Sheet feeding or delivering – Feeding – Pack holders
Reexamination Certificate
1999-10-19
2001-07-03
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Feeding
Pack holders
Reexamination Certificate
active
06254085
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for feeding paper to a printing device, and more particularly, to the paper feeding apparatus of a printing device having an improved structure, which senses the page size of provided paper.
2. Description of the Related Art
An apparatus for feeding paper to the inside of the main body of a printing device is provided in a printing device such as a printer or a photocopier. The paper feeding apparatus shown in
FIG. 1
, includes a tray
20
releasably combined to one side of the main body
10
of the printing device, for receiving a stack of paper. A guide plate
21
for supporting the end portion of the received pieces of paper is movably installed in the tray
20
according to the paper size standard of the paper to be used. For example, in order to use A3 size paper instead of A4 size paper, the guide plate
21
is moved to a position suitable for the standard of the A3 size paper and then the paper is loaded.
In the conventional paper feeding apparatus having the above structure, since it is not possible to know the page size of paper received in the tray
20
unless the tray
20
is pulled out and checked, it is possible to have a printing error due to a difference in the size of an image to be printed and the page size of the paper. Namely, if the A4 size paper is loaded in the tray
20
when an image is intended for A3 size paper, the user only realizes the error after the printing is completed. Therefore, in this case, the paper is wasted and half of the image which was not printed is printed on a predetermined part in the printing device, thus contaminating the printing device, thus requiring cleaning of the printing device in order to print a clear image on the paper.
SUMMARY OF THE INVENTION
To solve the above problem, it is an object of the present invention to provide a paper feeding apparatus of a printing device having an improved structure so that a user can confirm the page size of the paper received in a tray without pulling out the tray from the main frame of the printing device.
Accordingly, to achieve the above object, there is provided a paper feeding apparatus of a printing device comprising a tray releasably combined to the main body of the printing device for receiving paper, a guide plate movably installed in the tray according to the page size of the paper, and a page size sensing means for sensing the movement position of the guide plate and determining the page size of the paper received in the tray, wherein the page size sensing means comprises a link which is pivotally installed centering around a hinge shaft provided in the tray, to one end of which the guide plate is connected, and which pivots around the hinge shaft according to the movement of the guide plate, a rack slidably installed in the tray, connected to the other end of the link, and sliding according to the pivot of the link, a driving plate which rotates, engaged with the rack and in which a plurality of marks corresponding to the page size of the paper are formed, and a sensor for sensing the marks and the page size of the paper.
REFERENCES:
patent: 5647585 (1997-07-01), Cheong
patent: 5655764 (1997-08-01), Ota et al.
patent: 6073925 (2000-06-01), Sato
patent: 4-16427 (1992-01-01), None
patent: 6-32489 (1994-02-01), None
patent: 6-32466 (1994-06-01), None
Bower Kenneth W
Ellis Christopher P.
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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