JUKI LS-2342 Instruction Manual Download Page 23

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5-4. Normal-/reverse-feed stitch needle entry points alignment at the

time of automatic reverse feed stitching (LS-2342S-7, 2342H-7)

When the sewing speed or stitch pitch is changed, the normal- and reverse-feed stitch needle entry points may

not be aligned at the time of automatic reverse feed stitching.

In such a case, correct the alignment of needle entry points by changing the ON/OFF timing of the automatic re-

verse feed cylinder.

In the case the stitch pitch is large and correction of the timing is difficult, it is recommended to decrease the re

verse feed sewing speed or use the temporary stop function at each corner section of the sewing pattern.

Refer to

"III-8. Detailed explanation of selection of functions

⑯

Compensation of timing of the solenoid for

reverse feed stitching"

in the Instruction Manual for the SC-922 for detail.

Normal- and reverse-feed stitches may need to be adjusted according to the stitch pitch to be used. Refer to the

Engineer's Manual for how to adjust the stitches.

1) How to align needle entry points of the reverse feed stitching with those of the normal feed stitching

Carry out "correction of the timing of the reverse feed stitching" according to the difference between the needle

entry points of the reverse feed stitching and those of the normal feed stitching.

Refer to

"III-6. Setting the SC-922 functions"

in the Instruction Manual for the SC-922 for how to carry out

the "correction of the timing of the reverse feed stitching".

2) Stitch-by-stitch reverse feed stitching speed (Function setting No. 8)

Default value

Recommended value Recommended value

Stitch pitch (mm)

3 to 6

7 to 8

Reverse feed stitching speed (sti/min)

600

500

400

②

Correction of the OFF-timing of the re-

verse feed stitching at the beginning of
sewing (Function setting No. 52)

③

Correction of the OFF-timing of the re-

verse feed stitching at the end of sewing
(Function setting No. 53)

Sewing starting position

Stitch length

is smaller.

Decrease the set

value of No. 51.

Increase the set

value of No. 51.

Decrease the set

value of No. 52.

Increase the set

value of No. 52.

Stitch length is smaller.

Decrease the set

value of No. 53.

Increase the set

value of No. 53.

Stitch length is smaller.

Sewing end position

①

ON-timing of the reverse feed stitching at

the beginning of sewing (Function setting
No. 51)

Summary of Contents for LS-2342

Page 1: ...LS 2342 2342 7 INSTRUCTION MANUAL ...

Page 2: ...d take up spring 16 4 4 Adjusting the pressure of the presser foot 16 4 5 Needle to hook relation 17 4 6 Adjusting the hook needle guard 18 4 7 Adjusting the bobbin case opener 18 4 8 Position of the counter knife and adjustment of the knife pressure LS 2342S 7 2342H 7 19 4 9 Adjusting the amount of the alternating vertical movement of the walking foot and the presser foot 19 5 OPERATION OF THE SE...

Page 3: ...ternate vertical dial adjustment type 16 Hook Full rotary vertical axis 1 6 fold hook Latch type 17 Feed mechanism Elliptical feed 18 Top and bottom feed actuation mechanism Timing belt 19 Thread trimming method Cam driven scissors type 20 Lubrication Concentrated tank type oil wick lubrication partially by manual 21 Lubricating oil JUKI New Defrix Oil No 2 equivalent to ISO standard VG32 22 Tube ...

Page 4: ... adjustment type 16 Hook Full rotary vertical axis 1 6 fold hook Latch type 17 Feed mechanism Box feed 18 Top and bottom feed actuation mechanism Timing belt 19 Thread trimming method Cam driven scissors type 20 Lubrication Concentrated tank type oil wick lubrication partially by manual 21 Lubricating oil JUKI New Defrix Oil No 2 equivalent to ISO standard VG32 22 Tube diameter 72 mm 23 Space unde...

Page 5: ... holding pulley cover Do not hold the handwheel and the reverse feed lever 2 Do not put protruding articles such as the screw driver and the like at the location where the sewing machine is placed 1 Attach oil extractor onto the top surface of the machine table and fix it with setscrew and wash er 2 After fixing oil extractor screw drain container in the oil extractor 2 1 Attaching the drain conta...

Page 6: ...urther 5 Mount spacers supplied with the machine head on the frame 6 Install bracket on CP panel with screws supplied with the panel 7 Install bracket on spacer with screws sup plied with the machine head and washers sup plied with the panel Do not use the screws supplied the panel instead of screws supplied with the ma chine head Accessory screw supplied with the machine head Thread diameter M5 L...

Page 7: ...own to the undersurface If humidity is high water may leak from ø8 air tube for exhaust coming from the sewing machine 3 Adjusting the air pressure 1 The operating air pressure is 0 5 to 0 55 MPa Adjust the air pressure using air pressure regulating knob of the filter regulator 2 In the case fluid accumulation is observed in A sec tion of the filter regulator turn drain cock to drain the fluid Dec...

Page 8: ... 6 2 4 Installing the thread stand Assemble the thread stand set it up on the machine table using the installation hole in the table and tighten nut gently ...

Page 9: ...e arrowed sections when you operate the sewing machine for the first time after the purchase or after the machine has been left unused for an extended period of time 3 PREPARATION OF THE SEWING MACHINE WARNING 1 Do not connect the power plug until the lubrication has been completed so as to prevent accidents due to abrupt start of the sewing machine 2 To prevent the occurrence of an inflammation o...

Page 10: ... hook needle guard p 18 If there is no clearance the needle and the hook will be damaged 1 Lift latch of hook and take out the bobbin 2 Put the bobbin into the shaft in the hook correctly and release the latch Do not make the machine run idle with the bobbin bobbin thread The bobbin thread is caught in the hook As a result the hook may be damaged WARNING To protect against possible personal injury...

Page 11: ...he bobbin winder lever automatically releases the bobbin and the bobbin winder stops running 1 The bobbin thread winding amount is adjusted by loosening setscrew The bobbin thread winding amount is in creased by moving bobbin wider lever upward 2 If the thread comes off the thread tension controller wind the thread on the interme diate thread guide by one turn 1 This is the one touch type bobbin w...

Page 12: ... 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 LS 2342S H LS 2342S 7 2342H 7 Thread the machine head following the order as illustrated in the figure Pass thread through the right side of thread guide LS 2342S 7 2342H 7 ...

Page 13: ...ontents of the setting corresponding with the type of machine head 4 Turn the power OFF 1 Refer to 18 FUNCTION SETTING SWITCH in the Instruction Manual for the CP 180 and call the function setting No 95 2 The type of machine head can be selected by pressing switch Select the model of the machine head according to the table shown below Model Indication LS 2342S 7 LS2A LS 2342H 7 LS2B LS 2342S LS2C ...

Page 14: ...adjust ment work The value is the reference value 6 Turn the power OFF CP 18 When checking the adjustment result set Function setting No 90 Initial sewing machine movement function at 1 Initial operation Sewing machine stops with its needle up Then check whether or not marker dot is aligned with marker line If they are not aligned carry out the adjustment again After checking the adjustment result...

Page 15: ...chine turns in the reverse direction and stop with its needle up For the function setting procedure refer to 18 How to set the functions in the Instruction Manual for the CP 180 2 is displayed A in the indicator and the mode is changed over to the adjustment mode 3 Turn the handwheel by hand until the main shaft refer ence signal is detected At this time the degree of an angle from the main shaft ...

Page 16: ...se the switch and the machine will run in the normal feed direction 3 Changing over the stitching pitch LS 2342S 7 2342H 7 1 Press stitching pitch changeover switch to change over the stitch length to the one corresponding to the scale mark on the 2P feed adjusting dial The LED on the switch lights up 1 Set 2P feed adjusting dial at a value smaller than the value set by standard feed adjusting dia...

Page 17: ...e D to decrease it Apply the same tension to both of the thread tension No 2 3 Adjusting the bobbin thread tension Turn tension adjustment screw clockwise E to in crease the bobbin thread tension or counterclockwise F to decrease it 4 2 Thread tension 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 ...

Page 18: ...ly holds the material The adjustable range extends from 38 mm to 60 mm which represents the distance from the upper surface C of the arm to presser spring regulating dial The standard value at the time of shipment is 47 mm 4 3 Thread take up spring 4 4 Adjusting the pressure of the presser foot 2 When you want to change the tension of the thread take up spring To adjust the tension of thread take ...

Page 19: ...upport into close contact with the lower bevel gear tighten thrust support setscrew A mm LS 2342S H 0 to 0 05 LS 2342S 7 2342H 7 0 to 0 05 The operation panel could come in contact with the thread stand when tilting the machine head To protect the relevant parts from contact shift the thread stand to a position at which the thread stand does not interfere with the control panel To check the needle...

Page 20: ... bring bobbin case opener to its backward travel end 2 Turn inner hook in the direction of arrow B to allow stopper to come in contact with the slits in throat plate 3 Loosen bobbin case opener adjusting plate setscrew Move bobbin case opener adjusting plate in the direction of the arrow to adjust the clearance between the bobbin case opener and protruding section A of inner hook to dimension C C ...

Page 21: ...e knife pressure LS 2342S 7 2342H 7 5 t o 6 m m Position where the knife pressure starts to be developed Initial position Both top ends align with each other 1 Move the moving knife by hand to its forward travel end 2 Loosen setscrews in the counter knife and move the counter knife to the right or left to adjust the position 3 To adjust the knife pressure move the counter knife and adjust so that ...

Page 22: ...rection of the arrow This makes the presser foot rise 10 mm and stay at that position 5 1 Hand lifter 5 2 Resetting the safety clutch 5 OPERATION OF THE SEWING MACHINE 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 prohibit the adjustment of the fee...

Page 23: ...reverse feed stitching with those of the normal feed stitching Carry out correction of the timing of the reverse feed stitching according to the difference between the needle entry points of the reverse feed stitching and those of the normal feed stitching Refer to III 6 Setting the SC 922 functions in the Instruction Manual for the SC 922 for how to carry out the correction of the timing of the r...

Page 24: ...everse feed stitching has been specified the reverse stitching will not take place for once immediately after it is pressed Example 1 If this switch is pressed when no automatic reverse feed stitching has been specified the reverse feed stitching will take place once immediately after it is pressed Example 2 Example 1 In the case where both automatic reverse feed stitching for start and that for e...

Page 25: ...eed adjusting dial less than that of the standard feed adjusting dial Example Standard feed adjusting dial scale 9 2P feed adjusting dial scale 6 When this switch is pressed the stitch length is changed over from 9 to 6 and the lamp lights up OFF ON When this switch pressed again the stitch length returns from 6 to 9 and the lamp goes out Needle thread tension changeover switch When the switch is ...

Page 26: ...d to CN36 of the machine controller 2 Functions of the knee switch If knee switch is pressed the amount of the alter nating vertical movement of the walking foot and the presser foot will be maximized Same with the perfor mance carried out by pressing the alternating vertical movement amount change over switch on the machine head The knee lifter switch can also be used as the presser bar lifting l...

Page 27: ...7 Press switch and end the option input 8 Select End item using switch or switch 9 Press switch or switch and return to the function setting mode Function code Abbreviation Functional item Remarks 5 FL Presser lifter switch function Presser output will be ON while the switch is being pressed 31 ALFL Presser lifter alternate switch function Presser output will be ON or OFF each time the switch is p...

Page 28: ...ect the item of by switch 4 Select the displayed number by means of switch 5 Select the knee switch function by switch Refer to list 1 for the details of the functions 6 Fix the knee switch function by switch 7 The above function is fixed by switch 8 The option input is ended by switch 9 Select the item of by switch and return to the function setting mode The lamps will be on alternately CP 180 ...

Page 29: ...7 mm to 9 mm or less 3 or less 2 500 sti min 2 000 sti min More than 3 or 4 or less 2 200 sti min 2 000 sti min More than 4 or 5 or less 2 000 sti min 2 000 sti min More than 5 or 9 or less 1 800 sti min 1 800 sti min LS 2342S LS 2342S 7 Amount of alternate vertical movement of the walking foot and presser foot Stitch length 9 mm or less 3 or less 2 000 sti min More than 3 or 4 or less 1 600 sti m...

Page 30: ...ow The clearance provided between the top end of the needle eyelet and the blade point of hook is not correct Hook needle guard is not functional Improper type of needle is used Refer to 4 5 Needle to hook rela tion p 17 Tighten the presser spring regulator Refer to 4 5 Needle to hook rela tion p 17 Refer to 4 6 Adjusting the hook nee dle guard p 18 Replace the needle with one which is thick er th...

Page 31: ...mount of the bottom feed Refer to the Engineer s Manual for the adjustment procedure 10 One or two stitches skip at the beginning of sew ing in the case of starting sewing from the material edge Needle thread and bobbin thread fail to intertwine with each other Thread tension given by the tension con troller No 1 is too high Clamp spring pressure is excessively weak The position of counter knife i...

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