Installing The Knife; Checking The Sewing Machine In The Delivered State - JUKI LBH-1790A Series Instruction Manual

7. Installing the knife

WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❷
❶
Inch → mm CONVERSION TABLE
Knife size
1/4
3/8
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2

8. Checking the sewing machine in the delivered state

When replacing the knife with a new one, perform as
follows.
1) Knife ❶ can be easily removed together with the
2) Lower the knife bar by hand. Now, push the knife
1 to 2 mm
When the cloth cutting knife you have is indicated in
Indication of mm
inch, set the cloth cutting length (knife size) in mm
6.40
using the inch
9.50
13. Sewing data list"
11.10
12.70
14.30
15.90
17.50
19.10
20.60
22.20
25.40
28.60
31.80
34.90
38.10
– 17 –
washer when removing knife retaining screw ❷ .
bar down so that the knife goes below the top
surface of the throat plate by 1 to 2 mm, as illus-
trated in the figure. In this state, place the wash-
er and tighten the setscrew.
→ mm conversion table. (Refer to
p.33.)
If the work clamp is in its upper posi-
tion when it is delivered to your work-
shop, it is necessary to lower the work
clamp before turning on the power to
the sewing machine.
When lowering the work clamp, take
care not to place your hands near the
knife.
If the power is turned ON with the
work clamp raised and the ready key
is pressed, "E998 Work clamp devia-
tion error" can occur.
"V-