BRIGHT STARTS: The Comfort and Harmony(TM) Portable Swing, MODEL: probably it is: 7030 Whisper Quiet
The problem is : broken plastic gear wheel on the shaft axes.
The Comfort and Harmony(TM) Portable Swing surrounds your little one in snuggly comfort. The soft, removable duckling bolster is a perfect cozy support for the littlest infants. Featuring TrueSpeed(TM) Technology, our portable swing automatically recognizes your baby’s weight and adjusts the swing’s motion to maintain consistent, soothing swing speed even as your baby grows. Comfort Recline(TM) offers two distinct positions for rest and play. Six sweet melodies will help calm and soothe your baby. This swing easily folds for portability and storage. MODEL: 7030 Whisper Quiet(TM) operation Calming melodies with volume control and auto shutoff. Swing speeds and swing timer with 3 settings: 15, 30, and 45 minutes. Canopy toy bar pivots back for easy access to baby. Adjustable 5-point harness keeps baby secure Machine-washable seat pad.