Measuring equipment

A sheet material thickness measuring apparatus having a measuring station defining a path for sheet material, said measuring station comprising:

• two pairs of material transport members, said transport members having sheet material guiding peripheral parts movable in the direction of material travel, said pairs of transport members being spaced apart in a direction transverse to the said path, and each pair being opposite each other on either side of said path;
• and
• transducer means positioned between said pairs of material transport members and comprising:
• a fixed sensory element at said measuring station on one side of said path;
• and
• a second sensory element at said measuring station on the other side of said path and opposite said first sensory element and being adapted to be moved away from said fixed sensory element upon the passage of sheet material along said path, the amount of such movement being dependent on the thickness of said sheet material;
• said transducer means being adapted to propagate an energy field between said sensory elements and give an output corresponding to the change in said energy field caused by the relative movement of said sensory elements upon passage of said sheet material, both said sensory elements bearing directly on said sheet material during its presence between said sensory elements.