JPH0160391B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The automatic scanning detector of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Prior art [Figs. 6 to 8] D. Problems to be solved by the invention E. Means for solving the problems F. Example a. Detector [Fig. 1] [Fig. 4] b. Operation c. Usage example of using the detector in an automatic copy welding machine [Fig. 5] d. Operation The present invention relates to an automatic tracing detector suitable for correctly guiding a torch by tracing a welding groove. In detail, in an automatic tracing detector that uses a contact contact method to detect the tilting state of a detection rod that traces a welding groove, etc., it eliminates the deformation and misalignment of the contact pin due to repeated collisions of the detection rod, and provides a stable and stable system at all times. This is to ensure detection accuracy.

(B. Summary of the Invention) The automatic scanning detector of the present invention utilizes a ready-made metal connector, has contact pins fixed to the connection terminals of the metal connector, and has a base portion excluding the portion where the center electrode of the contact pin contacts. The contact pin is molded with an insulating material to prevent it from deforming or shifting its position.

(C. Prior Art) [Figs. 6 to 8] Conventionally, there have been automatic scanning detectors that detect the tilting state of a detection rod using a contact method, as shown in Figs. 6 to 8.

In the drawing, a denotes an automatic tracing detector, and the detector a has a cylindrical body b made of a suitable metal material, one end protrudes from the cylinder b, and is supported by a swivel bearing c against the cylinder b. The detection rod d is tiltably supported.

A center electrode e is formed at the opposite end of the detection rod d from the protrusion, and a contact g is detachably attached to the end protruding from the cylinder b via a connecting fitting f. Furthermore, four contact pins h ₁ , h ₂ , h ₃ , and h ₄ arranged so as to surround the outer periphery of the center electrode e are held at the opposite protruding end of the detection rod d of the cylinder b. A pin holder i is attached. Further, a spring j is arranged in the cylinder b to bias the detection rod d so that the center electrode e comes into contact with two adjacent contact pins h ₃ and h ₄ selected from among the contact pins. ing.

By the way, at present, as the pin holder i, a ready-made cable connector k called a metal connector is used from the standpoint of reducing the cost of the detector a.

That is, the metal connector k has four connection pins l ₁ , l ₂ ,
l ₃ , l ₄ (l ₂ is not shown in the drawing) are protruded, and four elongated cylindrical connectors m ₁ ,
Flat cylindrical insulator n with protruding m ₂ , m ₃ and m ₄
and a metal cylindrical body o that covers the outer peripheral wall of the insulator n, and the four connection pins _l1 to _l4 are arranged so as not to protrude from one open end surface of the cylindrical body o.
Further, the four connectors m ₁ to m ₄ are positioned so as to protrude from the other open end surface of the cylindrical body o.

Then, the contact pins h _{1 to h 4 are individually fixed to the four connection terminals m 1 to} m ₄ of such a metal connector _k by soldering so that their axes coincide with each other, thereby forming a pin holder i. do.

Then, connect the contact pins _h1 to _h4 to the metal connector k.
The pin holder i with the attached pin holder i is fitted by fitting or screwing into the rear end opening of the cylinder b.

Thus, such a contact type automatic tracing detector a traces the welding groove p by bringing its contact g into contact with the welding groove p. Then, due to the bending of the welding groove p in the plane direction or the up and down undulations in the vertical direction, the detection rod d is tilted, and the center electrode e
will repeatedly come into contact with the contact pins _h1 to _h4 .

(D Problems to be Solved by the Invention) However, in the conventional contact type automatic copying detector a as described above, the contact pins h 1 to m 4 are connected to the connection terminals m ₁ to m ₄ of the ready-made metal connector _k . Since the contact pins h ₄ are soldered to each other, the length of the pin extending from the insulator n becomes long and comes into contact with the center electrode e near the tip, and after long-term use, the contact pins h ₁ to h ₄ The distance between them has widened,
It may reduce the detection accuracy of detector a,
In the worst case, there was a problem that the contact pins _h1 to _h4 would be bent.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the automatic copying detector of the present invention has the following features: after soldering the contact pins to the connection terminals of the metal connector, the center electrodes of the contact pins make contact. It is molded integrally with an insulating material, except for the parts where it is attached.

Therefore, according to the automatic tracing detector of the present invention, since the part of the contact pin excluding the part where the center electrode contacts is molded with an insulating material, it does not easily bend even when the center electrode contacts it. , its position will not go awry, and a certain degree of accuracy can be maintained for a long period of time.

(F. Embodiment) Details of the automatic scanning detector of the present invention will be described below with reference to illustrated embodiments.

(a Detector) [Figures 1 to 4] In the drawings, 1 is an automatic scanning detector,
The detector 1 includes a cylindrical body 2 made of a suitable metal material, and a detection rod 4 whose one end protrudes from the body 2 and is tiltably supported with respect to the body 2 by a swivel bearing 3. ing. The detection rod 4 has a center electrode 5 at its opposite end to the cylindrical body 2.
A contact 7 is detachably attached to the protruding end of the cylindrical body 2 via a connecting fitting 6.

Furthermore, four contact pins 8 ₁ , 8 ₂ are arranged to surround the outer periphery of the center electrode 5 at the end of the cylindrical body 2 opposite to the end from which the detection rod 4 protrudes. , 8 ₃ , 8 ₄ is attached to the pin holder 9 .

Furthermore, a cap 10 that closes the open end of the cylindrical body 2 is fitted onto the end from which the detection rod 4 protrudes, and the cap 10 and the connecting fitting 6 are connected to each other.
A dust-proof rubber gasket 11 is inserted between the end faces.

The pin holder 9 uses a ready-made metal connector 12, and the metal connector 1
Reference numeral 2 is similar to the metal connector k described in the prior art example.

That is, the metal connector 12 has four connection pins 13 ₁ , 13 ₂ , 13 ₃ , 13 ₄ (1 in the drawing) connected to other connection connectors on one end surface thereof.
3 ₄ is not shown. ) is projected, and four elongated cylindrical connection terminals 14 ₁ , 1 are provided on the other end surface.
It is composed of a flat cylindrical insulator 15 from which protruding portions 4 ₂ , 14 ₃ , and 14 ₄ are formed, and a metal cylindrical body 16 that covers the outer peripheral wall of the insulator 15, and the four connection pins 13 ₁ to 14 4 are connected to each other. 13 ₄ is arranged so that it does not protrude from one open end surface of the cylindrical body 16, and the four connection terminals 14 ₁ to 14 ₄ protrude from the other open end surface of the cylindrical body 16. It is something.

The pin holder 9 has the contact pins 8 ₁ to 8 ₄ individually soldered to the connection terminals 14 ₁ to 14 ₄ of such a ready-made metal connector 12 so that their axes coincide with each other, and Connecting terminal 14, leaving the tips of pins ₈₁ to ₈₄
The other parts including ₁ to 14 ₄ are molded with an insulating material 17 such as epoxy resin, and a reinforcing collar 18 covering the outer periphery of the insulating material 17 is fixed.

Reference numeral 19 denotes a spring for biasing the detection rod 4 in one direction so that the center electrode 5 comes into contact with two adjacent contact pins 8 ₃ and 8 ₄ selected from among the contact pins. It is attached to a cylindrical holder 20 that is fitted and fixed to the cylindrical body 2, and is brought into contact with the detection rod 4 via a pusher piece 21.

22 is a connection connector connected to the pin holder 9 from the rear, and connects the connection pins 13 ₁ to 13 ₄ arranged at the rear of the pin holder 9 and a control circuit (not shown) of the automatic copy welding machine. This is to ensure electrical continuity between the A cable 23 is connected to the connector 22, and each of the contact pins 8 ₁ to 8 ₄ is connected to a control circuit of the automatic copy welding machine via the cable 23, respectively.

(b Operation) In the detector 1 described above, depending on the direction in which the detection rod 4 is tilted, the center electrode 5 is caused to touch the contact pin 8.
The center electrode 5 is in any one of the states of contacting one or two of the contact pins ₁ to ₈ and the state of not contacting any of the contact pins, and which state is the center electrode 5 in? The direction in which the detection rod 4 is tilted can be detected.

(Example of use of c detector in automatic copying welding machine)
[FIG. 5] FIG. 5 shows an overall view of an automatic tracing welding machine using the automatic tracing detector 1 of the present invention.

The welding machine includes a first slide mechanism 24 that moves in one direction (left-right direction), and a second slide mechanism 25 that moves in a direction perpendicular to the direction of movement by the slide mechanism 24 (vertical direction).
It is equipped with

The first slide mechanism 24 is connected to the welding base material 2
The movable portion 28 of the first slide mechanism 24 is held by a feeding mechanism (not shown) that operates along the line of the grooves 27 of the first slide mechanism 24.
is a feed screw (not shown) rotated by a left-right motor 29 mounted on the slide mechanism 24;
etc., and the movable part 2
8 has the second slide mechanism 25 fixed thereto.

The second slide mechanism 25 also includes a movable part 31 that is slid in the vertical direction by a feed screw (not shown) or the like that is rotated by a vertical motor 30 mounted on the second slide mechanism 25. Part 31
A bracket 32 extends horizontally from this point.
The base of the bracket 32 is fixed, and the tip of the bracket 32 is provided with an adjustment block 33 and a holder 3 for finely adjusting the position in the horizontal and vertical directions.
The detector 1 is held to follow the welding groove 27 of the base metals 26, 26 through the welding groove 4.

That is, the position adjustment block 33 is moved to the first slide mechanism 24 by the knob 35 provided thereon.
The position adjustment block 33 is equipped with a knob 36 that can be finely adjusted in the vertical direction that is the same as the direction of movement by the second slide mechanism 25. A shaft 37 is provided, the shaft 37
The holder 34 is connected to the lower end of the holder 34 via a connecting fitting 38.
are connected together, and by operating the knobs 35 and 36, the detection rod 4 of the detector 1 held by the holder 34 is moved to the groove 27 of the base materials 26 and 26.
It is now possible to align the

A welding torch 39 is fixed to the bracket 32 at a position slightly behind the adjustment block 33 so as to be perpendicular to the base material 26.

The detector 1 is attached to the holder 34 by inserting the cylinder 2 of the detector 1 from an oblique direction into the mounting hole 40 formed in the holder 34 and tightening the tightening screw 41. . After installation, the position of the detection rod 4 is adjusted by operating the knobs 35 and 36 of the adjustment block 33 so as to maintain an appropriate positional relationship with respect to the welding torch 39.
Incidentally, the distance between the tip of the contactor 7 of the detection rod 4 and the tip of the welding torch 39 is made as small as possible to the extent that welding can be performed without any trouble in order to reduce the scanning error.

(d. Operation of automatic copy welding machine) This automatic copy welding machine operates as follows.

When the detection rod 4 of the detector 1 is not pressed against the groove 27 and the center electrode 5 is in contact with the contact pins 8 ₃ and 8 ₄ by the spring 19, the vertical movement motor 30 is reversely rotated. Then, the movable part 31 is lowered. As the movable part 31 descends, the welding torch 39 integrated with the bracket 32 and the detector 1 are lowered toward the groove 27, and the contact 7 provided at the tip of the detection rod 4 of the detector 1 Upon contacting the groove 27, the detection rod 4 is slightly rotated in the clockwise direction (see FIG. 1) about the bearing 3 as a fulcrum against the elastic force of the spring 19, and the center electrode 5 is connected to the contact pin 8 ₃ , 8 ₄ , the rotation of the vertical movement motor 30 is stopped, and at the same time, the downward movement of the movable portion 31 of the slide mechanism 25 is also stopped. This means that the welding torch 39 is set at the optimum position relative to the welding groove 27 of the base metals 26, 26.

The first and second slide mechanisms 24,
When the entire copy welding machine including 25 is fed by a feeding mechanism (not shown), the detector 1 detects the base material 2.
Following the grooves 27 of 6 and 26, the welding torch 39 sequentially welds the grooves 27 while being guided by them.

At this time, if the line of the groove 27 has a bend in the plane direction of the base material or an undulation in the thickness direction of the base material, the detection rod 4 follows this and rotates around the bearing 3, and at the same time the center electrode 5 Contact pin 8 ₁ to 8 ₄
Touch one or two of the following. Then, the motors 29, 30 rotate forward or backward accordingly, and each slide mechanism 24, 25 moves in the left-right direction or up-down direction, so that the welding torch 39 always follows the groove line.

Further, even if the detection rod 4 is rotated due to a change in the line of the groove 27 and the center electrode 5 is pressed against the contact pins 8 ₁ to 8 ₄ from inside due to this rotation, the connection terminal 14 ₁ Contact pins 8 including 14 to ₄
The base of ₁ to 8 ₄ is insulating material 17 and reinforcing collar 1
8, the contact pins 8 ₁ to 8 ₄ are not deformed by bending outward, the distance between the two contacts can be maintained constant, and contact failure or non-contact can be completely eliminated. Stable detection accuracy can be maintained.

(G Effect of the Invention) As is clear from the above description, the automatic tracing detector of the present invention has a detection rod inserted into the cylinder so that one end thereof protrudes from the tip of the cylinder. The middle part of the detection rod is tiltably supported, a center electrode is provided at the end opposite to the protrusion of the detection rod, and a center electrode is provided at the end of the cylinder opposite to the protrusion from the detection rod so as to surround the center electrode. A pin holder is installed to hold the contact pin, and the pin holder uses an off-the-shelf metal connector to secure the contact pin to the connection terminal of the metal connector, and connects the center electrode of the contact pin with the pin holder. It is characterized in that the parts other than the contact parts are molded with an insulating material together with the connecting terminals.

Therefore, even if the center electrode repeatedly hits the contact pin as the detection rod tilts, the contact pin will hardly be deformed by bending outward, making it possible to maintain stable detection accuracy and reduce the length of the detector. It is possible to extend the service life.

[Brief explanation of drawings]

1 to 4 show an example of the implementation of the automatic scanning detector of the present invention.
The figure is a perspective view of the pin holder, and Figure 3 is the − of Figure 1.
4 is a longitudinal sectional view of the pin holder, FIG. 5 is an overall perspective view showing an example of an automatic tracing welding machine using the automatic tracing detector of the present invention, and FIGS. 6 to 8 The figure shows a conventional automatic scanning detector.
6 is a longitudinal sectional view, FIG. 7 is a sectional view taken along the line - in FIG. 6, and FIG. 8 is a longitudinal sectional view of the pin holder. Explanation of symbols, 1...Automatic copying detector, 2...Cylinder, 4...Detection rod, 5...Center electrode, 8 ₁ to 8 ₄
... Contact pin, 9 ... Pin holder, 12 ... Metal connector, 14 ₁ to 14 ₄ ... Connection terminal, 17
……Insulator.

Claims (1)

[Scope of Claims] 1. A detection rod is inserted into a cylinder so that one end thereof protrudes from the tip of the cylinder, an intermediate part of the detection rod is tiltably supported within the cylinder, and the detection rod is prevented from protruding. A center electrode is provided at the end, and a pin holder for holding a contact pin arranged to surround the center electrode is attached to the end of the cylindrical body opposite to the protruding side of the detection rod. The tool is characterized in that a ready-made metal connector is used, the contact pin is fixed to the connection terminal of the metal connector, and the part of the contact pin other than the contact part with the center electrode is molded with an insulating material together with the connection terminal. Automatic copying detector.