JP2532025Y2 - Inspection equipment for wire termination - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire terminal processing state inspection apparatus for inspecting the state of a core part of an electric wire end in which a core part is exposed by performing a coating stripping process.

[0002]

2. Description of the Related Art There is an automatic terminal crimping apparatus configured to continuously and automatically perform a terminal crimping process including a process of stripping a covering of a wire terminal and a process of crimping a terminal to the stripped portion. is there. Then, an insulation stripping state inspection device is arranged on the processing route of the automatic terminal crimping device (transfer route of the wire terminal), and inspects whether or not the wire stripping process has been performed well. Product generation was prevented beforehand.

[0003]

However, even if the stripping process of the wire end has been performed reliably, the core portion exposed in the stripping process may not be removed during the stripping process. In some cases, contact may occur with other members at the time of transfer, so that the leading end may be widened.

[0004] When the terminals are crimped in the terminal crimping process in a state where the bare core wires are disjointed, a part of the wires constituting the core wires may protrude from the crimp portions of the terminals. There was a possibility that the quality of the product was lowered.

[0005] In view of the above problems, the present invention detects the spread of the bare core wire portion, prevents the occurrence of defective products due to the protruding wires, and improves the quality of the products. It is an object to provide an inspection device.

[0006]

Technical means for attaining the above object include a terminal treatment of an electric wire for inspecting a state of a core portion of an end of the electric wire exposed by a coating stripping process before a terminal crimping process. A condition inspection device, wherein a transfer path of a wire terminal is provided.
Across the while being opposed, detects the passage of the residual coating portion side base end portion of the bare core wire portion of the wire end and the other end tip without contact each length corresponding to the time of the passage Comparing the lengths of the first and second passing signals with the first and second detecting means for providing the first and second passing signals, respectively. Determination means for determining that the core wire state is good when the value is equal to or less than a predetermined value , and wherein the first and second detection means
A photoelectric switch comprising a pair of a transmitter and a receiver,
Connected to the detection heads of the sender and receiver respectively.
Comprising an optical fiber sensor having
Connected to the emitter and receiver of each photoelectric switch
The other end of the pair of optical fibers has the optical axis
Are arranged so as to coincide with each other.

[0007]

According to the present invention, the core portion of the wire end stripped by the coating stripping process is detected by the first and second detecting means on the transfer path, and the residual coating of the stripped core portion is detected. First and second passing signals having lengths corresponding to the passing times of the part-side base end and the other end-side tip are derived.

At this time, if the leading end side of the bare core portion is not widened, the difference between the lengths of the first and second passing signals is small, and conversely, the leading end side of the bare core portion is widened. In this case, the difference between the lengths of the first and second passing signals is large.

The determining means compares the lengths of the first and second passing signals. If the difference is larger than a predetermined value, it is determined that the core wire state is poor. If the difference is smaller than the predetermined value, it is determined that the core wire state is good. I do.

Here, an electric wire having a defective core wire state can be detected,
Defective products can be prevented from occurring. In addition, the first
And the second detecting means are a pair of a projector and a receiver, respectively.
Photoelectric switch and the detection heads of the sender and receiver.
Optical fiber with an optical fiber
It consists of fiber sensor, and the light emitter and receiver of each photoelectric switch
The other end of each pair of optical fibers connected to the
Oppositely arranged so that the optical axis coincides across the transfer path
Light emitted from the projector
One of the transport paths is connected through the optical fiber connected to the projector.
Receiver that is guided to the other side and faces the transport path
Is received by the optical fiber of
Guided to the vessel. Therefore, it requires much installation space.
Optical fibers are placed opposite each other across the transport path,
Install relatively bulky emitters and receivers in empty space
Detection that is placed opposite the transfer path
Parts can be made more compact.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a sensor support block which is arranged at a predetermined position of an automatic terminal crimping apparatus. It is formed in a U-shape in a side view provided with an electric wire passage 3 corresponding to the second transfer path.

On the other hand, the wire terminal 2 having been subjected to the coating stripping process
Is transported from the right side (upstream) to the left side (downstream) as indicated by an arrow on the transfer path for processing, as shown in FIGS. 1 and 2, with the base gripped by the pair of transport claws 5a and 5b. Is done. For example, if the above-mentioned automatic terminal crimping device,
A coating stripping section is present on the upstream side in the figure, and a terminal crimping section is present on the downstream side.

Each of the support arms 7a and 7b vertically opposed to each other across the electric wire passage 3 of the sensor support block 1 has a residual covering portion 9 of the electric wire terminal 2 transferred along the transfer path.
Transmission-type optical fiber sensors 12a, 12b, and 12c are provided corresponding to the passing positions of the base end portion 10a and the other end portion 10b on the remaining covering portion 9 side of the bare cored wire portion 10, respectively. It constitutes first, second and third detecting means for detecting.

Each of the optical fiber sensors 12a, 12b, 12
c denotes a photoelectric switch 13a composed of a pair of a projector and a receiver.
13b, 13c and each of the photoelectric switches 13a, 13b, 1
The optical fibers 1 respectively connected to the detection heads 3c
4a, 14b, and 14c, and a pair of optical fibers 14a, 14b, and 14c are arranged to face each other across the electric wire passage 3 so that the optical axes coincide. Since the optical axes coincide, each of the photoelectric switches 13a, 13a,
Lights 16a, 16b, 1 emitted from the projectors 13b, 13c
6c is always guided to the light receiving side through the pair of optical fibers 14a, 14b, 14c, but as shown in FIG.
a, 16b and 16c are shielded from light,
The photodetectors a, 13b and 13c generate detection signals. Since these detection signals continue while the lights 16a, 16b, and 16c are shielded, their lengths are respectively set to the residual covering portion 9, the proximal end portion 10a and the distal end portion 10b of the bare cored wire portion 10.
It corresponds to the time of passing.

Thus, each optical fiber sensor 12
The detection signals derived from a, 12b, and 12c are given to a later-described processing circuit as a residual covering portion passing signal, a base portion passing signal and a leading end portion passing signal of the bare core wire portion 10, respectively. It is used for determining the quality of the core wire.

FIG. 6 is a schematic block diagram showing such a processing circuit, and the waveforms of the respective parts are shown in the waveform diagram of FIG.
The processing circuit includes a clock generator 18 for generating a clock pulse shown in FIG.
AND gates 19a, 1 which AND-process the residual covering portion passing signals from 12b, 12c, the base portion passing signal and the leading portion passing signal of the bare core wire portion 10 with the above clock, respectively.
9b, 19c and AND gates 19a, 19b, 19
counters 20a and 20 for respectively counting the outputs of c
b and 20c, and counters 20a and 20 that form a pair, respectively.
b and comparison operation circuits 21a and 21b for comparing the respective output count values of the counters 20b and 20c, respectively, and function as a judging means for judging the quality of the coating stripping and the quality of the core wire state.

First, the operation in the case where the coating stripping is good will be described. 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 12b is as shown by the solid line in FIG. Note that the time width of the passing signal corresponds to the width of the residual covering 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 shown in FIG. 7A and the signal passing through the residual covering portion shown in FIG. 7B, performs an AND process, and outputs a signal shown in FIG. 7C. The AND gate 19b receives the clock signal of FIG. 7A and the base-end passing signal of the solid line in FIG. 7D, performs an AND process, and outputs a signal indicated by the solid line in FIG. These AN
The number of pulses included in the output signals of the D gates 19a and 19b is proportional to the time width of each passing signal.

The number of these pulses is determined by the counters 20a, 20a.
b, and the count value is supplied 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 successfully stripped.
Therefore, in this case, a determination signal indicating good peeling is output from the comparison operation circuit 21a. On the other hand, when the difference is equal to or less than the predetermined value, there is no sufficient difference in the width between the residual coating portion 9 and the bare core wire portion 10, and it can be seen that the coating is not stripped well. Therefore, in this case, the comparison operation circuit 21a outputs a determination signal indicating a stripping failure. For example, if zero is most simply selected as the predetermined value, the quality of stripping is determined based on whether or not both count values are equal. Of course, an appropriate predetermined value may be set in advance according to the shape of the electric wire.

Now, assuming that zero is selected as the predetermined value, if A is indicated by a solid line in FIG. 7 (C) and FIG.
The number of output pulses of the ND gates 19a and 19b is 1
6 and 8, the comparison operation circuit 21a calculates 16-8
> 0, that is, 16> 8, and outputs a determination signal indicating good peeling.

Next, a case where the coating stripping is defective will be described. In this case, the core wire 10 to be exposed is still covered, and the signal passing through the proximal end of the exposed core wire 10 derived from the optical fiber sensor 12b is indicated by a two-dot chain line in FIG. As shown, the signal has a time width similar to that of the signal passing through the residual covering portion in FIG. 7B. Therefore, as shown by the two-dot chain line in FIG. 7E, the number of output pulses of the AND gate 19b (= 1)
6) becomes equal to the number of output pulses (= 16) of the AND gate 19a shown in FIG. 7C. Then, the comparison operation circuit 21a determines that 16−16 = 0, that is, 16 = 16, and outputs a determination signal indicating a peeling failure.

Further, the operation when the core state of the bare core section 10 is good will be described. In this case, the base end passing signal of the bare core section 10 derived from the optical fiber sensor 12b is shown in FIG. As shown by the solid line, the signal passing through the distal end of the bare core wire 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 width of the base end 10a and the tip end 10b of the bare core wire section 10 shown in FIG.

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

The number of these pulses is determined by the counters 20b and 20b.
c, and the count value is supplied to the comparison operation circuit 21b. The comparison operation circuit 21b compares the two count values and determines whether the difference is larger than a predetermined value. When the difference is equal to or less than the predetermined value, there is no sufficient difference in the width between the base end portion 10a and the distal end portion 10b of the bare cored wire portion 10, and the bare cored wire portion 10 does not spread due to looseness. It can be seen that the core condition is good. Therefore, in this case, the comparison operation circuit 21b outputs a determination signal indicating that the core wire state is good. On the other hand, when the difference is larger than the predetermined value, the proximal end 10a and the distal end 10b
There is a sufficient difference in the width between
It can be seen that the spread due to irregularities has occurred, and that the state of the core wire is defective. Therefore, in this case, the comparison operation circuit 21b outputs a determination signal indicating a core wire state defect. For example, if 2 is selected as the predetermined value, the quality of the core wire state is determined based on whether both count values are larger or smaller. Of course, depending on the shape of the wire,
An appropriate predetermined value may be set in advance.

Now, assuming that a predetermined value of 2 is selected, the solid line in FIG. 7E and the AN shown in FIG.
Since the number of output pulses of each of the D gates 19b and 19c is 8, the comparison operation circuit 21b determines that 8−8 = 0 ≦ 2, and outputs a determination signal indicating that the core state is good.

Next, as shown in FIG.
A case where the core wire state where 0 is in a disjointed state is bad will be described. In this case, the proximal end 10a side is
7D, the signal passing through the base end portion derived from the optical fiber sensor 12b is the same as described above as shown by the solid line in FIG. 7D. The tip passage signal derived from the sensor 12c has a wide time width as shown in FIG. 7 (H). Therefore, the AND gate 19b shown by the solid line in FIG.
And the number of output pulses (= 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 core state defect.

Note that, as shown in FIG.
In a state where a part of 0 is widened, the leading end passage signal derived from the optical fiber sensor 12c detects only the widened part as shown in FIG. Become. Accordingly, the AND gate 19 shown by the solid line in FIG.
b, the number of output pulses (= 8) and AND shown in FIG.
The difference from the number of output pulses (= 1) of the gate 19c increases, and the comparison operation circuit 21b determines that 8-1 = 7> 2, and outputs a determination signal indicating a core line state defect.

The determination signal indicating the quality of the coating stripping obtained as described above and the determination signal indicating the quality of the core wire state are as follows:
It is used for performing predetermined control. For example, in response to a determination signal indicating either a peeling failure or a core wire state failure, the operation of the automatic terminal crimping apparatus is stopped emergencyly, and the defective wire can be manually removed, and the alarm is activated. The operator may be notified of the defective state of the peeling failure or the core wire state failure. Further, for example, an automatic terminal crimping apparatus can be configured so that a defective wire is automatically selected and removed in response to a determination signal indicating either a peeling failure or a core wire state failure.

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

In the embodiment of FIG. 8, the integrating circuits 23a,
23b, 23c are optical fiber sensors 12a, 12b, 1
7B, and receives and integrates the signals shown in FIGS. 7B, 7D, and 7F, and converts them into voltage values having magnitudes corresponding to the time widths of the respective passed signals. These voltage values are provided to voltage comparators 24a and 24b. One voltage comparator 24a compares these voltage values, and outputs a determination signal indicating good peeling when the difference is greater than a predetermined value, and outputs a determination signal indicating poor peeling when the difference is equal to or less than the predetermined value. The other voltage comparator 24b compares these voltage values, and outputs a determination signal indicating good core state when the difference is equal to or less than a predetermined value, and indicates a poor core state when the difference is larger than the predetermined value. Outputs a judgment signal. This comparison is performed by the comparison operation circuit 21 described above.
This is the same as the comparison in a and 21b, and the description is omitted.

The embodiment of FIG. 9 is similar to the embodiment of FIG. 8, except that the output voltage values of the integrating circuits 23a, 23b and 23c are converted into digital values through A / D converters 25a, 25b and 25c, respectively. 8 is different from the embodiment in FIG.
The output digital values of the A / D converters 25a, 25b, 25c correspond to the time widths of the respective passing signals from the optical fiber sensors 12a, 12b, 12c shown in FIGS. 7 (B), 7 (D), 7 (F). The comparison operation circuit 26a,
26b performs a comparison operation similar to that described above for these digital values, and outputs a determination signal indicating the quality of the coating stripping and the quality of the core wire state.

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

However, the detecting device for judging the quality of the stripping of the coating and the detecting device for judging the quality of the core wire may have a separate structure, and may be arranged sequentially along the transfer route of the wire terminal 2. .

Each of the optical fiber sensors 12a and 12a
b and 12c are light beams each composed of a pair of a projector and a receiver.
Electrical switches 13a, 13b, 13c,
Optical fiber connected to the detection head of the optical device
14a, 14b, and 14c.
Connected to 3a, 13b, 13c projector and receiver respectively
The other end of the pair of optical fibers 14a, 14b, 14c
Are opposed to each other so that the optical axis is aligned
Installation space.
Power the optical fibers 14a, 14b, 14c
Place the line passage 3 in opposition, and throw relatively
Optics and receivers can be installed in empty space,
Compensation of the detection part which is arranged oppositely across the line passage 3
Can be implemented.

[0035]

[Effects of the Invention] As described above, according to the wire terminal processing state inspection device of the present invention, the wire terminal transfer path is sandwiched.
While being disposed to face each other, the passage of the bare end portion of the bare core portion of the electric wire terminal at the base end portion and the end portion at the other end is detected in a non-contact manner, and the first and the lengths corresponding to the passing times are detected. First and second detecting means for respectively providing a second passing signal, and comparing the lengths of the first and second passing signals, and when the difference is larger than a predetermined value, it is determined that the core wire state is poor, Determining means for determining that the core wire state is good when the value is equal to or less than a predetermined value, wherein the first and second detecting means are each configured to perform a projection.
A photoelectric switch consisting of a pair of optical device and
Optical fiber connected to the detection head of the
Each optical switch consists of an optical fiber sensor
Pairs of optical filters respectively connected to the
The other end of Iva has the same optical axis across the transfer path
In this way, it is possible to detect in advance the wire with a poor core wire state in which the bare core wire portion has spread, and to prevent the occurrence of defective products due to the protruding of the wire from the terminal crimping portion. Product quality can be improved. Ma
Also, move optical fiber that requires little installation space.
A relatively bulky emitter that is placed opposite to the transmission path
And receiver can be installed in an empty space.
The detection parts that are placed opposite each other across the road
There is also an advantage that it can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of 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 end in a state where a core wire state is poor.

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

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

FIG. 7 is a waveform chart of each part in FIG. 6;

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 Electric wire end 9 Residual coating 10 Bare core wire 10a Base end 10b Tip 12a, 12b, 12c Optical fiber sensor 18 Clock generator 19a, 19b, 19c AND gate 20a, 20b, 20c Counter 21a, 20b Comparison operation circuit

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-198850 (JP, A) JP-A-59-123413 (JP, A) JP-A-61-154412 (JP, A) JP-A-58-1988 95911 (JP, A) JP-A-60-203865 (JP, A) JP-A 2-91411 (JP, U) JP-A 63-167245 (JP, U) JP-A 43-1088 (JP, Y1) Special table 1983-500455 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A wire terminal processing state inspection device for inspecting a state of a core portion of a wire terminal exposed by a coating stripping process before a terminal crimping process, wherein a wire terminal transfer path is sandwiched. While being opposed ,
The non-contact detection of the passage of the bare end portion of the bare wire core portion of the electric wire terminal at the base end portion and the tip portion at the other end is performed in a non-contact manner, and the first and second passage signals having lengths corresponding to the passage times are detected. First and second detection means respectively provided are compared with the lengths of the first and second passing signals, and when the difference is larger than a predetermined value, it is determined that the core wire state is not good. Determining means for determining that the state is good ; wherein the first and second detecting means are each provided with a projector and a receiving means.
A photoelectric switch consisting of a pair of optical devices, and a sender and a receiver
The optical fiber connected to each of the detection heads
The optical fiber sensor is equipped with
Other than the pair of optical fibers respectively connected to the optical device and the receiver.
The ends are aligned so that the optical axis is aligned with the transfer path.
An electric wire terminal processing state inspection device characterized by being arranged in a direction .