Shredder

1. A shredder comprising:

a driving motor;

a connection part transmitting a dynamic force of the driving motor;

a cutter shredding paper sheets inputted by a dynamic force transmitted from the connection part;

a manual paper feeding part manually supplying paper sheets to the cutter; and

an automatic paper feeding part automatically supplying paper sheets to the cutter by a dynamic force provided from the connection part;

wherein the automatic paper feeding part comprises a paper feeding tray, a roller, and a supply protrusion protruding from an outer circumference of the roller; and

wherein a receiving groove in which the supply protrusion is inserted is formed at the paper feeding tray.

2. The shredder according to claim 1 , wherein the cutter and the automatic paper feeding part are operated by a single driving motor.

3. The shredder according to claim 1 , wherein the cutter is a single cutter and shreds paper sheets provided from the automatic paper feeding part and the manual paper feeding part.

4. The shredder according to claim 1 , wherein the cutter is individually provided to shred paper sheets being supplied from the automatic paper feeding part and the manual feeding part.

5. The shredder according to claim 1 , wherein the supply protrusion protrudes from the outer circumference of the roller such that a plurality of paper sheets are conveyed at a time.

6. The shredder according to claim 1 , wherein the automatic paper feeding part further comprises a pressing part pushing up paper sheets.

7. The shredder according to claim 1 , wherein the driving motor is operated by a sensor provided at an entrance of the paper feeding parts.

8. A shredder comprising:

a driving motor;

a connection part transmitting a dynamic force of the driving motor;

a cutter shredding paper sheets inputted by a dynamic force transmitted from the connection part;

a paper feeding tray on which a plurality of paper sheets are placed;

a pressing part pushing up paper sheets on the tray; and

a supply protrusion rotated by a dynamic force provided by the connection part and conveying a plurality of paper sheets at the opposite side to the pressing part;

wherein a receiving groove in which the supply protrusion is inserted is formed at the paper feeding tray.

9. The shredder according to claim 8 , wherein an end of the supply protrusion is protrudingly formed at an outer circumference of a roller.

10. The shredder according to claim 9 , wherein the roller is eccentrically formed.

11. The shredder according to claim 9 , wherein the roller is provided in plurality, and the supply protrusion is provided in plurality around an outer circumference of at least one of the plurality of rollers at regular intervals.

12. The shredder according to claim 8 , wherein an end of the supply protrusion is a pointed tip.

13. The shredder according to claim 8 , wherein a plurality of supply protrusions are formed.

14. The shredder according to claim 8 , wherein a stepped portion is formed at a lower end of the paper feeding tray in order to support paper sheets.

15. A shredder comprising:

a driving motor;

a connection part transmitting a dynamic force of the driving motor;

a cutter shredding paper sheets inputted by a dynamic force transmitted from the connection part;

a manual paper feeding part manually supplying paper sheets to the cutter;

an automatic paper feeding part having an automatic paper feeding roller rotated by a dynamic force supplied from the connection part, wherein the automatic paper feeding part comprises a paper feeding tray on which a plurality of paper sheets are placed; and

a supply protrusion formed at an outer circumference of the automatic paper feeding roller and conveying a plurality of paper sheets;

wherein a receiving groove in which the supply protrusion is inserted is formed at the paper feeding tray.

16. The shredder according to claim 15 , wherein the automatic paper feeding part further comprises:

a pressing part pushing up paper sheets on the paper feeding tray.

17. The shredder according to claim 15 , wherein the automatic paper feeding rollers are provided in plurality, and the supply protrusion is provided in plurality around an outer circumference of at least one of the plurality of automatic paper feeding rollers at regular intervals.

18. The shredder according to claim 15 , wherein an end of the supply protrusion is protrudingly formed at an outer circumference of the automatic paper feeding roller.

19. The shredder according to claim 15 , wherein an end of the supply protrusion is a pointed tip.