JP2001054892A - Cutter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter unit capable of being easily manufactured and assembled, and of exhibiting stable cutting performance for a long time. SOLUTION: A stationary blade 16 is fixed to the bottom wall of a base frame 12, and a movable blade 18 is so provided as to be freely slid. An insertion hole 24 through which papers can be inserted, and a guide hole 26 extended out to the direction perpendicularly intersected with the insertion hole, are formed in the bottom wall 12a of the base frame, and a projection part 34 projected to the side of an outer surface, is formed in an area starting from the guide hole to the insertion hole. A guid pin 36 provided for the movable blade is inserted into the guide hole, and a seat metal 40 capable of sliding over the outer surface of the bottom wall, is mounted to the extended end of the guide pin. The movable blade is pressed onto the stationary blade side by sliding the seat metal over the projection part 34 as the movable blade is moved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter unit for cutting roll paper or continuous recording paper to an arbitrary length in a printer mechanism mounted on a financial terminal, a register, a ticket issuing machine, or the like.

[0002]

2. Description of the Related Art Generally, a printer mechanism mounted on a financial terminal, a register, a ticket issuing machine or the like includes a cutter unit for cutting roll paper or continuous recording paper into an arbitrary length. As a typical example of such a cutter unit, a cutter unit disclosed in Japanese Patent Application Laid-Open No. 60-207799 is provided with a movable blade that slides up and down and a fixed blade attached to a frame. These movable blades and fixed blades are tapered from one end to the other end, and are finished to have sharp cutting blades adjacent to each other. The movable blade is urged by a spring toward the fixed blade, and slides up and down on the plane of the fixed blade with respect to the fixed blade to cut across the sheet.

Conventionally, in order to maintain a sufficiently long life and sharpness, it is necessary to apply considerable processing to the blade material.
There is a need for steps such as bending the movable blade. Further, according to the cutter unit disclosed in Japanese Patent Publication No. Hei 8-22517, in order to keep a sufficient cutting angle between the fixed blade and the movable blade, the fixed blade is intentionally made to be convex with respect to the movable blade. Processing. Further, according to the cutter unit disclosed in Japanese Patent Publication No. 56-34440, the movable blade
It is elastically pressed against the fixed blade by a leaf spring.

[0004]

As described above, in order to give the blade material of the movable blade and the fixed blade a sufficiently long life and sharpness, it is necessary to perform considerable processing such as bending the movable blade. However, since a very hard material such as an alloy steel, a tool steel, or a special steel is usually used as a blade material, it is very difficult to actually perform bending drawing or the like.

[0005] Further, in the method of fixing the fixed blade disclosed in Japanese Patent Publication No. Hei 8-22517, it is necessary to add a special operation to warp the fixed blade, and at the same time, the amount of warpage is varied to a certain degree. Need to be managed within. Therefore, this cutter unit is poor in manufacturability and assemblability, and becomes an uneconomical cutter unit.

Further, as disclosed in Japanese Patent Publication No. Hei 8-22517, when a leaf spring is used as means for resiliently moving the movable blade, the leaf spring is always appropriate and suitable depending on the mounting accuracy of the leaf spring, processing accuracy, wear and the like. It becomes difficult to apply a symmetric pressing force to the movable blade. For this reason, before the original life of the blade material, insufficient cutting may occur due to insufficient pressing, or knitting wear, poor cutting, etc. of the blade material due to uneven pressing in the left and right directions.

An object of the present invention is to provide a cutter unit which is easy to manufacture and assemble and can exhibit a stable cutting ability for a long period of time.

[0008]

In order to achieve the above object, a cutter unit according to the present invention is provided with a fixed blade fixed to a frame and movably mounted on the frame between a cutting position and an open position. A movable blade that cuts an object to be cut inserted between the fixed blade and the fixed blade in cooperation with the fixed blade, wherein the frame moves in accordance with movement of the movable blade to the cutting position side, It has a frame pressing portion for pressing the movable blade against the fixed blade.

According to the cutter unit of the present invention, the frame includes an insertion hole through which the object is inserted, a guide hole extending in a direction intersecting the insertion hole, and
The fixed blade is fixed to the bottom wall in alignment with the insertion hole, and the movable blade is slidably provided on the bottom wall, and A guide pin slidably inserted into the guide hole; and a stopper attached to the guide pin and slidably abutting on an outer surface of the bottom wall, wherein the frame pressing portion is provided with It is characterized by having a convex portion formed by projecting the bottom wall outward on the moving path.

Further, the cutter unit according to the present invention includes an elastic body attached to the frame and engaged with a longitudinally central portion of the movable blade to press the movable blade toward the fixed blade. It is characterized by.

According to the cutter unit constructed as described above, when the movable blade on the frame moves from the open position to the cutting position while contacting the fixed blade, the movable portion is moved by the pressing portion provided on the frame. The blade is pressed against the fixed blade. Thereby, the movable blade can always maintain the required shear cutting angle, and can exhibit stable cutting ability.

The fixed blade and the movable blade do not need to be subjected to special processing, so that the manufacturability and the assemblability are improved, and an economical and highly reliable cutter unit is provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cutter unit according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the cutter unit includes a substantially rectangular box-shaped casing 10 made of, for example, mild steel, and the casing 10 has a rectangular base frame 12 having an open upper surface. And a rectangular cover 14 provided so as to cover substantially the upper half of the base frame. The base frame 12 is provided with a fixed blade 16, a slidable movable blade 18, a torsion coil spring 20 functioning as an elastic body, and the like. The cover 14 is provided with a drive mechanism 22 for driving the movable blade 18 to open and close. I have.

More specifically, as shown in FIGS. 2 to 4, the base frame 12 includes a rectangular bottom wall 12a and a pair of side walls 12 standing upright along two opposing side edges of the bottom wall.
b, and the upper wall 12c erected along the upper edge of the bottom wall
And the lower edge is open. On the lower end side of the bottom wall 12a, an elongated insertion hole 24 through which a sheet to be cut by the cutter unit is inserted is formed. This insertion hole 2
4 is a bottom wall 12 extending over substantially the entire length between the pair of side walls 12b.
a extends in the width direction.

The movable blade 1 is mounted on the base frame 12.
An elongated guide hole 26 for guiding the movement of the torsion coil 8, a pair of spring mounting holes 28 for mounting the torsion coil spring 20, and a pair of spring receivers 30 are formed.

The guide hole 26 is formed substantially at the center of the bottom wall 12a, and extends in the vertical direction, that is, in the direction perpendicular to the longitudinal direction of the insertion hole 24. The pair of spring mounting holes 28 are located on both sides of the guide hole 26, and the bottom wall 12a and the upper wall 1
2c. Each spring mounting hole 28 is formed in a substantially rectangular shape, and the upper wall 12c has
A pair of engaging projections 32 projecting into the spring mounting hole 28 are formed. Further, the pair of spring receivers 30 are provided in the guide holes 2.
6 are provided adjacent to the spring mounting holes 28, respectively.

Further, on the bottom wall 12a of the base frame 12, a portion extending from the intermediate portion of the guide hole 26 to the insertion hole 24 is formed so as to protrude outward as shown in FIGS. , And a convex portion 34 functioning as a frame pressing portion. The projection 34 is formed in the guide hole 26.
The width gradually increases from the side toward the insertion hole 24, and
The protruding height gradually increases from the guide hole side toward the insertion hole. The shape of the convex portion 34 along the width direction of the bottom wall 12a is curved such that the central portion protrudes most. In addition, the convex portion 34 is formed from an intermediate portion of the guide hole 26, but may be formed from the upper end portion of the guide hole to the insertion hole 24.

As shown in FIG. 3 to FIG.
Is formed in an elongated rectangular shape, and is fixed on the lower end of the bottom wall 12 a of the base frame 12. And the fixed blade 16
The blade edge 16a extends over substantially the entire width of the bottom wall 12a and is aligned with the lower edge of the insertion hole 24.

The movable blade 18 is formed in a substantially Y shape and is slidably disposed on the bottom wall 12a of the base frame 12. The movable blade 18 includes a blade main body 18a extending over substantially the entire length of the bottom wall 12a in the width direction, and
And a support portion 18b extending to the 2c side.
A is formed with a cutting edge 18c located on the insertion hole 24 side. The movable blade 18 and the fixed blade 16 are formed of a flat plate material without being bent or curved. The fixed blade 16 and the movable blade 18 are made of a material harder than the base frame 12, for example, an alloy steel.

The support portion 18b has two guide pins 36,
38 are fixed, and are slidably inserted into the guide holes 26 of the base frame 12, respectively. Guide pin 3
The guide pins 36, 38 are arranged in the vertical direction, that is, in the direction orthogonal to the insertion hole 24, and the guide pin 36 located on the blade main body 18a side projects beyond the bottom wall 12a.
An annular washer 40 is fitted to the extended end of the guide pin 36, and is fixed by an E-ring 41. The washer 40 has a diameter larger than the width of the guide hole 26, functions as a stopper, and slidably contacts the outer surface of the bottom wall 12a. Therefore, the movable blade 18 is movably guided by the two guide pins 36 and 38 and the guide hole 26 along the longitudinal direction of the guide hole, that is, the direction orthogonal to the insertion hole 24, and the washer 40. Is held on the bottom wall 12a.

At the center of the movable blade 18, a stepped pivot 44 is provided.
The pressing portion of the torsion coil spring 20 and the link arm 46 are engaged with the pivot 44. In other words, the torsion coil spring 20 connects a pair of coil portions 20a coaxially arranged with a predetermined gap therebetween and opposed ends of these coil portions, and extends in a direction orthogonal to the coil portions. It has a pressing portion 20b and an arm portion 20c extending from the outer end of each coil portion, and is formed by processing a single wire.

As can be clearly understood from FIGS. 2 to 4, each coil portion 20a of the torsion coil spring 20 is mounted in the spring mounting hole 28 of the base frame 12 while being engaged with the pair of engaging projections 32, and is positioned. Have been. Each of the arms 20c is locked by the corresponding spring receiver 30, and the pressing portion 20b is engaged with the pivot 44 of the movable blade 18. As a result, the torsion coil spring 20 is mounted and held at a predetermined position on the base frame 12, and moves the movable blade 18 through the pressing portion 20 b to the bottom wall 12.
a and the fixed blade 16.

As shown in FIGS. 3 and 4, one end of the link arm 46 is pivotally connected to the base frame 1 by a pivot 48.
2 is rotatably supported on the bottom wall 12a. Also,
The link arm 46 has a first elongated hole 50 formed at an intermediate portion thereof, and a second elongated hole 52 formed at the other end thereof. The first elongated hole 50 is provided on the movable blade 18. The tip of the pivot 44 is slidably inserted. Therefore, the link arm 46 is rotatable in conjunction with the vertical movement of the movable blade 18.

On the other hand, as shown in FIG. 3, the drive mechanism 22 for moving the movable blade 18 rotates a worm wheel via a worm wheel 54 rotatably mounted on the inner surface of the cover 14 and a worm gear 55. Motor 5
6 and a cover 14 facing the outer peripheral surface of the worm wheel.
And a sensor 58 for detecting the rotational position of the worm wheel.

An engaging pin 60 is erected on the worm wheel 54 and is eccentric from the rotation center of the worm wheel. The engagement pin 60 is slidably engaged with the second elongated hole 52 of the link arm 46 when the cover 14 is attached to the base frame 12. Accordingly, by rotating the worm wheel 54 by the motor 56, the link arm 46 rotates about the pivot 48, and opens and closes the movable blade 18 via the pivot 44.

According to the cutter unit configured as described above, normally, the movable blade 18 is held in an open state, that is, in a state in which a space for passing paper between the fixed blade 16 and the movable blade is opened. I have. Then, the sensor 58 of the drive mechanism 22 detects a position where the movable blade 18 is opened as a home position.

On the other hand, when cutting the sheet sent through the insertion hole 24, the motor 56 is driven to rotate the worm gear 55, and as a result, the worm wheel 54 is rotated at a reduced speed. At this time, the engagement pin 60 provided on the worm wheel 54 also moves on the circumference at the same time, and the link arm 46 moves in an arc around the pivot 48. Thereby, via the pivot 44 engaged with the link arm 46,
The movable blade 18 moves toward the closed position, that is, toward the cutting position, toward the fixed blade 16.

When the movable blade 18 moves toward the closed position,
Along with this, the washer 40 attached to the guide pin 36 moves while sliding on the outer surface of the bottom wall of the base frame 12. Here, a region between the guide hole 26 and the insertion hole 24 in the bottom wall 12a is formed as a convex portion 34. Therefore, the washer 40 slides on the outer surface of the convex portion 34 to exert a force in a direction of pressing the movable blade 18 toward the bottom wall 12a. Therefore, while the movable blade 18 moves to the cutting position, the cutting edge portion of the movable blade is pressed against the fixed blade 16 and always maintains the required shear cutting angle.

In addition, the movable blade 18 is constantly pressed toward the fixed blade 16 by the torsion coil spring 20. Therefore, the movable blade 18 can maintain a stable shear cutting angle, and the contact pressure can be adjusted by the torsion coil spring 20.
It can be easily performed by changing the load.

In this manner, the movable blade 18 descending to the cutting position allows the paper inserted through the insertion hole 24 to be moved by the fixed blade 1.
Cut in cooperation with 6. After cutting the paper, the movable blade 18 is continuously raised to the open position. When the home position is detected by the sensor 58, the motor 56 is stopped.

According to the cutter unit configured as described above, the movable blade 18 is provided by providing the convex portion 34 functioning as a pressing portion on the bottom wall 12a of the base frame 12.
Is applied to the fixed blade 16 side, and a stable shear cutting angle can be obtained. Therefore, the fixed blade 16 made of a harder material than the base frame 12 is used.
In addition, there is no need to perform special deformation processing, correction processing, and the like on the movable blade 18 itself, so that the manufacture and assembly of the cutter unit are facilitated, and at the same time, the precision control of the parts is facilitated, and the manufacturing cost can be reduced.

Further, in addition to the function of the convex portion 34, by applying a pressing force to the movable blade 18 by the torsion coil spring 20, the shearing cutting angle can be more stably maintained, and the fixed blade and the movable blade No cutting failure due to insufficient pressure contact occurs before the life of the device. Further, the torsion coil spring 20 applies a pressing force to the central portion of the movable blade 18, and applies this pressing force uniformly to the movable blade in the left and right directions. Therefore, it is possible to prevent knitting wear and cutting failure of the movable blade and the fixed blade due to uneven elastic pressure on the left and right. Therefore, an economical and highly reliable cutter unit can be obtained.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the convex portion of the base frame only needs to be provided at least on the movement path of the washer, and its shape and the like can be changed as necessary.

[0035]

As described in detail above, according to the present invention, the required shear cutting angle can be stably maintained without performing special processing on the fixed blade and the movable blade, and the production and assembly can be performed. It is possible to provide an economical and highly reliable cutter unit that is easy and can exhibit a stable cutting ability for a long period of time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cutter unit according to an embodiment of the present invention.

FIG. 2 is a rear view of the cutter unit.

FIG. 3 is an exploded perspective view showing an exploded view of a base frame and a cover of the cutter unit.

FIG. 4 is an exploded perspective view showing the base frame, the fixed blade, the movable blade, the torsion coil spring, and the link arm.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view taken along line BB in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing | casing 12 ... Base frame (frame) 14 ... Cover 16 ... Fixed blade 18 ... Movable blade 20 ... Torsion coil spring (elastic body) 22 ... Drive mechanism 24 ... Insertion hole 26 ... Guide hole 28 ... Spring mounting hole 34 ... Convex part (frame pressing part) 40 ... washer 46 ... link arm 54 ... worm wheel 56 ... motor 58 ... sensor

Claims (6)

[Claims] 1. A fixed blade fixed to a frame, and an object to be cut which is movably mounted on the frame between a cutting position and an open position, and which is inserted between the fixed blade and the fixed blade. A movable blade that cooperatively cuts the movable blade, wherein the frame includes a frame pressing portion that presses the movable blade against the fixed blade in accordance with movement of the movable blade to the cutting position side. Cutter unit. 2. The frame has a bottom wall formed with an insertion hole through which an object to be cut is inserted, and a guide hole extending in a direction intersecting with the insertion hole. The movable blade is slidably provided on the bottom wall, is aligned with the insertion hole and is slidably provided on the bottom wall, and the guide pin is slidably inserted into the guide hole; A stopper attached to a pin and slidably abutting on an outer surface of the bottom wall, wherein the frame pressing portion is formed by projecting the bottom wall outward on a movement path of the stopper. The cutter unit according to claim 1, wherein the cutter unit has a projected portion. 3. The cutter unit according to claim 2, wherein the height of the protrusion is gradually increased from the guide hole side toward the insertion hole side. 4. An elastic body attached to the frame and engaged with a longitudinally central portion of the movable blade, the elastic body pressing the movable blade toward the fixed blade. The cutter unit according to any one of claims 3 to 3. 5. The resilient member is a torsion coil spring. The torsion coil spring connects a pair of coil portions coaxially arranged at a predetermined distance from each other and opposite ends of the coil portions. 5. The device according to claim 4, further comprising: a pressing portion that engages with the movable blade, and an arm portion that extends from an outer end of each coil portion and is locked to the frame. 6. Cutter unit. 6. The frame has a pair of spring mounting holes in which the coil portion of the torsion coil spring is mounted, and an engagement projecting into each spring mounting hole and engaging with the coil portion to position the coil portion. The cutter unit according to claim 5, further comprising a projection, and a pair of spring receivers to which the arm portion of the torsion coil spring is locked.