How To Take The Bobbin Case On And Off; Adjusting The Upper Thread Tension; Adjusting The Upper Thread Sensor - SunStar SPS/E-BH3100 User Manual

5) How to take the bobbin case on and off

Hold the knob of bobbin case, and push it into the shuttle until
it makes a sound.
If you start operating the machine under the state
that the bobbin case is not perfectly installed, the
thread will be entangled or the bobbin case will
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be protruded.

6) Adjusting the upper thread tension

A. As in the figure when the secondary thread adjusting device
's tension adjusting nut
thread tension gets strong, and when it is turned otherwise,
the tension gets weaker.
B. When adjusting the tension of the thread take-up lever
spring, disassemble the emergency switch cover and move
the ball screw nut of the thread adjuster to the most right.
Properly place the nut at the groove on the thread tension
adjuster shaft edge
adjusting spanner.

7) Adjusting the upper thread sensor

A. Unfasten the joint screw of the thread sensor pin in status
that a thread does not hang on the thread take-up spring,
and adjust to contact the thread take-up spring and the
sensor plate, and then fasten the joint screw.
B. Adjust to contact the thread spring and the sensor plate
certainly regulating the positions of the thread sensor plate
even when the stroke of the thread take-up spring has been
changed.
Pay your attention not to contact any other
metals on the thread sensor plate except for
the thread take-up spring. It runs a chance of
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failure to detect thread.
The distance between the thread take-up
lever spring and the upper thread
10mm
adjusting lever should be adjusted to be
10mm.
is turned clockwise, the upper
and turn it clockwise using the thread
①
①
13
[ Fig. 10 ]
②
④
Spanner
[ Fig. 11 ]
Joint screw
Thread sensor plate
Thread take-up spring
[ Fig. 12 ]