Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
1998-01-27
2001-07-24
Lee, Cheukfan (Department: 2722)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S474000
Reexamination Certificate
active
06266164
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image scanning device, and more particularly, to an image scanning device having two parallel wheel sets for maintaining scanning direction.
2. Description of the Prior Art
Please refer to FIG.
1
and FIG.
2
.
FIG. 1
is a top sectional view of a prior art flatbed scanning device
10
.
FIG. 2
is a sectional view taken along line
2
—
2
of the scanning device
10
. The scanning device
10
comprises a housing
11
, a scanning module
20
, and a driving device which comprises steel strips
16
. The housing
11
comprises a transparent platform
12
on its top for placing a document to be scanned, and two parallel tracks
14
installed along left and right directions below the transparent platform
12
. The scanning module
20
is slidably mounted on the parallel tracks
14
. It comprises a plastic chassis
28
, an elongated image sensor
18
mounted inside the chassis
28
for scanning the document, and two wheel sets
21
installed under two ends of the chassis
28
for engaging the parallel tracks
14
and supporting the chassis
28
upward. Each wheel set
21
comprises a roller wheel
22
installed on its lower end for rotatably engaging one track
14
, and a spring (not shown) inside for elastically pushing the chassis
28
upward against the transparent platform
12
. The steel strips
16
of the driving device are mounted on two ends of the chassis
28
for pulling the scanning module
20
along the two parallel tracks
14
of the transparent platform
12
. The wiring structure of the steel strips
16
is quite complex and is only partially shown on FIG.
1
.
Since each wheel set
21
of the scanning module
20
has only one roller wheel
22
, it can neither properly maintain the sliding direction of the scanning module
20
nor can it keep the balance of the scanning module
20
on the tracks
14
when scanning a document. The sliding direction and balance of the scanning module
20
are completely maintained by the wiring structure of the steel strips
16
. However, the wiring structure of the steel strips
16
is very complex and it is very time consuming to install or adjust the wiring structure of the steel strips
16
.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide a scanning device which comprises two parallel wheel sets for maintaining scanning direction and balance of its scanning module so that its driving device can be simplified.
In a preferred embodiment, the present invention provides a scanning device comprising:
a housing having a transparent platform set in its top for placing a document , and two parallel tracks installed along left and right directions inside the housing under the transparent platform;
a scanning module slidably mounted on the two parallel tracks for scanning the document, the scanning module comprising:
an elongated image sensor having two ends, and
two wheel sets installed under the two ends of the image sensor separately for engaging the two parallel tracks wherein each wheel set comprises two roller wheels for supporting the image sensor upward and maintaining scanning direction and balance of the image sensor to prevent it from wobbling when sliding along the two parallel tracks; and
a driving device installed inside the housing for driving the scanning module along the two parallel tracks to scan the document.
It is an advantage of the present invention that each of the two wheel sets comprises two roller wheels for maintaining the scanning direction and balance of the image sensor so that the driving device can be greatly simplified.
This and other objectives and the advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment which is illustrated in the various figures and drawings.
REFERENCES:
patent: 4870502 (1989-09-01), Dreinhoff et al.
patent: 5113268 (1992-05-01), Yoshida et al.
patent: 5239392 (1993-08-01), Suzuki et al.
patent: 5299033 (1994-03-01), Watanabe et al.
patent: 5734483 (1998-03-01), Itoh
patent: 5857133 (1999-01-01), Sun
Hsu Winston
Lee Cheukfan
Primax Electronics Ltd.
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