Automatic document conveyance device and image reading apparatus using the same

Abstract

An automatic document conveyance device, include a paper guide which has a slot formed by cutting off a part of a conveyance surface for guiding a document; a conveyance unit which inserts in and detach from the slot; wherein the conveyance unit further comprising: a motor which generates driving force; a motor holding part which holds the motor; a driving roller which conveys a document; a drive transmission mechanism which transmits the driving force generated by the motor to the driving roller via a driving roller shaft; and a fitting part which fits the conveyance unit into the slot so that one surface of the conveyance unit forms the conveyance face.

1 . An automatic document conveyance device, comprising:
 a paper guide which has a slot formed by cutting off a part of a conveyance surface for guiding a document;   a conveyance unit which inserts in and detach from the slot; wherein the conveyance unit further comprising:   a motor which generates driving force;   a motor holding part which holds the motor;   a driving roller which conveys a document;   a drive transmission mechanism which transmits the driving force generated by the motor to the driving roller via a driving roller shaft; and   a fitting part which fit into the slot of the conveyance unit so that one surface of the conveyance unit forms the conveyance face.   
     
     
         2 . The automatic document conveyance device according to  claim 1 , further comprising:
 electric contact parts which are provided in the conveyance unit and the slot, respectively and brought into contact with each other when the conveyance unit is installed in the paper guide.   
     
     
         3 . The automatic document conveyance device according to  claim 1 , further comprising:
 a driving roller shaft holding part which holds the driving roller that is included in the conveyance unit; wherein   the driving roller shaft holding part is fixed to the conveyance unit by a screw.   
     
     
         4 . The automatic document conveyance device according to  claim 1 , wherein
 one the driving roller shaft holds a plurality of the drive rollers and the drive transmission mechanism is disposed between one driving roller and the other drive roller.   
     
     
         5 . The automatic document conveyance device according to  claim 1 , wherein
 a support member which is extending in a lateral direction perpendicular to a document conveying direction is disposed in a vicinity of the slot.   
     
     
         6 . An image reading apparatus, comprising:
 an image scanner which reads a image of a document; and   an automatic document conveyance device which has a paper guide and a conveyance unit; wherein   the paper guide has a slot formed by cutting off a conveyance surface for guiding a document; and   a conveyance unit cab be inserts in and detach from the slot and has a motor which generates driving force, a motor holding part which holds the motor, a driving roller which conveys a document, a drive transmission mechanism which transmits the driving force generated by the motor to the driving roller via a driving roller shaft, and a fitting part which fits the conveyance unit into the slot so that one surface of the conveyance unit form a conveyance face.   
     
     
         7 . The image reading apparatus according to  claim 6 , the automatic document conveyance device further comprising:
 electric contact parts which are provided in the conveyance unit and the slot, respectively and brought into contact with each other when the conveyance unit is installed in the paper guide.   
     
     
         8 . The image reading apparatus according to  claim 6 , the automatic document conveyance device further comprising:
 a driving roller shaft holding part which holds the driving roller that is included in the conveyance unit; wherein   the driving roller shaft holding part is fixed to the conveyance unit by a screw.   
     
     
         9 . The image reading apparatus according to  claim 6 , wherein
 one the driving roller shaft holds a plurality of the drive rollers and the drive transmission mechanism is disposed between one driving roller and the other drive roller.   
     
     
         10 . The image reading apparatus according to  claim 6 , wherein
 a support member which is extending in a lateral direction perpendicular to a document conveying direction is disposed in a vicinity of the slot.