SunStar KM-957 Series User Manual page 25

Post bed with driven roller foot, drop-feed back tack sewing machine
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Adjusting movable knife and fixed knife
As shown in Figure 44, move the movable knife ① and restore the position slowly. When doing so, fix the
position of the fixed knife ③ so that edge ④ of the fixed knife ③ touches the 3mm before the fixed knife
trimming point ②.
After aligning the fixed knife ③ and the top of the movable knife ①, be sure to stick the upper side
side
of the knife edge to the external side of the movable knife edge.
Under the above conditions, tighten the fixed knife clamp screw ⑤. Be sure that the fixed knife does not move.
After adjustment, move the trimmer manually once again to check the cross section of the fixed knife and the
movable knife as in the figure.
Final fixing of the movable knife' s initial position
※ The standard initial assembling position of the movable knife ① is where the movable knife-edge protrudes about 0.5~1mm ③
from the fixed knife edge ② when the trimming action is finished, that is, when the movable knife is in its initial stop position.
When fixing the position of the movable knife, the following directions must be followed so that the power generated in the cam
④ is delivered without any loss to the trimming action.
[Adjustment Order]
ⓐ Manually turn the pulley to finish trimming of the trimming cam ④. Place the cam so that the roller ⑥ can enter the
complementary straight line ⑤.
ⓑ Slightly loosen the fixing screws ⑦ ⑧ of movable knife shaft crank of both the left and the right.
ⓒ Press the roller ⑥ inside the cam by operating the trimmer solenoid. Push the linking bar ⑨ to the right or the left crank
linking rod ⑩ to the left so that there is no excess room in each linking device. When this is done, the roller ⑥ gets to
adhere to the right side of the cam' s complementary straight line ⑤, as can be seen in the picture ⑪. While maintaining
this position, adjust to make the movable knives on the right and the left protrude about 0.5~1mm from the fixed knife-
edge. Now, tightly fasten the crank fixing screws ⑦ ⑧ on both sides.
ⓓ If the initial position of the movable knives of both sides are to be adjusted slightly, use the ball joint linking bar ⑨. If
only the movable knives are to be adjusted, use the linking rod ⑩.
* Cross section of the fixed knife
and the movable knife
Top side adhesion
and bottom
good
bad
bad
[Figure 44]
[Figure 45]
25

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Km-967 series

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