Sheet punching apparatus, sheet finishing apparatus, and image forming apparatus

1. A sheet punching apparatus comprising:

a transport unit for receiving a sheet,

a hole punching device for punching a hole in the sheet transported to the transport unit,

a punch scrap container for storing punch scraps after the hole punching device punches the hole,

a sweeping device for sweeping a top portion of the punch scraps stored in the punch scrap container to level the punch scraps,

a drive device for driving the sweeping device and the hole punching device commonly, and

a control device for controlling operational timing of the hole punching device and the sweeping device, wherein said control device controls the drive device so that the hole punching device and the sweeping device operate at a same time.

2. A sheet punching apparatus according to claim 1 , wherein said drive device includes a motor capable of rotating in forward and reverse directions and a clutch for transmitting a drive of the drive device to the sweeping device when the motor rotates in one of the forward and reverse directions.

3. A sheet finishing apparatus comprising: the sheet punching apparatus according to claim 1 , a discharge device for discharging the sheet after the hole punching device punches the hole, and a sheet storage device for storing the sheet after the discharge device discharges the sheet.

4. An image forming apparatus comprising: the sheet punching apparatus according to claim 1 , an image forming device for forming an image on the sheet, and a transport device for transporting the sheet after the image forming device forms the image.

5. A sheet punching apparatus according to claim 1 , further comprising a detection device for detecting one of a position of the sweeping device and a load applied onto the drive device to determine that the punch scrap container is full.

6. A sheet punching apparatus according to claim 5 , wherein said drive device further drives the punching device.

7. A sheet punching apparatus according to claim 5 , wherein said sweeping device includes a rotating shaft arranged above the punch scrap container and a sweeping member supported on the rotating shaft for sweeping the punch scraps.

8. A sheet punching apparatus according to claim 5 , wherein said sweeping device includes a slide member arranged above the punch scrap container and a sweeping member supported on the slide member for sweeping the punch scraps.

9. A sheet finishing apparatus comprising the sheet punching apparatus according to claim 5 , a discharge device for discharging the sheet after the hole punching device punches the hole, and a sheet storage device for storing the sheet after the discharge device discharges the sheet.

10. An image forming apparatus comprising the sheet punching apparatus according to claim 5 , an image forming device for forming an image on the sheet, and a transport device for transporting the sheet after the image forming device forms the image.