JPH0214099Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a digital switch, and in particular to the structure of a stopper piece that limits the rotation of the number wheel.

Digital switches are generally used as setting devices for control equipment, electronic equipment, etc. Decimal digital switches are usually configured as single-digit digital switches that can arbitrarily set 10 different numbers from 0 to 9. These are used in series for the desired number of digits. For example, if it is 2 digits, it starts from 00.
A range of 99 can be set. However, the mode actually used is often limited to a range of 00 to 28, for example.
Therefore, if you mistakenly set it beyond that range, an unexpected situation could occur.

To meet this need, there have been conventional digital switches that restrict rotation.As a means of regulating this, pins are press-fitted into two locations around the number wheel, and when the number wheel is rotated to a predetermined position, the pins are pressed into place. There is a device that allows the number wheel to rotate within the range restricted by the two pins by providing abutting protrusions inside the case. With the miniaturization of the device, space became unreasonable, and since pins were used, sufficient strength could not be obtained.

This idea was made in view of the above points,
It has an opening in the center that fits into the gear part of the number wheel,
The desired setting range is set by fitting a disc-shaped stopper piece, which has a concentric notch cut out at most (n-1)/n on the outer periphery, into the gear part of the number wheel. The aim was to create a digital switch that was limited to

This invention will be explained below based on an embodiment shown in FIGS. 1 to 3.

Reference numeral 1 denotes a case made of synthetic resin, and the front side is provided with a display window 1a through which the numbers on the number wheel 2 can be seen, and a hole 1b through which the pressing part 4b of the operating member 4 is exposed from the case 1. A protrusion 1c is provided on the upper inner surface of the stopper piece 3 to restrict rotation by coming into contact with the stopper piece 3, and the size of the protrusion 1c is 1/10 of the outer circumference of the stopper piece 3. , a hole 1d for pivotally supporting the support shaft 2a of the number wheel 2 and a hole 1e for inserting the anti-reversal piece 5 are provided in the center.

The number wheel 2 is for decimal, and there is a 0 on the outer circumference.
Ten numbers from 9 to 9 are printed at equal intervals.
A contact 6 that slides on a circuit formed on a printed board 7 and derives an output signal when the number wheel 2 rotates is disposed on one side, and an opening recess 2b is provided on the other side. A first gear-shaped cam portion 2c that fits with the stopper piece 3 is formed in this recess 2b, and a first gear-shaped cam portion 2c that engages with the feed pawl 4c of the operating member 4 is formed in the recess 2b. A second gear-shaped cam portion 2d is formed, and a support shaft 2 is formed on this second cam portion 2d.
a is formed.

The stopper piece 3 is disc-shaped, and has a gear-shaped opening 3a in the center that fits with the first gear-shaped cam part 2c of the number wheel 2, and a gear-shaped opening 3a that fits into the first gear-shaped cam part 2c of the number wheel 2. A cutout portion 3b is formed by cutting out the /10 portion concentrically. And stopper piece 3
Fit the opening 3a of the number wheel 2 into the first cam portion 2c of the number wheel 2, and fit the stopper piece 3 into the recess 2b of the number wheel 3, so that the recess 2b side of the number wheel 2 faces the case 1. The support shaft 2a of the number wheel 2 is attached to the case 1 so that the rotation regulating protrusion 1c provided on the case 1 fits into the notch 3b of the stopper piece 3.
It is pivotally supported in the hole 1d. Note that when the stopper piece 3 is inserted into the recess 2b of the number wheel 2, the height of the cam part 2c is adjusted so that the surface of the first cam part 2c, the surface of the stopper piece 3, and the side surface of the number wheel 2 are flush with each other. The depth of the recess 2b and the thickness of the stopper piece 3 are adjusted in advance.

In the operating member 4, a pressing part 4b is provided at the upper part of the outer arm 4a, an inner arm 4c is provided from the lower part of the outer arm 4a, and a rotating feed claw 4d is provided at the upper part of the inner arm 4c. The operating member 4 has a spring 8 interposed between its lower end and the case 1, and is disposed symmetrically across the second cam portion 2d of the number wheel 2, and the pressing portion 4b is located on the case 1. It is arranged so as to protrude from the front hole 1b, and the upper limit of the operating member 4 is limited by the pressing part 4.
The downward restriction is achieved by the step 4e provided at the bottom of the outer arm 4a coming into contact with the case 1, and the downward restriction is achieved by the step 4f provided on the outer arm 4a coming into contact with the step 1f provided on the case 1. The inner arm 4c is moved by the guide piece 1g provided on the case 1.
The upper and lower guides are performed.

Reference numeral 5 designates a reversal prevention piece, which has a peak 5a formed at its upper part, and a locking piece 5b that engages with the lower part of the guide piece 1g at its lower part. 5a, a part of the peak 5a is fitted into the hole 1e of the case 1, and the peak 5a is connected to the second gear-shaped cam part 2 of the number wheel 2.
When the pressing portion 4b of the operating member 4 is pressed, the feed pawl 4d of the inner arm 4c descends downward, and the second cam portion 2d of the number wheel 2 is disposed so as to correspond to the valley of the tooth d. The number wheel 2 is rotated by one pitch by contacting the teeth, and when the pressing force on the pressing portion 4b is removed, the operating member 4 returns to its original state by the force of the spring 8.

Next, the limited operation of the digital switch will be explained.

First, when limiting the rotation range of the number wheel 2 to 1 to 3 in a decimal digital switch, a stopper piece is formed on the outer periphery with a notch 3b concentrically cut out at 3/10 of the outer periphery. 3 is fitted into the first gear-shaped cam portion 2c of the number wheel 2, and the number is adjusted so that the rotation regulating protrusion 1c provided on the case 1 fits into the notch 3b of the stopper piece 3. A support shaft 2a of a vehicle 2 is supported in a hole 1d of a case 1. When the operating member 4 is pressed, the number wheel 2 rotates, but the opening 3a of the stopper piece 3
is fitted into the second cam portion 2d of the number wheel 2, so the stopper piece 3 rotates together with the number wheel 2.
However, since the protrusion 1c of the case 1 is fitted into the notch 3b of the stopper piece 3, if the protrusion 1c comes into contact with the side wall 3c of the notch 3b of the stopper piece 3, the number wheel 2 will not rotate and the stopper piece 3 limits the rotation of the number wheel 2, and the number wheel 2 only rotates within the range of the cutout portion 3b of the stopper piece 3. Stopper piece 3 can be freely moved to number wheel 2
Since the notch part 3b of the stopper piece 3 is 3/10, it can be inserted into any range (in this case, the notch part 3b of the stopper piece 3 is 3/10, so
Rotation range) can be selected, for example, from 0 to 2 or from 3 to 5.

As is clear from the above description, the digital switch according to the invention has a number wheel with a recess formed on one side and a first gear-shaped cam part and a second gear-shaped cam part formed in the recess. A stopper piece has a gear-shaped opening in the center that fits into the first gear-shaped cam part, and a stopper piece having a concentric notch cut out at most (n-1)/n part of the outer periphery on the outer periphery. At the same time, the rotation regulating protrusion provided on the case is fitted into the notch of the stopper piece, and when the number wheel 2 is rotated, the protrusion is brought into contact with the side wall of the notch of the stopper piece. Since the rotation range of the stopper is limited, it can be easily obtained by simply inserting a stopper piece with a notch in the necessary range into the number wheel, and one stopper piece can also be inserted into the recess of the number wheel. This contributes to the miniaturization of the digital switch and reduces costs.Furthermore, since the side wall of the cutout part of the stopper piece comes into contact with the rotation-limiting protrusion, damage can be prevented from excessive rotational force. This has the practical effect of preventing erroneous operation of the digital switch.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the digital switch according to this invention, Fig. 2 is a side view of the same sectional view, and Fig. 3 is a perspective view showing the relationship between the number wheel and the stopper piece. be. 1...Case, 1c...Protrusion, 2...Number wheel,
2a... Support shaft, 2b... Recess, 2c... First gear-shaped cam part, 2d... Second gear-shaped cam part, 3...
...Stopper piece, 3a...Opening, 3b...Notch, 3c...Side wall, 4...Operation member, 4a...
Pressing part, 4c...Feeding claw, 5...Reverse prevention piece, 6
...Contact, 7...Printed board.

Claims (1)

[Claims for Utility Model Registration] A case having a rotation limiting protrusion, a recess formed on one side with a symbol marked thereon, a first gear portion formed in the recess, and a first gear portion formed in the first gear portion. It has a number wheel forming a second gear part and a gear-shaped opening that fits into the first gear part, and has a part (n-1)/n of the outer periphery cut concentrically. It consists of a disc-shaped stopper piece with a cutout portion formed on its outer periphery, and the opening of the stopper piece is fitted into the first gear portion, and the rotation limiting protrusion is fitted into the cutout portion. The digital device is characterized in that the number wheel is rotatably disposed in the case, and the side wall of the cutout portion is brought into contact with the rotation limiting protrusion to limit the rotation range of the number wheel. Switch.