B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
156/32
B65B 11/00 (2006.01)
Patent
CA 1200752
ABSTRACT OF THE DISCLOSURE A rotatable film wrapping apparatus for wrapping a load on a conveyor with an overwrap of stretched plastic film web, having a film web pre-stretching mechanism which is provided with a constant torque by a power assistance mechanism. The power assistance mechanism comprises a stationary ring adjacent a rotary ring on which the film roll and pre-stretch mechanism are mounted, and a friction roller on the rotary ring which contacts the stationary ring to transfer rotational energy to the pre-stretch device as the rotary ring rotates. The pre-strech mechanism comprises a downstream roller across which the film is drawn to the load at a speed which varies, and an upstream roller linked by gears to the downstream roller so that the upstream roller rotates, at a fixed fraction of the speed of the downstream roller to stretch film between the rollers. The energy of the friction roller is transferred through an adjustable constant torque device to the pre-stretch mechanism without controlling the speed of the pre-stretch mechanism, and since a constant torque is added to the pre-stretch mechanism, the the force on the film to the load can be substantially reduced while allowing the pre-stretch drive to speed up and slow down according to the film demand from corners or changing load size. This permits higher levels of stretch, faster payout speeds, and use of less uniform film than were thought possible previously. Relatively centered loads with minimum corner protrusion may be wrapped without the constant torque device by a proper selection of gears such that the downstream roller surface speed is driven slightly below the average relative surface speed of the load.
435449
Lancaster Patrick R. III
Lancaster William G.
Hirons & Rogers
Lancaster Patrick R. III
Lancaster William G.
LandOfFree
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