JPS6210909Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a contact mechanism used for adjusting the time display of a watch.

Conventionally, in a contact mechanism that corrects the display of advance or lag in electronic digital watches, for example, a single cam with a protrusion on the outer periphery is attached to the rotating shaft, and a cam that is opposite to this cam is attached to the wiring board. Two fixed switch terminals are provided, and a switch spring whose both ends are fixed to the rotating board is interposed between the fixed switch terminal and the cam to detect forward and reverse rotation of this one cam. (For example, Japanese Patent Application Laid-Open No. 1973-
Publication No. 92076).

However, in this conventional technology, when the fixed switch terminal and the movable switch spring come into contact, the cam presses near the fixed switch terminal, making it very difficult to control component precision and contact pressure, and it is difficult to control the part accuracy and contact pressure. Moreover, since the switch spring is a non-static spring, there is a problem that the opening and closing operation of the switch becomes uncertain.

The present invention eliminates the above-mentioned drawbacks, and an embodiment will be described below with reference to the drawings.

In FIG. 1, a time display window 1a is provided on the front surface of an exterior case 1, which serves as the frame of a portable digital watch, for example, and a rear panel 3 fixed to the end of a rear panel stem 2 is mounted on a side plate 1b. It is exposed to the outside so that it can be operated.

As shown in FIGS. 2 to 4, the reuse stem 2 is pivotally supported in an inner case 4 disposed within the outer case 1 so as to be rotatable and movable in and out of the case. A collar-shaped stopper part 2a for preventing escape is provided approximately in the center of the reuse stem 2, and a click part 2b and a stopper part 2 for preventing over-pushing are provided at a certain distance to the right of the stopper part 2a.
c are formed respectively. The stopper parts 2a and 2c have the same diameter, but the click part 2b has a smaller diameter than the stopper part. In addition, the stopper part 2
a, 2c and the click portion 2b are provided integrally with the reuse stem 2, but they may be constructed as separate members from the reuse stem. The right end portion of the stopper portion 2c is joined to the base of the reuse 3 within a hole in the side plate 1b.

Further, two switch actuating cams 5 and 6 are loosely fitted into the rear stem 2 on the left side of the stopper portion 2a in a non-rotatable manner. Although the operating cams 5 and 6 are integrally formed in the example shown in the fifth and sixth figures, they may be independent. As shown in FIGS. 7 and 8, a plurality of projections 5a, 6a, . The protrusions 5a correspond to the protrusions 6a with a phase difference of a constant angle θ. As shown in FIGS. 2 and 3, actuation contact pieces 7 and 8 intersect with the actuation cams 5 and 6, and are in elastic contact with each cam.

As shown in FIGS. 5 and 6, the actuating contacts 7 and 8 are provided with engaging portions 7a and 8a, and one of the engaging portions 7a
is attached to the protrusion 5a of the actuating cam 5, and the other engaging portion 8
a can come into contact with the protrusion 6a of the actuating cam 6. Therefore, the actuating contacts 7, 8 can vibrate as the actuating cams 5, 6 rotate.

The rear end of one of the operating contact pieces 7 is positioned by a support piece 7b inserted into a hole in the circuit board 9, and is fixed to the circuit board with solder. This rear end portion is electrically connected to a copper foil 10 which is an electrode portion provided on the circuit board 9. The tip of the operating contact piece 7 can be brought into contact with and separated from a copper foil 10a, which is an electrode part provided on the circuit board 9. Similarly to the operating contact piece 7, the other operating contact piece 8 has its rear end fixed in a conductive state with the copper foil 10b (FIG. 2) on the circuit board 9, and its tip end is in contact with the copper foil 10a. It is possible to separate.

In addition, a click spring plate 11 is attached to the middle case 4, as shown in FIGS.
is arranged in a direction perpendicular to this reuse truth. Both sides of the click spring plate 11 are inserted between the holding parts 4a and 4b of the inner case 4 so that they can be inserted and removed. The click spring plate 11 has spring parts 11b and 11c formed on the left and right sides by a long hole 11a bored in the center, and these spring parts are orthogonal to the reuse stem 2. One of the spring parts 11b presses the protrusions 6a of the actuating cam 6 with its lower surface to a limit that does not hinder the rotation of the actuating cam, thereby clicking in the direction of rotation. The other spring portion 11c has a click claw 11d protruding from its lower surface, and normally presses against the click portion 2b of the crown 2 located on the inside of the click claw (on the left side in FIG. 3). Spring part 1
1c applies a spring force to the click portion 2b, which moves with the movement of the crown stem 2, to the extent that it can overcome the click pawl 11d, and clicks in the axial direction of the crown stem. One stopper part 2a can come into contact with the inner end face (left end face in FIG. 3) of the spring part 11c of the click spring plate 11, and the other stopper part 2c can come into contact with the outer end face of this spring part. It is.

Furthermore, near the tip of Reuse stem 2, there are second and third
As shown in the figure, a contact plate 12 is fixed to a circuit board 9 at one end thereof. The tip of the contact plate 12 comes into contact with and separates from the shaft 13 erected on the circuit board 9 as the reuse stem 2 moves forward and backward, thereby opening and closing the switch. This switch is used in mode change switches such as alarm switches and stopwatch switches, and lighting lamp switches. In the illustrated example, the alarm switch is shown in an open state, and the alarm time can be adjusted with the switch closed. 14 is a buzzer.

Next, the operation of the present invention will be explained.

The present invention has two different switch functions, for example, one for advancing the time display and the other for retarding it. First, we will explain the effect of advancing the time.

In the states shown in FIGS. 2 and 3, for example, when the reuse 3 is rotated clockwise, the operating cams 5 and 6 rotate in the direction of the arrow in FIG. 5 (counterclockwise). At this time, the projections 6a of the operating cam 6 are connected to the click spring plate 11.
The actuating cams 5, 6 move while slightly lifting the spring portion 11b against the spring force of the spring portion 11b.
rotates intermittently. With this rotation, the actuating contact pieces 7, 8 move the protrusions 5a, . . . of the respective actuating cams 5, 6. 6a
... vibrates, and the tip repeatedly comes into contact with and separates from the copper foil 10b, and each switch is repeatedly opened and closed. At this time, since the protrusions 5a and 6a correspond to each other with a certain phase difference, for example, when the switch on the operating contact 8 side is closed as shown in FIG. The opening and closing of the switches are staggered at regular intervals so that the switch on the 7 side is closed.

As a result, pulse signals having different positions are generated, and the time is corrected.

On the other hand, if the crown 3 is rotated in the opposite direction, the crown 2 rotates while being clicked clockwise, so that the switch on the actuating contact piece 8 side is closed only by the actuating piece 7.
It is performed slightly later than the closing of the side switch,
If the reuse 3 continues to rotate, the switch will open and close with a certain phase difference, thereby correcting the time delay. When adjusting the alarm time, pull the Reuse 3 in the direction of the arrow in Figures 2 and 3. Since the Reuse stem 2 moves to the right as shown by the chain line, the pressure on the contact plate 12 is released at the tip. , the contact plate contacts the shaft 13 and the switch closes. At the same time, the click portion 2b moves over the click pawl 11d of the click spring plate 11 to the right. Since the stopper portion 2a eventually comes into contact with the inner end surface of the spring portion 11c, even if the reuse stem 2 is further pulled, further movement is restricted and the reuse stem is prevented from coming off.

Note that since the operating cams 5 and 6 are loosely fitted into the rear stem 2, the position of the operating cams is not affected by the movement of the rear stem. Therefore, the operating contact pieces 7 and 8 are maintained in elastic contact with the protrusions 5a and 6a of the operating cams 5 and 6, respectively.

Therefore, if the reuse 3 is rotated clockwise, the alarm time is adjusted to advance in the same manner as in the case of time adjustment described above, and when it is rotated to the left, the alarm time is adjusted to be delayed. After the correction operation is completed, push in Reuse 3 to release the click part 2 of Reuse 2.
b climbs over the click pawl 11d of the spring portion 11c, returns to its original position, and is clicked. At this time, the stopper portion 2c comes into contact with the outer end surface of the spring portion 11c, so that the reuse stem 2 is prevented from being pushed in too much. Note that the contact mechanism according to the present invention is not limited to those related to watches, but can also be used for timers and other measuring devices.

As explained above, according to the present invention, it is possible to reliably open and close the switch continuously at regular intervals,
This makes it possible to both correct different switching effects, for example the advance or lag of the time display, and also facilitates manufacturing and assembly.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of the outer case of the watch, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is a sectional view taken along the line of Fig. 2, and Fig. 4 is a sectional view taken along the line of Fig. 2.
The figure is Fig. 3 - Line sectional view, Fig. 5 is Fig. 3 -
6 is an explanatory diagram showing the relationship between the click wheel and the operating contact piece, FIG. 7 is an enlarged front view of the click wheel, and FIG. 8 is a sectional view taken along the line taken in FIG. 7. 2... Reuse stem, 5, 6... Switch operating cam, 5a, 6a... Projection, 6, 7... Operating contact piece.

Claims (1)

[Claims for Utility Model Registration] Two switch actuating cams having the same shape on one rotating shaft having a reuse fixed to the end thereof, two actuating contact pieces that come into elastic contact with the switch actuating cams, and the above actuating contact pieces. and two contacts that move toward and away from each other constitute two switches, and the two switch actuation cams have a plurality of protrusions formed at equal intervals with a certain angle phase difference from each other, and perform two different switch actions. A contact mechanism for correcting the display of a watch, etc., characterized in that the two switches are opened and closed continuously at regular intervals by selectively rotating the rotation shaft in both forward and reverse directions. .