Bead feed unit and method
A bead delivery disk, system and method of delivering flavor beads to a tobacco rod or tow including a bead source, a bead delivery disk in communication with the bead source, including a central disk portion having front and back sides and a first central thickness, an inner annular rim around the central disk portion, the inner annular rim having a second thickness less than said first thickness, a series of pockets spaced around the inner annular rim and multiple vacuum transmission apertures located on one side of the disk, each aperture communicating with at least one of the pockets.
1. A bead delivery disk comprising:
a central disk portion having a front side, a back side and a first thickness;
an inner annular rim around the central disk portion, the inner annular rim between the front side and the back side and offset in a perpendicular direction from the front side and the back side, the inner annular rim having a second thickness less than the first thickness;
a plurality of pockets spaced around the inner annular rim;
an outer annular rim disposed around an outer periphery of the inner annular rim, the outer annular rim including,
a leading rim having a first height with respect to an outer periphery of the inner annular rim, and
a trailing rim having a second height with respect to the outer periphery of the inner annular rim, the second height different than the first height, each of the plurality of pockets disposed between the leading rim and the trailing rim; and
a plurality of apertures located on one side of the central disk portion, each of the plurality of apertures communicating with at least one of the plurality of pockets.
2. The bead delivery disk of claim 1 , wherein the plurality of apertures are located in a generally circular pattern around the back side of the central disk portion, radially inside of the inner annular rim.
3. The bead delivery disk of claim 1 , wherein the plurality of apertures are perforations on a surface of the back side which fluidly communicate with the plurality of pockets through passages inside the central disk portion.
4. The bead delivery disk of claim 1 , further comprising:
a semi-annular vacuum plenum affixed to the back side of the central disk portion covering the apertures and having one or more vacuum delivery ports provided therein.
5. The bead delivery disk of claim 4 , wherein an upper terminus of the vacuum plenum is located at about zero degrees on top of the back side of the central disk portion.
6. The bead delivery disk of claim 5 , further comprising:
a pressurized gas delivery means located at about 180 degrees relative to the top of the central disk portion.
7. The bead delivery disk of claim 1 , wherein the each of the plurality of pockets is sized to pick up and deliver a single bead.
8. The bead delivery disk of claim 1 ,
wherein the outer annular rim has a third thickness less than the second thickness.
9. The bead delivery disk of claim 8 , wherein beads to be picked up and delivered have a nominal diameter greater than the third thickness and less than the second thickness.
10. The bead delivery disk of claim 8 , wherein each of the plurality of pockets has a spherical seat formed on the inner annular rim between the leading rim and trailing rim of the outer annular rim, each seat communicating with a passage disposed within the central disk portion.
11. The bead delivery disk of claim 10 , wherein each passage communicates with a single aperture of the plurality of apertures.
12. The bead delivery disk of claim 10 , wherein
a center of a nominal bead is disposed a third height above an outer periphery of the inner annular rim when the nominal bead is seated in a pocket of the plurality of pockets,
the second height is greater than the third height, and
the first height is less than the third height.