JPH0215480B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention is directed to, for example, an automobile welding line in which a table for lifting an automobile from a conveyance line position to a working position is lifted and stopped to a position close to the underside of the automobile, and then further This invention relates to a two-stage motion table lifting device that lifts an automobile to a predetermined working position with almost no impact.

(Prior art) Conventionally, for example, a table is raised to a position close to the lower surface of a workpiece waiting to be placed above the table and then stopped, and then the workpiece is lifted to a predetermined position necessary for the work without inertia.
Generally speaking, a stage motion lifting device is capable of raising and lowering the entire lift amount from the lowest end position to the predetermined position, and once the table reaches the workpiece proximity position in the middle of the total lift amount, the drive is temporarily stopped. A method in which the table is stopped and then restarted to raise the table to a predetermined position at the highest end (former)
Then, the lift amount is from the lowest end of the total table lift amount to the workpiece proximity position in the middle of the total lift amount. There is a parent-child system (latter) that is equipped with a child lifting device whose lift amount is up to a fixed position, but in the former case, if a crank is used for drive, the table will stop near the workpiece in the middle of the total lift amount. - Since the start is at the highest speed position in the crank motion, stopping the table near the workpiece not only has poor stopping accuracy but also has a large impact on the workpiece. ) type or stacked (parent-child) type lifting device using a motor and cylinder, the parent lifting device must lift the entire child lifting device together with the drive device, so the power of the parent lifting device is used to lift the child. In addition to the drawback that the entire device must be made larger to lift it, both use a direct-acting actuator as the drive source for the lift, so special speed control is required to slow down and up the workpiece. This method requires a device, and has the disadvantage that the structure is complicated and the cost of the device is high.

(Object of the Invention) An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional art by providing a table lifting device that has a simple structure and can easily raise and lower a workpiece smoothly on a two-stage motion table. .

(Structure of the Invention) As shown in FIG.
A plurality of levers 5 on the trolley 3 swing by reciprocating movement of the trolley 3 via a motor-driven first crank mechanism 1 attached to the main body frame 2, and a vertical movement is made via a connecting rod 6 to the main body frame 2. The table 8, which is movably mounted and supported by the plurality of levers 5 via the rollers 7 at the tips thereof, is moved up and down by a first stroke by slowing up and slowing down, and is driven by a motor mounted on the main body frame 2. The table 8 is rotated by the swinging of the plurality of levers 5 on the trolley 3 via the second crank mechanism 4 of the
This is a table lifting device that moves the table up and down in a second stroke by slowing up and slowing down.

(Embodiment of the invention) FIGS. 2 to 5 show an embodiment of the present invention,
A trolley 12 supported reciprocally on rails 10 on the main body frame 9 via wheels 11 is connected to a first crank mechanism 1 attached to the main body frame 9.
3. In this case, a first crank mechanism 1 in which a crank arm 15 rotating via a motor 14 with a speed reducer and a truck 12 are connected by a connecting rod 16.
It moves back and forth at 3.

Four support levers 19 and two connection levers 20 fixed to a shaft 18 are connected to the bearing 17 on the upper surface of the truck 12 via connecting rods 21 connected to the connection levers 20. These levers 19, 20 are mounted so as to be swingable.
The second crank mechanism 22 mounted on the main body frame 9, in this case a crank arm 24 rotating via a motor 23 with a speed reducer, and one of the connecting levers 20 are connected by a connecting rod 25. In addition to being swing-driven via the crank mechanism 22, each lever 19, 20 is driven by the first crank mechanism 13, and the position of the shaft 18 of each lever 19, 20 is moved together with the trolley 12. It is also driven to swing.

On the other hand, the connecting rod 2 is attached to the main body frame 9.
Table 2 is positionably articulated via 6.
7 is a guide rail 28 attached to its lower surface.
A roller 30 rotatably attached to the tip of the support lever 19 is rotatably fitted into the groove 29 and supported.

In the table lifting device 31 configured in this way, when the crank arms 15, 24 of the crank mechanisms 13, 22 are in the positions shown in FIG.
2 is the stroke end on the left side in the illustration, and each lever 1
9 and 20 are at the right end of the singing motion in the figure, so the table 27 is located at the lowest end.

In this way, when the table 27 is located at the lowest end, if only the first crank mechanism 13 is driven to rotate the crank arm 15 by 180 degrees and stop it, the trolley 12 moves from the left stroke end in the figure. As it moves to the right stroke end, the shaft 18 around which each lever 19, 20 rotates also moves, so that each lever 19, 20 swings to the left in the figure about the shaft 18, and the table 27 moves as a crank. 1st in slow-up and slow-down
The first stroke by only the crank mechanism 13, in this case, moves from the lowest end of the lower lift amount to the highest end of the workpiece proximity position.

Next, when the table 27 reaches the workpiece proximity position, only the second crank mechanism 22 is driven to rotate the crank arm 24 by 180 degrees and stop it, so that each lever 19, 20 rotates around the shaft 18. The table 27 moves to the left swing end in the figure, and the table 27 moves to the second swing end.
The second stroke by only the crank mechanism 22, in this case, the upper lift amount, that is, the lift amount from the lowermost end of the workpiece proximity position to the highest end of the predetermined work position, is slowed up by the crank movement by the crank arm 24.・The slowdown is further affected by the swinging of the support lever 19 near the top dead center, resulting in extremely smooth movement.
Workpieces such as automobiles that have been waiting on the transfer surface during this lifting process are lifted to a predetermined working position without being subjected to any mechanical shock, and after work such as workpiece welding is completed, the workpieces are slow-lifted in the same way as the reverse of the above. - Due to the slowdown operation, the table 27 further descends with the workpiece placed on the conveyance surface, and both crank mechanisms 13 and 22 are activated to move to the lowest position of the total lift amount and stop. .

In this way, in the case of this table lifting device 31, only the table 27 can be raised and lowered individually by both crank mechanisms 13 and 22, and the table 27 can be raised and lowered individually.
In order to move the support lever 19 near its top dead center in the ascending state with the workpiece placed on the first crank mechanism 13, each crank mechanism 13, 22
The power of the table 27 is relatively small.
Since the stopping accuracy at a position close to the workpiece is extremely high, the workpiece can be raised and lowered together with the table 27 substantially without mechanical shock.

Next, FIG. 6 shows another embodiment of the present invention, in which the table 34 rises from the tilted state at the lowest end and becomes horizontal due to the reciprocating movement of the cart 33 by the crank mechanism 32. As shown in FIG.
By forming 4 into an H shape or a frame shape, the present invention has a great feature in that it can be used as a floor-standing simple lift device for car maintenance, and allows the car to get on and off the table 34 by itself.

The support lever 39 is bifurcated so as not to interfere with the guide rail 37, and the connecting lever 40 is attached to the outside of the table 34 so as not to interfere with the running of the automobile. Depending on the degree of inclination and the structure of the main body frame 35, the auxiliary stand 41 can be omitted.

(Effects of the Invention) The present invention swings the table support lever on the trolley by moving the trolley using the crank mechanism between the main body frame and the trolley, and also swings the lever by using the crank mechanism between the main body frame and the lever. By swinging, the structure of the table lifting device is simplified, and the stopping accuracy at each stage of the table's two-stage motion is improved, and the power of each crank mechanism is increased while maintaining sufficient lifting capacity. There are effects that can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram clearly showing the configuration of the present invention,
2 to 4 are front views of one embodiment of the present invention in various operating states, FIG. 5 is a plan view thereof, and FIG. 6 is a front view of another embodiment of the present invention. 1, 4...Crank mechanism, 2...Main frame, 3...Dolly, 5...Lever, 6...Connecting rod, 7...Roller, 8...Table.

Claims (1)

[Claims] 1 Motor-driven first motor attached to main body frame 2
By the swinging of the plurality of levers 5 on the truck 3 due to the reciprocating movement of the truck 3 via the crank mechanism 1,
The table 8, which is attached to the main body frame 2 via a connecting rod 6 so as to be movable up and down and is supported by the plurality of levers 5 via rollers 7 at their tips, is moved up and down in a first stroke by slowing up and slowing down. The table 8 is slowed up and slowed down by swinging the plurality of levers 5 on the trolley 3 via a motor-driven second crank mechanism 4 attached to the main body frame 2. A table lifting device characterized by vertical stroke movement.