JP3020015B2 - Inspection method of wire end treatment condition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire terminal for inspecting the processing condition of a wire terminal in which a waterproof tube is attached to a wire terminal and the core wire is exposed by coating stripping. The present invention relates to a processing state inspection method.

[0002]

2. Description of the Related Art A mounting process of inserting a waterproof tube made of rubber or the like into a wire end portion in a sleeve shape, a stripping process of stripping a coating of the wire end portion, and crimping a terminal to a portion where the coating is stripped. There is an automatic terminal crimping device that is configured to continuously and automatically perform the terminal crimping process including the crimping process step. After the terminal crimping process, the terminal crimping portion is covered with a waterproof tube so that water can be applied to the terminal crimping portion. It is configured to effectively prevent the intrusion of the information.

[0003] A sheath stripping state inspection device is arranged on a processing route (transfer route of an end portion of the electric wire) of the automatic terminal crimping device, and inspects whether or not the sheath stripping process of the electric wire has been properly performed. The occurrence of defective products due to defective picking was prevented beforehand.

[0004]

However, even if the wire end portion is securely stripped, if there is a mistake in mounting the waterproof tube, the waterproof tube is crimped after the terminal is crimped. There has been a problem that it cannot be mounted, which leads to the generation of defective products.

[0005] The present invention has been made in view of the above problems, the same
Using the inspection device, intended to be enabling inspection and stripping processing state of covering the attachment processing state of the waterproof tube, to provide a terminal portion processing state inspection method of an electric wire to prevent the occurrence of defective products from occurring And

[0006]

A technical means for achieving the above object is to attach a waterproof tube to an end of an electric wire and to perform a coating stripping process so as to expose a core portion of the electric wire. In the method for inspecting the processing condition of the terminal portion of the electric wire, which is disposed on the transfer path of the terminal portion of the electric wire, the passage of two positions separated by a predetermined distance in the longitudinal direction of the electric wire terminal portion is detected in a non-contact manner. And comparing the lengths of the first and second passing signals with first and second detecting means for respectively providing first and second passing signals having a length corresponding to the passing time, When the difference is larger than a predetermined value, the processing state is determined to be good, and when the difference is equal to or smaller than the predetermined value, the processing state is determined to be poor. 2 detection means The first and the covering portion and the waterproof tube attachment section
And the second pass signal are derived, and the length of the first and second pass signals is compared by the determination means, and the state of the waterproof tube mounting process is determined depending on whether the difference is greater than or less than a predetermined value. After the mounting process state inspection step to be inspected and the relative positional relationship between the wire terminal and the first and second detecting means are moved by a predetermined amount in the longitudinal direction of the wire terminal, the wire terminal is transferred. At this time, the first and second detecting means derive first and second passing signals of the covering portion of the electric wire terminal portion and the bare core wire portion, and the determining means detects the first and second passing signals of the first and second passing signals. The method comprises a stripping state inspection step of inspecting the stripping state of the coating according to whether the lengths are compared and the difference is larger or smaller than a predetermined value.

[0007]

According to the present invention, in the mounting processing state inspection step, when the wire terminal is transferred, the first and second detecting means detect the two positions of the covering portion of the wire terminal and the waterproof tube mounting portion. Is detected, and first and second passage signals having a length corresponding to the passage time of the covering portion and the waterproof tube mounting portion are derived.

[0008] At this time, when the waterproof tube is attached to the end of the electric wire, the difference between the lengths of the first and second passing signals is large, and conversely, when the waterproof tube is not attached. , There is almost no difference between the first and second passing signals.

The determination means compares the difference between the lengths of the first and second passing signals, and determines that the processing state is good when the difference is greater than a predetermined value, and determines that the processing state is bad when the difference is less than the predetermined value. judge. Here, the mounting error of the waterproof tube with respect to the wire terminal can be detected.

In the stripping state inspection step, the relative positional relationship between the wire end and the first and second detecting means is moved by a predetermined amount in the longitudinal direction of the wire end, and then the wire end is moved. If it is transported, the first and second detecting means detect two different positions from the above, that is, two positions of the covering portion of the electric wire terminal portion and the bare core portion, and the covering portion and the bare core portion are detected. The first and second passing signals having a length corresponding to the passing time are derived.

At this time, if the covering portion is peeled off satisfactorily, the difference between the lengths of the first and second passing signals is large, and conversely, if the covering portion is not peeled off, , There is almost no difference between the first and second passing signals.

The determining means compares the difference between the lengths of the first and second passing signals, and determines that the processing state is good when the difference is greater than a predetermined value, and determines that the processing state is bad when the difference is less than the predetermined value. judge. Here, the stripping mistake of the coating at the wire end can be detected.

[0013]

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 5, reference numeral 1 denotes a sensor support block which is disposed 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 transfer path of the section 2.

On the other hand, the wire end portion 2 which has been subjected to the waterproof tube 4 mounting process and the coating stripping process is connected to the pair of transport claws 5a, 5b.
As shown in FIGS. 1 to 3, the base is gripped and transferred from the right side (upstream) to the left side (downstream) as indicated by an arrow P on the transfer path for processing. For example, in the case of the above-mentioned automatic terminal crimping apparatus, a waterproof tube mounting section and a coating stripping section are sequentially present on the upstream side in the figure, and a terminal crimping section is present on the downstream side.

The transport claws 5a and 5b can be moved in the direction opposite to the arrow P, and can also be moved in the direction indicated by the arrow Q (longitudinal direction of the wire terminal portion 2) orthogonal to the arrow P and in the opposite direction. Is configured.

Each of the support arms 7a and 7b vertically facing each other across the wire passage 3 of the sensor support block 1 is separated by a predetermined distance L in the longitudinal direction of the wire terminal portion 2 transferred along the transfer path. A pair of transmissive optical sensors 9a and 9b are provided to detect the passage at two positions.
In the first transfer path shown in the solid line, FIG. 2 and FIG.
The non-contact detection of the passage between the two positions of the watertight tube 4 and the waterproof tube 4 is performed, and the second line shown in FIG.
In the transfer path, the sensors 9a and 9b constitute first and second detection means for non-contactly detecting passage of the covering portion 11 of the electric wire terminal portion 2 and the bare core wire portion 12 at two positions. I have.

Each of the light sensors 9a and 9b includes a light emitting element A1, B
1 and light-receiving elements A2 and B2, and each pair of light-emitting elements A1 and B1 and light-receiving elements A2 and B2 are disposed so as to correspond to each other so that the optical axes coincide with each other across the wire passage 3. I have. Since the optical axes coincide, each light emitting element A
The lights 14a and 14b emitted from the light-receiving elements A1 and B1 are always guided to the light receiving elements A2 and B2 in the pair, but as shown in FIGS. The covering portion 11 of the wire end portion 2 and the bare core wire portion 12
When the light receiving elements a and 14b are shielded from light, the respective light receiving elements A2 and B2 generate detection signals. Since these detection signals continue while the lights 14a and 14b are shielded, their lengths are
It corresponds to the time of passage of the waterproof tube 4 mounting portion, the covering portion 11 and the bare core wire portion 12.

The detection signals derived from each of the optical sensors 9a and 9b in this manner are given to a processing circuit described later as a tube mounting section passing signal, a covering section passing signal, and a bare core wire section passing signal, respectively, and are provided to a waterproof tube. It is used for determining the quality of the mounting process 4 and the quality of the coating stripping process.

FIG. 6 is a schematic block diagram showing such a processing circuit, and the waveforms of respective parts are shown in the waveform diagram of FIG.
The processing circuit includes a clock generator 16 that generates a clock pulse shown in FIG. 7A and an AN that performs an AND process on a passing signal from each of the optical sensors 9a and 9b with the clock.
D gates 17a, 17b and AND gates 17a, 1
Counters 18a, 1 which respectively count the outputs of 7b
8b and a comparison operation circuit 19 for comparing the respective output count values of both counters 18a and 18b, respectively, as a judging means for judging the quality of the waterproof tube 4 mounting process and the coating stripping process. Function. An inspection device is constituted by the optical sensors 9a and 9b and these processing circuits.

First, the operation when the waterproof tube 4 is attached to the wire end portion 2 in the attaching state inspection step will be described.
As shown in FIG. 7, when the electric wire terminal 2 is transferred in the direction of arrow P along the first transfer path, the covering portion passing signal derived from the optical sensor 9a becomes as shown in FIG. FIG. 7 shows the tube mounting section passing signal derived from FIG.
(D) As shown by the solid line. Figure 2 shows the time width of both passing signals.
Corresponds to the width of the covering portion 11 and the waterproof tube 4 mounting portion shown in FIG.

The AND gate 17a receives the clock signal of FIG. 7A and the covering portion passing signal of FIG.
D processing and outputs a signal shown in FIG. Also AN
The D gate 17b is connected to the clock signal of FIG.
(D) In response to the signal passing through the tube mounting part indicated by the solid line, AND
And outputs the signal shown in FIG. These AN
The number of pulses included in the output signals of the D gates 17a and 17b is proportional to the time width of each passing signal.

These pulse numbers are counted by counters 18a, 18
b, and the count value is given to the comparison operation circuit 19. The comparison operation circuit 19 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 covering portion 11 and the waterproof tube 4 mounting portion, and it can be seen that the waterproof tube 4 was successfully mounted. Therefore, in this case, the comparison operation circuit 19
Outputs a determination signal indicating that the mounting processing state is good. On the other hand, when the difference is equal to or less than the predetermined value, there is no sufficient difference in the lateral width between the covering portion 11 and the waterproof tube 4 mounting portion, and it can be seen that the waterproof tube 4 is not properly mounted. Therefore, in this case, the comparison operation circuit 19 outputs a determination signal indicating the mounting processing state 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, A shown by the solid line in FIG. 7C and FIG.
The number of output pulses of the ND gates 17a and 17b is 1
2 and 20, the comparison operation circuit 19 obtains 20-1
It determines that 2> 0, that is, 20> 12, and outputs a determination signal indicating that the mounting processing state is good.

Next, a case where the waterproof tube 4 is not mounted on the electric wire terminal portion 2 will be described. In this case, since the waterproof tube 4 is not mounted at the position where the waterproof tube 4 is to be mounted, the tube mounting portion passing signal derived from the optical sensor 9b is, as shown by the two-dot chain line in FIG.
The time width is the same as that of the residual covering portion passing signal in FIG. Therefore, the AND gate 17b in FIG.
Is equal to the number of output pulses (= 12) of the AND gate 17a shown in FIG. 7C. Then, the comparison operation circuit 19 obtains 12−12 = 0, ie, 12 = 1.
2 and outputs a determination signal indicating the mounting processing state failure.

As described above, when the mounting state checking step for checking whether or not the waterproof tube 4 is mounted is completed, the electric wire terminal portion 2 is returned once together with the transport claws 5a and 5b in the direction opposite to the arrow P. Move a predetermined amount in the direction of arrow Q,
As shown in the imaginary line in FIG. 1, and in FIGS. 3 and 5, the wafer is transferred again in the direction of arrow P along the second transfer path, and the stripping processing state inspection step is performed.

Next, in the stripping processing state inspection step, the operation in the case where the coating stripping is good will be described. When the wire terminal 2 is transferred in the direction of arrow P along the second transfer path,
The covering portion passing signal derived from the optical sensor 9a is shown in FIG.
As shown in FIG. 7 (F), the bare core wire passing signal derived from the optical sensor 9b is as shown by the solid line in FIG. 7 (H). The time width of both passing signals corresponds to the width of the covering portion 11 and the bare core portion 12 shown in FIG.

The AND gate 17a receives the clock signal of FIG. 7A and the covering portion passing signal of FIG.
D processing and outputs a signal shown in FIG. Also AN
The D gate 17b is connected to the clock signal of FIG.
(H) An AND process is performed in response to the solid bare core line portion passing signal and the signal shown in the solid line in FIG. 7 (I) is output. These AN
The number of pulses included in the output signals of the D gates 17a and 17b is proportional to the time width of each passing signal.

These pulse numbers are counted by counters 18a, 18
b, and the count value is given to the comparison operation circuit 19. The comparison operation circuit 19 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 width between the covering portion 11 and the bare core wire portion 12,
It can be seen that the coating was successfully removed. Therefore, in this case, the comparison operation circuit 19 outputs a determination signal indicating that the stripping processing state is good. On the other hand, when the difference is equal to or smaller than the predetermined value, there is no sufficient difference in the width between the covering portion 11 and the bare core wire portion 12, and it can be seen that the coating is not stripped well. Accordingly, in this case, the comparison operation circuit 19 outputs a determination signal indicating the stripping process state defect. For example, if the above-mentioned predetermined value is most simply selected as zero as described above,
The quality of stripping is determined based on whether the two count values are equal. Of course, an appropriate predetermined value may be set in advance according to the shape of the electric wire, or a value different from the predetermined value in the mounting processing state inspection step may be adopted.

Now, assuming that zero is selected as the predetermined value, if A is shown by a solid line in FIGS. 7 (G) and 7 (I).
The number of output pulses of the ND gates 17a and 17b is 1
2 and 6, the comparison operation circuit 19 obtains 12-6>
0, that is, 12> 6, and outputs a determination signal indicating that the stripping processing state is good.

Next, a case in which coating stripping is defective will be described. In this case, the core portion 12 to be exposed is still covered, and the bare core portion passing signal derived from the optical sensor 9b is, as shown by the two-dot chain line in FIG.
The time width is the same as that of the covering portion passing signal in (F).
Therefore, as shown by the two-dot chain line in FIG. 7 (I), the number of output pulses (= 12) of the AND gate 17b is equal to the number of output pulses (= 12) of the AND gate 17a shown in FIG. 7 (G). Then, the comparison operation circuit 19 determines that 12−12 = 0, that is, 12 = 12, and outputs a determination signal indicating a peeling processing state defect.

The waterproof tube 4 obtained as described above
The determination signal indicating the quality of the mounting process and the determination signal indicating the quality of the coating stripping process are used for performing predetermined control. For example, in response to a determination signal indicating either a failure in the mounting processing state or a failure in the stripping processing state, the operation of the automatic terminal crimping device is emergency stopped to enable the defective wire to be manually removed and the alarm device to be activated. It may be operated to notify the operator of the improper state of the mounting error of the waterproof tube 4 or the coating stripping error. Further, for example, it is also possible to configure an automatic terminal crimping device such that a defective wire is automatically selected and removed in response to a determination signal indicating either a failure in the mounting process state or a failure in the stripping process state. .

As described above, it is possible to detect in advance the electric wire in which the waterproof tube 4 is erroneously attached or the sheath is stripped, and to prevent the occurrence of defective products. In addition, since this method detects the passage of the waterproof tube mounting portion, the covering portion 11 and the bare core wire portion 12 of the electric wire terminal portion 2 in a non-contact manner, the same inspection device uses the same condition as the mounting process of the waterproof tube 4 and the stripping of the covering. It can also be used for inspection with the processing state, so that the structure can be simplified and the entire apparatus can be made compact.

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 waterproof tube 4 mounting portion, the covering portion 11, and the bare core wire portion 12 into digital values (number of pulses), whereas the processing circuits in FIG. 6 integrate these widths. It converts the analog value (voltage value) through the circuits 21a and 21b.

In the embodiment shown in FIG. 8, the integrating circuits 21a,
Reference numeral 21b receives and integrates the passing signals shown in FIGS. 7B and 7D or FIGS. 7F and 7H from the optical sensors 9a and 9b and converts them into voltage values having magnitudes corresponding to the passing signals. I do. These voltage values are provided to the voltage comparator 22.
The voltage comparator 22 compares these voltage values. If the difference is larger than a predetermined value, the voltage comparator 22 outputs a determination signal indicating that the mounting processing state is good or the stripping processing state is good. A determination signal indicating a failure or a peeling processing state failure is output. This comparison is performed by the comparison operation circuit 19 described above.
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 integration circuits 21a and 21b are converted into digital values through A / D converters 23a and 23b and then converted to digital values. It differs from the embodiment of FIG. 8 in that it is for comparison. A / D converter 23
The output digital values of a and 23b are shown in FIGS.
Alternatively, the optical sensors 9a and 9b shown in FIGS.
And the comparison operation circuit 24 performs the same comparison operation as described above for these digital values, and outputs a determination signal indicating the quality of the mounting process and the quality of the stripping process. I do.

In the above embodiment, the method of performing the mounting state inspection step first and then performing the stripping state inspection step is described. However, the stripping state inspection step is performed first, and then the mounting processing state is checked. A method of performing a state inspection step may be used. Also, a method of continuously performing the mounting processing state inspection step and the stripping processing state inspection step is shown. After passing through the waterproof tube mounting processing section, the mounting processing state inspection step is performed, and then the coating stripping processing section is performed. After that, a method of performing a stripping state inspection step may be used. In this case, if the mounting error of the waterproof tube 4 can be detected, it can be removed before the coating stripping process, and the work efficiency can be improved.

Further, in the above-described embodiment, the method of moving the wire end portion 2 in the longitudinal direction to change the relative positional relationship between the sensors 9a and 9b and the detection position of the wire end portion 2 is shown. The sensor support block 1 may be moved in the direction of the arrow Q or in the opposite direction to change the relative positional relationship between the sensors 9a and 9b and the wire end portion 2.

Further, in each of the above embodiments, the transmission type optical sensor 9a,
Although the structure using 9b is shown, the passage of the waterproof tube 4 mounting portion, the covering portion 11, and the bare core wire portion 12 is detected in a non-contact manner, and a passage signal having a length corresponding to the passage time is output. Any type of detection means may be used, for example, a reflective photoelectric switch.

[0039]

As described above, according to the method for inspecting the state of the wire end treatment of the present invention, when the wire end is transported, the first and second detecting means make the covering portion of the wire end waterproof. Deriving first and second passing signals with the tube mounting part,
An attaching process state inspecting step of comparing the lengths of the first and second passing signals by the judging means and inspecting the attaching process state of the waterproof tube according to whether the difference is greater than or less than a predetermined value; After moving the relative positional relationship between the terminal part and the first and second detecting means in the longitudinal direction of the wire terminal part by a predetermined amount, when transferring the wire terminal part, the first and second detecting means are used. To derive first and second passing signals between the covering portion of the electric wire terminal portion and the bare core wire portion, compare the lengths of the first and second passing signals by the determination means, and determine a difference between the first and second passing signals. Since it consists of a stripping state inspection step of inspecting the stripping state of the coating depending on whether the value is greater than the predetermined value or less than the predetermined value, it is possible to detect in advance the mounting error of the waterproof tube and the coating stripping error with respect to the wire end part, and to detect the defective product. Generation can be prevented beforehand, and Since a method for detecting passage of the waterproof tube attachment portion and the cover portion and the bare core wire portion in a non-mounted processing state inspection process and stripping process state detected a single inspection device
It can be used for both the inspection process and the dual use of the device. So
By using this inspection device, the mounting process status can be inspected.
Independent dedicated for the process and stripping condition inspection process
Compared to a structure equipped with an inspection device,
The advantage is that the pace and inspection equipment cost can be reduced.
You. In addition, the waterproof tube mounting part and the covering part at the wire end
Detects the passage of the bare core wire in a non-contact manner and adjusts the length of the passage signal.
The state of the waterproof tube mounting process and the coating stripping process
Because this is a method for determining
Image processing to capture the image
Therefore, there is an advantage that the processing speed for determination can be improved.

[Brief description of the drawings]

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

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

FIG. 3 is a schematic plan view of the same.

FIG. 4 is a schematic side view of FIG. 2;

FIG. 5 is a schematic side view of FIG. 3;

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 terminal 4 Waterproof tube 9a, 9b Optical sensor 11 Cover 12 Bare core wire 16 Clock generator 17a, 17b AND gate 18a, 18b Counter 19 Comparison operation circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 1/14 H01R 43/00 H01R 43/048

Claims (1)

(57) [Claims] 1. A method of inspecting a terminal state of a wire in which a waterproof tube is attached to an end of the electric wire and a processing of the end of the electric wire in which a core portion is exposed by coating stripping is performed. It is arranged on the transfer route of the wire terminal portion, detects the passage of two positions separated by a predetermined distance in the longitudinal direction of the wire terminal portion, respectively, in a non-contact manner, and detects the first and second lengths corresponding to the time of the passage. And comparing the first and second detection means respectively providing the second pass signal with the lengths of the first and second pass signals. If the difference is larger than a predetermined value, it is determined that the processing state is good. An inspection device having a determination means for determining a processing state failure when the value is equal to or less than a value, wherein when the wire terminal is transferred, the first and second detection means cover the wire terminal and the waterproof tube mounting part. First and second passing signals with Is derived, and the length of the first and second passing signals is compared by the determination means, and the state of the mounting process of the waterproof tube is inspected according to whether the difference is larger or smaller than a predetermined value. After moving the relative positional relationship between the wire end portion and the first and second detection means in the longitudinal direction of the wire end portion by a predetermined amount, when transferring the wire end portion, The second detecting means derives first and second passing signals of the covering portion of the electric wire terminal portion and the bare core wire portion, and compares the lengths of the first and second passing signals by the determining means. A stripping state checking step of checking the stripping state of the coating according to whether the difference is greater than or less than a predetermined value.