JPS645783Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a digital switch.

A conventional digital switch will be explained based on FIGS. 1 to 3.

Reference numeral 1 denotes a case body, and on the inner wall there are a support shaft 1a that rotatably supports the number wheel 2, protruding pieces 1b, 1b that limit the upward extension of the reversal prevention piece 3, and a force of upward extension to the reversal prevention piece 3. A pedestal 1c for receiving the spring 4 and protrusions 1d, 1d for restricting the upward extension of the step arms 5, 5 are provided. Also, on the front of the case body 1, there is a display window 1e for displaying the numbers displayed on the number wheel 2.
and rectangular holes 1f, 1f for exposing the pushers 5a ₁ , 5a ₁ provided at the upper part of the step arms 5, 5 to the outside of the case body 1.

The number wheel 2 has numbers 0 to 9 displayed on its outer peripheral wall, a movable contact (not shown) is attached to one side, and a gear having teeth corresponding to the step number is attached to the opposite side. A shaped cam 2a is provided. In addition, a printed circuit board (not shown) is disposed on the side of the number wheel 2 that has the movable contacts, and the movable contacts are sequentially attached to the contact portions of the printed circuit board as the number wheel 2 rotates. The electrical signal corresponding to the number displayed on the display window 1e can be extracted by rotating contact.

The anti-reversal piece 3 is formed into a substantially square shape, and a spring 4 is interposed within this square shape to obtain the force for upward extension, and the locking pieces 1b of the case body 1 restrict the upward extension. I am receiving Further, the peaks of the anti-reversal piece 3 are pressed against the valleys of the cam 2a of the number wheel 2 to prevent the number wheel 2 from reversing and to assist in its rotation.

The step arms 5, 5 are formed in a substantially square shape and are disposed symmetrically with respect to the cam 2a of the number wheel 2. The pushers _5a1 , 5a1 at the upper portions of the outer arms 5a, _5a are inserted into the rectangular holes 1f,
The step arms 5, 5 are exposed from the protrusions 1d, 1d of the case body 1 and supported for vertical movement by springs 6, 6 interposed between the lower ends 5c, 5c and the bottom surface of the case body 1, and the connecting portions of the outer arms 5a, 5a and the inner arms 5b, 5b of the protrusions 1d, 1d of the case body 1 abut against each other to limit the upward extension of the step arms 5, 5 by the springs 6, 6. Step claws 5d, 5d are provided at the tips of the inner arms 5b, 5b and these step claws 5d, 5d are positioned opposite the sloping surface of one tooth of the cam 2a of the number wheel 2.

To explain the operation of the decimal digital switch in the digital switch mentioned above,
First, when the pusher _5a1 of the step arm 5 on the + side is pushed down against the force of the spring 6, the step pawl 5d of the inner arm 5b engages one tooth P of the gear-like cam 2a of the number wheel 2 that faces it. Push the slope ₁ and rotate it counterclockwise. On the other hand, the tooth P ₂ of the cam 2a is in contact with the left slope of the anti-reversal piece 3, and this tooth P ₂
moves to the right along the slope, and as a result, the reversal prevention piece 3 is pushed down. Then, when the step arm 5 is further pushed down, the teeth of the cam 2a
P ₂ climbs over the peak of the reverse prevention piece 3 and moves to the slope on the right side. Next, when the pressure on the step arm 5 is removed, the step arm 5 is extended upward by the force of the spring 6 and returns to its original position, and at the same time the tooth P ₁ of the cam 2a
The pressure of the step claw 5d that was pushing the step is removed. Therefore, the tooth _P2 of the cam 2a is the reverse prevention piece 3.
The force of the spring 6 causes it to further rotate counterclockwise along the right slope. In other words, the number displayed on the number wheel 2 is incremented by one.

When constructing digital switches with different step numbers using the operating principle described above, the case body, step arm, and other accessory parts are shared, and only the number wheel is matched to the step number. If it can be configured, it will be economical, work efficiency will improve, and inventory management will become more rational.

For example, FIG. 3 shows an example in which a hexadecimal digital switch is constructed by replacing the number wheel 2 with a hexadecimal one in a decimal digital switch. That is, the outer diameters of the gear-like cams for decimal and hexadecimal are the same, but as the number of steps increases, the number of teeth also increases, so the pitch interval between each tooth becomes smaller. Therefore, the step arm 5 is moved in the same manner as the stroke S in decimal notation, and in hexadecimal notation, two teeth P ₂ and P ₃ go over the mountain part of anti-reversal piece 3 and reach the right side with one pressing operation. Transition to slope.
In other words, one pressing operation of the step arm 5 causes the digital switch to move two steps forward, which disturbs the normal operation of the digital switch.

This idea was proposed to improve the above-mentioned shortcomings, and allows a wide variety of digital switches to be used by sharing the case body, step arm, and other attached parts, and simply replacing the numeric wheel for different step numbers. It is composed of

This invention will be explained below based on the embodiment shown in FIGS. 4 and 5.

This invention has protrusions 1g, 1g integrally formed on the inner wall surface of the case body 1 at the tip positions of the step claws 5d, 5d of the inner arms 5b, 5b, and the inner arms 5b, 5b are moved toward the outer arms 5a, 5a. Push it out and change the movement trajectory of the step claws 5d and 5d.
It constitutes a hexadecimal digital switch.

FIG. 5 shows a hexadecimal digital switch made of decimal components, and is a front view showing the relationship between the step arms 5 and the gear-shaped cam 2a of the number wheel 2.

To facilitate understanding of this invention, the operation will be explained. First, when the step arm 5 is pushed down, the step claw 5d moves only up and down, so the step claw 5d moves towards the teeth of the cam 2a.
P ₁ and the two teeth P ₂ and P ₃ will cross over the peak of the anti-reverse piece 3 from left to right, but in this design, the protrusion 1 from the case body 1
g is provided near the tip of the step claw 5d, and the step claw 5d is pushed out toward the outer arm 5a by the protrusion 1g, so when the step arm 5 is pushed down, the step claw 5d Since it moves downward while approaching the cam 2a side, it does not touch tooth _P1 of cam 2a, but teeth _P4 , and only tooth _P2 is able to get over the peak of the anti-reverse piece 3, resulting in a decimal Even if the stroke S of the step arm 5 is for 1, it is possible to move the hexadecimal number wheel 2 by one step.

As is clear from the above explanation, according to this invention, the shape of the step arm 5 can be changed by simply providing the protrusion 1g on the case body 1 for pushing the step claw 5d of the step arm 5 toward the outer arm 5a. Since it is possible to change to a digital switch with a different number of steps without changing the outer diameter of the gear-shaped cam 2a of the wheel 2, all parts other than the number wheel 2 can be used in common, thus improving assembly efficiency. It not only greatly contributes to lower manufacturing costs, but also has practical effects such as making inventory management extremely easy.

[Brief explanation of drawings]

Figures 1 to 3 show conventional examples; Figure 1 is a perspective view of a digital switch with some parts removed; Figure 2 is a 10
Figure 3 is a diagram of the relationship between the gear-shaped cam and step claw of a hexadecimal digital switch, Figure 4 is a diagram of the relationship between the hexadecimal gear-shaped cam and step claw, and Figure 4 is a diagram with some parts related to this invention removed. FIG. 5, which is a front view of one embodiment, is an explanatory view of the operation of the main parts according to this invention. 1...Case, 1a...Spindle, 1b...Protruding piece, 1c...Base, 1d...Protrusion, 1e...Display window, 1f...Protrusion, 2...Number wheel, 2a...Gear shaped cam, 3... reverse rotation prevention piece, 5... step arm, 5a... outer arm, 5a ₁ ... pusher, 5
b...Inner arm, 5c...Step claw.

Claims (1)

[Scope of utility model registration request] A number wheel with a symbol marked on the outer peripheral wall, a movable contact on one side, and a gear-shaped cam with a number of teeth corresponding to the number of steps on the opposite side;
A case body that pivotally supports the number wheel, and an outer arm of a step arm that is vertically movable with a spring or the like interposed in the case body, and the pusher of the step arm is inserted from the outside of the case body. When the step arm is moved downward by pressing the step arm, a step pawl formed on the inner arm of the step arm is engaged with the gear-like cam to rotate the number wheel by one step. 1. A digital switch characterized in that a protrusion is formed on the case body so as to push the step claw toward the outer arm.