US PATENT SUBCLASS 493 / 19
.~.~.~.~ Sensing opposite edges of planar work

Current as of: June, 1999
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493 /   HD   MANUFACTURING CONTAINER OR TUBE FROM PAPER; OR OTHER MANUFACTURING FROM A SHEET OR WEB

3  DF  CONTROL MEANS ENERGIZED IN RESPONSE TO ACTIVATOR STIMULATED BY CONDITION SENSOR {5}
8  DF  .~ Responsive to work material, the product or means engaging the work material or the product {13}
17  DF  .~.~ By use of plural sensors {1}
18  DF  .~.~.~ Plural interrelated sensors {1}
19.~.~.~.~ Sensing opposite edges of planar work {1}
20  DF  .~.~.~.~.~> Opposite side edges

DEFINITION

Classification: 493/19

Sensing opposite edges of planar work:

(under subclass 18) Method or apparatus including detecting one of the margins of a sheet or web workpiece and detecting the margin directly across the workpiece.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18, for a first detector sensing a first wall of a container or a tubular blank and a second detector sensing an opposing wall.