Sewing Machine Lid Speed Control via Torsion Spring and Damper
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Solution Overview
Problem
Existing sewing machines require a large amount of force to close the lid member, leading to excessive momentum and noise due to the sudden impact against the frame, which affects operability and user experience.
Innovation Solution
A sewing machine with a control portion that regulates the movement speed of the lid member based on its aperture, using a torsion spring and damper mechanism to adjust the speed during opening and closing, ensuring smooth operation and reducing the force required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring portion is used to urge the lid member in the opening direction, then the lid member can be easily opened, but a large amount of force is required to close the lid member
Solution Approach 1:
The spring portion acts as a counterweight mechanism that provides an urging force in the opening direction, balancing the weight and friction of the lid member. This makes opening easier by compensating for the resistance forces, while the closing operation requires overcoming this pre-applied spring force.
Solution Approach 2:
The spring portion performs preliminary action by pre-loading the lid member with an urging force in the opening direction before the user operates the lid. This preliminary force application reduces the effort needed to initiate opening motion.
2Ease of operation
If the lid member is urged to open with a spring portion, then opening is facilitated, but the lid member impacts against the frame portion with excessive momentum when closing
Solution Approach 1:
The damper portion provides beforehand cushioning by being positioned to absorb and dissipate the kinetic energy of the lid member before it impacts the frame portion. This preliminary cushioning action prevents excessive impact and reduces noise during the closing operation.
Solution Approach 2:
The damper portion converts the harmful impact energy and momentum of the closing lid member into beneficial dissipative forces through damping. The kinetic energy that would cause noise and impact damage is transformed into heat and controlled deceleration, turning a harmful effect into a protective function.
3Object-generated harmful factors
If a damper portion is added to control the closing speed, then impact and noise are reduced, but the device complexity increases
Solution Approach 1:
The damper portion acts as an intermediary element between the lid member and the frame portion. It mediates the interaction by providing controlled resistance to the closing motion, smoothing out the energy transfer and preventing direct impact while adding only one additional component to the system.
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 enhances operability by reducing the force needed to open and close the lid member, minimizing noise and impact, thereby improving the overall user experience and maintaining a high-quality impression.
Implementation Method 1
using a torsion spring and damper mechanism to adjust the speed during opening and closing
Implementation Method 2
using a torsion spring and damper mechanism to adjust the speed during opening and closing
Data Source
AI summary
A sewing machine includes a frame portion, a lid member, and a control portion. The lid member is attached to the frame portion such that the lid member can open and close. The control portion is configured to control a movement speed of the lid member depending on an aperture of the lid member.