JPS6147145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating method for automatically, continuously and efficiently coating hooks of complex shapes and relatively small coating areas, such as frames of motorcycles.

When painting a motorcycle frame automatically and continuously, conventionally the frame is suspended and supported using a hanger conveyor, transported into a painting booth, transferred without changing its position, and then painted with a paint gun, etc. is going on. By the way, the frame of a motorcycle is made up of joined pieces of small-diameter pipe material, and it is difficult for the paint to reach the corners of the pipe joints sufficiently.Therefore, correction painting has to be done by hand, and it is difficult to apply paint to the corners where the pipes are joined. It is not preferable to carry out this work, and in addition to this problem, since manual work is also used, efficient painting cannot be performed. In addition, the conveyor line is loaded, painted,
Since the conveyor speed is continuous with the delivery process, the speed of the conveyor has to match the painting process. Therefore, it is necessary to arrange an extremely large number of hangers on the conveyance path to maintain productivity, making it completely unmanned. There are disadvantages such as difficulty and high equipment costs.

In order to achieve the above-mentioned unmanned operation and automation, it is possible to combine a painting gun and a robot, as in the case of car body painting, but this would complicate the painting equipment and painting line, and the equipment cost would be extremely high, which is disadvantageous. .

The present invention has been made in order to improve the above-mentioned inconveniences in the consistent and continuous painting of motorcycle frames, etc., and its purpose is to eliminate the need for manual correction work and to automatically and continuously paint the frames of motorcycles. ,
In addition to efficiently painting, the above is planned to be cost-effective with a simple line configuration, and workpieces can be loaded and unloaded quickly using the minimum number of trolleys.
It is an object of the present invention to provide a coating method capable of reducing process time other than painting, improving productivity of two-wheeled vehicles, etc.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is an explanatory view of the line plane of the painting process, where the line 1 is equipped with a tunnel-shaped painting booth 2, and adjacently equipped with a high-speed conveyor 3 that escapes to the side before and after the entrance 2a and exit 2b of the booth 2. . The floor 2c of the booth 2 is equipped with a groove-shaped trolley transfer rail 4 that connects the entrance and exit in the length direction, and the rail 4 is connected to the exit 2.
b, is extended to the tip of the booth, is bent to one side, is provided parallel to one side of the booth in the front-rear direction, is bent in the direction of the booth from this side of the entrance 2a, and is further bent in the direction of the entrance 2a. It is bent, passes through the inside of the booth 2, and is formed into a loop shape. The conveyor 3 is installed below the floor 2c of the booth, bends to one side from upstream of the entrance 2a of the booth 2, runs along the side of the booth parallel to the rail 4, and approaches this part of the rail at the end of the exit 2b. , the other part runs adjacent to and parallel to the rail 4 and forms a loop. Then, under the floor on the downstream side from the intermediate part of the booth 2, a low-speed conveyor 5 that bends before the high-speed conveyor 3 at the end of the exit 2b and merges into the intermediate part from the side of the booth is partially parallel to the rail 4 inside the booth. The conveyor 5 is on the same line as the front and rear portions of the booth entrance and exit of the conveyor 3.

Upstream of the entrance 2a of the booth 2, a workpiece loading station A is provided in parallel with the rail 4 and the high-speed conveyor 3, and a workpiece unloading station B is provided further upstream of this. In the embodiment, the workpiece W is a frame of a motorcycle as shown in FIGS. 4 to 6, and is held by a trolley 30. The trolley 30 is as shown in FIGS. 2, 7 to 9, and has four wheels 32 under a base frame 31, and engages with conveyors 3 and 5 that move up and down via links 33 at the front. A pin 34, an arm 35 at the rear that abuts against the link 34 of the rear vehicle to move it upward, and a pin 36 that engages with the rail 4 are provided. A rotating shaft 37 is installed on the center of the base frame 31, and a workpiece holding seat 38 is provided at the upper end of the rotating shaft 37, and four recesses 3 are provided at equal angular intervals in the middle.
A regulating disk 39 is provided, and the disk 3
9, the pin 41a of the regulating arm 41 biased by the spring 40 engages with one of the recesses 39a, and rotation is regulated, as shown in FIG. Further, a rectangular regulating portion 44 is provided around the top of this. A one-way engaging portion 42 that engages with a part of the truck 30 in the pulling direction and releases the engagement in the pushing direction is connected to the cylinder 6.
A workpiece W such as a frame is set on the trolley 30 at the loading station A as shown in FIG. 3 is engaged with the pin 34 and transferred to the entrance 2a of the booth 2 at high speed, and the link 33 of the truck 30 abuts against the arm of the front vehicle to raise it, remove the pin 34 from the conveyor 3, and transfer the truck 30 to the entrance 2a of the booth 2 at high speed. Separate from. The conveyor 3 branches from point a, avoids the inlet 2a, and moves downstream. After the previous truck has been transferred into the booth, the truck 30 is transferred into the booth. This is because a transfer cylinder 6 as shown in FIG.
The carriage 30 is intermittently transferred into the booth by a predetermined stroke via the one-way engaging part 42 connected to this at point a, and the pin 34 simply slides on the floor surface.

In the embodiment, three coating areas C, D, and E are provided in the length direction of the line upstream of the booth 2 near the entrance 2a. Each painting area C, D, E has a first
A coating machine 50 as shown in Figs. By moving W ₁ , W ₂ , W ₃ , and W ₄ diagonally upward, the lower part of one side of the workpiece W
Paint W ₅ , W ₆ , W ₇ , and W ₈ , that is, paint the parts that are difficult to paint when painting the entire area. Depending on the layout and number of painting guns, W ₁ , W ₂ , W ₅ , and W ₆ may be painted in a reciprocating process, and W ₃ , W ₄ , W ₇ , and W ₈ may be painted in one-pitch workpieces and transferred to the next one. It is also possible to paint in a reciprocating process.

The cylinder 6 sends the truck from this painting area C to the next painting area D, and the workpiece W is rotated 90 degrees in the painting area D. This is done by the rotation of the rotating shaft 37 of the truck 30, and the workpiece is rotated by the vertical movement of the paint sprayer. Flip W part W ₉ in the opposite direction and paint W ₁₀ on the opposite side. Alternatively, the workpiece W may be transferred in one pitch and coated with _W10 .

Furthermore, the trolley 30 is sent to the painting area E, where the workpiece W mentioned above is rotated by 180 degrees, and the workpiece W is rotated in the same manner as C.
Move the painting gun diagonally up and down against the area W ₁₁ , W ₁₂ , W ₁₃ , W ₁₄ and W ₁₅ , on the opposite side to the above.
Paint W ₁₆ , W ₁₇ , and W ₁₈ . In this way, areas that are difficult to paint and that have conventionally been done manually can be painted automatically by rotating the workpiece W or the cart 30 in each painting area, changing the posture, and moving the painting gun diagonally without requiring manual work. Paint is applied sequentially.

The change in the posture of the workpiece is as shown in detail in FIGS.
is pulled, the outer end of the regulation arm 41 mentioned above comes into contact with the cam 8 provided on the machine frame 7 of each painting area, the arm 41 swings, and the pin 41a engages with the recess 39a of the regulation disc 39. When released, any one of the four guide arms 43 provided radially on the disc 39 is placed on the machine frame 7.
The shaft 37 rotates, while the cam 8 and the regulating arm 41 are disengaged, and the pin 41a rolls on the outer periphery of the disk 39 under the action of the spring 40, causing the pin 41a to roll around the outer periphery of the disc 39 and move into the recess in the rotational direction. The rotation of the disk 39 is restricted. In this way, the rotating shaft 37 rotates, the workpiece W changes its posture, and the above operations are performed for each painting area by the same mechanism. In addition, pin 3 of trolley 30 is attached to each painting area.
A position holding clamp means 10 is provided to hold the rotating shaft 37 at each painting position, and this clamp means 10 is opened and closed by the cylinder 12 of the link mechanism 11. A clamping means 13 is provided, and its left and right clamp arms 14 are opened and closed by a link 16 driven by a cylinder 15. In this way, the posture is changed, this posture is maintained, and the workpiece W, that is, the cart 30 is held at that position.

Alternatively, the posture of the workpiece W may be changed by rotating the cart 30.

The coating machine 50 is as shown in FIG. 10 and FIG.
While moving up and down with the sprocket mechanism 54,
The holding body 53 is provided with a holding plate 56 guided by another diagonal rail 55, and the holding plate 56 moves up and down together with the vertical movement of the holding body, and also moves left and right on the rail 55 as shown in FIG. 10, thereby holding it. A coating gun 57 attached to a plate 56 is caused to perform two-dimensional diagonal vertical movement.
Any two-dimensional movement can be performed by setting the inclination angle of the rail 55, etc. The coating machine 50 is equipped with a control device 58 such as a photoelectric device, and the coating gun 5
The coating operation No. 7 is controlled so as to be performed only in the portions W ₁ to _{W 18} described above.

The workpiece W, which has been painted as described above after passing through the painting areas C, D, and E, is sent by the cylinder 6 downstream on the trolley 30, that is, to the left in FIG. 30 pins 34 engage this,
The cart 30 is sent downstream at low speed, and the pin 36 engages with the rail 4 on the floor, and is guided by the rail 4 and transported downstream on the conveyor 5. A painting area F is provided downstream of the confluence b of the conveyor 5,
The entire workpiece W moving at a low speed is painted, and parts W ₁ to _{W 18} have already been painted in the previous steps C, D, and E, and the entire workpiece is painted here, and the painting is completed. A drying area G such as an infrared drying oven is provided downstream of this coating area, and the work W after coating is dried while being transported by a trolley on a low-speed conveyor.
This brings us to b.

Ahead of the exit 2b, the low-speed conveyor 5 branches off at a point c, and the bogie, guided by the rail 4 and advanced by inertia, removes the pin 34 from the conveyor 5 with a cam or the like, and returns to the exit 2b.
The pin 34 is engaged at the confluence point d of the high-speed conveyor 3 ahead of the workpiece, and the workpiece is transferred to the high-speed conveyor 3 and carried to the payout station B, where the workpiece is paid out.The empty cart is further carried and a new one is placed at the loading station. The workpiece is set.

Although the embodiments have been described in detail above, the workpiece is arbitrary, the means for changing the posture of the workpiece and the coating machine are arbitrary, and the specific structure of the conveyor and the intermittent feeding mechanism of the trolley may also be arbitrary. can.

As is clear from the above, according to the present invention, a workpiece is carried into a painting booth, and the workpiece that requires manual correction work, such as the frame of a motorcycle, is fully automatically and unmanned without any manual work. It is possible to automate, save labor, and perform efficient painting, and improve the productivity of the painting process. Since it is carried out in combination, the equipment is simple and the above can be achieved at low cost. In addition, by combining high and low speed conveyors, work can be carried out at the necessary speed in the necessary area, and after painting, it can be discharged at high speed, and therefore the next process can be carried out quickly, contributing to improved production efficiency. Since the carriages are returned at high speed, there is no need for carriages along the entire length of the line, and the minimum number of carriages is sufficient, which has many advantages.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory plan view of a painting line, FIG. 2 is a side view of a truck, FIG. 3 is a side view of a truck intermittent feed mechanism, and FIG.
6 to 6 are explanatory diagrams showing changes in the posture of the workpiece,
Figure 7 is an enlarged longitudinal cross-sectional rear view showing a workpiece posture changing device using a trolley, and Figures 8 and 9 are Figures 7-8-8.
10 is a front view of the coating machine, and FIG. 11 is a side view thereof. In the drawing, W is the workpiece, 2 is the painting booth, 2a,
2b is an inlet and an outlet, 3 is a high-speed conveyor, 5 is a low-speed conveyor, 6 is a cylinder into which the carts are input one by one, and C, D, E, and F are painting areas.

Claims (1)

[Claims] 1. Carts that hold workpieces are brought into the painting booth one by one, and while the carts are intermittently transported within the booth, the workpieces are rotated, stopped, and moved to paint difficult-to-paint parts of the workpieces. Then, while moving the trolley at low speed, the entire workpiece is coated and dried, and then moved from the coating booth exit to the workpiece delivery position.
A painting method characterized by transporting a cart via a work set position to a painting booth entrance using high-speed transport means.