JPH084976B2 - Assembly line screw tightening device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a screw tightening device for an assembly line.

(Prior Art) In an assembly line of an automobile or the like, a work is supported by a pallet, the pallet is conveyed by conveyor means, and work is sequentially applied to the work. In such an assembly line, there is known one in which a work head member is provided below the conveyor means so as to be able to move up and down, and work is performed by the work head member (see, for example, Japanese Utility Model Publication No. 52-21662).

(Problems to be Solved by the Invention) However, in the above-mentioned conventional one, since the elevating and lowering drive means for elevating and lowering the work head member is continuously provided below the work head member, it is vertically below the conveyor means. A large space for accommodating the work head members and the elevating and lowering drive means arranged in series is required, and the height of the conveyor means becomes high. Therefore, the worker performs work on the work conveyed by the conveyor means. It has the disadvantage of being difficult.

The present invention has been made in view of the above points, and an object of the present invention is to provide a screw tightening device for an assembly line that is compact in the vertical direction below the conveyor means.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides an assembly line in which work is applied to a work conveyed by a conveyor means while being supported by a pallet, and below the conveyor means. And a screwing socket member that is arranged so as to be able to move up and down, and that rotates by screwing while holding a nut that is a screwing operation target for the work, and a linking portion that is detachably linked to the screwing socket member. Elevating drive means for raising the screw tightening socket member with respect to the work, and work driving means for releasably linked to the screw tightening socket member to apply a rotational driving force for screw tightening work. To do. Then, the ascending drive means and the work drive means are provided at a position below the conveyor means and at a lateral position of the screw tightening socket member.
In addition, a linking portion of the ascending drive means and the work drive means, a first position for engaging the screw tightening socket member,
It is configured to move laterally with respect to the screw tightening socket member between the separated second position and engage with and disengage from the screw tightening socket member.

(Operation) In the case of the above configuration, at the time of work, the linking portion of the lifting drive means and the work driving means move laterally to the screw tightening socket member side to the first position, and the linking portion of the lift driving means functions as the screw tightening socket member. The screw-fastening socket member is engaged with the screw-driving means to raise the screw-fastening socket member, and the work-driving means is linked to the screw-fastening socket member to rotationally drive the screw-fastening socket member to screw the nut to the workpiece. It In this case, since the ascending drive means and the work drive means are arranged on the side of the screw tightening socket member, the space below the conveyor means can be made lower than the conventional case where the space is continuously provided in the vertical direction. It becomes possible to make the lower space compact in the vertical direction. In addition, even if the ascending drive means and the like are arranged laterally of the screw tightening socket member, the ascending drive means and the like are laterally moved to the first position and engaged with each other as described above, so that the screw tightening socket member Both ascending and screwing the nut are possible.

(Example) Hereinafter, the Example of this invention is described along drawing.

As shown in FIG. 1, which shows the overall configuration, the screw tightening device for the assembly line has a rear axle A as a work.
Is supported by a pallet B, is conveyed by the conveyor means C of the pallet B, and in the assembly line for sequentially performing work on the rear axle A, a lock nut described later from a parts feeder (not shown) located on the side. The lock nut D (see FIG. 6) supplied through the supply means 25 is temporarily fastened to the rear axle A.

The screw tightening socket member 1 for temporarily tightening the lock nut D to the rear axle A is the conveyor means C.
It is arranged so that it can be moved up and down. The screw tightening socket member 1 is a gate-shaped lifting member 2 side (moving member 38 described later).
The engaging pins 3,3 provided as a linking part on the side members 4,4 fixed to the screw-fastening socket member 1 (see FIG. 7).
By engaging with an engaged portion (not shown) formed on the upper and lower parts, and the lifting member 2 is lifted and lowered by the pair of cylinders 5, 5, the lifting member 2 can be lifted and lowered integrally with the lifting member 2. There is.

Each of the cylinders 5 and 5 includes a cylinder body 5a fixed to a side portion of the elevating member 2 and a piston rod 5c fitted in the cylinder body 5a and having a flange portion 5b. The piston rod 5c has a flange. By supplying the pressure oil to the oil chamber formed on the upper side of the portion 5b, the cylinder body 5a moves vertically with respect to the piston rod 5c.

Thus, the lifting member 2 including the moving member 38 and the like.
The cylinders 5, 5 and the engagement pins 3, 3 constitute a raising drive means for raising the screw tightening socket member 1 with respect to the pallet B.

As shown in FIG. 2, the screw tightening socket member 1 is rotatably supported in a casing 6 in a substantially horizontal direction and has a first rotating shaft 8 having a bevel gear 7 in an intermediate portion, and is rotatably supported in a substantially vertical direction. A second rotating shaft 10 having a bevel gear 9 at its lower end is provided at the lower part, and these are linked by the meshing of the bevel gears 7 and 9. Second rotating shaft 10
A holding portion 11 for supplying a lock nut D to the upper end thereof to engage and hold the lock nut D is connected to the upper end portion of the above, and the joint portion 12 of a working member 13 having a joint portion 12 at the lower end is connected thereto. Further, the first rotating shaft 8 has an engaging projection 14 having a rectangular cross section that projects to the outside of the casing 6.

In addition, the screw tightening socket member 1 includes the turning arm 21.
It is supported by and can turn. That is, the boss portion 21a of the revolving arm 21 is rotatably fitted onto the revolving center shaft 22, and the drive motor is mounted on the mount 23 fixedly mounted on the revolving center shaft 22.
The rotary shaft 24a of the drive motor 24 is linked to the boss portion 21a of the turning arm 21.

As a result, the screw tightening socket member 1 is located below the conveyor means C (work), and a work position for screw tightening work and a lock nut supply means 25 from a parts feeder (not shown) at the side of the conveyor means C. It is movable between a supply position where the lock nut D is supplied via the.

As shown in FIGS. 4 to 6, the lock nut supply means 25 cuts the lock nut D, which is rotatably supported by the base body 26 and is supplied from the parts feeder, from the other lock nuts D. A pair of rotating arms 27, 27 and a cylinder 2 in which the rotating arms 27, 27 are opened and closed via a connecting member 28.
9, a pair of holding arms 30, 30 rotatably supported by the base body 26 and supporting the lock nut D from both sides, and a spring 31 for constantly urging one of the holding arms 30 in the lock nut holding direction. Against the spring force of the spring 31,
Another cylinder 32 for rotating the holding arms 30, 30 in the opening direction via the lock nut D. An engaging member 33 that engages with the lock nut D is attached to the tip of the piston rod 32a of the cylinder 32.

As shown in FIG. 3, on the side of the screw-fastening socket member 1, a work drive means 35 that is linked to the screw-fastening socket member 1 from the side and performs a working operation can be traversed and can be moved laterally. It is provided. The work drive means 35 is traversable by an air cylinder 37 between a first position connected to the screw tightening socket member 1 and a second position separated from the first position. The air cylinder 37 is fixed to the elevating member 2, and the driving of the air cylinder 37 causes the moving member 38 supporting the work driving means 35 to move along the guide bars 45, 45 provided on both sides thereof. Has become. Therefore, the work drive means 35 is supported by the moving member 38 which constitutes the ascending drive means.

Further, the engaging pins 3, 3 are fixed to the front portion of the moving member 38, and the nut runner 39 is fixed to the rear portion. The output shaft 39a of the nut runner 39 is connected to one end of a tubular rotation shaft 41 via a bush 40. The other end of the rotary shaft 41 is connected to one end of another solid rotary shaft 42, and the other end of the rotary shaft 42 has a through hole having a rectangular cross section and engages with the engaging protrusion 14. The cylindrical member 43 is attached via a pin (not shown) so that it can be finely moved. A spring 44 is provided between the rotary shaft 41 and the tubular member 43. The work drive means 35 is configured in this manner.

Further, as shown in FIG. 7, a pair of movable sleeves 46, 46 slidably fitted on the guide bars 45, 45 are provided above the moving member 38 via annular members 47, 47. The annular members 47, 47 are attached and are connected to the tip of the piston rod 37a of the air cylinder 37 via a connecting member 48.

That is, the air cylinder 37 is driven to move the moving member 38.
Moves laterally to the first position, the engaging pins 3, 3 of the ascending drive means engage the engaged portions of the side members 4, 4 with the tubular member 43 of the work drive means 35. The protrusions 14 are adapted to be engaged with each other. Then, the screw tightening socket member 1 connected through the engagement pins 3 and 3 is lifted by the ascending drive of the cylinders 5 and 5, and the nut runner 39 is
Driving force is transmitted through the engagement of the cylindrical member 43, the engaging convex portion 14, and the pair of bevel gears 7 and 9 to rotate the holding portion 11 of the screw tightening socket member 1 to rotate the lock nut. The rear axle A of D is screwed.

Further, as shown in FIG. 8, the screw tightening socket member 1 has the engaging portions 51, 51 slidably engaged with the rail portions 50, 50 provided at the end of the revolving arm 21. Member
4, 4 are erected sideways, and the engaging portions 51, 5 of the side members 4, 4
On the side opposite to 1 is provided an engaged portion with which the above-mentioned engaging pins 3, 3 engage. Therefore, the screw tightening socket member 1 is supported by the revolving arm 21 so as to be vertically movable. In the figure, reference numeral 52 denotes a buffer means, and this buffer means 52
Is for stopping the revolving arm 21 at the supply position of the lock nut D without impact.

In the above configuration, when the rear axle A (workpiece) placed on the pallet B is conveyed to the working position by the conveyor means C, first, the screw tightening socket member 1
The moving member 38 located on the side of is moved by the operation of the air cylinder 37, and the engagement pins 3, 3 are engaged with the engaged portions of the side members 4, 4 by the engaging protrusions 14. Engage with the tubular members 43, respectively.

Then, the cylinders 5 and 5 are operated and the lifting member 2 is lifted. At that time, the screw-fastening socket member 1 also rises along the rail portions 50, 50 of the revolving arm 21 due to the elevation of the elevating member 2.

After that, when the nut runner 39 is driven, the rotational force is transmitted to the screw tightening socket member 1 side by the engagement between the engagement convex portion 14 and the tubular member 43, and the lock nut D supported by the holding portion 11 is moved to the rear axle. Temporarily tightened to A.

After the temporary tightening work is completed, the elevating member 2 is lowered by its own weight of the elevating member 2 supporting the work driving means 35, and thus the screw tightening socket member 1 is lowered.

Thereafter, similarly, the work of temporarily tightening the lock nut D to the next rear axle A is performed.

The lock nut D can be easily supplied to the holding portion 11 of the screw tightening socket member 1 by rotating the swing arm 21 by the drive motor 24.

The present invention can be applied not only to the temporary fastening work but also to the final fastening work.

(Effects of the Invention) As described above, according to the present invention, since the ascending drive means and the work drive means are provided on the side of the screw tightening socket member below the conveyor means, the vertical space of the space below the conveyor means is compact. Therefore, it is possible to eliminate the inconvenience that it is difficult for the worker to perform the work because the vertical position of the conveyor means becomes too high. Moreover, even if the ascending drive means and the like are arranged laterally of the screw tightening socket member, the ascending drive means and the like are laterally moved to the first position so as to engage with the screw tightening socket member. The screw tightening of the socket member and the screw tightening of the nut with respect to the work can be performed together.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an overall configuration diagram of a screw tightening device for an assembly line, FIG. 2 is a sectional view of a screw tightening socket member, FIG. 3 is a sectional view of a work driving means, FIG. 4 is a side view of the lock nut supply means, FIG. 5 is a front view of the lock nut supply means, and FIG. 6 is VI- of FIG.
Fig. 7 is a cross-sectional view taken along line VI, Fig. 7 is a plan view of the screw tightening device, a part of which is omitted, and Fig. 8 is an explanatory view of a state in which the screw tightening socket member is attached to the swivel arm. A: Rear axle (work), B: Pallet, C:
... Conveyor means, D ... Lock nut (nut), 1 ...
… Screw tightening socket member, 2 …… elevating member (raising drive means), 3… engaging pin (coupling part), 5 …… cylinder (raising drive means), 35 …… work drive means, 37 …… cylinder ( Lifting drive means, work drive means), 38 ... Moving member (lifting drive means, work drive means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyoji Hida 1 Oka, Okimura, Nishiharu-cho, Nishikasugai-gun, Aichi Sanyo Kiko Co., Ltd.

Claims (1)

[Claims] 1. A screw tightening device for an assembly line in which work is applied to a work carried by a conveyor means while being supported by a pallet, which is arranged below the conveyor means so as to be able to move up and down. A screw tightening socket member that holds a nut as a screw tightening work and rotates by screw tightening, and a linking portion that is detachably linked to the screw tightening socket member, and raises the screw tightening socket member with respect to the work. And a work driving means for releasably linking to the screw tightening socket member to apply a rotation driving force for screw tightening work, wherein the lift driving means and the work driving means are the conveyor means. Is provided at a lower position of the screw tightening socket member and is located at a lateral position of the screw tightening socket member. The step moves laterally with respect to the screw-fastening socket member between a first position engaging the screw-fastening socket member and a spaced second position to disengage from the screw-fastening socket member. A screw tightening device for an assembly line characterized by being configured.