EP3486735B1 - Uhrwerksmechanismus zur nullrückstellung der sekunde mit schneckennocken - Google Patents

Uhrwerksmechanismus zur nullrückstellung der sekunde mit schneckennocken Download PDF

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Publication number
EP3486735B1
EP3486735B1 EP17202604.9A EP17202604A EP3486735B1 EP 3486735 B1 EP3486735 B1 EP 3486735B1 EP 17202604 A EP17202604 A EP 17202604A EP 3486735 B1 EP3486735 B1 EP 3486735B1
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EP
European Patent Office
Prior art keywords
hammer
seconds
cam
hand
rotation
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.)
Active
Application number
EP17202604.9A
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English (en)
French (fr)
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EP3486735A1 (de
Inventor
Jérôme Mace
Sebastián ALAGON CARILLO
Alain Zaugg
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.)
Montres Breguet SA
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Montres Breguet SA
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Filing date
Publication date
Application filed by Montres Breguet SA filed Critical Montres Breguet SA
Priority to EP17202604.9A priority Critical patent/EP3486735B1/de
Priority to US16/178,034 priority patent/US11163266B2/en
Priority to JP2018211116A priority patent/JP6609020B2/ja
Priority to CN201811375293.6A priority patent/CN109814365B/zh
Publication of EP3486735A1 publication Critical patent/EP3486735A1/de
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Publication of EP3486735B1 publication Critical patent/EP3486735B1/de
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B27/00—Mechanical devices for setting the time indicating means
    • G04B27/001—Internal gear therefor, e.g. for setting the second hand or for setting several clockworks
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms
    • G04F7/0809—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms with single hammers, i.e. one hammer acts on each counter

Definitions

  • the invention relates to the field of watchmaking. It relates, more precisely, to a horological mechanism for resetting the seconds to zero as well as a watch equipped with such a mechanism.
  • the cam usually has a heart shape, which is why it is referred to simply as “heart” as it appears in the reference manual for IT. Reymondin et al, “Theory of watchmaking”, Federation of Technical Schools, 2015 edition, p.238 .
  • the hammer is a complex part provided with several cam followers which strike several simultaneously. Respective cams, integral with the hour hand, the minute hand, the seconds hand (and, more occasionally, a tenth hand).
  • the cam follower is usually formed by one end of the hammer in the shape of a horse shoe, which comes, at the end of its stroke (angular or linear), to rest against a double boss formed on the heart to maintain it in a stable position corresponding to the reset of the second hand.
  • the position of the second hand when resetting is usually quite random and lacks precision. This is particularly detrimental in the case of a jumping needle, which is supposed to be at every second in a very precise angular position (each angular position being spaced from the next by 6 °).
  • the momentum acquired by the heart during its rotation means that it is not immediately blocked at the end of its stroke by the support of the end of the hammer in the seconds shaft, but remains, before s 'immobilize, animated by damped oscillations which adversely affect the perception of precision expected by an informed user.
  • a first objective is to provide a second reset mechanism which provides a precise position of the second hand, exactly opposite a predetermined graduation of the dial (typically a twelve hour index).
  • a third objective is to provide a mechanism for resetting the second of simpler architecture (and therefore less bulky, lighter and easier to manufacture) than the known mechanisms.
  • the mechanism remains efficient while being quite simple, light and compact.
  • the seconds hand can find a precise position next to a graduation.
  • the watch can be equipped with a dial provided with a graduation including a twelve hour index with which the hand is substantially aligned when it is in the angular end-of-travel position.
  • This watch 1 comprises a middle part 2, which can be made of metal (eg steel), or a synthetic material (eg a composite material comprising a polymer matrix loaded with fibers, typically of carbon).
  • metal eg steel
  • synthetic material eg a composite material comprising a polymer matrix loaded with fibers, typically of carbon
  • Watch 1 may include, for wearing on the wrist, a bracelet 3 (in phantom on the FIG. 1 ) which is fixed on the middle part 2 between horns 4 formed projecting thereon.
  • the caseband 2 has a circular outline, but this shape is not limiting. In particular, this contour could be rectangular (eg square).
  • the middle part 2 defines an interior space 5.
  • the watch 1 comprises, to close this interior space 5, a crystal and a back (not shown), fixed on either side of the middle part 2.
  • Watch 1 is equipped with a dial 6 provided with a graduation 7.
  • the graduation 7 includes indexes 8 for each hour and intermediate indexes 9 for each minute.
  • the intermediate minute markers 9 are preferably smaller than the hour markers 8.
  • the hour markers 8 are not figurative. However, alternatively, the hour markers 8 could be figurative, and be in the form of numerals (eg Roman, Arabic, Gothic, Greek). Be that as it may, the graduation includes an index 10 of the twelve hours, indicating midnight and noon for the hours, and indicating the zero of the minutes and seconds.
  • Watch 1 comprises a timepiece movement (hereinafter simply referred to as "movement"), which comprises a plate intended to be housed in the middle part 2 by being fixed to the latter, for example. by means of screws.
  • the mainplate forms a support for various mechanisms such as gear train, escapement, transmission, timer, winder (non-exhaustive list).
  • the movement comprises a timer mobile 11, which includes an hour wheel and a minute wheel (not shown) as well as a seconds wheel 12.
  • the timer mobile 11 is mounted to rotate about an axis A1.
  • the timer mobile 11 is driven in rotation by a motor device (not shown). It is preferable that the power source is a barrel spring associated with a spiral balance regulator. However, it would not be outside the scope of the present invention for the energy source to be a battery associated with a quartz regulator.
  • Watch 1 comprises an hour hand and a minute hand (not shown), respectively for displaying the hours and minutes.
  • watch 1 further comprises a seconds hand 15 (also called a “second hand” or more simply “second hand”), coupled to the seconds wheel 12.
  • seconds hand 15 also called a “second hand” or more simply “second hand”
  • the seconds hand 12 is driven in rotation, by the timing wheel set 11, around an axis A2 around which it makes a complete revolution in one minute.
  • the seconds hand 15 is a large central second hand, its axis A2 of rotation coinciding with the central axis of dial 6.
  • the seconds hand 15 has a distal end 16 which runs, during the rotation of the hand 15, the dial 6 passing successively to the right of each index 8, 9 of the graduation 7.
  • the seconds hand 15 is mounted (by being driven for example) on a seconds shaft 17 which extends along the axis A2.
  • the seconds shaft 17 comprises an upper section 18, on which the seconds hand 15 is mounted, and a lower section 19.
  • a pinion 20 which meshes with the seconds wheel 12. Specifically, as illustrated on FIG. 3 , the pinion 20 is mounted on the lower section 19 of the second shaft 17.
  • the lower section 19 of the shaft 17 of the seconds is provided with one or more bead (s) 21 of larger diameter, on which (which) the pinion 20 is fitted. This results in a reduction in the interface between the seconds shaft 17 and the pinion 20.
  • the seconds shaft 17 and the pinion 20 are integral in rotation as long as the seconds shaft 17 is not subjected to any driving torque (or resistance) applied independently of the pinion 20.
  • Watch 1 is equipped with a clock mechanism 22 for resetting the second to zero.
  • the second hand 15 is separated from the timer mobile 11 and reset to the right of the index 10 of the twelve hours (that is to say to zero) when a time reset is initiated by the wearer, in particular by pulling on the crown 14.
  • the second reset mechanism 22 comprises a cam 23 rotatably secured to the seconds shaft 17 and a peripheral edge of which forms a path 24. cam.
  • the cam 23 is an attached part mounted tight (typically by driving) on the shaft 17 of the seconds.
  • the cam 23 is fitted on the upper section 18 of the second shaft 17. Its height position is fixed by a collar 25 formed on the shaft 17 of the seconds at the junction between the upper section 18 and the lower section 19, and against which the cam 23 is wedged.
  • the cam 23 is in the form of a spiral: the cam path 24 extends in a spiral around the axis A2 (that is to say around the shaft 17 of the seconds) from one end 26 internal (close to axis A2), to an external end 27 (remote from axis A2).
  • the cam path 24 is smooth, without roughness.
  • the inner end 26 and the outer end 27 are interconnected by a stop surface 28 which extends substantially radially with respect to the seconds shaft.
  • a stop surface 28 which extends substantially radially with respect to the seconds shaft.
  • Cam 23 is advantageously a metal part, e.g. in steel. It is preferably perforated, in order to be light and to have a low moment of inertia.
  • the cam follower 30 is eg. in the form of a lug which projects at a free end 31 of the hammer, at a distance from the axis A3 of the hammer.
  • the cam follower 30 is advantageously made of a material with a low coefficient of friction, e.g. in a plastic material (in particular polytetrafluoroethylene, also known under the names PTFE and Teflon®), or in a precious stone (in particular in ruby).
  • the cam follower 30 is advantageously rigidly fixed (from non-removable manner) on the hammer 29.
  • the hammer 29 and the cam follower 30 can form a single piece element, formed from a single machined part.
  • the end-of-travel angular position of the seconds hand 15 (zero position) is determined by the abutment of the cam follower 30 against the abutment surface 28. In this position, shown on FIG. 7 (and more particularly in the detail medallion at the bottom middle), the rotation of the cam 23 (and therefore of the seconds shaft 17 and of the seconds hand 15) is stopped.
  • the support of the cam follower 30 on the cam path 24 is provided by a lever effect exerted on the hammer 29, which tends to cause it to pivot (here in the clockwise direction) around the axis A3 of the hammer.
  • the mechanism 22 comprises a hammer spring 32.
  • This hammer spring 32 is provided with a fixed head 33 and an elastic blade 34 which urges the hammer 29 towards its engaged position.
  • the hammer 29 carries a protruding primary pin 35, against which the leaf 34 of the spring bears permanently.
  • the leverage exerted on the hammer 29 by the elastic blade 34 of the hammer spring 32 via the primary pin 35 is illustrated by the black arrow at the top on the FIG. 5 .
  • the induced rotation of hammer 29 is indicated by the black arrow in the middle of the FIG. 5 .
  • This rotation brings the cam follower 30 into contact with the cam track 24. Since the cam track 24 is smooth, and the cam follower 30 has a low coefficient of friction, the latter can freely slide on the cam track 24.
  • the cam 23, the hammer 29 and the hammer spring 32 are configured so that, whatever the angular position of the cam 23, the torque induced thereon by the cam follower 30 is always greater than the threshold beyond of which a slip occurs at the interface between the second shaft 17 and the pinion 20.
  • the actuator 36 is in the form of a rod mounted in translation (but it could be mounted in rotation).
  • the hammer 29 for its part carries a projecting secondary pin 37, against which a shoulder 38 formed on the actuator 36 bears in position. retention of it.
  • This shoulder 38 is eg. defined by a claw 39 protruding from one end of the actuator 36.
  • the movement of the actuator 36 is controlled by the winder, and more precisely by the crown 14.
  • the crown 14 places the actuator 36 in the retaining position, which maintains the hammer 29 in the disengaged position and allows rotation of the seconds shaft 17 (and with it of the seconds hand 15) induced by the timer mobile 11.
  • the latter places the actuator 36 in the release position (horizontal black arrow, top left on the FIG. 5 ), which allows the hammer spring 32 to exert its leverage on the hammer 29 to apply the cam follower 30 to the cam track 24.
  • the second reset mechanism 22 comprises a non-return pawl system 40 which only allows the rotation of the cam 23 in one direction (the direction time in the example shown).
  • the ratchet system 40 comprises a toothed wheel 41 mounted coaxially with the seconds shaft 17, and a pawl 42 carried by the cam 23 and which engages the toothed wheel 41.
  • the toothed wheel 41 is integral in rotation with the pinion 20, if necessary (as illustrated in FIG. 2 ) via a doll 43 driven on the pinion 20.
  • the doll 43 is integrated into a transmission wheel 44 meshing eg. a ringing mobile (not shown).
  • the toothed wheel 41 has Breguet type teeth, that is to say that the teeth are triangular and asymmetrical.
  • the toothed wheel 41 comprises sixty teeth, which each index, via the pawl 42, a determined position of the seconds hand 15 (which is then called "jumping") corresponding to each of the sixty seconds contained in a minute.
  • the positions of the second hand are separated from each other by an angle of 6 °.
  • the pawl 42 is biased towards the toothed wheel 41 by means of a spring blade 45 also carried by the cam 23.
  • the operation of the second reset mechanism 22 is as follows.
  • the seconds shaft 17 (and with it the seconds hand 15) is integral in rotation with the pinion 20, which, meshed by the timing wheel set 11, drives it in rotation around the axis A2. Under these conditions, the seconds hand 15 plays its role as a second hand and provides the wearer with an indication of the seconds elapsed in the current minute.
  • the 15 seconds hand is then in its end position. of travel, and is located approximately to the right of the index 10 of the twelve hours on the graduation 7 of the dial 6.
  • the pawl 42 is positioned between two successive teeth of the toothed wheel 41, and thus blocks any rebound of the hand when it reaches the end of its travel, for the benefit of the precision of the reset.
  • the 15 seconds hand, at the end of its travel, may not be exactly in line with the 10 twelve hour index.
  • axis A3 of hammer is defined by a shaft 46 provided with an eccentric 47.
  • the rotation of the eccentric 47 causes the hammer 29 to debate by adjusting the angular end position of the second hand 15 (as suggested by the various positions sketched in dotted lines on the FIG. 8 ).
  • the rotation of the eccentric 47 is e.g. performed by manual action, typically by means of a screwdriver.
  • one end of the eccentric 47 is shaped as a recess 48 (eg, a slot) for a screwdriver. It is illustrated, in the lower left detail medallion on the FIG. 7 , the rotation of the eccentric (double black arrow), and its effect (dotted lines) on the positioning of the hammer 29.
  • the actuator 37 is returned to its retaining position ( FIG. 8 ).
  • the movement of the actuator 37 exerts a traction on the secondary pin 37 and drives the hammer 29 in rotation against the return force of the spring 32.
  • the rotation of the hammer causes the cam follower 30 to slide along. the abutment surface 28, then release the cam follower 30 from the cam 23. Consequently, no motor or resistive torque is applied on the second shaft 17, including the frictional forces at the interface between the (S) bead (s) 21 and the pinion 20 re-couples it in rotation to the latter.
  • the seconds reset mechanism 22 which has just been described has the following advantages.
  • the present mechanism 22 is of simpler architecture.
  • Hammer 29, in particular, is less complex in shape.
  • the absence of a heel, and the presence of the cam follower 30 which, at the end of the stroke, simply abuts against the abutment surface 28, prevents rebounds of the seconds hand 15, to the benefit of the reliability of the mechanism 22 .
  • this mechanism 22 is light, compact, and easy to manufacture.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Electromechanical Clocks (AREA)

Claims (10)

  1. Uhrwerksmechanismus (22) zur Nullrückstellung der Sekunde, der umfasst:
    - eine Sekundenwelle (17);
    - einen Sekundenzeiger (15), der mit der Sekundenwelle (17) drehfest verbunden ist;
    - eine Kurvenscheibe (23), die mit der Sekundenwelle (17) drehfest verbunden ist und von der ein peripherer Rand einen Kurvenscheibenweg (24) bildet;
    - einen Hammer (29), der mit einem Kurvenscheibenmitläufer (30) versehen ist, wobei dieser Hammer (29) drehbar um eine Hammerachse (A3) zwischen einer ausgekuppelten Position, in der der Kurvenscheibenmitläufer (30) von dem Kurvenscheibenweg (24) beabstandet ist, und einer eingekuppelten Position montiert ist, in der der Kurvenscheibenmitläufer (30) auf den Kurvenscheibenweg (24) drückt, um ein Antriebsmoment auf die Sekundenwelle (17) auszuüben;
    wobei dieser Mechanismus (22) dadurch gekennzeichnet ist, dass:
    - sich die Kurvenscheibe (23) in Form einer Schnecke darstellt, wobei sich der Kurvenscheibenweg (24) spiralförmig um die Sekundenwelle (17) herum ausgehend von einem inneren Ende (26) bis zu einem äußeren Ende (27) erstreckt, die durch eine Anschlagoberfläche (28) miteinander verbunden sind, die sich im Wesentlichen radial in Bezug auf die Sekundenwelle (17) erstreckt und gegen die der Kurvenscheibenmitläufer (30) in einer Endlagen-Winkelposition des Sekundenzeigers (15) anschlägt;
    - er ein Rückschlag-Sperrkegelsystem umfasst, das ein Zahnrad (41), das auf der Sekundenwelle (17) montiert ist, und einen Sperrkegel (42) umfasst, der von der Kurvenscheibe getragen wird und der in das Zahnrad (41) eingreift.
  2. Mechanismus (22) nach Anspruch 1, dadurch gekennzeichnet, dass er eine Hammerfeder (32) umfasst, die mit einem festsitzenden Kopf (33) und einer elastischen Klinge (34) versehen ist, die den Hammer (32) in seine eingekuppelte Position beansprucht.
  3. Mechanismus (22) nach Anspruch 2, dadurch gekennzeichnet, dass der Hammer (29) einen vorstehenden primären Zapfen (35) trägt, gegen den die Klinge (34) der Feder permanent drückt.
  4. Mechanismus (22) nach Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, dass er ein Wirkglied (36) umfasst, das beweglich zwischen einer Haltposition, in der es den Hammer (29) in seiner ausgekuppelten Position platziert, und einer Freigabeposition montiert ist, in der es dem Hammer (29) ermöglicht, seine eingekuppelte Position einzunehmen.
  5. Mechanismus (22) nach Anspruch 4, dadurch gekennzeichnet, dass der Hammer (29) einen vorstehenden sekundären Zapfen (37) trägt, gegen den eine Schulter (38), die auf dem Wirkglied (36) gebildet ist, in der Halteposition von diesem drückt.
  6. Mechanismus (22) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Zahnrad (41) eine Zahnung vom Typ Breguet umfasst.
  7. Mechanismus (22) nach Anspruch 6, dadurch gekennzeichnet, dass das Zahnrad (41) sechzig Zähne umfasst.
  8. Mechanismus (22) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Hammerachse (A3) von einer Welle (46) gebildet wird, die mit einem Exzenter (47) versehen ist, dessen Drehung den Hammer (29) ausschwenken lässt, indem die Endlagen-Winkelposition des Sekundenzeigers (15) angepasst wird.
  9. Uhr (1), die mit einem Uhrwerksmechanismus (22) zur Nullrückstellung der Sekunde nach einem der vorstehenden Ansprüche ausgestattet ist.
  10. Uhr (1) nach Anspruch 9, die mit einem Zifferblatt (6) ausgestattet ist, das eine Teilung (7) aufweist, die einen Zwölf-Uhr-Index (10) umfasst, mit dem der Sekundenzeiger (15) im Wesentlichen fluchtet, wenn er sich in der Endlagen-Winkelposition befindet.
EP17202604.9A 2017-11-20 2017-11-20 Uhrwerksmechanismus zur nullrückstellung der sekunde mit schneckennocken Active EP3486735B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17202604.9A EP3486735B1 (de) 2017-11-20 2017-11-20 Uhrwerksmechanismus zur nullrückstellung der sekunde mit schneckennocken
US16/178,034 US11163266B2 (en) 2017-11-20 2018-11-01 Timepiece mechanism for returning the seconds hand to zero with a snail cam
JP2018211116A JP6609020B2 (ja) 2017-11-20 2018-11-09 渦カムで秒針を帰零させる計時器機構
CN201811375293.6A CN109814365B (zh) 2017-11-20 2018-11-19 利用蜗形凸轮使秒针回零的钟表机构

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17202604.9A EP3486735B1 (de) 2017-11-20 2017-11-20 Uhrwerksmechanismus zur nullrückstellung der sekunde mit schneckennocken

Publications (2)

Publication Number Publication Date
EP3486735A1 EP3486735A1 (de) 2019-05-22
EP3486735B1 true EP3486735B1 (de) 2020-09-30

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EP17202604.9A Active EP3486735B1 (de) 2017-11-20 2017-11-20 Uhrwerksmechanismus zur nullrückstellung der sekunde mit schneckennocken

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US (1) US11163266B2 (de)
EP (1) EP3486735B1 (de)
JP (1) JP6609020B2 (de)
CN (1) CN109814365B (de)

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Publication number Publication date
CN109814365B (zh) 2020-12-01
JP2019095439A (ja) 2019-06-20
US20190155221A1 (en) 2019-05-23
US11163266B2 (en) 2021-11-02
CN109814365A (zh) 2019-05-28
EP3486735A1 (de) 2019-05-22
JP6609020B2 (ja) 2019-11-20

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