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US 4,063,051 AGranted
Apparatus for detecting bumps in a web
AssigneeThe Standard Products Company
InventorsRobert W. Gundlach, Frederick W. Hudson
Life of this patent
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AssigneeThe Standard Products Company
InventorsRobert W. Gundlach, Frederick W. Hudson
Estimating the term…
Apparatus for detecting bumps in a web, such as are caused by double threads or knots in a web of fabric, as the web is advanced past the detecting apparatus, comprises a blade, preferably a plurality of partially overlapping blades, arranged across the web and riding on the web. Each blade comprises one element of a switch the other element of which is constituted of a contact member arranged above the blade a distance from the blade greater than the height of the bumps to be detected. The blade is sufficiently light and so mounted that when it is struck by a bump on the web, it bounces out of engagement with the web and contacts the contact member thus closing the switch which is in an electrical circuit. A deactuatable means for moving the web is operatively associated with the switch whereby closing of the switch deactuates said web moving means. A marking means for marking the web when the switch is closed may also be operatively associated with the switch. Similarly, an audible signal may be operatively associated with the switch.
Apparatus for detecting bumps in a soft, compressible web adapted to move relative to said apparatus, comprising at least one sensing member having an edge for riding on the web during said relative movement, means for supporting the sensing member with said edge oriented transversely of the direction of said movement, a contact member, means for supporting the contact member a distance above the sensing member greater than the height of the bumps to be detected, said contact member being contacted by said sensing member in response to the displacement of said sensing member by a bump on said moving web, the sensing member being of sufficiently low weight and so mounted that it will bear on the web sufficiently lightly so as not to substantially compress a bump on the web when engaged thereby and so as to bounce off a bump a distance sufficient to contact said contact member.
Dependencies are inferred from the claim text.