Multi-thread Generating Unit for Filter Pocket Spacing
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Solution Overview
Problem
Existing material web fixing devices in filter bag production plants are limited in producing filter pockets with larger pocket openings, as they struggle to maintain the required spacing between material webs effectively.
Innovation Solution
A multi-thread production unit is integrated between the material webs to generate multiple threads, which are produced in close proximity to the sewing unit, allowing for larger distances between the webs, with adjustable inclined surfaces and displaceable thread generating units to control thread length and orientation, ensuring reliable and adjustable thread paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional material web fixing device is used, then the device structure is simple, but it cannot maintain the required spacing between material webs for larger filter pocket openings
Solution Approach 1:
A multi-thread generating unit is introduced as an intermediary component between the material webs and the sewing unit. This unit generates multiple threads (typically 3-5 threads) that extend between the material webs, acting as mediators to maintain the required spacing. The multi-thread generating unit includes thread generating rollers that create these intermediate thread structures, allowing the material webs to be held at precise distances apart without requiring complex direct positioning mechanisms between the webs themselves.
2Length of moving object
If the multi-thread generating unit is positioned far from the sewing unit, then the thread path is longer, but the device complexity and thread control difficulty increase
Solution Approach 1:
The multi-thread generating unit is merged with the sewing unit into an integrated assembly. The thread generating rollers are positioned in close proximity to the sewing needle and presser foot, with the unit essentially forming part of the sewing mechanism itself. This merging allows the multi-thread generating unit to be positioned immediately adjacent to the stitching location, creating short thread paths while maintaining precise control. The integration eliminates the need for separate, distant thread generation stations, thereby reducing device complexity while achieving the required thread lengths for spacing maintenance.
Data Source
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AI summary
A material web fixing device is used as part of a filter pocket manufacturing system. A material web conveying device is used in the process to convey at least two material webs (3, 4), which are to be fixed together at a distance to each other by means of at least one fixing seam (19), along a conveying direction (6). A plurality of sewing units (7) have a respective sewing needle (8) and a thread gripper (9) as stitching tools which interact with a thread (10). The material webs (3, 4) can be conveyed between said stitching tools in the conveying direction (6). A multithread generating unit (14) is used to lengthen a thread path between the material webs (3, 4). The multithread generating unit (14) is arranged between the material webs (3, 4) in the thread course during operation. As a result, a material web fixing device is produced by means of which filter pockets can be produced with larger pocket openings, particularly with larger opening extensions between the material webs.