MK-7 Maintenance Manual Revision3

MK-7 Maintenance Manual
Ver.20120809R02
MK-7 Maintenance Manual
Revision3
(Ver.20120809R02)
1.
2.
3.
4.
5.
6.
7.
8.
Features ------------------------------------------------------------------------------------ P2
Components ------------------------------------------------------------------------------- P2-P3
How to replace the fixed knife and drive knife --------------------------------------- P4-P7
How to adjust the pressure of the knives --------------------------------------------- P8-P9
How to adjust the thread dividing hook ----------------------------------------------- P10-P12
How to adjust the positioning finger --------------------------------------------------- P12
Trimmer troubleshooting and adjustments ------------------------------------------- P13-P15
Parameter List ----------------------------------------------------------------------------- P16-P17
Page 1
MK-7 Maintenance Manual
Ver.20120809R02
1. Features
¾
The drive knife doesn’t extend out from the front edge of the needle plate. Therefore caps
and other garments are not damaged by the protruding knives.
¾
The embroidery field on Caps near the crown of the cap is better, because the MK-7 needle
plate is shorter. The MK-5 required a longer needle plate or an added trimmer guard.
¾
The MK-7 trimmer is faster than the MK-5 due to the MK-5 having to make an intermediate
stop before a trim is completed.
¾
The MK-7 fixed knife and the drive knife are mounted separately. So replacing MK-7 knives is
easier than the MK-5.
¾
The MK-7 knife durability is better than the MK-5.
2. Components
Cylinder bed, etc.
No.
Part
QJ270001
Needle plate Assy MK7-T
No.
QJ210031
Lower thread knife drive rod
QJ210050
Part
No.
Part
No.
Part
Cylinder bed cover for MK-7
No.
NB0QJ210060
Part
Cylinder bed cover for MK7-T
QJ210010
Needle plate base MK7-T
Page 2
MK-7 Maintenance Manual
Ver.20120809R02
Needle plate Assy
No.
QJ270011
Part
Cylinder needle plate MK7-T
QJ270001
Part
Needle plate ASSY MK7-T
No.
QJ270040
Part
Drive knife rotating shaft MK-T
No.
Part
QJ270140
Wave washer MK7-T
No.
Part
QJ270020
Drive knife MK7-T
No.
Part
QJ270060
Metal washer MK7-T
QJ270090
No.
KX270010
Bobbin thread keep stay
ASSY MK7-T
Part
Fixed knife fixing screw
No.
Part
No.
No.
QJ270030
Part
Fixed knife MK7-T
No.
Part
No.
QJ270070
Part
3.2x5x0.5 Washer
QJ270080
M3x2 Hex socket set screw (Black, w/glue)
Needle plate base
No.
QJ210010
Part
Needle plate base MK7-T
No.
KX270430
Part
Positioning finger screw for cylinder
No.
SJ210171
Part
Positioning finger for cylinder(BA)
No.
KC271001
Part
Upper knife rotating shaft
No.
HS210300
Part
Thread dividing hook (Cylinder MK5）
No.
HS210051
Part
Thread dividing hook fixing stay (short type)
Page 3
MK-7 Maintenance Manual
Ver.20120809R02
3. How to replace the fixed knife and the drive knife
1.
How to replace the drive knife
1)
Loosen the drive knife rotating shaft with a screw driver.
2)
Remove the drive knife rotating shaft and drive knife from the needle plate.
3)
Re-assemble the parts according to the figure below.
Drive knife rotating shaft MK7-T
Wave washer MK7-T
Drive knife MK7-T
Metal washer MK7-T
Page 4
MK-7 Maintenance Manual
4)
Ver.20120809R02
After assembling the drive knife and related parts, check the setting of the drive knife and
fixed knife with the following procedure;
(1) Insert a piece of thread into the needle hole
(2) Hook the thread on the v-notch of the drive knife.
(3) Push the drive knife to the cut position.
Please pay attention not to push down on the knife with your fingertip.
Please move the drive knife sideways by pushing the back edge of the moving knife, parallel with the
needle plate. If you move the drive knife by pressing downward, the cutting action is not being tested
accurately because there is extra pressure being applied to the drive knife towards the fixed knife,
than what’s normal.
(4) Cut the thread.
Don’t put tension on the thread. The thread must be loose.
Trimming point
* If the knives do not cut properly, you’ll need to change the fixed knife pressure.
Please refer to “4. How to adjust the pressure of the knives”.
Page 5
MK-7 Maintenance Manual
2.
Ver.20120809R02
How to replace the fixed knife
1)
Loosen the (2) mounting screws for the fixed knife using a screwdriver.
2)
Remove the screws and fixed knife from the needle plate.
3)
Re-assemble the parts according to the figure below.
Counter knife fixing screw
Washer 3.2x5x0.5
Lower thread keep stay assy MK7-T
Counter knife MK7-T
Page 6
MK-7 Maintenance Manual
Ver.20120809R02
Please pay attention to the following points
when you install the fixed knife.
1.
Push the fixed knife in direction 1, and lightly in
direction 2 and tighten screw A for the fixed knife.
The edge of the fixed knife must be parallel with
the edge of the needle plate, as shown.
2.
Please check that the thread keep stay assembly
is not tilted. It should be parallel with the needle
plate. If OK, tighten screw B for the fixed knife.
B
1
2
A
After mounting the fixed knife and related parts, cut the thread manually and check how well the
knives cut.
Please refer to procedure on Page 5.
* If the knives do not cut properly, you’ll need to change the knife pressure.
Please refer to “4. How to adjust the pressure of the knives”.
3.
Driving pin
Special attention. Mounting the needle plate to the needle plate base.
The driving pin of the lower thread knife driving
rod must be set into the groove of the drive knife
properly.
If they are not set properly, the drive knife may
be damaged.
Page 7
MK-7 Maintenance Manual
Ver.20120809R02
4. How to adjust the pressure of the knives
1.
The following symptoms may be caused by improper pressure of the knives;
¾
The thread is not cut.
¾
Cut tail end of the thread after trimming is fuzzy (not cut cleanly).
Please adjust the pressure of the knives according to the following procedure.
1)
Loosen the (2) fixed knife mounting screws with a screwdriver (* A).
*A
2)
By tightening the M3x2 hex socket set screw, the fixed knife’s angle changes and the
pressure between the fixed and drive knives increases.
1
Before adjustment
After adjustment
Page 8
MK-7 Maintenance Manual
Ver.20120809R02
Tightening the hex socket set screw too much causes a gap between the fixed knife and
the trimming position of the drive knife. This may cause trimming errors.
When adjusting the pressure of the knives, please tighten the hex socket set screw a few
degrees at a time, and test the cutting action.
Fixed knife
Drive knife
Trimming position
<Proper adjustment>
The Fixed knife and trimming position of the
drive knife should be close to parallel with each
other and the thread will be cut correctly.
Trimming position
The tip of the fixed knife bends as the 3x2
hex socket set screw is tightened.
<Tightening the set screw too much>
The fixed knife bends too much and causes a gap
between the trimming position of the moving
knife. This can cause trimming errors.
3)
After adjustment, tighten the (2) fixed knife mounting screws that were loosened in step 1
(*A) on Page 7.
4)
Cut the thread manually to see if it cuts properly or not. If the trimming is not done
correctly, please adjust the pressure of the knives again.
Page 9
MK-7 Maintenance Manual
Ver.20120809R02
5. How to adjust the thread dividing hook (trimmer fork)
1.
No.
Part
Please adjust the standby position of the thread dividing hook for MK-7 according to the
following procedure.
HS210070
Hook driving rod
No.
Part
KC271940C
Solenoid lever A
No.
Part
KN272401
Eccentric stopper assy
M3x5 Hex socket bolt
No.
Part
1)
BJ210040
Solenoid stay MK7-T
Loosen the M3x5 hex socket bolt to allow the hook driving rod to move freely.
M3x5 Hex socket bolt
Solenoid lever in standby position
2)
Move the hook driving rod back and forth to allow a gap between the thread dividing hook
and the cylinder bed cover to be 0 ~ 0.5 mm.
0～0.5mm
Page 10
MK-7 Maintenance Manual
3)
Ver.20120809R02
After that, tighten the M3x5 hex socket bolt to lock the hook driving rod in place.
M3x5 Hex socket bolt
2.
Please adjust the engaged position of the thread dividing hook of MK-7 according to the
following procedure.
1)
Loosen the M4x18 hex socket bolt for the eccentric stopper.
M4x18 Hex socket bolt
2)
Turn the eccentric stopper assy to adjust the engaged position.
The gap between the bobbin and thread dividing hook should be 0.7mm when the solenoid
lever is in the engaged position.
0.7mm
Solenoid lever in the engaged position
Page 11
MK-7 Maintenance Manual
3)
Ver.20120809R02
After the adjustment, tighten the M4x18 hex socket bolt to lock the eccentric stopper in
place.
M4x18 Hex socket bolt
6. How to adjust the positioning finger
1.
When adjusting the positioning finger, set the positioning finger so the right side of the
protruding finger is aligned with the center of the needle, as shown below.
Needle position
Positioning finger (cylinder)
The right side of the positioning finger protrusion
is aligned with the center of the needle.
Page 12
MK-7 Maintenance Manual
Ver.20120809R02
7. Trimmer troubleshooting and adjustments
<Case 1 >
Situation : Upper thread is cut, but the lower thread is not cut.
Reason: The drive knife might not be catching the lower thread because the lower thread is loose
and out of position when trimming. This can be brought on by improper tension balance
of the upper and lower threads and/or types of upper thread.
Solution: In this case, check the tension balance of the upper and lower threads and adjust
accordingly. If still a problem, change the values of all the following parameters.
MSU2: #08 ATC type 2
MSU1: #23 Trim option -151
MC: Trim vector 35
<Case 2 >
Situation : Both the upper and lower threads are not cut.
Reason 1: The setting of the drive knife and fixed knife may not be adjusted correctly.
Solution 1: Please refer to section “4. How to adjust the pressure of the knives” on Page 8.
Reason 2: The cutting position of the drive knife might not be set properly.
Solution 2: Check the cutting position of the driver knife with the following procedure.
1)
Turn the machine OFF.
2)
Manually rotate the trimmer cam counter-clockwise so the connection rod moves
to its furthest travel limit to the right as shown in the following photos. There
should also be a White line painted on the trim lever as shown below. The trimmer
cam pin should line up with the White line (as shown) when in the proper position.
Cam Pin
White Line
Connection rod
No.
Part
QJ270131
trimmer cam MK7-T
The figure at the left describes the position of cam
when the connection rod moves to its furthest travel
limit to the right.
The side of the drive cam compared to the side of the
trimmer motor bracket should be at an angle of 18.9
degrees when in the correct stop position.
18.9
Page 13
MK-7 Maintenance Manual
Ver.20120809R02
3)
Loosen the M4x6 hex socket bolt for the driving lever.
4)
Push the lower thread knife driving lever (upper) forward until it will not move any
further. (The driving knife should be pushed against the fixing knife fixing screw.)
5)
Tighten the M4x6 hex socket bolt to lock the lever in place.
M4X6 Hex Socket bolt
No.
Parts
No.
Parts
Push forward
Lower thread knife
driving lever (upper)
6)
QJ270020
Driving knife MK7-T
KX270010
Fixing screw
for fixing knife
Push forward
Double check whether or not the driving pin is visible towards the front side of the
inspection hole in the needle plate. The photo and figure below show the proper
position.
Inspection Hole
This line indicates the
middle of the Driving Pin.
The Driving Pin must be
close to the front edge of
the hole.
Driving Pin
7)
Execute a manual trim operation to check whether the thread cuts properly.
Page 14
MK-7 Maintenance Manual
Ver.20120809R02
Reason 3: The adjustment of the knife protection unit may not be set correctly.
Solution 3: The compressed length of the cushion spring for the knife protection unit should be
31mm. If it’s more than this, it may cause trimming errors.
31mm
Page 15
MK-7 Maintenance Manual
Ver.20120809R02
8. Parameter list
MC Settings
No
Item
Default
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Borer 1
Trim jumps
Lock stitch
Clamp type
Slow up count
Trim type
Trim dir
Trim vector
Low speed
Jump divide
Stitch back
Overlap
Auto start
Swing
Frame start
S. frame
Needle down
Applique
T. break
0 admit
Combine data
Right limit
Left limit
Back limit
Front limit
LCD mode
LCD bright
Roll to roll
WS system
Clamp frame
V. clamp
H. clamp
Frame option
Sequin size L1
Sequin size R1
Network type
Marker type
Borer 2
Borer 3
Sequin size L2
Sequin size R2
Special MC
0
2
1
3
3st
1
0
15
450
127
4
4
1
0
70°
0
1
80°
3
0
0
115mm
115mm
110mm
110mm
0
2
----0
0
0
--0
0
--1
0
0
-------
Setting value
Page 16
MK-7 Maintenance Manual
Ver.20120809R02
MSU1, MSU2 settings
MSU1
MSU2
setting list
No.
Item
Default
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
MSU2 protect
MSU1 password
Heads
Needles
Max. speed
Slow down start
Slow down speed
ATC type
Color motor type
Brake type
Motor ratio
Stop angle
P. coder
F. motor type
F. move pattern
V. motor
H. motor
V. sensor
H. sensor
Origin sensor
Jump on angle
Jump off angle
Roll to roll type
WS type
WS head space
LSC type
T. break type
Sequin device
Bobbin changer
Chenille type
Jump on delay
Jump off delay
--5
--9
1000
45
600
1
----267
240
0
2
2
1
0
1
1
1
190
120
----------0
----25ms
25ms
setting list
No.
Item
Default
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
MC Change
UTSM
T. break off
Float speed
Jump on speed
Cap max. speed
Slider off time
Fork off time
Trim motor off
ATC option
Clamp off angle
Color motor off
Vector control
Light curtain
Network
Detect disable
F. motor option
B. changer time
M. up
10/Hz
M. down 10/Hz
Clamp control
F. move mode
Trim option
1
0
10
120
650
650
500
540
30
0
295
5
1
0
0
0
0
0
0ms
0ms
0
0
0
Set
value
2
Set
value
４
Page 17