well, first, after it ges to the back, it gets sent to space to an eletrice light through Nanotechnology laser beams, get's cleaned. comes back through a hole where hobo's live (you get lucky if you ball comes back) then it comes out the hole.
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There is a carpet or similar device that rolls and moves the ball to a hole towards one side of the back pit. There are mechanics that raise the ball to a higher position and bring it to a set of rails that uses gravity to roll the ball to the floor area by the approach. Another mechanical device raises the ball to the ball return which then ejects the ball to the area where the balls are easily accessed to use to throw again.
The device, manual or automated, is called the "ball return." Modern versions are often incorporated into the pinsetter devices that reset pins and clear the lanes.