Patent Number: 7,103,289

Title: Printing paper loading device, printer having the same and method of setting IDs of plural paper loading devices

Abstract: A printing apparatus having plural printing paper loading devices and a main controller. Each of the printing paper loading devices has a sub-controller to generate a test signal, and an inverting circuit of an open collector type to generate an output signal by performing an inverting operation with respect to an input signal. The printing paper loading devices are consecutively connected so that the output signal of one of the printing paper loading devices becomes the input signal input into another of the printing paper loading devices. The inverting circuit outputs a low level signal regardless of the level of the test signal when the input signal is high level, and outputs a signal of a same level as the test signal when the input signal is of the low level. Each of the sub-controllers sets its own ID based on the level of the output signal of the printing paper loading device corresponding thereto. The main controller receives the IDs set by the sub-controllers through a common bus. As the IDs of the printing paper loading devices are automatically set, a user does not have to set the IDs. In addition, malfunction of the printing apparatus caused by mistakes in setting the IDs can be prevented.

Inventors: Hong; Choon-ho (Suwon, KR)

Assignee: Samsung Electronics Co., Ltd.

International Classification: G03G 15/00 (20060101)

Expiration Date: 9/05/02018