Brother DB2-797 Bedienungsanleitung

SERVICE

MANUAL

FOR

082-8797

082-8798

SINGLE NEEDLE ADJUSTABLE

TOP

AND

BOTTOM

FEED

LOCK STITCH MACHNE

. .

From the library of: Superior Sewing Machine & Supply LLC

CONTENTS

SPECIFICATIONS,........................................................

MECHANICAL

DESCRIPTIONS

I·.

..........................................3

II)

Uppershaftand needle bar mechanism . . . . . . . . . . . . . .. . . . . . . . . . . . 3

IZ]Lowershaftand rotary

hook

mechanism . . . . . . . . . . . . . . . . . . . . . . . . . 4

~Upper

feed mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •. 5

II]

Presser

foot

mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . •. . . . . . . . . . . . . . 6

STANDARD

ADJUSTMENT

I·.............................................. 7

IIJAdjusting feed

timing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

IZ]Adjusting

timing

between needle and rotary hook . . . . . . . . . . . . . . . . 7

~Adjusting

presser

foot

height

. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 8

IIJAdjusting feed

dog

height

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

rn:JAdjusting

feeding

foot

and presser

foot

. . . . . . . . . . . . . . . . . . . . . . .. . . 9

<Alternative

up and

down

movement

feeding and presser

foot>

<Feeding

foot

and presser

foot

height>

. 0

••••••••

••

0...

<Adjusting

feeding

foot

front

and rear

position>

•••

•••••

0...

<Adjusting

feeding

foot

feed>

....

••••

0 0

••••••

•••

•••••

0 • • • • 9

II)Synchronizer

{082-8798)

. . . . . . •. •. . . . . . . . . . . . . . . . . . . •. . . •. . . . . • 10

[l]Replacing fixed and movable knives

{082-8798)

. . . . . . . . . . . . •. . . . .

'OTHER,

.......

.......................................................

[!]Sewing

with

syntheticthread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .

IZ1Sewing

with

vinylon thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .

~Attaching

presser

foot

lifter

set . . . •. . . . . . . . . . . . . . . . . . . . . . . . . . .

IIJAttaching material end sensor . . . . . . . . . . . . . . . . . . . •. . . •. . . . . . . . . . 14

From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATIONS

797]

Optionsare

follows.

Operation panel

E- 20

E-

E-20

E -

E-

100

-1

[B798]

Production coun

brother

P.COUNTER

Material end sensor

SENSORll

e one

the

operation

panels and

the

r t

ogether

From the library of: Superior Sewing Machine & Supply LLC

DB2-B797 DB2-B798

Application Thick material Thick material

Sewing speed 2000spm 2000spm

Sewing

length

0-Smm

0-9mm

Height

presser

foot

14mm 15mm

(knee

lifter)

Height

presser

foot

7.5mm Smm

(presser bar

lifter

lever)

Rotary hook Double sized Double sized

Lubrication Manual lubrication Manual lubrication

Needle

DPx

17#23 (39mm)

DPx

17#23

Weight

machine head 30kg 30kg

Thread take-upstroke 73mm 73mm

Needle barstroke 34mm 38mm

Presser

foot

stroke 4.5mm 4.5mm

Feeding

foot

stroke

2-4.5mm

2.2-4mm

Height

feed dog 1.2mm 1.2mm

Durability • Thread take-up and needle • Thread take-up and needle

barcrank have bearings. barcrank

not

have

bearings.

• Upperfeed rock lever

uses

• Upperfeed rock lever

uses

stud screws.

taper

threads.

-2-

From the library of: Superior Sewing Machine & Supply LLC

IMECHANICAL

DESCRIPTIONS!

[II

Upper shaft and needle bar mechanism

When

the

pulley0 rotates

the

direction

ofthe

arrow,

the

upper

shaft@

rotates.

The

upper

shaft@

then

rotates

the

counter

weight@.

The counter

weight@

turn

rotates

the

attached needle barcrank e.

The needle barcrank e

then

rotates

the

thread take-

lever

The thread

take-up

lever 0 moves

the

needle

bar

f),

attached

the

needle barclamp

and

down.

The needle bar

guided by

the

needle bar bushings, (U) @ and

(D)

- 3-

From the library of: Superior Sewing Machine & Supply LLC

lower

shaft and rotary hook mechanism

When

the

pulley 0

rotates

the

direction

the

arrow,

the

upper

shaft

gear

attached

the

upper

shaft@

also

rotates

The

upper

shaft

gear@

rotates

the

vertical sha

gear

(U)

attached

the

top

the

vertical

shaft

The vertical sha

gear

(U)

then

rotates

the

vertical

shaft

gear

(D)

attached

the

end

the

vertical

shaft

The vertical

shaft

gear

(D)@ in

turn

rotates

the

lower

shaft

gear

f).

The

lower

shaft

gear

then

otates

the

lower

shaft@.

The l

ower

shaft@

rotates

the

rotary

hook@.

-4-

From the library of: Superior Sewing Machine & Supply LLC

Upper

feed

mechanism

<Up

and

down

movement>

When

the

pulley0 rotates in

the

direction

the

arrow,

the

upper

shaft@

rotates.

The upper

shaft@

rotates

the

upperfeed li

fting

eccentric

wheel@.

The upperfeed

lifting

eccentric

wheel@

then

rotates

the

attached

upper

lift

ing feed connector0 .

The upper

lifting

feed connector 0 pivots

the

upper

feed

lifting

rock arm

(R)

The upperfeed

lifting

rock arm

(R)

then

pivots

the

upperfeed

lifting

rock

shaft@.

The upperfeed

lifting

rock

shaft@

turn

pivots

the

upperfeed

lifting

rock arm

f).

The upperfeed

lifting

rock arm

moves

the

link

(L)@ back and

forth.

The

link

{L)@ moves

the

upper

feed

lifting

lever@

and

down.

The upper feed

lifting

lever @ transmits an up-and-down

movement

the

attached

feeding

foot

connector®.

10)

The feeding

foot

connector®

moves

the

feeding

foot

up and

down.

<Back

and

forth

movement>

When

the

pulley

0 rotates in

the

direction

ofthe

arrow,

the

upper

shaft@

rotates.

The upper

shaft@

moves

the

feed

cam

sleeve@ up and

down.

The feed cam sleeve@ moves

the

feed

forked

connector

ill

and

wn.

The feed

forked

connector

ill

pivots

the

feed rock shaft arm ill.

The feed rock

shaft

arm

ill

then

pivots

the

feed rock shaft

The feed rock

shaft

turn

pivots

the

feed rock shaftarm

®.

The feed rock

shaft

arm®

moves

the

upperfeed rock connector

{L)

(f)

and

down.

The upperfeed rock connector

{L)

(f) pivots

the

upper

feed rock arm

{R)

®.

The upperfeed rock arm

(R)

®then

pivots

the

point

the

upper

feed rock shaft

assembly®.

The upper feed rock shaft

assembly®

pivots

the

roller

stud assembly@.

11)

The

roller

stud assembly@

then

pivots

the

upperfeed rock

lever@.

12)

The

upperfeed

rock lev

er@

moves

the

lin

k {S)@ back and

forth.

13)

The

link

(S)@

then

moves

the

feeding

foot

connector bracket

back and

forth.

14)

The

feeding

foot

connector bracket

then

transmits this back-and-f

orth

movement

the

feeding

foot

connector®.

15)

The feeding

foot

connector®

moves

the

feeding

foot

back and

forth.

-5-

From the library of: Superior Sewing Machine & Supply LLC

[!]

Presser

foot

mechanism

When

the

pulley 0 rotates

the

direction

the

arrow,

tat

the

upper

shaft@.

The

upper

shaft@

rotatesthe

upper

feed

lifting

eccentric

wheel@.

The

upp

er feed

lifting

eccentric

wheel@

then

rotates

the

attached

upper

lifting

feed connectore.

The

upper

liftin

g feed connectore pivots

the

upper

feed

lifting

rock arm

(R)

The

upper

feed

lifting

rock arm

(R)

then

pivots

the

upperfeed

lifting

rock

shaft@

The

upper

feed

lifting

rock

shaft@

turn

pivots

the

upper feed li

fting

rock arm

f).

upper

feed

lifting

rock arm

moves

the

link

(L)@back and

forth.

The

link

(L)@

then

moves

the

upper feed

lifting

lever@ back and

forth.

The

upper

feed

lifting

lever@

turn

moves

the

presser

foot

bar

bracket®

back and

forth.

10) The presser

foot

bar

bracket®

then transmits this back-and-

forth

movement

the

presser bar

ID.

11)

The presser bar

moves

the

presser

foot

@ up and

down

From the library of: Superior Sewing Machine & Supply LLC

STANDARD

ADJUSTMENT

lil Adjusting feed timing

penetration

........

Smm

Turn the pulley

make thefeed dog even

with

the needle plate

top

surface.

Loosen

the screw and detach the rear plate.

Loosen

the

two

screws

Adjust the needle penetration

4-6mm shown in the figure above by

turningthe feed

cam

@ in the direction

the arrow.

Adjusting timing between needle and rotary hook

I0. I

less

-7-

Rotate the pulley toward yourself and align

the

rotary hook point 0

with

needle center @ when

the needle

raised

2.2

from its lowestposition.

•

Loosen

the screw

@).

Align the rotary hook

point0

with

the needle center@.

•

this time,

secure

the rotary hook 0

that

the gap between the rotary hook

point

0 and

the needle@

less

than

0.1

mm.

NOTE: When using

nylonthread,

see

P.12.

From the library of: Superior Sewing Machine & Supply LLC

<Needle bar

height>

0.5--l.Smm

Adjusting presser

foot

height

[!]

Adjusting feed dog height

-8-

Adjust

the

gap between the

top

the needle

eye

and rotary hook

point

0.5-1.5 mm when the

rotary hook

point

aligned

with

the

needle

center@.

•

Loosen

the screw

@).

Move the needle bar 0

up and

down

adjust

the

gap.

The

standard presser 0 rise

7.5 mm when

raised using the presser

foot

lifter@.

Loosen

the presser adjusting screw

and raise

the

presser

foot

0 using the presser

foot

lifter

Put a 7.5 mm gauge

something similar under

the presser

foot

Loosen

the screw 0 and move the presser

foot

0 up and

down

adjust.

The

standard feed dog 0 height from the needle

plate

top

surface

1.2

mm when the stitch length

its maximum.

•

Loosen

the

screw@.

Move

the

feed ·lifting arm

up and

down

adjust.

From the library of: Superior Sewing Machine & Supply LLC

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