JPH032387Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a nut supply device for a spot welding machine, and was devised by paying attention to the special circumstances of spot welding machines. When spot welding machines are used in automobile sheet metal assembly plants, etc., cooling water and air piping, various jigs, machine frames, etc. are intertwined in a complex manner, so it is necessary to make the related equipment as compact as possible. There is. The nut feeding device according to the present invention has been devised to be suitable for the above-mentioned usage environment, and is also excellent in terms of durability and disassembly and maintenance, and the original functions of related parts are slightly improved. By modifying the nut supply pipe, a notch is provided in the nut supply pipe with a rectangular cross section, and the end thereof is made into a bifurcated shape to provide an effective functional part for the temporary locking chamber. This nut supply pipe is fixed to the end face of the guide pipe of the supply rod, and a series of identical planes are formed by the plane formed by providing a cutout in the guide pipe and the end face of the nut supply pipe. form,
It is characterized by a thick flat magnet that is pressed and fixed against this plane.

Hereinafter, the present invention will be explained in detail according to the illustrated embodiment.A fixed electrode 1 and a movable electrode 2 are arranged approximately coaxially, a steel plate 3 is placed on the fixed electrode 1, and a steel plate 3 is placed on the fixed electrode 1. The movable electrode 2 is brought into close contact with the placed projection nut 4 to perform electric resistance welding. The nut feeder is indicated generally by the numeral 5. The nut supply device 5 mainly consists of a supply rod 6, a guide pipe 7 that guides it, a nut supply pipe 8 connected to a parts feeder (not shown), and a magnet 9. To explain from Figure 2 onwards, the guide tube 7
As is clear from FIGS. 2 and 4, the end face 10 of the nut supply pipe 8 has a planar shape, and the tip of the nut supply pipe 8 has a rectangular cross section as shown in FIGS. 2, 3, and 5. The parts are brought into close contact and the two are fixed by a suitable method, for example by welding. As mentioned above, the nut supply pipe 8 has a rectangular cross section in order to correctly maintain the front and back sides and orientation of the nut 4, and
1 is provided. By providing this notch, the end of the nut supply pipe 8 becomes bifurcated, as is clear from FIG. 5, thereby forming a space for the temporary fixing chamber 11. .

A flat surface 14 is formed in the lower part of the guide tube 7 by the cutout 13, and the flat surface 14 is coplanar with the end surface 15 of the nut supply tube 8. The thick plate-shaped magnet 9, which is a slightly flattened rectangular parallelepiped, is a permanent magnet, and as is clear from FIGS. 2 and 3, it is fixed in a pressed state against the flat surface 14 and the end surface 15. As an example of this fixing method, a method of screwing the presser metal fitting 16 with a bolt 17 was adopted. The magnet 9 is made by drilling a hole 19 in the slightly thick substrate 18, fitting the magnet piece 20 into the hole, and inserting the covering plate 21, 22 from the left and right.
The magnet piece 20 corresponds to the nut 4.

The supply rod 6 inserted into the guide hole 23 in the guide tube 7 consists of a large-diameter rod portion 24 and a small-diameter guide portion 25 that enters the screw hole of the nut 4, and has an extrusion surface 26 at the boundary between the two. is provided.

In FIG. 2, the nut 4 is attracted by the magnet 9 and is temporarily locked in the temporary locking chamber 11, and when the supply rod 6 advances, the guide part 2
5 enters the screw hole of the nut 4, pushes the nut 4 down with the extrusion surface 26, and reaches the steel plate 3 as it is. In order to keep the nut 4 on the extrusion surface 26 during the advance of the supply rod 6, the advance speed of the supply rod 6 is set to be approximately the same as or faster than the falling speed of the nut 4. Incidentally, it is appropriate that the forward and backward movement of the supply rod 6 be performed by an air cylinder 27 as shown in FIG.

The effects of the present invention will be described below. The part that performs the temporary fixing function is formed as a structure in which the guide tube 7, nut supply tube 8, and magnet 9 are integrated without using any other members. , the space required for this part is extremely small, and its utility value is extremely high in the above-mentioned automobile sheet metal assembly factory. When obtaining the above structure,
The original functions of the guide tube 7 and nut supply tube 8 are provided with a flat surface by the cut section and a notch for a temporary locking chamber, and the structure does not require the addition of separate parts, making the device simple and compact. It becomes possible to form a structure. In particular, due to the notch provided in the nut supply pipe with a rectangular cross section, the tip of the supply pipe has a diameter of 22 mm.
It has a crotch shape, which is extremely effective in securing space for the temporary locking chamber, and at the same time, the rectangular cross section provides good adhesion to the end surface of the guide tube, and this close contact allows the temporary locking chamber to be successfully obtained.

Since a large number of impact forces are applied to the magnet due to the inertial force when the nut is attracted, the magnet must be mounted firmly and securely. In the device of this invention, the plane of the guide tube and the end surface of the nut supply tube form a series of identical planes, and a thick flat magnet is pressed against the entire plane, so that the contact area of the magnet is widened. The magnet can be set easily, the stability of the magnet attachment is excellent, and the durability is also good. And the magnet is
Since it is a so-called flat contact type, it can be mounted with high stability using only a simple holding fitting as shown in FIG. 2, for example.

By appropriately selecting the length and depth of the cut portion of the guide tube, the mounting position of the magnet can be set appropriately, and the nut can be attracted more effectively. In particular, the internal structure of the magnet is the second
It is more effective if it is done as shown in the figure.

Furthermore, in the simple structure as described above, by making the magnet removable, the parts can be disassembled and repaired with great ease.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view schematically showing the entire device, FIG. 2 is a vertical side view showing the main parts of the device, and FIG.
FIG. 4 is a three-dimensional view of the end of the guide tube, FIG. 5 is a three-dimensional view of the end of the nut supply tube, and FIG. 6 is a three-dimensional view of the magnet. 6... Supply rod, 7... Guide tube, 10...
End face, 11... Temporary fixing chamber, 12... Notch, 8...
Nut supply pipe, 13... Cutting part, 14... Flat surface,
9...Magnet.

Claims (1)

[Scope of utility model registration request] A space for a temporary locking chamber is formed by providing a notch in a nut supply pipe with a rectangular cross section and making the end part into a bifurcated shape, and fixing this nut supply pipe to the end face of a guide pipe of a supply rod, A series of identical planes are formed by the plane formed by providing a cutout in the guide tube and the end face of the nut supply tube, and a thick flat magnet is pressed and fixed against this plane. A nut feeding device for a spot welding machine featuring: