JP2003019690A - Paper sheet cutter and printer using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper sheet cutter capable of preventing a carriage 3 from being rocked in the course of moving the carriage along a stationary knife and cutting the paper sheet to cut a thick paper sheet with a good linearly cutting surface, and a printer using it. SOLUTION: This paper sheet cutter is provided with a paper sheet 11, a long stationary knife 18, a rotary knife 20 capable of cutting the paper sheet 11 by moving along the stationary knife 18, a cutter shaft 23 formed in the center of rotation of the rotary knife 20, a carriage 24 rotatably supporting the rotary knife 20 by journaling the cutter shaft 23, and a guide member 25 supporting the carriage 24 to be reciprocated along the stationary knife 18. The vicinity of the cutter shaft 23 of the carriage 24 is supported on the guide member 25, and the carriage 24 is moved along the stationary knife 18, whereby the paper sheet 11 is cut between the rotary knife 20 and the stationary knife 18.

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 and a printer using the same, and more particularly to a sheet cutting device capable of cutting a sheet into a predetermined length and a printer using the same.

[0002]

2. Description of the Related Art A paper cutting device configured to cut a paper into a predetermined length after printing a desired image on a roll of paper is widely used in printers, which are output devices of personal computers and the like. There is.

As a sheet cutting device used in such a printer (not shown), as shown in FIG. 6, the sheet is formed to be longer than the width dimension of the sheet (not shown) (in the direction orthogonal to the sheet surface). Fixed blade 1 and cutting edge surface 1a of this fixed blade 1
Is arranged in a state where the outer peripheral side of the rotary blade 2 is in contact with. The rotary blade 2 is axially supported by a cutter shaft 2a, and the cutter shaft 2a is supported by a carriage 3 so that the rotary blade 2 can rotate. Then, the rotary blade 2 is rotated by moving the carriage 3 along the fixed blade 1 while the rotary blade 2 is in contact with the fixed blade 1.

Further, the carriage 3 has an L-shaped support portion 3a formed at the upper end thereof, and the support portion 3a is supported by the guide member 4 on the fixed blade 1. The guide member 4 is
The end portion is bent upward to form a supporting portion 4a, and the supporting portion 3a of the carriage 3 engages with the supporting portion 4a. The carriage 3 moves along the fixed blade 1 so that the rotary blade 2 can move along the fixed blade 1 while being in contact with the fixed blade 1.

For a sheet (not shown) on which desired characters and the like are printed by a thermal head (not shown) on the printer side, a fixed blade 1 is rotated by rotating a sheet feed roller (not shown). The lower part of the can be conveyed in the direction of arrow A. Then, when the printed portion is conveyed to the outside of the rotary blade 2 (on the left side in the drawing), the carriage 3 moves along the fixed blade 1, The rotary blade 2 moves while being in contact with the blade tip surface 1a of the fixed blade 1, and cuts a sheet between the rotary blade 2 and the fixed blade 1 in a predetermined length.

Such a paper cutting device has a simple structure and can easily cut the roll paper to an arbitrary length, and is widely used in printers as output devices for personal computers and the like.

[0007]

However, in the carriage 3 of the conventional sheet cutting device, the support portion 3a of the rotary blade 2 located at a position apart from the cutter shaft 2a is supported at one point by the guide member 4. Therefore, the lower portion of the carriage 3 becomes free, and the lower portion of the carriage 3 may shake in the direction of arrow B. When the lower part of the carriage 3 moves in the direction of arrow B, for example, when trying to cut a thick sheet or the like, the lower part of the carriage 3 sways due to the cutting load applied to the rotary blade 2 and the rotary blade 2 and the fixed blade. There is a possibility that a gap is generated between the blade edge surface 1a of No. 1 and thick paper or the like cannot be cut cleanly.

The present invention has been made in view of the above-mentioned problems, and prevents the carriage 3 from swaying while moving the carriage along the fixed blade to cut the paper.
It is an object of the present invention to provide a paper cutting device and a printer using the paper cutting device that can clean a cut surface linearly even with thick paper.

[0009]

As a first solving means for solving the above-mentioned problems, the sheet cutting apparatus of the present invention comprises a sheet, an elongated fixed blade, and movement along the fixed blade. A rotary blade capable of cutting the paper by the cutter, a cutter shaft formed at the center of rotation of the rotary blade, and a carriage that rotatably supports the rotary blade by pivotally supporting the cutter shaft,
A guide member that supports the carriage so as to be capable of reciprocating along the fixed blade, the guide member is disposed below the fixed blade, and the vicinity of the cutter shaft of the carriage is supported by the guide member. The paper is cut between the rotary blade and the fixed blade by moving the carriage along the fixed blade.

As a second means for solving the above-mentioned problems, the guide member is formed by bending a plate-shaped end portion at a substantially right angle to form a bent portion, and the carriage is
By forming an engaging portion that can be engaged with the bent portion near the cutter shaft and engaging the engaging portion with the bent portion, the movement of the rotary blade away from the fixed blade is restricted. It was configured like this.

As a third means for solving the above-mentioned problems, the rotary blade is attached to a side surface of a disk-shaped flywheel, and the flywheel is arranged below the fixed blade, and the flywheel is attached. An O-ring is attached to the outer peripheral part of the sheet, and when the O-ring is elastically contacted with the fixed blade and the carriage is moved along the fixed blade, the sheet is nipped between the O-ring and the fixed blade. The rotary blade is rotated via the flywheel by the frictional resistance between the paper and the O-ring.

Further, as a fourth means for solving the above-mentioned problems, the carriage is stretched around a belt capable of transmitting the driving force of a driving source, and when the driving source is driven, the carriage passes through the belt. The carriage is pulled,
The rotary blade is configured to move along the fixed blade.

As a fifth means for solving the above-mentioned problems, the rotary blade is configured to elastically contact the fixed blade by the urging force of a coil spring wound around the cutter shaft.

A printer using the paper cutting device of the present invention as a sixth solving means for solving the above-mentioned problems is the paper cutting device according to any one of claims 1 to 5. A printing means is provided, and the paper printed by the printing means is cut by the paper cutting device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A printer using a paper cutting device of the present invention will be described below with reference to FIGS. First, FIG. 1 is a sectional view of an essential part of a printer using a paper cutting device according to the present invention, FIG. 2 is a perspective view of an essential part of FIG. 1, and FIG. 3 is a side view of the paper cutting device according to the present invention. 4 is a cross-sectional view of the main part of FIG. 3, and FIG. 5 is a perspective view of the main part of the sheet cutting apparatus according to the present invention.

A printer using the paper cutting device of the present invention will be explained with reference to FIG. 1 by using a serial type thermal printer, for example. The paper 11 is a strip-shaped roll paper wound into a roll. 11 is placed on the sheet placing section 12 on the right side in the figure. Also, the sheet stacking unit 1
The paper 11 placed on the sheet 2 is attached to the thermal head 16 described later.
A paper feed roller 13 for conveying to the side and a pressure contact roller 14 that comes into pressure contact with the paper feed roller 13 at a predetermined pressure contact pressure are arranged. The paper feed roller 13 can be rotationally driven in the arrow C or arrow D direction.

Then, the paper feed roller 13 and the pressure contact roller 1
4, the paper 11 is pressed and sandwiched between the paper feeding roller 13 and
When is driven to rotate in the direction of arrow C, the paper 11 can be transported in the transport direction of arrow E. Also, the paper feed roller 1
When 3 is rotationally driven in the direction of arrow D, the paper 11 can be returned in the direction of arrow F, which is the opposite direction of arrow E.

On the downstream side of the paper feed roller 13 in the conveying direction of the arrow E of the paper 11, a flat platen 15, which is a printing means, is brought into contact with or separated from the platen 15 (head up / down). A possible thermal head 16 is provided. A plurality of heat generating elements (not shown) are formed on the thermal head 16. When the paper 11 is plain paper, the platen 5 and the thermal head 6
And an ink ribbon (not shown) are positioned between them to selectively heat the plurality of heating elements of the thermal head 16 according to the print information, whereby the ink of the ink ribbon is transferred to the paper 11. The desired image can be printed.

On the downstream side of the thermal head 16 in the conveying direction of the arrow E of the paper 11, a paper cutting device 17 of the present invention is provided which can cut the paper 11 to a predetermined length. The sheet cutting device 17 has a fixed blade 18 made of a long steel plate, and the fixed blade 18 is conveyed between the thermal head 16 in the head-up state and the platen 15 in the conveying direction of arrow E. It is arranged on the top of the paper 11.

A blade tip surface 18a is formed on the left end surface of the fixed blade 18 in the figure. A rail member 19 that supports a carriage 24, which will be described later, movably along the fixed blade 18 is provided on the fixed blade 18 with screws or the like.
Is stuck to. The rail member 19 is formed with a guide groove 19a with which a first engaging portion 24b of the carriage 24 described later can be engaged.

A rotary blade 20 having a sharp blade edge on its outer peripheral surface is in elastic contact with the cutting edge surface 18a of the fixed blade 18, and the rotary blade 20 is shown by arrows G and H along the fixed blade 18.
It can be reciprocated in any direction. The rotary blade 20 is
As shown in FIGS. 3 and 4, the disc-shaped flywheel 21 is screwed to the side surface. And flywheel 21
Is disposed below the fixed blade 18, and an O-ring 22 made of rubber or the like having a large friction coefficient is attached to the outer periphery of the flywheel 21. Further, a cutter shaft 23 is inserted through the centers of rotation of the rotary blade 20 and the flywheel 21.

The cutter shaft 23 is rotatably supported by a carriage 24 made of a resin material, and the rotary blade 20 attached to the flywheel 21 is rotatable. A hollow cutter mounting portion 24a is formed on the carriage 24, and the rotary blade 20 and the flywheel 21 are positioned on the cutter mounting portion 24a. Further, in the carriage 24, a groove-shaped second engaging portion 24c is formed in the vicinity of the cutter shaft 23 on the right side of the drawing so that a bent portion 25a of a guide member 25 described later can engage with the groove.

The second engaging portion 24c has a predetermined gap with the fixed blade 18 and can engage with the guide member 25 made of a metal plate or the like disposed below the fixed blade 18. ing. The guide member 25 has a bent portion 15a whose end portion is bent at a substantially right angle downward in the drawing, and the second engaging portion 24c of the carriage 24 can be engaged with the bent portion 25a. Then, by engaging the second engaging portion 24c of the carriage 24 with the bent portion 25a,
The horizontal movement of the arrow J of the carriage 24 is regulated while the carriage 24 is moving along the fixed blade 18.

Therefore, while the rotary blade 20 is moved along the fixed blade 18 to cut the paper 11, the movement of the rotary blade 20 away from the fixed blade 18 is restricted. The carriage 24 is located at the home position (not shown) at the moving end in the direction of arrow H shown in FIG. 2 in the standby state where the paper 11 is not cut. The home position is a position where it does not interfere with the conveyance of the sheet 11 in the conveying direction of the arrow E shown in FIG. 1, and the carriage 24 is on standby until the printed sheet 11 is conveyed.

Further, below the carriage 24 in the drawing, a belt mounting portion 24d to which a belt 27 described later can be mounted is formed. A coil spring 26 is wound around the cutter shaft 23 protruding leftward from the rotary blade 20 shown in FIG. 4, and the urging force of the coil spring 26 causes the rotary blade 20 to rotate.
Is surely elastically contacted with the fixed blade 18. Further, in the carriage 24 shown in FIG. 4, a belt mounting portion 24d is formed in the lower portion, and a belt 27 composed of a V belt can be mounted on the belt mounting portion 24d. The belt 27 is stretched around a belt drive gear 28 arranged below the sheet cutting device 17 shown in FIG.

When the driving source 29 composed of a motor is rotationally driven, the belt driving gear 28 gear-connected to the driving source 29 is rotated, and the carriage 24 is passed through the belt 27.
However, as shown in FIG. 2, it can reciprocate in the directions of arrows G and H. Further, in the printer using the sheet cutting device of the present invention, the outer peripheral portion is processed into a knurled notch on the outer peripheral side, as shown in FIG. 2, on the downstream side of the sheet cutting device 17 in the conveying direction of the arrow E of the sheet 11. A paper discharge roller 30 is provided. Then, the sheet 11 after being cut by the sheet cutting device 17 is discharged to the outside of the printer by the rotation of the sheet discharge roller 30.

The operation of the printer using the paper cutting device 17 of the present invention will be described first.
When the front end of the paper 11 placed on the sheet 2 is sandwiched between the paper feed roller 13 and the pressure contact roller 14 and the paper feed roller 13 is rotated in the direction of arrow C, the front end of the paper 11 is indicated by arrow E.
Are transported in the transport direction of. Then, the thermal head 16 and the platen 15 in which the leading end of the paper 11 is in a head-up state
When the sheet 11 passes between the platen 15 and the platen 15, the thermal head 16 heads down to sandwich the sheet 11 with the platen 15.

At this time, if the paper 11 is plain paper, the paper 1
An ink ribbon (not shown) is sandwiched between 1 and the thermal head 16. In this state, a plurality of heating elements (not shown) of the thermal head 16 are selectively caused to generate heat in accordance with the print information, and the thermal head 16 is moved in the row direction of the paper 11 in the direction of the arrow G, so that the paper 11 is printed. A desired image can be printed.

When the desired image is printed on the printing area (not shown) of the paper 11, the paper feed roller 13 is rotated in the direction of arrow C, and the paper 11 is conveyed by a predetermined amount in the direction of arrow E. To do. Then, the predetermined position where the printed sheet 11 is to be cut is aligned with the rotary blade 20. next,
When the drive source 29 is driven and the carriage 24 is pulled through the belt 27 in the direction of arrow G, the rotary blade 20 moves along the fixed blade 18 and the rotary blade 20 rotates.
Then, the paper 11 is cut between the fixed blade 18 and the rotary blade 20, and the cut paper 11 is discharged to the outside of the printer by the rotation of the paper discharge roller 30.

The paper cutting device 17 of the present invention as described above.
Since the second support portion 24C of the carriage 24 near the cutter shaft 23 is supported by the guide member 25, the movement of the rotary blade 20 in the direction away from the fixed blade 18 can be restricted. Further, since the first engaging portion 24b of the carriage 24 is supported by the rail member 19 on the fixed blade 18, the vertical movement of the carriage 24 can be restricted. Therefore, as an output device of a personal computer or the like, a paper cutting device 17 of the present invention can be applied to a printer or the like using roll paper.
By using, it is possible to cut the paper 11 in a straight line with an arbitrary length and to cleanly cut it.

[0031]

As described above, the sheet cutting apparatus of the present invention supports the rotary blade and the fixed blade by supporting the vicinity of the cutter axis of the carriage on the guide member and moving the carriage along the fixed blade. Since the paper is cut between them, the horizontal movement of the carriage during the cutting of the paper can be restricted. Therefore, the paper can be cut linearly and neatly.

Further, since the engaging portion of the carriage is engaged with the bent portion of the guide member to restrict the movement of the rotary blade in the direction away from the fixed blade, the movement of the carriage is regulated with a simple structure. It is possible to provide a paper cutting device that can do this. Further, by regulating the movement of the rotary blade in the direction away from the fixed blade, it is possible to eliminate defective cutting of the paper.

When the carriage is moved along the fixed blade, the paper is nipped between the O-ring and the fixed blade, and due to the frictional resistance between the paper and the O-ring, the rotary blade is moved through the flywheel. Since the rotary blade is rotated, the rotary blade can be reliably rotated without slipping with respect to the fixed blade, and high-quality paper cutting without defective cutting of the paper to be cut can be performed.

When the drive source is driven, the carriage is pulled through the belt so that the rotary blade moves along the fixed blade, so that the carriage moves smoothly along the fixed blade. Can be made.

Further, since the rotary blade is made to elastically contact the fixed blade by the biasing force of the coil spring wound around the cutter shaft, the rotary blade does not separate from the fixed blade.
High quality paper can be cut.

Further, the paper cutting device according to any one of claims 1 to 5 is provided with a printing means, and the paper printed by the printing means is cut by the paper cutting device. It is possible to provide a printer using a paper cutting device capable of cutting a printed paper in a straight line.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a printer using a paper cutting device according to the present invention.

FIG. 2 is a perspective view of an essential part of FIG.

FIG. 3 is a side view of the sheet cutting device according to the present invention.

FIG. 4 is a cross-sectional view of the main parts of FIG.

FIG. 5 is a perspective view of a main part of a sheet cutting device according to the present invention.

FIG. 6 is a cross-sectional view of a main part of a conventional paper cutting device.

[Explanation of symbols]

11 sheets 12 Paper stacking section 13 Paper feed roller 14 Pressure roller 15 Platen 16 thermal head 17 Paper cutting device 18 fixed blade 18a Edge surface 19 Rail member 19a guide groove 20 rotary blades 21 flywheel 22 O-ring 23 Cutter axis 24 carriage 24a Cutter mounting part 24b First engaging portion 24c Second engaging portion 24d Belt installation part 25 Guide member 25a Bent section 27 belts

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C058 AB07 AC06 AC11 AD01 AE04                       AF06 AF20 AF31 AF51 LA03                       LA13 LB10 LB17 LB24 LB36                       LC12                 3C027 SS06

Claims (6)

[Claims] 1. A paper sheet, an elongated fixed blade, a rotary blade capable of cutting the paper sheet by moving along the fixed blade, and a cutter shaft formed at the center of rotation of the rotary blade.
A carriage that rotatably supports the cutter blade by supporting the cutter shaft and a guide member that supports the carriage so as to reciprocate along the fixed blade are provided below the fixed blade. The carriage is supported by the guide member in the vicinity of the cutter shaft of the carriage, and the carriage is moved along the fixed blade to cut the paper between the rotary blade and the fixed blade. A paper cutting device characterized in that 2. The guide member forms a bent portion by bending a plate-shaped end portion at a substantially right angle, and the carriage comprises:
By forming an engaging portion that can be engaged with the bent portion near the cutter shaft and engaging the engaging portion with the bent portion, the movement of the rotary blade away from the fixed blade is restricted. The sheet cutting device according to claim 1, wherein the sheet cutting device is configured as described above. 3. The rotary blade is attached to a side surface of a disk-shaped flywheel, the flywheel is arranged below the fixed blade, and an O-ring is attached to an outer peripheral portion of the flywheel. When the carriage is moved along the fixed blade while being elastically contacted with the fixed blade, the paper is sandwiched between the O-ring and the fixed blade, and due to the frictional resistance between the paper and the O-ring, The sheet cutting device according to claim 1 or 2, wherein the rotary blade is rotated via the flywheel. 4. The carriage is stretched around a belt capable of transmitting a driving force of a driving source, and when the driving source is driven, the carriage is pulled through the belt,
The sheet cutting apparatus according to claim 1, wherein the rotary blade is configured to move along the fixed blade. 5. The rotary blade is adapted to elastically contact the fixed blade by an urging force of a coil spring wound around the cutter shaft. Paper cutting device. 6. The method according to any one of claims 1 to 5.
A printer using a paper cutting device, wherein the paper cutting device is provided with a printing device, and the paper printed by the printing device is cut by the paper cutting device.