Blade Cover

Abstract

To provide a blade cover which is covered on a disk-like blade in a state of being attached to a slitter device.SOLUTION: A blade cover 1 comprises: an annular storage part 20 which is formed by combining a plurality of circular arc case portions 30 obtained by dividing a thick annulus ring into plural pieces in the circumferential direction, whose inner side edge is opened, has an internal space, and stores a disk-like blade 10 attached to a slitter device via a holder 11; and hinge-fasteners 40 which are provided on opposite ends of the adjacent case portions 30, 30, and have functions of a hinge that connects the case portions 30 and has a rotational shaft in the vertical direction with respect to a board surface of the blade 10 and a fastener that connects the case portions 30 in a detachable manner.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a blade cover that is placed over a disk-shaped blade attached to a slitter device. [Background technology]

[0002] Slitting machines are known that cut and rewind rolled foil or paper to a fixed width. These machines are equipped with multiple disk-shaped blades, which can potentially injure workers during maintenance or damage the blade edges with tools. However, until now, there has been no blade cover available to cover the disk-shaped blades attached to the slitter.

[0003] Other than slitter devices, blade covers for devices that use disc-shaped blades have been proposed, such as those in Patent Document 1. However, while the technology described in Patent Document 1 may be applicable as a blade cover for blades attached to the end of a shaft, it cannot be applied to blades attached to the middle of a shaft, such as in slitter devices. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-95908 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide a blade cover that is to be placed over a disk-shaped blade attached to a slitter device. [Means for solving the problem]

[0006] In order to solve the above problem, the blade cover according to the present invention comprises: A blade cover that covers a disk-shaped blade attached to a slitter device via a holder, comprises a plurality of arc-shaped case parts obtained by dividing a thick ring in the circumferential direction, combined together, having an inner edge that is open and an internal space, and an annular accommodation part that accommodates the blade, At the opposing ends of adjacent said case parts, there is a hinge-cum-fastener that combines the functions of connecting the case parts to each other, having a hinge with a rotation axis perpendicular to the disk surface of the blade, and removably connecting the case parts to each other, which is the gist of the invention.

[0007] Also, the blade cover according to the present invention, it is preferable that the accommodation part is fixed to the blade by abutting against the holder and the part of the blade other than the blade tip, so that the blade tip of the blade does not hit the wall of the internal space.

Advantages of the Invention

[0008] According to the blade cover of the present invention, since it can be easily put on and taken off from the disk-shaped blade attached to the slitter device, when performing maintenance or the like when the slitter device is not in use, it can prevent the operator from being injured, and also prevent tools from hitting the blade and damaging the blade.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments embodying the blade cover of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is of course not limited only to this. Regarding well-known technologies, detailed descriptions will be omitted.

[0011] First, the disc-shaped blade 10 attached to the slitter device will be briefly described with reference to FIG. 2. FIG. 2 is an explanatory diagram showing the relationship between the blade and the holder. FIG. 2(a) is a front view, and FIG. 2(b) is a cross-sectional view taken along line A-A. The blade 10 is a disc-shaped and donut-shaped thin blade, and a cutting edge is formed on the outer periphery. The cutting edge is a so-called single edge. In this specification, when referring to a blade, it shall refer to the entire disc-shaped blade. Also, the surface of the blade other than the cutting edge shall be referred to as the disc surface.

[0012] As shown in FIG. 2, the blade 10 is swingably mounted on the holder 11 using a coil spring 12, and the holder 11 is attached to the horizontal axis of a slitter device (not shown). That is, the blade 10 is attached to a slitter device (not shown) via the holder 11. The blade 10 is attached to a slitter device (not shown) such that the disc surface is perpendicular to the ground.

[0013] In this embodiment, it has such a configuration, but it is not necessarily the same. Any form in which the disc-shaped blade is mounted on the holder so as to protrude outside the holder can be used in the same way.

[0014] Next, the blade cover 1 according to the first embodiment will be described with reference to FIGS. 1 and 3 to 5. FIG. 1 is an explanatory view showing the blade cover in an open state. FIG. 3 is an explanatory view showing the blade cover in a closed state. FIG. 4 is an explanatory view showing the cross-sectional shape of the blade cover, where FIG. 4(a) is a front view and FIG. 4(b) is a cross-sectional view taken along line A-A. FIG. 5 is an explanatory view showing the cross-sectional shape of the state where the blade cover covers the blade, where FIG. 5(a) is a front view and FIG. 5(b) is a cross-sectional view taken along line A-A. FIG. 5 is an explanatory view showing the cross-sectional shape of the state where the blade cover covers the blade, where FIG. 5(a) is a front view and FIG. 5(b) is a cross-sectional view taken along line A-A. The blade cover 1 is to be put on the blade 10. The blade cover 1 mainly includes a housing portion 20 formed by combining two arc-shaped case portions 30, 30, and two hinge and fastener members 40, 40.

[0015] As shown in FIGS. 3 and 4, the housing portion 20 is a thick annular shape with an open inner edge and has an internal space so that the blade 10 can be accommodated. The cross-sectional shape of the internal space of the housing portion is substantially in the shape of the Chinese character "レ". In this embodiment, the shape of the internal space is like this, but it can be appropriately changed according to the blade 10 and the holder 11.

[0016] As shown in FIG. 5, the housing portion 20 is fixed to the blade 10 by abutting against the holder 11 and the disk surface other than the blade tip of the blade 10. Thus, the blade tip of the blade 10 does not hit the wall of the internal space and is not damaged. The housing portion 20 is configured to be substantially donut-shaped to cover the blade tip when attached to the blade 10.

[0017] The case portion 30 is an arc-shaped member obtained by dividing the housing portion 20 in the radial direction by a cut and dividing it into a plurality (two in this embodiment) in the circumferential direction. The case portion 30 is made of a synthetic resin such as polypropylene or polyaminotriazole, which is strong and has a certain degree of elasticity, and is integrally molded. In this embodiment, such a configuration is adopted, but the material and manufacturing method are not limited to this.

[0018] In this embodiment, the two case parts 30, 30 have the same shape, but they are a plurality of arc-shaped members obtained by dividing the accommodating part 20 in the circumferential direction. As long as they can be combined to form an annular accommodating part 20, they may have different shapes.

[0019] Also, in this embodiment, the opposing end parts of the case parts 30, 30 are in close contact, but they may be slightly separated. Also, the number of case parts may be two or more.

[0020] The hinge-cum-fastener 40 connects the opposing end parts of adjacent case parts 30, 30 and has both the function of a hinge whose rotation axis is perpendicular to the disk surface of the blade 10 and the function of a fastener that detachably connects the case parts 30, 30. Well-known techniques may be used for both the hinge and the fastener. Note that the function of the hinge only needs to be such that the case parts 30, 30 can open and close with respect to each other in the outer circumferential direction and the inner circumferential direction, and does not require a physical axis. For example, a leaf spring may be used.

[0021] As shown in FIG. 3, in this embodiment, shaft parts 41, 41 are respectively provided on the outer peripheral sides of the opposing end parts of the case parts 30, 30. The axial direction of the shaft parts 41, 41 is perpendicular to the disk surface of the blade 10. Then, the shaft parts 41, 41 are connected to each other by a locking part 43 provided with arc-shaped elastic holding pieces 42a, 42b that can elastically expand and contract to receive the shaft part 41 at one end part and the intermediate part of an elongated plate-like member (see FIG. 4).

[0022] The elastic holding piece 42a and the shaft part 41, and the elastic holding piece 42b and the shaft part 41 are fitted to each other and are pivotally supported so as to be rotatable relative to each other. Since the elastic holding piece 42a is provided at the end part 43a of the locking part 43 (see FIG. 6), it is not easily detached once it is fitted. Since the elastic holding piece 42b is provided at the intermediate part, it can be easily detached when a finger is applied to the other end part 43b. That is, the elastic holding piece 42b and the shaft part 41 are detachably connected.

[0023] When removing the blade cover 1 attached to a slitter device (not shown), the elastic holding pieces 42a and 42b are fitted to the shaft portions 41 and 41 so that the end portion 43b of the locking portion 43 is caused to move from top to bottom in the standing position where the removal operation is performed. Further, at the hinge-cum-fastener 40 (the side that serves as a hinge) on the side where the connection of the case portions 30 and 30 is not removed, the end portion 43b of the locking portion 43 can restrict the rotation range between the locking portion 43 and the case portion 30 (the end portion 43b can abut against the case portion 30 to prevent further rotation). Therefore, the length and shape of the end portion 43b may be changed so that the case portions 30 and 30 can be easily attached to or removed from the blade 10.

[0024] As described above, in this embodiment, the hinge-cum-fastener 40 includes the shaft portions 41 and 41 provided on the outer peripheral sides of the opposing end portions of the case portions 30 and 30, and the locking portion 43 provided with the elastic holding pieces 42a and 42b having an arc shape larger than a semi-circle that fits with the shaft portion 41.

[0025] In this embodiment, the hinge-cum-fastener has such a configuration, but it is of course not limited to this. For example, one end of a strip-shaped leaf spring (not shown) may be fixed to the outer peripheral side of one of the opposing end portions of the case portions 30 and 30, and a fastener (not shown) detachably connected to the other end of the leaf spring may be provided on the other side. As the fastener, a well-known technique may be used in which a joining hole having a plurality of cuts extending outward from the circumference is provided at the other end of the leaf spring, and a protrusion having a substantially spherical shape with a diameter substantially the same as that of the joining hole is provided at a corresponding location on the other case portion 30.

[0026] Alternatively, instead of using a leaf spring, a material hinge (not shown), that is, a member on the outer peripheral side of the end portion of the case portion 30 may be configured to serve as a hinge.

[0027] By using the hinge-cum-fastener 40, the case portions 30 and 30 can be removed at any position where the hinge-cum-fastener 40 is arranged. Therefore, compared with the case where one location is a hinge and one location is a fastener, it is particularly easy to remove the blade cover 1.

[0028] Note that in this embodiment, the number of the hinge-cum-fasteners 40 is two, but it may be three or more as long as it is up to the number of the case parts 30. Also, there may be four case parts, two hinge-cum-fasteners 40, and the remaining two may be hinges with only hinge functions.

[0029] Next, with reference to FIGS. 1 and 5 to 7, the state where the blade cover 1 is attached to the blade 10 will be described. FIG. 1 is an explanatory view showing the state where the blade cover is open. FIG. 5 is an explanatory view showing the cross-sectional shape of the state where the blade cover covers the blade, FIG. 5(a) is a front view, and FIG. 5(b) is a cross-sectional view taken along line A-A. FIG. 6 is an explanatory view showing the state where the blade cover is fixed to the blade. FIG. 7 is an explanatory view showing the state where the blade is accommodated in the accommodation part.

[0030] As shown in FIG. 1, the blade cover 1 is opened so as to separate around the hinge-cum-fastener 40 on the back side in the drawing with the hinge-cum-fastener 40 on the front side in the drawing removed. In this state, the case parts 30, 30 are put on so that the blade 10 attached to a slitter device (not shown) fits into the internal space of the accommodation part 20 (see FIG. 7). In the drawing, it is easier to first put on the upper case part 30 and then the lower case part 30. Then, as shown in FIG. 7, when the accommodation part 20 takes a complete form, as shown in FIG. 6, the end parts of the case parts 30, 30 are connected by the hinge-cum-fastener 40 (fitting the elastic holding piece 42b to the shaft part 41). Thereby, the blade cover 1 can be attached to the blade 10.

[0031] Note that when removing the blade cover 1 from the blade 10, the opposite operation may be performed.

[0032] When attaching the blade cover 1 to the blade 10, since it is put on in a form that sandwiches in the axial direction, the blade cover 1 can be attached to the blade 10 even when it is in a state of being mounted on the shaft.

[0033] The embodiments of the present invention have been described above, but the above-described content is only related to one embodiment of the present invention and does not mean that the present invention is limited to the above content.

Description of Symbols

[0034] 1 Blade Cover 10 Blades 11 Holder 20 Accommodation Part 30 Case Part 40 Hinge and Fastener 41 Shaft Part 42 Elastic Retaining Piece 43 Locking Part 43a End 43b End

Claims

1. A blade cover that covers a disk-shaped blade attached to a slitter device via a holder, comprising a plurality of arc-shaped case parts obtained by dividing a thick annular ring into a plurality in the circumferential direction, having an inner edge that is open and an internal space, and an annular accommodation part that accommodates the blade; At the opposing ends of adjacent case parts, there is a hinge-cum-fastener that combines the functions of connecting the case parts, having a hinge with a rotation axis perpendicular to the disk surface of the blade, and detachably connecting the case parts; and the accommodation part is capable of transitioning between a closed state in which the hinge-cum-fastener connects the case parts at all the opposing ends, and an open state in which the connection by the hinge-cum-fastener is not performed at any one of the opposing ends and the interval between the opposing ends widens; A blade cover, characterized in that the transition between the open state and the closed state is realized by the rotation of two adjacent case parts about the rotation axis of the part that functions as the hinge of the hinge-cum-fastener connecting the two case parts.

2. The blade cover according to claim 1, characterized in that in the open state, the blade cover is detachable from the disk-shaped blade attached to the slitter device via a holder.

3. The blade cover according to claim 1 or claim 2, characterized in that the accommodation part is fixed to the blade by abutting against the holder and a part of the blade other than the cutting edge, so that the cutting edge of the blade does not hit the wall of the internal space.

4. The blade cover according to claim 3, characterized in that the accommodation part is configured to abut against the holder inward in the radial direction of the accommodation part.

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