EP2796939A1 - Stab mit gebrochenen Elementen, und entsprechendes Zusammenbauverfahren - Google Patents

Stab mit gebrochenen Elementen, und entsprechendes Zusammenbauverfahren Download PDF

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Publication number
EP2796939A1
EP2796939A1 EP20130164992 EP13164992A EP2796939A1 EP 2796939 A1 EP2796939 A1 EP 2796939A1 EP 20130164992 EP20130164992 EP 20130164992 EP 13164992 A EP13164992 A EP 13164992A EP 2796939 A1 EP2796939 A1 EP 2796939A1
Authority
EP
European Patent Office
Prior art keywords
rod
distal end
welding
proximal
fixing
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
EP20130164992
Other languages
English (en)
French (fr)
Other versions
EP2796939B1 (de
Inventor
David Benjamin Kraehenbuehl
Jonathan Collaud
Marco Bettelini
André Nussbaum
Daniel Gruenig
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 Manufacture Horlogere Suisse SA
Original Assignee
ETA Manufacture Horlogere Suisse SA
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 Manufacture Horlogere Suisse SA filed Critical ETA Manufacture Horlogere Suisse SA
Priority to EP13164992.3A priority Critical patent/EP2796939B1/de
Publication of EP2796939A1 publication Critical patent/EP2796939A1/de
Application granted granted Critical
Publication of EP2796939B1 publication Critical patent/EP2796939B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/04—Rigidly-mounted keys, knobs or crowns
    • G04B3/041—Construction of crowns for rotating movement; connection with the winding stem; winding stems

Definitions

  • the present invention relates to a particular method of assembly for a stem of a timepiece.
  • a rod is used, the first part of which is coupled to the movement, and housed in the middle with the rest of the movement, to which is added, at its free end, a second portion introduced by its proximal end through an orifice of the build.
  • This second part also typically comprises, at its distal end, a gripping ring to allow the user to perform particular adjustment operations.
  • the coupling between the portion of the rod secured to the movement and that comprising the crown is generally made using elements male and female, for example by screwing or by driving.
  • Each of these two mounting methods has drawbacks respectively in terms of cost and reliability of assembly. Indeed, if a screw mounting is preferred, it is necessary to perform the machining operation, performed in the context of the machining of threads and tappings of the rod assembly parts, with extreme precision to guarantee a sufficient tightening torque at the end of the stroke, to maintain the assembled position even in case of shock, vibration or significant thermal variations, which is very expensive.
  • the present invention relates to a method for assembling a rod in two parts of a timepiece, the rod comprising a first portion provided with a first proximal end cooperating with a movement, and a first distal end of attachment, and a second portion provided with a second proximal end of attachment and a second distal end, characterized in that it contains a step of welding or bonding the first distal end of attachment of the first portion of the shaft at the second proximal end of attachment of said second portion of the shaft.
  • the invention also relates to a two-part stem of a timepiece comprising a first part provided with a first proximal end cooperating with a movement, and a first distal end of attachment, and a second part provided with a a second proximal end of attachment and a second distal end, the first distal end of attachment of the first portion of the shaft being welded or glued to the second proximal end of attachment of the second portion of the shaft.
  • An advantage of the present invention is to provide a more effective, safe and durable method and fastening device for a broken stem of a timepiece.
  • the risk of rupture, particularly during operations of axial drawing of the crown by the user is almost eliminated, and the rod is more resistant to all other constraints normal use of a watch in terms of shock, vibration and thermal variations.
  • Another advantage of the proposed solution is that it makes it easier to mount the part of the rod out of the plate, while hiding the mounting location in the middle part, without risk of damaging the movement, but while ensuring nevertheless a solid fixation and a better life.
  • Yet another advantage of the proposed solution is not to slow down the rate of production, the proposed assembly operation can be performed on a production line in a period substantially equivalent to that corresponding to a screwing operation or hunting.
  • FIGS. 1A, 1B and 1C show the two parts of a rod 10 before assembly, the Figure 1B being a sectional view of the Figure 1A along the AA axis.
  • the Figure 1A is a side view of each of these parts, the left part constituting a first part 1 of the rod intended to be coupled to the movement, here via the gear wheel 13 (better visible on the figure 1C perspective), while the right part is a second portion 2 to be manipulated by the user, here through a ring 23 arranged at its end.
  • proximal end is called the one closest to the center of the watch in which the rod is intended to be housed, and respectively by distal end that which is located in the further from the center of the watch. It is therefore moved with increasing radius relative to the center of the watch to go from the proximal end to the distal end.
  • the rod according to the preferred embodiment of the invention illustrated by the FIGS. 1A, 1B and 1C in disassembled position and by FIGS. 2A, 2B, 2C is thus a rod for a watch, such as for example a fully mechanical watch winding stem or a simple time-setting rod for a quartz watch, whose gear wheel 13 with the movement is arranged at the level of a first proximal end 11 of the first portion 1 of the rod, while the ring 23 for gripping and manipulation is arranged at a second distal end 22 of the second portion 2 of the rod.
  • a series of splines 17 is arranged on the first part 1 of the rod to allow the positioning of a jumper - not shown - determining different axial positions of the rod.
  • three splines can be distinguished which can for example correspond to a current operating mode, a fast date correction mode and a time setting mode.
  • a groove 26 can moreover be arranged on the second part 2 of the rod to typically accommodate a seal 5, not shown on the Figures 1A-C and 2A-C but visible on the figure 3 .
  • the assembly of the first and second parts of the rod is performed at the first distal end 12 of the first portion 1 and the second proximal end 21 of the second portion 2 of the rod, by introducing a pin 25 arranged on the second portion 2 of the rod in a blind hole 16 arranged in the first distal end 12 of the first portion 1 of the rod.
  • This casing operation may or may not be accompanied by a slight driving of the post 26 in the hole 16, but does not require very precise machining tolerances for the correspondence between the diameter of the hole 16 and that of the post 25, because the final fixing operation is performed during a subsequent welding operation, illustrated in particular by the Figures 2A, 2B described below.
  • each of the parts of the rod also contains bearing surfaces, intended to be brought into contact with each other before the welding operation.
  • the first part of the rod 1 comprises a first annular support surface 14 surrounding the hole 16
  • the second part of the rod 2 comprises a second bearing surface 24 surrounding the tenon 25, referenced on the Figures 1A and 1B .
  • the diameter of the first portion 1 of the rod is slightly lower, at the first distal end 12 of fixation, to that of the body of this first portion 1 of the rod.
  • the narrowing of the diameter at this level therefore reveals a shoulder 15, the function of which is notably to prevent the formation of prominent flanges after the welding or bonding operation 100, on the one hand, and on the other hand to be able to affix easily, thanks to the presence of an axial abutment surface provided by the shoulder 15, a clamp for retaining the first portion 1 of the rod coupled to the movement in the middle and thus clear a working crown (not shown) before to mount the second part 2 of the rod.
  • a working crown not shown
  • FIGS. 2A, 2B and 2C show views identical to those of FIGS. 1A, 1B and 1C , first part 1 and second part 2 of the rod 10, but this time with the parts joined to each other.
  • These first part 1 and second part 2 are moreover referenced only on the Figure 2B which is a sectional view of the Figure 1A along the BB axis. It is thus always possible to distinguish the gear wheel 13 at the first proximal end 11 of the first part 1, and the series of splines 17, but the respective bearing surfaces of each of the parts of the rod 10 when the it was mounted following the casing operation 200 of the post 25 of the second part 2 in the hole 16 of the first part 1.
  • This welding or bonding step 100 mutually secures the first annular support surface 14 to the second annular support surface 24 and thus definitively and irreversibly removes any relative degree of freedom in translation and in rotation of the second part 2 of the rod relative to the first part 1 of the rod 10.
  • An advantage of the fastening method proposed between the two parts of the rod is that it requires, in addition to machining tolerances less restrictive compared to a mode fastening by screwing or by driving, not an actual contact between the two bearing surfaces of each of the parts of the rod.
  • a mutual gap between the bearing surfaces of up to 0.1 mm can be tolerated and caught by melting parts, preferably made of metal or plastic.
  • the laser control parameters in terms of power and frequency can in this case be adapted to the nature of the material.
  • the welding operation is preferably performed using a laser operating with a light pipe at 200 micrometers, a power of 250W, and working at a frequency of 15Hz.
  • the welding or bonding step 100 preferably comprises the laying of a first welding point or glue for securing the first portion 1 of the rod to the second portion 2 of the rod. Then, the second portion 2 of the rod is rotated about its axis, for example by means of a gripping tool acting on the ring 23 at an angular speed preferably equal to half a turn per second, such that 30 solder or glue points are formed over the entire periphery of the diameter of the rod, thereby forming a quasi-continuous connection over the entire periphery of the bearing surfaces of each of the parts of the rod.
  • the figure 3 illustrates a rod according to a preferred embodiment, the two parts are secured by a welding or bonding operation 100, preferably a laser welding performed while the first part 1 of the rod is coupled to a movement 4.
  • the operation preliminary casing 200 is in this case also performed while the first part 1 of the rod has been mounted in the plate 3 of the movement 4, itself nested in a middle watch (not shown).
  • the splines 17 determining the discrete axial positions of operation of the rod, but henceforth also a projecting portion 18 out of the plate 3, this protruding portion still remaining preferably inside a watch case, not shown for reasons of legibility, and this in order to always hide the method of attachment and the parts welded or glued from the outside of the case for aesthetic reasons, as for conventional broken rods.
  • On the second part 2 of the rod there is a seal 5 housed preferably in a groove, and the ring 23 gripping for manipulations performed by the user.
  • the welding operation for the mutual attachment of the first and the second part of the rod 10 is performed while the first part 1 of the rod has not only been previously coupled to the movement 4 after being introduced into an orifice 31 of the plate 3 and another through hole of the middle, after the plate 3 and the movement 4 have themselves already been nested in the middle part, but also tested in its various axial operating positions using a rod / working ring - not shown - which is then detached from the first part 1 of the rod with a clamp affixed to the shoulder (not referenced in this figure, but better visible on the Figures 1A-1B ) which allows to retain axially the first part 1 of the rod during removal of the working crown.
  • the rod corresponding to the preferred embodiment illustrated by the previously described figures comprises a simple shoulder 15 (see Figures 1A-1C in particular) at its fixing end
  • a complete groove at the first distal end 12 of fixation such groove comprising an additional retaining surface useful for handling Axial of the rod during preliminary operational tests before the actual welding or bonding operation.
  • this ease of use in terms of handling would nevertheless make parallel welding operation more difficult to achieve because of the small thickness resulting, for a given size of the first portion of the rod, the rim between the new axial stop and the first bearing surface 14 to be welded.
  • the fixing of the two parts of the rod is preferably always carried out outside the plate, because of the welding or bonding operation 100 carried out at the level of the first distal end 12 of attachment of the first part 1 of the rod, and which must not alter other elements of the movement 4.
  • Such an arrangement of a protruding portion 18 could also extend to outside the middle part, However, this would have the disadvantage of no longer hide the assembly mode or welded or glued parts.
  • the rod described corresponds to a winding or setting rod according to the preferred embodiment illustrated, which applies to both a mechanical watch and a quartz watch, it will be understood that the fixing method described applies to other types of rods for timepiece without departing from the scope of the present invention. It will also be understood that not only can laser or ultrasonic welding be envisaged as a technique for permanently and irreversibly mutually securing the two parts of the rod, but also other types of thermal welding, as well as brazing.
EP13164992.3A 2013-04-23 2013-04-23 Stab mit gebrochenen Elementen, und entsprechendes Zusammenbauverfahren Active EP2796939B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13164992.3A EP2796939B1 (de) 2013-04-23 2013-04-23 Stab mit gebrochenen Elementen, und entsprechendes Zusammenbauverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13164992.3A EP2796939B1 (de) 2013-04-23 2013-04-23 Stab mit gebrochenen Elementen, und entsprechendes Zusammenbauverfahren

Publications (2)

Publication Number Publication Date
EP2796939A1 true EP2796939A1 (de) 2014-10-29
EP2796939B1 EP2796939B1 (de) 2022-03-30

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170139376A1 (en) * 2014-06-03 2017-05-18 The Swatch Group Research And Development Ltd Component of external parts for a timepiece made of welded materials
CN109128854A (zh) * 2018-11-13 2019-01-04 珠海罗西尼表业有限公司 手表柄轴装配系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5769271A (en) * 1980-10-20 1982-04-27 Seiko Epson Corp Joining of crown and winding stem for wrist watch
FR2779244A1 (fr) * 1998-05-28 1999-12-03 Cheval Freres Sa Procede d'assemblage d'une couronne de remontoir de montre sur une tige de remontoir
EP2579103A2 (de) * 2011-10-03 2013-04-10 Guenat SA Montres Valgine Steuervorrichtung für Uhrwerk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5769271A (en) * 1980-10-20 1982-04-27 Seiko Epson Corp Joining of crown and winding stem for wrist watch
FR2779244A1 (fr) * 1998-05-28 1999-12-03 Cheval Freres Sa Procede d'assemblage d'une couronne de remontoir de montre sur une tige de remontoir
EP2579103A2 (de) * 2011-10-03 2013-04-10 Guenat SA Montres Valgine Steuervorrichtung für Uhrwerk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170139376A1 (en) * 2014-06-03 2017-05-18 The Swatch Group Research And Development Ltd Component of external parts for a timepiece made of welded materials
CN109128854A (zh) * 2018-11-13 2019-01-04 珠海罗西尼表业有限公司 手表柄轴装配系统

Also Published As

Publication number Publication date
EP2796939B1 (de) 2022-03-30

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