Juki 1541s Clone Bobbin Case Comparison

[brmax]

No, not this part rather this lever (sometimes called opening lever) helps move the bobbin basket & case assembly slightly.

In this its a repeated movement and the thread gains a clearance. This thread clearance is obtained directly 12:00 position of the lever you see or top of the hook area in the photo.

We can notice the thread when assembled with machine tilted back (hand turning/power off) as sewing scrap. The hook makes its revolution and the thread moves around the finger/tab slot. This is a repeated movement and regulated by the bobbin case lever mentioned.  

In short the juki 1541s  is this style requiring its own design hook and includes a safety clutch mechanisim on the shaft. The standard 1541 as mentioned and some like it, are designed with different hook design that requires no bobbin case opening lever. Also this standard Juki did not include the saftey clutch. Some of these others of late I understand do have the safety clutch mechanism on shaft.

In some extra moments, these opening levers in operation can be easier seen on the “top” loading bobbin machines. While some videos are showing the opening of that area for thread clearance and adjustments. Theres also some good reads and important info on that tab or finger with these style machines. 

 

Hey its Friday! Have a good day

Floyd

Edited January 18, 2019 by brmax

[Gregg From Keystone Sewing]

12 hours ago, JJN said:

@Foiler, I think Gregg was referring to the part in this photo when he said 'bobbin case opening lever'. Not the latch on the bobbin case itself.

 

Sorry for any confusion, yes, this is what I was specifically referring to.  The concept of the bobbin case opening lever is to help allow for heavier thread to more easily pass through the hook position finger, also known as a hook supporting plate.  See attached pdf that I made up showing this area of the machine that I'm talking about, thanks.

Juki DNU-1541S Hook Supporting plate install and adjusting.pdf

[rchaven]

On 1/17/2019 at 12:36 PM, Foiler said:

Dale, not sure if this helps you out but I just purchased a Thor GC-1541s and it has a Japanese hook assembly as well as the bobbin case opening lever. I think these clone machines have gotten way better over the years. I know that my new machine is ripping through leather better then my gc-0303 clone machine could. Also its not scaring the leather face from the presser foot walking across the surface. So enjoy your new/used Econosew machine. Now here is a bobbin question since this started out about bobbins  on a 1541s clone. My new Thor has the 110* offset bobbin case, same as my gc-0303, however the bobbins from the 0303 will not fit into the Thor hook pin. Using my calipers the 0303 bobbin case center hole is 4.40mm, and the Thor bobbin case center hole is 4.50mm.  When i ordered extra bobbin cases for my 0303 I just ordered type M cases and they fit and worked. Looking back perhaps I got lucky. So here is the part number I came up with that should work B1837-241-H00 which is for Juki 1541,1541s, dnu-241HS, DSC- 246. Also under this part number B1834-241-H00. No one mentions the difference in center hole diameter. This would just make it so simple. I know you may say that is what happens when you buy a clone. However its like everything else in the manufacturing world, there is no standardization. Same in the hobby world that I was a big part of meaning the Radio Control world. Anyway I hope this helps and if not I tried. If one doesn't ask then one can't learn. thanks for your time in advance

 

On 1/17/2019 at 5:31 PM, JJN said:

@Foiler, I think Gregg was referring to the part in this photo when he said 'bobbin case opening lever'. Not the latch on the bobbin case itself.