JPS609753Y2 - Watch switch mechanism - Google Patents

Abstract

1525060 Electronic watches DAINI SEIKOSHA KK 22 Dec 1976 [29 Dec 1975] 53535/76 Heading G3T [Also in Division H1] An electrical switch comprises a rotatable cam 8 having a projection 9' engageable with a contact spring 13 and a projection 9 engageable with a cam spring 10, the arrangement being such that when the cam 8 is rotated by drive means 4 the cam spring 10 is flexed by the cam projection 9 and then moves under its own resilience to apply a rotational force to the cam 8 causing the other projection 9' to move the contact spring 13 into contact with a fixed contact 18, 19. The switch is mounted in an electronic watch having an axially movable and rotatable stem 4 mounting a clutch wheel 1 and a freely rotatable pinion 2 which meshes with a transmission wheel 5 rotatably mounted together with the cam 8 on a pin 6. A pin and slot 16, 17 lost motion mechanism is provided between the transmission wheel 5 and cam 8. When the stem 4 is axially moved to drivingly connect it to the clutch wheel 1, the clutch wheel 1 meshes with the pinion 2 whereby rotation of the stem 4 in one direction causes clockwise rotation of the cam 8 after the lost motion 16, 17 has been taken up. The cam projection 9 is moved past a projection 10a of the spring 10 to cause the latter to flex and then impart a rotational force to the cam 8 which causes the other cam projection 9 to move the contact spring 13 relative to a contact 18. If the cam 8 is rotated anti-clockwise by the stem 4, the cam projection 9' engages the cam spring 10 and the cam projection 9 moves the contact spring 13 into engagement with another fixed contact 19. The contacts 18, 19 are connected to circuits which control time correction and resetting.

Description

[Detailed Description of the Invention] The present invention relates to a switch mechanism for a wristwatch that adjusts the seconds of an electronic timepiece.

In the conventional switch mechanism of watches, the notch of the winding stem engaged the protrusion of the cam, the winding stem was turned, and the spring was operated by the cam. had the disadvantage of being thick, and could not obtain the smartness of the watch.

The present invention eliminates the drawbacks of the conventional clock, and has a rectangular gear that engages the transmission wheel and the transmission wheel.The transmission wheel is meshed with the transmission wheel at right angles to the transmission wheel, and the transmission wheel and transmission wheel are connected to a cam on the same axis as the transmission wheel. By transmitting the rotation of the wheel, the winding diameter does not need to be particularly thick, and the thickness of the watch can be made thinner.

Embodiments of the present invention will be described with reference to the drawings.

Reference numeral 1 is a screw wheel that slides on the square shaft portion 4a of the winding stem 4 and rotates together with the square shaft portion 4a, and 2 is a screw wheel that meshes with the screw wheel through rectangular teeth 3, and is supported by the round shaft portion 4b of the winding stem 4. has been done.

Reference numeral 5 indicates a transmission wheel which is engaged with the stopper wheel 2 and has an elongated hole (or protrusion) attached to the base plate 7 with a pin 6 in a direction perpendicular to the axial direction of the winding stem 4; It is a cam coaxially mounted on the same shaft, and has convex portions 9 and 9 on both ends of the cam.
', and is rotated relative to the rotation of the transmission wheel 5 via an elongated length (or protrusion).

Reference numeral 10 denotes a cam spring whose base is attached to the base plate 7' with pins 11 and 12, and a protrusion l on the free end of this cam spring.
ea is located within the rotation locus of the convex portion 9°9' of the cam 8.

Reference numeral 13 denotes a conductive switch spring, and one end of this switch spring is clamped in a groove of a fixing member 15 which is rotatably attached to a pin 14 set up on another board 7'.

The other end of the switch spring 13 is connected to the convex portion 9 of the cam 8.
' are opposed so as to engage or disengage.

The transmission wheel 5 is provided with an elongated projection (or projection) 16, and the cam 8 is provided with a projection (or projection) 17 that engages with the elongated hole (or projection) 16.

When the winding stem 4 is rotated, the stopper wheel 1, the stopper wheel 2 and the transmission wheel 5 that mesh with the stopper wheel 1 are rotated in conjunction with each other.

Since the transmission wheel 5 has an elongated hole 16, when the transmission wheel 5 rotates as much as possible, the protrusion 17 of the cam 8 engages with one end of the elongated hole 16, causing the cam 8 to move clockwise around the pin 6. As the cam rotates, the protrusion 9 of the cam pushes up the free end of the cam spring 10 against the elasticity of the cam spring, and at the same time the protrusion 9 passes the protrusion lea of the cam spring, the cam spring 10 returns to its original position due to the return force of the cam spring 8, and the cam 8 is rapidly rotated within the length range of the elongated hole 16.

When the cam 8 rotates clockwise, the convex portion 9' presses the switch spring 13 to the left, contacts the terminal pin 18, and leaves the switch spring 13 to return to the center.

Further, when the cam 8 is rotated counterclockwise, the convex portion 9' presses the switch spring 13 to the right and contacts the terminal pin 19, and the switch spring 13 is released and returns to the center.

These terminal pins 18 and 19 are each connected to a clock electronic circuit (logic), and are used to perform two or more different operations such as time correction and reset by opening and closing the switch.

As mentioned above, this invention eliminates the need to increase the winding diameter by interlocking the tension wheel and transmission wheel, which are rotated by the winding stem, with rectangular teeth on the winding shaft. By arranging them at right angles and interlocking them, the transmission wheel, cam, and cam spring are arranged in a flat plane, which allows the watch to be made thinner.

Furthermore, the return force of the cam spring causes the cam to move rapidly within the range of the elongated hole of the transmission wheel, and during this rapid movement, the switch spring is actuated by the other protrusion, which greatly prevents chattering in the switch section compared to conventional structures. , operation is accurate and effective.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of the present invention, and FIG. 2 is a longitudinal sectional side view of the same. 1: Tsuzumi wheel, 2: Kichi wheel, 3: Rectangular tooth, 4: Winding stem, 4
a: square shaft of winding stem, 4b = round shaft of winding stem, 5: transmission wheel, 6: pin, 7: board, 8: cam, 9.9': protrusion of cam, 10: cam spring, 10a : Protrusion of cam spring, 11,
12: pin, 13: 4' switch spring, 14: pin, 15: fixing member, 16: long transmission wheel (or protrusion)
, 17: Cam protrusion (or long), 18, 19: Terminal pin.

Claims (1)

[Scope of utility model registration request] A thread wheel located on the winding stem axis and rotated by the winding stem and having rectangular teeth; a threaded wheel also located on the winding stem and meshing with the rectangular teeth; and a threaded wheel having an elongated hole and flat against the main plate so as to mesh with the threaded wheel. A transmission wheel is arranged coaxially with the transmission wheel, a protrusion that engages with the elongated hole, and a cam having convex portions at both ends. A switch mechanism for a wristwatch consisting of a cam spring that applies a repulsive rotational force to the cam, a switch spring that is actuated almost simultaneously by the other protrusion of the cam, and a switch terminal that establishes electrical continuity with the switch spring.