Cigarette Filter Rod Feed Mechanism

What is this patent about?

'775 is related to the field of automated filter rod handling, specifically addressing the problem of reliably feeding filter rods from a hopper into the flutes of a rotating drum in a cigarette filter manufacturing machine. The background involves pneumatic delivery of rods into the hopper, and a need to maintain a consistent flow to avoid machine downtime.

The underlying idea behind '775 is to use a horizontal row of reciprocating agitator bars within the hopper to promote even distribution and flow of filter rods. These bars, positioned above the pneumatic feed inlet, prevent the rods from clumping or tilting, ensuring a consistent supply to the fluted drum below.

The claims of '775 focus on a filter rod feed comprising a fluted drum, a hopper for feeding filter rods into the drum's flutes, a pneumatic delivery system for supplying rods to the hopper, and an agitator. The agitator is characterized by a substantially horizontal row of laterally spaced bars within the hopper, parallel to the filter rods, and positioned at or above the pneumatic feed inlet. The arrangement is designed to promote even flow of rods both upwards and downwards between the bars.

In practice, the agitator bars ensure that the filter rods remain loose and mobile, particularly in the area above the fluted drum. The slow reciprocation of the bars prevents the rods from becoming skewed or tilted, which is especially important when using a tray-feeding system as a backup to the pneumatic feed. This maintains a level surface of rods, optimizing the use of the tray's capacity as a buffer.

The design differentiates itself from prior solutions by actively managing the rod flow within the hopper using the reciprocating bars. This active agitation ensures a more consistent and reliable feed compared to passive systems, especially when switching between pneumatic and tray feeding. The specific placement and movement of the bars are key to preventing rod clumping and maintaining a uniform supply to the fluted drum, ultimately improving the efficiency of the filter manufacturing process. The refuser roller also plays a role in ensuring only properly aligned rods enter the flutes.