Automatic watch |
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| 申请号 | US43352774 | 申请日 | 1974-01-15 | 公开(公告)号 | US3878673A | 公开(公告)日 | 1975-04-22 |
| 申请人 | BIFORA UHREN; | 发明人 | MEITINGER HEINZ; | ||||
| 摘要 | An automatically rewound watch having a mainspring barrel with exterior teeth in engagement with a control member gear, the control member being a nut axially movable along a threaded shaft which is rotated during rewinding so that the nut moves in a first direction in response to rewinding and in opposite direction in response to unwinding of the barrel, said shaft being axially movable upon the nut engaging a stop member so to disengage a rewinding mechanism coupling. | ||||||
| 权利要求 | 1. In a watch having an automatic rewind mechanism, comprising a mainspring fixed at a mainspring shaft and housed in a mainspring barrel, said mainspring shaft having a toothed blocking gear in operative engagement with a toothed rewind pinion, the latter mounted on a rewind shaft and including a rotor oscillating upon movement of the watch, the oscillatory motion of said rotor being transmitted to said mainspring via said rewind pinion and blocking gear in order to wind said mainspring, the improvement comprising coupling means between said rotor and said rewind pinion which coupling means is automatically disengaged after the mainspring is wound to a predetermined extent in order to prevent overwinding, which coupling means comprises: a. a rewind wheel rotatably journalled about the rewind shaft and disposed above and coaxial with the rewind pinion, said rewind wheel being in engagement with the rotor of the automatic rewind mechanism via reduction gear means; b. means cooperative with the rewind wheel and the rewind shaft whereby rotary motion is imparted to the rewind pinion; c. an interiorly threaded nut engaging threads on the rewind shaft, said nut having exterior teeth in engagement with teeth provided on the circumference of the mainspring barrel, said nut being driven downwardly along the rewind shaft when the rewind pinion is rotated while the barrel is stopped and driven upwardly along the rewind shaft when the barrel is rotated under the bias of the mainspring and the rewind pinion is stopped, said nut being at its uppermost position on the rewInd shaft when the mainspring is unwound and at its lowermost position on the rewind shaft when the mainspring is wound; and d. a stop member at the lowermost position of the nut on the rewind shaft, whereby upon further winding, torque acting upon the rewind shaft drives the nut downwardly against the stop member resulting in axial upward movement of the rewind shaft, thereby disengaging the coupling between the rotor of the automatic rewind mechanism and the rewind pinion. 1. In a watch having an automatic rewind mechanism, comprising a mainspring fixed at a mainspring shaft and housed in a mainspring barrel, said mainspring shaft having a toothed blocking gear in operative engagement with a toothed rewind pinion, the latter mounted on a rewind shaft and including a rotor oscillating upon movement of the watch, the oscillatory motion of said rotor being transmitted to said mainspring via said rewind pinion and blocking gear in order to wind said mainspring, the improvement comprising coupling means between said rotor and said rewind pinion which coupling means is automatically disengaged after the mainspring is wound to a predetermined extent in order to prevent overwinding, which coupling means comprises: a. a rewind wheel rotatably journalled about the rewind shaft and disposed above and coaxial with the rewind pinion, said rewind wheel being in engagement with the rotor of the automatic rewind mechanism via reduction gear means; b. means cooperative with the rewind wheel and the rewind shaft whereby rotary motion is imparted to the rewind pinion; c. an interiorly threaded nut engaging threads on the rewind shaft, said nut having exterior teeth in engagement with teeth provided on the circumference of the mainspring barrel, said nut being driven downwardly along the rewind shaft when the rewind pinion is rotated while the barrel is stopped and driven upwardly along the rewind shaft when the barrel is rotated under the bias of the mainspring and the rewind pinion is stopped, said nut being at its uppermost position on the rewInd shaft when the mainspring is unwound and at its lowermost position on the rewind shaft when the mainspring is wound; and d. a stop member at the lowermost position of the nut on the rewind shaft, whereby upon further winding, torque acting upon the rewind shaft drives the nut downwardly against the stop member resulting in axial upward movement of the rewind shaft, thereby disengaging the coupling between the rotor of the automatic rewind mechanism and the rewind pinion. 2. The improvement of claim 1 whereby the means by which rotary motion is imparted to the rewind pinion comprises a nose formed on the top surface of the rewind wheel and a laterally extending arm mounted on the rewind shaft and disposed above the rewind wheel, said arm engaging said nose whereby the oscillatory motion of the rotor is converted via the reduction gear means to cause rotation of the rewind wheel, the nose of the rewind wheel driving the arm which in turn causes rotation of the rewind pinion. 3. The improvement of claim 1 wherein the nut at its uppermost position on the rewind shaft is just in contact with the rewind pinion. 4. The improvement in claim 1 wherein the ratio of the number of teeth between the blocking gear and the rewind pinion is equal to the ratio of the number of teeth between the mainspring barrel and the nut. 5. The improvement of claim 1 further including a display member for indicating the axial position of the nut on the rewind shaft, the relative position of the nut on the rewind shaft corresponding to the relative bias of the mainspring. 6. The improvement of claim 1 including means for manual operation of the blocking gear in order to wind the mainspring when the coupling between the rotor of the automatic rewind mechanism and the rewind pinion is disengaged. 7. The improvement of claim 6 wherein the thread provided on the rewind shaft terminates a predetermined distance from the stop member, said thread disengaging from said nut upon axial upward movement of the rewind shaft. 8. The improvement of claim 1 further including a spring disposed between the rewind wheel and the rewind pinion, the rewind shaft being axially movable against the bias of said spring. 9. The improvement of claim 8 further including means for preventing upward movement of the rewind wheel when the rewind shaft moves axially upward against the bias of the spring. |
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