What is claimed is:
1. A belt adjusting device of the belt sander, comprising:
a seat provided respectively at two ends with a driving roller pivoted thereto, and a driven roller pivoted thereto, said driving roller pivoted at one end with a motor spindle and provided at other end with a free end, said driven roller being mounted at one end on said seat and provided at other end with a free end;
a sanding belt movably fitted with outer peripheries of said two rollers;
a deceleration gear set mounted on said free end of said driving roller and formed of a plurality of deceleration gears and a shaft rod, said deceleration gears being driven by said motor to actuate said shaft rod to rotate;
a swiveling member provided at one end with a long slot, and at other end with a push portion, said long slot intended for use in putting pivotally therethrough said shaft rod capable of sliding in said long slot to enable said push portion to swivel a predetermined angle; and
an action rod disposed in one side of said seat such that said action rod is slidably disposed between said driving roller and said driven roller, and that said action rod is pivotally fastened at one end with said free end of said driven roller, and further that other end of said action rod is constantly in contact with said push portion of said swiveling member, thereby enabling said action rod to be pushed by said push portion to slide so as to push said free end of said driven roller to engage in an up-and-down displacement perpendicular to said motor spindle.
2. The belt adjusting device as defined in claim 1, wherein said shaft rod of said deceleration gear set is set up in such a manner that said shaft rod extends in a direction perpendicular to said motor spindle; wherein said swiveling member is of a Z-shaped construction, said action portion and said long slot being disposed in a horizontal portion of two ends thereof.
3. The belt adjusting device as defined in claim 2, wherein said push portion of said swiveling member is of a triangular construction; wherein said action rod is provided with a slanted insertion slot corresponding to and engageable with said push portion.
4. The belt adjusting device as defined in claim 2, wherein said push portion of said swiveling member is provided with a through hole and a bolt which is put through said through hole to mount said push portion on a lug of one side of said seat.
5. The belt adjusting device as defined in claim 1, wherein said end of said action rod in contact with said driven roller is provided with an inner threaded hole; wherein said driven roller is fastened with one end of a pivoting member, with other end of said pivoting member being provided with an outer threaded section which is engaged with two nuts and said inner threaded hole, thereby enabling the distance of the up-and-down displacement of said driven roller to be changed by adjusting a connection length of said pivoting member and said action rod.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for delivering compressed multimedia information to one or more users, each having one or more resource constraints, comprising the steps of:
(a) receiving at least a segment of said compressed multimedia information and a corresponding utility based descriptor;
(b) parsing said utility based descriptor into two or more portions of descriptor information, each portion corresponding to a different one or more resource constraints;
(c) for each of said one or more users, selecting one of said two or more utility based descriptor information portions, if any, which corresponds to said resource constraints for said user;
(d) for each of said one or more users, adapting said received compressed multimedia segment by said selected utility based descriptor information portion; and
(e) interpolating, for each of said one or more users for which one of said two or more utility based descriptor information portions were not selected in step (c), between two consecutive utility based descriptor information portions from said two or more utility based descriptor information portions to generate an interpolated utility based descriptor which approximately corresponds to said resource constraints for said user.
2. The method of claim 1, wherein said compressed multimedia information comprises MPEG-4 data.
3. The method of claim 1, wherein said compressed multimedia information comprises MPEG-2 data.
4. The method of claim 1, wherein said compressed multimedia information comprises MPEG-1 data.
5. The method of claim 1, wherein said resource constraints comprise target rate information.
6. The method of claim 1, wherein said parsing step comprises parsing said received utility based descriptor into five to one hundred portions, each portion corresponding to a unique set of one or more resource constraints.
7. The method of claim 1, wherein said portions of utility based descriptor information are uniformly sampled.
8. The method of claim 1, wherein said portions of utility based descriptor information are non-uniformly sampled.
9. The method of claim 1, wherein said adaptation step includes dropping frames.
10. The method of claim 9, wherein said frames comprise first B frames in each sub group of pictures of said received segment.
11. The method of claim 9, wherein said frames comprise all B frames in each group of pictures of said received segment.
12. The method of claim 9, wherein said frames include a P frame at an end of each group of pictures of said received segment.
13. The method of claim 1, wherein said adaptation step further includes DCT coefficient dropping.
14. The method of claim 1, wherein said adaptation step further includes truncation of an MPEG-4 Fine Granularity Scalability stream.
15. The method of claim 1, wherein said resource constraints comprise target rate information, and further comprising the step of receiving user preference information from at least one of said one or more users, and wherein said adaptation step further includes using said user preference information for said corresponding user.
16. The method of claim 1, wherein said resource constraints comprise target rate information, and further comprising the step of receiving target bit rate feedback from a network corresponding to at least one of said one or more users, and wherein said adaptation step further includes using said feedback for said corresponding user.
17. The method of claim 1, and wherein said adaptation step further includes using a predetermined network bandwidth parameter for adapting said received compressed multimedia segment.
18. The method of claim 1, wherein said compressed multimedia information comprises stored video information.
19. The method of claim 1, wherein said compressed multimedia information comprises live video information.