JPH0123672Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a workpiece position holding device for welding a workpiece, that is, a mounting ring, to the cap of a shock absorber used in an automobile, for example.

For example, when welding a workpiece (mounting ring) to the cap of a shock absorber used in an automobile, as shown in FIG. The workpiece 4 placed on top is rotated, a slit formed in the radial direction of the workpiece 4 is detected by a sensor 6 attached to the base 5, and the workpiece 4 is transferred to a chuck (not shown) provided on the loader. ),
The locking member 9 is moved to the shaft portion 8 of the tubular workpiece support member 7 shown in FIG. and is biased by the spring 11 to engage the shaft portion 8.
After fixing the workpiece 4 to the workpiece 4, the cap is pressed to one side of the workpiece 4 via one electrode, and the other electrode is pressed to the other side of the workpiece 4, and the workpiece 4 is welded to the cap. There is. In addition,
In FIG. 2, 12 is a notched groove, and 13 is a fulcrum.

However, in the conventional workpiece position holding device as described above, since there is variation in the size of the inner diameter of the workpiece 4, if the inner diameter of the workpiece 4 is too large relative to the shaft 3 of the rotating body 2, the workpiece 4 does not rotate as desired, making it difficult for the sensor 6 to detect the slit, which may impede the next welding process.

In view of the above-mentioned circumstances, this invention includes a support stand provided on the base to support the workpiece, and a position fixing unit that is fixed in position adjacent to the support stand and rotatably connected to a drive source. a roller, a movable body that is provided so as to be able to approach and separate from the support base and that holds the work fitted to the support base between the roller and the position fixed roller; The sensor is arranged close to and separated from the workpiece, detects the slit provided in the workpiece, and uses the detection signal to stop the drive source. Even if the inner diameter of the workpiece is uneven, the slit can be easily removed. It is an object of the present invention to provide a workpiece position holding device that can detect and thereby ensure the next process of welding work.

An embodiment of this invention will be described below with reference to FIGS. 3 to 8. Reference numeral 21 in FIG. 3 is a base, and on one side of this base 21 there is a parts feeder 22.
A workpiece (mounting ring) 24 to be welded to a cap 23 of the shock absorber is placed in the parts feeder 22, and the workpieces 24 are sequentially fed to a supply section 25. A parts feeder 26 is provided on the other side of the base 21. Shock absorber caps 23 are placed in the parts feeder 26, and the caps 23 are sequentially fed to a supply section 27.

A loader 28 is mounted on the base 21. The loader 28 has chucks 29a and 29 at its tip.
b, and the rotating shaft 2 is rotated by a rotating mechanism (not shown).
It has arms 30a and 30b that pivot around center 8b and move up and down by a cylinder mechanism 28a. Note that the arms 30a and 30b are 90 mm. It is set up in an open V-shape.

A slit detection device 31 is provided at a predetermined location above the base 21 . This slit detection device 3
1, a bearing 32 is provided on a base 21 as shown in FIG. This bearing 3
A cylindrical support base 33 is rotatably fitted into the support base 2 . This support stand 33 has a shaft portion 34 and a collar portion 35, and the workpiece 24 is placed on the collar portion 35 by being rotatably fitted to the shaft portion 34. A position fixing roller 37 is disposed on one side of the support base 33 at an appropriate distance from the support base 33 . This position fixing roller 37 is fixed in position and rotatably supported by a bracket 38 attached to the base 21. Further, the position fixing roller 37 is connected to a shaft 40 of a motor (drive source) 39 provided within the base 21, and is configured to be rotated by the motor 39. On the other side of the support base 33, movable rollers (movable bodies) 41, 41 are arranged. The movable rollers 41, 41 are rotatably attached to arms 43, 43 provided on the holding frame 42. In addition, wheels 43 are attached to the holding frame 42, and wheels 43 are mounted on the fixed base 44 fixed to the base 21, and the wheels 43 are rotated by arrows A and B in FIG.
It is provided so that it can be moved in any direction.

Further, a cylinder mechanism 46 is horizontally attached to the fixed base 44 via a connecting member 45, and the holding frame 42 is attached to a piston rod 47 of this cylinder mechanism 46.

Further, a recess 48 is formed in the holding frame 42 , and a guide member 49 is attached to this recess 48 so as to protrude from the holding frame 42 . Magnetic sensors 50 and 51 are provided within the guide member 49 and spaced apart from each other. These magnetic sensors 5
0 and 51 are connected to a control mechanism (not shown). Note that 52 is a spring.

Further, a support member 61 is provided at a position facing the tip of the supply section 27 of the parts feeder 26 . To explain this support member 61, as shown in FIG. 6, a column 62 is erected on the base 21, facing the supply section 27. Cylinder 62
A nut 63 is screwed onto the upper part of the column 62, and this nut 63 allows a cylindrical support 66 having a flange 64 and a shaft 65 whose outer diameter is slightly smaller than the inner diameter of the workpiece 24 to be attached to the column 62. attached to the top. A recess 67 is formed in the support 66 . A locking piece (locking member) 68 is fitted into the recess 67 . The left end of this locking piece 68 in FIG. 6 is sharpened as shown in FIG.
It can be fitted into a slit 24a formed in the slit 24a. Gaps 69 and 70 are formed between the locking piece 68 and the wall surface forming the recess 67. Further, a groove 71 is formed on the upper surface of the locking piece 68. A set screw (stopper) 72 screwed onto the upper part of the shaft portion 65 is fitted into this groove 71 to allow movement of the locking piece 68 by a predetermined amount in the directions of arrows C and D in FIG. . Further, L-shaped air passages 73 and 74 are formed in the column 62 and the support body 66, respectively, so as to communicate with the gap 70. A pressurized air source (not shown) is connected to the air passage 73.

Further, a cylinder mechanism 75 is attached to the base 21 on the side opposite to the support member 61 with respect to the cap 23 fed to the tip end of the supply section 27 of the parts feeder 26. This cylinder mechanism 75
One electrode 76 is attached to the tip of the piston rod, and this electrode 76 is fitted into the cap 23 sent to the tip of the supply section 27 so that it can be moved toward the support member 61. being done.

Further, on the side opposite to the cap 23 with respect to the support member 61, the other electrode 7 has a semicircular recess 77.
8 is provided facing the workpiece 24 fitted to the shaft portion 65 and connected to a moving mechanism (not shown) capable of moving the workpiece 24 so that the recess 77 fits therein. .

Next, the operation of the workpiece position holding device configured as described above will be explained.

First, the loader 28 is raised to the upper limit position, and the parts feeder 22 is opened with the chuck 29a open.
position on the tip of the Next, the movable roller 4
1 and 41 from the support base 33, and one electrode 76 at the tip of the piston rod of the cylinder mechanism 75.
is spaced apart from the supply section 27 of the parts feeder 26, and the other electrode 78 is spaced apart from the support body 66. The workpiece 24 is not placed on the support stand 33,
The workpiece 24 is not fitted into the support body 66. Then, a pressurized air source is connected to the air passage 73 of the cylinder 62 to send pressurized air. Then, this air passes through the air passages 73 and 74 and enters the gaps 70 and 6.
9 and 69, and urges and moves the locking piece 68 in the direction of arrow D in FIG. The locking piece 68 then engages with the set screw 72 and stops.

Next, the supply section 2 of the parts feeders 22 and 26
A workpiece 24 and a cap 23 are placed at the tips of 5 and 27, respectively.

Then, the loader 28 is lowered and the chuck 29 is
a grips the workpiece 24 on the supply section 25, raises the loader 28, and then moves the arm 30a to the third
In the figure, the workpiece 24 is rotated 90 degrees in the direction of arrow E, and the workpiece 24 held by the chuck 29a is positioned directly above the support stand 33. Next, the loader 28 is lowered, the workpiece 24 is fitted onto the shaft portion 34, and the chuck 29a is opened to remove the chuck 24 from the workpiece 24.
9a and the loader 28 is raised. On the other hand, when the workpiece 24 is placed on the support stand 33,
The cylinder mechanism 46 operates to move the holding frame 42 in the direction of arrow A in FIG.
41 comes into contact with the workpiece 24 and presses the workpiece 24 against the fixed position roller 37, and the movable rollers 41,
41 and position fixing rollers 37, the workpiece 24 is held at three locations. Also, at this time, the guide member 4
The tip end surface of 9 comes into contact with the outer circumferential surface of the workpiece 24 . However, the sensors 50 and 51 are spaced apart from the workpiece 24. When the workpiece 24 is positioned by the movable rollers 41, 41 and the fixed position roller 37 in this way, the motor 39 rotates, and the rotation is transmitted to the fixed position roller 37. The position fixing roller 37 rotates, and the workpiece 24 is thereby rotated. At this time, the movable rollers 41, 41 move the workpiece 24
The rotation of the workpiece 24 is guided as a guide roller. When the workpiece 24 rotates, the outputs (detection signals) of the magnetic sensors 50 and 51 are monitored by a control mechanism (not shown) connected to the magnetic sensors 50 and 51 as the workpiece 24 rotates. And work 2
When the No. 4 slit 24a comes to a position facing the guide member 49, the output (detection signal) of the sensor 51 changes, thereby stopping the rotation of the motor 39 via the control mechanism. In addition, motor 3
In consideration of the rotational inertia of the motor 39, an adjusting device may be provided so that a force is applied to stop the rotation of the motor 39 just before the slit 24a faces the guide member 49. When the motor 39 stops, the loader 28
is reversed, and the arm 30a turns 90 degrees in the direction of arrow F in FIG. 3 and returns to its original position.

Next, the loader 28 descends again as described above,
The chuck 29a of the arm 30a grips the workpiece 24 on the supply section 25. At this time, support stand 3
The chuck 29b located above the chuck 3 descends and grips the workpiece 24 positioned on the support stand 33. When the chuck 29b grips the workpiece 24, the cylinder mechanism 46 is activated and the movable roller 41 is separated from the workpiece 24 together with the holding frame 42.
Then, when the loader 28 rises and reaches the upper limit,
As mentioned above, the arms 30a and 30b turn 90 degrees in the direction of arrow E in FIG. It is located directly above the support member 61. Next, loader 2
8 is lowered, the workpiece 24 held by the chuck 29a is placed on the support base 33 as described above, and the workpiece 24 held by the chuck 29b is placed on the support member 6.
1 to fit into the shaft portion 65 of No. 1. At this time, since the position of the slit 24a had been determined in advance at a predetermined position by the sensors 50 and 51, the slit 24a
4a faces the center of the cap 23 at the tip of the supply section 27 and is located at the tip of the locking piece 68;
The locking piece 68, which had been urged by pressurized air in the direction of arrow D in FIG. 6, is pressed in the direction of arrow C to fit the tip of the locking piece 68 into the slit 24a. Next, the chucks 29a and 29b are each opened, and the loader 28 is raised. At this time, the cylinder mechanism 75 is activated, and one electrode 76 presses the cap 23 and is displaced toward the workpiece 24 fitted to the shaft portion 65, and in synchronization with this, the other electrode 76 is moved to the workpiece 24 side. The electrode 78 is displaced, and the cap 23 and the work 24 are held between the cap 23 via one electrode 76 and the work 24 by the other electrode 78, and the cap 23 and the work 24 are held between the electrodes 76 and 78.
Weld 4. Note that during this welding, workpiece 2
4 is prevented from rotating by the locking piece 68, and the eighth
Since the slit 24a is only allowed to be displaced in the directions of arrows G and H in the figure, the slit 24a is connected to the cap 23.
It is welded so that it is always held in place. Moreover, the pressurized air that has flowed into the gap 70 from the air passage 74 passes through the gap 69 and is released toward the fitting portion of the locking piece 68 to the slit 24a of the workpiece 24. Blow away spatter, etc. that occurs during welding in the area. Therefore, spatter during welding is not caught between the slit 24a and the locking piece 68, and the cap 2
3 and the work 24 is completed, the work 24 can be easily taken out from the support member 61.

In the above embodiment, three rollers, the movable rollers 41 and 41 and the fixed position roller 37, were used to hold and rotate the workpiece 24 on the support base 33, but the present invention is not limited to this, for example. Only one fixed roller 37 may be used, and instead of the movable rollers 41, 41, members such as arcuate plates with low sliding resistance may be used.

As explained above, according to this invention, a workpiece is held between a fixed position roller rotating at a fixed position and a movable body having a sensor, the workpiece is rotated, and the slit in the workpiece is detected by the sensor. Since the drive source for the fixed position roller is stopped based on the detection signal, even if the inner diameter of the work varies, the work can be held and rotated between the fixed position roller and the movable body. Therefore, the slit in the workpiece can be easily and reliably detected and the workpiece can be held in a predetermined position, so that the next welding process can be performed reliably.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the main parts of a conventional workpiece position holding device, Figure 3 is a partially omitted perspective view of an embodiment of this invention, and Figure 4 is a view of the support 5 is a sectional view showing a state in which a workpiece is held between a position fixed roller and a movable body, FIG. 5 is a plan view of the main part thereof, FIG. Figure 7 is the − of Figure 6.
FIG. 8, which is an enlarged sectional view of the main part along the line, is a schematic explanatory view showing the state when the work and the cap are welded. 21... Base, 24... Work (mounting ring), 2
4a...slit, 28b...rotating shaft, 29a,
29b...chuck, 33...support stand, 34,6
5... Shaft portion, 37... Position fixing roller, 41...
Movable roller (movable body), 48, 67... recess, 5
0,51...Sensor, 61...Support member, 68...
... Locking piece (locking member), 69, 70 ... Gap, 7
2... Set screw (stopper), 73, 74... Air passage (gas passage).

Claims (1)

[Scope of utility model registration request] a support stand provided on the base to support the work; a position fixing roller fixed in position close to the support stand and rotatably connected to a drive source; a movable body that is provided so as to be able to approach and move away from the workpiece and sandwich the workpiece fitted to the support stand between the position fixing roller; A workpiece position holding device comprising a sensor that detects a provided slit and stops the drive source based on a detection signal from the sensor.