JPH10217185A - Web cutting method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide long-life cutting blades for web, which consist of a tray- shaped round blade and cup-shaped round blades and present a sharp taste of cutting by improving the upper blade of a conventional construction. SOLUTION: The web cutting method and device according to the present invention include a tray-shaped round blade 11D and cup-shaped round blades 21A and 21B to serve also as transport roller for a web which is wound on them, and a web formed on a support or structured so that a coating film is applied to a support, is cut into a specified width by these blades while the cutting edge of the tray-shaped round blade 11D is pressed to the cutting edges of the cup-shaped blades 21A and 21B resiliently in an axial direction in a slightly inclined condition and rotation is generated with two places at the periphery of the blade tip put in contacting oppsitely with each other, wherein the cutting is conducted in a condition that a flat plane having a width of 0.03-0.5mm perpendicular to the center axes of the tray-shaped blade and cup- shaped blades is/are provided on the upper blade or both of the upper and lower blade peripheral blade tips positioned opposingly or contacted with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a cutting method and a cutting apparatus for cutting a support or a web coated with a coating material such as an emulsion or "magnetic paint" on the support to a predetermined width.

[0002]

2. Description of the Related Art For the sake of simplicity, a dish-shaped round blade and a bowl-shaped round blade used in the present invention are hereinafter referred to as an upper blade and a lower blade, respectively, in accordance with their usual names, and both are referred to as upper and lower blades. It may be called.

[0003] The upper and lower blades used when cutting a magnetic layer tape such as a photographic film such as 135 film or X-ray film or a video tape such as a video tape into a fixed width generally have the following shapes.

Conventionally, the upper blade 1, as shown in FIG. 3, the upper blade 11A of the relief angle theta _A is attached to the inside with respect to the axis perpendicular plane including the upper blade peripheral circle, FIG. 2 are known and upper blade 11B which is the relief angle theta _a as shown in FIG. 4 is 0 °.

Further, the lower blade 1, as shown in FIG. 4, and the lower blade 21A which relief angle theta _B are attached inwardly to the axis perpendicular plane including a lower blade outer peripheral circle, FIG. 2 It is known and the lower blade 21B which is relief angle theta _B as shown in FIG. 3 is 0 degrees.

The upper blade and the lower blade are combined with each other to provide cutting means as shown in the sectional views of FIGS.

[0007]

In the conventional cutting blade, the upper blade 11A is elastically attached to the upper blade shaft by a coil spring, a disc spring, or the like via an upper blade holder. As shown in the perspective view of FIG. 5, the outer circumference of the upper blade 11A and the lower blade 21A or 21B are in a state where the tips of the blade edges are opposed to each other at two locations A and B, and the film is pressed. The cutting point coincides with one of the two contact points A and B of the upper and lower blades. At that time, if the surface roughness of the upper and lower blades is sharpened by sharpening the surface roughness of the upper and lower blades for the purpose of improving the sharpness of cutting, if the surface roughness is reduced to a certain level or less, the upper and lower blades will be There has been a problem that the upper edge of the upper blade has a tendency to be shaved by the lower blade, and the sharpness of the upper blade, which is particularly thin and weak in strength, tends to be sharpened by the lower blade.

In the upper blade 11B, unlike the upper blade 11A, as shown in the perspective view of FIG. 6 and the side view of FIG. 7 and the front view of FIG. The leading end overlaps L ₀ from the cutting edge of the upper blade 11B to the center.
There is no contact between the upper and lower cutting edges at the cutting point K, and the cutting edge is not scraped.
Therefore, the upper blade 11B can maintain a relatively long life. However, the side surface of the upper blade 11B is in continuous contact with the cut film, and the upper blade 11B is pressed in order to suppress the change in the clearance C ₀ at the upper and lower outer peripheral cutting points K due to the slight run-out of the film during cutting. It is necessary to keep the contact pressure high. This tends to increase the friction between the film and the upper blade 11B, so that cutting powder is likely to be generated, or the life of the lower blade 21A or 21B tends to be shortened. Further, since the contact point S and the cutting point K on the outer peripheral portion of the upper and lower blades do not coincide with each other, a small clearance is formed between the upper and lower blades at the film cutting point where the upper blade and the lower blade intersect. In some cases, a whisker-like cutting waste was easily generated.

As described above, the present invention improves the conventional upper blade 11A or 11B to provide a cutting blade which is sharper and has a longer service life and also improves the lower blade so that high quality cutting can be performed. An object of the present invention is to provide a cutting method and a cutting device that can be maintained for a long time.

[0010]

This object is achieved by the following technical means (1) or (4).

(1) A dish-shaped round blade in which a support or a web having a coating film formed on the support is formed in a cone shape with a clearance angle inside the cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle. And a bowl-shaped round blade wound around the web and also serving as a transport roller for the web, elastically pressing the blade of the dish-shaped round blade against the blade of the bowl-shaped round blade in its axial direction. A cutting method for cutting the web to a predetermined width while rotating the two positions of the outer circumference of the blade edge while facing each other in a slightly inclined state, wherein the web is perpendicular to a central axis of the dish-shaped round blade. A flat surface having a width of 0.03 to 0.5 mm in the radial direction of the dish-shaped round blade is provided on the peripheral edge of the dish-shaped round blade that abuts against and reduces the clearance angle of the edge.
A web cutting method, wherein the web is cut at a time.

(2) A dish-shaped round blade in which a support or a web on which a coating film is formed on the support is formed such that a clearance angle is formed inside the cutting edge with respect to a plane perpendicular to the axis including a cutting edge circle. And a bowl-shaped round blade having a clearance angle of a cutting edge on the inner side with respect to a plane perpendicular to the axis, and the blade of the dish-shaped round blade is used as the bowl. A cutting method in which the web is cut into a predetermined width while rotating the two edges on the outer periphery of the blade edge in a state of being slightly pressed and elastically pressed against the blade of the round blade in a state of being slightly inclined. And a dish-shaped round blade that abuts a smooth flat surface having a width of 0.03 to 0.5 mm in the radial direction of each round blade perpendicular to each central axis of the dish-shaped round blade and the bowl-shaped round blade; A web provided at an outer peripheral edge of a bowl-shaped round blade, wherein the relief angle of the edge is set to 0 degree and the web is cut. Cutting method.

(3) A dish-shaped round blade in which a support or a web on which a coating film is formed on the support is formed such that a clearance angle is formed inside the cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle. A bowl-shaped round blade wound around the web and also serving as a transport roller for the web; rotating shafts provided in parallel with each other to set and rotate both round blades concentrically; and the blade of the dish-shaped round blade Means for elastically pressing the blade in the axial direction thereof against the blade of the bowl-shaped round blade, and cutting the web to a predetermined width while rotating the two outer peripheral edges of the blade edge while facing each other. A flat surface having a width of 0.03 to 0.5 mm in a radial direction of the dish-shaped round blade perpendicular to a center axis of the dish-shaped round blade, and a flat surface of the dish-shaped round blade having a flat surface opposed thereto. A web cutting device, which is provided.

(4) A dish-shaped round blade in which a support or a web on which a coating film is formed on the support is formed such that a clearance angle is conically formed inside a cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle. And a bowl-shaped round blade wound with the web and also serving as a transport roller for the web, and having a clearance angle of a cutting edge on an inner side with respect to a plane perpendicular to the axis,
A rotating shaft provided in parallel with each other to set and rotate both round blades concentrically, and means for elastically pressing the blade of the dish-shaped round blade against the blade of the bowl-shaped round blade in the axial direction thereof. A cutting device for cutting the web to a predetermined width while rotating the two positions of the outer periphery of the cutting edge so as to oppose each other, and cutting the web to a predetermined width with respect to each central axis of the dish-shaped round blade and the bowl-shaped round blade. A flat surface having a width of 0.03 to 0.5 mm in the radial direction of each of the vertical round blades is provided on an outer peripheral edge of the dish-shaped round blade and the bowl-shaped round blade which are in contact with each other; Cutting device.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present inventor has analyzed the combination of the upper blade and the lower blade of a conventional cutting device as follows, and has invented a cutting device and a cutting method using a new cutting blade.

In FIG. 8, when the radius of the edge of the upper blade 11B is R, the radius of the edge of the lower blade 21A or 21B is r, the contact point of the upper and lower blades is S, and the film cutting point is K, the arc KS is the upper edge. corners put in 11B the central axis of the theta _1, when arc KS corners a and theta ₂ tensioning the central axis of the lower blade 21A or 21B, the upper and lower blade offset amount l, the amount of overlap vertical blades was L ₀ The following equation holds.

C ₀ = l × (r−rcos θ ₂ ) / RL ₀ = (r−rcos θ ₂ ) + (R−Rcos θ ₁ ) When r ≒ R, L ₀ = 2 (r−rcos θ ₂ ) = 2 ( R-Rcos θ ₁ ) C ₀ = 1L ₀ / 2R In the present invention, the upper blade part side sectional view of FIG. 9 and FIG.
The upper blade 11D shown in the front view of the upper blade 11A is a portion where the upper blade of the conventional upper blade 11A is in contact with the lower blade and the clearance angle θ _A
And the width L _{1, which} is smaller than the overlap amount L ₀ of the upper and lower blades, of about 0.03 to 0.5 mm,
A smooth plane perpendicular to the rotation axis was set so that the tip of the upper blade tip did not contact the tip of the lower blade tip. Therefore, even if the surface roughness of the upper and lower blade edges is made fine, damage due to shaving of the upper and lower blade edges in the initial stage of use can be prevented, and the conventional clearance angle θ
_The sharpness could be improved compared to the upper blade 11A with only _A. That is, the contact points A and B of the upper and lower blades are set to A '.
The angle which moves to point B 'and extends to the center axis of the lower blade is also θ ₂
To θ ₂ ′. Since the width L ₁ of the smooth surface in the radial direction is 0.03 to 0.5 mm and L ₁ ≪L ₀ , the clearance C ₁ between the upper and lower blades is C ₁ ≒ L ₁ / 2R≪L _0. / 2R = C ₀ become.

Further, as compared with the conventional type having no clearance angle, that is, the upper blade 11B of θ _A = 0, the distance between the film cutting point A and the contact point A ′ of the upper and lower blades can be remarkably reduced, so that the film cutting is performed. clearance C ₁ between the upper and lower blades at the point can be very narrow as compared with the upper blade 11B of the conventional, even whisker-like cuttings could be obtained good sharpness hardly occurs. In addition, the clearance C between the upper and lower blades
_{With 1, the} wear of the upper blade edge hardly occurred, and the long life was easily maintained.

That is, the continuous contact between the upper blade side surface and the film in the method and apparatus of the present invention can be extremely smaller than that of the conventional upper blade 11B as in the case of the conventional upper blade 11A.
Film cutting powder is hardly generated. In addition, the synergistic effect that the contact pressure of the upper blade 11D in the method and the apparatus of the present invention can be set relatively low, and that the lower blade comes into contact with the upper blade side surface at an obtuse angle close to a plane. By
Since the wear of the lower blade 21A or 21B can be prevented more than when the conventional upper blade 11A or 11B is used, the life of the lower blade can be extended.

The width L _{1 in} the radial direction of a smooth plane provided perpendicularly to the rotation axis on the outer periphery of the cutting edge corresponds to the thickness L of the film to be cut and the overlap amount L ₀ of the upper and lower blades required from the standpoint of cutting machine performance. determining Te, but must be smaller film thickness is thin vertical blades overlap amount L ₀ is narrow it is needless to say that it is necessary to set the width L ₁ of the smooth surface accordingly.

Further, a smooth surface perpendicular to the lower blade rotation axis having a width of about 0.03 to 0.5 mm is set on the outer peripheral cutting edge portion having the clearance angle θ _A, and the upper blade 11D described above is further mounted. By using, the upper blade 11D is used and the lower blade is 21A, 2
As in the case of the above-described method 1B, it was confirmed that the service life of the blade tip was prolonged.

In addition, a width of 0.03 to
When a smooth surface perpendicular to the lower blade rotation axis is set to 0.5 mm and the upper blade is of the conventional 11A or 11B type, a slight improvement is seen compared to the conventional blade, but it is notable. Was not.

[0023]

According to the present invention, it is possible to reduce the generation of whisker-like debris as compared with the prior art, and to achieve sharp cutting, and to prolong the life of the tips of the upper blade and the lower blade in the method and apparatus of the present invention. Was completed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 2 is a sectional view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 3 is a sectional view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 4 is a sectional view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 5 is a perspective view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 6 is a perspective view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 7 is a side view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 8 is a front view showing an example of a combination of a conventional dish-shaped round blade and a bowl-shaped round blade.

FIG. 9 is a partial sectional side view showing the shape of the blade edge of the dish-shaped round blade of the present invention.

FIG. 10 is a front view showing an example of a combination of a dish-shaped round blade and a bowl-shaped round blade according to the present invention.

[Explanation of symbols]

 11A, 11B Dish-shaped round blade (upper blade) 11D Dish-shaped round blade (upper blade) 21A, 21B Bowl-shaped round blade (lower blade) A, A ', B, B' Upper and lower blade contact points

Claims (4)

[Claims] 1. A dish-shaped round blade having a relief angle conically formed inside a cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle, comprising: a support or a web having a coating film formed on the support; By winding the web and using a bowl-shaped round blade also serving as a transport roller for the web, the blade of the dish-shaped round blade is elastically pressed against the blade of the bowl-shaped round blade in its axial direction. A cutting method for cutting the web to a predetermined width while rotating the two positions of the outer periphery of the blade edge while facing each other in a state inclined at a predetermined angle,
A flat surface having a width of 0.03 to 0.5 mm in the radial direction of the dish-shaped round blade perpendicular to the center axis of the dish-shaped round blade is provided at the peripheral edge of the dish-shaped round blade facing and abutting, and the A method for cutting a web, wherein the cutting angle is set to 0 degree. 2. A dish-shaped round blade having a relief angle conically formed inside a cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle, comprising: a support or a web having a coating film formed on the support; The dish of the dish-shaped round blade is formed by using a bowl-shaped round blade, which is wound around the web and also serves as a transport roller of the web, and has a clearance angle of a cutting edge on the inner side with respect to a plane perpendicular to the axis. A cutting method in which the web is cut into a predetermined width while rotating the two edges on the outer periphery of the cutting edge in a state of being elastically pressed against the blade of the round blade in the axial direction and tilted at a predetermined angle while rotating the two edges facing each other. And a dish-shaped round blade that abuts a smooth flat surface having a width of 0.03 to 0.5 mm in the radial direction of each round blade perpendicular to each central axis of the dish-shaped round blade and the bowl-shaped round blade; The web is characterized in that the cutting edge is provided at the outer edge of the bowl-shaped round blade, and the clearance angle of the edge is set to 0 degree. Cutting method. 3. A dish-shaped round blade having a relief angle conically formed inside a cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle on a support or a web having a coating film formed on the support. A bowl-shaped round blade wound around the web and also serving as a transport roller for the web;
A rotating shaft provided in parallel with each other to set and rotate both round blades concentrically, and means for elastically pressing the blade of the dish-shaped round blade against the blade of the bowl-shaped round blade in the axial direction thereof. A cutting device for cutting the web to a predetermined width while rotating the outer periphery of the cutting edge at two locations facing each other, wherein the cutting edge is perpendicular to a central axis of the dish-shaped round blade. 3. A web cutting device, wherein a smooth flat surface having a width of 0.03 to 0.5 mm in the radial direction is provided at a peripheral edge of a dish-shaped round blade that abuts against each other. 4. A dish-shaped round blade having a relief angle conically formed inside a cutting edge with respect to a plane perpendicular to an axis including a cutting edge circle, wherein the support or a web having a coating film formed on the support is formed. A roll-shaped round blade having a clearance angle of a cutting edge on the inner side with respect to a plane perpendicular to the axis, which also serves as a transport roller for winding the web, and both round blades are set concentrically and rotated to be parallel to each other. And a means for elastically pressing the blade of the dish-shaped round blade in the axial direction thereof against the blade of the bowl-shaped round blade,
A cutting device that cuts the web to a predetermined width while rotating the two positions of the outer periphery of the blade edge while facing each other,
A dish-shaped round blade and a bowl-shaped circle in which a smooth plane having a width of 0.03 to 0.5 mm opposes in a radial direction of each round blade perpendicular to each central axis of the dish-shaped round blade and the bowl-shaped round blade. A web cutting device provided on an outer peripheral edge of a blade.