EP3765923A1 - Système de réglage d'une friction - Google Patents
Système de réglage d'une frictionInfo
- Publication number
- EP3765923A1 EP3765923A1 EP19713718.5A EP19713718A EP3765923A1 EP 3765923 A1 EP3765923 A1 EP 3765923A1 EP 19713718 A EP19713718 A EP 19713718A EP 3765923 A1 EP3765923 A1 EP 3765923A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- friction
- threaded element
- spring
- frame
- support shaft
- 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
Links
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
-
- 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
- G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2370/00—Apparatus relating to physics, e.g. instruments
Definitions
- the invention relates to a system for adjusting a friction between a first member and a second member.
- the invention also relates to a clock mechanism comprising such a control system.
- the invention also relates to a timepiece comprising such a clock mechanism or such a control system.
- the invention finally relates to an adjustment method using such a control system.
- a timepiece with a chronograph generally includes chronograph mobiles mounted pivoting friction on a timepiece frame.
- an elastic blade of steel or brass, or foil is generally fixed to the frame and in contact with the chronograph mobile so as to slow the rotation of the chronograph mobile.
- the adjustment of the friction of the blade against the mobile is very delicate. Indeed, it is on the one hand difficult to adjust the friction force which is very low (of the order of microNewton) and it is also difficult to regulate this effort because it involves a partial disassembly of the movement which can be achieved by replacing the foil. Such disassembly of different parts is long, tedious and expensive.
- the object of the invention is to provide a friction control system remedying the problems mentioned above and improving the known systems of the prior art.
- the invention proposes an adjustment system making it possible to easily adjust the friction between two watchmaking organs, in particular an easy adjustment of the friction of a chronograph mobile.
- An adjustment system according to the invention is defined by claim 1. Different embodiments of the adjustment system are defined by the dependent claims 2 to 8. A watch mechanism according to the invention is defined by claim 9.
- a timepiece according to the invention is defined by claim 1 1.
- Figure 1 is a schematic sectional view, along a plane passing through an axis of a chronograph mobile, an embodiment of a timepiece.
- Figure 2 is a detailed perspective view of a control system according to one embodiment of the invention.
- FIG. 3 is a perspective view of a clock mechanism according to one embodiment of the invention.
- the timepiece 200 is for example a watch, in particular a wristwatch.
- the timepiece 200 comprises a watch mechanism 100, in particular a mechanical watch movement 100.
- the watch movement is for example of the manual winding type or the self-winding type.
- the movement includes for example a chronograph module or a chronograph mechanism.
- the chronograph module or the chronograph mechanism comprises chronograph mobiles, in particular a mobile 7, 1 1, 12 chronograph seconds and / or a chronograph minute mobile and / or a chronograph hour mobile and / or a mobile of fractions of chronograph seconds.
- the watch mechanism 100 comprises a system 1 for adjusting a friction between a mobile of the chronograph and a frame 9, more generally a system 1 for adjusting a friction between a first member 7, 1 1 , 12 and a second member 8, in particular of an intensity of a friction torque between a first member 7, 11, 12 and a second member 8.
- the first member 7, 11, 12 is a chronograph mobile having an axis of rotation A, in particular the first member 7, 1 1, 12 is a mobile seconds.
- the first member is movable in rotation relative to the frame 9 about the axis A.
- the chronograph mobile comprises a rod 7 at the end of which a seconds indicator (not shown) as a needle is mounted, in particular driven .
- a second wheel 11 and a core cam 12 are fixed, in particular driven on the rod 7.
- the chronograph mobile comprises the rod 7, the wheel 1 1 and the core cam 12.
- the second member 8 is fixed relative to the frame 9.
- the second member 8 may have another function.
- the second member is a bearing 8 providing a pivot connection of the chronograph mobile, specifically the rod 7 of the chronograph mobile, relative to the frame 9.
- the bearing is for example a stone or a ruby.
- the contact for adjusting the friction between the first member and the second member is preferably a planar contact, in particular a planar contact on an annular surface centered on the axis A.
- the contact surface may, however, have any other shape. It can in particular be conical.
- the first member, in particular the rod 7 comprises a shoulder 7 '. This shoulder abuts or abuts against the second member, in particular the bearing 8.
- a first annular surface provided on the shoulder bears on a second annular surface provided on the bearing.
- the adjustment system 1 comprises the frame 9, a threaded element 2 screwed onto the frame 9.
- the threaded element 2 has an axis coincident, or substantially coincident, with the axis A of the chronograph mobile.
- the threaded element 2 is arranged to exert a mechanical action on the rod 7, this mechanical action being taken up by the bearing 8, in particular by the frame 9 on which the bearing is mounted.
- the adjusting system 1 may also comprise a spring 3.
- the spring 3 is for example mounted in abutment against the threaded element 2 and is arranged so as to transmit the mechanical action to the rod 7.
- the spring 3 is of helical type.
- the spring 3 can be of any other nature such as for example a stacking resilient washers or spring washers or a member of elastomeric material such as a tube of elastomeric material.
- the spring may have a stiffness of between 0.1 and 0.5 N / mm, for example 0.2 N / mm.
- the spring makes it possible to generate an axial force of between 0.02 N and 0.2N. For example, it is possible to vary the axial force from 0.05 N to 0.15 N.
- the threaded element 2 preferably comprises an external thread 21 cooperating with a tapping 91 formed in the frame 9.
- an internal thread or tapping of the threaded element 2 cooperating with an external thread on the frame 9 could also be suitable.
- the threaded element 2 comprises a bore 23, for example a bore 23 of axis coincident, or substantially coincident, with the axis of the threaded element 2.
- the threaded element 2 comprises a placement element 24, for example a countersink, a groove or a groove, facilitating the placement, in particular the centering, of the spring 3.
- the adjustment system 1 further comprises a support shaft 4 of axis coincident with or substantially coincidental with the axis A.
- the spring 3 bears against the support shaft 4 of FIG. so as to transmit an axial force to the support shaft 4.
- the support shaft 4 is provided with a shoulder 41 on which the spring 3 presses.
- the support shaft 4 further comprises an element centering 42 of the spring 3 at the shoulder 41, for example a centering element 42 having a conical portion.
- the system 1 further comprises a portion 5 of the shaft 4, preferably convex, bearing on the rod 7 in the axial direction of the rod 7.
- This portion 5 is at least partially spherical, possibly endowed an end at least partially spherical support.
- the portion may alternatively be conical.
- the system 1 further comprises a portion of the rod 7, preferably convex, on which the shaft 4 supports in the axial direction of the rod 7.
- This portion is at least partially spherical, possibly endowed with one end at least partially spherical support.
- the portion may alternatively be conical.
- the portion is a ball 5, disposed between the support shaft 4 and the rod 7.
- a recess, or an inner cone, may be provided at the end of the support shaft 4 in contact with the ball 5 or at the end of the rod 7 in contact with the ball 5.
- the ball 5 is guided within a bore 10 axis coincident or substantially coincidental with the axis A of the chronograph mobile.
- the bore 10 is for example directly formed in the frame 9 or in a part fixed within the frame 9.
- the bore 10 is dimensioned so that the ball 5 is free to rotate and to translate along this bore 10 and this with a proper operating clearance.
- the bore may receive a cylinder provided for example with a first cone pointing to the rod and / or a second cone pointing to the support shaft.
- the cylinder then replaces ball 5.
- the threaded element 2 is in tight helical connection with the frame 9.
- the advantage of using a convex portion, such as a ball 5, to exert the force on the rod 7 and thus on the chronograph mobile is to limit the friction torque at this level, the contact being made on the A. It follows that the intensity of the friction torque of the first member on the second member is integrally or almost completely determined by the force of the shaft 4 on the rod 7 and the geometry of the contact between the rod and the bearing 8 guiding the rod 7 in rotation relative to the frame. Thus, the force coming from the spring 3 is found between the rod 7 and the second bearing 8. More precisely, the force is concentrated at a friction surface between a stop 7 'of the shoulder type of the rod 7 and the second tier 8.
- a method of adjusting the friction between the first member and the second member, in particular between the chronograph mobile and the frame 9, more precisely between the abutment 7 'of the rod 7 and the second bearing 8, may comprise a step of screwing the threaded element 2 so as to increase the intensity of the friction, in particular to increase the intensity of the torque friction of the first member on the second member.
- a method of adjusting the friction between the first member and the second member, in particular between the chronograph wheel and the frame 9, more precisely between the stop 7 'of the rod 7 and the second bearing 8, may comprise a unscrewing step of the threaded element 2 so as to reduce the intensity of the friction, in particular to reduce the intensity of the friction torque of the first member on the second member.
- the threaded element 2 comprises a bridge-accessible rotary drive cavity 22, for example a bridge-side at the center of the movement, as illustrated in FIG. 3.
- This drive cavity 22 may have any shape, from preferably female, so that it can be rotated easily by a tool having a corresponding male shape, in particular by a screwdriver.
- the bore 23 formed in the threaded element makes it possible to define the maximum compression of the spring 3. Indeed, during the screwing of the threaded element, the latter is translated along the axis A relative to the shaft 4. It As a result, as the threaded element is screwed, the shaft 4 enters the bore 23. The shaft 4 penetrates into the bore to a point where it forces the tool out of the cavity 22. In this situation, the threaded element can no longer be screwed with the tool. Accordingly, the adjustment method can be implemented from outside the bridge-side movement, or dial side without disassembly of a single component of the movement and / or be implemented nested motion.
- the friction adjustment system has been described applied to adjusting the friction of a seconds wheel of a chronograph. It can be applied to any mobile counter of a chronograph movement.
- the friction adjustment system can still be applied to any adjustment of the friction between a first watchmaking member and a second watchmaking member, such as for example a second-hand mobile, a retrograde display or more broadly any "crazy" or free mobile which must be braked by the addition of a friction torque of precise value and preferably adjustable.
- the system comprises a spring.
- the system may not include spring.
- the threaded element may exert a force directly on the first member or indirectly via a rigid element, such as a support shaft and / or a ball.
- the convex bearing portion may be positioned anywhere between the threaded member and the first member, threaded member and first member included.
- the convex bearing portion 5 can be positioned anywhere between the threaded member and the first member, including threaded member and first member, regardless of the chain of components between the threaded member first. organ.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00335/18A CH714792B1 (fr) | 2018-03-16 | 2018-03-16 | Système de réglage d'une friction entre deux organes horlogers. |
PCT/EP2019/056526 WO2019175373A1 (fr) | 2018-03-16 | 2019-03-15 | Système de réglage d'une friction |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3765923A1 true EP3765923A1 (fr) | 2021-01-20 |
Family
ID=61971873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19713718.5A Pending EP3765923A1 (fr) | 2018-03-16 | 2019-03-15 | Système de réglage d'une friction |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3765923A1 (fr) |
JP (1) | JP7324218B2 (fr) |
CN (1) | CN112219170B (fr) |
CH (1) | CH714792B1 (fr) |
WO (1) | WO2019175373A1 (fr) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1140319A (fr) * | 1956-01-23 | 1957-07-19 | Montre à compteur de minutes | |
US3099502A (en) * | 1959-06-11 | 1963-07-30 | Seitz & Co | Shock-absorbing pivot bearing |
FR1354567A (fr) * | 1963-04-13 | 1964-03-06 | Dispositif de montage d'un palier dans un bâti de pièce d'horlogerie | |
CH577204B5 (fr) * | 1973-08-31 | 1976-06-30 | Dubois & Depraz Sa | |
CH661404GA3 (en) * | 1985-01-23 | 1987-07-31 | Chronograph watch | |
CH689027A5 (fr) * | 1995-01-23 | 1998-07-31 | Dubois & Depraz Sa | Pièce d'horlogerie à module additionnel et à organe de quantième. |
EP1962155B1 (fr) * | 2007-02-22 | 2010-11-10 | ETA SA Manufacture Horlogère Suisse | Montre chronographe |
JP5455115B2 (ja) * | 2009-10-07 | 2014-03-26 | セイコーインスツル株式会社 | 時計用軸受、ムーブメントおよび携帯用時計 |
EP3059643B1 (fr) * | 2015-02-23 | 2017-07-19 | Montres Breguet S.A. | Mécanisme de chronographe |
-
2018
- 2018-03-16 CH CH00335/18A patent/CH714792B1/fr unknown
-
2019
- 2019-03-15 CN CN201980019573.XA patent/CN112219170B/zh active Active
- 2019-03-15 EP EP19713718.5A patent/EP3765923A1/fr active Pending
- 2019-03-15 JP JP2020549688A patent/JP7324218B2/ja active Active
- 2019-03-15 WO PCT/EP2019/056526 patent/WO2019175373A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
CN112219170B (zh) | 2023-11-03 |
WO2019175373A1 (fr) | 2019-09-19 |
JP7324218B2 (ja) | 2023-08-09 |
CH714792A1 (fr) | 2019-09-30 |
CH714792B1 (fr) | 2022-08-31 |
CN112219170A (zh) | 2021-01-12 |
JP2021515898A (ja) | 2021-06-24 |
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