Scanner gear assembly with variable speed ratio

Details Scanner gear assembly with variable speed ratio Scanner gear assembly with variable speed ratio

1999-09-08

2001-06-12

Herrmann, Allan D. (Department: 3682)

Machine element or mechanism

Gearing

Interchangeably locked

C074S089220, C358S412000, C358S497000

Reexamination Certificate

active

06244124

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a gear assembly for a scanner, particularly to a gear assembly for a scanner which can select different speed ratios such that the scanner is able to perform the scanning task at different resolutions.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, the conventional scanner
1
a
generally uses a motor (not shown) as a power source, and a change gear set
10
a
and a flexible member
11
a
, such as a belt or a steel rope, to displace a charge coupled device (CCD)
12
a
such that the CCD
12
a
is moved along the scanning direction.
However, the change gear of the conventional scanner can only provide a constant speed ratio to the scanner when being driven by the motor. Therefore, the resolution of the scanner cannot be adjusted.
It is the object of the invention provide a gear assembly with variable speed ratios for a scanner wherein two gear sets with different speed ratios are arranged on a rotary disk and the rotary disk is driven to select the desired speed ratio, such that the scanner is able to perform the scanning task at different resolutions.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which:


REFERENCES:
patent: 138456 (1873-04-01), Walty
patent: 1481706 (1924-01-01), Goodwin
patent: 3938437 (1976-02-01), Punater
patent: 5373372 (1994-12-01), Loewen

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