JPH07121763B2 - Parts feeder - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to a device for holding a component at the tip of a supply rod and supplying it to a target location, such as a projection nut having a projection for welding or a distance piece. It is used in the field of supplying various parts.

(B) Conventional technology In the case of holding the part at the tip of the supply rod and stroking the supply rod to the target position, the part is made to stand by at a predetermined position in advance, and the part is moved forward while the supply rod is moving forward. It is known that the tip of the feed rod is held and advanced as it is, or the component transferred in the component feed pipe is directly moved to the tip of the feed rod and held there. In addition, 56
As disclosed in Japanese Laid-Open Patent Publication No. -20409, the component is temporarily stopped at a predetermined position and moved from there to the tip of the supply rod. It is disclosed that when a rod advances and stops at a predetermined position, air jets from directly above cause the parts to separate from the magnet.

(C) Problems to be Solved by the Invention In the above-described conventional example, there is a problem in that parts are not accurately held at the tip of the supply rod. In the former case described above, if the standby position of the parts deviates even a little from the stroke line of the supply rod, accurate part holding cannot be achieved, and in the latter case described above, the end position of the part supply pipe is not achieved. If is not set correctly with respect to the tip of the supply rod, the parts will not be held correctly. Correctly setting the mutual positional relationship as described above is difficult because the related members have a structure capable of relative movement. Also, holding a part during the stroke of the supply rod or holding a part that has moved vigorously in the supply pipe may cause the part to violently collide with the tip of the supply rod. The problem of being flipped back arises. Further, according to the one disclosed in the above-mentioned Japanese Utility Model Publication No. 56-20409, the lateral side surface of the component is attracted to the non-movable magnet, and the compressed air for release is jetted from directly above the component. Therefore, there is a problem in that the component goes away from the tip of the supply rod while rotating, and finally separates from the magnet. Therefore, when the component is detached, the component is delivered while being inclined and is not properly supplied to the target location.
Moreover, since compressed air is used, an accessory device for controlling the ejection of air is required, which is not preferable as a component supply device.

(D) Means for Solving Problems and Their Actions The present invention is provided to solve the above-mentioned problems, and in which the parts are held at the tip of the supply rod and are supplied to the target location. , The supply pipe end and the supply rod are arranged adjacent to each other so that the component can be transferred from the supply pipe end to the supply rod, and the component holding part is provided at the tip of the supply rod. -Shaped recessed shape, a stopper plate that receives the entry of parts is installed at the innermost part of this recessed shape, a magnet is arranged on the outer side of the stopper plate, and this magnet is embedded in a sliding body. Is in close contact with the outer surface of the supply rod and is capable of advancing and retreating with respect to the stopper plate, and its attractive magnetic force is set so as to act in the direction in which the parts enter the holding part, while the supply pipe Edge clerk Install the stopper in a position facing the holding part of the supply rod in the retracted state, and move the operating rod that moves the parts that have entered this locking part from the locking part toward the stopper plate of the holding part. It is characterized by being provided,
The locking part of the supply pipe positions the part once and then moves it to the holding part at the tip of the supply rod.At this time, the part is attracted by a magnet toward the stopper plate at the innermost part of the box-shaped recess. At the same time, it is completely inside the holding part. Then, when the supply rod advances to a predetermined position and stops there, this time, the magnet is moved along the outer surface of the supply rod, so that the attraction force to the component disappears and no force acts on the component. Instead, it falls.

(E) Example FIG. 7 is a side view of the appearance of the spot welding machine to which the device of the present invention is applied. The guide pin 2 is provided on the fixed electrode 1.
The steel plate component 3 is placed in a state where it penetrates. Code 4
Is a movable electrode.

The supply unit 5 includes a supply pipe 7 for a component welded to a lower portion of an outer cylinder 6, an air cylinder 8 joined to an upper portion of the outer cylinder 6,
Actuator 9 for transferring parts from the supply pipe 7 to the supply rod
Etc.

The detailed structure of the supply unit 5 will be described with reference to FIGS. 1 to 3. The components handled in this embodiment are the projection nuts indicated by reference numeral 10 (hereinafter referred to as “projection nut”).
A holding part 12 for receiving the nut 10 is formed at the tip of the supply rod 11, and the shape of this holding part is a box-shaped recess with the tip side open as shown in FIG. ing. The innermost member of the box-shaped recess is a stopper plate indicated by reference numeral 40, and as is apparent from the description, the nut 10 is held in a state of hitting the stopper plate 40. The supply rod 11 is housed in the outer cylinder 6 and is connected to the piston rod 13 of the air cylinder 8.

As can be easily understood from FIGS. 1 and 2, the supply pipe 7
The end portion of the supply pipe 7 and the supply rod 11 are arranged adjacent to each other so that the parts can be transferred from the supply rod 11 to the supply rod 11. The end portion of the supply pipe 7 has a locking portion 14 which is released to one side. The holding side of the supply rod 11 which is provided and released is in the retracted state (see FIG. 1) as shown in the drawing, is opposed at a close distance, and the stopper piece 15 is welded as shown in FIG. As a result, the stop position of the nut 10 is determined. An operating device 9 is connected to the back surface of the supply pipe 7 through a distance piece 16, and various devices such as an electromagnetic solenoid can be adopted as the operating device 9, but an air cylinder 17 is used here. Hole 18 opened in supply pipe 7
And the hole 19 opened in the distance piece 16 are in communication with each other and are coaxial with the screw hole of the nut 10 in the stop position. An operating rod 20 is fitted into the holes 19 and 18 in a slidable manner, and this rod is connected to a piston rod (not shown) of an air cylinder 17. A positioning pin 21 is fixed to the tip of the operating rod 20 so that the positioning pin 21 can be inserted into the screw hole of the nut 10.

The sliding body 22 is brought into close contact with the outer side surface 37 (see FIG. 2) of the supply rod 11, and a magnet (permanent magnet) 23 is embedded at a position corresponding to the holding portion 12. As is clear from the state shown in the figure, the magnet 23 is arranged on the outer side of the stopper plate 40, that is, at a position where the nut 10 that has entered the holding portion 12 is attracted in the entering direction. The sliding body 22 can be moved back and forth with respect to the stopper plate 40. The supply rod 11 has a double structure of an outer rod 24 and an inner shaft 25, a long hole 26 is opened in the stroke direction of the outer rod 24, and a bolt 27 passing through this long hole 26 causes
The sliding body 22 and the inner shaft 25 are integrated.

A long hole 28 in the stroke direction is also formed above the supply rod 11, and a restriction pin 29 fixed to the inner shaft 25 projects as shown in the figure. A coil spring 30 is interposed between the inner shaft 25 and the outer rod 24, and its elastic force is received by the restriction pin 29 hitting the lower end of the elongated hole 28.

A long hole 31 is formed in the lower portion of the outer cylinder 6 in the stroke direction, and a locking piece 32 is inserted from the outside. The drive device 33 attached to the outer surface of the outer cylinder 6 is realized by an air cylinder 34, and its piston rod 35 is connected to the locking piece 32. The relative position of the locking piece 32 and the restriction pin 29 is arranged on one virtual axis line, and when the supply rod 11 makes a stroke of a predetermined amount, the two are set to a close distance.

The outer rod 24, the inner shaft 25, the sliding body 22, and the like are preferably made of stainless steel so that the magnetic force of the magnet 23 acts more strongly on the nut 10.
Further, in this embodiment, as shown in FIG. 1 and FIG. 7, the holding unit 12 is arranged so that the entire supply unit 5 is inclined so as to be released in the lower right slant, and therefore the operating rod 20 is advanced to the upper left. It is supposed to do. However, as will be apparent from the following description of the operation, it is possible to install the supply unit 5 in the horizontal direction so that the operation rod 20 moves up and down and the holding portion 12 is released right below. Further, when there is a possibility that the nut 10 may fly out of the holding portion 12 due to inertia when the supply rod 11 stops, a protrusion 38 for preventing slippage as shown in FIG. 5 is provided, or a wall as shown in FIG. 6 is provided. Suitably a plate 39 is provided.

FIG. 1 shows a state in which the nut 10 reaches the locking portion 14 through the supply pipe 7 and is received by the stopper piece 15, and the nut 10 is against the concave portion of the holding portion 12, that is, the stopper plate 40. Are placed opposite each other. Now working rod 20
When is advanced by the output of the air cylinder 17, the positioning pin 21 enters into the screw hole of the nut 10, the nut 10 is pushed out as it is and enters the holding portion 12, and the attractive force of the magnet 23 is the nut 10 holding portion. The magnet 23 acts in such a direction as to come in, and is temporarily locked by the magnet 23. After that, when only the operating rod 20 returns to its original position, the air cylinder 8
The output of the feed rod 11 advances. At this time, the relative position between the magnet 23 and the holding portion 12 (that is, the nut 10) does not change and moves forward as it is, and when the nut 10 reaches the target position, the supply rod 11 stops. At this point, the regulation pin 29 has come to a position close to the locking piece 32, and the air cylinder 34 performs a contraction operation here,
The magnet 23 is forcibly pulled up through the locking piece 32, the regulation pin 29, the inner shaft 25, the bolt 27, and the sliding body 22 in this order, and is separated from the nut 10.
The magnetic force of attraction to will be substantially extinguished. Therefore, the nut 10 is released from the holding state at the target position and matches the guide pin 2 shown in FIG. 7, for example.

FIG. 4 shows a case where a magnet (permanent magnet) 36 is embedded in the stopper piece 15 in order to further improve the stationary stability of the nut 10 in the locking portion 14.

(F) Effect According to the present invention, the positional relationship between the supply rod end and the supply rod in the adjoining state where the parts can be transferred from the locking portion of the supply pipe to the holding portion at the tip of the supply rod. Since it is placed in the operating rod that acts on the parts in the locking part, the parts are once positioned before being sent to the holding part of the supply rod, and then moved into the holding part by the operating rod. I will let you. Therefore,
By accurately setting the standby position of the component with respect to the holding portion and moving it by the operating rod, the component is reliably fed into the holding portion, and the component supply with high operational reliability can be achieved.

Furthermore, since the holding action is performed by bringing the parts closer to the tip of the supply rod in the stationary state, there is no elastic phenomenon for the parts as described in the section of the prior art, and accurate holding is possible. Can be achieved.

The most important effect of the present invention is the position of the magnet with respect to the holding portion. Since the magnet is arranged on the back side of the stopper plate that receives the parts that enter the holding part, that is, on the outer surface of the supply rod on the outside of the holding part, it facilitates the parts to enter the holding part and makes an accurate stop. The position can be set. Since the magnet behaves as if it slides and retreats to a location where the magnet is deviated from the holding portion and the attraction force to the component disappears, the attraction force to the component disappears in an extremely short time rather than gradually. Since this depends on the sliding speed of the magnet, if the speed is set to a certain value or more, the attractive magnetic force can be instantaneously extinguished. In this way, the suction force on the component is quickly eliminated, so that the component is delivered from the holding portion in the correct posture without tilting. Then, as described above, all the problems caused by the air injection and the adsorption of the lateral side surface of the component by the magnet can be solved.

[Brief description of drawings]

1 is a vertical sectional side view, FIG. 2 is a sectional view taken along line (2)-(2) of FIG. 1, FIG. 3 is a three-dimensional view, and FIG. 4 is a vertical front view. 5 and 6 are longitudinal side views, and FIG. 7 is an external side view of the entire apparatus. 11 …… Supply rod, 10 …… Parts, 12 …… Holding part, 40 ……
Stopper plate, 23 …… Magnet, 37 …… Outer surface, 22 ……
Sliding body, 7 ... Supply pipe, 14 ... Locking part, 20 ... Operating rod.

Claims (1)

[Claims] 1. In a device for holding a component at a tip of a supply rod and supplying it to a target location, the supply pipe end and the supply rod are adjacent to each other so that the component can be transferred from the supply pipe end to the supply rod. Due to the positional relationship, a holding part for parts is provided at the tip of the supply rod, and this holding part is in the shape of a box-shaped recess. A magnet is arranged on the outer side of the plate, and this magnet is embedded in the sliding body, and this sliding body is in close contact with the outer side surface of the supply rod and can be moved forward and backward with respect to the stopper plate. The parts are set so as to act in the direction of entering the holding part, while the locking part at the end of the supply pipe is installed at a position facing the holding part of the feed rod in the retracted state, and this locking is performed. Come into the department Component supplying apparatus characterized in that a working rod for moving the parts toward the stopper plate of the holding portion from the locking portion.