Abstract:
A minute hand of a timepiece has a central arbor, on which, for driving around the same: a gearwheel is fixed in a first accommodating region, a flyback device is fixed in a second accommodating region, and a snail cam is arranged with an interference fit in a third accommodating region. The snail cam has an opening for accommodating the head of an eccentric and the flyback device has an opening for accommodating the finger of the eccentric, and therefore rotation of the eccentric head, via the flyback device fixed on the central arbor, makes it possible to rotate the snail cam by an angle about the central arbor relative to the gearwheel for setting the triggering point of the advancement operation by the minute control level.
Abstract:
The timepiece movement has an instantaneous actuator controlled by the movement and arranged to actuate a mechanism of the movement by pushing away one element (126) of the mechanism against a return force. The actuator includes a trailing wheel (205) driven by the movement, an eccentric (207) free to rotate coaxially to the trailing wheel and arranged to abut against and therefore be driven by the trailing wheel, a small wheel (219) returned by a spring against the periphery of the eccentric, a pivoting wheel set having a projecting portion (213) free to rotate coaxially to the trailing wheel and arranged to abut against and therefore be driven by the eccentric, the projecting portion (213) of the pivoting wheel set being arranged to push the element (126) of the mechanism away in passing against a return force.
Abstract:
A pinion of a reduction gear intended for use in electronic timepieces having a stepping motor, particularly wrist watches, takes the form of a cylindrical body having an axial blind hole and two teeth milled at one end of the body. The flancs of the teeth are plane parallel surfaces. The distance between the axis of rotation of the pinion and the axis of rotation of a toothed wheel of the reduction gear is slightly less than the radius of the tip-circle of the wheel, so that the two teeth of the pinion block the wheel during the resting period of the motor. If a wheel with 60 teeth is used, it may constitute the fourth wheel in an electronic watch having hands.
Abstract:
A minute hand of a timepiece has a central arbor, on which, for driving around the same: a gearwheel is fixed in a first accommodating region, a flyback device is fixed in a second accommodating region, and a snail cam is arranged with an interference fit in a third accommodating region. The snail cam has an opening for accommodating the head of an eccentric and the flyback device has an opening for accommodating the finger of the eccentric, and therefore rotation of the eccentric head, via the flyback device fixed on the central arbor, makes it possible to rotate the snail cam by an angle about the central arbor relative to the gearwheel for setting the triggering point of the advancement operation by the minute control level.
Abstract:
The timepiece movement comprises an instantaneous actuator controlled by the movement and arranged to actuate a mechanism of the movement by pushing away one element (126) of the mechanism against a return force. The actuator includes a trailing wheel (205) driven by the movement, an eccentric (207) free to rotate coaxially to the trailing wheel and arranged to abut against and therefore be driven by the trailing wheel, a small wheel (219) returned by a spring against the periphery of the eccentric, a pivoting wheel set comprising a projecting portion (213) free to rotate coaxially to the trailing wheel and arranged to abut against and therefore be driven by the eccentric, the projecting portion (213) of the pivoting wheel set being arranged to push said element of a mechanism away in passing against a return force.
Abstract:
A time indicator for a timepiece is driven by an arrangement comprising a driving train and a transmission assembly. The driving train includes a finger adapted to drive a pinion of small diameter and a circular flange adapted to block a pinion of large diameter. The small and large diameter pinions are coaxial, fixed to one another and compose the transmission assembly. In this manner the time interval in passing from one indication to another is diminished while avoiding the butting phenomenon of teeth resting on the circular flange.
Abstract:
A simplified, mechanical analog to digital converter mechanism useful in clocks or the like includes an impulse wheel periodically actuated by the continuous rotation of a conversion wheel coupled to a drive means such as a synchronous motor. The conversion wheel has a single tangential tang struck from its planar surface which functions on each wheel revolution to engage and advance a tooth of the impulse wheel one step. A uniform shaft rotation is thereby converted to a succession of digital steps, for example, a sweep seconds hand is converted to a jump seconds indicator.
Abstract:
A toothed-wheel mechanism for clocks or like small-size precision devices (e.g., stepping mechanisms) comprises a first (driven) toothed wheel having a tooth periphery extending all around the same at least in one plane of the toothed wheel, thereby forming a gear thereof. In another plane thereof, the periphery is formed with gaps flanked by respective teeth, preferably with two or more foreshortened teeth being disposed between successive gaps. A second (driving) toothed wheel is provided with a cylinder segment receivable in the gaps and extending over only part of the periphery thereof of the second wheel while a tooth segment extends over another portion of the periphery of this second wheel for mating engagement with the intergap teeth of the first wheel and of the same intertooth spacing or pitch. The teeth flanking the gap receiving the cylinder segment lie tangent thereto so that the first wheel is immobilized while the cylinder segment of the second wheel is received in a gap of the teeth of the first.