WO2021049456A1

WO2021049456A1 - Supply rod for projection nut

Info

Publication number: WO2021049456A1
Application number: PCT/JP2020/033768
Authority: WO
Inventors: 青山　省司; 青山　好高
Original assignee: 青山　省司
Priority date: 2019-09-11
Filing date: 2020-09-07
Publication date: 2021-03-18
Also published as: JP6757921B1; JP2021041456A

Abstract

A stopper member and a restriction member are provided to a distal end of a supply rod, and an accommodation space is formed by one stopper surface, two restriction inner surfaces of the restriction member, and an inlet opening. A recessed part is provided to the stopper member, a receiving recess that receives a welding protrusion is formed, and an extension surface of the stopper surface is formed between two receiving recesses. A suction means that maintains adhesion of the outer-side surface of a nut to the stopper surface or to the extension surface is provided in a state in which a suction action and a suction-cancelling action can be performed.

Description

Supply rod for projection nut

The present invention relates to a supply rod for a projection nut. In the present invention, a storage space for receiving the projection nut is provided at the tip of the supply rod, the transferred projection nut is held at a predetermined position in the storage space, and the projection nut is supplied to the target location by advancing the supply rod. ..

Back technique

According to Japanese Patent Application Laid-Open No. 2006-136937, the transferred projection nut is temporarily held in the nut accommodating portion formed at the tip of the supply rod, and the supply rod is advanced to be supplied to the electric resistance welding electrode. Have been described. In the following description, the projection nut may be simply referred to as a nut.

FIGS. 3A to 3D show the prior art.

First, the projection nut to be supplied will be explained.

The projection nut 1 to be supplied is the same in both the prior art and the present invention. As shown in FIGS. 2A to 2C, the nut 1 is provided with screw holes 3 in the central portion of a square or other square nut body 2, and has welding protrusions 4 at four corners on one side of the nut body 2. It is formed. The outside of the nut body 2 is surrounded by four planar outer surfaces 5.

The welding projection 4 projects in both the diameter direction of the screw hole 3 and the axial direction of the screw hole 3. The dimension D shown in FIG. 2B indicates the protruding length in the diametrical direction, and the dimension H shown in FIG. 2C indicates the protruding length in the central axis direction.

Next, the conventional technique of the nut supply rod will be described.

As the nut supply device 100, various types such as one in which the supply rod is moved forward and backward by an air cylinder and one in which the feed rod is moved forward and backward by an advance / retreat output type electric motor are adopted. Here, it is an air cylinder type.

As clearly described in FIG. 3B, the stopper member 8 is formed with a stopper surface 7 for receiving the transferred nut 1 at the tip of the advancing / retreating actuating type supply rod 6, and on both sides of the stopper member 8. A regulating member 9 is provided so as to be arranged and face the outer surface 5 of the nut 1 to regulate the displacement movement of the nut 1. Further, it is accommodated by one stopper surface 7 corresponding to the three outer surfaces 5 of the nut 1, the regulation inner surface 10 of the two regulation members 9, and the inlet opening portion 11 formed at the tip portions of both regulation members 9. Space 12 is formed.

As shown in FIG. 3A, the supply rod 6 is housed in the outer cylinder 14, and moves forward and backward by the air cylinder 15 coupled to the end thereof. The piston rod 16 of the air cylinder 15 is coupled to the supply rod 6.

The parts supply passage 17 is composed of a metal pipe 18 having a rectangular cross section, and is designed to convey a rectangular nut 1. Although not shown, the metal tube 18 is connected to a synthetic resin supply hose extending from the parts feeder. The tip of the metal pipe 18 that feeds the nut 1 is welded to the outer cylinder 14. The nut 1 is transferred by sliding on the bottom surface 18A of the metal tube 18. The end of the metal tube 18 opens in the immediate vicinity of the tip of the supply rod 6, the inlet opening 11 of the accommodation space 12 faces this opening, and the nut 1 from the metal tube 18 is smooth. It is possible to enter the accommodation space 12.

The width of the entrance opening portion 11 is set to be larger than the width of the nut 1, so that the nut 1 can smoothly enter the accommodation space 12. Therefore, gaps are formed on the left and right sides of the nut 1.

Opposite to the inlet opening 11 in order to move the nut 1 from the component supply passage 17 toward the inside of the accommodation space 12 more smoothly and to prevent the nut 1 from shifting in the accommodation space 12. A permanent magnet 19 is installed on the side.

As shown by the alternate long and short dash line in FIG. 3A, in order for the supply rod 6 to advance and bring the nut 1 to the target location, the attractive force of the permanent magnet 19 on the nut 1 must be extinguished. The configuration for realizing this will be described. The supply rod 6 has a double structure including a hollow shaft 21 and an inner shaft 22 inserted in the hollow shaft 21 in a slidable state, and a regulation pin 23 is fixed to the inner shaft 22 and the regulation pin 23 is fixed to the inner shaft 22. The 23 is projected to the outside through the elongated hole 24 in the stroke direction formed in the hollow shaft 21. The elasticity of the coil spring 25 inserted into the hollow shaft 21 acts on the inner shaft 22, whereby the regulation pin 23 hits the lower end of the elongated hole 24.

The permanent magnet 19 is installed in a state of being embedded in the sliding piece 26, and the sliding piece 26 is integrated with the inner shaft 22 by a bolt 28 penetrating the elongated hole 27 formed in the hollow shaft 21.

On the other hand, an air cylinder 29 is fixed to the outer surface of the outer cylinder 14, and a locking piece 32 is coupled to the piston rod 31 thereof. The locking piece 32 penetrates an elongated hole 33 formed in the outer cylinder 14 in the stroke direction and projects into the outer cylinder 14. The relative positions of the two are set so that the regulation pin 23 stops immediately before the locking piece 32 when the supply rod 6 advances.

A notch 34 is provided in the outer cylinder 14 to prevent the sliding piece 26 from interfering with the outer cylinder 14. In the example shown in FIG. 3, the target location where the nut 1 can reach is the steel plate component 35 of the other party to be projected welded. The steel plate component 35 is placed on the fixed electrode 36, and a guide pin 37 provided on the fixed electrode 36 penetrates the steel plate component 35. Further, in order to exert a stronger magnetic force on the nut 1, it is appropriate that the hollow shaft 21, the inner shaft 22, the sliding piece 26 and the like are made of a material such as stainless steel which is a non-magnetic material.

Next, the operation of the nut supply device will be described.

When the nut 1 is attracted and held by the permanent magnet 19 at the tip of the supply rod 6, the nut 1 is housed in the storage space 12 and is securely held by the tip of the supply rod 6.

The supply rod 6 advances with the output of the air cylinder 15. At this time, the nut 1 is still held in the accommodation space 12 by the permanent magnet 19. When the nut 1 comes just before the guide pin 37, the advance of the supply rod 6 is stopped. Then, when the locking piece 32 is pulled up by the air cylinder 29, the displacement is transmitted to the sliding piece 26 via the regulation pin 23, the inner shaft 22, and the bolt 28, and the permanent magnet 19 is pulled up from the nut 1. Be kept away. Therefore, the suction force for the nut 1 disappears, and the nut 1 falls toward the guide pin 37 of the fixed electrode 36.

When the nut supply is completed as described above, the supply rod 6 returns to the position shown by the solid line in FIG. 3 to prepare for the next nut reception. In addition, in relation to surrounding obstacles, the above supply rod 6 may be further laid down and arranged in a substantially horizontal direction.

Japanese Unexamined Patent Publication No. 2006-136937

In the technique described in Patent Document 1, as shown in FIG. 3B, a U-shaped member protrudes from the tip of the supply rod 6 to temporarily hold the nut 1 in a state of surrounding the nut 1. It is carried out. Here, the outer surface 5 of the nut 1 and the welding projection 4 face the stopper surface 7 and both regulated inner surfaces 10. Since the welding projection 4 has the above-mentioned protrusion lengths D and H, the nut 1 received by the stopper surface 7 is in an inclined state as shown in FIG. 3C or FIG. 3D. That is, a gap is formed between the outer surface 5 of the nut 1 and the stopper surface 7.

When the first nut 1 that has entered the accommodation space 12 is tilted in the direction shown in FIG. 3C, the welding protrusion 4 on the left side of the first nut 1 rises, so that the welding protrusion of the subsequent nut 1 in the metal tube 18 is raised. A phenomenon occurs in which 4 enters the lower side of the welding projection 4 of the frontmost nut 1. Since the position of the bottom surface 18A of the metal tube 18 is set to a position where the nut 1 can smoothly enter the accommodation space 12, the position where the welding projection 4 of the foremost nut 1 is higher than the position of the bottom surface 18A. If it floats on the surface, the above-mentioned phenomenon of the trailing nut 1 entering occurs.

That is, as shown in FIG. 3C, since the welding projection 4 of the foremost nut 1 that has entered the accommodation space 12 abuts on the stopper surface 7, the foremost nut 1 is inclined so that the left side is raised. .. As a result, the left welding projection 4 rises to a high position, so that the welding projection 4 of the succeeding nut 1 can easily enter the lower side of the welding projection 4 of the earliest nut 1. If the supply rod 6 advances in this state, the frontmost nut 1 interferes with the succeeding nut 1 and smooth nut supply becomes impossible.

Further, when the frontmost nut 1 is tilted in the direction shown in FIG. 3D, the welding protrusion 4 on the left side of the frontmost nut 1 is lowered, so that the welding protrusion 4 of the succeeding nut 1 in the metal tube 18 is the frontmost nut 1. The phenomenon of riding on the upper side of the welding projection 4 of the above occurs. Since the position of the bottom surface 18A of the metal tube 18 is set to a position where the nut 1 can smoothly enter the accommodation space 12, the position where the welding projection 4 of the foremost nut 1 is lower than the position of the bottom surface 18A. When it descends to, the above-mentioned phenomenon of the trailing nut 1 riding on the nut 1 occurs.

That is, as shown in FIG. 3D, the foremost nut 1 that has entered the accommodation space 12 is inclined so that the right side is raised because the welding projection 4 abuts on the stopper surface 7. .. As a result, the left welding projection 4 descends to a lower position, so that the welding projection 4 of the second nut 1 can easily ride on the upper side of the welding projection 4 of the first nut 1. If the supply rod 6 advances in this state, the upper end corner of the outer surface 5 of the frontmost nut 1 interferes with the welding projection 4 of the succeeding nut 1, and smooth nut supply becomes impossible.

The present invention has been provided to solve the above problems, and an object of the present invention is to improve the holding posture of the projection nut and to smoothly supply the nut.

According to one aspect of the present invention, the projection nut to be supplied protrudes from the nut body at the four corners of the square nut body having screw holes in both the diameter direction and the axial direction of the screw holes. There is a welding protrusion,
A stopper member having a stopper surface formed at the tip of the supply rod to receive the transferred projection nut and a stopper member arranged on both sides of the stopper member to regulate the displacement movement of the projection nut facing the outer surface of the projection nut. A regulating member is provided, and the one stopper surface and the two regulating inner surfaces corresponding to the three outer surfaces of the projection nut, and the inlet opening portion formed at the tip of both the regulating members are provided. A containment space is formed,
Recessed recesses are provided on both sides of the stopper member on the tip end side to form a receiving recess for receiving the welding projection.
An extension surface of the stopper surface is formed between the two receiving recesses, and the outer surface of the projection nut is configured to be in close contact with the stopper surface and the extension surface.
A suction means for maintaining the close contact of the outer surface of the projection nut with respect to the stopper surface and the extension surface is provided so that the suction operation and the suction release operation can be performed.

A stopper member having a stopper surface formed at the tip of the supply rod to receive the transferred projection nut, and a regulation member arranged on both sides of the stopper member to regulate the displacement movement of the nut facing the outer surface of the nut. And are provided, and a storage space is formed by one stopper surface corresponding to the three outer surfaces of the nut, the regulation inner surface of the two regulation members, and the inlet opening portion formed at the tip of both regulation members. ing. Then, concave portions are provided on both sides of the tip side of the stopper member to form a receiving recess for receiving the welding protrusion, and an extension surface of the stopper surface is formed between both receiving recesses so that the outer surface of the nut is formed. A suction means is provided so as to be in close contact with the stopper surface and the extension surface, and further, a suction means for maintaining the close contact of the outer surface of the nut with respect to the stopper surface and the extension surface is provided so that the suction operation and the suction release operation can be performed.

For the nut that has passed through the entrance opening and entered the accommodation space, two welding protrusions are accommodated in the receiving recess, and one outer surface of the nut is in close contact with the stopper surface and the extension surface. Therefore, the screw hole axis is coaxial with the supply rod, and the outer surface of the nut is parallel to the screw hole axis, so that the holding posture of the entire nut is not inclined with respect to the axis of the supply rod.

Therefore, the earliest nut that is correctly held in the accommodation space will also have the correct stop position for its welding protrusion. Since the correct stop position of such a welding protrusion is ensured, the welding protrusion of the succeeding nut may enter the lower side of the welding protrusion of the earliest nut, or the welding protrusion of the succeeding nut may be the front nut. The frontmost nut does not run on the upper side of the welding protrusion and does not make abnormal contact with the succeeding nut, and is smoothly delivered when the supply rod advances. That is, when the front nut does not have an inclined posture, the welding protrusion of the front nut and the welding protrusion of the succeeding nut can be butted without any height difference, so that the welding protrusion of the succeeding nut is the best. No more abnormal interference with the welding protrusion of the tip nut.

Since concave portions are provided on both sides on the tip side of the stopper member to form a receiving recess for receiving the welding protrusion, the welding protrusion that has entered the receiving recess fulfills the nut positioning function. Therefore, the amount of misalignment of the nut can be reduced, and the relative position between the nut and the supply rod can be maintained accurately. Further, even if the welding projection is excessively moved in the receiving recess for some reason, the outer surface of the nut is received by the two regulating members, so that it is possible to prevent the nut from being abnormally displaced.

Since the extension surface is configured so as to be continuous with the stopper surface, a large receiving area is secured for the outer surface of the nut that has entered the accommodation space, and the surface pressure at the time of receiving is reduced and indentations are generated on the receiving surface. It can be avoided.

As shown in FIGS. 3C and 3D, when the welding protrusion of the foremost nut hits the stopper surface, the entire foremost nut is in an inclined posture. When the inclination direction is the direction shown in FIG. 3C, the welding protrusion on the inlet opening side of the frontmost nut is in a raised position, so that the welding protrusion of the succeeding nut enters the lower side of the welding protrusion of the frontmost nut. The phenomenon occurs. When the inclination direction is the direction shown in FIG. 3D, the welding projection on the opening side of the inlet of the foremost nut is in a lowered position, so that the welding projection of the succeeding nut rides on the upper side of the welding projection of the foremost nut. Occurs. When the supply rod advances with the welding protrusion of the succeeding nut in the posture shown in FIGS. 3C and 3D, the welding protrusion of the foremost nut is caught on the upper side of the welding protrusion of the succeeding nut, and the smooth supply rod. It becomes impossible to advance. Alternatively, the upper corner of the outer surface of the frontmost nut is caught by the welding projection of the succeeding nut, which also makes it impossible for the supply rod to smoothly advance. By avoiding the inclination of the nut in the accommodation space, such inconvenience is prevented.

It is sectional drawing of the tip part of a supply rod and the tip part of a metal tube. It is a side view seen from the inlet opening part side of a supply rod. It is a side view which shows the region of a stopper surface and an extension surface. It is a perspective view of a nut. It is a top view of a nut. It is a side view of a nut. It is sectional drawing which shows the conventional nut supply device. It is a perspective view which shows the tip part of the supply rod. It is sectional drawing which shows the abnormal posture of a nut. It is sectional drawing which shows the abnormal posture of another nut.

Next, a mode for implementing the projection nut supply rod of the present invention will be described.

In the embodiment of the present invention, the structure for holding the nut 1 at the tip of the supply rod 6 is improved, and the other structures are the same as those shown in FIGS. 2 and 3 described above. Therefore, the description of this embodiment describes the shape of the tip portion of the supply rod 6 shown in FIG. 1, and the other configurations refer to the matters described according to FIGS. 2A to 2C and FIGS. 3A to 3D.

Concave portions are provided on both sides of the tip side of the stopper member 8 to form a receiving recess 39 for receiving the welding projection 4, an extension surface 7A of the stopper surface 7 is formed between the receiving

recesses

39 and 39, and a nut. The outer surface 5 of 1 is configured to be in close contact with the stopper surface 7 and the extension surface 7A. The regions of the stopper surface 7 and the extension surface 7A are shown in FIG. 1C.

A suction means for maintaining the close contact of the outer surface 5 of the nut 1 with respect to the stopper surface 7 and the extension surface 7A is provided. Here, it is a permanent magnet 19. The permanent magnet 19 is in a state where it can perform a suction operation and a suction release operation by moving the inner shaft 22 forward and backward. Instead of the permanent magnet 19, the nut can be held by an air suction type.

The position of the end of the bottom surface 18A of the metal pipe 18, that is, the relative position between the open end of the component supply passage 17 and the welding projection 4 of the nut 1 in which the outer surface 5 is in close contact with the stopper surface 7 is appropriately set. There is. That is, the welding projection 4 of the earliest nut 1 held in the accommodation space 12 in a normal state and the subsequent (second) nut 1 in which the welding projection 4 is in contact with the bottom surface 18A of the metal tube 18. The position of the bottom surface 18A is set so that the welding projection 4 of the above surface faces the welding projection 4 without any height difference.

The position of the permanent magnet 19 is arranged slightly diagonally above the accommodation space 12, and the outer surface 5 of the nut 1 is in close contact with the stopper surface 7 and the extension surface 7A, and at the same time, the upper surface of the nut 1 is also on the ceiling surface of the accommodation space 12. It is desirable to make them adhere to each other. By achieving such close contact with the ceiling surface, the accuracy of the holding position of the nut 1 is improved, and a more reliable nut supply is realized.

Note that FIG. 1A shows a cross section taken along the line AA in FIG. 1B.

The advancing / retreating operation of the supply rod is performed by the above-mentioned air cylinder, but it is also possible to use an advancing / retreating output type electric motor instead of the air cylinder. Further, if the permanent magnet 19 is replaced with an electromagnet, movable mechanisms such as an air cylinder 29, an inner shaft 22, and a hollow shaft 21 can be eliminated.

The above-mentioned advance / retreat operation of the supply rod and the advance / retreat operation of the permanent magnet can be easily performed by a generally adopted control method. A predetermined operation can be ensured by combining an air switching valve that operates with a signal from a control device or a sequence circuit, a sensor that emits a signal at a predetermined position of an air cylinder and transmits the signal to the control device, and the like.

The effects of the examples described above are as follows.

A stopper member 8 having a stopper surface 7 formed at the tip of the supply rod 6 for receiving the transferred projection nut 1 and a nut 1 arranged on both sides of the stopper member 8 facing the outer surface 5 of the nut 1. A regulating member 9 for restricting the displacement of the nut 1 is provided, and one stopper surface 7 and the regulating inner surface 10 of the two regulating members 9 corresponding to the three outer surfaces 5 of the nut 1 and the tip portions of both regulating members 9 are provided. The accommodation space 12 is formed by the entrance opening portion 11 formed in the above. Then, concave portions are provided on both sides of the stopper member 8 on the tip end side to form a receiving recess 39 for receiving the welding projection 4, and an extension surface 7A of the stopper surface 7 is formed between both receiving recesses 39. , The outer surface 5 of the nut 1 is configured to be in close contact with the stopper surface 7 and the extension surface 7A. Further, a suction means for maintaining the close contact of the outer surface 5 of the nut 1 with respect to the stopper surface 7 and the extension surface 7A, that is, a permanent magnet 19, is provided in a state where the suction operation and the suction release operation can be performed.

In the nut 1 that has passed through the inlet opening portion 11 and entered the accommodation space 12, two plastic welding protrusions 4 are accommodated in the receiving recess 39, and one outer surface 5 thereof is formed on the stopper surface 7 and the extension surface 7A. In close contact. Therefore, the screw hole axis is coaxial with the supply rod 6, and the outer surface 5 of the nut 1 is parallel to the screw hole axis, so that the holding posture of the entire nut is not inclined with respect to the axis of the supply rod 6. ..

Therefore, the foremost nut 1 correctly held in the accommodation space 12 also stops at the correct position for the welding projection 4. Since the correct stop position of the welding protrusion 4 is ensured, the welding protrusion 4 of the succeeding nut 1 may enter the lower side of the welding protrusion 4 of the foremost nut 1, or the succeeding nut 1 may be welded. The protrusion 4 does not ride on the upper side of the welding protrusion 4 of the frontmost nut 1, and the frontmost nut 1 does not make abnormal contact with the succeeding nut 1 and is smoothly delivered when the supply rod 6 advances. .. That is, when the frontmost nut 1 is not tilted, the welding protrusion 4 of the frontmost nut 1 and the welding protrusion 4 of the succeeding nut 1 can be butted against each other without any height difference. The welding protrusion 4 of the above does not abnormally interfere with the welding protrusion 4 of the frontmost nut 1. For this purpose, it is necessary to appropriately select the relative position between the bottom surface 18A of the metal pipe 18 and the ceiling surface 12A of the accommodation space 12.

Since concave portions 39 are provided on both sides of the stopper member 8 on the tip side to receive the welding protrusions 4, the welding protrusions 4 that have entered the receiving recesses 39 perform the positioning function of the nut 1. .. Therefore, the amount of misalignment of the nut 1 can be reduced, and the relative positions of the nut 1 and the supply rod 6 can be accurately maintained. Further, even if the welding projection 4 moves excessively in the receiving recess 39 for some reason, the outer surface 5 of the nut 1 is received by the two regulating members 9, so that the nut 1 is abnormally misaligned. Can be prevented.

Since the extension surface 7A is configured in a state of being continuous with the stopper surface 7, a wide receiving area for the outer surface 5 of the foremost nut 1 that has entered the accommodation space 12 is secured, and the surface pressure at the time of receiving is reduced. It is possible to avoid the generation of indentations on the receiving surface. Therefore, the durability of the supply rod is remarkably improved.

As shown in FIGS. 3C and 3D, when the welding projection 4 of the foremost nut 1 hits the stopper surface 7, the entire foremost nut 1 is in an inclined posture. When the inclination direction is the direction shown in FIG. 3C, the welding projection 4 on the inlet opening portion 11 side of the foremost nut 1 is in a raised position, so that the welding projection 4 for the succeeding nut 1 is welded to the foremost nut 1. A phenomenon occurs in which the protrusion 4 enters the lower side. When the inclination direction is the direction shown in FIG. 3D, the welding projection 4 on the inlet opening portion 11 side of the foremost nut 1 is in a lowered posture, so that the welding projection 4 for the succeeding nut 1 is welded to the foremost nut 1. A phenomenon occurs in which the protrusion 4 rides on the upper side. When the supply rod 6 advances while the welding projection 4 of the succeeding nut 1 is in the posture shown in FIGS. 3C and 3D, the welding projection 4 of the foremost nut 1 moves above the welding projection 4 of the succeeding nut 1. If it gets caught, the supply rod 6 cannot smoothly advance. Alternatively, the upper corner portion of the outer surface 5 of the frontmost nut 1 is caught by the welding projection 4 of the succeeding nut 1, which also makes it impossible for the supply rod 6 to smoothly advance. By avoiding the inclination of the frontmost nut 1 in the accommodation space 12, such inconvenience is prevented.

As described above, the supply rod of the present invention is provided with receiving recesses for welding protrusions on both sides on the tip end side of the stopper member, and an extension surface of the stopper surface is provided between both receiving recesses to hold the projection nut. It can be used in a wide range of industrial fields such as the body welding process of automobiles and the sheet metal welding process of household electrical appliances.

1 Projection nut 2 Nut body 3 Screw hole 4 Welding protrusion 5 Outer side surface 6 Supply rod 7 Stopper surface 7A Extension surface 8 Stopper member 9 Regulatory member 10 Regulatory inner surface 11 Entrance opening 12 Storage space 19 Permanent magnet 39 Receiving recess 100 Nut supply Device D Protrusion length in the radial direction H Protrusion length in the axial direction

Claims

The projection nut to be supplied is provided with welding protrusions protruding from the nut body in both the diameter direction and the axial direction of the screw holes at the four corners of the square nut body having screw holes.
A stopper member having a stopper surface formed at the tip of the supply rod to receive the transferred projection nut and a stopper member arranged on both sides of the stopper member to regulate the displacement movement of the projection nut facing the outer surface of the projection nut. A regulating member is provided, and the one stopper surface and the two regulating inner surfaces corresponding to the three outer surfaces of the projection nut, and the inlet opening portion formed at the tip of both the regulating members are provided. A containment space is formed,
Recessed recesses are provided on both sides of the stopper member on the tip end side to form a receiving recess for receiving the welding projection.
An extension surface of the stopper surface is formed between the two receiving recesses, and the outer surface of the projection nut is configured to be in close contact with the stopper surface and the extension surface.
A supply rod for a projection nut, characterized in that a suction means for maintaining close contact of the outer surface of the projection nut with respect to the stopper surface and the extension surface is provided so that a suction operation and a suction release operation can be performed.