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Table of Contents
Related Manuals for JUKI MF-7524
Summary of Contents for JUKI MF-7524
- Page 1 MF-7524 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 ..................... 5 3. Installing the motor ..........................5 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 (L... -
Page 4: Ⅱ . Configuration Of The Machine Components
Ⅱ . CONFIGURATION OF THE MACHINE COMPONENTS ❺ ❼ ❸ ❹ 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 DRAWING OF TABLE (SEMI-SUBMERGED TYPE) – 4 –...
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Page 7: Selecting The Motor Pulley And The Belt
2. Selecting the motor pulley and the belt Motor pulley and belt * The table shows the numbers Sewing 50Hz 60Hz speed when a 3-phase 2-pole 400 W Pulley size Belt size Pulley size Belt size (sti/min) clutch motor (1 / 2 HP) is used. 2,000 ø... -
Page 8: Setting The Belt
4. Setting the belt WARNING : When replacing the belt, be sure to turn OFF the power to the motor and ascertain that the motor has totally stopped rotating before starting the work. There is a danger of injury since hands or clothes may be caught in the belt. -
Page 9: Installing The Thread Guide
7. Installing the thread guide 1) Install thread guide No. 1 ❶ supplied as accessories ❶ on the machine arm with screws (black, screw shank length 6 mm) ❷. 2) Install thread guide ❸ on thread guide No. 1 ❶ with ❷... -
Page 10: Ⅳ . Lubrication And 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 – 8 –... -
Page 11: Silicon Oil Lubricating Unit
3. Silicon oil lubricating unit This sewing machine is provided with the silicon oil ❷ lubricating unit as standard.In case of sewing at a high speed, or using chemical thread or chemical fabric, use the silicon oil lubricating unit to prevent thread breakage or stitch skipping. -
Page 12: Ⅴ . Operation
Ⅴ . OPERATION 1. Needle The needle used for this sewing machine is Japan No. SM1014B. German No. 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 following work after turning the power off and ascertaining that the motor is at rest. -
Page 13: 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 14: 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 15: Adjusting The Differential Feed Ratio
5. Adjusting the differential feed ratio Loosen differential lock nut ❶ and move lever ❷ up to increase the differential feed ratio. Then the sewn material is gathered. Move lever ❷ down to decrease the differential feed ratio. ❸ The differential feed ratio becomes 1 : 1 at the position where the pointer of lever ❷... -
Page 16: Adjusting The Thread Tension
7. Adjusting the thread tension Adjust the thread tension with the following thread tension nuts. ❶ Needle thread tension nut ❷ Top covering thread tension nut ❶ ❸ Looper thread tension nut Turn clockwise to increase the thread tension. Decrease Increase Turn counterclockwise to decrease the thread tension. -
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 following work after turning the power off and ascertaining that the motor is at rest. 1) Loosen setscrews ❶, adjust so that 12 mm is given (38 mm) from the center of the upper screw to the top surface... -
Page 18: Adjusting The Rocking Thread Take-Up
2. 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 following work after turning the power off and ascertaining that the motor is at rest. 1) Loosen setscrews ❶, move rocking thread take-up ❷... -
Page 19: Adjusting The Rocking Thread Take-Up Thread Receiver
3. Adjusting the rocking thread take-up thread receiver 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. 1) Loosen four setscrews ❶... -
Page 20: Adjusting The Rocking Thread Take-Up Thread Receiver
4. Adjusting the spreader thread guide 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. Adjust so that the top end of thread guide thread path (rear) ❸... -
Page 21: 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 following work after turning the power off and ascertaining that the motor is at rest. When the thread drawing amount is desired to be decreased in case of 2-needle machine or the like, loosen screws ❸, move upward thread guides ❶... -
Page 22: Adjusting The Looper
7. Adjusting the looper 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. [Lateral position] Clearance between looper ❶... -
Page 23: 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 following work after turning the power off and ascertaining that the motor is at rest. 1) Equally adjust clearance A between needles ❶... -
Page 24: Adjusting The Rear Needle Guard
9. Adjusting the rear needle guard 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. Adjust the lateral position of rear needle guard ❶... -
Page 25: 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 following 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 26: 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 following 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 27: Installing Position Of The Spreader
12. Installing position of the spreader 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. [Adjusting the height] The height of spreader ❶... -
Page 28: 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 following work after turning the power off and ascertaining that the motor is at rest. ❸... -
Page 29: 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 following 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 30: 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 following work after turning the power off and ascertaining that the motor is at rest. (1) Changing the feed driving movement The feed driving eccentric cam ❹... - Page 31 (2) Changing the feed rock movement Timing of the feed rock eccentric cam ❶ can be advanced from the standard adjustment by 10º. ❶ 1) Align screws ❷ and ❸ of feed rock eccentric cam ❶ with the holes in the rod. ❷...
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Page 32: Adjustment Of The Feed Dog In Longitudinal Direction
18. 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 following work after turning the power off and ascertaining that the motor is at rest. Longitudinal position of the feed dog 1) Position of the main feed dog It is the standard that the position where the... -
Page 33: 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. -
Page 34: Inspecting And Replacing The Oil Filter
3. Inspecting and replacing the oil filter 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. Normal lubrication cannot be performed if dust collects in oil filter ❶...