JPH04193430A - Feeding and tightening device for nut and washer - Google Patents

Abstract

PURPOSE:To supply a nut and a washer in a limited space and fit and tighten them to a shaft member by providing a nut tightening means having inside a top end part a projecting and retreating guide rod which penetrates respective holes of a nut and a washer gripped through a gripping means and guides both of them onto the shaft member to be tightened. CONSTITUTION:A guide rod 55 is inserted through respective holes in order of a nut N and a washer W, and the projection 56 on the extreme end is engaged with the hole on the end of a shaft S. Next, an elevatable plate 29 is further brought down by a gripping mechanism 25, and the washer W is inserted to the shaft S and the nut N is placed on the upper end of the shaft S. Next, a brought down socket 54 is engaged with the nut N horizontally held on a horizontal holding plate 42 and correctly tightened to the shaft S. After completion of the tightening, the nut N is once released, the gripping mechanism 25 is retreated to return to the initial stand-by position, hereafter last tightening is performed, and hence a series of processes are completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an apparatus for supplying and tightening nuts and washers for supplying nuts and washers to a tightening position and tightening them onto a shaft member.

(Prior art) Tightening by fitting the nut and washer from above the shaft member is difficult, especially when it comes to the device, because it is difficult to fit the nut horizontally to the shaft member, and the tightening method may end up being tightened diagonally. There may be a problem.

In order to prevent such diagonal tightening, the device disclosed in Japanese Utility Model Application Publication No. 1-N7831 uses a distribution device that moves the nuts and washers supplied to each location on a surface to move the nuts and washers to their respective positions. In this mechanism, the nuts and washers are moved in a plane direction different from the above-mentioned movement direction so that they are vertically spaced from each other, overlap, and then tightened. This method requires a surface member for horizontally guiding the shaft, which poses a problem in that it cannot be applied to a shaft member installed in a narrow area.

(Problems to be Solved by the Invention) The present invention was made in view of such problems, and its purpose is to supply nuts and washers even in a limited space and to correctly attach them to shaft members. The objective is to provide a new device that can be fitted and tightened.

(Means for Solving the Problems) In other words, the present invention achieves the above problems by carrying out supply and tightening of nuts and washers as snowmaking, by positioning and holding the supplied washers and nuts, respectively, and hoisting them horizontally. a pair of lifting means equipped with stepped rods, a pair of lifting means that can be opened and closed, and a washer gripping means that is arranged so that the washer lifting means and tightening can be moved horizontally between positions. and a nut horizontal holding part having a U-shaped recess with a diameter and width corresponding to the diameter of the nut's hole at the tip, and a gripping claw that can be opened and closed, and is located directly above the washer gripping means, and the nut lifting means and tightening part are Nut gripping means arranged so as to be horizontally movable between positions, and a nut and washer gripped by these gripping means and held by penetrating through holes in the nut and washer to guide both onto a shaft member to be tightened. A nut tightening means is provided with a rod that can be freely suspended inside the tip.

(Function) With this configuration, the washer gripping means receives the washer lifted up from the supply section by the lifting means and grips it horizontally, and the nut gripping means has a U-shaped tip at the tip. The received nut is gripped horizontally by placing it on a horizontal holding part having a recess, and in this state, the washer and nut are sent to the tightening position. On the other hand, the tightening means arranged at the tightening position positions the washer and nut sent here on the shaft member by the guide rod and holds them on the horizontal holding part. Correctly tighten the tightened nut onto the shaft member.

(Example) Therefore, the illustrated embodiment will be described below.

FIG. 1 shows the entire structure of a device constituting an embodiment of the present invention. This device is roughly divided into two parts: horizontally positioning and holding the washer W and nut N conveyed by the feeder 5.7. Each chunk mechanism 30.40 will be described later.
A lifting mechanism 10 lifts the nut N and washer W lifted up by the lifting mechanism 10 and transfers them horizontally to a tightening position. A washer W and a mechanism 50 are used to guide the nut NV, fit it onto the shaft S, and fasten the nut N% to the shaft S.

Next, to explain these detailed structures, the lifting mechanism] O has a pair of sills 11 and 16 for lifting a washer W and a nut N, and is vertically connected to one side of the base 1 via a bracket 2. installed on. These pair of cylindrical cylinders 11,] 6 are located directly below the end positioning portions 6.8 of the washer supplying feeder 5 and the nut supplying feeder 7 shown in FIG.
Rod No. 6] 2.17 has a small diameter portion 12a, 1 with a taper slightly smaller in diameter than the inner diameter of the hooker W and the nut N at the tip.
It is formed as a thick rod with a diameter of 7a, and the large diameter part 1
2b, 17t) and the small diameter portions 12a, 17a are connected to the terminal positioning portion 6.8 by the seats 12c, 17bc.
The washer W and nut N that have been fed into the chuck mechanism 3o and the nut N can be held horizontally and lifted up to a holding position by the chuck mechanisms 3o and 40.

On the other hand, the delivery mechanism 20 is composed of a lateral feed mechanism 21 and a gripping mechanism 25 that grips the washer W and the nut N.

The lateral feed mechanism 21 is composed of a support plate 22 that supports the gripping mechanism 25, and a lateral feed cylinder 24 that feeds the gripping mechanism 25 to a tightening position via this support plate. 24 is horizontally fixed to the back of the support substrate 3 erected on the base 1,
The support plate 22 attached to the guide sleeve 4.4 on the support base plate 3 via slide rods 23.23 can be moved forward and backward.

This support plate 22 has a gripping mechanism main body 2 on its front surface.
6 is integrally attached to the main body 26, and an elevating cylinder 27 is fixed to the upper part of the main body 26, and the elevating plate 29 attached to the lower part of the main body 26 is moved by this cylinder 27 via a slide rod 28. It is constructed so that it can be moved up and down.

3 to 5 show two chuck mechanisms 30 and 40 attached to this elevating plate 29. On the lower surface of this plate 29, there is a chuck mechanism 30 for holding a washer.
0 is fixed, and a chuck mechanism 40 for holding the nut is attached to the top surface via a slide plate 41 so as to be slidable back and forth.

As shown in FIG. 4, the chuck mechanism 30 for holding the washer includes a pair of chuck claws 33, 33 that open and close in the horizontal direction.
and a cylinder 36 for opening and closing the chuck jaws that opens and closes them left and right, and a washer WP is installed inside the chuck jaws 33 and 33 facing each other.
8. A large arc surface 34 that can be held from the outside,
A small diameter circular arc surface 35 having a diameter slightly larger than the hole diameter of the nut N is formed in two stages, and these chunk claws 33.33 are brought into contact with the side surface of the ridge 32 protruding from the base 31. In the closed state, the washer W can be held by resting on the stepped portion formed between the small arc surface 35.35 and the large arc surface 34.34. .

On the other hand, the chuck mechanism 40 for holding the nut is driven by a drive cylinder 49 attached to the rear end of the lifting plate 29 via a bracket 48.
It is installed so that it can move forward and backward on the top. As shown in FIG.
, a pair of chuck claws 45 and 45 attached thereon so as to be able to open and close horizontally, and a cylinder 47 for opening and closing the chuck claws that drives these to open and close from side to side. is Natsutranna 51
A U-shaped recess 43 slightly wider than the hole diameter of the nut N is formed at its tip so that the guide rod 55 can be pulled out even when inserted into the hole of the nut N.
Further, the chuck claws 45 are formed with arcuate surfaces 46 on the opposing inner sides thereof, which can hold the nut NM from the outside. It is configured so that it can be held on the nut Nu horizontal holding plate 42 in a closed state so as to be in main contact with the side surface of the part 44.

On the other hand, as shown in FIG. 1, the tightening mechanism 50 is disposed at the front end of the delivery mechanism 20, that is, at the position where the shaft S is conveyed, and the tightening mechanism 50 is located at the nut runner which is the main body of the tightening mechanism 50. 51 is attached to the column 53 so as to be movable up and down so that it can be lowered to the tightening position by being driven by the lifting cylinder 52. This nut runner 5] is shown in Fig. 6(b).
As shown in FIG. 2, in addition to the socket 54 having an engagement portion with the nut N on the inner surface of the lower end, a guide rod 55 is provided which penetrates into the holes of the washer W and the nut N and guides them onto the shaft S.
The guide rod 55 is attached so as to be able to protrude and retract from the socket 54 while always protruding downward from the socket 54. Furthermore, a positioning projection 56 is formed at the tip of the guide rod 55 to engage with a hole at the end of the shaft S.

Next, to explain the operation of the device configured in this way, in the standby position, the cross feed cylinder 24
As shown in FIG. 1, the gripping mechanism 25 is retracted so that the chuck mechanism 30 for holding the washer is positioned above the cylinder 11 for lifting the washer.

In this state, when the shaft S is sent into the tightening position, first, the pair of lifting cylinders 11, ] 6 and the rod 12
．． 17 is extended, and the small diameter portions 12a and 17a of the rod tip are inserted into the holes of the washer W and nut N that have been sent to the end positioning portion 6.8 of the feeder 5.7. 17c holds the washer W and nut N horizontally, and lifts them to the lowered position I of each chuck mechanism 30, 40 shown by the imaginary line in Figure 1.

Then, when the washer W and the nut N are lifted up to this position, the lifting cylinder 2 on the gripping mechanism main body 26 is moved.
7 lowers the elevating plate 29 to the position indicated by the imaginary line, narrows the chuck claws 33 and 33 of the washer holding chuck mechanism 3o, and separates the washer W held at the end of the rod 12 between the large diameter portion 34 and the small diameter portion. It is held so as to be placed on the stepped part formed between the part 35 and the part 35.

On the other hand, the drive cylinder 47 on the lifting plate 29 is
The nut holding chuck mechanism 40 is advanced to a position directly above the nut lifting cylinder] 6, and the horizontal holding plate 42
was inserted below the nut N, and the left and right chuck claws 45, 45 were narrowed to hold the nut N held at the tip of the rod 17, and the chunk mechanism 40 was then retreated to hold it. Place Natsuto directly above W and W.

Next, cylinder 11, 16 or rod 12 for lifting both sides.
．． 17, the transverse cylinder 24 advances the gripping mechanism 25 via the support plate 22 to the clamping position shown in phantom in FIG.

On the other hand, the nut runner 51 has each chuck mechanism 30.40.
When the washer W and nut N, which are held by 55 is sequentially inserted into the holes of the nut N and washer W, and the protrusion 56 at the tip thereof is engaged with the hole at the end of the shaft S.

When both are connected at this position, the gripping mechanism 25 further lowers the elevating plate 29 to insert the washer W into the shaft S, and places the knife N on the upper end of the shaft S. Next, socket 5 that was able to descend
4 or horizontal holding plate 42 as shown in FIG. 6(b).
It engages with the nut N held horizontally above and properly tightens it onto the shaft S. After this tightening is completed, the nut N is loosened, the gripping mechanism 25 is moved back, and after returning to its original standby state, the final tightening is performed to complete this series of steps.

(Effects) As described above, according to the present invention, the nut and washer lifted up from the supply section by the lifting means are gripped by the gripping means, and the tightening is performed by swinging the nuts and washers to the horizontal position. Even in such a case, the material to be tightened can be fed onto the shaft member without any problem while being held horizontally. Moreover, since the nut gripping means is provided with a horizontal holding part having a U-shaped recess at the tip in addition to the gripping claw, the nut received from the lifting means is placed on the horizontal holding part.
It becomes possible to temporarily assemble the tightened object to the shaft member by means of tightening in the same state, and it is possible to efficiently tighten and fix the object by avoiding inconveniences such as diagonal tightening. .

[Brief explanation of the drawing]

FIG. 1 is a side view of a device showing an embodiment of the present invention, FIG. 2 is a plan view showing the washer and nut feeders in the same device, and FIG. 3 is a side view showing the clamping mechanism of the same device. , Fig. 4 (aXb) and Fig. 5 (aXb) are a plan view and an end view showing the chuck mechanism for holding the washer and the chuck mechanism for holding the nut, respectively, and Fig. 6 (aXb)
1A and 1B are side and cross-sectional views of the nut runner shown at various stages of tightening. 5.7...Feeder]○...Lifting mechanism 1], 16...Lifting cylinder 20...Delivery mechanism 21...Transverse feed mechanism 25...Gripping mechanism 30...Washer holding Chuck mechanism 33...Chuck claw 40--Nut holding chuck mechanism 42...Horizontal holding plate 45...Chuck claw 49...Drive cylinder 50...Tightening mechanism 51...Nut runner

Claims (1)

[Scope of Claims] A pair of lifting means equipped with stepped rods that position and hold supplied washers and nuts and lift them horizontally; A washer gripping means arranged to be horizontally movable between the lifting means and the tightening position, a nut horizontal holding part having a U-shaped recess slightly wider than the hole diameter of the nut at its tip, and a gripping claw that can be opened and closed. and a nut gripping means disposed directly above the washer gripping means so as to be movable horizontally between the nut lifting means and the tightening position, and a nut and washer gripped by both the gripping means. A rod that penetrates each hole and guides both onto the shaft member to be tightened.
A nut and washer supply and tightening device comprising a nut tightening means that is freely retractable inside the tip.