| 摘要 |
In a wrapping machine that packages products by enveloping each one in a tubular wrapper with two edges united lengthwise and heat-sealed thus together, the integrity of the packaging is verified by a device comprising a feeler located at a given point along the wrapping line and offered in sliding contact to the advancing wrapper at an area coinciding with the junction between the edges and the tubular envelope. The feeler is loaded against a spring delivering a force of known intensity, and able consequently to hold a stable operating position as long as resistance is offered by the wrappers, but will find the gaps in any wrapper of which the edges have failed to unite successfully. The resulting movement of the feeler is sensed by a transducer.
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