JP2904475B2 - Clock indication mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm clock which emits an alarm sound at a set time, and more particularly, to an alarm mechanism for generating an alarm signal for generating an alarm sound, wherein an indicator hand is moved in both forward and reverse directions. The present invention relates to a guide mechanism capable of rotating.

[0002]

2. Description of the Related Art Conventionally, a guide mechanism for setting the sounding time of an alarm sound has used a guide cam which rotates once in 12 hours in accordance with the rotation of an hour hand wheel, and a guide contact piece is provided in a notch of the guide cam. When falling, the reference contact is closed and a reference signal is output. In the conventional general guide mechanism, the direction of rotation of the guide is limited to one direction due to the notch shape of the guide cam, and when the guide hand is adjusted and set at the alarm time, the rotation direction of the guide needle is limited to one direction. There were many things that could be done.

However, if the reference hand rotates in one direction as described above, it may be necessary to rotate the reference hand nearly one turn when setting the alarm time.
A guide mechanism is used in which the guide hand can be rotated forward and reverse and the alarm time can be set by setting the amount of rotation of the guide hand to 180 degrees or less when setting the alarm time.

In order to enable the guide needle to rotate in both the forward and reverse directions and to set the position where the guide contact falls into the notch of the guide cam to be exactly a fixed position, a structure generally having a complicated structure is used. Many, but with a relatively simple structure that allows the standard needle to rotate forward and backward, and closes the standard contact at the correct set time, as shown in Fig. 6, and is integrated with the standard shaft 11 that attaches the standard needle to the tip. Guide wheel 21 and hour hand wheel 23
(See, for example, Japanese Utility Model Publication No. 61-42145).

In this guide mechanism, as shown in FIG. 7, when the cam claw 41 of the hour hand wheel 23 is located in the cam groove 51 of the guide wheel 21, the guide wheel 21 is moved by the elastic body 63 shown in FIG. The movable contact 61 formed at the tip of the elastic body 63 comes into contact with the fixed contact 65, and when the hour wheel 23 rotates in the forward direction, the inclined portion 45 of the cam claw 41 and the cam are rotated. The guide wheel 21 is separated from the hour hand wheel 23 by the front inclined portion 53 of the groove 51, and the movable contact 61 and the fixed contact 65 are separated.

FIG. 6 shows a four-axis movement having a minute hand shaft 15 and a second hand shaft 17 which are coaxial with the hour hand shaft 13. A movement between the second hand wheel 27 and the minute hand wheel 25 is shown in FIG. A third wheel (not shown) is arranged, and a minute wheel is arranged between the minute hand wheel 25 and the hour hand wheel 23. In this guide mechanism, when setting the reference hand by rotating the reference wheel 21 in the reverse direction of the hour hand wheel 23 by the reference wheel 29 attached to the reference knob shaft 19, the cam groove 51 provided in the reference wheel 21 is provided. The cam pawl 41 of the hour wheel 23 moves relatively in the forward direction with respect to the cam wheel 41. The cam pawl 41 is displaced from the cam groove 51 by the front inclined portion 53 of the cam groove 51 and the inclined portion 45 of the cam pawl 41. The reference wheel 21 is rotated so as to be pushed out, and the reference hand is rotatable so that the rotation is not restricted by the influence of the cam mechanism.

When the reference hand is rotated in the same direction as the normal rotation of the hour hand, the cam groove is formed in the vertical wall 43 of the cam pawl 41.
The rear inclined portion 55 of 51 is in contact with the reference vehicle 21 by the rear inclined portion 55.
Rotates in the normal rotation direction of the hour wheel 23 so as to be separated from the hour wheel 23 against the force of the elastic body 63. At this time, the guide set plate 31 inserted between the hour hand wheel 23 and the reference wheel 21 positions the cam pawl 41 in the through hole 33 of the guide set plate 31, and the hour hand wheel
It is stopped integrally with 23 (rotating at a very low speed).

[0008] In this manner, the cam pawl 41 is moved to the rear inclined portion 55.
8, the positioning pin 35 of the guide set plate 31 comes into contact with the rear end of the play hole 59 of the guide wheel 21, as shown in FIG. By rotating, the cam pawl 41 of the hour hand wheel 23 is positioned on the surface of the reference set plate 31, and the reference time can be set to a predetermined time by the reference hand while the reference set plate 31 is rotated together with the reference wheel 21. .

When the hour wheel 23 sequentially rotates and approaches the alarm set time, as shown in FIG.
When the concave portion 47 of the guide engages with the convex portion 37 of the guide set plate 31, rotates the guide set plate 31 together with the hour wheel 23, and when the positioning pin 35 contacts the front end of the play hole 59, the guide set plate 31 Car 21
When the hour wheel 23 is further rotated, the hour wheel 23 is rotated.
As shown in the figure, the guide wheel 21 is dropped into the cam groove 51 through the through hole 33 of the guide set plate 31,
23, when the vertical wall 43 of the cam pawl 41 reaches the position of the through hole 33 of the guide set plate 31,
In addition, the reference wheel 21 is suddenly approached in the direction of the hour wheel 23 by the elastic body 63, and the movable contact 61 formed at the tip of the elastic body 63 is brought into contact with the fixed contact 65 to close the reference contact.

[0010]

As described above, the guide mechanism provided with inclined portions on both the front and rear sides of the cam groove using the guide set plate which rotates in a predetermined range while being integrated with the guide wheel is a guide needle. Can be rotated forward and reverse, and the reference contact can be accurately closed at a predetermined relative position between the reference wheel and the hour wheel.

However, the guide set plate must be moved only within a certain range with respect to the reference vehicle, and the distance between the through hole provided in the guide set plate and the positioning pin is set in front of the cam groove and the play hole. It is necessary to mold and manufacture guide cars and guide set plates with high precision so as to match the distance to the wall and the rear wall. The guide plate may not be able to be moved to match the cam groove of the car.If the convex part is enlarged, when the cam pawl of the hour hand wheel contacts the convex part, a large resistance is given to the rotation of the hour hand wheel. However, the rotation of the hour hand wheel is hindered, and there has been a drawback that the manufacture and assembly of the guide mechanism cannot be performed simply and easily, including the manufacture of the guide set plate and the adjustment of the elastic force for pressing the guide wheel against the hour wheel.

[0012]

According to the present invention, an indicator wheel and an hour wheel are arranged coaxially, and the indicator wheel is pressed in the direction of the hour wheel by an elastic body, and a projection provided on the indicator wheel or the hour wheel is provided. When the part is fitted into the cam hole provided on the hour hand wheel or the indicator wheel, the indicator wheel moves to the hour hand wheel side and closes the indicator contact. An inclined portion is provided in at least one of the rolling directions, and a helical tooth is formed on the outer circumference of the reference wheel, and a helical tooth meshing with the helical tooth of the reference wheel is formed on the outer circumference of the reference wheel. .

[0013]

According to the present invention, since the inclined portion is provided in the normal rotation direction of at least one of the reference projection and the cam hole, the reference projection can be removed from the cam hole when the hour wheel rotates forward. it can. Also, when the reference wheel is rotated in the reverse direction of the hour wheel, the guide protrusion can be removed from the cam hole by the inclined portion provided in at least one of the guide wheel and the cam hole in the normal direction. .

When the reference wheel is rotated in the normal direction of rotation of the hour hand, since the reference wheel and the reference wheel are meshed with the helical teeth, the reference protrusions are fitted into the cam holes and are used as guides. When the rotation of the vehicle is stopped, a helical tooth is used to apply a component force in the axial direction to the reference wheel, and the reference wheel can be moved in the axial direction to remove the reference protrusion from the cam hole.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an embodiment of a guide mechanism according to the present invention has a guide shaft 11, an hour hand shaft 13 and a minute hand shaft 15 arranged coaxially, and the minute hand shaft 15 is controlled by a minute hand wheel 25 for 60 minutes. The hour hand shaft 13 is rotated once in 12 hours by the hour wheel 23, and the indicator wheel 21 is urged in the direction of the hour wheel 23 by the elastic body 63, so that the hour hand wheel 23 and the indicator wheel 21 move relative to each other. When the position becomes a predetermined position, the reference wheel 21 is moved in the direction of the hour hand wheel 23 by the elastic body 63 so that the movable contact 61 comes into contact with the fixed contact 65 to close the reference contact. As shown in FIG. 4, the guide wheel 21 and the guide wheel 29 are formed by helical teeth.

FIG. 1 shows a four-hand coaxial structure in which a second hand shaft 17 is provided coaxially with the hour hand shaft 13 and the minute hand shaft 15 and the second hand shaft 27 is rotated once by the second hand wheel 27 in 60 seconds. Numeral 21 designates a rotation adjustment by a reference wheel 29 attached to a reference knob shaft 19. 2 and FIG.
As shown in FIG.
And a cam hole 71 into which a guide projection 81 can be inserted is provided on a side surface of the reference wheel 21 facing the hour wheel 23.

The guide projection 81 has a flat portion 87 at its tip.
The end of the hour hand wheel 23 on the forward rotation direction is an inclined portion 85,
The end of the hour wheel 23 on the reverse rotation direction side is a vertical wall 83, and the cam hole 71 provided on the reference wheel 21 is also an inclined portion 75 at the forward rotation side end of the hour wheel wheel 23, and the hour wheel 23 The end on the reverse direction side of the cam hole is formed as a vertical wall 73, and an appropriate flat portion 77 is formed.
The reference projection 81 can be stored in the 71.

Therefore, the rotation of the hour wheel 23 causes the reference projection
When 81 reaches the position of cam hole 71, guide projection 81
As shown in FIG. 1, the reference wheel 21 is an elastic body.
Since the guide wheel 81 is urged in the direction of the hour wheel 23 by 63, the guide protrusion 81 is fitted into the cam hole 71 so that the guide protrusion 81 is housed in the cam hole 71, and the guide wheel 21 is , And the reference contact is closed by moving the movable contact 61 to the fixed contact 65.

When the rotation of the hour wheel 23 continues, the guide projection 81 and the end portions of the cam holes 71 in the forward rotation direction of the hour wheel are inclined portions 75 and 85, respectively. The guide projection 81 is pushed out of the cam hole 71 by the inclined portion 75 of the cam hole 71 and the guide wheel 21 is elastically moved so that the guide projection 81 is positioned on the side surface of the guide wheel 21 as shown in FIG. Body 63
Away from the hour hand wheel 23 against the force of
The rotation of the hour wheel 23 is continued with the state apart from the state 65.

Similarly, when the indicator hand is rotated in the direction opposite to the rotation direction of the hour hand to set the alarm time, the indicator protrusion 81 provided on the hour hand wheel 23 is similarly formed by the rotation of the indicator wheel 21 by the cam hole 71. When fitted to the guide projection 81 or the inclined portion of the cam hole 71
The reference projection 81 is disengaged from the cam hole 71 by 75 and 85, so that the hour wheel 23 of the reference wheel 21 can be freely rotated in the reverse direction.

When the reference wheel 21 is rotated in the normal direction of the hour hand wheel 23 to set the alarm time, when the reference projection 81 is fitted into the cam hole 71 as shown in FIG. The vertical wall 83 of the reference projection 81 and the vertical wall 73 of the cam hole 71 come into contact with each other, so that the rotation of the reference wheel 21 is prevented. in this way,
When a resistance is applied to the rotation of the reference wheel 21, the reference wheel 21 and the reference wheel 29 are formed by the helical teeth.
When the guide wheel 29 is strongly rotated, the guide wheel 21 moves in the axial direction against the force of the elastic body 63, and the guide protrusions are formed. When 81 comes off the cam hole 71, the reference wheel 21 resumes rotation in accordance with the rotation of the reference alignment wheel 29.

Therefore, when the hour wheel 23 rotates forward or the indicator wheel 21 is rotated in the reverse direction of the hour wheel 23, the cam 85 is provided by the inclined portion 85 provided on the reference projection 81 and the inclined portion 75 provided in the cam hole 71. hole
The guide projection 81 fitted to 71 can be removed from the cam hole 71, and when the reference wheel 21 is rotated in the forward direction of the hour hand wheel 23 by the reference alignment wheel 29, the reference projection 81 is fitted to the cam hole 71. When the rotation of the reference wheel 21 is stopped by fitting, the reference wheel 29
The guide wheel 21 moves by receiving a force in the axial direction by the helical teeth formed on the outer periphery of the reference wheel 21, and the rotation of the reference wheel 21 can be continued by removing the reference projection 81 from the cam hole 71.

In the above embodiment, the inclined portion 75 is provided in the cam hole 71 and the inclined portion 85 is also provided in the reference projection 81. However, the inclined portion 75 is provided only in the cam hole 71, The inclined portion 85 may be provided only on the protrusion 81. Also, guide car 21
When the guide projection 81 is provided on the hour wheel and the cam hole 71 is provided on the hour wheel 23, the guide mechanism can be operated in the same manner.
Is provided as a through hole in the reference wheel 21 or the hour wheel 23, and the flat portion 77
In some cases, the cam hole 71 does not have the hole.

Therefore, in this embodiment, the reference wheel 21 can be rotated forward and reverse only by using the cogwheels of the reference wheel 21 and the reference wheel 29, so that the reference mechanism can be realized with a small number of parts. It has the advantages that it can be configured, facilitates the molding and assembly of parts, has a small number of parts, and facilitates downsizing of the timepiece. Then, as another embodiment, as shown in FIG. 5, the reference wheel 29 can be slid in the axial direction of the reference knob 19 by a spline 95,
The movement in the axial direction is restricted by a locking ring 91 provided on the reference knob shaft 19, and the spring member 93 urges the same in the same direction as the reference wheel 21.

As described above, if the reference wheel 29 can also be moved in the axial direction, the rotation of the hour hand wheel 23 causes the reference projection 81 to rotate.
When the guide wheel 21 moves in the axial direction by fitting and disengaging from the cam hole 71, the fitting and disengaging of the guide projection 81 can be performed more smoothly.

[0026]

According to the present invention, a guide projection is provided on an hour hand wheel and a reference wheel and a cam hole in which the guide projection is fitted, and the guide contact is closed by fitting the guide projection into the cam hole. When the guide wheel is rotated in the reverse direction of the hour wheel, the guide protrusion is removed from the cam hole by the inclined portion formed in the guide protrusion and the cam hole, and the guide wheel is rotated in the forward direction of the hour wheel. When doing so, the guide wheel is removed from the cam hole by applying an axial force to the guide wheel with a helical tooth provided around the guide wheel, and the guide wheel and, consequently, the guide hand are moved in either forward or reverse direction. It is a guide mechanism that can also set the alarm time by rotating it, and it is only a helical tooth that meshes with the guide wheel and the reference wheel, so it should be a guide mechanism that is easy to manufacture and assemble. Can be done.

Also, if the guide wheel is also urged by a spring material to be movable in the axial direction, the fitting of the guide projection into and out of the cam hole can be facilitated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an outline of a guide mechanism according to the present invention.

FIG. 2 is a view showing a state in which a guide projection of a guide mechanism according to the present invention is inserted into a cam hole.

FIG. 3 is a view showing a state in which a guide projection of the guide mechanism according to the present invention is detached from a cam hole;

FIG. 4 is a side view showing an engagement state between a reference wheel and a reference wheel of the guide mechanism according to the present invention.

FIG. 5 is a sectional view of a main part showing another embodiment of the guide mechanism according to the present invention.

FIG. 6 is a vertical sectional view showing an example of a conventional guide mechanism.

FIG. 7 is a view showing a state in which a cam claw in a conventional guide mechanism is fitted into a cam groove.

FIG. 8 is a view showing a state in which a cam claw in a conventional guide mechanism is disengaged from a cam groove.

FIG. 9 is a diagram showing a state immediately before a cam pawl in a conventional guide mechanism is fitted into a cam groove.

[Explanation of symbols]

 11 Guide axis 13 Hour hand axis 15 Minute hand axis 17 Second hand axis 19 Guide knob axis 21 Guide wheel 23 Hour hand wheel 25 Minute hand wheel 27 Second hand wheel 29 Guide wheel 31 Guide set plate 33 Through hole 35 Positioning pin 37 Convex portion 41 Cam pawl 43 Vertical Wall portion 45 Inclined portion 47 Concave portion 51 Cam groove 53 Front inclined portion 55 Rear inclined portion 59 Playing hole 61 Movable contact 63 Elastic body 65 Fixed contact 71 Cam hole 73 Vertical wall 75 Inclined portion 77 Flat portion 81 Guide projection 83 Vertical wall 85 Inclined part 87 Flat part 91 Locking ring 93 Spring material 95 Spline

Claims (2)

(57) [Claims] An indicator wheel and an hour wheel are arranged coaxially, and the indicator wheel is pressed in the direction of the hour wheel by an elastic body, and a projection provided on the indicator wheel or the hour wheel is attached to the hour wheel or the indicator wheel. In the guide mechanism, when the projection is inserted into the cam hole and the reference wheel is moved to the hour hand wheel side to close the reference contact, the hour wheel forward rotation direction of the projection portion and the hour wheel rotation of the cam hole are located. An inclined portion is provided in at least one of the rolling directions, a helical tooth is formed on the outer periphery of the reference wheel, and a helical tooth meshing with the helical tooth of the reference wheel is formed on the outer periphery of the reference wheel. The watch's standard mechanism. 2. The timepiece guide mechanism according to claim 1, wherein the reference wheel is slidable in the axial direction of the reference knob shaft, and is urged by a spring material in the same direction as the reference wheel.