Machine for the preparation of packs of articles of a pre-determined weight

Claim 1

For use in a machine having a plurality of feed stations at which individual pack units are supplied to the machine, a feeding mechanism for providing selective shifting of said pack units away from said feed stations, said feeding mechanism comprising: (a) a plurality of pack transporting conveyor mechanisms for receiving pack units from said feed stations, each of said conveyor mechanisms comprising stationary carrier bars and movable transfer bars, said transfer bars being movable vertically and horizontally relative to said carrier bars; and (b) a drive mechanism including a first drive system connected to all of said transfer bars for establishing a continuous, vertical reciprocating component of movement of all of said transfer bars, said first drive system including a first vertically reciprocable shaft, and a second drive system connected to all of said transfer bars for independently establishing a horizontal reciprocating component of movement of the transfer bars at selected ones of the conveyor mechanisms, said second drive system including a second shaft concentric with said first shaft, said second shaft being capable of rotary movement relative to said first shaft to provide the horizontal reciprocating component of movement at selected ones of the conveyor mechanisms, said first and second drive systems operating in synchronism to establish a pack unit-shifting elliptical movement of transfer bars only at selected conveyor mechanisms.