Sheet stack cutter and finisher having the same

1. A sheet stack cutter for cutting sheet stacks by means of a moving cutter edge and a stationary cutter edge disposed upward and downward along a predetermined cutting-plane line, comprising:

a sheet loading table for supporting the sheet stack,

a press means for pressing and holding the sheet stack on the sheet loading table,

a moving cutter edge disposed in a manner of moving in up and down cutting directions for cutting the sheet stack on the sheet loading table along the cutting-plane line,

a stationary cutter edge disposed to the side of the sheet loading table for pressing the moving cutter edge to cut the sheet stack,

a drive means for moving the moving cutter edge in up and down cutting directions, and

an apparatus frame furnished with the press means and the moving cutter edge,

wherein the press means is composed of a pressure member for pressing the sheet stack on the sheet loading table, a pressure spring for urging the pressure member to the side of the sheet stack, and a pressure releasing means for retreating the pressure member above the sheet loading table,

the stationary cutter edge is supported to the apparatus frame movably back and forth in a plane direction of the sheet loading table substantially crossing with the vertically cutting directions of moving the moving cutter edge, and an urging means suppresses the stationary cutter edge to the side of the moving cutter edge, and

the pressure member and the stationary cutter edge are disposed such that pressure of the pressure member by the pressure spring acts on the stationary cutter edge, and the stationary cutter edge is restrained from moving in the direction crossing with cutting by pressure of the pressure member.

2. The sheet stack cutter for cutting sheet stacks as set forth in claim 1 , wherein the stationary cutter edge is secured integrally to the sheet loading table, the stationary cutter edge and the sheet loading table are supported by the apparatus frame movably back and forth in the plane direction of the sheet loading table on the sheet loading table.

3. The sheet stack cutter for cutting sheet stacks as set forth in claim 1 , wherein the moving cutter edge and the stationary cutter edge have the edges of the blades inclining at a predetermined angle one to the other in the vertically cutting directions, such that the sheet loading table gradually cut the sheet stack from one end to the other end along the cutting-plane line.

4. The sheet stack cutter for cutting sheet stacks as set forth in claim 3 , wherein the moving cutter edge and the stationary cutter edge are disposed to incline at a predetermined angle one to the other in a manner of both crossing with cutting-plane line each other, and

a shift means is provided to move the sheet loading table in a sheet surface direction for gradually cutting the sheet stack on the sheet loading table by the moving cutter edge from one end to the other.

5. The sheet stack cutter for cutting sheet stacks as set forth in claim 4 , wherein the shift means has a cam member which moves in parallel in the sheet surface direction, following the moving of the cutting direction of the moving cutter edge.

6. The sheet stack cutter for cutting sheet stacks as set forth in claim 1 , wherein the moving cutter edge and the pressure member are disposed to respectively move vertically at predetermined strokes with respect to the apparatus frame,

the moving cutter edge is connected to a drive means having a drive motor vertically moving between a waiting position separating from the sheet stack on the sheet loading table and a cutting position cutting the sheet stack,

the pressure member has the pressure spring in relation with the apparatus frame to press the sheet stack on the sheet loading table, and

the pressure member is engaged with the moving cutter edge from the actuating position pressing the sheet stack on the sheet loading table, following the moving cutter edge, to the waiting position separating above of the sheet stack.

7. The sheet stack cutter for cutting sheet stacks as set forth in claim 1 , wherein the apparatus frame is composed of a base plate disposed in the direction substantially crossing with the sheet stack on the sheet loading table, and the pressure plate disposed separately from the base plate,

the pressure member and the moving cutter edge are respectively supported as vertically movable between the base plate and the pressure plate,

the base plate is provided with a pair of drive rotation arms connected to the drive motor, and

the moving cutter edge is connected to the drive rotation arms as vertically movable in the cutting direction.

8. The sheet stack cutter for cutting sheet stacks as set forth in claim 7 , wherein the pair of drive rotation arms are disposed with a movement restraining means for restraining the pressure member from moving down by action of the pressure spring under a condition stopping the drive motor.

9. A finisher apparatus, comprising:

the sheet stack cutter as set forth in claim 1 ,

a tray means for accumulating in stacks sheets successively supplied,

a stack binding means for binding the sheet stack from the tray means, and

a sheet stack cutter for cutting the sheet stack bound by the stack binding means.