Jack JK-T781E Manual de usuario
JK-T781E series
technical parameters and models
Model JK-T781E JK-T782E JK-T783E JK-T781EK
Purpos (Textile, chemical fiber fabric )buttonhole`s
sewing lock
Knitting
Buttonhole length 22mm 33mm 40mm 22mm
Stitch width 2.5~4mm 2.5~5mm 2.5~5mm 2.5~4mm
Cutter length 6.4~19mm
(1/4”~3/4”)
6.4~25.4mm
(1/4”~1”)
6.4~31.7mm
(1/4”~1 1/4”)
6.4~19mm
(1/4”~3/4”)
Speed 100~3600rpm/min
Needle stroke 34.6mm
Presser foot height 10mm
Needle DP×5（#11~#14）
Refueling mode Automatic oiling
Sewing thickness 4mm
Needle count Factory equipped with 4 unitsG(225,83) J(190,100) L(170,110)
N(152,123)
Market has 8 units 54针~345针
First way：see the no. of 2 in the first picture, put the ruler like this between the Needle
plate and needle bar，move the position of needle bar until the distance between needle
bar and the ruler is 0. Adjust the hook to make the tip of the hook from the upper end of
the pinhole 1.6 ~ 1.8mm, tighten the screw of Rotary hooks to make that the distance
between two Tips of the hook is about 0.05 mm.
ruler, this part 14.2mm
1.2 adjust needle and hook
1.6~1.8mm
0.05mm
requirement for catching
thread
2.1、adjust the needle bar height
Second way:（observe the hook)，Install the needle to make the needle in the middle
of the pinhole, move the needle bar to the lowest point, observe and make the upper
edge of the pinhole not exceed the needle plate.
needle
plate
lowest
point,of the
needle
Front panel
of neele
plate
the middle
of the
pinhole
Second way: 1、Turn the handle，until the the pallet moves to the right baseline，
Turn the handwheel until the needle moves to the right baseline，during the period of
returning of the needle bar, adjust the Rotary tip util hooking above the pinhole，at
the the lowest plat.
2、Adjust the rotary hook positioning screw, util hook tip close to the needle, but not
hit the needle (zero distance).3、pls. note when the hook catchs thread, the rotary
hook needle plate must be close to the needle, but not squeezed(zero distance).
2.2、adjust needle and hook
the needle
moves to the
right baseline
hooking above
the pinhole
hook tip close
to the needle
requirement for
catching thread
3.0、adjust buttonhole width and stitching reference position
The movement of the needle is based on the right side of the needle swing. When
adjusting, please follow the following steps:
1、Baseline width adjustment: Turn screw 1 and align the baseline pointer to the desired
scale on the scale plate.2、Reinforce sewing width adjustment：Tighten screw 2 to align the
reinforcement pointer to the baseline pointer.3、Right baseline position: twist screw 3, adjust the
cutter to cut the screws when the right baseline is not cut.4、Left position of the baseline: When
screwing the screw 4 so that the blade does not have a left baseline, tighten the screw.
screw 1Baseline
pointer
Scale
plate
screw 2
Reinforce
pointer
screw 4
screw 3
4.0 adjust position of feeding control panel when work finished
◆If the control plate position is not correct, whenever you change the sewing size, the
knife will malfunction, the position of the presser foot will change, resulting in broken
needle, broken thread.
◆adjustment method: when stopping,make the scale line of plate align the middle
position of the roller pin screw. If the position is not correct, move the part A of the right
pic. to reaze this .
大盘刻线
control plate
Scale line of plate
Standard：This adjustment is same as 781D serie.
781E Machine
mode and Number Comparison
table
Mode
781E
782E
783E
781EK
Number
on dial
1/2
1
5/4
1/2
：
Method：
1. Pull out the part, put up the canning.
2. Loose the screw, let the pointer front to the number you need. （The number
should be same as length of cutter) Then tighten the screw。
18.0：Adjustment of the button hole length
Feeding Crank
Loose screw
Pointer
Notice：After change the number on dial, then
should change the presser foot similar as the
length of button hole.
Adjustment stardard: the distance between fixed knife and needle plate hole is 0.3-0.5mm.
Adjustment influence: if the distance between the fixed knife and the needle plate hole is too
close, the thread breakage will happen when you sew.
Adjustment method:
1.Lose the fixed knife fasten screw.
2. Adjust fixed knife, make the distance
between the fixed knife and the needle
plate hole to 0.3-0.5mm and then
fasten the screw.
19.0：Adjustment of the position of lower line fixed knife
fixed knife fasten screw
fixed
knife
Adjustment standard: When the machine is in the parked position (the presser foot is in the
decentralized state), the motor will automatically find the zero position, so that the mechanical lock
between the starting plate and the movement pin left 3mm gap.
29.0：The sensor chip of automatic foot-lift position adjustment
3mm Gap
Sports pin
Sensor chip
Sensor
The sensor chip is aligned with up-side of the stamp mark of sensor
Stamp mark
Larger
Smaller
Adjustment methods：
1. Loosen the setscrews and adjust the sensor chip up and down relative to the sensor. （Up to adjust sensor
chip, the gap becomes larger after booting to find the zero position, down to adjust the gap smaller.)
2.Re-boot to find zero position, verify the mechanical lock between the starting plate and the
movement pin left 3mm gap.
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