Sheet cutting device and image forming apparatus equipped therewith

A sheet cutter for finishing a booklet, comprising:

• (a) a cutting means for cutting edges of a bundle of sheets folded double;
• (b) a conveyance means provided in a cutting section for conveying the booklet whose edges have been cut by the cutting means;
• (c) a rotatable roller with a large diameter provided downstream in a sheet conveyance direction of the cutting means, for deflecting the booklet to a vertical direction from the conveyance means to convey to a booklet storing means;
• (d) a pinch roller for pressing the booklet against the rotatable roller to convey the booklet and for following the rotatable roller to rotate;
• and
• (e) a guide plate for deflecting the booklet to the vertical direction from the conveyance means to guide the booklet to an interposing position between the rotatable roller and the pinch roller.

A sheet cutter for finishing a booklet, comprising:

• (a) a cutting means for cutting edges of a bundle of sheets folded double;
• (b) a booklet ejection opening;
• (c) a booklet storing means having a booklet stand for accepting a plurality of booklets each whose edges have been cut by the cutting means, which has passed through the booklet ejection opening so that the booklets are stacked while sheet faces of the booklets are overlapped one another with a folded portion of each booklet facing upward;
• (d) a movable wall member for pressing the sheet face of the booklet supported to stand upright on the booklet stand and reciprocating between a topside of the booklet stand and the booklet ejection opening;
• and
• (e) a driving means for making the movable wall member to reciprocate,
• wherein the movable wall member accepts the booklet that is usually stacked at a stop position on the booklet stand, then, retreats to a rear position of the booklet ejection opening each time the booklet whose edges have been cut is conveyed to the booklet stand, and returns to the stop position while pressing the sheet face of the booklet to stand ready after the booklet finishes passing through the booklet ejection opening.

A sheet cutter for finishing a booklet, comprising:

• (a) a cutting means for cutting edges of a bundle of sheets folded double;
• (b) a booklet ejection opening;
• (c) a booklet storing means having a booklet stand for accepting a plurality of booklets each whose edges have been cut by the cutting means, which has passed through the booklet ejection opening so that the booklets are stacked while sheet faces of the booklets are overlapped one another with a folded portion of each booklet facing upward;
• (d) a movable wall member for pressing the sheet face of the booklet supported to stand upright on the booklet stand and reciprocating between a topside of the booklet stand and the booklet ejection opening;
• (e) a partition member provided to face the sheet face on the movable wall member and to be capable of moving in a direction perpendicular to the booklet stand;
• and
• (f) a driving means for making the movable wall member and the partition member to reciprocate,
• wherein the movable wall member accepts the booklet that is usually loaded at a stop position on the booklet stand, then, retreats to a rear position of the booklet ejection opening each time a booklet whose edges have been cut is conveyed to the booklet stand, and before the movable wall member retreats for accepting the booklet and the booklet ejection opening is opened, the partition member moves to a position where an end portion of the booklet is accepted in place of the movable wall member, and when the movable wall member moves to the stop position while pressing the sheet face of the booklet, the partition member starts moving to retreat so that the booklet stand can accept the booklet.

A sheet cutter for finishing a booklet, comprising:

• (a) a cutting means for cutting edges of a bundle of sheets folded double;
• (b) a booklet storing means having a booklet stand on which a plurality of booklets each whose edges have been cut by the cutting means are accepted while sheet faces of the booklets are overlapped one another with a folded portion of each booklet facing upward;
• (c) a movable pressure wall member that is supported to stand upright on the booklet stand, for pressing the sheet face of the booklet stacked on the booklet stand;
• and
• (d) a coil-shaped constant load spring member composed of a long leaf spring that is coiled to urge the pressure wall member.

A sheet cutter for finishing a booklet, comprising:

• (a) a cutting means for cutting edges of a bundle of sheets folded double;
• (b) a booklet storing means having a booklet stand on which a plurality of booklets each whose edges have been cut by the cutting means are accepted while sheet faces of the booklets are overlapped one another with a folded portion of each booklet facing upward;
• (c) a movable wall member that is supported to stand upright on the booklet stand, for pressing the sheet face of the booklet stacked on the booklet stand and reciprocating on the booklet stand to support the sheet face of the booklet;
• and
• (d) a movable pressure wall member that faces the movable wall member for pressing the sheet face of a booklet stacked on the booklet stand,
• wherein the pressure wall member comprises:
• a pressure wall face section that stands upright on the booklet stand to be in parallel with a sheet supporting wall face of the opposing movable wall member for pressing the sheet face of the booklet, and
• an inclined surface section having an inclination angle in a direction wherein un upper part of the pressure wall face goes away from the sheet supporting wall face of the movable wall member.

A sheet cutter for finishing a booklet which has been folded double, comprising:

• (a) a cutting means for cutting edges of the booklet;
• (b) a conveyance means to convey the booklet;
• (c) a pressing means capable of ascending and descending, for pressing and separating a top face of the booklet placed on the conveyance means;
• (d) a ascending and descending means arranged below the conveyance means, for driving the pressing means to ascend and descend thereby to press and release the top face of the booklet;
• and
• (e) a driving means arranged below the conveyance means, for driving the ascending and descending means.

A sheet cutter for finishing a booklet which has been folded double, comprising:

• (a) a sheet cutting means for cutting edges of the booklet;
• (b) a conveyance means for conveying the booklet;
• (c) a movable stopper movable in parallel with a conveyance direction of the booklet, for stopping the booklet at a prescribed position at which the edges of the booklet are cut by the sheet cutting means;
• (d) a positioning means for positioning the movable stopper at the prescribed position in accordance with a booklet size;
• and
• (e) a control means for adjusting finely a position of the movable stopper from the prescribed position in accordance with the booklet size in accordance with the number of sheets of the booklet to be folded.

An image forming apparatus comprising:

• (a) a sheet feeding means for feeding a sheet;
• (b) an image forming means for forming an image on the sheet fed by the sheet feeding means;
• (c) a sheet finisher having a stapling means for center-stapling a bundle of sheets having a plurality of sheets on which the images are formed by the image forming means and a folding means for folding double the bundle of sheets subjected to center-stapling;
• and
• (d) a sheet cutter for finishing the booklet by cutting edges of the bundle of sheets subjected to folding double and center-stapling are cut by the cutting means;
• wherein the sheet cutter comprises a booklet storing means having a booklet stand for storing a plurality of booklets,
• wherein the plurality of booklets are stacked on the booklet stand while sheet faces of the booklets are overlapped one another with a folded portion of each booklet facing upward.