Reading apparatus

Abstract

A reading apparatus includes an auto document feeder configured to be openable and closable around a hinge with respect to a unit including an image sensor. The auto document feeder includes a roller configured to move a document relative to the image sensor, a motor, a gear train configured to transmit a rotation of a rotational shaft of the motor to the roller, and an encoder unit configured to detect rotation information of the motor, and including a sensor and a code wheel. An orientation of the rotational shaft is substantially parallel to a rotational axis of the hinge, and the gear train is arrayed in a direction of an extension of the rotational shaft. A gear that is a part of the gear train is attached to one end of the rotational shaft, and the code wheel is attached to the other end thereof.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present disclosure relates to a reading apparatus capable of reading an image of a document.[0003]2. Description of the Related Art[0004]A reading apparatus that reads an image of a document while allowing the document and an image sensor to make a relative movement is known. One type is a flatbed type scanner (abbreviated as an FBS in the specification) that performs scanning and reading while moving an image sensor (a line sensor) relative to the document fixed on a document positioning plate. Another type is a sheet-through type scanner that performs scanning and reading while moving a document relative to a fixed image sensor (a line sensor). A unit that separates and moves documents one by one is referred to as an auto document feeder (abbreviated as an ADF in the specification).[0005]Japanese Patent No. 2627044 discusses a reading apparatus having a combination of these types. The apparatus discussed in Japane...

AI Technical Summary

Benefits of technology

[0008]The present disclosure is directed to a reading apparatus capable of realizing compatibility between reduction in size of a reading apparatus and document reading with a high accuracy.

[0010]According to an exemplary embodiment of the present invention, an orientation of a rotational shaft of a motor is substantially parallel with a rotational axis of a hinge of an auto document feeder, and a gear train is arrayed in a direction of an extension of the rotational shaft, and, as a result, reduction in size of the apparatus is realized. In addition, a gear and a code wheel are attached separately at respective end portions of the rotational shaft of the motor, and, as a result, high detection accuracy of an encoder can be maintained for a long period of time. In this way, according to the exemplary embodiment of the present invention, compatibility between reduction in size of the reading apparatus and document reading with a high accuracy can be realized.

Problems solved by technology

Consequently, both sides of the DC motor form a large dead space, and the area of the apparatus in a depth direction is uselessly large

Thus, the positional deviation leads to deterioration of detection accuracy of the encoder.

In addition, grease used for lubrication of the worm gear is likely to adhere to the adjacent code wheel or an encoder sensor, so that the soiling leads to deterioration of detection accuracy of the encoder.