JPH0211986Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of 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 horizontal fillet welding of the intersection of two metal plates, and recently, as shown in Fig. 1, the angle θ formed by the welded members 1 and 2 is obtuse Therefore, the angle α between the slide bar 3 and the horizontal plane is small, so the slider 4
Even in cases where the component force 6 of the gravity 5 in the downward direction becomes small and smooth downward movement of the slider cannot be expected, the spring-driven simple automatic welding machine proposed in Japanese Patent Application No. 57-221104 can be used. It is now possible to weld.

By the way, the spring-driven simple automatic welding machine proposed in Japanese Patent Application No. 57-221104 operates at least one roller out of a plurality of guide rollers pivotally supported by the slider 4 using the unwinding force of a constant output spring. The roller rotates and uses the roller as a driving wheel, but in order to prevent slippage between the driving wheel and the slide bar, the driving wheel is strongly pressed against the slide bar, and for this reason, the roller rotates around the slide bar. The rotation of the freely mounted slider is suppressed. Therefore, the ability of the tip of the welding rod to follow the weld line is reduced, and there is a risk that the weld line will not be followed properly.

The present invention solves the above-mentioned problems and provides a simple automatic welding machine of a spring-driven type that can easily follow a welding line even when the angle θ formed by the welded material is an obtuse angle.

The gist of the present invention is that, 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 and can freely roll with respect to the slide bar. At least one of the plurality of guide rollers provided
This simple automatic welding machine is characterized in that the rollers are drive gears rotated by the unwinding force of a constant output spring, and a rack is provided on the slide bar at a position corresponding to the drive gear.

The present invention will be explained below using the drawings.

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

In FIG. 2, 1 and 2 are members to be welded, and the welding machine is supported by a stand 7 and a positioning plate 8, and is placed on the member to be welded 2.
A welding rod 9 is attached to the slider 4 via a holder 10, and the slider 4 is movable along a slide bar 3 provided with a rack 25. 11 and is configured to weld a welding line 12. Note that 13 is a welding power supply cable.

The details of the structure and operation of the slider 4 of the present invention will be explained in detail with reference to FIGS. 3, 4, and 5A and 5B. Slider 4 is guide roller 1
4 and 15 and the drive gear 16, the slide bar 3 is held between the slide bar 3 and the drive gear 16, and is movable along the longitudinal direction of the slide bar 3. guide roller 14,
15 is rotatably provided on the slider via support shafts 17 and 18, and a drive gear 16 is provided on the slider 4 via a bush 19 via a drive shaft 20.
The teeth 26 of the drive gear 16 mesh with the teeth 29 of a rack 25 provided on the slide bar 3. or,
A spindle 23 of an unwinding reel 22 of a band-shaped constant output spring 21 is fixed to the slider 4 . One end of the constant output spring 21 is fixed to the unwinding reel 22, and the other end is fixed to the winding reel 24, and the drive shaft 20 also serves as a support shaft for the winding reel 24. , is fixed to the winding reel 24 by a fixing screw 32. Further, as shown in FIG. 5A, a slight gap a is provided between the center line 34 of the tooth 26 of the gear 16 and the center line 33 of the tooth 29 of the rack 25.

The basic operation of the simple automatic welding machine of the present invention having the above-mentioned configuration is that when the slider 4 is moved and the welding rod 9 is set at the welding start position, the gear 16 meshing with the rack 25 moves as follows. The slider 4 is rotated by the movement to the start position, and the winding reel 24 is rotated in the direction of arrow 30 via the drive shaft 20 to wind the winding reel 24 of the constant output spring 21 . After welding starts, as the welding rod 9 wears out, the take-up reel 24 rotates in the direction of the arrow 31 due to the unwinding force of the constant output spring 21. A drive shaft 20 fixed to a take-up reel 24
The drive gear 16 also rotates in the same direction, and the slider 4 descends in the direction of the arrow 11 (FIG. 4) in synchronization with the wear of the welding rod 9.

At this time, as shown in FIG.
Since there is a gap a, the slider 4 can rotate in the direction of the arrow 27 or 28, albeit at a slight angle with respect to the slide bar 3, as shown in FIG. 5B. By this rotation, even better weld line tracing can be obtained.

As described above, in the welding machine of the present invention, a constant output can be obtained from the start to the end of welding, and good welding can be performed without deteriorating the followability of the weld line.

In addition, in this welding machine, if the fixing screw shown in Fig. 3 32 is removed, the drive shaft 20 and the winding reel 24
can be released and used as a conventional gravity welder.

In the above-mentioned embodiment, only one driving gear is used, but the same effect as in the above-mentioned embodiment can be obtained even if a constant output spring is connected to each of the other guide rollers to form a plurality of driving gears. It will be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram for explaining the slider descending force of a gravity welding machine, Fig. 2 is a perspective view showing an embodiment of the welding machine of the present invention, and Fig. 3 is a constant output spring mounting structure of the welding machine of the present invention. 4 is a bottom view thereof, and FIGS. 5A and 5B are partial sectional views of the welding machine shown in FIG. 3. 1, 2... member to be welded, 3... slide bar,
4...Slider, 5...Gravity, 6...Component of gravity, 7...Stand, 8...Positioning plate, 9...
Welding rod, 10...Holder, 11...Descent direction, 1
2...Welding wire, 13...Power supply cable, 14,1
5... Guide roller, 16... Drive gear, 17,
18... Support shaft, 19... Bush, 20... Drive shaft, 21... Constant output spring, 22... Reel for rewinding, 23... Reel support shaft, 24... Reel for winding, 25... Rack, 26... Drive gear tooth, 2
7, 28...Slider rotation direction, 29...Rack teeth, 30, 31...Reel rotation direction,
32... Fixing screw, 34... Center line of teeth of drive gear, 33... Center line of teeth of rack.

Claims (1)

[Scope of utility model registration request] 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, a plurality of guide rollers that are pivotally supported by the slider and are provided so as to be able to roll freely relative to the slide bar are used. A simple automatic welding machine characterized in that at least one of the rollers is a drive gear rotated by the unwinding force of a constant output spring, and a rack is provided on the slide bar at a position corresponding to the drive gear.