4-35.
When timing the pressure lifting
eccentric, you should set the sewing
machine at
1.
3 1/2 SPI
2.
5 SPI
3.
8 SPI
4.
32 SPI
4-36.
What is the purpose of the thread
controller spring?
1.
It prevents the bobbin thread
from breaking
2.
It prevents the upper thread
from breaking
3.
It prevents the sewing hook
from piercing the thread
4.
It prevents the needle from
piercing the thread
4-37.
Which of the following statements
concerning the thread controller
spring is correct?
1.
It rests on the thread controller
spring stop as the point of the
needle enters the material
2.
It rests on the thread controller
spring stop as the needle reaches
its highest point
3.
It prevents the bobbin thread from
jamming under the throat plate
4-38.
When adjusting the thread tension and
you cannot properly adjust it with the
upper thread tension disc, what action
should you take?
1.
Change the size of thread
2.
Change the needle size
3.
Adjust the bobbin tension
4.
Adjust the presser foot tension
4-39.
If your machine is hard to turn after
you time and adjust it, which of the
following actions must be performed
first?
1. Check the feeding action
2.
Remove the arm shaft connection belt
3.
Remove the throat plate and set the
stitches to zero
Learning Objective: Identify
the functions, adjustments,
timing and general maintenance
applicable to the 31-15 sewing
machine.
4-40.
Which of the following is an oscillating
type sewing machine?
1.
31-15
2.
331K1
3.
Consew C-30
4.
Each of the above
4-41.
The 31-15 sewing machine will sew
canvas up to
1.
4 oz
2.
6 oz
3.
8 oz
4.
10 oz
4-42.
What is the stitch range on the Consew
C-30?
1.
5 to 30 SPI
2.
7 to 32 SPI
3.
5 to 27 SPI
4.
7 to 27 SPI
4-43.
What is the clearance between the
presser foot and the throat plate at
the 31-15 sewing machine?
1.
One-fourth in.
2.
One-eighth in.
3.
Seven-sixteenths in.
4.
Five-sixteenths in.
4-44.
Which of the following is the main
timing point on a 31-15 sewing machine?
1.
Hook drive gear
2.
Hook pinion gear
3.
Needlebar
4.
Balance wheel
4-45.
When you set the needlebar and it starts
its upstroke, what is the distance of
the hook in relation to the eye of the
needle?
1.
One-sixteenth inch above
2.
One-sixteenth inch below
3.
One-eighth inch above
4.
One-eighth inch below
4-46.
To set the feeding action on a 31-15
sewing machine, you must loosen which
of the following screws?
1.
Feed dogs setscrew
2.
Feed dog cam fork setscrew
3.
Feed-driving rock shaft crank pinch
screw
4.
Feed-driving rock shaft connection
pinch screw
18
