CONTENTS
1. GENERAL
......................................................................................................1
(1) Features .................................................................................................................................. 1
(2) Applications ............................................................................................................................ 1
2. SPECIFICATIONS ........................................................................................ 2
3. NAME OF EACH COMPONENT
.................................................................. 4
4. ADJUSTMENT .............................................................................................. 6
(1) Adjustment of the belt tension .................................................................................................. 6
(2) Adjustment of the needle stop position .................................................................................... 8
1) How to sdjust the upper stop position (after thread trimming) .................................................. 8
2) How to sdjust the lower stop position........................................................................................ 8
(3) Adjustment of the wiper (WB type) ........................................................................................ 10
(4) Theory of thread trimming ...................................................................................................... 12
(5) Thread trimming sequence .................................................................................................... 13
(6) Adjustment of the timing of the thread trimmer cam .............................................................. 14
1) How to adjust the timing ........................................................................................................ 14
2) How to adjust the timing of the thread trimmer cam .............................................................. 14
(7) Adjustment of the position of the moving knife........................................................................ 16
1) Proper position of the moving knife ........................................................................................ 16
2) How to position the moving knife .......................................................................................... 16
3) When the moving knife can not be properly positioned merely by adjusting
the position of the link driving magnet pin .............................................................................. 16
(8) Adjustment of the counter knife .............................................................................................. 18
1) Properly installing the knife thread guide .............................................................................. 18
2) Adjusting the counter knife .................................................................................................... 18
(9) Adjustment of the floating amount of the tension disc No. 2 .................................................. 20
1) How to check the floating amount of the tension disc No. 2 .................................................. 20
2) How to adjust the floating amount of the tension disc No. 2 .................................................. 20
(10) Sharpening the counter knife ................................................................................................ 22
(11) Replacing the moving knife .................................................................................................... 24
(12) Replacing the knife thread guide ............................................................................................ 26
(13) Adjustment of the thread take-up picker ................................................................................ 28
1) Positioning the thread take-up picker...................................................................................... 28
2) How to adjust the position of the thread take-up picker .......................................................... 28
(14) Adjustment of the clutch disc and thread trimmer solenoid .................................................... 30
(15) Adjustment of driving arm stopper .......................................................................................... 32
(16) Adjustment of the knife mounting base .................................................................................. 34
(17) Adjustment of the one-touch type reverse feed switch lever .................................................. 36
(18) How to replace the synchronizer ............................................................................................ 38
(19) Adjustment of normal/reverse stitching .................................................................................. 40
(20) Setting and Ajusting for SC-920.............................................................................................. 42
1) Setting procedure of the machine head .................................................................................. 42
2) Machine head list .................................................................................................................... 43
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