Sewing Machine Hook System Noise Reduction via Fan Lever Pivoting
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Solution Overview
Problem
Conventional sewing machines generate high noise due to the impact of the holding web of the coil capsule striking a cam fixed to the housing, which is not effectively mitigated by existing designs.
Innovation Solution
The solution involves pivoting the fan lever immediately before the holding web of the coil capsule hits the stationary cam, allowing it to approach the cam at an extremely low speed, thereby reducing noise development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the holding web of the coil capsule strikes the cam fixed to the housing, then the coil capsule is released in the direction of rotation, but high noise is generated
Solution Approach 1:
The fan lever is pivoted in advance immediately before the holding web strikes the cam, preparing the system to absorb the impact. This preliminary positioning allows the holding web to be stopped at extremely low speed right before hitting the cam, preventing the high-impact noise while maintaining the capsule release function
Solution Approach 2:
The invention implements a cushioning effect by controlling the fan lever's pivoting motion to reduce the holding web's speed before impact. The controlled deceleration acts as a cushion, absorbing the kinetic energy that would otherwise generate noise during the striking event
2Object-generated harmful factors
If the fan lever is pivoted to stop the holding web before it hits the cam, then noise is reduced, but the mechanism complexity increases
Solution Approach 1:
The fan lever is designed to perform a dynamic pivoting motion that changes its position continuously during the gripper's rotation. This dynamic adjustment allows the lever to control the holding web's speed in real-time, reducing impact noise without requiring additional mechanical components
Solution Approach 2:
The invention changes the motion parameters of the fan lever by controlling its pivoting speed and position. By adjusting these parameters, the holding web's impact speed is reduced to extremely low levels, achieving noise reduction while using the existing mechanism's degrees of freedom
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
This approach significantly reduces noise generation during the sewing process while maintaining accurate stitch formation, even at high speeds.
Implementation Method 1
a restoring spring (36) acting on a button (37) of the capsule fan (33)
Implementation Method 2
a control cam (39), formed on an outer circumference of a control disk (38), against which the button (37) rests
Implementation Method 3
a fan lever (32) which can be pivoted about an axis (35) perpendicular to an axis of rotation (13) of the gripper (12)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A hook system for a sewing machine comprises a hook (12) which is equipped with a bobbin case (21) featuring a fan cam (31) and a retaining lug (22). Furthermore, a bobbin case fan (33) is provided, which has a fan lever (32) that can be engaged against the fan cam (31). The bobbin case fan (33) also has a push button (37) that rests against a control cam (39) that is rotationally fixed to the hook (12). The control cam (39) has a maximum (42), a minimum (43), and an intermediate range (46) between them, which maintains an approximately constant distance from the axis (13) of the hook (12). This prevents the retaining lug (22) from striking a stationary cam (23) and thus eliminates noise.