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Related Manuals for JUKI MOL-254N
Summary of Contents for JUKI MOL-254N
- Page 1 MOL-254N INSTRUCTION MANUAL...
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Page 2: Table Of Contents
CONTENTS I. SPECIFICATIONS ......................1 1. Machine head specifications.......................1 II. NAMES AND FUNCTIONS OF COMPONENTS ............. 3 III. INSTALLATION ....................... 4 1. Fixing the table stand ........................4 2. Installing the thread stand ......................4 3. Air adjustment ..........................5 4. Removing the head fixing bolt ....................5 5. - Page 3 (8) Fullness setting ......................... 23 (9) Setting of the belt loop splice detection ..................24 (10) Setting of the belt loop detection ....................24 (11) Setting the loop length ......................25 (12) Setting the folding length (on the loop grasping side) ............... 25 (13) Setting the folding length (on the cutter side) ................
- Page 4 (1) Changing the knife position ...................... 42 (2) Changing the DIP switch......................42 7. Replacing the loop folding shaft ....................43 8. Draining ............................44 9. Adjustment of the height of the needle bar ................45 10. Adjusting the needle-to-hook timing ..................45 11. Thread take-up spring ......................47 (3) Adjusting the stroke of the thread take-up spring, front side ............
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Page 5: Specifications
I. SPECIFICATIONS 1. Machine head specifications Max. sewing speed 2,500sti/min (sewing pitch : 3.4 mm or less) Hook Horizontal semi-rotary hook (oil wick lubrication) Bobbin 1.8 fold hook Thread take-up Link-type thread take-up lever DP×17 #19 to #21 Needle For domestic : DP×17 #19 For export : DP×17 #21 Range of thread specifica- Cotton thread #30 to #50, spun thread #30 to #50... - Page 6 30 Loop cut Cutting method by engaging moving knife with counter knife 31 Loop bending Fork rotating and bending type 32 Loop supply drive method Front and rear assisted drive method (stepping motor) 33 Loop length setting Automatic recognition method 34 Loop splice detection Potentiometer automatic splice detection method Bobbin thread winder de-...
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Page 7: Names And Functions Of Components
II. NAMES AND FUNCTIONS OF COMPONENTS Temporary stop switch Operation box panel <P.16> The switch is used to temporarily stop the The panel is used to specify/display/actuate machine operation. functions. Sewing machine head Clamp feed device The machine head performs The device is used to sewing while making the assist in loop feeding. -
Page 8: Installation
III. INSTALLATION 1. Fixing the table stand WARNING 1. To prevent an accident resulting in injury or death, move the machine first to a horizontal and stable place. Then, lower adjuster bolts ❷ (at four locations) located at the side of casters ❶ to secure the machine. 2. If you want to increase the height of the table stand, loosen fixing bolts ❸ and ❹ of the table stand and adjust the table stand height. If you want to lower the table stand, remove fixing bolt ❺... -
Page 9: Air Adjustment
3. Air adjustment Open air cock ❶ , pull up and turn air regulator knob ❷ , and adjust so that air pressure gauge ❸ indi- ❷ cates 0.5 MPa. Then push down the knob to fix it. * When closing air cock ❶ , air comes out. ❸... -
Page 10: Preparation
IV. PREPARATION 1. Lubrication WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. (1) Machine head Apply oil from oil lubricating inlet ❶ (2 places) to the ❶... -
Page 11: Crank Rod Lubricating Plate
(3) Crank rod lubricating plate Remove the arm cover and apply oil to the crank rod lubricating plate ❶ . ❶ Be sure to apply oil when operating the sewing machine again after an extended period of disuse. (4) Main shaft front bushing portion Apply oil to the main shaft front bushing portion. -
Page 12: Loop Supplying Device
(5) Loop supplying device WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Lubrication method ❷ ❷ Loosen cover setscrew ❷ and remove cover ❶ , and apply oil to all the lubricating locations painted in yellow (marked with a thick arrow). -
Page 13: Passing A Belt Loop
2. Passing a belt loop WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 1) Pass a belt through belt loop guides B, C, and D in the written order. 2) Pass the belt loop through adjust binder ❶... -
Page 14: Attaching The Needle
3. Attaching the needle WARNING Turn the power switch OFF before starting the work. 1) Loosen setscrews ❶ . ❸ ❸ ❸ ❸ 2) Insert needles ❷ fully into the hole in needle ❶ ❶ fitting base ❸ until the end of hole is reached. At this time, set scarf ❹... -
Page 15: Setting The Bobbin Case
4. Setting the bobbin case WARNING Turn the power switch OFF before starting the work. The hook base on this side moves when the power switch is turned ON. So, be careful not to allow your hand or the like to be caught in the hook base. 1) Press the bobbin replacement switch on the panel and widen the center-to-center distance... -
Page 16: Setting The Bobbin Into The Bobbin Case
6. Setting the bobbin into the bobbin case 1) Hold bobbin ❶ so that thread is “left twist” (Z-twist), and set the bobbin into bobbin case ❷ . 2) Pass the thread through thread slit ❸ in bobbin ❺ case ❷ , and continue pulling the thread. By ❹... -
Page 17: Threading The Machine Head
7. Threading the machine head WARNING When threading the machine head, lower the cloth presser foot by pressing "Threading" switch on the operation box or turn OFF the power switch. Power switch Threading switch Thread the machine head as shown in the illustration given above. –... -
Page 18: Adjusting The Thread Tension
8. Adjusting the thread tension (1) Adjusting the needle thread tension As you turn thread tension No. 2 knob ❶ clockwise, the needle thread tension will be increased, and as ❸ you turn it counterclockwise, the needle thread ten- sion will be decreased. (2) Adjusting the bobbin thread tension ❶... -
Page 19: Basic Operation Flow Chart
V. Basic operation flow chart 1. Basic performance Basic performance Temporary stop Turn ON the power switch. Alarm indication is displayed. Turn ON the temporary stop switch. Operation corresponding to Error check return of alarm. Alarm indication for temporary Error is not found. stop procedure is displayed. -
Page 20: Operation
VI. Operation 1. Names and functions of operation box panel ❶ ❾ ❷ ❽ ❻ ❼ ❺ ❸ ❹ Name of switch Function ❶ Set ready switch When this switch is pressed, the sewing machine enters the sewing stand-by state, and the display screen changes over to the sewing screen. - Page 21 Name of switch Function ❸ Counter key This key is used to enter the counter setting screen. (Refer to "VI-2. Explanation of the counter" P.19.) ❹ Standard screen key a. This key is used to enter the setting screen. b. When changing the sewing data, keep pressing this key for 10 seconds to release data-lock, In addition, data is locked when keeping pressing this key again.
- Page 22 Name of switch Function Left cursor key a. This key scrolls setting item to the left when displaying setting screen or the like. b. This key performs presser foot jump feed operation (traveling backward) when displaying the sewing screen. (Refer to "VI-3.
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Page 23: Explanation Of The Counter
2. Explanation of the counter Count operation means that number of times of sewing is added or subtracted when sewing is completed while one loop is regarded as "1". When the number of times of sewing reaches the specified value, the sewing machine automatically stops, and the hook on front side widens to front side. -
Page 24: Confirmation Of Needle Entry Point
Count UP screen When the counter is in the state of count-up after sewing, the following screen is displayed. * When setting 1st hook and 2nd hook individually, the part only to which count-up is performed is dis- played. Count-up screen * Be sure to use the counter since the moving mechanism is provided on front side (1st hook). -
Page 25: Setting Screen
4. Setting screen Internal pattern data No. (In case of external ROM data, "E01A" is displayed.) List of display Setting of sewing data is performed. The screen is displayed by pressing the program key. When you desire to change the set value, keep pressing the standard screen key for 10 seconds. -
Page 26: Setting Of Max. Number Of Rotations
(2) Setting of max. number of rotations (Setting range : 500 to 2,500 sti/min) Input with the ten keys. (3) Setting of number of stitches Sewing pattern should be selected from among 28-stitch, 36-stitch and 42-stitch patterns built in system ROM. (4) Setting of bartacking length (Setting range : 7.0 to 22.0 mm) (5) Setting of bartacking width... -
Page 27: Fine Adjustment Of Bartacking Position
(7) Fine adjustment of bartacking position Sewing position may slightly move when a loop is changed to the other loop of different width or to the other loop of different material. Use this setting when compensating the correction amount at this time. Moves to the right as much as the set value. -
Page 28: Setting Of The Belt Loop Splice Detection
1) Max. loosening amount Space between needles A Loosening amount is the amount C which has cut B. Operate the machine referring to the following table. Space between Loosening needles A amount C 43 to 45 mm 7 mm 46 to 50 mm 8 mm 51 to 55 mm 9 mm... -
Page 29: Setting The Loop Length
(11) Setting the loop length (Setting range : 50.0 to 80.0 mm) Input the length of the loop after its both ends have been folded. * If the DIP switch SW7 located on the upper side of the side face of the panel is set to OFF, this pictograph will not be displayed. -
Page 30: Adjustment Screen
5. Adjustment screen List of display Pressing the standard screen key , press ten key "0", and adjustment screen is displayed. At this time, when the No. 2 of the upper stage DIP switches located on the right side face of the operation box panel is set to: OFF : Display only ON : Setting is possible. -
Page 31: Belt Feeding Amount
(3) Belt feeding amount Setting of the length when belt loop is picked out (unit : mm) Folding amount of belt loop in the rear side changes. The longer the belt loop is picked out, the more the folding amount increases. The value and the value of folding length are not the same since there is a difference in mechanical adjustment value. -
Page 32: Setting Of Wiper Operating Time (Unit : Sec)
(6) Setting of wiper operating time (Unit : sec) Setting of wiper operating time is performed. (Unit : sec.) Change the operating time when the operating time is short and thread cannot be wiped. Input the change with the ten key. (Standard setting : 0.06) (7) X-axis origin compensation of the sewing machine presser (unit : mm) This adjustment is performed when the position of the presser and needle is shifted due to unexpected accident or the like. -
Page 33: Setting Of Thread Presser Operation
A sheet on which the adjustment values peculiar to this machine are described is enclosed with this machine. Keep the sheet with care. If the replacement of the circuit board should occur due to the trouble, re-entry is necessary. Take a memo when changing the value of <BG>, <BH>, or <BI>. MOL-254N Adjustment Sheet MOL Mfg.No... -
Page 34: Setting Of Dip Switches
6. Setting of DIP switches DIP switches can be set when removing cover ❶ located on the right side face of the operation box. ❶ Upper side of side face Name (function) of mode Standard setting Description Expansion of setting range When the switch is set to ON, limitation item is ineffective. -
Page 35: Operation
7. Operation WARNING Operate the machine after you thoroughly understand a series of procedure steps referring to the basic operation flow chart. (Refer to "V-1. Basic performance" P.15.) Operate the machine following the steps of proce- dure described below. 1) Turn ON the power switch. (Turn ON switch ❶ .) 2) Set a garment body to be sewn on the machine. -
Page 36: Maintenance
VII. MAINTENANCE 1. Changing the center-to-center distance between bartacks The center-to-center length between the needles can be adjusted between 43 mm to 70 mm. (1) Changing the needle gauge 1) Loosen needle base setscrew ❶ from the rear ❷ ❷ ❶... -
Page 37: Changing The Fork
(3) Changing the fork 1) Loosen cover setscrews ❶ to remove the cover. ❶ ❶ 2) Loosen setscrews ❷ . Move the near-side fork (indication mark ❸ ) to align it with scale ❹ (loop length). Then, tighten setscrews ❷ . * At this time, the fork and the needle are at the position where their centers are aligned. -
Page 38: Adjusting The 1St Hook Position
(5) Adjusting the 1st hook position 1) Turn ON the power. When the data is locked, keep pressing the stan- dard screen key for 10 seconds to release the data lock key. 2) Simultaneously press key and "0" key, and the setting mode screen appears. -
Page 39: Adjusting The Wiper
(6) Adjusting the wiper In case of front side (in the state where the ma- chine stops) ❶ 1) Loosen two setscrews ❶ and wiper base A ❷ moves in the direction of arrow. ❷ 2) Adjust the position when moving the wiper by hand as shown in the illustration so that section A which catches thread comes in contact with thread and enters further than thread when it... -
Page 40: Moving The Loop Feeding Unit
(8) Moving the loop feeding unit Loosen screw ❶ and ❷ , move knife unit guide rail ❸ to align the engraved line to scale ❹ . ❹ ❶ ❷ ❸ (9) Changing the fullness unit Loosen setscrews ❹ . Move fullness lever ❶ to the right and left ( ) to position it almost at the cen- ter between loop receiver (front) ❷... -
Page 41: Adjusting The Width Of Belt Loops
2. Adjusting the width of belt loops (1) Changing the binder Loosen screws ❶ and adjust the position of loop width guide ❷ so that a clearance of 1 mm (as thick as the splice section) is provided between the belt loop and the binder. -
Page 42: Changing The Length Of Bartacking
(4) Changing the length of bartacking Change the 1D bartacking length data on the setting screen. (5) Changing the value of belt loop width Change the data of loop width of 1F in the setting screen. (6) Changing the loop guide 1) Move fork ❸... -
Page 43: Replacing Loop Cut Moving Knife
3. Replacing loop cut moving knife WARNING Turn OFF the power and the air. Take care not to cut your fingers with moving knife ❺ during work. (1) Removing the moving knife Remove setscrews ❶ from the loop receiver, then ❻ ❻ ❼ ❼ remove loop receiver ❷ . Remove setscrew ❸ from the knife presser spring collar, then remove knife presser spring ❹... -
Page 44: Adjusting The Belt Loop Splice Detector
4. Adjusting the belt loop splice detector WARNING To secure safety, be sure to conduct adjustment while the Set ready LED goes out. This adjustment has to be carried out with the power switch ON. 1) Flashing to [1I] or [1J] in the setting screen, press key to enter the splice input screen. -
Page 45: Adjustment Of The Belt Loop Without Splice
5. Adjustment of the belt loop without splice 1) Flashing [1I] or [1J] in the setting screen, press key to enter the splice input screen. 2) Press the ten key [1]. ＊ Belt Loop ＊ level (0) Key [1] = level Adjustment Key [R] = Return 3) Set a belt loop and keep pressing the ten key [7] of the loop... -
Page 46: Changing The Straight Cutting
6. Changing the straight cutting (1) Changing the knife position 1) Stop the air supply. ❷ 2) Loosen setscrew ❷ in clamp collar ❶ . ❶ 3) Adjust so that the moving knife is at right angle against the loop. 90°... -
Page 47: Replacing The Loop Folding Shaft
7. Replacing the loop folding shaft WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❶ ❶ ❶ ❶ ❸ ❸ ❷ ❷ 1) Turn OFF the power switch and the air. 2) Loosen folding shaft presser spring setscrews ❶... -
Page 48: Draining
9) Adjusting the loop folding pressure Minimize the loop folding pressure as long as both ends of the loop to be used can be folded. ❼ ❼ [Adjustment] Turn the adjustment screw of loop-folding pres- sure reducing valve ❼ on the base plate coun- terclockwise to minimize the pressure. -
Page 49: Adjustment Of The Height Of The Needle Bar
9. Adjustment of the height of the needle bar WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. ❹ Upper ❸ engraved line ❷ ❷ ❶ ❶ A : Engraved line for DP×5 B : Engraved line for DP×17 Bring needle bar ❶... - Page 50 2) Loosen driver setscrew ❺ , open inner hook Rear side presser hooks ❻ to the right and left sides, and ❽ ❼ remove inner hook presser ❼ . At this time, be careful so as not to drop inner hook ❽ . ❻...
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Page 51: Thread Take-Up Spring
11. Thread take-up spring WARNING Turn the power switch OFF before starting the work. (1) Adjusting thread take-up spring A (front side) 1) Loosen screw ❶ . 2) Turn knob ❷ clockwise to increase the pressure, and counterclockwise to decrease the pressure. 3) After the adjustment, tighten screw ❶... -
Page 52: Adjusting The Rising Amount Of The Thread Tension Disk
12. Adjusting the rising amount of the thread tension disk 1) Remove the arm cover and confirm that thread Widen release pin ❸ rides on thread release notch ❹ . 2) If the pin does not ride on the notch, press cam Narrow follower ❺... -
Page 53: Draining Waste Oil
2) Front side Loosen setscrew ❶ in the thread trimming arm and adjust by moving it in the direction of arrow. ❶ 3) Rear side Remove rubber cap ❷ located on the machine bed side and adjust by loosening setscrews ❸ in the thread trimming connection plate. -
Page 54: Cleaning The Air Filter
15. Cleaning the air filter WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Clean filter ❷ of the control box fan once every week. Temperature in the control box rises un- less the filter is cleaned. -
Page 55: Maintenance Screen
17. Maintenance screen Turn ON the upper DIP SW No. 2 located on the right side of the operation box panel, and pressing the stan- dard screen key , press ten key “1” to enter the adjustment screen. (1) [CA] Setting of starting angle of the 1st hook thread trimming cylinder drive Starting angle of the 1st hook thread trimming cylinder drive can be set. -
Page 56: [Ce] Setting Of The Machine Head X-Y Drive Timing
(5) [CE] Setting of the machine head X-Y drive timing Timing of the movement of needle and movement of machine head X-Y can be selected. Standard is 50°, and 30° and 70° can be selected. The angle to be set means the ending angle of the X-Y movement. The setting is changed depending on the problem whether needle pierces or needle comes off since the time of X-Y movement is the same. -
Page 57: [Ci] Setting Of Waiting Time When The Supply Slide Base Travels Backward To The End
(9) [CI] Setting of waiting time when the supply slide base travels backward to the end Standard setting time is 0.03s. The recommended value for the MOL-254N (Model setting: CO=01) is 0.1s. Length of time to wait for calming down of damping of the jumping movement when the folding shaft is changed over to up position by means of the change-over of cam. -
Page 58: [Cm] Setting Of The Machine Head Motor Stop Time
(15) [CO] Setting of the model 0 : MOL-254 1 : MOL-254N Carry out setting in accordance with the model of the sewing machine you use. If this setting does not match the model, the belt loop length will not be correct. -
Page 59: Disposal Of Batteries
18. Disposal of batteries A built-in battery is installed on the MAIN PCB in the electrical control box for backing up the memory when the power is OFF. Appropriately dispose of the battery pursuant to the laws and regulations of your country. [How to remove the battery] 1) Remove six setscrews ❶... - Page 60 3) ❷ is the MAIN PCB you have removed. ❷ ❷ 4) ❹ is the backup battery. ❹ ❹ Type : VL2020 5) Cut metal plate (D) that secures battery (A) with ❹ ❹ nippers or the like at position 6) Cut metal plate (C) that secures battery ❹...
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Page 61: Alarm List
VIII. ALARM LIST Alarm No. is displayed in the display screen of the operation panel when an alarm occurs. Item Description AL-01 Trouble M-axis motor driver Servomotor for the sewing machine is trouble. (Trouble SDC) Refer to the alarm list for SDC printed circuit board. AL-04 Trouble X-axis feed In case where pulse output is not completed within the specified... - Page 62 Item Description AL-51 Trouble signal at the travel- ing forward end of fork AL-52 Servo free for belt loop sup- plying device AL-53 Trouble movement of servo for belt loop supplying device AL-55 Occurrence of belt loop block AL-56 Trouble belt loop elimination This occurs when belt loop cut section of 200 mm or more is detected.
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Page 63: Phenomena, Causes And Corrective Measures Of Troubles In Sewing
IX. PHENOMENA, CAUSES AND CORRECTIVE MEASURES OF TROUBLES IN SEWING Phenomenon Cause Corrective measure ① Stitches skip at the start of sew- Thread slips off the Make a clearance of 0.05 to 0.1 mm needle eyelet at the ing. between needle and hook. start of sewing. - Page 64 Phenomenon Cause Corrective measure ① The last stitch skips. Thread cannot be cut. Adjust the needle-to-hook timing. ② Initial position of moving knife is Adjust initial position of the moving not proper. knife. ③ Counter knife is not sharp. Replace the counter knife with a new one.
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Page 65: Phenomena, Causes And Corrective Measures Of Trouble
X. PHENOMENA, CAUSES AND CORRECTIVE MEASURES OF TROUBLE Phenomenon Cause Corrective measure 1. Belt loops cannot be cut. 1. Moving knife fails to cut belt Grind the blade section of the loops sharp. moving knife or replace the mov- ing knife with a new one. 2. -
Page 66: Optional
Conduct the model setting (CO). short. (MOL-254) match the model setting. 12. Length of the belt-loop fed The feed mechanism does not Conduct the model setting (CO). is long. (MOL-254N) match the model setting. XI. OPTIONAL Name Function 1. Belt loop detector (40285831) The belt loop detector generates an alarm if loops are entan- gled and cannot be supplied as specified. -
Page 67: Optional Parts
XII. Optional parts 1. Tabletop mounting type bobbin thread winder Name Part number × Quantity ❶ 13870266 × 1 ❺ WP0501016SC × 4 Electric bobbin thread winder ❷ 13889951 × 1 ❻ M85066100A0× 1 ❹ SK3412001SE × 1 ❼ SL4040891SC × 1 [Installation method] ❹... - Page 68 [Winding the bobbin thread] 1) Insert bobbin ❶ into bobbin shaft ❷ . 2) Pass thread through thread guide ❽ , open ❾ thread tension disks ❾ , and enter the thread into the slit of thread tension post . ❼...
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Page 69: Under-Table Mounting Type Bobbin Thread Winder
2. Under-table mounting type bobbin thread winder Name Part number Bobbin thread winder (asm.) 40228356 [Installation method] Insert bobbin thread winder mounting rod ❶ into hole ❷ in the bobbin thread winder and secure with a nut. ❷ ❷ ❶ ❶ [Winding the bobbin thread] LED 1,2,3,4 1.
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