Help Needed

[RickV]

Hello All,

 We are having an issue with cylinder arm machines as of late.  The machine mechanic and myself have been working on the same machine for months and no ground has been gained.  The current problem we are having has to do with the tension on the machine.  There is tension on the top(too much for our liking) and there is absolutely no tension on the bobbin(we have replaced tensions spring several times) but somehow the thread is being pulled through the bottom of our leather.  Its a mystery that we have not been able to solve so i am hoping that someone out there may have some insight as too what can be done to fix it or if its a lost cause.

 

Thank You

[Dwight]

What brand of machine do you have??

May God bless,

Dwight

[RickV]

Dwight,

 

  The machine is a Consew227R-2.  If it would help any we use the cylinder machines to put the binding on ballgloves.

[Wizcrafts]

I have a clone of that machine: a Techsew 2700. If your bobbin thread keeps popping out of the tension spring, reverse the direction of the tbobbin. I usually insert bobbins so they feed against the direction of the slot and spring. This ensures  good, controllable tension and keeps the thread from jumping out of its channel. Make sure that both little screws are holding the spring in place. The one closest to the exit position controls the tension. The other one keeps it in place on the case. If you are unable to get adjustable tension in the bobbin case, replace it!

Assuming you can gain control of the bobbin tension, check the entire top thread path for kinks or sharp turns, or excessive twisting from overly coily thread. If your thread is too twisty, replace the spool and try balancing the tensions again. Or, counteract the twist using the holes in the top guide post. I do that anyway, feeding through the top hole, bringing the thread around the front, then through the bottom hole. This gives a counter twist to offset any twist in the thread cone.

Make sure you are threading correctly according to the manual. Adjust the check spring tension so it only has enough force to bring the spring down against the back stop bracket, wherever it is set to stop the spring. Then adjust the position of the slot to give the best lay of the thread without making a popping sound as it goes around the bobbin case and shuttle.

Finally, if you still have trouble with the tension, remove the top tension spring and disks and inspect them for burrs. Ditto for all the guides and even the take-up lever. Do not wrap thread around the pin on the right side of the top disks. It is not there for that purpose.

[kgg]

39 minutes ago, RickV said:

If it would help any we use the cylinder machines to put the binding on ballgloves.

A couple of questions. How thick is the material being sewn, what size thread (top and bobbin) and with what size needle? A couple photo's of the top thread path maybe helpful along with the item being sewn.

kgg

[RickV]

20 minutes ago, Wizcrafts said:

I have a clone of that machine: a Techsew 2700. If your bobbin thread keeps popping out of the tension spring, reverse the direction of the tbobbin. I usually insert bobbins so they feed against the direction of the slot and spring. This ensures  good, controllable tension and keeps the thread from jumping out of its channel. Make sure that both little screws are holding the spring in place. The one closest to the exit position controls the tension. The other one keeps it in place on the case. If you are unable to get adjustable tension in the bobbin case, replace it!

Assuming you can gain control of the bobbin tension, check the entire top thread path for kinks or sharp turns, or excessive twisting from overly coily thread. If your thread is too twisty, replace the spool and try balancing the tensions again. Or, counteract the twist using the holes in the top guide post. I do that anyway, feeding through the top hole, bringing the thread around the front, then through the bottom hole. This gives a counter twist to offset any twist in the thread cone.

Make sure you are threading correctly according to the manual. Adjust the check spring tension so it only has enough force to bring the spring down against the back stop bracket, wherever it is set to stop the spring. Then adjust the position of the slot to give the best lay of the thread without making a popping sound as it goes around the bobbin case and shuttle.

Finally, if you still have trouble with the tension, remove the top tension spring and disks and inspect them for burrs. Ditto for all the guides and even the take-up lever. Do not wrap thread around the pin on the right side of the top disks. It is not there for that purpose.

We have replaced all springs with new parts on 2 different occasions.  The issue is that we can have the top tension adjusted to have way more tension than the tension spring on the bobbin, as well as taking all tension off of the bobbin and it is still pulling through the bottom. i will run through these suggestions and double check that the bobbin is in correctly.

[RickV]

6 minutes ago, kgg said:

A couple of questions. How thick is the material being sewn, what size thread (top and bobbin) and with what size needle? A couple photo's of the top thread path maybe helpful along with the item being sewn.

kgg

The materials that are being sewn togethar are as follows

 

Leather-2.1-2.3mm

Binding-.8-1.0mm

 

When checking the adjustments we made we are sewing through 2 pieces of leather so the total thickness woule be between 4.2-4.6mm thick. i will follow up with pictures.

[Wizcrafts]

Try moving up 1 or 2 needle sizes. A bigger hole takes pressure of the thread knots and makes them easier to pull up.

10 minutes ago, RickV said:

The issue is that we can have the top tension adjusted to have way more tension than the tension spring on the bobbin, as well as taking all tension off of the bobbin and it is still pulling through the bottom.

 

[RickV]

Our current needle size is 135x17 and the thread weight is 135

[RickV]

This is the top side ^