Watch Day Display Apparatus Preventing Date Hopping
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Solution Overview
Problem
Existing day display apparatuses in watches are prone to date hopping due to impacts like drops, as the restraint of the second day display wheel by the jumper is temporarily released, leading to incorrect date display.
Innovation Solution
A day display apparatus with a first day display wheel, a second day display wheel, a jump-and-stop claw portion, and a spring portion, along with a jump-and-stop control mechanism that assumes a rotation restrained state to prevent the jump-and-stop claw portion from coming apart, ensuring the second day display wheel remains stationary unless at a predetermined rotational position, thereby preventing date hopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second day display wheel is allowed to rotate freely when the first day display wheel reaches a predetermined rotational position, then the date can be updated correctly, but the second day display wheel may rotate excessively due to impacts like drops, causing date hopping
Solution Approach 1:
The patent applies dynamics by making the restraint state of the second day display wheel changeable based on the rotational position of the first day display wheel. The jump-and-stop control means transitions between a restrained state (preventing rotation) and a released state (allowing rotation) dynamically, depending on whether the first wheel is at the predetermined position for date update. This resolves the contradiction by allowing rotational freedom only when needed for correct date updating while preventing excessive rotation at other times.
Solution Approach 2:
The patent changes the parameter of rotational constraint on the second day display wheel based on the position parameter of the first day display wheel. When the first wheel reaches the predetermined rotational position, the constraint parameter changes from restrained to released, enabling the second wheel to rotate for date update. At other positions, the constraint parameter returns to restrained, preventing impact-induced date hopping. This parameter-based control resolves the contradiction between reliability and operational freedom.
2Reliability
If the jump-and-stop claw portion is restrained to prevent date hopping, then date display accuracy is maintained, but the mechanism becomes more complex with additional control components
Solution Approach 1:
The jump-and-stop control means serves multiple functions: it restrains the second day display wheel during normal operation to prevent date hopping, and it releases the restraint when the first day display wheel reaches the predetermined position to allow correct date updating. By making this single component perform both restraint and release functions based on positional conditions, the patent avoids adding separate control mechanisms, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The jump-and-stop control means operates autonomously based on the rotational position of the first day display wheel and the engagement state with the day intermediate wheel. It self-regulates between restrained and released states without requiring external control systems, thereby achieving reliable date hopping prevention while maintaining relatively simple mechanism structure. This self-service approach resolves the contradiction by eliminating the need for additional complex control components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the risk of date hopping even under impact conditions, ensuring accurate date display by maintaining the second day display wheel's rotational position.
Implementation Method 1
a spring portion (62), the proximal end (61) of which is supported by the main plate (6) and the distal end (63) of which forms the jump-and-stop claw portion (64)
Data Source
AI summary
The present invention aims to provide a day display apparatus having less risk of occurrence of a day hopping even when an impact caused by a drop or the like is applied and a watch having the same. A day display apparatus of a watch includes a first day display wheel having a program tooth portion, a second day display wheel having a claw wheel portion and a gear portion, a jumper configured to perform a jump-and-stop operation with respect to the claw wheel portion, a day intermediate wheel engaging the gear portion, being rotated by the program tooth portion every time when the first day display wheel reaches a predetermined rotational position, and transmitting the rotation to the second day display wheel, and jump-and-stop control means configured to assume a rotation restrained position in which a jump-and-stop claw portion is restrained from coming apart from between the adjacent claw portions of the claw wheel portion when the jumper is at a rotation restrained state and assume a rotation allowing state in which the jump-and-stop claw portion is allowed to climb over the claw portion of the claw wheel portion every time when the first day display wheel reaches the predetermined rotational position and allows the second day display wheel to rotate.