A towable vertical stacking bale accumulator features angle-adjustableroller beds on an obliquely oriented trailer frame whereby a rearwardlydecliningslope of the rollers gravitationally conveys individual bales from the balerto astacking station at the rear of the trailer frame, where an automaticallycontrolledgate provides a stop for retaining the bales until either a full stack iscompiled or anerror is detected. Spring loaded bale lifters feature concave undersides toencourage retraction of same as they are lowered down the sides of a newlyarrivedbale, and carry hanging bale guides that prevent the incoming bales fromovershooting sides of the roller bed. Lift frames on which the bale liftersare carriedare raised and lowered by hydraulically driven lift arms, and are furtherstabilized byengagement of lift frame followers with guide members of upright supportstructuresprovided on opposing sides of the roller bed.
