WO2012121228A1

WO2012121228A1 - Rotary cutting blade for cutting sheet material, method for manufacturing rotary cutting blade, and rotary cutter using rotary cutting blade

Info

Publication number: WO2012121228A1
Application number: PCT/JP2012/055608
Authority: WO
Inventors: 冨永　修; 順一中尾; 田中　道男; 清治田中
Original assignee: 株式会社日立メタルプレシジョン; 日立金属株式会社
Priority date: 2011-03-08
Filing date: 2012-03-06
Publication date: 2012-09-13
Also published as: CN103429402B; JPWO2012121228A1; CN103429402A; JP6006198B2

Abstract

Provided are: a compact and low cost rotary cutting blade configured so that the shank has satisfactory mechanical strength and so that the radius of the rotational path circle of the cutting edge is small; a method for manufacturing the rotary cutting blade; and a compact and low cost rotary cutter using the rotary cutting blade. A rotary cutting blade for cutting a sheet material is configured by spirally mounting a band-shaped material, which serves as the cutting edge, to the longitudinal outer peripheral surface of the shank at a predetermined twist angle. In the above configuration, the band-shaped material can be formed into the spiral cutting edge by inserting the band-shaped material into a spiral groove formed in the outer peripheral surface of the shank, or can be formed into the spiral cutting edge by inserting the band-shaped material into a spiral groove having a constant twist angle, or can be formed into the spiral cutting edge by forming the band-shaped material in advance into a shape having a twist angle same as the twist angle of the spiral groove, or can be formed into the spiral cutting edge by forming the band-shaped material in advance into a shape which is spiral and, at the same time, is bent relative to the width direction so that the shape corresponds to the shape of the bottom of the spiral groove. A rotary cutter is obtained using the rotary cutting blade. In the rotary cutter, the rectilinear edge line of a stationary cutting edge sequentially engages with the rotary cutting blade at a predetermined shearing angle.

Description

Rotary blade for cutting sheet material, manufacturing method thereof, and rotary cutter using the same

The present invention relates to a sheet material for cutting various sheet materials such as strips and rolls of paper and films, seals and labels into arbitrary lengths in various devices such as office machines such as copying machines and printers and ticket machines. The present invention relates to a cutting rotary blade, a manufacturing method thereof, and a rotary cutter using the same.

Conventionally, for the purpose of cutting a sheet material to an arbitrary length, a rotary cutter of a type in which a sheet material is inserted and cut between a rotating rotary blade and a fixed blade is used. For example, in the rotary cutter disclosed in Patent Document 1, rotary blades are arranged so as to sequentially mesh with each other along a cutting direction while rotating with a constant shear angle with respect to a fixed blade having a linear cutting edge line. . In the rotary blade, a cutting edge and a shank having a substantially circular cross-sectional shape perpendicular to the rotation axis are cut and formed as a single piece from a single metal material.

Further, for example, in the rotary cutter disclosed in Patent Document 2, in the rotary blade, a rectangular or flat plate having a rectangular cross section that is wide and thick in the blade height direction is a longitudinal direction with respect to the outer peripheral surface of the cylindrical shank. The cutting edge line is arranged in a straight line by being inserted into a straight groove provided so as to extend.

In addition to the above-mentioned

Patent Documents

1 and 2, Non-Patent Document 1 discloses a commercially available rotary cutter (685.56 Cutter D). The rotary blade used in the rotary cutter appears to be formed by wedged square bars, which are considered to be square wire rods having a thickness and width at the cutting edge.

In general, in a rotary cutter, if the mechanical strength of the shank that constitutes the rotary blade is insufficient, the shank bends due to the cutting reaction force received during cutting, and the cutting edge moves away from the mating blade in accordance with the amount of bending of the shank. It will move. If this phenomenon occurs, the shear angle on the cutting end side between the rotary blade and the mating blade is relatively decreased, and the cutting reaction force is further increased. In particular, the mechanical strength of the shank tends to be insufficient when the diameter of the rotational locus of the rotary blade is reduced for the purpose of reducing cutting torque or reducing the size.

It is considered that the problem of shank deflection in such a rotary blade is solved in Patent Document 1 by cutting and forming the blade tip as an integral part of the shank. Further, in Patent Document 2, a plate member having a thick rectangular cross section is applied to the blade member, and in the commercially available rotary blade disclosed in Non-Patent Document 1, the blade member is hard and has a rectangular cross section having a thickness and a width. It is thought that each problem is solved by applying a high-rigidity square bar and then increasing the diameter of the shank accordingly.

US Pat. No. 5,0019,531 JP 09-323292 A

In order to achieve a compact and inexpensive rotary cutter that leads to the realization of a compact and inexpensive rotary cutter, the present inventors should reduce the diameter of the rotation locus circle of the blade tip while ensuring the mechanical strength of the shank. The configurations of the rotary blades disclosed in

Patent Documents

1 and 2 described above and the commercially available rotary blades disclosed in Non-Patent Document 1 were examined.

The rotary blade disclosed in Patent Document 1 has a high mechanical strength against a radial bending load that acts during cutting because the shank and the cutting edge are formed as an integral body, and by means such as a reduction in the diameter of the rotation locus circle of the cutting edge. The configuration is easy to make compact. However, since the shank and cutting edge with a complicated cross-sectional shape are cut out from a single metal material, the manufacturing cost of the rotary blade increases due to high material costs, low material yield, and increased machining time. There was a disadvantage that led to

Further, the configuration of the rotary blade disclosed in Patent Document 2 has advantages such as the simplicity of the shape of the blade member and the shank member and the degree of freedom in combining the materials. Therefore, this configuration is suitable for reducing the manufacturing cost in terms of material cost, material yield, processing time, and the like. However, in the configuration in which the cutting edge is linear, it is necessary to increase the diameter of the shank in order to ensure a large shear angle advantageous for cutting. On the other hand, when the diameter of the shank is reduced in order to obtain a more compact rotary blade, the above-described bending of the shank becomes a problem.

Also, a commercially available rotary blade disclosed in Non-Patent Document 1 was actually obtained and examined. The appearance is shown in FIG. 8A shows a cross section taken along line segment R1R1 corresponding to the cutting start side, and FIG. 8B shows a cross section taken along line segment R2R2 corresponding to the cut end side. The rotary blade 51 has advantages such as low material cost and good material yield due to its configuration. However, the cutting edge 52 is made of a square wire having a rectangular cross section having a thickness and a width. In general, a square wire is hard and highly rigid. Therefore, it seems that the operation | work which inserts a square wire in the spiral groove 51b which has a twist angle | corner of about 1 degree on the outer periphery of the shank 51a, and forms in the blade edge | tip 52 is not easy. Further, the square wire is formed on the blade 52 by being fixed to the shank 51a by a method in which the meat of the shank 51a is raised to the shape of a wedge 51c at a plurality of positions and sandwiched between the wedge 51c and one side surface of the spiral groove 51b. Has been. For this reason, the rotary blade 51 requires an increase in the diameter of the shank 51a, requires plastic processing of the wedge 51c, and a difficult operation of inserting a small flexible square into the spiral groove 51b. It was considered necessary to solve several problems that hinder manufacturing cost reduction and downsizing.

An object of the present invention is to provide a compact and inexpensive rotary blade in which the diameter of the rotation locus circle of the cutting edge is reduced while ensuring the mechanical strength of the shank, a manufacturing method thereof, and a compact and inexpensive rotary cutter using the same. Is to provide.

In the rotary blade for cutting a sheet material, the inventors have found that the smaller the force required for cutting (cutting load) is, the more convenient it is to reduce the diameter of the rotation locus circle of the cutting edge, and that the cutting edge meshes with the counterpart blade. It was noted that the cutting load is reduced as the shear angle, that is, the twist angle of the blade edge is increased. And the above-mentioned problem is applied to the rotary blade by applying the blade tip made of a strip material by twisting the strip material into a spiral shape by utilizing the special property of the strip material, that is, flexibility and ease of processing. The present invention has been found out that the above can be solved.

That is, the rotary blade according to the present invention is a rotary blade for cutting a sheet material, which is formed by combining blade edges made of a strip-like material in a spiral shape with a predetermined twist angle on the outer peripheral surface in the longitudinal direction of the shank.

The rotary blade is preferably formed such that the twist angle of the blade edge is 45 degrees or less. More preferably, the twist angle of the cutting edge is 3 degrees or more and 10 degrees or less.
Moreover, it is preferable that the ratio of the thickness to the width is 0.3 or less in the cross section orthogonal to the longitudinal direction of the belt-like material. Moreover, it is preferable that the ratio between the diameter of the rotation locus circle of the blade edge and the distance between the both ends of the blade span is 0.07 or more and 0.1 or less.

Further, it is preferable that the band-shaped material is inserted into a spiral groove formed with a predetermined twist angle on the outer circumferential surface of the shank in the longitudinal direction so that the blade edge is formed in a spiral shape. In addition, it is more preferable that the twist angle of the spiral groove corresponding to the range in which the cutting edge is cut is constant.

Further, it is preferable that the belt-like material has a spiral shape having a twist angle equivalent to that of the spiral groove in advance. Moreover, it is preferable that the said strip | belt-shaped material has the horizontal curve shape corresponding to the shape of the bottom locus | trajectory of the said spiral groove in the width direction simultaneously with the said spiral shape. The shank may be cylindrical.

The above-described rotary blade for cutting a sheet material according to the present invention processes a material into a belt-like material having a twist shape corresponding to the twist angle, and the belt-like material has the twist angle on the outer peripheral surface in the longitudinal direction of the shank. It can be manufactured by a manufacturing method combined in a spiral shape.

The above-described method for manufacturing a rotary blade for cutting a sheet material according to the present invention includes processing a material into a belt-shaped material having a predetermined lateral bending shape and forming the belt-shaped material into a twisted shape corresponding to the twist angle. It is also possible to use a manufacturing method in which the belt-shaped material is processed into a spiral shape with the twist angle on the outer peripheral surface in the longitudinal direction of the shank.

Further, in the manufacturing method described above, a material that is a strip-shaped plate or wire can be pressed from the width direction by a punch and a die to be processed into a strip-shaped material having the above-mentioned laterally curved shape. Moreover, the material which is a flat plate can be processed into a strip-shaped material having the above-mentioned laterally curved shape by punching.

Further, in the manufacturing method described above, the reference mold hole and the sub mold hole that can pass the band-shaped material processed into a predetermined lateral curved shape in a band shape are set to a predetermined angle corresponding to the twist angle. A manufacturing method in which the belt-shaped material is processed by placing the belt-shaped material through the reference mold hole and the subordinate mold hole can be applied.

Further, in the manufacturing method described above, a reference mold hole and a sub mold hole capable of passing a material that is a strip-shaped plate material or a wire have a relatively corresponding angle to the twist angle, and A manufacturing method in which the center lines of the holes are arranged so as to have a predetermined separation distance corresponding to the spiral shape, and the raw material is passed through the reference mold hole and the subordinate mold hole to process the band-shaped material. Is applicable.

Further, in the manufacturing method described above, a reference mold hole and a sub mold hole capable of passing a material that is a strip-shaped plate material or a wire have a relatively corresponding angle to the twist angle, and The center line of each hole is disposed so as to have a predetermined inclination angle corresponding to the spiral shape, and the strip material is processed by passing the material through the reference mold hole and the dependent mold hole. The manufacturing method to apply is applicable.

By applying the rotary blade according to the present invention described above, a rotary cutter for cutting a sheet material can be obtained. That is, the rotary cutter according to the present invention is configured such that the sheet material cutting rotary blade having a spiral cutting edge made of a strip-shaped material and the fixed blade having a linear cutting edge are sequentially meshed with each other at a predetermined shear angle. This is a rotary cutter that cuts wood. Moreover, it is preferable that the shear angle made by the rotary blade and the fixed blade is constant.

The rotary blade for cutting a sheet material according to the present invention has a cutting edge obtained by spiraling a thin and flexible strip material. Since the cutting edge made of a strip-like material can have a larger helix angle than in the prior art, the required cutting load is reduced by an increment of this helix angle. And since the diameter of the rotation locus circle of the cutting edge can be reduced by an amount corresponding to the reduction of the cutting load, it is possible to contribute to downsizing of the rotary blade. In addition, the flexible belt-like material can be easily formed in a spiral shape, and the blade tip and the shank can be easily formed integrally, which can contribute to reducing the manufacturing cost of the rotary blade.

Therefore, the rotary blade for cutting a sheet material according to the present invention can be put into practical use as a rotary blade that is more compact and less expensive than the conventional one without impairing the mechanical strength of the rotary blade. Further, by applying the above-described manufacturing method according to the present invention, a more inexpensive rotary blade can be provided. In addition, the application of the rotary blade according to the present invention makes it possible to put to practical use the rotary cutter according to the present invention that is suitable for cutting a sheet material that is more compact and less expensive than conventional ones. Furthermore, by mounting the rotary cutter according to the present invention, it is possible to contribute to compactness and cost reduction of a mechanical device such as a printer or a ticket vending machine and office equipment, and further weight reduction.

It is a block diagram which shows an example of the rotary blade which concerns on this invention. It is a figure which shows the positional relationship of the structural member of the rotary blade shown in FIG. It is sectional drawing in the line segment QQ of the rotary blade shown in FIG. It is a block diagram which shows an example of the rotary blade using the buffer ring 5 'of a structure different from the buffer ring 5 shown in FIG. It is a block diagram which shows the buffer ring 5 'side seen from the viewpoint different from FIG. FIG. 4 is a configuration using a shank having a cross-sectional shape different from the cross-sectional shape shown in FIG. It is a block diagram which shows an example of the rotary blade disclosed by the nonpatent literature 1. It is sectional drawing in line segment R1R1 of the rotary blade shown in FIG. It is sectional drawing in line segment R2R2 of the rotary blade shown in FIG. It is a block diagram which shows an example of the rotary cutter which concerns on this invention. FIG. 10 is a cross-sectional view taken along line PP of the rotary cutter shown in FIG. 9. It is a figure which shows the positional relationship of the structural member of the rotary cutter shown in FIG. It is an example of the strip | belt-shaped material which has a strip | belt shape and a predetermined | prescribed lateral curve shape. It is an example of the structure which presses a raw material (strip-shaped thin board | plate material) with a punch and die | dye, and processes it into the strip-shaped material shown in FIG. It is an example of the structure which processes the strip | belt-shaped raw material which has a horizontal curve shape into the strip | belt-shaped material which has a twist shape. It is an example of the structure which processes a strip | belt-shaped raw material into the strip | belt-shaped material which has a twist shape, while processing it into a transverse curve shape. FIG. 16 is a diagram illustrating a state in which a mold hole is adjusted to an intermediate stage in an example of a configuration that is processed into a band-shaped material having a twisted shape while processing a band-shaped material into a horizontally bent shape, which is different from the configuration illustrated in FIG. 15. is there. It is a figure which shows the state which adjusted the mold hole from the state shown to FIG. 16A to the last stage.

First, the technical features of the rotary blade for cutting a sheet material according to the present invention will be described in detail.
An important feature of the rotary blade for cutting sheet material according to the present invention is that a strip material having excellent flexibility and workability is applied, and the strip material is spirally formed on the outer peripheral surface of the shank with a predetermined twist angle. It is the structure which has the blade edge | tip made by arrangement | positioning. Forming the blade edge in a spiral shape with a twist angle in this way can reduce the cutting load required for cutting that engages with the counterpart blade and increases the twist angle of the blade edge. For this reason, the mechanical strength required for the rotary blade and the torque for driving the rotary blade can be reduced.

In the present invention, a highly flexible belt-like material is applied, and the cutting edge is formed in a spiral shape with a predetermined twist angle. The belt-like material is a material having a much larger flexibility than the square material used in the commercially available rotary blade 51 shown in FIG. 7, and therefore, it can be easily deformed into a spiral shape having a larger twist angle. Therefore, the application of the strip-shaped material makes it possible to easily form a cutting edge having a large helix angle as compared with the commercially available rotary blade 51 to which a square material is applied. Then, the cutting load required for cutting can be reduced by an amount corresponding to the increase in the twist angle of the cutting edge. At this time, as a rotary blade, it is not necessary to increase the mechanical strength beyond that which can withstand a required cutting load, and it may be equivalent to the conventional one. Therefore, the diameter of the rotation locus circle of the blade edge can be reduced by the amount corresponding to the reduction in the cutting load described above without reducing the mechanical strength of the rotary blade.

The rotary blade according to the present invention is formed integrally by combining a shank and a cutting edge made of a strip-like material. Even in the integration with the shank, a belt-like material having high flexibility and easy processing is advantageous. For example, when forming a strip-like material spirally on the outer circumferential surface of the shank with a predetermined twist angle, the strip-like material is arranged on the outer circumferential surface of the shank and fixed by welding or bonding to form a spiral shape Is applicable. In addition, a means for forming a spiral material by inserting a belt-like material into a spiral groove formed with a predetermined twist angle on the outer peripheral surface of the shank can be applied. At this time, since it can be flexibly elastically deformed if it is a highly flexible belt-like material, the work of arranging the belt-like material on the outer peripheral surface of the shank or inserting it into the spiral groove becomes easy. Moreover, if it is a strip | belt-shaped material made into the spiral shape previously, arrangement | positioning on the outer peripheral surface of a shank and insertion to a spiral groove will become still easier.

Further, a commercially available rotary blade 51 shown in FIG. 7 having a spiral cutting edge similar to the rotary blade according to the present invention is combined with a spiral groove formed on the outer periphery of the shank 51a. However, the twist angle that can be formed with a small flexible square is about 1 degree, and it is not easy to give a large twist angle to the cutting edge. In addition, the width of the spiral groove formed on the outer peripheral surface of the shank into which the blade tip is inserted needs to be sufficiently larger than the thickness of the square member used as the blade tip to facilitate the insertion operation. On the other hand, even if the belt-like material is hard and highly rigid for blades, it has great flexibility. Therefore, the great flexibility of the strip material facilitates the work of forming a spiral blade edge having a predetermined twist angle. In addition, when the spiral groove is used, since the large flexibility of the strip material facilitates the work of inserting the strip material into the spiral groove, the spiral groove need not have a width having an originally unnecessary gap. It is.

As described above, the blade tip can be easily formed in a spiral shape with a twist angle by arranging the strip material in a spiral shape with respect to the outer peripheral surface of the shank and using the blade tip. Moreover, advantages, such as the freedom degree of designing a simple shape and the freedom degree of a combination of materials, such as a blade member and a shank member recognized in the rotary blade disclosed in Patent Document 2, are also obtained. Therefore, according to the present invention, the shape of the cutting edge and the shank can be further simplified, the machining of each member forming the cutting edge and the shank can be facilitated, the manufacturing process and the processing time can be further shortened, etc. The effect can be obtained and the manufacturing cost can be reduced.

In addition, in the present invention, the shank and the belt-like material that becomes the cutting edge can be individually formed. Therefore, a suitable material can be used for each. For example, by applying a hard and expensive material for the blade to the cutting edge, and applying a metal material that is cheaper and tougher than that for the blade to the shank, further reduce the material cost. Can do. Therefore, the problem concerning the manufacturing cost and material cost recognized by the rotary blade disclosed in Patent Document 1 and the commercially available rotary blade 51 shown in FIG. 7 can be solved, and a cheaper rotary blade can be realized.

In the present invention, the strip material applied to the cutting edge of the rotary blade can be appropriately selected in consideration of the type and size of the sheet material to be cut, and the blade length described later. When the strip is formed to have a thickness of 0.2 to 1.5 mm and a width of 3 to 10 mm in a cross section perpendicular to the longitudinal direction, the strip material is highly flexible due to its shape and is easily deformed into a spiral shape. is there. In addition, the strip | belt-shaped material with thickness less than 0.2 mm becomes large the distortion which arises in the blade edge which meshes with the other party blade. Further, a strip-like material having a thickness exceeding 1.5 mm has a large load when deformed into a spiral shape. In addition, a strip-shaped material having a width of less than 3 mm has a low cutting edge length. In addition, a strip-shaped material having a width exceeding 10 mm increases the blade length of the blade edge.

In addition, it is preferable to select a ratio (thickness / width) of the thickness and width in the cross section orthogonal to the longitudinal direction so that the belt-shaped material is easily deformed into a large spiral shape. For example, the ratio is preferably 0.02 to 0.3. When the ratio is less than 0.02, the mechanical strength of the blade edge is lowered, and when it exceeds 0.3, the flexibility is lowered. In addition to the flexibility described above, the belt-shaped material is preferably a belt-shaped material made of a steel type such as knife steel, spring steel, or hardened steel having hardness suitable for cutting the sheet material.

Also, the above-mentioned blade length means the protruding amount (height) of the blade edge protruding from the outer peripheral surface of the shank. The tip of the blade tip protruding by this blade length becomes a direct blade that engages with the mating blade and performs sheet material cutting. Therefore, the length of the shank radius plus the cutting edge length corresponds to the radius of the rotation locus circle drawn by the cutting edge by the rotation of the rotary blade, and the tip of the cutting edge forms the outer periphery of the rotation locus circle of the rotary blade. In the rotary blade, the above-mentioned blade length is preferably formed to be 1.5 to 5.0 mm. If the blade length is 1.5 mm or more, it is easy to secure a space for passing paper regardless of the cross-sectional shape of the shank. Moreover, even if the cutting edge is made of a highly flexible belt-like material, if the cutting edge length is 5.0 mm or less, abnormal distortion is unlikely to occur in the cutting edge when engaged with the counterpart blade.

When the rotary blade according to the present invention having the above-described configuration is applied to a rotary cutter, the torque for driving the rotary blade is transmitted to the meshing point with the fixed blade that is the counterpart blade, and acts as a cutting force for cutting the sheet material. . This cutting force is usually set larger than the load (cutting load) required for cutting the sheet material. This cutting force is influenced by the torque of the rotary blade and the radius of the rotation locus circle of the blade edge. For example, when the cutting force may be constant, the torque of the rotary blade can be reduced as the radius of the rotation locus circle of the rotary blade is reduced. Accordingly, the torque can be reduced by reducing the diameter of the rotation locus circle of the cutting edge of the rotary blade, so that the drive source is reduced in size by the amount of the torque reduction, and the rotary cutter can be further downsized.

The inventors further examined the above-mentioned rotation locus circle drawn by the blade edge of the rotary blade from the viewpoint of the compactness of the rotary blade. As a result, the relationship between the sheet material width (B) to be cut and the diameter range (D1 to D2) of the rotation locus circle of the rotary blade is, for example, (B, D1 to D2) = (2 inches, 7 to 10 mm) (3 inches, 7-10 mm), (4 inches, 7-10 mm), (6 inches, 10-15 mm), (8 inches, 14-20 mm), (10 inches, 17-25 mm), (12 inches, 21 ˜30 mm) was found to be preferred. However, in each case, when the diameter of the rotation locus circle of the rotary blade is less than the lower limit value, the mechanical strength is lowered, and when exceeding the upper limit value, the compactness of the rotary blade is lowered. The inch is a name of the sheet material width and is not an actual dimension value.

In actual sheet material cutting, for example, when the rotary blade is driven with a constant torque, by forming a larger shear angle between the cutting edge of the rotary blade and the cutting edge of the counterpart blade (fixed blade) at the meshing point, A large cutting force can be obtained. For example, when the cutting edge line formed by the cutting edge of the mating blade is a straight line, the cutting edge line of the mating blade is arranged with a slight inclination with respect to the rotation axis of the rotary blade, and the cutting edges intersect each other at the meshing point. A shear angle can be formed. This shear angle is determined by the slight inclination of the mating blade and the size of the spiral twist angle of the blade edge of the rotary blade. Since the inclination is substantially smaller than the twist angle of the cutting edge, it can be said that the shear angle is determined by the twist angle of the cutting edge of the rotary blade. Further, the shear angle affects the cutting load as described above by the twist angle of the blade edge. Therefore, from the viewpoint of reducing the cutting load, it is preferable that the shear angle, which can be said to be substantially equivalent to the twist angle of the cutting edge, is large.

Also, when cutting the sheet material, the cutting edge of the rotating rotary blade generates not only a force to push the sheet material in the cutting direction but also a force to push it in the width direction by the action of the shear angle. At this time, if the shear angle is 45 degrees or less, the pushing force in the cutting direction exceeds the pushing force in the width direction, and therefore it is difficult to cause a problem that the sheet material is pushed in the width direction at the meshing point and escapes. Therefore, in the rotary blade of the present invention, it is preferable that the torsion angle of the blade edge of the rotary blade, which can be said to be substantially a shear angle, is 45 degrees or less as described above.

In the present invention, the following effects should be taken into consideration even with a flexible belt-like material. For example, the ease of processing into a twisted shape increases as the spiral twist angle of the blade edge decreases, and the amount of band-shaped material used can be reduced as the twist angle decreases. Furthermore, it is preferable to consider that there are restrictions on actual products in attempts to reduce the size of the drive source by reducing the cutting load. From such a viewpoint, it is preferable that the spiral twist angle of the blade edge is formed to be 3 degrees or more and 10 degrees or less. Similarly, the shear angle having the above-mentioned relationship with the twist angle is preferably 3 degrees or more and 10 degrees or less. If the cutting edge of the rotary blade has a twist angle of less than 3 degrees, the shear angle of the rotary cutter is also substantially less than 3 degrees, so that a drive source for obtaining a required cutting force becomes large. Moreover, since the shear angle substantially exceeds 10 degrees when the cutting edge has a twist angle exceeding 10 degrees, the load generated at the meshing point between the cutting edges increases.

In the rotary blade, one of the indexes for evaluating compactness is a ratio (aspect ratio) calculated by the formula: “diameter of the rotation locus circle of the blade edge” / “distance between both ends of the blade span”. Note that the distance between both ends of the blade span means the effective length of the cutting edge that actually performs cutting. When the effective length of the cutting edge is the same, the smaller the aspect ratio, the more compact the rotary blade. In the rotary blade for sheet material, the aspect ratio is preferably 0.07 or more and 0.1 or less, and if it is 0.07 or more, the mechanical strength as the rotary blade can be secured and cutting becomes impossible. No shank bending occurs, and if it is 0.1 or less, the rotation locus circle of the cutting edge has an excessively large diameter and does not hinder the compactness of the rotary blade.

Further, when the aspect ratio is reduced in order to obtain the compactness described above, it is preferable that the shank is cylindrical from the viewpoint of the mechanical strength of the rotary blade. Since the cylindrical shank has a circular cross-sectional outer shape in the radial direction, it has a larger section coefficient than a semicircular shape, a fan shape, or a cross-sectional shape approximate to these. For this reason, the columnar shank increases the mechanical strength against the radial bending load that acts at the time of cutting as the section modulus increases. However, as described above, the mechanical strength of the shank is not increased beyond necessity. Therefore, with the increase in mechanical strength that increases when the cross-sectional outer shape is circular, the decrease in mechanical strength due to the decrease in the diameter of the rotation locus circle of the blade edge can be compensated, and the rotation locus circle of the rotary blade edge is further reduced in diameter. be able to.

As described above, according to the present invention, a flexible band-like material is applied to the blade edge of the rotary blade regardless of the counterpart blade and its arrangement, so that the twist angle that determines the spiral shape of the blade edge is designed. Increased freedom. Moreover, the freedom degree of the design which concerns on the turning angle which determines arrangement | positioning of the blade edge in the outer periphery of a shank increases. For this reason, it is possible to obtain a rotary blade configuration in which it is easy to consider reducing the diameter of the rotation locus circle of the blade edge. Further, when the turning angle is 80 degrees or more, it is easy to ensure a preferable shear angle in relation to the blade span. Further, when the turning angle is 130 degrees or less, it is easy to secure a space for inserting the sheet material between the rotary blade and the fixed blade. Note that the turning angle here is an angle around the rotational axis of the rotary blade, and when both end points of the blade span of the blade edge and the rotational axis are projected onto a plane perpendicular to the rotational axis of the rotary blade. This corresponds to the angle formed by connecting the projected end points with the rotation axis.

Next, regarding the rotary blade for cutting a sheet material according to the present invention described above, a specific example will be given and described in detail with reference to the drawings as appropriate. The rotary cutting blade for cutting a sheet material according to the present invention is not limited to the specific examples described below. 1, 3, 4, 5, 6, 7, 8 </ b> A, 8 </ b> B, 9, 10, the arc-shaped arrow indicates the rotation direction. 9 and 10, a straight arrow indicates the sheet passing direction.
A rotary blade A shown in FIG. 1 is an example of a sheet material cutting rotary blade belonging to the present invention, which is a sheet material having a width of 6 inches or less. In the rotary blade A, the blade member 3 is disposed in a spiral shape with respect to the outer peripheral surface of the shank member 2, and the guide ring member 4 and the buffer ring member 5 are provided on both end sides of the blade member 3. FIG. 2 shows the positional relationship between the members constituting the rotary blade A, and FIG. 3 shows a radial section of the line segment QQ.

The shank member 2 of the rotary blade A is formed by machining a long round bar-shaped metal material to form a shank 2a and

shaft portions

2c and 2d extending in the longitudinal direction. The

shaft portions

2c and 2d are for providing the rotary blade A with a rotating shaft function. Further, the cross-sectional outer shape of the shank 2a in the radial direction is formed in a circular shape having a diameter of 10 mm. Further, on the shank 2a side of the

shaft portions

2c and 2d, mounting portions 2e and 2g having D-

cut locking surfaces

2f and 2h for respectively rotating the guide ring member 4 and the buffer ring member 5 are formed. . As shown in FIG. 2, a spiral groove 2b having a predetermined twist angle is formed on the outer peripheral surface of the shank 2a so as to extend in the longitudinal direction of the shank 2a.

The cross-sectional shape of the shank member 2 shown in FIG. However, the configuration of the rotary blade according to the present invention is not limited to this. For example, in order to secure a wide space for inserting a sheet material, a shank member 2 ′ having a cross-sectional shape (D-cut cross section 2a ′) in which a part is notched and the appearance is D-shaped as shown in FIG. The spiral groove 2B ′ can also be formed so as to be suitable for the cross-sectional shape.

For the blade member 3 of the rotary blade A, a band-shaped material having a thickness of 0.7 mm and a width of 4.6 mm, which is processed using a hardened band steel material as a raw material, is used. The hardened steel strip is suitable for the material of the cutting edge because it has a hardness suitable for a blade by a quenching process or the like. The ratio of the thickness to the width is 0.15. In addition, when using a metal material for the above-mentioned shank member 2, in consideration of functionality and material cost, it is preferable to give priority to toughness against bending load at the time of cutting rather than hardness.

The above-mentioned combination of the blade member 3 and the shank member 2 is performed by a method in which the effective length for cutting the blade edge line 3a, that is, the so-called blade span is set to 162 mm and inserted into the spiral groove 2b formed on the outer periphery of the shank 2a. . The width of the spiral groove 2b formed in the shank 2a is formed to be equal to the thickness of the insertion portion 3b of the blade member 3. Thereby, each other can be fixed integrally using fitting. Further, it can be integrated more firmly by laser welding. In addition, even if the groove width of the spiral groove is equal to or greater than the thickness of the band-shaped material to be inserted, they can be fixed to each other by means such as an adhesive or welding.

The spiral shape of the blade member 3 is formed so that the turning angle is 120 degrees. Further, the target value is set so that the inner diameter of the twist is equal to the diameter of the inscribed circle with respect to the bottom locus of the spiral groove 2b, and the spiral shape of the blade member 3 is formed to have the same twist angle as that of the spiral groove 2b. It is. Thus, if the blade member is plastically deformed in advance, the insertion operation into the spiral groove can be facilitated. The band-shaped material itself may be plastically deformed into a shape having a twist angle enough to be inserted into the spiral groove 2b by elastic deformation of the band-shaped material itself. Further, the blade member 3 of the rotary blade A is deformed in a spiral shape with the same twist angle over the entire length. In addition, for example, the deformation can be made such that the twist angle gradually increases from the middle toward the end of cutting.

Thereafter, both end sides in the longitudinal direction of the blade member 3 are fixed in a state where they are abutted against the respective side surfaces of the guide ring member 4 and the buffer ring member 5. Providing a guide ring member or buffer ring member on the rotary blade smoothly guides the contact between the rotating rotary blade and the mating blade to the cutting edge line of the rotary blade on the cutting start side and the cutting edge line of the rotary blade on the cutting end side. This is effective because a series of operations such as smooth separation from the center and transition to the cutting start side again becomes smooth.

In the case of the rotary blade A shown in FIGS. 1 and 2, the guide ring member 4 is located on the cutting start side. And it has the ring-shaped part 4a which has the outer peripheral surface of the same diameter as the rotation locus circle | round | yen of the blade edge | tip of the rotary blade A, and the through-hole 4b which has the hole shape corresponding to the attachment part 2e including the locking surface 2f of the shank member 2. FIG. On the other hand, the buffer ring member 5 is located at the end of cutting. A portion having the same diameter as the rotation locus circle of the cutting edge of the rotary blade A becomes the maximum diameter on the outer peripheral surface, and the guide portion 5a formed so that the radius of the outer peripheral surface gradually decreases in a spiral shape, and the shank member 2 The through-hole 5b having a hole shape corresponding to the mounting portion 2g is included.

Each of the guide ring member 4 and the buffer ring member 5 is formed by stacking 4 to 5 metal flat plate punched pieces having characteristics equivalent to those of the blade member 3, and joining portions 4c on the outer peripheral surfaces of the ring-shaped portion 4a and the guide portion 5a. 5c was integrally formed by welding. Such simple means is more advantageous in terms of manufacturing cost and material cost than, for example, cutting out from a single metal material as a single piece.

Here, a method of joining the band-shaped material serving as the cutting edge and the buffer ring will be described.
In the case of the rotary blade A shown in FIGS. 1 and 2, the end portions of the band-shaped material are abutted against the side surfaces of the buffer ring member 5. A method considered to be different from this is shown in FIGS. 4 and E5. In FIG. 5, the buffer ring member 5 ′ side is viewed from a different viewpoint from that in FIG. 4. The buffer ring member 5 ′ is different from the buffer ring member 5 shown in FIGS. 1 and 2 in a gap 5′d formed in the guide portion 5′a. The gap 5′d of the buffer ring member 5 ′ has the same diameter as the rotation locus circle of the cutting edge, which is the maximum diameter of the outer peripheral surface, and the radius of the outer peripheral surface gradually decreases in a spiral shape to reach the minimum diameter. It is formed between the places.

When fixing one end of the belt-like material that is the blade member, according to the configuration shown in FIGS. 4 and 5, the blade member 3 ′ is simply inserted by inserting the blade member 3 ′ into the gap 5 ′ d. One end can be held. In this case, the length of the blade member 3 ′ is extended from the blade member 3 shown in FIGS. 1 and 2 by the depth of the gap 5 ′ d, that is, the thickness of the buffer ring 5 ′. It can be said that the influence can be ignored.

Further, the width of the gap 5 ′ d into which the blade member 3 ′ is inserted may be at least equal to or greater than the thickness of the blade member 3 ′, and may be wide. For example, when the width of the gap 5′d is equal to the thickness of the blade member 3 ′, it can be fixed by fitting, and when it is wider than the thickness of the blade member 3 ′, the blade member hits the rear in the rotation direction at the time of cutting. By inserting the blade member 3 ′ in consideration of the direction of twisting so that the side surface of 3 ′ abuts against the wall surface of the gap 5′d, the blade member 3 ′ that receives a reaction force at the time of cutting is removed from the gap 5 ′. This is because it can be supported by the wall surface d.

As described above, in the rotary blade A, after the blade member 3 was formed in a spiral shape with respect to the shank member 2, the blade member 3 was subjected to outer peripheral polishing while rotating the shank member 2. Then, the protruding end of the cutting edge was sharpened so that the rotation locus circle diameter of the cutting edge was 15 mm, and finished to a cutting blade. As a result, the rotary blade A has a blade span of 162 mm, a rotational locus circle diameter of the blade edge of 15 mm, and an aspect ratio of 0.09 according to the above formula.

Next, the technical features of the rotary cutter according to the present invention will be described in detail.
The rotary cutter according to the present invention is configured using the sheet material cutting rotary blade according to the present invention having the above-described configuration. That is, the rotary cutter that cuts the sheet material by sequentially engaging the rotary blade for cutting the sheet material having a spiral cutting edge line and the fixed blade having a linear cutting edge line with a predetermined shear angle. . As described above, the rotary blade according to the present invention has a reduced diameter of the rotation locus circle of the cutting edge and a reduced size of the drive source, and can be formed inexpensively even if it is long. Therefore, the rotary cutter according to the present invention can also be made compact and inexpensive as never before.

It is preferable that the rotary cutter according to the present invention described above has a constant shear angle formed by the rotary blade and the fixed blade. By keeping the shear angle constant, the cutting points that are the meshing points of the rotary blade and the fixed blade can be successively and stably formed from the start of cutting to the end of cutting. Therefore, the cut | disconnected sheet | seat material can have the cut end of the quality without a fuzz and a fine wrinkle. Moreover, it is preferable to constitute a rotary cutter in which the rotary blade rotates in a direction to increase the twist of its own blade edge. With this configuration, it is possible to enhance the resistance effect against the reaction force generated when the rotary blade meshes with the counterpart blade and cuts the sheet material.

In the above-described rotary cutter, it is preferable that the drive source for driving the rotary blade is connected to one end of the shank at the end of cutting. The amount of torsional deformation between the shank input side and the meshing point becomes larger as the meshing point is located farther from the drive force input side. A shank in a twisted state becomes unstable as the amount of torsional deformation increases and the amount of torsional deformation increases. When the amount of twist deformation of the shank varies, the transition speed of the meshing point varies during cutting. If the fluctuation of the transition speed of the meshing point becomes excessive, the blade edge of the fixed blade gets on the sheet material and is separated from the blade edge of the rotary blade, and the sheet material is folded between the blade edges so that cutting becomes impossible. There is. In this case, by disposing the drive source as described above, the amount of twist deformation of the shank can be reduced as the cutting progresses, so that the influence of fluctuation of the amount of twist deformation of the shank on the transition speed of the meshing point can be suppressed.

Next, the above-described rotary cutter according to the present invention will be described in detail with reference to the drawings, taking an example using the rotary blade A described above. The rotary cutter according to the present invention is not limited to the specific examples described below.
FIG. 9 shows the external appearance, and FIG. 10 shows a radial section of the line segment PP. The rotary cutter B is configured by using a rotary blade A for cutting a sheet material having a width of 6 inches or less. Is a rotary cutter belonging to The rotary cutter B cuts a sheet material (not shown) by sequentially engaging a rotary blade A having a spiral cutting edge line 3a and a fixed blade 1 having a linear cutting edge line 1a with a predetermined shear angle. 11 and is constituted by various members shown in FIG. Specifically, in addition to the rotary blade A and the fixed blade 1, the fixed blade holder 6 to which the fixed blade 1 is attached, the

side plates

7 and 8 that support the

shaft portions

2 c and 2 d of the rotary blade A and the fixed blade holder 6, and the

side plate

7 and 8 have a lower frame 9, an upper frame 10, and the like. Further, the

side plates

7 and 8, the lower frame 9, and the upper frame 10, which form the framework of the entire apparatus as the rotary cutter B, are provided with through

holes

7 a, 7 b, 8a and 8b and the

tap holes

9a, 9b, 10a and 10b are fastened. Thereby, the fall of the

side plates

7 and 8 at the time of a cutting | disconnection can be prevented.

The rotary blade A can be rotated by inserting the

shaft portions

2c and 2d on both ends into the through holes 13a of the bearing 13, and further inserting the outer ring of the bearing 13 into the through

holes

7c and 8c of the

side plates

7 and 8. It is supported. And drive means (not shown), such as a drive source for rotating the rotary blade A, is provided on the shaft portion 2d side which is the end of cutting.

The fixed blade 1 that is the counterpart blade of the rotary blade A is a flat plate having a flat surface 1b that can be in close contact with the mounting surface 6a of the fixed blade holder 6, and the edge in the longitudinal direction is formed into a straight edge line 1a. Has been. Moreover, the fixed blade 1 inserts the

convex portions

6b and 6c provided on the mounting surface 6a into the through

holes

1c and 1d provided on the flat surface 1b, performs positioning at the location of the convex portion 6b, and performs mechanical positioning at the location of the convex portion 6c. It is attached to the fixed blade holder 6 by caulking.

Further, the fixed blade 1 has an angle of 0.18 degrees with respect to the rotational axis of the rotary blade A such that its own blade edge line 1a contacts and meshes with the blade edge line 3a of the rotary blade A at one point. They are arranged at an angle. This is a method in which the rotational axis of the rotary blade A is arranged perpendicular to the sheet passing direction of the sheet material, and the fixed blade holder 6 to which the fixed blade 1 is attached is moved by an amount corresponding to the biting angle. went. Specifically, when the

pins

11 and 12 pivotally supported by the through

holes

6d and 6e are inserted into the through

holes

7d and 8d of the

side plates

7 and 8, the positions are biased by a corresponding amount. In addition, when the biting angle is 0.08 degrees or more, the contact between the blade edges at one point is easily stabilized. Moreover, the smoothness of a transition of a contact point is easy to be acquired as a biting angle is 2.0 degrees or less.

In the fixed blade holder 6, the coil portion of the coil spring 14 having a predetermined elastic force is communicated with the shaft portion 12 a of the pin 12 that pivotally supports one side of the fixed blade holder 6. One leg 14 a of the coil spring 14 is moored at the notch 8 e of the side plate 8, and the other leg 14 b is hung on the fixed blade holder 6. With this configuration, the elastic force of the coil spring 14 is transmitted from the foot 14 b to the fixed blade holder 6, that is, the fixed blade 1, and the fixed blade 1 can be urged against the rotary blade A with an appropriate pressure contact force.

Further, an abutting portion 6f is provided near the center of the fixed blade holder 6 in the longitudinal direction. This is to cope with a case where an abnormal load acts on the fixed blade 1 and the fixed blade holder 6 moves backward against the elastic force of the coil spring 14 when the sheet material is cut. In this case, the abutting portion 6f of the fixed blade holder 6 comes into contact with the receiving surface 10c of the upper frame 10, and the above-described abnormal load can be received by the upper frame 10. Thereby, abnormal bending deformation does not occur in the fixed blade 1.

In the rotary cutter B having the above-described configuration, the linear cutting edge line 1a of the fixed blade 1 and the spiral cutting edge line 3a of the rotary blade A are maintained at a shear angle of 5.6 degrees from the start to the end of cutting. Contact at one point. This contact forms a cutting point where the blade edges mesh with each other with an appropriate pressure contact force. Then, the sheet material (not shown) inserted into the paper passing space 30 between the rotary blade A and the fixed blade 1 is orthogonal to the insertion direction by moving the cutting point sequentially with the progress of cutting. Cut to any length in the direction.

Further, the rotary cutter B described above can control the rotation of the rotary blade A in accordance with the sheet material conveyance speed. As a result, the sheet material that is moving in the paper direction in the space 30 between the rotary blade A and the fixed blade 1 can be made into a rotary cutter that can be cut simultaneously with conveyance. Such a rotary cutter B can also cut a sheet material that is stationary in the space 30.

Next, a series of operations for cutting the stationary sheet material by the above-described rotary cutter B will be described in detail with reference to the drawings as appropriate.
In the rotary cutter B in the standby state shown in FIG. 10, the sheet material to be cut is not shown, but is stationary at a predetermined position in the space 30. At this time, the rotary blade A is in a stationary state. Further, the cutting edge line 1a of the fixed blade 1 is in contact with the ring-shaped portion 4a which is the outer peripheral surface of the guide ring member 4 located on the cutting start side of the rotary blade A.

When the rotary blade A rotates in the direction indicated by the arrow, the blade edge line 1a of the fixed blade 1 slides on the outer peripheral surface of the ring-shaped portion 4a of the guide ring member 4 and approaches a portion connected to the blade edge line 3a of the rotary blade A. . Eventually, the edge line 1a of the fixed blade 1 moves away from the ring-shaped portion 4a of the guide ring member 4 and moves to the edge line 3a of the rotary blade A. And the meshing point which the

blade edge lines

1a and 3a contact at one point is formed. When the rotary blade A further rotates, the meshing point shifts to one end of the sheet material along the

cutting edge lines

1a and 3a. Eventually, when the mesh point reaches one end of the sheet material, the mesh point becomes a cutting point and the sheet material is cut. When this meshing point moves in the width direction of the sheet material and reaches the other end of the sheet material, the sheet material is completely cut in the width direction.

When the rotary blade A continues to rotate after the sheet material is cut as described above, the cutting edge line 1a of the fixed blade 1 is separated from the cutting edge line 3a of the rotary blade A. At substantially the same time as this separation, the cutting edge line 1 a of the fixed blade 1 is in contact with the guiding portion 5 a serving as the outer peripheral surface of the buffer ring member 5. By this operation, the

cutting edge lines

1a and 3a are brought into a non-contact state and the meshing is eliminated. When the meshing is eliminated, the cutting edge line 1a of the fixed blade 1 is in contact with the position of the maximum diameter of the guide portion 5a of the buffer ring member 5. Although this position corresponds to a position corresponding to the same diameter as the ring-shaped portion 4 a of the guide ring member 4 in the radial direction of the rotary blade A, the cutting edge line 1 a of the fixed blade 1 is separated from the ring-shaped portion 4 a of the guide ring member 4. It is in a separated state. This is due to the biting angle applied to the rotational axis of the rotary blade A.

The cutting edge line 1a of the fixed blade 1 that is in contact with the buffer ring member 5 and not in contact with the guide ring member 4 slides on the guide portion 5a of the buffer ring member 5 on the cutting end side as the rotary blade A rotates. While moving, it approaches the ring-shaped portion 4a of the guide ring member 4 on the cutting start side. This is due to the guide portion 5a of the buffer ring member 5 that has a small diameter spirally along the rotation direction. Thereafter, the cutting edge line 1 a of the fixed blade 1 smoothly contacts the ring-shaped portion 4 a of the guide ring member 4, and at the same time is separated from the guide portion 5 a of the buffer ring member 5. Thus, due to the special effect of the buffer ring member 5, the cutting edge line 1a of the fixed blade 1 biased by the coil spring 14 is changed from the guide portion 4a of the buffer ring member 5 to the ring-shaped portion 4a of the guide ring member 4. The transition can be made smoothly without mechanical collision.

Thereafter, when the rotary blade A returns to the initial position, the cutting edge line 1a of the fixed blade 1 also returns to the initial position, and the rotary cutter B returns to the initial standby state.
Through the series of cutting operations described above, the rotary cutter B can cut the sheet material that is inserted into the space 30 between the rotary blade A and the fixed blade 1 and is stationary in the width direction. The sheet material after cutting thus obtained is a good one having no fuzz or wrinkles at the cut end. The series of sheet material cutting operations by the rotary cutter B described above is the same even in the rotary cutter using the rotary blade formed of the shank member 2 ′ having the D-cut cross section 2a ′ shown in FIG.

Next, regarding the method for manufacturing the above-described rotary blade for cutting a sheet material according to the present invention, a method that the present inventors consider preferable will be described.
When manufacturing the rotary blade which concerns on this invention, it is preferable to form a spiral groove in the outer peripheral surface of the longitudinal direction of a shank as mentioned above. In this case, for example, a strip-shaped material that is straight and processed to a predetermined length and has excellent flexibility can be formed on the spiral blade edge by a simple method of inserting the strip-shaped material into the spiral groove. .

The spiral groove formed on the outer peripheral surface of the shank is formed with a predetermined twist angle. And the spiral groove is extended in the longitudinal direction of the shank in appearance. By inserting a band-shaped material as a cutting edge into such a spiral groove, the inserted band-shaped material is formed in a spiral shape having a twist angle equivalent to that of the spiral groove. Therefore, the blade edge can be easily formed in a spiral shape having a desired twist angle simply by forming the twist angle of the spiral groove to a desired angle. Therefore, such a manufacturing method is effective in reducing the manufacturing cost of the rotary blade.

In the case of the manufacturing method described above, it is preferable that the spiral angle of the spiral groove corresponding to the range in which the cutting edge is cut is constant. Spiral grooves with a constant helix angle can be easily grooved using a processing machine such as an end mill, and waste time such as setup change can be reduced. Therefore, it is effective for further reducing the manufacturing cost. Moreover, since the cutting load is constant from the start to the end of cutting, the cutting operation and the cutting quality can be further stabilized.

Also, the spiral groove provided on the outer peripheral surface of the shank is preferably formed with a width equivalent to the thickness of the strip material applied to the cutting edge. Thereby, a strip | belt-shaped material is restrained in a fitting state with respect to a spiral groove substantially. In addition, the missing amount of the cross section in the radial direction of the shank is reduced as compared with the commercially available rotary blade 51 shown in FIG. For this reason, the section modulus of the shank is increased by this reduced amount, and the mechanical strength against the radial bending load acting at the time of cutting is increased. However, the mechanical strength of the shank need only be equivalent to that of the conventional one, and will not be increased beyond necessity. Therefore, the mechanical strength of the shank, which decreases when the diameter of the rotation locus circle of the cutting edge is reduced, can be compensated using this margin of mechanical strength, and the rotation locus circle of the cutting edge of the rotary blade can be further reduced in diameter.

In addition, when the strip-like material is inserted into the spiral groove, the above-described means using the fitting is effective for reducing the manufacturing cost. Further, in the case where stronger fixation is desired, a method of fixing the inner side or the edge of the spiral groove using an adhesive or a brazing material is preferable. Further, a method of welding using a laser or the like is preferable because the influence on the manufacturing cost is small.

Moreover, in the method for manufacturing a rotary blade according to the present invention, it is preferable to use a strip-like material that has been processed into a spiral shape in advance. That is, the rotary blade according to the present invention in which cutting edges made of a band-shaped material are combined in a spiral shape with a predetermined twist angle is processed into a band-shaped material having a twist shape corresponding to the twist angle. It can be obtained by a manufacturing method in which a material is combined in a spiral shape with the twist angle on the outer peripheral surface in the longitudinal direction of the shank.

The band-shaped material having a twisted shape in advance can easily form the cutting edge in a desired spiral shape without being greatly deformed. Moreover, when using the spiral groove | channel mentioned above, if it is a strip | belt-shaped material which has a twist shape with a twist angle equivalent to a spiral groove | channel, insertion of a strip | belt-shaped material can be performed further easily. For example, if a band-shaped material is processed in advance into the twisted shape using a jig or tool capable of mechanically torsionally plastically deforming, the cutting edge of the band-shaped material formed spirally by a spiral groove Therefore, it is possible to prevent the twisting angle of the cutting edge line from fluctuating due to the warping caused by the elasticity of the belt-like material.

Further, the band-like material used as the blade edge can be processed in advance or simultaneously with the twisted shape, and at the same time with a laterally curved shape corresponding to the shape of the bottom locus of the spiral groove described above. That is, the rotary blade according to the present invention in which the cutting edges made of a band-shaped material are combined in a spiral shape with a predetermined twist angle, the material is processed into a band-shaped material having a predetermined horizontal bending shape, and the band-shaped material is processed as described above. It can be obtained by a manufacturing method in which a band-shaped material having a twisted shape corresponding to a twist angle is processed, and the band-shaped material is combined with the outer peripheral surface in the longitudinal direction of the shank in a spiral shape with the twist angle. When the band-shaped material obtained in this way is used, the work of combining the band-shaped material in a spiral shape with the twist angle on the outer peripheral surface in the longitudinal direction of the shank is further facilitated.

In addition, a strip | belt shape means a long shape like the strip | belt which has a plate-shaped cross section whose thickness is thinner than a width | variety. Further, the laterally bent shape means a shape that is bent in the width direction, not in the thickness direction of the belt-like material. Since the band-shaped material having a laterally bent shape is likely to have high adhesion when inserted into the bottom shape of the spiral groove, it can be more securely fixed to the shank. Further, the predetermined laterally curved shape is a curved shape such as an arc shape or a bow shape that can be formed by combining one curvature or a plurality of curvatures, and is a shape of a spiral trajectory when a blade edge is disposed on a shank. The shape corresponding to the shape or the shape corresponding to the shape of the bottom locus of the spiral groove formed in the shank. In the band-shaped material having such a laterally curved shape, an edge to be disposed on the outer peripheral surface of the shank is formed in the curved shape.

Next, a manufacturing method that the present inventors consider preferable when manufacturing the strip material used for the cutting edge of the rotary blade for cutting a sheet material according to the present invention described above will be described with reference to the drawings as appropriate. In addition, the manufacturing method of the said strip | belt-shaped material which concerns on this invention is not limited to the specific example demonstrated below.

First, the belt-shaped material having the above-described laterally curved shape will be described. A belt-shaped material 100 shown in FIG. 12 is a material obtained by processing a material into a predetermined lateral curve shape in a belt shape. In addition, the linear arrow shown to the left in the figure represents the width direction of the strip-shaped material 100, and the linear arrow shown to the right in the figure represents the longitudinal direction of the strip-shaped material 100. This strip-shaped material 100 is disposed in a spiral shape with respect to the outer peripheral surface of the shank, and can be formed on a spiral blade edge. Further, the predetermined laterally curved shape is a curved shape such as an arc shape or a bow shape that can be formed by combining one curvature or a plurality of curvatures, and is a shape of a spiral trajectory when a blade edge is disposed on a shank. The shape corresponding to the shape or the shape corresponding to the shape of the bottom locus of the spiral groove formed in the shank. In the case of the strip-shaped material 100, the edge 100a to be disposed on the outer peripheral surface of the shank is formed in the curved shape.

There are several methods for manufacturing the belt-shaped material 100 described above. For example, it is possible to apply a method in which a material that is a strip-shaped plate or wire is pressed from the width direction with a punch and a die (hereinafter referred to as “edge bending”), and thereby processed into a predetermined laterally curved shape. Further, a method of punching a material that is a flat plate with a press or the like (hereinafter referred to as “punching”) and processing it into a predetermined laterally curved shape can be applied. At this time, if the material is an individual piece corresponding to the length of the cutting edge of the rotary blade, an individual belt-shaped material having a length suitable for the cutting edge can be obtained. Further, if the material is longer than the length of the blade edge of the rotary blade, a long belt-shaped material can be obtained and further cut to a desired length.

For example, FIG. 13 is an example of the edge bending process described above, and shows a stage in which a strip-shaped thin plate material is processed into a strip-shaped material 101. In this method, the material is pressed between the punch 110 and the die 111 moved in the direction indicated by the arrow, and can be plastically deformed into a desired laterally bent shape to be processed into a belt-shaped material. In this case, as shown in FIG. 13, the strip-shaped thin plate material, which is a material, is pressurized from the width direction. Further, in the punch 110 and the die 111, the punch surface 110a and the die surface 111a for pressing the material are preferably formed so as to have the predetermined curved shape described above in the longitudinal direction of the material. In addition, the formation of the punch surface 110a and the die surface 111a preferably takes into account the elastic return (spring back) of the material to be processed. Thereby, a raw material can be made into a desired transverse curve shape by one pressurization. Further, as shown in FIG. 13, when a plurality of materials are supplied, a plurality of strip-shaped materials 101 are obtained at a time.

Next, a method of processing a strip-shaped material corresponding to one cutting edge as shown in FIG. 12 or a longer strip-shaped material corresponding to a plurality of cutting edges into a strip-shaped material having a desired twisted shape will be described.
First, two or more mold holes that allow the passage of the strip-shaped material that has been strip-shaped and processed into a predetermined lateral curved shape are arranged. Of the plurality of mold holes, the strip-shaped material is desired based on the positional relationship between the reference mold hole and the reference mold hole that starts the twisting of the strip-shaped material. A mold hole (subordinate mold hole) that bears the final plastic deformation leading to the torsional shape is defined.

These mold holes correspond at least to the cross-sectional shape of the strip-shaped material passing through the hole shape of the reference mold hole and the subordinate mold hole. Thus, in the hole or in the vicinity thereof, the belt-shaped material has a degree of freedom in which plastic deformation can be smoothly performed. In other words, the belt-shaped material is constrained so as not to cause harmful vibrations in the dimensional accuracy after the deformation. Further, the reference mold hole and the dependent mold hole are arranged so as to have a predetermined angle corresponding to the twist angle (hereinafter referred to as “target twist angle”) of the blade edge of the rotary blade to be spiral. At this time, if the reference mold hole and the dependent mold hole are arranged so that the center lines of the holes coincide with each other, it is possible to relatively easily adjust the angle. Then, another mold hole is arranged before and after the reference mold hole and the subordinate mold hole as necessary. The predetermined angle corresponding to the torsional angle of the cutting edge here means that the desired torsion angle of the strip obtained by this torsion processing is the same as or close to the target torsion angle. This is an angle determined in consideration of the twist angle and the distance between the dependent mold hole and the reference mold hole.

In the above-described configuration, particularly important mold holes for processing into a desired twisted shape are the reference mold hole and the subordinate mold hole. These other mold holes may be arranged in an auxiliary manner to reduce the processing load acting on the reference mold hole and the sub mold holes and to stabilize the posture of the strip material passing through the mold holes. it can. In this case, the plastic deformation of the belt-shaped material can be contracted by a mold hole arranged between the reference mold hole and the dependent mold hole, and the final plastic deformation can be performed by the dependent mold hole.
When the band-shaped material is inserted and pulled out through two or more mold holes arranged in such a configuration, the band-shaped material is twisted and plastically deformed at least between the reference mold hole and the subordinate mold hole. Finally, it can be processed into a band-shaped material having a desired twist angle in a band shape.

As an example of the configuration described above, for example, a case where two mold holes are arranged is shown in FIG. In the configuration shown in FIG. 14, the reference mold hole 120 and the dependent mold hole 121 are arranged, and the center line Y and the dependent mold hole 121 are dependent on the center line X and the reference line P of the reference mold hole 120. The positional relationship of the line R is defined. The sub mold hole 121 has its center line Y aligned with the center line X of the reference mold hole 120. In this state, the dependent mold hole 121 is configured such that its own reference line Q has a separation distance L ₀ with respect to the reference line P of the reference mold hole 120. Then, the dependent mold hole 121 positions the dependent line R so that its own reference line Q has an angle θ ₀ with respect to the reference line P of the reference mold hole 120 relatively around the center line X. It is.

As a result, the surface including the reference line P and the surface including the reference line Q are parallel to each other, and both surfaces are orthogonal to the surface including the center lines X and Y. Further, the reference line Q and the dependent line R are in the same plane. The center line X and the center line Y coincide with each other. In addition, as described above, the angle θ ₀ takes into account the target twist angle and the separation distance L ₀ so that the desired twist angle of the strip obtained by this twisting process is substantially the same as the target twist angle described above. Can be adjusted. Further, the separation distance L ₀ can be adjusted after the angle θ ₀ is determined. In the series of adjustments described above, it is preferable to consider the springback of the strip-shaped material to be processed.

The band-shaped material inserted into the two mold holes arranged in the above-described configuration is passed from the reference mold hole 120 to the dependent mold hole 121 while being pulled out in the direction indicated by the linear arrow. In this passing process, the band-shaped material having a laterally curved shape is plastically twisted between the reference mold hole 120 and the sub mold hole 121 to cope with the separation distance L ₀ , the angle θ ₀ , and the pulling force. It can be processed into a strip-like material having a desired twisted shape.

Next, the material is not limited to the above-described belt-shaped material that has been processed into a bend shape in advance, and is processed into a belt-shaped material having a desired twisted shape using straight belt-shaped materials (hereinafter collectively referred to as “materials”). A method will be described.
First, two or more mold holes capable of passing the above-described material are arranged. Based on the positional relationship between the reference mold hole serving as a reference for starting torsion processing of the material and the reference mold hole among the plurality of mold holes, the material finally reaches the desired twisted shape. A dependent mold hole for plastic deformation is defined. Further, at least the reference mold hole and the sub mold hole correspond to the cross-sectional shape of the material passing through the hole shape for the same reason as the configuration shown in FIG.

FIG. 15 shows an example of the configuration in which two mold holes are arranged. In the configuration shown in FIG. 15, the reference mold hole 130 and the subordinate mold hole 131 are arranged, and the center line Y and subordinate of the subordinate mold hole 131 with respect to the center line X and the reference line P of the reference mold hole 130 are arranged. The positional relationship of the line R is defined. The sub mold hole 131 is relatively around the center line X with its own center line Y coincident with the center line X of the reference mold hole 130, and its own reference line Q is the reference of the reference mold hole 130. An angle θ ₁ is set with respect to the line P. After defining this angle θ ₁ , the dependent mold hole 131 has its own reference line Q having a separation distance L ₁ with respect to the reference line P of the reference mold hole 130, and its own center line Y is the reference. The dependent line R is positioned so as to have a predetermined inter-axis distance S with respect to the center line X of the mold hole 130.

As a result, the center line X and the center line Y have an inter-axis distance S, and the surface including the reference line P and the surface including the reference line Q are parallel to each other. It will be orthogonal to the plane containing both. Further, the reference line Q and the dependent line R exist in the same plane. Therefore, apparently, having an inter-axis distance S is different from the configuration shown in FIG. The inter-axis distance S is the shift amount of the dependent mold hole 131 with respect to the reference mold hole 130 for processing into a laterally curved shape (the curved shape) corresponding to the shape of the spiral locus of the cutting edge of the rotary blade. Become. Further, the angle θ ₁ can be adjusted in consideration of the target twist angle, the separation distance L ₁ and the inter-axis distance S described above. Further, the order of determining the angle θ ₁ , the separation distance L ₁ , and the inter-axis distance S is not limited.

In this way, the mold hole is processed into a spiral shape having a desired twist angle, and the angle θ ₁ , the separation distance L in consideration of the target twist angle and the shape of the spiral trajectory. ₁ and the inter-axis distance S are adjusted and arranged. In the series of adjustments described above, it is preferable to consider the spring back of the material to be processed.

The material inserted into the two mold holes arranged in the above-described configuration is passed from the reference mold hole 130 to the dependent mold hole 131 while being pulled out in the direction indicated by the linear arrow. In this passing process, the band-shaped material plastically bends and deforms at the same time as the torsional deformation between the reference mold hole 130 and the dependent mold hole 131, and the separation distance L ₁ , the angle θ ₁ , and the interaxial distance S , And a strip having a desired twisted shape corresponding to the pulling force. In addition, when the laterally curved shape of the material is sufficiently adapted to the shape of the spiral trajectory of the blade edge from the beginning, it is apparently the same as the configuration shown in FIG. Become.

Further, another method of processing the above-mentioned material, which is the above-described band-shaped material having the above-described bend shape or a straight band-shaped material, into a band-shaped material will be described with reference to FIGS. 16A and 16B.
The configuration shown in FIGS. 16A and 16B is an example of a configuration in which two mold holes through which the material can pass, that is, a reference mold hole 140 and a dependent mold hole 141 are arranged. In the process of determining the positional relationship between the center line Y and the dependent line R of the dependent mold hole 141 with respect to the center line X and the reference line P of the reference mold hole 140, FIG. The state is shown in FIG. 16B.

In FIG. 16A, the center line Y of the dependent mold hole 141 is made to coincide with the center line X of the reference mold hole 140. The dependent mold hole 141 is located at a position where the center lines X and Y coincide with each other, and the reference line Q of the dependent mold hole 141 is relatively angled with respect to the reference line P of the reference mold hole 140 around the center line Y. It is to have a theta _2. Further, after determining the angle θ ₂ , the dependent mold hole 141 has its dependent line R ₂ so that its own reference line Q has a separation distance L ₂ with respect to the reference line P of the reference mold hole 140. Is defined.

By the adjustment so far, the plane including the reference line P and the plane including the reference line Q are both orthogonal to the plane including the center lines X and Y. Therefore, the plane including the reference line P and the plane including the reference line Q are parallel. The dependent line R ₂ and the reference line Q are in the same plane. The center line X and the center line Y coincide with each other. Therefore, the two mold holes in the positional relationship shown in FIG. 16A are apparently the same as the structure of the mold holes shown in FIG. From this state, the positional relationship shown in FIG. 16B can be obtained by positioning the dependent mold hole 141 so as to have an inclination angle α with respect to the reference mold hole 140. That is, in FIG. 16B, the center line Y of the dependent mold hole 141 has an inclination angle α with respect to the center line X of the reference mold hole 140 or the center line X of the reference mold hole 140. as the surface has an inclination angle α which includes the reference line Q of the dependent die hole 141 and dependent line R _2, are positioned subordinate line R to adjust the dependent die hole 141.

With the adjustment described above, as shown in FIG. 16B, the center line Y of the dependent mold hole 141 is inclined with respect to the plane including the reference line P orthogonal to the center line X of the reference mold hole 140. Will be positioned. Note that the inclination angle α is the amount of inclination of the dependent mold hole 141 with respect to the reference mold hole 140 for processing into a laterally curved shape (the curved shape) corresponding to the shape of the spiral locus of the cutting edge of the rotary blade. . The angle θ ₂ can be adjusted in consideration of the target twist angle, the separation distance L _2, and the inclination angle α described above. Further, the order in which the angle θ ₂ , the separation distance L ₂ , and the inclination angle α are determined is not limited.

In this manner, the mold hole is processed into a spiral shape having a desired twist angle, and the angle θ ₂ and the separation distance L are considered in consideration of the target twist angle and the shape of the spiral trajectory. ₂ and the tilt angle α are adjusted and arranged. In the series of adjustments described above, it is preferable to consider the spring back of the material to be processed.

The material inserted into the two mold holes arranged in the above-described configuration is passed from the reference mold hole 140 to the dependent mold hole 141 while being pulled out in the direction indicated by the linear arrow. In this passing process, between the reference mold hole 140 and the dependent mold hole 141, the band-shaped material is plastically laterally deformed and simultaneously twisted to form a separation distance L ₂ , an angle θ ₂ , an inclination angle α, And a strip-like material having a desired twisted shape corresponding to the pulling force. In addition, when the laterally curved shape of the material is sufficiently adapted to the shape of the spiral trajectory of the blade edge from the beginning, it is apparently the same as the configuration shown in FIG. Become. In this method, the configuration is not limited to that shown in FIGS. 16A and 16B, and two or more mold holes including the reference mold hole 140 and the dependent mold hole 141 described above may be arranged.

A. Rotary blade B. Rotary cutter Fixed blade 1a. Cutting edge line 1b.

Plane

1c, 1d. Through hole 2, 2 '.

Shank member

2a, 2a '.

Shank

2b, 2b '.

Spiral groove

2c, 2d. Shaft 2e, 2g. Mounting part 2f, 2h. 2. Locking surface Blade member 3a. Cutting edge line 3b. Insertion section 4. Guide ring member 4a. Ring-shaped part 4b. Through hole 4c. Junction 5,5 '. Buffer ring member 5a, 5'a. Guide part 5b. Through hole 5c. Junction 5'd. Gap 6. Fixed blade holder 6a. Mounting

surface

6b, 6c.

Convex part

6d, 6e. Through hole 6f. The abutment section 7.

Side plates

7a, 7b, 7c, 7d. Through hole 8.

Side plates

8a, 8b, 8c, 8d. Through hole 9.

Lower frame

9a, 9b. Tap hole 10.

Upper frame

10a, 10b. Tap hole 10c. Reception surface 11. Pin 12. Pin 12a. Shaft part 13. Bearing 13a. Through hole 14.

Coil springs

14a, 14b.

Feet

15, 16, 17, 18. Screw 30. Space 51. Rotary blade 51a. Shank 51b. Spiral groove 51c. Wedge 52. Cutting edge 52a. Cutting edge line 53. Space 100. Strip material 100a. Edge 101,102. Band-shaped material 103,104. Material 110. Punch 110a. Punch surface 111. Dice 111a.

Placement surface

120, 130, 140. Reference molds 120a, 130a, 140a. Reference mold hole 121,131,141. Dependent molds 121a, 131a, 141a. Dependent mold hole X, Y. Center lines P, Q. Reference lines R, R ₂ . Dependent lines θ ₀ , θ ₁ , θ ₂ . Angles L ₀ , L ₁ , L ₂ . Separation distance Distance between axes α. Tilt angle

Claims

A rotary blade for cutting a sheet material, characterized in that a blade tip made of a strip-like material is formed in a spiral shape with a predetermined twist angle on the outer peripheral surface in the longitudinal direction of the shank.
The rotary blade for cutting a sheet material according to claim 1, wherein a twist angle of the blade edge is formed to be 45 degrees or less.
3. The rotary blade for cutting a sheet material according to claim 1, wherein a twist angle of the blade edge is formed to be 3 degrees or more and 10 degrees or less.
The rotary blade for cutting a sheet material according to any one of claims 1 to 3, wherein a ratio of thickness to width is 0.3 or less in a cross section perpendicular to the longitudinal direction of the strip-shaped material.
The sheet material according to any one of claims 1 to 4, wherein a ratio between a diameter of a rotation locus circle of the blade edge and a distance between both end points of the blade span is 0.07 or more and 0.1 or less. Rotary blade for cutting.
6. The blade edge is formed in a spiral shape by inserting the strip material into a spiral groove formed with a predetermined twist angle on the outer peripheral surface of the shank in the longitudinal direction. A rotary blade for cutting sheet material according to claim 1.
The rotary blade for cutting a sheet material according to claim 6, wherein a twist angle of the spiral groove corresponding to a range in which the cutting edge is cut is constant.
The sheet material cutting rotary blade according to claim 6 or 7, wherein the belt-like material has a spiral shape having a twist angle equivalent to that of the spiral groove in advance.
9. The sheet material cutting device according to claim 8, wherein the strip-shaped material has a lateral curve shape corresponding to a shape of a bottom locus of the spiral groove in the width direction in advance or at the same time as the spiral shape. Rotary blade.
The sheet material cutting rotary blade according to any one of claims 1 to 9, wherein the shank is cylindrical.
The method of manufacturing a rotary blade for cutting a sheet material according to any one of claims 1 to 10, wherein a cutting edge made of a band-shaped material is combined in a spiral shape with a predetermined twist angle, and the material is formed in a band shape to the twist angle. A method for producing a rotary blade for cutting a sheet material, characterized by processing into a strip-shaped material having a corresponding twisted shape, and combining the strip-shaped material in a spiral shape with the twist angle on the outer peripheral surface in the longitudinal direction of the shank.
The material is processed into a belt-shaped material having a predetermined transverse curve shape, the belt-shaped material is processed into a belt-shaped material having a twisted shape corresponding to the twist angle, and the belt-shaped material is formed on the outer circumferential surface of the shank in the longitudinal direction. The method for manufacturing a rotary blade for cutting a sheet material according to claim 11, wherein the rotary blades are combined in a spiral shape with a twist angle.
13. The method of manufacturing a rotary blade for cutting a sheet material according to claim 12, wherein a material that is a strip-shaped plate or wire is pressed from the width direction by a punch and a die to be processed into the strip-shaped material having the laterally curved shape. .
13. The method for manufacturing a rotary blade for cutting a sheet material according to claim 12, wherein a material that is a flat plate is processed into a strip-shaped material having the laterally curved shape by punching.
A reference mold hole and a sub mold hole that allow passage of a band-shaped material processed into a predetermined lateral curve shape in a band shape are disposed so as to have a predetermined angle corresponding to the twist angle, and The method for manufacturing a rotary blade for cutting a sheet material according to any one of claims 11 to 14, wherein the strip material is processed by passing the strip material through a reference mold hole and the dependent mold hole.
A reference mold hole and a sub mold hole that can pass through a material that is a strip-shaped plate or wire have a relative angle corresponding to the twist angle, and the center line of each hole is the spiral. It arrange | positions so that it may have a predetermined separation distance corresponding to a shape, and it processes to the said strip | belt-shaped material by letting the said raw material pass to the said reference | standard mold hole and the said subordinate mold hole. A manufacturing method of a rotary blade for cutting sheet material.
A reference mold hole and a sub mold hole that can pass through a material that is a strip-shaped plate or wire have a relative angle corresponding to the twist angle, and the center line of each hole is the spiral. It arrange | positions so that it may have a predetermined inclination angle corresponding to a shape relatively, and it processes to the said strip | belt-shaped material by letting the said raw material pass to the said reference | standard mold hole and the said subordinate mold hole. The manufacturing method of the rotary blade for sheet | seat material cutting | disconnection of Claim 2.
The rotary blade for cutting a sheet material according to any one of claims 1 to 10 and a fixed blade having a linear cutting edge are formed by combining blade edges made of a belt-like material in a spiral shape with a predetermined twist angle. A rotary cutter characterized in that the sheet material is cut by sequentially meshing with a shear angle.
The rotary cutter according to claim 18, wherein a shear angle formed by the rotary blade and the fixed blade is constant.