Juki 1541S Lose Stitches

[Wizcrafts]

Bigger diameter needles are deflected less than thin needles, for any given length. The longer the needle system, they greater the deflection.

Needles get deflected by the thread pulling on the way down, as well as by the last stitch on the upstroke. The more tension you have on the thread, the greater this effect will be.

As I said before, when sewing Naugahyde, you should back off top and bobbin tensions. It shouldn't take much tension to bring the knots up between the two or four layers. Move up one needle size if necessary.

[Paulmin]

I've been reading some threads here with anticipation of seeing my issue. I will inject that I have a Consew 1541 like the juki namesake. The problem I have with loopy stitching is right after a corner turn. The lower thread gets all loopy. When sewing vinyl it become much more noticable of an issue. I have another machine a 205RB and it sews the vinyls fine. The 1541 sews well except on corners and worse on corners with vinyl. All this is when using 5/32 welt cord and a 1/4" welt foot. Have tried a few welt feet. I'm going to see if the needle is being deflected when turning corners. I us a 140 needle and 69 polyester thread.

  Interesting threads here I must say.

 

[brmax]

Do you use the same needle size in the other machine. Possibly with bigger thread, just curious why the 140 vs a 110 maybe. 

Not that this would have a big effect here, but i do like to ask. 

 

Have a good day

Floyd

[dikman]

140 needle is a bit big for #69 thread.

[Paulmin]

Same size needle 140s in both machines. I use 110 or 120s when sewing thinner material but it misses on thick stuff like vinyl and other thicker fabrics so I go to 140s.

[dikman]

Just curious, what do you mean "misses"?

[DonInReno]

On 8/15/2018 at 7:36 PM, Paulmin said:

The problem I have with loopy stitching is right after a corner turn. 

 

Of course put in a new needle so you’re not trying to solve a problem caused or partially caused by a bent, misaligned or dirty needle.

The first thing that comes to mind is a little extra upper tension is needed to pull the loops up, especially since the material thickness affcts the problem.  On a corner the thread does not necessarily have the same pressures on it as the needle withdraws.  

If there’s a skipped stitch right after the turn with loops after that then the hook isn’t grabbing the thread loop - do you allow the needle to raise a little after bottoming out in the stroke BEFORE turning the material?  Of course hook timing is important and needle to hook gap should be minimal to reduce any skipped stitch.

[Northmount]

On 8/15/2018 at 8:36 PM, Paulmin said:

I've been reading some threads here with anticipation of seeing my issue. I will inject that I have a Consew 1541 like the juki namesake. The problem I have with loopy stitching is right after a corner turn. The lower thread gets all loopy. When sewing vinyl it become much more noticable of an issue. I have another machine a 205RB and it sews the vinyls fine. The 1541 sews well except on corners and worse on corners with vinyl. All this is when using 5/32 welt cord and a 1/4" welt foot. Have tried a few welt feet. I'm going to see if the needle is being deflected when turning corners. I us a 140 needle and 69 polyester thread.

If this is only happening after you turn a corner, there are two things to watch for.  1. Lifting the presser foot too high releases the top tension leading to loose stitching and sometimes to a birds nest on the bottom. 2. Make sure the needle has risen far enough that the hook was able to grab the loop.  Turning the object before the hook has caught the loop may result in a dropped stitch.

Tom