typical GT1790A, Instruction Book

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I. Important Safety Instructions
1) Never operate the sewing machine before adding lubricant into the oiling tank.
2) When operation is completed, please remove dust from the hook bobbin thread cutting knife and check
whether the lubricant is sufficient.
3) Be sure to return the activating pedal to the home position after the machine has started to run.
4) A detector is installed so that this sewing machine cannot be operated in the state that the machine head is
tilted. When operating the sewing machine, please turn on the power after correctly set the machine head on
the table.
II. Specifications
Main specifications for CSM-1790A Computer-controlled High-speed Lockstitch Buttonholing Machine
Subclass
Major
application
Buttonholes on button cloth such as shirts, blouses,
working uniforms, suit-dress.
Buttonhole size
1. Specifications
Sewing speed Standard speed: 3600sti/min (Max.: 4200sti/min) (In case of dry-type hook, max.:
3300sti/min)
Needle
DPX5 # 11J 〜 # 14J
Hook Full rotating hook, type DP
Needle rocking drive method Driving pulse motor
Needle feeding drive method Driving pulse motor
Presser lifting drive method Driving pulse motor
Lift of presser foot 14mm (set as required) Max.: 17mm (in case of backstitch)
Cloth cutting knife drive method Driving pulse motor
Number of standard sewing shapes 31 types
Number of memorized patterns 99
Power supply Single phase 200/220/230/240V, 370VA
Standard: Max. 5mm
Parts with special
specifications: Max. 10mm
Dimension of knife
6.4~31.8mm (1/4’~1-1/4’)
Buttonholing sewing length
Standard: Max. 41mm
Parts with special
specifications: Max. 120mm