JPH0686015B2 - Copy detector - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel scanning detector. Specifically, a detection rod having a groove contact end that contacts the welding groove and a substantially intermediate portion of which is supported in a tiltable manner in a casing, and a detection target that forms an end portion on the side opposite to the groove contact end of the detection rod. Detecting means for detecting the movement of the groove contact end in cooperation with the portion, and elastic means for urging the detection rod in the direction of elastically contacting the groove contact end with the welding groove. A scanning detector equipped with
In particular, the detection means detects the tilting of the detection rod by contacting the contact portion forming the detected portion of the detection rod and the plurality of detection contacts arranged around the axis of the contact portion, that is, the contact portion, and detects at least the groove. The present invention relates to a scanning detector including a plurality of detection contacts including an ascending detection contact for detecting an upward displacement of a contact end and a descending detection contact for detecting a downward displacement of a groove contact end. By simply increasing the number of detection contacts, it is possible to instantly detect that the groove contact end is out of the welding groove without impairing the detection operation of the unevenness of the welding groove, and the normal detection can be performed. An object of the present invention is to provide a novel scanning detector capable of easily setting the tilt amount at the time of detecting the end with respect to the neutral range which is the tilt allowable range of the detection rod when performing.

[0002]

2. Description of the Related Art In an automatic copying welder, a welding line of an object to be welded (hereinafter referred to as "welding base material"), that is,
A scanning detector is provided for detecting the unevenness of the welding groove, and welding is performed while controlling the position of the welding torch according to the information of the unevenness detected by the scanning detector.

There are several types of such scanning detectors, and one of them is a tiltable detection rod having a groove contact end for contacting a welding groove and a detected portion, and the above-mentioned. Some include a detection means for detecting the movement of the detected portion.

Most of the detecting means in this type of scanning detector has a structure in which a plurality of detecting contacts corresponding to the direction in which the groove contact end is displaced around the axis of the detected portion of the detecting rod are arranged. .

FIG. 15 shows an example a of a conventional scanning detector provided with such a detection contact.

In FIG. 1, b is a substantially cylindrical casing, which is attached to the welding machine so as to move integrally with a welding torch (not shown).

Reference numeral c is a detection rod, one end d of which is a groove contact end which contacts the welding groove e, the other end f of which is a conductive contact portion, and a substantially intermediate portion g of which is a casing b. It is tiltably supported by. Reference numeral h is a spring for energizing the detection rod c in the direction in which the groove contact end d contacts the welding groove e.

Reference numeral i designates a detecting portion arranged inside the casing b, which is provided with a plurality of detecting contacts (only two are shown in the drawing) arranged around the axis of the contact portion f. That is, j is an ascending detection contact for detecting the upward displacement of the groove contact end d, and k is a descending detection contact for detecting the downward displacement. These ascending detection contact j and descending detection contact k Are arranged on opposite sides of the contact point f. Further, two other detection contacts (not shown) for detecting the displacement of the groove contact end d in the left-right direction are arranged on a straight line substantially orthogonal to a straight line connecting the rising detection contact j and the falling detection contact k. There is.

A welding groove e by such a profile detector a
Is detected as follows.

For example, when used in a so-called ambidextrous form, that is, when the welded portions of two welding base materials are butted to each other and the abutted portions are used as welding grooves to perform welding, The direction of the rotational force of the detection rod c by the spring h is set so that the contact point f is in contact with the descending detection contact k, and when the groove contact end d is not in contact with the welding groove e, the contact part is As shown by the solid line in the figure, f is held at a position in contact with the descending detection contact k, and the contact part f has a certain width such that it does not contact either the descending detection contact k or the ascending detection contact j. The detection operation is performed with the existing position as the neutral position. Specifically, the scanning detector a is lowered toward the start end of the welding groove e, the groove contact end d is brought into contact with the welding groove e and is relatively pressed, and the contact portion f is moved downward. When the contact portion f is contacted with the ascending detection contact j as shown by the two-dot chain line in the figure, the groove contact end d is the allowable amount. When the contact point f comes into contact with the downward detection contact k, the groove contact end d exceeds the permissible amount. The downward displacement, that is, the detector a is excessively displaced upward is detected.

The position of the welding torch is controlled in accordance with such detection information.

When used in a so-called left-handed or right-handed unilateral copying form, the direction of the rotational force of the detection rod c urged by the spring h is about 45 ° in the axial direction.
When the switching contact edge d is not in contact with the welding groove e, the contact portion f is brought into contact with both the predetermined detection contact on either the left or right side and the descending detection contact k.

[0013]

By the way, in such a profile detector a, even when the groove contact end d is dislocated from the end of the welding groove e, the contact portion f becomes the descending detection contact k. Since it is determined that the groove contact end d is displaced downward due to the contact, that is, the detector a is displaced upward, the downward displacement of the groove contact end d in this case is detected during scanning. It needs to be detected instantaneously separately from the downward displacement. That is, if they cannot be detected separately, the welding torch descends until it collides with the welding groove e or a portion in the vicinity thereof.

Therefore, this type of copying detector a is usually provided with a special detecting means (hereinafter referred to as "end detecting means") for detecting that the groove contact end d is out of the welding groove e. .) Is provided.

However, such a conventional end detecting means has a complicated structure and has no mechanical relationship with the detecting contact, so that there is a problem that the detecting operation is poor in reliability.

[0016]

Therefore, in order to solve the above-mentioned problems, the copying detector of the present invention is an end detection contact for detecting that the groove contact end of the detection rod is out of the welding groove. And an ascending detection contact for detecting the upward displacement of the groove contact end are arranged substantially opposite to each other with the contact portion of the detection rod interposed therebetween to detect the downward displacement of the groove contact end. The descending detection contact is provided with an elastic part having spring elasticity and is arranged between the contact part and the ascending detection contact, and when the groove contact end is not in contact with the welding groove, the contact part is the end detection contact. In order to detect the welding groove, the tilting range between the position where the contact portion of the detection rod comes into contact with the descending detection contact and the position where the contact portion of the detection rod comes into contact with the ascending detection contact while pressing the descending detection contact is set as the neutral range. It is the one.

[0017]

Therefore, in the copying detector of the present invention, when the groove contact end comes off the welding groove from the state where the welding groove is being detected, the contact portion of the detection rod is instantly released. Contacts the end detection contact, and this is detected.

According to the copying detector of the present invention, however, it is possible to instantly detect that the groove contact end has deviated from the end of the welding groove by simply increasing the number of detection contacts, and yet, The detection operation of the displacement in the upper direction, the lower direction, and other directions of the groove contact end during normal detection is not impaired. Moreover, by simply selecting the distance between the descending detection contact and the end detection contact, it is possible to easily set the tilt amount at the end detection with respect to the neutral range of the detection rod, that is, the allowable tilt range of the detection rod when performing normal detection. Can be set.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the scanning detector of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

Reference numeral 1 is a copy detector.

Reference numeral 2 denotes a casing of the scanning detector 1, which has a cylindrical shape with both upper and lower ends open, and has a diameter of a lower portion 2
a, the intermediate portion 2b, and the upper portion 2c are gradually increased in order.

Reference numeral 3 is a detection rod supported by the casing 2 so as to be tiltable. Each of the detection rods 3 is composed of a main part 4 and a detector 5 each having a substantially cylindrical shape and a coupling 6 connecting these, and the main part 4 has substantially the same length as the casing 2, and the detector 5 is The detector 5 is connected to the main portion 4 via a coupling 6 so as to extend from the lower end of the main portion 4 to the detector 5.
Is formed in a conical shape, and the tip 5a of this conical portion is the groove contact end.

Reference numeral 7 denotes a tilting piece that is tiltably supported at a position near the lower end of the casing 2, and the tilting piece 7 tiltably supports a part of the main portion 4 of the detection rod 3 near the lower end. There is. The tilting axis of the tilting piece 7 with respect to the casing 2 and the tilting axis of the detection rod 3 with respect to the tilting piece 7 are positioned so as to be orthogonal to each other. As a result, the detection rod 3 is positioned in the casing 2 from its substantially middle portion to the upper portion, and is supported by the casing 2 via the tilting piece 7 so as to be tiltable in all directions substantially orthogonal to its axial direction. It

The upper portion 4a of the main portion 4 of the detection rod 3 which is made of a material having partial conductivity above the portion supported by the tilting piece 7 serves as a contact portion.

Reference numeral 8 denotes a pressurizing cylinder holding two coil springs 9, 9 having a thick tube wall and a substantially cylindrical shape, and is housed in a substantially middle portion of the casing 2 and in the axial direction. It is rotatably arranged, and the main portion 4 of the detection rod 3 is inserted into the hole 8a with a margin around the axis. Two spring housing holes 8b, 8b penetrating the tube wall of the pressurizing cylinder 8 in the thickness direction are formed near the upper end of the tube wall. Are separated from each other by about 90 ° in the direction around the axis.

Numerals 10 and 10 are cylindrical pressure pieces whose one end is closed. When the coil springs 9 and 9 are stored, the closed ends of the compression springs 8b and 8b are the holes of the pressure cylinder 8. 8
The coil springs 9 and 9 are separately housed in a direction facing the a side, whereby one ends of the coil springs 9 and 9 are elastically contacted with the outer peripheral surface of the detection rod 3 with the closing wall of the pressure piece 10 and 10 interposed therebetween, and the other end is inside the casing 2. It is compressed by making elastic contact with the peripheral surface.

Since the pressing force of the coil springs 9, 9 is applied to a substantially intermediate portion between the portion of the detection rod 3 supported by the tilting piece 7 and the contact portion 4a, the detection rod 3 has the coil spring 9 applied thereto. The turning force in the direction of the combined force of the two pressing forces of 9 and 9 is urged.

Numeral 11 is a switching ring for switching the direction of the rotational power applied to the detection rod 3 by selectively switching the position of the pressurizing cylinder 8 in the axial direction, and is located on the intermediate portion 2b side of the lower portion 2a of the casing 2. In addition to being rotatably fitted to a biased position, it is coupled so as to rotate integrally with the pressure cylinder 8 by a coupling means (not shown), and is separately locked at three positions in the axial direction. And the three positions are spaced at a central angle of approximately 45 °.

Therefore, by switching the position of the switching ring 11, the direction of the rotational force applied to the detection rod 3 is three directions at a central angle of about 45 ° when the detection rod 3 is viewed from the axial direction. Can be selectively switched to any of the above.

Reference numeral 12 is a cap screwed onto the lower end of the casing 2 in an externally fitted shape.

Reference numeral 13 is a detector. The detection unit 13 has a cylindrical base member 14 with both ends open, a relatively thick disc-shaped contact substrate 15 fitted inside so as to close one end of the base member 14, and a base member 14. The connector 16 is fixed to the other end of the contact board and the six detection contacts 17, 18, 19, 19 ', 20 and 21 supported by the contact board 15, and the base member 14 is the contact board 15
The substantially half portion of the side is fixed to the casing 2 while being fitted and inserted in the upper end portion of the casing 2, and the lower surface 15a of the contact substrate 15 is relatively close to the upper end surface of the detection rod 3.

Of the six detection contacts, 17 is an up detection contact, 18 is a down detection contact, 19 and 19 'are end detection contacts, 20 is a left displacement detection contact, and 21 is a right displacement detection contact.

The descending detection contact 18 has a contact portion 22 formed in a substantially U shape by a wire having high rigidity and a coil spring-like 2
Two elastic parts 23, 23, and the elastic parts 23, 23
Is supported by the contact substrate 15 so as to penetrate therethrough in the thickness direction, and both end portions 22 of the contact portion 22 are formed at the lower ends of the elastic portions 23, 23 protruding downward from the contact substrate 15.
a and 22a are separately held.

Further, the detection contact 1 other than the descending detection contact 18
7, 19, 19 ', 20 and 21 are formed in a cylindrical shape and are supported by the contact substrate 15 so as to penetrate therethrough in the thickness direction.

Then, these six detection contacts 17, 1
8, 19, 19 ′, 20 and 21 are arranged in the following positional relationship (see FIG. 8).

That is, the left displacement detection contact 20 and the right displacement detection contact 21 are arranged on the opposite sides of the contact substrate 15 with the substantially central portion therebetween, and the ascending detection contact 17 and the two end detection contacts 19 and 19 'are left. Displacement detection contact 20 and right displacement detection contact 2
The contact substrate 15 is on a straight line orthogonal to the straight line connecting
Are separately arranged at two positions on the opposite side with the center part of the left end of the end detection contact 19 and 19 'separated from each other in the same direction as the arrangement direction of the left displacement detection contact 20 and the right displacement detection contact 21. It is arranged. Further, the elastic portions 23, 23 of the lowering detection contact 18 are separated from each other in the arrangement direction of the contacts 20, 21 and slightly closer to the end detection contacts 19, 19 'than the position where the rising detection contact 17 is sandwiched. Therefore, the contact portion 22 of the descending detection contact 18 is located in a direction extending in the same direction as the arrangement direction of the contacts 20 and 21 and closer to the end point detection contacts 19 and 19 'of the rise detection contact 17. Is located in.

The five detecting contacts 17, 19, 19 ', 20 and 21 other than the descending detecting contact 18 are made to have substantially the same protrusion amount from the lower surface 15a of the contact substrate 15, and the descending detecting contact 18 contacts. The middle portion of the portion 22 is located slightly below the lower ends of the other detection contacts 17, 19, 19 ', 20 and 21.

Therefore, the above six detection contacts 17, 1
8, 19, 19 ', 20 and 21 are contact portions 4 of the detection rod 3.
Arranged around the axis a, the descending detection contact 18 has spring elasticity in the arrangement direction of the ascending detection contact 17 and the end detection contacts 19 and 19 ', and is elastic when not pressed in this direction. The position is defined by the rigidity of 23, 23.

In a state where the descending detection contact 18 is not pressed, the position of the end detection contacts 19 and 19 'on the outer peripheral surface of the intermediate portion of the contact portion 22 and the position of the ascending detection contact 1
The axial distance w1 (see FIG. 5) between the detector 1 and the detector 7 in the axial direction has a size corresponding to the deflection amount of the groove contact end 5a selected in the range of approximately 0.05 mm to 0.3 mm. In addition, the gap w2 (see FIG. 6) between the contact portion 4a and the end detection contacts 19 and 19 'when the contact portion 4a of the detection rod 3 is in light contact with the intermediate portion of the contact portion 22 is a groove. The size of the contact end 5a substantially corresponds to a deflection amount of 2 mm.

Incidentally, these detection contacts 17, 18, 19, 1
9 ', 20 and 21 are electrically connected to a connector 16, and the connector 16 is further connected to a control circuit of an automatic copying welder described later.

FIG. 13 shows an example 24 of an automatic copying welder provided with the copying detector 1.

Reference numeral 25 is a first slide mechanism,
The slide mechanism 25 of the welding base metal 26, the welding groove 2 of 26
7 (in the case of butt welding shown in FIG. 13) is held by a feed mechanism (not shown) that is moved in the direction along the line 7 and in the left-right direction, that is, in the direction orthogonal to the welding groove 27. The movable part 28 is provided to be moved, and the movable part 28 is moved by a drive unit having a motor 29 as a drive source.

Reference numeral 30 denotes a second slide mechanism supported by the movable portion 28, which is a movable portion 31 which is vertically moved.
The movable part 31 is moved by a driving means using a motor 32 as a drive source, and one end of a bracket 33 extending horizontally is fixed to the movable part 31.

Reference numeral 34 is an adjustment block supported by the tip of the bracket 33, and 35 is a holder supported by the adjustment block 34. The adjustment block 34 is operated to adjust its left-right position. The adjusting block 34 is provided with a support shaft 38 extending in the vertical direction and having a knob 37 capable of finely adjusting the position in the vertical direction.
A bifurcated holder 35 is connected to the lower end of the support shaft 38 via a joint 39.

The copy detector 1 is detachably held by the holder 35, and the holding is performed by the holding hole 35a of the holder 35.
Insert the casing 2 of the copy detector 1 into the
This is done by tightening b.

The posture of the scanning detector 1 in the state of being held by the holder 35 is determined by the direction of the welding machine 24 (see FIG. 13).
(The direction indicated by the arrow in FIG. 3) is tilted forward by an appropriate angle.

A welding torch 40 is fixed to the bracket 3 at a position slightly behind the adjustment block 34 in a direction extending in the vertical direction.

After the scanning detector 1 is held on the holder 35, the knobs 36 and / or 37 are operated to position the groove contact end 5a of the detection rod 3 with respect to the welding torch 40 and the welding groove 27. Make adjustments.

Next, the operation of the copying detector 1 mounted on the welding machine 24 will be described as an example in which ambidextrous copying is used.

When the copying detector 1 is used for ambidextrous copying, the direction of the rotational force applied to the detection rod 3 by the coil springs 9 and 9 is such that the groove contact end 5a of the detection rod 3 is the welding groove 2
In the state where the contact portion 4a is not in contact with the terminal 7 (hereinafter, referred to as "no-load state"), the contact portion 4a is in the direction of contacting the two end detection contacts 19 and 19 'as shown in FIGS.

By setting the direction of the rotational force of the detection rod 3 in this way, the contact detector 4a of the detection rod 3 detects the unevenness of the welding groove 27 by the scanning detector 1 as shown in FIGS. As shown in FIGS. 7 and 10, the position where the contact portion 22 of the descending detection contact 18 is in contact with the descending detection contact 1
8 is performed while the tilting range between the contact position with the rising detection contact 17 while bending 8 is set as the neutral range, and the contact portion 4a is the end detection contact 19 from the state where the detection operation is performed,
When it contacts 19 ', the groove contact end 5a is welded groove 27
Is detected.

Such a detecting operation will be described according to the one-cycle welding operation shown in FIG.

In the initial state in which the welding torch 40 and the scanning detector 1 are in the position indicated by reference numeral A in the figure, since the groove contact end 5a is not in contact with the welding groove 27, the detection rod 3 The contact portion 4a is in contact with the end detection contacts 19 and 19 ', and in this state, the signal output from the detection portion 13 detects that the groove contact end 5a is not in contact with the welding groove 27. .

Then, when the welding torch 40 and the scanning detector 1 are lowered from this state to the position indicated by the symbol B and the groove contact end 5a comes into contact with the welding groove 27, the groove contact end 5a is relatively moved. And the detection rod 3 is tilted in the clockwise direction in the figure against the pressing force of the coil springs 9, 9, whereby the contact portion 4a is closed.
9 and 19 'are separated from each other, and substantially at the same time, the contact portion 4a comes into contact with the contact portion 22 of the descending detection contact 18 (FIGS. 6 and 9).
reference). In this state, the signal output from the detection unit 13 stops the lowering of the welding machine 24.

From this state, the welding machine 24 is moved in the feeding direction, and welding by the welding torch 40 is started.

The scanning detector 1 moved slightly ahead of the welding torch 40 detects fine irregularities of the welding groove 27.

That is, when the contact position of the groove contact end 5a is higher than the position of contact before that, the groove contact end 5a is pushed up and the detection rod 3 tilts clockwise. Then, when the displacement amount of the contact portion 4a due to this tilt reaches the interval w1, the contact portion 4a is moved to the up detection contact 17
And a predetermined signal is output. The welder 24 is raised according to this signal. Then, due to this rise, the detection rod 3 is tilted in the counterclockwise direction, and when the contact portion 4a is separated from the rise detection contact 17, the rise of the welding machine 24 is stopped according to the signal output thereby.

On the contrary, when the contact position of the groove contact end 5a is lower than the contact position before that, the detection rod 3 is tilted counterclockwise, Due to the tilting, the contact portion 4a moves to the contact portion 2 of the descending detection contact 18.
When separated from 2, the welding machine 24 is lowered according to the signal output thereby. When the detection rod 3 is tilted in the clockwise direction by this descending and the contact portion 4a comes into contact with the contact portion 22 of the descending detection contact 18, the descending of the welding machine 24 is stopped according to the signal output thereby.

Then, the welding groove 2 by the copying detector 1
The detection of the unevenness 7 is performed by detecting the position where the contact portion 4a of the detection rod 3 contacts the contact portion 22 of the descending detection contact 18 and the descending detection contact 18
The tilting range between the position in contact with the ascending detection contact 17 while flexing is performed as the neutral range, and the position of the welding torch 40 with respect to the welding groove 27 is controlled according to the detection result.

Then, as shown in FIG. 6C, when the groove contact end 5a comes off the welding groove 27, the detection rod 3 instantaneously moves.
That is, the contact portion 4a has the width w2, or at most the width w
Since the contact portion 4a comes into contact with the end detection contacts 19 and 19 'by being tilted in the counterclockwise direction within a time period in which the distance is increased by 1 (about 2.3 mm), the welding machine is generated by the signal output thereby. 24 is processed according to the predetermined processing contents when the end is detected such as being raised to the height in the initial state or moving only in the feeding direction as shown in FIG.

Since the interval w2 for detecting the end is set to be considerably larger than the interval w1 which is the neutral range at the time of normal detection, as long as there is no extreme concave step in the welding groove 27, it is a normal value. There is no fear that the contact portion 4a will come into contact with the end detection contacts 19 and 19 'during the detection, and the contact portion 4a will end.
Since the detection signal output when there is an extreme level difference such that the welding groove 27 comes into contact with the welding groove 27 means that there is a defect in the welding groove 27, there is no problem even if the operation is ended according to the detection signal. .

The detection of the unevenness of the welding groove 27 and the detection of the end by the scanning detector 1 are performed as described above.

The left and right shakes are corrected by using the left displacement detection contact 20 and the right displacement detection contact 21.

When the copying detector 1 is used in the form of left-handed copying, the contact portion 4a in the unloaded state has the left displacement detecting contact 20 and the end detecting contacts 19, 19 'as shown in FIG.
Of the right displacement detection contact 20 and the one closest to the left displacement detection contact 20, the contact portion 4a has no contact with the right displacement detection contact 2 as shown in FIG.
1 and the right displacement detection contact 2 among the end detection contacts 19 and 19 '
The direction of contact with the object 19 'close to 1 is set.

[0065]

As is apparent from the above description, the copying detector of the present invention has a groove contact end which comes into contact with a welding groove, and a substantially middle portion thereof is supported by the casing so as to be tiltable. The rod and the detection rod are arranged around the axis of a contact portion that forms the end portion on the side opposite to the groove contact end, and the tilting of the detection rod is detected by the contact of the contact portion, and at least above the groove contact end. A plurality of detection contacts including a rising detection contact for detecting displacement and a descending detection contact for detecting downward displacement of the groove contact end, and the groove contact end of the detection rod is elastically contacted with the welding groove. A copying detector equipped with an elastic means for urging a turning force in a direction to cause the end contact and rise detection contact for detecting that the groove contact end is out of the welding groove. And are placed on opposite sides of the contact point of the detection rod, and the descending detection contact is a spring. Has a flexible elastic portion and is arranged between the contact portion and the rising detection contact, and when the groove contact end is not in contact with the welding groove, the contact portion is brought into contact with the end detection contact, and the detection rod The welding range is detected by setting the tilting range between the position where the contact portion of the contact part contacts the down detection contact and the position where the contact part contacts the up detection contact while pressing the down detection contact as the neutral position. And

Therefore, in the copying detector of the present invention, when the groove contact end comes off the welding groove from the state where the welding groove is being detected, the contact portion of the detection rod is instantly released. Contacts the end detection contact, and this is detected.

According to the copying detector of the present invention, however, it is possible to instantly detect that the groove contact end has deviated from the end of the welding groove by simply increasing the number of detection contacts, and yet, The detection operation of the displacement in the upper direction, the lower direction, and other directions of the groove contact end during normal detection is not impaired. Moreover, by simply selecting the distance between the descending detection contact and the end detection contact, it is possible to easily set the tilt amount at the end detection with respect to the neutral range of the detection rod, that is, the allowable tilt range of the detection rod when performing normal detection. Can be set.

In the above-described embodiment, the descending detection contact is made to have spring elasticity by being supported in a bridging manner between the tip ends of the two coil springs. It may have an elastic structure.

Further, in the embodiment, two end detection contacts are provided, and the contact portion of the detection rod is brought into contact with these two end detection contacts in the initial state of ambidextrous use. By this, the posture of the detection rod in the initial state can be stably maintained.

However, in the present invention, the number of this end detection contact may be one.

In addition, the structure, shape, number, etc. of the detection rod and its contact portion, each detection contact, and each other portion shown in the embodiment are just one example of the embodiment in carrying out the present invention. However, the technical scope of the present invention should not be limitedly interpreted by these. And, needless to say, the welding machine which can use the present invention is not limited to the one shown in the embodiment.

[Brief description of drawings]

FIG. 1 is a central vertical cross-sectional view showing an example of an embodiment of a copying detector of the present invention.

FIG. 2 is an enlarged perspective view of a main part.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III in FIG.

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is an enlarged side view showing a part of the main part when the contact part of the detection rod comes into contact with the end detection contact when used in the ambidextrous copying mode.

FIG. 6 is an enlarged side view showing a part of the main part when the contact part of the detection rod comes into contact with the descending detection contact when used in the ambidextrous copying mode.

FIG. 7 is an enlarged side view showing a part of a main part when a contact portion of a detection rod comes into contact with an ascending detection contact when used in a ambidextrous copying mode.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX of FIG.

FIG. 11 is a diagram showing the positional relationship between the contact portion of the detection rod and the detection contact in the initial state when used in the left-handed copying mode.

FIG. 12 is a diagram showing the positional relationship between the contact portion of the detection rod and the detection contact in the initial state when used in the form of right-handed copying.

FIG. 13 is a perspective view showing an example of an automatic copying welder provided with the copying detector shown in FIGS. 1 to 12.

FIG. 14 is an operation explanatory view showing a one-cycle welding operation by the automatic profile welding machine.

FIG. 15 is a schematic sectional view showing an example of a conventional copy detector.

[Explanation of symbols]

 1 Copying Detector 2 Casing 3 Detection Rod 4a Contact Point 5a Groove Contact End 9 Repulsion Means 17 Detection Contact (Rise Detection Contact) 18 Detection Contact (Descent Detection Contact) 19, 19 'Detection Contact (End Detection Contact) 20 Detection Contact 21 Detection contact 23 Elastic part 27 Weld groove

Claims (1)

[Claims] 1. A detection rod having a groove contact end which comes into contact with a weld groove and a substantially middle portion of which is supported by a casing so as to be tiltable, and an end portion of the detection rod on the side opposite to the groove contact end. Arranged around the axis of the contact portion, the contact of the contact portion detects the tilting of the detection rod and at least the rising detection contact for detecting the upward displacement of the groove contact end and the downward contact of the groove contact end. A plurality of detection contacts including a descending detection contact for detecting displacement,
A scanning detector comprising a detection rod and an elastic means for urging a rotational force in a direction to elastically contact the groove contact end with the welding groove, wherein the groove contact end is away from the welding groove. An end detecting contact and an ascending detecting contact for detecting the disengagement are arranged on substantially opposite sides of the contact part of the detecting rod, and the descending detecting contact has an elastic part having spring elasticity and the contact part. It is placed between the rising detection contact and the position where the groove contact end contacts the end detection contact when the groove contact end is not in contact with the welding groove and the contact part of the detection rod contacts the descending detection contact. A scanning detector, wherein a welding groove is detected while a tilting range between a position in contact with an ascending detection contact while pressing the descending detection contact is set as a neutral position.