JPS6224145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic coating device for applying a coating agent such as a sealant or adhesive to a predetermined location on an object to be coated. In the automobile manufacturing process, for example, a method for attaching front and rear window glasses to the car body is to apply a sealant such as butyl rubber around the window glass and fix it to the car body. With the automation of this coating work, an automatic coating device has been developed as a dedicated machine for this purpose, and the applicant has already proposed various types. According to the specification and drawings of Utility Application No. 55-40324 proposed by this applicant, as shown in FIG. A master model 1 having a similar external shape and rotatably supported on a shaft bearing 3; a drive device 2 that engages with the master model 1 and drives it to rotate; and a drive device 2 that engages with the master model 1 to rotate it; a guide device 4 that guides and moves the drive device 2 with respect to the shaft bearing portion 3 below;
It is composed of a coating machine 6 that moves together with a drive device 2 and is equipped with a nozzle 5 that sprays a sealant at the bottom.
When applying the sealant to the object to be coated 1a, the master model 1 is rotated by the drive device 2, and the drive device 2 is brought into engagement with the master model 1 in response to the rotational displacement of the master model 1. This is accomplished by guiding the sealing agent relative to the bearing 3 and jetting the sealant from the nozzle 5 of the applicator 6 toward the object 1a. However, in such a conventional apparatus, the object to be coated 1a
The master model 1 on which the coating is placed is formed to have an external shape similar to that of the object to be coated 1a, and a rack or chain 8 that engages with the sprocket 7 rotated by the drive device 2 is provided on the outer peripheral surface of the master model 1. There is a drawback that it is not possible to automatically apply a coating agent to an irregularly shaped object, and if the shape and dimensions of the object to be applied 1a are changed due to a model change or remodeling, it is no longer possible to apply the coating agent to the object with the above-mentioned configuration. The coating operation cannot be performed using Model 1, and a new master model must be manufactured or the equipment must be significantly modified, so there is a problem in that it is not possible to promptly respond to changes in the model of the object to be coated. The present invention has been made by focusing on these conventional drawbacks and problems, and by making the object to be coated itself function in place of the conventional master model, it simplifies the structure of the device and can be applied to a wide variety of shapes. It is possible to automatically apply the coating agent to the target object,
A further object of the present invention is to provide an automatic coating device that can quickly respond to model changes of objects to be coated. An embodiment of the present invention will be described below with reference to the drawings shown in FIGS. 2 to 8. In this embodiment, the object to be coated 9
a turntable 10 which is positioned and rotatably supported; a drive device 11 which rotationally drives the turntable 10 ; A tracking device 14 mounted with a nozzle 13 that follows the movement of the peripheral edge and is directed inward of the outer peripheral edge, and detects the peripheral speed of the outer peripheral edge of the object to be coated 9 at the contact position,
The circumferential speed detecting device 12 outputs a signal proportional to the deviation between the circumferential speed and a preset circumferential speed to the drive device. That is, the turntable 10 is made of, for example, a rectangular plate, and a plurality of fixtures 15, such as vacuum cups, for fixing it to the object 9 to be coated are provided on its upper surface 10a. This fixing tool 15 is not limited to a vacuum cup as in this example, but the present invention is applicable to flat objects to be coated as well as
Since it is possible to coat objects having a tapered surface that changes in the vertical direction, a curved surface, and even objects having a curved coating area, it is desirable to have a coating that can quickly adapt to these shapes. Reference numeral 16 (Fig. 3) denotes a rotation shaft disposed at the center of rotation of the turntable 10 , which is rotatably supported by a column 18 erected on a base 17, and which supports a sprocket 20 fixed to a boss 19. The power of the drive device 11 is transmitted through the drive device 11. The drive device 11 is mounted on a base 17 with a support bracket 2.
The servo motor 22 includes a servo motor 22, a sprocket, a chain, etc., which are attached through the servo motor 1, and the rotation speed of the servo motor 22 is variable according to an output signal from a circumferential speed detection device 12, which will be described later. The object to be coated 9 is rotated via a sprocket 24 fixed to the shaft 23 and a chain 25 wound around the sprocket 20.
As will be described later, the circumferential speed of the object 9 to be coated in the coating area is maintained constant. That is, the circumferential speed detection device 12 includes, for example, a rotary tube 27 that rotates together with a roller shaft 37 (described later) and has windows at equal pitches on its circumferential surface, and a fixed light source disposed inside the rotary tube 27. , and a photoconductor 28 that emits a pulse signal each time light from the fixed light source passes through the window. Reference numeral 26 denotes a controller, which includes a counting circuit that counts the pulse signal, and a proportional adjustment circuit that compares the counted number with a set count number corresponding to a preset circumferential speed and transmits a deviation signal proportional to this deviation. In this case, the servo motor 22 is, for example, a condenser motor that receives the deviation signal and adjusts the rotation speed so as to make the deviation zero. The following device 14 has two pairs of support frames 29 erected on the base 17 as shown in FIG.
A guide rod 30 is slidably provided on the upper part of the support frame 29 via a bearing, and one of the support frames 29, 29 which are installed one after another among the support frames 29
A connecting piece 31 is fixed between them, and one end of a cylinder 32 that operates in accordance with the rotation of the object 9 to be coated is fixed to this connecting piece 31. 33 is a connecting plate fixed between the respective ends of the guide rods 30, 30, and the operating rod 34 of the cylinder 32 is located in the center of the connecting plate.
One end of the guide rod 30 is fixed, and the reciprocating movement of the operating rod 34 allows the guide rod 30 to reciprocate via the connecting plate 33. A bearing 36 that rotatably supports a center pin 35 is provided upright at the center of the upper surface of the connecting plate 33, and a bracket 60 having a U-shaped cross section is attached to the boss portion 6 of the center pin 35.
It is fixed via 1. The upper piece 62 and the lower piece 6 of the bracket 60 face each other.
Roller shafts 37, 37 (sixth
) are rotatably supported, and these roller shafts 37 have circumferential grooves 3 in contact with the outer peripheral edge of the object to be coated 9.
A guide roller 38 having a shape 8a (FIG. 4) is mounted so as to be rotatable in synchronization with the roller shaft 37. That is, the guide roller 38 is mounted so as to be movable up and down in the axial direction of the roller shaft 37 via, for example, a sliding key, and is normally attached to the guide roller 3.
8 and the upper piece 62 and the lower piece 64, the roller shaft 3 is
7, and is movable up and down while maintaining a balanced state by the elastic force of a spring 39 while in contact with the circumferential groove 38a, following the up and down displacement of the outer periphery of the object to be coated 9. ing. 40 are the upper piece 62 and the lower piece 6 of the bracket 60
A vertical guide 41 that is movable along the groove is loosely inserted into the guide groove 40, and is located at a vertical position approximately in the center of the vertical guide 41. Roller holders 42 and 43 are attached, and the roller holder 42 disposed on the upper side carries the coating agent from the coating machine main body (not shown) to the coating area of the object 9 through the flexible tube 13a. A jetting nozzle 13 is attached, and springs 44, 44 are inserted between the roller holders 42, 43 and the corresponding upper piece 62 and lower piece 64 of the bracket 60, respectively, to make the vertical guide 41 elastic. I support it. 45 is a nozzle roller rotatably supported between roller holders 42 and 43, and its circumferential groove 45
As shown in FIG. 7, the roller a is configured to come into contact with the periphery of the object to be coated 9 together with the guide roller 38. That is, on the upper surface of the upper piece 62 and the lower surface of the lower piece 64 of the bracket 60, as shown in FIGS. 6 and 7, a horizontally long guide rail 47 having a U-shaped cross section is provided.
rollers 46, 46' of trolleys 47, 47' are rotatably engaged with guide rails 47a, 47'a, and cross sections of trolleys 47, 47' are provided. The members 48, 48' are provided with a pair of vertical rollers 49, 49' that guide the vertical guide 41 in a vertically slidable manner.
is rotatably attached. These cross members 48, 48' and the bracket 60
A spring 50 is loaded between the boss portion 61 and the trolley 47, 4 due to its elastic force.
7', vertical rollers 49, 49' and vertical guide 4
1, the nozzle roller 45 is urged to the left in FIG. For example, the nozzle roller 45 retreats to the right in the figure against the elastic force of the spring 50, and for example, it retreats to the right for an application area having a vertically curved or tapered surface. while moving up and down together with the vertical guide 41,
It is configured to follow along the outer periphery of the object 9 to be coated. Therefore, the coating device of the present invention can be applied to a coating material that is displaceable in the horizontal and vertical directions. The automatic coating device of the present invention configured as described above operates as follows. The object to be coated 9 is placed on a turntable.
10 , and then move the operating rod 34 of the cylinder 32 forward to move the bracket 60 toward the outer periphery of the object 9 to be coated. After pressing the circumferential grooves 38a, 45a against the outer circumferential edge of the object to be coated 9, the circumferential speed detection device 12 and the applicator main body are operated, and the servo motor 22 is driven to move the turntable 10 in the direction of the upper arrow in FIG. When the object 9 to be coated is rotated, the nozzle 1
As shown in FIG. 8, the coating material discharged from the coating material 3 is applied onto the coating line A set at a certain inner position from the periphery of the upper surface of the object 9 to be coated. In this case, the actual coating area is an area a that includes the coating line A and has a width of the discharge pattern of the coating material discharged from the nozzle 13 .
It consists of: For example, when the object 9 to be coated, which has a rectangular planar shape, rotates from _position to position _{in FIG} . constitutes the application line A. That is, when the object 9 to be coated rotates in the direction of the arrow and moves from position to position, the guide roller 38 and nozzle roller 45 of the follower 14 contact the outer periphery of the object 9 to be coated and follow the movement of the outer periphery. . Furthermore, when the object 9 to be coated rotates and moves from position to position, the application point changes from P ₂ to P ₃
Since it moves to a certain position, this movement locus constitutes the application line A. At this time, the coating line is slightly deviated inward as shown in section A' in the figure, but the amount of deviation is determined by taking into account the curvature of the outer periphery of the object to be coated 9.
In addition to reducing the span between the guide rollers 3
8. The nozzle roller 45 and the bracket 60 are made smaller as a whole, and the vertical guide 41 to which the nozzle roller 45 is fixed is guided via the trolleys 47 and 47' according to the rotation of the object 9 from the above-mentioned position. By receding along the groove 40 to the right in FIG. 7, it can be limited within the permissible range. As a result, even when the radius of curvature of the outer circumference of the object to be coated 9 is quite small, such as the corner of the object to be coated 9 shown in FIG. Because of the pressure contact, the distance between the nozzle 13 and the outer periphery of the object to be coated can be maintained within a certain range. Therefore, even if the object to be coated has a curved outer circumferential portion with a fairly small radius of curvature, uniform coating can be performed on the coating area along the outer periphery, and even if the object to be coated 9 is curved in the vertical direction If the nozzle roller 45 has an outer periphery that Work is also possible. Furthermore, in the coating apparatus of the present invention, in order to uniformly apply the coating agent to the object to be coated, the peripheral speed of the object to be coated 9 in the coating area is always maintained constant. In other words, in a horizontally long rectangular object as shown in Figure 8, the circumferential speed at the corners is the fastest and the circumferential speed at the center of the long side is the slowest, and variations in these circumferential speeds cause the coating agent to Since the applied amount varies, the circumferential speed of the object to be coated 9 in the applied area is kept constant, and the applied amount of the coating material per unit length in the applied area is made uniform. That is, the driving force of the servo motor 22 is transmitted to the rotating shaft 16 via the drive shaft 23, sprocket 24, chain 25, and sprocket 20, rotates the object 9 to be coated via the turntable 10 , and rotates the outer circumference of the object 9. The rotating tube 27 is rotated via the roller shaft 37 by frictionally rotating the guide roller 38 which is pressed against the roller shaft 37. As the rotating barrel 27 rotates, sensing light emitted from a fixed light source built into the rotating barrel is projected onto the controller 26 through an opening on the outer periphery of the rotating barrel, and the blinking of this projected light is controlled by the controller 26.
6 counts, and sends a signal proportional to the deviation between this count number and a set count number corresponding to a preset specified circumferential speed from the photoconductor 28 to the servo motor 22 to control the rotation speed of the servo motor 22. By doing so, the peripheral speed of the object to be coated 9 is maintained at a specified value. That is, the optimum amount of coating agent to be applied per unit length to the object to be coated 9 is set in advance, and the peripheral speed of the outer periphery of the object to be applied 9 corresponding to this set amount of application is set at the above-mentioned contact position. Covered object 9
By sending a signal proportional to the deviation between the actual circumferential speed and the set circumferential speed to the servo motor 22, the circumferential speed of the object 9 to be coated can always be kept within a certain range, so that the coating material can be applied uniformly. It is possible. Note that in this embodiment, one roller shaft 3
7 is provided with a rotating cylinder 27 and rotated synchronously,
Not limited to this example, if the rotary cylinder 27 is also provided on the axis of the other roller shaft 37 or nozzle roller 45 and linked to the photoconductor as in the above-mentioned configuration, one guide roller 38 can be coated. When the guide roller 38 is evacuated from the outer circumference of the body 9, a signal can be sent by the rotary tube 27 rotating in synchronization with the other guide roller 38 instead of the guide roller 38, thereby preventing interruption of the signal in the abnormal situation. becomes possible. Further, in the above-mentioned embodiment, the single turntable 10 is rotationally driven by the rotating shaft 16, but this is not the only example . If it is configured to be supplied as a driving source and can perform coating work on a plurality of objects 9 to be coated at the same time, mass production can be further promoted, especially when a large number of objects 9 to be coated are left and right symmetrical. It is suitable for coating work on automobile parts. As described above, the present invention eliminates the need for the conventional master model and applies the coating agent along the shape of the object to be coated, so there is no need to modify the equipment when changing the model of the object to be coated. The present invention has the advantage that it can quickly respond to a mass production system for applying coating agents, and that automatic coating operations can be performed using the same device on various types of objects to be coated that have irregular shapes. Furthermore, since the present invention is configured so that the coating agent can be applied by following the rotation of the object to be coated, the coating agent can be applied to objects having various shapes, and the coating agent can be applied to objects having various shapes. can be widely secured. Moreover, in the present invention, since the coating agent is applied by controlling the circumferential speed in the coating area of the object to be coated to a constant value, it is possible to set the coating amount of the coating agent per unit length in the coating area to be constant. This has the effect of ensuring uniform quality of coating work.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Fig. 2 is a plan view showing an enlarged main part of an embodiment of the present invention, and Fig. 3 is an enlarged view showing a drive device of an embodiment of the present invention. 4 is an enlarged front view of a follow-up device according to an embodiment of the present invention, FIG. 5 is a perspective view of the follow-up device shown in FIG. 4, and FIG. 6 is a follow-up device shown in FIG. 4. 7 is a partial sectional view taken along the line A-A' in FIG. 6, and FIG. 8 is an explanatory view of the operation of the present invention. 9...Object to be coated, 10 ...Turntable, 1
1... Drive device, 12 ... Peripheral speed detection device, 13
... Nozzle, 14 ... Follower, 22 ... Servo motor, 26 ... Controller.

Claims (1)

[Claims] 1. A turntable on which an object to be coated can be placed and which is rotatably supported, a drive device that rotationally drives this turntable, and a turntable that rotates the turntable while being in contact with the outer periphery of the object to be coated placed on the turntable. a tracking device that follows the movement of the outer periphery as the turntable rotates; a coating agent discharging nozzle that moves in conjunction with the tracking device and directing toward the inside of the outer periphery; and a coating agent discharging nozzle in the vicinity of the coating agent discharging nozzle. A circumferential speed detection device that detects the actual circumferential speed of the object to be coated, and a controller that controls the drive device so that the actual circumferential speed becomes a preset value based on a signal from the circumferential speed detection device. An automatic coating device characterized by: