JPS6319293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a washer/nut delivery device used for supplying washers and nuts to a threaded portion of a crankshaft, for example, in an automatic engine assembly process.

[Technical background of the invention and its problems]

For example, in the automatic engine assembly process,
When tightening a nut onto a threaded portion of a crankshaft, first a washer is supplied, then a nut is supplied, and this nut is tightened and fixed by a nut tightening device such as a nut runner. However, since not only one type of engine but several types of engines coexist on the line, washers and nuts also need to be replaced depending on the type of engine. Therefore, a multistage washer feeder that supplies a plurality of types of washer and a multistage nut feeder that supplies a plurality of types of nuts are provided, and the washer nuts are supplied from these feeders. However, it is very difficult to chuck the supplied washers and nuts one by one, and it is especially difficult to mechanically chuck thin plate-like washers, which are in close contact with a flat surface. The reality is that automatic delivery devices have not yet been put into practical use.

[Purpose of the invention]

This invention was made based on the above circumstances, and its object is to be able to reliably take out and deliver multiple types of washers and nuts one by one from a feeder that supplies them, and to remove washers and nuts at the time of delivery. You can definitely chat. The purpose is to provide a delivery device for washers and nuts.

[Summary of the invention]

This invention provides a washer take-out member and a nut take-out member on a lifting platform that can accommodate each supply section of a multi-stage washer feeder and nut feeder, and these take-out members are inserted from below into the through holes of washers and nuts supplied to the above-mentioned supply section. A washer nut inserted into the taper pin can be chucked by a washer chuck and a nut chuck.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, 1 is a multi-stage washer feeder, and 2 is a multi-stage nut feeder.
Since these feeders 1 and 2 have the same structure, one of them will be explained based on FIG.
It is composed of tiered ball feeders 2a, 2b, and 2c, and is designed to feed nuts of a plurality of different sizes by vibration. And linear feeders 3a, 3b, 3c are connected to the unloading portion of each of these ball feeders 2a, 2b, 2c,
Supply sections 4a, 4b, and 4c are provided at this tip. These supply portions 4a, 4b, 4c are provided with cutout portions 5, and the cutout portions 5 are provided with
As shown in B, the through hole 6a of the washer 6 at the front end
The through holes 7a of the nuts 7 are arranged to face each other.

Further, the supply sections 4a, 4b, and 4c of the washer feeder 1 and the nut feeder 2 are spaced apart from each other at an angle of 90 degrees, and a lifting device 8 is installed between them. This lifting device 8 is constructed as shown in FIG. That is, 9 is an upright frame body, and on this frame body 9, parallel guide rails 10, 10 installed in the vertical direction and a screw rod 11 installed between these are arranged. A pulley 12 is fitted to the lower end of this screw rod 11, and this pulley 12 is interlocked with an AC servo motor 14 via a toothed belt 13. Further, a lifting platform 15 is provided on the guide rails 10, 10 so as to be able to rise and fall freely.
5 is provided with a threaded portion 16 that threads into the screw rod 11. Therefore, the lifting platform 15 is raised and lowered by the rotation of the screw rod 11, and is adapted to correspond to the supply sections 4a, 4b, 4c of the washer feeder 1 and nut feeder 2. This elevating table 15 is formed in an L-shape, with one end 15a of the washer feeder 1, and the other end 15b of each supplying section 4a of the nut feeder 2,
It faces 4b and 4c. A rail 17 is provided along the longitudinal direction of one end 15a of the lifting platform 15.
and a rodless cylinder 18 are installed in parallel. A washer removal member 20 is attached to this rail 17 via a slider 19 so as to be able to reciprocate. This washer take-out member 20 is connected to the movable portion 18a of the rodless cylinder 18 via a connector 21. The washer removal member 20 is formed in an inverted L shape as shown in FIG. 6, and the upper plate 22 is provided with a pin support 23 and a through hole 24. A taper pin 27 is pivotally supported on the pin support base 23 via a ball bush 25 so as to be vertically protrusive and retractable. A tapered portion 28 is formed at the upper end of this taper pin 27, and the small diameter portion of this tapered portion 28 is thinner than the through hole 6a of the washer 6, and the large diameter portion is formed to be thicker than the through hole 6a. The lower end of the taper pin 27 is attached to one end of a bracket 29, and a guide rod 30 is fixed to the other end of the bracket 29 in the vertical direction. The upper end of the guide rod 30 passes through the through hole 24 and projects upward from the upper plate 22, and a spring 31 is wound around the lower end to bias the guide rod 30 upward.

Washer removal member 20 configured in this way
When moved to the leftmost end in the figure by the rodless cylinder 18, its taper pin 27 opposed directly below the notches 5 provided in the supply parts 4a, 4b, 4c of the washer feeder 1, and moved to the rightmost end in the figure. It is arranged so that it is located at the washer delivery section 32 at the time.

Further, a nut take-out member 33 is provided at the other end 15b of the lifting platform 15, but its basic configuration is the same as that of the washer take-out member 20, and the same constituent parts will be described with the same number appended with a. omit,
Only the different parts will be explained. That is, an annular groove 34 is provided on the upper surface of the pin support 23a, and an O-ring 35 made of a rubber material with high frictional resistance is fitted into the annular groove 34, and the upper surface is slightly smaller than the pin support 23a. It stands out. Also,
The tapered pin 27a has a flat shaft shape, and the small diameter portion of the tapered portion 28a is thinner than the through hole 7a of the nut 7, and the large diameter portion is formed to be thicker than the through hole 7a. Furthermore, both sides of the tapered portion 28a are cut flat, thereby reducing the area of contact with the through hole 7a of the nut 7, that is, the screw, thereby preventing meshing. Note that 36 is a nut delivery section.

On the other hand, a robot 40 is located next to the lifting device 8.
A rotating arm 41 of this robot 40 is provided.
A nut tightening device 43 is attached via a rotating arm 42.
is provided. This nut tightening device 43 consists of a washer chuck 44 and a nut runner 45, and a nut chuck 46 is provided at the lower end of the nut runner 45. In addition, 47 is a nut tightening part such as a crankshaft of an engine.

Next, the operation of the washer nut delivery device constructed as described above will be explained. First, the washer 6 is supplied from the ball feeder 2a of the washer feeder 1, and the nut 7 is supplied from the ball feeder 2a of the nut feeder 2, and the threaded portion 47 is
To explain the case where the washer 6 and the nut 7 are fed in this order, the washer 6 is fed to the linear feeder 3a.
The nuts 7 are supplied to the supply section 4a through the linear feeder 3a, and the nuts 7 are supplied to the supply section 4a through the linear feeder 3a, with their through holes 6a and 7a facing the notch 5. on the other hand,
As the screw rod 11 rotates, the lifting platform 15 rises to the height of the top stage, that is, the ball feeders 2a, 2a, and then stops. Therefore, when the rodless cylinder 18 operates, the washer removal member 2
0 moves leftward in the figure along the rail 17, and when located at the leftmost end, the taper pin 27 faces directly below the notch 5 of the supply section 4a. Further, the nut removing member 33 moves forward along the rail 17a, and the taper pin 27a faces directly below the notch 5 of the supply section 4a. Therefore, the taper pin 27 is
The taper pin 27a faces the through hole 7a of the nut 7. In this state, when the lifting platform 15 is raised one pitch by the lifting device 8, the taper pin 27 is inserted into the through hole 6a of the washer 6, and the taper pin 27a is inserted into the through hole 7a of the nut 7. Next, when the washer take-out member 20 and the nut take-out member 33 are moved back by the rodless cylinders 18 and 18a, the washer 6 is transported to the washer delivery section 32 and the nut 7 is conveyed to the nut delivery section 36, where they stand by.

On the other hand, when the swing arm 41 of the robot 40 turns, the washer chuck 44 faces the washer delivery section 32 and the nut chuck 46 faces the nut delivery section 36. When the washer chuck 44 descends, a part of it comes into contact with the guide rod rod 30. When the washer chuck 44 descends further, the guide rod 30 retracts against the restoring force of the spring 31, and the taper pin 27 also retracts through the bracket 29. . At this time, the taper portion 2 of the taper pin 27
8 is fitted with a washer 6, and this washer 6 may be fitted at an angle. However, the taper pin 27 is recessed and the taper portion 28
When the washer 6 is recessed to the washer support part 23b of the pin support base 23, the washer 6 is supported by the washer support part 23b of the pin support base 23, and even if the washer 6 is tilted, it is aligned in a horizontal state. At this time, the washer chuck 44 is attached to the washer support portion 23b.
Check the upper washers 6. When the washer chuck is completed and the washer chuck 44 is raised, the guide rod 30 is projected upward by the restoring force of the spring 31, and the taper pin 27 is also returned to its original position. On the other hand, when the nut chuck 46 is lowered by the nut runner 45, a part of the nut chuck 46 pushes down the guide rod 30a, and the taper pin 27a is also retracted in the same manner as described above, but the nut 7 is pushed down by the taper pin 2.
It fits into the tapered portion 28a of 7a.

Therefore, when the taper pin 27a is recessed,
The nut 6 is placed on the O-ring 35. Then, when the nut chuck 46 further descends, the nut 7 on the O-ring 35
6 is adsorbed.

When the washer 6 and nut 7 are chucked in this manner, the swing arm 41 swings, and further the swing arm 42 swings. The washer chuck 44 first faces the nut tightening portion 47 of the crankshaft, opens the washer chuck 44, and supplies the washer 6 to the threaded portion. next,
A nut chuck 46 likewise faces the thread and feeds the nut 7 onto the thread. Then, the nut 7 is tightened onto the threaded portion 47 by the nut runner 45.

In the above embodiment, a case was described in which the washers 6 and nuts 7 were supplied from the upper ball feeders 2a, 2a, but washers 6 and nuts 7 of different sizes may be supplied from the middle or lower ball feeders 2c, 2c. In such a case, the lifting platform 15 may be lowered using the lifting device 8, and the ball feeder can be taken out from any of the ball feeders 2a, 2b, and 2c.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reliably take out the washer and nut one by one supplied to each supply section of the multi-stage washer feeder and nut feeder and deliver them to the washer chuck and nut chuck. At this time, the washers and nuts can be aligned and delivered, so chucking is reliable and the threaded portion can be easily supplied.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is an overall plan view, Figure 2 is a side view, Figure 3 is a perspective view of the lifting device, Figures 4A and B are plan views of the supply section, and Figure 5 is a partially cutaway front view of the main parts. Figure, 6th
The figure is a sectional view taken along the - line in FIG. 5, and FIG. 7 is a side view seen from the direction of FIG. 5. DESCRIPTION OF SYMBOLS 1... Washer feeder, 2... Nut feeder, 4a, 4b, 4c... Supply section, 6... Washer, 7... Nut, 8... Elevating device, 15... Lifting platform, 20... Washer take-out member, 27 ,27
a... Taper pin, 33... Nut removal member,
32... Washer delivery section, 36... Nut delivery section, 43... Nut tightening device, 47... Nut tightening section.

Claims (1)

[Claims] 1. A washer nut that is equipped with a multi-stage washer feeder that supplies multiple types of washer and a multi-stage nut feeder that supplies multiple types of nuts, and that delivers the washer and nuts supplied from these feeders to a nut tightening device. The delivery device includes: an elevating device installed opposite to both the supply sections of the washer feeder and the nut feeder; an elevating platform that can be raised and lowered by the elevating device to accommodate the supply sections of each stage of the washer feeder and the nut feeder; a washer removal member provided on the lifting platform so as to be reciprocally movable in a direction perpendicular to the lifting direction and protrudingly provided with a taper pin inserted into a through hole of one washer located at the forefront end of the supply section of the washer feeder from below; A nut take-out member is also provided on the lifting table so as to be able to reciprocate in a direction perpendicular to the lifting direction, and has a protruding taper pin inserted into the through hole of one nut located at the forefront end of the supply section of the nut feeder from below; , a washer delivery part and a nut delivery part, a washer chuck and a nut chuck, which are provided on the movement path of the washer take-out member and the nut take-out member, and a washer chuck and a nut chuck are provided, and the washer and nut are chucked from the washer delivery part and the nut delivery part to tighten the nut. A washer delivery device characterized by comprising a nut tightening device for conveying a washer to a mounting section.