the bare core wire portion 10, and it can be seen that the stripping is not performed well. Therefore, in this case, the comparison calculation circuit 21a outputs the determination signal indicating the peeling failure. For example, if zero is most easily selected as the above-mentioned predetermined value, the quality of peeling will be determined by whether or not both count values are equal. Of course, an appropriate predetermined value may be preset according to the shape of the electric wire.

Assuming that zero is selected as the predetermined value, the numbers of output pulses of the AND gates 19a and 19b shown by the solid lines in FIGS. 7C and 7E are 16 and 8, respectively. Therefore, the comparison operation circuit 21a determines that 16-8> 0, that is, 16> 8, and outputs a determination signal indicating good stripping.

Next, a case where the coating stripping is defective will be described. In this case, the core wire portion 10 to be exposed barely remains covered, and the signal passing through the base end portion of the bare core wire portion 10 derived from the optical fiber sensor 12b is the two-dot chain line in FIG. As shown in FIG. 7, the time width is similar to that of the residual coating portion passing signal in FIG. 7 (B). Therefore, as shown by the two-dot chain line in FIG. 7 (E), the number of output pulses (= 16) of the AND gate 19b becomes equal to the number of output pulses (= 16) of the AND gate 19a shown in FIG. 7 (C). Then, the comparison operation circuit 21a determines that 16-16 = 0, that is, 16 = 16, and outputs a determination signal indicating a peeling defect.

Further, to describe the operation when the bare core wire portion 10 is in a good core state, in this case, the signal passing through the base end portion of the bare core wire portion 10 derived from the optical fiber sensor 12b is as shown in FIG. ) As shown by the solid line, the signal passing through the tip of the bare core wire portion 10 derived from the optical fiber sensor 12c is as shown in FIG. 7 (F). The time width of both passing signals corresponds to the lateral width of the base end portion 10a and the tip end portion 10b of the bare core wire portion 10 shown in FIG.

The AND gate 19b receives the clock signal of FIG. 7A and the signal passing through the base end portion of the solid line of FIG. 7D, performs an AND process, and outputs the signal shown by the solid line of FIG. 7E. Further, the AND gate 19c receives the clock signal of FIG. 7A and the leading edge passing signal of FIG. 7F, performs an AND process, and outputs a signal shown in FIG. 7G. The number of pulses included in the output signals of the AND gates 19b and 19c is proportional to the time width of each passing signal.

The numbers of these pulses are respectively counted by the counters 20b and 20c, and the count value is given to the comparison operation circuit 21b. The comparison calculation circuit 21b compares the two count values and determines whether the difference is larger than a predetermined value. When the difference is less than the predetermined value, there is not a sufficient difference in the lateral width between the base end portion 10a and the tip end portion 10b of the bare core wire portion 10, and the bare core wire portion 10 does not spread due to variation. It can be seen that the core wire condition is good. Therefore, in this case, the comparison calculation circuit 21b outputs a determination signal indicating that the core state is good. On the other hand, when the difference is larger than the predetermined value, there is a sufficient difference in the lateral width between the base end portion 10a and the tip end portion 10b, and the bare core wire portion 10 has a spread due to variation, and the core wire state It can be seen that is defective. Therefore, in this case, the comparison calculation circuit 21b outputs a determination signal indicating a core wire state defect. For example, if 2 is selected as the above-mentioned predetermined value, the quality of the core wire state is determined depending on whether both count values are larger or smaller than 2. Of course, an appropriate predetermined value may be preset depending on the shape of the electric wire.

Assuming that 2 is selected as the predetermined value, the number of output pulses of the AND gates 19b and 19c shown in the solid line of FIG. 7E and FIG. The arithmetic circuit 21b determines that 8-8 = 0.ltoreq.2 and outputs a determination signal indicating good core condition.

Next, as shown in FIG. 4, a case where the bare core wire portion 10 is in a discontinuous state and the core wire state is defective will be described. In this case, since the spread on the base end portion 10a side is restricted by the residual coating portion 9, the base end portion passing signal derived from the optical fiber sensor 12b is the same as described above as shown by the solid line in FIG. 7 (D). On the other hand, since the front end portion 10b is widened, the front end portion passing signal derived from the optical fiber sensor 12c has a wide time width as shown in FIG. 7 (H). Therefore, the difference between the output pulse number (= 8) of the AND gate 19b shown by the solid line in FIG. 7 (E) and the output pulse number (= 14) of the AND gate 19c shown in FIG. 7 (I) becomes large. Here, the comparison operation circuit 21b determines that 14-8 = 6> 2, and outputs a determination signal indicating a defective core state.

Note that, as shown in FIG. 5, when a part of the bare core wire portion 10 is expanded, the tip end passing signal derived from the optical fiber sensor 12c is as shown in FIG. 7 (J). However, the time width is short because only part of the spread is detected. Therefore, the difference between the output pulse number (= 8) of the AND gate 19b shown by the solid line in FIG. 7E and the output pulse number (= 1) of the AND gate 19c shown in FIG. The arithmetic circuit 21b determines that 8-1 = 7> 2, and outputs a determination signal indicating a defective core state.

The determination signal indicating the quality of the stripping and the determination signal indicating the quality of the core wire obtained as described above are used for performing predetermined control. For example, in response to a judgment signal indicating a defect such as a stripping defect or a core wire condition defect, the operation of the automatic terminal crimping device is stopped in an emergency to allow the defective wire to be manually removed, and an alarm is activated. It may be activated to notify the operator of a defective state such as peeling failure or core wire state failure. Further, for example, it is possible to configure the automatic terminal crimping device so that the defective electric wire is automatically selected and removed in response to the judgment signal indicating any one of the defective peeling and the defective core state.

FIG. 8 and FIG. 9 are schematic block diagrams showing another embodiment of the processing circuit as the judging means. These processing circuits convert the width of each of the residual coating portion 9 and the bare core wire portion 10 into a digital value (the number of pulses) in the processing circuit of FIG. 6, whereas these widths are integrated circuits 23a, 23b, 23c to convert into an analog value (voltage value).

In the embodiment of FIG. 8, the integrating circuits 23a, 23b and 23c receive the passing signals of the optical fiber sensors 12a, 12b and 12c from FIGS. 7B, 7D and 7F respectively and integrate them. Then, it is converted into a voltage value of a magnitude corresponding to the time width of each passing signal. These voltage values are given to the voltage comparators 24a and 24b. One of the voltage comparators 24a compares these voltage values, outputs a judgment signal indicating good peeling when the difference is larger than a predetermined value, and outputs a judgment signal indicating defective peeling when the difference is less than the predetermined value. The other voltage comparator 24b compares these voltage values, and outputs a determination signal indicating that the core wire condition is good when the difference is less than or equal to a predetermined value, and when the difference is greater than the predetermined value, the core wire condition is not good. Is output. This comparison is similar to the comparison in the comparison operation circuits 21a and 21b described above, and the description thereof is omitted.

The embodiment of FIG. 9 is similar to the embodiment of FIG. 8, but the output voltage values of the integrating circuits 23a, 23b, 23c are converted into digital values via the A / D converters 25a, 25b, 25c, respectively. It differs from the embodiment of FIG. 8 in that these are compared after conversion. The output digital values of the A / D converters 25a, 25b, 25c are the time widths of the passing signals from the optical fiber sensors 12a, 12b, 12c shown in FIGS. 7 (B), (D), and (F), respectively. Correspondingly, the comparison operation circuits 26a and 26b perform the same comparison operation as described above with respect to these digital values, and output a determination signal indicating whether the coating stripping is good or the core wire state is good.

In each of the above-described embodiments, three sets of optical fiber sensors 12a, 12b, 12c are used to detect the quality of stripping of the wire end 2 and the quality of the core wire state at the same passing position. The entire device can be made compact.

However, even if the detection device for determining the quality of stripping and the detection device for determining the quality of the core wire have different structures and are arranged in sequence along the transfer path of the wire terminal 2. Good.

Further, in each of the above-mentioned embodiments, the structure using the transmission type optical fiber sensors 12a, 12b, 12c as the detecting means for deriving the passing signal is shown. Any detection means capable of detecting the passage of the core wire 10 in a non-contact manner and outputting a passage signal of a length corresponding to the passage time, for example, a reflection type photoelectric switch may be used.

[0035]

[Effect of the device]

 As described above, according to the wire end treatment condition inspection device of the present invention, the wire end is disposed on the transfer path of the wire end, and the bare end of the wire end is covered with the residual coating portion on the base end side and the other end side. First and second detection means for respectively detecting the passage of the tip end without contact and providing first and second passage signals of lengths corresponding to the passage time, and the first and second detectors. The length of the passing signal is compared, and if the difference is larger than a predetermined value, it is judged that the core wire state is defective, and if it is less than the predetermined value, it is judged that the core wire state is good. It is possible to detect in advance the defective core wire in which the core wire has spread, and it is possible to prevent the occurrence of defective products due to the wires protruding from the terminal crimping part, which can improve the quality of the product.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a schematic side view illustrating the same.

FIG. 4 is a plan view of an electric wire terminal in a defective core wire state.

FIG. 5 is a plan view of an electric wire terminal with a poor core wire state.

FIG. 6 is a schematic block diagram showing a processing circuit.

7 is a waveform diagram of each part in FIG.

FIG. 8 is a schematic block diagram showing another embodiment of the processing circuit.

FIG. 9 is a schematic block diagram showing another embodiment of the processing circuit.

[Explanation of symbols]

 2 wire end 9 residual coating part 10 bare core wire part 10a base end part 10b tip part 12a, 12b, 12c optical fiber sensor 18 clock generator 19a, 19b, 19c AND gate 20a, 20b, 20c counter 21a, 20b comparative operation circuit

Claims (1)

[Scope of utility model registration request] 1. An end treatment state inspection device for an electric wire, which inspects a state of a core wire portion of an electric wire end exposed by a stripping process before a terminal crimping process, which is arranged on a transfer route of the electric wire end. The non-contact detection of the passage of the residual coating portion side proximal end portion and the other end side distal end portion of the bare core wire portion of the wire end, and the first and second passages of lengths corresponding to the passage time. The lengths of the first and second passing signals are compared with the first and second detecting means for giving a signal, respectively, and when the difference is larger than a predetermined value, it is determined that the core wire state is defective, and the core wire state is below the predetermined value. An electric wire end treatment state inspection device, comprising: a determining unit that determines that the core wire state is good.