Sewing Machine Vibration Dampener with Counterbalance Shafts
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Solution Overview
Problem
Maneuverable sewing machines face challenges in accurately following patterns on fabric due to vibrational feedback, making precise control of the machine difficult.
Innovation Solution
A sewing machine assembly with a vibration dampener system that includes counterbalance shafts and offset weights, which reduce vibration by providing balancing forces during the linear reciprocation of the needle bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If maneuverable sewing machine design is used to allow user movement across fabric, then ease of operation is improved, but vibration is generated that reduces manufacturing precision
Solution Approach 1:
The patent employs counterbalance shafts with offset weights that rotate in opposition to the needle bar's reciprocating motion. These counterweights generate balancing forces that cancel out the vibrations produced by the needle bar's linear reciprocation, thereby reducing overall machine vibration while preserving the maneuverability of the sewing machine.
2Productivity
If needle bar linear reciprocation is implemented for stitching, then productivity is improved, but vibration is generated that reduces manufacturing precision
Solution Approach 1:
The counterbalance shafts with offset weights are synchronized to rotate at the same speed as the needle bar reciprocation. This allows the system to maintain high stitching speeds while the counterweights continuously generate opposing forces that cancel vibrational effects, preserving pattern following accuracy throughout the stitching process.
Solution Approach 2:
The vibration dampener system utilizes periodic counterbalancing forces that are applied in sync with the needle bar's reciprocating cycle. The offset weights on the counterbalance shafts create periodic balancing forces that coincide with each stroke of the needle bar, effectively neutralizing vibrations at their source while maintaining continuous high-speed operation.
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 vibration dampener system effectively reduces the vibration of the sewing machine assembly, enhancing user control and accuracy in following desired patterns on the fabric.
Implementation Method 1
a first counterbalance shaft configured to rotate about a first axis in a first direction, a first offset weight coupled to the first counterbalance shaft for rotation therewith, a second counterbalance shaft configured to rotate about a second axis in a second direction, and a second offset weight coupled to the second counterbalance shaft for rotation therewith. The second direction rotation of the second counter balance shaft may be opposite the first direction of the first counterbalance shaft. The second offset weight may oppose the first offset weight at neutral positions as the needle bar linearly reciprocates relative to the sewing machine frame.
Data Source
AI summary
A sewing machine assembly includes a sewing machine frame, a needle bar, a drive shaft, and a vibration dampener system. The needle bar configured to linearly reciprocate relative to the sewing machine frame along a needle bar axis. The drive shaft is coupled to the needle bar and configured to rotate about a drive axis to drive linear reciprocation of the needle bar along the needle bar axis. The vibration dampener system is coupled to the drive shaft to reduce vibration of the sewing machine assembly caused by linear reciprocation of the needle bar during use of the sewing machine assembly.