Table of Contents
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Table of Contents
Related Manuals for JUKI MF-7523
Summary of Contents for JUKI MF-7523
- Page 1 ENGLISH MF-7500 INSTRUCTION MANUAL...
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Page 2: Table Of Contents
CONTENTS Ⅰ . SPECIFICATIONS ......................1 Ⅱ . CONFIGURATION OF THE MACHINE COMPONENTS ..........2 Ⅲ . INSTALLATION ........................3 1. Installing the machine head onto the table ................3 2. Selecting the motor pulley and the belt..................7 3. Installing the motor ........................7 4. -
Page 3: Ⅰ . Specifications
Looper mechanism Spherical rod drive method Lubricating system Forced lubrication method by gear pump Lubricating oil JUKI GENUINE OIL 18 Oil reservoir capacity Oil gauge lower line : 600 cc to upper line : 900 cc Installation Semi-submerged type - Equivalent continuous emission sound pressure level ( ) at the workstation : A-weighted value of 76.5 dB;... -
Page 4: Ⅱ . Configuration Of The Machine Components
Ⅱ . CONFIGURATION OF THE MACHINE COMPONENTS ❺ ❸ ❹ ❼ ❻ ❷ ❶ ❽ ❾ 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... -
Page 5: Ⅲ . Installation
Ⅲ . INSTALLATION WARNING : Do not insert the power plug of the motor into the receptacle until all works have been completed. There is a danger of injury by being caught in the machine. 1. Installing the machine head onto the table WARNING : The weight of the sewing machine is more than 46 kg. - Page 6 ■ 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) ❷ 13155403 Dust-proof rubber (Black) ❷ ❶ ❷ [For the direct-drive type] Part No.
- Page 7 DRAWING OF TABLE (SEMI-SUBMERGED TYPE) For the V-belt type – 5 – – 5 – ‒ 5 ‒...
- Page 8 DRAWING OF TABLE (SEMI-SUBMERGED TYPE) For the direct-drive type – 6 – – 6 – ‒ 6 ‒...
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Page 9: Selecting The Motor Pulley And The Belt
2. Selecting the motor pulley and the belt Motor pulley and belt * The table shows the numbers when a 3-phase Speed of 50Hz 60Hz stitch 2-pole 400 W clutch motor (1 / 2 HP) is used. Pulley size Belt size Pulley size Belt size (sti/min) -
Page 10: Installing The Belt Cover
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. ❸... -
Page 11: Installing The Needle Bar Thread Take-Up Cover
Be sure to supply lubricating oil before using the sewing Lubrication 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. -
Page 12: Oiling
When you operate the sewing machine for the first time or after an extended period of disuse, be sure to apply 2 to 3 drops of lubricating oil to needle bar ❹ . For the lubricating oil, use JUKI GENUINE OIL 18. ❹ 3. Silicon oil lubricating unit This sewing machine is provided with the silicon oil lubricating ❷... -
Page 13: Ⅴ . Operation
Ⅴ . OPERATION 1. Needle The needle used for this sewing machine is UY128GAS. Japan No. For the needle No., select a proper needle in accordance with German No. 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. -
Page 14: Threading The Machine Head
3. Threading the machine head 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. -
Page 15: Adjusting The Stitch Length
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. -
Page 16: Adjusting The Presser Foot Pressure
6. Adjusting the presser foot pressure 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 ❶ spring regulator ❶ and turn presser spring regulator ❶ . After the adjustment, tighten lock nut ❷... -
Page 17: Ⅵ . Adjusting The Sewing Machine
Ⅵ . ADJUSTING THE SEWING MACHINE 1. Adjusting the silicon container thread guide 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. 29 mm ❶... -
Page 18: Adjusting The Rocking Thread Take-Up
3. Adjusting the rocking thread take-up 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) Loosen setscrews ❶... -
Page 19: Adjusting The Looper Thread Cam Eyelet
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... -
Page 20: Adjusting The Height Of The Needle
8. Adjusting the height of 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. ❹... -
Page 21: Relation Between The Rocking Thread Take-Up Timing And The Needle Thread Loop
10. Relation between the rocking thread take-up timing and the needle thread loop 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. In the case stitch skipping or thread breakage occurs because the needle thread loop is too large or too small, change the needle thread feeding timing of the rocking thread take-up to adjust the size of the needle thread loop. -
Page 22: Adjusting The Height Of The Feed Dog
11. Adjusting the height of the feed dog 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. Adjust the height from the top surface of throat plate ❶... -
Page 23: Adjusting The Spreader Thread Guide And The Needle Clamp Thread Guide
13. Adjusting the spreader thread guide and the needle clamp thread guide 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. [Spreader thread guide] ❸... -
Page 24: Adjusting The Presser Foot Lift
15. Adjusting the presser foot lift 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. To adjust the height of the presser foot, adjust the height of screw ❶... -
Page 25: Adjusting The Feed Locus
17. Adjusting the feed locus 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) Changing the feed driving movement Timing of the feed driving eccentric cam can be retarded ❶... -
Page 26: Changing The Feed Rock Movement
(2) Changing the feed rock movement Timing of the feed rock eccentric cam ❶ can be retarded from the standard adjustment by 10°. ❶ 1) Align screws ❷ and ❸ of feed rock eccentric cam ❶ with the holes in the rod. ❷... -
Page 27: Adjustment Value Of Balloon
18. Adjustment value of balloon WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. When performing balloon stitch, carry out the adjustment referring to the adjustment values described below. - Page 28 ③ Hauling amount of the looper thread cam The lowermost position of the screw within the slot in thread guide (Standard: The upper marker line aligns with the lower The right and left thread end face of the thread guide) guide thread paths are same in height.
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Page 29: Adjustment Of The Feed Dog In Longitudinal Direction
19. Adjustment of the feed dog in longitudinal direction WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol- lowing work after turning the power off and ascertaining that the motor is at rest. (1) Longitudinal position of the feed dog 1) Position of the main feed dog It is the standard that the position where the clearance... -
Page 30: For C11
(2) For C11 Front and rear positions of the feed dog When the main feed dog has a pitch of 3.6 mm, the clearance between the most advanced posi- tion of feed (worker side) and the throat plate shall be 0.6 ± 0.2 mm. When the differential feed dog has a pitch of 2.5 mm and the differential feed ratio is 1:1 at that time, the clearance between the main feed dog... -
Page 31: Ⅶ . Maintenance
In case of the new sewing machine, replace the lubricating oil (JUKI GENUINE OIL 18) with new one after using it for approximately one month. Then replace the lubricating oil every six months.