Electrophotography – Image formation – Exposure
Reexamination Certificate
1997-12-26
2001-04-17
Braun, Fred L. (Department: 2852)
Electrophotography
Image formation
Exposure
C358S496000, C399S215000
Reexamination Certificate
active
06219511
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image reading apparatus to read document images and used in copy machine and the like.
2. Description of the Related Art
Conventional image reading apparatuses (hereinafter referred to as “stationary platen panning devices”) are known which read the image of an entire document by placing a document on a glass platen at the image reading position of a static reader, and transporting said document over said glass platen at a constant speed. In stationary platen panning devices, a document must be transported onto the glass platen with precision in order to accurately read the document image. To this end, stationary platen panning devices are known to provide a transport roller to transport a document between said transport roller and the glass platen.
In such stationary platen panning devices, although a document can be transported with precision in the range of the nip formed between the glass platen and the transport roller when said document is gripped between the transport roller and the glass platen, a disadvantage arises insofar as the document curls along the transport roller on the upstream side and downstream side of said nip.
On the other hand, stationary platen panning devices typically have a reader with a reading range capable of reading the width of the document in the document transport direction in a single pass. When the stationary platen panning device is an analog copy machine, the single pass reading range of the reader is particularly broad. Accordingly, the nip width between the transport roller and glass platen must be broader than the single pass reading range of the reader. Since the diameter of the transport roller in contact with the glass platen must be increased, therefore, the size of the image reading apparatus is increased.
OBJECTS AND SUMMARY
An object of the present invention is to provide an image reading apparatus capable of accurately transporting documents without increasing the overall size of the apparatus.
Objects of the present invention are attained by providing an image reading apparatus comprising: a
a reader to read document images, said reader having a stationary image reading position; and
a transporter to transport a document at constant speed onto the image reading position, said transporter including guide members and a transport member,
said guide members to guide document transport and which are provided adjacent to the upstream side of a document reading position in the direction of document transport by said transporter, and
said transport member to transport a document without gripping between said guide members and itself and provided above said guide members.
These and other objects, advantages and features of the present invention will become apparent from the following description thereof taken in conjunction with the accompanying drawings which illustrate specific embodiments of the invention.
REFERENCES:
patent: 4429866 (1984-02-01), Castro-Hahn
patent: 4474457 (1984-10-01), Phelps
patent: 4970606 (1990-11-01), Shima
patent: 5168310 (1992-12-01), Hayashi et al.
patent: 5206735 (1993-04-01), Gauronski et al.
patent: 5339139 (1994-08-01), Fullerton et al.
Braun Fred L.
Minolta Co. , Ltd.
Sidley & Austin
LandOfFree
Image reading apparatus having a guide member and transport... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image reading apparatus having a guide member and transport..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image reading apparatus having a guide member and transport... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2498903