JPH0248148Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a support device for an equalizing shaft that guides a pressure cylinder in a resistance welding machine.

(Prior art and its problems) There is a resistance welding machine in which a pair of support members supports a first and second electrode in a state where they butt each other, and the overlapping portion of the welded material is sandwiched and welded between the two electrodes. It is used. In this resistance welding machine, the support member to which one electrode is attached is a movable arm, and the support member to which the other electrode is attached is a fixed arm so that both electrodes can be moved close to or apart from each other. The movable arm is fixed to the piston rod of the pressurized cylinder, while the fixed arm is fixed to the cylinder case of that cylinder. The pressure cylinder has an equalizing shaft fitted into a protrusion formed protruding from the cylinder case in order to move the entire arm forward or backward relative to the welding machine main body. This equalizing shaft is attached to a transformer of a welding machine via a pair of L-shaped stays.

By the way, since this type of resistance welding machine is usually installed in a factory where many other instruments, parts, etc. are scattered, it is necessary to make the protruding part as small as possible. Otherwise, when moving the resistance welding machine or transporting other equipment or parts, the equipment or parts may get caught on the protruding parts.
Unexpected accidents may occur. However, in conventional resistance welding machines, the equalizing shaft is supported by an L-shaped stay on the transformer side.
There was a drawback that the protruding portion had to be made larger by the thickness of the shape material and the thickness of the mounting seat to which the L-shaped material was attached.

(Purpose of the invention) In order to solve such problems, the present invention aims to reduce the height at which the equalizer projects from the transformer and to reduce the number of parts.

(Structure of the invention) In order to achieve the above-mentioned object, the present invention has first and second electrodes supported at the tips of a pair of supporting members in a state where they butt each other, and the material to be welded is held between the electrodes. In a resistance welding machine having a pressure cylinder that drives the support member, one support member is attached to the piston rod of the pressure cylinder, the other support member is attached to the cylinder case of the pressure cylinder, and the cylinder case is formed. The transformer is characterized in that equal-lunging shafts that fit into the protrusions are stretched over extensions of both side plates of the transformer.

(Example) Next, the present invention will be specifically explained using the drawings. FIG. 1 shows an embodiment of the present invention. The transformer 1 is covered on both sides by side plates 2, which are fastened with bolts 3. Extension portions 2' are formed on each side plate. An equalizing shaft 4 for guiding a pressure cylinder is stretched over the extensions 2' of both side plates 2. This equalizing shaft 4 passes through a hole provided in a protrusion 5' formed on the peripheral wall of the pressure cylinder 5. In FIG. 1, a bearing is provided on the protrusion 5' side, so that the pressure cylinder 5 is slidable with respect to the equalizing shaft 4. However, the present invention is not limited to this, and it goes without saying that the equalizing shaft 4 and the pressure cylinder 5 may be designed to be slidable relative to the transformer 1. One support member 7 serving as a movable arm is attached to the piston rod 6 of the pressurizing cylinder 5.
On the other hand, the other support member 8, which becomes a fixed arm, is fixed to the cylinder case of the pressurizing cylinder 5. First and second electrodes 9 and 10 are attached to the tips of the pair of support members 7 and 8, respectively. Both electrodes 9 and 10 are supplied with a predetermined current from the transformer 1 via a conductor 11.

When the material to be welded A is sent in a positional relationship with respect to a predetermined welding machine, the movable arm 7 is advanced toward the material to be welded A from the retreated position, and the material to be welded A is sent to the first,
Welding is performed by sandwiching the electrode between the second electrodes 9 and 10. In addition, if the material to be welded A is sent in a state that is deviated from its predetermined positional relationship, after moving the pressurizing cylinder 5 forward or backward by a distance corresponding to the deviation, the movable arm is moved in the same manner as in the former case. Drive to perform welding.

Comparing this type of equalizing shaft support device with the conventional support device shown in Fig. 2,
It can be seen that the structure is simplified and the installation height is reduced. That is, in the conventional support device shown in FIG. 2, the equalizing shaft 4 is attached to the transformer 1 via the L-shaped stay 12 and the stay mounting seat 13. In contrast, in the embodiment of the present invention, the equalizing shaft 4 is attached to the extension 2' of the side plate 2 of the transformer. Therefore, there is no need to use a separate stay and its mounting seat, and you only need to use a slightly extended side plate that covers both sides of the transformer.In addition, since no stay is used, the installation height can be adjusted depending on the thickness of the stay and its mounting height. It can be kept low by the thickness of the mounting seat.

(Effects of the invention) As described above, in the present invention, the equalizing shaft is stretched over the extension of the side plates provided on both sides of the transformer, without using the stay and its mounting seat. Because of this, the height of the equalizing shaft and the mounting height of the pressure cylinder can be kept low due to the simplified design that uses fewer parts. The degree of entanglement with equipment, parts, etc. scattered around the machine is reduced, resulting in excellent workability. Furthermore, the side plates themselves are considerably stronger in terms of strength than the transformer peripheral wall, and since both side plates are fastened with fasteners, the equalizing shaft can be reliably supported.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a conventional equalizing shaft mounting structure. 1...Transformer, 2...Side plate, 2'...Side plate extension, 4...Equalizing shaft, 5...
Pressure cylinder, 12...L-shaped stay, 13...stay mounting seat.

Claims (1)

[Scope of utility model registration request] In a resistance welding machine, a resistance welding machine has a pressurizing cylinder in which first and second electrodes are supported at the tips of a pair of support members in a state where they butt each other, and the support members are driven so as to sandwich a workpiece to be welded between the electrodes, One support member is attached to the piston rod of the pressure cylinder, the other support member is attached to the cylinder case of the pressure cylinder, and the equalizing shaft that fits into the protrusion formed on the cylinder case is attached to the side plates of the transformer. A support device for an equalizing shaft of a resistance welding machine, characterized in that it is stretched over an extension part.