Belt Issues
The belts slip or come off the pulleys:
If belts stretch after prolonged use, you may need to adjust the belt tension. To do this, loosen
the screw (
A
) in the curved slot above the motor (pulley end) in the aluminum bracket (
69
).
Pivoting the motor back will tighten the belt between the motor and the idler pulley, which is
attached under the table top.
If the longer belt also requires adjustment, it should be done first. Move the idler pulley down to
tighten the long belt. To do so, loosen the pulley shaft (
B
)
using the box wrench provided and
slide the pulley on its bracket (
70
). Tighten when done.
Stitch Master Timing
The timing of your machine is determined by the relationship of the needle to the gib
hook. The gib hook picks up the upper thread at the needle and carries it down around
the bottom of the bobbin case where the upper thread loop is pulled tight by the take
up arm above the needle bar.
Starting on p. 59, follow these steps to adjust the timing on your Stitch Master:
About the Class 15
Shuttle Hook System
The Stitch Master has a class 15 shuttle
hook system. In this system the gib hook
oscillates back and forth around the bobbin
case in half turns (
71
) carrying the upper
thread around the bottom of the bobbin case.
Once this is completed, the hook reverses
direction and returns to its original location.
This movement is geared by a simple yoke
and cam arrangement on the top shaft of the
machine. It is a relatively simple design but is
both reliable and satisfactory for leather work.
69
70
71
A
B
Stitch Master
®
Guidebook: Troubleshooting
58
57
