JUKI LK-1903BN Instruction Manual Download Page 4

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2. Model classification according to the button size

3. Shape of buttons

Shape of buttons

Applicable buttons

Non-applicable buttons

Thickness of button : 1.8 to 3.5 mm

Button of which edge is thin is likely not to be fed smoothly.

Remarks

Model

Button size classification
Outside diameter of applicable buttons (mm)

Length

Width

Thickness (mm)

Right

Left

Needle hole guide
Feed plate

LK-1903BN-311

For small-sized buttons

ø10 - ø15

0 - 3.5
0 - 3.5

2.2 Engraved mark

MAZ165070B0

MAZ165080B0

MAZ15501000
MAZ15502000

LK-1903BN-312

For medium-sized buttons

ø12 - ø18

0 - 4.5
0 - 4.5

2.7 Engraved mark

MAZ166070B0

MAZ166080B0

MAZ15601000
MAZ15602000

Sewing size (mm)

Button clamp jaw
lever

Part No.

Less than 1.2 mm

Button without recess on the surface

1.2 mm or more

1.8 –

3.5 mm

Summary of Contents for LK-1903BN

Page 1: ...LK 1903BN BR35 INSTRUCTION MANUAL ...

Page 2: ... 4 Adjusting the button clamp jaw lever 18 5 Adjusting the lifting amount of the button clamp 19 6 Adjustment of the pressure of the work clamp unit 20 7 Adjustment of the wiper 20 8 Adjustment of the wiper spring 20 9 Installing the save button bar accessory part 21 10 Adjustment of the button feeder unit control box 21 11 Detecting mechanism of the button feeder components and the adjustment 22 ...

Page 3: ...ng possible 11 Button feeding method Horizontal forced feed mechanism 12 Detection of a failure of feeding buttons Provided with two detectors One detector detects a button at the section where the button is cor rectly positioned Another detector checks whether the button is correctly inserted into the carrier pin 13 Driving source for the feeder DC motor 24 Vdc 14 Automatic button discharging fun...

Page 4: ...iameter of applicable buttons mm Length Width Thickness mm Right Left Needle hole guide Feed plate LK 1903BN 311 For small sized buttons ø10 ø15 0 3 5 0 3 5 2 2 Engraved mark MAZ165070B0 H MAZ165080B0 H MAZ15501000 MAZ15502000 LK 1903BN 312 For medium sized buttons ø12 ø18 0 4 5 0 4 5 2 7 Engraved mark MAZ166070B0 J MAZ166080B0 J MAZ15601000 MAZ15602000 Sewing size mm Button clamp jaw lever Part N...

Page 5: ...t Sewing machine head Buton feeder Thread stand Sewing machine Parts feeder controller For Europe Button feeder unit BR control box Power switch Sewing machine control box Foot pedal Spinner oscillating arm motor knob Button loader unit Table Button feeder unit BR control panel Power switch EU type ...

Page 6: ...lat place 2 After the installation be sure to fix the table and stand by locking the casters or adjusting the adjuster 3 When adjusting the height of the table perform the work by two persons or more so as not to drop the table Needle Needle thread Bobbin thread 60 80 50 60 40 60 60 60 DP x 17 14 WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start ...

Page 7: ...F the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine Thread the machine head in the order as shown in the above figure to Leave thread of approximate 4 cm after passing through the needle ...

Page 8: ...ttern or enlargement reduction of the sewing width make sure of the needle entry point If the needle extends outside the button hole or the sewing pattern extends outside the button clamp unit the needle interferes with the button hole or the button clamp unit during sewing resulting in the danger of the needle breakage or the like While checking the shape of the pattern do not depress the pedal u...

Page 9: ...3 10 10 4 12 12 5 36 6 6 6 37 8 8 7 10 10 8 12 12 9 38 6 6 10 39 8 8 11 10 10 12 40 6 6 13 41 8 8 14 10 10 15 42 6 6 16 43 8 8 17 10 10 Standard sewing size Y mm Pattern No Stitch shape Number of threads thread Standard sewing size X mm 18 44 6 19 45 8 20 10 3 4 0 21 12 22 16 23 46 6 24 10 0 3 4 25 12 26 47 6 6 27 10 10 28 48 6 6 29 10 10 30 49 5 5 5 31 8 8 8 32 50 5 5 5 33 8 8 8 2 9 2 5 3 4 3 4 3...

Page 10: ...ve operation modes 2 Independent sewing mode is excluded which can be selected using mode selector switch Alarm indicator lamp red MANUAL operation switch 3 Operation of the button feeder unit 1 Explanation of the button feeder unit control panel Function Lights up when the power switch is turned ON If it fails to light up check the power plug for secure connection and re turn ON the power switch ...

Page 11: ...umber desired to be sewn to the gear of index unit and let the machine perform button sewing 4 Prospective button feeding mode Under this mode the fine positioning completion sensor function is stopped and the machine performs fine positioning of a button in a predetermined period of time set by DEG SW 2 a Suited to buttons of which is 1 mm or more 5 Button discharging mode Under this mode buttons...

Page 12: ... tion on the unit Then the button clamp jaw levers move to the origin and go up A state that the sewing is possible 3 Press the manual operation switch on the button feeder unit control panel and supply the button clamp jaw levers with a button If the button is not supplied to the button clamp jaw levers press the manual operation switch again 4 When depressing the pedal to the first step the butt...

Page 13: ...starts running when the pedal is fully depressed Refer to the next page and beyond for the detailed description of the timing at which the button carrier moves after the operation of the sewing machine and the time during which the machine performs fine positioning of a button SW3 Adjustment mode This function is used to make each of the driving sources independently actuate in combination with th...

Page 14: ... Two different kinds of continuous sewing and point stitching such as sewing hip pocket can be performed alternately Standard specifications at the time of delivery Applicable to many different kinds of button Buttons are rarely locked in the button feeder Suited to a single type of button flat buttons Buttons are likely to be locked in the button feeder as compared with the aforementioned No 5 Di...

Page 15: ...arging function This function is also used to set the length of time during which the fine positioner operates when the prospective button feeding function is specified Note 8 Prospective button feeding function Use this function when sewing a button which has a recess on the surface the difference in height between the bottom of recess and edge is 1 mm or more When this function is used the fine ...

Page 16: ...d to be used exclusive for point stitching such as sewing hip pockets Automatic stitching mode Note 3 Normal operation function Provided with a sensor which detects completion of fine positioning of a button Automatic button discharging function Function of adjusting the length of time during which the button carrier operates Note 11 Function of adjusting the length of time during which the fine p...

Page 17: ... comes off the index unit the machine makes the button carrier actuate with no button once after the completion of sewing to allow the operator to remove the material from the machine with ease If when the automatic button discharging function works the predetermined length of time for fine positioning of a button has passed before a button is placed on the button carrier the shutter plate will be...

Page 18: ...may be damaged In addition be careful not to allow your fingers to be caught in between portion A and the sewing machine head 4 When returning the sewing machine head move the position of button clamp unit in the direction of C so that portion B of button clamp unit is located on the rear side of the clamp release arm of the button feeder Otherwise button clamp jaw levers do not open at the time o...

Page 19: ...h ITEM SELECT key 3 Press EDIT key The button clamp unit travels to the origin and goes up 4 Place a button in button clamp jaw levers 5 Depress the pedal to the first step and detach your foot from the pedal when the button clamp unit comes down 6 Turn the hand pulley and check that the center of the nee dle enters the center of the button 7 If the center of the needle is not located in the cente...

Page 20: ...sewing pattern If the feed plate interferes with the needle hole guide it will result in the danger of the needle breakage or the like Also if the pedal is depressed during the adjustment the button clamp unit will go up or come down So be careful Do not depress the pedal to the second step during the adjustment in a state that the sewing LED lights up The button carrier will actuate by so depress...

Page 21: ...and move work clamp foot lifting plate back and forth in the direction of arrow to adjust so that the top end of button clamp is 11 mm above throat plate Move work clamp foot lifting plate in direction A to decrease the lifting amount and move it in direction B to increase the lifting amount After the adjustment securely tighten screws 5 Turn knob of the spinner oscillating arm motor on the unit s...

Page 22: ...he bobbin thread coming out of the bobbin case Caution If the retaining of the needle thread is excessive the thread may protrude from the upper side of the button 7 Adjustment of the wiper WARNING Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine WARNING Turn OFF the power before starting the work so as to prevent accidents caused ...

Page 23: ...ment of the button feeder unit control box 9 Installing the save button bar accessory part 1 Install save button bar mounting plate on button clamp base with hexagon screw 2 Adjust so that a clearance of 3 5 to 4 mm is provided between the center of the button and the top end of the save buton bar 3 To adjust the raising amount of the save button bar loosen screw and move the save button bar up or...

Page 24: ...ed after taking out the button from it Be sure to remember that adjustment 2 should be carried out whenever the aforementioned adjustments have been carried out 2 Adjusting the fine positioning completion switch RFIN Fine positioning completion switch hereinafter called RFIN which incorporates a proximity switch is the sensor to detect a button when the button is set on the carrier pin Place a ø10...

Page 25: ...ons to be used using the adjusting plate Adjust so that the periphery of the button is flush with the periphery of feed plate A 3 Adjust the clearance into which the button is placed using adjusting plate Adjust the clearance to allow only one button to go through it Once the feed plate is correctly positioned fix it by tightening screw Close the other holes using frame and fix the frame using scr...

Page 26: ...out cap and replace the feed plate Use the feed plate of ø16 mm when sewing buttons of which diameter is ø10 to ø15 mm If the outside diameter of the button is ø16 to ø18 mm use the feed plate of ø22 mm To adjust the position of the feed plate confirm that the pinion is in its origin and attach the feed plate at the position where the matchmark countersinking on the pinion aligns with the matchmar...

Page 27: ...buttons using the button feeder adjusting variable resistor Caution Sensitivity adjusting variable resistor is very delicate It is advisable to place buttons with flat bottom in the feeder bowl and adjust the flow of buttons while checking the actual flow of the buttons This will allow you to adjust the flow of buttons with ease Positioning stopper screw Feed plate Pan Triple pawl 0 5 mm 0 5 mm Eu...

Page 28: ...earance ℓ2 between the lower surface of the button guide and the track surface of the feeder bowl is 0 3 to 0 5 mm A clearance which is larger than the value twice as thick as a button by approximately 0 7 mm should be provided between overflow prevention plate and the button Loosen screw and adjust the clearance to the correct value Adjust clearance C between the button guide and the feed plate t...

Page 29: ...ge the position of the feeder bowl 5 Adjusting the position of the feeder bowl Loosen six lock nuts in feeder base and adjust the height so that the feeder bowl comes above when the difference in level between the outlet of buttons of the feeder bowl and the pan is within 0 5 mm If the difference in level is excessive two buttons enter the feed plate in piles So be careful Feeder bowl installing s...

Page 30: ...ting plate in the vertical direction loosen screw and set dimension A approximately to 0 7 mm 2 When the button thickness changes 1 Adjust so that buttons in the feeder bowl smoothly flow and the selector plate discriminates the right sided buttons from the wrong sided buttons without fail Refer to Adjusting the feeder bowl components 1 When the number of holes in a button changes 1 The button car...

Page 31: ...When the outside diameter of button changes Adjust so that buttons in the feeder bowl smoothly flow and the selector plate discriminates the right sided buttons from the wrong sided buttons without fail Adjust the feed plate A in the radial direction The feed plate A has three holes with different diameters i e large medium and small 1 The small hole is used for buttons of which outside diameter i...

Page 32: ...the spinner oscillating arm Replace the motor for the index unit Troubles Normal operation given during the normal stand by state of the sewing machine RAM check error CPU check error Sewing machine starter is defec tive Fine positioning error Occurs when the automatic but ton discharging function continu ously works three times Spinner oscillating arm error The motor is kept turned ON over a pred...

Page 33: ...ning force for the button Correct the leaf spring so that it does not excessively work Replace the current button clamp with another one of which lever plate is thicker than the current one Trouble Phenomenon 1 Thread slips off the needle at the sewing start Or the machine starts sewing a button from an intermediate step of button sewing procedure 2 Needle breakage frequently occurs 3 The finished...

Page 34: ...165 89806 F1 3 1 1 0 165 87206 D 3 1 1 2 165 89004 X 3 1 1 4 165 89202 Z 3 2 Tapered 165 89905 G1 3 6 1 2 165 90705 H1 4 0 1 2 165 89707 E1 VIII OPTIONAL PARTS 1 Kinds of the button carrier Shape of button carrier Special order type For 4 holed button Code Dimension A mm Distance between the holes in a button Dimension B mm Diameter of set pin Part No Standard type A B A ...

Page 35: ...7909 L 2 6 1 0 165 87602 H 2 6 1 2 165 88006 M 2 8 1 0 165 87701 J 2 8 1 2 165 88105 N 3 0 1 0 165 87800 K 3 0 1 2 165 88204 P 3 8 1 2 165 87107 C For 2 holed button Shape of button carrier Standard type Special order type Code Dimension A mm Distance between the holes in a button Dimension B mm Diameter of set pin Part No This is the spacer to install the button spacer asm Q124 to LK 1903AN BR35 ...

Page 36: ... When replacing the standard work attachment with this work attachment re adjust the fine positioning completion switch 16557704 Work attachment large 9 5 mm Button clamp jaw lever asm for thick buttons right MAZ088230BAA Ditto This work attachment has a bottom of which diameter is standard but is provided with a cross groove on the bottom surface It is suited to special shape buttons such as marb...

Page 37: ...recessed end Part No 18257204 9 5 mm Feed plate asm ø13 5 mm Pan small Feed plate asm ø22 mm 18200956 18201103 16568651 This feed plate has a smaller holes ø13 5 mm for carrying buttons when compared with the standard feed plate When a small button shell buttons in particular of which diameter is ø10 mm is to be fed the button may be reversed when it is delivered to the triple pawl or crack when t...

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JUKI LK-1903BN, Instruction Manual

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