JPH0899289A - Paper sheet cutting device - Google Patents

Abstract

PURPOSE: To previously prevent generation of double cutting and a jam between a fixed blade and a movable blade of a paper sheet due to invasion of a cut paper sheet between the fixed blade and the movable blade. CONSTITUTION: In a position within an area serving as a movable area of a movable blade 10 on the surface of a paper discharge side in a fixed blade 4, a stepped part 21 bending in the direction opposite to the paper discharging direction from the surface 6 of the fixed blade 4 is formed along a blade edge 8 of the fixed blade 4. In this way, when a cut paper sheet 2 is pushed out to the position beyond the stepped part 21 from the blade edge 8 of the fixed blade 4 by means of the movable blade 10 in cutting of the paper sheet and the cut paper sheet 2 is returned to the fixed blade 4 side because of its self- weight or traveling resistance in a paper discharging process, the end edge on the fixed blade 4 side of the paper sheet 2 is kept supported by means of the stepped part 21 of the fixed blade 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet cutting device used in, for example, a receipt printer.

[0002]

2. Description of the Related Art For example, as one type of a paper sheet cutting apparatus incorporated in a printer for printing using roll paper such as a receipt printer, a movable blade is slid with respect to a fixed blade so that both blade edges are slid. There is a scissor-type paper sheet cutting device that cuts the roll paper. Hereinafter, an example of the related art is shown in FIG. 1 is the main body of the receipt printer (not shown)
It is a cutter base that is attached to the
An elongated sheet discharge port 3 through which the sheet passes is formed.

Further, on one surface of the cutter base 1,
Both ends of the fixed blade 4 along one side of the paper discharge port 3 are fixed by rivets 5. A blade edge 8 is formed at a portion where a surface 6 of the fixed blade 4 on the paper discharge side (receipt discharge side) and a surface 7 on the paper discharge port 3 side intersect. Furthermore, cutter base 1
A base of a movable blade 10 and a leaf spring 11 is rotatably held by a support shaft 9 standing upright. This leaf spring 11 presses the movable blade 10 against the surface 6 of the fixed blade 4, and the leaf spring 11 moves downward so that the tip of the leaf spring 11 fits into a square hole 12 formed in the movable blade 10 so as to always rotate together with the movable blade 10. It has been folded into. Further, as shown in FIG. 6, at a portion where one surface 12 of the movable blade 10 sliding on the surface 6 of the fixed blade 4 and the front surface 13 on the side of the sheet discharge port 3 intersect, a blade edge 14 slightly curved in an arc shape. Are formed.

A cutter arm 15 is rotatably held about a support shaft 16. The cutter arm 15 has a protrusion 18 fitted in a notch 17 formed at the end of the movable blade 10. The movable blade 10 is rotated by having the support shaft 16 as a center.

Here, the receipt 2 printed by the printing unit of the receipt printer is ejected from the ejection port 3, and the movable blade 10 is driven by the cutter arm 15 to cut the receipt 2.

[0006]

FIG. 6A shows a state immediately after the movable blade 10 rotates in the direction of arrow A to cut the receipt 2, and the cut receipt 2 is the movable blade 1.
By 0, it is pressed to a position retracted from the blade edge 8 of the fixed blade 4. As shown in FIG. 6B, when the movable blade 10 returns in the direction of the arrow B, the cut receipt 2 returns to the side of the sheet discharge port 3 due to the influence of the strength of the waist and the restoring force due to the curl, It may fall toward the paper ejection port 3 due to its own weight. As a result, there is a problem that the receipt 2 to be issued is cut again together with the receipt 2 to be issued next, or a jam occurs when the next receipt 2 is discharged.

FIG. 6 shows the case in which the receipt 2 is discharged upward, but in the case where the receipt 2 is discharged in the lateral direction, that is, in the case where the figure is tilted by 90 °, it is discharged from the paper discharge port 3. The receipt 2 has its tip pointed downward due to its own weight,
The contact with the surface of the main body of the receipt printer may cause resistance, and the leading end may stop and the middle may curve upward. In this case, when the movable blade 10 cuts the receipt 2 and returns in the direction of the arrow B, the edge on the cutting side of the receipt 2 to be issued is disengaged from the fixed blade 4 and lowered due to its own weight, and from the curved posture, the user's waist The edge on the cutting side may enter the sheet discharge port 3 when returning to a straight posture due to the strength of. Therefore, even when the receipt 2 is discharged in the lateral direction, the double-cutting and the jam may occur as described above.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a fixed blade is provided on one side of a sheet discharge port formed at an end of a sheet conveying path, and the fixed blade slides along the sheet discharge side surface. A step in which a movable blade that is held freely is provided, and the surface of the fixed blade is bent in a direction opposite to the paper discharge direction at a position within the movable range of the movable blade on the paper discharge side surface. It is a paper sheet cutting device in which a portion is formed along the edge of the fixed blade.

[0009]

According to the present invention, when a paper sheet is cut, the cut paper sheet is moved by the movable blade from the blade edge of the fixed blade to the position beyond the step portion and pushed out. When returning to the fixed blade side due to running resistance in the process, it is possible to maintain the fixed edge side edge of the sheet supported by the step portion of the fixed blade.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The parts having the same structure as the parts described in FIG. 5 and FIG.
That is, on the surface 6 of the fixed blade 4 on the discharge side of the receipt 2, the bank portion 19 along the blade edge 8 of the fixed blade 4 and the bank portion 19 are formed.
A recessed portion 20 is formed on the side opposite to the receipt discharge side, and a step portion 21 is formed at the boundary between the bank portion 19 and the recessed portion 20.

Next, the drive structure of the cutter arm 15 is shown in FIG. A cutter cam 22 for driving the cutter arm 15 has a clutch shaft 23 connected to a motor (not shown) via a clutch (not shown) with an axis parallel to the support shaft 16 of the cutter arm 15, and the clutch shaft 23. It is composed of a fan-shaped projecting piece 24 protruding from the outer periphery of the shaft 23. The cutter arm 15 is formed with a notch 27 having contact surfaces 25 and 26 on both sides with which the protruding piece 24 of the cutter cam 22 is brought into contact. An expanded portion 28 is formed in the back of the notch 27 to prevent interference with the protruding piece 27. In addition, the cutter arm 15 and the cutter cam 2
2 is designed so that the movable blade 10 rotates from the blade edge 8 of the fixed blade 4 over the step portion 21 when the paper sheet is cut.

In such a structure, the cutter cam 2
When the blade 2 is rotated once, the cutter arm 15 makes one reciprocating rotation about the support shaft 16, whereby the movable blade 10 makes one reciprocating rotation about the support shaft 9. In this case, as shown in FIG.
Since the blade edge 14 of the movable blade 10 is slightly inclined in an arc shape so as to move away from the blade edge 8 of the fixed blade 4 toward the free end side of the movable blade 10, the receipt 2 is cut in the width direction so as to be cut with scissors. Cut from one side to the other.

Here, the process of cutting the receipt 2 is shown in FIG. FIG. 4A shows a state in which the receipt 2 is discharged from the sheet discharge port 3. When the movable blade 10 is rotated in the direction of arrow A from this state, the receipt 2 is cut as shown in FIG. 4B. To be done. At this time, the cut receipt 2 is pushed by the movable blade 10 from the blade edge 8 of the fixed blade 4 to a position beyond the step portion 21, so that when the cut receipt 2 is lowered by its own weight or the like, the bottom surface of the recess 20 is depressed. Supported by. Therefore, as shown in FIG.
However, due to the influence of the strength of the waist of the receipt 2 and the restoring force due to the curl of the receipt 2, the edge of the receipt 2 on the side of the fixed blade 4 is ejected.
Even if it tries to return to the side, it is blocked by the step portion 21.

Therefore, the cut receipt 2 does not enter the sheet discharge port 3. Further, as shown in FIG. 4C, even if the next receipt 2 is cut while the cut receipt 2 remains on the fixed blade 4, the cut receipt 2 previously cut
Is simply pushed by the movable blade 10 and is not cut.

The above is the case of discharging the receipt 2 upward. Next, the case of discharging the receipt 2 in the lateral direction, that is, the case of tilting the figure by 90 ° will be described. In this case, the tip of the receipt 2 discharged from the sheet discharge port 3 may face downward due to its own weight, and the tip may stop due to contact with the surface of the body of the receipt printer, and the tip may stop and curve upward. As a result, when the movable blade 10 returns in the direction of the arrow B, even if the cut-side edge of the cut receipt 2 tries to return between the fixed blade 4 and the movable blade 10, the fixed blade 4 of the receipt 2 may be returned. The side edge is maintained in a state of being supported by the step portion 21 formed between the concave portion 20 of the fixed blade 4 and the bank portion 19. Therefore, the cut receipt 2 does not enter the sheet discharge port 3, and it is possible to avoid double cutting of the receipt 2 and occurrence of a jam.

[0016]

According to the present invention, the stepped portion which is bent from the surface of the fixed blade in the direction opposite to the paper discharge direction is located at a position within the movable range of the movable blade on the paper discharge side surface of the fixed blade. Since it was formed along the edge of the fixed blade,
The cut sheet can be pushed out from the edge of the fixed blade to the position beyond the step by the movable blade, and when the cut sheet returns to the fixed blade side due to its own weight or running resistance in the discharging process. In addition, the edge of the paper sheet on the fixed blade side can be maintained in a state of being supported by the stepped portion of the fixed blade, which allows the cut paper sheet to enter between the fixed blade and the movable blade. It is possible to prevent the double cutting of the paper sheet and the occurrence of jam between the fixed blade and the movable blade due to the cause.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a drive structure of the movable blade of FIG.

FIG. 3 is a plan view showing a relationship between a fixed blade and a movable blade of FIG.

FIG. 4 is a vertical cross-sectional side view showing a process of a receipt cutting operation by the fixed blade and the movable blade of FIG.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a vertical sectional side view showing a process of cutting a receipt by the fixed blade and the movable blade of FIG.

[Explanation of symbols]

 3 Paper discharge port 4 Fixed blade 6 Surface 8 Blade edge 10 Movable blade 21 Step

Claims (1)

[Claims] 1. A fixed blade is provided on one side of a sheet discharge port formed at an end of a sheet conveying path, and a movable blade slidably held along a surface of the fixed blade on the sheet discharge side is provided. Provided at a position within the movable range of the movable blade on the paper discharge side surface of the fixed blade, a step portion that is bent from the surface of the fixed blade in a direction opposite to the paper discharge direction is provided with a blade edge of the fixed blade. A paper sheet cutting device characterized in that it is formed along with.