Pfaff 545 Alignment of Bobbin case Cap & Base

[friquant]

How should the fingers of the bobbin case Cap align with those of the bobbin case Base?

Attaching a photo of the alignment I've got. The alignment looks off to me on two accounts:

1. the hole one the Cap is offset form the hold on the Base

2. The longest protrusion of the Base sticks out farther than the longest protrusion of the Cap.

The symptom is that when the thread comes around the bobbin, sometimes it gets caught on the outermost protrusion of the bobbin case Base, so instead of making a stitch in the fabric it has made a loop around the undercarriage.

With TEX 90 or TEX 70  thread the machine is usable, as then the above-named conundrum only happens if you pull excessively on the needle thread while hooking the bobbin thread.

But with TEX 30 it happens even during normal stitching...It might get five or six good stitches in before it locks up. (Not that I expect to be doing much stitching with TEX30, but we didn't yet have the color we wanted in a heavier thread.)

 

I'd be interested to see photos of alignments on other 545s, and especially to hear if anyone has adjusted/modified their alignment to make it work more reliably.

[nejcek74]

Pfaff 1245

Pfaff 1242

Pfaff 142

Are you sure you had the right bobbing case? Or the hook assembly? Maybe something was changed for a wrong or unoriginal part, I don't remember any setting for this, bobbin case just drops into the hook. Check the exploded view of parts for Pfaff 545 and the engineering manual for the Pfaff 1245.