JUKI MEB-3200C User manual

MEB-3200C
Needle thread clamp unit
INSTRUCTION MANUAL

CONTENTS
1. BEFORE INSTALLATION AND OPERATION OF THE NEEDLE THREAD
CLAMP UNIT ............................................................................................ 1
(1) How to install the needle thread clamp unit (when the needle thread guide
(32051708) is installed) .......................................................................................... 1
(2) How to install the needle thread clamp unit (when the needle thread guide
(40023465) is installed) .......................................................................................... 2
2. Installing the needle thread clamp unit................................................... 3
3. Connecting the pneumatic components................................................. 4
4. Adjusting the pneumatic components .................................................... 6
(1) Adjusting the thread clamp force (reducing valve) ............................................ 6
(2) Adjusting the speed controller ............................................................................. 6
5. Setting the memory switch....................................................................... 7
6. Adjusting the length of remaining needle thread................................... 7
i

- 1 -
Approx. 1 mm
Approx. 1 mm
❹
❷
❼
A
❻
󱢳
❻
❾
1. BEFORE INSTALLATION AND OPERATION OF THE NEEDLE
THREAD CLAMP UNIT
(1) How to install the needle thread clamp unit (when the needle thread guide
(32051708) is installed)
Install needle thread clamp asm. ❼in the screw hole on the left side Aand close to the needle for use.
In this case, the length of needle thread to clamp can be adjusted to a short one with the procedure of "6.
Adjusting the length of remaining needle thread" P.7 . In addition, rolling of needle thread at the start
of sewing can be facilitated. (There is no thread tension disk on the needle bar.)
Set the compensation of needle thread tension (U09) to “0” when using this unit. When the value is
set to a higher one, the length of remaining needle thread will be unstable.
(Fig. 1)

- 2 -
(2) How to install the needle thread clamp unit (when the needle thread guide
(40023465) is installed)
Change the installing position of needle thread clamp asm. ❼to the screw hole on the right side B, (make it
apart from the needle), and adjust the clearance between the thread tension disk setscrew and it to 1.5 to 2
mm for use.
Set the compensation of needle thread tension (U09) to “0” when using this unit. When the value is
set to a higher one, the length of remaining needle thread will be unstable.
(Fig. 2)
Approx. 1 mm
1.5 to 2 mm
❼
B
󱢳
❽
❻
❷
❹
❺

- 3 -
1) Turn OFF the power and the air.
2) Remove the presser units, left and right.
3) Change the installing position of joint ❸in the
direction of approximately 60˚ so that the needle
thread clamp unit does not interfere with the air
tube.
4) Remove two direct drive metal setscrews ❶
located in the rear and x needle thread clamp
unit ❷with two direct drive metal setscrews ❶.
1. When installing the needle thread
clamp unit, use the hexagonal wrench
key (32025603) supplied with the unit
as accessories.
2. Install needle thread clamp unit ❷so
that it is almost parallel to the sewing
direction.
2. INSTALLING THE NEEDLE THREAD CLAMP UNIT
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
❶
❶
❷❸
(Fig. 3)
1. Install needle thread clamp unit asm. ❼so that the bottom surface of needle thread clamp asm.
❼is almost parallel to the presser unit or the looper thread trimming knife cover.
2. Adjust the clearance between looper thread trimming knife cover ❻and needle thread clamp
asm. ❼to the actual sewing product so that the sewing product does not come in contact with
needle thread clamp asm. ❼.
8） Press button.
9） Press button.
10) Turn the needle bar to the right and left by hand to adjust the direction of needle thread guides ❾/❽as
shown in Figs. 2/3.
11)Turn the pulley to move the needle bar up and down, and stop it at the position where the needle is
closest to the needle thread clamp.
12) Press the (01) "Presser button" to lower the presser foot.
13) Press the (09) "Needle thread clamp" to lower the needle thread clamp.
14) Adjust the clearance provided between looper thread trimmer cover ❻and needle thread clamp ❼, and
the clearance provided between needle thread guides ❾/❽respectively. Then, tighten needle thread
clamp asm. xing screws ❺(two pieces). The aforementioned clearances can also be adjusted with four
setscrews 󱢳.
15) After the adjustment, operate the sewing machine under the test mode to make sure that the needle bar
does not come in contact with the needle thread clamp.
Refer to Figs. 2/3 given below. (After you have
carried out the procedure up to "4. Adjusting the
pneumatic components")
5） Attach right and left presser units ❹.
6）Loosen needle thread clamp asm. xing screws
❺(2 pieces).
7）Turn ON the power and air.

- 4 -
1) Loosen setscrew ❶in the end block, draw end
block ❷in the direction A to draw out from rail ❸.
2) Insert solenoid valves ❹and ❺in the order into
the positions as shown in the illustration. (Valve
with reducing valve ❹is above.)
3) Insert end block ❷into rail ❸and tighten
setscrew ❶while making the end block come in
close contact with the solenoid valve.
1. When tightening setscrew ❶, if the
respective solenoid valves do not
come in close contact with the end
block, air leakage will be caused.
Be careful that there is no clearance
between them.
2. Be sure to attach bushes ❻(3 pcs.)
supplied with the unit as accessories
to the respective solenoid valves.
4) Connect solenoid valve cables ❼to the
respective solenoid valves ❹and ❺.
5) Insert pins of solenoid valve cable ❼into the
designated positions of connector ❽.
There are no marks “8” and “9” on
solenoid valves ❹and ❺supplied with
this unit as accessories.
3. CONNECTING THE PNEUMATIC COMPONENTS
(Fig. 4)
(Fig. 5)
(Fig. 6)
❺
❹
❼
(No.8)
(No.9)
10 7
❶
❸
❷
A
❸
❹
❻
❺
❶
❷
(No.9)
(No.8)
Solenoid valve No. Cable color Connector No.
❹No.8 Red 15
❹No.8 Black 16
❺No.9 Red 17
❺No.9 Black 18
3
16
❽
1
2
17
15
4
18
(Fig. 7)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.

- 5 -
6) Draw the cables up to the bottom of the table
as shown in the illustration on the left, and x
them with the clip bands supplied with the unit as
accessories.
7) Connect the air tube on the side where the needle
thread clamp closes to port B (reducing valve of
solenoid valve ❹) of solenoid valve ❹.
8) Connect the air tube on the side where the
needle thread clamp opens to port A (joint on the
connector side of solenoid valve ❹) of solenoid
valve ❹.
9) Connect the air tube on the side where the
needle thread clamp goes up to port B (side
where connector of solenoid valve ❺does not
exist) of solenoid valve ❺.
10) Connect the air tube on the side where the
needle thread clamp comes down to port A (side
where connector of solenoid valve ❺exists) of
solenoid valve ❺.
❹
❺
Port A
Port B
Port A
(Fig. 8)
(Fig. 9)
Port B

- 6 -
(1) Adjusting the thread clamp force
(reducing valve)
Adjust adjusting screw ❶of the reducing valve
and adjust the thread clamp force in accordance
with the thread used so that the thread smoothly
comes o󰀨 the needle thread clamp during sewing.
Standard : Adjust the force by turning adjusting
screw ❶approximately 10 times
from the fully closed state to the
open.
• When the clamp force is strong :
1. Needle breakage may occur.
2. The stitches on the right side of
sewing may rise.
• When the clamp force is weak :
3. Needle thread may not be clamped.
4. Threadmaycomeo󰀨duringclamping.
(2) Adjusting the speed controller
Adjust speed controllers ❷and ❸respectively to such an extent that there is no shock when moving the
needle thread clamp unit up or down.
1. If up/down operation of the unit is excessively retarded, the operation timing cannot be
adjusted and needle thread clamp failure may occur, or the unit may interfere with other
components.
2. If up/down operation of the unit is excessively advanced, breakage of the components of the
needle thread clamp unit may be caused.
4. ADJUSTING THE PNEUMATIC COMPONENTS
❶
❷
❸
(Fig. 10)

- 7 -
It is the standard to adjust the length of remaining needle thread to a short one so that the clamped thread can
be neatly rolled. Adjust the length of needle thread to clamp to a short one in the following procedure and rolling
of the needle thread at the start of sewing can be facilitated. It is possible to roll the thread up to sewing length of
approximately 20 mm.
(There is a case where rolling may not be stabilized even in case of 20 mm or more in accordance with the sewing
conditions.)
When the amount of remaining thread is desired
to be further shorter, loosen screws ❶, and slide
screws ❶in the direction of arrow mark A.
When the drawing amount of needle
thread is excessively small :
1. Threadmayslipo󰀨needle.
2. Thread knotting failure at the start of
sewing may occur.
3. Needle breakage may occur.
Set the memory switch U59 (needle thread clamp setting) to "1" (enable).
■Memory switch
5. SETTING THE MEMORY SWITCH
6. ADJUSTING THE LENGTH OF REMAINING NEEDLE THREAD
(Fig. 11)
❶
A
Change the set value of memory switch U60 so that needle thread can be neatly sewn in accordance
with the sewing conditions. In case of increasing the set value, be careful of the interference with
the longitudinal guide.
No. Function Description
Standard
value
Setting
range
Unit
U59 Needle thread clamp
setting
0: Without 1: With 0 0 to 1 ー
U60 Number of stitches
of releasing needle
thread clamp
Number of stitches from the start of swing to
releasing needle thread clamp
5 0 to 99 Number
of stitches
K23 Moving amount of
closing needle thread
clamp
Moving amount from the end of sewing to closing
needle thread clamp
23 0 to 50 mm