usual, the side of the needle and the point of the looper are apt to incur breakage due to the impact of
the needle side against the looper point
, ( 25) .
21 The timing of needle guard (Fig.25)
The timing of the needle guard depends on the condition of the plane on the rock
shaft of the looper when no.1 screw has been screwed into this rock shaft.
, ,
, ( 26) .
( 26) , 0.1 0.2mm,
.
22 Position of needle guard：(Fig.26)
Oscillating the needle guard to make the needle tip contact with needle gauge slightly.
It is recommended that the height adjustment shall mot fall within the area of the left counter
needler guard; the adjustment can be made by loosening screws 1 and 2. The relation between left
counter needle guard and the counter needle guard is as represented in Fig.26; the clearance from the
needle falls within the range of 0.1 to 0.2mm.
Note that the forced clamp of the needle shall be prohibited when the machine is in motion.
27 , , 18°
20°, B , .
A , .
23 Looper thread take-up cam (Fig.27)
Its position can be seen as shown in Fig.27 When the needle bar is at the top dead centre,
the planes of the cam and the steel wire are in parallelism; the projecting
. 13 .
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