JPH0120327Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a dolly for transporting automobile bodies in a paint factory, etc., so that painting work can be performed using a robot or the like during the transport. The present invention relates to a drive device, and more particularly to a pusher dog for a chain conveyor configured to maintain the speed of the dolly constant at all times.

(Prior art) When a painting robot is used to automatically paint a body placed on a dolly in a paint factory, etc., the dolly is moved by a chain conveyor placed along the line of the paint factory. I try to work while doing it.

Conventionally used devices include, for example, Japanese Patent No. 1206222 (Japanese Patent Publication No. 58-39100)
A device as shown in is used. In this device, as shown in Figures 3 and 4 of the same publication, tow pins protruding from the underside of the dolly are held between a pusher and a retainer, and a carrier body supporting these dogs is used. As the is moved with the drive chain,
I try to move the dolly.

In this device, when the stopped dolly is to be moved by the chain conveyor, the retainer comes into contact with the tow pin that is positioned and waiting on the path of the conveyor, and this is swung to move the tow pin down. After passing through, the pushers are abutted and locked, whereby the dolly is moved together with the carrier body.

However, in order for the retainer, once swung by the tow pin, to return to its original position where it is in a standby position to prevent the toe pin from running ahead of itself, it is necessary to
It is necessary to provide extra space for the retainer to swing, and it is necessary to form the space between the pusher and the retainer wider than the width of the tow pin, but in order to do so, the speed of the drive chain must be kept constant. Even if it is set, there is a drawback that the speed of the dolly is not constant.

In other words, the dolly is driven at an inconsistent speed, such as moving faster or slower in the play between the dog spacings mentioned above, and the synchronized position of the drive chain and dolly is within the gap. Defects such as parts shifting may occur,
An inconvenient situation sometimes occurs when automatic painting is performed using a painting robot.

Therefore, in order to solve the above-mentioned problems, the applicant of the present invention devised a device consisting of a pusher 3 and a retainer 5 having the structure shown in FIG. In this device, the radius of curvature of the engaging surface 6 of the retainer 5 with the tow pin 2 is formed to be a radius R with the axis 7 of the retainer 5 as the center. As soon as the side surface of the retainer 5 is engaged with the pressing surface 4 of the pusher 3, the retainer 5
is swung to come into contact with corner a.

However, even in the device shown in Fig. 3, if there are manufacturing errors in each member, the tow pin 2
However, it has not yet been possible to reliably eliminate the shortcomings, such as looseness in the locking part and difficulty in maintaining a constant speed during conveyance, and further improvements are desired. .

(Purpose of the invention) The present invention eliminates the drawbacks of the conventional device described above. By changing the shape of the engagement surface of the retainer with the toe pin, a gap is created between these members. Therefore, it is an object of the present invention to provide an apparatus in which the body to be painted is moved integrally with a drive chain at a predetermined speed.

(Structure of the invention) In the pusher dog for a chain conveyor of the present invention, the surface that engages with the tow pin of the retainer, which is provided in opposition to the pusher that acts to push the tow pin and prevents the dolly from running ahead, is connected to the axis of the retainer. It is formed by an arc with its center vertically below.

When the dolly is to be engaged with the conveyor, the tow pin of the stopped dolly passes through the retainer with its head lowered, contacts the pressing surface of the pusher, and pushes the dolly in that state to move it. At this time, the engaging surface of the retainer immediately returns to its original position, comes into contact with the corner of the toe pin, and acts to securely hold the toe pin between the pusher and the retainer. Do it.

Therefore, in the device of the present invention, when the tow pin is held in the dog device, there are no gaps or the like between the respective members.
The tow pin can be held securely, which allows the dolly to move smoothly at the same speed as the chain, ensuring that color unevenness is prevented when painting with an automatic painting device. It will be possible.

(Embodiment of the invention) The structure of the apparatus of the invention will be explained according to the illustrated example. As shown in FIG. The pusher 3 and the retainer 5 are each swingably supported via the pusher 3 and the retainer 5.

The pusher 3 of the present invention is provided with a pressing surface 4 formed vertically at its tip, and furthermore, the member on the opposite side of the shaft 3a is formed as a weight member, and the pusher 3 is By swinging through 3a, it is maintained engaged with the tow pin 2 of the dolly.

Further, the retainer 5 of the present invention is swingably supported by a shaft 7, and its overall shape is slightly smaller than the pusher 3 described above, and the tow pin 2
The distal end of the retainer 5 that comes into contact with the retainer 5 is provided with an engaging surface 6 formed in an arc shape, and the other end is provided with a weight member, so that the retainer 5 as a whole is always rotated counterclockwise. The engagement surface 6 is always urged upward.

The engagement surface 6 formed at the tip of the retainer 5 of the present invention is formed into an arc shape with a radius Ra centered on a point 8 located vertically below the shaft 7 at a slight interval. This radius Ra is set larger than the radius R shown in the conventional example, and due to this configuration, as shown in FIG. The tip of the retainer 5 that comes into contact with the pressing surface 4, but is pushed down first,
It tries to stand up due to the weight of the weight at the other end.

In that case, the gap initially formed between the two members becomes gradually smaller as the engagement surface 6 of the retainer 5 is swung upward, and gradually becomes the state shown in FIG. This ensures that the tow pin 2 is held from both sides.

Further, in the case of the embodiment of the present invention, even if there is a manufacturing error in the shape of the toe pin 3, and even if there is a slight manufacturing error in each engagement surface of the pusher 3 or the retainer 5, In the retainer 5 of the present invention, since the radius of curvature of the engaging surface 6 is formed as described above, when the retainer 5 is raised after being pushed down, the corner a of the toe pin 2 and the retainer 5 The distance between the engagement surface 6 and the engagement surface 6 gradually becomes zero, and the engagement between the two is ensured before completely returning to the original state.

In addition, when the conveyance path is inclined in the downward direction, the angle at which the force is applied is such that the retainer 5 is pushed from the toe pin 2 side. The direction is downward by an angle α with respect to the line connecting the .

As shown in FIG. 1, this angle α is a force that tries to rotate the retainer 5 in a clockwise direction, and is not in a direction that allows the retainer 5 to fall and the toe pin 2 to escape from the engagement surface 6. .

Therefore, in the device of the present invention, the angle α
By appropriately selecting the length of the radius Ra and its axis, you can ensure that the dolly is held securely even when a force is applied from the opposite direction. This makes it possible to perform painting work on bodies, etc. placed on the machine while moving them at precisely set speeds.

(Effects of the invention) Since the device of the invention has the above-described configuration, even if there is a manufacturing error in the tow pin on the dolly side, the distance between the two can be reduced to zero.
allows it to be held.

Furthermore, even if the dolly is used for a long period of time and its wheels wear out, and the toe pin becomes lower, the engagement action will be affected by the slight difference in the height of the tow pin. Rather, no gap or the like is generated between the toe pin and its holding member.

Furthermore, since the device of the present invention can move the dolly accurately at the same speed as the chain conveyor, when used in an automatic painting device, it has the effect of reliably preventing coating unevenness. Enables you to perform to your full potential.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the structure of the device of the present invention, FIG. 2 is a side view showing the structure of each member, and FIG. 3 is a side view showing the structure of a conventional device. Symbols in the diagram: 1... Chain, 2... Tow pin,
3... Pusher, 4... Pressing surface, 5... Retainer, 6... Engaging surface, 7, 8... Shaft.

Claims (1)

[Scope of utility model registration request] The dolly has a hanging tow pin that engages with the pusher and receives a driving action, and the chain side has a pusher for pushing the tow pin and a retainer that prevents the dolly from running ahead. The two dogs are provided to be swingable through their respective shafts, and the retainer is further characterized in that the shape of the surface in contact with the toe pin is formed by an arc having its center at the bottom in the vertical direction of the support shaft. Pushyard dog for chain conveyor.