JP6183853B2 - Roll holder - Google Patents

Description

  The present invention includes a protection plate that covers an end surface of a roll, and a support protrusion that protrudes from the protection plate and is inserted into the core material of the roll. The roll penetrates the core material through the protection plate and the support protrusion. The present invention relates to a roll holding plate in which a shaft insertion hole into which a lifting shaft for lifting is inserted is formed.

  2. Description of the Related Art Conventionally, as this type of roll holding disc, there has been known one in which an annular flange wall projecting inward of a shaft insertion hole is formed at the tip of a support projection (see, for example, Patent Document 1).

Japanese Patent No. 3667355 (paragraph [0025], FIG. 1 and FIG. 4)

  However, the conventional roll holding disk described above has a problem that when the lifting shaft is inserted, the lifting shaft interferes with the annular flange wall, making it difficult to insert the lifting shaft.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a roll holding plate capable of easily inserting a suspended shaft into a shaft insertion hole.

  In order to achieve the above object, a roll holding disk according to the invention of claim 1 includes a protective plate that covers an end surface of the roll, and a support protrusion that protrudes forward from the protective plate and is inserted into the core of the roll. In a roll holding disc in which a shaft insertion hole is formed in the protective plate and the support projection to insert a lifting shaft for lifting the roll through the core material, the shaft is inserted from the front end of the support projection. A tapered wall that is folded back to the inner rear side of the hole and has a reduced diameter, and protrudes from the inner peripheral surface of the shaft insertion hole and extends forward from the rear side of the taper wall. And a plurality of inner inclined ribs for guiding the lifting shaft inserted from the rear to the inside of the tapered wall.

  The invention according to claim 2 is the roll holding plate according to claim 1, wherein the apex portions of all the inner inclined ribs are formed on the portion sandwiched between the inner inclined ribs adjacent in the circumferential direction in the rear end portion of the tapered wall. It is characterized in that a relief portion that is recessed outward from the passing cylindrical surface is provided.

  The roll holding disc according to the invention of claim 3 includes a protection plate that covers the end face of the roll, and a support protrusion that protrudes forward from the protection plate and is inserted into the core of the roll, and the protection plate and the support protrusion. In addition, in the roll holding plate in which the shaft insertion hole into which the lifting shaft for lifting the roll through the core material is inserted is formed, the shaft insertion hole protrudes from the inner peripheral surface of the shaft insertion hole and extends in the front-rear direction. A plurality of guide ribs whose protrusions gradually increase from the front and rear sides of the front end position toward the front end position of the shaft, and a plurality of guide ribs that protrude from the inner peripheral surface of the shaft insertion hole at the front end position of the support protrusion. And an annular rib having a size such that the protruding amount does not exceed the guide rib.

  According to a fourth aspect of the present invention, in the roll holding disk according to any one of the first to third aspects, a plurality of outer ribs are provided at the same circumferential position as the inner inclined rib or the guide rib in the outer peripheral surface of the support protrusion. It is characterized by the formation.

[Invention of Claim 1]
In the invention of claim 1, the front end portion of the support protrusion is reinforced by the tapered wall. Moreover, when the lifting shaft is inserted from the front into the shaft insertion hole, the lifting shaft can be inserted with the taper wall as a guide. Further, when the lifting shaft is inserted into the shaft insertion hole from behind, the lifting shaft can be inserted with the inner inclined rib as a guide. Here, the inner inclined rib guides the suspended shaft inserted from the rear of the shaft insertion hole to the inside of the tapered wall, so that the suspended shaft guided by the inner inclined rib is prevented from interfering with the tapered wall. It is. As described above, according to the present invention, it is possible to reinforce the front end portion of the support protrusion by the tapered wall and to easily insert the lifting shaft using the inner inclined rib as a guide. In addition, in the present invention, the tapered wall can be used also for guiding the lifting shaft.

[Invention of claim 2]
According to the invention of claim 2, when the lifting shaft is inserted into the shaft insertion hole from behind, even if the lifting shaft is partially sandwiched between the inner inclined ribs adjacent in the circumferential direction, It is possible to suppress the interference between the lifting shaft and the taper wall by disposing the relief portion of the taper wall outside the outer peripheral surface of the lifting shaft.

[Invention of claim 3]
In the invention of claim 3, the front end of the support protrusion is reinforced by the annular rib protruding from the inner peripheral surface of the shaft insertion hole at a position near the front end of the support protrusion. Further, in the present invention, even if the lifting shaft is inserted from either the front side or the rear side of the shaft insertion hole, the lifting shaft can be guided to the inside of the annular rib by the guide rib. As described above, according to the present invention, it is possible to reinforce the support protrusion by the annular rib and to easily insert the lifting shaft.

[Invention of claim 4]
According to the invention of claim 4, the inner inclined rib or the guide rib is reinforced by the outer rib. Further, when the roll holding disc is a resin molded product, it is possible to suppress the appearance defect due to the resin sink that occurs in the portion of the support protrusion where the inner inclined rib or the guide rib is provided.

The perspective view of the roll holding | maintenance board which concerns on 1st Embodiment of this invention. A perspective view of the roll holding plate as seen from the rear side Partially broken perspective view of roll holder Partially broken perspective view of roll holder Side cross-sectional view of stacked roll retainers Perspective view of roll holding plate in use Partially broken perspective view of the roll holding disc when the lifting shaft is inserted from the rear side Side sectional view of the roll holding disc when the lifting shaft is inserted from the front side (A) Side sectional view of the roll holding plate when the lifting shaft is inserted from the front side, (B) Side sectional view of the roll holding plate when the lifting shaft is inserted from the rear side View of taper wall from back Enlarged view around the relief part in FIG. The perspective view of the roll holding disk which concerns on 2nd Embodiment of this invention. Side cross-sectional view of stacked roll retainers The partially broken perspective view of the roll holding disk which concerns on 3rd Embodiment of this invention. Partially broken perspective view of roll holder (A) Side sectional view of the roll holding plate when the lifting shaft is inserted from the rear side, (B) Side sectional view of the roll holding plate when the lifting shaft is inserted from the front side (A) Side sectional view of a roll holding plate according to a modification, (B) Side sectional view of a roll holding plate according to a modification. The figure which looked at the taper wall concerning a modification from the back side (A) Side sectional view of a roll holding plate according to a modification, (B) Side sectional view of a roll holding plate according to a modification.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the roll holding disk 10 according to the present embodiment is a resin molded product and has a structure in which a support cylinder portion 30 protrudes forward from the center portion of the protection plate 11. As shown in FIG. 2, the protection plate 11 includes a main plate 12 having a substantially quadrangular planar shape and an enclosing wall 13 projecting rearward from the outer edge portion of the main plate 12, and a space surrounded on all sides by the enclosing wall 13 It is partitioned by a plurality of ribs.

  Specifically, as shown in FIG. 2, a cylindrical wall 16 erected from the opening edge of the central circular hole 12 </ b> A penetrating the main plate 12 is provided in the center of the space surrounded by the surrounding wall 13. A central connecting rib 14 </ b> A protrudes from the center of each side portion of the surrounding wall 13 toward the center of the main plate 12 and communicates with the outer peripheral portion of the cylindrical wall 16. A pair of side connecting ribs 14 </ b> B and 14 </ b> B arranged so as to sandwich the cylindrical wall 16 is interposed between the opposing sides of the surrounding wall 13. That is, the cylindrical wall 16 is surrounded by four side connecting ribs 14B arranged in a well shape. Further, the bridging rib 17 extends in a diagonal direction of the main plate 12 and communicates with the cylindrical wall 16 from the intersection of the side connecting walls 14B and 14B.

  The outer periphery of the space surrounded on all sides by the surrounding wall 13 is partitioned into a plurality of rooms 13A having a square shape in plan view by the central connecting wall 14A and the side connecting wall 14B. Each room 13A includes a room 13A. Reinforcing ribs 15, 15 are provided to connect the opposite corners of each other. A window portion 13B is formed in a portion of the main plate 12 corresponding to each room 13A.

  As shown in FIG. 4, an annular stepped portion 18 projecting forward (that is, opposite to the cylindrical wall 16) on the opening edge of the central circular hole 12 </ b> A of the main plate 12 and projecting inside the central circular hole 12 </ b> A. Is provided. Then, from the annular step portion 18, the above-described support cylinder portion 30 protrudes on the opposite side to the cylindrical wall 16. The cylindrical wall 16, the central circular hole 12 </ b> A, and the support cylinder portion 30 constitute a shaft insertion hole 20 according to the present invention. In the present embodiment, the support cylinder 30 corresponds to the “support protrusion” of the present invention.

  As shown in FIG. 2, a plurality of reinforcing ribs 16 </ b> L are provided inside the cylindrical wall 16 and the annular stepped portion 18. Specifically, as shown in FIG. 4, the plurality of reinforcing ribs 16L extend from the rear end portion of the cylindrical wall 16 in the axial direction of the cylindrical wall 16 and come into contact with the annular stepped portion 18, and the rear end of each reinforcing rib 16L. The portion is formed with a tapered portion 16K that is inclined so that the protruding amount becomes smaller toward the rear side. The plurality of reinforcing ribs 16 </ b> L are arranged at equal intervals in the circumferential direction of the cylindrical wall 16.

  Next, the support cylinder part 30 is demonstrated. As shown in FIG. 1, a tapered wall 35 is provided on the inner side of the front end portion of the support cylinder portion 30. As shown in FIG. 3, the tapered wall 35 is formed so as to be folded back inward from the front end of the support cylinder portion 30, and has a shape whose diameter is reduced toward the rear side (protection plate 11 side). .

  As shown in FIG. 4, a plurality of inner inclined ribs 32 extending in the front-rear direction protrude from the inner peripheral surface 30 </ b> M of the support cylinder portion 30. The inner inclined rib 32 is formed over the entire front-rear direction of the support cylinder portion 30 and has a vertex portion 32A having the largest protrusion amount at a position near the front end. Further, the rear side of the apex portion 32A of the inner inclined rib 32 is a rear inclined portion 32B in which the amount of protrusion increases toward the front, and the amount of protrusion on the front side of the apex portion 32A increases toward the rear. It is a front inclined portion 32C. The inner inclined rib 32 communicates with the end portion on the narrowed side of the tapered wall 35 at the apex portion 32A.

  As shown in FIG. 3, a plurality of outer ribs 31 extending in the front-rear direction are provided on the outer peripheral portion of the support cylinder portion 30. The outer rib 31 is disposed from the front end portion to the rear end portion of the support cylinder portion 30 and communicates with the annular step portion 18.

  As shown in FIG. 4, the plurality of outer ribs 31 are arranged at the same circumferential position as the plurality of inner inclined ribs 32. Thereby, the outer side rib 31 and the inner side inclination rib 32 continue in the radial direction of the support cylinder part 30, and the reinforcement of the inner side inclination rib 32 is achieved. Further, as described above, since the roll holding disc 10 is a resin molded product, the outer rib 31 makes the appearance defect due to the resin sink generated in the portion of the support cylinder portion 30 provided with the inner inclined rib 32 conspicuous. Can be eliminated.

  Further, the protruding amount of the outer rib 31 from the support cylinder portion 30 is a height that does not protrude outward from the annular step portion 18. Therefore, when viewed from the front-rear direction, the outer ribs 31 are disposed so as to fit inside the cylindrical wall 16. Thereby, the roll holding | maintenance disc | board 10 of this embodiment can be piled up so that protection plates 11 may be piled up. Specifically, as shown in FIG. 5, the support cylinder portion 30 of the protection plate 10 arranged on the lower side is inserted into the cylindrical wall 16 of the protection plate 10 arranged on the upper side, and the protection plates 10 are connected to each other. Are stacked. At this time, there is a possibility that the outer rib 31 of the support cylinder part 30 and the reinforcing rib 16L of the cylindrical wall 16 interfere with each other. However, in the present embodiment, the outer rib 31 is at a position shifted in the circumferential direction with respect to the reinforcing rib 16L. By being arranged, interference between the reinforcing rib 16L and the outer rib 31 is avoided.

  FIG. 6 shows the roll holding plate 10 in use. When the roll holder 10 is used, as shown in FIGS. 7 and 8, the support cylinder portion 30 is inserted into the core material 91 of the roll 90 at both ends of the roll 90, and the end surface of the roll 90 is attached to the protective plate 11. Cover. Then, when the protection plate 11 is raised, the end portion of the core material 91 is supported from the inside by the support cylinder portion 30, and the roll 90 is lifted by the two roll holding discs 10, as shown in FIG. Supported by the state. In addition, although the support cylinder part 30 receives a load from the roll 90, in this embodiment, reinforcement of the front-end | tip part of the support cylinder part 30 is achieved by the taper wall 35. FIG.

  Here, as shown in FIGS. 7 and 8, when the roll holding plate 10 is attached to the roll 90, the core material 91 and the annular stepped portion 18 come into contact with each other. 7 and 8, the roll 90 has a configuration in which the axial length of the core 91 is longer than the axial length of the roll main body 92, and the core 91 protrudes from both ends of the roll main body 92. However, when the axial length of the core 91 and the axial length of the roll main body 92 coincide with each other, the end face of the roll 90 comes into contact with the main plate 12 of the protective plate 11 by the annular stepped portion 18 coming into contact with the core 91. Is prevented.

  By the way, when moving the roll 90 supported by the roll holding disk 10, the lifting shaft 80 may be used as follows. That is, the lifting shaft 80 is inserted from the shaft insertion hole 20 of one roll holding plate 10, and the lifting shaft 80 is inserted into the inside of the roll 90 (core material 91) and the shaft insertion hole 20 of the other roll holding plate 10. , And the roll 90 is moved by lifting both ends of the lifting shaft 80.

  FIG. 7 shows a state where the lifting shaft 80 is inserted into the shaft insertion hole 20 from the rear. Here, as described above, since the tapered portions 16K are formed at the rear end portions of the plurality of reinforcing ribs 16L provided in the cylindrical wall 16, the lifting shaft 80 is inserted into the shaft insertion hole 20. Sometimes, even if the lifting shaft 16 abuts against the opening edge of the cylindrical wall 16, the lifting shaft 80 is guided to the back side of the shaft insertion hole 20 by the tapered portion 16K.

  When the lifting shaft 80 penetrates the protective plate 11 and enters the support cylinder 30, the lifting shaft 80 is inserted into the shaft insertion hole by the rear inclined portion 32 </ b> B of the inner inclined rib 32 as shown in FIG. 9A. 20 is guided to the central axis side. That is, in the present embodiment, the lifting shaft 80 can be inserted using the rear inclined portion 32B of the inner inclined rib 32 as a guide. Here, since the inner inclined rib 32 communicates with the end of the tapered wall 35 at the apex portion 32 </ b> A, the lifting shaft 80 guided by the inner inclined rib 32 interferes with the tapered wall 35. Without passing through the inside of the tapered wall 35. Thus, in the present embodiment, the inner inclined rib 32 guides the lifting shaft 80 inserted from the rear into the shaft insertion hole 20 to the inside of the tapered wall 35 by the rear end inclined portion 32B. .

  Here, if the lifting shaft 80 is inserted in a state where it is partially sandwiched between the inner inclined ribs 32 adjacent to each other in the circumferential direction, a problem that the lifting shaft 80 interferes with the tapered wall 35 may occur. . In order to solve this problem, in the roll holding disk 10 of this embodiment, the taper wall 35 is devised as described below.

  That is, as shown in FIG. 10, in the rear end portion of the tapered wall 35, the portion sandwiched between the apex portions 32 </ b> A of the inner inclined ribs 32 adjacent in the circumferential direction has all the inner inclined ribs 32. An escape portion 36 that is recessed outward from the cylindrical surface L1 that connects the apex portions 32A is provided. In the present embodiment, the relief portion 36 is an arc surface that constitutes a part of the cylindrical surface L2 having a smaller diameter than the cylindrical surface L1. Therefore, when the diameter of the lifting shaft 80 is larger than the diameter of the cylindrical surface L2, the lifting shaft 80 is partially sandwiched between the inner inclined ribs 32, 32 adjacent in the circumferential direction as shown in FIG. Even if inserted in the state where it is inserted, it is possible to prevent the lifting shaft 80 from interfering with the tapered wall 35. In other words, interference between the lifting shaft 80 and the taper wall 35 can be prevented by making the cylindrical surface L2 constituting the escape portion 36 smaller in diameter than the lifting shaft 80.

  As described above, in the present embodiment, by providing the relief portion 36 in the tapered wall 35, the lifting shaft 80 is inserted in a state of being partially sandwiched between the inner inclined ribs 32, 32 adjacent in the circumferential direction. However, the interference between the lifting shaft 80 and the tapered wall 35 can be suppressed.

  FIG. 8 shows a state where the lifting shaft 80 is inserted into the shaft insertion hole 20 from the front. When the lifting shaft 80 is inserted from the front, the lifting shaft 80 is guided to the rear side of the shaft insertion hole 20 by the tapered wall 35 as shown in FIG. 9B.

  Here, when the hoisting shaft 80 is inserted into the shaft insertion hole 20 from the front, the hoisting shaft 80 passes through the core member 91, so that the tip portion of the hoisting shaft 80 is directed to the operator. In addition, since the tip of the lifting shaft 80 is far away from the operator who inserts the lifting shaft 80, it becomes difficult to operate the lifting shaft 80, and the lifting shaft 80 has a front end of the support cylinder portion 30. It is easy to collide with the part. However, in this embodiment, as described above, since the front end portion of the support tube portion 30 is reinforced by the tapered wall 35, the support tube portion 30 can be prevented from being damaged.

  This completes the description of the configuration of the roll holder 10. In the roll holding disc 10 of the present embodiment, the front end portion of the support cylinder portion 30 can be reinforced by the tapered wall 35. Moreover, when the lifting shaft 80 is inserted into the shaft insertion hole 20 from the front, the lifting shaft 80 can be inserted with the taper wall 35 as a guide. Further, when the lifting shaft 80 is inserted from behind the shaft insertion hole 20, the lifting shaft 80 can be inserted with the rear inclined portion 32 </ b> B of the inner inclined rib 32 as a guide. Here, since the inner inclined rib 32 guides the lifting shaft 80 inserted from the rear of the shaft insertion hole 20 to the inside of the tapered wall 35, the lifting shaft 80 inserted from the rear interferes with the tapered wall 35. It is prevented. Thus, according to the present embodiment, the lifting shaft 80 can be easily inserted with the tapered wall 35 and the inner inclined rib 32 as a guide. In addition, the tapered wall 35 can be used for both the reinforcement of the support cylinder portion 30 and the guide of the lifting shaft 80.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. The present embodiment is a modification of the first embodiment, and mainly the structure of the protection plate is different. Specifically, as shown in FIGS. 12 and 13, the protective plate 11 </ b> V of the roll holder 10 </ b> V of the present embodiment is replaced with the annular step portion 18 (see FIG. 4) described in the first embodiment. A flange portion 19 is provided. The flange portion 19 is common to the annular stepped portion 18 in that it protrudes inward from the opening edge of the central circular hole 12A of the main plate 12, but is different from the main plate 12 in that it is flush with the main plate 12. In the present embodiment, the support cylinder portion 30 protrudes from the flange portion 19.

  In the present embodiment, the protruding amount of the outer rib 31 of the support cylinder portion 30 is a height that does not protrude outside the flange portion 19. Therefore, the roll holding disc 10V of this embodiment can be stacked in the same manner as in the first embodiment (see FIG. 13).

  Since the other configuration of the roll holding plate 10V is the same as that of the first embodiment, the description thereof is omitted by giving the same reference numerals. According to the roll holder 10V of the present embodiment, the same effects as those of the first embodiment can be obtained.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 14, the roll holding disk 10 </ b> W of the present embodiment includes guide ribs 42 having the same structure as the inner inclined rib 32 of the first embodiment inside the support cylinder portion 30 </ b> W. Specifically, as shown in FIG. 15, the guide rib 42 has a vertex portion 42A at a position near the front end of the support cylinder portion 30W, and protrudes toward the vertex portion 42A on the rear side and the front side from the vertex portion 42A. A rear inclined portion 42B and a front inclined portion 42C having an increased amount are provided.

  Further, an annular rib 45 that protrudes from the inner peripheral surface 30M and crosses the plurality of guide ribs 42 is provided at a position near the front end of the support cylinder part 30W, thereby reinforcing the front end part of the support cylinder part 30W. . Specifically, the annular rib 45 is disposed at the same position as the apex portion 42A of the guide rib 42 in the axial direction of the support cylinder portion 30W, and the protruding amount of the annular rib 45 is the same height as the apex portion 42A of the guide rib 42. ing. That is, the protruding amount of the annular rib 45 is a height that does not exceed the plurality of guide ribs 42.

  A portion of the annular rib 45 sandwiched between the apex portions 42A of the guide ribs 42 adjacent to each other in the circumferential direction is provided with a relief portion 46 similar to the relief portion 36 of the tapered wall 35 of the first embodiment. Yes. Specifically, the relief portion 46 is an arc surface that is recessed outward from the cylindrical surface that communicates the apex portions 42 </ b> A of all the guide ribs 42.

  Since the other configuration of the roll holding plate 10W is the same as that of the first embodiment, description thereof is omitted by attaching the same reference numerals. That is, the roll holding disk 10W of the present embodiment has a structure in which the annular rib 45 is provided instead of the tapered wall 35 in the roll holding disk 10 of the first embodiment.

  FIGS. 16A and 16B show how the lifting shaft 80 is inserted into the shaft insertion hole 20 of the roll holding disc 10W. When the lifting shaft 80 is inserted from behind the shaft insertion hole 20, as shown in FIG. 16A, the lifting shaft 80 is inserted into the shaft insertion hole 20 using the rear inclined portion 42 B of the guide rib 42 as a guide. Can be inserted. Further, when the lifting shaft 80 is inserted from the front of the shaft insertion hole 20, as shown in FIG. 16B, the front inclined portion 42C of the guide rib 42 is used as a guide, and the lifting shaft 80 shaft insertion hole 20 is inserted. Can be inserted.

  Here, in the present embodiment, the annular rib 45 protrudes so as not to exceed the plurality of guide ribs 42, so that the lifting shaft 80 guided by the guide rib 42 is prevented from interfering with the annular rib 45. Thus, according to the present embodiment, it is possible to reinforce the support cylinder portion 30 with the annular rib 45 and to easily insert the lifting shaft.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) As shown in FIG. 17A, in the first embodiment, the inner inclined rib 32 is extended to the inside of the cylindrical wall 16 without providing the reinforcing rib 16L inside the cylindrical wall 16. Also good. Further, this configuration may be applied to the second and third embodiments. In addition, according to the structure of the said 1st-3rd embodiment, the roll holding | maintenance discs 10-10W can be stacked.

  (2) As shown in FIG. 17B, the inner inclined rib 32 may be trapezoidal. In this case, the apex portion 32 is configured to extend from the rear end portion of the tapered wall 35 to the rear side of the support cylinder portion 30.

  (3) In the first and second embodiments, the relief portion 36 provided on the tapered wall 35 is configured by an arc surface that constitutes a part of the cylindrical surface. For example, as shown in FIG. , May be composed of a plurality of planes. Moreover, you may apply this structure to the escape part 46 of 3rd Embodiment.

  (4) In the third embodiment, the guide rib 42 may have a trapezoidal shape as shown in FIG. 19A or a shape as shown in FIG. 19B.

  (5) In the configuration of the third embodiment and the above (4), the protruding amount of the annular rib 45 is the same as the height of the vertex portion 42A of the guide rib 42, but may be lower than the vertex portion 42A.

10, 10V, 10W Roll retainer 11, 11V Protection plate 16 Cylindrical wall 20 Shaft insertion hole 30, 30W Support cylinder part 31 Outer rib 32 Inner inclined rib 35 Taper wall 36 Escape part 42 Guide rib 45 Annular rib

Claims (4)

A protective plate that covers an end surface of the roll; and a support protrusion that protrudes forward from the protection plate and is inserted into the core material of the roll, and penetrates the core material through the protection plate and the support protrusion. In the roll holding plate in which the shaft insertion hole into which the lifting shaft for lifting the roll is inserted is formed,
A taper wall that is folded from the front end portion of the support protrusion to the inner rear side of the shaft insertion hole and reduced in diameter;
The tapered shaft protrudes from the inner peripheral surface of the shaft insertion hole and extends forward from the rear side of the taper wall, and the amount of protrusion increases as the taper wall is approached. A roll holding disc comprising: a plurality of inner inclined ribs for guiding the inside of the wall.   Of the rear end portion of the tapered wall, a portion sandwiched between the inner inclined ribs adjacent in the circumferential direction is provided with a relief portion recessed outward from the cylindrical surface passing through the apex portions of all the inner inclined ribs. The roll holding disk according to claim 1. A protective plate that covers an end surface of the roll; and a support protrusion that protrudes forward from the protection plate and is inserted into the core material of the roll, and penetrates the core material through the protection plate and the support protrusion. In the roll holding plate in which the shaft insertion hole into which the lifting shaft for lifting the roll is inserted is formed,
A plurality of guide ribs that protrude from the inner peripheral surface of the shaft insertion hole and extend in the front-rear direction, toward the position near the front end of the shaft insertion hole, and the amount of protrusion gradually increases from both front and rear sides near the front end position;
An annular rib projecting from the inner peripheral surface of the shaft insertion hole at a position near the front end of the support projecting portion, traversing the plurality of guide ribs, and having a projecting amount not exceeding the guide ribs. Roll holding board.   The roll holding according to any one of claims 1 to 3, wherein a plurality of outer ribs are formed at the same peripheral position as the inner inclined rib or the guide rib in the outer peripheral surface of the support protrusion. Board.

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