JP2020172012A - Supply rod and supply method for cap nut - Google Patents

Abstract

To securely supply a fixed-electrode guide pin to a cap nut held by a supply rod, by using both arcuate trajectory movement and frictional movement to a supply-rod leading end.SOLUTION: In order that a cap nut 1 including a nut body 2 and a cover body 4 is supplied to a guide pin 7 of a fixed electrode 6 for electric resistance welding, a holding recess 36 is formed at an end of an inclined supply rod 14, and formed in the holding recess 36 are a main holding surface 38 surrounding the nut body 2, a sub-holding surface 39 surrounding the cover member 4, and a passage notch 42 for movement of the cap nut 1. A permanent magnet 16 for holding the cap nut 1 in the holding recess 36 is provided in the supply rod 14 so as to be movable forward/backward. The supply rod 14 stops forward movement and, at almost the same time as the stop, attracting force of the permanent magnet 16 dissipates. Due to this dissipation, the cap nut 1 moves while drawing an arcuate trajectory in a vertical direction. At the same time as this movement, the nut body 2 moves while causing friction between a leading-end corner S of a wall member 37 and itself.SELECTED DRAWING: Figure 3

Description

The present invention relates to a bag nut in which a hemispherical cover member is coupled to a nut body having a screw hole, and is supplied to a guide pin of a fixed electrode for electric resistance welding.

Japanese Unexamined Patent Publication No. 2006-136937 describes that a supply rod in an inclined posture holding a projection nut is advanced and supplied to a guide pin of a fixed electrode while drawing an arc locus on the nut.

Japanese Unexamined Patent Publication No. 2006-136937

The technique described in the above patent document supplies a nut alone, and is not suitable for supplying a bag nut in which a hemispherical cover member is coupled to a nut body. If the nut is a single unit, the position of the center of gravity is low, so the nut is supplied to the guide pin of the fixed electrode while drawing an arc locus reliably. However, if the shape is like the bag nut, it is difficult to reliably draw the arc locus because the position of the center of gravity is high.

The present invention has been provided to solve the above-mentioned problems, and is adapted to the characteristics of the shape of the bag nut to move the arc trajectory to the bag nut held by the supply rod and to the tip of the supply rod. The purpose is to reliably supply the guide pin of the fixed electrode by using rubbing movement together.

The invention according to claim 1 is a supply rod for a bag nut.
A cap nut with a screw hole on one side of the nut body and a hemispherical cover member bonded to the other side is supplied to the guide pin of the fixed electrode for electric resistance welding.
A holding recess for accommodating the bag nut is formed at the tip of the advancing / retreating operation type supply rod arranged in an inclined posture.
In the holding recess, a main holding surface formed by a wall member surrounding the nut body and a sub holding surface surrounding the hemispherical portion of the cover member are formed.
The passage notch that the cap nut passes through when transitioning from the supply rod to the guide pin is formed in a state of being open on the lateral side surface opposite to the inclination direction of the supply rod, and is hemispherical in the cover member. It has an arc-shaped cover member passing portion through which the portion passes and a nut body passing portion through which the nut body passes.
A permanent magnet that maintains a state in which the outer portion of the nut body is in contact with the main holding surface and the hemispherical portion of the cover member is in contact with the sub-holding surface is provided on the supply rod in a state in which it can advance and retreat.
When the supply rod advances, the advance of the supply rod is stopped at the position where the screw hole is just before the guide pin or the tip of the guide pin is slightly inserted into the screw hole, and the advance of the supply rod is stopped almost at the same time as the stop, and it is permanent to the bag nut. The attractive force of the magnet is extinguished, and due to this extinction, the bag nut in the inclined posture moves while drawing an arc locus in the vertical direction, and at the same time, the outer surface of the nut body rubs against the tip corner of the wall member. It is characterized by moving while moving.

When the supply rod advances, the advance of the supply rod is stopped when the screw hole is just before the guide pin or when the tip of the guide pin is slightly inserted into the screw hole, and the permanent magnet for the cap nut is stopped almost at the same time as the stop. The suction force of the nut disappears, and due to this disappearance, the bag nut in the inclined posture moves while drawing an arc trajectory in the vertical direction, and at the same time, the outer surface of the nut body moves while rubbing against the tip corner of the wall member. To do.

In this way, the movement of the cap nut in an arc trajectory and the outer surface of the nut body rubbing against the tip corner of the wall member are performed at the same time, so that as the rubbing movement progresses, the outside of the nut body Since the contact point between the side surface and the tip corner of the wall member is relatively close to the position of the center of gravity of the bag nut, the arc displacement of the bag nut around the contact point is smoothly performed, and the screw hole is fitted to the guide pin. The match is definitely achieved.

When the thickness of the cover member is reduced to reduce its mass and the position of the center of gravity approaches the nut body side, the position of the center of gravity is the wall member when viewed in the direction of the central axis of the supply rod due to the progress of the rubbing movement. It will be in a state where it is located in front of the tip corner of. In such a case, the arc displacement of the cap nut is more likely to be promoted, and the supply to the guide pin is ensured.

If the outer surface of the nut body does not move while rubbing against the tip corner of the wall member, the distance between the tip corner of the wall member and the center of gravity of the bag nut becomes large, and therefore the bag nut is moved vertically. The force component to be moved by the arc motion becomes small, and the bag nut is less likely to fall from the holding recess. However, while the bag nut is displaced toward the vertical posture, the rubbing displacement is combined, so that the posture change of the bag nut in the arc direction is promoted. That is, since the distance between the tip corner of the wall member and the position of the center of gravity of the bag nut is reduced, the posture of the bag nut in the arc direction is likely to change.

Since the position of the center of gravity of the bag nut is displaced toward the cover member side, the holding stability of the bag nut in the holding recess is lowered. However, the holding recess is mainly formed of a wall member surrounding the nut body. A holding surface and a sub-holding surface surrounding the hemispherical portion of the cover member are formed, and the holding of the outer surface of the nut body by the main holding surface and the holding of the cover member by the sub-holding surface are the attractive forces of the permanent magnet. It is secured at. Therefore, even if the position of the center of gravity of the bag nut is offset to the cover member side, the bag nut does not shift in the holding recess when the supply rod advances, and the bag nut is reliably held in the holding recess and supplied. Stable operation of the rod can be achieved. In particular, since the nut body and the cover member are held at two locations, the main holding surface and the sub holding surface, the holding stability of the bag nut is improved. Further, when the inclination angle of the supply rod approaches the vertical direction, the bag nut can easily escape from the holding recess, but by holding the above two points, the nut can be stably held even if the inclination angle of the supply rod changes. Is done.

The passage notch that the cap nut passes through when transitioning from the supply rod to the guide pin is formed in a state of being open on the lateral side surface opposite to the inclination direction of the supply rod, and the hemispherical portion of the cover member is formed. It has an arc-shaped cover member passing portion through which the nut body passes, and a nut body passing portion through which the nut body passes. Therefore, when the bag nut moves toward the guide pin side with the arc movement, the cover member surely passes through the cover member passing portion, and the operation stability is ensured. In particular, since the outer surface of the nut body shifts with respect to the tip corner portion of the wall member, the cover member does not interfere with the passing portion of the cover member, and a reliable supply operation can be obtained.

The invention according to claim 2 is a method for supplying a bag nut.
A cap nut with a screw hole on one side of the nut body and a hemispherical cover member bonded to the other side is supplied to the guide pin of the fixed electrode for electric resistance welding.
A holding recess for accommodating the bag nut is formed at the tip of the advancing / retreating operation type supply rod arranged in an inclined posture.
In the holding recess, a main holding surface formed by a wall member surrounding the nut body and a sub holding surface surrounding the hemispherical portion of the cover member are formed.
The passage notch that the cap nut passes through when transitioning from the supply rod to the guide pin is formed in a state of being open on the lateral side surface opposite to the inclination direction of the supply rod, and is hemispherical in the cover member. It has an arc-shaped cover member passing portion through which the portion passes and a nut body passing portion through which the nut body passes.
A supply rod provided with a permanent magnet that maintains a state in which the outer portion of the nut body is in contact with the main holding surface and the hemispherical portion of the cover member is in contact with the sub-holding surface is prepared.
When the supply rod advances, the advance of the supply rod is stopped at the position where the screw hole is just before the guide pin or the tip of the guide pin is slightly inserted into the screw hole, and the advance of the supply rod is stopped almost at the same time as the stop, and it is permanent to the bag nut. The attractive force of the magnet is extinguished, and due to this extinction, the bag nut in the inclined posture moves while drawing an arc locus in the vertical direction, and at the same time, the outer surface of the nut body rubs against the tip corner of the wall member. It is characterized by moving while moving.

The effect of the invention of the supply method is the same as the effect of the invention of the supply rod described above.

It is sectional drawing of the whole feeding device and each part. It is sectional drawing of each part of a supply rod. It is sectional drawing which shows the operation order.

Next, a form for carrying out the bag nut supply rod and the supply method of the present invention will be described.

1 to 3 show examples of the present invention.

First, the bag nut will be described.

As shown in FIGS. 1C and 1D, the iron bag nut 1 has a screw hole 3 opened on one side of the nut body 2 and a hemispherical cover member 4 is integrated on the other side. The cover member 4 is formed by pressing a steel plate, and is welded to the end face of the nut body 2. The portion painted in black is the welded portion 5.

A guide pin 7 is provided on the fixed electrode 6 of electric resistance welding in a protruding state, and the guide pin 7 protrudes from a prepared hole 9 of a steel plate component 8 on which the guide pin 7 is placed. When the bag nut 1 is supplied to the guide pin 7 by the supply device 100 described later, the small diameter portion 10 of the guide pin 7 relatively enters the screw hole 3, and the opening edge of the screw hole 3 is the tapered portion of the guide pin 7. It is received by the tapered surface of 11. The movable electrode that moves forward and backward arranged coaxially with the fixed electrode 6 is not shown.

As shown in FIG. 1C, the position of the center of gravity of the nut body 2 alone is G1 on the nut center axis and exists at a low position. On the other hand, when the cover member 4 is in the form of an integrated bag nut 1, the position of the center of gravity thereof is displaced toward the cover member 4. The position of the center of gravity is indicated by reference numeral G2. That is, the center of gravity G2 is a high place. The position of the center of gravity G2 can be displaced toward the nut body 2 side by reducing the thickness of the steel plate of the cover member 4 to reduce the mass.

Next, the supply device will be described.

The supply device 100 functions to feed the bag nut 1 to the guide pin 7 by advancing and retreating the supply rod 14 holding the bag nut 1 at the tip end portion. The entire supply device 100 is tilted so that the supply rod 14 is tilted with respect to the vertical direction.

The supply rod 14 is housed in an outer cylinder 17 having a circular cross section, and its upper end is coupled to a piston rod 19 of an air cylinder 18 fixed to the outer cylinder 17. When the supply rod 14 advances by a predetermined length, the suction force on the bag nut 1 is substantially extinguished. A mechanism for that is adopted. The outer cylinder 17 is fixed to a stationary member 15 such as a machine frame.

As the attractive force for the bag nut 1, various types such as a structure using a vacuum vacuum or an electromagnet can be adopted. Here, the method is to move the permanent magnet forward and backward with the shaft member.

That is, the supply rod 14 is composed of a hollow shaft 20 and an inner shaft 21 slidably inserted therein. The regulation pin 22 fixed near the upper end of the inner shaft 21 passes through the elongated hole 23 formed in the hollow shaft 20 in the stroke direction and protrudes into the space inside the outer cylinder 17. An air cylinder 24 is fixed to the outer peripheral surface of the outer cylinder 17, and an engaging piece 26 is coupled to the piston rod 25. The engaging piece 26 is formed from an elongated hole 27 formed in the outer cylinder 17 in the stroke direction. It protrudes into the outer cylinder 17.

The tension of the compression coil spring 28 inserted into the hollow shaft 20 acts on the inner shaft 21, whereby the regulation pin 22 is pressed against the lower end of the elongated hole 23. In this state, a holding recess, which will be described later, is formed at the tip portions of the hollow shaft 20 and the inner shaft 21.

When the supply rod 14 advances over a predetermined length by the operation of the air cylinder 18, the relative positions of the two are set so that the regulation pin 22 stops immediately before the engaging piece 26.

The permanent magnet 16 is embedded in the tip of the inner shaft 21. The inner shaft 21 is retracted to eliminate the suction force on the bag nut 1.

It is desirable that the inner shaft 21, the hollow shaft 20, and the like are made of stainless steel, which is a non-magnetic material, in order to exert a stronger attractive force on the bolt 1 of the permanent magnet 16. As shown in FIG. 1B, the supply rod 14 has an oval-shaped cross-sectional shape in which two parallel flat surfaces 30 are formed, and is slidable in close contact with the flat surfaces 30 to suppress the rotation of the supply rod 14. The piece 31 is fixed to the inner surface of the outer cylinder 17 by bolting or the like.

The parts supply pipe 33 that guides the bag nut 1 from the parts feeder (not shown) extends from a direction orthogonal to the stroke direction of the supply rod 14.

A permanent magnet 33 is arranged at the end of the outer cylinder 17 in order to draw the bag nut 1 from the component supply pipe 33 to the supply rod 14. The permanent magnet 34 is housed in a container 35, and the container 35 is welded to the end of the outer cylinder 17.

Next, the holding recess will be described.

In the holding recess 36 for accommodating the bag nut 1, the inner surface forming the holding recess 36 surrounds the main holding surface 38 formed by the wall member 37 surrounding the nut body 2 and the hemispherical portion of the cover member 4. A holding surface 39 is formed. The outer portion of the nut body 2 is composed of six outer surfaces and six corner portions of the hexagonal nut body 2. When the nut body 2 is surrounded by the main holding surface 38, as shown in FIG. 2B, the square lines of the nut body 2 are in contact with the main holding surface 38 at four points, or the square lines and the main body 2 are in contact with each other. There is a slight gap between the holding surfaces 38.

The inner surface of the sub-holding surface 39 is a spherical concave surface 40 such that the hemispherical portion of the cover member 4 is in close contact with the cover member 4. In line with this, as shown in FIG. 3D, the end surface of the inner shaft 21 is also a concave surface 41.

Note that in FIG. 3, hatching of the cross-sectional portion is not shown for easy viewing.

Next, the passage notch will be described.

A passage notch 42 shown in FIG. 2D is provided so that the bag nut 1 enters the holding recess 36 from the component supply pipe 33 and is sent out from the holding recess 36 toward the guide pin 7. As shown in FIGS. 2 (A) and 3 (D), the passage notch 42 is formed in a state of being open on the lateral side surface (plane 30) opposite to the inclination direction of the supply rod 14, and supplies the rod 14. When the rod 14 is most retracted, it faces the outlet portion of the component supply pipe 33.

The passage notch 42 has an arc-shaped cover member passing portion 43 through which the hemispherical portion of the cover member 4 passes, and a nut body passing portion 44 through which the nut body 2 passes.

Next, the tip corner portion of the wall member will be described.

The inner edge portion of the wall member 37 is the tip corner portion indicated by the reference numeral S. As shown in FIGS. 3A and 3D, the distance between the tip corner portion S and the center of gravity G2 when the bag nut 1 is housed in the holding recess 36 when viewed in the direction of the central axis of the supply rod 14. Is indicated by the reference numeral L1.

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

In FIG. 3A, the attractive force of the permanent magnet 16 acts on the bag nut 1, the entire bag nut 1 is housed in the holding recess 36, and the screw hole 3 is immediately before the guide pin 7 when the supply rod 14 advances. It stops at the point where it reaches. The stop position may be a position where the guide pin 7 is slightly inserted into the screw hole 3. Here, as shown in FIG. 3B, when the inner shaft 21 is pulled in by the contraction operation of the air cylinder 24, the permanent magnet 16 moves away from the cover member 4, and the attractive force of the bag nut 1 is substantially eliminated. ..

Due to this disappearance, the bag nut 1 moves in an arc in the vertical direction, and the outer surface of the nut body 2 descends while rubbing the tip corner portion S of the wall member 37 at the same time.

By simultaneously proceeding with the above-mentioned arc movement and rubbing down, the distance L1 between the tip corner portion S and the center of gravity G2 is reduced, and in proportion to this, the arc movement of the bag nut 1 is accelerated. go. That is, when the simultaneous progress is started, the arc movement is surely executed and accelerated. In FIG. 3D, since the center of gravity G2 exceeds the tip corner portion S, the arc displacement of the bag nut 1 is more likely to be performed. This exceeded state is indicated by reference numeral L2.

Eventually, the state shown in FIG. 3C is obtained. That is, when the opening edge of the screw hole 3 is received by the tapered portion 11 and the supply rod 14 retracts, the movable electrode advances, the welding current is applied, and the welding projection 12 is welded to the steel plate component 8.

Instead of the above-mentioned various air cylinders, an electric motor that outputs advancing / retreating can be adopted. It is also possible to replace the above-mentioned various permanent magnets with electromagnets.

The above-mentioned operations such as the advancing / retreating operation of the supply rod and 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.

When the supply rod 14 advances, the screw hole 3 stops advancing immediately before the guide pin 7 or at a position where the tip of the guide pin 7 is slightly inserted into the screw hole 3, and the advance of the supply rod 14 is almost stopped. At the same time, the attractive force of the permanent magnet 16 with respect to the bag nut 1 is extinguished, and due to this extinction, the bag nut 1 in an inclined posture moves while drawing an arc trajectory in the vertical direction, and at the same time, the outer surface of the nut body 2 moves. It moves while rubbing against the tip corner portion S of the wall member 37.

In this way, the movement of the cap nut 1 in an arc locus and the outer surface of the nut body 2 rubbing against the tip corner portion S of the wall member 37 are simultaneously performed. Therefore, as the rubbing movement progresses, Since the contact point between the outer surface of the nut body 2 and the tip corner portion S of the wall member 37 is relatively close to the position of the center of gravity G2 of the bag nut 1, that is, the interval L1 is reduced, the contact point is centered on the contact point. The arcuate displacement of the cap nut 1 is smoothly performed, and the fitting of the screw hole 3 with respect to the guide pin 7 is surely achieved.

When the thickness of the cover member 4 is reduced to reduce its mass and the center of gravity position G2 approaches the nut body 2 side, the rubbing movement progresses as shown by the reference numeral L2 shown in FIG. 3 (D). In addition, the center of gravity position G2 is located in front of the tip corner portion S of the wall member 37 when viewed in the direction of the central axis of the supply rod 14. In such a case, the arc displacement of the bag nut 1 is more likely to be promoted, and the supply to the guide pin 7 is ensured.

If the outer surface of the nut body 2 does not move while rubbing against the tip corner portion S of the wall member 37, the distance L1 between the tip corner portion S of the wall member 37 and the center of gravity position G2 of the bag nut 1 becomes large. Therefore, the force component for moving the bag nut 1 in the vertical direction by the arc motion becomes small, and the bag nut 1 is less likely to fall from the holding recess 36. However, while the bag nut 1 is displaced toward the vertical posture, the rubbing displacement is combined, so that the posture change of the bag nut 1 in the arc direction is promoted. That is, since the distance L1 between the tip corner portion S of the wall member 37 and the center of gravity position G2 of the bag nut 1 is reduced, the posture of the bag nut 1 in the arc direction is likely to change.

Since the position G2 of the center of gravity of the bag nut 1 is displaced toward the cover member 4, the holding stability of the bag nut 1 in the holding recess 36 is lowered, but the holding recess 36 surrounds the nut body 2. A main holding surface 38 formed by the wall member 37 and a sub holding surface 39 surrounding the hemispherical portion of the cover member 4 are formed, and the main holding surface 38 holds the outer surface of the nut body 2 and the sub The holding of the cover member 4 by the holding surface 39 is ensured by the attractive force of the permanent magnet 16. Therefore, even if the center of gravity position G2 of the bag nut 1 is offset to the cover member 4 side, the bag nut 1 does not shift in the holding recess 36 when the supply rod advances, and the bag nut 1 is reliably held in the holding recess 36. The stable operation of the supply rod 14 can be achieved. In particular, since the nut body 2 and the cover member 4 are held at two locations, the main holding surface 38 and the sub holding surface 39, the holding stability of the bag nut 1 is improved. Further, when the inclination angle of the supply rod 14 approaches the vertical direction, the bag nut 1 easily escapes from the holding recess 36, but by holding at the above two points, it is stable even when the inclination angle of the supply rod 14 changes. The nut is held.

The passage notch 42 through which the cap nut 1 passes when moving from the supply rod 14 to the guide pin 7 is formed in a state of being open on the lateral side surface (plane 30) opposite to the inclination direction of the supply rod 14. In addition, it has an arc-shaped cover member passing portion 43 through which the hemispherical portion of the cover member 4 passes, and a nut body passing portion 44 through which the nut body 2 passes. Therefore, when the bag nut 1 moves toward the guide pin 7 side with the arc movement, the cover member 4 surely passes through the cover member passing portion 43, and the operation stability is ensured. In particular, since the outer surface of the nut body 2 shifts with respect to the tip corner portion S of the wall member 37, the cover member 4 does not interfere with the cover member passing portion 43, and a reliable supply operation can be obtained.

The action and effect of the example of the supply method is the same as the action and effect of the example of the supply rod.

As described above, according to the apparatus of the present invention, the bag nut held by the supply rod is reliably supplied to the guide pin of the fixed electrode by using both the arc locus movement and the rubbing movement to the tip of the supply rod. To do. Therefore, it can be used in a wide range of industrial fields such as a body welding process for automobiles and a sheet metal welding process for home appliances.

1 Bag nut 2 Nut body 3 Screw hole 4 Cover member 6 Fixed electrode 7 Guide pin 8 Steel plate part 14 Supply rod 16 Permanent magnet 36 Holding recess 37 Wall member 38 Main holding surface 39 Sub-holding surface 40 Concave surface 41 Concave surface 42 Passing notch 43 Cover member passing portion 44 Nut body passing portion S Tip corner L1 Space between tip corner S and center of gravity G2 100 Supply device

Claims (2)

A cap nut with a screw hole on one side of the nut body and a hemispherical cover member bonded to the other side is supplied to the guide pin of the fixed electrode for electric resistance welding.
A holding recess for accommodating the bag nut is formed at the tip of the advancing / retreating operation type supply rod arranged in an inclined posture.
In the holding recess, a main holding surface formed by a wall member surrounding the nut body and a sub holding surface surrounding the hemispherical portion of the cover member are formed.
The passage notch that the cap nut passes through when transitioning from the supply rod to the guide pin is formed in a state of being open on the lateral side surface opposite to the inclination direction of the supply rod, and is hemispherical in the cover member. It has an arc-shaped cover member passing portion through which the portion passes and a nut body passing portion through which the nut body passes.
A permanent magnet that maintains a state in which the outer portion of the nut body is in contact with the main holding surface and the hemispherical portion of the cover member is in contact with the sub-holding surface is provided on the supply rod in a state in which it can advance and retreat.
When the supply rod advances, the advance of the supply rod is stopped when the screw hole is just before the guide pin or when the tip of the guide pin is slightly inserted into the screw hole, and almost at the same time as the stop, the bag nut is permanently inserted. The attractive force of the magnet is extinguished, and due to this extinction, the bag nut in the inclined posture moves while drawing an arc locus in the vertical direction, and at the same time, the outer surface of the nut body rubs against the tip corner of the wall member. A supply rod for bag nuts that moves while moving. A cap nut with a screw hole on one side of the nut body and a hemispherical cover member bonded to the other side is supplied to the guide pin of the fixed electrode for electric resistance welding.
A holding recess for accommodating the bag nut is formed at the tip of the advancing / retreating operation type supply rod arranged in an inclined posture.
In the holding recess, a main holding surface formed by a wall member surrounding the nut body and a sub holding surface surrounding the hemispherical portion of the cover member are formed.
The passage notch that the cap nut passes through when transitioning from the supply rod to the guide pin is formed in a state of being open on the lateral side surface opposite to the inclination direction of the supply rod, and is hemispherical in the cover member. It has an arc-shaped cover member passing portion through which the portion passes and a nut body passing portion through which the nut body passes.
A supply rod provided with a permanent magnet that maintains a state in which the outer portion of the nut body is in contact with the main holding surface and the hemispherical portion of the cover member is in contact with the sub-holding surface is prepared.
When the supply rod advances, the advance of the supply rod is stopped when the screw hole is just before the guide pin or when the tip of the guide pin is slightly inserted into the screw hole, and almost at the same time as the stop, the bag nut is permanently inserted. The attractive force of the magnet is extinguished, and due to this extinction, the bag nut in the inclined posture moves while drawing an arc locus in the vertical direction, and at the same time, the outer surface of the nut body rubs against the tip corner of the wall member. A supply method for a bag nut supply rod, which is characterized by moving while moving.

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