JPH0534053Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a dial return device applied to, for example, a combination lock or a counter having a zero return mechanism.

<Prior Art> As this type of dial return device, one having the structure shown in FIG. 3 is used.

This device has a dial 5 with numbers on the outer circumference.
An eccentric cam 51 is provided on the side surface of the housing, and a push button 6 is provided on the housing. Said pushbutton 6
There is always a pushbutton 6 between the and eccentric cam 51.
A spring-type operating arm 7 is provided which pushes back the eccentric cam 51 by pushing the push button 6.

The eccentric cam 51 is formed into a substantially heart shape having two symmetrically curved circular cam surfaces 52, and a convex portion 53 forming a connecting portion between the two circular cam surfaces 52.
The center of rotation of the dial 5 is set near the recess 54 on the line connecting the recess 54 and the recess 54, so that when the recess 54 faces the actuating arm 7, the number "0" on the outer periphery of the dial 5 is located at the reference position. It's getting old.

<Problems to be Solved by the Invention> However, with the above-mentioned conventional configuration, especially when the diameter of the rotating shaft on which the dial 5 is pivoted is relatively large with respect to the diameter of the dial 5, the eccentric cam Since the amount of eccentricity of the dial 51 is limited, the angle of inclination of the circular cam surface 52 with respect to the actuation arm 7 cannot be adjusted, resulting in the inconvenience that the diameter of the dial 5 cannot be reduced.

Therefore, this idea made it possible to reduce the diameter of the dial by forming a gear on the side of the dial and engaging it with a transmission gear, and configuring an eccentric cam on this transmission gear, and also to return the dial with a small push operation. It is an object of the present invention to provide a dial recovery device that can perform a dial recovery.

<Means for Solving the Problems> In order to achieve the above object, this invention has a plurality of rotary shafts fixed to a rotating shaft, numbers and a rotating operation part formed on the outer circumferential surface, and gears formed on the side surface. Between the dial, a transmission gear wheel that meshes with the gears of each dial and has an integral eccentric cam on the side, a push button provided in the housing, and the push button and the eccentric cam of each transmission gear wheel. The dial return device is constituted by an operating arm that normally pushes back the push button and rotates the transmission gear wheel by pushing the cam surface of the eccentric cam by pressing the push button.

<Function> When turning the dial to set a specific number,
The gear on the side of the dial rotates the transmission gear wheel. When the push button is pressed, the actuating arm presses the cam surface of the eccentric cam and rotates the dial back via the transmission gear wheel. In this case, since the eccentric cam is integrally provided on the transmission gear wheel that meshes with the gear of the dial, the diameter of the dial can be made small, and the dial can be returned to its original state with a small push operation of the push button.

<Embodiment> The drawing shows a dial return device according to an embodiment of this invention.

This dial return device includes a plurality of dials 1 which are fixed to a rotating shaft 10, numbers (not shown) and a rotary operation part 11 are formed on the outer peripheral surface, gears 12 are formed on the side surface, and the gears of each dial 1. A transmission gear wheel 2 is provided opposite to the eccentric cam 21 of each transmission gear wheel 2, and the eccentric cam 21 is pressed against the eccentric cam 21 to rotate the transmission gear wheel 2. It is composed of an operating mechanism 3 that returns the dial 1 to its original state.

The transmission gear wheel 2 is set to have twice the number of teeth as the gear 12 provided on the dial 1, and the eccentric cam 21 is integrally provided on the side surface.

The horizontal and vertical centers of the eccentric cam 21 coincide with the center of the transmission gear wheel 2, and two circular cams 22a and 22b are formed symmetrically on both sides of the central support shaft 20. . Therefore, the operating mechanism 3 is connected to any one of the circular cam surfaces 22a.
Or press 22b, transmission gear wheel 2 is 1/2
When rotating, the dial 1 rotates once and returns to its original state.

The operating mechanism 3 includes a push button 31 provided on the housing, and an actuation arm 32 provided between the push button 31 and the eccentric cam 21 of each transmission gear wheel 2. The actuation arm 3
2 normally pushes back the push button 31, but when the push button 31 is pressed, either of the opposing circular cam surfaces 22a, 22b is pushed and the transmission gear wheel 2 is rotated.

When each dial 1 is turned to set a predetermined number, the side gear 12 of each dial 1 rotates the transmission gear wheel 2, and the circular cam surfaces 22a and 22b of the eccentric cam 21 are displaced. Each dial 1
When the pushbutton 31 is pressed in order to restore the
2b to rotate, and each dial 1 is rotated back to its original state via each transmission gear wheel 2.

<Effects of the invention> As mentioned above, this invention has an eccentric cam integrated on the side of the transmission gear wheel that meshes with the gear on the side of the dial, so the dial can be made small in diameter, and the dial can be adjusted with a small push operation of the pushbutton. This has the effect of simplifying the configuration and achieving the purpose of the invention, such as making recovery possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the use of a dial return device according to an embodiment of this invention, Fig. 2 is a side view showing an enlarged part of Fig. 1, and Fig. 3 shows a conventional example. It is an explanatory diagram. DESCRIPTION OF SYMBOLS 1... Dial, 10... Rotation shaft, 11... Rotation operation unit, 12... Gear, 2... Transmission gear wheel, 21... Eccentric cam, 6... Push button, 7...
...actuation arm.

Claims (1)

[Claim for Utility Model Registration] A plurality of dials fixed to a rotating shaft, with numbers and a rotating operation part on the outer circumferential surface, and gears on the side, and a dial that meshes with the gears of each dial and is eccentric on the side. A transmission gear wheel integrally provided with a cam, a push button provided in the housing, and an eccentric cam of each transmission gear wheel are provided between the push button and the eccentric cam of each transmission gear wheel. A dial return device consisting of an operating arm that rotates a transmission gear wheel by pushing the cam surface of an eccentric cam through a pressing operation. The dial return device according to claim 1, wherein the eccentric cam has two symmetrically curved cam surfaces on both sides. The dial return device according to claim 1, wherein the gear ratio between the gear of each dial and the transmission gear wheel is set to 1:2.