JP2002283148A - Projection nut supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems such as a large number of machining man-hours and expensive cost when boring a hole having a circular cross section on a hollow shaft having a rectangular cross section so as to prevent a rod from rotating by making the hollow shaft have the rectangular cross section and boring a rectangular guide hole on a guide pipe, in a generally embodied projection nut supplying device wherein a temporary fixing chamber is formed at a part where a component supplying pipe and the guide pipe intersect, the supplying rod moving forward/backward in the guide pipe is provided, and the supplying rod is moved forward/backward by an air cylinder. SOLUTION: A piston rod 20 of the air cylinder 6 moving forward/backward the supplying rod 7 is prevented from rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A temporary fixing chamber for a projection nut is formed at a location where a component supply pipe and a guide pipe intersect, and a supply rod is provided for moving forward and backward in the guide pipe.
A projection nut supply device of a type in which the supply rod is moved forward and backward by an air cylinder is generally implemented. The present invention belongs to such a technical field.

[0001]

2. Description of the Related Art Generally, a projection nut supply device is provided with a projection nut temporary fixing chamber formed at a point where a component supply pipe and a guide pipe intersect, and a supply rod for moving forward and backward in the guide pipe. The supply rod is moved forward and backward by an air cylinder. The supply rod includes a guide rod that enters the screw hole of the projection nut, a slide rod having a diameter larger than that of the guide rod, and an extrusion surface formed at the boundary between the guide rod and the slide rod. It has a hollow shaft movably fitted therein, and the supply rod is slidably supported on the guide tube.

In the conventional structure as described above, since a stopper piece and a detecting projection for detecting an advanced state are provided on the supply rod, some structure is adopted to prevent the supply rod from rotating. I have. As means for restraining this rotation, the hollow shaft has a square cross section, and a square guide hole is also formed in the guide tube. Since the square hollow shaft is slidably fitted in the square guide hole, rotation is prevented.

[0003]

When drilling a hole having a circular cross section in a hollow shaft having a rectangular cross section, gun drilling is generally employed, but the number of processing steps is increased and the cost is reduced. Is significantly increased. Further, it is difficult to obtain a shaft member having a square cross section as a standard material, and after all, it is necessary to arrange it as a custom-made product.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems, and the invention of claim 1 is directed to a case where a part supply pipe and its guide pipe cross each other. A temporary fixing chamber for the projection nut is formed where
A supply rod is provided for moving back and forth in the guide pipe. The supply rod is formed at a boundary between the guide rod which enters the screw hole of the projection nut, a slide rod having a diameter larger than the guide rod, and the guide rod and the slide rod. It has a hollow shaft in which the pushing surface and the sliding rod are slidably fitted, and an air cylinder for moving the supply rod forward and backward is installed, and the piston rod of the air cylinder is configured to be unable to rotate. It is characterized by having.

[0005] Since the rotation of the piston rod of the air cylinder is restricted in this way, it is not necessary to employ a hollow shaft having an irregular cross section for the supply rod. That is, a normal pipe material may be used for the hollow shaft, and a standard pipe material may be used for the guide pipe.

According to a second aspect of the present invention, in the first aspect, the piston rod has a flat surface extending in the axial direction, and the regulating surface which is in close contact with the flat surface is formed in the sliding hole of the piston rod. It is characterized by. Therefore,
The regulating surface restrains the rotation of the piston rod.

A third aspect of the present invention is characterized in that, in the second aspect, the piston rod has a polygonal cross section, and its outer peripheral surface is the flat surface. The regulating surface corresponds to the outer surface of the member having such a polygonal cross section, thereby preventing rotation of the piston rod. The shaft member of polygonal cross section
In the case of a hexagon, it can be easily manufactured by a drawing method.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. First, an outline of the apparatus will be described with reference to FIG. 4. A large number of projection nuts are accommodated in a parts feeder 1, from which a parts supply pipe 2 extends. The component supply pipe 2 is connected to the guide pipe 3,
A temporary fixing chamber 4 for the projection nut is formed at a location where the two 2 and 3 intersect. A relay pipe 5 is connected to the guide pipe 3, and an air cylinder 6 is connected to an end of the relay pipe 5. The supply rod 7 is of a retractable type, and skews the projection nut temporarily locked in the temporary holding chamber 4 to supply the projection nut to the target location.

The projection nut is designated by the reference numeral 8. A steel plate part 10 is placed on the fixed electrode 9, and the projection nut 8 is attached to the guide pin 11 of the fixed electrode 9.
Screw holes are fitted. The movable electrode 12 corresponding to the fixed electrode 9 advances, and the pressurization is performed, so that the projection nut 8 is welded to the steel plate component 10.

Next, FIGS. 1 to 3 will be described.
The supply rod 7 is provided in the screw hole 1 of the projection nut 8.
The guide rod 14 which enters the inside 3, the sliding rod 15 having a diameter larger than this guide rod, the pushing surface 16 formed at the boundary between the guide rod 14 and the sliding rod 15, and the sliding rod 15 are slidable. It has a hollow shaft 17 that fits. As shown in FIG. 2, each of the guide tube 3, the hollow shaft 17, and the sliding rod 15 has a circular cross section. When the supply rod 7 advances and the guide rod 14 penetrates the screw hole 13 and the pushing surface 16 hits the end face of the nut 8, the nut 8 is forcibly pushed out and supplied to the guide pin 11 as shown in FIG. Is done.

An elongated hole 18 is formed in the hollow shaft 17 in the axial direction, and a stopper piece 19 fixed to the sliding rod 15 enters the elongated hole 18. Male thread 2 of piston rod 20
1 is screwed into the end of the hollow shaft 17, a coil spring 22 is inserted between the male screw 21 and the sliding rod 15,
The stopper piece 19 abuts on the lower end of the long hole 18 by its elasticity. With such a supply rod structure, when the operator's hand 23 is sandwiched between the guide rod and the projection nut as shown in FIG. Fifteen
Is pushed into the hollow shaft 17 to reduce the load on the hand to prevent injury.

The male screw 24 of the air cylinder 6 is screwed into the end of the relay tube 5 so that the air cylinder 6 and the relay tube 5 are firmly connected. A square shaft 25 having a hexagonal cross section is formed on the piston rod 20 and extends through the end member 26 of the air cylinder 6 into the air cylinder 6. A hexagonal through hole 27 is formed in the end member 26, and a square shaft 25 passes through the hole. A flat surface extending in the axial direction is formed on the piston rod 20, and a regulating surface that is in close contact with the flat surface is formed in a sliding hole of the piston rod 20. That is, the six outer surfaces of the square shaft 25 are the flat surfaces 28 and the through holes 27
Is a sliding hole. Six inner surfaces of the sliding holes are regulating surfaces 29. In FIG. 3, the gap between the square shaft 25 and the through hole 27 is exaggerated for easy understanding.

Although the square axis is a polygonal cross section such as a hexagon,
This is a circular cross-section axis, a plane is formed on a part of it,
A regulation surface for this may be provided.

A guide plate 30 is provided at the end of the temporary holding chamber 4.
Is fixed, and a magnet (permanent magnet) 31 is buried therein to temporarily lock the projection nut 8. Reference numeral 32 denotes a welding projection. The entire feeding device is firmly attached to a stationary member 34 via a fixing piece 33.

[0015]

According to the present invention, since the movement of the supply rod in the rotational direction is restrained at the piston rod portion of the air cylinder, the supply rod itself is easily manufactured using a normal circular pipe material. The guide tube can also be made of a circular pipe material. Therefore, it is possible to avoid making a long hole in the center of the elongated shaft as in the related art. In particular, when drilling a long hole, it is necessary to take extreme care so as not to shift the center, and to achieve extremely high precision.In the present invention, such a need is not required, and fabrication is simple and high precision is required. And very effective in reducing costs.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a sectional view taken along line (3)-(3) of FIG. 1;

FIG. 4 is a side view schematically showing the entire apparatus.

[Explanation of symbols]

 2 Parts supply pipe 3 Guide pipe 8 Projection nut 4 Temporary holding chamber 7 Supply rod 13 Screw hole 14 Guide rod 15 Sliding rod 16 Extruded surface 17 Hollow shaft 6 Air cylinder 20 Piston rod 28 Flat surface 29 Control surface 27 Sliding hole

Claims (3)

[Claims] 1. A temporary fixing chamber for a projection nut is formed at a position where a component supply pipe and its guide pipe intersect, a supply rod is provided for moving forward and backward in the guide pipe, and the supply rod is provided in a screw hole of the projection nut. A sliding rod having a larger diameter than the guide rod, an extruding surface formed at the boundary between the guide rod and the sliding rod, and a hollow shaft in which the sliding rod is slidably fitted. An air cylinder for moving a supply rod forward and backward is provided, and a piston rod of the air cylinder is configured to be unable to rotate. 2. The projection according to claim 1, wherein the piston rod has a flat surface extending in the axial direction, and a regulating surface in close contact with the flat surface is formed in a sliding hole of the piston rod. Nut feeding device. 3. The projection nut supplying device according to claim 2, wherein the piston rod has a polygonal cross section and an outer peripheral surface thereof is the flat surface.