CN112859565B

CN112859565B - Alarm clock trigger device

Info

Publication number: CN112859565B
Application number: CN202011252985.9A
Authority: CN
Inventors: 赖因哈德·戈德
Original assignee: Lange Uhren GmbH
Current assignee: Lange Uhren GmbH
Priority date: 2019-11-12
Filing date: 2020-11-11
Publication date: 2022-02-08
Anticipated expiration: 2040-11-11
Also published as: CH716793A2; CN112859565A; JP6994550B2; JP2021076595A; CH716793B1; DE102019130516B3

Abstract

The invention relates to an alarm triggering device for a timepiece, comprising: a drive wheel drivable by the spring in a manner rotatable about a first axis and fixedly arranged on the first axis; a minute wheel arranged on the first shaft in a force-fitting manner, the switching wheel being rotatably driven by the minute wheel about a second axis parallel to the first axis; a first transmission member connected to the switching wheel in a coaxial and rotationally fixed manner, the hour wheel being rotatably driven by the first transmission member about a first axis at a rotational speed lower than that of the switching wheel; a first projection of the hour setting wheel parallel to the first axis and directed to the hour wheel, which is supported with a free end on a concentric sliding circle of the hour wheel; a notch formed on the concentric sliding circle of the hour wheel, into which the first projection can be lowered; a second cam of the switching setting wheel, which is rotatable about the second axis and is parallel to the second axis and points towards the switching wheel, can bear under the action of a spring against a crescent of the switching wheel, which is parallel to the switching wheel, and which runs on a coaxial partial circle opposite the second cam.

Description

Alarm clock trigger device

Technical Field

The invention relates to an alarm trigger device for a timepiece, having a drive wheel which can be driven by a clockwork in a rotatable manner about a first axis and is arranged fixedly on the first axis, having a partial wheel which is arranged on the first axis in a force-fitting manner, a switching wheel which can be driven by the partial wheel in a rotatable manner about a second axis parallel to the first axis, having a first transmission piece which is connected to the switching wheel in a coaxial and rotationally fixed manner, the hour wheel being drivable in a rotatable manner about the first axis by the first transmission piece at a lower rotational speed than the switching wheel, having a first cam of the hour setting wheel parallel to the first axis or a third axis and pointing towards the hour wheel, which first cam is supported with its free end face on a concentric sliding of the hour wheel, and having a cutout formed on the concentric sliding circle of the hour wheel, into which the first cam can be lowered, having a circle of the switching setting wheel which can be rotated about the second axis, A second cam parallel to the second axis and pointing towards the switching wheel, which second cam can bear under the action of a spring against a crescent of the switching wheel parallel to the switching wheel, which crescent runs on a coaxial partial circle opposite the second cam.

Background

Such an alarm triggering device that scans a wheel faster than the hour wheel has a higher accuracy alarm process than an alarm triggering device that scans only one wheel. They have the disadvantage that they require a large amount of energy in the clockwork mechanism and therefore have to be designed for a greater energy requirement.

Disclosure of Invention

It is therefore an object of the present invention to provide an alarm triggering device of the type mentioned at the outset which has a simple construction, has a high degree of accuracy in the alarm process and enables the energy required to be reduced.

According to the invention, this object is achieved in that the crescent in the end region close to the falling edge extends obliquely at a specific angle of inclination in the direction opposite to the direction of rotation of the switching wheel towards the switching wheel and ends at the falling edge.

By this design, the second cam moves downward in the inclined region of the crescent during rotation of the switching wheel. This process can be adjusted by the angle of inclination and the friction ratio between the cam and the inclined crescent, so that the second cam slides on the inclined plane at the angle of the spring mechanism without losses. The energy required for this comes from the spring loading of the second cam. The energy required is thereby reduced, which means that the size of the timepiece can also be reduced.

The switching wheel can rotate at three or four times the speed of the hour wheel depending on the gear ratio selected. With the help of the crescent, this facilitates a more accurate triggering of the alarm time.

The spring-loading serves as a sole energy store for the switching wheel which runs faster in scanning and serves as a fixing for the switching setting wheel which is critical for precise alarm times and for the forced triggering of the alarm device. This improves accuracy and reduces the force necessary for spring loading, which in turn reduces the energy requirement taken from the clockwork mechanism when generating the force for spring loading.

The crescent may extend obliquely in the end region close to the falling edge at an angle of inclination of between 4 ° and 15 °, in particular between 4 ° and 8 °.

The first cam can be lowered into the cutout before the second cam is lowered onto the falling edge, so that a precise triggering of the alarm triggering device is achieved by the second cam being lowered from the falling edge of the crescent.

In order to lower the first cam into the cutout of the hour wheel, in a simpler embodiment the hour setting wheel is arranged in a freely rotatable and axially translatable manner about the first or third axis.

In order to lower the second cam at the descending edge of the crescent, in a simpler embodiment, the setting wheel can also engage in a second transmission element which can rotate freely about the second axis and is fixedly connected coaxially to the switching setting wheel and can be driven in rotation manually by the adjusting drive, wherein the second transmission element and the switching setting wheel can be jointly displaced axially by the timing wheel shaft and the switching setting wheel is spring-loaded toward the switching wheel.

The pretensioning force acting on the switching setting wheel is generated in a simple manner in that the free end of a leaf spring, which pretensions the switching setting wheel, acts on the switching wheel, which leaf spring is fixedly clamped with its other end.

For this purpose, a pressure plate is coaxially connected to the switching wheel on the switching wheel side parallel to the switching setting wheel at a distance, said pressure plate being acted upon by the free end of a leaf spring biased against the pressure plate, wherein the leaf spring can extend with its free end in the direction of rotation of the switching setting wheel at a radial distance from the second axis.

In this case, if the leaf spring has a spring leaf extending parallel to its free end, the free end of which rests in the rotational direction of the switching setting wheel in a force-fitting manner under prestress at a distance from the second axis, the undesired rotation of the switching setting wheel is prevented by the force-fitting abutment of the spring leaf.

As soon as the crescent leaves the way for the second cam and the downward movement of the changeover-setting wheel and the second cam is initiated due to the tensioned leaf spring, the leaf spring, due to its slack, not only moves downward but also moves a small section to the left due to its reduced curvature and this movement is transmitted to the changeover-setting wheel via a force-fitting connection with the spring leaf, which also rotates a small section. Thereby, the second cam is free to move downwards without sliding at the falling edge of the crescent. The alarm triggering device is triggered by this unhindered downward movement.

Drawings

Embodiments of the invention are illustrated in the drawings and described in more detail below. Wherein:

FIG. 1 shows a perspective view of an alarm triggering device of a timepiece without an alarm hand and an alarm setter;

FIG. 2 shows an enlarged perspective view of the switching wheel with the transmission and the crescent of the alarm triggering device according to FIG. 1;

FIG. 3 shows an enlarged perspective view of the switch wheel, switch setting wheel and leaf spring of the alarm triggering device according to FIG. 1;

FIG. 4 shows an enlarged perspective view of the hour wheel and the first cam of the alarm triggering device according to FIG. 1;

FIG. 5 shows a perspective view of the alarm triggering device according to FIG. 1 with an alarm pointer;

FIG. 6 shows a perspective view of the alarm triggering device according to FIG. 1 with an alarm setter.

Detailed Description

Figure 1 shows an alarm trigger device and part of a clockwork mechanism. The driving wheel 1 belongs to a clockwork mechanism and can be driven in rotation about a first axis 2 at a rate of one revolution per hour by a barrel, not shown. The cannon pinion 4 is arranged in a force-fitting manner on the first axle 3 of the drive wheel 1 and drives an hour wheel 7 that can be rotated about the first axis 2 via a switching wheel 5 that is fixedly connected to a first transmission 6 and can be rotated about a second axis 9. The first transmission element 6 is fixedly arranged on a second shaft 8 which is parallel to the first shaft 3 and is mounted so as to be rotatable about a second axis 9. An hour hand tube 10, which is coaxial with the first axis 2, is fixedly connected to the hour wheel 7, and an hour hand 11 is arranged on the hour hand tube 10. The minute hand 12 is fixedly connected with the first shaft 3 and further with the minute wheel 4.

The switching wheel 5 rotates at a speed 3 or 4 times that of the hour wheel 7 according to the selected transmission ratio. With the aid of this crescent 13, this can be used to trigger the alarm triggering device more precisely.

The hour setting wheel 14 of the alarm triggering device, which is rotatable about the first axis 2, and the changeover setting wheel 15, which is rotatable about the second axis 9, are coupled via a second transmission piece 16 in the same transmission ratio as the changeover wheel 5 and the hour wheel 7. A second cam 17, which is directed toward the switching wheel 5 and slides on a concentric sliding circle of the crescent 13, is fixedly arranged on the second transmission piece 16 and the switching setting wheel 15. The crescent ends at the falling edge 25.

As shown in fig. 6, a desired alarm time can be set by the setting shaft 21 via the setting pinions 22 at the changeover setting wheel 15 and the time setting wheel 14.

When the alarm time is reached, the hour setting wheel 14 and the changeover setting wheel 15 are pressed down by the pretensioned leaf spring 18 towards the hour wheel 7 or the crescent 13. The setting wheel 14 and the switching setting wheel 15 can be axially translated and their positions can only be changed together. The leaf spring 18 is arranged fixedly with one of its ends and with its other free end 19 loads a loading disk 20 arranged parallel to the second transmission part 16. The loading plate 20 is fixedly connected to the second transmission element 16 and carries the second cam 17.

On the hour setting wheel 14, a first cam 23 is arranged, which points towards the hour wheel 7 and slides on the hour wheel 7 along concentric sliding circles. Shortly before the set alarm time is reached, the first cam 23 drops into a cutout 24 formed in the sliding circle region of the hour wheel 7.

At this point, only the second cam 17 of the switching setting wheel 15, which abuts against the crescent 13, maintains the distance between the switching setting wheel 15 and the switching wheel 5.

Fig. 2 shows the shape of the crescent 13 in detail. It is designed in an end region 26 in front of the falling edge 25 as a bevel inclined by approximately 6 °, so that the second cam 17 travels downward on this inclined plane during further rotation of the switching wheel 5. This process can be adjusted by the angle of inclination and the friction ratio between the second cam 17 and the plane, so that the second cam 17 slides on the inclined plane without losses from the point of view of the spring mechanism. The energy used comes from the leaf spring 18.

Fig. 3 shows the triggering process at the switching wheel 5 in detail. An alarm triggering device is shown shortly before triggering. The second cam 17 is still partly located on the crescent 13. The leaf spring 18 is shown above the loading plate 20 with the second cam 17.

The leaf spring 18 has a spring leaf 27 extending parallel to its free end 19, the free end of which rests in the direction of rotation of the switching setting wheel 15 in a force-fitting manner under pretension against the switching setting wheel 15 at a distance from the second axis 9. An undesired twisting of the changeover setting wheel 15 is prevented by means of the spring leaf 27. The spring leaf 27 is in a force-fitting connection with the switching setting wheel 15.

As soon as the crescent-moon 13 gives way to the second cam 17 at the falling edge 25 and starts moving downwards as a result of the tensioned leaf spring 18, the latter, due to the force of the leaf spring 18, moves not only downwards but also to the left by a small amount as a result of its reduced curvature and this movement is transmitted to the changeover-setting wheel 15 via a force-fit connection with the spring leaf 27, the changeover-setting wheel 15 also rotating by a small amount. Thereby, the second cam 17 is free to move downwards without sliding at the falling edge 25 of the crescent 13. The alarm triggering device is triggered by this unhindered downward movement.

The tensioning of the leaf spring 18 immediately after the alarm process is carried out by the hour wheel 7. This function is shown in fig. 4. The first cam 23 of the setting wheel 14, which, when hidden in fig. 4, drops into the cutout 24 before the alarm time is reached, reaches the end region 26 of the inclined surface in front of the cutout 24. Over about 1.5 hours, this causes the hour-setting wheel 14 and the changeover-setting wheel 15 to rise, so that the leaf spring 18 is tensioned. During this time, the switching wheel 5 is rotated further, for example by 180 °, depending on the transmission ratio. The second cam 17 is therefore lifted in time before it reaches the crescent 13 of the switching wheel 5.

As shown in fig. 5, the set alarm time is displayed by means of the time alarm hand 28 and the minute alarm hand 29 which are not arranged in the center. In this case, the alarm hand 29 is obtained by setting the changeover setting wheel 15 which is decisive for the alarm time. This is done by means of

wheels

30, 31 and 32. The hour display is derived from the hour setting wheel 14 via

wheels

33 and 34.

In order to exactly match the alarm times shown and actual, the alarm time can only be set counterclockwise. The minute alarm wheel 29 for the precise display of the alarm time is here arranged in a non-illustrated fixed axis thereof in a non-positive manner. Thereby it is ensured that a specific setting of the changeover setting wheel 15 always corresponds to the same display of alarm time, irrespective of the backlash of the

wheels

30, 31 and 32. Since the leaf spring 18 prevents the switching setting wheel 15 from twisting by means of its spring leaf 27, the accuracy of the alarm time is no longer influenced by the backlash. If the switching setting wheel 15 is not fixed by a leaf spring 18, but only by friction or alarm time hands within the setting device, the relevant backlash will affect the actual alarm time.

One possibility for a setting device for the alarm time is shown in fig. 6. The alarm time is set by intervening in the switching of the setting wheel 15 via the setting pinion 22. The setting pinion 22 is driven by a wheel 33 mounted freely rotatably on the setting shaft 21. The force is transmitted from the setting shaft 21 with its four-sided part 36 in a form-fitting manner to an axially translatable wheel 34, which is slightly pressed towards the wheel 33 by a spring, not shown. The toothed sections of wheel 34 and wheel 33 meshing with each other with spring force serve to rotate wheel 33 and thus also the switching setting wheel 15 in one direction only.

In order to set the time in a counter-clockwise direction, the time-setting wheel 14 and the switch-setting wheel 15 must be moved to their raised positions by means not shown, in order not to inadvertently set the alarm time in error.

List of reference numerals

1 drive wheel

2 first axis

3 first shaft

4 minute wheel

5 conversion wheel

6 first transmission piece

7 hour wheel

8 second shaft

9 second axis

10 hour hand tube

11 hour hand

12 minute hand

13 crescent board

14 hour setting wheel

15 conversion setting wheel

16 second transmission member

17 second bump

18 leaf spring

19 free end portion

20 load disc

21 setting shaft

22 setting pinion

23 first bump

24 cuts

25 falling edge

26 end region

27 spring leaf

28 time alarm pointer

29 minute alarm pointer

30 wheels

31 wheel

32 wheels

33 wheels

34 wheel

36 square members.

Claims

1. An alarm triggering device for a timepiece, having:

a drive wheel (1) which can be driven by a spring mechanism in a rotatable manner about a first axis (2) and is arranged fixedly on a first shaft (3);

a minute wheel (4) arranged in a force-fitting manner on the first shaft (3), by which a switching wheel (5) can be driven in a rotatable manner about a second axis (9) parallel to the first axis (2);

a first transmission member (6) which is connected to the switching wheel (5) in a coaxial and rotationally fixed manner, wherein the hour wheel (7) can be driven by the first transmission member in a manner rotatable about the first axis (2) or a third axis parallel to the first axis and at a lower rotational speed than the switching wheel (5);

a first cam (23) of the hour setting wheel (14), which is parallel to the first axis (2) or the third axis and is directed towards the hour wheel (7), which abuts with its free end side against a concentric sliding circle of the hour wheel (7); and

a cutout (24) configured on the concentric sliding circle of the hour wheel (7), into which cutout the first cam (23) can be lowered;

a second cam (17) of a switching setting wheel (15) which can rotate about the second axis (9) and which is parallel to the second axis (9) and points towards the switching wheel (5) and which can bear under spring loading against a crescent (13) of the switching wheel (5) parallel to the switching wheel (5) and which extends on a coaxial partial circle opposite the second cam (17),

characterized in that in an end region (26) of the crescent, which is close to the falling edge (25), the crescent (13) extends obliquely at a determined angle of inclination towards the switching wheel (5) in a direction opposite to the direction of rotation of the switching wheel (5), and the crescent terminates at the falling edge (25).

2. Alarm triggering device according to claim 1, characterised in that the crescent (13) extends obliquely at an inclination angle of between 4 ° and 15 ° in the end region (26) close to the falling edge (25).

3. Alarm triggering device according to claim 1 or 2, characterised in that the first cam (23) drops into the cutout (24) before the second cam (17) drops at the falling edge (25).

4. Alarm triggering device according to claim 1 or 2, characterized in that the time-setting wheel (14) is arranged freely rotatable about the first axis (2) or the third axis and axially translatable.

5. Alarm triggering device according to claim 1 or 2, characterized in that the time-setting wheel (14) engages into a second transmission element (16) which is freely rotatable about the second axis (9) and is fixedly connected coaxially with the changeover-setting wheel (15) and which can be driven in a manually rotatable manner by an adjustment drive, wherein the second transmission element (16) and the changeover-setting wheel (15) can be translated in an axial movement jointly with the time-setting wheel (14) and the changeover-setting wheel (15) is spring-loaded towards the changeover wheel (5).

6. Alarm triggering device according to claim 1 or 2, characterized in that the changeover-setting wheel (15) is loaded towards the changeover wheel (5) by the free end (19) of a pretensioned leaf spring (18) which is fixedly clamped with its other end.

7. Alarm triggering device according to claim 6, characterised in that a loading disc (20) is connected coaxially with the changeover setting wheel (15) on the changeover wheel side, spaced apart in parallel from the changeover setting wheel (15), which loading disc is loaded by the free end (19) of the leaf spring (18) which is pretensioned against the loading disc (20).

8. Alarm triggering device according to claim 7, characterized in that the leaf spring (18) extends with its free end (19) radially spaced from the second axis (9) in the direction of rotation of the changeover setting wheel (15).

9. Alarm triggering device according to claim 8, characterized in that the leaf spring (18) has a spring leaf (27) which extends parallel to its free end (19) and whose free end bears in a force-fitting manner against the changeover setting wheel (15) under pretensioning in the direction of rotation of the changeover setting wheel (15) at a distance from the second axis (9).