JPH04293661A - Work conveying method and work conveying device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece conveyance method and a workpiece conveyance apparatus, and more particularly to a workpiece conveyance method and a workpiece conveyance apparatus that use a cart to convey a workpiece while rotating it around a substantially horizontal center of rotation.

0002

[Prior Art] Generally, in the painting process of an automobile manufacturing factory, a plurality of carts that support the car body and a traveling drive that drives the carts are used as a transportation method to transport the car body between work stations such as a painting station and a drying station. A method of transporting using a vehicle body transporting device equipped with means is widely adopted. Incidentally, in recent years, in car body painting, particularly in top coat painting, it has been attempted to improve the quality of car body painting by applying the paint to a thickness greater than the sag limit. In this case, in order to control the sagging of the paint after painting, in the vehicle body conveying device, for example, Utility Model Application Publication No. 1983-126064 or Utility Model Application No. 1-3410 filed by the applicant of the present application is used.
As described in No. 0, a rotating support part that supports a vehicle body rotatably around a substantially horizontal center of rotation, the rotating support part being configured such that the center of gravity of the vehicle body and the rotating support part substantially coincides with the center of rotation. A support part is provided on the trolley, and a rotary drive means is provided to rotate the rotary support part in a predetermined rotational direction, and after painting the car body in an upright position at the painting station, A transportation method is used in which a cart is run while rotating the vehicle body.

0003

[Problem to be Solved by the Invention] In the transportation method using the vehicle body transportation device described in the above-mentioned publication, the center of gravity of the vehicle body and the rotation support section is configured to substantially coincide with the center of rotation, so that the rotation When the drive is stopped, the car body does not always stop in the upright position, and in order to carry out the car body in the upright position for the next process, a rotational drive means is required to return the car body to the upright position. , a large and complex device equipped with a detection means for detecting the upright position while the vehicle body is rotating, a positioning means for positioning the vehicle body in the upright position, and a rotation restraint means for rotationally restraining the vehicle body in the upright position, etc. must be separately provided in the vehicle body transport device, which poses problems in that the manufacturing cost of the vehicle body transport device increases significantly and the work efficiency is significantly reduced. Furthermore, since the vehicle body is positioned by detecting the upright position while the vehicle body is rotating and rapidly stopping the rotational support section by the positioning means, a large load acts on the rotational drive means, the positioning means, and the rotational support section. There is a problem that the durability of the material decreases.

An object of the present invention is to provide a workpiece conveyance method and workpiece conveyance method that can easily position a workpiece in an upright position and fix it in a rotationally restrained manner, reduce the manufacturing cost of a workpiece conveyance device, and improve work efficiency. The purpose is to provide equipment.

[0005]

[Means for Solving the Problems] A workpiece conveying method according to claim 1 includes rotatably supporting a workpiece on a cart via its rotation support part, and moving the cart while rotating the workpiece around a substantially horizontal rotation center. In a method of transporting a traveling workpiece, the workpiece is supported on the rotating support part so that the center of gravity of the workpiece and the rotating support part when in an upright position is eccentrically downward in the vertical direction with respect to the center of rotation, and the rotation of the workpiece is stopped. When doing so, stop the rotational drive to the rotating support and switch the workpiece to free rotation, then position the workpiece in an upright position, and then,
The workpiece is fixed to the cart in a rotationally restrained manner.

[0006] In the workpiece conveyance device according to the second aspect of the present invention, a rotational support section for rotatably supporting the workpiece around a substantially horizontal center of rotation is provided on the trolley, and a rotational drive means for rotationally driving the rotational supporter and a traveling drive means for driving the trolley. In the workpiece transport device, the workpiece conveyance device is configured to include a traveling drive means to move the cart while rotating the workpiece via the rotational support part, and the rotational support part is configured to move when the workpiece and the rotational support part are in the upright position. The center of gravity of the cart is eccentrically downward in the vertical direction with respect to the center of rotation, and the rotational drive of the rotational drive means is stopped at a predetermined stop position at which the cart is to stop or near the upstream thereof, and the cart is allowed to rotate freely. A switching means is provided for switching the workpiece, a positioning means is provided for positioning the workpiece that has stopped rotating at the stop position to an upright position, and a rotational restraint means is provided for rotationally restraining the workpiece positioned by the positioning means to a cart via a rotational support part. It was established.

[0007]

In the method for transporting a workpiece according to the first aspect, when the rotation of the workpiece is stopped, the rotational drive of the rotary support section is stopped and the workpiece is switched to free rotation. At this time,
Since the workpiece is supported by the rotational support section in such a way that the center of gravity of the workpiece and the rotational support section when in the upright position is eccentrically downward in the vertical direction with respect to the center of rotation, the workpiece that is switched to free rotation is approximately Rotation converges to the upright position. Next, the workpiece located in the substantially erect position is positioned in the erect position, and then the workpiece is fixed to the cart in a rotationally restrained manner. In this way, when the workpiece is in the upright position, the workpiece is supported on the rotational supporter so that the center of gravity of the workpiece and the rotational supporter is eccentric downward in the vertical direction with respect to the center of rotation, and when the workpiece is switched to free rotation, the workpiece Since the rotation is automatically converged to a substantially upright position, the workpiece can be easily positioned in the upright position, and the workpiece can be fixed to the cart in a rotationally restrained manner. Therefore, it is possible to omit the step of rotating the workpiece to return it to the upright position or detecting the upright position while the workpiece is rotating, and the work efficiency can be greatly improved.

In the workpiece conveying device according to the second aspect, when the rotation of the workpiece is stopped, the rotational drive of the rotational drive means is stopped by the switching means at a predetermined stop position where the cart is to be stopped or in the vicinity of the upstream thereof, and the rotation of the workpiece is stopped. Switch to free rotation. At this time, since the center of gravity of the workpiece and the rotation support part in the upright position is eccentrically downward in the vertical direction with respect to the center of rotation, the workpiece switched to free rotation is in the approximately upright position. The rotation converges to . Next, the workpiece whose rotation has been stopped at a predetermined stop position is positioned in an upright position by the positioning means, and then the positioned workpiece is rotationally restrained by the rotational support section on the cart via the rotational support section. In this way, the rotating support part is configured such that when the workpiece and the rotating support part are in the upright position, their centers of gravity are eccentrically downward in the vertical direction with respect to the center of rotation, and when the workpiece is switched to free rotation, the rotational support part automatically Since the rotation converges to the approximately upright position, it is possible to omit means for returning the workpiece to the upright position and detection means for detecting the upright position while the workpiece is rotating, and the workpiece conveyance device It is possible to significantly reduce manufacturing costs and improve work efficiency. Furthermore, since the workpiece that has stopped rotating is positioned in an approximately upright position, a large load is not applied to the positioning means or the rotational support when positioning the workpiece in the upright position. can be constructed easily and compactly, and their durability can be increased.

[0009]

According to the workpiece conveying method according to claim 1, as explained in the section of the above-mentioned operation, the center of gravity of the workpiece and the rotating support part in the upright position is perpendicular to the center of rotation. The workpiece is supported by the rotating support part so as to be eccentric downward, and when the workpiece is switched to free rotation, the rotation is automatically converged to a substantially upright position, so that the workpiece can be easily positioned in the upright position. It is possible to omit the steps of rotating the workpiece to return it to the upright position and detecting the upright position while the workpiece is rotating, resulting in significant improvements in work efficiency. .

According to the workpiece conveyance device according to claim 2,
As explained in the section above, the rotary support section is configured so that when the workpiece and the rotary support section are in the upright position, their centers of gravity are eccentric downward in the vertical direction with respect to the center of rotation, and the workpiece is With a simple configuration that includes a switching means for switching to free rotation, it is possible to omit means for returning the workpiece to the upright position and detection means for detecting the upright position of the workpiece, making it possible to manufacture a workpiece conveyance device. It is possible to significantly reduce costs and improve work efficiency, and since the workpiece that has stopped rotating is automatically positioned in an approximately upright position, when positioning the workpiece in the upright position, there is no need for positioning means or rotation support. A large load is not applied to the part, and the positioning means and rotation support part can be easily and compactly configured.
Further, effects such as being able to enhance their durability can be obtained.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is used in the top coating process of a car body painting line in an automobile manufacturing factory.This example describes a car body transport system in which a car body supported by a cart is rotated in a predetermined rotation direction around a substantially horizontal rotation center in the longitudinal direction of the car body while the cart runs. The present invention is applied to a method and a vehicle body transport device. Note that the front, rear, left, and right will be defined and explained based on the front, rear, left, and right of the vehicle body.

First, the top coating step UP will be briefly explained. As shown in FIG. 1, the top coating process UP is provided with a carry-in station ST1, a top coat station ST2, an unlocking station ST3, a drying station ST4, and a carry-out station ST5 from the upstream side. A vehicle body transport device HS is provided which includes a plurality of trolleys 10 (see FIG. 2) for transporting the vehicle body between stations ST1 to ST5. Note that each truck 10 is circulated through each station ST1 to ST5. Loading station ST1 is equipped with four sets of vehicle body fixing devices.
The vehicle body B, which has been coated with an intermediate coating in an intermediate coating step (not shown), is transported to a carry-in station ST1 by a hanger, and is fixed to a bogie 10 in an upright position (see FIG. 2) by a vehicle body fixing device. Next, the car body B is conveyed to the topcoating station ST2, and the car body B is conveyed to the downstream side, for example, by about 60 μm.
is coated with a top coat to a thickness of , and then transported to the unlocking station ST3. Unlock station ST
3 is provided with a lock release device, and the vehicle body B is released from a state fixed in an upright position by the lock release device to a state in which it can rotate around a rotation center Cr (see Fig. 2) in the longitudinal direction of the vehicle body. It is transported to the drying station ST4 in this state. A guide member 64 constituting a rotation mechanism 60 is provided near the upstream side of the drying station ST4, and an endless chain 58 constituting the rotation drive mechanism 50 is provided downstream of the drying station ST4.
Then, the vehicle body B is rotated by a rotation mechanism 60 around the rotation center Cr clockwise by a predetermined angle when viewed from the rear side, and then continuously rotated clockwise around the rotation center Cr by the rotation drive mechanism 50. During this time, the coating film is dried and baked. Next, the vehicle body B is switched to free rotation and transported to the unloading station ST5. The unloading station ST5 is provided with four sets of car body fixing release devices 80, and the car body fixing release devices 80 position the car body B in an upright position and release the fixation to the trolley 10. Thereafter, the car body B is moved to the next place by a hanger. It is transported to the process of
0 is transferred to the carry-in station ST1 side. In addition, in the following explanation, the vehicle body transport device HS
Of these, the trolley 10, rotation drive mechanism 50, rotation mechanism 60, and vehicle body lock release device 80 will be described, and descriptions of the vehicle body lock device and the lock release device will be omitted.

Next, the trolley 10 will be explained. Figure 2~
As shown in Figure 4, each station ST in the top coating process UP
Carts 10 are provided in the following manner on the transfer line L provided in the front-rear direction on the floor F from ST1 to ST5. The trolley 10 includes a base portion 11 extending in the front-rear direction,
Column parts 1 erected at the rear end and front end of the base part 11, respectively
2 and 13, and the column parts 12 and 13, respectively, are installed on the vehicle body B.
Rotating support part 2 that supports rotatably around the rotation center Cr.
0.0.20A, etc., and the trolley 10 is movably disposed along the rail 1 laid in the forward and backward direction on the transfer line L via support wheels 14 and 15 attached to the base part 11, and is It is adapted to be moved and driven by a chain type drive mechanism (not shown) provided on the line L. Note that reference numeral 16 is an auxiliary rolling wheel provided on the base portion 11, and reference numeral 17 is a support wheel that rolls on a rail when the trolley 10 is returned from the carry-out station ST5 to the carry-in station ST1.

Next, the rotation support part 20 provided on the column part 12 on the rear side of the truck 10 and the rotation support part 20A provided on the column part 13 on the front side will be explained. Since the front and rear rotation support parts 20 and 20A have substantially the same configuration, the rear rotation support part 20 will be explained first, and the front rotation support part 20 will be explained first.
Regarding A, the same reference numerals are given to the same members as those of the rotation support part 20, detailed explanation is omitted, and different points will be explained. As shown in FIGS. 2 to 4, a gearbox 21 provided at the upper part of the column part 12 has a shaft member 23 that is freely rotatable in the front-rear direction and aligned with the rotation center Cr via front and rear bearings 22. A pivot member 24 is provided at a front end portion of the shaft member 23 protruding from the gear box 21, and has an arm portion 24a projecting forward below the rotation center Cr and an extension portion 24b extending downward. A support member 25 extending a predetermined length from side to side is fixed to the front end of the arm portion 24a. At the left and right ends of the upper end of the support member 25, engagement holes 25a that are circular in plan view are respectively provided, and toggle type clamps 30 are provided at the left and right ends of the front end of the support member 25, respectively, oriented in the left-right direction. It is being

As shown in FIGS. 2 and 5, an engagement hole 24c is formed in the lower end of the extension part 24b of the pivot member 24 in the front-rear direction, and the rotation support part 20 is in the upright position (the pivot member 24 When the extension part 24b is in the vertically downward position), the part of the column part 12 facing the engagement hole 24c is provided with a toggle type for restraining the rotation of the rotation support part 20 about the rotation center Cr. A clamp tool 30 is provided in the front-rear direction. On the other hand, the pivot member 24A of the front rotation support part 20A is formed with an arm part 24a projecting rearward below the rotation center Cr, but an extension part 24b is not formed. A support member 25A extending a predetermined length from side to side is fixed to the rear end of the arm portion 24a of the pivot member 24A.
Engagement holes 25b that are long in the front-rear direction are formed at the left and right ends of the upper end of the support member 25A, respectively, and clamp tools 30 are provided in the left and right ends of the front end of the support member 25A, respectively. Note that the shaft member 23A is provided to coincide with the rotation center Cr. In this way, the rotation support part 20
20A, as shown in FIG. 2, when the vehicle body B is supported in the upright position by the rotational supports 20 and 20A in the upright position, the center of gravity Cw of the vehicle body B and the rotational supports 20 and 20A is is eccentric downward in the vertical direction with respect to the rotation center Cr.

The holding frame 40 attached to the front end and rear end of the vehicle body B will now be described. However, since the front and rear holding frames 40 have the same configuration, the holding frame 40 attached to the rear end will be described. As shown in FIGS. 2 and 4, the holding frame 40 includes a pair of left and right fixing members 41 fixed downward to the rear end of the vehicle body B, and left and right fixing members having approximately the same length as the support member 25. A connecting member 42 is fixedly attached to the connecting member 41 and provided in the left-right direction, an engaging pin 43 is fixedly attached to the lower end of each fixing member 41, and a connecting member 43 is fixedly fixed downwardly to the left end and the right end of the rear end of the connecting member 42, respectively. The engagement member 44 has an engagement hole 44a formed at its lower end, and the distance between the left and right engagement pins 43 is equal to the distance between the left and right engagement holes 25a of the support member 25.

Next, the rotational drive mechanism 50 will be explained. As shown in FIGS. 2 and 4, a shaft member 51 is provided at the rear end of the base portion 11 of the truck 10 so as to be rotatable in the left-right direction, and a sprocket 52 is attached to the right end of the shaft member 51. There is. A shaft member 53 is provided on the column portion 12 of the truck 10 so as to be freely rotatable in the vertical direction, a bevel gear 54 is attached to the lower end of the shaft member 53, and a bevel gear 55 attached to the shaft member 51 is attached to the bevel gear 54. A bevel gear 56 is mounted on the upper end of the shaft member 53, and the bevel gear 56 meshes with a bevel gear 57 mounted on the shaft member 23. On the other hand, on the right side of the transfer line L corresponding to the drying station ST4, excluding the vicinity upstream of the drying station ST4, an endless chain 58 is provided in the front-rear direction.
8 is rotationally driven in a direction opposite to the transport direction of the vehicle body B by a drive device (not shown). Incidentally, reference numeral 59 is a guide ring provided on the endless chain 58.

The vehicle body B, which has been carried in an upright position to a predetermined position of the carry-in station ST1 by the hanger, is transferred to the trolley 10 that is stopped at the carry-in station ST1. At this time, the front and rear rotational supports 20 and 20A are in the upright position, and the vehicle body B connects the engagement pins 43 of the front and rear holding frames 40 to the corresponding engagement holes of the front and rear rotational supports 20 and 20A, respectively.
5a and 25b, it is positioned on the trolley 10. After that, the column part 1 is fixed by the vehicle body fixing device.
2 clamp tool 30 and front and rear rotation support parts 20 and 20A
The operating lever 31 of the clamping tool 30 is rotated, and as shown in FIG. The lock position protruding from the sleeve 33 from
(solid line shown), and the engagement hole 24c of the extension portion 24b
By engaging the engagement pin 32 with the rotation support part 20
is locked in the upright position, and similarly the front and rear rotational supports 20
- The engagement pins 32 of the 20A clamp tool 30 are switched from the non-locking position to the locking position, and each engagement pin 32 engages with the engagement hole 44a of the corresponding connecting member 44, so that the rotation support part 20- Even when 20A is rotated,
The vehicle body B is fixed to the truck 10 so as not to fall off. After the vehicle body B is fixed to the bogie 10 in this way, the bogie 10
is moved downstream and a top coat is applied to the vehicle body B in the upright position at the top coat station ST2.Next, at the lock release station ST3, the engagement pin 32 of the clamp tool 30 of the column part 12 is unlocked by the lock release device. It is switched to the lock position, and the vehicle body becomes rotatable around the rotation center Cr.

Next, the rotation mechanism 60 will be explained. As shown in FIGS. 2 and 4, the rotation mechanism 60 includes a base portion 11
A lever member 61 attached to the left end of the shaft member 51 protruding from the rear end, and front and rear support members 62 and 63 fixed vertically to the left end of the transfer line L near the upstream of the drying station ST4. , a guide member 64 having an L-shaped cross section and a predetermined length, and the guide member 64 is comprised of a support member 6
The upper wall portion 64a of the upper wall portion 64a is fixed to the inner surface of the upper portion of the rotary support portion 2.63 so as to be inclined forwardly downward so as to be able to come into contact with the lever member 61. It is attached to the shaft member 51 so that still,
The rear end of the endless chain 58 and the guide member 6 of the rotation mechanism 60
The distance from the front end of No. 4 is set to a predetermined distance.

As mentioned above, the unlocking station S
At T3, the vehicle body B becomes rotatable around the rotation center Cr by the lock release device and moves to the drying station S.
When the lever member 61 is conveyed to the vicinity of the upstream side of T4, the lever member 61 comes into contact with the upper wall portion 64a of the guide member 64, and during this time, the lever member 61 is rotationally driven in the clockwise direction, the shaft member 51 is rotated, and this rotational force is It is transmitted to the shaft member 23 via the bevel gears 54 and 55, the shaft member 53, and the bevel gears 56 and 57, and the shaft member 2
3 is rotationally driven, and as shown by the arrow in FIG.
is rotated clockwise by a predetermined angle (for example, about 45°). Thereafter, when the lever member 61 passes the guide member 64, the vehicle body B is conveyed downstream while rotating inertia in the counterclockwise direction due to its own weight, as shown by the arrow in FIG. 7, and as shown in FIG. During inertia rotation in the clockwise direction, the sprocket 52 engages with the endless chain 58, and the sprocket 5
2 is rotationally driven, the shaft member 51 rotates, and this rotational force is transmitted to the shaft member 23 in the same manner as described above, the shaft member 23 is rotationally driven, and the vehicle body B is rotated continuously in the clockwise direction by the rotation support portions 20 and 20A. rotate.

Next, four sets of vehicle body fixation release devices 80 will be explained. As shown in FIG. 9, four sets of vehicle body fixing release devices 80 are provided, two sets each facing the front end and rear end of the vehicle body B transported to a predetermined stopping position of the unloading station ST5. It is arranged in a shape. Incidentally, since each vehicle body fixation release device 80 has a similar configuration, of the two sets of vehicle body fixation release devices 80 corresponding to the front end of the vehicle body B, the vehicle body fixation release device 80 disposed on the right side of the transfer line L
I will explain about it. As shown in FIGS. 9 to 11, a base frame 81 is provided on the floor F, and a pair of front and rear guide members 82 are provided at the upper end of the base frame 81 in the left-right direction. A movable stand 83 is provided so as to be movable in the left and right direction. Further, an air cylinder 84 is provided on the base frame 81 in the left-right direction, and a bracket 85 fixed to the tip of the rod 84a of the air cylinder 84 is connected to the lower end of the movable base 83. As shown in FIG. By driving 84, the movable base 83 is moved to a retracted position (shown by a two-dot chain line) and an advanced position (shown by a solid line). Furthermore, the reference numeral 86 indicates a movable base 83.
It is a proximity switch for detecting the position of.

The movable base 83 has a pair of front and rear pivot plate members 87.
are erected, and a support shaft 88 is provided on the upper part of the front and rear pivot plate members 87.
A block member 89 is rotatably provided via the front and rear pivot plate members 87, and an air cylinder 90 is supported by a trunnion and is provided diagonally upward at the lower part of the front and rear pivot plate members 87.
The base end of the link 91 is rotatably attached to the rod 90a, and the two link plates 91 on the lower side of the link 91
a is rotatably attached to the front and rear pivot plate members 87 via a support shaft 92, and one link plate 91b on the upper side of the link 91 is rotatable to the middle part of the block member 89 via a support shaft 93. As shown in FIG. 10, by driving the air cylinder 90, the block member 89 is rotated upward via the link 91 to the operating position (shown by the solid line) and downward to the non-operating position. The position can be changed to (shown by a two-dot chain line). Support shaft 8 at the upper end of the block member 89
A shock damper 97 is provided vertically at the center of the upper end of the block member 89, and a guide portion 89b is provided at the front end of the block member 89 in a projecting shape. The guide portion 89b is formed to be oriented in the left-right direction, and a slide member 94 is provided on the guide portion 89b so as to be movable in the left-right direction. An operating portion 94a and a connecting portion 94b are formed at the upper and lower ends of the slide member 94, respectively, and an air cylinder 96 is provided in the left-right direction on the front side of the block member 89 via a bracket 95 fixed to the lower end of the block member 89. The rod 96a of the air cylinder 96 is connected to the connecting portion 94b of the slide member 94, and as shown in FIG. 10, by driving the air cylinder 96, the slide member 94 is moved to the retracted position ( The position can be switched between a forward position (shown by a solid line) and an advanced position (shown by a two-dot chain line) in which it advances toward the transfer line L side along the guide portion 89b. Incidentally, reference numeral 98 is a proximity switch for detecting the position of the slide member 94.

Next, a method of transporting a vehicle body using the vehicle body transporting device HS will be explained. As described above, at the drying station ST4, the paint on the car body B is dried while being rotationally driven, and when the truck 10 moves to the downstream end of the drying station ST4, the engagement between the sprocket 52 and the endless chain 58 is released and the car body The rotational drive of body B is stopped, and the vehicle body B is switched to free rotation. Since the vehicle body B is supported by the rotational supports 20 and 20A so that the center of gravity Cw of the vehicle body B in the upright position and the rotational supports 20 and 20A is eccentric downward in the vertical direction with respect to the rotation center Cr, Trolley 1
0 is transported to the stop position of the unloading station ST5, the car body B, which has been switched to free rotation, converges in rotation to a substantially upright position, and when the trolley 10 stops at the stop position, the rotation support parts 20 and 20A and the car body B is in a state where it is slightly moving around the upright position. When the trolley 10 stops at the stop position, the movable base 83 of each vehicle body fixing release device 80 is switched from the retracted position to the advanced position. Next, when the block member 89 is switched from the non-operating position to the operating position, each shock damper 97 comes into contact with the lower ends of the support members 25 and 25A of the rotation support parts 20 and 20A, and the rotation support parts 20 and
The after-movement of 20A is stopped and the vehicle body B is positioned in an upright position. In this state, the contact portion 89a of the block member 89 contacts the lower end of the support members 25, 25A, and the rotation support portion 20
- 20A and the vehicle body B are fixed to the trolley 10 in a rotationally restrained manner. Next, when the slide member 94 is switched from the retracted position to the advanced position, the operation lever 31 of the clamp tool 30 provided on the support members 25 and 25A is rotationally driven by the operation section 94a, and the engagement pin of the clamp tool 30 is rotated. 32 is switched from the locked position to the unlocked position, the engagement between the engagement pin 32 and the engagement hole 44a is released, and then the vehicle body B is transported to the next process using a hanger.

[0024] In this way, the rotation support parts 20 and 20A are
When the vehicle body B and the rotational supports 20 and 20A are in the upright position, their centers of gravity Cw are vertically eccentric downwards with respect to the rotation center Cr, and when the vehicle body B is switched to free rotation, Since the rotation converges to the approximately upright position, it is possible to omit a mechanism for returning the vehicle body B to the upright position and a detection mechanism for detecting the upright position while the vehicle body B is rotating.
It is possible to significantly reduce the manufacturing cost of the vehicle body transfer device HS and improve work efficiency. Furthermore, since the vehicle body B that has been rotationally converged to a substantially upright position is positioned, a large load is not applied to the vehicle body fixation release device 80 or the rotational supports 20 and 20A when positioning the vehicle body B to the upright position. ,
The vehicle body fixing release device 80 and the rotation support parts 20 and 20A can be easily and compactly configured, and their durability can be increased. Note that it is also possible to configure the trolley 10 to be self-propelled. Further, an extension portion 24b is formed on the pivot member 24A of the rotation support portion 20A, and the column portion 1
3 is provided with a clamping tool 30 corresponding to the extension portion 24b,
At the loading station ST1, when transferring the vehicle body B to the trolley 10, the rotation support part 2 is
0.20A may be locked so that it cannot rotate.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the top coating process.

FIG. 2 is a partially cutaway side view of the truck.

FIG. 3 is a plan view of the truck.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2;

FIG. 5 is a side view of the clamp tool.

FIG. 6 is an explanatory diagram showing the rotation of the vehicle body by the rotation mechanism.

FIG. 7 is an explanatory diagram showing inertial rotation of the vehicle body in a predetermined direction.

FIG. 8 is an explanatory diagram showing starting rotation of the vehicle body in a predetermined direction.

FIG. 9 is a front view of the vehicle body fixation release device.

FIG. 10 is an enlarged front view of the vehicle body fixation release device.

FIG. 11 is a side view of the vehicle body fixation release device.

[Explanation of symbols]

B Vehicle body Cr Center of rotation Cw Center of gravity HS Vehicle body transfer device 10 Trolley 20/20A Rotating support part 50 Rotation drive mechanism 60 Rotating mechanism 80 Vehicle body fixing release device

Claims (2)

[Claims] Claim 1: A workpiece transport method in which a workpiece is rotatably supported by a dolly via its rotation support part, and the dolly travels while rotating the workpiece around a substantially horizontal center of rotation, the workpiece being in an upright position. The work is supported by the rotation support so that the center of gravity of the rotation support is eccentric downward in the vertical direction with respect to the center of rotation, and when stopping the rotation of the work, the rotational drive to the rotation support is stopped and the work is Switch to free rotation, then position the workpiece to an upright position,
Next, a workpiece conveyance method is characterized in that the workpiece is fixed to a cart in a rotationally restrained manner. 2. The cart is provided with a rotation support part that supports the workpiece rotatably around a substantially horizontal center of rotation, and a rotation drive means for rotationally driving the rotation support part and a traveling drive means for driving the cart to rotate. In a workpiece conveying device configured to run a cart while rotating the workpiece via a support part, the rotation support part is configured such that when the workpiece and the rotation support part are in an upright position, their centers of gravity are aligned with the center of rotation. A switching means is provided for stopping the rotational drive of the rotational drive means and switching to free rotation at a predetermined stop position at which the bogie is to stop or in the vicinity of the upstream thereof; A workpiece characterized in that a positioning means is provided for positioning a workpiece whose rotation has stopped at a position to an upright position, and a rotational restraint means is provided for rotationally restraining the workpiece positioned by the positioning means to a cart via a rotational support part. Conveyance device.