l. PRECAUTIONS BEFORE STARTING OPERATION ............... 1 2. MAIN SPECIFICATIONS ....................1 3. PREPARATION AND LUBRICATION................ 2 4. REPLACE NEEDLES ..... . 5. NEEDLE, THREAD AND MATERIAL TO BE SEWN .............. 3 6.
3. PREPARATION AND LUBRICATION 1) Cleaning the machine Before leaving the factory, the machine parts are coated with rust-preventive grease, which may be hardened and contaminated by dust during storage and shipment. This grease must be removed with gasoline. 2) Examination Though eyery machine is confirmed by strict inspection and test before leaving the factory, the machine parts may be loose or deformed after long distance transportation with jolt.
5. NEEDLE, THREAD AND MATERIAL TO BE SEWN 6.THREADING (Fig.3) To thread the needle thread, raise needle bar to the upper end of its stroke, lead the thread from spool arid perform threading as shown in Fig.3. To draw the bobbin thread, hold. the end of the needle thread and turn the balance wheel to lower the needle bar and then to lift it to its highest position.
12. ADJUST THREAD TENSION (Fig.10, 11) clockwise until spring (C) comes to the notch of thread tension regulating bushing, and again tum tension stud (B) halfway back (counter-clockwise) After the adjustment, tighten set screw (A). 2) Adjusting the thread take-up spring stroke Loosen set screw (B), tm' n stud (C) clockwise to increase the stroke or turn stud (C) counter-clockwise to decrease the stroke.
Thread guide position Leftward Center Rightward Material weight . Heavy Medium Light Fig.12 shows different stitch forms. Normal stitch form should be as shown in Fig.12 (a). When abnormal stitches cause puckering and thread break-age, the tension of needle thread an� bobbin thread must be adjusted accordingly. 1) In case needle thread tension is too strong or bobbin thread tension is too weak, as shown in Fig.12 (b), turn the thumb nut counter-clockwise to decrease the needle thread...
(5) After the· adjustment, tighten set screw (B) and put in the rubber plug. The standard needle timing (Fig.15) is to align timing mark (B) on the needle bar and the bottom of needle bar bushing (A) and meanwhile align the inner surface (E) of . the hook and the center of needle eye (D) when the needle bar gets down to its lowest position.
17. ADJUST 'I'HE POSITION OF 2) Loosen screw (A) of feed lifting rock shaft crank right (See Fig.19, b) 3 ) Move feed bar (B) in the direction shown by the arrow in Fig.19 ( a) to adjust the height of the feed dog. The standard height offeed dog is that the top of feed dog is 0.8nnn above throat plate surface (B).
· ----····--·· · -· ·--······ . •. ··· · · · ··· · · ·· · -··· · ·····-·----·--- · · · ·· -------- The standard timing of teed motion 10 11f·ecl le 111ot ion is that tlic Lnp of 1red dog (C) is flush with throat plate surface (B) when the point of needle (A) reaches throat plate surracc (8) (Fig.21.) If feed motion is not timed lo ncccllc 11101io11.
21. REGULAR CLEANING (Fig.27) ) ) Cleaning feed dog Remove the throat plate and clear olT the dust and lint between feed dog tooth slots. 2) Cleaning rotating hook Swing out the machine head and clean the hook. Wipe the bobbin case with soft cloth. Feed dog 3) Cleaning oil pump, screen Swing out the machine head and clear off the dust...
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