Jack JK-T781E User manual

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