JPH1158292A - Sheet cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To neatly cut a sheet without entailing any uncut part and torn-pieces by protruding an edge part of a movable cutting blade in the direction of a stationary blade from the opposed surface. SOLUTION: When a movable cutting blade driving gear is rotated, a movable cutting blade 8 advances toward a stationary blade 7. Likewise, when a cutting edge part 8e arrives at a straight blade part 7a, it is bent in the direction of an opposed surface 8a. The cutting edge aprt 8e projecting as far as a projected variable S pinches a sheet 11 of printing paper being charged and cuts it in engagement with the stationary blade 7. The projected variable is recommended to be a range from 0.05 mm to 0.3 mm. Since the cutting edge part 8e is projected over as far as the projected variable S, even in the oase where one side curvature of a surface where the stationary blade 7 and the movable cutting blade 8 cane into contact with each other is too larger, there is no spot of engagement between the straight blade part 7a of the stationary blade 7 and the cutting edge part 8e of the movable cutting blade 8, and thus the sheet is cut in a neat cutting manner.

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 for cutting a sheet using a fixed blade and a movable blade, there is provided a fixed blade having a straight blade portion formed flat and a straight blade facing the straight blade portion. A movable blade having a flat facing surface, a blade edge portion formed at one end of the facing surface, and a protruding portion at a position close to the blade edge portion on the back surface of the facing surface, and a straight blade portion of the fixed blade. A movable blade press-contact member having a pressing end portion in close proximity to the movable blade, and an opposing surface of the movable blade abuts on the fixed blade in a state where the tip is inclined in a direction away from the fixed blade, and the pressing end portion is the projecting portion. By pressing the movable blade, the movable blade is slid while pressing the movable blade against the fixed blade, thereby cutting a sheet between the fixed blade and the movable blade.

[0003] Next, FIGS.
This will be described with reference to FIGS. 8, 9, and 10. FIG. 5 is a plan view of a conventional sheet cutter. FIG. 6 is a cross-sectional view showing a cross section taken along line CC in FIG. FIG. 7 is an enlarged detail view of the D portion in FIG. 6. FIG. 8 is an explanatory diagram showing a state of the fixed blade, the movable blade, and the movable blade pressing member in FIG. FIG. 9 is an explanatory diagram showing a state where the movable blade in FIG. 8 has slightly moved in the direction of the fixed blade to cut the sheet. FIG. 10 is an explanatory view showing a state in which the movable blade has moved further in the direction of the fixed blade than in FIG. 9 and has almost cut the sheet.

Referring to FIGS. 5 and 6, a housing 10 is shown.
1 has an upper sheet insertion slot 101a and a lower sheet insertion slot 101
b is provided. Further, a motor 102 is fixed inside the housing 101, and the motor 102 is connected to a drive circuit (not shown). A worm 103 is fixed to a drive shaft of the motor 102, and a transmission gear 104 rotatably attached to the housing 101 meshes with the worm 103, and is configured to rotate as the motor 102 rotates. A movable blade drive gear A105 rotatably mounted on the housing 101 meshes with the transmission gear 104, and further, a movable blade drive gear A10
A movable blade driving gear B 106 rotatably attached to the housing 101 meshes with the housing 5, and both are configured to rotate with the rotation of the transmission gear 104. A movable blade drive pin A105a projects from a lower surface of the movable blade drive gear A105, and a movable blade drive pin B106a projects from a lower surface of the movable blade drive gear B106. The above is the movable blade driving means.

As shown in FIG. 5, the movable blade 108 is provided with a driving groove A108b and a driving groove B108c, and the driving groove A108b and the driving groove B108c are provided with a movable blade driving pin A105a and a movable blade driving pin B106a, respectively. The movable blade drive gear A105 and the movable blade drive gear B106 are fitted.
The movable blade 108 continuously rotates with the fixed blade 107
Are configured to perform forward and backward movements.

In FIG. 7, a fixed blade 107 having a straight blade portion 107a formed in a straight shape is provided on a housing 101.
The movable blade 108 is disposed between the fixed blade 107 and the movable blade drive gear A105 and the movable blade drive gear B106, and the movable blade 108 faces the fixed blade 107 with a facing surface 108a. A protruding portion 108f is formed on the rear surface of the opposing surface 108a of the movable blade 108 by a protruding process, a half-blanking process, or the like.

[0007] Housing 101 and movable blade drive gear A10
5 and the movable blade drive gear B106, a movable blade pressure contact member 109 is sandwiched, and the distal end of the movable blade pressure contact member 109 has a pressing end protruding in parallel with the straight blade portion 107a of the fixed blade 107 slightly apart. 109a are formed. This interval is determined by pressing the position where the pressing end 109a is close to the point at which the movable blade 108 meshes with the fixed blade 107 described later.
08 with the straight blade portion 107 of the fixed blade 107
It is set so as to strongly press against a.

[0008] Pressing end 109a of movable blade press-contact member 109
A sliding member 110 is disposed between the movable blade 108 and the movable blade 108, and the sliding member 110 is pressed from above by a pressing end 109a and pressed against the protrusion 108f.
The sliding member 110 has projections 110a formed at both ends so as not to be moved and moved by the movable blade 108, and the projections 110a are engaged with recesses formed in the housing 101. Further, the sliding member 110
Has a bent portion 110b bent along a pressing end portion 109a pressed from above, and the bent portion 110b holds the pressing end portion 109a from outside and locks the pressing end portion 109a so as not to move. ing.

Referring to FIG. 8, the fixed blade 107 and the movable blade 10
8 will be described in detail. Movable blade 108
Has movable blade guides 108d at both ends thereof. The movable blade guides 108d abut against the fixed blade 107,
Is movable, the movable blade 108 is fixed.
7 is formed so as to protrude so as not to be deviated from the state of contact with 7. Between the two movable blade guides 108d, a cutting edge having a V-shape with a central portion receding with respect to the fixed blade 107, that is, a combination of two straight lines oblique to the straight blade 107a. It has a portion 108e.

The movable blade 108 is formed with a protrusion 108f on the back surface of the facing surface 108a by a protruding process, a half blanking process, etc., slightly separated from the blade edge portion 108e. As shown in FIG.
7, the facing surface 108a is fixed to the straight blade portion 107a of the fixed blade 107 in a state where the blade edge portion 108e is inclined in the far direction by a thickness of 7.
Is in contact with Further, the movable blade 108 has a protruding portion 108f formed by the pressing end portion 109a of the movable blade pressing member 109.
Is pressed by the straight blade portion 107a of the fixed blade 107 via a sliding member 110 provided on the upper surface of the fixed blade 107. Therefore,
The movable blade 108 and the other surface of the fixed blade 107 abut against each other, so that the engagement between the blade edge 108e of the movable blade 108 and the straight blade portion 107a of the fixed blade 107 is not hindered. 107a are engaged with each other, and the sheet 111 can be cut.

Further, referring to FIGS. 9 and 10, the movable blade 108 moves forward with respect to the fixed blade 107 to
Will be described. When the movable blade 108 moves forward, the blade tip 108e of the movable blade 108
Starts to engage with the straight blade portion 107a of the fixed blade 107 from both ends thereof, and moves toward the center. As shown in FIG. 9, the movable blade 108 moves from the state of FIG.
In the state where the blade edge 108e of the movable blade 108 is engaged with the straight blade 107a of the fixed blade 107 at the right engagement point SP1R and the left engagement point SP1L, the protrusion 108f of the movable blade 108 Is the right pressure contact P
The movable blade pressure contact member 10 at the P1R and the left pressure contact PP1L
9 is pressed by the pressing end 109a. in this way,
The distance D between the right engagement point SP1R where the blade edge portion 108e of the movable blade 108 and the straight blade portion 107a of the fixed blade 107 mesh with each other and the right pressure contact PP1R where the movable blade 108 is pressed in the direction of the fixed blade 107 are: They are very close, and the distance between the left meshing point SP1L and the left pressure contact point PP1L is the same. Therefore, the pressing force of the movable blade pressing member 109 is
Mostly, it is 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 109 is almost equal to the right pressure contact PP1R and the left pressure contact PP1.
3, the movable blade 108 is inclined with respect to the fixed blade 107 and is in contact with the straight blade portion 107a, so that the blade edge portion 108e is connected to the straight blade portion 107a as shown in FIG. The right mesh point SP1R and the left mesh point SP
It is possible to press with a large force in 1L.

Next, as shown in FIG. 10, when the movable blade 108 further advances in the direction of the fixed blade 107 from the state shown in FIG. 9, the right mesh point SP1R and the left mesh point SP1 shown in FIG.
1L respectively move toward the center, and the fixed blade 10
7 straight blade portion 107a and movable blade 108 with a blade edge portion 108e.
Is meshed at the right mesh point SP2R and the left mesh point SP2L. At this time, the protruding portion 1 of the movable blade 108 shown in FIG.
08f is pressed by the pressing end 109a of the movable blade pressing member 109. The right pressure contact PP1R and the left pressure contact PP1L are
Each moves toward the center, and the center pressure contact PP2
At the pressing end 109a of the movable blade pressing member 109. Accordingly, the right mesh point SP2R and the left mesh point SP2L where the straight blade portion 107a of the fixed blade 107 and the blade edge portion 108e of the movable blade 108 mesh with each other, and the movable blade 108
9 are very close to each other, as in the state of FIG. 9 described above, and the pressing force of the movable blade pressing member 109 is almost right-engaged. It depends on the point SP2R and the left meshing point SP2L. At the same time, as shown in FIG. 3, since the movable blade 108 is inclined with respect to the fixed blade 107 and abuts on the straight blade portion 107a, the right meshing point SP2R and the left meshing point SP
2L can be pressed with a large force.

Therefore, while the movable blade 108 moves from the most retracted position to the most advanced position with respect to the fixed blade 107, the pressing end 109a of the movable blade press-contact member 109 is always close to the cutting edge 108e of the movable blade 108. Movable blade 10 in position
8 is pressed against the fixed blade 107, so that the blade edge portion 108e
Of the stationary blade 107 is constantly moved while being pressed against the straight blade portion 107a of the fixed blade 107, so that the sheet 111 can be cut with a clean cutting surface under a light moving load.

However, the fixed blade 107 and the movable blade 108
The surfaces of the fixed blade 107 and the movable blade 108 that are in contact with each other are flat. If at least one of the surfaces of the fixed blade 107 and the movable blade 108 that are in contact with each other is too large, the straight blade 107a of the fixed blade 107 and the movable blade 108 May not be engaged with the cutting edge portion 108e of the blade.

[0016]

As described above, in the related art, since the surfaces of the fixed blade and the movable blade that contact each other are flat, at least one of the surfaces of the fixed blade and the movable blade that contact each other is used. If the warpage is too large,
In some cases, the straight blade portion of the fixed blade and the blade edge portion of the movable blade do not mesh with each other, and as a result, the sheet cannot be cut cleanly, and there is an inconvenience that the sheet is left uncut or cut off.

An object of the present invention is to provide a sheet cutter which is inexpensive and can be cut neatly without cutting off or tearing off the sheet when cutting the sheet.

[0018]

In order to achieve the above object, in a sheet cutter according to the present invention, a fixed blade having a straight blade formed straight in a longitudinal direction and a straight blade of the fixed blade are provided. A fixed cutting edge having a cutting edge formed obliquely with respect to the straight cutting edge so as to mesh with the cutting edge, an opposing surface facing the straight cutting edge, and a protruding portion formed on the back surface of the opposing surface in proximity to the cutting edge; The movable blade is configured to be able to advance and retreat with respect to the straight blade, and the movable blade is pressed against the fixed blade by pressing the protrusion at a position close to the straight blade and formed near the straight blade. In a sheet cutter comprising a movable blade pressing member having a pressing end portion to be pressed and a movable blade driving means for driving the movable blade forward and backward, a blade edge portion of the movable blade protrudes from the facing surface toward the fixed blade. It is characterized by the following.

The bending position of the cutting edge of the movable blade is
It is characterized by being substantially parallel to the cutting edge.

Further, the amount of protrusion of the tip of the blade tip of the movable blade from the opposing surface of the movable blade is 0.05 mm to 0.3 mm.

Further, the movable blade has a protruding portion provided in parallel with the blade edge 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 set to 0.
5 to 2 mm.

Further, the height of the protruding portion of the movable blade is set at 0.
0.5 to 0.5 mm.

Further, the pressing end of the movable blade pressing member is
The fixed blade is provided in parallel with the straight blade portion.

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.

[0027]

Embodiments of the present invention will be described below with reference to the drawings based on embodiments. FIG. 1 is an enlarged sectional view showing a portion similar to FIG. 7 of a conventional example according to one embodiment of the present invention. FIG. 2 is an enlarged sectional view showing the part A in FIG. 1 in a further enlarged manner. FIG. 3 is an enlarged sectional view showing a state in which the movable blade in FIG. 1 has advanced in the direction of the fixed blade and cut the sheet. FIG. 4 is an enlarged sectional view showing a portion B in FIG. 3 in a further enlarged manner. Next, an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4 only for parts different from the above-described conventional example.

1 and 2, a fixed blade 7 having a straight blade portion 7a formed in a straight shape is fixed to the housing 1, and the fixed blade 7 is connected to a movable blade drive gear A5 and a movable blade drive gear B6. A movable blade 8 is disposed between the movable blades 8.
Faces the fixed blade 7 with the facing surface 8a. Also,
When viewed from above, the movable blade 8 has a V-shaped central portion receding with respect to the fixed blade 7, that is, a blade edge portion 8e in which two straight lines oblique to the straight blade portion 7a are combined. The cutting edge 8e is bent in the direction of the facing surface 8a substantially parallel to the planar shape of the tip, and projects from the facing surface 8a by the projection amount S. The amount of protrusion S is 0.05 mm to 0.5 mm.
3 mm is appropriate. The pressing end 109a formed at the tip of the movable blade pressing member 109 is a straight blade 107.
It is desirable to set at a position 1 to 3 mm apart from a. The position of the pressing end 109a formed at the tip of the movable blade pressing member 109 is the straight blade 1 of the fixed blade 107.
The position of the movable blade 1 to 3 mm is preferable.
08 is formed with a cutting edge 108e.
From 1 to 3mm apart, width from 0.5mm to 2mm
It is desirable that the height is formed from 0.05 mm to 0.5 mm.

Further, a state in which the movable blade 8 moves forward with respect to the fixed blade 7 to cut the sheet 11 will be described with reference to FIGS. When the movable blade drive gear A5 and the movable blade drive gear B6 rotate from the state shown in FIG. 1, the movable blade 8 advances toward the fixed blade 7, and when the blade edge 8e reaches the straight blade portion 7a, the movable blade 8 faces the movable blade 8. Projection amount S bent in the direction of surface 8a
The blade edge portion 8e that protrudes only engages with the fixed blade 7 and cuts the sheet 11 with the sheet 11 of printing paper or the like loaded therebetween. Since the cutting edge portion 8e of the movable blade 8 protrudes from the facing surface 8a by the amount of protrusion S, at least one of the surfaces of the fixed blade 7 and the movable blade 8 that come into contact with each other is large as in the above-described conventional example. Even if it is too long, there is no place where the straight blade portion 7a of the fixed blade 7 and the blade edge portion 8e of the movable blade 8 do not mesh with each other, and the sheet is cut with a clean cut surface without scuffing or poor cutting. Can be.

[0030]

As described above, according to the present invention,
The fixed blade has a blade edge portion formed so as to mesh with the straight blade portion, a facing surface facing the straight blade portion, and a protrusion formed on the back surface of the facing surface in proximity to the blade portion. A movable blade configured to be able to advance and retreat freely, and pressing the protruding portion at a position substantially parallel to the straight blade portion and at a position close to the straight blade portion to press the movable blade against the fixed blade. In a sheet cutter comprising a movable blade pressing member having a pressing end portion and a movable blade driving means for driving the movable blade forward and backward, the movable blade is formed by projecting a blade edge portion of the movable blade from the facing surface toward the fixed blade. While the blade moves from the most retracted position to the most advanced position with respect to the fixed blade, the pressing end of the movable blade pressing member always presses the movable blade against the fixed blade at a position close to the blade edge of the movable blade. The tip of the part
It always moves while pressing the straight blade of the fixed blade. Also,
Even if the warpage of at least one of the surfaces of the fixed blade and the movable blade that are in contact with each other is too large, there is no place where the straight blade portion of the fixed blade and the blade edge portion of the movable blade do not engage, and The sheet can be cut with a clean cut surface without any cutting defects.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a portion similar to FIG. 7 of a conventional example according to one embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a part A in FIG. 1 in a further enlarged manner.

FIG. 3 is an enlarged sectional view showing a state in which a movable blade in FIG. 1 has advanced in a direction of a fixed blade and cut a sheet.

FIG. 4 is an enlarged sectional view showing a portion B in FIG. 3 in a further enlarged manner.

FIG. 5 is a plan view of a sheet cutter in a conventional example.

FIG. 6 is a sectional view showing a state of a section taken along line CC in FIG. 5;

FIG. 7 is an enlarged view of a D part in FIG. 6;

FIG. 8 is an explanatory view showing a state of a fixed blade, a movable blade, and a movable blade pressing member in FIG. 5;

FIG. 9 is an explanatory view showing a state in which the movable blade in FIG. 8 has slightly moved in the direction of the fixed blade to cut a sheet.

FIG. 10 is an explanatory view showing a state where the movable blade has moved further in the direction of the fixed blade than in FIG. 9 and has almost cut the sheet;

[Explanation of symbols]

 1, 101 Housing 1a, 101a Upper sheet insertion port 1b, 101b Lower sheet insertion port 2, 102 Motor 3, 103 Worm 4, 104 Transmission gear 5, 105 Movable blade drive gear A 5a, 105a Movable blade drive pin A 6, 106 Movable blade drive gear B 6a, 106a Movable blade drive pin B 7, 107 Fixed blade 7a, 107a Straight blade 8, 108 Movable blade 8a, 108a Opposing surface 8b, 108b Driving groove A 8c, 108c Driving groove B 8d, 108d Movable Blade guide part 8e, 108e Blade tip part 8f, 108f Projection part 9, 109 Movable blade pressure contact member 9a, 109a Pressing end part 10, 110 Sliding member 10a, 110a Projection part 10b, 110b Bent part 11, 111 Sheet

Claims (9)

[Claims] 1. A fixed blade having a straight blade portion formed straight in a longitudinal direction, a blade edge portion formed obliquely with respect to the straight blade portion so as to mesh with the straight blade portion of the fixed blade, and the straight blade. A movable blade configured to have an opposing surface opposing the portion and a protruding portion formed on the back surface of the opposing surface close to the blade edge portion and configured to be able to advance and retreat with respect to the fixed blade, substantially parallel to the straight blade portion A movable blade pressing member having a pressing end for pressing the movable blade against the fixed blade by pressing the protruding portion at a position close to the straight blade portion, and driving the movable blade forward and backward. A sheet cutter comprising movable blade driving means, wherein a blade edge of the movable blade protrudes from the facing surface toward the fixed blade. 2. The blade according to claim 1, wherein the bending position of the cutting edge of the movable blade is substantially parallel to the cutting edge.
The described sheet cutter. 3. The amount by which the tip of the blade tip of the movable blade projects from the opposing surface of the movable blade is from 0.05 mm to 0.3 mm.
2. The sheet cutter according to claim 1, wherein 4. The sheet cutter according to claim 1, wherein a protruding portion of the movable blade is provided in parallel with the blade edge portion. 5. 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. 6. The width of the protruding portion of the movable blade is 0.5 to 2
2. The sheet cutter according to claim 1, wherein 7. The height of the protrusion of the movable blade is 0.05.
The sheet cutter according to claim 1, wherein the thickness is 0.5 mm. 8. The sheet cutter according to claim 1, wherein a pressing end of the movable blade pressing member is provided in parallel with a straight blade of the fixed blade. 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.