Lock stitching sewing machine with a thread tightening device

Details Lock stitching sewing machine with a thread tightening device Lock stitching sewing machine with a thread tightening device

1980-06-12

1982-07-20

Nerbun, Peter P.

Sewing

Stitch forming

Shuttle type

112254, 112314, 112158A, D05B 5708

Patent

active

043400035

ABSTRACT:
A thread tightening device for a sewing machine of the type having a main shaft, a vertically reciprocable needle bar with a needle carrying an upper thread, a loop taker and a drive shaft for driving the loop taker and a feed dog, the thread tightening device includes a group of pattern cams operatively connected to the main shaft, pattern selecting device and an arrangement for controlling the vertical movement of the feed dog. This arrangement comprises a control cam and a rotatable shaft, the control cam being slidably axially mounted on the rotatable shaft but not turnable with respect to the shaft. The thread tightening device also includes an element arranged for vertical reciprocating movement in a timed relation with the feed dog, which element engages a lower thread during the stitching operation of the sewing machine. A thread tension adjusting device is provided in the machine which comprises an adjusting cam operatively connected to the pattern cams and a linkage arrangement which is operatively connected to the adjusting cam and to the control cam to displace the control cam in the axial direction in response to a set position of the adjusting cam to thereby adjusting lower thread tension in accordance with the respective pattern cam.

REFERENCES:
patent: 4196682 (1980-04-01), Hanyu
patent: 4295434 (1981-10-01), Hsiao

Affiliated with

Also associated with

Rating

Lock stitching sewing machine with a thread tightening device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lock stitching sewing machine with a thread tightening device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lock stitching sewing machine with a thread tightening device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-245566