JPH0198519A - Parts supply head - Google Patents

Abstract

PURPOSE:To make an accurate parts positioning by making an compressed air in which pressure is uniformed to flow from the peripheral wall to the inside of a supply tube in which parts are gravitationally dropped in a supply head of a small screw, etc. CONSTITUTION:A small screw 12 is gravitationally dropped in the inside of a supply tube 11. A compressed air uniformly flows into the tube 11 from inflow holes 21 after the compressed air is supplied in a ring-state chamber 15 from an unshown compressed air supply source and pressure is made uniform. And the compressed air has a high pressure in the peripheral part near the holes 21 and a low pressure in the middle part. Accordingly, the dropping small screw 12 is guided to the middle of the tube 11, and its attitude is corrected in the axis direction of the tube 11 by the pressure difference. Consequently, a gap is formed between the screw 12 and the inner periphery, and the screw 12 has an accurate attitude and position. Thus an accurate positioning can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a parts supply head used for co-feeding parts such as machine screws.

[Conventional technology]

For example, as a component supply head for handling relatively small-shaped components such as machine screws, there is a component supply head that utilizes gravity acting on the component itself. This is equipped with a supply tube, and is configured to cause the parts supplied into the supply tube to fall one by one along the inner circumferential surface by gravity.

[Problem that the invention seeks to solve]

However, in this structure where the inside of the supply cylinder is allowed to fall by gravity, in order to allow parts to fall smoothly, the inner diameter of the supply cylinder is made larger than the external shape of the part, and there is a gap between the parts and the inner peripheral surface of the supply cylinder. A certain amount of space must be provided. Therefore,
There were cases in which parts fell in an inclined position or were biased to one side inside the supply tube. As a result, there was a problem in that even if the supply cylinder was positioned accurately, the parts could not necessarily be positioned accurately. When the component is a small screw, the component may be inserted into the screw hole at an angle, or may not be inserted out of the screw hole.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and provides a component supply head that can accurately position components. A plurality of inflow holes are provided at equal intervals in the circumferential direction on the peripheral wall of the supply cylinder that is allowed to fall by gravity, through which uniformly pressurized compressed air flows into the inside.

[Effect]

In the present invention, the pressure of the compressed air flowing in from the inflow hole is high at the periphery and low at the center, so the component is guided to the center of the supply tube by this compressed air and its posture is corrected in the axial direction of the supply tube. will be done.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing the main parts of the component supply head according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is the entire component supply device equipped with the component supply head. FIG. In FIG. 3, the symbol l indicates a parts supply device used for supplying parts such as machine screws, and includes a multistage pole feeder device 2 for aligning machine screws, and a multistage pole feeder device 2 disposed on the side of the workbench 3. Robot device 4 and this robot device 4
The machine screws are delivered to the parts supply head by supplying the machine screws aligned by the multi-stage pole feeder device 2 and compressed air into the transport pipe 7. 6. 8.9 is a workpiece supported on the workbench 3. The workpiece 8 is provided with a through hole 8a and a counterbore 8b through which a machine screw passes, and the workpiece 9 is provided with a screw hole 9a into which a machine screw is screwed.

Reference numeral 11 denotes a supply cylinder provided in the component supply head 6 for allowing the machine screw 12 to fall by gravity along the inner circumferential surface. It is set to be somewhat larger than the diameter. This supply tube 11 is held vertically so as to be vertically movable, and is positioned at a predetermined position on the workpiece 8.9 by rotation of the arm 5. The transport pipe 7 is connected to the upper part of the supply tube 11, and the machine screws 12 are sequentially supplied thereto.

Reference numeral 13 denotes a slide member provided below the connection portion of the transport tube 7 of the supply cylinder 11. The slide member 13 is movable back and forth with respect to the supply tube 11, and is connected from the transport tube 7 to the supply tube 11.
The machine screws 12 supplied in the container 1 are allowed to fall one by one by gravity.

14 is a container member provided below the slide member 13. This container member 14 has a relatively large shape compared to the supply tube 11, and has an annular chamber 15 that covers the outside of the supply tube 11.
is formed. This annular chamber 15 is for equalizing the pressure of compressed air flowing into the supply cylinder 11 from an inflow hole, which will be described later. An annular chamber 1 is provided on the outer peripheral wall of the container member 14.
A connecting joint 16 is provided that communicates the inside and outside of 5. 17 is a hose connected to this connection joint 16,
Although not shown, it is connected to a compressed air supply source.

A plurality of inflow holes 21 for allowing compressed air in the annular chamber 15 to flow into the annular chamber 15 are bored at equal intervals in the circumferential direction at a portion of the peripheral wall of the supply tube 11 facing the annular chamber 15.

In this embodiment, the four inflow holes 21 are located downward and are oriented rightward with respect to the center of the supply tube 11 . Therefore, in this embodiment, the compressed air flows spirally as shown by the dotted chain line in FIGS. 1 and 2. 22
are exhaust holes for discharging the air that has flowed into the supply cylinder 11 from the inflow hole 21 to the outside, and four exhaust holes are provided near the lower open end of the supply cylinder 11 at equal intervals in the circumferential direction.

In the component supply head configured in this manner, the supply cylinder 11 is positioned by the arm 5 of the robot device 4 at a position corresponding to the screw hole 9a of the workpiece 9, the through hole 8a of the workpiece 8, and the counterbore 8b.

Then, by retreating the slider member 13,
The machine screw 12 falls due to gravity.

On the other hand, compressed air supplied into the annular chamber 15 from a compressed air supply source (not shown) equalizes the pressure in the annular chamber 15, and then evenly flows into the supply cylinder 11 from the inflow hole 21. The pressure of this compressed air is high in the peripheral area near the inflow hole 21, and the pressure is low in the central area away from the inflow hole 21, so this pressure difference supplies the machine screw 12 falling from above. Guide it to the center of the tube 11,
The attitude can be corrected in the axial direction of the supply cylinder 11.

Therefore, even if a gap is provided between the machine screw 12 and the inner circumferential surface, the posture and position of the machine screw 12 can be adjusted to the supply cylinder 11.
Therefore, the machine screw 12 can be accurately positioned and accurately inserted into the screw hole 9a.

In addition, in the embodiment, since the compressed air is made to flow in in a spiral manner, if the strength of the compressed air is made strong enough to rotate the machine screw 12, the falling posture of the machine screw 12 can be prevented. In addition to stabilization, one or two threads of the machine screw 12 can be screwed into the threaded groove of the threaded hole 9a.

Furthermore, the exhaust hole 22 is provided near the open end of the supply cylinder 11, and when dropping the machine screw 12, the open end can be brought as close as possible to the surface of the workpiece 8, making positioning even more accurate. Can be done.

In addition, in the above embodiment, an example was explained in which machine screws 12 were supplied as parts, but the present invention is not limited to this, and the present invention can also be used to supply various types of screws as well as rod-shaped parts. can.

Further, the number, shape, and orientation direction of the inflow holes 21 can be changed as appropriate. Further, the annular chamber 15 is provided as a means for equalizing the pressure of the compressed air flowing into the supply cylinder 11 from the inflow hole 21, and each inflow hole 21 is connected to each inlet hole 21 by a hose or the like to supply compressed air of uniform pressure. It is not necessarily necessary to provide it if it is connected in parallel to the compressed air supply source (for example, an air tank) that supplies the air.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of inflow holes through which uniformly pressurized compressed air flows into the peripheral wall of the supply cylinder, which allows parts to fall by gravity along the inner peripheral surface, are arranged at equal intervals. Because of this provision, the components falling due to gravity can be guided to the center of the supply cylinder by the compressed air flowing in from the inflow hole, and the posture can be corrected in the axial direction.

Therefore, since the attitude and position of the component can be determined with respect to the supply tube, the component can be accurately positioned.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the main parts of a component supply head according to the present invention, FIG. 2 is a cross-sectional view taken along line nn in FIG. 1, and FIG. 3 is an entire component supply device equipped with the component supply head. FIG. 11... Supply tube, 12... Machine screw, 15... Annular chamber, 21... Inflow hole. Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Claims] In a component supply head equipped with a supply cylinder that allows parts to fall by gravity along an inner circumferential surface, a plurality of inflow holes are provided in the peripheral wall of the supply cylinder in a circumferential direction to allow uniformly pressurized compressed air to flow into the inside. Component supply heads arranged at equal intervals.