JP4006117B2 - Sheet cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet cutter, and more particularly to a sheet cutter applied to a receipt issuing unit such as POS, ECR, and ATM.
A receipt issuing unit such as POS, ECR, or ATM includes a printer that prints on a long sheet and a sheet cutter that cuts the printed sheet. Printers are shifting from conventional serial printers to line thermal printers, and have a long life. Along with this, the sheet cutter is also required to have a long life, for example, guarantee of 1 million cuts.
[0002]
[Prior art]
9A and 9B show a conventional sheet cutter 10. The sheet cutter 10 includes a fixed blade 11 that is fixed to a frame 14 and has a linear blade portion 11a, and a movable blade 12 that has a substantially V-shaped blade portion 12a. It is the structure which pressed the center part with force F1. As shown in FIG. 9A, the movable blade 12 has a V-shape with the center slightly sinking. The blade pressure is given by the leaf spring 13. FIG. 9B shows a state before starting sheet cutting. The movable blade 12 is moved in the Y1 direction while being pressed by the leaf spring 13. There are two portions 15 and 16 where the blade portion 12a of the movable blade 12 hits the blade portion 11a of the fixed blade 11, and as the movable blade 12 is moved in the Y1 direction, each of the hit portions is in the X1 and X2 directions. The sheet 17 is moved from both sides toward the center, and the sheet 17 sent in the A direction is cut.
[0003]
[Problems to be solved by the invention]
In the conventional sheet cutter 10, the blade pressure is given by a single leaf spring 13 at the center, and therefore the blade pressure particularly near both ends of the movable blade 12 is not sufficient, and the blade pressure for cutting the sheet 17 is not sufficient. Therefore, when the blade portion 12a of the movable blade 12 and the blade portion 11a of the fixed blade 11 are worn out and the sharpness is deteriorated, the sheet 17 is soon bitten between the fixed blade 11 and the movable blade 12, The sheet 17 cannot be cut, and the sheet cutter 10 reaches the end of its life.
[0004]
Further, since the fixed blade 11 is completely fixed to the frame 14, the fixed blade 11 cannot escape at all. Therefore, when the movable blade 12 is moved, the blade 12a of the movable blade 12 and the blade portion 12a are sometimes moved. The contact between the fixed blade 11 and the blade portion 11a becomes excessively strong, and wear of the blade portions 11a and 12a is likely to occur at this location. Also in this respect, the life of the cutter 10 was shortened.
[0005]
The service life of the sheet cutter 10 was about 300 to 500,000 cuts.
Therefore, an object of the present invention is to provide a sheet cutter that solves the above-described problems.
[0006]
[Means for Solving the Problems]
The invention of claim 1 includes a fixed blade having a linear blade portion and a movable blade having a substantially V-shaped blade portion, and the movable blade moves in a direction overlapping the fixed blade to cut a sheet. When the sheet cutter is configured such that there are two portions where the blade portion of the movable blade contacts the blade portion of the fixed blade, and each of the contact portions moves from both sides toward the center. The central portion in the longitudinal direction is supported, and the movable blade is configured such that the central portion in the longitudinal direction and the left and right side portions against the central portion are pressed against the fixed blade by a spring force, The spring force applied to the central portion of the movable blade and the spring force applied to the left and right side portions provide a blade pressure at which the blade portion of the movable blade hits the blade portion of the fixed blade, and the fixed blade is reversed V The movable blade is warped in a V shape and the movable blade is warped in this state. It is obtained by a structure which moves in a direction overlapping the Teiha.
[0007]
In addition to the spring force acting on the central part of the movable blade, the spring force acting on the left and right side parts gives blade pressure, so that sufficient blade pressure is ensured even when the fixed blade and the movable blade are worn. . Therefore, even when the fixed blade and the movable blade are worn, the sheet is less likely to bite between the fixed blade and the movable blade, and the life of the sheet cutter is extended. In addition, the fixed blade is warped in an inverted V shape, and the movable blade is warped in a V shape. In this state, the movable blade is engaged with the fixed blade, so that the sheet is sharp and wear of the fixed blade and the movable blade progresses. Even in this state, the sheet is less likely to bite between the fixed blade and the movable blade, and the life of the sheet cutter is prolonged.
[0008]
The invention of claim 2 is such that the movable blade has an R-shaped portion at both end portions of the blade portion.
When the blade of the movable blade starts to come into contact with the blade of the fixed blade when cutting the sheet, the movement of the blade of the movable blade against the blade of the fixed blade becomes smooth, and when the sheet is cut, the movable blade Wear of a portion where the blade portion starts to come into contact with the blade portion of the fixed blade (this portion is particularly easily worn) is suppressed.
[0009]
According to a third aspect of the present invention, the fixed blade is tilted in the moving direction of the movable blade with the blade portion raised, and is supported so as to be swingable so as to change the angle of the inclination. It is a thing.
When the movable blade moves in a direction to overlap the fixed blade so as to cut the sheet, the fixed blade increases the inclination, and when the movable blade returns, the fixed blade decreases the inclination and the fixed blade may be twisted. It does not occur and the progress of wear of the blade is suppressed.
[0010]
According to a fourth aspect of the present invention, the fixed blade is supported with play in the moving direction of the movable blade.
When the movable blade moves in a direction that overlaps the fixed blade to cut the sheet, and when the movable blade returns, the fixed blade moves a little as the movable blade moves, and the fixed blade does not break. The progress of wear of the blade portion is suppressed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1A and 1B show a sheet cutter 20 according to an embodiment of the present invention with the cover 26 omitted. As shown in FIGS. 2 to 5, the sheet cutter 20 includes a frame 21, a fixed blade 22 fixed to the frame 21, and a movable blade provided on the frame 21 so as to be movable in the Y1 and Y2 directions. 23, a leaf spring member 24 (see FIG. 5) for applying a blade pressure by pressing the movable blade 23 in the Z2 direction, a movable blade reciprocating mechanism 25 for reciprocating the movable blade 23 in the Y1 and Y2 directions, And a cover 26.
[0012]
The fixed blade 22 has an elongated shape and has a straight blade portion 22a. The movable blade 23 has a substantially V-shaped blade portion 23a, and guide portions 23b and 23c protruding in the Y1 direction on both end sides in the X1 and X2 directions are on the fixed blade 22. When the sheet is cut, the movable blade 23 moves in the Y1 direction, rides on the fixed blade 22 and moves so as to overlap the fixed blade 22. There are two portions 27, 28 where the blade portion 23 a of the movable blade 23 contacts the blade portion 22 a of the fixed blade 22, and each of the contact portions 27, 28 moves from both sides toward the center, and from the slit 29 of the frame 21. The sheet 17 fed in the direction of arrow A is cut by cutting from both upper sides in the width direction toward the center.
[0013]
As shown in FIG. 1A, the movable blade reciprocating mechanism 25 includes a motor 30, a worm gear mechanism 31, a pair of gears 32 and 33 that are engaged with each other, and pins 34 and 35 on the gears 32 and 33. It becomes more. The pins 34 and 35 are fitted in the long holes 23 e and 23 d of the movable blade 23. The motor 30, the worm gear mechanism 31, and the pair of meshing gears 32 and 33 are all attached to the back side of the cover 26. When the motor 30 is driven, the pins 34 and 35 move circularly, and the movable blade 23 first moves in the Y1 direction to the position indicated by the two-dot chain line in FIG. 1 (B), and then moves in the Y2 direction. Return to position.
[0014]
Next, the fixed blade 22 will be described.
As shown in FIGS. 2 and 3, the fixed blade 22 has a planar shape. The fixed blade 22 has a square hole 22c and a claw 22c protruding in the Y1 direction at the center, and has round holes 22d and 22e having a diameter d1 on the X1 and X2 direction end sides.
As shown in FIGS. 2, 3, and 4, a fixed blade attaching portion 21 a is formed on the Y1 direction end side of the frame 21. The fixed blade attachment portion 21 a has a fixed blade support surface 40. The fixed blade support surface 40 has a mountain shape with a high inclination angle θ1 at the center when viewed in the X1 and X2 directions, and is inclined at an inclination angle θ2 in the Z2 direction that decreases from the portion 42 in the Y1 direction. . The central high portion of the fixed blade support surface 40 constitutes a first support portion 41, and the first support portion 41 is higher by a dimension a in the Z1 direction than the height of the X1 and X2 direction ends. The part 42 is a position closer to the dimension b in the Y1 direction than the slit 29, and this part 42 constitutes a second support part.
[0015]
Circular bosses 43 and 44 are formed on the X1 and X2 direction end sides of the fixed blade support surface 40. The diameters of the bosses 43 and 44 are d2, which is smaller than the diameter d1 of the round holes 22d and 22e by about c = 0.15 mm.
A rising wall 45 is formed at the end of the fixed blade support surface 40 in the Y1 direction, and a square window 46 is formed at the center of the rising wall 45. The height dimension e of the square window 46 is about 1.5 mm larger than the thickness dimension f of the claw 22c.
[0016]
A sheet guide member 47 that guides the sheet 17 into the slit 29 is screwed to the back surface of the frame 21. A hook 47a integrated with the sheet guide member 47 protrudes in the Z1 direction from the fixed blade support surface 40.
As shown in FIG. 4, in the fixed blade 22, the round holes 22d and 22e are loosely fitted to the bosses 43 and 44, the claw 22c is loosely fitted to the square window 46, and the square hole 22c is loosely hooked on the hook 47a. In this state, it is mounted on the fixed blade support surface 40.
[0017]
Here, the attachment state of the fixed blade 22 is shown.
(1) About the longitudinal direction (X1, X2 direction) The fixed blade 22 is supported by the first support portion 41 at the center, and elastically forms a chevron when the X1, X2 direction end is pushed in the Z2 direction. Can bend.
(2) With respect to the height (thickness) direction (Z1, Z2 direction), the fixed blade 22 is within the range of the dimension (ef) with the second support part 42 having a corner in FIG. 4 as the center. Thus, it can swing in the direction of arrow B1. That is, the fixed blade 22 can swing around its longitudinal axis.
[0018]
(3) About the width direction (Y1, Y2 direction) The fixed blade 22 can move in the Y1, Y2 direction within the range of the dimension c = (d1-d2).
Next, the movable blade 23 will be described.
The movable blade 23 is placed on the frame 21, and guide portions 23b and 23c protruding in the Y1 direction run on the fixed blade 22, and are inclined at an inclination angle θ3. The inclination angle θ3 gradually increases as the movable blade 23 moves in the Y1 direction. A narrow flat space 49 is provided between the movable blade 23 and the frame 21 on the lower surface side of the portion on the Y2 direction side of the fixed blade 22. As will be described later, the movable blade 23 warps in a V shape by utilizing this narrow flat space 49.
[0019]
The leaf spring member 24 is attached to the lower surface of the cover 26 and has a total of three leaf spring pieces 24a, 24b, and 24c, one in the center and one on each side in the X1 and X2 directions. Each leaf spring piece 24a, 24b, 24c presses the movable blade 23 in the Z2 direction by its spring force. The leaf spring piece 24a presses the central portion of the movable blade 23 with the force F10, and the leaf spring pieces 24b and 24c press the portions closer to the left and right sides of the movable blade 23 with the forces F11 and F12. The forces F11 and F12 are 200 to 300 g, the force F10 is 700 to 800 g, and two to three times the forces F11 and F12.
[0020]
The movable blade 23 is moved while being pressed by the leaf spring piece 24a by the portion denoted by reference numeral 50, while being pushed by the leaf spring piece 24b by the portion denoted by reference numeral 51 and by the leaf spring piece 24b being pushed by the portion indicated by reference numeral 52. Is done.
Further, as shown in an enlarged view in FIG. 5, the portions on the X1 and X2 direction end side of the blade portion 23a and following the guide portions 23b and 23c are R-shaped portions 23a1 and 23a2.
[0021]
Next, the operation when the sheet cutter 20 cuts the sheet 17 will be described.
(1) First, FIG. 7A explaining the operation of the movable blade 23 and the fixed blade 22 when viewed from the Y1 direction is a state before the start of cutting, FIG. 7B is a state in the middle of cutting, and FIG. ) Shows the state at the end of cutting as seen from the Y1 direction. 8 (A), (B), and (C) schematically show the warped state of the movable blade 23 and the fixed blade 22 when corresponding to FIGS. 7 (A), (B), and (C). .
[0022]
Before the start of cutting, the movable blade 23 has the guide portions 23b and 23c riding on the fixed blade 22, and the center portion is pressed with the force F10 and the portions closer to the left and right sides with the forces F11 and F12. As shown in FIG. 8A, the center sinks and warps in a V shape. The fixed blade 22 is held by the guide portions 23b and 23c of the movable blade 23 at the left and right end sides, and warped in an inverted V shape (mountain shape) in which the center portion supported by the first support portion 41 is the top. Yes. The blade portion 23a hits the blade portion 22a at a predetermined blade pressure at the portions 27 and 28.
[0023]
When the movable blade 23 is moved in the Y1 direction, the portion where the blade portion 23a hits the blade portion 22a moves to the center side, and the sheet 17 is cut from both sides in the width direction toward the center. In the middle of the cutting, as shown in FIGS. 7B and 8B, the portion where the blade portion 23a hits the blade portion 22a moves to the portions 27a and 28a, and the state of warping of the movable blade 23 and the fixed blade 22 is as follows. It becomes loose.
[0024]
At the end of cutting, as shown in FIGS. 7C and 8C, the portion where the blade portion 23a hits the blade portion 22a coincides with the portion 27b (28b). The fixed blade 22 is substantially planar.
Thereafter, the movable blade 23 is moved in the Y2 direction to return to the original position, and the state shown in FIGS. 7A and 8A is obtained.
[0025]
In addition to the spring force F10 acting on the central portion of the movable blade 23, the spring forces F11 and F12 acting on the left and right side portions provide blade pressure, so that even the state where the wear of the fixed blade 22 and the movable blade 23 has progressed is sufficient. A high blade pressure can be obtained, and the sheet is less likely to bite between the fixed blade and the movable blade.
Further, the fixed blade 22 is warped in an inverted V shape, and the movable blade 23 is warped in a V shape. In this state, the movable blade 23 is engaged with the fixed blade 22, so that the sheet is sharp and the fixed blade 22 and the movable blade 22 are movable. Even in the state where the wear of the blade 23 has progressed, the phenomenon that the sheet bites between the fixed blade and the movable blade is less likely to occur.
[0026]
(2) Next, the movement of the fixed blade 22 when viewed from the X1 direction will be described.
FIG. 8A shows a state before the end of the previous cut and before starting the next cut.
The fixed blade 22 is close to the Y2 direction in the range of play (dimension c) between the round holes 22d, 22e and the bosses 43, 44, and the second support portion 42 is in the dimension range of the square window 46. Is rotated in the B1 direction around and is approaching horizontal. The fixed blade 22 floats from the fixed blade support surface 40 and forms an angle θ4 with respect to the fixed blade support surface 40, and the fixed blade 22 is inclined at an angle θ5 with respect to the horizontal plane. The inclination angle θ5 is (θ2−θ4).
[0027]
When the movable blade 23 moves in the Y1 direction while rubbing the fixed blade 22, as shown in FIG. 8B, the fixed blade 22 is moved in the Y1 direction within the range of play (dimension c) and the second support is performed. It is rotated in the B2 direction around the part 42.
By moving the fixed blade 22 in this way, it is difficult for the blade portion 23a of the movable blade 23 to be caught by the blade portion 22a of the fixed blade 22 and to be twisted. Therefore, the blade portion 23a of the movable blade 23 and the blade portion 22a of the fixed blade 22 are not unnecessarily damaged, and the progress of wear of the blade portion 23a of the movable blade 23 and the blade portion 22a of the fixed blade 22 is suppressed. It is done.
[0028]
When the movable blade 23 moves in the Y2 direction after the sheet has been cut, as the movable blade 23 moves in the Y2 direction while rubbing the fixed blade 22, as shown in FIG. 22 is moved in the Y2 direction within the range of play (dimension c), and is rotated in the B1 direction around the second support portion 42 within the range of the square window 46 to approach horizontal.
By moving the fixed blade 22 in this way, it is difficult for the blade portion 23a of the movable blade 23 to be caught by the blade portion 22a of the fixed blade 22 and to be twisted. Therefore, the blade portion 23a of the movable blade 23 and the blade portion 22a of the fixed blade 22 are not unnecessarily damaged, and the progress of wear of the blade portion 23a of the movable blade 23 and the blade portion 22a of the fixed blade 22 is suppressed. It is done.
[0029]
(3) Next, the operation of the R-shaped portions 23a1 and 23a2 of the blade portion 23a of the movable blade 23 will be described.
At the start of cutting, when the blade portion 23a of the movable blade 23 begins to engage with the linear blade portion 22a of the fixed blade 22, engagement with the linear blade portion 22a of the fixed blade 22 is started from the R-shaped portions 23a1 and 23a2. . For this reason, the movement of the portions 27 and 28 toward the center side at the initial stage when the movable blade 23 starts moving in the Y1 direction is performed slowly.
[0030]
Therefore, wear is particularly likely to occur at the portion where the blade portion 23a of the movable blade 23 starts to come into contact with the blade portion 22a of the fixed blade 22. However, in this embodiment, since both end sides of the blade portion 23a of the movable blade 23 are the R-shaped portions 23a1 and 23a2, the operation when the blade portion 23a of the movable blade 23 starts to come into contact with the blade portion 22a of the fixed blade 22 As a result, the wear of the portion where the blade portion of the movable blade starts to come into contact with the blade portion of the fixed blade when cutting the sheet is suppressed.
[0031]
As described above, (1) the fixed blade 22 is warped in an inverted V shape, and the movable blade 23 is engaged with the fixed blade 22 while the movable blade 23 is warped in a V shape. Even when the wear of the blade 22 and the movable blade 23 has progressed, the phenomenon that the sheet is less likely to bite between the fixed blade and the movable blade is less likely to occur. It becomes difficult for the blade portion 23a of the blade 23 to be caught by the blade portion 22a of the fixed blade 22, and the blade portion 23a of the movable blade 23 and the blade portion 22a of the fixed blade 22 are not unnecessarily damaged, Further, the progress of wear of the blade portion 23a of the movable blade 23 and the blade portion 22a of the fixed blade 22 is suppressed, and (3) both end sides of the blade portion 23a of the movable blade 23 are R-shaped portions 23a1 and 23a2. The blade portion 23a of the movable blade 23 is fixed. By wearing parts begin contact with the blade portion 22a of 22 is suppressed, the sheet cutter 20 has a longer life than conventional. The inventor conducted a life test of the prototype sheet cutter 20, and did not reach the life even at the stage of 1 million cuts.
[0032]
【The invention's effect】
As described above, according to the first aspect of the invention, the fixed blade supports the central portion in the longitudinal direction, and the movable blade has the central portion in the longitudinal direction and the central portion. The left-right part is pressed against the fixed blade with a spring force, and the blade part of the movable blade is fixed to the blade of the fixed blade by the spring force acting on the central part of the movable blade and the spring force acting on the left-right part. Since the fixed blade is warped in an inverted V shape, the movable blade is warped in a V shape, and the movable blade moves in a direction overlapping the fixed blade in this state. First, in addition to the spring force acting on the central part of the movable blade, the spring force acting on the left and right side parts gives the blade pressure, so that the blade pressure is sufficient even when the fixed blade and the movable blade are worn. Is secured, so even in the state where the wear of the fixed blade and the movable blade has progressed, the sheet Hardly bite between the fixed blade and the movable blade is generated, the life of the sheet cutter can be prolonged. Second, the fixed blade is warped in an inverted V shape, the movable blade is warped in a V shape, and the movable blade is engaged with the fixed blade in this state. Even when the wear has progressed, the sheet is less likely to bite between the fixed blade and the movable blade, and the life of the sheet cutter can be extended. Further, since no members are added and no special material is used, the life of the sheet cutter can be extended without increasing the manufacturing cost.
[0033]
In the invention of claim 2, since the movable blade is configured to have R-shaped portions at both ends of the blade portion, the blade portion of the movable blade is the blade of the fixed blade when the sheet is cut. The movement of the blade of the movable blade when it comes into contact with the blade becomes smooth, and when the sheet is cut, the portion of the movable blade that starts to contact the blade of the fixed blade (this part is (Especially easy to wear) can be suppressed. Therefore, the life of the sheet cutter can be extended.
[0034]
According to a third aspect of the present invention, the fixed blade is tilted in the moving direction of the movable blade with the blade portion raised, and is supported so as to be swingable so as to change the angle of the inclination. Therefore, when the movable blade moves in a direction overlapping the fixed blade to cut the sheet, the fixed blade increases the inclination, and when the movable blade returns, the fixed blade decreases the inclination and the fixed blade. The blade can be prevented from being twisted, and the progress of wear of the blade portion can be suppressed. Therefore, the life of the sheet cutter can be extended.
[0035]
In the invention of claim 4, since the fixed blade is configured to be supported with play in the moving direction of the movable blade, the movable blade overlaps the fixed blade so that the movable blade cuts the sheet. When the movable blade is moved and when the movable blade returns, the fixed blade moves a little as the movable blade moves, and the fixed blade is not distorted, and the progress of wear of the blade portion can be suppressed. Therefore, the life of the sheet cutter can be extended.
[Brief description of the drawings]
FIG. 1 is a view showing a sheet cutter according to an embodiment of the present invention with a cover removed.
2 is an exploded view showing a blade portion of the sheet cutter of FIG. 1. FIG.
FIG. 3 is an exploded view showing a fixed blade with respect to a frame.
FIG. 4 is a view showing a state in which a fixed blade is attached to a frame.
FIG. 5 is a perspective view showing a relationship between a fixed blade and a movable blade.
FIG. 6 is a diagram illustrating a sheet cutting operation.
FIG. 7 is a diagram illustrating a state of warping of the movable blade and the fixed blade during the sheet cutting operation.
FIG. 8 is a diagram illustrating the movement of the fixed blade during the sheet cutting operation.
FIG. 9 is a view showing a conventional sheet cutter.
[Explanation of symbols]
20 Sheet cutter 21 Frame 22 Fixed blade 22a Blade portion 23 Movable blade 23a Blade portion 24 Plate spring members 24a, 24b, 24c Plate spring piece 25 Movable blade reciprocating mechanism 26 Covers 27, 27a, 27b, 28, 28a, 28b Part 40 which is hit Fixed blade support surface 41 First support part 42 Second support part

Claims (6)

The movable blade includes a fixed blade having a linear blade portion and a movable blade having a substantially V-shaped blade portion. When the movable blade moves in a direction overlapping the fixed blade to cut a sheet, the movable blade In the sheet cutter of the configuration in which there are two portions where the blade portion of the fixed blade comes into contact with the blade portion of the fixed blade and each of the contact portions moves from both sides toward the center,
For the fixed blade, support the central part in the longitudinal direction,
The movable blade by a spring, with pressing the central portion of its longitudinal direction the fixed blade in the first spring force, said fixed each second spring force sites left and right side with respect to the central portion The structure is pressed against the blade,
With the first spring force acting on the central portion of the movable blade and the second spring force acting on the left and right side portions, the blade portion of the movable blade gives a blade pressure that hits the blade portion of the fixed blade, sheet cutter the fixed blade warped inverted V-shape, movable blade is warped in a V-shape, movable blade in this state, characterized in that a structure which moves in a direction overlapping the said fixed blade. The sheet cutter according to claim 1, wherein the movable blade is configured to have an R-shaped portion at both end portions of the blade portion. 2. The sheet cutter according to claim 1, wherein the fixed blade is inclined in the moving direction of the movable blade with its blade portion raised, and is supported so as to be swingable so as to change the angle of the inclination. The sheet cutter according to claim 1, wherein the fixed blade is supported with play in a moving direction of the movable blade. The sheet cutter according to claim 1, wherein the first spring force is larger than the second spring force. 6. The sheet cutter according to claim 5, wherein the first spring force is 2 to 3 times the second spring force.

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