Odd Notches On Hook Shuttle Basket

[Uwe]

I noticed these notches on the bobbin basket on my new-to-me Adler 67. My Consew 225 has similar notches on bobbin basket. I previously assumed these were defects or damages of some sort.

Now I'm wondering if the notches serve a purpose, but I can't think of one.

Does anybody know if these notches are supposed to be there or if I should go shopping for a new bobbin basket?

Edited July 3, 2015 by Uwe

[Cascabel]

I dunno...... They look too even in size,spacing, and depth to be worn areas. Probably milling cuts for some purpose.....

[Constabulary]

I´d guess for some oiling purposes - I also have notches in my Singer 111 hook. They are normal.

[Gump]

I would have to say that they are for clearing lint and debris out of the shuttle journal so that it doesn't bind up.

[shoepatcher]

They might possible be slots to put a straight bladed screw drive in to reengage the safety clutch. The 467 and 767 hook has a slot in it for that purpose.

[Uwe]

I finally found a reference to these bobbin case notches in a Singer 9W manual. Apparently they are used as a reference to line up the bobbin case in a certain position for removal.

Here's a screen capture of the relevant portion:

[Uwe]

I tried it out and the bobbin case indeed popped out easily when aligned as shown in the picture. (The bobbin case needs a thorough cleaning!)

I'm guessing the other two notches serve some other purpose for a different task.

Thanks for everyone's input on this!