Method and apparatus for measuring web material wound on a reel

Details Method and apparatus for measuring web material wound on a reel Method and apparatus for measuring web material wound on a reel

1975-04-04

1977-01-04

Shaw, Gareth D.

Registers

Platform operated

Platform actuated traffic counters

235 92CA, 235 92CT, 235 92R, H03K 2118

Patent

active

040015521

ABSTRACT:
Method and apparatus for measuring the number of layers of a web material of known thickness wound on a storage or take-up reel. The method and apparatus are based on the principle that, at a relatively large radius, the loci of layers of a thin web wound on the reel approximate a family of concentric circles having radii respectively successively increasing by a length equal to the web thickness, t, whereby the difference in circumferences between adjacent web layers is substantially constant and equal to 2.pi.t. Tachometer pulses are generated in response to linear movement of the web and reset pulses are generated in response to rotation of the reel. The tachometer pulses, either prerecorded on a track of the web or generated by a code wheel rotating with the moving web, are spaced apart from each other by 2.pi.t. With that spacing, each layer of the web contains one pulse more than an immediately preceding layer. A digital circuit, responsive to the tachometer and reset pulses, generates data indicative of the layer number of any layer of the web and of position of the web within the layer without requiring numerical interpolation.

REFERENCES:
patent: 3538729 (1970-11-01), Sterrett, Jr.
patent: 3564219 (1971-02-01), Mutziger
patent: 3710084 (1973-01-01), Slagley et al.
patent: 3739276 (1973-06-01), Dornberger
patent: 3824694 (1974-07-01), Lesperance et al.
patent: 3834648 (1974-09-01), Rose, Jr. et al.
patent: 3898436 (1975-08-01), Pottebaum et al.

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