JP3767792B2 - Paper cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper cutting device that moves a movable blade along a cutting edge of a fixed blade arranged in the width direction of the printing paper and cuts the printing paper, and is applied to, for example, a printing paper cutting device used in a printer. And useful technology.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a printing apparatus such as a thermal printer that prints on continuous paper may be integrally provided with a paper cutting device that cuts paper after printing by the printer. As a paper cutting device in such a printing apparatus, for example, as shown in FIG. 9, a fixed blade 11 extending in the width direction of the printing paper and a movable blade 21 are provided along the extending direction of the fixed blade 11. And a movable carriage, and a paper cutting device for cutting a printing paper sandwiched between the fixed blade and the movable blade by moving the blade edge of the movable blade in sliding contact with the blade edge of the fixed blade by the carriage It has been known.
[0003]
The paper cutting device shown in FIG. 9 has a fixed blade 11 arranged in the width direction of the printing paper, and a carriage 20 that holds a disc-shaped movable blade 21 on a guide portion 12 and a feed screw 33 that extend in parallel with the fixed blade. Is attached slidably to the rotating shaft of the movable blade 21, and a friction roller 23 that is in contact with the side surface of the fixed blade 11 is integrally provided, and the feed screw 30 is rotated to move the carriage 20 along the guide 12. When the blade 21 and the friction roller 23 move, and the outer periphery of the friction roller 23 rolls on the side surface of the fixed blade 11, the movable blade 21 is rotated at the same time, and the blade edge slides on the blade edge of the fixed blade 11 for printing. The printing paper is moved in the width direction of the paper and cuts the printing paper sandwiched between the fixed blade 11 and the movable blade 21.
[0004]
[Problems to be solved by the invention]
The conventional paper cutting device shown in FIG. 9 has a long and narrow slit S through which a printing paper is inserted along the width direction of the paper to be transferred, and a fixed blade so that the blade edge is positioned on one inner surface of the slit S. 11 is disposed, and an opening E on which the movable blade 21 faces is formed on the surface of the slit S opposite to the inner surface, and the cutting edge of the movable blade 21 moves in the opening E. The reason for adopting such a configuration is that the movable blade 21 is moved by the carriage 20, and if the carriage 20 is provided on the same side as the fixed blade 11, the carriage interferes with the paper. However, in the cutting apparatus as shown in FIG. 9 having the slits S that the front ends of the fixed blade 11 and the movable blade 21 face, when the paper is set, the front end of the paper must be inserted into the narrow slit S. Therefore, there is a problem that handling is troublesome.
[0005]
Therefore, a free-set type paper cutting device as shown in FIG. 10 was examined in which a slit that needs to be inserted through the front end of the paper when setting the paper is unnecessary. In this apparatus, the carriage 20 includes a transfer body portion 20A that engages with the feed screw 33 and a holder portion 20B that holds the movable blade 21, and the holder portion and the transfer body portion are opposite to each other with the fixed blade 11 interposed therebetween. It is comprised so that it may be located in.
[0006]
However, the cutting apparatus shown in FIG. 10 has a problem that the paper after cutting falls into a position that does not enter the space SS and does not hinder the movement of the carriage except when the movable blade 21 is in a horizontal posture. However, when the apparatus is arranged with the movable blade 21 in a nearly horizontal posture as shown in FIG. 8, the cut sheet P falls into the space SS behind the fixed blade 11, so immediately after cutting. If the cut paper is not removed, the connecting portion 20C between the carriage holder 20B and the transfer body 20A will catch the cut paper when the carriage 20 moves next time, and the edges of the paper will be wrinkled. If the paper is cut, the entire paper will be crumpled.In the worst case, the crumpled paper may prevent the carriage from moving so that it cannot be cut. That there is a problem that has become clear.
[0007]
The present invention has been devised to solve the above-described problem, and does not require a fixed blade that must be inserted through the leading edge of the paper when setting the paper and a slit that faces the leading edge of the movable blade, and is movable. Even if the device is placed with the blades close to horizontal and the cut paper is not removed after cutting, the carriage connection part will catch the cut paper when the carriage moves next time, It is an object of the present invention to provide a free-set type paper cutting device that does not cause wrinkles.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a fixed blade extending in the width direction of a printing paper, a carriage capable of reciprocating in the extending direction of the fixed blade, and a fixed blade mounted on the carriage. A movable blade movable along the blade edge; and a frame to which the carriage transfer means is attached, and the blade edge of the movable blade is moved in the width direction of the printing paper while being in sliding contact with the blade edge of the fixed blade. In the paper cutting device for cutting the printing paper sandwiched between the fixed blade and the movable blade, a storage space for storing the cut printing paper is provided between the fixed blade and the frame. The storage space is provided with a drop-preventing member that prevents the printing paper from dropping after cutting, and the carriage moves the carriage to the frame side with the fixed blade interposed therebetween. And a holder having the movable blade on the opposite side of the frame, and a recess into which the printing paper moved to the storage space side when the carriage moves can be formed. It is a thing.
[0009]
Thus, the paper when loading paper tip fixed blade and the movable blade facing slits must Yara is inserted becomes unnecessary, moreover movable blade pre-cut after cutting is arranged a device with a nearly horizontal attitude Even if the paper is not removed, the next time the carriage moves, the carriage connecting part will catch the cut paper and wrinkle the paper, or the crumpled paper will prevent the carriage from moving and the paper will not be cut. Can be prevented.
[0010]
Preferably, the sheet drop prevention member is made of an elastic material having a degree of flexibility that does not hinder movement of the carriage. Thus, the sheet can be cut without increasing the driving force of a motor or the like that moves the carriage, and the size of the apparatus can be avoided.
[0011]
Alternatively, the paper drop prevention member may be a rigid thin plate that is urged by an elastic body so as to protrude into the storage space. This can reduce deterioration due to contact with the carriage and increase durability.
[0012]
Further, it is preferable that the number of pieces protruding into the storage space of the paper drop prevention member is at least two or more. By setting the number of pieces protruding into the storage space to be at least 2 or more, the paper accumulated in the storage space after cutting can be held in a stable posture, and the possibility of being caught by the carriage can be reduced.
[0013]
Further, the movable blade is constituted by a disk-shaped round blade, and is rotatably supported by the holder portion of the carriage, and a shaft that supports the round blade is in contact with a side surface of the fixed blade. A friction roller is attached, and when the carriage is moved, the friction roller rolls so that the movable blade rotates and moves along the blade edge of the fixed blade to cut the paper. desirable. By configuring the movable blade with a disk-shaped round blade, durability can be enhanced.
[0014]
In the paper cutting device of the present invention, when the device is used, the fixed blade is in a vertical state, and the movable blade is rotatably supported on a horizontal plane substantially perpendicular to the fixed blade. It is particularly effective. If the fixed blade and the movable blade are arranged in the above-described posture, the cut sheet is likely to fall into a position where it interferes with the carriage. However, according to the present invention, the sheet fall prevention member prevents the carriage from moving. Thus, it becomes possible to prevent interference between the cut sheet and the carriage.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
[0016]
FIG. 1 is a perspective view of a first embodiment of a paper cutting device for a printer (hereinafter simply referred to as a cutter) to which the present invention is applied, and FIG. 2 is a perspective view showing a state in which a fixed blade of the cutter is removed. 3 is a perspective view showing a state in which the frame of the cutter is removed.
[0017]
In the cutter according to the present embodiment, an L-shaped fixed blade 11 is fixed to the lower surface of the base member 10 with a screw or the like so that the blade portion 11 a has an appropriate distance from the front end surface of the base member 10. Then, a carriage 20 having a concave portion that can be engaged with a movable blade and a blade portion 11a of the fixed blade 11 described later is engaged with the blade portion 11a of the fixed blade 11 as shown in FIG. It is attached so as to be movable along the part 11a. A frame 13 is mounted on the upper surface of the base member 10 with an appropriate interval so as to form a space in which the carriage 20 can move (see FIGS. 1 and 2). Inside the frame 13, as will be described later, a feed screw (described later) for engaging with a guide hole 20a of the carriage 20 and transferring the carriage 20 is held in parallel with the blade portion 11a of the fixed blade 11. It is comprised so that. Further, although not particularly limited, the frame 13 is formed with an eaves portion 13a that covers the carriage 20 and makes it difficult to see from the outside when the carriage 20 is at the home position (standby position).
[0018]
As shown in FIG. 3, the carriage 20 includes a transfer body portion 20A in which the guide hole 20a is formed and a holder portion 20B for holding a movable blade. The blade portion 11a of the fixed blade 11 is placed on the holder portion 20B. Is formed from the lower side, and a second concave portion 20c is formed on the connecting portion between the transfer body portion 20A and the holder portion 20B from the opposite side of the concave portion 20b, that is, from the upper side. . In the cutter according to the present embodiment, the recess 20c of the carriage 20 constitutes a storage recess into which the cut sheet can enter. Further, a first taper portion 20e for guiding the cut sheet to the concave portion 20c is provided on the upper portion of the standing wall 20d forming the concave portion 20c of the carriage 20, and the standing wall 20d is provided with the above-mentioned standing wall 20d. A second taper portion 20f that guides the cut paper accumulated in the space behind the blade portion 11a of the fixed blade 11 toward the concave portion 20c when sliding in contact with the back surface of the blade portion 11a of the fixed blade 11. Is provided at the lower part of the standing wall 20d.
[0019]
In the cutter according to the present embodiment, a plurality (four in this case) of projecting pieces 31a, 31b, and 31c projecting toward the gap between the back surface of the blade portion 11a of the fixed blade 11 and the front end surface of the base member 10. , 31d are provided. In the present embodiment, the protruding pieces 31a, 31b, 31c, and 31d are formed of a thin film material having elasticity and flexibility such as a plastic film, and are pressed by the side surface of the carriage when the carriage 20 moves. Thus, it is configured so as not to be deformed and prevent movement of the carriage 20. Further, these projecting pieces 31 a to 31 d are set so that the height thereof is the same as or slightly higher than the bottom surface of the recess 20 c of the carriage 20.
[0020]
As a result, the cut sheet enters the recess 20c of the carriage 20, and when the carriage 20 returns to the standby position after the end of cutting, the protruding pieces 31a to 31d replace the recess 20c of the carriage 20 at the upper edge of the tip. Support the paper. Then, when the carriage 20 moves again for the next sheet cutting, the protruding pieces 31a to 31d are pushed backward, so that the cut sheets supported by the protruding pieces 31a to 31d enter the recess 20c of the carriage 20. Will be held in.
[0021]
By repeating the above operation, the cutter according to the present embodiment can store the cut sheets in the space behind the blade portion 11a of the fixed blade 11, and the collected sheets and the carriage 20 interfere with each other to form the sheets. There is no risk of being caught. In addition, although what was formed so that it may have the same height from a base end part to a front-end | tip part as a protrusion piece 31a-31d is shown by drawing, the front-end | tip of protrusion piece 31a-31d becomes a little low. By forming the taper, that is, the relief portion in this way, it is possible to prevent the protruding pieces 31a to 31d from interfering with the lower end of the sheet when the carriage 20 passes after the carriage 20 passes.
[0022]
Next, a more specific configuration of the protruding pieces 31a to 31d will be described with reference to FIG. FIG. 4 is a perspective view showing a state in which the fixed blade 11 of the cutter according to this embodiment is removed as viewed from below.
[0023]
As shown in FIG. 4, in the present embodiment, three recesses 10 </ b> A, 10 </ b> B, and 10 </ b> C that house the protruding pieces 31 a to 31 d are formed on the back surface of the base member 10, and two of these recesses 10 </ b> A and 10 </ b> B are formed. The protruding pieces 31a to 31d are housed inside. The remaining one concave portion 10C is a spare concave portion for sufficiently supporting the cut paper even when, for example, a thin paper with a low thickness is used. Although each protrusion piece 31a-31d is not necessarily limited, two are made into one set, and it is formed so that the U-shape may be made as a whole, and the connection part is in said recessed part 10A, 10B, 10C. Are attached to the base member 10 by being engaged with corresponding ones of the locking pieces 14a, 14b, 14c having an inverted L shape provided on the base member 10, and the fixed blade 11 is joined to the back surface of the base member 10. It is configured so that it can be prevented from coming off by fixing with a screw or the like.
[0024]
In the embodiment of FIG. 4, the U-shaped members constituting the projecting pieces 31a to 31d are shown with their connecting portions locked to the locking pieces 14a and 14b and fixed. Contrary to FIG. 4, the U-shaped members constituting the projecting pieces 31a to 31d may be configured such that the tip portions are fixed to both sides of the locking pieces 14a and 14b and the connecting portions are projected. . Even in this configuration, since the U-shaped members constituting the projecting pieces 31a to 31d are made of a film having elasticity and flexibility, they are easily deformed when the carriage 20 moves. The movement of the carriage 20 is not hindered, and the carriage 20 can be returned to the original state after passing, and the cut sheet can be held so as not to fall.
[0025]
In FIG. 4, 15a and 15b are positioning pins for attaching the fixed blade 11, and 16 is a cover member attached so as to cover a part of the base member 10 from one side of the frame 13 to the rear part. A housing portion 16a in which a motor as a drive source for rotationally driving the feed screw is provided between the cover member 16 and the frame, and a gear transmission for reducing and transmitting the rotational driving force of the motor to the feed screw. A housing portion 16b in which the mechanism is incorporated is provided. Reference numerals 19a and 19b denote through holes through which fixing screws for attaching the cutter to the printer are inserted.
[0026]
Next, a more specific configuration of the carriage 20 will be described with reference to a cross-sectional view of the main part of FIG. In FIG. 5, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.
[0027]
A disc-shaped movable blade 21 is rotatably attached to the holder portion 20B of the carriage 20 of the present embodiment by a support shaft 22 so as to contact the cutting edge 11a of the fixed blade 11. A friction roller 23 made of rubber or the like is fixed so as to be positioned below the movable blade 21 and contact the front surface of the fixed blade 11. Accordingly, when the carriage 20 is moved along the fixed blade 11 by the feed screw, the movable blade 21 and the friction roller 23 move, and at this time, the outer periphery of the friction roller 23 rolls on the front surface of the fixed blade 11 to move. The blade 21 is rotated in conjunction with it, and the blade edge is moved while being in sliding contact with the blade edge 11a of the fixed blade 11 so as to cut the printing paper sandwiched between the fixed blade 11 and the movable blade 21.
[0028]
On the other hand, the transfer body portion 20A of the carriage 20 is provided with an engagement pin 24 protruding into the guide hole 20a, and the tip of the engagement pin 24 is formed on the outer periphery of the feed screw 33. By being engaged with the groove, when the feed screw 33 is rotated, the engagement pin 24 is relatively moved along the spiral groove, whereby the carriage 20 is moved along the feed screw 33. Yes.
[0029]
6 and 7 show a second embodiment of the cutter according to the present invention. 6 is a perspective view showing a state where the fixed blade of the cutter is removed, and FIG. 7 is a perspective view showing a state where the fixed blade 11 of the cutter is removed as viewed from below. 6 and 7, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description is omitted.
[0030]
The cutter according to the second embodiment has a slightly wide protruding piece 31a ′ to 31c ′ made of an elastic material such as rubber or sponge instead of the film-like protruding pieces 31a to 31d in the cutter of the first embodiment. Intrusion prevention member 31 is mounted in a recess formed on the lower surface of base member 10. Other configurations are substantially the same as those of the first embodiment. Also in the cutter according to the second embodiment, the cut paper enters the concave portion 20c of the carriage 20, and when the carriage 20 returns to the standby position after completion of cutting, the protruding pieces 31a ′ to 31 are replaced with the concave portion 20c of the carriage 20. 31c 'supports the paper at its upper end. Then, when the carriage 20 moves again for cutting the next sheet, the protruding pieces 31 a ′ to 31 c ′ are pushed backward, so that the cut sheets supported by the protruding pieces 31 a ′ to 31 c ′ are removed from the carriage 20. The recess 20c enters and is held. By repeating the above operation, a certain amount of cut sheets can be stored in the space behind the blade portion 11a of the fixed blade 11 even in the cutter according to the present embodiment. Can avoid wrinkling the paper due to interference.
[0031]
Next, a schematic configuration of a printing apparatus (printer) 40 to which the cutter 100 according to the present invention is attached and a relationship between the printer and the cutter will be described with reference to FIG. Here, a case where the cutter of the present invention is attached to a thermal line printer will be described as an example.
[0032]
In FIG. 8, 41 is a main body case of the thermal line printer 40, 42 is a thermal head in which a plurality of heating resistors are arranged in a line with a length corresponding to the printing width, and 43 is opposed to the thermal head 42. The platen roller 43 also serves as a conveying device provided. The platen roller 43 is rotatably attached to the end of a holding plate 45 that is rotatably provided with a support shaft 44 as a fulcrum. The thermal head 42 is pressed toward the platen roller 43 by a spring 47. Reference numeral 50 denotes roll paper stored in the storage case 60, and the leading end of the paper P drawn from the roll paper 50 passes between the thermal head 42 and the platen roller 43 and is attached to the upper surface of the printer 40. The cutter 100 according to the present invention is set so as to contact the front surface of the fixed blade 11 of the cutter 100. Reference numeral 48 denotes a drive motor. The rotation of the motor is transmitted to the platen roller 43 by a gear transmission mechanism (not shown) provided on the side of the main body case 41.
[0033]
In the apparatus of FIG. 8, the roll paper 50 is loaded with the storage plate 60 opened by rotating the tip of the holding plate 45 in the direction of arrow R, and the paper is drawn out from the roll paper 50 and placed on the thermal head 42. The sheet can be set simply by turning the holding plate 45 in the direction opposite to the R direction and returning it to the original position after setting the leading end of the sheet to be higher than the cutting edge of the fixed blade 11 of the cutter. . That is, it is possible to easily set the paper without the trouble of inserting the leading edge of the paper into the slit S like the cutter of FIG.
[0034]
In the above-described embodiment, the present invention is applied to a cutter that cuts a sheet by moving the round blade, that is, the disc-shaped movable blade 21 in the width direction of the sheet along the tip of the fixed blade 11 while rotating. However, the present invention is not limited to this, and instead of a round blade, a straight blade or the like having an oblique blade portion is used in the width direction of the paper along the tip of the fixed blade 11 by a carriage. The present invention can also be applied to a cutter having a configuration for cutting a sheet by moving it. However, in the case of a round blade, since the printing paper is cut along the entire periphery, the blade wear becomes uniform, which is advantageous in extending the useful life of the cutter. The fixed blade 11 is formed in an L shape in the above embodiment, but may be a flat plate-shaped straight blade.
[0035]
In the above-described embodiment, four or three protruding pieces 31 for supporting the cut paper have been provided. However, the number of protruding pieces is not limited thereto, and may be one. However, five or more may be provided. In the embodiment, the protruding piece 31 that supports the cut paper is made of an elastic material such as a plastic film or rubber, but the base side fixed to the base member 10 is engaged via an elastic body such as a leaf spring. It may be a thin plate having rigidity that is biased so that the front end side protrudes into a gap (paper storage space) at the back of the fixed blade 11. Furthermore, in the above-described embodiment, the protruding piece 31 is arranged horizontally, that is, in parallel with the base member 10, but the cut paper is supported so as to protrude from the lower side into the gap (paper storage space) on the back of the fixed blade 11. A protruding piece 31 may be provided.
[0036]
In the above-described embodiment, the method using the feed screw is described as the mechanism for moving the carriage that holds the movable blade. However, the carriage is moved by another feed mechanism using a wire or a belt. Also good.
[0037]
Furthermore, as an application example of the cutter to which the present invention is applied, the case where it is used in a thermal line printer has been described. However, the present invention is not limited to this, and a serial thermal printer that moves the print head in the paper width direction, or a sensitive microcapsule. It is also possible to apply to a color printer using a printer paper coated with the ink, an inkjet serial printer, or the like.
[0038]
【The invention's effect】
As described above, the paper cutting device according to the present invention does not require a fixed blade and a slit facing the movable blade that must be inserted through the leading edge of the paper when setting the paper, so that the paper can be easily set. Even if the device is arranged in such a posture that the fixed blade and the movable blade are horizontal, and the cut paper is not removed after cutting, the connecting portion of the carriage will be cut when the carriage moves next time. There is an effect that there is no risk of wrinkling the paper by hooking the used paper.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cutter according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a state where a fixed blade of the cutter in FIG. 1 is removed.
3 is a perspective view showing a state where a frame of the cutter of FIG. 1 is removed. FIG.
4 is a perspective view showing a state in which the fixed blade of the cutter according to the embodiment of FIG. 1 is removed as viewed from below. FIG.
FIG. 5 is a cross-sectional view of a main part showing a more specific configuration of the carriage.
FIG. 6 is a perspective view showing a state in which a fixed blade of a cutter according to a second embodiment of the present invention is removed.
7 is a perspective view showing a state in which the fixed blade of the cutter in FIG. 6 is removed when viewed from below. FIG.
FIG. 8 is a cross-sectional explanatory view showing a schematic configuration of a printing apparatus (printer) to which a cutter according to the present invention is attached and a relationship between the printer and the cutter.
FIG. 9 is a cross-sectional configuration diagram illustrating an example of a conventional cutter.
FIG. 10 is an explanatory cross-sectional view of a main part showing a schematic configuration of a free set type cutter studied prior to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Base member 11 Fixed blade 13 Frame 20 Carriage 20A Transfer body part 20B Holder part 21 Movable blade 23 Friction roller 31a-31d Projection piece (paper fall prevention member)
40 Printing device (printer)
42 Thermal Line Head 43 Platen Roller 100 Paper Cutting Device (Cutter)

Claims (6)

A fixed blade extending in the width direction of the printing paper, a carriage reciprocally movable in the extending direction of the fixed blade, a movable blade mounted on the carriage and movable along a cutting edge of the fixed blade, A frame to which a carriage transfer means is attached, and is sandwiched between the fixed blade and the movable blade by moving the blade edge of the movable blade in the width direction of the printing paper while being in sliding contact with the blade edge of the fixed blade. A paper cutting device for cutting printing paper,
Between the fixed blade and the frame, there is provided a storage space in which the cut printing paper can be stored, and the storage space is provided with a drop-preventing member for preventing the printing paper from being cut off. ,
The carriage is formed with a transfer body portion related to a feed mechanism for transferring the carriage to the frame side with the fixed blade interposed therebetween, and a holder portion having the movable blade on the opposite side of the frame. A paper cutting device in which a storage concave portion into which the printing paper moved to the storage space side when the carriage moves is formed is formed. 2. The paper cutting device according to claim 1, wherein the paper drop prevention member is made of an elastic material having flexibility that does not hinder movement of the carriage. The paper cutting device according to claim 1, wherein the paper drop prevention member is a rigid thin plate biased so as to protrude into the storage space by an elastic body. The paper cutting device according to any one of claims 1 to 3, wherein the number of pieces protruding into the storage space of the paper drop prevention member is at least two or more. The movable blade is formed of a disk-shaped round blade, and is rotatably supported by a holder portion of the carriage, and a friction roller that abuts a side surface of the fixed blade is supported on a shaft that supports the round blade. When the carriage is moved, the friction roller rolls so that the movable blade rotates and moves along the cutting edge of the fixed blade to cut the paper. The paper cutting device according to any one of claims 1 to 4. 6. The paper according to claim 5, wherein when the apparatus is used, the fixed blade is in a vertical state, and the movable blade is rotatably supported on a horizontal plane substantially perpendicular to the fixed blade. Cutting device.

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