Two meshing spur gears 1 and 5 rotate about fixed axes A and B. Roller 3 rotates about fixed axis E. Flexible link 2 has springs 4 at its ends and is attached at points C and D to gears 1 and 5. Link 2 runs over roller 3. When gear 1 rotates continuously in one direction, roller 3 oscillates. Springs 4 maintain constant tension of flexible link 2.
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