Patent ID: 6932009

Claim:
A thread tension adjustment device of multi-needle sewing machine comprising: (a) a fixing rack fixed on a housing of the sewing machine; (b) multiple thread tension adjustment units mounted on the fixing rack, each thread tension adjustment unit including a frame body fixed on the fixing rack, multiple thread tension adjustment buttons being arranged on the frame body, each thread tension adjustment button serving to resiliently clamp a thread, a thread-loosening slide board being slidably disposed on each frame body, the thread-loosening slide board having multiple wedge sections each of which is aligned with a gap between a first and a second clamping trays of the thread tension adjustment button; and (c) a link pivotally connected with the thread-loosening slide boards for driving the thread-loosening slide boards to move the wedge sections thereof toward the corresponding thread tension adjustment buttons and insert the wedge sections into the gaps between first and second clamping trays of the thread tension adjustment buttons, whereby after the wedge sections of the thread-loosening slide boards are inserted into the gaps between the first and second clamping trays of the thread tension adjustment buttons, the gaps are enlarged to release the threads clamped by the thread tension adjustment buttons.