Sewing device with an upper thread tension adjustment device

Abstract

The invention provides a sewing device with an upper thread tension adjustment device. When operating a thread-gripping dial (dial), the operation quantity of the thread-gripping dial is more than one ring, the torsional moment change of the dial operation is smooth, the cost is also low and during the assembly process, the position in the upper thread tension adjustment range is easily finely tuned. A tension representation part (17) is arranged on a tension setting nut (16) screwed with an external thread part (11a) of an axle 911) and a change-over mechanism (8) for changing the rotation of the thread-gripping dial (19) into the screwed movement is formed by the tension setting nut (16) and the thread-gripping dial (19). A thread-gripping slice (12) at another end of the axle (11) and another thread-gripping slice (13) are used for gripping the upper thread (4) and the upper thread tension adjustment device (10) with a thread-gripping spring (15) and an operation stable spring (18)is fixed on a device foundation (2) and an indication groove (3a) is arranged on a shell (3) of the sewing device.

Description

technical field [0001] The present invention relates to a sewing machine provided with a needle thread tension adjusting device for adjusting the tension of the needle thread. Background technique [0002] As a sewing machine with an existing needle thread tension adjustment device, such as Figure 14 As shown, the following sewing machine 100 (partial view of the sewing machine) is disclosed: it is fixed with a thread clamp 110 (upper thread tension adjustment device) on the sewing machine base 101 by screws 103, so that the operation dial 117 of the thread clamp 110 The case 102 is provided so that a part protrudes from the opening 102a of the cover 102 (see Patent Document 1). [0003] Figure 15 It is an explanatory diagram of a conventional thread gripper 110 . Such as Figure 15 As shown, the thread tensioner 110 fixes one end of the thread tension shaft 112 provided with the lead screw portion 112 a on the thread tension plate 111 . From the other end of the threa...

AI Technical Summary

Problems solved by technology

However, since the sewing machine 100 does not have such a fine-tuning function, it becomes difficult to fine-tune the position where the needle thread tension adjustment range is determined.

[0013] Furthermore, according to Patent Document 2, since expensive components such as the thread tension driving gear, the thread tension adjustment gear, the intermediate gear, and the timing belt must be provided, and the structure is also complicated, there is a problem that the cost of the yarn tension adjustment device becomes high.

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