Sewing – Elements – Tensioning
Patent
1977-09-21
1980-09-09
Krizmanich, George H.
Sewing
Elements
Tensioning
D05B 4700
Patent
active
042211808
ABSTRACT:
A modular upper thread tension device utilizing an end of a tension beam to press together at least a pair of opposed thread engaging discs, and a raised helix form track on an end cam to provide a variable pivot point for the beam, all the components of the tension device being arranged to provide a compact form of construction. The entire tension assembly is supported on a sheet metal bracket which is attachable to the sewing machine frame with the thread engaging discs thereof lying beneath a slot in a top cover. A bell crank is fulcrummed on a pin attached to the support bracket, and has one leg thereof pivotably attached to a first end of the tension beam, which is arranged to lie as an extension to that leg. A mandrel is supported, by lugs of the support bracket, parallel to the tension beam, and has one end thereof extending through the second leg of the bell crank. A compression spring supported on the mandrel bears against the second leg of the bell crank, and urges the first leg of the bell crank, and the first end of the tension beam to which it is pivotably connected, towards the mandrel. The raised helix form track on the end cam extends parallel to the tension beam and to the mandrel, and has at all times, a point on the raised helix track in abutment with a raised portion of the tension beam extending along the length thereof.
REFERENCES:
patent: 3190249 (1965-06-01), Gegauf
patent: 3366083 (1968-01-01), Ketterer et al.
patent: 3472190 (1969-10-01), Gegauf
patent: 3557731 (1971-01-01), Casas-Robert
patent: 3667414 (1972-06-01), Illes et al.
patent: 4159005 (1979-06-01), Jimenez et al.
Bell Edward L.
Cohen Moshe I.
Krizmanich George H.
Schmidt Edward P.
Smith Robert E.
LandOfFree
Compact upper thread tension 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 Compact upper thread tension device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact upper thread tension device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2220620