EP1248164A1 - Uhrwerk - Google Patents

Uhrwerk Download PDF

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Publication number
EP1248164A1
EP1248164A1 EP01201246A EP01201246A EP1248164A1 EP 1248164 A1 EP1248164 A1 EP 1248164A1 EP 01201246 A EP01201246 A EP 01201246A EP 01201246 A EP01201246 A EP 01201246A EP 1248164 A1 EP1248164 A1 EP 1248164A1
Authority
EP
European Patent Office
Prior art keywords
wheel
movement
roadway
barrel
barrel wheel
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
EP01201246A
Other languages
English (en)
French (fr)
Other versions
EP1248164B1 (de
Inventor
Marco Bettelini
Theodor Schoenenberger
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 Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse, Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical ETA SA Manufacture Horlogere Suisse
Priority to DE2001612036 priority Critical patent/DE60112036T2/de
Priority to EP20010201246 priority patent/EP1248164B1/de
Publication of EP1248164A1 publication Critical patent/EP1248164A1/de
Application granted granted Critical
Publication of EP1248164B1 publication Critical patent/EP1248164B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • 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

Definitions

  • the present invention relates to a movement for a timepiece comprising a plate, a needle display device, a gear train connecting drive means to said needles, said train comprising a wheel drive engaged at least indirectly with said drive means and integral with a roadway pivoting on a tenon mounted in a gear train, a cannon wheel arranged on the roadway and pivoted on the plate, the wheel drive and the barrel wheel extending on either side of said plate.
  • Figure 1 schematically represents part of a movement with second in the center as described in the prior art.
  • This figure 1 lets appear the relative positions of the time display mobiles.
  • a second mobile 101 pivotally mounted in a stone 102, itself driven out in a gear train 103.
  • the axis 104 of the second mobile is arranged in a center tube 105, said center tube 105 being driven through a plate 106.
  • the second axis 104 has, in its middle part, an annular bulge 107 having a diameter substantially equal to the inside diameter of the center tube 105.
  • Said center tube 105 thus fulfills the function of radial guide for the axis of second 104.
  • the pavement 108 is rotatably mounted on said center tube 105, the base of the pavement 108 resting on the top of the plate 106. It may be noted that the center tube 105 also fulfills a radial guide function for the roadway 108.
  • the pinion of the roadway 109 meshes with a timer wheel 110, secured to a timer pinion 111 which meshes with a barrel wheel 112.
  • Said gun wheel 112 is rotatably mounted on pavement 108 which therefore serves it radial guide.
  • FIG. 1 A first drawback that presents such a type of movement appears FIG. 1 and relates to manufacturers of timepiece movements, in especially when they deliver these movements to customers who then follow them in watch cases of their choice.
  • the cannon wheel is disposed on said plate, therefore outside the movement.
  • said barrel wheel since said barrel wheel must be free to rotate around the roadway, it is typically simply "strung" on said roadway, and therefore free axially. As a result, the barrel wheel is likely to come off its taken with the timer pinion during transport from the manufacturer of movement at his client's. More specifically, during the assembly process of the timepiece, the dial is generally pressed on the movement.
  • the teeth of the barrel wheel can deform due to their pressure against the timer gear.
  • the wheel barrel is sometimes made of plastic and its teeth may then become break when fitting the dial, if the toothing of the barrel wheel is not engaged correct with that of the timer pinion.
  • the customer is obliged, before installing the dial, to carry out an automatic or manual control of the correct positioning of the barrel wheel if he does not want to risk malfunctions of the part watchmaking following damage to the movement. This control step essential leads to an increase in the duration and cost of manufacturing the final product.
  • the cannon wheel can disengage entirely from the roadway and lose during transport of movements to the nesting station, which also generates additional production costs.
  • a known solution of the prior art to remedy this problem consists in: add a washer to the pavement tube once the barrel wheel is set place, so as to block the latter axially.
  • this solution presents a disadvantage in that it requires the manufacture of an additional part, typically a washer, and the implementation of an additional step in the movement mounting method, to install said washer.
  • the main object of the present invention is therefore to overcome the drawbacks of the aforementioned prior art by providing a movement for a timepiece, making it possible in particular to ensure that the barrel wheel remains in engagement with the timer pinion during movement movements before operation casing.
  • the invention relates to a movement for a timepiece of the type mentioned above, characterized by the fact that the cannon wheel and the roadway respectively comprise complementary means for axially retaining the cannon wheel on the roadway.
  • the structure according to the invention makes it possible to prevent the barrel wheel from coming off the pavement during the transport stage and therefore it is lost or damaged during the installation of the dial, while removing the mentioned control step previously.
  • An additional advantage of the invention comes from the fact that the means of barrel wheel retainer on the pavement tube are integral parts of these two elements. The realization of the retaining means therefore does not require the setting implementation of an additional step, as such, in the manufacturing process movement.
  • said means for retainers are of the notch type. They may in particular include a bead and a complementary grooves, respectively formed on the barrel wheel tube and on the road tube, for example.
  • An additional advantage of the present invention is that said bead is produced by an excess thickness of material on the tube of the wheel barrel, said excess thickness being situated substantially at the level at which the needle of the hours is then chased. Indeed, chasing a needle generally gives creep of material on its support which can increase over time. This phenomenon can cause the needle to play with its support, or even the detachment of the needle from its support. Thanks to the tube structure of the wheel gun according to the invention, in particular by virtue of said excess thickness, the flow of material on the tube is limited and good maintenance of the hour hand is ensured in the time.
  • the present invention therefore also aims to overcome the drawbacks of the aforementioned prior art by providing a movement for a timepiece with an acceptable quality of manufacture at a low cost price.
  • the invention also relates to a movement for coin of the type mentioned above, characterized in that it does not include center tube and an annular shoulder is provided on the plate of the movement serving as a radial guide for the cannon wheel.
  • a movement for coin of the type mentioned above characterized in that it does not include center tube and an annular shoulder is provided on the plate of the movement serving as a radial guide for the cannon wheel.
  • the various uncertainties mentioned above have been partly dissociated insofar as the roadway no longer fulfills the function of a radial guide for the barrel wheel. Therefore, the radial clearance existing at the level of the barrel wheel does not absolutely not dependent on the radial uncertainties inherent in the manufacture of the mobile second and pavement. Thus, the radial clearance of the axis of rotation of the needle of the hours can be appropriately controlled, regardless of the existing uncertainties on the second mobile and the road.
  • the barrel wheel 1 has a structure conventional.
  • Three radial extensions 2 connect the toothed wheel 3 to the barrel 4.
  • three arms 5 substantially in the form of arcs of a circle, each extending from one of said radial extensions 2. These arms 5 have the function of regulating the axial positioning relative of the cannon wheel 1 and the roadway (not shown in this figure) thus eliminating the need for a tinsel spring, usually used for perform this function.
  • Figure 2 also shows the special characteristics of the barrel wheel 1, namely the fact that the inside of its barrel 4 has a bead ring finger 6.
  • Figure 3 provides a better understanding of the advantage of said bead 6 since it is shown in its service position, that is to say when the wheel 1 is located on pavement 7.
  • the movement for a timepiece partially visible in this figure is of type with central second.
  • the cog bridge 8 carries stones 10, in which are pivotally mounted mobile.
  • the second mobile 11 is driven by an exhaust pinion (not shown) via the second wheel 13.
  • the second pinion 14 meshes with a medium wheel (not shown) secured to a medium gear (not shown) being engaged with the drive wheel 15, mounted at friction on the roadway 7.
  • the roadway 7, arranged directly on the mobile of second 11, then transmits its rotational movement to timer 12 via the wheel timer 16.
  • the radial guidance of the roadway 7 is carried out directly by the second mobile 11, via two annular beads 17 formed on the axis of second 18.
  • the timer pinion 19, passing through an orifice 20 formed through the plate 9, is engaged with the barrel wheel 1, disposed on top of said cage, and communicates its rotational movement to it.
  • said barrel wheel 1 is mounted free to rotate on the roadway 7.
  • the barrel wheel 1 and the roadway 7 comprise respectively complementary means for axially retaining said wheel at cannon 1 on carriageway 7, in particular during the transport stages.
  • Said means complementary are of the notched type, more precisely, the roadway tube 21 comprises opposite the bead 6 of the barrel wheel 1 an annular groove 22 of complementary form.
  • the external face of the plate 9 further comprises an annular shoulder 23 serving as a radial positioning guide for said barrel wheel 1.
  • the barrel wheel 1 is placed on the roadway 7 by "clipping", that is to say by elastic deformation of material.
  • the cannon wheel 1 is first threaded onto the roadway 7 until the bead 6 of the wheel barrel abuts on a bead 23 located immediately above the groove 22 of the pavement tube 21.
  • a slight pressure on the barrel wheel 1 causes the elastic deformation of the barrel 4, allowing the bead 6 to cross said bead 23 and to be received in the groove 22, which ensures the establishment of said barrel wheel 1 on the plate 9.
  • said wheel Cannon 1 cannot disengage itself from its location during transport.
  • the step of setting up the cannon wheel 1 on the roadway 7 does not does not require modification of the conventional mounting method, due to the simplicity and ingenuity of the retaining means 6, 22.
  • the annular bead 6 formed in the tube 4 of the barrel wheel 1 is constituted by an excess thickness of material and not simply by deformation. This characteristic has the important consequence that the material creep which takes place, at the time of the fitting of the hour hand (not shown), is located at said extra thickness. The deformation undergone by the barrel wheel 1 during this mounting step is therefore limited to this region. Of more, once the needle in place, the material creep continues slowly during of time and the existence of said allowance, arranged at the same level as the needle, gives the needle positioning better resistance over time than in the case of a conventional barrel wheel tube.
  • the timer mobile 12 is preferably made of steel, brass or plastic, while the roadway 7 is made of steel or brass and that the barrel wheel 1 is made of material plastic, such as polyoxymethylene or a polyacetal.
  • material plastic such as polyoxymethylene or a polyacetal.
  • the barrel wheel 1 is guided radially by an annular shoulder 23 formed on the top of the plate 9 and no longer by pavement 7, as is typically the case in the prior art.
  • the having significant uncertainties on the radial dimensions of the axis of second 18 and of the roadway tube 21 no longer influences the free rotation of the barrel wheel 1 thanks to the structure according to the invention, visible in FIG. 3.
  • This particularity allows the manufacturer to settle for relatively high tolerances with regard to the radial dimensions of the second axis 18, of the tube pavement 21 and tube 4 of the cannon wheel 1.
  • This technical advantage contributes also to lower the cost price of the movement according to the invention and allows thus to realize cheap movements.
  • the movement described here is of the type with center seconds but we can obviously adapt the structure according to the invention to a movement without seconds in the center, where the second mobile is simply replaced by a central tenon.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
EP20010201246 2001-04-03 2001-04-03 Uhrwerk Expired - Lifetime EP1248164B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2001612036 DE60112036T2 (de) 2001-04-03 2001-04-03 Uhrwerk
EP20010201246 EP1248164B1 (de) 2001-04-03 2001-04-03 Uhrwerk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20010201246 EP1248164B1 (de) 2001-04-03 2001-04-03 Uhrwerk

Publications (2)

Publication Number Publication Date
EP1248164A1 true EP1248164A1 (de) 2002-10-09
EP1248164B1 EP1248164B1 (de) 2005-07-20

Family

ID=8180103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010201246 Expired - Lifetime EP1248164B1 (de) 2001-04-03 2001-04-03 Uhrwerk

Country Status (2)

Country Link
EP (1) EP1248164B1 (de)
DE (1) DE60112036T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110083045A (zh) * 2018-11-10 2019-08-02 福州小神龙表业技术研发有限公司 一种钟表分轮结构及其分轮管制造方法
EP3896533A1 (de) * 2020-04-17 2021-10-20 Patek Philippe SA Genève Zeigerrohr einer uhr

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3185089B1 (de) * 2015-12-21 2019-03-06 ETA SA Manufacture Horlogère Suisse Motormodul für armbanduhr

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH212585A (fr) * 1940-03-28 1940-11-30 Longines Montres Comp D Mécanisme de montre chronographe.
FR2433194A1 (fr) * 1978-08-11 1980-03-07 Inst Chasovoi Promyshlennost Reducteur de montre electronique a moteur pas-a-pas et aiguille des secondes centrale
US4636087A (en) * 1985-01-29 1987-01-13 Casio Computer Co., Ltd. Gear train mechanism stop device of timepiece
US5155712A (en) * 1992-04-20 1992-10-13 Timex Corporation Wheel and pinion assembly with friction drive/slip coupling for a timepiece

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH212585A (fr) * 1940-03-28 1940-11-30 Longines Montres Comp D Mécanisme de montre chronographe.
FR2433194A1 (fr) * 1978-08-11 1980-03-07 Inst Chasovoi Promyshlennost Reducteur de montre electronique a moteur pas-a-pas et aiguille des secondes centrale
US4636087A (en) * 1985-01-29 1987-01-13 Casio Computer Co., Ltd. Gear train mechanism stop device of timepiece
US5155712A (en) * 1992-04-20 1992-10-13 Timex Corporation Wheel and pinion assembly with friction drive/slip coupling for a timepiece

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110083045A (zh) * 2018-11-10 2019-08-02 福州小神龙表业技术研发有限公司 一种钟表分轮结构及其分轮管制造方法
EP3896533A1 (de) * 2020-04-17 2021-10-20 Patek Philippe SA Genève Zeigerrohr einer uhr

Also Published As

Publication number Publication date
DE60112036T2 (de) 2006-06-01
DE60112036D1 (de) 2005-08-25
EP1248164B1 (de) 2005-07-20

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