Lewis 17 - Thread Controller Spring

16
K. This will reveal a screw that holds the hook bushing in posit ion
through the flange on the bushing. This bushing is eccentric and turn-
ing it will change the height of the hook. Two holes are provided for
the screw, thus giving a wide range of adjustment.
BOBBIN CASE RELEASE
See Plate 4 Page 34
49. Bobbin case release 445-251 is operated by the lever
mounted on the needle carrier. This release should be adjusted so
that the needle thread passes fr.eely over the top of the bobbin case,
and so that the needle thread passes freely between the bobbin case
and the. bobbin case retainer, Figure F, Page 13 after the needle
thread drops off the beak of the hook. The setting of the bobbin case
release should always be checked after changing the height of the hook.
THREAD
CONTROLLER SPRING
Model 17-10
50. The thread controller spring 1187, Plate 7 Page 40 may be
adjusted by loosening screw LS 330 and turning staff 68-19 to the right
to increase the tension and to the left to decrease the tension. Hold
staff 68-19 in position with the screw driver and tighten screw LS 330.
This makes the adjustment permanent.
51. If the needle thread snaps as it passes over the top of the
bobbin case, it is an indication that either the tension on the thread
controller spring is too great or that the hook is a trifle slow, or both.
If the tension on the thread controller spring is not great enough, the
thread will not come off the hook fast enough with the result that the
hook will pick up the thread a second time causing the machine to break
thread.
THREAD CONTROLLER SPRING
Model 24-12
52. See automatic tension release Plate 7 Page 40-and
description on Pages 24 and 25.
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