The mechanical timepiece movement with power reserve indication comprises at least one barrel system connected to a winding wheel of a differential gear and an unwinding wheel of the differential gear. An intermediate wheel of the differential gear is connected to a cam wheel set to drive it in rotation via a reducing stage. A rack, which acts on a power reserve indicator, is in contact with the cam wheel set. When the power reserve is at zero, a locking part of the rack comes into contact with a locking member to lock the movement at an unwinding output of the barrel system or in contact with the unwinding wheel of the differential gear.

The mechanical timepiece movement with power reserve indication comprises at least one barrel system connected to a winding wheel of a differential gear and an unwinding wheel of the differential gear. An intermediate wheel of the differential gear is connected to a cam wheel set to drive it in rotation via a reducing stage. A rack, which acts on a power reserve indicator, is in contact with the cam wheel set. When the power reserve is at zero, a locking part of the rack comes into contact with a locking member to lock the movement at an unwinding output of the barrel system or in contact with the unwinding wheel of the differential gear.

A timepiece power source is provided, including a barrel containing a mainspring mounted between a drum and an arbor rotating integrally with a ratchet wheel, including a differential gear coaxial to the barrel, with a first input driven by the ratchet wheel, a second input which is the drum, and a pivoting output wheel, coaxial to the arbor, arranged to form or to drive a power reserve indicator, the differential gear including balls driving the output wheel, cooperating with an upper surface of the drum, and with a lower surface, which is opposite thereto, of a differential plate forming the first input, pivoting coaxially on the arbor and connected to the ratchet wheel by a friction means cooperating with a plate, and the ratchet wheel forms the cover of the barrel.

A timepiece including a timepiece mechanism (200) and a display device (100) for displaying a magnitude relating to the timepiece mechanism (200), in combination on wheels (1 2) driven by rotational movements in the same direction of rotation by at least one output (3; 4) of the timepiece mechanism (200), at least one wheel (1; 2) being integral in rotation with an indicator (60) to display a representation of this magnitude by the angular difference between the wheels (1; 2) or between a wheel (1; 2) and a fixed scale, the timepiece mechanism (200) driving, at a given time, a single wheel (1; 2) by a single output (3; 4), the display device (100) driving one of the wheels (1; 2) by another, and the display device and/or the timepiece mechanism can disengage in at least one end-of-travel position of a wheel (1; 2).

The mechanical timepiece movement with power reserve indication comprises at least one barrel system connected to a winding wheel of a differential gear and an unwinding wheel of the differential gear. An intermediate wheel of the differential gear is connected to a cam wheel set to drive it in rotation via a reducing stage. A rack, which acts on a power reserve indicator, is in contact with the cam wheel set. When the power reserve is at zero, a locking part of the rack comes into contact with a locking member to lock the movement at an unwinding output of the barrel system or in contact with the unwinding wheel of the differential gear.

A timepiece includes an hour hand and a minute hand, a dial in which a cutout portion is formed, time scales for indicating the time of day disposed at the dial, a plate member disposed at a back side of the dial, and an auxiliary hand member disposed at a position of the plate member corresponding to the cutout portion of the dial in a plan view. The auxiliary hand member functions as another time scale for indicating the time of day and indicates information other than the time of day. The auxiliary hand member as another time scale is located farther away from the plate member than the time scales.

A barrel for a timepiece. The barrel has a device for limiting the number of running rotations of the barrel, wherein this device still allows any number of winding rotations of the barrel.

A barrel for a timepiece. The barrel has a device for limiting the number of running rotations of the barrel, wherein this device still allows any number of winding rotations of the barrel.

A method for adapting a timepiece movement includes measuring a loss of energy for each free oscillation of the balance at atmospheric pressure; measuring the loss of energy for each free oscillation at a given low pressure corresponding to a working pressure intended for a modified movement; using i) the measured loss of energy at atmospheric pressure and ii) the measured loss of energy at the given low pressure, determining a percentage of energy gain of the balance between respective i) measurements of the measured loss of energy at atmospheric pressure and ii) measurements of the measured loss of energy at the given low pressure; and reducing a torque delivered to the escapement by a value corresponding to the determined percentage of energy gain.

A device for determining a position of a horological display, the device including a control device coordinating a time base, a shape recognition device, and an optical acquisition device. The control device identifies the display and monitors its travel in order to code its instantaneous position in relation to a fixed guide-mark, and controls entries of its position at distinct instants in time to determine its mobility in relation to the fixed guide-mark. The device includes a device for determining the depth position of the display in relation to the fixed guide-mark, a device for controlling the position of the optical acquisition device, a device for controlling a focus of the optical acquisition device, and an additional optical acquisition device coupled with the optical acquisition device to interferentially monitor the display.