JPH08323476A - Profiling detector - Google Patents

Abstract

PURPOSE: To provide a profiling detector which is small in size, easy for assembling/adjusting and also capable of detecting with high precision. CONSTITUTION: In a hollow frame 1, a hollow slider 2 is arranged, which is freely slidable in the direction orthogonally crossing the surface of a work, and then energized downward by a compression spring 4. A long detecting rod 5 is supported in a freely tiltable manner by a supporting pin 7 which is attached to the lower end of the slider and which is parallel to the advancing direction for profiling; and then, a sector gear 8 formed around the axial center of a supporting pin and an abutting tool 6 for profiling are attached to the upper and lower end of the detecting rod. A pinion gear 9 meshed with the sector gear is attached freely rotatably to the upper part of the slider with a first bevel gear 11 attached coaxially with the pinion gear; and then, meshed with the first bevel gear, a second bevel gear 12 with a diameter smaller than that of the first bevel gear is attached freely rotatably to the upper part of the slider. The second bevel gear is connected to the detection shaft of a rotary detector 13, and simultaneously a vertical position detector 14 for detecting vertical deviation of the slider is attached to the frame, so that the detector is realized for profiling in two directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying detecting device used in an automatic welding machine with a welding line copying device.

[0002]

2. Description of the Related Art Generally, in an automatic welding machine equipped with a welding line copying device, a copying abutment device, for example, a detector provided with a roller at the tip is arranged in front of a welding torch, and the welding line is traced by this roller. Meanwhile, the condition of the welding line is detected by a detector, and the horizontal movement device and the vertical movement device are appropriately driven by this detection signal to perform automatic welding.

Conventionally, for example, an apparatus shown in FIGS. 10 to 13 has been proposed. That is, 61 is a hollow frame body that opens in a direction orthogonal to the work surface, for example, the Z direction, 6
2 is slidably disposed within the opening direction of the hollow frame member 61, the axial core portion in the hollow of the slider, for example, as shown in FIG. 13, the end portion of the Z ₁ direction of the slider 62,
Two fork portions 621 and 621 facing each other in the X direction are formed, and the protrusion 631 of the rotation stopping member 63 attached to the frame 61 is loosely inserted between the two fork portions 621 and 621, so that the slider 62 moves in the Z direction. It is slidable only in the direction.

Reference numeral 64 is an urging means for urging the slider 62 in the Z ₁ direction with respect to the frame body 61, for example, a compression spring, and 65 is loosely inserted in the hollow portion of the slider 62 to make the slider 62
A long-axis detection rod which is tiltably attached to the lower end of the detection rod via a support pin 67, 66 is a copying contactor attached to the lower end of the detection rod, and 68 is integrally attached to the upper end of the detection rod 65. The bracket 68 supports the first and second microswitches 69 and 70 on the bracket 68.

71 and 72 are first and second strikers screwed to the upper end of the slider 62 so as to face the first and second micro switches 69 and 70, respectively, and 73 and 74 are third. The fourth and third microswitches 75 and 76 are third and fourth strikers, and the components 73 to 76 are attached to the frame 61 and the slider 62, respectively.

The above-mentioned 61 to 76 constitute a conventional copying detection device 80. Incidentally, 81 is the detection device 8
0 holding member.

In the above, the holding member 81 and the workpiece W are relatively moved in the Z direction, and the copying contact member 66 is moved to the groove portion of the workpiece W, that is, as shown in FIG. The detection operation of the welding line is performed by abutting on the corner portion, and in this state, the copying detection device 80 and the workpiece W are relatively moved in the X direction.

Of course, prior to the detection work, the first to fourth
The strikers 71, 72, 75, 76 are appropriately positioned so that the projection margins thereof are in a desired state.

By the way, for example, if the position of the welding line deviates in the Y ₁ direction during the detection work, the urging means 64 causes Z ₁ to move.
The support pin 6 is attached to the slider 62 which is biased in the direction.
Since the detection rod 65 is supported via the pin 7, the detection rod 65 tilts clockwise in FIG. 11 about the support pin 67. In this case, the detection rod 6 with a desired set angle or more
When 5 is tilted, the first striker 71 activates the first micro switch 69 to output a detection signal.

Of course, when the welding line is displaced in the Y ₂ direction by more than a desired set amount, the second striker 72 operates the second micro switch 70 to output a detection signal.

On the other hand, if the welding line is displaced in the Z ₁ direction or the Z ₂ direction by a desired set amount or more, the third or fourth position is generated.
The detection signal is output by the micro switch 73 or 74.

[0012]

However, since it is necessary to finely set the protrusion allowance of the strikers 71, 72, 75, and 76 prior to the detection work, it takes a long time for the adjustment work.

Further, the micro switch has a so-called insensitive pushing margin in which the device does not operate when the detection lever is initially pushed, and the insensitive pushing margin varies depending on each micro switch. Variations in detection capability were unavoidable, resulting in poor detection accuracy.

Furthermore, with the selection of the material and welding method of the object to be welded, in particular, the width of the positional displacement of the welding line in the left-right direction is reduced, that is, the detection state is set with high accuracy, or welding is performed. The width of the positional displacement of the line is made relatively large, that is, the detection state is not so accurate, but it is necessary to appropriately set the protrusion allowance of the striker each time the detection accuracy is changed. However, the workability was poor.

Further, since the micro switch and the striker are used as a pair, the device cannot be downsized.

The present invention has been made in view of the above problems, and an object thereof is to provide a copying detection device which is small in size, can be easily assembled and adjusted, and can perform highly accurate detection. That is.

[0017]

The first aspect of the present invention is applied to a copying detection device having a copying contacting tool at the tip and for detecting the deviation of the contacting tool. The feature is that a hollow frame body that opens in a direction orthogonal to the work surface and a support pin that is inserted into the hollow portion of the frame body and is parallel to the traveling direction following the lower end portion of the frame body. A long-axis detection rod that is tiltably attached via a biasing means that biases the detection rod in a tilting manner with the support pin as a center, and a copying abutment tool that is attached to the lower end of the detection rod. A fan-shaped gear that is attached to the upper end of the detection rod and is formed around the axis of the support pin, a pinion gear that meshes with the fan-shaped gear and is rotatably attached to the top of the frame, and a pinion gear. That is, the rotation detector connected to the detection shaft is provided.

In addition to the first aspect of the present invention, the second aspect of the present invention includes
The pinion gear that meshes with the fan-shaped gear and a bevel gear, which is a pair with a reduced number of teeth, are provided between the rotation detector and the rotation detector.

The third aspect of the present invention is applied to a copying detection device having a copying contacting tool at the tip and for detecting the deviation of the corresponding contacting tool. The feature is that a hollow frame body that opens in a direction orthogonal to the work surface, a slider with a hollow shaft portion that is slidably arranged in the opening direction of the hollow frame body, and the frame body. Urging means for urging the slider downward with respect to the main shaft of the long shaft that is loosely inserted into the hollow part of the slider and tiltably attached to the lower end of the slider via a support pin parallel to the traveling direction. A detection rod, a copying abutment tool attached to the lower end of the detection rod, a fan-shaped gear attached to the upper end of the detection rod and formed around the axis of the support pin, and meshed with the fan-shaped gear. A pinion gear rotatably attached to the upper part of the slider, a rotation detector in which a detection shaft is connected to the pinion gear, and a vertical position detector for detecting the vertical displacement of the slider. Is.

In addition to the third invention, the fourth invention is,
It is characterized in that an urging means for urging the detection rod in a tilting manner is provided around the support pin.

The fifth aspect of the present invention is, in addition to the third aspect of the present invention,
The pinion gear that meshes with the fan-shaped gear and a bevel gear, which is a pair with a reduced number of teeth, are provided between the rotation detector and the rotation detector.

In addition to the fifth invention, the sixth invention is,
It is characterized in that an urging means for urging the detection rod in a tilting manner is provided around the support pin.

[0023]

The fan-shaped gear formed around the axis of the support pin is provided at the upper end of the detection rod that is tiltably attached by the support pin parallel to the scanning direction.
When the copying contacting tool that contacts the workpiece is displaced in the left-right direction orthogonal to the copying traveling direction, the detection rod and the fan-shaped gear tilt around the support pin. In this case, the pinion gear that meshes with the fan-shaped gear is amplified to a rotation angle larger than the tilting angle of the fan-shaped gear and rotated. For this reason,
Even a minute positional displacement of the work can be detected by a rotation detector as a large rotation angle that is an amplification thereof.

Since the tilt angle of the detection rod is amplified to a large rotation angle with respect to the detector for rotation, the fan-shaped gear and the pinion gear may have a low manufacturing accuracy, and therefore the manufacturing cost is low. It will be cheaper.

Furthermore, since the tilt angle of the detection rod is amplified to a large rotation angle with respect to the rotation detector, it is easy to assemble without paying much attention to the assembly accuracy of the copying detection device. You can work.

Furthermore, since the detection in the left-right direction, which is orthogonal to the scanning direction, can be detected by a single detector, the scanning detection device can be downsized.

Further, by appropriately adjusting the dead zone of the scanning control device with respect to the displacement detection amount of the detector in the left-right direction, it is possible to deal with the change of the tilting angle of the detection rod, that is, the detection accuracy of the welding line.

As described above, it is possible to realize a copying detecting device which is small in size, easy to assemble and adjust, and capable of highly accurate detection.

Further, if a bevel gear paired with a pinion gear that meshes with a fan-shaped gear and a rotating detector is provided so as to reduce the number of teeth, the tilt angle of the detection rod can be changed to the rotating detector. On the other hand, since it is further amplified, it is particularly effective.

Furthermore, a support pin for tiltably supporting a detection rod having the fan-shaped gear at the upper end is attached to a slider that slides in a direction orthogonal to the surface of the work, and the displacement of this slider is detected. If the vertical position detector is provided, it is possible to realize a small-sized two-way copying detection device which is easy to assemble and adjust and can perform highly accurate detection.

[0031]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. First, in FIGS. 1 to 5 showing a first embodiment of the present invention, 1 is a direction orthogonal to the work surface, for example, Z
2 is a hollow frame body 2 that is slidably disposed in the opening direction of the hollow frame body 1 and has a hollow shaft center portion. For example, as shown in FIG.
Two fork portions 201, 20 facing each other in the X direction are provided at _one end.
1 is formed. 3 is a detent member mounted to the end of the Z ₁ direction of the frame 1, Z ₂ of the detent member 3
The protrusion 301 in the direction is loosely inserted between the two forks 201, 201, and the slider 2 is constrained to be slidable only in the Z direction.

Reference numeral 4 is a first urging means for urging the slider 2 in the Z ₁ direction with respect to the frame body 1, for example a compression spring, 5 is loosely inserted in the hollow portion of the slider 2, and the lower end portion of the slider 2 A long-axis detection rod is tiltably attached to the detection rod 5 via a support pin 7, and 6 is a rotatable copying contactor attached to the lower end of the detection rod 5. The support pin 7 attached to the lower end of the slider 2 is arranged in parallel with the scanning direction, that is, the X direction.

Reference numeral 8 denotes a fan-shaped gear attached to the upper end of the detection rod 5, and this fan-shaped gear 8 is, as shown in FIG.
The support pin 7 is formed in an arc shape around the axis O ₁ of the support pin 7. Reference numeral 9 denotes a pinion gear that meshes with the fan-shaped gear 8. The pinion gear 9 is rotatably supported on the slider 2. Reference numeral 11 is a first bevel gear fixed so as to be coaxial with the pinion gear 9, and 12 is a first bevel gear 11
The second bevel gear 12 meshes with the second bevel gear 12, and the second bevel gear 12 has a smaller diameter than the first bevel gear 11. Thirteen
Is a rotary detector, for example, a rotary potentiometer, and the detection shaft of the detector 13 is connected to the second bevel gear 12.

Reference numeral 14 denotes a detector in the vertical direction, that is, the Z direction, for example, a direct acting potentiometer.
The four detection shafts are connected to the slider 2 via the bracket 15. Reference numerals 16 and 16 denote second biasing means, for example, compression springs, which are arranged so that the two compression springs 16 and 16 sandwich the detection rod 5.

According to the above 1 to 16, the copying detection device 2
0 is configured. The copying detection device 20 is held by a holding member 81 and attached appropriately. For example, the holding member 81 is attached to a welding traveling carriage (not shown).

In the above, the holding member 81 and the work piece W are relatively moved in the Z direction and the Y direction so that the copying abutment tool 6 is moved to the work piece W as shown in FIG.
The groove portion, that is, the corner portion. In this case, as shown in FIG. 2, the detection rod 5 supported by the support pin 7 does not tilt in any direction and stands upright in the vertical direction, that is, the Z direction.

Further, in the above case, as shown in FIGS. 1 and 2, the slider 2 biased in the Z ₁ direction by the first biasing means 4 is desired in the Z ₁ direction and the Z ₂ direction. It is assumed that they are arranged so that they can be moved in the Z direction with a margin for each detected amount.

In the above-mentioned arrangement, the copying detection device 20 and the object to be welded W are relatively moved in the X direction to perform the welding line detection work.

By the way, at the time of detection work, for example, when the groove portion of the workpiece W is displaced by a small amount in the Y ₂ direction from the state shown in FIG. 2, the copying contact tool 6 and the detection rod 5 are supported by the support pins. Tilt counterclockwise around 7.

This tilting condition will be schematically described with reference to FIG. In FIG. 6, O _{1 is} the axis of the support pin 7, Δθ is the tilt angle of the detection rod 5 and the fan-shaped gear 8 about the axis O ₁ , R _{1 is the} radius of the pitch circle of the fan-shaped gear 8, O ₂ ; the axis of the pinion gear 9, R ₂ : the radius of the pitch circle of the pinion gear 9, Z ₁ : the number of teeth of the first bevel gear 11, Z ₂ : the number of teeth of the second bevel gear 12, and the pinion gear 9 The rotation angle θ _G and the rotation angle θ _K of the second bevel gear 12 are respectively expressed by the following equations.

R ₁ · Δθ = R ₂ · θ _G (1)

Z ₁ · θ _G = Z ₂ · θ _K (2)

From the above equations (1) and (2), the following equation holds.

Θ _K = (Z ₁ / Z ₂ ) · (R ₁ / R ₂ ) · Δθ (3)

As an actual numerical value, for example, R ₁ = 130
When mm, R ₂ = 16 mm, Z ₁ = 40 and Z ₂ = 20 are selected, the above equation (3) is expressed as follows.

Θ _K = (40/20) × (130/16) · Δθ = 16.3 · Δθ (4)

That is, when the detection rod 5 tilts by Δθ, this tilting angle is amplified about 16 times and detected by the rotation detector 13.

By the way, in the conventional apparatus, for example, FIG.
As shown in FIG.
If the distance between the abutting position and the support pin 67 is H ₁ , and the distance between the support pin 67 and the strikers 71 and 72 is H ₂ , then at most (H ₂ / H ₁ ) = 2. That is, in the conventional device, the tilt angle Δθ must be detected in a state in which the tilt angle Δθ of the detection rod 65 is approximately doubled. Therefore, it is difficult to detect a fine tilt angle Δθ. It was

However, in the present invention, the fan-shaped gear, the pinion gear, the first bevel gear, and the second bevel gear as described above amplify the tilt angle of the detection rod to a large rotation angle, which is greatly amplified. Since the detected rotation angle is detected by the detector, even a minute lateral displacement of the work can be easily and surely detected by the rotation detector.

Of course, since the tilt angle of the detection rod is amplified to a large rotation angle with respect to the detector for rotation, each of the fan-shaped gear, the pinion gear and the bevel gear may have a low manufacturing precision, Therefore, the manufacturing cost is low.

Further, since the tilt angle of the detection rod is amplified to a large rotation angle with respect to the rotating detector, the assembling work can be performed easily without paying much attention to the assembling accuracy of the copying detector. Can be done.

Furthermore, since the detection in the left-right direction orthogonal to the scanning traveling direction can be detected by a single detector, the scanning detection device can be downsized.

Of course, as shown in FIG. 1 and FIG.
A slider 2 that supports the detection rod 5 via a support pin 7.
Is urged in the Z ₁ direction by the _first urging means 4 and is movably arranged in the Z ₁ and Z ₂ directions.
For example, if the surface of the work W is displaced in the Z direction from the state shown in FIG. 2, the slider 2 follows and the amount of this displacement is detected by the vertical detector 14.

As described above, the detectors 13 and 14 perform desired detection in the horizontal direction and the vertical direction.

Further, by appropriately adjusting the dead zone of the scanning control device with respect to the displacement detection amount of the detector in the left and right direction, it is possible to deal with the change of the tilt angle of the detection rod, that is, the detection accuracy of the welding line.

For example, as described above, the tilt angle Δθ of the detection rod 5 is detected by the left and right detectors 13 as a detection angle of 16 · Δθ, so the control angle of the detection rod 5, that is, the tilt control minimum. For example, half the angle (= Δθ / 2)
When changing to, the detection angle of the detector 13 is 8 · Δθ
With the above operation of the control device, the detected angle is 8
By setting the so-called dead zone control in which the control device is not operated when the angle is less than Δθ, it is possible to deal with the change in the tilt angle of the detection rod, that is, the detection accuracy of the welding line.

As described above, according to the present invention, it is possible to realize a small-sized two-direction copying detection device which is easy to assemble and adjust and can perform highly accurate detection.

Of course, if a pair of bevel gears having a reduced number of teeth are arranged between the pinion gear meshing with the fan-shaped gear and the rotation detector, the tilt angle of the detection rod is detected by the rotation detector. It is particularly effective because it is greatly amplified.

Notwithstanding the above, the pair of bevel gears can be omitted. That is, the detection shaft of the rotation detector can be connected to the pinion gear that meshes with the fan-shaped gear. In this case, the tilt angle Δθ of the detection rod 5 and the rotation angle θG of the pinion gear 9 have the relationship of the above equation (1),
If the above-mentioned numerical values R ₁ = 130 mm and R ₂ = 16 mm are selected, the above equation (1) is expressed as follows. θ _G = (R ₁ / R ₂ ) · Δθ = (130/16) · Δθ = 8.13 Δθ (5) Thus, for example, detection for rotation of a pinion gear meshing with a fan-shaped gear When the detection shafts of the detectors are connected, the situation is such that the detector 13 side is amplified about four times as compared with the above-mentioned conventional device.

As shown in FIGS. 1 and 2,
By disposing the first and second biasing means 4 and 16,
The slider 2 is biased in the Z ₁ direction by the first biasing means 4, and the detection rod 5 tiltably supported by the support pin 7 is kept in the neutral position by the second biasing means 16. To do. Therefore, the copying biasing abutment tool 6 is surely displaced in the vertical direction by the first biasing means 4, and the copying biasing abutment tool 6 is surely tilted in the horizontal direction by the second biasing means 16. At the same time, reliable detection is performed.

By the way, the detection rod 5 tilts about the support pin 7 while the copying contacting tool 6 contacts the groove of the workpiece W. That is, when the groove of the workpiece W is displaced in the Y direction from the state shown in FIG. 2, the detection rod 5 tilts about the support pin. The slider 2 biased in the Z ₁ direction by 4 is displaced in the Z ₁ direction to some extent, and the center position of the support pin 7 is also displaced in the Z ₁ direction. In this case, the detection rod 5
The distance between the surface of the work piece W and the center of the support pin 7 before tilting is defined as H ₁ , and the distance between the surface of the work piece W and the center of the support pin 7 when the detection rod 5 tilts by Δθ. H
_{If 1} -ΔH ₁ , it can be roughly expressed as follows.

ΔH ₁ = H ₁ (1-COS Δθ) (6)

Although it cannot be unequivocally affirmed by the size of each part, for example, when H ₁ = 80 mm and Δθ = 5 °, ΔH
₁ = 80 × (1-COS 5 °) = 0.32 mm, and the amount of displacement of the support pin 7 in the Z direction before and after the tilting of the detection rod 5 is a negligible amount.

By the way, during the detection work, when the detection rod 5 is tilted about the support pin 7 by a predetermined tilt angle Δθ or more, the tilt state is detected by the detector 13, and the Y of the groove is detected.
The detection device 20 is controlled so as to move in the position displacement direction. That is, since the position of the detection device 20 is rapidly controlled by the detection signal and the tilted state of the detection rod 5 is eliminated, the fine displacement amount of the support pin 7 in the Z direction before and after the tilting of the detection rod 5 is performed. Can be substantially ignored in the actual detection work.

In particular, in FIG. 2, the second biasing means 16 and 16 can be omitted. That is, even if the second biasing means 16 and 16 are omitted, the slider 2 to which the detection rod 5 is attached via the support pin 7 is biased in the Z ₁ direction by the first biasing means 4. Therefore, if the groove portion of the workpiece W is displaced in the Y direction from the state shown in FIG. 2, the detection rod 5 urged in the Z ₁ direction via the support pin 7 will contact the copying contact. The tool 6 tilts while contacting the groove portion of the workpiece W.

FIGS. 7 to 9 are views showing a second embodiment of the present invention and are applied to the case where the horizontal direction of the workpiece W, that is, the Y direction is detected. In this case, the hollow slider 2 and the hollow frame 1 shown in FIGS. 1 to 4 are integrally formed.

That is, at the end of the hollow frame 1 in the Z ₁ direction, two fork portions 101, 101 facing each other in the X direction are formed, and the two fork portions 101, 101 and the hollow portion of the frame body 1 are formed. The detection rod 5 is inserted through the support rod 7, and the detection rod 5 is tiltably supported by the support pins 7 attached to the forked portions 101, 101.

Reference numeral 21 is a protective cover, which covers the above-mentioned two-forked portions 101, 101. Attaching the copying contacting tool 6 to the detection rod 5, attaching a fan-shaped gear 8 formed around the support pin 7 to the upper end of the detection rod 5, engaging the pinion gear 9 with the fan-shaped gear 8, and detecting Stick 5
The provision of the biasing means 16, 16 for tilting is similar to that of the first embodiment. In the illustrated case, the detection shaft of the detector 13 is connected to the pinion gear 9.

The above-mentioned 1, 5, 6, 7, 8, 9, and 13 constitute a copying detection device 30.

The operation of the copying detection device 30 is the same as the left / right detection work described in the first embodiment, and therefore its explanation is omitted.

In the above, the rotation angle θ _G of the pinion gear 9 with respect to the tilt angle Δθ of the detection rod 5 is almost the same as the value expressed by the above equation (5). That is, in the first embodiment, as already described, the central position of the support pins 7 when the detection rod 5 and tilting △ in H ₁ represented trace amount corresponding to positional displacement in the Z ₁ direction. On the other hand, in the second embodiment, the center position of the support pin 7 is fixed in the Z direction. Therefore, when the groove of the work piece is displaced in the Y direction, the second embodiment slightly detects the tilt angle of the detection rod 5 in the first embodiment. The tilt angle of the rod 5 becomes smaller. But,
Since the difference between the tilt angles is very small, they can be regarded as substantially the same.

Of course, in the second embodiment, as in the case shown in FIGS. 1 and 5, between the pinion gear 9 and the detector 13, the first and second pairs having a reduced number of teeth are formed.
If a bevel gear is provided, the tilt angle of the detection rod 5 can be detected while being greatly amplified.

In the first and second embodiments, if a rotation detector such as a rotary potentiometer or a rotary encoder is used as the detector in the left-right direction, the assembly is easy and the mounting space is small. be able to.

In spite of this, a direct acting type detector such as a direct acting type potentiometer or a differential transformer can be used as the left and right detectors. In this case, since the rotation state for detecting the pinion gear that meshes with the fan-shaped gear, and further the bevel gear attached to the pinion gear, must be appropriately converted into a linear state by the gear and the rack, the rotation detector The mechanism is slightly more complicated than the case.

Furthermore, if a direct acting type detector such as a direct acting type potentiometer or a differential transformer is used as the vertical detector, the structure becomes simple. Despite this, the vertical displacement is converted to a rotation angle by the rack and gear,
The rotation angle can be detected by a rotation detector such as a rotary potentiometer or a rotary encoder.

[0076]

As is apparent from the above description, in the copying detecting device according to the present invention, the shaft of the support pin is attached to the upper end of the detection rod which is tiltably attached by the support pin parallel to the copying traveling direction. Since the fan-shaped gear that is formed around the core is provided, when the copying contact tool that contacts the workpiece is displaced in the left-right direction orthogonal to the copying traveling direction, the detection rod and the fan-shaped centering around the support pin are performed. Gears tilt. In this case, the pinion gear that meshes with the fan-shaped gear is amplified to a rotation angle larger than the tilting angle of the fan-shaped gear and rotated. Therefore, even a minute positional displacement of the work can be detected as a large rotation angle by amplifying the displacement by the rotation detector.

Since the tilt angle of the detection rod is amplified to a large rotation angle with respect to the detector for rotation, the fan-shaped gear and the pinion gear may have a low manufacturing accuracy, and therefore the manufacturing cost is low. It will be cheaper.

Furthermore, since the tilt angle of the detection rod is amplified to a large rotation angle with respect to the rotation detector, it is easy to assemble without paying much attention to the assembly accuracy of the copying detection device. You can work.

Furthermore, since the detection in the left-right direction, which is orthogonal to the scanning direction, can be detected by a single detector, the scanning detection device can be downsized.

Further, by appropriately adjusting the dead zone of the scanning control device with respect to the displacement detection amount of the detector in the left-right direction, it is possible to deal with the change of the tilt angle of the detection rod, that is, the detection accuracy of the welding line.

As described above, it is possible to realize a copying detection device which is small in size, easy to assemble and adjust, and capable of highly accurate detection.

Further, by disposing a bevel gear paired with a pinion gear meshing with the fan-shaped gear and the rotating detector, the pair of bevel gears having a reduced number of teeth, the tilt angle of the detection rod is detected by the rotating detector. Is particularly effective because it is further amplified.

Furthermore, a support pin for tiltably supporting a detection rod having the fan-shaped gear at the upper end is attached to a slider that slides in the direction orthogonal to the surface of the work, and the displacement of this slider is detected. If the vertical position detector is provided, it is possible to realize a small-sized two-way copying detection device which is easy to assemble and adjust and can perform highly accurate detection.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially sectional front view of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

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

5 is a sectional front view showing an enlarged main part in FIG. 1. FIG.

FIG. 6 is a schematic explanatory view for explaining a tilting state of the first embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 8 is a partial sectional front view of FIG.

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

FIG. 10 is a vertical sectional view showing a conventional example.

11 is a sectional front view of FIG.

FIG. 12 is a sectional view taken along line XII-XII in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 hollow frame, 2 hollow slider, 4 1st urging means, 5 detection rod, 6 contacting tool for copying, 7 support pin 8 fan-shaped gear, 9 pinion gear, 11 1st bevel gear, 12 1st 2 bevel gears, 13 rotation detectors, 14 up and down detectors, 16 first biasing means, 20, 30 copying detection device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshihiko Adachi 2-11-1, Tagawa, Yodogawa-ku, Osaka

Claims (6)

[Claims] 1. A copying detection device having a copying contacting tool at its tip, for detecting the deviation of the contacting tool, wherein a hollow frame body opening in a direction orthogonal to the surface of the work, and the frame. A long-axis detection rod that is inserted into the hollow portion of the body and is tiltably attached to the lower end of the frame through a support pin that is parallel to the traveling direction, and a detection rod centered on the support pin. A biasing means for tiltingly biasing, a copying abutment tool attached to the lower end of the detection rod, and a fan-shaped gear attached to the upper end of the detection rod and formed around the axis of the support pin. And a pinion gear that is rotatably attached to the upper portion of the frame body by meshing with a fan-shaped gear, and a rotation detector in which a detection shaft is connected to the pinion gear. 2. A copying detection device having a copying contacting tool at its tip, for detecting the deviation of the contacting tool, wherein a hollow frame body opening in a direction orthogonal to the surface of the work, and the frame. A long-axis detection rod that is inserted into the hollow portion of the body and is tiltably attached to the lower end of the frame through a support pin that is parallel to the traveling direction, and a detection rod centered on the support pin. A biasing means for tiltingly biasing, a copying abutment tool attached to the lower end of the detection rod, and a fan-shaped gear attached to the upper end of the detection rod and formed around the axis of the support pin. A pinion gear rotatably attached to the upper part of the frame body by meshing with a fan-shaped gear, a first bevel gear supported coaxially with the pinion gear, and the frame body meshing with the first bevel gear. A second bevel rotatably mounted on the upper part of the wheel and having a diameter smaller than that of the first bevel gear. A copying detection device comprising a gear and a rotation detector in which a detection shaft is connected to a second bevel gear. 3. A copying detection device having a copying contacting tool at its tip, for detecting the deviation of the contacting tool, wherein a hollow frame body opening in a direction orthogonal to the surface of the work, and a hollow frame A slider having a hollow shaft center portion that is slidably arranged in the opening direction of the frame body, a biasing means that biases the slider downward with respect to the frame body, and a slider that is loosely inserted into the hollow portion of the slider. ,
A long axis detection rod that is tiltably attached to the lower end of the slider via a support pin that is parallel to the moving direction of the slider, a copying abutment tool that is attached to the lower end of the detection rod, and an upper end of the detection rod. And a fan-shaped gear formed around the axis of the support pin, a pinion gear that meshes with the fan-shaped gear and is rotatably attached to the upper part of the slider, and a detection shaft connected to the pinion gear for rotation. And a vertical position detector that detects the vertical displacement of the slider. 4. The copying detection device according to claim 3, further comprising biasing means for tiltingly biasing the detection rod about the support pin. 5. A copying detection device having a copying contacting tool at its tip, for detecting the deviation of the contacting tool, wherein a hollow frame body opening in a direction orthogonal to the surface of the work and a hollow frame A slider having a hollow shaft center portion that is slidably arranged in the opening direction of the frame body, a biasing means that biases the slider downward with respect to the frame body, and a slider that is loosely inserted into the hollow portion of the slider. ,
A long axis detection rod that is tiltably attached to the lower end of the slider via a support pin that is parallel to the moving direction of the slider, a copying abutment tool that is attached to the lower end of the detection rod, and an upper end of the detection rod. And a fan-shaped gear formed around the axis of the support pin, a pinion gear meshing with the fan-shaped gear and rotatably attached to the upper portion of the slider, and a first pinion supported coaxially with the pinion gear. A detection shaft is connected to a second bevel gear and a second bevel gear having a smaller diameter than the first bevel gear, which is rotatably attached to the upper portion of the slider by meshing with the bevel gear and the first bevel gear. Detecting device for scanning, which comprises a detector for rotation and a vertical position detector for detecting vertical displacement of the slider. 6. The copying detection device according to claim 5, further comprising biasing means for tiltably biasing the detection rod about the support pin.