Web tension monitor
OwnerEdward C. Bartlettinventor
Life of this patent
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Abstract
A web tension monitor in which the tension of a moving web passing over a guide roll is monitored by a sensing device positioned upon a cantilever-mounted support which is coupled to a shaft which carries the roll. Forces applied to the roll by the tensioned web passing over it are coupled to a fixed frame through the cantilever-mounted support by means of a pair of concentric rings between which bearing balls are disposed in confronting openings formed in both members at diametrically opposed points. Misalignment and expansion of machine components can be tolerated to a large degree without causing pre-loading of the sensing device.
Claims6
In a web tension monitor which includes at least a tension monitoring guide roll over which said web is movable, a frame, and shaft means for mounting said roll for rotation relative to said frame, a system for continuously monitoring the tension in said web comprising at least one housing having a base attached to said frame and having an open end formed therein, a strain member cantilever-mounted within said housing and extending in a direction away from said frame, at least one strain gauge mounted on said strain member, an electrical circuit connected to said strain gauge to indicate its output, a first ring extending from said strain member, a second ring at the end of said shaft means, said second ring surrounding said first ring, each of said rings having two diametrically opposed confronting openings formed therein, a bearing ball being disposed in each pair of confronting openings, whereby said two rings are coupled together, deflection of said web in response to web tension causing said shaft means to apply cantilever loading force to said strain member, the electrical characteristics and output of said strain gauge thereby being varied.
Dependencies are inferred from the claim text.