Plastic Coated Type
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Metal type elements or metal type belts 10 with engraved type 11 have the tendency to abrade ink ribbons especially during early life. Polishing and plating methods are being used to minimize this problem, but these processes are difficult to control and to inspect. Providing a thin layer 12 of plastic at and around the type 11 will reduce the early life problem. A TEFLON* film, for example, will provide such protection and will wear off gradually, adapting the type surface 13 to the ribbon and generating rounded type corners. This reduces the ribbon failures, and can extend the type life. Fig. 1 shows the belt 10 when layer 12 is first applied. Fig. 2 shows the belt 10 after the layer 12 has been worn from the type surfaces 13 leaving a layer 12 with rounded type corners. * Trademark of E. I. du Pont de Nemours & Co.