JPH09254188A - Connector pin breakage detector of mold for molding connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the mixing with an inferior product caused by the breakage of a connector pin present in the molding of a connector by comparing a preset pattern at a normal time with a detection pattern by detection to detect whether the breakage of the connector pin is present. SOLUTION: Through-holes 5 are provided to the central parts of a plurality of core pins 2 and allowed to communicate with a guide pipe 7 guiding the air from the air pressure source 6 provided to a core mold 1 to the respective through-holes 5 from one ends of a plurality of the core pins 2. A pressure detector 8 detects the pressure of air sent from an air pressure source 6 to the guide pipe 7 and the through-holes 5. A comparator 9 compares the air pressure value detected by the pressure detector 8 with a predetermined reference air pressure value transmitted as an electric signal (s). When both pressure values are different, this state acts on a controller 11 to immediately stop operation. By this constitution, the mixing with an inferior product caused by the breakage of a connector pin present in the molding of a connector can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector pin breakage detecting device for a connector molding die for molding a connector such as an electric cable.

[0002]

2. Description of the Related Art Connector pins of a connector molding die are easily broken, and most of the causes of defects of molded products after steady operation of the connector molding are often caused by the loss of the connector pins in the mold. It was necessary to stop the molding operation immediately after finding the defect. If the discovery of breakage of the connector pins is delayed, a large amount of defective products will be molded, and it is necessary to visually inspect all the molded connector pins, which requires a lot of time and labor.

[0003]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a connector pin breakage detecting device which immediately stops the molding operation when a defect of the connector pin is found and does not require much time and work such as visual inspection. To provide.

[0004]

In order to achieve the above-mentioned object, the present invention comprises a plurality of axially extending through-holes fixed at one end thereof and projecting into the cavity of a connector molding die. A connector pin, and a conducting tube that guides air from an air pressure source from one end of each of the plurality of connector pins to a through hole,
An air pressure sensor for detecting the air pressure in the conduit, a reference air pressure supply device for transmitting a predetermined reference air pressure value, and an air pressure value detected by the air pressure sensor and a value from the reference air pressure supply device are compared. When the values are different, a comparator that sends an abnormal signal and a trigger signal transmitter that acts on the comparator and indicates the timing for comparing the value detected by the air pressure sensor and the value from the reference air pressure supply device are provided. A connector pin breakage detecting device for a connector molding die is formed.

Further, instead of detecting the connector pin breakage by the through-hole-provided connector pin and the air pressure sensor, the connector pin breakage detection is performed by a photoelectric sensor that applies light to the other end surface which is the free end of the connector pin with one end fixed. And a connector pin breakage detection device for a connector molding die.

Further, instead of detecting the breakage of the connector pin by the connector pin having the through hole and the air pressure sensor, the breakage of the connector pin is detected by the magnetic sensor for detecting the position of the free end of the connector pin having one end fixed. The connector pin breakage detection device of the connector molding die is as follows.

Further, photoelectric sensors or air pressure sensors are arranged in a matrix corresponding to the arrangement of the connector pins, and the presence or absence of breakage of the connector pins is checked by comparing a preset normal pattern with a detection pattern by detection. A connector pin breakage detection device for a connector molding die for detecting is provided.

Furthermore, in synchronism with the mold opening operation of the injection molding machine, the photoelectric sensor or the magnetic sensor is brought close to the connector pin to detect the pin breakage, and after the pin breakage is detected, the pin is retracted from the vicinity of the pin. Is suitable.

Further, instead of detecting the connector pin breakage by the through-hole-provided connector pin and the air pressure sensor, the other end surface which is the free end of the connector pin fixed at one end is pressed against the piezoelectric element to detect the connector pin breakage. Is suitable.

Furthermore, piezoelectric elements are arranged in a matrix corresponding to the arrangement of the connector pins, and the presence or absence of breakage of the connector pins is detected by comparing a preset normal pattern with a detection pattern obtained by detection. It is preferable to do so.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the connector pin breakage detecting device of the present invention, the other end, which is the free end of the connector pin, is formed into a matrix shape by an air pressure sensor, a magnetic sensor or a photoelectric sensor, and further in accordance with the arrangement of the connector pins. Photoelectric sensor,
The presence or absence of breakage of the connector pin is detected by arranging magnetic sensors or piezoelectric elements and comparing the preset normal pattern with the detection pattern of the detection.When the pin breakage is found, the molding operation is stopped immediately. did.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a core mold, which is mounted in a cantilever state in which a plurality of core pins 2 (connector pins) are fixed at one end and the other end is a free end, and is fixed by a mold clamping device (not shown). When the molds 1 and 3 come in contact with each other and move toward and away from the mold 3, the other ends of the plurality of core pins 2 are fitted into the recesses 4 in the fixed mold 3, respectively.

Through holes 5 are provided in the central portions of the plurality of core pins 2, respectively, and air from an air pressure source 6 provided in the core mold 1 is penetrated from one end of each of the plurality of core pins 2. It communicates with a conduit 7 leading to the hole 5. Reference numeral 8 denotes a pressure detector, which detects the pressure of air sent from the air pressure source 6 to the conduit 7 and the through hole 5.

Reference numeral 9 denotes a comparator, which compares the air pressure detected by the pressure detector 8 with a reference air pressure value which transmits a predetermined reference air pressure value (not shown) as an electric signal s, and when both pressure values are different from each other. The controller 11 of the molding machine 10 is judged to be abnormal and the operation is immediately stopped. The timing for comparing the two pressure values is, for example, when the electric signal t is transmitted from the trigger signal transmitting device (not shown) when the mold closing is completed and the comparator 9 receives the signal t.

With the structure as described above, if one of the core pins 2a is broken, as shown in FIG. 2, the tip of the core pin 2a has a fixed mold. 3 cannot be fitted into the recess 4 and
Since air leaks from the tip, the pressure detector 8 cannot detect a predetermined pressure value, and the comparator 9 judges that it is abnormal and stops the operation of the molding machine 10.

Another embodiment of the present invention will be described with reference to FIG. 3. A piezoelectric element 12 is provided which converts the pressure into an electric signal when pressure is applied to the fixed mold 3, and the core mold 1 and the fixed mold 3 are provided. It is also possible to detect the breakage of the core pin 13 by pressing the tips of the plurality of core pins 13 attached to the core mold 1 in a cantilevered state against the piezoelectric element 12 when the core pins abut. That is, when some of the plurality of core pins 13 are broken, the broken core pins 13 are not pressed against the piezoelectric element 12, so that an electric signal from the corresponding core pin 13 is not transmitted and the core pin 13 is not transmitted. Can be detected.

Here, with respect to the core pin 13, the piezoelectric element 12
Are arranged in a matrix, the reference matrix 15 and the judgment matrix 16 are prepared as shown in FIG. 4, and when the example heave 16a in the judgment matrix 16 cannot be detected, the corresponding core pin 13 is You can see that it is broken.

Further, light L is applied from the photoelectric sensor 17 to the end surface of the core pin 13 of the core mold 1 opened as shown in FIG. 5, and the breakage of the core pin 13 can be detected by the presence or absence of the reflected light l. That is, when the core pin 13a is broken, the light L striking the tip is not reflected straight, and the photoelectric sensor 17 cannot receive the reflected light la,
It can be seen that the core pin 13 is broken. Also in this case, the photoelectric sensors 17 are arranged in a matrix as described above,
As shown in FIG. 4, the breakage of the core pin 13 can be detected by the reference matrix 15 and the judgment matrix 16.

It is preferable that the plurality of photoelectric sensors 17 described above are arranged so that the detectors 18 arranged in accordance with the core pins 13 are brought close to the core pins 13 each time the mold is opened in synchronization with the mold opening operation. Further, not only the photoelectric sensor and the piezoelectric element as described above, but also the magnetic sensor can detect the position of the other end of the core pin 13, or the breakage of the core pin can be detected by comparing the reference matrix and the determination matrix. . Further, instead of the photoelectric sensor, the piezoelectric element, and the magnetic sensor, an image processing device by binarization can be used.

[0020]

As described above, in the present invention,
It is possible to prevent a defective product from being mixed due to breakage of the connector pin existing in the connector molding.

[Brief description of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a view showing an embodiment of the present invention and is an explanatory view when a connector pin is broken.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing still another embodiment of the present invention and is a diagram showing an example of comparison with a matrix.

FIG. 5 is a view showing still another embodiment of the present invention, showing a detection method by a photoelectric sensor.

[Explanation of symbols]

 1 core mold 2 core pin (connector pin) 3 fixed mold 4 recess 5 through hole 6 air source 7 conduit tube 8 pressure detector 9 comparator 10 molding machine 11 controller 12 piezoelectric element 13 core pin (connector pin) 15 reference matrix 16 Judgment matrix 17 Photoelectric sensor 18 Detector

Claims (7)

[Claims] 1. A plurality of connector pins each having a through hole provided in each axial direction and fixed at one end thereof and protruding into a cavity of a connector molding die, and air from an air pressure source for the plurality of connector pins. A conducting pipe leading from one end to each through hole, an air pressure sensor for detecting the air pressure in the conducting pipe, a reference air pressure supply device for transmitting a predetermined reference air pressure value, and an air pressure value detected by the air pressure sensor. The values from the reference air pressure supply device are compared, and when the two values are different, a comparator that emits an abnormal signal and acts on the comparator, and the value detected by the air pressure sensor and the value from the reference air pressure supply device are compared. A connector pin breakage detecting device for a connector molding die, comprising a trigger signal transmitter for instructing a timing for comparison. 2. A connector pin breakage detection by a photoelectric sensor for irradiating light to the other end surface which is a free end of the connector pin fixed at one end, instead of the connector pin breakage detection by the connector pin having the through hole and the air pressure sensor. The connector pin breakage detection device for a connector molding die according to claim 1, characterized in that. 3. The connector pin breakage detection using a magnetic sensor that detects the position of the free end of the connector pin with one end fixed, instead of the connector pin breakage detection using the connector pin having the through hole and the air pressure sensor. A connector pin breakage detection device for a connector molding die according to claim 1. 4. The presence or absence of breakage of the connector pins is determined by arranging photoelectric sensors or magnetic sensors in a matrix corresponding to the arrangement of the connector pins and comparing a preset normal pattern with a detection pattern. The connector pin breakage detecting device for a connector molding die according to any one of claims 2 and 3, which is for detecting. 5. The photoelectric sensor or the magnetic sensor is brought close to the connector pin in synchronization with the mold opening operation of the injection molding machine,
The pin breakage is detected, and after the pin breakage is detected, the pin is retracted from the vicinity of the pin.
And a connector pin breakage detecting device for a connector molding die according to any one of claims 1 to 3. 6. A connector pin breakage detection is performed by pressing the other end surface, which is a free end of the connector pin having one end fixed thereto, to the piezoelectric element instead of the connector pin breakage detection by the connector pin having the through hole and the air pressure sensor. The connector pin breakage detection device for a connector molding die according to claim 1, wherein: 7. Detecting the presence or absence of breakage of connector pins by arranging piezoelectric elements in a matrix shape corresponding to the arrangement of connector pins and comparing a preset normal pattern and a detection pattern by detection. A connector pin breakage detection device for a connector molding die according to claim 6.