Image forming apparatus to which a sheet discharge device can be detachably mounted

• US 7,146,113 B2
• Filed: 06/14/2004
• Issued: 12/05/2006
• Est. Priority Date: 06/16/2003
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kitamura, Toshifumi
• Primary Examiner(s): Gray, David M.
• Assistant Examiner(s): GLEITZ, RYAN M
• Application Number:
  US10/868,584
• Publication Number:
  US 20040253009A1
• Time in Patent Office: 904 Days
• Field of Search: 399/13, 399/396, 399/401, 399405-410
• US Class Current: 399/13
• CPC Class Codes: G03G 15/234 by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters
• CPC Class Codes: G03G 15/6529 Transporting G03G15/6555 takes precedence

Abstract

An image forming apparatus is provided which includes an image formation unit for forming images on a recording medium; a first transporting path for discharging a recording medium to a sheet discharge device; a longer second transporting path for reversing the transportation direction of the recording medium; a transporting path switching unit for switching between the first transporting path or the second transporting path; a setting unit for setting the discharge speed for discharging the recording medium from the first and second transporting paths to a recording sheet stacking unit, and also setting the reverse transportation speed; and a determining unit for determining whether or not the sheet discharge device has been connected to the image forming apparatus; wherein the setting unit sets a first discharge speed slower than the reverse transportation speed in the event that the sheet discharge device has not been connected, and otherwise sets a faster second discharge speed.

Claims

1. An image forming apparatus to which a sheet discharge device can be detachably mounted, said apparatus comprising:

an image formation unit for forming images on a recording medium;

a first transporting path for discharging a recording medium from said image formation unit to said sheet discharge device;

a second transporting path for reversing the transportation direction of said recording medium so as to be discharged to said sheet discharge device, said second transporting path being longer than said first transporting path for discharging a recording medium from said image formation unit to said sheet discharge device;

a transporting path switching unit for switching between transporting said recording medium to said first transporting path or said second transporting path;

a setting unit for setting the discharge speed for discharging said recording medium from said first transporting path and said second transporting path to a recording sheet stacking unit, and also setting the reverse transportation speed for reversing said recording medium in said second transporting path; and

a determining unit for determining whether or not said sheet discharge device has been connected to said image forming apparatus;

wherein said setting unit sets said discharge speed to a first discharge speed which is slower than said reverse transportation speed in the event that determination is made by said determining unit that said sheet discharge device has not been connected to said image forming apparatus; and

wherein said setting unit sets said discharge speed to a second discharge speed which is faster than said first discharge speed in the event that determination is made by said determining unit that said sheet discharge device has been connected to said image forming apparatus.

2. An image forming apparatus according to claim 1, wherein said second discharge speed is a speed corresponding to the sheet discharge device mounted to said image forming apparatus.

3. An image forming apparatus according to claim 1, wherein said sheet discharge device includes a device for straightening or stapling sheets of said recording medium.

4. An image forming apparatus according to claim 1, wherein said setting unit sets a third speed which is faster than the image formation speed at said image formation unit and slower than said reversal transportation speed, in the event of transporting said recording medium from said image transporting unit to said second transporting path.

5. A control method for an image forming apparatus to which a sheet discharge device can be detachably mounted and comprises

an image formation unit for forming images on a recording medium,

a first transporting path for discharging a recording medium from said image formation unit to said discharge device, and

a second transporting path for reversing the transportation direction of said recording medium so as to be discharged to said sheet discharge device, said second transporting path being longer than said first transporting path for discharging a recording medium from said image formation unit to said sheet discharge device;

said method comprising;

a judging step for judging, based on printing information, whether to transport said recording medium to said first transporting path or to said second transporting path;

a reversal transportation step for transporting said recording medium in reverse at a speed faster than the image formation speed in the event of transporting said recording medium to said second transporting path;

a determining step for determining whether or not said sheet discharge device is connected to said image forming apparatus; and

a speed changing step for changing said discharging speed of said recording medium to a speed which is different from said reversal transportation speed, according to whether or not said sheet discharge device has been determined to have been connected in said determining step.

6. An image formation control method according to claim 5, wherein said speed changing step sets said discharge speed to a first discharge speed which is slower than said reverse transportation speed in the event that determination is made in said determining step that said sheet discharge device has not been connected to said image forming apparatus, and sets said discharge speed to a second discharge speed which is faster than said first discharge speed in the event that determination is made in said determining step that said sheet discharge device has been connected to said image forming apparatus.

7. An image formation control method according to claim 5, further comprising a transporting step for transporting said recording medium from said image formation unit to said second transporting path at a speed which is slower than said reversal transporting speed and faster than said image formation speed.

8. An image formation control method according to claim 5, wherein said sheet discharge device includes a device for straightening or stapling sheets of said recording medium.

9. An image forming apparatus to which a sheet discharge device can be detachably mounted, said apparatus comprising:

an image formation unit for forming images on a recording medium;

a transporting path for discharging a recording medium from said image formation unit to said sheet discharge device;

a setting unit for setting the discharge speed for discharging said recording medium from said transporting path to a recording medium stacking unit; and

a determining unit for determining whether or not said sheet discharge device has been connected to said image forming apparatus;

wherein said setting unit sets said discharge speed to a first discharge speed in the event that determination is made by said determining unit that said sheet discharge device has not been connected to said image forming apparatus; and

wherein said setting unit sets said discharge speed to a second discharge speed which is faster than said first discharge speed in the event that determination is made by said determining unit that said sheet discharge device has been connected to said image forming apparatus.

10. An image forming apparatus according to claim 9, wherein said second discharge speed is a speed corresponding to the sheet discharge device mounted to said image forming apparatus.

11. An image forming apparatus according to claim 9, wherein said sheet discharge device includes a device for straightening or stapling sheets of said recording medium.

12. A control method for an image forming apparatus to which a sheet discharge device can be detachably mounted, said method comprising:

a determining step for determining whether or not said sheet discharge device has been connected to said image forming apparatus;

a step for setting the discharge speed of said recording medium to a first discharge speed in the event that determination is made in said determining step that said sheet discharge device has not been connected to said image forming apparatus; and

a step for setting said discharge speed of said recording medium to a second discharge speed which is faster than said first discharge speed in the event that determination is made in said determining step that said sheet discharge device has been connected to said image forming apparatus.

13. An image forming apparatus to which a sheet discharge device can be detachably mounted, the apparatus comprising:

an image formation portion configured to form images on a recording medium at an image formation speed;

a first transporting path configured to discharge a recording medium from the image formation portion to the sheet discharge device;

a second transporting path configured to reverse the transportation direction of the recording medium so as to be discharged to the sheet discharge device, the second transporting path being longer than the first transporting path for discharging a recording medium from the image formation portion to the sheet discharge device;

a transporting path switching member for switching between transporting the recording medium to the first transporting path or the second transporting path;

a setting portion configured to set a discharge speed for discharging the recording medium from the first transporting path and the second transporting path to a recording sheet stacking unit, and also configured to set a reverse transportation speed for reversing the recording medium in the second transporting path; and

a determining unit configured to determine whether or not the sheet discharge device has been connected to the image forming apparatus;

wherein the reverse transportation speed is faster than the image forming speed,

wherein when the sheet is discharged from the second transporting path, the setting portion sets the discharge speed to a first speed which is slower than the reverse transportation speed in the event that a determination is made that the sheet discharge device has not been connected to the image forming apparatus, and the setting portion sets the discharge speed to a second speed which corresponds to a processing time of the sheet discharge device in the event that a determination is made that the sheet discharge device has been connected to the image formation apparatus.

14. The image forming apparatus according to claim 13, wherein the sheet discharge device includes a device for straightening or stapling sheets of the recording medium.

15. A control method for an image forming apparatus to which a sheet discharge device can be detachably mounted, the image forming apparatus including an image formation unit configured to form images on a recording medium;

a first transporting path configured to discharge a recording medium from the image formation unit to the discharge device; and

a second transporting path configured to reverse the transportation direction of the recording medium so as to be discharged to the sheet discharge device, the second transporting path being longer than the first transporting path for discharging a recording medium from the image formation unit to the sheet discharge device, the method comprising;

judging, based on printing information, whether to transport the recording medium to the first transporting path or to the second transporting path;

transporting the recording medium in reverse at a reverse transportation speed faster than the image formation speed in the event of transporting the recording medium to the second transporting path;

determining whether or not the sheet discharge device is connected to the image forming apparatus;

setting a sheet discharge speed to a first transportation speed which is lower than the reverse transportation speed in the event that a determination is made that the sheet discharge device has not been connected to the image forming apparatus; and

setting the sheet discharge speed to a second transportation speed which corresponds to a processing time of the sheet discharge device in the event that a determination is made that the sheet discharge device has been connected to the image forming apparatus.

16. The image formation control method according to claim 15, further comprising transporting the recording medium from the image formation unit to the second transporting path at a speed which is slower than the reverse transportation speed and faster than the image formation speed.

17. The image formation control method according to claim 16, wherein the sheet discharge device includes a device for straightening or stapling sheets of the recording medium.

18. An image forming apparatus to which a sheet discharge device can be detachably mounted, the apparatus comprising:

an image formation portion configured to form images on a recording medium;

a transporting path configured to discharge a recording medium from the image formation portion to the sheet discharge device;

a setting portion configured to set a discharge speed for discharging the recording medium from the transporting path to a recording medium stacking unit; and

a determining unit configured to determine whether or not the sheet discharge device has been connected to the image forming apparatus;

wherein the setting portion sets the discharge speed to a first discharge speed in the event that a determination is made that the sheet discharge device has not been connected to the image formation apparatus,

wherein the setting portion sets the discharge speed to a second discharge speed which corresponds to a processing time of the sheet discharge device in the event that a determination is made that the discharge device has been connected to the image forming apparatus.

19. An image forming apparatus according to claim 18, wherein the sheet discharge device includes a device for straightening or stapling sheets of the recording medium.

20. A control method for an image forming apparatus to which a sheet discharge device can be detachably mounted, the method comprising:

determining whether or not the sheet discharge device has been connected to the image forming apparatus;

setting the discharge speed of the recording medium to a first discharge speed in the event that determination is made that the sheet discharge device has not been connected to the image forming apparatus; and

setting the discharge speed to a second discharge speed which corresponds to a processing time of the sheet discharge in the event that a determination is made that the sheet discharge device has been connected to the image forming apparatus.