IMPORTANT SAFETY INSTRUCTIONS Putting sewing systems into operation is prohibited until it has been ascertained that the sewing systems in which these sewing machines will be built into, have confirmed with the safety regulations in your country. Technical service for those sewing systems is also prohibited. 1. Observe the basic safety measures, including, but not limited to the following ones, whenever you use the machine. 2.
FOR SAFE OPERATION 1.Don't put your hand under the needle when you turn "on" the power switch or operate the machine. 2.Don't put your hand into the thread take-up cover while the machine is running. 3.Turn OFF the power switch before tilting the machine head or removing the belt cover and the V belt. 4.Never bring your fingers, hair or clothing close to, or place anything on the handwheel, V-belt, bobbin winder wheel or motor during operation. 5.
1. SPECIFICATIONS 251-140040 Application 251-140040 A For medium-weight materials 251-140040 H For light-weight materials For heavy-weight materials Sewing speed Max. 5,000 rpm Max. 4,000 rpm Max. 4,000 rpm Stitch length Max. 5 mm Max. 4 mm Max. 5 mm Needle DBx1#9to#18(134#65to#llO) Presser foot lift (by knee lifter) 10 mm (Standard)13 mm (Max.) Lubricating oil Noise DBx1#9to#11(134#65to#75) DBx1#20to#23(134#125to#160) 9 mm (Max.) 10 mm (Standard) 13 mm (Max.
3. INSTALLING THE BELT COVER WARNING: To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be sure that the motor has totally stopped rotating in prior. 4. ADJUSTING THE HEIGHT OF THE KNEE LIFTER WARNING: To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be sure that the motor has totally stopped rotating in prior.
5. INSTALLING THE THREAD STAND 6. LUBRICATION WARNING: To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be sure that the motor has totally stopped rotating in prior.
7. ADJUSTING THE AMOUNT OF OIL ( OIL SPLASHES ) IN THE HOOK WARNING: Be extremely careful about the operation of the machine since the amount of oil has to be checked by turning the hook at a high speed. carrying out the procedure described below in 2, remove the slide plate and take extreme * When caution not to allow your fingers to come in contact with the hook. 1) If the machine has not been sufficiently warmed up for operation, make the machine run idle for approximately three minutes.
ยท Adjusting the amount of oil ( oil spots ) in the hook 1) Turning the oil amount adjustment screw attached on the hook driving shaft front bushing in the "+" direction (in direction A ) will increase the amount of oil (oil spots) in the hook, or in the "-" d irection (in direction B ) will decrease it. 2) After the amount of oil in the hook has been properly adjusted with the oil amount adjustment screw, make the sewing machine run idle for approximately 30 seconds to check the amount of oil in the hook.
11. Presser foot pressure 12. HAND LIFTER 13. ADJUSTING THE HEIGHT OF THE PRESSER BAR WARNING: To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be sure that the motor has totally stopped rotating in prior. 1) Loosen setscrew 1 , and adjust the presser bar height or the angle of the presser foot. 2) After adjustment, securely tighten the setscrew 1 . 14.
15. THREAD TENSION (1) Adjusting the needle thread tension 1) As you turn thread tension nut 1 clockwise (in direction A ), the needle thread tension will be increased. 2) As you turn nut 1 counterclockwise (in direction B ), the needle thread tension will be decreased. (2) Adjusting the bobbin thread tension 1) As you turn tension adjust screw 2 clockwise (in direction C ), the bobbin thread tension will be increased.
18. NEEDLE-TO-HOOK RELATIONSHIP WARNING: To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be sure that the motor has totally stopped rotating in prior. (1) Adjust the timing between the needle and the hook as follows : 1)Turn the handwheel to bright the needle bar down to the lowest point of its stroke, and loosen setscrew 1 .
20. TILT OF THE FEED DOG WARNING: To avoid possible personal injury due to abrupt start of the machine, turn off the power to the machine and check to be sure that the motor has totally stopped rotating in prior. 1) The standard tilt (horizontal) of the feed dog is obtained when marker dot A on the feed bar shaft is aligned with marker dot B on feed rocker 1 . (251-140040H, the marker dot B inclines forward the feed rocker shaft by 90 , as standard).
22. MOTOR PULLEYS AND BELTS 1) A clutch motor with 400W output (1/2 HP) is used as the standard motor 2) An M-type V belt should be used. 3) The relationship between the motor pulleys, belt lengths and sewing speeds is shown in the following table: Motor pulley O.D. Motor pulley part No.
Cut the table referring to the diagram.
