JPS6217166Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic tracing device for a seam welding machine that automatically regulates the seam line of an object to be welded.

The automatic copying device of a seam welding machine generally uses a copying plate cam system as shown in FIGS. 3 and 4. That is, the welding object 11 on the base 12 is moved by the drive given to the flange portion 16 of the welding object 11 by the rotation of the upper and lower electrode wheels 17 and 18. To regulate the movement trajectory, a plate cam 19 having the same or similar shape to the seam line is provided on the same shaft 22, and the shaft 22 is supported by relatively rotatable link arms 13 and 14, and the plate cam 19 is This is done by clamping the cam 19 between the cam plate 20 and the cam follower 21 and driving it to trace the seam line.

However, although this device can accurately control the position and speed when welding straight sections, it has the disadvantage that smooth rotation cannot be performed at corner sections. In other words, at corners, the rotation speed may be higher or lower than the normal rotation speed due to the inertia of the jig, etc.
Knocking-like oscillations and a "bouncing phenomenon" occur at the end of a corner, and this causes the rotational speed of the welding object to fluctuate. Conventionally adopted methods to prevent such phenomena are to attach a cylinder between the link arm 13 or 14 and the main body of the device, or to attach a fluid motor or electric motor to the link arm. There are some that rotate the central axis 22 of 19 in an auxiliary manner. However, in the former method, this is merely a measure to reduce the rebound phenomenon, and even in the latter method, the rotational speed of the shaft 12 is actually controlled at each corner unless the object to be welded is symmetrical. Since the speed differs depending on the angle, in practice it is not possible to change the speed for each corner, which is not satisfactory.

The present invention was devised as an alternative to such a conventional structure, and it is possible to feed the plate cam at a speed corresponding to the rotation of the electrode not only in straight sections but also in corner sections, and it is possible to feed the plate cam at a speed that corresponds to the rotation of the electrode not only in straight sections but also in corner sections. It is an object of the present invention to provide an automatic tracing device for a seam welding machine that can prevent speed fluctuations and "splash phenomenon".

In other words, in the present invention, when seam welding a flange formed on the peripheral edge of an object to be welded, a plate cam with the seam line of the flange projected onto a rotating plate that supports the object to be welded is arranged, and this plate cam is connected to an electrode. In an automatic copying device that guides and drives a seam line between a pair of electrode wheels while making contact between a cam plate provided directly below the wheel and an auxiliary roller and rotating in the same plane, a part of the cam plate is opened. In addition to the window, an auxiliary roller is provided in the fenestration portion to press against the outer peripheral surface of the plate cam, and the auxiliary roller is provided with a drive source for rotationally driving it in synchronization with the electrode wheel. This invention relates to an automatic copying device for a seam welding machine, which is characterized by an automatic copying device, and will be described below with reference to an embodiment shown in the drawings.

In FIGS. 1 and 2, reference numeral 4 denotes a plate cam, which has the same shape as the seam line of the object to be welded, similar to the conventional device described above. Reference numeral 1 denotes a cam plate, which contacts the plate cam 4 in order to trace and move on the seam line, and a part of which is fenestrated to provide a fenestrated portion 8. Reference numeral 2 denotes an auxiliary roller, which has a driving source and whose circumferential portion is pressed against the circumferential surface of the plate cam 4 via the aperture 8 . That is, as shown in FIG. 2, the auxiliary roller 2 is driven to rotate in synchronization with the electrode wheel via a reduction gear 9 using a motor 6 as a driving source.
Further, a crank arm 10 which is rotatable about a hinge pin 7 and is biased by a spring 5 is brought into pressure contact with the plate cam 4. Therefore, the auxiliary roller 2 is clamped by the cam follower 3 disposed opposite thereto, and causes the plate cam 4 to rotate auxiliarily.

In this embodiment with the above configuration, when this is used, as in the conventional example shown in FIGS. 3 and 4,
The object to be welded is moved by the drive applied to the flange portion of the object to be welded by the rotation of the upper and lower electrode wheels of the seam welding machine, and the movement trajectory is controlled by the contact of the plate cam 4 with the cam plate 1. However, in this embodiment, the plate cam 4 further includes:
Due to the pressure contact of the auxiliary roller 2 which is driven and rotated, and the clamping pressure by the cam follower 3 installed opposite to the auxiliary roller 2,
The rotation speed of the plate cam is regulated by the rotation speed of the auxiliary roller 2. Therefore motor 6
When the plate cam 4 is rotated in synchronization with the electrode wheel, the plate cam 4 can be sent at a speed that corresponds to the rotational speed of the electrode wheel, not only in straight sections but also at corner sections, thereby preventing speed fluctuations that occur at corner sections. be able to. Furthermore, if a "splash phenomenon" does not occur when corner welding is completed, that movement acts as a force that tries to reverse the motor, which creates resistance and prevents the rebound.

Furthermore, even if it is not possible to increase the pressure applied to the welding object due to welding conditions, and therefore the driving force of the electrode wheel cannot apply sufficient rotational force to the welding object, stable rotation can be achieved with the driving force of the auxiliary roller 2. It can give you strength. In addition, if the auxiliary roller 2 is provided with incised teeth, and if the entire circumference of the plate cam 4 is provided with corresponding gears, more accurate speed regulation can be achieved without biasing the auxiliary roller 2 with the spring 5 or the like. It can be carried out.

As described above, the present invention uses an auxiliary roller that itself drives and rotates to make the rotation speed of the plate cam more accurate, especially when welding corners.
This prevents the rotation speed from becoming higher or lower than the normal speed, knocking-like vibrations, and "splashing phenomenon" at the end of corner welding, thereby preventing defects in welded parts that may occur due to these. It is possible to solve this problem and obtain a good welding condition.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted plan view showing an embodiment of the present invention, FIG. 2 is a partially sectional front view of the same, FIG. 3 is a plan view of a conventional device, and FIG. 4 is a partially sectional front view of the same. 1...Cam plate, 2...Auxiliary roller, 3...
...Cam follower, 4...Plate cam, 5...Spring, 6
... Motor, 7 ... Hinge pin, 8 ... Fenestration.

Claims (1)

[Scope of utility model registration request] When seam welding a flange formed on the peripheral edge of an object to be welded, a plate cam with the seam line of the flange projected onto the rotating plate that supports the object to be welded is placed, and this plate cam is placed directly below the electrode ring. In an automatic copying device that guides and drives a seam line between a pair of electrode wheels while making contact between a provided cam plate and an auxiliary roller and rotating within the same plane, a part of the cam plate is opened, and A seam characterized in that the fenestration part is provided with an auxiliary roller that presses against the outer peripheral surface of the plate cam, and the auxiliary roller is provided with a drive source for rotationally driving the auxiliary roller in synchronization with the electrode wheel. Automatic copying device for welding machines.