JPH0824730A - Reciprocator for painting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a reciprocator for moving a painting gun capable of improving the painting quality. [Constitution] In a reciprocating machine for painting, in which a painting unit 6 equipped with a painting gun 5 is horizontally reciprocated along a guide rail 4 to spray paint from the painting gun 5.
A counterweight 8 having substantially the same weight as the coating unit 6 is slidably provided along the guide rail 4, and the rack 23 provided on the counterweight 8 and the rack 16 provided on the coating unit 6 are engaged with the pinion gear 26 of the synchronization mechanism 10. Then, the counterweight 8 is reciprocated in the opposite direction in synchronization with the movement of the coating unit 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocator for horizontally reciprocating a coating gun.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 63-88067 discloses a device for painting the upper surface of an automobile body.
An automatic coating device disclosed in Japanese Patent Publication is known.

In the automatic coating apparatus disclosed in the above publication, the coating gun is movable along a guide rail installed above the vehicle body, and the coating gun is sprayed downward while horizontally reciprocating the coating gun. Therefore, the upper surface of the vehicle body below is painted.

To coat the entire upper surface of the vehicle body with the above apparatus, for example, when the moving direction of the coating gun is the vehicle width direction, the vehicle body is moved in the vehicle length direction or the coating gun is moved in the same direction. I try to send it.

[0005]

However, in the above-mentioned device, the coating gun swings, especially when the moving direction of the reciprocating coating gun changes, and the coating film thickness becomes uneven. There is a problem that uneven coating occurs.

On the other hand, in order to eliminate such a coating failure, it is conceivable to lengthen the reciprocating stroke of the coating gun so that the moving direction conversion point is off the upper surface of the vehicle body. However, there is a problem that the coating time becomes longer and the takt time becomes longer.

Further, if an attempt is made to increase the reciprocating speed of the coating gun in order to improve the coating efficiency, a large impact is applied to the coating gun when the moving direction is changed, and the quality of the coating gun is not only deteriorated but also the quality of the coating gun is deteriorated. It causes the breakdown of the.

[0008]

In order to solve the above problems, the present invention provides a coating reciprocator in which a coating unit movable along a guide member is reciprocally movable in the horizontal direction by a driving means. A weight member that can be horizontally moved along is provided, and the weight member can be reciprocated in the opposite direction in synchronization with the movement of the coating unit by the drive control means.

Further, the weight member has substantially the same weight as that of the coating unit, and is reciprocally moved at substantially the same stroke as the moving stroke of the coating unit.

[0010]

When the coating unit reciprocates along the guide member, an inertial force acts on the coating unit, and this inertial force changes greatly when the moving direction of the coating unit changes. Then, with the large change in the inertial force, the coating gun shakes.

Therefore, by canceling the inertial force of the coating unit with the weight member, it becomes possible to suppress the swinging of the coating gun. Therefore, a weight member is provided on the guide member in the reciprocator system series, and the weight member is reciprocated in the opposite direction in synchronization with the reciprocation of the coating unit.

At this time, the weight member is made to have substantially the same weight as the coating unit, and the weight unit is moved at substantially the same stroke as the moving stroke of the coating unit, so that complicated control is not required and the apparatus can be simplified.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a front view of a coating apparatus to which the coating reciprocator according to the present invention is applied, FIG. 2 is a side view of the coating apparatus, FIG. 3 is a front view of the reciprocator, and FIG. 4 is a plan view of the reciprocator. It is a figure.

The coating reciprocator of the present invention is applied to a coating apparatus for applying a base coat coating to the upper surface of a vehicle body of an automobile. The coating apparatus is, as shown in FIGS. 1 and 2,
It is provided with a gate-shaped column 1 and an elevating beam 2 which is vertically movably mounted on the column.

The lifting beam 2 is used as a lifting drive source 3
And a guide rail 4 as a guide member is provided on the lower surface of the elevating beam 2 so that a coating unit 6 having a plurality of coating guns 5 can be horizontally moved. Engaged.

An explosion-proof servomotor 7 as a driving means for reciprocally driving the coating unit 6 is provided at one end of the elevating beam 2, and the coating unit 6 is also provided.
A counterweight 8 as a weight member is provided to prevent the coating gun 5 from swinging when reciprocating.

The counterweight 8 is reciprocated in the opposite direction to the moving direction of the coating unit 6 by the synchronizing mechanism 10 as a drive control means, so that the inertial force when the coating unit 6 reciprocates is canceled. ing.

The coating unit 6 has a pair of slide members 11 slidably engaged with the guide rails 4.
As shown in FIG. 2, a bracket 12 projecting forward from each slide member 11, a support bar 13 attached to the bracket 12, and the coating gun 5 attached to the support bar 13 are provided. There is. Incidentally, each of the coating guns 5 is adapted to be able to spray downward the paint sent from a supply source (not shown).

A connecting member 14 to which a connecting bar 20 which will be described later is linked is attached to an intermediate portion of the supporting bar 13, while a rack supporting member 15 as shown in FIG. 3 is attached to the slide member 11 on one side. And the rack 16 is horizontally attached to the rack supporting member 15.

The servomotor 7 is fixed to the lower rear portion on one end side of the elevating beam 2 and is connected to the servomotor 7 via a speed reducer 17 as shown in FIG.
Is extended in the front-rear direction, and a crank rod 19 is attached to its tip.

A connecting bar 20 is linked between the crank rod 19 and the support bar 13 to transmit the rotation of the servo motor 7 to the crank rod 19 and the rotation of the crank rod 19 to the coating unit 6. I am trying to convert it to reciprocating motion.

As shown in FIG. 5 which is an enlarged view of a main part of FIG. 3 and FIG. 6 which is a side view thereof, the counterweight 8 includes a slide portion 21, a weight portion 22 and a rack 23. Are slidable with respect to the guide rail 4.

The weight portion 22 has almost the same weight as the coating unit 6, and the rack 23 attached to the weight portion 22 has a predetermined space below the rack 16 attached to the coating unit 6 side. And are facing in parallel.

As shown in FIGS. 5 and 6, the synchronizing mechanism 10 includes a support arm 24 fixed to the beam 2, a shaft 25 attached to the tip of the support arm 24, and a tip of the shaft 25. Pinion gear 26 rotatably mounted on the
And each of the racks 16 and 2 is provided with the pinion gear 26.
The counterweight 8 is moved in synchronism with the movement of the coating unit 6 by engaging with the 3rd gear. That is, when the coating unit 6 moves to the left, for example, the counterweight 8 moves to the right by the same stroke by the action of the pinion rack.

The operation of the coating reciprocator constructed as described above will be described below. First, the vehicle body W is carried in below the elevating beam 2, the height of the coating unit 6 is adjusted by the elevating drive source 3, and then base coating is started while spraying paint from the coating gun 5.

That is, the body W is gradually advanced in the vehicle length direction while the coating unit 6 is reciprocated in the vehicle width direction by the servomotor 7, but the coating unit 6 is countered on the guide rail 4 sliding in the vehicle width direction. Weight 8 is provided,
Moreover, since the counterweight 8 moves in the opposite direction by the synchronization mechanism 10 in accordance with the movement of the coating unit, the inertial force of the coating unit 6 is canceled.

Therefore, vibrations when the coating unit 6 changes direction are also suppressed, and problems such as uneven coating and uneven coating due to the shake of the coating gun 5 are eliminated.

At this time, since the counterweight 8 has substantially the same weight as the coating unit 6, the inertial force can be effectively canceled by moving the counterweight 8 with the same stroke as the coating unit 6. The synchronization mechanism 10 can be a simple control mechanism such as a pinion gear.

In the embodiment, as can be seen from FIG. 4, the center of gravity of the counterweight 8 and the center of gravity of the coating unit 6 are deviated in the vehicle length direction, which causes a moment to be generated in the same direction. , This moment has little influence on the vibration, so there is no need to worry about it. Also,
Similarly, when this positional deviation occurs in the height direction, it is not necessary to pay much attention to it.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the drawing, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, a dedicated drive source is provided as drive control means for moving the counterweight 8 in the direction opposite to the coating unit 6.

That is, a dedicated servo motor 31 is provided below the beam 2 on the opposite side of the servo motor 7 for driving the coating unit 6.
A crank rod 34 is attached to the tip of an output shaft 33 connected to the servo motor 31 via a speed reducer 32, and a connecting bar 35 is linked between the crank rod 34 and the counterweight 8. The counterweight 8 is slidably engaged with the guide rail 4 as in the above example.

In this case, the servomotor 31 drives and controls the counterweight 8 so as to move it in the opposite direction. However, even if the weight of the counterweight 8 is different from the weight of the coating unit 6, for example, the length of the crank rod 34 is increased. Is adjusted, or the drive timing of the servo motor 31 is adjusted to achieve a good balance.

That is, since the inertial force can be expressed by weight × acceleration, for example, when it is desired to reduce the weight of the counterweight 8, the acceleration of the counterweight 8 can be increased by increasing the length of the crank rod 34 and increasing the reciprocating speed. Go up and be balanced. Incidentally, the movement stroke at this time becomes long. On the contrary, when the weight of the counterweight 8 is increased, the crank rod 34 may be shortened to reduce the reciprocating speed.

Next, the third embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. In this figure, the same parts as those described above are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the servomotor 7 for driving the coating unit 6 is utilized as the drive control means for the counterweight 8, and the coating unit 6 and the counterweight 8 are used.
Both of the reciprocating motions are combined by one servo motor 7. Therefore, another crank rod 41 is provided in the middle of the output shaft 18, and the tip end of the crank rod 41 and the counter weight 8 are linked by a connecting bar 42.

The crank rod 19 connected to the coating unit 6 side and the crank rod 41 connected to the counter weight 8 side are in the same direction, and the crank rods 19 and 41 and the connecting bars 20 and 42 are connected to each other. The pivot point is located symmetrically with respect to the center of the output shaft 18 so that the coating unit 6 and the counterweight 8 move in the opposite directions in synchronization with each other.

Also in this case, the counterweight 8 is adapted to slide along the guide rail 4.
In the case of this embodiment as well, the weight of the counterweight 8 can be arbitrarily set by changing the length of the crank rod 41 connected to the counterweight 8 side.

[0037]

As described above, in the coating reciprocator of the present invention, the weight member is reciprocated in the opposite direction in synchronization with the reciprocating movement of the coating unit. Although the coating gun shook every time the direction of movement changed due to the force, the effect of canceling the inertial force is exerted in this case, and the sway of the coating gun can be eliminated. That is, since it is not necessary to set the direction change point outside the vehicle width as in the conventional case, it is possible to improve the coating quality without lowering the coating efficiency and without wasting the coating material. Further, by making the weight of the weight member substantially the same as that of the coating unit and the moving stroke of the weight member substantially the same as that of the coating unit, complicated control is unnecessary and inexpensive equipment can be easily configured.

[Brief description of drawings]

FIG. 1 is a front view of a coating apparatus to which a coating reciprocator according to the present invention is applied.

[Fig. 2] Side view of the coating device

FIG. 3 is a front view of a coating reciprocator according to the present invention.

FIG. 4 is a plan view of the reciprocator.

5 is an enlarged view of a main part of FIG.

FIG. 6 is a side view of the reciprocator.

FIG. 7 is a front view of the reciprocator according to the second embodiment.

FIG. 8 is a plan view of the reciprocator.

FIG. 9 is a front view of a reciprocator according to a third embodiment.

FIG. 10 is a plan view of the reciprocator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Prop, 2 ... Elevating beam, 3 ... Elevating drive source, 4 ... Guide rail, 5 ... Painting gun, 6 ... Painting unit, 7 ... Servo motor, 8 ... Counter weight, 10 ... Synchronous mechanism.

Claims (2)

[Claims] 1. A coating reciprocator in which a coating unit equipped with a coating gun is horizontally reciprocally movable along a guide member, wherein the guide member is horizontally moved in synchronization with the movement of the coating unit. A coating reciprocator, comprising a movable weight member, and drive control means for reciprocating the weight member in a direction opposite to the moving direction of the coating unit. 2. The coating reciprocator according to claim 1, wherein the weight member has substantially the same weight as the coating unit and reciprocates with a stroke substantially the same as a moving stroke of the coating unit. Reciprocator for painting.