Sewing Machine Feedback for Uniform Stitch Pitch
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Solution Overview
Problem
Existing sewing machines fail to inform users how much a work cloth should be moved to achieve uniform stitch pitches when sewing at a constant speed, making it difficult for operators to maintain consistent stitching.
Innovation Solution
A sewing machine equipped with a detection device for actual movement distance, a target pitch storage device, an agreement degree calculation device, and a notification system using LEDs to indicate the agreement between target and actual stitch pitches, allowing users to adjust their movement accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sewing is performed at constant speed, then sewing operation is simple, but user cannot know how much work cloth should be moved to create uniform pitches
Solution Approach 1:
The patent implements a feedback mechanism by displaying the relationship between sewing speed and work cloth movement distance through speed indication lamps. The system detects actual sewing speed, compares it with reference speeds, and provides visual feedback via illuminated lamps to guide the operator on the appropriate movement distance to achieve uniform pitches.
Solution Approach 2:
The patent introduces an intermediary information display system (speed indication lamps) that mediates between the sewing machine's internal speed detection and the operator's external control actions. The lamps serve as an intermediary visual indicator that translates complex speed-movement relationships into simple, actionable guidance for the operator.
2Manufacturing precision
If sewing speed is varied to create uniform pitches, then uniform stitch lengths are achieved, but user cannot know the relationship between speed and movement distance
Solution Approach 1:
The system provides real-time feedback by detecting actual sewing speed, comparing it with pre-stored reference speeds, and illuminating corresponding speed indication lamps. This feedback loop enables the operator to understand the relationship between sewing speed and required work cloth movement distance, thereby achieving uniform pitches through informed manual control.
Solution Approach 2:
The patent stores reference speeds and corresponding pitch information in advance in the control unit. By pre-preparing this speed-pitch relationship data, the system enables the operator to quickly reference the correct movement distance for any given sewing speed without requiring complex real-time calculations or prior expertise.
3Loss of information
If speed setting apparatus is provided to display set speed, then speed information is available, but user cannot know actual movement distance for uniform pitches
Solution Approach 1:
The patent implements a comparative feedback system that does not merely display the set speed, but actively detects the actual sewing speed, compares it with reference speeds, and provides guidance on the corresponding work cloth movement distance through illuminated lamps. This transforms passive speed display into active pitch control assistance.
Solution Approach 2:
The patent replaces traditional mechanical speed control mechanisms with an electronic detection and display system. Instead of relying on mechanical governors or physical speed-regulating devices, the system uses electronic sensors to detect speed and electronic displays (LED lamps) to provide control guidance, enabling more precise and flexible pitch control.
Data Source
AI summary
A sewing machine that enables a user to perform sewing while moving a piece of work cloth, the sewing machine including: a main shaft that drives a needle bar equipped with a sewing needle, a sewing machine motor that rotary-drives the main shaft, a detection device that detects an actual movement distance of the piece of work cloth, a target pitch storage device that stores a predetermined length as a target pitch, which is a target value of stitch pitches of the piece of work cloth, an agreement degree calculation device that calculates an agreement degree between the target pitch and a stitch pitch in actual sewing that is to be determined based on the actual movement distance of the piece of work cloth which is detected by the detection device; and a notification device that notifies of the agreement degree calculated by the agreement degree calculation device.