Method of measuring length of lap joint between two sheets of ma

Details Method of measuring length of lap joint between two sheets of ma Method of measuring length of lap joint between two sheets of ma

1992-05-18

1993-12-14

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 35, 156353, B32B 3100

Patent

active

052698599

ABSTRACT:
A method of measuring the length of a lap joint between sheets of material comprises the steps of transporting the sheets over a first roll and under a second roll. The rolls are a fixed distance apart. A first signal is generated when a second end of a first sheet passes a first measuring point which is located above the first roll. A second signal is generated when a first end of the second sheet passes a second measuring point which is located under the second roll. The number of revolutions of the first roll between the first and second signal are counted by a rotary encoder associated with the first roll. By comparing the actual number of pulses counted by the rotary encoder with a reference number of pulses which is determined by the number of the rotations of the first roll necessary to transport a given point from the measuring point above the first roll to the measuring point below the second roll, a length of a lap joint can be calculated. The calculation requires the subtracting of the actual number of pulses from the reference number of pulses, and converting the difference in pulses to a length measurement. An apparatus for carrying out the method comprises first, second and third rolls. At least one of the rolls has a rotary encoder associated therewith. A first sensor is located above the first roll and a second sensor is located below the second roll.

REFERENCES:
patent: 4236538 (1980-12-01), Foster et al.
patent: 4238261 (1980-12-01), Tetro
patent: 4343667 (1982-08-01), Hollis
patent: 5045134 (1991-09-01), Schenker et al.
patent: 5085719 (1992-02-01), Eck

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