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Mitsubishi LU2-4410 User Manual

Mitsubishi LU2-4410
28 pages
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OPERATION
I
Adjustment
of
feed
(stitch)
length
and
stitch
reversing (touch back)
Note:
To
make
feed
(stitch)
length
smaller,
depress
the
feed
reverse
lever
and
set
the
feed
length
setting
dial
to
a
desired
position.
Feed
length
I
setting
dial
Feed
reverse
lever
Setting
of
bobbin
(1) Pull
out
5
cm
thread
tail
from
the
bobbin.
(2) Hold
the
bobbin
so
that
the
bobbin
thread
is
would
in right direction
and
put it into
the
hook.
Touch-back
button
. . .
Direction
of
stitching
can
be
reversed
by
depressing
this
button.
Stitching
goes
on
in
reversed
direction
while
the
button
is
held
down,
and
returns
to
forward
direction
when
the
button
is
released.
Touch-back
Thread
tail
- 7 -
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Table of Contents

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Mitsubishi LU2-4410 Specifications

General IconGeneral
ClassIndustrial
Stitch TypeLockstitch
NeedleDPx5
HookRotary hook
LubricationAutomatic
Presser Foot LiftManual

Summary

PRECAUTIONS BEFORE STARTING OPERATION

Safety Precautions

General safety guidelines for operating the sewing machine, focusing on hand and body safety.

Precaution before Starting Operation

Essential checks and preparations before operating the sewing machine, including oiling and power.

Precaution for Operating Conditions

Advises on environmental conditions to avoid for optimal machine performance and longevity.

PREPARATION FOR OPERATION

Power cable connection

Instructions for connecting the power supply to the control box, including phase connection and grounding.

Lamp Leads

Guidance on connecting the illuminating lamp, including insulation and precautions against overloading.

Rotary Direction

How to check and change the motor's rotational direction for proper machine operation.

PREPARATION FOR OPERATION

Connection of control box

Detailed instructions for connecting the control box to the machine head, including model compatibility.

Adjustment of needle bar stop position

Steps to adjust the needle bar's 'UP' and 'Down' stop positions for precise machine stopping.

CAUTIONS ON USE

Oiling (1)

Instructions for filling the oil reservoir and maintaining the correct oil level for lubrication.

Oiling (2)

Guidance on initial oil replenishment for new or long-unused sewing machines.

CAUTIONS ON USE

Oiling condition

How to check the oiling condition during operation using the oil sight window.

Adjustment of oiling to rotating hook

Details on adjusting the oil flow to the rotating hook for proper lubrication.

Cautions on operation

General operating precautions including pedal safety, dust, and multimeter use.

OPERATION

Installation of needles

Step-by-step instructions for correctly installing single and double needles.

Winding of bobbin thread

Procedures and adjustments for winding thread onto the bobbin, including tension and length.

OPERATION

Selection of thread

Recommendations for selecting the correct thread twist for needles and bobbins.

Threading of needle threads

Detailed instructions for threading the needle and upper threads through various guides.

OPERATION

Adjustment of feed (stitch) length and stitch reversing (touch back)

How to adjust stitch length and use the touch-back button for reversing stitches.

Setting of bobbin

Instructions for correctly placing the wound bobbin into the hook assembly.

OPERATION

Threading of bobbin threads

Procedure for threading the bobbin thread through the hook and leading it backward.

Balance of thread tension

Visual guide to achieving balanced thread tension for sewing.

Needle thread tension

How to adjust needle thread tension and its relation to bobbin thread tension.

Adjustment of presser foot pressure

Instructions on adjusting the pressure applied by the presser foot to the fabric.

OPERATION

Timing between rotating hook motion and needle motion

Critical steps for synchronizing the hook and needle movements for proper stitching.

OPERATION

Adjustment of feed dog height

How to adjust the feed dog height for different fabric types and stitch assurance.

OPERATION

Relationship between rotating hook motion and take-up lever motion

Steps to re-align the timing belt for proper hook and take-up lever synchronization.

Relationship between hook motion and opener motion

How to adjust the gap between the bobbin case holder and the opener for smooth operation.

OPERATION

Relationship between needle motion and feed dog motion

Adjusting the link mechanism to synchronize needle and feed dog movements for correct feeding.

OPERATION

SAFETY CLUTCH DEVICE

Explanation of the safety clutch function and how to set and adjust its force.

OPERATION

UPPER FEED ADJUSTMENT (NEEDLE SIDE)

How to adjust the upper feed length to correct uneven fabric feeding.

Outside presser foot and inside presser vertical stroke adjustment

Adjusting the vertical movement of presser feet for varying fabric thicknesses.

OPERATION

Adjustment of forward/backward stitch length

Method for adjusting stitch length in both forward and backward directions.

Installation of movable knife

Steps for correctly installing the movable knife for thread trimming.

OPERATION

Gap between movable knife and bobbin case holder stopper

How to adjust the gap between the movable knife and the inner hook stopper.

Adjustment of thread trimmer cam

Adjusting the thread trimmer cam for proper synchronization with the movable knife.

OPERATION

Adjustment of needle threads tension release assembly

How to adjust the needle thread tension release mechanism for proper function.

OPERATION

Adjustment of scissoring pressure of movable knife and fixed knife

Adjusting the meshing pressure between knives for effective thread trimming.

Sharpening of fixed knife

Instructions on how to sharpen the fixed knife when it becomes dull.

OPERATION

Adjustment for change of needle-to-needle distance (LU2-4430)

Steps to adjust the needle-to-needle distance for specific models.

ADJUSTMENT AND OPERATION OF CONTROL UNIT

Setting the 1-2 POSITION Switch

Explains how the 1-2 POSITION switch determines the machine's stop position.

Pedal Operation

Details the two-step pedal mechanism for thread trimming and presser foot lifting.

Adjusting the Pedal Toeing and Heeling Pressures

How to adjust the lever unit spring pressure for pedal control.

ADJUSTMENT AND OPERATION OF CONTROL UNIT

Adjusting the Operating Speeds

Guides on adjusting maximum, low, positioning, thread trimming, and backtacking speeds.

ADJUSTMENT AND OPERATION OF CONTROL UNIT

Optional Functions

Explains how to use internal switches and external connectors for various machine functions.

ADJUSTMENT AND OPERATION OF CONTROL UNIT

Option connectors

Details the functions and connections for option connectors related to machine operation.

SPECIFICATIONS

Model

Lists the specifications for different models of the sewing machine.

Application

Describes the intended application for each sewing machine model.

Max. sewing speed

Specifies the maximum sewing speed in stitches per minute (spm).

Stitch length

Indicates the adjustable range for stitch length in millimeters.

Presser-foot stroke

Details the presser foot stroke measurement in millimeters.

Needle No.

Specifies the type and size of needles used for the machine.

Needle-bar stroke

Provides the needle-bar stroke measurement in millimeters.

Thread take-up lever stroke

Specifies the thread take-up lever stroke in millimeters.

Vertical stroke of upper feed

Indicates the vertical stroke range of the upper feed mechanism.

Automatic Thread trimmer

Indicates whether the machine is equipped with an automatic thread trimmer.

Touch back

Shows the availability of the touch back function.

Hook (horizontal full-rotating)

Describes the type of hook mechanism used.

Bobbin

Specifies the type or size of bobbin used.

Lubrication system

Details the type of lubrication system employed by the machine.

Oil

Specifies the type of oil recommended for lubrication.

Bed dimensions

Provides the physical dimensions of the machine bed.

Needle gauge

Lists the available needle gauge sizes.

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