JP2003089021A - Holder switching device for body conveying carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switchable holder having a simple structure and no actuator. SOLUTION: A locator holder 46 having a locate pin 6 with a clamp function at its tip is provided on a slide base 49 and switched to a switch position PA or PB according to the model of a vehicle for positioning. Through the spiral advancing action of an operating screw 59 of a lock mechanism 53 provided to the slide base 49, a driven block 57 is locked by being pressed against and engaged with a reference block 61 or 62 of a carrier body 41. In shifting, a fork 74 of an external drive unit 64 is engaged with a pin 52 of the slide base 49, the operating screw 59 is loosened by a nut runner 76, and a shift table 67 and the locator holder 46 are shifted to the switch position by a shift cylinder 68.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig switching device for a vehicle body carriage used in an automobile body assembly line, and more particularly to a general-purpose vehicle body suitable for conveying a plurality of vehicle bodies in a so-called mixed flow mode. The present invention relates to a jig switching device in a carrier truck.

[0002]

2. Description of the Related Art For example, Japanese Patent No. 27458 has been proposed as a general-purpose vehicle body transportation facility which can be adapted to a mixed flow production mode of automobile bodies.
There is one described in Japanese Patent No. 41.

In this conventional structure, there is provided a carriage for connecting the final stage and the first stage of the vehicle body assembly line in which work stages are set at predetermined intervals with a return line to position and support the vehicle body for transportation. In order to circulate and use, a plurality of multi-axis units having three degrees of freedom of movement of three orthogonal axes are arranged as a locator jig on the carriage.
A locating pin having a clamping function is provided at the tip of each multi-axis unit so that the three-dimensional position of each locating pin can be switched to an arbitrary position, while the switching stage set in the circulation line is used. Is equipped with a switching robot, and when transporting a vehicle body of a different vehicle type by a transport carriage, the fastening force (constraining force) of the brake unit, etc. that restrains the freedom of movement of each multi-axis unit at the switching stage. Then, the switching robot on the switching stage grasps the locate pin of each multi-axis unit to move it to an arbitrary position for positioning, and again restricts the degree of freedom of movement of each multi-axis unit. The position of each locate pin is switched.

[0004]

In the conventional structure as described above, when compressed air is externally supplied to release the fastening force (restraining force) of the brake unit or the like when switching the position of the locate pin, the orthogonal three axes are simultaneously released. Each built-in air cylinder for returning to the home position operates for each degree of freedom of
Since the locating pin is designed to return to the origin position in each direction, it is necessary to attach an air cylinder for returning to the origin position separately from the brake unit for each degree of freedom of operation. This is not preferable because the entire device becomes large and complicated.

Further, as described above, there is an advantage that it is not necessary to attach an actuator for each degree of freedom of movement of the multi-axis unit, but on the other hand, fastening of a brake unit or the like which restrains the degree of freedom of movement of each multi-axis unit. Since it is necessary to supply compressed air from the outside in order to release the force or release the clamped state which is the additional function of the locate pin, it is necessary to install an auto joint (coupler) and piping work on the truck itself, As a result, the carriage itself becomes complicated and the equipment cost is inevitably soared.

The present invention has been made in view of the above problems, and on the premise that the position of the locator jig is switched by an external drive system without attaching an actuator to the carrier side. It is intended to provide a structure of a jig switching device capable of contributing to a reduction in the total equipment cost while greatly simplifying the structure.

[0007]

According to a first aspect of the present invention, a vehicle body panel is transported by moving a transporting carriage, which positions and supports the vehicle body panel via a locator jig, along a predetermined transport path. On the other hand, it is premised on a jig switching device for a vehicle body carriage, which is configured to return the carriage body which has finished carrying the vehicle body panel to the starting end portion of the carriage path for reuse.

In addition, a locating pin is provided on the trolley body of the transport trolley so as to be slidable, and a locating pin for positioning the vehicle body panel is provided at the tip, and the position of the locating pin depends on the type of the vehicle body panel to be positioned. A locator jig that can be selectively switched and that is mechanically coupled to an external shift means and that can be switched to a predetermined switching position by the operation of the external shift means; and a lock and unlock provided on the locator jig. It has an operating screw for lock operation, and the locator jig can be mechanically moved to any switching position with reference to the reference member on the trolley body side by operating the operating screw in the forward and reverse directions by the external lock operating means. Locking means for positioning and locking.

The switching of the position of the locator jig is basically a two-position selection type, but may be a three-position selection type if necessary. Further, it is desirable to use, for example, a trapezoidal screw type operation screw for the locking means in view of its operational stability.

In this case, it is desirable that the position of the locate pin can be selectively switched in the horizontal plane as described in claim 2.

Similarly, as described in claim 3, both the external shift means and the external lock operation means are provided on the jig switching stage set at any position of the transport path of the transport carriage. It is preferable that the jig switching work is integrated and efficient.

Therefore, in the inventions according to claims 1 to 3, when the vehicle type information of the vehicle body panel to be mounted next on the carrier is given to the external lock operating means and the external shift means, the external lock operating means is first operated. When operated, the operating screw attached to the locking means is rotated to unlock the locked state of the locator jig and bring it to the unlocked state. As a result, the locator jig becomes slidable on the dolly for the first time when external force is applied. Following this, the external shift means mechanically couples with a part of the locator jig, and then shifts the locator jig to switch the position of the locator jig to a predetermined switching position different from the previous position. . Then, the external lock operating means is actuated again to bring the lock means into the locked state, thereby completing the switching of the position of the locator jig and the positioning lock operation.

By locking the locator jig capable of selectively switching the position in this manner, purely mechanically,
It is not necessary to attach an actuator to the trolley body side at all, and joints and piping are not necessary at all. In addition, the locked state is self-held by the tightening force of the operating screw, and its positional accuracy is guaranteed.

According to the invention described in claim 4, on the premise of any one of claims 1 to 3, while a V-block-shaped or mountain-shaped reference block is fixed as a reference member to the trolley body, The locking means on the locator jig side is
It is characterized in that it is provided with a follower block of a mountain shape or a V block shape which moves forward and backward according to the screwing action of the operation screw and engages and disengages with the reference block.

That is, when the reference member on the body side of the carriage is a V block-shaped reference block, the driven block on the locking means side, which is the other side, has a mountain shape, and the relative positional relationship between the two. It goes without saying that even if the opposite is true, it is mechanically valid.

Therefore, in the invention described in claim 4, the locking means for purely mechanically locking and the reference member on the side of the carriage main body are of V-block shape and mountain-shape to be engaged with each other. By combining with things,
The final position accuracy can be guaranteed while correcting the relative position error between the two in a transient state.

[0017]

According to the first and second aspects of the present invention, the selection switching operation of the position switching type locator jig is performed by the external shift means, and the locator jig is mechanically moved to the selection switching position. Since the locking / unlocking operation of the locking means for locking is also performed by the external locking operation means, it is not necessary to attach an actuator to at least the transport carriage side at all, and a joint or a conventional No piping work is required, and the structure can be simplified and the equipment cost can be significantly reduced.

Further, since the final holding force of the mechanical locking means is obtained by the tightening force of the operating screw, the holding force is high, and the position of the locator jig is, for example, due to the acceleration / deceleration of the transport carriage during transport. Prevent the gap,
There is an advantage that stable position accuracy can be maintained.

According to the invention described in claim 3, since both the external shift means and the external lock operating means are provided on a specific jig switching stage, the same effect as the invention according to claim 1 or 2 can be obtained. In addition, it is more preferable in terms of centralizing jig switching work and improving efficiency.

According to the fourth aspect of the invention, the locking means for purely mechanically locking and the reference member on the trolley body side are provided.
The combination of the V-block type and the mountain-shaped type that are engaged with each other makes it possible to guarantee the final position accuracy while correcting the relative position error between the two in a transient state, and also to ensure the locked state. The positioning accuracy in step 1 will be further improved.

[0021]

FIG. 1 is a schematic plan view of a vehicle body assembly line in a mixed flow production mode to which a carrier truck having a jig switching function according to the present invention is applied.

As shown in the figure, this vehicle body assembly line includes at least a floor loading step S1, a floor main hitting step S2, a body side temporary assembling step S3, a body main temporary hitting step S4, a body main hitting step S5 and It is formed as a closed loop by the roof temporary hitting step S6 and the like. Then, the transport vehicle equipped with a predetermined vehicle body panel travels while being transported in the direction of the arrow in the figure by the transporting means (not shown), whereby the degree of completion as the vehicle body is gradually increased.

Here, the floor main hitting step S2 is
This is a process of spot welding more spots on a floor main as a vehicle body panel assembled by temporarily fixing the engine compartment to the front floor, rear floor, etc. in the previous process. Similarly, the body side temporary assembly process S3 is This is a step of temporarily assembling the left and right body sides while positioning the left and right body sides with respect to the floor main after completion of the above-mentioned additional hitting. In addition, the body main provisional hitting step S4 is a step of performing spot welding with the minimum necessary number of dots while performing the relative positioning between the floor main and the body side, and similarly, the body main hitting step S5.
Is a step of performing spot welding of a larger number of spots on the body main assembled with the floor main and the left and right body sides. In addition, roof temporary driving step S
Step 6 is a step of temporarily fixing the roof panel to the body main body.

When the carrier truck 40 is positioned in the floor loading step S1, the floor main carried by an overhead conveyor (not shown) is dropped onto the carrier truck 40 by the drop lifter and positioned and placed in that state. It is sent to the subsequent process side as it is.

An unloading step S11 is set in the preceding stage of the floor loading step S1 shown in FIG. 1, and a vehicle body (body main) which has been subjected to predetermined welding and assembly by going around the line in FIG. In step S11, after being lifted by a drop lifter or the like, it is conveyed to the next step by an overhead conveyor, and the carriage 40 is again in an empty state. Then, the carrier vehicle 40 in the empty loading state is directly returned to the floor loading step S1 and is circulated and reused.

Here, the carriage 40 is provided with a plurality of fixed position fixed type gauges and clamp devices for positioning and supporting the floor mains, which are vehicle body panels, as well as a locate pin type locator jig, as will be described later. . And
Since the assembly line itself presupposes a so-called mixed flow production form in which multiple vehicle models are assembled on a common line,
It is also necessary for the carrier truck to be able to support the positioning and support of multiple car body types. Therefore, although some gauges and clamp devices are commonly used for each car body body, the locator jig can be used for positioning. According to this, the position is of a position switching type which selectively switches the position. It is necessary to switch the position of the locator jig before the target vehicle body (floor main) is loaded. Therefore, in the present embodiment, the floor loading step S1 described above also functions as a jig switching stage. ing.

2 and 3 show the details of the carriage 40 positioned in the floor loading step S1 which also serves as the jig switching stage. Particularly, FIG. 2 is a side view of the main part and FIG. 3 is the main part. The plan views are respectively shown. The carrier vehicle 40 according to the present embodiment is, for example, the floor main W1 of the A vehicle type.
It is possible to support any positioning support of the floor main W2 of the B car type.

As shown in FIGS. 2 and 3, a floor main W, which is a vehicle body panel regardless of whether it is the A vehicle type or the B vehicle type, is provided on the trolley main body 41 which is the mother body of the carrier vehicle 40.
In order to stably position and support 1 or W2, a plurality of fixed position fixed type gauges 42 and 43 having predetermined panel receiving surfaces, a clamp device 44 having a swing type clamp arm as a main element, and a slide are provided. A switchable jig 45 that is a selection switchable type by an operation (shift operation) is provided. The switchable jig 45 has a locator jig 46 mainly composed of a locate pin with a clamp function and a gauge 47 having a predetermined panel receiving surface. The locator jig 46 and the gauge 47 are integrated with each other. As a matter of fact, it can be selectively switched between a switching position PA for the A vehicle type and a switching position PB for the B vehicle type.

The locator jig 46 has a locate pin 6 at its tip, and a clamp arm is built in the locate pin 6, so that the locate panel 6 and the mating locate hole can be fitted to each other to secure the vehicle body panel. While positioning, the peripheral edge of the locate hole is clamped by a clamp arm, which has a known structure as far as the structure of the locate pin 6 incorporating the clamp arm is concerned.

4 to 6 show the details of the switchable jig 45 (however, the locator jig 46 and the gauge 47 are not shown in FIGS. 5 and 6), and FIG. 4 is a plan view. Figure 5
4 is a front view of FIG. 4, and FIG. 6 is a right side view of FIG. As shown in FIGS. 4 to 6 in addition to FIGS. 2 and 3, the carriage 40 is mounted on the carriage main body 41 via the linear guide 48.
Slide base 4 that can slide in the same direction as
9 is arranged, and a locator jig 46 and a gauge 47 are erected on the slide base 49 so as to be adjacent to each other. Therefore, the locator jig 46 and the gauge 47 can be selectively shift-switched together with the slide base 49 to the switching position PA or PB based on the stroke S of FIG.

While the gauge 47 has a simple panel receiving surface 47a as shown in FIG. 3,
The locator jig 46 is provided with the locating pin 6 having the above-mentioned clamp function at the tip of the work receiving base 2 provided upright on the stand 50 (see FIG. 2).

A guide pin 52 is projectingly provided on the slide base 49 via a bracket 51, and the slide base 49 is attached to a carriage main body 41 at a central portion between the locator jig 46 and the gauge 47. A locking mechanism 53 is provided as a locking means for mechanically positioning locking. The lock mechanism 53 is provided on the slide base 4
A slide block 56 is mounted on an auxiliary base 54 fixed on the shaft 9 via a linear guide 55. The slide block 56 is slidable in a direction orthogonal to the sliding direction of the slide base 49. A trapezoidal driven block 57 is fixed to the tip of the slide block 56.

Further, the linear guide 5 is attached to the auxiliary base 54.
The support plate 58 is fixed so as to straddle the rail of No. 5. A trapezoidal screw type internal thread portion is formed in advance on the support plate 58, and a trapezoidal screw type operation screw 59 is also provided so as to be screwed into the internal thread portion. The tip end of the operating screw 59 is rotatably connected to the slide block 56 via the adapter 60. Therefore, if the operating screw 59 is rotated (forward / reverse), the slide block 56 is moved in accordance with the screwing action. Moves forward and backward together with the driven block 57 at the tip.

On the other hand, on the trolley body 41 side, a pair of left and right reference blocks 61 and 62 are used as reference members so as to be at the same height position as the driven block 57 on the lock mechanism 53 side.
Are adjacently arranged with the same span as the stroke S of FIG. These reference blocks 61 and 62 are fixed to a bracket 63 which is erected on the trolley body 41, and are formed in a substantially V-block shape so as to receive the trapezoidal driven block 57. Then, as shown in FIGS. 3 and 4, the driven block 57 is moved by the screwing action of the operating screw 59 so that either one of the reference blocks 6
1 or 62 is brought into engagement pressure contact with the shift switching type locator jig 46 and the gauge 47 together with the slide base 49 on the trolley body 41 at the selection switching position PA or P
It is designed to be mechanically positionally locked with respect to B.

7 and 8 show an external drive device 64 which is arranged so as to be close to the switchable jig 45 in the jig switching stage (floor loading step S1 in FIG. 1) on which the carriage 40 is positioned. The external drive device 64 includes external shift means and external lock operation means, which will be described later. It should be noted that the external drive device 64 is configured such that, in the non-driving state, the transport carriage 40 and the floor main W1 mounted therein are mounted.
Alternatively, they are arranged so as not to interfere with W2.

As shown in FIGS. 7 and 8, a shift table 67 is mounted on a stand 65 via a linear guide 66 so as to be slidable in the same direction as the carriage conveying direction. A direct-acting type shift cylinder 68 is arranged as an actuator on the stand 65 side, and its piston rod 6
Since 9 is connected to the shift table 67, the shift table 67 shifts in the carriage conveying direction under a predetermined stroke in response to the expansion and contraction of the shift cylinder 68.

Further, on the shift table 67, a cross table 71 which is slidable in a direction orthogonal to the shift direction via a linear guide 70 is arranged. And
A direct-acting type approach cylinder 72 is arranged as an actuator on the shift table 67 side, and its piston rod 73 is connected to the cross table 71. Is capable of advancing and retreating, that is, approaching, with respect to the lock mechanism 53 described above.

A fork 74 having a U-shaped engaging groove 74a at its tip is fixed on the cross table 71, and a nut runner 76 is mounted adjacent to the fork 74 via a bracket 75. The socket portion 78 of the nut runner 76 faces the operation screw 59 of the lock mechanism 53. The relative positional relationship between the engaging groove 74a at the tip of the fork 74 and the tip of the socket portion 78 in the nut runner 76 is the same as the relative positional relationship between the pin 52 and the head of the operating screw 59 shown in FIGS. It almost matches.

Therefore, if the cross table 71 is approached (moved forward) with respect to the lock mechanism 53 under the state of FIG. 3, the engagement groove 74a of the fork 74 engages with the pin 52, and Nut runner 7
The socket 78 of 6 is the operation screw 59 on the lock mechanism 53 side.
It is set to be pressed against or fitted to the head of.
That is, the shift table 67 and the cross table 71 include the shift cylinder 68, the approach cylinder 72, and the fork 74, and the external shift means 80 for shifting the locator jig 46 and the gauge 47.
While the nut runner 76 is formed,
An external lock operating means for locking and unlocking the lock mechanism 53 is formed.

The vehicle body carrier truck 40 constructed as described above.
According to the above, when receiving the floor main W1 or W2 of the A vehicle type or the B vehicle type in the floor loading step S1 shown in FIG. 1, the switchable jig 4 is placed at a position corresponding to the vehicle type.
Therefore, the switchable jig 45 is switched in the floor loading step S1 which also serves as a jig switching stage prior to loading the floor main W1 or W2. That is, as shown in FIG. 2, in order to receive and position and support the floor main W1 of the vehicle type A, the switchable jig 45 is set to the switching position PA, and the floor main W2 of the vehicle type B is input and received. It is necessary to switch the switching jig 45 to the switching position PB in order to position and support the switch.

First, at the time when the carriage 40 in the empty state is positioned from the previous process to the floor loading process S1 which also serves as a jig switching stage, it is based on past vehicle body production history information or an actual switching type curing process. By detecting the position of the tool 45 with a non-contact type sensor, the current switchable jig 45
Is specified.

The external drive device 64 is activated in response to the current position information of the switchable jig 45, and the switchable jig 45 is currently in the seating position PA or PB (switching position P in FIG. 3).
After shifting the shift table 67 to the shift position according to A), the cross table 71 is moved forward. Thereby, the fork 74 on the cross table 71 side
Engaging groove 74a engages with the pin 52 on the switchable jig 45 side, and both are mechanically coupled. At the same time, the socket portion 78 of the nut runner 76 is fitted or press-contacted with the operation screw 59 of the lock mechanism 53 of the switchable jig 45.

In this state, the position of the switchable jig 45 to be switched next (the floor main W to be positioned and supported next).
1 or W2) (the position corresponding to the vehicle type) matches the current position, the external drive device 64 does not start at all,
In that state, a predetermined floor main, for example, the floor main W1 of the A car type, is received on the switchable jig 45.

At this time, since the clamp arm built in the locate pin 6 of the locator jig 46 is in the unclamped state in advance, the locate pin 6 and the other side locate hole are seated and fitted smoothly. The floor main W1 is positioned and clamped. When the floor main W1 is positioned and clamped by the locate pin 6, the cross table 71 of the external drive device 64 moves backward, and the carriage 40 is sent out to the next process.

On the other hand, the switchable jig 45 to be switched next
Is different from the current position (the position according to the vehicle type of the floor main to be positioned and supported next), for example, the current position of the switchable jig 45 is the switching position PA for the vehicle type A.
When the position to be switched next is the switching position PB for the B vehicle type, the mechanical coupling between the external drive device 64 and the switchable jig 45 has already been completed as described above. Therefore, first, the nut runner 76 fitted or press-contacted with the operation screw 59 of the lock mechanism 53 is activated,
The operation screw 59 is driven to rotate normally. As a result, the slide block 56 moves backward together with the driven block 57 in accordance with the screwing action of the operating screw 59 shown in FIGS. 4 and 6, and the pressure contact engagement between the reference block 61 and the driven block 57 up to that point is released. As a result, the lock state of the switchable jig 45 by the lock mechanism 53 is released. Then, in this unlocked state, the sliding operation of the switchable jig 45, that is, the shift operation becomes possible for the first time.

When the lock is released in this way, the shift table 67 shifts by a predetermined amount by the contraction operation of the shift cylinder 68 shown in FIGS. At this time, the fork 74 on the shift table 67 side and the pin 52 on the switchable jig 45 side are still connected, and at the same time, the nut runner 76 is still fitted or press-contacted to the operation screw 59 on the other side. , The shift table 6 above
In accordance with the shift operation of 7, the slide base 49 on the side of the switchable jig 45 also shifts by the same amount, whereby the locator jig 46 and the gauge 47 in the switchable jig 45 are moved from the switch position PA to the switch position PB. And that position has been switched. Then, the driven block 47 of the lock mechanism 53 is shifted by shifting to the switching position PB.
Comes to face the other reference block 62.

When the shift switching of the switchable jig 45 is completed, the nut runner 76, which is fitted or pressure-contacted with the operating screw 59 of the lock mechanism 53, is restarted to drive the operating screw 59 in the reverse direction. As a result, the operating screw 5
In response to the screwing action of 9, the slide block 56 moves forward again together with the driven block 57, and the driven block 57 comes into pressure-contact engagement with the other reference block 62. As a result, the switchable jig 45 is locked at the switch position PB.

Thus, the switchable jig 45 is moved to the switch position PB.
When switched to, the floor main W2 is received on the switchable jig 45 in the same state as in the previous case. Then, when the floor main W2 is positioned and clamped by the locating pin 6 of the locator jig 46, the cross table 71 of the external drive device 64 retracts, and the transport carriage 40 is sent to the next process.

The above-described series of operations is the same when the shift-type jig 45 is shift-shifted from the shift position PB to the shift position PA.

As described above, according to the present embodiment, shift switching of the switchable jig 45 (locator jig 46) is performed by the external drive device 64, and the lock mechanism 53 of the switchable jig 45 is locked. Since the unlocking operation is performed by the screwing action of the operation screw 59 by an external operation, it is not necessary to attach an actuator or the like to the carrier 40 at all, and the locking state is the tightening force of the operation screw 59. Since it is held by itself, it does not come loose during traveling of the dolly, and the holding force in the locked state is extremely high.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a vehicle body assembly line to which a vehicle body carriage of the present invention is applied.

FIG. 2 is a side view for explaining a main part of the vehicle body carriage.

FIG. 3 is an explanatory plan view of an essential part of FIG.

FIG. 4 is an enlarged explanatory view of the switchable jig shown in FIG.

5 is a front explanatory view of FIG. 4. FIG.

FIG. 6 is a right side explanatory view of FIG. 4.

FIG. 7 is an enlarged explanatory view of the external drive device shown in FIG.

8 is an explanatory side view of FIG. 7.

[Explanation of symbols]

6 Locating pin 40 ... carrier truck 41 ... Bogie body 45 ... Switchable jig 46 ... Locator jig 53 ... Lock mechanism (locking means) 57 ... Driven block 59 ... Operation screw 61 ... Reference block (reference member) 62 ... Reference block (reference member) 64 ... External drive device 67 ... Shift table 68 ... Shift cylinder 71 ... Cross table 72 ... Approach cylinder 74 ... Fork 76 ... Nut runner (external lock operation means) 80 ... External shift means PA ... Switching position PB ... Switching position S1 ... Floor loading process (jig switching stage) W1 ... Floor main (body panel) W2 ... Floor main (body panel)

Claims (4)

[Claims] 1. A vehicle body panel is transported by moving a transportation vehicle having a vehicle body panel positioned and supported via a locator jig along a predetermined transportation path, while a transportation vehicle having finished transportation of the vehicle body panel is transported. A jig switching device for a vehicle body carriage that is returned to the start end of the path for cyclic use, and is a locating pin that is slidably provided on the carriage body of the carrier truck and that positions the vehicle body panel at the tip. In addition, the position of the locate pin can be selectively switched according to the type of the vehicle body panel to be positioned,
Further, a locator jig mechanically coupled to the external shift means and switched to a predetermined switching position by the operation of the external shift means, and an operating screw provided on the locator jig and for locking and unlocking operation. Locking means for mechanically positioning and locking the locator jig at any switching position with reference to the reference member on the bogie body side by operating the operation screw in the forward and reverse directions by the external lock operation means, A jig switching device for a vehicle carrier, comprising: 2. The jig switching device for a vehicle carrier according to claim 1, wherein the position of the locate pin can be selectively switched within a horizontal plane. 3. The jig shift stage set at any position in the transport path of the transport carriage is provided with the external shift means and the external lock operation means. A jig switching device for a vehicle carrier truck according to item 1. 4. A V-block-shaped or mountain-shaped reference block is fixed as a reference member to the trolley body, while the locking means on the locator jig side moves back and forth according to the screwing action of the operating screw. The jig switching device for a vehicle carrier according to any one of claims 1 to 3, further comprising a mountain-shaped or V-block driven block that engages and disengages with the reference block.