121. Right Hand Looper Adjustment - Singer 812U Instruction Manual

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Standard
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L
specifications 4.7 mm
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High-lift
specifications 2.2 mm
(2) Tilt the left hand looper by 1 - 1.5 mm, insert it ali the
way into the left hand looper holder, and ínstall it.
(3) In case of sewing machine made to the standard speci-
fications, adjust the distance between the left hand
looper point and the needle center to 4.7 mm when
the left hand looper ís at the left-most position.
The sewing machine of the hígh-lift specifications must
be adjusted to a distance of 2.2 mm between them.
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0- O.OS mm
(5) Foregoing the condition of (4), push the needle with
movable needle guard. until there is a clearance of
O - 0.05 mm between the needle and the point of the
left hand looper.
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L -
0.01 - O.OS mm
Push needle
(4) With the point of the left hand looper in line with tne
center of the needle, make an adjustment so that the
point of the left hand looper will push the needle 0.01
- 0.05 mm (i.e., slight1y contact the needle) in the
upward travel of the needle.
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Right hand looper adjustment
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There are right hand loopers: Standard type, high-lift type,
B A
Meeting point
(2) Select meeting measurements fromthetable below.
(1) Make an adjustment so that, when
right hand looper
8
meets left
hand 100perCi), the point of the
right hand looper will pass clear of
the left hand looper about 0.1
mm below its projected parto
. (In millimeters)
~c.
Standard .
High-Iift
A
7.2
8.2
B
S.O
S.O
(3) The meeting measurements of
spreader (for two-thread) (Dare
the same as those of the right
. hand looper.
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Check part
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on the right hand looper arrn and see whether the machine is for
standard use (S) or high-lift use (H).
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