| 摘要 |
<p>DEMAND LABEL TRANSFER WHEEL A label transfer wheel includes a cylindrical structure having an annular cavity extending into a side thereof; an axially extending hole engageable by a rotary drive; and two circular series of holes, each hole extending radially from the cylindrical surface of the structure to a cylindrical surface bounding the cavity. A plate rotatably coupled to the structure generally covers the cavity and includes a port adapted for connection to a vacuum source. The plate is coupled to a pair of devices located within the cavity, each of the devices having a polyurethane foam seal which is in abutment with the bottom boundary of the cavity and a section of the cylindrical surface bounding the cavity to provide, in combination with the plate, a fluid tight chamber coupling the port to arcuate sets of holes of the series of holes. The devices are movable with respect to each other to permit varying the size of the chamber and the number of holes communicating therewith. If the plate is held and the cylindrical structure is rotated a vacuum source coupled to the port will provide, via the chamber and holes communicating therewith, a vacuum pressure along an arcuate area coincident with the cylindrical surface and address labels may be transferred at any time from one end of the area to the other end of the area.</p> |
