Fig.10 shows the first stage in stitch formation. The thread leading to the needle is loosened, because the thread take-up lever has begun its descent the needle, after having descended to its lowest point, has been slightly raid and a loop of thread is thus formed which is immediately entered by the point of the hook.
This type of hook makes part of a revolution during the beginning of each stitch, the direction being indicated by the arrows in Figs. 10 and 11, and during the completion of the stitch the direction of the hook is reversed as shown by the arrows in Figs. 12 and 18,
The hook oscillates around the bobbin cane which ix held stationary.
taken by the point of the hook and is being passed around the bobbin case containing the bobbin of under thread. sufficient enlargement of the loop having been permitted by the descent of the thread take-up lever.