Claims
- 1. A sheet convey apparatus, comprising:
- convey means for conveying a sheet in a convey direction;
- a pair of rollers arranged downstream of said convey means in the convey direction for conveying a sheet in the convey direction or in a reverse direction by rotation of said pair of rollers in the convey direction or in the reverse direction; and
- control means for controlling said convey means and said pair of rollers in such a manner that, after a sheet is conveyed by said pair of rollers in the convey direction by a predetermined amount past a nip between said pair of rollers, said pair of rollers are rotated in the reverse direction while applying a conveying force in the convey direction to the sheet with said convey means, said convey means allowing a part of the sheet which contacts said convey means to shift in the reverse direction when said pair of rollers rotate in the reverse direction, thereby conveying the sheet in the reverse direction until the sheet passes through the nip between said pair of rollers.
- 2. A sheet convey apparatus according to claim 1, wherein said convey means has a convey roller.
- 3. A sheet convey apparatus according to claim 2, wherein said convey roller has a spring member for urging said convey roller against the sheet and accumulating the conveying force which is applied to the sheet by said spring member, when said pair of rollers are being rotated in the reverse direction.
- 4. A sheet convey apparatus according to claim 3, wherein said spring member connects said convey roller to a support shaft and accumulates a force for rotating said convey roller.
- 5. A sheet convey apparatus according to claim 3, wherein said convey roller is shiftably supported for shifting in said convey direction or in said reverse direction, and said spring member biases said convey roller toward the convey direction.
- 6. A sheet convey apparatus according to claim 2, wherein, during rotation of said pair of rollers in the reverse direction, said convey roller is rotated in the convey direction while slipping relative to the sheet.
- 7. A sheet convey apparatus according to claim 1, wherein said pair of rollers is controlled by said control means in such a manner that, after the sheet is conveyed until the sheet passes through the nip between said pair of rollers, said pair of rollers are rotated in the convey direction to convey the sheet in the convey direction.
- 8. A sheet supply apparatus, comprising:
- a supply rotary member for supplying a sheet in a convey direction;
- a pair of convey rotary members rotatable in the convey direction or a reverse direction for pinching and conveying a sheet supplied by said supply rotary member in the convey direction when rotated in the convey direction; and
- control means for controlling said supply rotary member and said pair of convey rotary members in such a manner that said supply rotary member is rotated in the convey direction to supply a sheet in the convey direction, so that a tip end of the sheet is abutted against a nip between said pair of convey rotary members being rotated in the reverse direction, then said supply rotary member is rotated in the convey direction while slipping relative to the sheet after the tip end of the sheet is abutted against said nip, thereby continuing to apply a conveying force to the sheet, and then said pair of convey rotary members are rotated in the convey direction.
- 9. A sheet supply apparatus according to claim 8, wherein said supply rotary member is separated from the sheet when a supply operation is finished.
- 10. A sheet supply apparatus, comprising:
- supply means for supplying a sheet in a convey direction;
- a pair of rollers arranged downstream of said supply means in the convey direction for conveying a sheet in the convey direction or in a reverse direction by rotation of said pair of rollers in the convey direction or in the reverse direction; and
- control means for controlling said supply means and said pair of rollers in such a manner that said supply means rotates in the convey direction to convey a sheet to be conveyed in the convey direction so that the sheet is abutted against a nip between said pair of rollers being rotated in the reverse direction, then said supply means continues to rotate in the convey direction after abutment of the sheet against the nip between said pair of rollers to transmit a conveying force to the sheet and so that the sheet slips relative to said Supply means, and then said pair of rollers rotate in the convey direction.
- 11. A sheet supply apparatus according to claim 10, wherein said control means has a drive source, and transmission means for transmitting a driving force from said drive source to said supply means and to said pair of rollers.
- 12. A sheet supply apparatus according to claim 11, wherein said transmission means has a sun gear, and a planetary gear meshed with said sun gear and meshed with a notched gear connected to said supply means directly or via an idle gear.
- 13. A sheet supply apparatus according to claim 12, wherein said notched gear connected to said supply means is a notched gear having a non-toothed portion formed on a portion of a peripheral surface of said notched gear.
- 14. A sheet supply apparatus according to claim 13, wherein said planetary gear or said idle gear transmits the driving force until said planetary gear or said idle gear faces said non-toothed portion of said notched gear.
- 15. A sheet supply apparatus according to claim 14, wherein said supply means has a supply portion for contacting the sheet and a non-supply portion for not contacting the sheet, and, when said planetary gear faces said non-toothed portion of said notched gear, said non-supply portion of said supply means faces the sheet.
- 16. A recording apparatus, comprising:
- convey means for conveying a sheet in a convey direction;
- a pair of rollers arranged downstream of said convey means in said convey direction for conveying a sheet in the convey direction or in a reverse direction by rotation of said pair of rollers in the convey direction or in the reverse direction;
- control means for controlling said convey means and said pair of rollers in such a manner that, after a sheet is conveyed by said pair of rollers in the convey direction by a predetermined amount past a nip between said pair of rollers, said pair of rollers are rotated in the reverse direction while applying a conveying force in the convey direction to the sheet by said convey means, said convey means allowing a part of the sheet which contacts said convey means to shift in the reverse direction when said pair of rollers rotate in the reverse direction, thereby conveying the sheet in the reverse direction until the sheet passes through the nip between said pair of rollers; and
- recording means for recording an image on a sheet conveyed by said pair of rollers.
- 17. A recording apparatus according to claim 16, wherein said recording means has an ink jet head.
- 18. A recording apparatus according to claim 17, wherein said ink jet head discharges ink by utilizing thermal energy.
- 19. A recording apparatus, comprising:
- a supply rotary member for supplying a sheet in a convey direction;
- a pair of convey rotary members rotatable in a convey direction or a reverse direction for pinching and conveying a sheet supplied by said supply rotary member in the convey direction when rotated in the convey direction;
- control means for controlling said supply rotary member and said pair of convey rotary members in such a manner that said supply rotary means is rotated to supply a sheet in the convey direction, so that a tip end of the sheet is abutted against a nip between said pair of convey rotary members being rotated in the reverse direction, then said supply rotary member is rotated in the convey direction while slipping relative to the sheet after the tip end of the sheet is abutted against said nip, thereby continuing to apply a conveying force to the sheet, and then said pair of convey rotary members are rotated in the convey direction; and
- recording means for recording an image on a sheet conveyed by said pair of convey rollers.
- 20. A recording apparatus according to claim 19, wherein said recording means has an ink jet head.
- 21. A recording apparatus according to claim 20, wherein said ink jet head discharges ink by utilizing thermal energy.
- 22. A recording apparatus, comprising:
- supply means for supplying a sheet in a convey direction;
- a pair of rollers arranged downstream of said supply means in the convey direction for conveying a sheet in the convey direction or in a reverse direction by rotation of said pair of rollers in the convey direction or in the reverse direction;
- control means for controlling said supply means and said pair of rollers in such a manner that said supply means rotates in the convey direction to convey a sheet to be conveyed in the convey direction so that the sheet is abutted against a nip between said pair of rollers being rotated in the reverse direction, then said supply means continues to rotate in the convey direction after abutment of the sheet against the nip between said pair of rollers to transmit a conveying force to the sheet and so that the sheet slips relative to said supply means, and then said pair of rollers rotate in the convey direction; and
- recording means for recording an image on a sheet conveyed by said pair of rollers.
- 23. A recording apparatus according to claim 22, wherein said recording means has an ink jet head.
- 24. A recording apparatus according to claim 23, wherein said ink jet head discharges ink by utilizing thermal energy.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-361209 |
Dec 1992 |
JPX |
|
5-106825 |
May 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/174,008, filed Dec. 28, 1993, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
487923 |
Jun 1992 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
174008 |
Dec 1993 |
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