JPH04507Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a digital switch that is attached to, for example, an electronic device, a sequencer measuring device, etc., and sets a count of time or temperature.

<Summary of the invention> A rotor with a conductive pattern on the side surface and a ratchet gear in the center boss, a feed pawl that rotates the rotor in forward and reverse directions, and a brake pawl that engages with the gear groove are protruded into the case. For a switch incorporating an operating member having a pair of slide shafts, a protrusion is provided on the side wall of the case to support the rear surface of the slide shaft, facing each slide shaft, so that when the rotor rotates, the gear groove The elastic reaction force toward the gear side is strengthened against the brake pawl that is pushed out more, and the one-pitch feeding operation is made smoother and the stopping accuracy is improved.

<Background of the invention> The applicant had previously worked on miniaturizing digital switches,
In order to simplify the configuration and assembly work, we incorporated a rotor with a conductive pattern into the case, a feed pawl that rotates the rotor in forward and reverse directions, and an operation member that includes a spring part in series, and the case lid. Proposed a contactor unit configured in
No.).

Although the switch mentioned above achieved its intended objectives, such as reducing the number of parts, simplifying the assembly work, simplifying the structure, and making the switch smaller, the reaction force of the brake pawl's engagement with the gear groove was weak due to the structure of the operating member. It has been found that there is a disadvantage in that the gears and pawls do not mesh sufficiently when the rotor advances, making it impossible to obtain accurate stopping position of the rotor.

<Purpose of the invention> The present invention has a simple structure in which projections are provided on the inner wall of the case opposite to both slide shafts.
It is an object of the present invention to provide a digital switch which strengthens the reaction force of a brake pawl and improves the accuracy of a rotor's stopping position.

<Configuration and Effects of the Invention> In order to achieve the above object, in the present invention, protrusions are provided on the inner surface of the case opposite to both slide shaft portions of the operating member. According to the above configuration, in the present invention, when the ratchet gear rotates step by step due to the push operation of one slide shaft, and the brake pawl of the other slide shaft is pushed out of the gear groove, the protrusion supports the rear surface of the slide shaft. This has the effect of strengthening the elastic reaction force, reliably engaging the succeeding gear groove, and regulating the stopping position of the rotor.

<Description of Embodiments> FIG. 1 shows an exploded perspective view of the digital switch of the present invention.

The digital switch has a side-opening case 1 made of synthetic resin, an operating member 2 and a rotor 3 built into the case 1, and a large number of fixed contacts 40 fitted into the opening of the case 1. It consists of a contactor unit 4.

The case 1 is a synthetic resin molded case in which front and rear walls 11 and 12 and upper and lower walls 13 and 14 are integrally formed on each side of a side wall 10 forming a bottom plate. A see-through window 15 is opened in the upper and lower walls 13, 1, and punch holes 16, 16 are opened in the vertically symmetrical positions of the transparent window 15.
4 has protrusions 18a, 18b, and the rear wall 12 has protrusions 1.
7. A pivot 18 is integrally formed on the side wall 10.

The operating member 2 is made of an elastic synthetic resin material, and has a series of loop-shaped spring parts 21, 21 at the rear of the parallel vertical slide shaft parts 2a, 2b, approximately spaced apart from the above-mentioned extraction holes 16, 16. It is a molded body in which the spring parts 21, 21 are connected by a mounting plate 22, and each slide shaft part 2a, 2b has a push shaft part 23a, 23b at the front end, and a rotor 3 on the inside facing each other. Feed claws 24a, 2 that advance in the forward and reverse directions
4b and the brake arms 25a, 25 each having a brake claw 26 formed at its tip to stop the rotor 3 in the forward movement position.
b are formed symmetrically, and the operating member 2 is fitted into the case by inserting both the bushing shaft portions 23a and 23b into the extraction holes 16 and 16 from the inside, and attaching the mounting plate 22.
The concave portion 27 of the case 1 is engaged with the corresponding protrusion 17 of the case 1, and the case 1 is housed in the case.

The rotor 3 is a synthetic resin molded body having a pivoting boss portion 31 at the center of a circular base plate 30 and a cylindrical wall 32 on the outer periphery, and the outer surface of the base plate 30 is in contact with the contact 40 of the contactor unit. A conductive pattern 33 is provided, and characters 34 such as numbers corresponding to the conductive pattern are provided on the outer surface of the cylindrical wall 32, and a ratchet gear 35 having a number of teeth corresponding to the number of characters is provided on the central boss portion 31. , when the boss portion 31 is pivotally supported on the pivot shaft 18 of the case 1, one letter 34 on the outer periphery is located in the transparent window 15, and each slide shaft portion 2
The feed pawls 24a and 24b of a and 2b mesh at symmetrical positions on the front circumference of the ratchet gear 35, and the brake pawl 26 at the tip of the brake arm meshes at symmetrical positions on the rear circumference of the ratchet gear 35.

However, as shown in FIG. 2B, when one push shaft portion 23a is pressed, the slide shaft portion 2a bends and deforms the spring portion 21 to move, and the tip of the braking arm 25a protruding from the slide shaft portion 2a moves. The brake pawl 26 is separated from the ratchet gear 25 and the feed pawl 2
4a applies rotational input to the gear. At this time,
The other slide shaft portion 2a rotates approximately around point P as the engaged brake pawl 26 is pushed out of the gear groove 36 as the gear 35 rotates. At this time, the spring portion 21 of the slide shaft portion 2b comes into contact with the protrusion 18b, and due to this contact, a spring force is applied to the brake arm 25b in the gear direction. reaches the peak of the gear 35, and the spring force also becomes maximum.

When the feed pawl 24a is pushed further, the brake pawl 26 passes over the top of the gear 35, and at this time, the brake pawl 26 is pushed to the next gear groove 3 by the maximum biased spring force.
6. As a result of this operation, the rotor 3 rotates by one pitch, and the character 34 of the rotor 3 that has advanced by one pitch is positioned in the display window, and in response to this, the fixed contact 40 switches the conductive pattern 33, according to the displayed number. outputs a digital signal (FIG. 2C).

When the other push shaft portion 23b is pressed, the slide shaft portion 2b performs the same operation as described above, and the gear 3
The rotor 3 including the rotor 5 is rotated in the opposite direction, and a character display and a signal are output in accordance with the reverse rotation.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the digital switch of the present invention, and FIGS. 2a, b, and c are internal configuration diagrams of the digital switch of the present invention, respectively. 1...Case, 18a, 18b...Protrusion, 2...
...Operation member, 2a, 2b...Slide shaft portion, 21
... Spring part, 24a, 24b ... Feed claw, 25
a, 25b...braking arm, 26...braking claw, 3
... Rotor, 31 ... Boss section, 32 ... Cylinder wall, 3
3...Conductive pattern, 34...Character, 35...Ratchet gear, 4...Contact unit, 40...
...Fixed contact.

Claims (1)

[Scope of utility model registration request] The rotor is equipped with a rotatable bearing inside the case, has a conductive pattern on the side, a string on the outer circumferential surface, and a ratchet gear in the center boss. an operating member having a pair of sliding shaft portions protruding from a pawl and a brake pawl that engages with an output side gear groove; and a contactor unit having a fixed contact formed on a case lid and in contact with a conductive pattern of a rotor. In a switch that outputs a digital signal by turning the rotor one pitch forward or backward to turn the contact on and off and output a digital signal, the opposite wall of the case has a structure in which, when the rotor rotates, the other brake pawl is connected to the gear groove. A digital switch comprising opposing protrusions that strengthen the elastic reaction force of the brake pawl toward the gear side when the brake pawl is pushed out further.