EP0075535B1 - Vorrichtung zum Steuern der Funktionen einer Uhr, die mindestens den Stand einer dieser Funktionen anzeigen kann - Google Patents

Vorrichtung zum Steuern der Funktionen einer Uhr, die mindestens den Stand einer dieser Funktionen anzeigen kann Download PDF

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Publication number
EP0075535B1
EP0075535B1 EP82810380A EP82810380A EP0075535B1 EP 0075535 B1 EP0075535 B1 EP 0075535B1 EP 82810380 A EP82810380 A EP 82810380A EP 82810380 A EP82810380 A EP 82810380A EP 0075535 B1 EP0075535 B1 EP 0075535B1
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EP
European Patent Office
Prior art keywords
wheel
watch
stem
functions
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82810380A
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English (en)
French (fr)
Other versions
EP0075535A1 (de
Inventor
Marcel Thoenig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
Eta SA Fabriques dEbauches
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Publication of EP0075535A1 publication Critical patent/EP0075535A1/de
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Publication of EP0075535B1 publication Critical patent/EP0075535B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times

Definitions

  • the present invention relates to a device for controlling the functions of a watch with analog display allowing the display of the state of at least one of the controlled functions.
  • control device is of the type comprising a rod which can assume relative to the watch frame several axial positions for controlling several functions of the watch and a part pivotally mounted relative to the frame and driven by the rod, as well as a mobile indicator of the states of the controlled function, visible from the outside of the watch, and a pusher having a rest position and an active position.
  • control devices are well known, in particular by patent CH-B-432 386. They most often comprise a sliding pinion mounted on the rod and the positions of which are controlled by the cooperation of a first part generally called a pull tab and of a second part generally called a rocker acting on the sliding pinion.
  • the sliding pinion depending on its position, acts on different organs which make it possible to control different functions of the watch.
  • these functions are the correction of the hours and the change of time zone, as well as the correction of the display of the dates and the days of the week.
  • the watch When the watch has only these functions, the user can check, simply by looking at the watch face, that the function has been properly controlled. This is indicated by the position of the hands or by the position of the date or week disc.
  • the watch with analog display includes another function such as an alarm function for example, the watch does not a priori contain elements allowing the display of the state of this function.
  • the implementation of this function requires the possibility of indicating whether the alarm function is activated or not, and in the case where the alarm function is activated, if a alarm time between 0 and 12 hours has been selected or on the contrary a wake-up time between 12 to 24 hours.
  • this feedback does not pose any problem since it is easy to provide on the display cell an element informing the user of the state of the selected function and in particular of the alarm clock function.
  • a first object of the invention is to provide a device for controlling the functions of a watch and in particular the alarm function which allows the display of the state of at least one of the controlled functions and in particular of this alarm function.
  • a second object of the invention is to provide such a device which is as simple and reliable as possible and which is compatible with a control device with rod and sliding pinion of conventional type.
  • FIG. 1 shows in simplified form the control device according to a preferred embodiment.
  • the control device essentially comprises the control rod 2 slidingly mounted in the wall 4 of the watch case, the pull tab 6 driven by the rod 2, a mechanism consisting essentially of the lever 8 at the end of which the pawl 10 is mounted and a toothed wheel 12 with which the pawl can cooperate.
  • the wheel 12 meshes with the wheel 14 on which is mounted the indicator disc 16 of the states of the alarm function.
  • the wheels 12 and 14 form a return member between the mechanism and the status indicator 16.
  • a pusher 18 can act on the lever 8 to change the position thereof and that of the pawl 10 associated therewith.
  • the pull tab 6 is pivotally mounted around a fixed axis 6a and the pull stud stud 6b is engaged in a groove 2a of the control rod 2.
  • the axial displacements of the rod 2 which can for example take three different positions, are converted into a rotary movement of the pull tab 6 around its pull rod axis 6a, while the rotational movements of the rod 2 have no effect on the position of the pull pull 6.
  • a first end of the lever 8 has an axis 8a which penetrates into a corresponding bore 6c of the pull tab.
  • the second end of the lever 8 is provided with a second axis 8b which penetrates into a corresponding bore 10a of the pawl 10.
  • the lever 8 has on its edge a first bearing 8c on which the end 18a of the pusher and a second bearing can act 8d on which the end 20a of a return spring 20 acts.
  • This return spring in the form of a blade is fixed to the frame of the movement, for example by the screw 20b and the foot 20c.
  • the end 20a of the return spring 20 is arranged in such a way that it acts substantially opposite the zone of action of the pusher 18 on the lever 8.
  • the pawl 10 has, at its end opposite to that which includes the bore 10a, an active end 10b which can cooperate with teeth 12b of the wheel 12.
  • an active end 10b which can cooperate with teeth 12b of the wheel 12.
  • a lug 10c In the middle region of the pawl 10 is a lug 10c.
  • the lug 10c is guided in translation by a slide 24 defined by a holding piece 22. the slide 24, more precisely, is limited by an edge 22a of the holding piece 22 and by a portion 22b of this holding piece forming an elastic blade.
  • the lug 10c is therefore subject to moving in translation along the slide 24.
  • FIG. 4 shows a possible embodiment of the disk 16 indicating the states of the alarm function.
  • On this disc are carried four identical groups of three indications, respectively AM, PM and OFF which correspond to the indication that the alarm function is activated for the hour corresponding to the first part of the day displayed, that the alarm function is activated for the hour corresponding to the second part of the day displayed and finally, that the alarm function is not activated.
  • the various indications carried on the disc 16 pass behind a window 26 formed in the dial of the watch.
  • the pawl 10 can mesh with the wheel 12 which is pivotally mounted about the fixed axis 12a.
  • the wheel 12 has six teeth 12b and meshes with the wheel 14 which has twelve, the wheel 14 being integral in rotation with the disc 16. It is therefore understood now that each action of the pawl 10 on the wheel 12, this- this advances one sixth of a turn.
  • the wheel 14 advances by a twelfth of a revolution and the indicator disc also advances by a twelfth of a revolution. Consequently, with each action of the pawl, the indicator disk progresses by an angle corresponding to the sector associated with each literal mention written on the disk 16 and it is held there by the jumper 17.
  • FIG. 2 illustrates the operation of the control device when the control rod 2 is in the position corresponding to the alarm function.
  • the position of the rod fixes the position of the pull tab 6 and therefore of the pivot axis 6 c .
  • the position of the lever 8 is perfectly defined, on the one hand by the position of the pivot axis 6 c and, on the other hand, by the fact that the lever is applied against the active end 18a of the pusher 18 by the return spring 20. Consequently, the position of the pivot axis 8b is also perfectly defined. It also follows that the position of the lug 10c in the slide 24 is also perfectly defined.
  • FIG 3 illustrates the operation of the control device in the case where the control rod thereof is not in position. awakening.
  • the different parts of the mechanism are shown in solid lines in their initial position. In this initial position, the lever 8 is always pressed against the end 18a of the pusher 18 by means of the return spring 20. Due to the position of the rod 2, the position of the pivot axis 6 c is modified. It is therefore the same for the pivot axis 8b of the pawl 10. The lug 10c being still trapped in the slide 24, it follows that the active end 10b of the pawl 10 is not introduced between the teeth 12b of the wheel 12. When the user pushes the plunger 18, the lever 8 pivots about the axis 6c.
  • the wake-up time is introduced by means of a mobile which is rotated by the rotation of the control rod 2 when the latter is in the alarm position.
  • a detector system increments an auxiliary counter by a number of pulses which corresponds to the rotation of the hands to bring them to the alarm time.
  • the contents of this counter can be loaded into an auxiliary memory.
  • the content of this auxiliary memory is compared with the content of the hour meter and when there is a coincidence between the two contents, the alarm is triggered. It is however necessary to enter information for switching on or off the alarm function and to introduce the information before 12 noon (AM) "or after 12 noon (PM)". Finally, it is necessary to be able to interrupt the operation of the alarm.
  • FIG. 5 shows the control device on the bottom of the box and it allows a better understanding of the way in which the electrical contacts are closed in order to develop the electrical pulses which have just been mentioned, that is to say the way of which the state control assembly is made
  • These signals are produced by the action of movable contacts on conductive pads a, b, c associated respectively with the conductive tracks 30, 32 and 34 of the printed circuit of the watch.
  • the contact with the pad b is directly controlled by the lever 8 under the action of the push button 18.
  • This first contact is made by a part 36 pivotally mounted around the axis 38 secured to the frame of the watch.
  • the part 36 comprises on the one hand, a branch forming an electrical contact 36a and, on the other hand, a branch 36b defining a slide 40.
  • a stud 42 secured to the lever 8 is subject to move in the slide 40.
  • the pads a and c are associated with contact blades 50 and 52 mounted at the end of pivoting parts 54 and 56.
  • the parts 54 and 56 are mounted so that they can freely pivot around the fixed axes 58 and 60.
  • the parts 54 and 56 are provided with feelers respectively referenced 62 and 64.
  • a cam 66 is integral in rotation with the wheel 12. This cam is symmetrical with respect to a straight line intersecting the pivot axis defined by the axis 12a. It has two depressions 66a.
  • Return springs 70 and 72 hold the parts 54 and 56 in such a way that the feelers 62 and 64 remain in contact with the profile of the cam 66. These return springs 70 and 72 form an integral part of a holding piece 74.
  • the holding part 74 is made integral with the frame by means of the screw 76 and the extensions of the pivot axes 58 and 60 of the parts 52 and 54.
  • the feeler 62 or 64 is in a depression 66a of the cam 66, the associated contact blade 50 or 52 is not in contact with the pad corresponding to a or c.
  • the corresponding contact blade comes into contact with the associated stud a or c.
  • FIGS. 5a and 5b illustrate the state of the contacts a and c as well as the information displayed by the disk 16 as a function of the angular position of the cam 66.
  • the mechanism constituted in the particular example described by the lever 8 and the pawl 10, could be replaced by another mechanism fulfilling the same function.
  • This mechanism must have an active part which takes at least two main positions when the push-button is at rest, namely a first position when the pull tab 6 is in the position where the state of the function must be displayed and a or several second positions when the pull tab is in the other position (s).
  • the first main position must be such that, when the push button is pressed, the mechanism changes what is displayed.
  • the second main position or positions must be such that, when the push button is pressed, the mechanism does not change what is displayed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)

Claims (6)

1. Vorrichtung zum Steuern der Funktionen einer analog anzeigenden Uhr, die die Anzeige des Zustands mindestens einer der genannten gesteuerten Funktionen ermöglicht, der Bauart umfassend eine Stellwelle (2), die relativ zum Uhrgestell mehrere Axialpositionen einnehmen kann, ein drehbeweglich am Gestell angeordnetes Bauteil (6) und angetrieben von der genannten Stellwelle, einem beweglichen Zustandsanzeiger (16) der gesteuerten Funktion, vom Außeren der Uhr her sichtbar, und einen Druckknopf (18) mit einer Ruheposition und einer Aktivposition, dadurch gekennzeichnet, daß sie ferner ein Getriebeorgan (12, 14) umfaßt zum Antreiben des genannten Anzeigers (16) für die Zustände der genannten Funktion sowie einen Mechanismus (8, 10), der mit dem genannten drehbeweglich montierten Teil (6) zusammenwirkt, um in unterschiedliche Positionen von dem genannten Teil (6) verlagert zu werden und ein aktives Ende (10b) umfaßt zum Zusammenwirken mit dem genannten Getriebeorgan (12, 14) und daß, wenn der genannte Druckknopf (18) in Aktivposition ist, er mit dem genannten Mechanismus (18) zusammenwirkt, damit das genannte aktive Ende (10b) eine Verlagerung des genannten Getriebeorgans (12, 14) mit sich bringt, wenn die genannte Stellwelle (2) in einer vorgegebenen Position ist und daß das genannte aktive Ende (10b) nicht auf das genannte Getriebeorgan (12, 14) einwirkt, wenn die genannte Stellwelle (2) in der oder den anderen Position(en) ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie ferner eine Steuerbaugruppe (50 bis 76) für den Zustand der gesteuerten Funktion aufweist, umfassend zumindest einen elektrischen Kontakt (50, 52), welche genannte Steuerbaugruppe von dem genannten Getriebeorgan (12, 14) angetrieben ist.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der genannte Mechanismus umfaßt :
ein erstes Element (8), das einen Hebel bildet, dessen eines erstes Ende (8a) auf dem genannten drehbeweglichen Teil (6) gelagert ist;
ein zweites Element (10), das eine Klinke bildet, deren eines erstes Ende (10a) auf einem zweiten Ende (8b) des genannten ersten Elements (8) gelagert ist, wobei das genannte aktive Ende (10b) des Mechanismus aus einem zweiten Ende des genannten zweiten Elementes (10) besteht und
elastische Mittel (20) zum Anlegen eines Abschnitts des genannten ersten Elements (8), gelegen zwischen seinen Enden, gegen das innere Ende (18a) des genannten Druckknopfs (18).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das genannte Getriebeorgan ein erstes Zahnrad (12) umfaßt, das drehbeweglich auf einer mit dem Uhrgestell verbundenen Achse angeordnet ist sowie ein zweites Zahnrad (14), das mit dem ersten Zahnrad (12) kämmt und drehbeweglich auf einer zweiten mit dem Gestell verbundenen Achse angeordnet ist und daß der genannte Zuständeanzeiger eine Scheibe (16) umfaßt, die drehfest mit dem genannten zweiten Zahnrad (14) ist.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der genannte Mechanismus ferner einen Vorsprung (10c) umfaßt, der aus dem genannten zweiten Element (10) zwischen seinem ersten und zweiten Ende herausragt und Mittel, die eine Gleitbahn (24) bilden, verbunden mit dem Uhrgestell für translatorische Führung des genannten Vorsprungs (10c), welche Gleitbahn (24) derart angeordnet ist, daß sie das genannte zweite Ende (10b) des zweiten Elements mit dem ersten Zahnrad (12) zusammenwirken läßt unter der Wirkung des genannten Druckknopfes (18), wenn das erste Ende (8a) des ersten Elements (8) die durch die Position des drehbeweglichen Teils (6) vorgegebene Position einnimmt, wenn die genannte Stellwelle (2) in der genannten vorgegebenen Position ist, und daß das genannte Ende (10b) des zweiten Elements nicht auf das genannte erste Zahnrad (12) bei der anderen oder den anderen Positionen der genannten Stellwelle (2) einwirkt.
6. Vorrichtung nach einem der Ansprüche 4 und 5, dadurch gekennzeichnet, daß die Steuerbaugruppe des Zustands der gesteuerten Funktion einen Nocken (66) umfaßt, drehfest mit dem genannten ersten Zahnrad (12) sowie mindestens einem elektrischen Kontakt (50, 52), dessen Position von dem genannten Nocken (66) gesteuert wird.
EP82810380A 1981-09-23 1982-09-13 Vorrichtung zum Steuern der Funktionen einer Uhr, die mindestens den Stand einer dieser Funktionen anzeigen kann Expired EP0075535B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH612981A CH645772GA3 (de) 1981-09-23 1981-09-23
CH6129/81 1981-09-23

Publications (2)

Publication Number Publication Date
EP0075535A1 EP0075535A1 (de) 1983-03-30
EP0075535B1 true EP0075535B1 (de) 1986-07-09

Family

ID=4304736

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EP82810380A Expired EP0075535B1 (de) 1981-09-23 1982-09-13 Vorrichtung zum Steuern der Funktionen einer Uhr, die mindestens den Stand einer dieser Funktionen anzeigen kann

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Country Link
US (1) US4422775A (de)
EP (1) EP0075535B1 (de)
JP (1) JPS5882182A (de)
CH (1) CH645772GA3 (de)
DE (1) DE3271941D1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2946198B2 (ja) * 1996-10-11 1999-09-06 セイコーインスツルメンツ株式会社 アラーム付き電子時計
US8480466B2 (en) 2001-03-27 2013-07-09 Igt Method and apparatus for previewing a game
US7918738B2 (en) 2001-03-27 2011-04-05 Igt Interactive game playing preferences
US7390257B2 (en) 2001-12-06 2008-06-24 Igt Programmable computer controlled external visual indicator for gaming machine
EP1349020A1 (de) * 2002-03-28 2003-10-01 Manufacture Roger Dubuis S.A. Uhr mit Kalender
DE60210955T2 (de) 2002-08-27 2007-05-24 Frederic Piguet S.A. Uhr, insbesondere Armbanduhr, mit einem Weckmechanismus
CH707467B1 (fr) * 2005-09-13 2014-07-15 Lvmh Swiss Mft Sa Montre avec affichage multifonctionnel.
US20070153636A1 (en) * 2005-12-29 2007-07-05 Wolfgang Burkhardt Timepiece with AM/PM indicating
US7833102B2 (en) 2006-11-09 2010-11-16 Igt Gaming machine with consolidated peripherals
US8177637B2 (en) 2006-11-09 2012-05-15 Igt Button panel control for a gaming machine
US8096884B2 (en) 2006-11-09 2012-01-17 Igt Gaming machine with adjustable button panel
EP2031468B1 (de) * 2007-08-30 2010-05-26 ETA SA Manufacture Horlogère Suisse Uhr, die mit einer Funktionsanzeige ausgestattet ist
JP5389737B2 (ja) * 2010-06-03 2014-01-15 セイコーインスツル株式会社 時計のボタンロック機構、該機構を備えた時計用ムーブメント及び該ムーブメントを備えた時計
JP6015207B2 (ja) * 2012-07-31 2016-10-26 カシオ計算機株式会社 情報表示装置、及び、アナログ電子時計
EP2887159B1 (de) 2013-12-18 2018-10-31 ETA SA Manufacture Horlogère Suisse Optimierte Multifunktionsanzeigevorrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079749A (en) * 1959-09-30 1963-03-05 Boites De Montres S Graber S A Alarm-watch
CH534381A (fr) * 1971-02-08 1972-09-15 Ebauches S A 1 Faubourg De L H Pièce d'horlogerie
GB1392993A (en) * 1971-07-15 1975-05-07 Citizen Watch Co Ltd Alarm timepiece
JPS5096273A (de) * 1973-12-24 1975-07-31
JPS5732475Y2 (de) * 1976-12-17 1982-07-16
CH616296B (de) * 1977-05-06 Ebauches Sa Montre electromecanique.
JPS5597495U (de) * 1978-12-22 1980-07-07
CH632386B5 (fr) * 1979-10-15 1984-04-13 Ebauchesfabrik Eta Ag Montre electronique a moteur pas a pas et a dispositif d'alarme.
EP0027288B1 (de) * 1979-10-15 1985-12-18 Eta A.G. Ebauches-Fabrik Elektronische Uhr mit Schrittmotor und Alarmschaltung

Also Published As

Publication number Publication date
EP0075535A1 (de) 1983-03-30
JPH0242199B2 (de) 1990-09-20
DE3271941D1 (en) 1986-08-14
US4422775A (en) 1983-12-27
JPS5882182A (ja) 1983-05-17
CH645772GA3 (de) 1984-10-31

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