Sewing Machine Clamping Device with Adjustable Arms
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Solution Overview
Problem
Existing clamping devices for sewing machines are awkward to load, adjust, and unload, and fail to securely hold materials of varying sizes and thicknesses, leading to unacceptable stitching or embroidering patterns.
Innovation Solution
A clamping device with vertically and horizontally adjustable arms, featuring flexible blades and a cam-activated lever system that securely engages and tightens materials, allowing for easy installation and removal of different materials without horizontal arm movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior hooping devices are used to hold fabric taut, then stitching quality is improved, but the devices are awkward to load, adjust and unload
Solution Approach 1:
The clamping device employs movable arms that can be raised and lowered vertically to open and close on the fabric. The arms move dynamically from an open position for easy loading to a closed clamped position for stitching, and back to open for unloading. This dynamic movement resolves the contradiction by making the device easy to operate while maintaining stitching quality.
Solution Approach 2:
The clamping device is divided into separate movable arm sections that can independently open and close. Each arm has a movable section that can be raised to open the clamp and lowered to close it. This segmentation allows the operator to easily load and unload fabric by simply lifting the arms vertically, without having to manipulate complex adjustment mechanisms.
2Manufacturing precision
If prior hooping devices are used to hold fabric, then stitching quality is improved, but adjustment and unloading are difficult
Solution Approach 1:
The device uses simple vertical movement of arms rather than complex horizontal adjustments. The arms raise and lower along vertical paths defined by guide slots, eliminating the need for complex adjustment mechanisms. This reduces device complexity while maintaining the ability to hold fabric taut for quality stitching.
Solution Approach 2:
The guide slots in the mounting plate automatically guide the arms along their vertical movement paths. The arms self-align within the slots during movement, eliminating the need for manual alignment or complex adjustment mechanisms. This self-guiding feature reduces device complexity while ensuring proper positioning for stitching.
3Manufacturing precision
If fixed clamping devices are used, then stitching quality is improved, but they cannot accommodate various materials of different sizes and thicknesses
Solution Approach 1:
The clamping device is designed to accommodate various materials of different sizes and thicknesses through its adjustable arm configuration. The arms can be positioned at different vertical levels and the movable sections can open wide to accommodate thick or large materials. This universal design maintains stitching quality across diverse material types while providing adaptability.
Solution Approach 2:
The arms can dynamically adjust their vertical position and opening width to accommodate different material sizes and thicknesses. The movable arm sections can be raised higher for thicker materials and the arms can be positioned at different horizontal locations along the mounting plate. This dynamic adjustability provides versatility while maintaining consistent clamping force for quality stitching.
4Measurement precision
If manual adjustment of arms is required, then positioning precision is improved, but operation time increases
Solution Approach 1:
The arms move dynamically along predefined vertical guide slots rather than requiring manual positioning adjustments. The guide slots constrain the arms to precise vertical paths, automatically providing positioning precision. The arms can be quickly raised and lowered without manual adjustment, reducing operation time while maintaining positioning accuracy.
Solution Approach 2:
The guide slots automatically guide and position the arms along their movement paths. The arms self-align within the slots during vertical movement, eliminating the need for manual positioning adjustments. This self-positioning feature reduces operation time while maintaining the precision needed for quality stitching.
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 device ensures efficient and quality embroidery by maintaining materials in a fixed position, accommodating various materials and sizes, and simplifying the process for both skilled and unskilled operators, reducing reprocessing and waste.
Implementation Method 1
a finger lever affixed to a cam raises and lowers the movable arm section to release or clamp selected material therebetween
Implementation Method 2
each with a flexible blade to securely engage the material to prevent movement in one horizontal direction, yet which tightens the material in the opposite horizontal direction
Data Source
AI summary
A clamping device and method for a conventional sewing or embroidery machine has a pair of movable arms. Each of the arms includes a fixed section and a movable section for receiving material or item to be embroidered therebetween. A manual lever allows the movable arm to be raised for insertion of the material and a scale on the arm allows the depth of insertion to be easily determined for accurate insertion. Each arm is movable along a slotted mounting plate affixed to the sewing machine proximate the sewing head. The clamping device provides uniform, taut material for accurate, smooth embroidering.