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Posted

Thanks for your help in advance,

I'm new to this forum and have only been using my Consew 226 for about a year sewing mostly canvas and sailcloth.  I know that's a lot easier than leather but I think many of the same problems occur.  I'm amazed at the beautiful leather work shown in this forum. 

Recently, after I thread the needle and pick up the bobbin thread, when I start sewing the thread somehow escapes from the needle.  I know this is physically impossible as I trap both threads before sewing but...it is happening.  Of course when the thread escapes the needle the bobbin thread winds around the bobbin case.  Excuse me if I'm using the incorrect terminology; please feel free to correct me.  That's how I learn. I've changed needles, but the same problem keeps recurring.   In the past this occurred infrequently, but now it's happening every time.  It's very frustrating as I usually am able to solve most problems.

I'm looking forward to learning from some of  your wisdom and experience.

thanks,]

Bill

 

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Posted

Are you saying that even though you hold back both threads, the top thread is giving up at the needle? First, make sure you are using the correct needle system and size and that it is inserted with the thread channel on the left side and scarf on the right.

If the machine does sew at all that translates into the top thread is breaking (possibly from a burr). If you can't get any stitches at all, the timing has gone out (likely), or a safety clutch has popped. Inspect the hook to see if there is a jagged edge at or near the pointed end.

You can watch the timing as you hand wheel the machine. The needle should go down to BDC then begin to ascend. The tip of the hook should intersect the needle about 1/8 inch above the eye as it ascends. That's usually where the best loop forms on the right side of the needle. If the hook arrives after the eye of the needle has passed it, the timing is retarded. If it arrives below the hook, it is advanced.

The needle timing can be thrown out by impacts against metal or very hard material. Some machines have one screw holding the needle bar in position. A solid impact, or series of impacts can cause the bar to slip up enough to de-time the machine. A thread jam in the shuttle usually cause the timing to change. Some machines have a safety clutch that disengages the shuttle drive to protect it. If the clutch pops, you need clear out thread remnants in the shuttle and bobbin race, then hold down a button on the bed while turning the hand wheel, usually backwards, until it snaps back in the drive position.

Posted IMHO, by Wiz

My current crop of sewing machines:

Cowboy CB4500, Singer 107w3, Singer 139w109, Singer 168G101, Singer 29k71, Singer 31-15, Singer 111w103, Singer 211G156, Adler 30-7 on power stand, Techsew 2700, Fortuna power skiver and a Pfaff 4 thread 2 needle serger.

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Posted

Wizcrafts,

Thanks for your prompt reply.  The thread is not giving up at the needle, or breaking.  It stays intact, unbroken, but somehow comes out of the needle, even though both ends of the thread are intact.  I am using the same needles that I have used for a year, I changed the needle several times, and inspected the needles for failures using a microscope, but the needles appear to be fine.  I know it sounds impossible, but it's happening.  I'm an engineer and this has me baffled.

thanks,\

Bill

Posted

You never mentioned what size of thread you are using on top and in the bobbin or the type and size of the needles that you are using. My first thoughts would be to unthread everything top thread and bobbin. Reinstall top thread checking thread tension / paths from the spool to eye of the needle checking needle is installed correctly (right direction of scarf and needle fully seated). I would then thread a different fresh bobbin checking for correct tension and correct direction of bobbin spin in the bobbin holder. Then I would hand wheel it through a dozen cycles with fabric under the foot and with the bobbin cover plate off to watch as how it is trying to pickup the bobbin thread and sew.

kgg

 

 

Juki DNU - 1541S, Juki DU - 1181N, Singer 29K - 71(1949), Chinese Patcher (Tinkers Delight), Warlock TSC-441, Techsew 2750 Pro, Consew DCS-S4 Skiver

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Posted

I tried to attach a short video and a pic of where my bobbin thread exits but I'm limited to 1.46 MB and any video I have won't fit. 

It always worked so I never noticed where it exited the bobbin. It exits near the top of the bobbin housing at about the 8:00 position.   I removed the bobbin housing to clean it so maybe the hooked piece on the front is adjusted too loose.

Great idea to hand wheel it through.  Duh! I never thought of that.  Thanks for the suggestions.  I'm using 97 polyester thread on top and bottom from Sailrite.  I'll install a new bobbin and thread.

thanks again,

Bill

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Posted

I tried to attach a short video and a pic of where my bobbin thread exits but I'm limited to 1.46 MB and any video I have won't fit. 

It always worked so I never noticed where it exited the bobbin. It exits near the top of the bobbin housing at about the 8:00 position.   I removed the bobbin housing to clean it so maybe the hooked piece on the front is adjusted too loose.

Great idea to hand wheel it through.  Duh! I never thought of that.  Thanks for the suggestions.  I'm using 97 polyester thread on top and bottom from Sailrite.  I'll install a new bobbin and thread.

thanks again,

Bill

Sorry about the double post.  I'm new to this.

Great suggestion to post on youtube.  I also downsized my bobbin photo.

 

IMG_7114small.jpg

Posted

I looked at your video and what I noticed was that I think you may have threaded the needle incorrectly. It is a little hard to see blue thread on blue material. The needle has to be threaded from the left side of the needle with the scarf (long scratch on the needle) facing directly away from the bobbin then through the hole in the needle towards the bobbin.

I think what's happening is that the top thread is actually breaking around the bobbin hook area or being pulled back through the eye of the needle as the hook passes and then getting wrapped around the bobbin case.

Also I would recheck the installation of the bobbin in the bobbin case to make sure it is correct. To check, remove the bobbin from the bobbin holder and with the bobbin in your right hand grab the thread with your left hand. Pull the thread to unwind some thread from the bobbin. The bobbin has to rotate counter clock wise in your right hand. If it does then drop it over the centre pin of the bobbin case and lock the centre pin down over the bobbin and rethread.

kgg

Juki DNU - 1541S, Juki DU - 1181N, Singer 29K - 71(1949), Chinese Patcher (Tinkers Delight), Warlock TSC-441, Techsew 2750 Pro, Consew DCS-S4 Skiver

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Posted

I saw the starting top thread being held back outside the inner foot's hole. Try feeding the top thread through the hole in the inside foot before you sew. It may solve your mystery.

Posted IMHO, by Wiz

My current crop of sewing machines:

Cowboy CB4500, Singer 107w3, Singer 139w109, Singer 168G101, Singer 29k71, Singer 31-15, Singer 111w103, Singer 211G156, Adler 30-7 on power stand, Techsew 2700, Fortuna power skiver and a Pfaff 4 thread 2 needle serger.

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