JPS6217168Y2 - - 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 work 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. The movement trajectory is controlled by moving the cam plate 19, which has the same or similar shape to the seam line, to the coaxial 22.
The shaft 22 is supported by relatively rotatable link arms 13 and 14, and the plate cam 19
This is done by clamping the seam between the cam plate 20 and the cam follower 21 and driving it tracing along the seam line.

However, with this device, when welding straight sections, accurate position and speed regulation can be performed, but at corner sections, the rotation speed may be higher or lower than the normal rotation speed due to the inertia of the jig. Waving, knocking-like oscillations, and a "springing phenomenon" at the end of corner welding occur, which causes the speed of the workpiece to fluctuate, which has the disadvantage that accurate position and speed regulation cannot be performed.

Conventionally adopted methods to solve this drawback include attaching a cylinder between the link arm 13 or 14 and the main body of the device, or attaching a fluid motor or electric motor to the link arm. There are some that rotate the center shaft 22 auxiliary. However, in the case of the former method,
This is merely a measure to reduce the bounce phenomenon, and even in the latter method, the axis 12
Unless the workpiece is symmetrical, the rotation speed will differ depending on each corner, so in practice it is not possible to switch 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 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 and an auxiliary roller provided directly below the electrode wheels and rotating them in the same plane, the cam plate is connected to the plate cam. The auxiliary roller is in pressure contact with the inner circumferential surface of the plate cam, and the auxiliary roller is further provided with a drive source for rotationally driving the auxiliary roller in synchronization with the electrode wheel. The present invention relates to a copying device for a seam welding machine, and will be described below with reference to an embodiment shown in the drawings.

In Figures 1 and 2, numeral 3 is a plate cam, which, like the conventional device described above, is made of a flat plate formed in the same shape as the locus to be welded, and is fixed to the underside of a rotating plate that supports the welding object. . 1 is an electrode ring (not shown)
This is a cam plate fixed in position directly below the cam plate, and is provided so as to come into contact with a plate cam 3, which will be described later, so that the plate cam 3 slides on its surface. 2 is an auxiliary roller,
It has a driving source, and its circumferential surface is pressed against the inner circumferential surface of the plate cam 3, and the plate cam 3 is clamped together with the opposing cam plate 1. As shown in FIG. 2, this auxiliary roller 2 uses a motor 4 as a driving source and is configured to be rotated through a reduction gear 7 in synchronization with the electrode wheel. Furthermore, this roller 2 is rotatable around a hinge pin 6 and is configured to press against the inner circumferential surface of the plate cam 3 by a crank arm 8 urged by a spring 5.

When using this embodiment with the above configuration, the drive is applied to the flange portion of the welding object by the rotation of the upper and lower electrode wheels of the seam welding machine, similar to the conventional device shown in FIGS. 3 and 4. The object to be welded is moved by the plate cam 3, and its movement trajectory is regulated by the plate cam 3.
This is done by contacting the cam plate 1. However, in this embodiment, the plate cam 3 further includes:
Since the rotation speed of the auxiliary roller 2 is regulated by the rotational speed of the auxiliary roller 2, since the auxiliary roller 2 is in pressure contact with the auxiliary roller 2 and is clamped by the cam plate 1 that is disposed opposite the auxiliary roller 2 .

Therefore, when the auxiliary roller 2 is rotated by the motor 4 in synchronization with the electrode axis, the plate cam 3 is always moved or rotated at a speed corresponding to the rotational speed of the electrode wheel, regardless of whether it is a straight section or a corner section. This prevents speed fluctuations that occur at corners. 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.

In addition, even when it is not possible to increase the pressure applied to the object to be welded due to welding conditions, and therefore the driving force of the electrode wheel cannot provide sufficient moving driving force or rotational force to the object, the driving force of the auxiliary roller 2 It is possible to perform stable movement or rotation by applying movement driving force or rotational force. In addition, if the auxiliary roller 2 is provided with teeth on its circumferential surface, and the inner circumference of the plate cam is provided with corresponding teeth, accurate speed regulation can be achieved without biasing the auxiliary roller 2 with the spring 5 or the like. I can do it. Further, in the embodiment described above, the spring 5 was used to bias the auxiliary roller 2, but a cylinder may be used instead.

As explained above, the present invention presses the auxiliary roller, which is driven and rotated by itself, against the inner peripheral surface of the plate cam,
This makes the movement and rotational speed of the plate cam uniform, and the movement trajectory of the plate cam is regulated by clamping the plate cam with the auxiliary roller and the cam plate.Especially when welding corners, it is possible to maintain the normal rotational speed. It is possible to prevent the welding speed from becoming higher or lower than the actual welding speed, knocking-like oscillations, and the "splashing phenomenon" at the end of corner welding, thereby making it possible to obtain a good welding condition.

[Brief explanation of drawings]

FIG. 1 is a partial 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 the conventional device, and FIG. 4 is a partially sectional front view. 1...Cam plate, 2...Auxiliary roller, 3...
...Plate cam, 4... Drive source (motor).

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, the cam plate is attached to the outer peripheral surface of the plate cam. contact,
A copying device for a seam welding machine, wherein the auxiliary roller presses against the inner circumferential surface of a plate cam, and the auxiliary roller is further provided with a drive source for rotationally driving the auxiliary roller in synchronization with an electrode wheel.