A rotor is mounted on mounting means for rotation in first and second senses. A drive pinion is coaxial to and non-rotatably connected to said rotor. A ratchet wheel is freely rotatably mounted on said rotor. A stepping pawl is mounted on said rotor and arranged to interengage with said ratchet wheel so as to couple to said rotor for rotation in, and only in, said second sense. Idler gear means are rotatably mounted on said mounting means. A reversing gear is radially floatingly mounted on said mounting means and in mesh with said drive pinion and arranged to mesh with said idler gear means to rotate the same in said first sense only during a rotation of said drive pinion in said first sense. Means are provided to transmit motion from said ratchet wheel to said idler gear means to rotate the same in said first sense during a rotation of said rotor in said second sense.
An automatic winding mechanical watch movement wherein a gear meshing with a pinion pivotable in unison with a weight is mounted on a common bridge which mounts in turn an automatic winding gear train and time-keeping gear train in common.
In an electronic watch including a so-called automatic winding dynamo, structures of parts themselves and layout of the parts are improved to achieve a reduction in thickness of the electronic watch. Bearing portions for a rotational shaft (211) of a dynamo rotor (21) are made up of hole jewels (212, 214) and ring-shaped caps (213, 215). The cap (215) covers, from the outer side, one end surface (216) of the hole jewel (214) which locates on the side facing a dynamo rotor (21), and defines a lubricant holding annular slot (G3) between the cap and an outer circumferential surface of the rotational shaft (211). Accordingly, even with the dynamo rotor (21) rotating at a high speed, a lubricant is prevented from scattering to the surroundings from the annular slot (G3). Spacings between adjacent parts can be narrowed and the thickness of the electronic watch can be reduced.
The device includes a barrel (2) inserted in the kinematic chain between the rotor (11) of the generator (1) and the oscillating weight (3). The barrel includes a spiral coiled spring (4) and a sliding strip (6), wound in the same direction as the spiral coiled spring over the length of a turn, without any mechanical connection with the spring, but forming a protective envelope in the open position in case of shock. The shockproof device can be applied to the generator of a wristwatch.
