JP2010214465A - Member for positioning stop position of projection nut and feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for positioning the stop position of a projection nut which can temporarily lock a projection nut in a stable posture, and can improve the durability of a protective plate, and to provide a feeder. <P>SOLUTION: The member 9 for positioning a stop position uses a projection nut 1 having at least two projections 4 for welding as the object. In the member, a stop face 28 sucking the nut 1 and receiving the same at a prescribed part is formed, a receiving face 31 tightly stuck to the horizontal face 2A of the nut 1 is formed at the stop face 28 in a state of being floated-up from the stop face 28, and the receiving face 31 is elongated to the pushing direction of the nut 1. Further, the feeder is assembled with the member 9. Since the horizontal face 2A of the nut 1 is received at the face-to-face contact by the receiving face 31, the temporary locking of the nut 1 is achieved in a stable state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stop positioning member that receives a projection nut that has been transferred and sucks it by a suction means to set a stop position of the projection nut, and a projection nut supply device that uses such a stop positioning member.

  In general, the projection nut transferred from a parts feeder or the like is applied to the stopper surface and stopped at a predetermined position, and then supplied to an electrode for electric resistance welding with a supply rod, and then projection welding is performed on the other steel plate part. Known. As an example, there is a projection nut supply device described in Japanese Patent No. 3985237. This is shown in FIG. 3 (A), and the projection nut to be transferred is shown in FIGS. 2 (A) and 2 (B). In the following description, the projection nut may be simply expressed as a nut. FIG. 3A shows an embodiment of the present invention. The problem of the present invention is described with reference to FIG.

  The projection nut will be described.

  The projection nut 1 shown in FIGS. 2 (A) and 2 (B) is made of iron, and the main body 2 is square when viewed from directly above, and a screw hole 3 is provided at the center thereof. The welding projections 4 are formed at the four corners on one side of the main body 2. As is apparent from FIGS. 2A and 2B, the welding protrusion 4 protrudes in the axial direction of the screw hole 3 and also protrudes from the main body portion 2 in the diameter direction of the screw hole 3. Therefore, it protrudes from the lateral side surface 2A of the main body 2 and this protruding dimension is indicated by the symbol L. In other words, as is apparent from the moving state of the nut 1 in FIG. 3A, a protrusion protruding in the conveying direction of the nut 1 from the main body 2, that is, the side surface 2A is formed. The lateral side surface 2A is a plane.

  As for the dimensions of each part of the nut 1, the vertical and horizontal dimensions of the main body 2 are 13 mm, the height dimension in the center line direction of the screw hole 3 is 4.5 mm, the inner diameter of the screw hole 3 is 6 mm, and the protruding dimension L is 0.5 mm. .

  Next, the projection nut supply device will be described.

  The projection nut supply device 5 shown in FIG. 3 (A) is of a type in which the nut 1 temporarily locked at a predetermined position is skewed with a supply rod and supplied to a target location. The nut 1 delivered from a parts feeder (not shown) reaches the temporary fixing chamber 7 through a supply pipe 6 having a rectangular cross section. A guide pipe 8 having a circular cross section is welded to the end of the supply pipe 6 so that the supply pipe 6 and the guide pipe 8 are orthogonal to each other, and a stop positioning member 9 is arranged at the end of the nut 1 in the advancing direction. is there. That is, the stop positioning member 9 is disposed at the end portion of the nut 1 in the conveyance direction. And the above-mentioned protrusion dimension L is formed toward this conveyance direction. A space formed by the supply pipe 6, the guide pipe 8, and the positioning member 9 in this manner is a temporary fixing chamber 7. The temporary stop chamber 7 is provided with an outlet opening 10 through which the nut 1 is delivered.

  A supply rod 12 is accommodated in the guide tube 8 in a state where the supply rod 12 can advance and retract. The supply rod 12 has a circular cross section, and includes a large-diameter sliding portion 13 that slides in the guide tube 8 and a guide rod 14 that has a smaller diameter and penetrates the screw hole 3 of the nut 1. . An extrusion surface 18 that is in close contact with the upper surface of the nut 1 is formed at the boundary between the sliding portion 13 and the guide rod 14. An air cylinder 11 is attached to the guide tube 8, and its piston rod is coupled to the supply rod 12.

  Next, the stop positioning member will be described.

  The stop positioning member 9 constitutes a part of the inner wall surface of the temporary fixing chamber 7, and is fixed by screwing a fixing bolt 16 into a pressing metal 15 welded to the guide tube 8. This fixing is performed by pressing the stop positioning member 9 against a flat receiving surface 17 formed on the outer periphery of the end portion of the guide tube 8.

  The stop positioning member 9 has a three-layer structure. A circular through hole is formed in a main member 19 formed of a thick steel plate, and a circular magnet (permanent magnet) 20 is fitted therein to protect the temporary fixing chamber 7 side. A plate 21 is affixed, and a back plate 22 is affixed to the opposite side. That is, the thickness of the main member 19 and the thickness of the magnet 20 are set to be the same, and the protection plate 21 and the back plate 22 are attached to both sides thereof by partial welding. The surface of the protection plate 21 is a stop surface 28 of the nut 1. The stop surface 28 is a flat surface.

  The nut 1 entering the temporary fixing chamber 7 was vigorously received by the protective plate 21 by the attractive force of the magnet 20 acting in the direction indicated by the arrow 26, and the screw hole 3 and the guide rod 14 became substantially coaxial. Stop in state. Thus, when the nut 1 is received by the protective plate 21, the portion of the projection dimension L of the welding projection 4 collides with the protective plate 21 at high speed.

  On the other hand, the place where the nut 1 is supplied is an electrode of electric resistance welding. A steel plate part 24 is placed on the fixed electrode 23, and the nut 1 is supplied to a guide pin 25 protruding through the steel plate part 24 as shown by a two-dot chain line. When the supply rod 12 advances, the guide rod 14 passes through the screw hole 3, the nut 1 is pushed out by the pushing surface 18, and the tip of the guide rod 14 stops immediately near the guide pin 25. The guide rod 14 is slid to match the guide pin 25. Thereafter, the supply rod 12 is retracted, the movable electrode 36 is advanced, and the nut 1 is welded to the steel plate part 24.

  While the supply rod 12 is advanced, the second nut 1 is prohibited from moving by the sliding portion 13. However, when the supply rod 12 returns to the position shown in FIG. The nut 1 is attracted by the magnet 20 and vigorously collides with the protection plate 21, and positioning is performed to prepare for the next advancement of the supply rod 12.

Japanese Patent No. 3985237

  The prior art as described above has the problems shown in FIGS. 3B and 3C.

  The problem shown in FIG. 3B is that the projecting dimension L exists, so that the nut 1 attracted by the magnet 20 is temporarily locked to the stop surface 28 in a tilted state. In addition, the axis XX of the supply rod 12 and the axis YY of the screw hole 3 intersect. Normally, even if such an inclination of the axis Y-Y occurs, the margin dimension that allows the guide rod 14 to pass through the screw hole 3 is selected such as the thickness of the guide rod 14 and the distance between the axis XX and the stop surface 28. Therefore, the phenomenon that the nut 1 is flipped off at the tip of the guide rod 14 does not occur.

  However, if an error occurs in the selection of the thickness of the guide rod 14 or the distance between the axis XX and the stop surface 28, the tip of the guide rod 14 collides with the opening edge of the screw hole 3, and the guide rod 14 The nut 1 is flipped off without passing through the screw hole 3. Therefore, it is necessary to manufacture the guide rod 14 with a very high accuracy such as the thickness of the guide rod 14 and the distance between the axis XX and the stop surface 28, which is not preferable in terms of productivity. At the same time, when a change over time such as wear occurs on the stop surface 28, a similar problem occurs.

  On the other hand, the problem shown in FIG. 3 (C) is that the welding protrusion 4 is concentrated and hits one place on the stop surface 28, so that the place is abraded and a depression 29 is formed, and the depth is the protruding dimension. When L is reached, the axis XX of the supply rod 12 and the axis YY of the screw hole 3 are parallel, but an offset of the distance L1 occurs. The state where the depression 29 is formed is shown in FIG. When the offset L1 is thus formed, the axis line YY is deviated from the axis line XX. Normally, a margin dimension that allows the guide rod 14 to pass through the screw hole 3 even if such an offset occurs is given by selecting the thickness of the guide rod 14, the distance between the axis XX and the stop surface 28, and the like. Therefore, the phenomenon that the nut 1 is bounced off at the tip of the guide rod 14 does not occur.

  However, if an error occurs in the selection of the thickness of the guide rod 14 or the distance between the axis XX and the stop surface 28, the tip of the guide rod 14 collides with the opening edge of the screw hole 3, and the guide rod 14 The nut 1 is flipped off without passing through the screw hole 3. Therefore, it is necessary to manufacture the guide rod 14 with a very high accuracy such as the thickness of the guide rod 14 and the distance between the axis XX and the stop surface 28, which is not preferable in terms of productivity. At the same time, if such a depression 29 is formed, it is necessary to replace the stop positioning member 9 within an early stage, which is uneconomical.

  The present invention has been provided to solve the above-described problems, and a projection nut stop positioning member and supply capable of temporarily locking the projection nut in a stable posture and improving the durability of the protective plate. The purpose is to provide a device.

  The invention according to claim 1 is an invention of a stop positioning member, wherein the projection nut having at least two welding projections that have been transferred is a target for stop positioning, and the projection nut is sucked to a predetermined location. A stop surface is formed, and a receiving surface that is in close contact with the lateral side surface of the projection nut that has been transferred to the stop surface is formed in a state of floating from the stop surface, and the receiving surface extends in the pushing direction of the projection nut. A stop positioning member for the projection nut.

  Since the lateral side surface of the projection nut that has been transferred is received in a state of being in close contact with the receiving surface, the flat surface of the lateral side surface and the receiving surface is brought into contact with each other. Therefore, the nut is received in a stable and correct posture, the relative position with respect to the pushing means such as the supply rod can be accurately maintained, and the nut is not accidentally flipped off. Since the flat surfaces of the lateral side surface and the receiving surface are in contact with each other, the surface pressure per unit area is reduced, and deformation over time such as wear of the receiving surface is minimized. In addition, since the lateral side surface of the nut is received by the receiving surface in a state of contact with the surface, the nut elastically bounces (bounds) to a slight level that is substantially harmless and the stop position of the nut is set accurately. The Furthermore, local wear and deformation like the above-described depression do not occur, and the durability of the stop positioning member is improved. The receiving surface is formed in a state where it floats from the stop surface, and this receiving surface extends in the pushing direction of the projection nut. Therefore, when the nut is pushed out, the receiving surface performs a guide function, and stable nut feeding is realized.

  The invention according to claim 2 is the stop positioning member for the projection nut according to claim 1, wherein the width dimension of the receiving surface is set smaller than the interval dimension of the welding projections.

  Therefore, since the welding protrusion is in a state of straddling the receiving surface on both sides of the receiving surface, the above-described operational effects can be ensured.

  According to a third aspect of the present invention, the flying height of the receiving surface is set to be substantially the same as or higher than the dimension in which the welding projection protrudes from the lateral side surface of the projection nut in the transfer direction of the projection nut. A stop positioning member for a projection nut according to claim 1 or 2.

  Since the size relationship between the flying height and the size of the protrusion of the welding protrusion is set as described above, the tip of the welding protrusion slides on the stop surface or slightly between the stop surface. The nut is delivered in a state where there is a clear gap, and the above-described nut catching and smooth delivery are ensured.

  The invention according to claim 4 is the invention of the supply device, the projection nut having at least two welding projections that have been transferred is temporarily locked with a stop positioning member that forms a part of the inner surface of the temporary fixing chamber, The projection nut is pushed out by an advancing / retracting type supply rod and supplied to a target location, and a stop surface is formed on the stop positioning member by sucking the projection nut and receiving it at a predetermined location, and is transferred to the stop surface. A projection nut supply device characterized in that a receiving surface that is in close contact with the lateral side surface of the projection nut that has been formed is formed in a state of floating from the stop surface, and this receiving surface extends in the pushing direction of the projection nut. .

  Since the lateral side surface of the projection nut that has been transferred is received in a state of being in close contact with the receiving surface, the flat surface of the lateral side surface and the receiving surface is brought into contact with each other. Therefore, the nut is received in a stable and correct posture, the relative position with respect to the supply rod can be accurately maintained, and the nut is not accidentally flipped off. Since the flat surfaces of the lateral side surface and the receiving surface are in contact with each other, the surface pressure per unit area is reduced, and deformation over time such as wear of the receiving surface is minimized. In addition, since the lateral side surface of the nut is received by the receiving surface in a state of contact with the surface, the nut elastically bounces (bounds) to a slight level that is substantially harmless and the stop position of the nut is set accurately. The Furthermore, local wear and deformation such as the above-mentioned depression do not occur, and the durability of the stop positioning member is improved, and as a result, a supply device with excellent durability can be obtained. Since the receiving surface is formed in a state where it floats from the stop surface, and this receiving surface extends in the pushing direction of the projection nut, the receiving surface performs a guide function when the nut is pushed out by the advancement of the supply rod, and a stable nut Supply is realized.

  The operational effects of the stop positioning member according to the second and third aspects of the present invention can be listed as operational effects in the projection nut supply device.

It is a top view and sectional drawing of a stop positioning member. It is the perspective view and side view of a projection nut. It is sectional drawing and partial sectional drawing of a supply apparatus.

  Next, a mode for carrying out the stop positioning member and the supply device for the projection nut of the present invention will be described.

  1, 2, and 3 (A) show Example 1. FIG.

  The description regarding FIG. 3A is the same as the contents described above, and is omitted. Moreover, the iron projection nut 1 targeted in this embodiment is the same as that described in FIG. Therefore, the description regarding FIG. 2 is also omitted.

  The same members as those described above in the configuration of each part illustrated in FIG. 1 are denoted by the same reference numerals as those described above, and detailed description thereof is omitted.

  The main member 19, the protection plate 21 and the back plate 22 are integrated by partial welding indicated by reference numeral 32.

  The receiving surface will be described.

  An elongated receiving member 30 is formed at the center of the stop surface 28 so as to extend in the pushing direction of the nut 1. A top surface of the receiving member 30 is a flat receiving surface 31, which is formed in a state of floating from the stop surface 28. The flying height H is set to be the same as the protruding dimension L or larger than the flying height H. The receiving surface 31 and the stop surface 28 are in a parallel positional relationship. Since the receiving member 30 has the shape as described above, the receiving surface 31 also extends in the direction in which the nut 1 is pushed out.

  The protrusion dimension L is 0.5 mm as described above, and the flying height H is 0.6 mm.

  The receiving member 30 may be formed by cutting the protective plate 21, or a strip-shaped plate material may be fixed to the surface of the protective plate 21 by adhesion or partial welding.

  As is clear from FIGS. 1A and 1B, the width of the receiving surface 31 is set smaller than the distance between the welding protrusions.

  As the supply device 5, the stop positioning member 9 having the above-described shape is assembled, and the receiving surface 31 extends in the same direction as the forward / backward direction of the supply rod 12.

  Next, the operation of attracting the nut will be described.

  When the supply rod 12 is in the retracted position, the nut 1 that has moved through the supply pipe 6 is sucked into the temporary fixing chamber 7 by the magnet 20 and is received in a state where the lateral side surface 2A of the nut 1 is in close contact with the receiving surface 31. It is done. At this time, the welding protrusion 4 is in a state of straddling the receiving surface 31 (receiving member 30), and the lateral side surface 2A is in close contact with the receiving surface 31. Then, the supply rod 12 advances, and the nut 1 is supplied to the guide pin 25 after the lateral surface 2A slides on the receiving surface 31.

  Next, another modification will be described.

  As indicated by a two-dot chain line in FIG. 1C, the receiving member 31 can be formed over the entire length of the stop positioning member 9. In this way, since the direction of the stop positioning member 9 in the vertical direction becomes free, it is possible to prevent erroneous assembly and to be reversed and reused when the receiving member 31 is worn. .

  The attraction means described above is the permanent magnet 20, but it is also possible to use a vacuum as shown in FIG. 1D instead. Here, the plate thickness of the protective plate 21 is increased, and the protective plate 21 itself forms the stop positioning member 9. An intake passage 33 opened there opens to the receiving surface 31, and the intake passage 33 is connected to a vacuum pump (not shown) via an air hose 34. The other configuration is the same as that of the previous example including a portion not shown, and the same reference numerals are described for members having similar functions.

  The nut 1 approaching the temporary fixing chamber 7 is sucked to the receiving surface 31 by the low pressure formed by the intake air from the intake passage 33, and when the lateral side surface 2A comes into close contact with the receiving surface 31, the suction force to the nut 1 is strengthened. The nut 1 is temporarily locked. Other functions and effects are the same as in the previous example.

  Note that, instead of the air cylinder, an electric motor that outputs and retreats may be employed. It is also possible to replace the permanent magnet with an electromagnet.

  The square projection nut as shown in the figure usually has four welding projections arranged at the four corners, but the two welding projections should be nut welded due to circumstances such as the shape of the mating steel plate part. There is also. Therefore, the number of welding protrusions in the present invention is expressed as at least two.

  The flying height H is set to be equal to or larger than the protruding dimension L. However, even if the flying height H is slightly smaller than the protruding dimension L, the flying height H is the same as that described above. Since the intersection of the axes XX and YY and the offset L1 are very small, there is no practical problem.

  The operational effects of the first embodiment described above are as follows.

  Since the transferred lateral side 2A of the projection nut 1 is received in a state of being in close contact with the receiving surface 31, the flat surface of the lateral side 2A and the receiving surface 31 comes into contact with each other. Therefore, the nut 1 is received in a stable and correct posture, the relative position with respect to the supply rod 12 can be accurately maintained, and the nut 1 is inadvertently flipped in a state as shown in FIGS. 3 (B) and (C). It will not be skipped. Since the flat surfaces of the side surface 2A and the receiving surface 31 are in contact with each other, the surface pressure per unit area is reduced, and temporal deformation such as wear of the receiving surface 31 is minimized. Further, since the lateral side surface 2A of the nut 1 is received by the receiving surface 31 in a state of contact with the surface, the nut 1 is elastically bounced (bound) to a slight level that is substantially harmless, and the nut 1 is stopped. Is set correctly. Further, local wear and deformation like the above-described depression 29 do not occur, and the durability of the stop positioning member 9 is improved. The receiving surface 31 is formed in a state of floating from the stop surface 28, and this receiving surface 31 extends in the pushing direction of the nut 1. Therefore, when the nut 1 is pushed out, the receiving surface 31 performs a guide function, and a stable nut. Sending is realized.

  The width of the receiving surface 31 is set to be smaller than the distance between the welding protrusions 4.

  Therefore, since the welding projection 4 is in a state of straddling the receiving surface 31 on both sides of the receiving surface 31, the above-described operational effects can be ensured.

  The flying height H of the receiving surface 31 is set to be substantially the same as or higher than the protruding dimension L from which the welding protrusion 4 protrudes from the lateral side surface 2 </ b> A of the nut 1 in the transfer direction of the nut 1.

  Since the magnitude relationship between the flying height H and the dimension L from which the welding protrusion 4 protrudes is set as described above, the tip of the welding protrusion slides on the stop surface 28 or the stop surface. The nut is fed with a slight gap between the nut 28 and the nut receiving by the flat contact as described above, and smooth feeding with minimized sliding resistance is ensured.

  As a supply device, the nut 1 having at least two welding projections 4 transferred is temporarily locked by a stop positioning member 9 that forms a part of the inner surface of the temporary fixing chamber 7, and the nut 1 is moved forward and backward. The stop rod 28 is pushed out by the supply rod 12 and supplied to the target location, and a stop surface 28 is formed on the stop positioning member 9 by sucking the nut 1 and receiving it at a predetermined location. A receiving surface 31 that is in close contact with the lateral side surface 2A of the nut 1 is formed in a state of floating from the stop surface 28, and this receiving surface 31 extends in the pushing direction of the nut 1.

  Since the lateral side surface 2A of the nut 1 that has been transferred is received in a state of being in close contact with the receiving surface 31, a contact state between the flat surfaces of the lateral side surface 2A and the receiving surface 31 is obtained. Therefore, the nut 1 is received in a stable and correct posture, the relative position with respect to the supply rod 12 can be accurately maintained, and the nut 1 is inadvertently blown off as shown in FIGS. 3 (B) and 3 (C). There is nothing. Since the flat surfaces of the side surface 2A and the receiving surface 31 are in contact with each other, the surface pressure per unit area is reduced, and temporal deformation such as wear of the receiving surface 31 is minimized. Further, since the lateral side surface 2A of the nut 1 is received by the receiving surface 31 in a state of contact with the surface, the nut 1 is elastically bounced (bound) to a slight level that is substantially harmless, and the nut 1 is stopped. Is set correctly. Furthermore, local wear and deformation as in the above-described depression 29 do not occur, and the durability of the stop positioning member 9 is improved, and as a result, the supply device 5 with excellent durability can be obtained. The receiving surface 31 is formed in a state where it floats from the stop surface 28, and this receiving surface 31 extends in the direction of pushing out the nut. Therefore, when the feeding rod 12 advances, the receiving surface 31 has a guide function. Indeed, stable nut supply is realized.

  The operational effects of the stop positioning member according to the second and third aspects of the present invention can be listed as operational effects in the projection nut supply device.

  As described above, according to the present invention, a projection nut stop positioning member and a supply device that can temporarily lock the projection nut in a stable posture and improve the durability of the protective plate. It can be used in a wide range of industrial fields such as welding processes and sheet metal welding processes for household appliances.

DESCRIPTION OF SYMBOLS 1 Projection nut 2 Main-body part 2A Side surface 3 Screw hole 4 Welding protrusion 5 Projection nut supply apparatus 9 Stop positioning member 12 Supply rod 14 Guide rod 18 Extrusion surface 19 Main member 20 Magnet (permanent magnet)
21 Protective plate 22 Back plate 25 Guide pin 26 Arrow 28 Stop surface 30 Receiving member 31 Receiving surface L Protrusion dimension L1 Offset dimension H Flying height

Claims (4)

  The projection nut having at least two welding projections that have been transferred is intended for stop positioning, and a stop surface that sucks the projection nut and receives it at a predetermined location is formed and transferred to the stop surface. A stop positioning member for a projection nut, characterized in that a receiving surface in close contact with a lateral side surface of the projection nut is formed in a state of floating from the stop surface, and the receiving surface extends in the pushing direction of the projection nut.   The stop positioning member for a projection nut according to claim 1, wherein a width dimension of the receiving surface is set to be smaller than a distance dimension between welding protrusions.   3. The flying height of the receiving surface is set to be substantially the same as or higher than a dimension in which a welding projection protrudes from a lateral side surface of the projection nut in a direction in which the projection nut is transferred. Stop positioning member for projection nut.   The projection nut having at least two welding projections that have been transferred is temporarily locked by a stop positioning member that forms a part of the inner surface of the temporary fixing chamber, and the projection nut is pushed out by an advancing and retracting supply rod to the target location. The stop positioning member is formed with a stop surface that sucks the projection nut and receives it at a predetermined location, and the receiving surface that is in close contact with the lateral side surface of the projection nut that has been transferred to the stop surface is A projection nut supply device, wherein the projection nut is formed in a state of floating from a stop surface, and the receiving surface extends in a pushing direction of the projection nut.

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