Sewing Machine Free Motion Stitch Uniformity
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Solution Overview
Problem
Existing sewing machines struggle to enable uniform stitch pitches during free motion sewing, particularly for beginners, as they require manual control of the work cloth, leading to inconsistent results and the inability to reproduce skilled sewing techniques without a movable frame or precise pedal control.
Innovation Solution
A sewing machine equipped with a detecting device, movement calculating device, and cloth feed mechanism that records and reproduces two-dimensional coordinate data for the work cloth's movement, allowing for uniform stitch pitches and enabling users to practice and reproduce sewing patterns without manual control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If free motion sewing is performed by manually moving the work cloth, then the user can perform sewing without a movable frame, but the stitch pitches become non-uniform and the appearance is impaired
Solution Approach 1:
The patent records the movement data of the work cloth during skilled free motion sewing and reproduces it automatically. The recording device captures the precise movement trajectory and speed, which is then replayed to guide the work cloth movement, copying the skilled operator's technique to achieve uniform stitch pitches without manual control variations
Solution Approach 2:
The patent replaces manual mechanical control of work cloth movement with an automated system. The recording and reproduction mechanism substitutes the human operator's hand movements with an automated drive mechanism that precisely controls work cloth movement based on recorded data, eliminating manual control inconsistencies
2Reliability
If a movable frame with tablet and cursor is used to detect positional information, then sewing can be reproduced, but the apparatus cannot be used in free motion sewing without a movable frame
Solution Approach 1:
The patent creates a recording device that can detect work cloth movement in various sewing modes without requiring a specialized movable frame. The system uses a sensor that can detect work cloth position and movement in both free motion and guided motion sewing, making the apparatus versatile across different sewing techniques while maintaining reproduction accuracy
3Ease of operation
If pedal stepping quantity is recorded for playback, then user convenience is improved, but beautiful sewing results cannot be obtained
Solution Approach 1:
The patent records not just the pedal stepping quantity but the actual work cloth movement data including position, speed, and trajectory. By copying the complete movement profile rather than just pedal input, the system reproduces the actual sewing path and stitch characteristics that create beautiful sewing results, going beyond simple pedal playback
Data Source
AI summary
A sewing machine for a user to perform sewing while moving a work cloth includes: a detecting device that detects the work cloth; a movement calculating device that calculates, by two-dimensional coordinate data, a movement direction and a movement quantity of the work cloth between previous detection and current detection of the work cloth when the work cloth is detected; a movement data storage device that stores movement data serving as two-dimensional coordinate data indicative of the movement direction and the movement quantity; a movement data creating device that detects the work cloth on a one by one needle basis of sewing, calculates the movement data, and stores the calculated data in the movement data storage device; a cloth feed mechanism that moves the work cloth; and a reproduction sewing control device that performs sewing while moving the work cloth based on the movement data stored in the movement data storage device.