Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-10-06
2001-11-20
Thompson, Gregory (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C415S122100, C415S176000
Reexamination Certificate
active
06320745
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an automatic cooling mechanism, and more particularly to an automatic cooling mechanism for an electrical device having a rolling shaft.
BACKGROUND OF THE INVENTION
Today's electrical devices are required to have high integration and high performance. Accordingly, some of the electrical elements are often have high temperatures. For example, an automatic document feeder (ADF) is developed to be used with a flatbed scanner. The ADF can automatically feed document sheets one by one to the flatbed scanner to be scanned. However, most of the ADFs are asked to have reduced volumes and increased document-feeding speeds. As a result, a lot of heat is generated by the elements such as the print circuit board of the ADF. Cooling elements made of aluminum or copper, etc . . . are often used to reduce the temperature. However, the cooling effects are limited. The effect of a cooling cream is also limited. Furthermore, the cooling cream must be coated on the surface of the high-temperature uniformly, otherwise many problems may happen.
A more efficient method is to use a fan to cool the high-temperature element. However, conventional fan is equipped with a motor. The additional motor will also generate heat to increase the temperature within the electrical device. Furthermore, the additional motor will increase the cost.
It is then attempted by the applicant to deal with the above-mentioned problems.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an efficient cooling mechanism for an electrical device.
Another object of the present invention is to provide a cooling mechanism for an electrical device without additional motor.
According to the present invention, an automatic cooling mechanism for an electrical device having a high-temperature element and a rolling shaft is provided.
According to the present invention, an automatic cooling mechanism for an electrical device having a high-temperature element and a rolling shaft is provided. The mechanism includes a fan mounted within the electrical device; and a rotation transmission and variation mechanism connected between the fan and the rolling shaft for variationally transmitting rotational kinetic energy from the rolling shaft to the fan.
According to one aspect of the present invention, the rotation transmission and variation mechanism is preferably a gear set having a first gear mounted on the rolling shaft and a second gear mounted on the fan and engaged with the first gear.
The second gear preferably has a radius larger than that of the first gear.
The second gear preferably further includes a plurality of holes for allowing air to pass therethrough.
According to another aspect of the present invention, the rotation transmission and variation mechanism preferably includes a rotary disk mounted on the fan and an elastic element connected between the rolling shaft and the rotary disk for transmitting rotational kinetic energy from the rolling shaft to the fan.
The rotary disk preferably includes a plurality of holes for allowing air to pass therethrough. The elastic element is preferably a belt or a rope.
According to the present invention, the electrical device preferably further includes a shell structure for receiving therein the high-temperature element. The fan can preferably introduce air into the shell structure. In another situation, the air filled within the shell structure may be exhausted by the fan.
The electrical device preferably further includes an air entrance/exist. The air entrance/exist preferably includes a plurality of holes formed on the shell structure.
Preferably, the electrical device is an automatic document feeder (ADF). The ADF preferably includes a plurality of rollers mounted on the rolling shaft for feeding thereby a document.
The present invention may best be understood through the following description with reference to the accompanying drawings, in which:
REFERENCES:
patent: 6031721 (2000-02-01), Bhatia
patent: 4052166 (1992-02-01), None
McGuireWoods LLP
Mustek Systems Inc.
Thompson Gregory
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