Pneumatic Tuck-in Device for Weft Thread Selvedge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for tucking the end of a weft thread into a selvedge of a fabric using pneumatic tuck-in devices often require complex synchronization with the reed's movement, disrupting the uninterrupted beating-up process and risking uncontrolled thread movement or loss.
Innovation Solution
The pneumatic tuck-in device moves back and forth along the selvedge in synchronization with the reed, utilizing a blowing device to assist in tucking the weft thread into a subsequent shed while the reed moves away, ensuring secure tucking and allowing for uninterrupted reed operation, with adjustable configurations for various fabric widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pneumatic tuck-in device is located at least partly on the side of the reed before the beat-up line, then the weft thread ends can be blown into a subsequent shed, but the reed's beating-up movement is disrupted
Solution Approach 1:
The tuck-in device is made movable along the selvedge of the fabric in synchronization with the reed's reciprocating motion. The device moves forward when the reed moves forward and moves back when the reed moves back, allowing the reed to maintain its full beating-up speed without obstruction while the tuck-in device remains positioned to blow weft thread ends into the subsequent shed.
2Ease of operation
If the reed is omitted in the region of the pneumatic tuck-in device, then the reed can move along the tuck-in device, but the reed structure becomes complex with interruptions
Solution Approach 1:
Instead of omitting the reed in the region of the tuck-in device, the invention makes the tuck-in device itself movable. The device is mounted on the sley and moves together with the reed in a reciprocating motion, allowing the reed to remain continuous and simple in structure while still enabling the tuck-in function to operate without obstruction.
3Reliability
If the tuck-in device moves back and forth in synchronization with the reed, then the weft thread end is securely tucked, but complex synchronization control is required
Solution Approach 1:
The tuck-in device is mounted on the sley, which is already part of the reed's reciprocating mechanism. By combining the tuck-in device's motion with the sley's existing reciprocating motion, the synchronization is achieved automatically through the mechanical connection, eliminating the need for separate complex synchronization control systems.
4Reliability
If the weft thread is cut while compressed air is directed on the end, then uncontrolled thread movement is prevented, but the cutting timing must be precisely controlled
Solution Approach 1:
The weft thread is cut while the compressed air stream is already directed on the end of the thread and the reed is at a distance from the fabric edge. This preliminary positioning of the thread end by the air stream before cutting ensures that the thread is securely held and directed into the subsequent shed, preventing uncontrolled movement. The cutting is performed at a predetermined position where the air stream has already secured the thread.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables simple and controlled tucking of weft thread ends into subsequent sheds without interrupting the reed's movement, ensuring secure holding until the next weft thread is inserted, and accommodating different fabric widths with adjustable tuck-in devices.
Implementation Method 1
a stream of compressed air is directed on the end of the weft thread
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for tucking an end (23) of a weft thread (19) into a selvedge (27) of a fabric (3) by means of a pneumatic tuck-in device (5) which blows an end (23) of an inserted and beaten up weft thread (19) extending past a selvedge (27) of the fabric (3) into a subsequent shed (1), whereby the tuck-in device (5) is moved back and forth along the selvedge (27) of the fabric (3) in synchronization with the reed (13) and blows in of this end (23) of the beaten-up weft thread (19) into a shed (1) while the tuck-in device (5) moves back and forth along the selvedge of the fabric.