Cobra class 4 not feeding material

[LFR]

 

Cobra class 4:

      Issue: material won’t feed through. Whatever material is put to sew it just bounces back and forth and the needle drops through the same hole.

Here linked to YouTube is a slowed video of the feed action. YouTube video
     
      Background: The problem originated when I was sewing a difficult piece and I think I got the needle into the throat plate. The needle wouldn’t advance but didn’t break. The machine seemed kinda locked up while I tried to hand reverse. I don’t believe I “forced” anything, but with a little rocking it gave and I got the peice out and the thread cleared. 
     As a result the presser feet were out of timing. I reset them though in the video they might still be a little off. 
    Assessment: The important determinations I’ve already made from other problem solving advice:
       1) the motor is running forward as it should be-with the stitch lever down the wheel turns clockwise from the operators position.
       2) The center foot seems to be out of sync with the rest of the action-   With the stitch lever down, the center foot is down when returning towards the operator.

   Discussion:  I believe the center foot  is my issue- that the center foot is out of timing with the rest of the action. I believe the center foot should be up when returning towards the operator when sewing forward/lever down. I’m pretty handy but  I have no clue where to start tinkering with this problem. I’m getting desperate to be back up and sewing so I’m trying to get more insight from the community before I look to call in a professional. 

         Any suggestions to further assess the problem, or steps to try and fix it?

Thanks, folks.

Edited May 16 by LFR

[kgg]

  On 5/16/2025 at 1:08 PM, LFR said:

the motor is running forward as it should be-with the stitch lever down the wheel turns clockwise from the operators position.

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The handwheel, that has the drive belt from the speed reducer, should turn towards you in a counter clockwise motion. If it is moving in the clockwise motion it can / will cause damage to the machine.

kgg

[AlZilla]

  On 5/16/2025 at 10:57 PM, kgg said:

The handwheel, that has the drive belt from the speed reducer, should turn towards you in a counter clockwise motion. If it is moving in the clockwise motion it can / will cause damage to the machine.

kgg

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Good catch. Go look at his video. It looks to me like the machine is running backwards.

[LFR]

The motor is definitely running in the correct direction. Sitting in the operators position the wheel is turning in the correct direction. It is not running backwards. 

[AlZilla]

  On 5/17/2025 at 12:33 AM, LFR said:

The motor is definitely running in the correct direction. Sitting in the operators position the wheel is turning in the correct direction. It is not running backwards. 

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Compare your video to this one. Looks like yours is going the wrong way.

EDIT: The needle is going up and down at the right time but the foot isn't. Looks like to me, anyway. Somebody here will know exactly what it is.

Edited May 17 by AlZilla

[TomE]

Once you determine that the machine is turning in the correct direction, you can adjust the walking foot mechanism per this excellent video from @Uwe Gross.  His video on setting the hook timing for the Juki 441 class machines is also very instructive.  

 

 

Edited May 17 by TomE