Apparatus for measuring the position of weft threads in a moving fabric web
First Claim
1. An apparatus for measuring the position of weft threads in a moving fabric web having a given width, comprising sensor head means, support means movably supporting said sensor head means for movement across said given width of said fabric web, drive means operatively connected to said sensor head means for effecting said movement, said sensor head means providing a first set of signals representing the weft thread deviation on one side of a longitudinal center line of said fabric web and a second set of signals representing the weft thread deviation on the other side of said center line, said apparatus further comprising signal evaluating means operatively connected to said sensor head means for comparing said first and second sets of signals to produce a control value.
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Accused Products
Abstract
The deviation of the weft threads in a fabric is ascertained to show the extent and angle of the deviation relative to a line extending at a right angle relative to the edge of a moving fabric web. For this purpose a sensor head or several sensor heads are movable across the web. Separate signals are produced for the left and right half of the web relative to a longitudinal center line of the web. A comparing unit compares the separate signals for forming a control value or signal.
34 Citations
8 Claims
- 1. An apparatus for measuring the position of weft threads in a moving fabric web having a given width, comprising sensor head means, support means movably supporting said sensor head means for movement across said given width of said fabric web, drive means operatively connected to said sensor head means for effecting said movement, said sensor head means providing a first set of signals representing the weft thread deviation on one side of a longitudinal center line of said fabric web and a second set of signals representing the weft thread deviation on the other side of said center line, said apparatus further comprising signal evaluating means operatively connected to said sensor head means for comparing said first and second sets of signals to produce a control value.
Specification