oldtimer Report post Posted June 19, 2011 I have a Juku LU-563, and after reading some of the topics here I´m not certain if I have inserted the bobbin the proper way, so my question is : It I pull the bottom thread (with the bobbin in the machine), which way should the bobbin wind ? Clockwise or counterclockwise ? / Knut Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted June 19, 2011 (edited) The bobbin should feed in the opposite direction as the shuttle is rotating. This will make it harder for it to unwind at high speed, or after sudden stops. So, if your bobbin drive rotates clockwise, insert the bobbin counter-clockwise; against the rotation. Vertical hook machines have snap in bobbin cases, as opposed to drop-in bobbins, as is found on most horizontal hook machines. The vertical bobbin/bobbin case machines offer two styles of bobbin case: plain and anti-backlash. The anti-backlash cases have a thin star or ring shaped spring inside them; plain do not. This spring is there to keep the bobbin from free-spinning at a different speed than the shuttle, which can cause it to unload gobs of thread, which can lead to jamming the shuttle, or wrapping bobbin thread around other windings, halting the feed totally. This anti-backlash feature is useful for people who load their bobbins in the same feed direction as the shuttle is rotating. But, anti-backlash cases remove some often needed in/out clearance around the bobbin case, where the top thread goes around it and picks up the bobbin thread. If the anti-backlash spring pushes the bobbin in too hard and far - it will increase the minimum bobbin tension, no matter how much you back off the bobbin case spring. Furthermore, it can hold onto the top thread as it gets picked off the needle and feeds around the bobbin case, rather than letting it flow around freely. There needs to be some clearance on both sides of the bobbin case, in a vertical hook machine, for the top thread to go around both sides of it. Therefore, rather than using anti-backlash bobbin cases, I prefer to insert the bobbins to feed in the opposite direction as the shuttle rotates. Same no-unwinding result, without losing clearance for thicker thread to go around the case. Note: any lockstitch machine, no matter what type of bobbin system it uses, must have some clearance around the bobbin (and case if exists), sufficient for the top thread to pass between the bobbin (case) and the shuttle that is sits in. In vertical hook machines, the movement is inside and outside the snap-in case and the bobbin inside it. In horizontal drop-in bobbin machines, it is over and under the bobbin itself. Edited June 19, 2011 by Wizcrafts Quote Share this post Link to post Share on other sites
oldtimer Report post Posted June 19, 2011 The bobbin should feed in the opposite direction as the shuttle is rotating. This will make it harder for it to unwind at high speed, or after sudden stops. So, if your bobbin drive rotates clockwise, insert the bobbin counter-clockwise; against the rotation. Vertical hook machines have snap in bobbin cases, as opposed to drop-in bobbins, as is found on most horizontal hook machines. The vertical bobbin/bobbin case machines offer two styles of bobbin case: plain and anti-backlash. The anti-backlash cases have a thin star or ring shaped spring inside them; plain do not. This spring is there to keep the bobbin from free-spinning at a different speed than the shuttle, which can cause it to unload gobs of thread, which can lead to jamming the shuttle, or wrapping bobbin thread around other windings, halting the feed totally. This anti-backlash feature is useful for people who load their bobbins in the same feed direction as the shuttle is rotating. But, anti-backlash cases remove some often needed in/out clearance around the bobbin case, where the top thread goes around it and picks up the bobbin thread. If the anti-backlash spring pushes the bobbin in too hard and far - it will increase the minimum bobbin tension, no matter how much you back off the bobbin case spring. Furthermore, it can hold onto the top thread as it gets picked off the needle and feeds around the bobbin case, rather than letting it flow around freely. There needs to be some clearance on both sides of the bobbin case, in a vertical hook machine, for the top thread to go around both sides of it. Therefore, rather than using anti-backlash bobbin cases, I prefer to insert the bobbins to feed in the opposite direction as the shuttle rotates. Same no-unwinding result, without losing clearance for thicker thread to go around the case. Note: any lockstitch machine, no matter what type of bobbin system it uses, must have some clearance around the bobbin (and case if exists), sufficient for the top thread to pass between the bobbin (case) and the shuttle that is sits in. In vertical hook machines, the movement is inside and outside the snap-in case and the bobbin inside it. In horizontal drop-in bobbin machines, it is over and under the bobbin itself. Thank´s Wiz ! / Knut Quote Share this post Link to post Share on other sites
