JUKI MF-7900 Instruction Manual
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- Engineer's manual (216 pages) ,
- Instruction manual (30 pages) ,
- Specification (8 pages)
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Table of Contents
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Summary of Contents for JUKI MF-7900
- Page 1 MF-7900(D)/UT55,56,57 INSTRUCTION MANUAL No.01 70002031...
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Page 2: Table Of Contents
coNTENTS !. SPEcIFIcaTIoNS ......................1 @. aT THE BEGINNING ......................1 #. INSTaLLING THE accESSorIES ................2 1. Installing the presser lifting cylinder .................... 2 2. Installing the air regulator ......................2 3. Installation and setting Sc-921 ...................... 3 (1) Installing the Sc-921 on the table ( Table-mount type ) ................3 (2) Installing the Sc-921 on the table ( Semi-submerged type ) ..............3 (3) connecting the cords ...........................4 (4) Setting procedure of the machine head .....................5... -
Page 3: Specifications
Looper mechansm Sphercal rod drve method Lubrcatng system Forced lubrcaton method by gear pump Lubrcatng ol JUKI GENUINE OIL 8 Ol reservor capacty Ol gauge lower lne : 600 cc to upper lne : 900 cc Installaton Table-mount type, Sem-submerged type... -
Page 4: Installing The Accessories
8 and cap 9 to obtan the correct clearance between the cap and lever. Adjust the heght of screw 5 referrng to the (^-14. adjusting Instructon Manual for MF-7900 1 to 2mm the presser foot lift), and tghten nut 6 . -
Page 5: Installation And Setting Sc-921
(1) Installing the Sc-921 on the table ( Table-mount type ) * The nstructons apply to the case the control box s nstalled on the table of the MF-7900(D). To use any other machne head, nstall the control box on the table referrng to the Instructon Manual for the man body of the relevant sewng machne. -
Page 6: Connecting The Cords
(3) connecting the cords Loosen screw B n cover 2 wth a screwdrver to open the cover. Pass cords 1 of the thread trmmng solenod, reverse-sttchng solenod, etc. and the cord from the motor through hole A n the table to route them down under the machne table. -
Page 7: Setting Procedure Of The Machine Head
LIST" on the separate sheet or the Instructon Manual for the machne head of your sewng machne for the type of the machne head. Type of machne head Model name MF-7900/UT55 MF-7900/UT56 MF-7900/UT57 MF-7900D/UT55 F79d MF-7900D/UT56 MF-7900D/UT57 After selectng the type of machne... -
Page 8: Setting The Lower Stop Position Of The Needle Bar
(5) Setting the lower stop position of the needle bar Call functon settng No. 22. Check to be sure that the lower stop poston of the needle bar s as shown n Fig. 1. If not, adjust the lower stop poston of the needle bar properly usng functon settng No. -
Page 9: Air Piping Drawing
$. aIr PIPING DraWING WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor. -
Page 10: Piping Of The Thread Trimmer Device (Ut55)
2. Piping of the thread trimmer device (UT55) – 8 –... -
Page 11: Piping Drawing For Air Blow (Ut56)
3. Piping drawing for air blow (UT56) 4. adjusting the air regulator Insert the ar hose to ar regulator 1 . Use the ar pressure at 0.4 to 0.5 MPa (4 to 5 kgf/ Draw up regulator knob 2 , turn knob 2 and adjust the ponter to 0.4 to 0.5 MPa to adjust the ar air hose pressure. -
Page 12: Threading The Machine Head
Thread the machne head accordng to the followng threadng llustratons. * For the adjustment procedure other than the above, refer to the Instruction Manual for MF-7900. When the small thread tension in the face plate is used for the machine with the thread trimmer device, the length of remaining needle thread after thread trimming becomes short and slip-off of thread at the start of sewing may occur. -
Page 13: Adjusting The Looper Thread Trimmer Mechanism
^. aDjUSTING THE LooPEr THrEaD TrIMMEr MEcHaNISM WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor. -
Page 14: Adjusting The Lower Knife
2. adjusting the Lower knife ) Set lower knfe 4 and lower knfe holder 5 wth setscrews 6 at the poston of the llustraton. 3. adjusting the position of clamp adjusting the position of clamp pressure adjusting spring ) Loosen screws 9 . 2) Adjust so that a clearance of 2.5 ±... -
Page 15: Initial Position Of The Looper Thread Trimmer Mechanism
6. Initial position of the looper thread trimmer mechanism When lower knfe knfe 4 s located at ts leftmost poston, the top end of the lower knfe knfe 4 has to be spaced 22 ± 0.5 mm from the center of needle bar. center of needle 7. -
Page 16: Adjusting The Longitudinal Position Of The Blade Point Of Lower Knife
10. adjusting the longitudinal Blade point of lower knife is in the center of thickness of looper. position of the blade point of lower knife Brng the needle bar to ts hghest poston. Adjust so that the blade pont of lower knfe 4 s n the center of the thckness of looper !3 when the clearance between the rght-hand edge of looper 9 mm... -
Page 17: Adjusting The Thread Release Mechanism
&. aDjUSTING THE THrEaD rELEaSE MEcHaNISM WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor. -
Page 18: Adjusting The Top Covering Thread Trimmer Mechanism
*. aDjUSTING THE ToP covErING THrEaD TrIMMEr MEcHaNISM WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor. -
Page 19: Adjusting The Speed Of Moving Knife
4. adjusting the speed of moving knife Stroke of ar cylnder 1 s 20 mm. Speed of the movng knfe can be changed wth speed controllers 2 and 3 . ) When you desre to change the protrudng speed of movng knfe, loosen the nut of speed controller 2 and turn the adjustment screw. -
Page 20: (. Adjusting The Air-Blow Wiper (Ut56)
(. aDjUSTING THE aIr-BLoW WIPEr (UT56) WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor. -
Page 21: Adjusting The Needle Thread Wiper (Ut55)
). aDjUSTING THE NEEDLE THrEaD WIPEr (UT55) WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor. -
Page 22: . Maintenance
_. MaINTENaNcE WarNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor.