Printer capable of printing two surfaces of a web

摘要

A printer capable of printing two surfaces of a medium is disclosed in the present invention. The printer includes a base, a holder rotatably disposed on the base for holding webs, and a rotary mechanism for rotating the holder relative to the base. The rotary mechanism includes a wheel disposed on the holder, and a gear crank disposed on the base. A plurality of slots is formed on the wheel, and the gear crank includes an actuating pin. The actuating pin can slide into one of the slots when the gear crank rotates, so as to rotate the wheel, and the holder can rotate relative to the base.

主权项

1. A printer comprising:
a base; a holder rotatably disposed on the base for holding a web; and a rotary mechanism for rotating the holder relative to the base, so as to print two surfaces of the web, the rotary mechanism comprising:
a wheel disposed on the holder, a plurality of slots being formed on the wheel;a gear crank disposed on the base, the gear crank comprising an actuating pin, the actuating pin sliding into one of the slots when the gear crank rotates, so as to rotate the wheel;a first sensor;an auxiliary gear disposed on the base and engaged with the gear crank; anda first trigger pin disposed on the auxiliary gear, the first sensor being triggered to generate a controlling signal for stopping the gear crank by the first trigger pin when the auxiliary gear rotates by a predetermined angle.