JPS5852988Y2 - digital switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotary set of digital switches equipped with a push button type operating member.

Digital switches are generally used as setting devices for counters, digital timers, etc. in various electronic devices such as automatic control equipment and measuring equipment, and are usually single-digit digital switches that can arbitrarily set 10 numbers from 0 to 9. A desired number of digits are arranged in parallel and used.

Therefore, for example, if the number is 3 digits, it can be set in the range of 000 to 999.

However, in the form in which it is actually used, for example, 000 to
It is often set within a range such as 399, and if a setting value that exceeds that range is accidentally given, unexpected situations often occur.

In response to such needs, digital switches have conventionally been put into practical use that regulate the rotation range of the rotor and limit the setting range to, for example, O to 3. Pins are press-fitted into two locations in the circumferential direction of the rotor, and a protrusion is provided inside the case that comes into contact with the pins when the rotor is rotated to a predetermined position, allowing the rotor to rotate within the range restricted by the two pins. .

To further explain in detail based on FIG. 1, the rotor 1, which is a synthetic resin molded body, has a cylindrical part 2 on which numbers 0 to 9 are printed on the outer peripheral surface, and a cylindrical part 2 with numbers 0 to 9 printed on the outer circumferential surface, and a
It consists of a gear part 3 formed with two teeth, and a disc part 4 that connects the two. Small hole 5...
...or a small hole 6... is bored.

Then, the pins 7.7 are press-fitted into appropriate small holes 5..., 6..., depending on the desired setting range.

However, this method of press-fitting the pins 7.7 has disadvantages as the digital switch becomes smaller (that is, the rotor 1 becomes smaller).

That is, the method of press-fitting the pins 7.7 into the gear part 3 requires space, both in terms of forming ten small holes 5 in the gear part 3 with a limited area and in terms of the press-fitting work. In addition, the method of press-fitting the pins into the small holes 6 of the disc part 4 is difficult to obtain because the wall thickness of the disc part 4 is thin. It has the disadvantage that it cannot be used and easily falls off.

This idea was made in view of the above points, and has a gear-shaped opening in the center that tightly fits into the gear part of the rotor.
In addition, by press-fitting a disc-shaped stopper with a stopper piece erected on the outer periphery into the base of the gear part, it is possible to easily obtain a digital switch that is limited to a desired setting range, regardless of the size of the rotor. It is something to do.

An embodiment of this invention will be described below based on the drawings.

In the drawing, 11 is a box-shaped case body made of synthetic resin, and 12 is a support shaft 1 protruding inside the case body 11.
This rotor 12 is rotatably supported by a rotor 3. Compared to the conventional rotor 12 shown in FIG. 1, this rotor 12 is not particularly different from the conventional one shown in FIG. Continuous numbers from 0 to 9 are printed at equal pitches on the outer peripheral surface of part 12a, and these numbers are printed one by one in display windows drilled on the top surface of the case body 11 as the rotor 12 rotates in divisions. It is displayed in section 14.

Further, a slider 15 having a plurality of contact pieces is attached to the front surface of the rotor 12, and a single gear portion 12b is formed on the back surface thereof.

16.16 is the gear part 12b inside the case body 11.
The operation member 16 is arranged symmetrically with the case body 11 in between and is held slidably in the vertical direction by the case body 11. The push button part 16a has a push button part 16a, and its inner lower end abuts against a protrusion 18 protruding into the case body 11 to regulate its position.

Further, a feed pawl 19 is formed on the inside of the upper part of the operating member 16 and projects diagonally downward. It is designed to be guided by coming into contact with the side.

That is, when the feed claw 19 presses the push button portion 16a,
Its tip descends along the guide section 20, and the gear section 1
2b to rotate the rotor 12 in divisions by one pitch.

Further, a positioning pawl 21 is protruded from the lower inner side of the operating member 16, and when not in operation, the positioning pawl 21 engages between the teeth of the gear portion 12b to prevent the rotation of the rotor 12. In addition, when one of the operating members 16 is pressed, the positioning claw 21 of the other operating member 16 will cause the operating member 16.16 to contact the bottom wall of the case body 11. The biasing force of a torsion coil spring 22 disposed between the two parts allows the rotor 12 to rotate one pitch at a time.

That is, when one operating member 16 is pressed, the feed claw 19
engages with the gear portion 12b to rotate the rotor 12, and as a result, the other operating member 16 moves backward as the positioning claw 21 is pushed by the teeth of the gear portion 12b. When engaged, the positioning pawl 21 is pressed again between the teeth by the spring force of the torsion coil spring 22, and the rotor 12 is positioned at the next divided rotation position.

Next, 23 is a transparent dust-proof cover that is attached to the front surface of the case body 11 so as to cover the front surface around the rotor 12 and the display window 14, and has a dust-proof rubber 24 embedded around its opening; The slider 15 connects the display window of the case body 11 by connecting predetermined wirings at each divided rotational position of the rotor 12 with a printed circuit board having a pattern and mounted on the front surface of the dustproof cover 23. Part 1
A predetermined output signal is output from the output terminal at the bottom end of the board in accordance with the number displayed at 4.

Furthermore, 26 is a convex part for limiting the setting range formed protrudingly at the lower part of the display window part 14 of the case body 11, and this is located in the concave part between the cylindrical part 12a and the gear part 12b of the rotor 12. .

27 and 28 are stopper pieces 27a and 28 at one end of a comparatively thin synthetic resin disk to abut against the convex portion 26.
a and a gear-shaped opening 27 b in the center.
, 28b, as shown in FIG. It is press-fitted.

Since the stoppers 27 and 28 are formed with the same diameter, the stopper piece 27a of the lower stopper 27 is on the outside of the outer periphery, and the stopper piece 28a of the upper stopper 28 is on the outside of the outer periphery.
a is formed inside the outer periphery.

Further, with respect to the gear portion 12b, a gear-shaped opening 27b,
28b is slightly long so that the tips of the tongue pieces 27C, 28C, .
and a sharply shaped and press-fit stop 27.2
8 will not fall off.

Therefore, the rotor 1 into which this stopper 27, 28 is press-fitted
2 is regulated by the stopper pieces 27 a and 27 b coming into contact with the convex part 26, so it can only rotate within the range where the convex part 26 is held, and as a digital switch,
Only consecutive numbers in the range corresponding to the rotatable range can be set, so a digital switch that is limited to any range of consecutive numbers from 0 to 9, such as O=3, can be press-fitted into the stopper 27 and 28. It can be easily obtained with just some work.

In the above embodiment, two stoppers 27 and 28 were used, but one with a long stopper piece erected in the range where setting is not possible is possible.
It is also possible to use two stoppers.

As is clear from the above explanation, the digital switch according to this invention has a gear-shaped opening in the center that tightly fits into the gear part of the rotor, and has a stopper piece erected on the outer periphery. A disk-shaped stopper is press-fitted into the base of the gear portion, and a convex portion that comes into contact with the stopper piece when the rotor rotates is formed in the case facing the disk-shaped stopper, thereby limiting the rotation range of the rotor. For example, it is possible to easily obtain a limited setting range such as O to 3 by printing continuous numbers from O to 9 by simply press-fitting the stopper, and it is especially easy to install the stopper even for small rotors. is possible, and has sufficient strength regardless of the thickness of the rotor, so it is more effective in downsizing this type of digital switch.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view of a conventional rotor, Fig. 2 is a cross-sectional front view showing an example of the digital switch according to this invention, Fig. 3 is a cross-sectional side view thereof, and Fig. 4 is an explanatory view showing the structure of a stopper. It is. 11...Case body, 12...Rotor, 15...Slider, 16...Operation member, 22...Torsion coil spring , 23...
・Dust-proof cover, 25... Printed circuit board, 26.
...convex. Part, 27.28...stopper.

Claims (1)

[Scope of utility model registration request] A predetermined serial number is printed on the outer circumferential surface, and a disc-shaped rotor is integrally formed around a gear part for dividing and rotating the rotor, and the rotor is rotated by pressing a push button part that protrudes outside the case. A rotary type digital switch comprising a pair of operating members that are rotated in a reciprocating manner, and a contact mechanism in a case is switched by rotating the rotor in divided rotations to select a desired output signal, the gear portion A disk-shaped stopper having a gear-shaped opening in the center that tightly fits into the gear and a stopper piece standing up on the outer periphery is press-fitted into the base of the gear part, and the above-mentioned A digital switch characterized in that a convex portion is formed that comes into contact with the stopper piece when the rotor rotates, thereby limiting the rotation range of the rotor.