JPH10315184A - Sheet cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To beautifully cut a sheet without leaving an uncut part and without being cut into fine strips when the sheet is cut by bringing a movable blade into pressure contact with a fixed blade in a condition where a meshing surface inclines in the direction in which the tip becomes distant from an opposed surface of the fixed blade. SOLUTION: A fixed blade 7 having a straight blade part 7a is fixed in a housing 1, and a movable blade 8 is opposed to the fixed blade 7 in a meshing surface 8a on the fixed blade. The movable blade 8 has an edge part 8a formed in a V shape whose central part is retreated to the straight blade part 7a. A pressing end part 9a is projected in parallel to the straight blade part 7a on the tip of a movable blade pressure contact member 9, and the meshing point vicinity of the movable blade 8 and the fixed blade 7 is pressed, and an edge part 8e is strongly brought into pressure contact with the straight blade part 7a, and the movable blade 8 inclines by a thickness of the fixed blade 7 in the direction in which the edge part 8e becomes distant. When the movable blade 8 advances by a movable blade driving means 6 or the like, the edge part 8e moves toward the center from its both ends. Therefore, a sheet can be cut in a beautiful cutting surface with a light moving load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a sheet cutter for cutting sheets such as paper and plastic film in an apparatus such as a printer or a ticket issuing machine.

[0002]

2. Description of the Related Art As a conventional sheet cutter of this type for cutting a sheet using a fixed blade and a movable blade, an entire movable blade is pressed against a fixed blade by a press-contact spring to press the movable blade. There has been a structure in which the fixed blade and the movable blade are engaged with each other while the tip of the blade tip portion is in contact with the fixed blade, and the sheet between the fixed blade and the movable blade is cut. For example, "Japanese Patent Publication No. 8-22517", "Actual Fair Publication 7-11907", and "Japanese Patent Publication No. 8-5030".

[0003] Next, as a conventional example, the above-mentioned "Tokoku 8-22"
517 "will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is a perspective view of a conventional sheet cutter. FIG. 10 is a detailed view showing the state of the upper surface of the fixed blade and the state of the movable blade cut at the position of the upper surface of the fixed blade in FIG. 9.

The movable blade 508 is made of a heat-treated carbon tool steel having a thickness of 0.5 mm, has a V-shaped recessed edge 508 e having a blade width of 80 mm, and has a vertical direction (shear direction) on a frame 511. ) Is slidably mounted. A fixed blade 507 is fixed to the frame 511, and a fixed blade edge 507b is formed on the fixed blade 507. The fixed blade edge 507b is approximately 0. It has a convex warpage of 25 mm. The fixed blade 507 is rotatably supported by support shafts 507c at both ends, and is pressed against the movable blade 508 by a pressing member 512. When the movable blade 508 moves downward, the sheet (not shown) sent through the sheet passage opening 501c provided in the frame 511 is cut from both ends toward the center, and the cutting ends at the center.
Since the fixed blade edge 507b has a slightly convex central portion and is pressed against the movable blade 508, both edges are cut from both ends in exactly the same structure as scissors.

[0005] Japanese Patent Publication No. Hei 8-22517 also discloses a movable blade having a curved edge having a convex shape with respect to a fixed blade and a straight blade having a straight shape. doing.

[0006] Another conventional example described above is "Jitsuho 7-1".
1907 ”and“ Japanese Patent Publication No. 8-5030 ”also disclose a structure in which the movable blade is warped as in the above-described conventional example.

[0007]

As described above, in the prior art, either one of the fixed blade and the movable blade is formed in a convex shape, so that the cutting edge of the fixed blade and the movable blade at the portion where the sheet is cut can be formed. The sheet is to be surely cut to ensure the contact. That is, when both the fixed blade and the movable blade are flat, the surface of the flat plate generally has a slight warp or undulation, and when the flat surfaces of the two flat plates are combined, the entire surface is in close contact. Because there is no contact between the cutting edges of the sheet cutting part is not reliable, and if there is a gap between the cutting edges, the sheet can not be cut cleanly, and there is an inconvenience that uncut portions are generated or cut off So we avoided this. Further, when both the fixed blade and the movable blade are flat plates, a pressing force is applied to portions other than the contact points between the fixed blade and the movable blade to cut the sheet, and
When the fixed blade and the movable blade are brought into pressure contact with each other, the sheet material receiving the pressing force is deflected, so that the gap between the blade edges is more easily opened, and the sheet is hardly cut.

However, in the above-mentioned conventional technology,
Since either the fixed blade or the movable blade is formed in a convex shape,
If it is desired to accurately form an optimum shape, the cost of processing is high, and if it is to be formed at a low cost, it is not possible to accurately form the optimum shape. If the shape of the cutting edge is not accurately formed with the optimum shape and there is a gap between both blades, the sheet will be peeled off when cutting, and a clean cut surface will not be obtained, causing interference or excessively high pressing force Then, the driving load on the motor of the movable blade increases, and the wear of the blade increases. Furthermore, when one of the fixed blade and the movable blade is convex and the other is straight, in order to make one blade follow the other blade, it is necessary to make one blade a flexible thin plate member, Thin blades may deform when trying to cut thick sheets. In addition, one of the bending blades has a small bending amount when the contact point between the blades is close to both ends, and increases when the contact point is near the center. The cutting force tends to be too small due to too small a force, and the bending deformation load increases in the part near the center, which increases the power consumption due to the need to use a motor with a large output, and further increases the wear of the blade. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet cutter which can be cut at a low cost and can be cut cleanly without cutting off or tearing off the sheet.

[0010]

In order to achieve the above object, in a sheet cutter according to the present invention, there is provided a fixed blade having a straight blade portion formed straight in a longitudinal direction, and a straight blade portion of the fixed blade. A movable blade having a blade edge portion formed obliquely opposed to and engaged with a meshing surface and configured to be able to advance and retreat with respect to the fixed blade, and a movable blade press-contact member for pressing the movable blade against the fixed blade And a movable blade driving means for driving the movable blade forward and backward, wherein the movable blade has a protruding portion provided on the back surface of the meshing surface in proximity to the blade edge portion, and the movable blade press-contact member is the fixed blade. A pressing end portion is provided in the vicinity of the straight blade portion, and the pressing end portion presses the protruding portion, so that the meshing surface is inclined in a direction in which the tip is farther from the opposing surface of the fixed blade. Pressing the movable blade against the fixed blade The one in which the features.

[0011] Further, the projection is provided in parallel with the blade edge.

Further, the pressing end is provided in parallel with the straight blade portion.

Further, the distance between the blade tip of the movable blade and the projection is 1 to 3 mm.

Further, the width of the protruding portion of the movable blade is from 0.5 to
2 mm.

[0015] Further, the projecting portion of the movable blade is formed by projecting.

Further, the projecting portion of the movable blade is formed by half blanking.

Further, the movable blade is characterized in that the protruding portion is formed of a plastic having a low coefficient of friction and abrasion resistance.

Further, a distance between a pressing end of the movable blade pressing member and a straight blade of the fixed blade is 1 to 3 mm.

Further, the movable blade has a V-shaped cutting edge portion whose center is receded.

Further, the movable blade has a blade edge portion formed to be inclined with respect to the fixed blade from one end to the other end.

[0021]

Embodiments of the present invention will be described below with reference to the drawings based on embodiments. FIG. 1 is a plan view according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state of a cross section taken along line AA of FIG. FIG. 3 is an enlarged sectional view showing a state where a sheet is loaded in FIG. 2 in an enlarged manner. FIG.
FIG. 2 is a partial detailed view for explaining a state of a movable blade and a fixed blade in FIG. 1. FIG. 5 is a partial detailed view showing a state where the movable blade in FIG. 4 has slightly moved in the direction of the fixed blade to cut the sheet. FIG. 6 is a partial detailed view showing a state where the movable blade has moved further in the direction of the fixed blade than in FIG. 5 and the sheet has been cut by about half. FIG. 7 is a partially detailed view showing a state where the movable blade has moved further in the direction of the fixed blade than in FIG. 6 and has almost cut the sheet. FIG. 8 shows a second embodiment of the present invention.
It is a partial detailed view for explaining the state of the movable blade and the fixed blade according to the example. Next, an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, 7 and 8.

The first embodiment will be described with reference to FIGS. 1 and 2.
a, a lower sheet insertion slot 1b is provided. A motor 2 is fixed inside the housing 1, and the motor 2 is connected to a drive circuit (not shown). A worm 3 is fixed to a drive shaft of the motor 2, and a transmission gear 4 rotatably mounted on the housing 1 meshes with the worm 3, and is configured to rotate with the rotation of the motor 2. A movable blade drive gear A5 rotatably mounted on the housing 1 meshes with the transmission gear 4, and a movable blade drive gear B6 rotatably mounted on the housing 1 meshes with the movable blade drive gear A5. Both are configured to rotate with the rotation of the transmission gear 4. A movable blade drive pin A5a projects from a lower surface of the movable blade drive gear A5, and a movable blade drive pin B6a projects from a lower surface of the movable blade drive gear B6. The above is the movable blade driving means.

In FIG. 3, a fixed blade 7 having a straight blade portion 7a formed straight is fixed to the housing 1,
Fixed blade 7, movable blade drive gear A5 and movable blade drive gear B
A movable blade 8 is disposed between the movable blade 8 and the movable blade 8.
a is opposed to the fixed blade 7. As shown in FIG. 1, the movable blade 8 is provided with a drive groove A8b and a drive groove B8c, and the drive groove A8b and the drive groove B8c are provided with a movable blade drive pin A
5a and the movable blade drive pin B6a are fitted respectively, and the movable blade 8 continuously moves forward and backward with respect to the fixed blade 7 with the rotation of the movable blade drive gear A5 and the movable blade drive gear B6. Have been.

Referring to FIG. 4, the relationship between the fixed blade 7 and the movable blade 8 will be described in detail. The movable blade 8 has a movable blade guide portion 8d at both ends thereof, and the movable blade guide portion 8d contacts the fixed blade 7, and the movable blade 8 contacts the fixed blade 7 even when the movable blade 8 is retracted. The projection is formed so as not to be deviated from the state. Between the two movable blade guides 8d, the center is formed in a V-shape that is receded with respect to the fixed blade 7, that is, a cutting edge in a form in which two straight lines oblique to the straight blade 7a are combined. It has a portion 8e. The reason why the cutting edge portion 8e is inclined is that the cutting edge portion 8e of the movable blade 8 is inclined with respect to the straight blade portion 7a of the fixed blade 7, and the sheet 10 is efficiently cut by the scissors effect. .

The movable blade 8 is provided on the back of the meshing surface 8a.
A protruding portion 8f protruding by 0.1 to 0.3 mm is formed by protruding processing in parallel with the cutting edge portion 8e at a distance of 1 to 3 mm. In this embodiment, the protruding portion 8f is formed by protruding to smooth the sliding surface.
If the flatness of the movable blade 8 is emphasized, the movable blade 8 may be formed by half-blanking. Further, if the operation load is reduced or the durability is emphasized, the protrusion 8f is made of plastic having a small friction coefficient and excellent wear resistance. And may be molded. A movable blade pressure contact member 9 is sandwiched between the housing 1 and the movable blade drive gear A5 and the movable blade drive gear B6. A pressing end 9a protruding in parallel at a distance of 3 mm is formed. This interval is such that the pressing end 9a presses a position near the meshing point of the movable blade 8 with the fixed blade 7 to be described later, and the blade tip 8e of the movable blade 8 is strongly pressed against the straight blade 7a of the fixed blade 7. At the same time, it is set so that the sheet 10 can be easily loaded between the straight blade portion 7a and the pressing end portion 9a. As shown in FIG. 3, in the movable blade 8, the edge 8 e of the movable blade 8 is inclined in the far direction by the thickness of the fixed blade 7, and the end of the movable blade 8 opposite to the edge 8 e is weakened to the housing 1. We are in pressure contact.

Further, a state in which the movable blade 8 advances with respect to the fixed blade 7 to cut the sheet will be described with reference to FIGS. 5, 6, and 7. FIG. When the movable blade 8 moves forward, the blade tip 8e of the movable blade 8 starts to engage with the straight blade portion 7a of the fixed blade 7 from both ends thereof and moves toward the center, but as shown in FIG. The blade 8 slightly advances from the state shown in FIG. 4 in the direction of the fixed blade 7, and the right mesh point SP1R
When the cutting edge 8e of the movable blade 8 is engaged with the straight blade 7a of the fixed blade 7 at the left engagement point SP1L, the protrusion 8f of the movable blade 8 includes the right pressure contact PP1R and the left pressure contact P
At P1L, the movable blade press member 9 is pressed against the pressing end 9a. Thus, the right engagement point SP1 at which the cutting edge 8e of the movable blade 8 and the straight blade 7a of the fixed blade 7 are engaged.
The distance D between R and the right pressure contact PP1R where the movable blade 8 is pressed in the direction of the fixed blade 7 is very close, and the distance between the left meshing point SP1L and the left pressure contact PP1L is the same. It is. Therefore, the pressing force of the movable blade pressing member 9 is almost applied to the right pressure contact PP1R and the left pressure contact PP1L.

As described above, the pressing force of the movable blade pressing member 9 is almost applied to the right pressure contact PP1R and the left pressure contact PP1L, and as shown in FIG. Since it is inclined with respect to 7 and is in contact with the straight blade portion 7a, the blade edge portion 8e can be pressed against the straight blade portion 7a with a large force at the right meshing point SP1R and the left meshing point SP1L.

Next, as shown in FIG. 6, when the movable blade 8 further advances in the direction of the fixed blade 7 from the state shown in FIG. 5, the right mesh point SP1R and the left mesh point SP1L shown in FIG. Each of them moves toward the center, and the blade edge 8e of the movable blade 8 and the straight blade 7a of the fixed blade 7 mesh at the right mesh point SP2R and the left mesh point SP2L. At this time, the movable blade 8
Of the right pressure contact PP2R and the left pressure contact PP2L
At the pressing end 9a of the movable blade pressing member 9. Therefore, the right meshing point SP2R and the left meshing point SP2L where the cutting edge 8e of the movable blade 8 and the straight blade 7a of the fixed blade 7 mesh, and the right pressure contact where the movable blade 8 is pressed in the direction of the fixed blade 7 The distance D between the point PP2R and the left pressure contact PP2L is very close to each other as in the state of FIG. 5 described above, and the pressing force of the movable blade pressure contact member 9 is almost the same as the right pressure contact PP2R and the left pressure contact. It depends on PP2L. At the same time, as shown in FIG. 3, the movable blade 8 is inclined with respect to the fixed blade 7 and is in contact with the straight blade portion 7a.
At the right engagement point SP2R and the left engagement point SP2L, it is possible to perform pressure contact with a large force.

Next, as shown in FIG. 7, when the movable blade 8 further advances in the direction of the fixed blade 7 from the state shown in FIG. 6, the right mesh point SP2R and the left mesh point SP2L shown in FIG. Each of them moves further toward the center, and the cutting edge 8e of the movable blade 8 and the straight blade 7a of the fixed blade 7 form a right mesh point SP3R.
At the left meshing point SP3L. At this time, the protruding portion 8f of the movable blade 8 is pressed by the pressing end 9a of the movable blade pressing member 9 at the central pressure contact PP3. Therefore,
Right meshing point SP3R and left meshing point SP3L where blade edge portion 8e of movable blade 8 and straight blade portion 7a of fixed blade 7 mesh.
The distance D between the right pressure contact PP3R and the left pressure contact PP3L where the movable blade 8 is pressed in the direction of the fixed blade 7 is very close to each other as in the state of FIG. The pressing force of the blade pressure contact member 9 is almost the right pressure contact P
P3R and the left pressure contact PP3L. At the same time, as shown in FIG. 3, the movable blade 8 is inclined with respect to the fixed blade 7 and is in contact with the straight blade portion 7a.
The contact can be made with a large force at R and the left meshing point SP3L.

Therefore, while the movable blade 8 moves from the most retracted position to the most advanced position with respect to the fixed blade 7, the tip of the blade edge 8e always moves while being in pressure contact with the straight blade portion 7a of the fixed blade 7. Therefore, the sheet 10 can be cut with a clean cutting surface with a light moving load.

Next, a second embodiment will be described with reference to FIG. The movable blade 108 has a movable blade guide 10 at one end thereof.
The movable blade guide portion 108d is in contact with the fixed blade 7, and is formed so as to protrude so that the movable blade 108 does not come off from the contact state even when the movable blade 108 is retracted.
Further, the movable blade 1 is moved from the root of the movable blade guide 108d.
08, the cutting edge 108c is formed obliquely rectilinearly with respect to the fixed blade 7 toward the other end. Movable blade 10
8 has a blade tip 10 in the same manner as in the first embodiment.
A protruding portion 108f that is 0.5 to 2 mm wide and protrudes 0.1 to 0.3 mm is formed in parallel at a distance of 1 to 3 mm from 8e. Further, in the same manner as in the first embodiment described above,
The movable blade press-contact member 9 includes one from the straight blade portion 7 a of the fixed blade 7.
A pressing end 9a protruding in parallel at a distance of about 3 mm is formed. The pressing end 109a is the protruding portion 10 of the movable blade 108.
8f, the blade edge portion 108e of the movable blade 108 is strongly pressed against the straight blade portion 7a of the fixed blade 7.

Here, as described above, the meshing point SP,
Since the pressure contact PP is very close to the pressure contact PP, the pressing force of the movable blade pressure contact member 109 is almost applied to the pressure contact PP, and at the same time, as shown in FIG. Since it is oblique to the straight blade portion 7a and is in contact with the straight blade portion 7a, it can be pressed with a large force at the meshing point SP.

Therefore, in the same manner as in the first embodiment described above, while the movable blade 108 moves from the most retracted position to the most advanced position with respect to the fixed blade 7, the blade edge portion 108e
Of the stationary blade 7 always moves while being pressed against the straight blade portion 7a of the fixed blade 7, so that the sheet 10 can be cut with a clean cutting surface with a light moving load.

In the second embodiment, since the movable blade 108 has a cutting edge portion 108e which is formed to be inclined with respect to the fixed blade 7 from one end to the other end, the movable blade 108 is moved halfway through the entire stroke. The sheet 10 can be cut forward from only one side by moving it forward and retreating from it, and the cut amount can be changed by adjusting the amount of advance.

[0035]

According to the present invention, the fixed blade has a fixed blade having a straight blade portion formed straight in the longitudinal direction, and a blade edge portion formed diagonally opposite to the straight blade portion of the fixed blade so as to mesh with the straight blade portion. A movable blade configured to be able to advance and retreat with respect to the blade, a movable blade pressing member that presses the movable blade against the fixed blade,
In a sheet cutter comprising movable blade driving means for driving the movable blade forward and backward, the movable blade has a protruding portion provided on the back surface of the meshing surface in proximity to the blade edge portion, and the movable blade press-contact member is configured to straighten the fixed blade. The movable end is provided in a state in which the engaging end is inclined in a direction away from the opposing surface of the fixed blade by providing a pressing end portion close to the blade portion, and the pressing end portion presses the protruding portion. Since the blade is configured to be in pressure contact with the fixed blade, the movable blade is pressed in the direction of the fixed blade at a position very close to the point of engagement between the blade edge of the movable blade and the straight blade portion of the fixed blade, and The largest mutual pressing force is applied to the meshing point between the blade tip and the straight blade of the fixed blade. Thereby, the blade tip can be pressed against the straight blade with a large force at the meshing point, and the sheet can be cut with a clean cut surface without peeling or cutting failure.

Further, since the projecting portion is provided in parallel with the blade edge portion and the pressing end portion is provided in parallel with the straight blade portion, regardless of the moving position of the movable blade,
The movable blade can be pressed in the direction of the fixed blade at a position very close to the point of engagement between the blade edge of the movable blade and the straight blade portion of the fixed blade. .

Further, since the distance between the blade tip of the movable blade and the projection is 1 to 3 mm, the processing of the projection on the movable blade is facilitated, and the blade tip of the movable blade and the straight blade of the fixed blade are formed. A large mutual pressing force can always be applied to the meshing point with.

Further, the width of the protruding portion of the movable blade is 0.5 to
Since it is 2 mm, the processing of the protruding portion on the movable blade is facilitated, and the pressing end of the movable blade press-contact member always connects the protruding portion with the meshing point between the blade tip of the movable blade and the straight blade portion of the fixed blade. Can be pressed at a position very close to.

Further, since the protruding portion of the movable blade is formed by protruding, the sliding surface of the movable blade pressing member with the pressing end can be formed smoothly.

Further, since the protruding portion of the movable blade is formed by half blanking, it can be formed with a small force, so that the flatness of the movable blade does not decrease.

Further, since the protruding portion of the movable blade is formed of plastic having a low coefficient of friction and abrasion resistance, a motor having a small load on the cutting operation of the movable blade and a small output can be used. Both blades can provide a sheet cutter with little wear and excellent durability.

Since the distance between the pressing end of the movable blade pressing member and the straight blade of the fixed blade is 1 to 3 mm,
The pressing end of the movable blade press-contact member can always press the protruding portion at a position very close to the point of engagement between the blade tip of the movable blade and the straight blade of the fixed blade. The sheet can be easily inserted by ensuring a sufficient space with the sheet.

Further, since the movable blade has a V-shaped cutting edge portion whose center is receded, the sheet can be cut with a small driving force.

Further, since the movable blade has a cutting edge portion which is formed obliquely with respect to the fixed blade from one end to the other end, a cut can be made from only one side of the sheet. The amount can also be adjusted.

[Brief description of the drawings]

FIG. 1 is a plan view according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state of a section taken along line AA of FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a state where a sheet is loaded in FIG. 2;

FIG. 4 is a partial detailed view for explaining a state of a movable blade and a fixed blade in FIG. 1;

FIG. 5 is a partial detailed view showing a state where the movable blade in FIG. 4 has slightly moved in the direction of the fixed blade to cut a sheet.

FIG. 6 moves the movable blade further toward the fixed blade than in FIG. 5,
FIG. 5 is a partial detailed view showing a state where a sheet is cut by about half.

FIG. 7: the movable blade moves further in the direction of the fixed blade than in FIG. 6,
FIG. 3 is a partial detailed view showing a state where a sheet is almost cut.

FIG. 8 is a partial detailed view illustrating a state of a movable blade and a fixed blade according to a second embodiment of the present invention.

FIG. 9 is a perspective view of a conventional sheet cutter.

10 is a detailed view showing the state of the movable blade cut at the upper surface of the fixed blade and the position of the upper surface of the fixed blade in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Upper sheet insertion opening 1b Lower sheet insertion opening 501c Sheet passage opening 2 Motor 3 Worm 4 Transmission gear 5 Movable blade drive gear A 5a Movable blade drive pin A 6 Movable blade drive gear B 6a Movable blade drive pin B 7,507 Fixed blade 7a Straight blade portion 507b Fixed blade tip portion 507c Support shaft 8, 108, 508 Movable blade 8a Mesh surface 8b Drive groove A 8c Drive groove B 8d, 108d Movable blade guide portion 8e, 108e, 508e Blade tip portion 8f, 108f Projection Part 9, 109 Movable blade pressing member 9a, 109a Pressing end part 10 Sheet 511 Frame 512 Pressing member

Claims (11)

[Claims] A fixed blade having a straight blade portion formed in a straight shape in a longitudinal direction, and a blade edge portion formed diagonally opposite to the straight blade portion of the fixed blade so as to mesh with the straight blade portion. A movable blade configured to be able to advance and retreat with respect to the blade, a movable blade pressing member that presses the movable blade against the fixed blade,
In a sheet cutter comprising movable blade driving means for driving the movable blade forward and backward, the movable blade has a protruding portion provided on the back surface of the meshing surface in proximity to the blade edge portion, and the movable blade press-contact member is configured to straighten the fixed blade. The movable end is provided in a state in which the engaging end is inclined in a direction away from the opposing surface of the fixed blade by providing a pressing end portion close to the blade portion, and the pressing end portion presses the protruding portion. A sheet cutter characterized in that a blade is pressed against said fixed blade. 2. The sheet cutter according to claim 1, wherein the projecting portion is provided in parallel with the blade edge portion. 3. The sheet cutter according to claim 1, wherein the pressing end portion is provided in parallel with the straight blade portion. 4. The sheet cutter according to claim 1, wherein the distance between the blade tip of the movable blade and the protruding portion is 1 to 3 mm. 5. The width of the protruding portion of the movable blade is 0.5 to 2 m.
The sheet cutter according to claim 1, wherein m is m. 6. The sheet cutter according to claim 1, wherein the protrusion of the movable blade is formed by protrusion. 7. The sheet cutter according to claim 1, wherein the protrusion of the movable blade is formed by half blanking. 8. The sheet cutter according to claim 1, wherein the protruding portion of the movable blade is formed of plastic having a low coefficient of friction and abrasion resistance. 9. The sheet cutter according to claim 1, wherein a distance between a pressing end of the movable blade pressing member and a straight blade of the fixed blade is 1 to 3 mm. 10. The sheet cutter according to claim 1, wherein the movable blade has a cutting edge portion formed in a V-shape with its center retreated. 11. The sheet cutter according to claim 1, wherein the movable blade has a blade edge portion formed to be inclined with respect to the fixed blade from one end to the other end.