Method for Identifying Defects in Print Wheels
Original Publication Date: 1985-Apr-01
Included in the Prior Art Database: 2005-Feb-18
A print wheel, which is formed with each of its print petals being the same character, is mounted in a horizontal position on a shake table for vertical vibration at the resonant frequency of the print petal. Increased moisture, variations in the petal dimensions, or defects in the mold for forming the plastic print wheel are identified through the print petals vibrating at a different resonant frequency. A print wheel 1 is formed with each of its print petals 2 being the same character so as to have the same mass and dimensions. When the print wheel 1 is mounted in a horizontal plane on a shake table and vibrated vertically, each of the petals 2 vibrates similarly to a cantilever beam when subjected to its resonant frequency. By forming each of the petals 2 of the same character, each has the same natural frequency.