JPH0780556B2 - Supply device for projection nuts, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a device for supplying components such as a projection nut, and its main purpose is to improve operational reliability.

(B) Conventional Technology The conventional technology that is considered to be the closest to the present invention is Japanese Patent Publication No. 59-7549.
The technology is disclosed in Japanese Patent Publication (R23K11 / 14), and the main points thereof are shown in FIGS. 11 to 13. The inner shaft 1b is slidably combined in a hollow outer shaft 1a, and a magnet (permanent magnet) 3 for adsorbing a component (nut) 2 is fixed to the tip of the inner shaft 1b. Outer cylinder 4 housing the outer shaft 1a
Is fixed to the stationary member as shown in the drawing, and is inserted into the guide groove 4a provided in the inner surface of the outer cylinder 4 in the stroke direction.
The pin 5 fixed to 1a is fitted. The counterpart sheet metal part 6 is placed on the fixed electrode 7, and the guide pin 7a of the fixed electrode penetrates the hole of the sheet metal part 6 and extends upward.

Both shafts 1a, 1b have their end faces aligned on one plane and flush with each other, and the nut 2 is adsorbed thereto. In this state, when both shafts come together as a unit and reach a certain point, the inner shaft 1b is prohibited from expanding, and only the outer shaft 1a moves into the nut 2 as shown in FIG.
Is fitted to the guide pin 7a. During the above stroke operation, the pin 5 moves in the guide groove 4a, so that the outer shaft 1a is prevented from rotating.

Although the structure for prohibiting the advance of the inner shaft 1b described above is not shown, the restriction pin fixed to the inner shaft 1b is projected from the long hole opened in the outer shaft 1a so that both shafts 1a, 1b have a fixed amount. Since the regulating pin is locked to the stationary member after advancing, the advancing of the inner shaft 1b is forcibly stopped, and only the outer shaft 1a advances as shown in FIG. The nut attracting force is reduced, and the nuts are fitted into the guide pins 7a so that they fall.

(C) Problems to be Solved by the Invention According to the above-described conventional technology, since the regulation pin of the inner shaft is locked to the stationary member, the magnetic force for the nut is lowered. , The inner shaft is stopped, the outer shaft is relatively advanced due to this stop, and the operation is performed, so that the magnetic force decreases during the operation of the nut, and if some external force acts on it, That is, the nut will fall off immediately at a place other than the specified one. Further, in the above-mentioned conventional technique, the nut is adsorbed on the flat end face formed by the inner shaft and the outer shaft, so if some vibration or external force acts on the nut, the relative position between the nut and both shafts will change. It may go wrong and hinder the normal supply of parts.

(D) Means for Solving Problems and Their Actions The present invention is provided to solve the above problems, in which a slanted supply rod can be slid into a hollow outer shaft and the inside thereof. It is configured with an inner shaft that is fitted with a magnet. Install an air cylinder that advances the outer cylinder, and at the other end of the outer cylinder, install a computer that guides parts such as projection nuts, and let the restriction pin provided on the inner shaft protrude through the long hole of the outer shaft to make the outer cylinder. The engaging piece of the drive unit attached to the outer side surface of the drive unit is inserted into the outer cylinder through the long hole of the outer cylinder, and the engaging piece of the drive unit is placed in a positional relationship facing the regulating pin of the inner shaft. In addition, a frame-shaped projection having an opening for holding a component is provided at the tip of the outer shaft, and a tip corner portion is formed on this projection and the opening is directed in the direction of entry of the component. It is opened, and the parts are delivered to a predetermined position while the parts are housed and held in the frame-shaped projections to prevent the parts from being displaced, and the engagement pieces of the drive device are By forcibly pushing up the regulating pin of the shaft, the suction force with respect to the projection nut is substantially eliminated. Then, the parts are supplied while rotating around the tip corners of the protrusions.

(E) Embodiments FIG. 1 is a side view of all the pairs of devices, and up to FIG. 7 is a case where a projection nut is supplied to a fixed electrode of a spot welding machine.

The sheet metal component 9 is placed on the fixed electrode 8, and the guide pin 10 of the fixed electrode 8 penetrates the sheet metal component 9. 11 is a movable electrode. A supply device 12 such as a projection nut comprises an inclined supply unit 13 and an air cylinder 14. Explaining the supply unit 13, the inner shaft is slidable inside the hollow outer shaft 15.
A supply rod 17 is formed by combining 16 pieces. As is apparent from FIG. 4, the cross-sectional shape of the outer shaft 15 is provided with flat portions 18 and 19 at opposed positions to form a so-called oval shape, which serves as a detent to be described later. A magnet (permanent magnet) 20 is joined (adhered, for example) to the tip of the inner shaft 16, and the end face of the magnet 20 and the outer shaft 15 is at a predetermined advance position as shown in FIGS. 1 and 2. Until reaching, the surface is flush with one another, and the projection nut 21 is suction-held therein.

The restriction pin 22 fixed to the inner shaft 16 penetrates an elongated hole 23 opened in the stroke direction of the outer shaft 15 and further projects from the outer shaft 15. A compression coil spring 24 is provided inside the outer shaft 15 between the inner shaft 16 and the outer shaft 15, and the tension of the spring 24 is received by the restriction pin 22 hitting the lower end of the long hole 23. In this state, the lower end surfaces of the magnet 20 and the outer shaft 15 are flush with each other.

A piston rod 25 of the air cylinder 14 is connected to the supply rod 17. The outer cylinder 26 containing the supply rod 17 is
An air cylinder 14 is fixed to the upper end of the air cylinder 14, and a shutter 27 for guiding the nut 21 is welded to the lower end thereof. The supply rod 17 is accommodated in the outer cylinder 26 with a gap as shown in the drawing. Outer shaft 15 on top plate 28 of shutter 27
By forming a circular hole 29 that fits tightly, the end of the shutter 27 is bifurcated as shown in FIG. 4, and the guide plate 31 is fixed to the end face of the bifurcated portion 30. As a result, the flat portion 18 of the outer shaft is in close contact with the guide plate. Further, if a gap is formed between the circular hole 29 and the flat surface portion 19, the movement of the nut 21 may be hindered.
I'm in contact with 19 people. The stationary member, such as the guide plate 31 or the padding piece 32, is in contact with each flat portion 18, 19 in order to prevent the outer shaft 15, that is, the supply rod 17, from rotating. However, it may be in contact with both of the flat portions 18 and 19 as shown in the figure, or may be in contact with either one of them. Further, as shown by the chain double-dashed line in FIG. 2, a protrusion 51 may be provided in the vicinity of the inner central portion of the outer cylinder 26, and the flat portion 18 may be brought into surface contact with the protrusion 51 to prevent rotation.

A protrusion for holding a component is provided at the tip of the outer shaft 15. This projection is a frame-shaped (substantially U-shaped) projection 34 having an opening 33 on one side as shown in FIG. The opening 33 is opened in the direction in which the shooter 27, that is, the component enters. As shown in FIGS. 5 and 9, reference numeral 52 is the tip corner portion of the projection 34, and as can be understood from FIGS. 2 and 9, the corner portion farthest from the shooter 27 is the tip corner portion 52. It is said that.

Another magnet (permanent magnet) 35 is embedded in the guide plate 31, which allows the nut 21 to pass through the shutter 27.
Are sucked in and smoothly enter the frame of the protrusion 34.

Opening and closing plates 36 and 37 are provided to make the nut 21 temporarily locked more securely. It is pivotally attached to pivots 38, 39 which are fixed to the bifurcated portion 30 of the shooter. In short, one wing piece of the hinge serves as the opening / closing plates 36, 37, and the other wing piece is fixed to the bifurcated portion 30 as the fixing plates 40, 41 by the bolts 42, 43. The spiral spring 42 '(only the side of the pivot 38 is shown in FIG. 6) assembled to the pivots 38, 39 gives the opening and closing plates 36, 37 elastic force in the closing direction so that the state shown in FIG. I am maintaining.
The alternate long and two short dashes line in FIG. 6 shows a state in which the opening / closing plate 36 is pushed open.

The structure is such that the inner shaft and the outer shaft can be integrated to advance to a predetermined position and stop, and then the inner shaft can be forcibly retracted. A drive device 44 for doing so is mounted on the outer surface of the outer cylinder 26. Although there is a system such as an electromagnetic solenoid as a drive device, in this embodiment, an air cylinder 45 is adopted,
An engagement piece 47 is fixed to the tip of the piston rod 46. The engaging piece 47 penetrates through the long hole 48 opened in the outer cylinder 26 and
It is in the inside of 26, and that part is facing so that it can abut against the regulation pin 22.

2 and 3 show a state in which the nut 21 (illustrated by a chain double-dashed line) enters the frame-shaped projection 34 and is firmly held by the magnet 20, so that the air cylinder 14 is When the supply rod 17 moves into operation and the nut 21 opens and closes the opening / closing plate 3
Push open 6,37 to reach the specified place, where the supply rod 17
Stops advancing. Then, when the air cylinder 45, which is a drive device, is activated, the inner shaft 16 is forcibly retracted via the engagement piece 47 and the restriction pin 22, and the magnet 20 moves to a position where the suction force on the nut 21 disappears. The nut holding is released and the guide pin 10 of the opponent is released. In the above stroke operation, the flat portion 18 and / or the flat portion of the outer shaft
Since 19 receives the surface contact from the stationary member, the rotation stop of the supply rod is always performed.

The timing for forcibly retracting the inner shaft 16 will be described with reference to FIGS. 7 and 8. In FIG. 7, the guide pin 10 and the screw hole of the nut 21 are retreated at a very close position. This is the most certain case. FIG. 8 shows that the bolt 49 is fitted into the hole 50. In this case, the bolt 49 is stopped slightly before the hole 50, and then the inner shaft 16 is retracted, so that the bolt 49 is inserted into the hole 50.
It behaves like pushing inward.

The compression coil spring 24 installed between the inner shaft 16 and the outer shaft 15 can be omitted if the inner shaft 16 can secure the positions shown in FIGS. 2 and 3 by its own weight.

9 and 10 show a transitional state in which the nut 21 is separated from the supply rod 17, and FIG. 9 shows a state in which the supply rod 17 stops immediately before the guide pin 10 while holding the nut 21. Here, when only the inner shaft 16 is forcibly retracted as shown in FIG. 10, the magnetic force applied to the nut 21 substantially disappears, and the nut 21 falls down as shown. When such a fall occurs, it rotates counterclockwise around the tip corner portion 52 of the projection 34, and the nut screw hole
When 53 is aligned with the guide pin 10, the nut supply is completed as shown in FIG.

(F) Effect According to the present invention, the supply rod with the magnet is accommodated in the outer cylinder with a gap, and the engaging piece of the drive device attached to the outer surface of the outer cylinder can push back the regulating pin of the inner shaft. Because of the opposing positional relationship, the inner shaft can be forcibly retracted after the supply rod stops at a predetermined position. Therefore, the magnetic force of the magnet does not decrease until the nut or the like reaches the intended location, and reliable supply can be realized while holding the parts stably. Furthermore, since the parts are housed in the frame-shaped protrusions,
Even if some external force acts on the component, the relative position between the component and both shafts does not change, and accurate component supply becomes possible. Further, since the tip corner portion is provided on the protrusion, the component is supplied while rotating around this point, and the component is properly supplied. That is, since the tip corner portion becomes the center of rotation, the rotation trajectory of the component is always uniform, which realizes accurate component supply.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention, FIG. 1 is a side view showing the appearance of the apparatus, FIG. 2 is a vertical side view, FIG. 3 is a vertical front view, and FIG. (4)-(4) sectional view, FIG. 5 is a three-dimensional view, FIG. 6 is a side view of the opening / closing plate, and FIGS. 7 and 8 are partial sectional views showing a component supply transition period, and FIG. Also, FIG. 10 is a drawing similar to FIG. 7. 11 to 13 are prior arts, FIGS. 11 and 12 are partial sectional views, and FIG. 13 is a sectional view taken along line (13)-(13) of FIG. 17 …… Supply rod, 15 …… Outer shaft, 16 …… Inner shaft, 21,49 …… Parts, 20 …… Magnet, 2
6 …… Outer cylinder, 14 …… Air cylinder, 27 …… Shutor, 22
...... Regulation pin, 23 ...... elongated hole, 44 ...... drive device, 47 ...... engagement piece, 48 ...... elongated hole.

Claims (1)

[Claims] 1. A tilted supply rod is constituted by a hollow outer shaft and an inner shaft slidably fitted in the hollow outer shaft, and a magnet for attracting and holding a component is provided at a tip end portion of the inner shaft for supply. The rod is housed in the outer cylinder with a gap, an air cylinder for advancing and retracting the supply rod is installed at one end of the outer cylinder, and a shooter that guides parts such as a projection nut is installed at the other end of the outer cylinder. The restriction pin provided on the shaft is projected through the long hole of the outer shaft, and the engaging piece of the drive device attached to the outer surface of the outer cylinder is inserted into the outer cylinder through the long hole of the outer cylinder to lock the drive device. A frame-shaped projection in which the joint piece is in a positional relationship facing the restriction pin of the inner shaft and has an opening at the tip of the outer shaft for holding a component. Provided, the supply device such as a projection nut, characterized in that for this projection are opening is opened in the penetration direction of the component together with the front end corner is formed.