JPH05188157A - Nut detecting apparatus - Google Patents

Abstract

PURPOSE:To obtain a nut detecting apparatus, which prevents the occurrence of erroneous recognition for the presence or absence of a nut and can positively determine the position of a base material. CONSTITUTION:A locating pin 11 is inserted into a female screw part 6a of a nut 6, which is fixed to a base material 1 by way of a through hole 1a from the other single-side surface of the base material. Compressed air is jetted through a jetting port 11c, which is provided at an outer surface part 11d of the locating pin 11. The jetting resistance at this time is detected with a pressure sensor 12. When the pressure is high, it is judged that there is the nut 6. When the pressure is low, it is judged that the nut 6 is not present.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut detecting device for detecting the presence or absence of a nut fixed at a position which is difficult to see from the outside on one side of a plate material.

[0002]

2. Description of the Related Art Generally, the conventional type of
For example, there is one as shown in FIG. In this, a nut 6 is fixed to one surface side (upper surface side) of a flat base material 1 by welding or the like, and a hat channel 3 is placed on the base material 1 (not fixed). As a result, the nut 6 is arranged in the space 4 formed by the base material 1 and the hat channel 3, so whether or not the nut 6 is securely fixed to the base material 1. Is difficult to visually recognize from the outside.

Therefore, conventionally, the presence or absence of the nut 6 is confirmed as follows. That is, the base material 1 and the like as described above are lowered, and the stepped locate pin 5 is inserted into the female screw portion 6 a of the nut 6 through the insertion hole 1 a of the base material 1.

When the bottom surface of the nut 6 comes into contact with the step portion 5a of the stepped locate pin 5, the stepped locate pin 5 is pushed downward against the urging force of the spring 7, and this lowering causes the limit. The switch 8 is turned on. As a result, the presence or absence of the nut 6 will be confirmed.

On the other hand, when the nut 6 is not present, the stepped funnel pin 5 is inserted into the insertion hole 1a of the base material 1, is not pushed down against the urging force of the spring 7, and the limit switch 8 is turned on. Therefore, the presence or absence of the nut 6 can be recognized.

When the presence or absence of the nut 6 is confirmed, the stepped locate pin 5 is inserted into the nut 6 and the base material 1 is positioned at a predetermined position.
The base material 1 and the hat channel 3 are fixed to each other.

[0007]

However, in such a conventional one, when the position of the base material 1 deviates from the stepped locate pin 5, the locate pin 5 is moved.
The step portion 5a of the
Even if the nut 6 is not present, the locate pin 5 is lowered and the limit switch 8 is turned on, resulting in erroneous detection.

Further, the stepped locate pin 5 is inserted into the nut 6 so as to be positioned in the left-right direction. However, since the stepped locate pin 5 moves up and down,
Since there is some play in the left-right direction, it is not possible to reliably position in the left-right direction.

Therefore, it is an object of the present invention to provide a nut detecting device which can prevent misjudgment in the presence / absence of a nut and can surely position a base material.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and in a nut detecting device for detecting the presence or absence of a nut arranged on one side of a plate material, From one side of the other side of the plate member, a locate pin that is inserted into the female screw portion of the nut through the insertion hole of the plate member, and the locate pin, which is provided on the peripheral surface portion of the portion that is inserted into the female screw portion, The present invention is characterized in that it is a nut detecting device having a detecting means for detecting the presence or absence of a nut.

[0011]

[Operation] According to such means, the locate pin is inserted into the female screw portion of the nut fixed to the plate member from the other side of the plate member through the insertion hole, and the detection provided on the peripheral surface portion of the locate pin is performed. The presence or absence of the nut is detected by means. By providing the detecting means on the peripheral surface of the locate pin in this manner, it is not necessary to use a locate pin having a step like that in the related art, so that the conventional misidentification does not occur.

[0012]

EXAMPLES The present invention will be described below based on examples.

FIG. 1 is a diagram showing an embodiment of the present invention. The same or equivalent members and parts as the conventional ones will be described with the same reference numerals.

First, in the nut detecting device of this embodiment, a locate pin 11 having an upper portion 11a formed in a tapered shape is fixed to a jig section and a clamp (not shown), and the locate pin 11 has an air passage 1.
1b is formed, and the air passage 11b is formed by the pressure sensor 1
It is connected via 2 to a compressed air source (not shown).

In the air passage 11b, a jet port 11c from which air is jetted is a peripheral surface portion 11d of the locate pin 11.
Thus, it is formed at a position corresponding to the female screw portion 6a of the nut 6.

The detection means of this embodiment is based on the air passage 11
It is composed of the ejection port 11c of b, the pressure sensor 12, and the like.

Next, the operation of the nut detecting device having the above construction will be described.

The base material 1 as a plate material is lowered, and the locating pin 11 is inserted into the female screw portion 6a of the nut 6 from the other one surface side (lower surface side in the drawing) through the insertion hole 1a. In this case, since the upper portion 11a of the locate pin 11 is tapered, the position of the nut 6 may be slightly different.
The locating pin 11 can be inserted into the nut 6 even if it is displaced from the position. Then, the air pressure-fed from a compressed air source (not shown) is jetted from the jet port 11c of the air passage 11b between the locate pin 11 and the nut 6. In this way, when the nut 6 is present or absent, the resistance of the air jetted from the jet port 11c increases, so the pressure detected by the pressure sensor 12 also increases. The presence or absence of the nut 6 can be confirmed from this value.

On the other hand, when the nut 6 is not present, the resistance of the air jetted from the jet port 11c is small, so the value detected by the pressure sensor 12 is also small, and it is judged that the nut 6 is not present. At this time, since the locate pin 11 is not stepped, even if the positional relationship between the insertion hole 1a of the base material 1 and the mounting position of the nut 6 is slightly different, the insertion hole of the base material 1 is different from the conventional one. There is no possibility of erroneous recognition due to the influence of the peripheral portion of 1a.

When the nut 6 is present, the locate pin 11 is inserted into the nut 6, so that the locate pin 11 can position the base material 1 in the left-right direction, and the base material 1 and the hat channel 3 can be positioned. And can be fixed in a predetermined positional relationship. In this case, since the locate pin 11 does not slide in the vertical direction as in the conventional case and is completely fixed, there is no play in the horizontal direction.
The positioning performance is also improved. Conventionally, since the presence or absence of the nut 6 is detected by moving the stepped locate pin 5 up and down, the conventional locate pin 5 inevitably has rattling in the left-right direction.

Although the detecting means of the above embodiment detects the presence or absence of the nut 6 by injecting air from the locate pin 11 to detect the presence or absence of the pressure, the invention is not limited to this, and the light is emitted from the peripheral surface of the locate pin. Then, the presence or absence of the nut can be detected by detecting the reflected light with an optical sensor.

[0022]

As described above, according to the present invention, the presence or absence of the nut can be accurately detected without causing the locating pin to come into contact with the peripheral edge portion of the insertion hole of the plate material to cause a malfunction as in the prior art. it can. In addition, it is not necessary to move the locating pin up and down as in the past, and the locating pin can be fixed so that the plate material to which the nut is fixed can be accurately positioned by this locating pin, which is a useful effect in practice. To do.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a nut detecting device of the present invention.

FIG. 2 is a sectional view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 1 Base material (plate material) 6 Nut 6a Female thread 11 Locating pin 11d Peripheral surface Detection means 11c Jet 12 Pressure sensor

Claims (1)

[Claims] 1. A nut detecting device for detecting the presence or absence of a nut arranged on one side of a plate member, wherein a female screw of the nut is inserted from the other side of the plate member through an insertion hole of the plate member. A nut detecting device comprising: a locating pin to be inserted into a portion; and a detecting means provided on a peripheral surface portion of the locating pin to be inserted into the female screw portion and detecting the presence or absence of the nut.