Position detection and correction mechanism for a timepiece

• US 5,231,612 A
• Filed: 08/31/1992
• Issued: 07/27/1993
• Est. Priority Date: 08/29/1991
• Status: Expired due to Fees

• Current Assignee: Junghans Uhren GmbH
• Original Assignee: Junghans Uhren GmbH
• Inventors: Allgaier, Jurgen, Ganter, Wolfgang, Maurer, Roland
• Primary Examiner(s): Miska, Vit W.
• Application Number:
  US07/937,372
• Time in Patent Office: 330 Days
• Field of Search: 368/46-47, 368/69-70, 368/185, 368/187, 368/250, 368/256
• US Class Current: 368/47
• CPC Class Codes: G04C 3/14 incorporating a stepping motor G04C3/02 - G04C3/12 take precedence generating timing pulses G04F5/00, G04G3/00; setting G04G5/00; synchronisation G04G7/00; generating commutating pulses in masterclocks G04C13/0463, G04C13/02; slave clocks actuated intermittently by electromechanical step advancing mechanisms G04C13/10; control circuits for stepping motors in general H02P8/00

Abstract

A radio-controlled timepiece contains a mechanism for the detection and correction of a hands setting. The mechanism includes a sender and a receiver for sending and receiving, respectively, a radiation beam. A hands setting mechanism includes an hour wheel, a minute wheel, and a seconds wheel, each possessing an aperture therethrough. The hour wheel has a front mirror located proximate the beam sender for reflecting a beam to the receiver. The front mirror has an interruption defined by the aperture of the hour disk in order to pass the beam through that aperture to a rear mirror disposed remote from the sender, such that a beam reflects from the rear mirror only after passing through aligned apertures in the disks. The hour wheel is movable independently of the minute wheel and seconds wheel, and the minute wheel and seconds wheel are rotatably interconnected.

Claims

1. In a timepiece having minute and hour hands;

a hand-setting mechanism including an hour wheel; and

a correcting means for the detection and correction of a hands setting;

said correcting means including;

a sender and receiver for sending and receiving, respectively, a radiation beam, apertured disks joined for rotation with said hands setting mechanism, one of said disks having a front mirror located proximate said beam sender for reflecting a beam to said receiver, an aperture of said one disk defining an interruption in said front mirror for passing the beam through that aperture, a rear mirror disposed remote from said sender such that a beam reflects from said rear mirror only after passing through apertures in said disks, the improvement wherein said one disk on which said front mirror is formed comprises an hour disk joined for rotation with said hour wheel, said hour disk being movable independently of the remaining disks, said remaining disks being rotatably interconnected.

2. Apparatus according to claim 1, wherein said remaining disks include a minute disk joined for rotation with a minute wheel, a seconds disk joined for rotation with a seconds wheel, a rear wheel, and an intermediate disk;

said minute disk, said seconds disk, and said intermediate disk all being situated between said hour disk and rear disk with reference to the travel of a beam from said sender.

3. Apparatus according to claim 2, wherein said rear disk has an aperture, said rear mirror being disposed behind said rear disk.

4. Apparatus according to claim 3, wherein said rear disk has an additional aperture located diametrically opposite the first-named aperture.

5. Apparatus according to claim 2, wherein said rear mirror is formed on a surface of said rear disk which faces said sender.

6. Apparatus according to claim 2 including a motor connected to drive said intermediate disk;

said seconds wheel being driven by said intermediate disk;

said rear disk being driven by said seconds wheel;

said minute wheel being driven by said rear disk;

said hour wheel, said seconds wheel and said minute wheel all being rotatable about a common axis.

7. Apparatus according to claim 1 comprising a first bipolar step motor connected to drive said hour wheel, and a second bipolar step motor connected to drive said remaining disks.

8. Apparatus according to claim 7, wherein only a single pulse generator is provided, said pulse generator generating an actuating pulse of random polarity for both of said first and second motors.

9. Apparatus according to claim 8, including a reducing gear connected to said first motor and to said hour wheel.

10. Apparatus according to claim 2, wherein said hour, minute and seconds disks are defined by the hour, minute, and seconds wheels, respectively.

11. Apparatus according to claim 2, wherein said hour, minute, and seconds wheels rotate about a common axis, and said rear and intermediate wheels are eccentrically disposed relative to said axis.

12. Apparatus according to claim 1, wherein said timepiece comprises a radio-controlled timepiece having a radio signal receiver operably connected to said hands setting mechanism.