| 摘要 |
PURPOSE:To reduce the weight and size of a platen, by a method wherein a main body formed of a stiff material is provided with impacted members formed of an elastic material. CONSTITUTION:Four impacted members 9a-9d formed of a rubber, a plastic or the like are fitted respectively to four faces of a main body 8 of the platen formed of a stiff material and being a quadrilateral prism in shape to constitute the platen. When the impacted member 9a is damaged, another impacted member 9b, 9c or 9d can be immediately set by rotating the platen with a point P as a center, so that printing can be continued without wasting time. A main body 10 of a platen being a quadrilateral prism in shape is obtained by detachably fitting impacted members 11a-11d into grooves 12a-12d. In general, a type face 14 of a type 13 is provided with a radius of concave curvature of about R60. Since an impacted surface of the impacted member 15 of the platen 17 is provided with a radius of convex curvature conforming substantially to that of the type face 14, the same print quality as that of a large-type cylindrical platen can be obtained although the platen 17 is small in size. |
