JPS582472Y2 - Rotary coating machine - Google Patents

Description

[Detailed description of the invention] This invention automatically coats a magnetic material and a protective film to a thin and uniform thickness on a magnetic disk disk used in external storage devices such as electronic computers, and burns the surface after coating. This relates to the structure of the coating machine.

Conventionally, this type of applicator uses a motor equipped with a continuously variable transmission to rotate the object to be coated, and also has a flow type clean air generator that cleans the environment of the object to be coated. It was installed so that it was on the worker's side, that is, in front of him.

Furthermore, in order to bake the coating liquid applied to the object to be coated, the coating liquid was taken out from the coating machine and placed in a special oven for baking at a temperature of about 200°C.

However, this method had problems with safety, work environment, division of work processes, etc.

First, the coating liquid is flammable because it is a volatile welding material that contains organic substances, and if the motor has a so-called brush structure like a general motor, and the control circuit does not have explosion-proof measures. If sparks were generated by rotating the solution, there was a risk that the solution would catch fire.

Therefore, a drive source with a structure without brushes was required, and a Hall motor or the like could be considered as long as the rotation could be converted, but this had the disadvantage of being expensive because it required a control section.

In addition, if the flow type from the clean air generator is facing the operator, when using a volatile solution containing organic substances, some amount of air will blow out towards the operator when setting and resetting the object to be coated. It has been harmful to the human body.

Furthermore, in order to bake the coating solution onto the surface of the object to be coated after coating, it must be placed in a separate oven for baking, which is separate equipment, and the division of the work process requires workers to move around. Ta.

In addition, there are drawbacks such as the fact that the object to be coated is carried around, which causes dust to adhere, which affects the quality of the product.

Therefore, it is possible to easily and smoothly convert the rotation without using a brush-structured motor as the rotational drive source, and to convert the flow type of the clean air generator into a downflow, and the air flow is layered on the surface of the object to be coated. There was a desire to develop a coating machine that would allow the coating to flow smoothly, and that would also be able to bake the coating in that state once coating was completed.

The object of the present invention is to provide a coating machine that eliminates or improves these drawbacks.

According to the present invention, in order to form a thin film on the surface of a disk-shaped object, after the coating liquid has been dropped onto the surface of the object, the rotation speed is changed to shake off the excess coating liquid and make it uniform. In a rotary coater that produces a coating material with a thickness of A rotary coating machine is equipped with a heat source 4 for baking and a clean air generator 2 with a wire mesh 3 on the front directly above the object to clean the surrounding environment of the object. can get.

Next, one embodiment of the coating machine of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of a coating machine showing an embodiment of the present invention.
Attached to the top of this applicator is a down-flow type clean air generator 2 that cleans the environment of the magnetic disk disk 1 during coating and prevents air from blowing toward the operator.

At the bottom of the clean air generator 2, there is a wire mesh 3 with holes of a certain diameter so that the clean air flows in a laminar flow on the surface of the object to be coated, and a baking tray that burns the coating liquid onto the magnetic disk disk 1 after coating. Attached is a heat source 4 (for example, a lamp, etc.).

The magnetic disk disk 1 is attached to the shaft of an air motor 6 and a shaft via a bearing 7 with a clamp 5 so that it can be easily attached and detached.

The rotation of the magnetic disk disk 1 is controlled by passing through a compressed air feed pipe through a four-piece air piping set and a solenoid valve provided in a control unit (not shown) outside the coating machine, and converting the rotation speed. This is done by rotating the air motor 6 using compressed air controlled by a low-speed speed controller 8 and a high-speed speed controller 9, which are provided at the same time.

Here, in order to form a thin film with a constant thickness after dropping the coating liquid, in order to control the number of revolutions of the magnetic disk disk 1, not only the supply but also the exhaust from the air motor 6 is controlled by the displacement adjustment valve 10.
Once controlled, the exhaust pipe 11 exhausts the air to a predetermined location.

The air motor 6 is fixed to a base 13 by a fixing shaft 12 so as not to vibrate during rotation, and smoothly transmits rotational force to the magnetic disk disk 1 by a bearing 7.

Inside the casing 14 is a tank 15 in which a coating liquid is previously placed, and is connected to a coating liquid supply device 16 that dispenses a fixed amount.

There is a nozzle 18 at the tip of the coating liquid dropping head 17, and the coating liquid sent through the coating liquid supply pipe 19 is controlled by the dropping position control air cylinder 20, and then transferred to the nozzle 1.
Drip from 8.

When the air cylinder 20 for controlling the dropping position is not operating and the coating liquid supply device 16 is operating, the coating liquid is continuously circulated back to the coating liquid supply device 16 through the return pipe 21.

When coating the coating liquid on the magnetic disk disc 1, the coating liquid dropping head 17 is moved at a constant speed in the radial direction on the surface of the magnetic disk disc 1 at a predetermined height. This is accomplished by rotating a pulley 23 mounted on the shaft using an air motor 22 provided with an air motor 22, and rotating a pulley 25 mounted on the shaft of the coating liquid dropping head 17 using a transmission belt 24.

There is a cam 26 on the shaft to which a pulley 25 is attached to control the coating liquid dripping position, and the coating liquid dripping head 17
The limit switch 100 is configured to be in contact with an explosion-proof limit switch 100 that takes signals for regulating the movement range of the air motor 22 and for reversing the air motor 22.

A coating liquid scattering prevention cover 2 is provided on the outer periphery of the magnetic disk disk 1.
7 is attached to prevent the coating liquid from scattering.

In order to set and reset the magnetic disk disk 1, there is a window 29 on the front of the machine that can be slid up and down along the guide 28.
is attached, and a glass plate 30 is fixed to the other surfaces.

Incidentally, on the back side of this coating machine, there is constructed a duct 31 having a wire mesh at the inlet for exhausting the volatile components of the coating liquid to a predetermined location.

Reference numeral 32 denotes a shaft for rotating the object to be coated, which connects the magnetic disk disk 1 through a bearing 7 when the air motor 6 rotates the magnetic disk disk 1 .

FIG. 2 is an explanatory diagram showing the state in which the coating liquid dropping head 17 moves on the surface of the magnetic disk disk 1, and the coating liquid dropping head 17 moves one cycle from A-+B→C-+D-)E. Explosion-proof limit switch 101 for checking the position at which the coating liquid is dripped and the position at which the dripping is stopped, that is, the position at which the air cylinder 20 for controlling the dripping position shown in FIG. 1 is operated.
This shows the arrangement of explosion-proof limit switches 102 for the starting point and the cycle end point of the coating liquid dropping head.

Each of these limit switches is operated by a cam 26.

Note that the rotational speed of the air motor 6 is different when dropping the coating liquid and when shaking the coating liquid to a constant thickness, so this is time-controlled by a timer installed in the control section, and a solenoid valve that is linked by the timer is used. The speed controller is connected to the solenoid valve through a tube through which compressed air flows, and the solenoid valve is connected to the speed controller.

These timers and electromagnetic valves are integrated into a separate control section (not shown) along with switches for various operations.

The operation of this embodiment of the coating machine having the above configuration will be explained step by step.

First, as a preparatory work, move the window 29 along the guide 28 in Figure 1.
After opening and fixing the magnetic disk disk 1 upward, the magnetic disk disk 1 is connected to a shaft 32 for rotating the object to be coated, which passes through the bearing 7 and is connected to the air motor 6, and is provided on the opposite side of the air motor 6. Fix it with clamp 5, and after fixing, make sure to
Close 9.

Note that at this time, in order to clean the environment of the magnetic disk disk 1, the power of the clean air generator 2 is already turned on.

Next, the coating liquid supply device 16 is operated to supply the coating liquid to the supply pipe 19.
, a low-speed speed controller 8, a high-speed speed controller 9, and an air motor 22 for rotating the coating liquid dropping head 17, which are circulated by a return pipe 21, and are connected to an air motor 6 for rotating the magnetic disk disc 1, and a low-speed speed controller 8, a high-speed speed controller 9, and an air motor 22 for rotating the coating liquid dropping head 17. The compressed air in each speed controller is adjusted using a 3-piece regulator and speed controller for each air piping.

When the star I switch is pressed after turning on the control unit, the solenoid valve connected to the low-speed speed controller 8 of the air motor 6 and the solenoid valve connected to the speed controller for the air motor 22 are turned on. The compressed air flows at each set pressure.

When the compressed air flows, the air motor 6 starts rotating at a low speed, and the coating liquid dripping head 17, which was similarly controlled by the explosion-proof limit switch 102 for the start point and cycle end point, also moves to A-)B in FIG. move in the direction.

Limit switch 10 that moves and confirms dripping at position B
1 is turned on, the solenoid valve for the air cylinder 20 for controlling the dropping position, which is attached to the coating liquid dropping head 17, is activated, so the cylinder 20 is activated, and the supply pipe 19,
The coating liquid that has been constantly circulating in the return pipe 21 flows down from the nozzle 18.

In this state, the coating liquid dropping head 17 moves to position C in the figure, and when the limit switch 100 is turned on, the previous solenoid valve is turned off, and another solenoid valve for reverse rotation is activated, so that the flow of compressed air is stopped. Instead, the air motor 22 rotates in the opposite direction.

Therefore, it moves in the C-+D direction.

When the limit switch 101 is moved and checked for dripping again at position D in the figure, the solenoid valve connected to the air cylinder 20 for controlling the dripping position is turned off, so the cylinder 20 is also returned to its original position and the nozzle 18 is turned on. It is closed and the coating solution no longer flows down and begins to circulate again.

Here, A-)B-+C-)D and the coating liquid dropping head 17
When the timer in the control unit that has set the time for movement of the motor runs out, the solenoid valve connected to the low-speed speed controller 8 is turned off, and the low-speed compressed air stops flowing.

At the same time, the solenoid valve connected to the high-speed speed controller 9 operates, so the air motor 6 starts rotating at high speed.

The coating liquid dropping head 17 continues to move in the D→E direction, but it stops because the electromagnetic valve is turned off by turning on the -cycle end point explosion-proof limit switch 102.

As the air motor 6 rotates at high speed, the magnetic disk disk 1 also rotates at high speed, and the coating liquid dropped on the surface is also shaken off toward the coating liquid scattering prevention cover 27, forming a thin film with a constant thickness.

When the timer in the control section that has set this high-speed rotation for a certain period of time runs out, the solenoid valve connected to the high-speed speed controller 9 is also turned off, so the rotation of the air motor 6 is stopped.

The time for rotating at this high speed is set based on experimental results.

Next, as a finish, the coated surface is baked so that the circumference of the magnetic disk disk 1 reaches about 200° C., and the heat source 4 is energized to perform baking.

Once the baking is complete, use the guide 28 again to open the window 29.
When opening, the clamp 5 is removed and the magnetic disk disk 1 is taken out, but this is done after several seconds have elapsed in order to exhaust the volatile components inside the glass plate 30 through the duct 31.

By the above operations, the coating liquid has been applied to the magnetic disk disk 1 and baking has also been completed.

Do the same thing on the other side.

In addition, if the amount of the coating solution to be dropped is large and the rotation speed of the air motor 6 is low, there is a risk that the coating solution will go around the back surface of the magnetic disk disk 1. To prevent this from occurring, the optimal amount of drops and rotation speed were determined based on experimental results. I have chosen it.

Although one embodiment has been described above, the coating machine of the present invention provides the following effects.

(1) Since an air motor is used to drive the rotation of the object to be coated, there is no danger even if volatile components are used in the coating liquid without the need for special explosion-proof measures, and the rotation speed can be adjusted from low to high speeds. Easy and stepless selection.

(2) Instead of putting the coating in a special oven for baking after coating, this coating machine allows baking to be done in the same state after coating, improving work efficiency.

Furthermore, there is less dust and other substances adhering to the surface.

(3) Since the clean air generator is installed above the object to be coated and the duct is installed on the opposite side of the work surface, only a small amount of wind blows out towards the worker, making it easier for the worker to apply the volatile components. It is unlikely that it is harmful.

(4) On the air blowing surface side of the clean air generator, a pitch-processed wire mesh with hole diameters set to create a laminar flow of clean air on the surface of the object to be coated is installed, so that the coating liquid can flow onto the surface of the object to be coated. The surface is no longer mottled.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a coating machine according to the present invention, and FIG. 2 is an explanatory view showing a state in which the coating liquid dropping head in FIG. 1 moves. In the figure, 1 is a magnetic disk disc, 2 is a clean air generator, 3 is a wire mesh, 4 is a heat source for baking, 5 is a clamp, 6 is an air motor, 7 is a bearing, 8 is a speed controller for low speed, 9 is a high speed speed controller, 10
11 is an exhaust volume adjustment valve, 11 is an exhaust pipe, 12 is a fixing shaft, 13 is a base, 14 is a housing, 15 is a tank, 16
17 is a coating liquid supply device, 17 is a coating liquid dropping head, 18 is a nozzle, 19 is a supply pipe, 20 is an air cylinder for controlling the dropping position, 21 is a return pipe, 22 is an air motor, 23 and 2
5 is a pulley, 24 is a transmission belt, 26 is a cam, 27 is a coating liquid scattering prevention cover, 28 is a guide, 29 is a window, 30
3 is a glass plate, 31 is a duct, 32 is a shirt for rotating the object to be coated), and 100, 101, and 102 are limit switches.

Claims (1)

[Scope of utility model registration request] When dropping the coating liquid onto the surface of the object to be coated, the object to be coated is rotated at low speed, and after the drop is finished, the object to be coated is switched to high speed rotation to shake off the coating liquid on the surface of the object to be coated. In a so-called rotary coating machine that forms a uniform thin film on the surface of an object, a shaft for rotating the object that holds the object and passes through a bearing installed perpendicular to the object is connected to the underside of the object. The air motor 6 is installed as a rotation drive source for the object to be coated, and is equipped with a speed controller and a valve for low-speed rotation, high-speed rotation, and displacement adjustment to adjust the flow rate of incoming compressed air and outflowing compressed air. , a heat source 4 for baking is installed in parallel to the surface of the object to be coated, and a heat source 4 for baking is attached to the upper side of the heat source 4 for baking. A rotary coating machine characterized in that it is equipped with a clean air generator 2 equipped with a wire mesh 3 which is parallel to the surface of the object to be coated and has holes set on the side of the surface of the object to be coated.