EP4435533A1 - Uhrmechanismus mit einem nocken und einem taster - Google Patents

Uhrmechanismus mit einem nocken und einem taster Download PDF

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Publication number
EP4435533A1
EP4435533A1 EP23162904.9A EP23162904A EP4435533A1 EP 4435533 A1 EP4435533 A1 EP 4435533A1 EP 23162904 A EP23162904 A EP 23162904A EP 4435533 A1 EP4435533 A1 EP 4435533A1
Authority
EP
European Patent Office
Prior art keywords
cam
feeler
notch
information
reading
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.)
Pending
Application number
EP23162904.9A
Other languages
English (en)
French (fr)
Inventor
Mathieu MARANGÉ
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.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP23162904.9A priority Critical patent/EP4435533A1/de
Publication of EP4435533A1 publication Critical patent/EP4435533A1/de
Pending legal-status Critical Current

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Classifications

    • 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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/02—Back-gearing arrangements between gear train and hands
    • 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
    • G04B21/00—Indicating the time by acoustic means
    • G04B21/02—Regular striking mechanisms giving the full hour, half hour or quarter hour
    • 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

Definitions

  • the present invention relates to a watch mechanism comprising a cam for measuring and/or storing information and a feeler for reading the information on the cam.
  • Cams are commonly used in watchmaking, for example to measure and/or store information, for example time information, which will be read by a feeler resting against the profile of the cam.
  • the feeler is secured to the end of a lever, the other end of the lever being configured to actuate for example a display device or a chime according to the information read on the cam.
  • Such cam mechanisms are used for example in date mechanisms, in repeaters or passing chimes, in chronographs, etc.
  • the information transmitted by the cam generally resides in the value of the radius of the cam, for example in the height of a step located opposite the feeler. If the cam comprises several steps, each step may correspond for example to a discrete value of information, for example a number of fractions of a second measured by a chronograph mechanism, a number of hours, quarter hours and/or minutes to be struck, a day of the week to be displayed, etc.
  • the feeler is then preferably placed in contact with the profile of the cam at the request of a user or at times determined by the watch mechanism.
  • the passage of the feeler across a transition zone between two steps is a critical moment because it corresponds to a transition phase between two states of the watch mechanism which can induce errors in reading the information on the cam if the cam is not positioned precisely. For example, when the cam advances several steps per step and each angular step is small, the risk of an erroneous reading is significant when a end of a step is opposite the probe, especially if the positioning errors are potentially larger than half a step. It is then possible that the information corresponding to the wrong step is read.
  • Cam positioning errors are due, for example, to manufacturing tolerances of the various moving parts of the kinematic chain driving the cam and/or to play between these moving parts.
  • One aim of the invention is to propose a clock mechanism making it possible to compensate for positioning errors of a cam due to the play and manufacturing tolerances of the kinematic chain driving the cam.
  • An additional aim of the invention is to propose a clockwork mechanism making it possible to correct the positioning, in an untensioned gear train driven by such a cam, of a second cam for measuring and/or storing a second piece of information or of a wheel set for displaying a second piece of information.
  • a clockwork mechanism comprising a cam for measuring and/or storing information, mounted in rotation about an axis of rotation and comprising either a plurality of notches or a plurality of protuberances on its periphery and a feeler for reading the information on the cam, the feeler comprising respectively either a protuberance or a notch, the reading of the information on the cam by the feeler being done by moving the feeler towards the cam and either inserting the protuberance of the feeler into a notch of the plurality of notches or inserting a protuberance of the plurality of protuberances into the notch of the feeler, the feeler and the cam being configured such that during the movement of the feeler and insertion of the protuberance into the notch, the feeler adjusts the angular position of the cam to a position for reading the information in which the insertion of the protuberance into the notch is stopped by the profile of the notch and the cam is blocked in rotation by the probe, at
  • the adjustment of the angular position of the cam by the feeler makes it possible to minimize the volume occupied and the energy consumed by the clockwork mechanism of the invention, while providing optimum precision in reading the information. Furthermore, since the angular position of the cam is adjusted when reading the information, it is not necessary for its angular position to be extremely precise outside of these moments, for example during a reset or other adjustment.
  • the feeler and the cam are configured such that the feeler adjusts the angular position of the cam by pressing the protrusion against a surface of the profile of the notch.
  • the feeler and the cam are thus configured such that the pressing force of the feeler against the cam tends to drive the cam in rotation.
  • the protuberance is, for example, in punctual support against two opposite surfaces of the notch profile. This also makes it possible to reduce positioning errors that would be due to manufacturing tolerances of the cam and/or the feeler by averaging the errors on the two support points.
  • each of the plurality of notches is “V” shaped or the notch of the feeler is “V” shaped.
  • This embodiment has the additional advantage that the straight faces then forming the notches are easier to manufacture accurately than for example the circular steps of a snail which must be correctly centered on the axis of rotation and whose radius must be perfectly constant.
  • each protrusion of the plurality of protrusions is then “U”-shaped.
  • the combination of the "V" notch and the "U” protrusion ensures punctate support at a maximum of two locations between the notch and the protrusion.
  • the cam is driven in step-by-step rotation so that at each step either a notch different from the previous one or a protuberance different from the previous one is located opposite the feeler.
  • the rotation of the cam causes the rotation of a non-tensioned gear train comprising a second cam for measuring and/or storing a second piece of information, or a wheel set for displaying a second piece of information.
  • the adjustment of the angular position of the cam thus causes an adjustment of the angular position of the second cam, subject however to errors which may arise from the play and/or tolerances of manufacturing of the moving parts of the kinematic chain between the cam and the second cam. Adjusting the angular position of the cam thus allows reliable reading on the second cam or precise display, for example by correct alignment in a window, of the second information.
  • the watch mechanism is thus for example a chronograph mechanism, the cam being a cam for measuring fractions of a second and the second cam being a cam for measuring seconds or other fractions of a second.
  • the cam is for example a snail whose steps are formed either by the notches of the plurality of notches, or by the protuberances of the plurality of protuberances.
  • a timepiece comprising a watch movement and such a watch mechanism, the watch movement being configured to drive the watch mechanism at least intermittently.
  • the step of holding the cam and the probe in the reading position is preferably short, before the probe returns to its rest position, away from the cam, to allow the cam to rotate again.
  • the duration of this holding step is however long enough to allow the information to be read and transmitted to the corresponding display or sound device, and to allow, if necessary, the reading and/or display of the second information.
  • the clock mechanism of the invention is a chronograph mechanism partially illustrated in figure 1 .
  • the chronograph mechanism is intended to be integrated into a timepiece, for example in a wristwatch, and preferably comprises its own movement 6, stretched between a barrel 60 and an escapement 61. Within the scope of the invention, however, it is also conceivable that the chronograph mechanism is driven by the basic movement of the timepiece.
  • the 7 minute gear of the chronograph is directly driven by barrel 60, as illustrated in figure 1 .
  • This construction makes it possible to simplify the chronograph mechanism, in particular by eliminating the gear train between the seconds wheel and the minutes wheel. This also makes it possible to reduce the size of the chronograph mechanism.
  • the chronograph mechanism further comprises a cam 1 for measuring and storing information, for example fractions of a second, for example tenths of a second, and a second cam 9 for measuring and storing a second information, for example seconds or other fractions of a second.
  • cams 1, 9 are driven by a kinematic chain connected to the movement and part of the mobiles 3, 4, 5 of which are shown in the figures. Unlike the gear train of the movement, which is located between the drive member and the escapement, this kinematic chain is not tensioned. To avoid energy losses, it is also not braked. According to the embodiment shown, the wheel 4 carrying the cam 1 drives the second cam 9.
  • the second cam 9 is for example a snail comprising ten steps 91 at different heights from the axis of rotation 90 of the snail 9, each step 91 preferably corresponding to a discrete value for the second information, for example to a value from zero to nine for the digit of the unit of seconds.
  • the cam 1 comprises notches 11 on its periphery allowing the insertion up to a reading position of a feeler 2 for reading the information.
  • the cam 1 preferably comprises ten notches 11, each notch 11 allowing the insertion and positioning of the feeler 2 at a different distance, or height, relative to the axis of rotation 10 of the cam 1, each notch 11 thus preferably corresponding to a discrete value for the information, for example to a value from zero to nine for the digit of the tenths of a second.
  • the positioning height of the feeler 2 in the notches 11 is for example increasing in the manner of the steps of a traditional snail.
  • the cam 1 is then comparable to a snail whose steps are constituted by the notches 11 instead of being constituted by the usual segments with a circular profile centered on the axis of rotation of the snail.
  • the second cam 9 rotates one revolution while the cam 1 performs, for example, ten revolutions.
  • the second cam 9 then performs one hundred steps of 3.6° each per complete revolution while the cam 1 performs ten steps of 36° each per complete revolution.
  • the cam 1 is adjusted on its rotation axis 10 so that at each step a different notch 11 is positioned, preferably centered, opposite the feeler 2.
  • the second cam 9 advances ten steps per step 91. It is positioned on its rotation axis 90 so that a new step 91 is located opposite the feeler of the second information, not shown, at each revolution of the cam 1 when the notch 11 corresponding, for example, to the number zero is located opposite the feeler 2 of the information.
  • the cam 1 and the second cam 9 are immobilized and the information measured by each cam 1, 9 during the timing is then read on the corresponding profile by the respective feeler and displayed, for example by a specific display on a dedicated part of the dial of the wristwatch.
  • each cam 1, 9 depends essentially on the play present in the kinematic chain upstream of the cam 1, as well as the manufacturing tolerances of the various mobiles.
  • the positioning error at the end of such a kinematic chain is typically of the order of a few degrees, which can lead to errors in reading the information on the cams 1, 9 resulting in an inaccurate display, or even the reading of erroneous information.
  • the angular position of the cam 1 is adjusted each time the information is read by the feeler 2, thus making it possible to correct the positioning errors due to the upstream part of the kinematic chain of the watch mechanism. Adjusting the position of the cam 1 also results in adjusting the angular position of the second cam 9.
  • FIG 4 shows the feeler 2 in the rest position. In this position, the feeler 2 is spaced from the cam 1 to allow it to rotate. According to the embodiment shown in the figures, the notch 11 has a “V” shape and the end of the feeler 2 forms a rounded protuberance.
  • FIG 5 illustrates the movement of the feeler 2 and the insertion of the protuberance into a notch 11 of the cam 1 for reading the information at the end of a timing period.
  • the protuberance of the feeler 2 is inserted, for example by the rotation of a lever carrying the feeler 2, into the notch 11 located opposite the feeler 2.
  • the protuberance during its insertion first comes into contact with a single surface 12 of the profile of the notch 11.
  • the notch 11 and the feeler 2 are configured so that the force exerted by the support of the feeler 2 on the cam 1, for example on this surface 12, is exerted in a direction tending to cause the rotation of the cam 1 allowing the continuation of the insertion of the protuberance of the feeler 2 into the notch 11.
  • the kinematic chain upstream of the cam 1 is preferably configured to allow the rotation of the cam 1 and thus the adjustment of its angular position by the feeler 2.
  • the upstream kinematic chain thus preferably has sufficient clearance to allow such an adjustment.
  • the adjustment of the angular position of the cam 1 continues until the protuberance of the feeler 2 comes into contact with a second surface 13 of the profile of the notch 11, opposite the first surface 12.
  • the protuberance then bears against two opposite surfaces 12, 13 of the profile of the notch 11 so that the insertion of the protuberance of the feeler 2 into the notch 11 is stopped and the rotation of the cam 1 is blocked.
  • the feeler 2 is in the information reading position.
  • the insertion height of the feeler 2 into the notch relative to the rotation axis 10 of cam 1 is representative of the value of the information measured and/or stored by cam 1.
  • the second cam 9 being driven by the cam 1, the adjustment of the angular position of the cam 1 by the feeler 2 also causes the adjustment of the position of the second cam 9, subject to the errors due to the play of the gear train 4, 5 between the two cams 1, 9 and the manufacturing tolerances of the corresponding mobiles 4, 5. Given the reduced number of mobiles between the two cams 1, 9, these errors are smaller than those due to the entire kinematic chain from the movement. Standard manufacturing techniques generally make it possible to maintain the positioning error of the second cam 9 below half of its angular pitch.
  • the readjustment of the angular position of the second cam 9 following the readjustment of the angular position of the cam 1 thus makes it possible to avoid errors in reading the second information on the second cam 9.
  • the correction of the angular position of the second cam 9 according to the invention is particularly beneficial when one end of a step 91 is located opposite the sensor of the second information in order to avoid reading this information on the following or preceding step.
  • the notches 11 are “V” shaped and the protuberance of the probe 2 is rounded, “U” shaped, which allows a punctate contact of the probe 2 on each of the opposite surfaces 12, 13 and makes the reading positions particularly precise.
  • Other shapes of notches and/or protuberance are however conceivable within the scope of the invention.
  • the notches can for example be “U” shaped and the probe also rounded; the notches can be “V” shaped and the probe pointed, etc.
  • the feeler has a notch on its end to cooperate with a protuberance of the cam, for example a “V” shaped tip or a protuberance with a rounded top in "U”, which fits into the notch of the feeler when the information is read on the cam.
  • a protuberance of the cam for example a “V” shaped tip or a protuberance with a rounded top in "U”
  • the principle of cooperation of the contact surfaces for the adjustment of the angular position of the cam by pressing the feeler against the cam during the reading of the information is similar to what is described above in the case where the notch is on the cam and the protuberance on the feeler.
  • the clock mechanism according to the invention also makes it possible, thanks to the adjustment of the angular position of the cam 1 at each reading of the information, to simplify a possible zero-reset mechanism, as exists for example in chronograph mechanisms.
  • a mechanism is for example shown in the figure 1 , showing a core 8 secured to the second cam 9.
  • Such a core 8 makes it possible in a known manner, by an appropriate mechanism not shown, to reset the second cam 9, that is to say to return the second cam 9 for example to the angular position corresponding to the number zero or any other starting position.
  • the cores are mechanical elements requiring great manufacturing precision on which the precision of the reset of the corresponding mobile will depend.
  • the watch mechanism is a chronograph mechanism. It comprises a cam for measuring and/or storing information, driving a second cam for measuring and/or storing a second information, for example tenths of a second and seconds.
  • the clockwork mechanism of the invention comprises a cam for measuring and/or storing information, driving a mobile for displaying a second piece of information, for example calendar information.
  • the mechanism of the invention is then, for example, a calendar with jumping and/or on-demand display.
  • the position of the cam is adjusted in order to ensure the alignment of the display, for example in a window.
  • the clockwork mechanism of the invention is a striking mechanism in which, for example, the adjustment of the angular position of a cam when reading information to be struck, for example the quarter hours or the minutes, leads to the adjustment of the angular position of a second cam allowing the reading, for example, of the hours to be struck.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
EP23162904.9A 2023-03-20 2023-03-20 Uhrmechanismus mit einem nocken und einem taster Pending EP4435533A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23162904.9A EP4435533A1 (de) 2023-03-20 2023-03-20 Uhrmechanismus mit einem nocken und einem taster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23162904.9A EP4435533A1 (de) 2023-03-20 2023-03-20 Uhrmechanismus mit einem nocken und einem taster

Publications (1)

Publication Number Publication Date
EP4435533A1 true EP4435533A1 (de) 2024-09-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23162904.9A Pending EP4435533A1 (de) 2023-03-20 2023-03-20 Uhrmechanismus mit einem nocken und einem taster

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EP (1) EP4435533A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH699455A1 (fr) * 2008-09-05 2010-03-15 Montres Paul Picot S A Soc D Mécanisme d'affichage d'une information périodique.
CH713209A2 (fr) * 2016-12-08 2018-06-15 Richemont Int Sa Mécanisme d'affichage pour pièce d'horlogerie.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH699455A1 (fr) * 2008-09-05 2010-03-15 Montres Paul Picot S A Soc D Mécanisme d'affichage d'une information périodique.
CH713209A2 (fr) * 2016-12-08 2018-06-15 Richemont Int Sa Mécanisme d'affichage pour pièce d'horlogerie.

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