JUKI MF-7523 Instruction Manual

Ⅱ . CONFIGURATION OF THE MACHINE COMPONENTS ..............................................2 Ⅲ . INSTALLATION ......................................................................................................................3 1. Installing the machine head onto the table .......................................... ...

– 1 – ‒ 1 ‒ Model name High-speed, flat-bed coverstitch machine Model MF-7500 series Stitch type ISO standard 406, 407, 602, and 605 Example of application Hemming and covering for knits and general knitted fabrics Sewing speed Max. 6,500 sti/min (at the time of intermittent operation) V-belt type 6,000 sti/min (at the time of intermittent operation) Direct-drive type Factory-set sewing speed at the time of shipment. 4,5 ...

– 2 – ‒ 2 ‒ Ⅱ . CONFIGURATION OF THE MACHINE COMPONENTS ❶ Presser spring regulator � Eye guard cover ❷ Needle bar thread take-up cover � Throat plate ❸ Oil circulation inspection windows � Needle tip silicon oil lubricating unit ❹ Oil hole cap � Differential lock nut ❺ Micro-lifter � Micro-adjustment knob ❻ Needle thread silicon oil lubricating unit � Finger guard ❼ Thread guide No. 1 � Rocking thread take-up ...

– 3 – ‒ 3 ‒ [For the V-belt type] Attach the supporting board and the rubber seats as shown in the illustration and properly install the sewing machine. ❶ Bolt ❷ Spacer ❸ Washer ❹ Spring washer ❺ Nut ❻ Supporting board ❼ Spring pin ❽ Rubber cushion (Black) × 3 ❾ Rubber cushion (Gray) × 1 1. Installing the machine head onto the table Semi-submerged type WARNING : Do not insert the power plug of the motor into the recep ...

– 4 – ‒ 4 ‒ Part No. Part name Q'ty ❶ 40072505 Dust-proof rubber (Gray) 1 ❷ 13155403 Dust-proof rubber (Black) 3 ■ Installing the rubber cushion Install the gray dust-proof rubber to section A only. [For the V-belt type] Part No. Part name Q'ty ❶ 40072505 Dust-proof rubber (Gray) 2 ❷ 13155403 Dust-proof rubber (Black) 2 [For the direct-drive type] ❶ A ❷ ❷ ❷ ❶ ...

– 5 – ‒ 5 ‒ DRAWING OF TABLE (SEMI-SUBMERGED TYPE) For the V-belt type A 4x ø 3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.) B 4x10.5 hole, depth 26, spot facing depth 3.5 C 2x ø 3.4 on the bottom surface, depth 10 (Drill a hole at the time of set-up.) D Drilled hole 17 E Installing position of drawer stopper (on the reverse side) Z-Z(4 locations) Y-Y(3 locations) X-X A B C D E ...

– 6 – ‒ 6 ‒ DRAWING OF TABLE (SEMI-SUBMERGED TYPE) For the direct-drive type A 4 x ø 3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.) B 4 x10.5 hole, depth 26, spot facing depth 3.5 C 2 x ø 3.4 on the bottom surface, depth 10 (Drill a hole at the time of set-up.) D Drilled hole 17 E Installing position of drawer stopper (on the reverse side) Z-Z(4 locations) B C D A E ...

– 7 – ‒ 7 ‒ 2. Selecting the motor pulley and the belt * The table shows the numbers when a 3-phase 2-pole 400 W clutch motor (1 / 2 HP) is used. * The commercially-available motor pulley near to the counted value is designated since the outside diameter of the commercially-available motor pulley counts by 5 mm. Use a motor pulley which is adaptable to this sewing machine. The sewing speed exceeds the max. sewing speed of this sewing mach ...

– 8 – ‒ 8 ‒ Install belt cover ❸ as shown in the illustration. ❶ and ❷ are the fixing screws for belt cover ❸ . 5. Installing the belt cover WARNING : Be sure to install the belt cover. If it is not installed, there is a danger of injury since hands or clothes may be caught in the machine or a danger of damage of the machine since sewing products may be caught in the machine. 1) Hang hook ❷ of chain ❶ to presser bar lifting le ...

– 9 – ‒ 9 ‒ Lubricating oil has been taken out at the time of delivery. Be sure to supply lubricating oil before using the sewing machine for the first time. • Oil used : JUKI GENUINE OIL 18 Do not use oil addition agent since deterio- ration of lubricating oil or machine trouble will be caused. To add oil, remove first the oil inlet cap ❷ indicated as "OIL". Then, add oil from the oi ...

– 10 – ‒ 10 ‒ 3. Silicon oil lubricating unit This sewing machine is provided with the silicon oil lubricating unit as standard.In case of sewing at a high speed, or using chemical thread or chemical fabric, use the silicon oil lubricat- ing unit to prevent thread breakage or stitch skipping. Oil used is silicon oil (dimethyl silicon). Open cover ❷ of silicon container ❶ and make sure that silicon oil enters needle thread, needle tip ...

– 11 – ‒ 11 ‒ Japan No. 9 10 11 12 14 German No. 65 70 75 80 90 1. Needle The needle used for this sewing machine is UY128GAS. For the needle No., select a proper needle in accordance with the sewing conditions. 2. Attaching the needle WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow- ing work after turning the power off and ascertaining that the motor is at rest. 1) Lo ...

– 12 – ‒ 12 ‒ WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow- ing work after turning the power off and ascertaining that the motor is at rest. If threading is wrong, stitch skipping, thread breakage, needle breakage or irregular stitches will be caused. So, be careful. 3. Threading the machine head When using more stretchable thread When covering thread is excessively ...

– 13 – ‒ 13 ‒ 4. Adjusting the stitch length WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow- ing work after turning the power off and ascertaining that the motor is at rest. The stitch length can be infinitely adjusted from 1.2 mm to 3.6 mm. * The actually sewn stitch length varies in accordance with kind and thickness of the materials. [How to change the stitch lengt ...

– 14 – ‒ 14 ‒ Decrease the presser foot pressure as low as possible to such an extent that stitches are stabilized. To adjust the pressure, loosen lock nut ❷ of presser spring regulator ❶ and turn presser spring regulator ❶ . After the adjustment, tighten lock nut ❷ . Turning it clockwise to increase the pressure. Turning it counterclockwise to decrease the pressure. 6. Adjusting the presser foot pressure 7. Adjusting the thread ...

– 15 – ‒ 15 ‒ Ⅵ . ADJUSTING THE SEWING MACHINE 1) Loosen setscrews ❶ and shift them to the lower- most position. Then, tighten setscrews ❶ . 2) Loosen setscrew ❷ . Move the needle thread guide bar to adjust so that a distance of 29 mm is provid- ed between its center and the center of screws ❶ . Then, fix the needle thread bar at that position with setscrew ❷ . 1. Adjusting the silicon container thread guide WARNING : To pr ...

– 16 – ‒ 16 ‒ 1) Loosen setscrews ❶ . Move rocking thread take-up lever ❷ to the right and left to adjust so that a distance of 83 mm is provided between the thread hole and the center of rocking thread take-up lever shaft ❸ . Then, tighten setscrews ❶ . 2) Adjust so that rocking thread take-up base ❹ is level when the rocking thread take-up is in its lowest position. Retighten screw ❺ to fix the rocking thread take-up base ...

– 17 – ‒ 17 ‒ 6. Adjusting the looper thread cam eyelet WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow- ing work after turning the power off and ascertaining that the motor is at rest. When the thread drawing amount is desired to be de- creased in case of 2-needle machine or the like, loosen screws ❸ , move upward thread guides ❶ and ❷ and tighten screws ❸ to ...

– 18 – ‒ 18 ‒ WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow- ing work after turning the power off and ascertaining that the motor is at rest. 1) Equally adjust clearance A between needles ❶ and needle holes ❷ in the throat plate. 2) Adjust the height of the needle bar so that the top end of the needle hole of left-hand needle aligns with the bottom end section of ...