Highlead GC24688 User Manual
SHANGHAI HUIGONG NO.3 SEWING MACHINE FACTORY
GC24688Series
1-/2-Needle Post-Bed Compound-feed Lockstitch Industrial
Sewing Machine
Instruction Manual
Parts Catalog
-----Abstract-----
1. PRECAUTI O N BEFORE STARTING OPE RATION ·································································· 1
1) Safety precaution ······················································································································· 1
2) Precaution before starting operation ··························································································· 1
3) Precaution for operating conditions ···························································································· 1
2. SPECIFICATIONS······················································································································ 1
3. PREPARA TION BEFORE STARTI NG TO OPERATE ································································ 2
1) Connection of control box ········································································································· 2
2) Connection of pneumatic parts ·································································································· 2
3) Oil pan ······································································································································ 3
4) Operation panel ························································································································· 4
5) Adjusting the needle stop position ····························································································· 4
4. HOW T O USE TH E MACH I NE ································································································· 5
1) Threading ······························································································································ 5
2) Adjusting of the thread regulator ······························································································ 5
3) Adjusting of upper thread tension ·························································································· 5
4) Winding the lower thread ········································································································· 6
5) Threading the lower thread ······································································································ 6
6) Adjusting the lower thread tension ··························································································· 6
7) Installing the needle ················································································································· 7
8) Alternating presser foot movement amout ················································································ 7
9) Adjusting the presser foot pressure ·························································································· 7
10) Adjusting the stitch length ······································································································· 8
11) Using the manual switches ······································································································· 8
12) Cleaning ································································································································ 9
13) Lubrication ······························································································································ 9
14) Adjusting the trailing length after thread trimming ································································· 10
15) Back tacking ·························································································································· 10
16) Adjusting the feed dog ··········································································································· 10
17) Adjusting the needle bar height ······························································································ 11
18) Adjusting the gap between the needle and the rotary hook tip ················································· 12
19) Adjusting of the needle and the hook timing ········································································· 12
20) Hook protection ····················································································································· 13
21) Adjusting the needle and feed mechanism timing ··································································· 13
22) Bobbin case lifter ·················································································································· 14
23) Adjusting the presser foot height ···························································································· 15
24) Adjusting the alternating presser foot movement amout ························································· 15
25) Adjusting the presser foot timing ························································································· 16
26) Driving knife adjustment ······································································································· 17
27) Adjusting the thread trimming timing ···················································································· 17
28) Adjusting the fixed knife position and bobbin thread clamping ··············································· 18
29) Safety clutch ·························································································································· 19
PARTS CATALOG ··························································································································· 20
1. PRECAUTIONS BEFORE STARTING OPERATION
1) Safety precautions
(1) When turning the power on, keep your hands and fingers away from the area around/under the needle
and the area around the pulley.
(2) Power must be turned off when the machine is not used, or when the operator leaves his/her seat.
(3) The power must be turned off before tilting the machine head, installing or adjusting the machine, or
when replacing.
(4) Avoid placing fingers, hairs, bars etc. nears the pulley, bobbin winder pulley, when the machine is
operation. Injury could result.
(5) Do not insert fingers into the thread take-up cover, under/round the needle, or pulley when the
machine is in operation.
(6) If mini motor cover, finger guard, and/or eye guard are installed, do not operate the machine without
these safety devices.
2) Precaution before starting operation
(1) If the machine's oil pan has an oil sump, never operate the machine before filling it.
(2) If the machine is lubricated by a drop oiler, never operate the machine before lubricating.
(3) When a new sewing machine is first turned on, verify the rotational direction of the pulley with the
power on. (The pulley should rotate counterclockwise when viewed from the pulley.)
(4) Verify the voltage and (single or three) phase with those given on the machine nameplate.
3) Precaution for Operating Conditions
(1) Avoid using the machine at abnormally high temperature (35℃ or higher) or low temperatures (5℃
or lower). Otherwise, machine failure may result.
(2) Avoid using the machine in dusty conditions. Avoid using the machine in areas where too much
electrical noise, resulted from the high-frequency welder and others is generated
2. SPECIFICATIONS
Item GC24688-2-D GC24688-1LD GC24688-1RD
Max. Speed 2400rpm
Stitch length 0 to 9mm
Needle bar stroke 34mm
Presser foot
clearance
Rotating hook Large vertical hook (1.6 times)
Needle DP×17 #18-#25
Presser foot alternation 1-7mm
By hand 9 mm
By knee 16 mm
Needle gauge (mm) 8(Standard),10,12 ───
Auto presser foot lifter Pneumatic
Oil lubrication method Automatic lubrication
Motor 750W sevor motor
— 1 —
3. PREPARATION BEFORE STARTING TO OPERATE
1) Connection of control box
If the machine which customer bought is not wholly assembled, the customer should connection the
electrical wires and the air pipes by themselves. Shows as the Fig.1 and Fig.2
Fig. 1 Fig. 2
There are same connectors which need to connect to the machine from the control box:
A: machine function input , connect to the PCB board on the machine arm.
B: pass the valve signal from the PCB board to the magnet valve board.
C: needle position monitor input ,connect to the monitor on the machine arm.
D: operation panel input ,connect to the panel.
E: operation pedal input, connect to the pedal.
If there is any problems during connecting wires, please check the instruction book of HO HSING control box.
NOTICE: all the connects is uni que with e ach other ,and if they can’t match it ,please check whether you get the
right one.
2)Connection of pneumatic parts
The pneumatic parts of the machine are controled by the magenet valves which assembled on the setting
board, and the position where the setting board be assembled under the machine table should be decided by the
length of the wires and the air pipes.
The pneumatic parts are composed by the filter g ,the solenoid valves a~f and the cylinders they control
The method of pneumatic parts connecting have been showed by Fig.3:
— 2 —
Fig.3
Here are the functions of the solenoid valves:
a: thread cutting b: thread tension c: pr ess foot alternation d: material guider(just for double needle)
e: back tacking f: press foot lift
The pressed air come from air compressor go to the input join 7,after be filtered,the output 8 and 9 link to
the inputs of the solenoid valves as follow:
1:connect to 8,pressed air input 2:link to the cylinder of thread cutting (bidirectional)
3:link to the cylinder of thread tension 4:link to the cylinder of press foot alternation
5:link to the cylinder of material guider 6:connect to the joint 14 as the input of material guider
10:connect to 9 as input for press foot lift 11:connect to 12 as the input of back tacking.
13:plug 15&16:link to the cylinder of press foot lift (bidirectional)
17:link to the cylinder of back tacking
When connecting the air pipes, please check the instruction mark of the solenoid joints at the setting board.
3) Oil pan
Fig.4 Fig.5
— 3 —
The installation of the oil pan is showed as the fig.4 and fig.5:
(1) Install the oil pan 3 to the underside of the worktable 1 in the place shown in the illustration using the
nails 2.
(2) From front view, the oil pan 3 to the side
is 60mm; from right view, the oil pan 3 to the side
is 80mm.
4) Operation panel
Installe the operation panel As Fig.6 shows :
(1) Install the operation panel 1 to the set
plate 2 with the three screws 3. Fig.6
(2) Install the set plate 2 to the back of the machine arm with the two screws 4.
5) Adjusting the needle stop position
(1) Adjusting the needle up stop position
When the sewing machine stops in the needle up stop
position (the stop position of trimming) and the treadle is
pressed back, the red mark on the pulley should be
consistent with the mark on the belt cover A. Adjust as
follows by Fi g.7:
a. Turn off the power switch.
b. Loosen the screw 4, and then remove the cover 3.
c. When the red mark stops in a position over the
mark on the belt cover, the needle up stop position disc 1
should be turned in the opposite direction as the direction Fig.7
of machine pulley rotation. When the red mark stops in a position under the mark on the belt cover, Turn the
disc 1 in the same direction as the pulley rotation direction.
(2) Adjusting the needle down stop position
When the sewing machine stops in the needle down stop position, the black mark on the pulley should be
consistent with the mark on the belt cover A. Adjust as follows:
a. Turn off the power switch.
b. When the black mark stops in a position over the mark on the belt cover, the needle down stop position
disc 2 should be turned in the opposite direction as the direction of machine pulley rotation. When the black
— 4 —
mark stops in a position under the mark on the belt cover, Turn the disc 2 in the same direction as the pulley
rotation direction.
c. After adjusting, install the cover 3, with screw 4.
Note: There is no need to loose the screw 5, when turning the discs.
4. HOW TO USE THE MACHINE
1) Threading
Raise the thread take-up lever to its highest position and pass the upper thread in the following order.
Fig.8 Fig.9
2) Adjusting of the thread regulator
The thread regulator 9 of Fig.8 ( 8 of Fig 9)regulates the amount of needle thread necessary for stitch
formation. The setting depends on the following factors: material thickness, yarn characterisation and stitch
length.
The thread regulator is fitted with slots for this purpose. Moving in the “+”direction increases the quantity
of needle thread; Moving in the “-”direction reduces the quantity of needle thread.
3) Adjusting of upper thread tension
Fig.10
The thread tension should be as low as possible. The crossover point should be in the center of the material.
Upper thread tension can be adjusted by thread tension nut 4 and 5 (see Fig.8 and Fig.9). Turn the thread tension
nut clockwise to increase the needle thread tension. Turn the thread tension nut counter-clockwise to decrease
the needle thread tension.
— 5 —
4) Winding the lower thread
Winding the lower thread as Fig.11 shows :
(1) Place the bobbin on the bobbin winder shaft.
(2) Pa ss the thread for winding thread as shown, and wind
the end of the thread clockwise around the bobbin several
times.
(3) Push the bobbin presser 1 toward the bobbin.
(4) The operation will automatically stop when winding is
completed. The amount of thread wound onto the bobbin
should be at 80% of the maximum bobbin capacity.
(5) After the thread has been wound on, remove the bobbin
and cut the thread with the thread-trimming knife
Fig.11
5) Threading the lower thread
Fig.12
(1) Removing the empty looper-thread bobbin, be showed on Fig.12
Raise the setting foot, open shuttle cover 3 ,then ,raise bobbin-housing flap 1 and remove upper part of
bobbin-housing 2.So,you can remove empty looper-thread bobbin.
(2) Threading looper thread
Full bobbin 4 in the upper part of bobbin-housing 2 (When the thread is unwound the bobbin must rotate in
the opposite direction (see arrow),then ,drew looper thread through slit 5 beneath tensioning spring 6.
6) Adjusting the lower-thread tension
Open the shuttle cover first and adjust the tensioning spring 6 with regulating scre w 5.If want to increase
looper-thread tension, turn screw 5 clockwise and if want to decrease looper-thread tension, please turn screw 5
counter clockwise. After the adjustment ,close the shuttle cover.
— 6 —
Caution: The looper-thread tension may only be adjusted with the sewing machine switched off.
7) Installing the needle
Note: Before attach needle, be sure to turn off the power.
As showed on Fig.13
1) Turn the balance wheel by hand to raise the needle bar
1 to its highest position;
2) Loosen the needle clamping screw 3；
3) Hold the needles with the long groove face to the
bobbin case of the same side , and insert it as deeply as it
will go into the needle clamping holes.
4) Tighten the needle clamping screw3.
Fig.13
8) Alternating presser foot movement amount
The alternating movement amount for the inner presser foot
and the outer presser foot can be adjusted within the range of 1-7
mm using the alternating presser foot movement dial 1. Turn the
alternating presser foot movement dial 1 clockwise or
counterclockwise to align the mark. (MIN. A, B, C, D, E, F
MAX. ) When the alternating movement change from MIN to
MAX, the sewing speed will turn form 2000 rpm to 1700 rpm
synchronously. Fig.14
9) Adjusting the presser foot pressure
Look at Fig.15,
The presser foot pressure should be set as weak as
possible, but strong enough so that the material can’t
slip out. If the presser-adjusting dial 1 is turned
clockwise, the presser foot pressure will become
stronger, and if it is turned counterclockwise, the
pressure will become weaker.
Fig.15
— 7 —
10) Adjusting the stitch length
The feed adjustment dials 2 can be used to set stitch length. (See Fig.15) The sewing machine will switch
between the two stitch lengths each time the stitch length change switch is pressed.
11) Using the manual switches
Be showed by Fig.16:
(1) Quick reverse switch
Back tacking is carried out during
sewing only while the switch 1 is
being pressed.
(2) Needle up or down switch
If the switch 2 is pressed, The
needle will move up to the needle up
stop position from down stop
position or move down to the needle
down stop position from up stop
position.
(3) Auto back tacking select switch Fig.16
If the switch 3 is pressed when either start back tacking or end back tacking has been set to ON at the
operation panel, back tacking is canceled for the first time only. Furthermore, if the switch 3 is pressed
when neither starting nor end back tacking has been set, back tacking is carried out for the first time only.
(4) Alternating presser foot movement change switch
The sewing machine can be switched between two different alternating presser foot movement amounts
each time when the switch 4 is pressed.
(5) Presser foot guider
The switch controls the cylinder of the presser foot guider and the status changed by each press of the
buttom. OFF: Presser foot guider turn off; ON: Presser foot guider on.
(6) Stitch counter switch
The orange light on the switch will flash and the machine will stop when the bobbin thread is used up.
Push the switch one more time after change the bobbin. The sewing machine cannot run before the switch
be pushed one more time. The stitch count should be set according to the stitch length and the count of the
bobbin thread. （it is special order parts）
Notice: the switch is not work until the correlative functions of the control box are set. The functions please read
the parameter 42, 43, 44 in the servo motor user manual.
— 8 —
12) Cleaning
(1) The area around the feed dog and the hook should be cleaned every day.
(2) Remove any thread scraps from inside the rotary hook.
(3) Keep the control box clean.
13) Lubrication
(1) Check the oil level at the sight glass 2 of Fig.17 every
week. If the oil is not enough, remove oil-filling screw 1
and pour in oil. Check oil level at sight glass 2. The oil
level must be between “EMPTY” and “FULL”. Replace
oil-filling screw 1. After running for 500 hours since
buying the new sewing machine, the oil must be changed.
Then change the oil every two years.
Fig.17
(2) Lubricating wicks and felt (see the Fig.19)
a. The wick 1 leading from the oil sump to the oscillating crank 4
must be fixed between the groove 2 in the arm and the spring 3
of the recirculation wick.
b. When the oil satchel is changed, the flock side should be faced
to connecting plate 10. The oil wick 7 and 8 should be set
between the oil satchel 9 and plate 8.
(3) Checking the lubrication oil Fig.18
Turn on the power switch. Depress the treadle gently and check that the oil level rises in the oil sight glass.
Fig.19
— 9 —
14) Adjusting the trailing length after thread trimming
Look at Fig.20: adjust by turning the pre-tensioner . If the tension of
the pre-tension is increased, the lengths of the threads trailing
from the needle tips will be reduced; if the tension is reduced, the
lengths will be increased.
Fig.20
15) Back tacking
When the reverse lever 1 or the quick reverse
switch is pressed during sewing, the feed direction
will be reversed. When it is released, the feed
direction will return to normal.(Fig.21)
Fig.21
16) Adjusting the feed dog
Fig.22
— 10 —
Caution: Check and adjust height of the feed-dog only when sewing machine is switched off.
The checking and correction are showed by Fig.22
(1)Standard checking
The highest position of feed-dog 1 must be 1.2mm(approx. one tooth depth) above the throat plate level.
Set stitch length”0”(Turn button counter-clockwise as far as it will go).Then, turn handwheel until feed-dog 1
has reached its highest position, check the height of feed-dog 1 above throat plate level 2
(2)Correction
Set stitch length “0”,loosen clamping screw 4 at crank 3, and twist crank 3 in such a way that the highest
position of feed-dog 1 is 1.2mm above throat plate 2,then tighten clamping screw 4 at last.
Attention: crank 3 must not be shifted axially when being turned.
Fig.23
17) Adjusting the needle bar height
Be showed by Fig.23:
In looping stroke position the hook tip must be at the level of the middle of the needle hollow groove 3 .
When the position is not correct ,follow the step below :
(1) Remove the face plate.
(2) Set the feed adjustment dials to “0”.
(3) Turn the pulley to set the needle bar 2 to its lowest position.
(4) Loosen the screw 1 and then move the needle bar 2 up and down to adjust so that the hook tip is at the
level of the middle of the needle.
(5) Tighten the screw 1, install the face plate.
— 11 —
18) Adjusting the gap between the needle and the rotary hook tip
Fig.24
Look at Fig.24 and Fig.25:
The gap between the needle and the rotary hook tip 6 is 0.1 mm.
check the position of the hook tip and the needle hollow groove ,if the
position is not correct with the requirement ,adjust it as follow:
(1) Loosen the screws 2 (for left hook) screw 4(for right hook) of the
throat plate.
(2) Loosen fastening screw 3(for left hook), fastening screw 5(for
right hook) of the hook support.
(3) Shift hook support correspondingly.
(4) Tighten the screws 3,5 and 2,4. Fig.25
19) Adjusting of the needle and the hook timing
Look at Fig.26
(1) Set the stitch length to “0”.
(2) Open the shuttle cover.
(3) Overturn the arm.
(4) Loosen the screw 1
(5) Turn the machine pulley to raise the needle bar
from its low position to the point that the needle rises
2.4 mm.
(6) Turn the rotary hook to align the rotary hook tip
with the center of the needle. Fig.26
(7) Tighten the screw 1.
— 12 —
20) Hook protection
Fig.27
Be showed by Fig.27,in looping stroke position the needle must abut on the hook protection 1 without
being displaced.Move needle in looping stroke position by pulley. In looping stroke position the hook tip 4 is at
the level of the middle of the needle. Press needle against hook protection 1 manually. The needle should not
touch the hook tip.the hook protection 1 chould be adjusted by screw 3.
21) Adjusting the needle and feed mechanism timing
(1) Horizontal feed direction (showed by Fig.28)
Set the feed adjustment dials to the maximum settings. Then turn the machine pulley until the bobbin tip
catches the thread (when the needle is 2.4mm above the lowest position) The needle and the feed dog do not
move even when the reverse lever is moved up and down at this time.
a. Remove the bed upper cover 1.
b. Set the feed adjustment dial to the maximum settings.
c. Loosen the two screws 2.
d. Turn the machine pulley until the needle is at its thread catching position.
e. Turn the lower feed cam 3 gradually until it is at the position where the needle and the feed dog do not
move even when the reverse lever is moved up and down.
f. Tighten the two screws 2.
(2) Vertical feed direction(showed by Fig.29)
Fig.28 Fig.29
— 13 —
Set the feed adjustment dials t o t he minimum se ttings. T hen adjus t as follows so that the feed dog 1 is at its
highest position (1.2mm above the top of the needle plate 2) when the needle bar is at its lowest position.
a. Loosen the two screws 3
b. Turn the machine pulley to set the needle bar to its lowest position.
c. Turn feed cam 4 to align the point 5 of feed cam 4 with the centerline of feed rod 6
d. Tighten the screws 3
22) Bobbin case lifter
Fig.30
Look at Fig.30 and Fig.31, the thread lever must pull the needle thread over the
bobbin case through gap 7 of the throat plate1.
At the moment of the thread slipping through lifting finger 3 lifts bobbin case
2.Due to the unhindered thread passage the desired seam pattern is achieved with the
lowest possible thread tension.
The lifting finger 3 is controlled via the eccentric in the hook shaft and the control
Fig.31 block 4.
Wrong adjustments may cause thread breakage, loops at the bottom side of the material and loud noise.
Checking: Lifting finger 3 must lift bobbin case 2 in such a way that the thread can slip laterally between bobbin
case lug 6 and the gap of the throat plate without being hindered.
When bobbin case 2 is lifted ,the distance X between holding lug 6 and the gap of the throat plate must
correspond to the thickness of the sewing thread. Sew some stitches manually, then check the distance x at the
moment of the bobbin case lifting.
Adjustment: Screw off cover of the hook support, loosen clamping screw 5 at the control block 4,then,twist
lifting finger 3 in such a wa y that the clearance in the lifting finger remains small. At last, tighten clamping
screw 5 and screw on cover of the hook support.
If the lifting course is too small, it will no unhindered thread passage, if the lif ting course is too small, it
will cause loud noise and the bobbin case 5 will flung against the other side of the throat plate gap 7.
— 14 —
23) Adjusting the presser foot height(Fig.32)
The standard height of the outer presser foot 7 is 9 mm when it is raised by the presser lifter bar 1.
(1) Remove the belt cover.
(2) Loosen the presser adjusting screw, to release the presser foot pressure.
(3) Raise the presser lifters bar 1 and then loosen the screw 3.
(4) Move the outer presser bar up or down to adjust so that the height of the outer presser foot 7 is 9 mm.
(5) While the stopper pin 6 is touching against the notch B in the presser foot lifter connection 5 and while
pushing the presser lifter shaft so that there is no play in the thrust direction, tighten the screw 2.
(6) Turn the presser adjusting screw to adjust the presser foot pressure.
(7) Install the belt guards.
Fig.32
24) Adjusting the alternating presser foot movement amount(Fig.33&Fig.34)
Fig.33
Maximum alternating presser foot movement amount. Carry out the following adjustment to set the maximum
alternating movement amounts for the inner presser foot 1 and outer presser foot 2 to the maximum of 7 mm.
— 15 —
a. Remove the upper plate.
b. Remove the adjusting bracket 3.
c. Loosen screw 5 of adjusting bracket collar 4.
d. Adjust the adjusting bracket collar 4. If the adjusting
bracket collar 4 is be installed at the highest position, the
alternating presser foot movement amount is 1-6mm. If it is at the
lowest position, the alternating presser foot movement amount is
1-7mm.
e. Tighten the screw 5.
f. Install the adjusting bracket 3.
g. Loosen the bolt 6 and turn connecting lever 7 to adjust so
that the distance from the outer edge of the arm to the outer edge
of the pin 7 is 78 mm at this time. Then tighten
the bolt 6.(When installing the upper plate, set the alternating Fig.34
presser foot movements dial to the “min.” position.)
25) Adjusting the presser foot timing(Fig.35)
Fig.35
When the presser feet are lowered and the machine pulley is turned toward the user. The inner presser foot
should touch the feed dog before the needle arrives at the feed dog. Then when the needle lifts up, the tip of the
needle should move away from the feed dog before the inner presser foot moves away.
(1) Remove the upper cover 4.
(2) Loosen the two screws 1.
(3) Turn the machine pulley until the needle tip and the feed dog’s up face is the same plane.
(4) Turn inner presser cam2 to adjust so that the point of inner presser cam is facing straight up.
(5) Tight the screws 1.
(6) When installing the upper plate 4, set the alternating presser foot movement dial to the “MIN.” position.
— 16 —
26) Driving knife adjustment
In resting position the rear edge of the driving knife should be flush with the front edge of the counter-knife,
which have been showed by Fig.36.
Fig.36
The fixed knife should abut on the thread pulling knife along its total width.
The pivoting driving knife should abut on the fixed knife after
approx.1/3 of its width.
The driving knife must not collide with the bobbin case.(Fig.37)
The clearance between the lower blade edge of the driving
knife a and the lower surface of the inner rotary hook b should
be 0.3-0.4mm.. Fig.37
Checking :
In Fig.36,loosen two screws 1 for adjusting the resting position of the driving knife and adjust the knife
according to the standard, then tighten screws 1.
ATTENTION:
Check the axial clearance of the knife shaft when
tightening the screws 1.The driving knife must be easily
movable and the axial clearance as low as possible .
27) Adjusting the thread trimming timing(Fig.38)
Checking: The moment of knife swiveling is fixed by
the position of the cam 2, When the thread lever is in position
“up”, the rolle r 7 should abut on the highest point of the cam
2
The roller should not touch the cam while sewing. The
distance between roller and cam should amount to 0.1mm. Fig.38
— 17 —
Adjustment: When adjust roller to cam, first, loosen screw 5 for adjusting the distance between roller and
cam ,then twist piston rod 6 in order to adjust the distance, at last ,tighten screw 5.
Turn cam adjustment: Loosen screw 1,3 and 4 at the cam, then, twist cam 2 in such a way that the roller abut
on the highest point of the cam when the thread lever is in position “up”, at last ,tighten screws 1,3 and 4 again.
28) Adjusting the fixed knife position and bobbin thread clamping(Fig.39)
Fig.39
Checking:
The clamping spring 5 has the function to hold the cut bobbin thread in order to avoid skipped stitches at the
seam beginning.
Fixed knife 4 and driving knife 6 must be in parallel position standing under a slight cutting pressure.
Parallel position correction
Loosen screw 3 slightly for adjusting the parallel position of thread pulling knife 6 and counter-knife 4,then
change counter-knife 4 by setting the screws 2 in such a way that the edges of thread pulling knife and
counter-knife are in parallel position. Tighten screw 3 at last.
Cutting pressur e adjust m e nt
The knives should guarantee a safe cut at the lowest possible pressure of the counter-knife against the
thread pulling knife. This is normally the case when the edge of the counter-knife just touches the thread pulling
knife with a knife overlapping of 1/3.
Loosen screws1,then turn counter-knife support in such a way that the condition is fulfilled, at las t ,tighten
screw 1.
Clamping adjustment
Slightly bend the bobbin thread clamp for correcting the clamping and make a test cut by hand and check
the thread clamping.
— 18 —
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