JPH06320351A - Transferring conveying device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rational and compact transfer / conveyance device capable of directly transferring a work between a shuttle conveyor and a work positioning / fixing device. [Structure] A pair of left and right table bases 33 radially projecting from both ends of a swivel shaft 32 whose both ends are rotatably supported, and mounted on the table base 33 according to the type of work. Workpiece positioning and fixing means 34, 35 and a predetermined table base 33
And a shuttle beam 52 that extends between the pair of left and right table bases 33 at the work exchange position and extends in a direction intersecting with the rotation shaft 32. A work receiving means 64 attached to the beam 52 and capable of gripping a work, and a work receiving means 64 for delivering the work between the work receiving means 64 and the work positioning and fixing means of the pair of left and right table bases 33 at the work exchange position. It is characterized in that it comprises a shuttle beam drive means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact transfer and transfer device for transferring a work between a work positioning and fixing device for positioning and fixing a plurality of kinds of works at predetermined positions and a shuttle conveyor for transferring the work. In particular, it is suitable for application to body frame assembly equipment for passenger cars.

[0002]

2. Description of the Related Art A single line manufactured in a state in which multiple types of vehicles are mixed in an automobile manufacturing line can share a part of the manufacturing facility, so that the manufacturing rate is improved in combination with the improvement of the facility operating rate. The equipment can be made compact.

[0003] Japanese Patent Laid-Open No. 1-3 proposed with such a purpose.
The work positioning and fixing device of Japanese Patent No. 10827 is a facility in which a plurality of sets of table bases to which a positioning locator and a clamping jig are respectively attached corresponding to a plurality of types of works are radially mounted on a rotatable swivel shaft for indexing.
After indexing and rotating a table base that corresponds to the type of work to be positioned, represented by a vehicle body panel, etc., fix the above-mentioned work in the positioned state on this table base, and then perform a predetermined work on this work. ing.

A conventional workpiece positioning and fixing device is arranged laterally of an automobile manufacturing line so that its turning axis is parallel to the workpiece conveying direction, and it is installed between a table base in an upward state and an overhead conveyor. In addition to handing over the work, it is common for the worker to attach and detach the work directly to and from the table base.

[0005]

In a manufacturing line for automobiles and the like, a shuttle conveyor of the type in which a work such as a vehicle body panel is picked up and transferred from below by a shuttle beam requires a very simple transport mechanism and power source. For this reason, it is most often used as a work transfer means in line equipment.

In the work positioning and fixing device disclosed in Japanese Patent Laid-Open No. 1-310827, its turning axis is set parallel to the manufacturing line to facilitate the transfer of the work between the table base and the manufacturing line. However, since the table base rotates about the swivel axis, it is difficult to place the shuttle beam of the shuttle conveyor close to this workpiece positioning and fixing device, and it is necessary to directly deliver the workpiece between them. Was virtually impossible.

For this reason, the use of the workpiece positioning and fixing device has not necessarily brought about a problem in terms of equipment investment, such as the need to newly prepare an overhead carrier.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rational and compact transfer / conveyance device capable of directly transferring a work between a shuttle conveyor and a work positioning / fixing device.

[0009]

A transfer carrier according to the present invention has a swivel shaft whose both ends are rotatably supported by bearings, and a plurality of sets of radial projections from both ends of the swivel shaft. A pair of left and right table bases, work positioning and fixing means respectively mounted on the plurality of sets of table bases corresponding to the type of work, and a predetermined table base connected to the swivel shaft to replace the predetermined work bases. A rotating shaft indexing means for rotating the indexing shaft, a shuttle beam extending in a direction intersecting with the rotating shaft and located between the pair of left and right table bases at the workpiece exchange position, and attached to the shuttle beam. And a pair of left and right tables at the work exchange position with the work receiving means capable of gripping the work Is characterized in that comprises a shuttle beam driving means for passing the workpiece between the over scan of the workpiece positioning and fixing means.

[0010]

The rotary table indexing means is operated to index and rotate a predetermined table base to the work exchange position. At this time,
Since the shuttle beam is located between the pair of left and right table bases, the problem that the existence of the shuttle beam hinders the turning operation of the table base does not occur.

Then, the shuttle beam is operated by the shuttle beam driving means to transfer the work held in the work receiving means in the previous process onto a predetermined table base indexed to the work exchange position, and this predetermined work is carried out. The work is positioned and fixed on the table base by the work positioning and fixing means attached to the table base. Then, in this state, a predetermined work is performed on the work, and after the function of the work positioning and fixing means is released, the shuttle beam driving means is operated again to remove the work performed by the work receiving means of the shuttle beam. Lifted from a predetermined table base and carried out to the next step.

[0012] When the work which has been worked is lifted from the table base by the shuttle beam, the turning axis indexing means is actuated again to index and rotate the table base corresponding to the work located in the previous process to the work exchange position. Then, along with the operation of the shuttle beam described above, a new work is transferred onto a predetermined table base that has been indexed to the work replacement position from the previous process, and such work is continuously repeated.

It should be noted that it is not necessary to carry out all the work loading and unloading with respect to the work exchange position by the shuttle beam, and it is possible to carry out either the work loading or unloading operation by the shuttle beam.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transfer vehicle according to the present invention is installed in a passenger car.
The plane structure of one embodiment applied to the assembly line of the floor
1 and 2 showing the structure and FIGS. 3 and 4 showing the side structure thereof.
As shown, the rear floor portion in this embodiment is
A pair of rear side members W _SAnd these rear side men
W_SCross member W that interconnects_CThe main part is
Rear frame W made_RFAnd this rear frame W_RFUp
Rear floor pan W that can be stacked on_FPIs roughly composed of
ing.

[0015] Also, assembly line of the present embodiment, the vehicle type cross member W _C there is only one in the central portion as described above, these intervals there crossmember W _C is on the front portion and the central portion is narrow vehicles When, with these wide interval models there crossmember W _C is on the front portion and the central portion, the cross member W _C is the total four types of the vehicles in each of the front end portion and the central portion and the rear end vehicle The rear side member W _S , the cross member W _C , and the rear floor pan W _FP having a shape corresponding to these four types of vehicles are brought into respective predetermined work stations according to the production plan. It is supposed to be done. The work stations are set at regular intervals along the assembly line, and as will be described later, a frame mounting position P ₁ , a frame temporary mounting position P ₂ , frame additional hitting positions P ₃ , P ₄ , a floor pan mounting position P ₅ ,
The floor pan temporary positions P ₆ are arranged in a straight line in this order.

As means for transporting the work between these work stations, the carry-out position P ₀ of the rear side member W _S machined into a predetermined shape corresponding to each vehicle type according to the production plan and the frame mounting position P ₁ The first overhead carrier 11 for reciprocating between the frame and the frame to transfer the work between them, and the frame mounting position P ₁ and the frame temporary mounting position P ₂ for reciprocating between them. Second overhead transfer machine 12 for transferring work between the two
And a single shuttle conveyor 13 that extends from the frame temporary mounting position P ₂ to the rear floor overstrike position P ₇ for overstrike the rear floor, and that simultaneously carries out the transfer of works between these adjacent work stations. According to the production plan, the rear floor pan W _FP , which is processed into a predetermined shape corresponding to each vehicle type, is reciprocally moved between an unillustrated carry-out position of the rear floor pan W _FP and the floor pan mounting position P ₅ to form a rear floor pan therebetween. etc. the third overhead conveyor 14 is deployed for transferring the W _FP.

The above-mentioned three overhead transfer machines 1
The basic structures of 1, 12, 14 are all the same, and have a lifting mechanism and a reciprocating drive mechanism that repeatedly moves between adjacent work stations, and a plurality of pre-installed positioning locators (not shown) are used to work. A predetermined positioning locator according to the form of the overhead transporter 11,
While positioning the workpiece with respect to 12 and 14, a predetermined clamp jig corresponding to the shape of the workpiece can selectively grip the workpiece from a plurality of pre-assembled clamp jigs (not shown).

At the frame assembly position P ₁ where the pair of left and right rear side members W _S are carried in by the first overhead carrier 11, the rear frame assembly work table 15 is installed.
Are installed on the work floor 16, and around the rear frame assembly work table 15, there are provided a plurality of pallets (not shown) on which a plurality of types of cross members W _C corresponding to respective vehicle types are respectively placed in an aligned state. It is arranged. Therefore, the operator selects the cross member W _C of the vehicle type corresponding to the rear side member W _S carried into the rear frame assembly workbench 15 from the pallet described above, and selects the cross member W _C together with the rear side assembly W _S with the rear frame assembly workbench. It is designed to be temporarily assembled on top of 15. For this reason, a positioning locator (not shown) or the like, which is movable in three-dimensional directions corresponding to the type of vehicle to be carried in, is attached to the rear frame assembling work table 15.

Similarly, the third overhead carrier 14
A rear floor assembly worktable 17 is installed on the work floor 16 at a floor pan assembly position P ₅ where the rear floor pan W _FP is carried in by the rear floor pan W _FP. A locator (not shown) for positioning, which is movable in three dimensions depending on the type of vehicle, is installed.

In addition, at the frame additional hitting positions P ₃ and P ₄ , a pair of left and right frame holding bases 18 and 19 installed on the work floor 16 and facing each other across the frame holding bases 18 and 19, respectively. Welding robots 20 and 21 are installed, and these frame holding tables 18 and 19 are provided.
A positioning locator, a clamp jig, and the like (not shown) that are movable in the three-dimensional directions corresponding to the type of vehicle to be carried in are attached to each.

In the present embodiment, a pair of left and right welding robots 2 is further provided between the adjacent frame additional hit positions P ₃ and P _4.
2 deployed, by respectively increasing strike welding predetermined locations of the rear frame W _RF on the frame widening strike position P _3, P _4, depending on the type of the rear frame W _RF, so that it can follow the conveying speed of the assembly line Is considered.

Similarly, the rear floor additional hitting position P ₇
Is provided with a floor holding table 23 installed on the work floor 16 and a pair of left and right welding robots 24 facing each other with the floor holding table 23 interposed therebetween. Positioning locators, clamp jigs, etc. (not shown) that are movable in three dimensions corresponding to the type of vehicle to be carried in are assembled.

The rear frame temporarily assembled by the rear frame W _RF at the frame assembly position P ₁ is the second in the frame tacking position P ₂ which is carried by an overhead conveyor 12 in this state, to be described later A positioning / fixing device 25 and a pair of left and right frame tack welding robots that face each other by sandwiching the rear frame positioning / fixing device 25 and perform tack welding of the rear frame W _{RF held} by the rear frame positioning / fixing device 25. Are arranged.

[0024] Similarly, the rear floor which is temporarily assembled at a position P ₅ assembled floor pan, the floor pan tacking position P ₆ which is carried by the shuttle conveyor 13 described above in this state, the rear floor positioning and fixing device 27 And a pair of left and right floor tacking welding robots 28 that face each other across the rear floor positioning and securing device 27 and perform tack welding of the rear floor held by the rear floor positioning and securing device 27.

As shown in FIG. 5 showing the plane structure of the rear frame positioning and fixing device 25 in this embodiment and FIGS. 6 and 7 showing the front shape and the side shape thereof, respectively, as shown in FIG. A pair of pedestals 30 that face each other across the pit 29 dug in the direction perpendicular to the production line.
Both ends of the swivel shaft 32 are rotatably supported on the upper side by bearings 31. Revolving axis 3 that crosses the pit 29
The central portion of 2 is formed in a rectangular shape, and four pairs of left and right table bases 33 are radially fixed to both ends of the rectangular portion in this embodiment.

On the upper surface of each of these table bases 33,
A plurality of positioning locators 34 laid in accordance with the rear frame W _RF mode, a plurality of clamp jig 35 for fixing the rear frame W _RF at the positioning state is fixed, respectively.

Positioning locator 34 in this embodiment
Is a conical projection that fits into a positioning hole (not shown) formed in the rear frame W _RF and is integrally provided on the upper surface of each table base 33. Further, as shown in FIG. 8 showing an appearance of an example of the clamp jig 35 in the present embodiment and FIG. 9 showing its planar shape, each clamp jig 35 has a clamp arm 37 whose opening and closing can be switched by a fluid pressure cylinder 36. The clamp jig 35 corresponding to each vehicle type has a frame temporary welding robot 26.
Table base 3 that does not interfere with tack welding by
3 is attached to each of the surfaces.

That is, a receiving member 38 for holding the rear frame W _RF is provided on the table base 33 in a protruding manner, and a clamp arm 37 is provided on the receiving member 38 via a link 39.
The central portion of the is pivotally mounted, and the piston rod 40 of the fluid pressure cylinder 36 connected to the receiving metal 38 is pinned to the base end portion of the clamp arm 37.

The above-mentioned overhead carrier 1
The basic structure of the clamp jigs mounted on 1, 12, and 14 and the main parts of the clamp jigs assembled on the frame holders 18 and 19 and the floor holder 23 is shown in FIGS. 8 and 9, respectively. It is substantially the same as the jig 35.

Jig turning motor 4 fixed in pit 29
Drive sprocket 4 connected to gear 1 via reduction gear 42
3 and a driven sprocket 44 fixed to one end of the swivel shaft 32 are connected via an endless drive chain 45, and a table corresponding to the rear frame W _RF carried in from the frame mounting position P _1. The turning shaft 32 is indexed and rotated so that the base 33 is located at the uppermost position, which is the workpiece replacement position of the present invention. In this case, the accurate indexing rotation position of the swivel shaft 32 is determined by setting the fitting cylinder portion 47 into which the tip ends of the piston rods (not shown) of the pair of left and right knock cylinders 46 provided on the gantry 30 can be tightly fitted. It is provided so as to project laterally and is compensated by these fittings.

That is, prior to the operation of the jig turning motor 41, the piston 37 of the knock cylinder 46 is removed from the fitting cylinder portion 47 of the table base 33, and the turning shaft 32 can be rotated with respect to the gantry 30. Move. In this state, the jig rotation motor 41 is driven so that the predetermined table base 33 moves to the work exchange position.
After performing indexing rotation of 2, knock cylinder 46 again
Is operated to fit the piston in the fitting cylinder portion 47 of the table base 33, and the turning shaft 32 is fixed at the accurate indexing position.

The rear floor positioning and fixing device 27 installed at the floor pan temporary mounting position P ₆ is arranged so that it can be indexed and rotated so as to be orthogonal to the assembly line.
A plurality of pairs of left and right table bases 49 are radially fixed to both sides of the table 8 (four pairs in this embodiment), and a plurality of positioning locators 50 laid out according to the form of the rear floor are provided on the upper surface of each table base 49. , Multiple clamp jigs 5 for fixing the rear floor in a positioned state
1 and 2 are fixed to each other and have basically the same configuration as the rear frame positioning and fixing device 25 described above, and therefore further description will be omitted.

As shown in FIGS. 2 and 4 and FIG. 10 showing the conceptual structure of the shuttle conveyor 13 in the present embodiment, it extends along the assembly line between the pair of left and right table bases 33 at the work exchange position. A shuttle beam 52 is located, and a plurality of guides for holding the shuttle beam 52 in a reciprocating manner along an assembly line are provided above the columns 53 installed in the pits 29 between the adjacent work stations. A beam holder 55, on which a roller 54 is rotatably mounted, is provided so as to be able to move up and down. In the middle of the shuttle beam 52, a rack (not shown) that meshes with a drive gear (not shown) that meshes with a normal / reverse rotation motor (not shown) via a speed reducer is engraved. The shuttle beam 52 is assembled by the forward / reverse operation of the forward / reverse rotation motor. It reciprocates a distance corresponding to the distance between adjacent work stations along the line.

An ejector beam 56 extending in parallel with the shuttle beam 52 is provided at the upper end of the column 53, and the ejector beam 56 is reciprocated along one end of the ejector beam 56 along the assembly line. A beam driving actuator (not shown) that can be driven is connected. A drive pinion 60 that is integral with a pinion shaft 59 that is rotatably held in a pinion case 58 that is attached to the upper end of the support column 53 meshes with a rack 57 that is cut in the middle of the ejector beam 56. The driven pinion 61, which is coaxial with the drive pinion 60 and is provided on the pinion shaft 59, engages with the rack 63 formed on the lower end of the elevating rod 62 projecting downward from the lower surface of the beam holder 55. .

Therefore, the operation of the above-mentioned beam driving actuator and the forward / reverse rotation motor is alternately switched to repeat the ascending, advancing, descending, and reversing of the shuttle beam 52 in order to transfer the work between the adjacent work stations. The shuttle beam 52, the column 53, the beam holder 55, the forward / reverse rotation motor, the ejector beam 56, the rack 57, the pinion case 58,
Pinion shaft 59, drive pinion 60, driven pinion 61,
The elevating rod 62, the rack 63, the beam driving actuator, and the like constitute the shuttle conveyor 13 of the present invention.

On the upper surface of the shuttle beam 52, work receiving means 64 capable of changing the gripping position according to the type of work is attached at a constant interval corresponding to the interval of the work stations. 11 shows a plane structure of the work receiving means 64 in FIG. 11 and a side view thereof in FIG. 12, and further, a cross section taken along line XIII-XIII in FIG.
The sectional structure taken along the line IV-XIV is shown in FIGS. 13 and 14, respectively.

That is, the work receiving means 6 in this embodiment.
4 is a movable positioning locator 66 for a cross member, which has a locator pin 65 that can be fitted into a positioning hole W _HF formed in a cross member W _C located at the front end of the rear frame W _RF , and a movable positioning locator 66 for this cross member. Positioning locator 6
Of the movable positioning locator 68 for the side member, which has a locator pin 67 that can be fitted in the positioning holes W _HS formed in the rear side members W _S on the left and right of the rear member 6, and the movable positioning locator 68 for the side member. A clamp jig 69 that is positioned rearward and is provided in the center of the rear frame W _RF and that holds the cross member W _C , and a rear end portion of the rear frame W _RF that is arranged behind the clamp jig 69. And a positioning locator 70 capable of moving up and down to receive the provided cross member W _C.

The cross member movable positioning locator 66 is slidably attached to the shuttle beam 52 along the assembly line, and the positioning hole W is formed in the cross member W _C located at the front end of the rear frame W _RF. A slider 71 having a locator pin 65 that can be fitted to the _HF projecting upward, and a slider 71 for the shuttle beam 52.
And a slider drive cylinder 72 for switching the relative position of the front and rear according to the type of the rear frame W _RF .

The side member movable positioning locator 68 is reciprocally attached to the shuttle beam 52 in a direction perpendicular to the assembly line, and is provided in the positioning holes W _HS formed in the left and right rear side members W _S. A pair of locator holders 73 each provided with a locator pin 67 that can be fitted to each other, and a pair of locator holder drive cylinders that are mounted on the shuttle beam 52 in the right and left reverse directions to drive the locator holders 73 in the left and right reverse directions at the same time. 74 and 74 form a main part.

On the other hand, the clamp jig 69 is a shuttle.
Rear frame W by conveyor 13 _RFShut during transport
Rear beam W to rear frame W_RFWill drop out
This is to prevent such dangers, and basically
The structure is almost the same as that of the clamp jig 35 described above.
That is, the rear frame W_RFCrossing provided in the center of
Number W_CReceiving 75 to receive and against this receiving 75
Clamp arm 76 that can be opened and closed freely
Fluid pressure cylinder 77 for opening and closing the lamp arm 76
The main part is composed of and. Furthermore, the clan of this embodiment
Rear frame W for the jig 69_RFLocated in the center of
Loss Member W_CPositioning hole W formed in_HCCan be fitted to
Locator pin 78 is provided.

In the positioning locator 70, a receiving plate 79 for receiving a cross member W _C provided at the rear end of the rear frame W _RF is provided with a receiving plate driving cylinder 81 attached to a bracket 80 integrated with the shuttle beam 52. In addition to being mounted so as to be able to move up and down, a locator pin 82 that can be fitted into a positioning hole W _HR formed in a cross member W _C located at the rear end of the rear frame W _RF is provided.

Then, the slider driving cylinder 72, the locator holder driving cylinder 74, or the receiving plate driving cylinder 81 is operated depending on the type of the rear frame W _RF , and the switching movement of the locator pin 67 and the locator pin 78 and the receiving plate 79 are performed. Evacuation movement is made.

Therefore, on the rear frame assembly workbench 15 at the frame assembly position P ₁ , the first overhead from the carry-out position (not shown) of the rear side member W _S machined into a predetermined shape corresponding to each vehicle type. The rear side member W _S according to the production plan is carried in by the carrier machine 11, the first overhead carrier machine 11 returns to the above-mentioned carry-out position again, and stands by there for the carry-out operation of the next rear side member W _S. . On the other hand, the operator selects the cross member W _C of the vehicle type corresponding to the rear side member W _S carried on the rear frame assembly workbench 15 from the pallet and selects the rear side member W _S on the rear frame assembly workbench 15. Accurately and temporarily assemble this cross member W _C. The temporarily assembled rear frame W _RF is the second overhead carrier 1.
2 is lifted from the rear frame assembling work table 15 as it is, and is carried out to the frame temporary mounting position P ₂ .

The second overhead carrier 1
In synchronism with the unloading operation of the rear frame W _RF by 2, the carrying-in operation of the rear side member W _S by the above-mentioned first overhead transfer machine 11 is performed.

[0045] Prior to temporarily assembled to the rear frame W _RF from the work platform 15 assembled rear frame is carried to the frame tacking position P ₂ by the second overhead conveyor 12, the rear frame of the frame tacking position P ₂ The positioning and fixing device 25 performs indexing rotation of the turning shaft 32 by the jig turning motor 41 so that the table base 33 corresponding to the type of the rear frame W _RF is located at the work exchange position. Then, the rear overhead frame W _RF is placed on the table base 33 at the work exchange position by the second overhead transfer machine 12, and the second overhead transfer machine 12 returns to the frame assembly P ₁ again. Stand by for carrying out the rear side member W _S of. On the other hand, the rear frame W _RF positioned with respect to the table base 33 by the positioning locator 34 is further fixed integrally with the table base 33 by the clamp jig 35, and in this state, a pair of left and right frame temporary The tack welding robot 26 performs tack welding of the rear frame W _RF .

When performing the indexing rotation of the swivel shaft 32, the shuttle beam 52 is positioned at the work exchange position before the indexing rotation of the swivel shaft 32, and the table base 3 is at the work exchange position.
3 is in the middle of conveyance from the elevated position where the work is lifted upward by the work receiving means 64 to the frame additional striking position P ₃ side, and the shuttle beam 5 with respect to the rotation of the swivel shaft 32 is rotated.
No interference of 2 occurs. Further, prior to the temporary welding of the rear frame W _RF by the pair of left and right frame temporary welding robots 26, the workpiece receiving means 64 of the shuttle beam 52 in the lowered position is in a standby state between the table base 33 in the workpiece exchange position. Has become.

Rear frame W_RFOf tack welding
And the rear frame W by the clamp jig 35_RFFixed
The table table in the work replacement position is released at this point.
Shuttle beam 5 that is in a standby state between base 33
The second work receiving means 64 operates the ejector beam 56.
To raise from the lowered position to the raised position.
Rear frame W temporarily attached to the table base 33
_RFLift up. And the second overhead carrier
12 is the frame mounting position P₁From frame tacking position
P₂To the frame assembly position P again.₁While returning to
The forward / reverse rotation motor is operated in the forward direction to drive the shuttle beam 52.
The rear receiving frame 64 is temporarily attached to the rear frame W._RFThe frame
Additional hitting position P₃To the side. And eject
From the raised position to the lowered position by the operation of the tab beam 56
Down, frame additional hitting position P ₃Frame holder 1
Rear frame W temporarily attached on 8_RFIs reprinted. Only
After that, the forward / reverse rotation motor operates in reverse to increase the number of frames
Setting P₃The work receiving means 64 located at the descending end is reset again.
At the workpiece replacement position of the yaw frame positioning and fixing device 25.
Return to the table base 33 and wait as described above.
It becomes a state.

When the temporarily attached rear frame W _RF is carried by the shuttle conveyor 13 onto the frame holding base 18 at the frame overstrike position P ₃ , the rear locator is positioned with respect to the frame holding base 18 by the positioning locator. The frame W _RF is further integrally fixed to the frame holding base 18 by a clamp jig, and in this state, the pair of left and right welding robots 20 and, if necessary, the pair of left and right welding robots 22 are used to form the rear frame. W _RF incremental welding is performed.

When the over-welding of the rear frame W _RF at the frame over-pressing position P ₃ is completed, the transfer operation of the rear frame W _RF from the frame temporary mounting position P ₂ to the frame over-pressing position P ₃ by the shuttle conveyor 13 is performed. In synchronism with the above, the rear frame W _RF is transported from the frame over-strike position P ₃ to the next frame over-strike position P ₄ .

The additional welding work of the rear frame W _RF by the welding robots 21 and 22 on the frame holding table 19 at the frame additional punching position P ₄ is almost the same as the previous incremental welding work at the frame additional punching position P _3. At the timing, the rear frame W _RF is transported from the frame additional punching position P ₄ to the floor pan assembly position P ₅ by the shuttle conveyor 13 when the additional welding is completed.

On the rear floor assembly workbench 17 located at the floor pan assembly position P ₅ , a rear overhead pan W _FP machined into a predetermined shape corresponding to each vehicle type is moved from a carry-out position (not shown) to a third overhead carrier. The rear floor pan W _FP according to the production plan is carried in at 14, and the third overhead carrier 14 returns to the above-mentioned carry-out position again, where it waits for the next carry-out operation of the rear floor pan W _FP .
The temporarily assembled rear floor is lifted up from the rear floor assembling work table 17 by the shuttle conveyor 13 as it is and carried out to the floor pan temporary attaching position P ₆ .

Before the temporarily assembled rear floor from the rear floor assembly work table 17 is carried into the floor pan temporary mounting position P ₆ by the shuttle conveyor 13, the rear floor positioning and fixing device 27 at the floor pan temporary mounting position P ₆ is
The turning shaft 48 is indexed and rotated so that the table base 49 corresponding to the type of the rear floor is located at the work exchange position. Then, the rear floor positioned by the positioning locator 50 with respect to the table base 49 is further fixed by the clamp jig 51 to the table base 4.
The rear floor is temporarily fixed to the rear floor 9 by the pair of left and right floor temporary welding robots 28 in this state.

The rear frame positioning described above
As in the case of the fixing device 25, the indexing rotation of the pivot shaft 48 is performed.
When rolling, the shuttle beam 52 indexes the turning shaft 48.
The table at the work replacement position before the rotation
The work is moved upward from the base 49 by the work receiving means 64.
From the ascended position lifted up to the rear floor, additional hit position P ₇
Is in the middle of transportation to the side, and shuts against rotation of the swivel shaft 48.
The interference of the light beam 52 does not occur at all. Also, a pair of left and right
Floor tacking Welding robot 28 tacking the rear floor temporarily
Of shuttle beam 52 in the lowered position prior to welding.
When the work receiving means 64 is at the work exchange position,
It is in a stand-by state between the base 49.

When the temporary welding of the rear floor is completed, the fixing of the rear floor by the clamp jig 51 is released, and at this point, the workpiece receiving device for the shuttle beam 52 is placed between the table bases 49 at the workpiece exchanging position. The means 64 moves up from the lowered position to the raised position by the operation of the ejector beam 56, and lifts the temporarily attached rear floor on the table base 49 as described above. Next, the forward / reverse rotation motor is operated in the forward direction to move the shuttle beam
The work receiving means 64 conveys the temporarily attached rear floor to the rear floor additional hitting position P ₇ side. Then, the ejector beam 56 is operated to descend from the raised position to the lowered position, and the temporarily mounted rear floor is transferred onto the floor holding table 23 at the rear floor additional hitting position P ₇ . After that, the forward / reverse rotation motor operates in the reverse direction, and the work receiving means 64 positioned at the lower end at the rear floor additional hitting position P ₇ returns again to between the table base 49 at the work exchange position of the rear floor positioning and fixing device 27, and the above-mentioned operation is performed. It becomes a standby state.

When the temporarily attached rear floor is carried by the shuttle conveyor 13 onto the floor holding table 23 at the rear floor additional striking position P ₇ , the rear floor positioned to the floor holding table 23 by the positioning locator (not shown) Further, the rear floor 23 is integrally fixed to the floor holding table 23 by a clamp jig (not shown), and in this state, the rear floor is additionally welded by the pair of welding robots 24. In this case, when the time required for the over-welding of the rear floor is longer than the transportation period of the rear floor by the shuttle conveyor 13, as in the case of the over-taking of the rear frame W _RF described above, a plurality of rear floor over-pressing positions are set. It is necessary to set up and distribute multiple work stations to the rear floor additional hammering position and perform the multiple welding of the rear floor in multiple stages.

In this way, the rear floor after completion of the additional welding at the rear floor additional welding position P ₇ is carried out by the shuttle conveyor 13 to the next work station (not shown).

In this embodiment, the transfer / conveyance apparatus of the present invention is applied to the assembly work of the rear floor of a passenger car. However, it is naturally applicable to processing work and inspection work for a plurality of kinds of works. it can.

[0058]

According to the transfer / conveyance apparatus of the present invention, the shuttle beam and the turning axis of the workpiece positioning fixing jig are set to intersect each other, and the shuttle beam is positioned between the pair of left and right table bases. Since the rotation axis can be indexed and rotated regardless of the presence of the shuttle beam, it becomes possible to directly transfer the work between the shuttle beam and the table base, which greatly reduces the installation space for these. It can be made compact and improved to rational equipment.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment in which the transfer / conveyance apparatus according to the present invention is applied to an assembly line of a rear floor portion of a passenger car together with FIG.

FIG. 2 is a plan view of an embodiment in which the transfer / conveyance apparatus according to the present invention is applied to an assembly line of a rear floor portion of a passenger car together with FIG.

FIG. 3 is a side view of the present embodiment corresponding to FIG.

FIG. 4 is a side view of the present embodiment corresponding to FIG.

FIG. 5 is a plan view of a portion of a work positioning and fixing device in the present embodiment.

6 is a front view of a portion of the work positioning and fixing device corresponding to FIG.

7 is a side view of a part of the work positioning and fixing device corresponding to FIG.

FIG. 8 is a front view showing an example of a clamp jig in the present embodiment.

9 is a plan view of a clamp jig corresponding to FIG. 8. FIG.

FIG. 10 is a conceptual diagram showing a drive mechanism of the shuttle conveyor in the present embodiment.

FIG. 11 is a plan view of a portion of a work receiving means of the shuttle conveyor in this embodiment.

12 is a side view of a portion of the work receiving means corresponding to FIG. 11. FIG.

13 is a sectional view taken along the line XIII-XIII in FIG.

FIG. 14 is a sectional view taken along the line XIV-XIV in FIG.

[Explanation of symbols]

Reference numerals 11 and 12 are overhead transfer machines, 13 is a shuttle conveyor, 14 is an overhead transfer machine, 15 is a rear frame assembly workbench, 16 is a work floor, 17 is a rear floor assembly workbench, 18 and 19 are frame holding beds, 20 , 21,
22 is a welding robot, 23 is a floor holding base, 24 is a welding robot, 25 is a rear frame positioning and fixing device, 26
Is a frame tack welding robot, 27 is a rear floor positioning and fixing device, 28 is a floor tack welding robot, 29
Is a pit, 30 is a mount, 31 is a bearing, 32 is a swivel axis, 3
3 is a table base, 34 is a positioning locator, 35 is a clamp jig, 36 is a fluid pressure cylinder, 37 is a clamp arm, 38 is a bracket, 39 is a link, 40 is a piston rod, 41 is a jig rotation motor, and 42 is Reducer, 43 a drive sprocket, 44 a driven sprocket, 45 a drive chain, 46 a knock cylinder, 47 a fitting cylinder,
48 is a swivel axis, 49 is a table base, 50 is a positioning locator, 51 is a clamp jig, 52 is a shuttle beam, 53 is a pillar, 54 is a guide roller, 55 is a beam holder, 56 is an ejector beam, 57 is a rack, 58 Is a pinion case, 59 is a pinion shaft, 60 is a drive pinion, 61 is a driven pinion, 62 is a lifting rod, 63 is a rack, 64 is a work receiving means, 65 is a locator pin, 6
6 is a cross member movable positioning locator, 67 is a locator pin, 68 is a side member movable positioning locator, 69 is a clamp jig, 70 is a positioning locator, 7
1 is a slider, 72 is a slider drive cylinder, 73 is a locator holder, 74 is a locator holder drive cylinder, 7
5 is a receiver, 76 is a clamp arm, 77 is a fluid pressure cylinder, 78 is a locator pin, 79 is a receiver, 80 is a bracket, 81 is a receiver driving cylinder, and 82 is a locator pin. Further, P ₀ is the carry-out position of the rear side member, P ₁
Is the frame mounting position, P ₂ is the frame temporary mounting position,
P ₃ and P ₄ are frame additional striking positions, P ₅ is a floor pan assembly position, P ₆ is a floor pan temporary mounting position, P ₇ is a rear floor additional striking position, W _HF is a positioning hole, W _HS is a positioning hole,
W _HC is a positioning hole, W _HR is a positioning hole, W _C is a cross member, W _FP is a rear floor pan, W _RF is a rear frame, W
_S is a rear side member.

Claims (1)

[Claims] 1. A swivel shaft whose both ends are rotatably supported via bearings, a pair of left and right table bases radially projecting from both end sides of the swivel shaft, and a work type. Correspondingly, work positioning and fixing means respectively mounted on the plurality of sets of table bases, turning axis indexing means connected to the turning axis for indexing and rotating the predetermined table base to a work exchange position, and the turning axis. A shuttle beam that extends in a direction intersecting with the shuttle beam and that can be located between the pair of left and right table bases at the workpiece exchange position; and a workpiece receiving means that is attached to the shuttle beam and that can hold the workpiece. The work is received between the work receiving means and the work positioning and fixing means of the pair of left and right table bases at the work exchange position. Transfer device for transporting the ark, and a shuttle beam drive means.