Free-Hand Embroidery Control via Stepping Motors
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Solution Overview
Problem
Existing methods for free-hand embroidery with sewing machines are challenging due to the difficulty in achieving uniform stitch length, especially when sewing flat seams, as operators must manually control fabric feed speed and direction without adequate assistance, leading to inaccuracies and deviations.
Innovation Solution
A sewing machine system that uses a processor to guide an embroidery hoop in both X and Y directions via stepping motors, allowing operators to control fabric movement using input devices like a computer mouse or joystick, enabling simultaneous and precise stitch execution by calculating and adjusting speed and direction in real-time based on operator input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator manually controls fabric feed speed and direction during free-hand embroidery, then the operator has flexibility in controlling the embroidery process, but the stitch length becomes non-uniform and inaccurate
Solution Approach 1:
The system continuously monitors the actual fabric feed speed and direction through sensors, compares it with the desired feed parameters from the embroidery pattern, and automatically adjusts the fabric feed mechanism to compensate for deviations. This closed-loop feedback control ensures uniform stitch length while preserving operator control flexibility.
Solution Approach 2:
The patent replaces manual mechanical control of fabric feed with an automated control system that uses electronic sensors, microprocessors, and servo mechanisms to precisely regulate fabric movement. This substitution eliminates the imprecision of manual control while maintaining operational flexibility through programmable parameters.
2Manufacturing precision
If the sewing machine automatically feeds the fabric according to stored stitch data, then the stitch length is uniform, but the operator cannot make real-time adjustments to the embroidery process
Solution Approach 1:
The system dynamically switches between automatic feed mode (for uniform stitch length) and manual adjustment mode (for real-time adaptability). The fabric feed mechanism can operate under automated control following stored patterns, while also allowing operator intervention to modify feed speed, direction, or pause the process as needed, making the system adaptable to both precision and flexibility requirements.
Solution Approach 2:
The control system integrates multiple functions: automatic pattern following for precision embroidery, real-time parameter adjustment for adaptability, and hybrid modes combining both. This multi-functional approach allows the same system to deliver uniform stitches while responding to operator needs for real-time modifications.
3Manufacturing precision
If the machine is halted to change embroidery parameters, then the parameters can be accurately set, but the embroidery process loses continuity and productivity decreases
Solution Approach 1:
The system allows operators to pre-program multiple sets of embroidery parameters (stitch type, density, speed, tension) that are stored in memory and automatically activated at predetermined points in the embroidery pattern. This eliminates the need to halt the machine for parameter changes, as all adjustments are prepared in advance and executed automatically, maintaining both precision and continuity.
Solution Approach 2:
The embroidery process continues uninterrupted with the fabric feed and needle operation running continuously. Parameter changes are implemented through pre-programmed automatic adjustments or real-time electronic control modifications that do not require stopping the machine, thereby maintaining process continuity and maximizing productivity while preserving parameter accuracy.
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 method allows for more accurate and uniform stitch length in free-hand embroidery, supporting both straight and flat seams by synchronizing fabric movement with needle movements, enhancing the precision and consistency of free-hand embroidery compared to previous methods.
Implementation Method 1
a processor (C) for guiding an embroidery hoop (20) in X- and Y-directions with the aid of stepping motors
Data Source
AI summary
A method and device for free-hand embroidering on a sewing material with a sewing machine which has a memory for stitch data for a sewing pattern and a processor for reading the stitch data and for causing the sewing machine to execute stitches according to stitch data, which sewing machine has a needle and a sewing material feeder for moving the sewing material in a direction, which processor controls movements according to the direction relative to the position of the needle for the execution of stitches according to the sewing pattern, and which method includes during use of the sewing machine in a free-hand mode: storage in the memory of stitch data for at least one stitch type for free-hand embroidering, choice of a stitch type, maneuvering, via first control signals, a movement of the sewing material feeder in any desired the direction by using a hand-operated control, detection of the first control signals in the processor, calculation in the processor, from the first control signals, of the direction and/or speed of the movement, and control of the sewing material feeder by the processor, via second control signals, for the execution of stitches in the direction and/or at the speed in accordance with stitch data for the chosen stitch type.