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
  • 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
  • G04B19/00—Indicating the time by visual means
  • G04B19/20—Indicating by numbered bands, drums, discs, or sheets
  • G04B19/202—Indicating by numbered bands, drums, discs, or sheets by means of turning discs
• • 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
  • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
  • G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
  • G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped

Definitions

• the present invention relates to a clock device comprising a drive wheel of a display disk and means for its axial retention.
• a display disc of a timepiece has on its upper face indications intended to face a user, said indications being typically visible through a window of the dial covering it.
• Such a display disk is typically rotated about an axis perpendicular to the plate by a drive wheel to which it is attached. The holding in radial position of said drive wheel and the display disk that it carries is provided by this axis.
• the maintenance in axial position along this axis is, for its part, typically provided, in a first direction from top to bottom (towards the "bridge side"), directly or indirectly, by the plate or by a bridge , and in a second direction from bottom to top (towards the "dial side”) by various means mentioned below.
• a drive wheel carrying a display disk and pivoting about an axis can be held in position in a watch mechanism, axially, in the direction towards the dial, by the dial itself.
• the dial must meet a certain number of criteria. It must especially be very flat and is therefore subject to very precise tolerances (typically between 20pm and 40pm) which are difficult to respect for certain surfaces or for surfaces subject to certain types of decorations such as enameling. The choice of materials for producing such a functional dial are therefore limited. In addition, such tolerances are not compatible with a series of high-end dials, in particular because of the materials and the number of manufacturing steps they require.
• Another possibility for the axial retention of a drive wheel carrying a display disk is the use of a screw, passing through the display disk and the mobile which carries it and typically screwed into the plate or in a bridge.
• This possibility has the advantage of releasing the dial from its holding function but has the disadvantage of occupying part of the upper surface of the display disk, thus limiting the space available for affixing indications on it.
• such an arrangement is not possible when the mobile display is traversed by a tigeron carrying a needle.
• the Swiss patent application CH 712 392 A2 proposes a watch device comprising a toothed wheel secured to a display disk. as well as a holding plate or lever displaceable in translation between a first position in which a locking nose constituting an end of this lever cooperates with a holding ring integral with said display disk for axially holding and guiding this disk in translation. display and a second position in which said display device is not maintained axially.
• a screw locks the lever in said first position.
• Such a device overcomes some of the aforementioned drawbacks, however, there is very little freedom as to the shape of its lever; this device is therefore difficult to adapt to the congestion constraints surrounding the display disc when it is integrated in a watch movement.
• the axial retention of the display disk depends on the overlap surface of the retaining ring by the locking nose.
• extending the arms of the locking nose to increase this surface involves increasing the recoil of the retaining piece to axially release the display disk which may pose difficulties relating to the size of the mechanism.
• An object of the present invention is to provide a clock device comprising a drive wheel carrying a display disk and means for its axial retention within a clock mechanism, overcoming the aforementioned drawbacks.
• the invention proposes a watchmaking device comprising a frame, a driving wheel, a display disk and a holding part, said display disk bearing on its upper face indications intended to face a user. and being rotatably connected to said driving wheel at least partly under its lower face, characterized in that said holding member is arranged to be pivotable about an axis of rotation between a first and a second fixed position by relative to the frame, so that in the first of said two positions, at least a portion of said piece of said portion under the display disk is at least partially facing at least a portion of said drive wheel in the direction of the axis of rotation of the display disk, so as to maintain in axial position the drive wheel and the display disk in the direction from the bottom up, and so that in the second of said two positions, no part of said holding part is opposite said drive wheel in the direction of the axis of rotation of the display disk so as to release the axial displacement of the drive wheel and the display disk in the direction going from the bottom upwards, said device making it possible to fix said holding
• the device according to the invention comprises at least a first and a second fixing means for fixing the holding piece in said first position, said fixing means being arranged so that the smaller angle defined by the center of the first fixing means, the center of rotation of the display disk, and the center of the second fixing means and whose apex corresponds to the center of rotation of the display disk is greater than 45 ° preferably greater than 90 °, preferably greater than 120 °, more preferably greater than 150 °, most preferably substantially 180 °.
• Said fixing means are for example screws.
• Said first position of the holding piece corresponds to a "locking position" of the device and said second position of the holding part corresponds to an "unlocked position" of the device.
• the present invention also proposes a clock mechanism comprising such a device and a timepiece such as a wristwatch, a pocket watch, a pendulum or a clock comprising such a watch mechanism.
• a clock mechanism comprising such a device and a timepiece such as a wristwatch, a pocket watch, a pendulum or a clock comprising such a watch mechanism.
• Any optical contrast for providing information to the user is considered an indication within the meaning of the present invention.
• the upper and lower faces of the display disc respectively define the top and the bottom of the device according to the invention.
• the drive wheel according to the invention comprises at least one part intended to be rotated by a watch mechanism, this part being able for example to be a wheel, preferably toothed, said driving wheel comprising said part and any element thereof. being in solidarity with the exception of the display disk with which it is
• the driving wheel according to the invention can typically comprise a wheel secured to a barrel and / or a bearing surface facilitating the connection with the display disk, it can also be a simple wheel , barrel or barrel, said wheel can for example take the form of a star.
• the wheel in question may not include teeth if it is able to be rotated.
• the device according to the invention has the advantage of being able to axially maintain a mobile display by releasing the dial of this function. This gives more freedom in the design of the dial or even the possibility of removing the dial, for example for the realization of a structure "skeleton".
• such a device has the advantage of showing the entire upper surface of the display disk available to carry indications.
• the device according to the invention also makes it possible, by a guided displacement in rotation of the holding piece in a plane typically perpendicular to the axis of rotation of the display disk, to axially release the driving wheel carrying the display disk so that it can be removed without requiring the separation of the holding part of said watch device and without impacting the axial retention of other mobiles that would also be maintained axially other than by the dial.
• a rotational displacement of the holding piece allows greater freedom in the design of said holding piece that translational movement.
• the displacement of a material point of the holding part is different as a function of its distance from its center of rotation.
• the rotational movement of the holding part thus makes it possible to better adapt to the constraints of space surrounding the display disc when it is integrated in a watch movement while allowing the cover of the drive wheel to be increased. and therefore to allow better axial retention of the assembly.
• FIG. 1 is a section of a part of a watch mechanism incorporating a watch device according to a particular embodiment of the invention
• FIG. 2 is a perspective view from above of a part of the clock device of Figure 1;
• FIG. 3 is a perspective view from below of a part of the watchmaking device of FIG. 1;
• FIGS. 4a and 4b are top views of a variant of the clock device of Figure 1 wherein said device is associated with a jumper, the holding part being respectively in the locking position and in the unlocked position.
• FIG. 1 represents a part of a watch mechanism integrating a watch device 100 according to a particular embodiment of the invention.
• Figures 2 and 3 illustrate only part of this device 100.
• the device 100 comprises a drive wheel 2, a display disc of the day of the week 3, a plate 6, a holding plate 10 and a screw 11 for fixing.
• the driving wheel 2 is here a barrel wheel comprising a toothed gear 2a in the form of a star with seven teeth integral with a barrel 2b.
• the disc of the days 3 is driven on the barrel 2b of the driving wheel 2.
• the driving wheel 2 comprises a central hole 4 traversed by an axle 5 driven into a plate 6 and is free to rotate about this axis 5.
• the axis 5 could be replaced by another barrel forming a simple hollow tube whose light would be traversed by a tigeron, for example carrying a needle, the tigeron would then be free to rotate inside the tube. The tigeron and the needle would typically be rotated by the finishing gear of said watch mechanism.
• the disk of the days 3 has on its upper face 3a indications 9 corresponding to the days of the week. Under its other face, said lower face 3b, is the driving wheel 2.
• the upper face 3a defines the upper face A of the device 100 and is typically intended to be on the "dial side” of a timepiece, that is to say the side facing the user during normal use.
• the other face, called lower face 3b, defines the lower face B of the device 100 and is typically intended to be located on the "bridge side" of a timepiece.
• the drive wheel 2 is kinematically connected to the work train and intended to be rotated at a rate of one turn per week, and to rotate the disc of the days 3 which it is secured.
• the driving wheel 2 is held in a radial position within the watch device by the axis 5 constituting a physical axis around which it pivots, the virtual or imaginary pivot axis of the driving wheel 2 and the disk 3 being designated by A2. It is maintained in axial position, in the direction of the lower face B, that is to say in the direction going from top to bottom, typically directly, by the plate 6 and in the direction of the upper face A, it is in the direction from bottom to top, by the holding plate 10 of the device 100.
• the screw 11 of the device 100 passes through a circular hole 12 of the holding plate 10 and is screwed into a screw thread 13 driven into the plate 6, said plate 6 constituting a frame of the device 100.
• the screw 11 is located outside the portion of the plate 6 which is opposite the display disk 2 (in the direction of the axis A2) in order to be accessible, that is to say screwed and unscrewable, once the display disc 3 the holding plate 10 in place.
• the holding plate 10 of the device 100 comprises a recess 15 also intended to be traversed by a screw 16 screwed into a tapping of the plate 6.
• the screw 16 is located outside of the portion of the plate 6 which is opposite the display disk 3 (in the direction of the axis A2) in order to be accessible, that is to say screwed and unscrewable, once the disk of display 3 and the holding plate 10 in place.
• FIG. 1 illustrates the holding plate 10 in the blocking position, that is to say in the position in which it blocks axially, in the direction from bottom up, the driving wheel 2.
• the screw 11 at least is completely screwed into the screw thread 13 and immobilizes the holding plate 10 by tightening it against the plate 6, that is to say that it makes it integral with the plate 6.
• the screw 16 is also completely screwed into the locking position.
• a second fixing screw such as the screw 16 is not essential.
• a screw strengthens the immobilization of the holding plate 10 and makes the entire device 100 more shock resistant.
• having at least two fastening means of the holding plate 10 arranged on either side of the display disc 3, preferably diametrically opposite to the center of rotation of this disc 3, has the advantage of limiting the bending of the holding plate, in particular in its part participating in the axial retention of the display disc 3, and thus to avoid the frills of the toothed wheel 2a in the up / down direction.
• the smallest angle A1A20 is approximately equal to 165 °. This angle could be different but preferably greater than 45 °, ideally substantially equal to 180 °.
• the holding plate 10 is positioned between the lower face 3b of the disc of the days 3 and the lower face of the driving wheel 2. It typically extends in a plane parallel to the plane in which extends the disk of the days 3. At least a portion (arm 1) of said holding plate 10, said portion lying under the display disk 3, is directly opposite a portion of the driving wheel 2, in the direction of the axis A2 of rotation (virtual) of the display disk 3. Said portion of the drive wheel 2 here corresponds to a portion of the toothed wheel 2a. The cooperation between the holding plate 10 and said portion of the toothed wheel 2a allows axial retention of the drive wheel 2 and the disc of the days 3 in the direction from bottom to top.
• the assembly comprising the holding plate 10 and the screw 11 is located below the plane defined by the upper face 3a of the display disk 3. Thus, it does not create thickening of the mechanism.
• the assembly comprising the holding plate 10 and the screw 11 does not create space between the display disk and said dial.
• the device 100 allows the guided displacement in rotation of the holding plate 10 relative to the plate 6.
• the screw 16 must also be unscrewed.
• the edges of the circular hole 12 are free to pivot against the external diameter of the screw thread 13 in which the screw 11 is screwed, the set of screws 13 / hole 12 constituting a guide system of the plate maintaining rotation 10 around an axis of rotation (virtual) A1 coincides with the axis of the screw 11.
• This configuration corresponds to the position called unlocked position.
• the pivoting of the holding plate 10 makes it possible to be able radially to move the portions of the holding plate 10 and of the driving wheel 2 which are opposite each other in the locking position, so that they are no longer, to release the axial maintenance of the drive wheel 2 in the direction from bottom to top.
• the device 100 is typically mounted within a clock mechanism comprising a jumper 17 for positioning the gear 2a accurately so that the display disc 3 (not shown in this figure), solidarity the star is positioned correctly.
• the holding plate 10 may advantageously carry a pin 18 arranged to lift the jumper 17 against the action of its return spring 19 when the holding plate 10 passes from the locking position to the unlocking position.
• the pin 18 is positioned away from the pivot axis A1 so as to have a distance to travel or radial displacement sufficient to allow the lifting of the jumper.
• This pin 18 does not intervene in the normal operation of the device 100. Its role is only to facilitate the task of the watchmaker during the assembly / disassembly of the movement. With such a device, in the unlocked position, the jumper 17 is raised, the watchmaker can remove and return the display disc 3 (integral with the star 2a) without hindrance and without additional action on its part, which allows especially not to dirty the top or bottom of the star 2a if the saltire is pre-greased.
• the mechanism in which the device 100 is integrated could comprise one or more other members, for example another jumper, arranged to cooperate with one or more parts of the holding plate 10. using a set of distances to travel specific to the function (s) of said other body (s).
• the holding plate 10 shown in FIGS. 1 to 3 can move in a plane substantially identical to the plane in which it is in the locked position. (possibly slightly above), rotating around the body of the screw 11 (in the direction indicated by the arrow R in Figures 2 and 3).
• the holding plate 10 and the screw 11 could be replaced, respectively by any other holding part and by any other suitable fastening means.
• the drive wheel has a different shape and is rotatably connected to the display disk by other means than the one previously mentioned.
• said drive wheel may typically comprise a wheel integral with a bearing surface on which the display disk would be glued, driven or brazed.
• the drive wheel and the display disk can also be rotatably secured by any other suitable means.
• the display disc of the device according to the invention may be different from a disc of days, it may, for example, typically be a moon disk, a disk indicating the date of the days, the current month, the day and the night, the hours, minutes or seconds (for a trailing or jumping indication), the zodiac signs or any other indication of a calendar of any crop, the reserve of walk, leap years, or any other display disc.
• the drive wheel carrying the display disk and driving it in rotation typically comprises a toothed wheel, but it can also be another type of driving element, for example a toothed wheel which can be adapted to be rotated. driven in rotation by friction.
• the holding part may take other forms than those illustrated in the figures. It can typically take any form allowing it to perform its function.
• the holding part could be held in position by any suitable means other than a screw, for example by clamping or pinching against a part, including against a part belonging to the frame.
• the expression display disc is obviously not limited to a circular disk.
• the axis of rotation of the drive wheel is substantially perpendicular to the plate and the holding part extends in a plane substantially parallel to the plate. It is however very conceivable that the axis of rotation of the drive wheel is inclined relative to the plate and that the holding part extends in a plane not parallel to the plate.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Electromechanical Clocks (AREA)

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Applications Claiming Priority (2)

Publications (1)

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ID=60421656

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Citations (6)

Family Cites Families (1)

• 2018
  • 2018-11-21 EP EP18812307.9A patent/EP3714336B1/de active Active
  • 2018-11-21 WO PCT/IB2018/059181 patent/WO2019102374A1/fr active Search and Examination

Patent Citations (6)

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