JPS5952496B2 - digital switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a digital switch used as an operation switch for various numerical controls.

An example of this type of digital switch is the one shown in Figure 1.
A slider 3 of a contact mechanism is integrally attached to a dial 2 provided inside, and numbers or letters are printed at equal pitches on the outer circumferential surface of the dial 2. By pressing the dial 2, the dial 2 rotates one pitch at a time via the rook 5, and the numbers or letters of the dial 2 are displayed one pitch at a time in the display window 6 of the case 1. Alternatively, an output signal corresponding to a character is obtained from the contact mechanism.

However, as is clear from the figure, conventional digital switches have an extremely large number of parts because each component is a single unit, and the mechanism itself is complex, as well as the assembly process is complicated, especially in recent years. There is a problem in that the unit is not necessarily suitable for the trend of miniaturization as a whole.

Therefore, this invention was made in view of the above-mentioned conventional problems, and aims to simplify the mechanism itself by minimizing the number of parts that make up each part of the switch, and to provide a digital switch with better operability. It is something to do.

Hereinafter, one embodiment of the present invention will be described in detail based on FIG. 2 and subsequent figures.

In FIGS. 2 and 3, 10 is a box-shaped case body made of synthetic resin, and 11 is a disc-shaped dial that is rotatably supported on a support shaft 12 that projects inside the case body 10. On the outer peripheral surface of this dial 11, consecutive numbers corresponding to the desired number of divisions are printed at equal pitches, and these numbers are printed one pitch at a time on the case body 10 as the dial 11 rotates in division. The information is displayed on a display window 13 formed on the top surface of the .

A rook 14 is integrally formed on the back side of the dial 11 with the same support shaft 12, and a slider 15 of a contact mechanism is integrally attached to the front side by heat caulking. A fixed substrate (not shown) having contacts corresponding to the number of divisions of the dial 11 is fixed to the inner surface of the cover 16 in correspondence with the slider 15.

The slider 15 and the dial 11 contact each other on the fixed substrate and rotate in sections to switch the contact mechanism.

17.17 is located on both sides inside the case body 10,
The operating member is made of synthetic resin and is slidably disposed between the back surface of the dial 11 and the back surface of the case body 10. Support holes 10a, 10 formed on the top surface of
It protrudes from a to the outside of the case and has the function of a push button, and its lower end large diameter part is locked at the side by a protrusion 18, 18 and a support block 19 protruding into the case body 10, As a result, the sliding movement of the operating member 17.17 is restricted to only linear reciprocating movement in the vertical direction.

Reference numeral 20 denotes a tongue-shaped feed pawl for driving the rook, which is formed obliquely and integrally so as to face the rook 14 from near the upper end of the operating member 17 through a narrow slit 21;
The feed pawl 20 is configured to be elastically deformable from its mounting base through the slit 21, and its free end is guided by coming into contact with the inner side of a window-shaped guide portion 22 formed on the back surface of the case body 10. As a result, the sliding direction of the feed pawl 20 accompanying the pressing operation of the operating member 17 is regulated.

Reference numeral 23 denotes a stopper located below the rook 14 and press-fitted into the support block 19. The rotation of the rook 14 due to the pressing operation of the rook is allowed for each pitch, and at the same time, the rook 14 is engaged with the groove 14b between the adjacent pawls 14a and lJa of the rook 14.
The dial 11 is prevented from freely rotating, and the dial 11 is positioned at a predetermined divided rotation stop position.

Reference numeral 24 denotes a return spring for returning the operating member, which is supported by a protrusion 25 protruding from the center of the bottom of the case body 10 so as to be swingable about the protrusion 25 as a fulcrum.
Both free ends of the operating member 17 are engaged with locking portions 17b formed at the lower end of the operating member 17, thereby constantly urging the operating member 17 upward.

Therefore, to explain only one pitch operation of the digital switch configured as described above, when the rectangular tube portion 17a of one of the operating members 17 is pressed, the operating member 17 slides while suppressing the biasing force of the return spring 24. , At the same time, feed claw 2
0 slides using the guide portion 22 as a guide.

Then, the tip of the feed pawl 20 comes into contact with a part of the pawl 14a of the rook 14, causing the rook 14 to rotate by one pitch, and the stopper 23 is temporarily restrained as the rook 14 rotates, thereby preventing the rook 14 from rotating. Only one pitch is allowed, rook 14
The dial 11 is engaged with the next groove 14b to position the dial 11 at a predetermined division stop position.

At this time, the dial 11 is displayed on the display window 13 of the case body 10.
A number corresponding to one pitch is displayed, and the contact mechanism is switched correspondingly to obtain an output signal corresponding to the above-mentioned displayed number.

When the pressing operation of the operating member 17 is released, the operating member 1
7 is returned to its initial state by the restoring force of the restoring spring 24,
The positioned divided stop state is continuously maintained.

In addition, even when the other operating member 17 is pressed, the dial 11 only reverses, and the same operation as described above is performed, and when one operating member is operated, the other operating member does not interfere with the operation. It's not a thing.

As is clear from the above description, the digital switch according to the present invention functions as a feeding mechanism for dividing the dial into rotations.
An operation member slidably attached to the case body has a protruding feed claw whose tip part rotates elastically, and a guide part is formed on the case body to guide the feed claw, and the operation member is slidably attached to the case body. The member and the feed pawl are integrally molded, and the feed pawl itself has an elastic function, so there is no need for a special elastic member, and the operation member can be manufactured and assembled by simply attaching it to the case body. In addition, since the feed claw is guided by a guide portion formed in the case body, smooth operation can be performed without requiring any special parts.

In addition, with the digital switch of the present invention, with only one pitch operation, that is, a pressing operation, the position is immediately determined by the action of the switch/flange, and the number or character is displayed, so there is no so-called intermediate stop state, and the number or character is displayed. The display can be easily checked and operated, and the number of parts is smaller than that of conventional switches, making it possible to reduce the size of the switch as a whole.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the internal structure of an example of a conventional digital switch, FIG. 2 is an explanatory diagram showing the internal structure of a digital switch according to the present invention, and FIG. 3 is an exploded perspective view thereof. 10...Case body, 11...Dial, 14...Rook, 15...Slider, 1
7...Operating member, 20...Feeding claw, 2
2... Guide part, 23... Curved stopper, 24...
...Return spring.

Claims (1)

[Claims] 1 Disk-shaped characters that are rotatably supported in divisions within the case body and have a slider of a contact mechanism, and on the outer circumferential surface are numbers or letters corresponding to the predetermined number of divisions printed at equal pitches. A dial, a rook integrally formed with the same axis on one side of the dial and for imparting divisional rotation to the dial, and a rook that is rotated one pitch at a time by an external pressing operation. It is equipped with a feeding mechanism that rotates the case in parts, and the feeding mechanism is composed of an operating member slidably attached to the case body, a return spring for the operating member, and a stopper that engages with the rook to position the parts in separate positions. , the operating member is integrally formed with a protruding tongue-like feed pawl whose distal end is elastically rotatable, and this feed pawl engages with the rook, and the case body is provided with the feed pawl that is elastically rotatable. A digital switch equipped with a guide section.