JUKI LU-2810 Series Manuale utente

PARTS & INSTRUCTION MANUAL

EDGE CUTTING DEVICE WITH COUNTER KNIFE

JUKI LU2810

TABLE OF CONTENTS Page:

Notes of Safety 2

Electrical Schematic 3

1. Mounting the Edge Cutting Unit 3

2. Functional description 3

3. Mode of Operation 4

4. Knife Change 5

5. Knife Adjustments 6

6. Adjusting the Edge Stop 7

7. Knife Speed 7

8. Knife Input Delay 7

9. Source of Error 8

1 . Maintenance 8

Images 9

Knife Adjusting Guidelines 12

Electrical Diagram

Parts List 14

NOTES OF SAFETY

1. The machine must only be commissioned in full knowledge of the instruction

book and operated by persons with appropriate training.

2. Before putting into service also read the safety rules and instructions of the motor

supplier.

3. The machine must be used only for the purpose intended. Use of the machine

without the safety devices is not permitted. Observe all the relevant safety

regulations.

. When gauge parts are exchanged (e.g. needle, presser foot, needle plate, feed

dog and bobbin), when threading, when the workplace is left, and during service

work, the machine must be disconnected from the mains by switching off the

master switch or disconnecting the mains plug.

5. Daily servicing work must be carried out only by appropriately trained persons.

6. Repairs, conversion and special maintenance work must only be carried out by

technicians or persons with appropriate training.

7. For service or repair work on pneumatic systems the machine must be

disconnected from the compressed air supply system. Exceptions to this are only

adjustments and function checks made by appropriately trained technicians.

8. Work on the electrical equipment must be carried out only by electricians or

appropriately trained persons.

9. Work on parts and systems under electric current is not permitted, except as

specified in regulations DIN VDE 0105.

10. Conversions or changes to the machine must be authorized by us and made only

in adherence to all safety regulations.

11. For repairs, only replacement parts approved by us must be used.

1. Mounting the Edge Cutting Unit

The edge cutting unit is mounted from the rear onto the machine. The

respective adapter plate for the corresponding sewing machine is

included in the kit.

Possibly some drillings must be made according to the attached drill plan.

1.1 Installation of the motor control

The drive for the edge cutter is screwed under the table.

Electrical connection:

ATTENTION:

Risk of death by electric shock!!!

The motor controller is allowed to be connected by

qualified electrical only!

Unplug the power plug before working on electrical

equipment!

Secure the power cord from accidentally reconnecting!

Make sure to observe the correct voltage (100-250 V AC, 7-63 Hz). All

other connections see enclosed circuit diagram.

It is recommended to us a machine main switch!

2. Functional Description

Right beside the needle a special punching knife is arranged, that cuts

perpendicularly from above.

In the needle plate a tungsten carbide counter knife is attached.

The upper knife is driven by a direct current gear motor.

By the motor start signal a pneumatic cylinder is switched on for lowering the knife.

The control works with an appropriate tip-switch or via a knee-lever switch.

The edge cutting device is characterized by the following:

-Additional attachment onto usual flat-bed- or post-bed-machines

-Very high life time of the knifes

-Very fast and simple knife change

-The upper knife can be sharpened

-Knife speed is adjustable

-Cutting distances: 1.2 – 6.0 mm

Attention: At devices with an edge cutting distance of 1.2-2.5 mm the

maximum pass length is 4 mm. The maximum needle size

at a cutting distance of 1.2-1.5 mm is N 90. At non-

compliance of these defaults needle breakage and the

destruction of the needle plate and the lower knife is the

result.

3.0 ode of Operation

Switching ON or OFF is made by a push-button or by a knee-lever-switch.

The knee-lever-switch is not part of the scope of delivery. If

necessary it must be ordered separately!

Following functions are possible by the knife control (fig.2):

a) Knife motor off

b) Cutting stop – foot lift up

Is this toggle switch placed “ON” the knife drives upward

when the foot is lifted up and begins automatically to run

when lowering again.

c) Cutting stop – seam end

Is this rocker switch switched “ON” the knife turns off

automatically after the end of the seam (L.G. impulse). The

renewed switching on of the knife is made by a push-button or

by knee levers.

d) Automatic OFF/ON

-If the toggle-switch is turned to “Automatic OFF/AUS“

the usual mode of operation is applicable that means the

blade runs even when the machine stops.

-If the toggle-switch is turned to “Automatic ON/EIN“ the

knife is only running while sewing.

* Only activate the toggle-switch when the knife is

turned off

Process:

-Turn OFF the knife

-Turn toggle-switch “Automatic ON/EIN“

-Turn on the knife at the green “Power”-button

-The knife is running into the cutting position without starting

-As soon as the sewing machine is sewing the knife starts cutting and stops

again together with the sewing machine

-The auxiliary functions “cutting stop feet lift-up” as well as “cutting

stop seam end” can be also connected if necessary.

This new auxiliary function can be an advantage with certain material

outlines, particularly because thereby the knife abrasion is lowered

3.1 Finger protection

Each machine is equipped by us with a protecting device.

This can be ordered both as a Plexiglas as well as a wire protection.

4.0 Knife Change

If the parts are not cut through cleanly or if the cutting edge is frayed the knife

has to be changed or regrinded.

The upper knife can be regrinded. (grind device – Id.-No: - 66838 -) The

lower knife cannot be regrinded.

ATTENTION: Before knife change the main switch at the sewing

machine has to be switched OFF !

4.1 Changing the upper knife

If the main-switch is switched off the knife drives into the upper position (fig.1) -

Loosen screws “3“ and change the knife

I PORTANT: The knife must be installed all the way up to the

knife stop “4“! (fig 1)

4.2 Changing the lower knife

-Loosen both screws “5” on the stitch plate

-Set in the new lower knife

ATTENTION: Pay close attention to the correct installation of the lower

knife!

The lower knife has a special grinding. The cusp of the knife must point at the

upper knife.

If the new knife is installed, please control as follows:

-Switch on the main-switch at the sewing machine

-Turn the toggle-switch at the knife motor to “OFF“ (fig.2)

-Turn on the punching knife with the knurled screw to the upper dead point

-Switch on the knife by the push button or by the knee lever

-Now the knife drives into its working position. The driving motor is still

switched off.

-Rev up the motor once by the knurled screw, fastened on the motor shaft

and check the knife impact. Make a thread test as follows: When manual

spinning the wheel, a thread must be cut through perfectly.

-If the knife impact is correct, push the push-button once again (knife goes

upwards) and throw the toggle-switch “1“ (fig.1) to “ON“ again.

-Now you can start working again!

5. Knife Adjustments

ATTENTION:

Before adjusting the kniv

–

turn OFF the ma

switch at the

sewing machine!

-By loosening screws “6“ (fig.1) the knife can be adjusted to the sewing

direction.

-By adjusting the stop “ “ (fig. 1) the impact depth of the knife can be

adjusted.

-By the stop-bolt “1“ (fig.1) the blade pressure can be defined

-The lower knife fixed and cannot be adjusted

-The twist from the upper to the lower knife can be adjusted as follows:

Loosen screw “5” (fig.1) and

twist eccentric “7”

-The knife throw is defined by the integrated eccentric

-The top dead center and/or the bottom dead center is adjusted via the

screws “1” (fig.3)

ATTENTION:

At the following procedures a cutting test must be made

(see item 3. ):

-changing the upper knife

-changing the lower knife

-changing the stitch plate

These knife adjustments are already set by MJF at assembly and

normally never have to be changed!

6. Adjusting the Edge Stop

For post-bed-machines a pneumatic stop is attached at the machine bed. This

stop is activated by a pneumatic toggle switch.

The stop width is adjusted either by shifting the cylinder “1” or by shifting the

stopper “2” inside the cylinder.

7. Knife speed

The maximum knife speed is adjusted by MJF. By the rotary knob (h) (fig.2)

the knife speed can be regulated.

With the left potentiometer on the control board (fig.5) the maximum

blade speed can be adjusted and with the right potentiometer the

minimum blade speed.

These settings are made prior to delivery and should not be changed!

8. Knife switch-on delay time

By knife switch-on delay time one understands the time from the knife

lowering impulse to the knife approach impulse.

3 time adjustments are possible:

1. Rotary switch 1 to 0 = 0.1 sec (preset)

2. Rotary switch 1 to 2 = 0.5 sec

3. Rotary switch 1 to = 1.0 sec

Likewise one can affect the switch-on time over the throttle in the inlet to the

remote cylinder.

The speed of the knife depends on the material which has to be processed, as

well as on the number of revolutions of the sewing machine and/or the stitch

length.

IMPORTANT: The more slowly the knife speed, the more service life of

the knives!

9. Source of error

9.1 Knife does not cut

-Check if the lower knife is correctly installed

-Check the blade of the lower knife

-Check cutting pressure, over cut and screwing

9.2 Knife motor does not start

-finger protection has to be folded down

-turn higher the potentiometer speed

-check the position of the switches at the control unit (knife motor “ON” ?)

-check the knife of smoothness (turn by hand)

-check compressed air

1 . Maintenance

10.1 The edge cutting tool is extensively maintenance-free, however the oiling points

we marked on the pictures, should be oiled twice weekly.

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