Mustek Systems Inc.

Emmet Chen

Jenn-Tsair Tsai

Te-Chih Chang

Bill Chen

Albert Lu

The present invention provides a scanning device. The scanning device comprises a document plate for placing a document, at least a sliding guide placed at one side of the document plate, a scanning module which is in front of the document plate for scanning the document along the direction of the sliding guide, a first light source assembled in the scanning module for providing light to scan documents, and a driving module electrically connected to the scanning module for driving the scanning module to perform scanning procedure to the document.

Apparatus for scanning documents in front of a document plate

A method and structure for coupling to a step motor shaft is characterized by providing a predetermined back-lash distance defined between the step motor shaft and a key, thereby to instantly reach the desired speed for driving a load. Accordingly, a shaft coupling device is provided to connect to a rotatable load. The shaft coupling device has a key which maintains a back-lash distance defined between a step motor shaft and the key. Eventually, when the step motor shaft is not driving the load, they are separated. When the step motor shaft is driven by the step motor, it self-spins in a first direction and travels through a distance so as to form a predetermined back-lash distance between the key. As soon as the back-lash distance is formed, the step motor shaft reverses its rotation direction and then starts to travel through the predetermined back-lash distance to drive the load. The speed of the step motor shaft soon increases as it rotates in a second direction and approaches the load. At that moment, the speed of the step motor has already been accelerated. Consequently, the desired speed of the step motor for driving the load will be instantly reached.

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Ta-Tou, Taiwan

Emmet Chen