The number of moving parts will vary depending on the make and model of the pinsetter.
first automatic pinsetter was used by the bowl o drome bowling alley in mt. clemens mi. in app. 1951.
There is a Pinsetter, which is the mechancal device used to set and pick up the pins. I've never head of a bowling setter, however.
There are four machines at a bowling center. The big one is the pinsetter. It does three things: sets a new rack of pins onto the lane deck at the start of the frame, sweeps pins from the lane after each ball is thrown, and returns balls to the bowler. Next is the ball return. It lifts the ball from the return track to the ball rack, and holds balls not being played. Third is the scoring machine, which does what its name implies. And finally is the center control desk.
Gravity comes to mind as the pins FALL into place in the rack.
If you can knock all the pins down with one ball, that is a strike.
A pinsetter.
Behind the lane, there is a pinsetter that is fed pins and automatically stands them up in the places they should.
They either land on the pin deck, drop in the pit, or fall in the gutter. The pinsetter then picks up an pins left and the sweep dumps all the pins into the pit to be resorted into pinsetter for the next frame.
No the machine is made to hold up to 2 pounds
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A Brunswick A-2 pinsetter weighs approximately 1,800 pounds.