Apparatus For Orientating And Feeding Rod-Like Objects

What is this patent about?

'812 is related to the field of orienting and feeding rod-like objects, specifically cigarettes, from a hopper into an orientation passage. The background involves tobacco wrapping apparatus that require cigarettes to be aligned and fed in a consistent orientation. A common problem is the 'bridge phenomenon,' where cigarettes jam at the entrance of the orientation passage, hindering the feeding process. Prior art solutions used agitator rollers that reciprocated, leading to mechanical complexity, vibration, and speed limitations.

The underlying idea behind '812 is to use a combination of agitator rollers rotating continuously in a coordinated manner to prevent jamming and ensure a smooth flow of rod-like objects into an orientation passage. The key insight is the use of a pair of entrance agitator rollers rotating in the same direction, combined with a central agitator roller rotating in the opposite direction, to create a circulating flow that keeps the objects in a 'floated condition,' preventing bridging.

The claims of '812 focus on an apparatus comprising a hopper, an orientation passage connected to the hopper, a pair of entrance agitator rollers located on opposite sides of the entrance opening of the orientation passage, and a central agitator roller located above the entrance agitator rollers. Crucially, the claims cover a rotating mechanism that rotates the entrance agitator rollers in the same direction and the central agitator roller in the opposite direction.

In practice, the entrance agitator rollers, rotating in the same direction, guide objects towards the entrance while preventing simultaneous entry of multiple objects. The central agitator roller, rotating in the opposite direction, creates a circulating flow in the lower region of the hopper, preventing the bridge phenomenon. The orientation passage itself is tapered, with the width decreasing from the entrance to the lower end. This tapered design initially allows the objects to move in a zigzag fashion, accommodating more objects per unit length and preventing gaps even if temporary jams occur.

This design differs from prior approaches that used reciprocating agitator rollers, which were mechanically complex and limited in speed. By using continuously rotating rollers, the mechanism is simplified, vibration and noise are reduced, and higher feeding speeds are achievable. The combination of the agitator roller arrangement and the tapered orientation passage ensures a reliable and smooth flow of rod-like objects, preventing both jamming and the formation of gaps that can lead to damage or misalignment.