Photocopying – Contact printing – With scanning
Reexamination Certificate
2000-09-06
2002-04-02
Adams, Russell (Department: 2851)
Photocopying
Contact printing
With scanning
C355S072000, C358S498000
Reexamination Certificate
active
06366343
ABSTRACT:
BACKGROUND OF THE INVENTION
This application incorporates by reference Taiwanese application Ser. No. 89116814, Filed Aug. 18, 2000.
1. Field of the Invention
The invention relates in general to a scanning apparatus having two transmission systems, and more particularly to a scanning apparatus capable of shortening the time for the carriage to move back to the start.
2. Description of the Related Art
Along with the continuous advance and progress of technology, the integration and application of multi-media is now an overpowering trend. Multi-media generally mean data in various format such as word, image, and voice. Therefore, multi-media apparatus for capturing image or voice come with the tide of fashion. Among that, image-scanning apparatus is one of the common image capturing apparatuses.
Referring to
FIG. 1
, a conventional flatbed scanning apparatus is illustrated. The conventional flatbed scanning apparatus includes a scanning platform
102
and a cover
104
. Furthermore, as shown in
FIG.2
, there are an image capturing apparatus and a transmission system for transmitting the image capturing apparatus in the scanning platform
102
.
The transmission system
106
transmits the carriage
108
to move forward and backward along the transmission guide way
110
. The transmission system
106
includes a motor
112
. The motor
112
is in conjunction with a transmission gear-wheel
114
and the transmission gear-wheel
114
is in conjunction with a high gear-change rate transmission gear-wheel (or gear set)
116
. The motor
112
transmits the transmission gear wheel
114
, the high gear-change rate transmission gear wheel
116
and the carriage
108
so that the carriage
108
can move along the transmission guide way
110
back and forth to scan the document
103
on the scan platform
102
.
As high resolution of scanning apparatuses is required, gear sets with high gear-change rate are frequently used to meet the requirement. However, the applying of a high gear-change rate gear set lengthens the backward time of the carriage
108
. A conventional way to solve the problem is by using higher rotating speed motors. The problems followed are high cost, temperature rising and noise.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an improved and simplified scanning apparatus with high image quality, short carriage backward time and high scanning efficiency simply by using one-way clutches to control the carriage's motion.
According to the object of the invention, a scanning apparatus having two transmission systems is provided. The scanning apparatus includes a motor, the first transmission gear-wheel and the second gear-wheel, a relatively high gear-change rate transmission gear-wheel and a relative low gear-change rate transmission gear-wheel, the first one-way clutch, the second one-way clutch and a carriage. The first transmission gear-wheel and the second transmission gear-wheel are transmitted by the motor. The relatively high gear-change rate transmission gear-wheel is in conjunction with the first transmission gear-wheel. The relatively low gear-change rate transmission gear-wheel is in conjunction with the second transmission gear-wheel. The first one-way clutch disposed inside the relatively high gear-change rate transmission gear-wheel to control the relatively high gear-change rate transmission gear-wheel to rotate in a first direction. The second one-way clutch disposed inside the relatively low gear-change rate transmission gear-wheel to control the relatively low gear-change rate transmission gear-wheel to rotate in a second direction. The carriage is transmitted by the relatively high gear-change rate transmission gear-wheel through the first transmission belt to move forward and also the carriage is transmitted by the relatively low gear-change rate transmission gear-wheel through the second transmission belt to move backward.
REFERENCES:
patent: 4931834 (1990-06-01), Suga
patent: 5691826 (1997-11-01), Yeh et al.
patent: 5854696 (1998-12-01), Yun
patent: 6091516 (2000-07-01), Chang et al.
Adams Russell
Nguyen Hung Henry
Rabin & Berdo P.C.
Silitek Corporation
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