Orange plate is pivoted on a link of the chain and always kept horizontal thanks to the interaction between its 3 pins (or rollers) at back side and slots of stationary guide.
Several plates can be arranged along the chain length.
For simplicity the measure to keep the frames steadily during motion is not shown.
This concept can be applied for other shapes of the chain drive such as:
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STEP files of this video:
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Inventor files of this video:
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