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Tension of the bobbin thread is maintained with a bobbin case, a metal enclosure with a leaf spring which keeps the thread taut. The bobbin case has to be free-floating (not attached to an axle) in order to allow the top thread to pass around the bobbin completely and hook the bobbin thread. Bobbins vary in shape and size, depending on the ...
Bobbin holder: The bobbin holder, commonly referred to as just "bobbin", is used to hold the thread bobbin when wrapping thread around the hook. The bobbin holder provides tension so that it can be released when the fly tyer is performing other tasks, such as wrapping hackle.
The threads pass through a tensioning spring and through holes in the middle guide bar (also known as a Swiss bar or fine spool bar). The bobbin threads tie the top and bottom board threads to the pillars. [6] The bobbin threads are carried on brass bobbins held in carriages that are swung back and forth on combs in a pushing and catching routine.
The thread tension mechanisms, one for the upper thread and one for the lower thread, prevent either thread from pulling the entwine point out of the middle of the material. Prior to the invention of the rotating hook, lockstitch machines placed the lower bobbin inside a miniature shuttle which would be passed through the loop formed when the ...
1925 braiding machine in action The smallest braiding machine consists of two horn gears and three bobbins. This produces a flat, 3-strand braid. A braiding machine is a device that interlaces three or more strands of yarn or wire to create a variety of materials, including rope, reinforced hose, covered power cords, and some types of lace.
A vibrating shuttle is a bobbin driver design used in home lockstitch sewing machines during the second half of the 19th century and the first half of the 20th century. It supplanted earlier transverse shuttle designs, but was itself supplanted by rotating shuttle designs.
A short tension band, or brake band, adds drag to the bobbin such that when the spinner loosens their tension on the newly spun yarn, the bobbin and flyer spin relative to each other and the yarn is wound onto the bobbin. A tighter tension band increases relative torque and 'pulls' the yarn onto the bobbin more forcefully; a looser tension band ...
Tension in a sewing machine refers to the pull of the thread between the needle and the bobbin. Sewing machines have tension discs and a tension regulator. If the stitch is too saggy or too tight, the most likely cause is a tension problem.