Oscillating Sewing Arm and Bushing Layout for Tubular Articles
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Solution Overview
Problem
Existing sewing machines face limitations in creating seams on articles with complex shapes due to the interference of the profiled arm, particularly for tubular-shaped articles that exceed the arm's extension, and lack flexibility in spatial positioning.
Innovation Solution
The sewing machine incorporates a profiled arm with a motorized oscillation system, allowing for a wide range of spatial positions and a horizontal support mechanism that maintains the sewing operation's stability and consistency, enabling the formation of knotted or chained stitches on various article shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the profiled arm is used to support the bushing and rotary hook, then the machine can perform sewing operations, but the arm interferes with tubular-shaped articles that exceed its extension
Solution Approach 1:
The profiled arm is divided into two functional segments: a first portion that oscillates to position the bushing, and a second portion that remains stationary to support the plate. This segmentation allows the oscillating portion to clear tubular articles while the stationary portion maintains sewing stability, eliminating interference with complex-shaped articles.
2Ease of operation
If the bushing is fixed to the oscillating arm, then the sewing mechanism can operate, but the bushing position changes with arm oscillation
Solution Approach 1:
The bushing is extracted from the oscillating portion of the arm and repositioned on the stationary second portion. This extraction decouples the bushing from arm oscillation, maintaining stable spatial positioning while preserving the operational flexibility provided by the oscillating first portion for accessing different article positions.
3Stability of the object's composition
If a stationary support structure is used, then stability is maintained, but flexibility in spatial positioning is limited
Solution Approach 1:
The support structure is made dynamic through the oscillating first portion of the profiled arm, which can move to access different spatial positions and article configurations. The stationary second portion provides stability for the sewing operation. This dynamic-stationary combination achieves both spatial flexibility and operational stability simultaneously.
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A sewing machine for sewing articles, comprising: a turret (3), constrained to a base (2), which bears a sewing needle (4), facing downwards, with the relative sewing yarn (5); first activating means, arranged in the turret, for movement of the needle; a profiled arm (8) supported, in an oscillating way, by a unit (10) borne by the base and rotatably supporting a bushing (11) located beneath the needle and open towards the needle, with the axis of the bushing being coaxial to the axis of oscillation of the arm; stabilising means (12), associated to the arm (8) destined, with the oscillation in one direction of the arm, to impress an oscillation in the opposite direction, and of equal amplitude, on the bushing (11); a rotary hook (13), located in the bushing (11); second activating means (14), acting in phase with the first activating means to draw the rotary hook in rotation for formation in the bushing, and in cooperation with the needle, with the relative sewing yarn (5), of a sewing stitch; means for connecting the unit (10) to the base (2) to enable the oscillation of the unit according to coaxial arcs of circumference the axis (C) of which intercepts the topmost point (T) reached by the end (53) of the rotary hook (13) during the course of the rotation thereof.