| 摘要 |
There is disclosed in this application a printing apparatus including small balls of magnetic material prepared in large numbers as printing elements for forming characters or symbols. a wheel having a surface made of ferromagnetic material, a magnetizing head for magnetizing the surface of the wheel to cause the small balls to be magnetically attracted thereto, and an erasing head for demagnetizing the surface of the wheel to remove the magnetically attracted small balls therefrom. As the wheel is brought into pressing engagement with sheets while rotating, images of characters or symbols are formed on the sheets in the form of a pattern formed from a combination of the small balls. The trouble of noise production when printing is carried out can be eliminated because the sheets are brought into pressing engagement with the surface of the wheel while the wheel is rotating.
|
