| 摘要 |
A labeler includes at least one bellows movable between extended and retracted positions. The bellows preferably includes a venturi member for applying or maintaining a vacuum to hold the label as the bellows is extended outwardly by positive pressure coupled to the bellows. The labeler preferably includes a positioner for advancing each bellows along a path of travel between a label pick-up position and a label application position, and a controller for controlling fluid flow to retract and extend the bellows as same is advanced along the path of travel. The bellows, in turn, preferably comprises a cap defining a distal end of the bellows for carrying the label and having at least one cap opening therein, a pleated sidewall connected to the cap and having at least one sidewall opening therein, and the venturi member. The venturi member preferably comprises a first seal adjacent the cap to define a first chamber in communication with the at least one cap opening, and a second seal positioned adjacent the first seal to define a second chamber in communication with the at least one sidewall opening. The venturi member also preferably includes a venturi body connected to the first and second seals and having a plurality of passageways therein for generating a low pressure in the first chamber and at the cap openings caused by a venturi effect as fluid flows from a proximal end of the bellows into the second chamber and out the sidewall openings.
|
