恒力弹簧支吊架是一种在限定位移内对被支吊物施以恒定张力的装置。
Constant force spring hanger is a device which puts invariable tension on the thing it hangs in limited displacement.
包装机械在收放卷过程中，卷材卷筒直径的变化会引起张力的变化，而恒定张力是保证产品质量的关键。
Tension varies with changing of the diameter of coiling block in winding and unwinding processes of packaging machinery. Constant tension is the key to guarantee the product.
在15世纪早期，人们发明了螺旋弹簧或均力圆锥轮，尽管它的主弹簧的张力不断变化，但仍能对计时装置的齿轮保持恒定的力。
In the early 1400s came the invention of the coiled spring or fusee which maintained constant force to the gear wheels of the timekeeper despite the changing tension of its mainspring.
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