Needle-Synchronized Sewing Holder Control for Buttonhole Seams
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Solution Overview
Problem
Existing sewing machines face challenges in improving the quality of seams, particularly when sewing buttonholes, due to the interaction between the sewing needle and the frame movement.
Innovation Solution
A sewing machine external unit equipped with a holder, driver, position detector, and controller that detects the sewing needle's position and controls the holder's movement to synchronize with the needle's vertical and horizontal movements, preventing interference and enhancing seam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frame, ratchet mechanism, and top are used to move the frame in the shape of buttonholes, then the sewing machine can sew buttonholes, but the interaction between the sewing needle and frame movement reduces seam quality
Solution Approach 1:
The patent replaces the mechanical ratchet mechanism with an electromagnetic actuator that directly drives the holder along the bed. This substitution eliminates the complex mechanical interactions between the needle and frame movement, allowing for precise control of holder position and movement timing, thereby improving seam quality while maintaining buttonhole sewing capability
Solution Approach 2:
The patent implements dynamic control where the holder's movement is synchronized with the needle's position through a controller that receives position feedback. The holder moves only when the needle is in appropriate positions, creating a dynamic coordination between needle and holder that prevents interference and improves seam quality during buttonhole sewing
2Adaptability or versatility
If the holder is moved along the bed during sewing, then various seam shapes and patterns can be achieved, but interference between needle and holder movement may occur
Solution Approach 1:
The patent employs a position detector that continuously monitors the needle's position and feeds this information back to the controller. The controller uses this feedback to determine the appropriate timing for holder movement, ensuring the holder only moves when the needle is in safe positions. This feedback mechanism prevents interference while enabling various seam shapes and patterns
Solution Approach 2:
The controller plans and coordinates holder movement in advance based on the desired seam pattern, ensuring movements are timed to occur only when the needle is in appropriate positions. This preliminary coordination prevents interference before it can occur, allowing reliable creation of various seam shapes and patterns
Data Source
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AI summary
The disclosure improves the quality of seams in sewing using a sewing machine, and includes: a holder (11) holding fabric (S); a driver (12) being detachable from a bed (7) of a sewing machine (1) and driving the holder along an upper surface (7a) of the bed; a position detector (13) detecting a position of a sewing needle (3) of the sewing machine in an up-down direction; and a controller (16) controlling driving of the holder, which is performed by the driver, based on a detection result of the position detector.