EP0458175A1 - Getriebemechanismus, insbesondere für eine Uhr - Google Patents

Getriebemechanismus, insbesondere für eine Uhr Download PDF

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Publication number
EP0458175A1
EP0458175A1 EP91107825A EP91107825A EP0458175A1 EP 0458175 A1 EP0458175 A1 EP 0458175A1 EP 91107825 A EP91107825 A EP 91107825A EP 91107825 A EP91107825 A EP 91107825A EP 0458175 A1 EP0458175 A1 EP 0458175A1
Authority
EP
European Patent Office
Prior art keywords
mobile
gear mechanism
cam
mechanism according
gear
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.)
Granted
Application number
EP91107825A
Other languages
English (en)
French (fr)
Other versions
EP0458175B1 (de
Inventor
Alphonse Bron
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
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
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 Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical Ebauchesfabrik ETA AG
Publication of EP0458175A1 publication Critical patent/EP0458175A1/de
Application granted granted Critical
Publication of EP0458175B1 publication Critical patent/EP0458175B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/027—Wheels; Pinions; Spindles; Pivots planar toothing: shape and design

Definitions

  • the present invention relates to a gear mechanism, in particular for a timepiece.
  • Heart-shaped cams are very commonly used in watchmaking, especially in chronographs and are then called "chronograph heart".
  • the heart is fixed on the wheel of a chronograph counter and allows the needle of this counter to be reset to zero after the chronograph is started and stopped.
  • FIGS 1 to 6 of the accompanying drawings illustrate other constructions of heart-shaped cams of the prior art, as well as their operation.
  • the profile of the heart 1 has a point 2 and, in contrast, two rounded lateral surfaces 3 and 4, called shoulders.
  • This core has, substantially between the two shoulders 3 and 4, an orifice 5 whose axis is perpendicular to the general plane of the cam and which allows the fixing of this core on the axis 6 of the wheel 7 of a counter, for example, the second counter or the minute counter of a chronograph.
  • shoulders 3 and 4 can also be slightly pointed.
  • FIGs 3a to 3d illustrate a top view of the successive conventional steps of resetting a chronograph counter, using such a heart-shaped cam.
  • This reset is carried out by a hammer 8 having at one of its ends an inclined 9 and pivoting at its other end around a fixed axis 10.
  • the needle of the counter shown diagrammatically is fixed on the axis 6 of the wheel 7 and bears the reference 11.
  • the hammer 8 is pivoted in the direction of the arrow F until its incline 9 comes into contact with the periphery of the core 1.
  • the hammer being coupled to a reset push button, one can exert a force which is transmitted on the heart 1 and as the latter is eccentric with respect to the axis 6, it pivots easily (figure 3c), until that the incline 9 comes into contact with the two shoulders 3 and 4 (see figure 3d). In this position, the needle 11 is returned to its original or reference position.
  • the core 1 therefore has only the function of resetting the wheel 7 of the counter to zero. Furthermore, as already mentioned above, it is often necessary, from this counter wheel 7, which is, for example, a seconds counter, to drive another wheel, for example, that of a minute counter.
  • FIG. 4 illustrates the techniques of the prior art making it possible to drive this second counter wheel.
  • a drive finger 12 which projects beyond the periphery of the cam so as to be able to mesh with an intermediate wheel 13 which in turn meshes with a second wheel counter 14 itself provided with a heart 15.
  • the hammer 8 is not in contact with the heart 1 and the wheel 7 can therefore rotate, also driving the wheels 13 and 14 through with his finger drive 12.
  • the drive finger 12 allows the wheels 13 and 14 to be rotated by one step.
  • the drive finger 12 is placed outside the plane of the heart, to mesh with the wheel 13 and not to interfere with the action of the hammer 8.
  • this drive finger 12 was placed directly on the upper face of the wheel 7 of the counter, in the same plane as the core 1, it would in some cases risk being in the path of the hammer 8 during delivery. to zero, making it impossible.
  • the invention relates to a gear mechanism comprising a first rotary mobile and at least a second rotary mobile, said first mobile being intended to be brought, by means of a driving force, into a final position from a position. initial, said first mobile comprising a toothed wheel to which said motive force can be applied, this toothed wheel being mounted on an axis, a cam which is integral in rotation therewith as meshing means intended to be engaged with said second mobile to advance it with a predetermined reduction ratio relative to said first mobile, the gear mechanism also comprising means cooperating with said cam to bring said first mobile into its initial position.
  • said engagement means intended to be engaged with the second mobile part of the profile of said cam.
  • the heart has two functions, not only the classic reset function, but also the function of driving other gear mobiles.
  • the construction of the mechanism is simplified, the number of parts necessary to obtain the same functions is reduced and, moreover, space is gained in height since it is possible to dispense with the drive finger being outside the plane of the cam. .
  • This last property conferred by the invention is particularly advantageous in its application to a chronograph mechanism whose height is always sought to be reduced as much as possible.
  • FIG. 7 illustrates a gear mechanism according to the invention applied in a chronograph mechanism.
  • the gear mechanism is mounted between a plate 20 and a bridge 22.
  • the mechanism comprises a first mobile 24 forming in this case the seconds counter and which comprises an axis 26 rotatably mounted in a barrel 28 fixed in the bridge 22.
  • On the axis 26 is mounted a toothed wheel 30 to which one can apply a driving force coming from a clockwork mechanism not shown, so as to drive the first mobile 24.
  • a heart-shaped cam 32 is integral in rotation with the wheel 30.
  • the mechanism also includes a second mobile 34 which, as will be explained below, is coupled to the first mobile 24 with a predetermined reduction ratio.
  • the gear mechanism also includes means 36 cooperating with said cam 32 to return the first mobile 24 to its initial position.
  • these means 36 comprise a hammer, articulated on the plate 20 at a location not visible in FIG. 7.
  • FIG. 6 illustrates the comparison between the profile of a conventional heart 1, symmetrical, represented in dashed lines and the profile of the heart 32 according to the invention, asymmetrical.
  • the heart 32 has a point 38, and two shoulders 40 and 42.
  • the heart 32 according to the invention being asymmetrical, it has a left half 44G and a right half 44D with a curvature different from that of the left half 44G.
  • the tip 38 is different from that of the conventional core 1, since it has a straight edge 46 on the left and a concave edge 48 on the right.
  • the tip 38 of the heart 32 meshes with the teeth of the second mobile 34, which here is an intermediate wheel.
  • this point 38 is part of the profile of the cam 32 and serves as a meshing means for advancing the second mobile 34.
  • FIG. 7 shows that this second mobile can move axially so that it can be brought out of the plane of the cam 32 under the action of a blade 50 which can lift it while the hammer 36 acts on the cam 32.
  • the second mobile 34 in turn meshes with a third mobile 52 having an axis 54 on which are wedged a wheel 56 and a cam 58.
  • a description will be found in patent application No. 01261 / 90-7 of the applicant more precise of these elements.
  • the first mobile 24 is for example a seconds counter, while the third mobile 52 is a minutes counter.
  • the reduction ratio between the two counters is then 60: 1.
  • the concave leading edge 48 of the tip 38 engages with one of the teeth 60 of the second mobile 34, for example and as shown in FIG. 5, the tooth 60a.
  • the tip 38 of the heart 32 therefore advances the tooth 60a by a half-step counterclockwise to a position located between the original positions of the teeth 60a and 60b (shown in dotted lines). ).
  • the third mobile 52 is also driven in rotation and the wheel 56 moves half a step in the direction of the arrow F '.
  • this wheel 56 is positioned by a jumper 57 which is in a stable position only when its end is placed between two teeth, of said toothed wheel 56.
  • This jumper 57 then being in an unstable position will therefore cause the wheel 56 to move half a additional step in direction F 'to return to its stable position.
  • This rotation of the wheel 56 also causes the displacement of a half step of the mobile 34.
  • the tooth 60a then takes the initial position of the tooth 60b.
  • each rotation of a revolution of the first mobile 24 causes a rotation of the second mobile 34 by two half-steps, the movement of a first half-step being effected by the core 32 and that of the second half-step via the jumper 57.
  • the profile of the tip 38 of the cam 32 adapts perfectly to that of the end of the tooth 60, thus guaranteeing good training.
  • the first mobile 24 is then returned to the initial position, using the hammer 36, as described above with reference to FIGS. 3a to 3d. Note however that the first mobile 24 can be returned to its initial position as well by a rotation in the clockwise direction as by a rotation in the opposite direction.
  • FIG. 8 illustrates the return to the initial position in the particular case where the hammer 36 and more particularly its front tip 62, meets the concave edge 48 of the tip 38 of the heart 32.
  • F1 represents the force applied by the hammer 36 perpendicular to the surface of the concave edge 48 and that d1 is the distance from the axis 64 of rotation of the mobile 24 to the normal of F1
  • the moment M1 exerted by the hammer 36 on the core 32 is equal to F1 x d1.
  • F2 represents the force exerted by the hammer 36 perpendicular to the edge of the tip of a conventional core 1 (shown in dashed lines) and that d2 is the distance from the axis 64 to the normal of F2
  • the moment M2 equal to F2 x d2 is less than the moment M1.
  • the particular shape of the tip 38 of the heart 32 therefore improves the return to the initial position of the mobile. Note that the latter then rotates counterclockwise (arrow direction F '').
  • FIG. 9 illustrates the particular case where the hammer 36 meets the tip 38 of the heart 32.
  • the moment M1 is only slightly greater than the moment M2 but this nevertheless results in a slight improvement in the return to the initial position.
  • the mobile 24 is driven clockwise (direction F ').
  • the tip 22 of the heart 20B could have two concave edges 48 (see FIG. 10).

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Physical Vapour Deposition (AREA)
  • Adornments (AREA)
  • Measurement Of Predetermined Time Intervals (AREA)
  • Gears, Cams (AREA)
  • Table Equipment (AREA)
  • Electromechanical Clocks (AREA)
  • Gear Transmission (AREA)
EP91107825A 1990-05-21 1991-05-15 Getriebemechanismus, insbesondere für eine Uhr Expired - Lifetime EP0458175B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1716/90A CH680034B5 (de) 1990-05-21 1990-05-21
CH1716/90 1990-05-21

Publications (2)

Publication Number Publication Date
EP0458175A1 true EP0458175A1 (de) 1991-11-27
EP0458175B1 EP0458175B1 (de) 1994-12-21

Family

ID=4216931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107825A Expired - Lifetime EP0458175B1 (de) 1990-05-21 1991-05-15 Getriebemechanismus, insbesondere für eine Uhr

Country Status (7)

Country Link
US (1) US5280460A (de)
EP (1) EP0458175B1 (de)
JP (1) JPH04231893A (de)
CN (1) CN1029430C (de)
CH (1) CH680034B5 (de)
DE (1) DE69106043T2 (de)
HK (1) HK1000148A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101763027B (zh) * 2008-12-25 2013-03-27 精工电子有限公司 计时器表

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0853264A3 (de) 1997-01-10 1999-11-24 Eta SA Fabriques d'Ebauches Chronographuhr mit einem Mechanismus mit reduzierter Höhe
CN100385352C (zh) * 2001-03-21 2008-04-30 格拉舒特钟表厂有限责任公司 具有两个旋转方向的计时器
US7758594B2 (en) * 2005-05-20 2010-07-20 Neotract, Inc. Devices, systems and methods for treating benign prostatic hyperplasia and other conditions
US8157815B2 (en) * 2005-05-20 2012-04-17 Neotract, Inc. Integrated handle assembly for anchor delivery system
CN108346230A (zh) * 2017-01-23 2018-07-31 深圳市祈飞科技有限公司 落杯落盖装置及饮料自动售卖机
CN111258202B (zh) * 2018-11-30 2023-09-05 天津海鸥表业集团有限公司 一种适用于手表的间歇性往复运动机构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH197349A (fr) * 1937-06-07 1938-04-30 Jacot Guyot Henri Pièce d'horlogerie.
CH223717A (de) * 1941-06-13 1942-09-30 Mido Ag Sekundenzählvorrichtung an einer Uhr.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH678911B5 (de) * 1990-04-12 1992-05-29 Ebauchesfabrik Eta Ag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH197349A (fr) * 1937-06-07 1938-04-30 Jacot Guyot Henri Pièce d'horlogerie.
CH223717A (de) * 1941-06-13 1942-09-30 Mido Ag Sekundenzählvorrichtung an einer Uhr.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101763027B (zh) * 2008-12-25 2013-03-27 精工电子有限公司 计时器表

Also Published As

Publication number Publication date
CN1029430C (zh) 1995-08-02
US5280460A (en) 1994-01-18
JPH04231893A (ja) 1992-08-20
HK1000148A1 (en) 1997-12-24
DE69106043D1 (de) 1995-02-02
EP0458175B1 (de) 1994-12-21
CN1056755A (zh) 1991-12-04
CH680034B5 (de) 1992-12-15
CH680034GA3 (de) 1992-06-15
DE69106043T2 (de) 1995-08-03

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