JPS6216204Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a drive device for a spray gun in a variable stroke automatic painting machine, which reduces the impact when the spray gun is moved back and forth, improves the uniform movement of the spray gun, and improves the spray gun's ability to move at a constant speed. This idea was designed to improve the efficiency and uniformity of work, as well as increase the durability of the equipment.

In a variable stroke automatic painting machine, a spray gun is fixed to one end of a chain mounted on a pair of sprockets, and the spray gun is moved back and forth by rotating the chain forward and backward.
It is essential for the spray gun to move at a constant speed from the starting end to the ending end in order to avoid waste of paint and obtain a good painted surface. Conventionally, as shown in Fig. 4, the drive system for this type of automatic painting machine is such that both ends of a chain B to which a spray gun A is attached are fixed to an air cylinder C, and the air cylinder C is alternately pulled and pulled. As shown in Fig. 5, the spray gun is operated by directly connecting the driving force of an air motor or electric DC motor D that rotates forward and backward alternately to the drive shaft E of the sprocket. Generally used. However, as shown in Figure 6, this type of automatic painting machine has the characteristic that even if the operating direction of the air cylinder etc. is changed, the moving direction of the spray gun does not suddenly reverse due to the action of penetration. Since there is no uniformity in the movement of the paint, painting can only be done in the middle of the stroke where the speed is relatively constant, and the paint and time corresponding to the shaded area in Figure 6 are wasted. There is. If a hydraulic cylinder or a hydraulic motor is used in place of the air cylinder, air motor, or electric motor described above, the direction of movement of the spray gun can be changed instantaneously as shown in Figure 7, improving uniformity of velocity. The disadvantage is that the spray gun receives a large impact and generates intense noise and vibration, which impairs the durability of each part of the device, and requires special and expensive shock mitigation measures. In addition, the use of hydraulic equipment has the disadvantage that the equipment is large-scale and expensive, such as requiring a large-capacity oil tank and an oil cooler to keep the oil temperature constant.

This proposal was devised in view of the above, and
The driving force of the motor rotating at a constant speed in a fixed direction is input to the reducer, two outputs with opposite rotational directions are taken out from the two output shafts of the reducer, and these two outputs are sent together to the intermediate shaft equipped with an air clutch. The intermediate shaft is configured to rapidly change its direction of rotation by transmitting power and switching the air clutch, and the driving force of the intermediate shaft is transmitted to the drive shaft of the sprocket using a comparatively long V-belt. However, as shown in Fig. 8, the uniform velocity of the spray gun is good and the impact is reduced by reducing the impact applied to the chain and spray gun by the appropriate elasticity of the V-belt and the sliding action of the friction plate of the air clutch. This is an attempt to construct an automatic coating machine with a small amount of paint.

Next, an embodiment of the present invention will be described based on the drawings.

1 is a gun arm, sprocket 2,
The rollers 4, 4 fixed to the front side of the chain 3 mounted at
It is attached to guide rails 6, 6 which are erected, and moves up and down on the guide rails as the chain 3 rotates forward or backward. 7 is chain 3
Shows a balance weight fixed to the rear side of. 8,
A spray gun 8' is connected to a paint and air system (not shown) and is installed at both ends of the gun arm 1. 9 is an attacker for operating a limit switch, and is fixed to a chain 11 mounted on sprockets 10 and 10'.
1 is linked to the chain 3 by a chain 12 mounted on sprockets 30 and 31 provided coaxially with the sprockets 2 and 10, respectively, so that the attacker 9 moves synchronously with the spray guns 8 and 8. ing. 13 is an air limit switch for regulating the upper end, and 14 is an air limit switch for regulating the lower end, each of which is set at a predetermined position on the machine frame 5 to face the attacker 9. 15
16 is a motor, and 16 is a reducer, which transmits the driving force of the motor 15 to the reducer 1 via a transmission 17.
6, and two outputs which rotate in opposite directions are taken out from the two output shafts of the reducer 16. As the motor 15, any driving shaft such as an air motor or a hydraulic motor can be used in addition to an electric motor. 18 is an intermediate shaft on which two pulleys 20, 20' are set via air clutches 19, 19' for forward rotation and reverse rotation;
20', the two outputs of the reducer 16 are transmitted through V-belts 21 and 21', respectively. Reference numeral 22 is a V-belt having appropriate length and elasticity, and is mounted on the intermediate shaft 18 and the drive shaft 23 of the sprocket 2, so that forward or reverse rotation of the intermediate shaft 18 is transmitted to the sprocket. Air clutches 19, 19' set on the intermediate shaft 18 are connected to the limit switches 13, 14 for upper limit regulation and lower limit regulation using air circuits as shown in FIG. When the attacker 9 descends and comes into contact with the limit switch 14 for lower limit regulation, the air master valve 24 switches to open the air clutch 19 for forward rotation and at the same time open the air clutch 1 for reverse rotation.
9' is tightened to the intermediate shaft 18, the intermediate shaft 18 is reversed, the sprocket 2 is reversed via the V-belt 22, and the spray gun is raised. Subsequently, when the spray guns 8, 8' rise and the attacker 9 comes into contact with the limit switch 13 for regulating the upper limit, the air master valve 24 switches again to release the air clutch 19' for reverse rotation, and at the same time, the air clutch 19 for forward rotation is moved to the intermediate shaft 18. The intermediate shaft 18 is rotated in the forward direction, and the spray gun 8 is connected via the V-belt 22.
8' is lowered again. The device of the present invention repeats the above-mentioned operations in order to perform continuous painting. Here, the limit switches 13 and 14 are the spray guns 8 and 8'.
shall be moved and set appropriately according to the moving distance. Further, although the above embodiment is an example in which pneumatic limit switches and clutches are used, it is of course possible to implement the same method even if the limit switches and clutches are electric ones. In this case, it is desirable to use an explosion-proof type.

The drive device for the spray gun in the automatic painting machine of this invention extracts the driving force of the motor 15 rotating at a constant speed in a certain direction as two outputs that rotate in opposite directions through the reducer 16, and simultaneously sends these outputs to the intermediate shaft 18. Since the intermediate shaft 18 is configured to rotate forward or reverse by switching the air clutches 19, 19' set on the intermediate shaft 18, it can be used in devices using conventional air cylinders, air motors, or electric DC motors. Compared to this, the rotation direction is quickly switched, and the spray gun 8,
Since the movement of 8' is excellent in uniform speed, a uniform and excellent coating surface can be obtained, and there is little wastage of paint, and work efficiency is greatly improved. Furthermore, since the rotation of the intermediate shaft 18 is transmitted to the drive shaft of the sprocket 2 via the relatively long V-belt 22, the elasticity of the V-belt 22 and the air clutches 19, 19' are improved.
The impact caused by switching the rotational direction of the intermediate shaft 18 is appropriately absorbed by the sliding of the friction plate, and as no excessive load is applied to the chain 3 or spray guns 8, 8', vibration and noise are suppressed. Improves durability. In this case, compared to conventional devices using hydraulic motors or hydraulic cylinders, there is no need to provide a special and expensive shock absorbing device, so it can be implemented at low cost, and has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the overall configuration of the proposed device;
Figure 2 is a perspective view showing the configuration of each part of the device, Figure 3 is a circuit diagram showing the air circuit that operates the air clutch,
Fig. 4 is a front view showing a conventional drive device, Fig. 5 is a front view of the same, Figs. 6 and 7 are speed diagrams showing the operation of the spray gun of the conventional device, and Fig. 8 is a spray gun of the present device. FIG. 3 is a velocity diagram showing the operation of the gun. 1...Gun arm, 2, 2'...Sprocket, 3...Chain, 4...Roller, 5...Machine frame, 6...Guide rail, 7...Balance weight, 8, 8'...Spray gun, 9...Attack car, 10,10'...Sprocket, 11...Chain, 12...Chain, 13,14...Limit switch, 15...Motor, 16...Reducer, 17...Transmission, 18... Intermediate shaft, 19,1
9'...Air clutch, 20, 20'...Pulley, 21, 21'...V-belt, 22...V-
Belt, 23... Drive shaft, 24... Air master valve, 30, 31... Sprocket.

Claims (1)

[Scope of utility model registration request] In a variable stroke automatic painting machine, a spray gun is fixed to one end of a chain mounted on a pair of sprockets, and the spray gun is moved back and forth as desired by rotating the chain forward or backward. The two outputs rotating in opposite directions are taken out from the two output shafts of the reducer 16, and these outputs are transmitted to the intermediate shaft 18 provided with an air clutch using any transmission means, and the air clutch is switched. Therefore, the driving force of the intermediate shaft 18, which rotates forward or reverse as appropriate, is transferred to the drive shaft 23 of the sprocket for driving the spray gun by the V-belt 22.
A spray gun drive device for a variable stroke automatic painting machine, which is characterized by a transmission of power to the spray gun.