Paper conveying apparatus
There are provided a paper conveying apparatus that can prevent a drop in quality of the image data while enabling stable conveyance of paper. The paper conveying apparatus includes a first image capture unit, a second image capture unit, a pair of conveyor rollers including a first roller and a second roller, a first conveyor guide, and a second conveyor guide, wherein a nip position of the pair of conveyor rollers is arranged above an extended plane of a top surface of the first image capture unit extended to the pair of conveyor rollers side, an axis of rotation of the second roller is arranged offset to the first image capture unit side compared with an axis of rotation of the first roller at projections on the extended plane, and the first conveyor guide guides the medium conveyed to above from the extended plane, to make the medium turn downward.
1. A paper conveying apparatus comprising:
a first image capture unit for capturing an image of a sheet shaped medium;
a second image capture unit, arranged facing the first image capture unit above the first image capture unit, for capturing an image of a surface at an opposite side from the surface of the medium which the first image capture unit captures;
a pair of conveyor rollers having a first roller which conveys the medium to the first image capture unit and the second image capture unit, and a second roller arranged facing the first roller above the first roller;
a first conveyor guide arranged at the second image capture unit; and
a second conveyor guide for guiding the medium to the pair of conveyor rollers, wherein
a nip position of the pair of conveyor rollers is arranged above an extended plane of a top surface of the first image capture unit extended to the pair of conveyor rollers side,
an axis of rotation of the second roller is arranged offset to the first image capture unit side compared with an axis of rotation of the first roller at projections on the extended plane, and
the first conveyor guide guides the medium, which is guided from the second conveyor guide and is conveyed by the first roller to above the extended plane, to make the medium turn downward.
2. The paper conveying apparatus according to claim 1 , wherein a front end of the first conveyor guide is arranged to be positioned at the second conveyor guide side compared with the position where a tangent plane and the second roller contact, wherein the tangent plane contacts the first roller at the position where an extended plane of a conveyor surface of the second conveyor guide extended to the pair of conveyor rollers side and the first roller contact.
3. The paper conveying apparatus according to claim 1 , wherein the first conveyor guide is arranged so that an angle with respect to an extended plane of a conveyor surface of the second conveyor guide extended to the pair of conveyor rollers side becomes 30° or less.
4. The paper conveying apparatus according to claim 1 , wherein the pair of conveyor rollers are arranged so that the position, where a tangent plane which contacts the first roller at the nip position of the first roller and the second roller and the top surface of the first image capture unit contact, becomes the pair of conveyor rollers side compared with the image capture position of the second image capture unit.
5. The paper conveying apparatus according to claim 1 ,
wherein the second image capture unit moves in an upward direction away from the first image capture unit, due to pushing up movement of the first conveyor guide by the medium.
6. The paper conveying apparatus according to claim 5 , further comprising a guide member for enabling the second image capture unit to move in said upward direction while holding a bottom surface of the second image capture unit to be substantially parallel with a top surface of the first image capture unit.
7. The paper conveying apparatus according to claim 1 , wherein the distance between a nip position of the pair of conveyor rollers and the extended plane of the top surface of the first image capture unit extended to the pair of conveyor rollers side is set to be larger than a height of an embossing which can be formed on the medium.
8. The paper conveying apparatus according to claim 7 , further comprising a second pair of conveyor rollers which include a third roller which further conveys the medium from the first image capture unit and the second image capture unit, and a fourth roller arranged facing the third roller above the third roller, and wherein
a distance between a nip position of the second pair of conveyor rollers and the extended plane of the top surface of the first image capture unit extending to the second pair of conveyor rollers side is set to be larger than the height of the embossing which can be formed on the medium,
the first roller, the third roller, and the first image capture unit are fastened, and
the second roller, the fourth roller, and the second image capture unit are configured to be able to move in an upward direction away from the first image capture unit, by being pushed up by the medium.
9. The paper conveying apparatus according to claim 1 , wherein the first conveyor guide is arranged so as to overlap the first roller in a cross-section vertical to an axis of rotation of the first roller.