SHEET CONVEYANCE APPARATUS, SHEET PROCESSING APPARATUS, AND IMAGE FORMING APPARATUS

Abstract

A presser member which abuts on a sheet which passes through a sheet conveyance path, and rotates toward a sheet conveyance direction while being pressed by the sheet is provided rotatably in the sheet conveyance path where the sheet conveyed to a sheet stack portion passes, and a move portion to which this presser member is retracted from the sheet conveyance path is provided. When drawing out a jammed sheet from the sheet conveyance path in a direction reverse in a sheet conveyance direction, a jam recovery door is opened, the move portion is operated in connection with this opening motion, and the presser member is retracted from the sheet conveyance path.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating schematic construction of an image forming apparatus including a sheet processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram for describing construction of the above-described sheet processing apparatus.

FIG. 3 is a sectional diagram for describing construction of the above-described sheet processing apparatus.

FIG. 4 is a perspective view of the above-described sheet processing apparatus.

FIG. 5 is another perspective view of the above-described sheet processing apparatus.

FIGS. 6A and 6B are first diagrams for describing operations of a first presser member and a second presser member, which are provided in the above-described sheet processing apparatus, at the time of a sheet carrying-in.

FIGS. 7A and 7B are second diagrams for describing operations of a first presser member and a second presser member, which are provided in the above-described sheet processing apparatus, at the time of a sheet carrying-in.

FIG. 8 is a first diagram of describing recovery at the time of a sheet jam in the above-described sheet processing apparatus.

FIG. 9 is a second diagram of describing recovery at the time of a sheet jam in the above-described sheet processing apparatus.

FIG. 10 is a third diagram of describing recovery at the time of a sheet jam in the above-described sheet processing apparatus.

FIG. 11 is a first diagram of describing recovery at the time of a two-sheets jam in the above-described sheet processing apparatus.

FIG. 12 is a second diagram of describing recovery at the time of a two-sheets jam in the above-described sheet processing apparatus.

FIG. 13 is a third diagram of describing recovery at the time of a two-sheets jam in the above-described sheet processing apparatus.

FIG. 14 is a diagram illustrating schematic construction of a sheet processing apparatus according to a second embodiment of the present invention.

FIG. 15 is a diagram illustrating schematic construction of a sheet processing apparatus according to third and fourth embodiments of the present invention.

FIG. 16 is a diagram for describing construction of a conventional sheet processing apparatus.

Claims

1. A sheet conveyance apparatus which conveys a sheet, including: a sheet conveyance path through which a sheet passes;a moving member which is movably provided in the sheet conveyance path;a move portion which retracts the moving member from the sheet conveyance path; anda cover member which opens to expose the sheet conveyance path, wherein the move portion moves the moving member to an retracting position from the sheet conveyance path in a direction opposed to the opening direction of the cover member according to opening of the cover member.

2. A sheet conveyance apparatus according to claim 1, wherein the move portion includes an upper guide member, constructs the sheet conveyance path, which holds the moving member movably and is movable in a direction of opening the sheet conveyance path, and moves the upper guide member in a direction of opening the sheet conveyance path according to opening of the cover member and moves the moving member to the retracting position from the sheet conveyance path with movement of the upper guide member.

3. A sheet conveyance apparatus according to claim 2, further comprising: an abutting section which abuts on the moving member with movement of the upper guide member to move the moving member in the retracting position.

4. A sheet conveyance apparatus according to claim 2, further including: a sheet conveying roller pair which is provided in the sheet conveyance path, and conveys a sheet to the sheet stack section; anda lower guide member which constructs the sheet conveyance path with the upper guide member, and holds one of the sheet conveying roller pair, wherein the lower guide member is movable so that one of the sheet conveying roller pair may separate from another with opening of the cover member.

5. A sheet conveyance apparatus according to claim 4, further including: a link member which moves the lower guide member according to opening of the cover member.

6. A sheet conveyance apparatus according to claim 1, further comprising: a detecting portion which detects an opening of the cover member,wherein the move section moves the moving member to an retracting position from the sheet conveyance path according to an opening detection signal of the detecting portion.

7. A sheet conveyance apparatus according to claim 1, wherein the moving member is a presser member which presses down sheets stacked on the sheet stack portion.

8. A sheet conveyance apparatus according to claim 1, wherein the moving member is a sheet detecting lever which detects transit of a sheet in the sheet conveyance path.

9. A sheet conveyance apparatus according to claim 1, wherein the cover member exposes said sheet conveyance path in the upstream from the moving member in the sheet conveyance direction.

10. A sheet conveyance apparatus according to claim 1, wherein the cover member is at least a part of said sheet conveyance path with the upper guide member, and at least a part of said sheet conveyance path with a guide member.

11. An image forming apparatus, including: an image forming portion which forms an image; andthe sheet conveyance apparatus according to claim 1 which conveys a sheet on which an image is formed by the image forming portion.

12. A sheet processing apparatus, including: the sheet conveyance apparatus according to claim 1 which conveys a sheet to the sheet stack portion; anda sheet processing unit which gives processing to sheets stacked on the sheet stack portion.

13. An image forming apparatus, including: an image forming portion which forms an image; andthe sheet processing apparatus according to claim 12 which gives processing to a sheet on which an image is formed by the image forming portion.

14. An image forming apparatus, including: an image forming portion which forms an image;an image scanner which is arranged with keeping an interval above the image forming portion; andthe sheet processing apparatus according to claim 12 which is arranged in a space formed between the image forming portion and the image scanner, and which gives processing to a sheet on which an image is formed by the image forming portion.

15. A sheet conveyance apparatus which conveys a sheet, including: a sheet conveyance path through which a sheet passes;a moving member which is movably provided in the sheet conveyance path;a move portion which retracts the moving member from the sheet conveyance path; anda jam detecting portion which detects a sheet jam, wherein the move section moves the moving member to an retracting position from the sheet conveyance path according to a jam detection signal of the jam detecting portion.

16. A sheet conveyance apparatus according to claim 15, wherein the moving member is a presser member which presses down sheets stacked on the sheet stack portion.

17. A sheet conveyance apparatus according to claim 15, wherein the moving member is a sheet detecting lever which detects transit of a sheet in the sheet conveyance path.

18. An image forming apparatus, including: an image forming portion which forms an image; andthe sheet conveyance apparatus according to claim 15 which conveys a sheet on which an image is formed by the image forming portion.

19. A sheet processing apparatus, including: a sheet conveyance apparatus according to claim 15 which conveys a sheet to the sheet stack portion; anda sheet processing unit which gives processing to sheets stacked on the sheet stack portion.

20. An image forming apparatus, including: an image forming portion which forms an image; andthe sheet processing apparatus according to claim 19 which gives processing to a sheet on which an image is formed by the image forming portion.

21. An image forming apparatus, including: an image forming portion which forms an image;an image scanner which is arranged with keeping interval above the image forming portion; andthe sheet processing apparatus according to claim 19 which is arranged in a space formed between the image forming portion and the image scanner, and which effects processing to a sheet on which an image is formed by the image forming portion.