The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2021
Filed:
Feb. 28, 2017
Pfaff Industriesysteme Und Maschinen Gmbh, Kaiserslautern, DE;
Frank Koschnick, Lorsch, DE;
Berthold Becker, Rimbach, DE;
PFAFF Industriesysteme und Maschinen GmbH, Kaiserslautern, DE;
Abstract
A material web fixing device is used as part of a filter bag manufacturing installation. A material web transport device is used to transport at least two material webs, which fixed together at a distance from one another by at least one fixing seam, along a transport direction. A plurality of sewing units each have stitch forming tools configured as a sewing needle and a looper which interact with a thread. The material webs can be passed through between said stitch forming tools in the transport direction. An excess thread production unit is used to lengthen a thread path between the material webs. The excess thread production unit is arranged between the material webs in the thread run during operation. As a result, a material web fixing device is obtained, which allows filter bags to be produced with larger bag openings, particularly with larger opening extensions between the material webs.