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
  • G04B15/00—Escapements
• • 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
  • G04B15/00—Escapements
  • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel

Definitions

• the present invention relates to an exhaust device, in particular an exhaust device for a timepiece movement. It also relates to a timepiece movement provided with such a device, as well as a timepiece equipped with a timepiece movement provided with such a device.
• the exhaust device constitutes a centerpiece being responsible on the one hand for delivering the energy necessary for the maintenance of the oscillation movement of the mechanical oscillator , balance and hairspring, and on the other hand to transmit the oscillation frequency of the oscillator to the gear train causing the time display.
• WO 01/77759 describes an improved exhaust relative to the faults of the known exhausts mentioned above.
• a first embodiment described with reference to FIG. 2 comprises a rotary exhaust, relatively easy to manufacture, but remaining sensitive to the galloping phenomenon, that is to say being liable to take time. advances in the event of impacts in one or more directions parallel to the gear plan.
• the same application describes a second embodiment of an escapement opposite FIG. 12, this escapement comprising more than one locking point per cycle becomes impervious to galloping.
• being of oscillating type rather than rotary its construction is more complicated.
• An object of the invention is therefore to provide an improved exhaust relative to known exhausts, that is to say free from the known defects mentioned.
• Another object of the invention is to propose an exhaust which is simple to manufacture and which escapes the galloping phenomenon.
• Another object of the invention is to propose an exhaust that is easy to lubricate.
• Yet another object of the invention is to propose a timepiece movement provided with such an escapement.
• Yet another object of the invention is to provide a timepiece equipped with a timepiece movement provided with such an escapement.
• FIG. 1 represents a general plan view of an exhaust according to the invention
• FIG. 2 schematically represents the different alignment planes of the components of the exhaust.
• FIG. 3 represents a toothed wheel belonging to the escape wheel
• FIG. 4 represents a pulse wheel belonging to the escape wheel
• FIG. 5 represents a pinion belonging to the locking assembly
• FIG. 6 represents a blocking part belonging to the blocking assembly
• FIG. 7 represents a first shaped part belonging to the blocking assembly
• FIG. 8 represents a set of stator and magnet belonging to the assembly for producing a magnetic couple
• FIG. 9 represents a pinion belonging to the assembly for producing a magnetic couple
• FIG. 10 represents a second shaped part belonging to the assembly for producing a magnetic couple
• FIG. 11 represents the plates of the balance spring of the hairspring
• FIG. 12 represents a diagram of the torque transmitted by the exhaust according to the invention.
• Figures 13 to 22 show different stages of an operating cycle of the exhaust according to the invention.
• An embodiment of the assembly of the exhaust according to the invention is shown in plan in Figure 1 and in section along the broken line II-II and showing several planes in elevation in Figure 2.
• the exhaust comprises here: an exhaust shaft 1 on which are mounted a toothed wheel 10 and a pulse wheel 11; a locking shaft 2 on which are mounted: a locking pinion 20, a locking piece 21 and a first shaped part 22; a shaft for producing an electromagnetic couple 3 on which are mounted: a rotor 33 rotating inside a stator 34, a second pinion 30 and a second shaped part 32.
• the figures also show, schematically, a balance plate 44, pivoting around an axis 4 and carrying a pulse lever 41 and a release lever 42 , the other constituent elements of the balance wheel are known and are therefore neither shown nor described more precisely here.
• Figures 3 to 11 individually represent each of the components mentioned above. It is understood that for several of these components, the shapes shown here are only one possible embodiment shown by way of example. In fact, to obtain a determined function, as will be seen below, two or more parts intended to cooperate have their paired forms defined by their function; pairs or groups of pieces of different shapes could be obtained for the same or an equivalent function.
• FIG. 3 in particular shows the toothed wheel 10 with a module of 49 teeth, but comprising 7 gaps of each a tooth, regularly distributed around the perimeter of the wheel. Consequently, the toothed wheel 10 comprises 42 teeth.
• the operation of this wheel and of these pinions and their gaps will be explained below.
• the assembly consisting of the rotor 33 and the stator 34 is located on another plane.
• FIG. 12 shows the torque transmitted by the exhaust shaft to the time display device (not shown) of the clockwork movement as a function of the angle of rotation of the rotor 33, this torque being transmitted directly or via one or several intermediate cogs.
• This couple is made up of a first component formed by a constant torque, coming from the mechanical energy storage device of the clockwork movement, this energy storage device not being shown in the figures and a second component varying periodically, for example sinusoidally as in the example shown, supplied by the rotor 33 and transmitted via the pinions 30 and 20 to the toothed wheel 10 and finally to the shaft 1.
• this pair comprises two stable positions S1 and S2 over a period, these two stable positions corresponding to two blocking points as described below.
• These table positions are defined by a zero crossing of the torque curve, with a negative slope of said curve.
• the opposite points, 11 and 12 each corresponding to a release point as described below are defined by zero crossing points of the torque curve, with a positive slope of said curve.
• FIG. 13 there is a first stage of operation of the exhaust, said exhaust being at the first blocking point S1 of the diagram in FIG. 12.
• the impulse wheel 11, which under the effect of the constant torque applied to axis 1 by the energy storage device tends to rotate counterclockwise is blocked since a tip 110 of said wheel is in abutment against a face
• the balance 44 is pivoting counterclockwise, as shown by the arrow.
• the release lever 42 just strikes a portion 220 of the first shaped part 22 in order to rotate it with the axis 2 clockwise, as seen in Figure 15
• This pivoting movement of the axis 2 firstly causes the locking piece 21 to pivot on which the tooth 110 of the impulse wheel 11 remains pressed and therefore pivots slightly around its axis 1.
• the pivoting drive movement of the axis 1 is done by the sliding of the tip 110 of the impulse wheel 11 along the profile of the locking piece 21 and not by the drive of the wheel 10 by the pinion 20.
• the toothing of the pinion 20 is located just opposite a gap in the toothing of the wheel 10, these two elements therefore being disengaged during this movement.
• FIG. 19 This striking movement unlocks the system which then leaves the blocking point S2 in FIG. 12.
• This situation is shown in FIG. 19 in which we see that the shaped part 32 is pivotally driven by the release lever 42, making pivot the axis 3 and the rotor 33, as well as the shaped part 22, the portion 221 of which slides along the periphery of the bearing surface 321, causing the axis 2 to pivot.
• this pivoting of the axis 2 is not controlled by the teeth of the pinions 20 and 30 since the teeth of the pinion 20 are opposite a gap in the teeth of the pinion 30.
• the pinion 20 meshing with the toothed wheel 10 of the axis 1 allows the latter to pivot.
• the device described above having two stable blocking positions S1 and S2 per cycle, separated by an unlocking position 11, a mechanical shock imposed on the timepiece capable of causing the balance spring to perform more than one revolution, respectively capable of controlling two or more of two successive releases in a conventional escapement, cannot generate a galloping phenomenon, respectively cannot cause an unwanted advance of the time display of the device according to the invention, since in this case the phase of unlocking would not have taken place.
• Such an escapement device is perfectly suited to be integrated into a timepiece movement of a timepiece, in particular a wristwatch.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Transmission Devices (AREA)
• Electric Clocks (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=30005591

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (2)

Family Cites Families (4)

• 2003
  • 2003-07-07 DE DE60307471T patent/DE60307471D1/de not_active Expired - Lifetime
  • 2003-07-07 AU AU2003238329A patent/AU2003238329A1/en not_active Abandoned
  • 2003-07-07 WO PCT/CH2003/000450 patent/WO2004008258A2/fr active IP Right Grant
  • 2003-07-07 EP EP03732164A patent/EP1522001B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events