What is the reason that the automatic buckling machine does not pull the thread tightly and the thread is short after cutting?

(1) pull not tight line first to check the first clamp line work, if the clamping piece of floating plate and not adjusted, two clamping piece of floating situation, will result in tightening the line. Automatic button machine in the parking condition of the first clamping device clamping line piece undulation amount of 1mm, together with the machine in the running state of the clamping line piece is completely clamped situation (can not float up).

Adjustment: left and right adjustment of the floating plate, the first clamping device will be adjusted to the amount of undulation of the clamping piece 1 mm. It should be noted that if the amount of floating is too much, the formation of the sewing line failure, nail buckle is prone to loose (in fact, is not tight), floating amount is too small, will form the beginning of sewing the first needle when the thread is too short, caused by the offline.

(2) the 2nd clip thread amount of floating or floating time is too late, it will cause cutting the line after the thread is short; on the contrary, the moment too early to loosen the line, it will also happen that the thread is too long, the phenomenon of the brake line is not good. Standardized 2nd thread clamp floating phase that when the needle bar rises to 54 ~ 57mm, the 2nd thread clamp begins to float up (TQ × 1.44 ~ 47mm)

Adjustment method: Loosen the fixing nut of the 2nd bobbin winder stud and adjust with a screwdriver. The time for the thread clamp to float up will be when you pull the thread that passes through the 2nd thread clamp by hand and roll the belt disk, and when you feel the thread tension disappears, that is when the thread clamp piece starts to float up.