JP7237348B2 - Roll holder - Google Patents

Description

The present invention relates to a roll holder.

Conventionally, various techniques have been proposed regarding roll holding discs for banding. For example, the roll product protector described in Patent Document 1 below is a protector for transporting and storing a roll product formed by winding a wide belt-like product around a hollow core, and has a rectangular shape that presses the end surface of the roll product with the back surface. and a cylindrical portion projecting from the center of the back surface of the substrate portion so as to be insertable into the hollow hole of the hollow core of the roll product. a cylindrical part for supporting a product, a stacking leg formed of a tubular body having a triangular cross-sectional shape and protruding from a square back surface of the board, and a surface of the board so that the tip of the leg can be inserted. A hard synthetic resin molded body comprising a square recessed portion for stacking, wherein each side length of the substrate portion is longer than the outer diameter of the roll product, and the leg length of the leg portion is the above-mentioned It is characterized in that it is longer than the entire length of the cylindrical portion. Moreover, if a packing band groove is provided in the center of each side surface of the substrate portion, it is possible to prevent collapse of cargo during transportation and storage.

In order to apply the above-configured protector to a roll product, both end surfaces of the roll product are pressed and sandwiched by the back surface of the substrate portion of a pair of protectors, and the cylindrical portion is inserted into the hollow hole in the hollow core of the roll product to roll the product. The product is supported, and if necessary, two packing bands are applied crosswise to the band grooves to tighten the whole. This work is easy because the substrate portion and the cylindrical portion are integrally formed. When the roll product to which the protector is applied in this way is stacked horizontally, the lower surface of the board portion and the leg portion of the upper protector rests on the upper surface of the corresponding board portion and leg portion of the lower protector. Therefore, even if the roll products are slightly misaligned in the horizontal direction, there is no risk of collapse. Unused protectors should be stacked for transportation and storage. At this time, the tips of the legs of the upper protector are inserted into the recesses provided on the surface of the substrate portion of the lower protector, and if necessary, a packing band is applied to the band groove to tighten the whole. As a result, the protectors are prevented from being displaced from each other, thereby preventing the load from collapsing. It should be noted that the protector is made of a hard synthetic resin, so it is highly durable.

Registered Utility Model No. 2604907

However, when the packing band is hung on the band groove for tightening the whole, there is a possibility that the corner portion of the substrate part in the band groove is worn out. In addition, there is a possibility that the corner portion of the substrate portion inside the band groove may be deformed and damaged by the packing band.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a roll holding disc that prevents damage to the band hooking portion and abrasion of the band.

The invention according to claim 1 made to solve this problem is a roll holding plate, which is provided at a substantially center of the flat plate portion facing the end side plane of the roll-shaped object to be held, a core material supporting portion that supports a core material of an object to be held; a side wall portion that extends in the thickness direction of the flat plate portion to form a peripheral surface of the flat plate portion; a recess that is recessed from the flat plate portion in the thickness direction of the flat plate portion; The concave portion includes a band hooking portion on which a band is hooked, and the concave portion includes a concave side wall substantially parallel to the thickness direction of the flat plate portion, a concave bottom wall connected to the concave side wall on the side of the end surface of the concave side wall, and the concave side wall and the concave bottom wall. The recess side wall includes a recess facing wall facing the side wall and a recess connecting wall connecting the recess side wall and the recess facing wall, The band hooking portion is characterized by comprising a side wall of the recess, a bottom wall of the recess, and a curved surface portion.

The invention according to claim 3 is the roll holding plate according to claim 1 or claim 2 , wherein the side wall of the recess includes a wall that also serves as a recess that is a part of the side wall, and the recess is an end surface of the wall that also serves as the recess. Alternatively, it is characterized by being recessed in the thickness direction of the flat plate portion up to the vicinity of the end face.

The invention according to claim 5 is the roll holding disk according to any one of claims 1 to 4 , wherein the flat plate portion is on the side opposite to the side facing the end side plane of the object to be held. A lattice rib erected in a lattice shape on the outer surface, a circular rib erected substantially in the center of the outer surface, and a part of the lattice rib that extends between the circular rib and the wall facing the recess. and connecting ribs.

The invention according to claim 6 is the roll holding disk according to any one of claims 1 to 5 , wherein the leg provided along the thickness direction of the flat plate is provided at the corner of the flat plate. A part of the leg is a connecting wall of the recess.

In the roll holding discs of the inventions according to claims 1, 2, and 4 , when a roll-shaped object to be held is held, the end side plane of the object to be held is opposed to the flat plate portion, and the core member A band is applied to the band applying portion while the core material of the object to be held is supported by the supporting portion. The curved surface portion forming the band hooking portion is a relatively large curved surface projecting outward from the concave portion, with which the hooked band is pressed. As a result, the roll holding disc according to the first, second and fourth aspects of the present invention prevents the band hooking portion from being damaged and the band from being worn out.

In the roll holding disk of the invention according to claim 3 , the side wall of the concave portion is provided with a wall that also serves as a concave portion that is a part of the side wall portion. is easy.

In the roll holding disk according to the first aspect of the invention, the recessed side wall formed with the curved surface portion constituting the band hooking portion has a recessed portion facing wall facing the side wall portion, and a recessed portion connecting wall connecting the recessed portion side wall and the recessed portion facing wall. with walls. Accordingly, in the roll holding disc according to the first aspect of the invention , the strength of the banding portion is increased, so that even if a force is applied by the banding, it is less likely to be deformed or damaged.

In the roll holding disk according to the fifth aspect of the invention, the lattice ribs, the circular ribs, and the connecting ribs provided on the outer surface of the flat plate portion further increase the strength of the banding portion, so that the banding portion is deformed or damaged. hard to do

In the roll holding disk according to the sixth aspect of the present invention, at the corner of the flat plate portion, the recess connecting wall is a part of the leg provided along the thickness direction of the flat plate portion. Therefore, even if a force acts on the band hooking portion when the band is hooked, the force is dispersed to the leg portion via the recess connecting wall. Therefore, in the roll holding disc according to the sixth aspect of the invention, deformation of the banding portion is suppressed.

FIG. 4 is a perspective view showing a state in which an object to be held is held by the roll holding disc of the present embodiment; It is the perspective view in which the flat plate part of the same roll holding|maintenance board was represented. It is the perspective view in which the flat plate part of the same roll holding|maintenance board was represented. It is the perspective view in which the outer surface of the flat plate part of the same roll holding|maintenance disk was represented. 5 is an enlarged view showing frame A of FIG. 4; FIG. It is the top view in which the outer surface of the flat plate part of the same roll holding|maintenance board was represented. It is the top view in which the flat plate part of the same roll holding|maintenance disk was represented. It is the perspective view in which an example of the state which used the same roll holding|maintenance disk by stacking|stacking was represented. FIG. 9 is a perspective view showing an example of a state of use of the same roll holding plate, taken along a line corresponding to line CC in FIG. 8; 9. It is the figure which represented the cross section which cut|disconnected the roll holding|maintenance board in the state of use of FIG. 9 by the line corresponding to line CC of FIG. It is the perspective view represented in the state in which the same roll holding|maintenance board was piled up. 11. It is the figure which represented the cross section which cut|disconnected the same roll holding disc in the stacked state of FIG. 11 by the line EE of FIG. It is the perspective view in which the example of a change of the same roll holding|maintenance board was represented.

BEST MODE FOR CARRYING OUT THE INVENTION A roll holding disk according to the present invention will be described below based on a specific embodiment with reference to the drawings.

As shown in FIG. 1, the roll holding disc 1 of the present embodiment holds a roll-shaped holding object 100 in a paired state sandwiched from the end side flat surface 102, and is made of resin such as polypropylene. It is molded by using the material. The object to be held 100 is obtained by winding, for example, a film around a cylindrical core material 104 . The core material 104 protrudes from the end-side flat surface 102 in the object to be held 100 .

1 to 4, 8 to 11, and 13, the direction indicated by D indicates the thickness direction of the flat plate portion 10, which will be described later.

As shown in FIGS. 2 and 3, the roll holding disk 1 of this embodiment includes a flat plate portion 10, a core support portion 20, leg portions 30, side wall portions 40, concave portions 50, and the like. The flat plate portion 10 has a substantially square shape when viewed from the thickness direction D thereof. The core material support portion 20 has a cylindrical shape and is provided so as to protrude in the thickness direction D of the flat plate portion 10 at substantially the center of the flat plate portion 10 . The leg portions 30 are provided at the four corners of the flat plate portion 10 so as to protrude in the same direction as the core support portion 20 . That is, the leg portion 30 is provided along the thickness direction D of the flat plate portion 10 . The leg portion 30 has a semicircular flat convex portion 31 projecting when viewed from the thickness direction D of the flat plate portion 10 . Thereby, the legs 30 ensure the self-supporting stability of the roll holding plate 1 of the present embodiment.

The side wall portions 40 form the peripheral surface of the flat plate portion 10 by extending in the direction opposite to the projecting direction of the core support portion 20 and the leg portions 30 on the four sides of the flat plate portion 10 . That is, the side wall portion 40 extends in the thickness direction D of the flat plate portion 10 . The side wall portion 40 includes a side convex portion 42 , a side concave portion 44 , a groove 46 and a side flat portion 48 . The side convex portion 42 is a portion of the side wall portion 40 that protrudes outward from the flat plate portion 10 . The side recessed portion 44 is a portion of the side wall portion 40 that is recessed inward of the flat plate portion 10 . The groove 46 is an elongated recess provided along the thickness direction D of the flat plate portion 10 in the side wall portion 40 . The side flat portion 48 is a flat portion provided along the thickness direction D of the flat plate portion 10 in the side wall portion 40 .

The recess 50 is recessed from the flat plate portion 10 in the thickness direction D of the flat plate portion 10 . The recessed portions 50 are provided at positions substantially in the center of each of the four sides of the flat plate portion 10 and at positions adjacent to the leg portions 30 at both ends of each side. In the concave portion 50 adjacent to the leg portion 30 , the side convex portion 42 located on the outer side of the flat plate portion 10 also serves as the groove 46 .

In the following description, the thickness direction D of the flat plate portion 10 may be abbreviated as "thickness direction D".

As shown in FIGS. 4-6, recess 50 includes recess side walls 52 , recess bottom wall 54 , and curved surface portion 56 . The side wall 52 of the recess is a wall parallel to the thickness direction D, and includes a wall 52A that also serves as a recess, a wall 52B facing the recess, and a pair of connecting walls 52C. The recessed wall 52A is part of the side wall 40 and also serves as the side projection 42 or the groove 46 of the side wall 40 . The recess facing wall 52B is provided so as to face the recessed wall 52A on the inner side of the roll holding disk 1 of the present embodiment. 52 C of a pair of recessed part connection walls are provided so that 52 A of recessed part common walls and the recessed part opposing wall 52B may be connected along the thickness direction D. As shown in FIG.

The recess bottom wall 54 is located on the side of the end surface 40A of the side wall portion 40 (recess side wall 52) located in the direction opposite to the projecting direction of the core support portion 20 and the leg portion 30. , the recess facing wall 52B, and the pair of recess connecting walls 52C). The curved surface portion 56 is a curved wall that protrudes outward from the recess 50 and is provided across the recessed wall 52</b>A of the recessed side wall 52 and the recessed bottom wall 54 . In this manner, the recess 50 is recessed to the end surface 40A of the side wall portion 40, but may be recessed to the vicinity of the end surface 40A of the side wall portion 40 as well.

The leg portion 30 is provided therein with a leg recess portion 32 that is recessed in the projecting direction of the leg portion 30 . A part of the wall forming the leg recess 32 (that is, the leg portion 30) constitutes one of the pair of recess connecting walls 52C.

The band hooking portion 70 is composed of a portion of the side wall portion 40 (that is, the recessed portion wall 52A of the recessed portion side wall 52 of the recessed portion 50), the recessed portion bottom wall 54, and the curved portion 56. As shown in FIG.

The outer surface 12 is the rear surface of the flat plate portion 10 described above. Grid ribs 14A, circular ribs 14B, connecting ribs 14C, oblique ribs 14D, and the like are vertically provided on the outer surface 12 so as to protrude in the direction opposite to the protruding direction of the core member supporting portion 20 and the leg portions 30. ing. The grid ribs 14A are provided in a state in which vertical ribs and horizontal ribs intersect each other. The circular rib 14</b>B is provided substantially in the center of the outer surface 12 , has a cylindrical shape, and is substantially connected to the core supporting portion 20 . The connecting rib 14C is a part of the grid rib 14A, and is provided between the circular rib 14B and the recess facing wall 52B of the recess 50 positioned substantially in the center of the side wall 40. As shown in FIG. The oblique rib 14D is provided between the circular rib 14B and the leg portion 30. As shown in FIG.

As shown in FIG. 7, the flat plate portion 10 includes a doughnut-shaped opposing region 16 . The opposing region 16 is a flat region in which flat surfaces are continuous, and when the object 100 is held by the roll holding disc 1 of the present embodiment, the end side flat surfaces 102 of the object 100 face each other. be. The facing region 16 is distanced from each band hooking portion 70 (and recessed portion 50).

Since the outer surface 12 is the rear surface of the flat plate portion 10 as described above, it is on the opposite side of the flat plate portion 10 to the end side flat surface 102 of the held object 100 .

For example, as shown in FIG. 8, the roll holding disc 1 of the present embodiment can hold two holding objects 100 in a stacked state. Alternatively, as shown in FIGS. 9 and 10, the roll holding disc 1 of this embodiment can hold one holding object 100. FIG. For this purpose, the roll holding disc 1 of the present embodiment is arranged so that the core material supporting portion 20 is positioned so that the thickness direction D of the flat plate portion 10 is aligned with the height direction of the cylinder of the core material 104 of the object 100 to be held. 100 and is moved toward the end side plane 102 of the object to be held 100 until the flat plate portion 10 abuts or comes close to the core material 104 of the object to be held 100 . As a result, the core material supporting portion 20 supports the core material 104 of the object 100 to be held, and the facing region 16 of the flat plate portion 10 faces the end side plane 102 of the object 100 to be held while being spaced apart.

In this manner, the object to be held 100 is sandwiched between the pair of roll holding discs 1 . Furthermore, between the pair of roll holding discs 1 , the band B is stretched over the opposing band hooking portions 70 at approximately the center of each side wall portion 40 . As a result, the band B is in pressure contact with a part of the side wall portion 40 (that is, the recessed portion side wall 52A of the recessed portion side wall 52 of the recessed portion 50), the recessed portion bottom wall 54, and the curved surface portion 56. Therefore, the object to be held 100 is tightened while being sandwiched between the pair of roll holding discs 1 . However, the band B may be stretched over the opposing band hanging portions 70 on the end side (on the leg portion 30 side) of each side wall portion 40 .

Note that the object to be held 100 may be sandwiched between the pair of roll holding discs 1 and packed with cardboard. In such a case, the object 100 to be held floats inside the corrugated cardboard by the pair of roll holding discs 1, so that it is protected from external impacts and is prevented from being damaged.

As shown in FIG. 8 above, when the roll holding disc 1 of the present embodiment holds two objects 100 stacked in a stacked state, the upper roll holding disc 1 and the lower roll holding disc 1, the band B is spanned. Further, the side projections 42 and the side recesses 44 of the side walls 40 fit between the upper roll holding discs 1 and the lower roll holding discs 1, thereby preventing rattling in the stacking state. This point is the same when the roll holding disc 1 of the present embodiment holds three or more holding objects 100 in a stacked state. The same applies to the case where the roll holding disc 1 of the present embodiment holds a plurality of holding objects 100 arranged in the left-right direction.

The roll holding discs 1 of the present embodiment can be stacked with the thickness direction D along the vertical direction, for example, as shown in FIGS. 11 and 12 . In the following description, as shown in FIGS. 11 and 12, the reference numerals for the upper roll holding discs are denoted by "X", and the reference numerals for the lower roll holding discs are denoted by "Y".

When the upper roll holding disc 1X is stacked on the lower roll holding disc 1Y, the plane of the leg portion 30Y of the lower roll holding disc 1Y is aligned with respect to the leg recess 32X of the leg portion 30X of the upper roll holding disc 1X. The protrusion 31 enters. At this time, in the leg portion 30X of the upper roll holding plate 1X, the wall surface of the leg recess 32X and the end surfaces of the two restricting ribs 34X protruding inward from the leg portion 30X in directions orthogonal to each other from the wall surface of the leg recess 32X are , the flat convex portion 31 of the leg portion 30Y of the lower roll holding plate 1Y. As a result, in a state in which the upper roll holding disc 1X and the lower roll holding disc 1Y are stacked, relative positioning of the upper roll holding disc 1X and the lower roll holding disc 1Y is performed, and play is achieved. Sticking is prevented. This point is the same even if the upper roll holding disc 1X and the lower roll holding disc 1Y shown in FIGS. 11 and 12 are stacked upside down.

As described in detail above, in the roll holding disc 1 of the present embodiment, when the roll-shaped object 100 is held, the end flat surface 102 of the object 100 is opposed to the flat plate portion 10 and the core is held. The band B is applied to the band applying portion 70 while the core material 104 of the holding object 100 is supported by the material supporting portion 20 . The curved surface portion 56 that constitutes the band hooking portion 70 , which is pressed against the strapped band B, is formed across the side wall 52 of the recess (the wall 52</b>A that also serves as the recess) and the bottom wall 54 of the recess. It is a relatively large curved surface that protrudes outward. As a result, the roll holding disk 1 of the present embodiment prevents the band hooking portion 70 from being damaged and the band B from being worn out.

In this regard, the portion where the band B is pressed may extend to the side wall 52 of the recess and the bottom wall 54 of the recess. However, even in such a case, as shown in FIGS. work to prevent the band B from wearing out.

In the roll holding plate 1 of the present embodiment, the recessed side wall 52 includes a recessed side wall 52A that is a part of the side wall 40, and the band B is hung from the outside of the side wall 40 to the band hooking portion 70. , band B is easy to hang.

In the roll holding plate 1 of the present embodiment, the recessed side wall 52 formed with the curved surface portion 56 that constitutes the band hooking portion 70 is a recessed portion facing wall 52B that faces the side wall portion 40 (the recessed portion serving as a wall 52A that is a part of the side wall portion 40). , and a pair of recess connecting walls 52C that connect the side walls 40 (recess walls 52A) and the recess facing walls 52B, forming a four-sided frame. As a result, in the roll holding plate 1 of the present embodiment, the banding portion 70 has increased strength, so that even if a force is applied when the band B is applied, the banding portion 70 is less likely to be deformed or damaged.

In the roll holding disk 1 of this embodiment, the lattice ribs 14A, the circular ribs 14B, and the connecting ribs 14C provided on the outer surface 12 of the flat plate portion 10 further increase the strength of the band hooking portion 70. 70 is less likely to be deformed or damaged.

In the roll holding disk 1 of the present embodiment, the recess connecting walls 52C at the four corners of the flat plate portion 10 are part of the leg portions 30 provided along the thickness direction D of the flat plate portion 10 . Therefore, even if a force acts on the band hooking portion 70 when the band B is hooked, the force is dispersed to the leg portion 30 via the recess connecting wall 52C. Accordingly, in the roll holding plate 1 of the present embodiment, deformation of the banding portion 70 and the like are suppressed.

In the roll holding disc 1 of the present embodiment, the opposing region 16 facing the end side flat surface 102 of the held object 100 in the flat plate portion 10 is composed of one flat region. is prevented from being damaged.

In the roll holding disc 1 of the present embodiment, since the opposing region 16 is separated from each band hooking portion 70 in terms of distance, the held object 100 is not damaged by the band B hooked on each band hooking portion 70. .

In the roll holding disk 1 of the present embodiment, the concave portion 50 provided in the flat plate portion 10 prevents thickening of the portion corresponding to the band hooking portion 70 . As a result, deformation of the roll holding disc 1 after resin molding is prevented, and the weight of the roll holding disc 1 is reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, as shown in FIG. 13 , a doughnut-shaped pedestal portion 110 may be provided between the opposing region 16 of the flat plate portion 10 and the core support portion 20 . The pedestal portion 110 is provided so as to protrude from the flat plate portion 10 in the projecting direction of the core material support portion 20 , and when it comes into contact with or comes close to the core material 104 of the object to be held 100 , the object to be held 100 is The core member 104 and the flat plate portion 10 are separated from each other. As a result, the ability to prevent contact between (the flat surface 102 of) the object to be held 100 and the flat plate portion 10 is enhanced.

Also, the roll holding disk 1 (that is, the flat plate portion 10) may be circular or polygonal. A plurality of through holes may be provided in the flat plate portion 10 . The band hooking portion 70 may be provided other than the side wall portion 40 . A rib, such as grid rib 14A, may be between sidewall portion 40 and recess sidewall 52 .

Also, the facing region 16 may be a series of flat surfaces (that is, flat regions), for example, by including a plurality of recesses.

Further, the core member supporting portion 20 may be a recessed portion that enters into the flat plate portion 10 or may be a hole provided in the flat plate portion 10 . The hole may or may not be through.

1 roll holding plate 10 flat plate portion 12 outer surface 14A grid rib 14B circular rib 14C connecting rib 16 facing area 20 core support portion 30 leg portion 40 side wall portion 40A end face 50 recess 52 recess sidewall 52A recess-combining wall 52B recess-opposing wall 52C recess Connecting wall 54 Bottom wall of recess 56 Curved surface 70 Banding part 100 Object to be held 102 End plane 104 Core material B Band D Thickness direction of flat plate

Claims (6)

a flat plate portion facing the end side plane of the roll-shaped object to be held;
a core member supporting portion provided substantially in the center of the flat plate portion for supporting the core member of the object to be held;
a side wall portion that forms a peripheral surface of the flat plate portion by extending in the thickness direction of the flat plate portion;
a concave portion recessed from the flat plate portion in the thickness direction of the flat plate portion;
A band hanging part on which a band can be hung is provided,
The recess is
a side wall of the recess substantially parallel to the thickness direction of the flat plate;
a recess bottom wall continuous with the recess sidewall on the side of the end surface of the recess sidewall;
A curved surface portion formed over the side wall of the recess and the bottom wall of the recess and projecting outward from the recess,
The side wall of the recess is
a concave facing wall facing the side wall;
a recess connecting wall that connects the recess side wall and the recess facing wall;
The roll holding disc, wherein the band hooking portion is composed of the side wall of the concave portion, the bottom wall of the concave portion, and the curved surface portion. a flat plate portion facing the end side plane of the roll-shaped object to be held;
a core member supporting portion provided substantially in the center of the flat plate portion for supporting the core member of the object to be held;
a side wall portion that forms a peripheral surface of the flat plate portion by extending in the thickness direction of the flat plate portion;
a concave portion recessed from the flat plate portion in the thickness direction of the flat plate portion;
A band hanging part on which a band can be hung is provided,
The recess is
a side wall of the recess substantially parallel to the thickness direction of the flat plate;
a concave facing wall facing the side wall;
a recess connecting wall that connects the recess side wall and the recess facing wall;
a recess bottom wall continuous with the recess sidewall on the side of the end surface of the recess sidewall;
a curved surface portion formed over the side wall of the recess and the bottom wall of the recess and projecting outward from the recess;
The roll holding plate, wherein the band hooking portion is composed of the side wall of the recess, the bottom wall of the recess, and the curved surface portion. The recess sidewall includes a recess wall that is part of the sidewall,
3. The roll holding plate according to claim 1 , wherein the recess is recessed in the thickness direction of the flat plate portion to the end face of the wall that also serves as the recess or to the vicinity of the end face. a flat plate portion facing the end side plane of the roll-shaped object to be held;
a core member supporting portion provided substantially in the center of the flat plate portion for supporting the core member of the object to be held;
a side wall portion that forms a peripheral surface of the flat plate portion by extending in the thickness direction of the flat plate portion;
a concave portion recessed from the flat plate portion in the thickness direction of the flat plate portion;
A band hanging part on which a band can be hung is provided,
The recess is
a side wall of the recess substantially parallel to the thickness direction of the flat plate;
a recess bottom wall continuous with the recess sidewall on the side of the end surface of the recess sidewall;
A curved surface portion projecting outward from the recess,
The side wall of the recess is
a concave wall that is part of the side wall;
a concave facing wall facing the side wall;
a recess connecting wall that connects the recess-function wall and the recess-facing wall;
The curved surface portion is formed over the recessed wall and the recessed bottom wall,
The roll holding plate, wherein the band hooking portion is composed of the side wall of the recess, the bottom wall of the recess, and the curved surface portion. The flat plate portion
a lattice rib erected in a lattice shape on the outer surface of the object to be held on the side opposite to the side facing the end-side flat surface;
a circular rib erected substantially in the center of the outer surface;
5. The method according to any one of claims 1 to 4 , further comprising a connecting rib that is a part of the grid rib and spans between the circular rib and the wall facing the recess. Described roll holding disc. legs provided along the thickness direction of the flat plate portion at the corners of the flat plate portion;
6. The roll holding plate according to any one of claims 1 to 5, wherein a part of said leg portion is said recess connecting wall.

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