JP2002205223A - Cutting blade manufacturing method and cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To propose a method of manufacturing a cutting blade having strength, durability and a cutting edge being sharp. SOLUTION: In a press process ST1 for manufacturing a cutting blade, a movable blade blank is blanked from plate material, and an cutting edge is provided through face press work of an end face of the movable blade blank being blanked against an inclined face formed on a press die. Since the cutting edge is press-forged, its strength and durability are enhanced and it can be precisely formed. Residual distortion is eliminated from the movable blade blank provided with the cutting edge, through heat treatment (step ST3). Then, after thickness dispersion is eliminated through surface grinding of both faces (step ST5), camber is provided (step ST6). Since dispersion of spring back, etc., can be suppressed which may be caused by residual distortion and dispersion of thickness after cambering, cambering can be precisely performed. Consequently, the cutting blade which has durability and cuts well can be inexpensively manufactured through simple processes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for cutting sheets such as recording paper, film, cloth, and thin metal plate. More specifically, the present invention relates to a method for manufacturing a cutting blade of such a cutting device.

[0002]

2. Description of the Related Art A conventional cutting device will be described using a cash register as an example. In general, in a printer such as a cash register, printing is performed by a thermal head or the like on a recording sheet fed from a roll sheet having a configuration in which a tape-shaped recording sheet is wound in a roll shape, and the printed recording sheet is cut. It is issued as a receipt or ticket. Various types of printer cutting devices mounted on printers for cutting recording paper are known.

[0003] As such a cutting device for a printer, there is known a system in which a fixed blade and a movable blade are provided, and the recording paper is cut by sliding the blade of the movable blade along the blade of the fixed blade in a point contact state. Have been. This type of cutting device is called a scissor type cutting device.
No. 141595. As disclosed in the publication, a scissor-type cutting device slides a fixed blade and a movable blade in a point contact state. For this reason, both blades are slightly warped such that the center portion is farther apart from the both end portions when viewed in the direction of the blade line.

Further, in the cutting apparatus disclosed in the publication, the recording paper is not completely cut but is partially left uncut so that the cut recording paper piece does not fall on the floor or the like. ing. Since the uncut portion is very small, the printer operator can easily cut the uncut portion only by lightly pulling the recording sheet. Here, in order to leave the uncut portion neatly without being torn, a tip portion of the blade of the movable blade is formed with a thinner tip portion than the other portions.

[0005] Here, the fixed blade and the movable blade of the cutting device having such a configuration are generally manufactured as follows. First, stainless steel (for example, SUS42
Press-cut a plate-like material such as 0J2) to form a cutting blade blank. Next, the cutting blade blank is pressed and warped. After the warping, the cutting blade blank is subjected to a quenching process, and then the barrel is polished. After barrel polishing, after inspecting whether the warpage is formed with high accuracy, by grinding the end surface to a predetermined inclined surface,
Perform blade sharpening. After the cutting, only the tip of the cut end surface is further ground to partially form a thin-walled cutting edge. Thereby, the movable blade of the cutting device for a printer as disclosed in the above-mentioned publication can be obtained.

[0006]

However, the method for manufacturing such a cutting blade has the following problems.

First, in a plate-shaped material from which a cutting blade blank is punched out, the distortion during rolling generally remains as residual distortion, and the thickness also has a predetermined variation. When the cutting blade blank is warped in this state, large springback occurs due to residual strain, and the amount of springback greatly varies due to thickness variation. As a result, it may not be possible to warp with high accuracy. If the warp cannot be accurately formed, the movable blade cannot be slid in a point contact state with the fixed blade, so that the sharpness of the cutting device is reduced and its durability is also reduced.

[0008] Second, even when the cutting blade blank after warping is quenched, the residual distortion of the cutting blade blank,
Due to the variation in the thickness, the variation in the warp may be further increased. For this reason, after the warping, the number of cutting blade blanks that need to be corrected for warpage increases, resulting in poor production efficiency.

[0009] Third, the cutting blade blank is bladed by rotating a formed grindstone (artificial diamond, WA, GC) or a cutter for each sheet. There is a problem that such a cutting work requires a large number of man-hours and increases the equipment cost. Further, there is a disadvantage that it takes a long time to perform the cutting operation. In order to shorten the grinding operation time for cutting, it is conceivable to use a coarse grindstone of about No. 50 to No. 150. However, this is not desirable because the surface roughness of the cutting edge becomes rough, the initial wear of the cutting edge increases, and the durability of the cutting edge decreases.

[0010] Fourth, the cutting edge by the grinding operation cannot increase the strength of the cutting edge beyond the material strength. In some cases, it is necessary to sufficiently reduce the thin cutting edge portion formed at the tip portion. Can not. If a thin blade edge portion cannot be formed at the leading end portion, there is a possibility that the recording paper cannot be cut neatly so that a portion is connected.

[0011] The object of the present invention is to solve the above problems.
An object of the present invention is to propose a method of manufacturing a cutting blade capable of increasing the strength of a cutting edge.

Another object of the present invention is to propose a method of manufacturing a cutting blade capable of accurately performing warping.

It is a further object of the present invention to propose a method of manufacturing a cutting blade which can efficiently perform cutting without relying on grinding.

Still another object of the present invention is to propose a method for manufacturing a cutting blade capable of forming a cutting edge having good sharpness and excellent durability.

On the other hand, an object of the present invention is to propose a cutting blade and a cutting device manufactured by such a new manufacturing method.

[0016]

SUMMARY OF THE INVENTION To solve one or more of the above problems, the present invention provides a recording paper, a film,
A method of manufacturing a cutting blade for cutting a sheet of cloth, sheet metal, or the like, including a pressing step of forming a cutting blade blank by press punching from a sheet metal material. It is characterized in that the blade blank is subjected to face pressing (press forging) by a press die so that the end face of the blade blank has a predetermined inclination angle, and is subjected to blade cutting.

Since the cutting is performed when the cutting blade blank is pressed out of the sheet metal material, the man-hour can be reduced and the manufacturing cost can be reduced as compared with the case where the cutting is performed by grinding which is a separate process. Less is needed. Further, since the blade is formed by press forging using a press die, the material density of the blade edge is increased, the blade edge strength is increased, and a durable cutting blade can be obtained. Furthermore, since the surface roughness of the cutting edge is also improved, a cutting blade with good sharpness and durability can be obtained.

Here, the manufacturing method of the present invention is characterized in that it includes a heat treatment step of performing a heat treatment on the cutting blade blank pressed and cut with the blade.

Further, the manufacturing method of the present invention is characterized in that it includes a step of polishing or grinding both surfaces of the cutting blade blank or one surface on the cutting edge side.

Further, the manufacturing method of the present invention is characterized by including a warping step of pressing the polished or ground cutting blade blank to give a predetermined warp.

As described above, according to the present invention, prior to the warping, the cutting blade blank is heat-treated and polished or ground. By performing the heat treatment before the warping, the residual strain can be removed or reduced, so that the variation in the springback after the warping can be avoided or suppressed. In addition, by grinding or polishing both sides or one side of the cutting edge side before warping, variations in the thickness of the cutting blade blank can be removed, so that an increase in springback after warping due to the thickness variation can be avoided or Can be suppressed. As a result, according to the manufacturing method of the present invention, the warping can be performed with high accuracy.

According to the manufacturing method of the present invention, in order to form a thin blade tip portion at the blade tip portion of the cutting blade, in the pressing step, the tip of the end face of the cutting blade blank to be bladed in the pressing step. It is sufficient to form a cutting edge portion having a smaller thickness than other portions in the same portion by using a press die. Compared to a case where such a thin blade edge portion is formed by grinding, a more durable and sharper blade edge portion can be formed.

Next, the present invention relates to a cutting blade, characterized by being manufactured by the above method.

The present invention is also directed to a scissor-type cutting apparatus for cutting a sheet between the fixed blade and the movable blade while sliding the movable blade in point contact with the fixed blade. One or both are cutting blades manufactured by the above method.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a cutting blade manufactured by the manufacturing method of the present invention and an example of the manufacturing method will be described below with reference to a drawing with reference to a cutting device for a printer.

(Shapes of Fixed Blade and Movable Blade) FIG. 1 is an explanatory view showing a fixed blade and a movable blade of a scissor-type printer cutting device, and the operation thereof. FIG. 2 is a diagram illustrating a movable blade, and FIG. 3 is a diagram illustrating a fixed blade. The printer cutting device 1 is disposed at a discharge portion of a tape-shaped recording paper in a printer such as a cash register (not shown). The fixed blade 2 is fixedly arranged on the side of the device frame in a printer or the like, and the movable blade 3 is centered on its base end portion 4 from the open position (3A) shown in the figure to the closed position (3B) shown by imaginary lines.
Between them. The movable blade 3 has a long hole 5 for sliding a pin, and a pin 6 slidably inserted therein is used to rotate a gear 7 having a side surface attached thereto by a motor (not shown) or the like. Thereby, the movable blade 3 can be rotated.

Here, as can be seen from FIGS. 2 and 3, the mutually facing end faces of the fixed blade 2 and the movable blade 3 are at a predetermined angle (for example, from a plane perpendicular to their left and right surfaces). (Approximately 10 degrees) Inclined blade surfaces 21, 31
It has been. Thereby, one surface 22 of the fixed blade 2 is
The tip edge portion where the cutting edge surface 21 intersects with the cutting edge surface is defined as a cutting edge 23. Similarly, one surface 32 of the movable blade 3 and the cutting edge surface 3
The leading edge portion where 1 intersects is a cutting edge 33.

The fixed blade 2 and the movable blade 3 are arranged so that the contact portions of the blade edges 23 and 33 move from the base end to the distal end in a one-point contact state as the movable blade 3 rotates. It is warped outward. That is, FIG.
3 (b), as shown in FIG. 3 (b), an arc-shaped warp is provided so that the central portions of both are farthest apart.

In addition, in the cutting apparatus 1 of the present embodiment, the fixed blade 2 has a blade edge 23 having a width similar to the width W (10) of the recording paper 10, but the blade edge 33 of the movable blade 3 has The width (width in the blade line direction) is slightly narrower than these. Therefore, the recording paper 10 is left uncut by the width ΔW. As can be seen from FIGS. 3 (a) and 3 (d), the tip of the movable blade 3 in the blade stripe direction is inclined as compared with the other blade edges so that a break or the like is not formed in the uncut portion. Large angle (for example, around 70 degrees)
A blade surface 31a is formed, thereby forming a thinner blade edge portion 33a.

(Manufacturing Method) Next, a method of manufacturing the fixed blade 2 and the movable blade 3 having the above-described configuration will be described with reference to FIGS. Since these manufacturing methods are basically the same, the method of manufacturing the movable blade 3 will be described below, and the description of the method of manufacturing the fixed blade 2 will be omitted.

FIG. 4 is a schematic flowchart showing a manufacturing process, and FIG. 5 is an explanatory diagram showing a characteristic portion in the manufacturing process of this embodiment. Referring to these drawings, first, a metal plate material, for example, a martensite-based plate material having a constant thickness is prepared, and is pressed to form a movable blade 3 and a contour shape. The same movable blade blank is formed (Step ST1 in FIG. 4).

Here, referring to FIG. 5, in the pressing step ST1, the movable blade blank is pressed and punched and the blade is attached to the movable blade blank at the same time. That is, as shown in FIG. 5A, the movable blade 3 is provided on the die plate 41 of the press machine 40.
Inclined surfaces 42 and 42a corresponding to the blade surfaces 31 and 31a are formed.

As shown in FIG. 5B, the punch plate 43 is lowered, and the punch 4
When the plate-shaped material (hoop material) 45 provided on the surface of the die plate 41 is punched by the punch 4, the punched movable blade blank 46 is cut along the inclined surfaces 42 and 42 a on the die plate 41 side while being punched. Press molded. That is, surface pressing is performed. Therefore, the blade surfaces 31, 31a having a predetermined inclination angle are formed on the end surfaces. FIG. 5C shows the movable blade blank 46 obtained by press blanking.

As described above, in the pressing step ST1 of this embodiment, blanking and face pressing are performed simultaneously, and as shown in FIG. 5C, the movable blade having the blade surfaces 31, 31a is attached. A blank 46 is stamped and formed. When the punching operation is completed, the movable blade blank 46 is set in the gap between the die plate 41 and the stripper plate 47.
In the outer peripheral edge portion on the rear end side in the punching direction
6a comes out. The gap amount is desirably 10% or less with respect to the plate thickness of the plate material (hoop material) 45.

A method for processing the movable blade blank 46,
That is, the method of forming the blade surfaces 31 and 31a is the surface pressing (press forging) using the press die as described above.
Therefore, the material density of the blade surfaces 31, 31a can be increased. As a result, the strength of the cutting edges 33 and 33a of the movable blade 3 finally obtained can be increased. In addition, since the surface roughness of the blade surfaces 31 and 31a is also improved as compared with the case of cutting by grinding, the sharpness of the finally obtained blade edges 33 and 33a of the movable blade 3 can be improved, and ,
Its durability can be improved.

In addition to this, the precision of the blade surfaces 31 and 31a is determined by the inclined surface (mold surface) 4 formed on the die plate 41.
Since the accuracy of such a mold generally depends on the accuracy of the molds 42 and 42a, it is easy to accurately perform the cutting of the movable blade.

Further, as described above, the thin blade edge portion 33a formed at the distal end portion of the movable blade 3 is also formed at the same time in the pressing step. It is possible to perform the blade cutting more efficiently than in the case of forming 33a.

Referring to FIG. 4 again, the movable blade blank 46 pushed out in the state of being bladed as described above is subjected to a washing step, after oil and the like are washed (step ST2). Heat treatment is performed (step ST
3). In the heat treatment step ST3, residual distortion and the like of the movable blade blank 46 are removed by quenching and annealing. After this, barrel polishing (step ST4) is performed,
Small burrs attached to the movable blade blank 46 and dirt attached to the surface are removed. In addition, the movable blade blank 46
Attach the edge of the.

Thereafter, both sides 4 of the movable blade blank 46
7 and 48 are ground (step ST5, FIG.
(C), (d)). By this double-sided surface grinding, the burrs 46a remaining in the pressing step ST1 remaining on the movable blade bun rack 46 are removed. In addition, movable blade blank 4
6 is finished to have a uniform thickness as a whole, and variations in thickness are also eliminated. As a result, the movable blade blank 46A having a uniform thickness and no burrs is obtained from the movable blade blank 46 having burrs and having a variable thickness as shown in FIG. 5C.

The movable blade blank 46A after the residual strain is removed by the heat treatment and the thickness variation is removed by the double-sided surface grinding is warped by a press (step ST6 in FIG. 4). Due to the warping, the movable blade blank 46A has a shape in which the central portion is warped in the out-of-plane direction as shown in FIG.

Here, in this example, the residual distortion is removed,
Since variations in thickness are also eliminated, variations in springback due to warping are suppressed, and the amount of springback is small. Therefore, warping can be performed with high accuracy.

The movable blade 3 is obtained by warping the movable blade blank 46A in this manner. The movable blade 3 after warping is inspected for warpage or the like (FIG. 4).
Step ST7), the surface dirt and the like are cleaned (step ST8).

Note that the present invention is not limited to the above-described embodiment, and various changes can be made.

For example, in the pressing step of punching a cutting blade blank, the inclined surface corresponding to the blade surface is cut by blanking simultaneously with the blanking, and the inclined surface is pressed after the blank is removed. The blanking process may be performed, and blanking may be performed after the inclined surface is face-pressed.

Although the embodiment in which both surfaces are ground has been described, it is also possible to grind only the surface on the side of the blade edge for forming the blade edge. In this case, it is effective when the warping step is unnecessary.

Further, the grinding step has been described. However, when the cutting amount for forming the cutting edge is small, polishing may be performed.

Furthermore, although the quenching step has been described, the quenching step may be omitted depending on the specifications required for the cutting blade and the material of the cutting blade.

Furthermore, although the description has been made using a straight cutting blade, a saw blade may be used. Rather, in this case, only one surface is polished or ground. Can be formed at the same time, so that the effect is remarkable.

Although the present invention has been described using a cutting blade for a printer, the present invention is not limited to this, and it is needless to say that the present invention can be applied to all cutting blades having a sloping surface for cutting.

[0050]

As described above, according to the method for manufacturing a cutting blade of the present invention, in the pressing step of punching a cutting blade blank from a plate-shaped material, a cutting edge is formed on the cutting blade on the side of the press die. An inclined surface corresponding to the blade surface is formed, and the blade is cut by face pressing at the same time as blanking.

Therefore, according to the present invention, as compared with the case where the blade is formed by grinding, the blade can be formed easily and in a short time, and the cost can be reduced. In addition to this, the formed blade surface is in a press-forged state, so that a high-strength and durable blade edge can be formed. Furthermore, since the surface roughness of the blade surface can be increased and the blade edge can be formed with high accuracy, a sharp cutting blade can be manufactured.

Further, in the manufacturing method of the present invention, the cutting blade blank is subjected to a heat treatment to remove the residual strain, and the both surfaces thereof are ground to remove the variation in thickness. I am trying to attach it. Therefore, it is possible to avoid or suppress the increase and the variation of the springback due to the residual strain and the variation of the thickness, and it is possible to accurately warp the cutting blade. As a result, since the movable blade and the fixed blade can be engaged with each other in an appropriate state, a sharp cutting blade can be manufactured.

Further, even when a thin blade portion is formed at the tip of the blade edge of the cutting blade, it can be formed at the same time in the pressing step, and therefore, compared to a case where such a blade portion is formed by grinding. Good production efficiency.

As described above, according to the manufacturing method of the present invention, a cutting step by grinding is not required, so that the cutting blade can be manufactured efficiently and at low cost.

[Brief description of the drawings]

FIG. 1A is an explanatory view of a main part showing a cutting device having a fixed blade and a movable blade manufactured by a manufacturing method of the present invention, and FIGS. 1B and 1C are explanatory views showing the operation thereof. It is.

2A is a perspective view showing the fixed blade of FIG. 1, FIG. 2B is an explanatory view showing a warped state, and FIG. 2C is a partial sectional view showing a sectional shape of the blade tip.

3A is a perspective view showing the movable blade of FIG. 1, FIG. 3B is an explanatory view showing a warped state, FIG. 3C is a partial cross-sectional view showing a cross-sectional shape of a blade edge portion, and FIG. FIG. 4 is a partial cross-sectional view showing a cross-sectional shape of a blade edge portion formed at a tip.

FIG. 4 is a flowchart showing a manufacturing process of the movable blade of FIG. 3;

5 (a) to 5 (c) are press steps ST1 in FIG.
FIG. 5D is an explanatory view showing the processing in the double-sided surface grinding step ST5 of FIG. 4.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting device 2 Fixed blade 21 Blade surface 22 Surface 23 Blade 3 Movable blade 31 Blade surface 31a Blade surface part formed in the tip part 32 Surface 33 Blade tip 33a Blade part formed in the tip part ST1 Pressing process ST2 Cleaning process ST3 Heat treatment process ST4 Barrel polishing process ST5 Double-sided surface grinding process ST6 Warp process ST7 Inspection process ST8 Cleaning process

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideto Kosaka 3-5-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Corporation (72) Inventor Takayuki Hayade 610 Nagachi Gosho, Okaya City, Nagano Prefecture Sode Nagano Corporation

Claims (7)

[Claims] 1. A method for manufacturing a cutting blade used for cutting a sheet, comprising: a pressing step of forming a cutting blade blank by press punching from a sheet metal material; A method for manufacturing a cutting blade, characterized in that a press die is used to perform face pressing and perform blade cutting so that an end surface of the cutting blade has a predetermined inclination angle. 2. The method for manufacturing a cutting blade according to claim 1, further comprising a heat treatment step of performing a heat treatment on the cutting blade blank that has been press-cut with a blade. 3. The method for manufacturing a cutting blade according to claim 1, further comprising a step of polishing or grinding both surfaces or one surface on a tooth tip side of the cutting blade blank. 4. The method for manufacturing a cutting blade according to claim 3, further comprising a warping step of pressing the cutting blade blank after polishing or grinding the both surfaces or the one surface to apply a predetermined warp. . 5. The cutting step according to claim 1, wherein, in the pressing step, a tip portion of an end face of the cutting blade blank to be bladed is thinner than another portion. A method of manufacturing a cutting blade. 6. A cutting blade manufactured by the method according to claim 1. 7. A scissor-type cutting device for cutting a sheet between the fixed blade and a movable blade while sliding the movable blade in a point-contact state, wherein one or both of the fixed blade and the movable blade are provided. 7. A cutting device according to claim 6, wherein each of the cutting devices is a cutting device.