JPS6316116Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a time setting mechanism in a time switch.

Conventionally, there has been a time switch in which a dial with a 24-hour time scale all around the circumference is rotated once a day, and a setter attached to an arbitrary time scale position of the dial opens and closes the contacts as appropriate via cam means. provided. The above dial is driven to rotate at a constant speed by the driving force transmitted from the electric motor to the main gear via the reduction gear mechanism, but when the dial is turned to set the current time, the main gear does not rotate together with the dial. As such, a one-way clutch mechanism is provided between the dial and the main gear.

The structure of this one-way clutch mechanism is, for example,
As shown in the figure, boss portions 1a and 2a are provided protruding from the dial 1 and the main gear 2 in opposite directions.
A coil spring 3 is wound around the outer circumference of the coil spring 3 in a crimped state, and the main gear 2 is connected to the coil spring 3.
When the coil spring 3 is rotated in the tightening direction, the dial 1 rotates as a result of the main gear 2. On the other hand, when the dial 1 is rotated in the opposite direction to the tightening direction of the coil spring 3 (when setting the current time) , main gear 2
The boss portion 2a and the coil spring 3 are configured to slip so that only the dial 1 rotates. For this reason, the outer diameter of the boss portion 1a of the synthetic resin dial 1 is normally made slightly larger than the outer diameter of the boss portion 2a of the metal main gear 2, and when setting the current time, the coil spring 3 and the boss portion 1a of the dial 1 are The inner diameter of the coil spring 3 is made smaller than the outer diameter of the boss portion 1a of the dial 1 to prevent it from slipping.

However, if the inner diameter of the coil spring 3 is made much smaller than the outer diameter of the boss portion 1a of the dial 1, there is a restriction in assembling that the coil spring 3 cannot be attached to the boss portion 1a during assembly. Therefore, the dimensional difference between the outer diameter of the boss portion 1a of the dial 1 and the inner diameter of the coil spring 3 cannot be made large, but sometimes due to dimensional variations between the two, when the dial 1 is tightened and rotated in the opposite direction, the dial 1 The boss part 1a of the dial 1 made of synthetic resin slips between the boss part 1a and the coil spring 3, and the boss part 1a of the dial 1 made of synthetic resin is damaged and worn by the end of the coil spring 3. Further, there is also a problem in dimensional accuracy between the metal main gear 2 and the coil spring 3, similar to the above, and the current situation is that the function as a one-way clutch cannot be fully demonstrated.

The present invention was created in view of these drawbacks.
The purpose of this is that the dimensional relationship between the dial boss, main gear boss, and coil spring does not require high precision, is easy to manufacture and assemble, and can fully function as a one-way clutch. The purpose of the present invention is to provide a time setting mechanism in a time switch that can be used.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are embodiments thereof.

2 to 4 show a first embodiment of the time switch according to the present invention, which generally includes a dial 10, a cam main stage 24 operated by a setter 11 mounted around the dial 10, The contact portion 27 which is opened and closed by the cam means 24 and the dial 10 are connected to one another.
It is composed of an electric motor 28 for rotating once a day.

The dial 10 has a 24-hour time scale all around its upper surface, and a setter 11 is movably mounted on the outer periphery. Further, a boss portion 12 is integrally molded on the lower surface of the dial 10 as shown in FIG. It is installed protrudingly. A boss portion 16 having approximately the same diameter as the boss portion 12 of the dial 10 and a cylindrical portion 17 having a smaller diameter than the boss portion 16 are integrally provided on the upper surface of the main gear 15. The dial 1 is inserted into the center hole 14 of the dial 10 and wound around the outer periphery of the boss portion 12 of the dial 10 and the boss portion 16 of the main gear 15 with the coil spring 19 being crimped.
0 and the main gear 15 can rotate together. A protrusion 20 is formed at the upper end of the coil spring 19 and is bent parallel to the winding axis direction.
This protrusion 20 engages between protrusions 13 provided on the boss portion 12 of the dial 10. The dial 10 can be rotated together with the main gear 15 about the main shaft 22 by fitting the center hole 18 of the main gear 15 into the main shaft 22 fixed on the base plate 21. It meshes with the output gear 29 or the final stage reduction gear of the reduction gear mechanism, and is rotationally driven in the direction of arrow A in the figure. The pointer 23 is attached to the main shaft 22 so as to face toward the center of the cam means 24.
is fixed at the top of the

The cam means 24 is provided with a set cam 25 for ON and OFF and a switch cam 26 coaxially and rotatable together.
The switch cam 26 is rotated pitch by pitch, and in synchronization with this rotation, the switch cam 26 is also rotated pitch by pitch.
The contact pieces forming part 7 are operated to open and close.

In the time switch configured as described above, to set the current time on the dial 10 to the pointer 23,
The dial 10 may be rotated in a direction opposite to the tightening direction of the coil spring 19. That is,
Since the protrusion 20 of the coil spring 19 is engaged between the protrusions 13 of the boss portion 12 of the dial 10, the inner diameter of the coil spring 19 expands as it attempts to rotate together with the dial 10, causing the lower end of the coil spring 19 to connect with the main gear. The pressing force between the dial 15 and the boss portion 16 is reduced, causing a slip, and the dial 10 can be freely rotated. On the other hand, when an attempt is made to rotate the dial 10 in the direction in which the coil spring 19 is tightened, the inner diameter of the coil spring 19 contracts, so that the coil spring 19 and the boss portion 16 of the main gear 15 do not slip. The protrusions 20 of 19 engage between the protrusions 13 of the dial 10 to prevent the dial 10 from rotating. Therefore, the boss portion 12 of the dial 10 will not be damaged by the coil spring 19 and will not wear out.

In the above embodiment, a plurality of protrusions 13 are provided on the outer periphery of the boss portion 12 of the dial 10 as engaging portions, and the protrusions 20 protruding in the axial direction of the coil spring 19 are engaged between the protrusions 13. Therefore, regardless of the positional relationship between the dial 10 and the coil spring 19, the protrusion 20 is attached to either protrusion 1.
3 to facilitate assembly. As an engaging part, a recess 13' is provided on the outer periphery of the boss part 12 of the dial 10 as shown in FIG.
3' may be engaged with an inwardly bent protrusion 20' of the coil spring 19. Also,
In the above embodiment, the boss portion 12 of the dial 10 is made of synthetic resin and the boss portion 16 of the main gear 15 is made of metal, but the boss portion 16 of the main gear 15 may be made of synthetic resin.

As is clear from the above explanation, according to the present invention, an engaging part is formed in the boss part of the dial, and the protrusion formed at one end of the coil spring is engaged with this engaging part. The boss part and the coil spring do not slip, and the boss part of the dial will not be damaged or worn even if the dial is accidentally rotated in the tightening direction of the coil spring when setting the current time. Furthermore, since the boss portion of the dial and the boss portion of the main gear are made to have approximately the same diameter, the boss portion of the main gear and the coil spring are unlikely to slip even if the dial is rotated in the tightening direction. Furthermore, since there is no need to make the inner diameter of the coil spring particularly small to match the outer diameter of the boss of the main gear, the assemblability of winding the coil spring around the boss of the dial is also easier than with conventional ones. be.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the time setting mechanism in a conventional time switch, Fig. 2 and the following show an embodiment of the present invention, Fig. 2 is a perspective view of the internal structure of the time switch, and Fig. 3 is the dial portion thereof. An exploded perspective view of
FIG. 4 is a partially enlarged perspective view thereof, and FIG. 5 is a partially enlarged perspective view of another embodiment of the present invention. 10...Dial, 11...Setoko, 12...
...Boss part, 13, 13'...Engaging part (protrusion, recess), 15...Main gear, 16...Boss part, 19...
...Coil spring, 20, 20'...Protrusion, 2
1... Board, 22... Main shaft, 23... Pointer, 24
...Cam main stage, 27...Contact section, 28...Electric motor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A main shaft fixed on a board with a time scale all around it, and a dial with a setter that can be attached and removed at any time scale position and a main gear that can be rotated. When installed, a pointer that displays the current time is fixed to the upper end of the main shaft, and the dial is rotated by the rotational force of the electric motor transmitted to the main gear, and the setter operates the cam as appropriate to open and close the contacts. In the time switch, a cylindrical boss portion having approximately the same diameter is provided in a central portion of the dial and a central portion of the main gear protruding in opposite directions, and an engaging portion is formed on the outer peripheral surface of the boss portion of the dial, A time setting mechanism for a time switch, characterized in that a coil spring having a protrusion bent at one end is wound around the outer periphery of both boss parts, and the protrusion is engaged with the engaging part. (2) The above-mentioned engaging parts are at least a pair of protrusions protruding from the outer peripheral surface of the boss part of the dial at regular intervals, and the protrusions of the coil spring are arranged between the above-mentioned protrusions along the outer peripheral surface of the boss part of the dial. A time setting mechanism in a time switch according to claim 1, characterized in that the time switch engages with each other.