JPS6229145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple automatic welding machine that performs welding by moving a slider equipped with a welding rod along a slide bar as the welding rod wears out.

Conventionally, gravity welding machines have been widely used as a means for performing horizontal fillet welding of members in which two plates intersect. This welding machine performs welding by lowering a slider with a welding rod holder attached using the slider's gravity, and because it does not require electrical power to lower the slider, it is highly portable and easy to operate. There are good advantages. By the way, when horizontal fillet welding is performed using a gravity welding machine, the intersection angle θ of the welded materials 1 and 2 is
is 90 degrees as shown in FIG. 1A, or obtuse as shown in FIG. 1B, and the angle α between the slide bar 3 and the horizontal is different. Therefore, the gravity 5 of the slider 4 that holds the welding rod
The component force 6 in the direction of the slide bar becomes small when the intersection angle θ is an obtuse angle, making it impossible to expect the slider 4 to descend smoothly, and there is a possibility that the welding rod's ability to follow the welding line will deteriorate. To solve this problem, measures such as increasing the weight of the slider 4 or lowering the slider 4 by driving a motor may be considered, but this would impair the portability of the welding machine.
Instead, it becomes a problem.

In view of the above problems, the present invention provides a welding machine in which the slider 4 is lowered by a simple means.The gist of the present invention is to move the slider equipped with a welding rod to the slide bar as the welding rod wears out. In a simple automatic welding machine that performs welding by descending along the slide bar, at least one roller out of a plurality of guide rollers that are pivotally supported by a slider and provided so as to be able to roll freely relative to the slide bar is used to unwind a constant output spring. A simple automatic welding machine characterized by a drive wheel that rotates by force.

The present invention will be explained in detail below with reference to the drawings.

FIG. 2 is a perspective view showing a mode in which the welding machine of the present invention is applied to fillet welding, FIG. 3 is a sectional view showing the structure of the slider of the welding machine of the present invention, and FIG. 4 is an external view of the slider. 5A and 5B are partial cross-sectional views of FIG. 4.

In Fig. 2, 1 and 2 are materials to be welded,
The welding machine is placed on the workpiece 2 by means of a stand 7 and a positioning plate 8. A welding rod 9 is attached to the slider 4 via a holder 10, and the slider 4 is movable along the slide bar 3.
1 direction to weld the weld line 12. Note that 13 is a welding power supply cable.

The details of the structure and operation of the slider 4 will be explained with reference to FIGS. 3, 4, and 5A and 5B.

The slider 4 holds the slide bar 3 between guide rollers 14 and 15 and a drive wheel 16, and is movable along the longitudinal direction of the slide bar 3. Guide rollers 14, 15 are supported by support shafts 17, 1
The drive wheel 16 is rotatably mounted on the slider 4 by a bush 19 and a drive shaft 20 . In addition, the slider 4 is provided with a rewinding reel 2 of a belt-shaped constant output spring 21.
Two support shafts 23 are solidified. On the other hand, one end of the constant output spring 21 is fixed to the winding reel 24, and the drive shaft 20 also serves as a support shaft for the winding reel 24. A saw blade-shaped groove 25 is provided on the inner surface of the end of the winding reel 24, as shown in FIG.
As shown in FIG.
It engages with a pawl 28 projecting outward at 7 to form a ratchet mechanism. FIG. 5B shows another example of a ratchet mechanism constructed from a leaf spring 29 and a groove 25 provided on the drive shaft 20, which operates in the same manner as the mechanism shown in FIG. 5A.

The operation of the welding machine of the present invention with the above configuration is as follows: First, after the welding rod 9 is set at the welding start position, when the winding reel 24 of the constant output spring 21 is rotated in the direction of the arrow 30, the claw 28 or The leaf spring 29 does not engage the groove 25 and therefore the drive shaft 2
0, the winding reel 24 is freely rotatable, and the constant output spring 21 is wound onto the reel 24. After fully winding the constant force spring 21,
Start welding. Before or immediately after the start of welding, the slider 4 is supported by the rigidity of the welding rod 9 and does not fall, but as the welding rod 9 wears out, the take-up reel 24 moves as indicated by the arrow 31 due to the unwinding force of the constant output spring 21. Rotate in the direction. The pawl 28 or leaf spring 29 engages with the groove 25, and the drive shaft 20 and the drive shaft 16 also rotate in the same direction as the arrow 31, and the slider 4 descends in the direction of the arrow 11. Here, constant output spring 2
If a mainspring whose output changes depending on the winding amount is used instead of 1, the force moving down the slider 4 will be attenuated between the start of welding and the end of welding, and good welding will not be possible. According to the welding machine of the invention, a constant output can be obtained from the start to the end of welding, and good welding can be performed. It goes without saying that the welding machine of the present invention is particularly effective when the intersecting angle θ is obtuse as shown in Figure 1B, but when the welding machine is welding where the intersecting angle θ is about 90° as shown in Figure 1A. When welding materials, as long as the constant output spring 21 is not involved, it can be used as a conventional gravity welding machine, and can be applied to a variety of purposes.

In the above-mentioned embodiment, only one drive wheel is used, but the same effect as in the above-mentioned embodiment can be obtained even if a plurality of drive wheels are provided by connecting constant output springs to each of the other guide rollers.

As described above, the welding machine of the present invention is useful as a multipurpose welding machine that exceeds the capabilities of conventional gravity welding machines, and has great industrial value.

[Brief explanation of the drawing]

Figures 1A and B are schematic diagrams showing the slider lowering force of a gravity welding machine, Figure 2 is a perspective view showing an embodiment of the welding machine of the present invention, Figure 3 is a partial sectional view of the welding machine of the present invention, and Figure 4 The figure is an external view of the same as above, Figure 5A is Figure 2X
-Y section sectional view. 1 and 2 are the materials to be welded, 3 is a slide bar, 4 is a slider, 5 is gravity, 6 is a component of gravity, 7 is a stand, 8 is a positioning plate, 9 is a welding rod, 10 is a welding rod holder, 11 is a descending direction, 12 is a welding line, 13 is a power supply cable, 14 and 15 are guide rollers, 16
is a drive roller, 17 and 18 are spindles, 19 is a bush, 20 is a drive shaft, 21 is a constant output spring, 22 is a rewinding reel, 23 is a reel spindle, 24 is a winding reel, 25 is a groove, 26 is a hole, 27 is a coil spring, 28 is a pawl, 29 is a leaf spring, and 30 and 31 are the winding reel rotation directions.

Claims (1)

[Claims] 1. In a simple automatic welding machine that performs welding by lowering a slider equipped with a welding rod along a slide bar as the welding rod wears out, the slider is pivotally supported by the slider,
A simple automatic welding machine characterized in that at least one roller out of a plurality of guide rollers provided to be freely rotatable with respect to a slide bar is a drive wheel that rotates by the unwinding force of a constant output spring.