Abstract: A Synthetic resin lens having a surface hard coating comprises a synthetic resin lens body and a surface hard coat deposited on the lens body. The synthetic resin lens body is made of a resin obtained by copolymerizing monomers consisting essentially as synthetic resinous components of 10 to 80 percent by weight of at least one diester of itaconic acid and mesaconic acid, 10 to 80 percent by weight of at least one allyl compound and 5 to 50 percent by weight of diethyleneglycol bis(allylcarbonate). The surface hard coat is formed by curing a coating composition comprising 50 to 800 parts by weight of at least one organic silicon compound, 100 parts by weight of colloidal silica, 50 to 600 parts by weight of a polyfunctional compound such as a polyfunctional epoxy compound, a polyalcohol, a polycarboxylic acid, or a polycarboxylic anhydride and 0.01 to 5.0 percent by weight of a curing catalyst based on the residual solids in the composition after curing.

Abstract: A compact printer has a type drum having at least one row of types, the types, including at least one space, being arranged on the periphery of the drum at regular intervals. The type drum is rotated by a stepper motor and a hammer member is provided for moving a selected type towards the paper for printing. The stepper motor is turned by signals which correspond to each step necessary to move the type drum through at least one pitch distance between types. Ratchet teeth, moving with the type drum, can be engaged by a blocking lever when rotation of the type drum is reversed, so as to stop vibration of the type drum at the time of printing.