Time Zone Correction Mechanism with Locking Lever for Date Accuracy
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Solution Overview
Problem
Existing time zone correction mechanisms in watches can result in incorrect date displays when crossing the international date line due to simultaneous operation of correction actuators.
Innovation Solution
A time zone correction mechanism with a manual control device featuring two counteracting manual corrector actuators that operate on a single correction wheel assembly in opposite directions, utilizing a locking lever mechanism to prevent simultaneous operation and ensure accurate date and time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two separate push buttons are used for correcting time zones in both directions, then the ease of operation is improved, but the reliability deteriorates when crossing the international date line due to possible simultaneous operation
Solution Approach 1:
A locking lever mechanism is introduced as an intermediary between the two manual corrector actuators and the correction wheel assembly. This locking lever prevents simultaneous operation of both actuators by mechanically blocking one actuator when the other is engaged, thereby maintaining reliability while preserving ease of operation through the dual-actuator design
2Device complexity
If two counteracting correctors act on one and the same correction wheel assembly, then the device complexity is reduced, but the reliability worsens due to risk of incorrect date correction when crossing international date line
Solution Approach 1:
The locking lever serves as a mediating mechanism that allows the simplified dual-actuator design to function reliably. It coordinates the operation of both correctors on the single correction wheel assembly by preventing simultaneous engagement, thus maintaining low device complexity while ensuring reliable operation when crossing the international date line
3Productivity
If manual corrector actuators can operate simultaneously in opposite directions, then the productivity of time zone adjustment is improved, but the measurement precision deteriorates leading to incorrect date display
Solution Approach 1:
The locking lever mechanism acts as a mediator that controls the sequential operation of the two manual corrector actuators. It allows rapid adjustment by preventing conflicting simultaneous movements while ensuring precise control over the correction wheel assembly's position, thereby maintaining productivity without sacrificing the precision needed for accurate date display when crossing the international date line
Data Source
AI summary
A timepiece time zone correction mechanism is equipped with a manual control device including two counteracting manual corrector actuators setting in motion a time zone corrector associated therewith including a beak which is configured to bear against a relief of a time zone correction wheel assembly and to cause the assembly to move. The assembly includes a regularly spaced toothing having a first drive level from which a plurality of successive teeth are missing and replaced by a first clearance, and a second drive level parallel to the first drive level, and from which a plurality of successive teeth are missing and replaced by a second clearance. The first clearance and the second clearance are not superimposed with one another. Each time zone corrector cooperates with a single drive level, from among the first drive level and the second drive level, of the time zone correction wheel assembly.