JP2003145363A - Workpiece carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece carriage requiring no clamp driving means. SOLUTION: A conical positioning guide member 12 insertable into a hole (h) formed in a workpiece is erected on the workpiece carriage 40. The guide member 12 contains a clamp member 17 which is stored in the guide member 12 at a rising position and moved out of the guide member 12 at a lowering position and displaced to a clamping position where the workpiece is clamp. The motion of the clamp member 17 to be displaced to the rising position and the clamping position is carried out by driving means in a workpiece attaching/detaching station via a toggle mechanism portion 30. An operating rod 31 is protruded sideways to the workpiece carriage 40. The operating rod 31 with its L-shaped upward end 31c in sliding contact with front or back faces of baffle plates 47, 48 is pushed and pulled for clamping or unclamping the clamp member 17.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a work carrier having a work such as an underbody constituting a vehicle body and movable along an assembly line. And a driving means for the positioning clamp is completely eliminated from the carriage, and the positioning clamp is operated by an inclined plate provided before and after the work attaching / detaching position on an assembly line. 2. Description of the Related Art In an assembly line of an automobile body, an underbody is mounted on a work carrier, and various members such as side members and a roof are moved in a plurality of steps while moving the cart along the assembly line. Assemble.
A plurality of positioning clamps are provided on the trolley to clamp the underbody in the positioning state.When assembly of various members to the underbody is completed, the positioning clamps are opened, the underbody is removed from the trolley, and transported to the next process are doing. [0003] In the conventional truck, a driving means such as an air cylinder or a motor is provided for each truck in order to open and close the positioning clamp, and when the truck comes to the work attaching / detaching position of the assembly line and is positioned, An air system and an electric system connected to the driving means are automatically coupled to each other in conjunction with the positioning operation of the bogie itself. [0004] The number of trucks used in one assembly line is very large, and the cost of the trucks accounts for a considerable proportion of the initial capital investment. Particularly, in a multi-model assembly line, the number of types of carts used increases, so that the cost increases accordingly. Among the components of the truck, the driving means for the positioning clamp has a particularly high cost ratio, and its reduction is an issue. An object of the present invention is to automatically open and close a positioning clamp at a workpiece attaching / detaching position without providing a clamp driving means on the workpiece carrier. A work carrier according to the present invention is provided with a work such as a vehicle body mounted thereon and inserted into a clamp hole formed in the work on a work carrier which can move along an assembly line. A positioning guide member having a cone-like shape, and a clamp member which is housed inside the positioning guide member at an ascending position and which is displaced to a clamp position at which the work comes out of the positioning guide member at a lowered position. A positioning clamp, a toggle mechanism for performing a displacement operation of the clamp member to an ascending position and a clamp position, and an operation rod protruding to the side of the work carrier; one end of the operation rod is coupled to the operation rod; A toggle mechanism having a link rod pin-connected to an elevating rod having the other end attached to the clamp member; The clamp member is displaced by driving the tip of the pad by sliding it against an inclined plate disposed on the side of the work attaching / detaching position of the assembly line. The present invention focuses on the fact that the conventional positioning clamp operates only in the process of attaching and detaching the underbody, and does not operate at all in other processes. That is, the positioning clamp closed after the underbody is mounted on the work carrier has been completely closed until various members are assembled to the underbody and the underbody is removed from the carriage. In view of this, the clamp driving means has been completely eliminated from the individual carts, and instead of the clamp driving means, an inclined plate has been arranged on the side of the assembly line where the workpiece is attached / detached. Thus, when the work carrier moves forward and backward from the work attaching / detaching position, the operation rod of the positioning clamp slides on the inclined plate and is driven to open and close the clamp. However, since the positioning clamp needs to maintain the clamped state or the unclamped state even during the movement of the carriage, a toggle mechanism is added to the positioning clamp. The toggle mechanism itself is conventionally known, has no particular mechanical complexity, and can be easily installed at a tenth of the cost of the air cylinder. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows positioning clamps 45 which are vertically disposed at a plurality of positions on a work carrier trolley. The positioning clamps 45 position the underbody W as a work on the trolley 40 as shown in FIG. Is done. 1 and 3, reference numeral 1 denotes a cylindrical pedestal member also serving as an elevating and lowering guide portion of a clamp member 17, which will be described later. The pedestal member 1 includes an upper lid member 3 provided above and below the cylindrical body 2 and a lower member. Together with the lid member 4, it is integrally fixed on the upper lid member 3 with a tension bolt 5. Reference numeral 6 denotes a base plate to which the lower lid member 4 is attached. The pedestal member 1 is provided at its axial center with a through hole 8 through which the lifting rod 7 and the clamp member 17 are inserted. Further, on both sides of the pedestal member 1, upper and lower A guide groove 9 for slidably guiding the pins 19, 20 is formed so as to be deviated laterally as it goes upward. On the other hand, reference numeral 12 denotes a cone-shaped positioning guide member for positioning the underbody W by passing through the hole h of the underbody W.
4 and is formed integrally with the pedestal member 1. On the other hand, the clamp member 17 is fixed to the tip of the lifting rod 7 with a pin 19, and
When the pin 19 is supported by the upper pin 20 joined by the left and right link plates 21 and 21 so as to slide in the guide groove 9, it moves up and down in the guide groove 9 and is pushed up by the lifting rod 7. In order to fit inside the sliding groove 14 of the cone-shaped positioning guide member 12 and when pushed down, the clamp portion 18 at the tip is projected from one side of the positioning guide member 12 to The underbody W is configured to be clamped between the upper body and the clamp surface. In the present invention, a toggle mechanism 30 is provided to hold the clamp member 17 in the clamped state and the unclamped state. The toggle mechanism 30 has a pair of stoppers 31a, 31b at a predetermined interval, and is provided with inclined plates 47, 4 to be described later, which are disposed before and after the work attaching / detaching position on the assembly line.
An operating rod 31 driven in the horizontal direction by 8;
One end (lower end) of the link rod 33 is rotatably connected to the operation rod 31 by a pin 32, and the other end (upper end) of the link rod 33 is connected to the clamp member 1 by a pin 34.
A pin 34 rotatably connected to the lower end of the lifting rod 7 to which the lifting rod 7 is attached, a stopper disk 35 fixed in the middle of the lifting rod 7, and a recess 3 of the disk 35 and the upper lid member 3.
a and a spring 36 interposed in a compressed state. The work carrier 40 is described in detail in FIG.
As shown in FIG. 3A, a base 43 having a plurality of wheels 41 on both left and right sides and capable of running on a pair of rails 42 is fixed on the base 43 by fixing means (not shown) of the base 43. A jig plate 44 and positioning clamps 45 erected at a plurality of positions on the jig plate 44. A pair of right and left support columns 46 are erected on the ground before and after the work attachment / detachment position on the assembly line, and inclined plates 47 and 48 are disposed at the upper ends of the support columns 46. Inclined plates 47, 4
Numeral 8 has a constant height in the traveling direction of the bogie, and is inclined in a C shape or an inverted C shape in plan view. Specifically, one inclined plate 47 is provided on both left and right sides of the work mounting position, as shown in FIG.
As shown in FIG. 2 (C), the inclined plates 48 are arranged at an angle in the shape of a letter "C" so as to gradually narrow the mutual distance in the traveling direction of the bogie as shown in FIG. It is disposed in an inverted C-shape so as to gradually widen the mutual distance in the traveling direction of the carriage 40. Then, the L-shaped upward end portion 31c of the operating rod 31 is slidably guided along the front or back surfaces of the inclined plates 47 and 48 as the carriage 40 moves, whereby the operating rod is pushed and pulled. It has become. Next, the operation of the work carrier 40 and the positioning clamp 45 will be described. When the empty work carrier 40 with the positioning clamp opened is conveyed to the underbody mounting position, a sensor (not shown) detects the arrival of the carrier 40 and the underbody W is mounted on the carrier 40 by the carrier. . At this time, as shown by the solid line in FIG. 1, since the clamp member 17 is in the raised position and is housed in the sliding groove 14 of the positioning guide member 12, when the underbody W is mounted on the bogie, the positioning guide member 12 are smoothly inserted into the holes h on the floor of the underbody W. Then, the inner periphery of the hole h is guided by the cone-shaped positioning guide member 12, and the center of the hole h is made to coincide with the center of the positioning guide member 12, whereby the underbody W is positioned. Next, another sensor detects completion of mounting of the underbody W, and based on this detection signal, the carriage 40 moves forward in the direction of the arrow as shown in FIG. At this time, the distal end portion 31c of the operating rod 31 slides against the front surface of the inclined plate 47 as the carriage 40 moves, and is pressed.
Is pushed leftward from the state of FIG. Operation rod 31
Is pushed to the left, one end (lower end) of the link rod 33
Moves in the left direction in the figure, and the spring 36 suddenly expands due to its elastic force and presses the upper surface of the disk 35 to lower the lifting rod 7.
Is lowered. Then, the operation rod 31 stops at a position where the stopper 31b abuts on the inner wall surface of the cylindrical body 2. In this manner, in the state shown in FIG. 4 in which the stopper 31b of the operating rod 31 is in contact with the inner wall surface of the cylindrical body 2, the rod 31 is curved so as to be deviated laterally as it goes upward. The pin 20 in the guide groove 9 causes the clamp portion 18 of the clamp member 17 to be positioned by the positioning guide member 12.
, And clamps the underbody W between itself and the clamp surface on the upper surface of the pedestal member 1. In this clamped state, the carriage 40 is sequentially conveyed to each process along the assembly line, and various members are assembled. When the assembly of the predetermined members to the underbody W is completed and the carriage 40 is conveyed to the underbody removal position, the distal end portion 31c of the operating rod 31 moves on the back of the inclined plate 48 with the movement of the carriage as shown in FIG. As described above, the operation rod 31 is pulled by the sliding contact, and the operation rod 31 is moved rightward as in FIG. When the operation rod 31 moves rightward,
The stopper 31a provided on the operation rod 31 stops at a position where it comes into contact with the inner wall surface of the cylindrical body 2. In this state, as shown in FIG. 1, the link rod 33 is in a substantially upright state (preferably, the upper end of the link rod 33 is slightly inclined leftward), and the lifting rod 7 is elastically moved by the spring 36. The disc 35 is raised against the force, and the disc 35 comes into contact with the lower surface of the upper lid member 3 and stops. At this time, the clamp member 17 located above the elevating rod 7 rises, and the clamp member 17 is housed in the sliding groove 14 of the positioning guide member 12. Therefore, the floor of the underbody W is moved to the positioning guide member 1.
2, and the underbody W is transported to the next step by the transport device. As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the underbody of the vehicle body is exemplified as the work, but the present invention is not limited to this, and is applicable to any work that is mounted and transported on a bogie in a positioned state. Further, in the present invention, the inclined plate is inclined in the left-right direction toward the bogie traveling direction. However, when the moving direction of the operation rod 31 is changed to the vertical up-down direction, the inclined direction of the inclined plate also moves toward the bogie traveling direction. Various modifications are possible according to a change in the positioning clamp side, such as in the vertical direction. According to the present invention, a toggle mechanism is attached to the positioning clamp on the work carrier as described above, and the toggle mechanism is driven by an inclined plate disposed before and after the work attaching / detaching position to clamp the clamp. Opening and closing, the clamp drive means provided on the truck itself can be completely eliminated, so that the structure of the truck can be simplified, the weight and cost can be reduced, and the initial capital investment can be greatly reduced. It becomes.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an open longitudinal sectional view of a positioning clamp provided on a work carrier of the present invention. FIG. 2A is a front view of a work carrier at a work mounting position, FIG. 2B is a plan view of the work carrier at a work mount position, and FIG. 2C is a plan view of the work carrier at a work removal position. FIG. 3 is an open longitudinal sectional view of a positioning clamp in which a direction viewed from FIG. 1 is changed by 90 degrees. FIG. 4 is a longitudinal sectional view showing a closed state of a positioning clamp provided on the work carrier of the present invention. FIG. 5 is a longitudinal sectional view of the positioning clamp in a closed state in which the direction viewed from FIG. 4 is changed by 90 degrees. FIG. 6 is a perspective view of an inclined plate and a positioning clamp at a workpiece removal position. DESCRIPTION OF SYMBOLS 1 Base member 2 Cylindrical body 3 Upper lid member 3a Depression of upper lid member 4 Lower lid member 7 Elevating rod 8 Through hole 9 Guide groove 12 Positioning guide member 14 Sliding groove 17 Clamp member 18 Clamp parts 19, 20 Pin 21 Link plate 30 Toggle mechanism 31 Operation rods 31a, 31b Stopper 31c L-shaped upward end portions 32, 34 Pin 33 Link rod 35 Disk 36 for stopper Spring 40 Work transport carriage 44 Jig plate 45 Positioning clamp 47 , 48 Inclined plate W Under body h hole

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Claims (1)

Claims: 1. A cone-shaped positioning guide member which can be inserted into a clamp hole formed in a work, on a work carrier having a work such as a vehicle body mounted thereon and movable along an assembly line, A positioning clamp which is housed inside the positioning guide member at an ascending position and which is displaced to a clamp position at which the work comes out of the positioning guide member at a lowered position and clamps the work; and a rising position of the clamp member. And a toggle mechanism for performing a displacement operation to a clamp position, the operation rod protruding to the side of the work carrier, and a lifting rod having one end connected to the operation rod with a pin and the other end attached to a clamp member. And a toggle mechanism having a link rod pin-connected to the assembly line. Workpiece transfer carriage, characterized in that so as to displace operating the clamping member by driving by sliding contact with the inclined plate which is disposed at a position laterally.