Measuring and testing – Dynamometers – Responsive to force
Patent
1988-03-15
1989-06-27
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to force
340668, 340677, G01L 510
Patent
active
048417840
ABSTRACT:
A device for monitoring the tension on a thread comprises a frame for retaining the thread; a leaf spring on the frame for bearing against the thread and being displaced thereby as a function of such tension; a generator, such as a permanent magnet on the leaf spring, for generating an electromagnetic field between the frame and the leaf spring which varies as a function of such displacement; a Hall effect sensor which senses such field and generates an output signal indicative of such tension; and an electronic system for receiving said output signal and indicating whether said output signal and thereby said thread tension is within a predetermined desirable range. The indication is made at least at a location in the vicinity of the frame where it can be seen by persons who are responsible for maintaining the correct thread tension, and may comprise a plurality of LEDs for indicating respectively when the thread tension is too high, too low, and at the correct level. A method and device are also disclosed wherein the AC component of the sensor output is detected, and compared against an upper limit voltage and a lower limit voltage to determine whether the AC component above the upper limit voltage or below the lower limit voltage, and a respective LED is lit to indicate whether the AC component and the thread tension is too low, too high, or within the desirable range.
REFERENCES:
patent: 3495454 (1970-02-01), Heimes
patent: 4000782 (1977-01-01), Finkelston
patent: 4597297 (1986-07-01), Smith
patent: 4720702 (1988-01-01), Martens
patent: 4759226 (1988-07-01), Leurer
FAG Kugelfischer Georg Schafer (KGaA)
Ruehl Charles A.
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