Jack JK-T781E Bedienungsanleitung

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

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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