Thread tension adjusting device

Abstract

The present disclosure discloses a thread tension adjusting device comprising a body, a tension rod, an elastic element and an adjusting knob. A thread passing eye for inputting a thread is arranged below the body. A tension wheel and a thread passing wheel are rotatably arranged on the body. An adjusting knob is used for adjusting a rotational speed of the tension wheel. The elastic element has one end connected to the body and another end connected to the tension rod. The thread tension adjusting device may ensure stability of tensioning and transmitting of the thread by cooperation between the tension rod and the tension wheel, and improve precision for thread tension adjusting by the adjusting knob. In addition, the thread tension adjusting device may monitor thread breakage by the tension detector, and ensure operating stability and safety of the thread tension adjusting device.

What is claimed is: 
     
         1 . A thread tension adjusting device, comprising:
 a body;   a thread passing wheel rotatably arranged on the body;   a tension wheel rotatably arranged on the body;   a tension rod, having one end rotatably connected to the body and another end provided with a thread outlet wheel;   an elastic element, having one end connected to the body and another end connected to the tension rod;   an adjusting knob for adjusting a rotational speed of the tension wheel;   wherein the thread passing wheel, the tension wheel and the thread outlet wheel are successively wound by one end of a thread.   
     
     
         2 . The thread tension adjusting device according to  claim 1 , wherein the elastic element is a spring, a support is fixedly arranged on the body, and the spring has one end fixedly arranged on the support and another end fixedly arranged on the tension rod. 
     
     
         3 . The thread tension adjusting device according to  claim 2 , wherein the support has a first branch and a second branch arranged thereon, an angle is formed between the first branch and the second branch, a first hole is arranged on the first branch, a second hole is arranged on the second branch, and the spring has one end fixedly connected to the first hole or the second hole. 
     
     
         4 . The thread tension adjusting device according to  claim 1 , wherein the thread tension adjusting device further comprises a limit knob for defining a rotational range of the tension rod, and the limit knob is arranged on the body. 
     
     
         5 . The thread tension adjusting device according to  claim 1 , wherein the thread tension adjusting device further comprises a wire jump preventer, and the wire jump preventer is fixedly on the body and arranged between the thread passing wheel and the tension wheel. 
     
     
         6 . The thread tension adjusting device according to  claim 1 , wherein the thread tension adjusting device further comprises an adjusting wheel, and the adjusting wheel is rotatably arranged on the body and arranged between the thread passing wheel and a thread passing eye. 
     
     
         7 . The thread tension adjusting device according to  claim 1 , wherein the adjusting wheel is a wool felt wheel. 
     
     
         8 . The thread tension adjusting device according to  claim 1 , wherein the thread tension adjusting device further comprises a position detector for detecting rotational position of the tension rod, and the position detector is fixedly arranged on the tension rod. 
     
     
         9 . The thread tension adjusting device according to  claim 8 , wherein the thread tension adjusting device further comprises a controller and a warning device, and the position detector is electrically connected to the controller and the warning device. 
     
     
         10 . The thread tension adjusting device according to  claim 1 , wherein the body further has a work indicating lamp arranged thereon.