JPS6234517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a device for inverting a workpiece in a fixed position or moving it in the middle of conveying the workpiece between press machines in a press line.

Conventionally, a method for reversing a workpiece is, for example, once fitting the workpiece into a U-shaped frame below the transport surface and rotating the frame 180 degrees during transport. Since the frame reversing device must be integrated into the conveyance surface, the conveyance device is special and considerably complicated, and there is also the problem that the workpiece conveyance capacity is reduced.
There is also a method of flipping the workpiece by once standing the workpiece upright during transportation and then brushing off the lower end of the workpiece, but either method requires a large-scale device and is generally complicated in the reversing operation, making it difficult to transport the workpiece. There were problems such as decreased ability.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional workpiece by providing a workpiece reversing device that has a simple structure and can be easily turned over.

Next, the configuration of a first embodiment of the present invention will be explained with reference to FIGS. 1 to 5.

Swing arms 4 and 5 are rotatably connected to the left and right sides of the frame 1 via bearings 2 and are opposed to each other via a shaft 3. A crank mechanism is connected to one of the swing arms 4. In this case, a crank mechanism consisting of a crank arm 8 and a rod 9 attached to the shaft of a reducer 7 driven by a motor 6 on the frame 1 swings at an angle of β about a vertical line. .

A pair of integral sprockets 10 are rotatably attached to the upper ends of the swinging arms 4 and 5 via bearings 11, and each sprocket 10 has a length adjustable sprocket attached to the frame 1 via a threaded rod 11. One chain 12 is rotatably attached to the frame 1 and the other chain 17 is attached to the frame 1 via a rotating hook 16 which is rotatable via a shaft 13 and whose rotational force is adjustable via a spring 14 and a threaded rod 15. The chains 12, 17 are hung on their corresponding sprockets 10A, 10B, and the other ends of each chain 12, 17 are fixed via a stopper 18, and in this way, the chain 1
2, 17 are tensioned, the swinging arms 4, 5 are at β
When angularly oscillated, the sprocket 10 rotates approximately 180 degrees in the opposite direction to the oscillating arms 4 and 5.

The sprocket 10, which rotates approximately 180 degrees by the β-angle swing of the swing arms 4 and 5, has workpiece gripping clamp arms 20 and 21 which are used to unclamp and unclamp the workpiece by the operation of the air cylinder 19.
A gripping device 22 that opens and closes in response to the clamp is attached, and in this attachment device, the clamping position of the workpiece by the gripping device 22 is adjusted so that when the swinging arms 4 and 5 are located at the stroke end, A straight line connecting the center of rotation of the sprocket 10 at each stroke end of the arms 4 and 5, in this case, the swing angle 1/2 on the line L in Figure 1 of the conveyor line.
It is set to be located at.

In the work reversing device configured as described above, when the crank arm 8 is rotated by 180 degrees via the motor 6 and the swing arms 4 and 5 are rotated by an angle of β from the solid line in FIG. 1 to the two-dot chain line position, for example, The clamp arms 20 and 21 of the gripping device 22 are rotated approximately 180 degrees counterclockwise in FIG. The arms 4, 5 return from the two-dot chain line state in FIG. 1 to the solid line state, and in this state, the clamp arms 20, 21 of the gripping device 22 return to their original states.

Therefore, when the swinging arms 4 and 5 are positioned in the solid line state in FIG. 1, after the gripping device 22 controls its air cylinder 19 to grip the workpiece, the swinging arms 4 and 5 are positioned in the solid line state in FIG. When the workpiece is positioned as indicated by the two-dot chain line, the workpiece is inverted at the fixed position, and at this position, the air cylinder 19 is controlled to remove the workpiece from the gripping device 22, and the swing arms 4 and 5 are moved to the second position. By repeating the above operation again after returning to the state shown by the solid line in FIG. 1, the workpiece can be easily reversed to a fixed position at a specific position during the workpiece conveyance.

FIG. 6 shows a second embodiment of the present invention, in which the gripping device 24 grips the workpiece at the stroke end position of the swinging arm 23 at the outside of the swinging angle of the swinging arm 23, and the chain 2
5 and 26 are hung and locked on the lower side of the sprocket 27, and the swinging arm 23 swings to rotate the sprocket 2.
7 is the same rotational direction as the swinging arm 23, and the workpiece clamped by the gripping device 24 is reversed and laterally moved by rotating the sprocket 27 by approximately 180° due to the β angle of the swinging arm 23. The structure, function, and effect are almost the same as those of the first embodiment.

In addition, as shown in FIG. 7, a rod 43 of a crank mechanism, which reciprocates as a crank arm 42 is rotated by a motor 41 on a frame 40, is rotated by a swinging arm 44 via a motor 45 and a speed reducer 46. It is articulated to the crank arm 47 that can be attached,
Each crank arm 4 by each motor 41, 45
2,47 Swinging arm 4 by individual 180° rotation
4 can be controlled in two positions, 1/2 β angle and β angle,
By reciprocating the swinging arm 44 through a 1/2β angle, the gripping device 49 can be rotated approximately 90 degrees together with the sprocket 48, thereby adding a function to the swinging arm 44 as an intermediate lift during workpiece conveyance.

Next, the effects of the present invention will be explained.

The present invention includes a pair of left and right swinging arms that are attached to a frame so as to be able to swing in synchronization at a preset angle via external power, and a pair of left and right swinging arms that are rotatable facing each other. a rotary body that is a set of two integrated sprockets that is attached to the swing arm and can be moved by a fixed distance in a straight line by the swinging of the swing arm at a certain angle; In order to rotate the rotating body approximately 180 degrees forward and reverse by the swinging of the swinging arm, windings are alternately wound between each of the rotating bodies of the pair and the frame by the swinging of the swinging arm. A string-like body, such as a chain, which is attached so that it can be taken up and unwound, and a tensioning direction attached to the string-like body between the string-like body and the frame in order to rotate the rotating body forward and backward without play. The biasing force means attached to be able to apply a force and the rotating body attached facing each other to the left and right pair of swinging arms are at the same angle and the same radius position, and the swinging arm swings at a constant angle. The workpiece reversing device is provided with gripping tools for attaching and removing the workpieces, which are attached facing each other so as to be movable to the same position or to a position twice the predetermined distance by rotating the rotating body through approximately 180 degrees.

As a result, the present invention allows a plate-shaped workpiece transported between a pair of left and right swinging arms to be easily reversed using a simple mechanism consisting of a swinging arm, a rotating body, a string-like body, and a gripping tool. The rotating body at the tip of the swinging arm, which bears the entire weight of the workpiece, can be positioned with high precision at the original position or twice the fixed distance. By supporting it while pulling it with a string-like body, it is possible to prevent backlash from occurring and to obtain a highly accurate and stable positioning and reversing operation.

[Brief explanation of the drawing]

1 is a front view of the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a plan view thereof, and FIG. 4 is a front view of the gripping device 22, FIG. 5 is an explanatory diagram showing the state in which the chains 12 and 17 are hung, FIG. 6 is a front view of the second embodiment of the present invention, and FIG.
The figures are explanatory diagrams of other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Frame, 4, 5, 23... Swinging arm, 6... Motor, 10, 27... Sprocket, 12, 17... Chain, 14... Spring, 22... Gripping device.

Claims (1)

[Claims] 1 A pair of left and right swinging arms are attached to the frame so that they can swing at a preset fixed angle synchronization via external power, and a pair of left and right swinging arms are attached to the pair of left and right swinging arms so that they can rotate while facing each other. The rotating body is made up of a set of two pieces and can be moved by a fixed distance in a straight line by the swinging of the swinging arm at a certain angle. A string-like body is attached between each rotating body in a set of two and the frame so that each rotating body can be wound up and unwound alternately by the swinging of a swinging arm in order to rotate the rotating body in forward and reverse directions. In order to rotate forward and backward without play, a set of two rotary members is attached to at least one side between the string-like body and the frame so as to be able to apply a biasing force in a tensile direction to the string-like body. The urging force means and the rotating body mounted facing each other on the pair of left and right swinging arms are at the same angle and the same radius position, and the rotating body is rotated by approximately 180 degrees by swinging the swinging arm at a constant angle. 1. A workpiece reversing device, comprising: a workpiece attachment/detachment gripper mounted facing each other so as to be movable to the same position or to a position twice the predetermined distance.