KR920007590B1 - Method for producing a rotary knife and clamp therefor - Google Patents

Abstract

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Description

Film Paper Cutting Equipment

1 is a view showing a configuration example of a conventional film paper cutting device, a is a partial cross-sectional structure diagram of the cutter shaft equipped with a flat plate knife cut into the ring, the counter side with a grooved knife, b is 1a Sectional drawing which shows the connection between a flat plate knife and a slotted knife in figure, c) is a partial enlarged view which shows the contact relationship between a flat plate knife and a slotted knife.

FIG. 2 is a diagram showing another configuration example of a conventional film paper cutting device, in which a to c are views corresponding to FIGS. 1 a to c, respectively.

3 is an explanatory diagram showing the principle of the present invention.

4 is a cross-sectional view of a clamp device having a plurality of round knives according to the present invention, showing the blade position when the one-dot chain line is operated.

FIG. 5 is a cross-sectional view of a clamp device including a cup spring in accordance with the present invention, corresponding to FIG.

6 is a cross-sectional view showing another embodiment of a clamp device including a cup spring.

* Explanation of symbols for main parts of the drawings

1: round knife 3: cutter shaft

5: ring 7: groove

9, 11: circumferential edge 13: Cup spring

15: thickness 17, 17 ': corner

19: slotted knife 21: counter cutter shaft

23: staircase 25: worm spring

27: concave round knife 28, 31, 33: contact point

d: small diameter D: large diameter

dsch: inner diameter Dtellerf: outer diameter

The present invention relates to a film paper cutting device.

Film paper cutting device is a device for cutting magnetic tapes such as thin coated plastic film. It consists of cutter shaft and counter shaft which are radially opposed and clamped in mutual axial direction. A slotted knife is attached to the There are two kinds of round knives used in such a cutting device.

For example, a flat round knife (DE-PS 2405849) is the same thickness of the whole knife, in particular made of a hard alloy. Such round knives have the advantage that they are easy to manufacture and only need to be reground radially. As another example, the plate-shaped concave round knife (DE-AS 2624875) has the advantage that the cutting shape shown in cooperation with the slotted knife is good, but it is expensive because it must be regrinded not only radially but also on both sides. Holding

These plate-shaped round knives or concave round knives polished into a plate shape are clamped by ring means for defining the spacing between the blades on the cutter shaft.

The ring is brought into close contact with the entire surface within its inner diameter range, and the round knife is inserted between the grooves or recesses between the rings, and is elastically compressed to the color formed on the groove wall by a cup spring or washer-shaped worm (spring). [See Figures 1a and 2a]

The spring is standardized so as to be able to squeeze the round knife against the groove wall as a fixing member as a whole, and is slightly lifted up from the groove wall. It is clamped in the axial direction against each other.

In this case, in particular, flat round knives result in poor cutting geometry due to the negative cutting angle which affects the contact point and cutting shape of both blades (see also Figure 1c).

SUMMARY OF THE INVENTION An object of the present invention is to provide a film paper cutting device that combines the advantages of a flat plate-shaped knife that is easy to manufacture, long-lived, and requires only simple radial re-polishing, and a dish-like or concave-round knife regarding the cutting method. .

The apparatus of the present invention is characterized in that the flat plate-like knife is deformed into a plate by only being clamped between two rings that exert forces in circumferential directions of different diameters on both sides of the round knife on the cutter axis.

At first, a conventional round knife, which is flat on a plate, only has the advantage of a round knife polished in a cup or dish shape when clamped on a cutter shaft, that is, a hard alloy round knife can be easily manufactured and integrally combined. It is convenient to re-grind the plurality of blades radially, and it is possible to obtain a good cutting shape by the positive cutting angle, and even extension of the service life and accurate cutting quality.

In the device of the present invention, the deformation into the dish shape can be brought about within the elastic range of the round knife by appropriately selecting the pressing force.

Tightening and deformation of this flat round knife can only be done by ring means which are pressed and clamped together on the cutter shaft to support the knife.

To this end, the ring is formed such that its front side can exert pressure along the circumference of the different diameter on each side of the round knife.

In addition, the plate-shaped deformation of the flat plate-like knife can be similarly performed by holding a cup or plate-shaped spring applied with the round knife.

In this case, the springs are inserted between the mutually compressed rings on the cutter shaft. The pressure of the spring and the thickness of the round knife must be balanced so that the round knife can be in the form of a plate or cup by elastic deformation.

Hereinafter, embodiments of the present invention will be described in detail as a comparison with the known art according to the drawings.

1a, b and 2a, b show a known cutting device. The flat circular knife 1 and the regrinded concave circular knife 27 are supported by the cutter shaft 3, respectively. The flat round knife 1 is installed between the rings 5 and is pressed toward the front of the adjacent ring 5 as the cup spring 13 is inserted.

In operation, the round knife 1 and the slotted knife 19 mesh with each other, and the cutter shaft 3 is axially biased with respect to the counter cutter shaft 21.

Until recently, the cup springs and round knives have been harmonized so that the round knives 1 are supported as a whole by being processed out of the pressing surface of the ring 5.

In the case of the boundary line, as shown by the contact point 29 between the side of the cutter shaft upper knife 1 and the cutting blade of the slotted knife 19, the first blades are in a mutually unfavorable position.

FIGS. 2A-C, which correspond to FIGS. 1A-C, illustrate a cutting device comprising a concave round knife 27 squeezed into the support jaw by the worm spring 25.

As shown in Figs. 2B to C, the concave round knife 27 in operation is lifted by a blade contact surface as a whole. Nevertheless, these round knives 27 remain in the desired positions with respect to the slotted knives 19 (contact points 31 and 33).

3 shows a principle based on the present invention.

The flat plate-like knife 1 deforms into a dish shape when pressure is applied along each circumferential line belonging to the small diameter d and the large diameter D of different diameters on both sides thereof.

Here, the pressing force, the material of the blade, and the deformation or deformation of the blade are considered so that the round knife can be restored to a flat form as soon as it disappears.

This method has the advantage that radial regrinding can be performed by using all of the adjacent round knives.

4 shows only a clamping device in which the round knife 1 is deformed into a dish or cup-like form by the rings 5 being pressed together.

In this embodiment, the ends of all the rings 5 are formed in the same shape. The circumferential edges 9 and 11 each having a small diameter d and a large diameter D cause elastic deformation of the flat round knife.

The width and depth of the groove 7 are selected so that the deformation of the flat circular knife 1 is free. The exact deformation of the required round knife 1 can be obtained according to the dimensions of the circumferential edges 9, 11.

The dotted line in FIG. 4 shows the cooperative relationship between the round knife 1 and the slotted knife 19 in the operating state.

This indicates that the round knife 1 remains in contact with the circumferential edges 9 and 11 in order to make good cooperation with the slotted knife 19 as in the concave round knife shown in FIG. 2C. Of course, the plate-shaped deformation | transformation part of the round knife 1 may be loosened by clamping to the cutter shaft 3 and the counter cutter shaft 21 axially.

5 shows a flat plate 1 with a flat blade 1 by appropriately matching the thickness 15 of the round knife 1 (see FIG. 3) with the pressure relationship between the cup spring 13 having a relatively large outer diameter Dtellerf. Another embodiment of transforming into a mold is shown.

The stepped shape of the ring 5 according to FIG. 5 can additionally obtain an accurate support system for clamping the round knife 1 by the ring 5 on the cutter shaft 3 and the cup spring 13. .

In the case of the clamp device shown in FIG. 1A, the ring 5, the round knife 1, and the cup springs 13 are aligned in a line, so that the round knife 1 is placed between the rings 5 even if it is slightly neglected. This results in the rings 5 not coming into uniform contact with each other.

In contrast, in the present embodiment, when the ring 5 is loosely assembled, the round knife 1 concentrates stably at the steps of the ring 5 of the inner diameter dsch, and the cup spring 13 is similarly the inner diameter side thereof. It concentrates into the staircase 23 of this adjacent ring 5.

The inner knife is supported by the edge 17 of the ring 5, and the round knife 1 is deformed into a cup or a dish by pressing the outer diameter side by the pressure applied by the outer end of the cup spring 13 on the opposite side.

The dotted line in Fig. 5 shows the operating state.

6 shows a ring 5 with two edges 17 and 17 '.

The advantage of this structure is that the inclination of the round knife surface can be determined as the edges 17 (17 ') which are appropriately stepped.

The elasticity of the outer edge portion of the round knife 1 is maintained by the round knife 13 which is radially supported on the relatively far inside. The outer diameter of this round knife 13 is arranged in accordance with a large outer diameter Dtellerf so that the round knife 1 can protrude. In this way the protrusion of the outer edge of the round knife is elastically deformed (see dashed lines in FIGS. 4 and 5).

The apparatus of the present invention is generally suitable for cutting thin sheets or film papers, and in particular has the advantage of cutting thin films coated with magnetic material for producing magnetic tapes.

For example, a tape of excellent cutting edges can be obtained, and the service life of the hard alloy round knife 1 and the slotted knife 19 becomes long. The regrinding of the round knife 1 and the slotted knife 19 only requires radial regrinding, so the work is easy.

Meanwhile, as a preferred embodiment, the round knife and the slotted knife may be made of a particulate alloy which can be purchased from Leiko of Germany, Mitsubishi of Japan or Sandwick of Sweden, wherein the thickness of the round knife is It is good to set it as 0.4-0.5 mm.

Claims (10)

The axial forces Fd, which are replaceably positioned in the ring 5 of the cutter shaft 3 and which are completely flat in the unmounted state and act in opposite directions on the circumferences of different diameters d and D in the mounted state, A film paper cutting device consisting of one or more inherently elastic and thin rounded knives (1), deformed into a plate by FD), characterized in that the rounded knives (1) are kept elastic at their outer edges. Film paper cutting device. 2. The groove (7) according to claim 1, wherein a groove (7) is formed in two adjacent rings (5) on which the inner edge of the round knife (1) is mounted, and the circumferential edge (17) of the groove (7) One side of the round knife is supported, and the opposite side of the round knife is supported by the second circumferential edge 11 located at the radially outer portion of the circumferential edge 9, the elasticity of the round knife being the outer edge A film paper cutting device, characterized in that the outer edge portion of the round knife protrudes from the second circumferential edge (11) to such an extent that it is held in the portion. The corner 17 of the groove 7 according to claim 1, wherein a groove 7 is formed by two adjacent rings 5 on which the inner edge of the round knife 1 is mounted. The groove 7 is formed by the inner edge of the circular knife 1 is mounted by the cup spring 13 on the outer side of the radial circular knife 1 of the corner 17 of the groove 7. The outer edge (> DTellerf) of the round knife 1 protrudes from the cup spring 13 so that pressure is applied in the opposite direction and the elasticity of the round knife 1 is maintained at the outer edge. Film paper cutting device, characterized in that. 4. The film paper cutting device according to claim 3, wherein a stepped edge (17) (17 ') is formed on one side of the ring (5), so that the deformation slope of the back knife (1) can be proposed. The inner diameter of the cup spring (13) according to claim 3, wherein the cup spring (13) has an outer diameter (Dtellerf) larger than the inner diameter (dsch) of the round knife (1), and is described on the other side of the ring (5). Film paper cutting device, characterized in that the staircase 23 is formed. 2. The round knife (1) according to claim 1, wherein a plurality of round knives (1) are arranged on the cutter shaft (3), and a corresponding number of grooved knives (19) are arranged on the counter cutter shaft (21). And a slotted knife 19 for cooperating with each other. The method according to claim 6, wherein when the cutter shaft (3) with the round knife (1) attached and the cutter shaft (21) with the grooved knife (19) are engaged in the axial direction, the round knife (1) has a plate shape. The film paper cutting device, characterized in that the cooperative operation between the knife can be arbitrarily maintained. 8. The film sheet cutting device according to claim 7, wherein the round knife (1) and the slotted knife (19) are made of a hard alloy. The film paper cutting device according to claim 8, wherein the thickness (14) of the round knife (1) is 0.4 to 0.5 mm. 5. The groove (7) according to claim 4, wherein a groove (7) on which the inner edge of the round knife (1) is mounted is formed by two adjacent rings (5) and is rounded by the edge (17) of the groove (7). One side of the knife is supported, the pressure by the cup spring 13 is applied in the opposite direction to the outer side of the radial round knife 1 of the edge 17, the elasticity of the round knife 1 is external Film cutting device, characterized in that the outer edge (> 3 DTellerf) of the round knife (1) protrudes from the cup spring (13) to the extent that it is held at the edge.

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