Sewing Machine Presser Foot Fabric Guide with Sliding Clamp
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Solution Overview
Problem
Existing presser devices for edge stitching on sewing machines face issues such as rattling during adjustment, cumbersome adjustment mechanisms, loss of guide rulers, insecure positioning, and difficulty in setting precise seam allowances due to inadequate locking mechanisms.
Innovation Solution
A presser device with a fabric guide that includes a slidable and adjustable fabric guide body, a guide pin, and a guide pin pressing plate with a pivoting mechanism that maintains the guide body's position using a lever and gauge system, allowing for precise adjustment and secure fixation without additional fixing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an adjustment screw mechanism is used to transverse move the gauge bar, then the seam allowance width can be adjusted, but rattling occurs and adjustment becomes arduous for large degrees
Solution Approach 1:
The gauge bar is designed to be movable along the guide bar through a slot, allowing dynamic adjustment of seam allowance width. The operator can easily slide the gauge bar to the desired position and secure it with a clamp, eliminating the need for complex screw mechanisms and reducing adjustment effort while maintaining position stability.
2Reliability
If a screw mechanism is used to fix the guide ruler to the guide bar, then the guide ruler can be secured, but the screw needs to be retightened each time position changes making positioning bothersome
Solution Approach 1:
The clamp is designed to allow the gauge bar to be easily clamped to the guide bar at any position along the slot. The operator can quickly adjust the clamp position and tighten it secures the gauge bar, enabling rapid repositioning without complex screw mechanisms while maintaining reliable fixation.
3Ease of operation
If the fabric guide ruler is mounted in a through hole that elastically deforms under load, then no presser screw is needed, but the ruler unexpectedly moves when no load is applied
Solution Approach 1:
The gauge bar moves along the guide bar within a slot and is secured by a clamp that can be tightened at any position. This provides stable positioning whether or not fabric load is applied, eliminating the unexpected movement issue while maintaining easy adjustment capability.
4Ease of operation
If the edge guide is positioned by engaging a lock unit with grooves at predetermined pitches, then positioning is simplified, but the lock unit cannot be set between pitches preventing subtle position setting
Solution Approach 1:
The gauge bar can be positioned at any location along the guide bar within the slot, providing continuous adjustment capability rather than discrete pitch-based positioning. This enables precise seam allowance setting while maintaining ease of operation through simple sliding and clamping.
Data Source
AI summary
A presser device with a fabric guide including a presser foot mounted on a presser bar of a sewing machine; a fabric guide body provided parallel to the presser foot, a position of the fabric guide body being slidable and adjustable; a guide pin provided from a lateral portion of the presser foot in a direction orthogonal to a fabric feeding direction; the fabric guide body guiding an edge of a fabric, the guide pin being inserted through a guide hole of the fabric guide body; a guide pin pressing plate pivotally fitted to the fabric guide body. The guide pin pressing plate having a pushing-up portion that abuts against a needle plate and that exerts a pivoting force about a pivoting point, and a pressing hole through which the guide pin is inserted, the pressing hole applying pressing force to the guide pin.