Thread loosing device for sewing machine

Thread loosing device for sewing machine

  • CN 1,109,148 C
  • Filed: 04/07/1999
  • Issued: 05/21/2003
  • Est. Priority Date: 04/07/1998
  • Status: Active Grant
First Claim
Patent Images

1. the thread-loosening device of a Sewing machines, wherein Sewing machines has the presser bar of following end bearing cloth presser feet, be connected the depression bar that presser bar is moved up and down with presser bar and move up and down device, move up and down device when presser bar is risen at depression bar, remove the tension relieving device of reaching the standard grade of the tension force that produces reaching the standard grade, it is characterized in that also having switching device shifter, this switching device shifter moves up and down device when presser bar is risen at depression bar, make the tension relieving device of reaching the standard grade remove line tension effectively, or invalid to last line tension releasing.

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