Sheet processing apparatus, image forming apparatus, and image forming system
A sheet processing apparatus sandwiches a sheet media in a two-ply sheet in which two sheets are overlaid and bonded together at a portion of the two-ply sheet. The sheet processing apparatus includes a fixing device, a tray, and a roller. The fixing device applies heat and pressure to the two-ply sheet. The tray is disposed downstream from the fixing device in a conveyance direction of the two-ply sheet, to stack the two-ply sheet. The roller conveys the two-ply sheet vertically downward toward the tray after the two-ply sheet passes through the fixing device.
1. A sheet processing apparatus configured to sandwich a sheet media in a two-ply sheet in which two sheets are overlaid and bonded together at a portion of the two-ply sheet, the sheet processing apparatus comprising:
thermal pressure rollers configured to apply heat and pressure to the two-ply sheet;
a tray disposed downstream from the thermal pressure rollers in a conveyance direction of the two-ply sheet, to stack the two-ply sheet; and
ejection rollers configured to convey the two-ply sheet vertically downward toward the tray after the two-ply sheet passes through the thermal pressure rollers,
wherein the ejection rollers are configured to stop a conveyance of the two-ply sheet after a trailing end of the two-ply sheet passes through the thermal pressure rollers, and restart the conveyance of the two-ply sheet after a predetermined time has elapsed, and
while the ejection rollers stop in a state in which the trailing end of the two-ply sheet is held between the ejection rollers, a downstream portion of the two-ply sheet, which is downstream from the ejection rollers in the conveyance direction, hangs down in a vertical direction in a state in which the downstream portion is not held between the ejection rollers.
2. The sheet processing apparatus according to claim 1 , further comprising a plurality of rollers disposed upstream from the thermal pressure rollers in the conveyance direction and configured to convey the two-ply sheet vertically downward until a leading end of the two-ply sheet in the conveyance direction reaches the thermal pressure rollers and the trailing end of the two-ply sheet in the conveyance direction passes through the thermal pressure rollers.
3. The sheet processing apparatus according to claim 1 ,
wherein a distance from the thermal pressure rollers to a stacking surface of the tray on an extension line of a conveyance path or an uppermost surface of the two-ply sheet stacked on the tray is longer than a length of the two-ply sheet.
4. The sheet processing apparatus according to claim 1 , wherein the ejection rollers are disposed downstream from the thermal pressure rollers in the conveyance direction.
5. The sheet processing apparatus according to claim 4 ,
wherein a distance between a vertical line passing through a nip between the ejection rollers and a contact point between a leading end of the two-ply sheet being ejected and a stacking surface of the two-ply sheet is less than or equal to 30 millimeters until the trailing end of the two-ply sheet passes through the thermal pressure rollers.
6. The sheet processing apparatus according to claim 4 ,
wherein the ejection rollers are configured to increase a rotation speed after the trailing end of the two-ply sheet passes through the thermal pressure rollers.
7. An image forming apparatus comprising:
an image forming device configured to form an image on a sheet medium; and
the sheet processing apparatus according to claim 1 .
8. An image forming system comprising:
an image forming apparatus configured to form an image on a sheet medium; and
the sheet processing apparatus according to claim 1 .
9. The sheet processing apparatus according to claim 1 ,
wherein the predetermined time changes depending on a size of the two-ply sheet.
10. The sheet processing apparatus according to claim 1 , further comprising a timer configured to set the predetermined time during which the conveyance of the two-ply sheet is stopped based on a size of the two-ply sheet.
11. The sheet processing apparatus according to claim 1 , further comprising a timer configured to set the predetermined time during which the conveyance of the two-ply sheet is stopped.
12. A sheet processing apparatus configured to sandwich a sheet media in a two-ply sheet in which two sheets are overlaid, the sheet processing apparatus comprising:
thermal pressure rollers configured to apply heat and pressure to the two-ply sheet;
a tray disposed downstream from the thermal pressure rollers in a conveyance direction of the two-ply sheet, to stack the two-ply sheet; and
ejection rollers configured to convey the two-ply sheet vertically downward toward the tray after the two-ply sheet passes through the thermal pressure rollers,
wherein the ejection rollers are configured to stop a conveyance of the two-ply sheet after a trailing end of the two-ply sheet passes through the thermal pressure rollers, and restart the conveyance of the two-ply sheet after a predetermined time has elapsed, and
while the ejection rollers stop in a state in which the trailing end of the two-ply sheet is held between the ejection rollers, a downstream portion of the two-ply sheet, which is downstream from the ejection rollers in the conveyance direction, hangs down in a vertical direction in a state in which the downstream portion is not held between the ejection rollers.
13. An image forming apparatus comprising:
an image forming device configured to form an image on a sheet medium; and
the sheet processing apparatus according to claim 12 .
14. An image forming system comprising:
an image forming apparatus configured to form an image on a sheet medium; and
the sheet processing apparatus according to claim 12 .