Looking for cylinder arm for leatherbag making. Necchi 840-100

[marinicarlo]

On 5/9/2019 at 2:33 AM, luxuryluke said:

So, after another semi-thorough cleaning, disassembly, oiling, reassembly, and inspection of the mechanics in the needlebar  and bobbin case/hook areas, I did determine that the needle bar could be adjusted to fit the standard walking foot needle size of 135x16L on this machine. After this, I've noticed:

1. At top dead center, the needlebar does top out by kissing the top of the case, so it really can't be raised anymore.
2. At bottom dead center, it doesn't hit the center of the hook assembly inside the needle gap.
3. The needle is now closely aligned to have the hook enter the scarf of the needle at the right timing and sews well with no noise or breakages

The result is that the effective stitch length is not near what it was before with the previously installed needle by the previous owner. At the longest stitch setting it went from almost 5 stitches per inch up to around 6+ stitches per inch.

I'm sure it's the geometry of the changes a new needle size made to the setup, but I'm not knowledgeable enough to know whether the new setup is better or not for the machine. I do know that this likely isn't the correct needle for this machine, but it's working really well at this point (badump).

Below you'll see that the booklet I have specs it as a 134 needle system. Thoughts?

 

134 LR are the ones. I own 840 I love it i am from italy and here we can find parts ...please be in contact with me if you would like to exchange experience on the usage. by the way do you have any manual of the 840? this is the only thing i can't find

[shoepatcher]

On 2/25/2019 at 10:50 PM, luxuryluke said:

Indeed. Is Pfaff the originator of this shape/type of cylinder machine or is Adler? Or even someone else?

Singer came out with the 153 class which was copied by Seiko for the Seiko model and the Consew model 227.  Singer made a narrow throat walking foot.  Not sure of the exact class.  Think it was a 123 or 126.  I saw a picture of  one years ago.  I believe the Pfaff 335 came out before the 69 Adler.