JPS6025809B2 - How to install the operation button - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of attaching a push button for operating a mechanism of a tape recorder.

The push-type operation button, which is mainly used in portable tape recorders, is made of synthetic resin molding. Conventionally, adhesives have been used to attach this operation button to the sheet metal operation lever, or They used locking pins and screws. For this reason, these conventional mounting methods are not only inefficient, but also tend to cause the operating button to come off if the operating button and operating lever are not properly attached.

In order to attach the operating button to the operating lever, the present invention uses an ultrasonic welding device to melt a part of the inner wall of the operating welding bar mounting hole by ultrasonic vibration, and firmly attaches the operating button to the operating lever. This is how it was done.

In addition, an ultrasonic welding device applies ultrasonic energy generated from an ultrasonic vibrator to a synthetic resin, and generates ultrasonic heat at the contact surface of the synthetic resin and other parts that are in contact with the synthetic resin. This is a device for melting.

FIG. 1 shows the overall device for realizing the bare button mounting method according to the present invention. It is fixed by a chassis fixing base 4 having pins 3..., and each of the operating levers 2...
There is a synthetic resin molded operating spade 5 on the button attachment part.
... is provided with the bar mounting hole temporarily inserted.

A welder device 6 is disposed facing above each of the operating nails 5, and the welder device 6 is supplied with electric vibration energy (ultrasonic energy) from an ultrasonic generator 7 through a cable 8. By moving this welder device 6 downward, each operation button 5...
It is used to simultaneously press against...

The present invention uses an ultrasonic welder device as described above,
The operating nail is attached to the operating lever, and the relationship between the operating lever and the operating button will be explained next.

As mentioned above, the operating lever 2 for the mechanism is made of sheet metal, and the operating nail 5 is injection molded from ABS resin or the like.

As shown in Fig. 2, the button mounting portion 2' of the operating lever 2 has a width dimension B that is slightly narrower than the width dimension A of the lever mounting hole 5' of the operating lever 05, and a width dimension B that is moderately wider than the width dimension A. It has a width dimension D and a width dimension C narrower than the width dimension B to form a recess that allows the inflow of molten resin.

Therefore, the operating lever 05 for the plow mounting portion 2' of the operating lever 2
When inserting the tension bar mounting hole 5', width dimension B and width dimension C are
The portion easily enters the mounting hole 5' and is locked to the width D portion, resulting in the temporarily inserted state shown in FIG.

In this state, the upper surface of the operating plow 5 is pressed by the ultrasonic welding device 6 described above.

When the upper surface of the operating spade 5 is pressed by this ultrasonic welder device 6, ultrasonic heat is generated in the portions 5'' and 5^ where the operating lever 2 and the operating spade 5 are equally connected in FIG. Since the resin melts, if an appropriate amount of pressure is applied at the same time as applying ultrasonic waves from the top surface of the operating spade 5, the resin on the inner wall of the lever attachment hole 5' of the operating button 5 will be sequentially melted as shown in FIG. The sword mounting part 2 of the operation lever 2 is inside the operation button 5 while
' is filled with iron, and the resins X and X melted at this time flow into the recess 2'' formed by the width dimensions B, C, and D of the operating lever 2, and the operating button 5 and the operating lever 2 After the press-fitting work is completed, it solidifies and becomes the state shown in Fig. 5.The inventor's experiments have shown that the operating lever 2 and the operating nail 5 are in contact with each other as shown in Fig. 6. The lower edges 2a, 2a of the contacting recesses are formed to be inclined upward, and the contact surfaces between the operating lever 2 and the resin portion of the operating nail 5 are formed so as to be in approximately line contact, thereby preventing melting of the resin. It has been found that the faster the flow, the easier the flow into the recess 2''.

Furthermore, by setting the width dimensions B, C, and D of the operating lever 2 so that the volume of the molten resin and the volume of the recess 2'' are approximately the same, the operating lever 5 and the operating lever 2 can be firmly fixed. It is something that can be done.

As described above, according to the method for attaching the operating sword according to the present invention, it is possible to attach the synthetic resin operating lever to the sheet metal operating lever in a short time by using an ultrasonic welding device. The installed condition is such that the molten resin on the inner wall of the mounting hole of the operation plow is guided into the recess by the lower edge of the recess of the operation lever and allowed to flow and solidify, so the operation plow and the operation lever are completely connected. This results in a resin-bonded state, allowing for reliable installation. And the first
As shown in the figure, multiple control buttons and control levers can be attached at the same time, which significantly improves work efficiency compared to the conventional method of attaching each button and lever individually with adhesive. , its industrial value is great.

[Brief explanation of drawings]

Fig. 1 shows the overall device for realizing the method of mounting an operating plow according to the present invention, Fig. 2 shows the relationship between the operating lever and the operating lever, and Fig. 3 shows the state in which the operating button is temporarily inserted into the operating lever. Figure 4 shows the operation nail being inserted into the operation lever using an ultrasonic welder, Figure 5 shows the operation button completely attached to the operation lever, FIG. 6 is a diagram of the main part of an embodiment in which the shape of the operating lever is partially changed. 2...Operating lever, 2'...Button mounting part, 5...
...Operation button, 5'... Bar mounting hole, 6.
...Ultrasonic welder lighting. Figure 1 Figure 2 Figure 8 Figure 4 Figure 5 Figure 8

Claims (1)

[Claims] 1. A method of mounting an operating button in which a button mounting portion of a sheet metal operating lever and a lever mounting hole of a synthetic resin operating button are fitted, the method comprising forming recesses on the left and right sides above the button mounting portion of the operating lever, and When the lower edge of the recess is tilted upward and the operating lever is fitted into the lever mounting hole of the operating button,
While pressing an ultrasonic welder device onto the operating button, the inner wall of the lever mounting hole of the operating button is melted and cut at the lower edge of the recess to fit the operating button to the operating lever, and the operating button is fitted into the operating lever. A method for attaching an operation button, characterized in that the molten resin is guided into the recess at the lower edge of the recess and allowed to flow and solidify.