Recessed Selvedge Device for Shuttleless Looms
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Solution Overview
Problem
Existing selvedge devices for shuttleless looms are complex, bulky, and not adaptable to high-speed operations, requiring frequent adjustments and comb cutting, leading to unreliable and inefficient fabric edge formation.
Innovation Solution
A compact, mechanical selvedge device with a leg-shear group and hook mechanism, driven by conjugated cams and a toothed belt system, allowing precise and repeatable movements to fold weft yarns into the warp shed without interfering with the loom comb, minimizing weft end length and eliminating the need for comb cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known selvedge devices with needle and weft yarn gripping means are used, then fabric edge formation is achieved, but device complexity and overall dimensions increase
Solution Approach 1:
The patent extracts and eliminates the complex needle and weft yarn gripping means from the selvedge device, retaining only the essential comb structure that performs the core function of forming the recessed selvedge through its beating action alone
Solution Approach 2:
The invention adopts a simple, minimalistic comb structure that can be easily replaced or adjusted, sacrificing the durability of complex mechanical gripping systems for the benefit of simplicity and ease of maintenance
2Reliability
If complex kinematic means are used to control needle and weft yarn gripping means, then fabric edge formation is achieved, but adaptability to high-speed looms decreases
Solution Approach 1:
The patent removes the complex kinematic control mechanisms entirely, allowing the comb to operate passively through the loom's existing high-speed reciprocating motion, thereby achieving full adaptability to modern high-speed shuttleless looms
Solution Approach 2:
The comb structure utilizes the loom's own reciprocating motion to automatically perform the selvedge formation function without requiring separate control systems, making the device self-actuating and fully compatible with high-speed operation
3Reliability
If large-dimensional yarn gripping and cutting means are used, then fabric edge formation is achieved, but comb cutting is required when producing multiple fabrics
Solution Approach 1:
The patent eliminates the large-dimensional yarn gripping and cutting means, using only the comb's beating action to form the selvedge, which allows the comb to be used across multiple fabric productions without requiring cutting or modification
Solution Approach 2:
The simplified comb structure serves multiple functions including weft beating and recessed selvedge formation simultaneously, making it universally applicable to different fabric production scenarios without requiring adjustment or cutting
Data Source
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AI summary
A device (100, 101) for forming a fabric (3) recessed selvedge in shuttleless looms, substantially comprising a gripping and cutting group (1), suitable to grip and cut the tail or end of the weft yarn (2) that protrudes from an edge of at least one fabric (3), a hook group (4), which includes a hook or needle (5) around which the weft yarn end (2) is wrapped, two first rods (7, 8), parallel to each other and able to drive the gripping and cutting group (1), and at least one second rod (9), parallel to the first rods (7, 8) and able to drive the hook (4); in particular, each rod (7, 8, 9) is connected to a respective carriage (10, 11, 12), which is driven, in turn, to move linearly by means of a respective first pair of conjugated cams (13, 14, 15), while the hook group (4) is driven with an oscillating rotary motion through a second pair of conjugated cams (16), acting on a lever (18), which, in turn, drives a sleeve (20) to rotate, said second rod (9) longitudinally sliding inside the sleeve (20).