JP3985237B2 - Projection nut supply control method - Google Patents

Description

  The present invention relates to the field of supplying projection nuts, and relates to a nut supply by inserting a guide rod of a supply rod into a screw hole of a projection nut in a skewered manner.

A part feeder, for example, a part feeder that applies vibration to a circular bowl to feed a projection nut and a projection nut from this part feeder against the stopper surface are stopped in place, and then the guide rod of the supply rod is moved to the projection nut There is known a type in which a projection nut is supplied to a target location by being inserted into a screw hole in a skewered manner.
Japanese Patent No. 3309245

  As shown in FIG. 8, the projection nut is usually used in a square shape. In FIG. 8, the upper surface 4a and the lower surface 4b of the projection nut 4 are substantially square. The dimensions of the projection nut 4 to be welded as having normal dimensions are, for example, a vertical L1 of 12 mm, a horizontal L2 of 12 mm, a thickness T of 4.5 mm, and a screw hole provided in the center of the surfaces 4a and 4b. Has an inner diameter D of 6 mm. And the protrusion 4c for welding is provided in the four corners of the lower surface 4b.

  The projection nuts that can be put into the parts feeder need only be normal ones with the same dimensions at all times, but other than the normal dimensions other than the normal dimensions may be mixed for some reason during transport. There is. In particular, with respect to the normal dimension, only the vertical L1 and horizontal L2 of the surface are each as small as 10 mm, and other dimensions may be the same. Hereinafter, such an undersized dimension is referred to as “abnormal nut”. For example, when a parts box with normal nuts and parts boxes with abnormal nuts are placed side by side on a car bed, the nut will bounce and enter the next parts box when the car bed vibrates during travel. There is. Or an operator may mistakenly mix an abnormal size into the normal size.

  Due to such a phenomenon, when a small-sized abnormal nut is supplied to a target location and welded to a counterpart steel plate part, the welding strength may be insufficient and the strength quality of the product may be deteriorated.

  Furthermore, when looking at the supply of conventional projection nuts as a system, there is no organic relationship between the delivery control on the parts feeder side and the structure and dimensions of the supply rod. There is a problem that the solution is not satisfactory.

The present invention has been provided to solve the above-described problems. A projection nut supply control method is provided in which a meshing corner portion is provided on a part of a supply rod so that an excessively small projection nut is not delivered. The purpose is to provide.

The projection nut supply control method according to claim 1, wherein the projection nut that has been sent through the nut supply pipe extending from the parts feeder is temporarily locked in the temporary holding chamber and is applied to the stopper surface to stop at a predetermined position. Thereafter, the guide rod of the supply rod is inserted into the screw hole of the projection nut in a skewered manner, and the projection nut is supplied from the temporary holding chamber to the target location through the opening of the nut supply pipe which is the outlet of the normal nut. The supply rod is composed of a large-diameter slide rod and a small-diameter guide rod. An extrusion surface is provided at the boundary between the slide rod and the guide rod, and an undernut that is in contact with the stopper surface at the edge of the extrusion surface. engagement is provided a corner pressed against the the nut surface of normal nut or abnormal nut waiting the next Both when the corner mesh by the pressure contact is inclined normal nut or abnormal nut, is a site where the opening is subjected to pressure contact of the lower surface of the normal nut or abnormal nuts, yet the upper inner surface normal nut of the nut supply pipe or supply control apparatus for a projection nut is a site that is being subjected to pressure of the ends of the top surface of the abnormal nut prepared, the feed rod moves forward when the abnormal nut is positioned on the stopper surface, waiting for the next said abnormal nut by the engagement corner portion is pressed against the surface of the to have a normal nut or abnormal nut, the nut and locked state pressed against the upper inner surface of the opening and the nut supply pipe of normal nut or abnormal nut nut supply pipe, It is characterized by suppressing the advancement of the supply rod.

That is, when the supply rod is advanced when the supply control device as described above is prepared and the abnormal nut is positioned on the stopper surface, the normal nut that is waiting next to the abnormal nut or the surface of the abnormal nut is placed on the surface. When the meshing corner is in pressure contact, the normal nut or abnormal nut is pressed against the opening of the nut supply pipe and the upper inner surface of the nut supply pipe to lock the nut and prevent the supply rod from advancing. .

Since the projection nut supply control method is provided with a meshing corner at the edge of the extrusion surface of the supply rod, if the supply rod advances when the abnormal nut is positioned on the stopper surface, the abnormality is detected. by the engagement corner portion on the surface of normal nut or abnormal nuts waiting for the next nut is pressed against a normal nut or abnormal nut is pressed against the upper inner surface of the opening and the nut supply pipe nut supply pipe, Deter the supply rod from entering. State Therefore, since the normal nut or abnormal nuts waiting for is pressurized by the engagement corner portion, a normal nut or abnormal nut waiting is locked between the engagement corner portion and the nut supply pipe Thus, the advancement of the supply rod is suppressed, and the abnormal nut is reliably prevented from being supplied to the target location.

The projection nut has a substantially square upper and lower surface. Therefore, even if the square nut has an excessively small dimension, the supply of the abnormal nut is reliably prevented by the formation of the engagement corner portion due to the small dimension and the pressure contact action.

The parts feeder is provided with means for discharging the abnormal nut. That is, the action of the abnormal nut discharging means provided in the parts feeder and the engagement corner provided in the supply rod is combined, thereby reliably removing the abnormal nut. That is, first, remove the excessively abnormal nut in the parts feeder, and if the abnormal nut is still supplied from the parts feeder to the stopper surface, This prevents the supply of abnormal nuts. Therefore, abnormal nuts prevent the supply of abnormal nuts as a system from the parts feeder to the supply rod due to the organic interaction between the parts feeder and the engaging corner of the supply rod, and realize reliable supply control. .

As described above, in the projection nut supply control method, the waiting normal nut or abnormal nut is pressurized by the meshing corner, and therefore the standby normal nut or abnormal nut is engaged with the meshing corner. The nut is locked with the nut supply pipe, the supply rod is prevented from advancing, and the abnormal nut is reliably prevented from being supplied to the target location.

Next, the best embodiment of the projection nut supply control method of the present invention will be described.

  First, the operation unit of the supply rod in FIG. 2 will be described. The fixed electrode 1 and the movable electrode 2 are arranged coaxially, and the steel plate part 3 is placed on the fixed electrode 1 and placed thereon. The movable electrode 2 is brought into close contact with the projection nut 4, and the nut 4 is electrically resistance welded to the steel plate part 3. The operating unit of the supply rod is indicated generally by the reference numeral 5. The operation unit 5 mainly includes a supply rod 6, a guide tube 7 for guiding the supply rod 6, and a nut supply tube 8 and a magnet 9 connected to a parts feeder 33 described later.

  The detailed structure of the operation unit 5 will be described with reference to FIG. 1. The end portion of the nut supply pipe 8 having a rectangular cross section is in close contact with the end face 10 of the guide pipe 7 and is welded. The nut 4 to be subject to supply control in the present invention has the shape as described above shown in FIG. FIG. 3 shows a square shape with a two-dot chain line. In order to correctly maintain the front and back sides and the orientation of the nut having such a shape, the nut supply pipe 8 has a rectangular cross section. A notch 12 that forms a temporary fixing chamber 11 is provided at the tip of the nut supply pipe 8. The notch 12 forms an opening of the nut supply pipe 8. The same reference numeral 12 is also given to this opening. A flat surface 14 is formed at the lower portion of the guide tube 7 by the cutting portion 13, and this flat surface forms a series of the same flat surfaces with the end surface 15 of the nut supply tube 8.

  A thick plate-like magnet (permanent magnet) 9 having a slightly flat rectangular parallelepiped shape is fixed in a state of being pressed against the flat surface 14 and the end surface 15 as is apparent from FIGS. As an example of this fixing method, a method of screwing the presser fitting 16 with a bolt 17 is adopted. The magnet 9 is obtained by fitting a magnet 20 on a slightly thick substrate 18 and closely attaching a covering plate 21 from one side, and this adhesion is achieved by welding. The magnet 20 is placed at a position corresponding to the nut 4, the surface of the covering plate 21 is a stopper surface 28, and the nut 4 is attracted and temporarily locked by the magnet, so that the inside of the temporary fixing chamber 11 is Positioning has been made.

  The supply rod 6 inserted into the guide hole 23 in the guide tube 7 comprises a large-diameter sliding rod 24 having a circular cross section and a small-diameter guide rod 25 having a small diameter and entering the screw hole 29 of the nut 4. A circular extrusion surface 26 is provided at the boundary between the two. The outer diameter of the guide rod 25 is set smaller than the inner diameter of the screw hole 29 of the nut 4. FIG. 1 shows a state in which the normal nut 4A is attracted by the magnet 9 and temporarily locked in the temporary fixing chamber 11. At this time, the axis of the guide rod 25 and the axis of the screw hole 29 are coaxial. ing. In other words, the distance between the axis of the guide rod 25 and the stopper surface 28 is set so that such a coaxial state can be obtained.

  When the supply rod 6 advances, the guide rod 25 enters the screw hole of the nut 4A and pushes down the nut 4A with the pushing surface 26, and the tip of the guide rod 25 is in the immediate vicinity of the guide pin 30 of the fixed electrode 1. Then, the nut 4A slides on the guide pin 25, and the screw hole 29 of the nut fits into the guide pin 30. In order to keep the nut 4A in contact with the extrusion surface 26 while the supply rod 6 is advanced, the advance speed of the supply rod 6 is set to be substantially the same as or faster than the drop speed of the nut. It is appropriate that the forward / backward movement of the supply rod 6 is performed by an air cylinder 27 as shown in FIG.

  A sensor 39 attached to the air cylinder 27 detects a movement when the piston (not shown) of the air cylinder 27 returns after the supply rod 6 supplies the nut 4A to the guide pin 30 of the fixed electrode 1. The movable electrode 2 is advanced by the detection signal.

  The projection nut 4 shown in FIG. 1 has a normal dimension in which the length L1 and the width L2 shown in the above example are both 12 mm. A normal nut of normal dimensions is labeled 4A. On the other hand, the length L1 and the width L2 shown in the above example are both 10 mm, and an abnormal nut having the same dimensions as the normal nut 4A is denoted by reference numeral 4B. Therefore, the surface dimension of the abnormal nut 4B is lower than the surface dimension of the normal nut 4A. In addition, the size of the surface dimension means the size of the dimension of the length L1 and the width L2, or the size of the diagonal line of the surfaces 4a and 4b.

  As shown in FIG. 4, the maximum dimension of the pushing surface 26 is the diameter d of the sliding rod 24, and the diameter d of the sliding rod 24 is set larger than the surface dimension of the abnormal nut 4B which is lower than the surface dimension of the normal nut 4A. By doing so, a meshing corner 32 is formed at the edge of the extrusion surface 26. The example shown in FIG. 4B is a case where the diagonal length of the abnormal nut 4B is smaller than the diameter d of the sliding rod 24. The example of FIG. This is a case where the diagonal lengths of the abnormal nut 4B are equal.

  The operation state shown in FIG. 5 is a case where the guide rod 25 has penetrated the abnormal nut 4 </ b> B stopped on the stopper surface 28. In this case, the meshing corner 32 is pressed against the surface of the normal nut 4A waiting next to the abnormal nut 4B, so that the normal nut 4A is connected to the opening 12 of the nut supply pipe 8 and the nut supply pipe 8. The supply rod 6 is prevented from advancing by being pressed against the upper inner surface 8a. Therefore, since the waiting normal nut 4A is pressurized by the meshing corner portion 32, the standby normal nut 4A is locked between the meshing corner portion 32 and the nut supply pipe 8. Thus, the advancement of the supply rod 6 is suppressed, and the abnormal nut 4B is reliably prevented from being supplied to the target location. That is, the engagement corner portion 32 pressurizes the vicinity of the end portion of the surface 4a of the normal nut 4A, so that it is inclined and locked as shown in FIG.

In order to obtain the lock phenomenon of the normal nut 4A as described above, the size of the opening 12, that is, the distance between the notch (opening) 12 and the engaging corner 32, and the internal height of the nut supply pipe 8 are determined. Is set. The expression “normal nut or abnormal nut” is expressed in such a manner that the nut following the abnormal nut 4B through which the guide rod 25 passes may be a normal nut or an abnormal nut. .

  In the operation state shown in FIG. 6, the guide rod 25 advances to the abnormal nut 4B adsorbed to the stopper surface 28, and the abnormal nut 4B at the tip of the guide rod 25 is as shown in FIG. It is in the state where it was thrown away. Since the abnormal nut 4B is blown off, the abnormal nut 4B is not supplied to the guide pin 30 which is the target location. And if the meshing corner | angular part 32 press-contacts to the surface 4a of the normal nut 4A, the advance of the supply rod 6 will be suppressed similarly to the case of FIG. That is, the engagement corner portion 32 pressurizes the vicinity of the end portion of the surface 4a of the normal nut 4A, so that it is inclined and locked as shown in FIG.

FIG. 7 shows a second embodiment of the projection nut supply control method of the present invention.

  In this embodiment, the locking operation of the supply rod 6 by the meshing corner portion 32 is systematically linked.

  A spiral delivery passage 35 is provided along the inner periphery of the circular bowl 34 of the vibration part feeder 33, and this delivery passage 35 is connected to the nut supply pipe 8. The delivery passage 35 is inclined so that the outer peripheral side of the bowl 34 is lowered, and a sorting hole 36 for discharging the undersized abnormal nut 4B is formed in the middle thereof. As shown in FIG. 7B, the width of the sorting hole 36 is such that the normal nut 4A passes over the sorting hole 36, and the abnormal nut 4B having an undersize is shown in FIG. It falls from the sorting hole 36 without being able to straddle the sorting hole 36. The abnormal nut 4 </ b> B that has fallen is stored in an isolation box 37 provided outside the bowl 34 so as not to return into the bowl 34.

  The functions and effects of the embodiment described above are listed as follows.

  When the supply rod 6 advances when the abnormal nut 4B is positioned on the stopper surface 28, the meshing corner portion 32 comes into pressure contact with the surface of the normal nut 4A waiting next to the abnormal nut 4B. The nut 4A presses against the opening 12 of the nut supply pipe 8 and the upper inner surface 8a of the nut supply pipe 8 to prevent the supply rod 6 from advancing. Therefore, since the waiting normal nut 4A is pressurized by the meshing corner portion 32, the standby normal nut 4A is locked between the meshing corner portion 32 and the nut supply pipe 8. Thus, the advancement of the supply rod 6 is suppressed, and the abnormal nut 4B is reliably prevented from being supplied to the target location.

  The waiting normal nut 4A has its lower surface and upper surface end pressed against the opening 12 of the nut supply pipe 8 and the upper inner surface 8a of the nut supply pipe 8, respectively. In this manner, the engagement corner portion 32 and the nut supply pipe 8 are locked, so that the supply rod 6 is prevented from advancing and the abnormal nut 4B is reliably prevented from being supplied to the target location.

  Even if the dimension of the square portion is excessively small, the supply of the abnormal nut 4B is surely prevented by the formation of the engagement corner portion 32 due to being too small and the pressure contact action.

  The action of the selection hole 36 of the abnormal nut 4B provided in the parts feeder 33 and the engagement corner portion 32 provided in the supply rod 6 is combined, and the abnormal nut 4B is reliably eliminated. That is, first, the excessively small abnormal nut 4B is removed from the parts feeder 33. If the abnormal nut 4B is still supplied from the parts feeder 33 to the stopper surface 28, The supply of the abnormal nut 4B is blocked by the above action. Therefore, the abnormal nut 4B prevents the supply of the abnormal nut 4B as a system from the parts feeder 33 to the supply rod 6 by the organic interaction between the parts feeder 33 and the engagement corner portion 32 of the supply rod 6, and is reliable. High supply control is realized.

As described above, since the standby normal nut 4A is pressurized by the meshing corner portion 32, the standby normal nut 4A is locked between the meshing corner portion 32 and the nut supply pipe 8. Thus, the advancement of the supply rod 6 is suppressed, and the abnormal nut 4B is reliably prevented from being supplied to the target location.

  In the present invention, since the advancement of the supply rod is suppressed by providing the meshing corner portion, the supply of the abnormal nut is reliably prevented, and the welding quality of the projection nut can be greatly improved. Can be used in

  It is a vertical side view which shows embodiment of this invention.   It is a side view showing the whole operation unit.   It is the top view which looked at the part of FIG. 1 from the bottom.   It is a figure which shows the formation state of a meshing corner | angular part.   It is a vertical side view which shows the operation state of a supply rod.   It is a vertical side view which shows the operation state of a supply rod.   It is a figure of the simple each part of a parts feeder.   It is a perspective view of a projection nut.

Explanation of symbols

33 Parts Feeder 8 Nut Supply Pipe 4 Projection Nut 28 Stopper Surface 6 Supply Rod 24 Slide Rod 25 Guide Rod 26 Extrusion Surface 29 Screw Hole 32 Engagement Corner

Claims (1)

The projection nut that has been delivered through the nut supply pipe extending from the parts feeder is temporarily locked in the temporary holding chamber and applied to the stopper surface to stop it in place. Then, the guide rod of the supply rod is inserted into the screw hole of the projection nut. The projection nut is passed through in a skewered manner and supplied to the target location through the opening of the nut supply pipe, which is the outlet of the normal nut, from the temporary fixing chamber. The supply rod has a large diameter sliding rod and a small diameter A push rod is provided at the boundary between the slide rod and the guide rod, and the normal nut or abnormal nut waiting next to the small nut that is in contact with the stopper surface at the edge of the push rod provided with a mating corners pressed against the nut surface, corner mesh by the pressure contact or normal nut Site when that is inclined normal nut, is the site where the opening is subjected to pressure contact of the lower surface of the normal nut or abnormal nuts, yet the upper inner surface of the nut supply pipe is subjected to pressure of the ends of the top surface of the normal nut or abnormal nut If the supply rod advances when the abnormal nut is positioned on the stopper surface, the normal nut waiting next to the abnormal nut or the surface of the abnormal nut is prepared. When the meshing corner is in pressure contact, the normal nut or abnormal nut is pressed against the opening of the nut supply pipe and the upper inner surface of the nut supply pipe to lock the nut and prevent the supply rod from advancing. Projection nut supply control method.

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