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A grinder includes a grinder housing having a grinder actuator, a first grinding plate, a second grinding plate and a detachable coupling arrangement. The first grinding plate is detachably coupling with the grinder actuator, wherein the first grinding plate has a plurality of first grinding knifes

A grinder includes a grinder housing having a grinder actuator, a first grinding plate, a second grinding plate and a detachable coupling arrangement. The first grinding plate is detachably coupling with the grinder actuator, wherein the first grinding plate has a plurality of first grinding knifes downwardly and spacedly extended from a bottom side of the first grinding plate. The second grinding plate has a plurality of second grinding knifes upwardly and spacedly extended from the top side of the second grinding plate at a position that the first and second grinding knifes are spacedly disposed within a grinding compartment, such that when the grinder actuator is turned with respect to the grinder base to drive the first grinding plate to rotate, the first and second grinding knifes are correspondingly moved within the grinding compartment to provide a grinding action.

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What is claimed is: 1. A grinder, comprising: a grinder housing comprising a grinder base and a grinder actuator detachably coupling with said grinder base, and forming a grinding compartment therebetween; a first grinding unit detachably coupling with said grinder actuator, wherein said first grin

What is claimed is: 1. A grinder, comprising: a grinder housing comprising a grinder base and a grinder actuator detachably coupling with said grinder base, and forming a grinding compartment therebetween; a first grinding unit detachably coupling with said grinder actuator, wherein said first grinding unit comprises a first grinding plate and a plurality of first grinding knifes downwardly and spacedly extended from a bottom side of said first grinding plate; a second grinding unit detachably coupling with said grinder base, wherein said second grinding unit comprises a second grinding plate and a plurality of second grinding knifes upwardly and spacedly extended from said top side of said second grinding plate, wherein said grinding compartment is formed between said first and second grinding plates that said first and second grinding knifes are spacedly disposed within said grinding compartment, such that when said grinder actuator is turned with respect to said grinder base to drive said first grinding plate to rotate, said first and second grinding knifes are correspondingly moved within said grinding compartment to provide a grinding action; and a detachable coupling arrangement comprising a first magnetic element affixing to said first grinding plate, and a second magnetic element which is affixed to said second grinding plate to align with said first magnetic element, wherein said first magnetic element is magnetically attached to said second magnetic element to detachably couple said first grinding plate with said second grinding plate so as to allow said first and second grinding plates detaching with each other and rotating with each other to correspondingly move said first and second grinding knifes within said grinding compartment. 2. The grinder, as recited in claim 1, wherein said grinder actuator comprises a ring shaped transmission member rotatably disposed in said grinding compartment at a position that an upper circumferential edge of said transmission member is engaged with a peripheral edge of said first grinding plate and a lower circumferential edge of said transmission member is biased against a peripheral edge of said second grinding plate, and a top actuation cap, which is detachably engaged with said grinder base in a rotatably movable manner having a peripheral rim coupled with said upper circumferential edge of said transmission member such that when said top actuation cap is rotated, said first grinding plate is driven to rotate through said transmission member so as to correspondingly move said first and second grinding knifes within said grinding compartment. 3. The grinder, as recited in claim 2, wherein said upper circumferential edge of said transmission member, having a L-shaped cross section, has an inner engaging groove engaging with said peripheral edge of said first grinding plate so as to embed said first grinding plate at said upper circumferential edge of said transmission member, such that said transmission member not only transmits a rotational force from said top actuation cap to said first grinding plate but also retains said first and second grinding plates at an uniform distance. 4. The grinder, as recited in claim 3, wherein said peripheral rim of said top actuation cap having a L-shaped cross section and forming an inner holding groove to engage with said upper circumferential edge of said transmission member and said peripheral edge of said first grinding plate. 5. The grinder, as recited in claim 2, wherein said grinder base comprises a tubular shelter, which is detachably engaged with said top actuation cap, having an engaging rib protruding from an inner wall of said tubular shelter to engage with said peripheral edge of said second grinding plate so as to retain said second grinding plate in position. 6. The grinder, as recited in claim 4, wherein said grinder base comprises a tubular shelter, which is detachably engaged with said top actuation cap, having an engaging rib protruding from an inner wall of said tubular shelter to engage with said peripheral edge of said second grinding plate so as to retain said second grinding plate in position. 7. The grinder, as recited in claim 5, wherein said grinder base further comprises a bottom actuation cap detachably engaging with said tubular shelter and arranged in such a manner that when said top and bottom actuation caps are rotated back and forth correspondingly, said first and second grinding knifes are moved rotated back and forth correspondingly in a grinding manner. 8. The grinder, as recited in claim 6, wherein said grinder base further comprises a bottom actuation cap detachably engaging with said tubular shelter and arranged in such a manner that when said top and bottom actuation caps are rotated back and forth correspondingly, said first and second grinding knifes are moved rotated back and forth correspondingly in a grinding manner. 9. The grinder, as recited in claim 7, wherein said second grinding plate has a plurality of collecting holes spacedly formed thereon to communicate said grinding compartment with an interior of said bottom actuation cap such that when said first and second grinding units are driven for grinding objects within said grinding compartment, said grinded objects are dropped and collected at said bottom actuation cap through said collecting holes. 10. The grinder, as recited in claim 8, wherein said second grinding plate has a plurality of collecting holes spacedly formed thereon to communicate said grinding compartment with an interior of said bottom actuation cap such that when said first and second grinding units are driven for grinding objects within said grinding compartment, said grinded objects are dropped and collected at said bottom actuation cap through said collecting holes. 11. The grinder, as recited in claim 9, wherein said aid grinder base further comprises a filtering holder detachably mounting between said bottom actuation cap and said tubular shelter and a filtering layer mounted within said filtering holder for filtering said grinded objects being dropped from said collecting holes and collected at said bottom actuation cap. 12. The grinder, as recited in claim 10, wherein said aid grinder base further comprises a filtering holder detachably mounting between said bottom actuation cap and said tubular shelter and a filtering layer mounted within said filtering holder for filtering said grinded objects being dropped from said collecting holes and collected at said bottom actuation cap. 13. The grinder, as recited in claim 1, wherein detachable coupling arrangement further comprises a first magnetic housing provided at a center of said first grinding plate to retain said first magnetic element in position, and a second magnetic housing protruded from a center of said second grinding plate to retain said second magnetic element in position so as to alignedly guide said second magnetic element to magnetically attach to said first magnetic element. 14. The grinder, as recited in claim 6, wherein detachable coupling arrangement further comprises a first magnetic housing provided at a center of said first grinding plate to retain said first magnetic element in position, and a second magnetic housing protruded from a center of said second grinding plate to retain said second magnetic element in position so as to alignedly guide said second magnetic element to magnetically attach to said first magnetic element. 15. The grinder, as recited in claim 12, wherein detachable coupling arrangement further comprises a first magnetic housing provided at a center of said first grinding plate to retain said first magnetic element in position, and a second magnetic housing protruded from a center of said second grinding plate to retain said second magnetic element in position so as to alignedly guide said second magnetic element to magnetically attach to said first magnetic element. 16. The grinder, as recited in claim 1, wherein said first and second grinding knifes are perpendicularly extended from said first and second grinding plates respectively. 17. The grinder, as recited in claim 15, wherein said first and second grinding knifes are perpendicularly extended from said first and second grinding plates respectively. 18. The grinder, as recited in claim 1, wherein said first and second grinding plates are supported in a parallel manner that said first grinding knifes are offset from said second grinding knifes within said grinding compartment such that a circular moving path of each of said first grinding knifes is different from that of each of said second grinding knifes. 19. The grinder, as recited in claim 6, wherein said first and second grinding plates are supported in a parallel manner that said first grinding knifes are offset from said second grinding knifes within said grinding compartment such that a circular moving path of each of said first grinding knifes is different from that of each of said second grinding knifes. 20. The grinder, as recited in claim 17, wherein said first and second grinding plates are supported in a parallel manner that said first grinding knifes are offset from said second grinding knifes within said grinding compartment such that a circular moving path of each of said first grinding knifes is different from that of each of said second grinding knifes.