Uncoiler and mandrel

Abstract

To provide an uncoiler and a segment capable of stabilizing pressing force of a coil body by a coil pressing roller while suppressing manufacturing cost.SOLUTION: An uncoiler incudes: a mandrel that is configured be inserted into a central hole of a coil body having the central hole and to be capable of holding the coil body at its peripheral surface; and a coil pressing roller that is configured to be capable of contacting an outer periphery of the coil body attached to the mandrel, wherein the mandrel has a plurality of segments forming an outer peripheral surface, each of the plurality of segments is configured to be movable in a radial direction, each segment has a plurality of convex portions and concave portions alternately formed on a side along an axial direction, the convex portions and the concave portions are configured to mesh with the concave portions and the convex portions formed on adjacent segments, and in each segment, a concave portion or a convex portion formed at a position corresponding to the coil pressing roller is a narrow concave portion or a narrow convex portion having a width shorter than a width of the coil pressing roller.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an uncoiler and a mandrel. [Background technology]

[0002] Conventionally, when a coil body formed by winding a metal sheet into a coil shape is sent to a press device via a leveller, an uncoiler has been used as a device for unwinding the coil body (Patent Document 1).

[0003] For example, Patent Document 1 discloses an uncoiler that includes a holding section on which a coil body is mounted and that is configured to be rotatably driven, and a coil pressing arm that presses the coil body from above. The holding section of the uncoiler in Patent Document 1 is provided with a plurality of segments that are each movable in the radial direction of the rotation axis of the holding section, and the coil body is held by each segment moving in the radial direction within the hollow section of the coil body mounted on the holding section.

[0004] Moreover, the segment described in Patent Document 1 has a plurality of protrusions extending toward the sides of the adjacent segments, arranged at intervals in a comb-tooth shape, and the protrusions are inclined downward from the adjacent segment (i.e., toward the radial inside of the holding part). In the segment described in Patent Document 1, the protrusions are inclined downward in this manner, which prevents the end of the plate material from getting caught between the segments and being wound up when the number of turns of the coil body decreases and the coil body starts to rotate idly. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4297534 Summary of the Invention [Problem to be solved by the invention]

[0006] 10(a) and 10(b), however, when the segments S are formed into a comb shape in an uncoiler equipped with a coil pressing roller R, the pressing force on the coil body C is reduced in the gaps generated between adjacent segments S, which may cause the coil body C to fall off the segment S and the coil pressing roller R to fall into these gaps, possibly scratching or bending the coil body C. On the other hand, narrowing the widths of the convex and concave portions in order to narrow the gaps between the segments increases the difficulty of the cutting process and the processing time, resulting in problems of increased manufacturing costs.

[0007] One aspect of the present invention is an uncoiler and a segment that are capable of stabilizing the pressing force of the coil body by the coil pressing roller while suppressing manufacturing costs. [Means for solving the problem]

[0008] An uncoiler according to one embodiment of the present invention comprises a mandrel configured to be inserted into a central hole of a coil body having a central hole and capable of holding the coil body at its circumferential surface, and a coil pressure roller configured to abut against the outer periphery of the coil body attached to the mandrel, the mandrel having a plurality of segments forming an outer circumferential surface, each of the plurality of segments being configured to be movable in the radial direction, each segment having a plurality of alternating convex portions and concave portions formed along the axial direction on its side, the convex portions and the concave portions being configured to mutually mesh with the concave portions and the convex portions formed in the adjacent segments, and in each segment, the concave portions or the convex portions formed at a position corresponding to the coil pressure roller are narrow concave portions or narrow convex portions having a width shorter than the width of the coil pressure roller.

[0009] A mandrel according to one embodiment of the present invention is a mandrel that can be attached to an uncoiler having a coil pressure roller configured to abut against the outer periphery of a coil body, and has a plurality of segments that are inserted into the central hole of the coil body and form an outer periphery capable of holding the coil body, and each of the segments is configured to be movable in the radial direction, and each segment has a plurality of alternating convex portions and concave portions formed along the axial direction on its side, and the convex portions and the concave portions are configured to mutually mesh with the concave portions and the convex portions formed in the adjacent segments, and in each segment, the concave portions or the convex portions formed at a position corresponding to the coil pressure roller are narrow concave portions or narrow convex portions having a width shorter than the width of the coil pressure roller. Effect of the Invention

[0010] In accordance with one aspect of the present invention, an uncoiler and mandrel are provided at a position corresponding to the coil pressure roller, and narrow recesses or narrow protrusions having a width shorter than the width of the coil pressure roller are provided. This makes it possible to prevent the coil pressure roller from sinking into the gaps between the segments, and also simplifies processing compared to when all of the protrusions and recesses are narrow recesses and narrow protrusions. This makes it possible to stabilize the pressing force of the coil body by the coil pressure roller while keeping manufacturing costs down. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic perspective view showing the configuration of an uncoiler according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic perspective view showing the configuration of the segments when contracted. [Diagram 3] FIG. 3 is a schematic perspective view showing the configuration of the segment when expanded. [Figure 4] FIG. 4 is an enlarged schematic view showing the vicinity of a position corresponding to a coil pressing roller of the segment shown in FIG. [Diagram 5] FIG. 5 is a schematic diagram showing the width of each component of the segments shown in FIG. 3 and the width of the coil pressing roller. [Figure 6] FIG. 6(a) is a schematic cross-sectional view of the mandrel when contracted, FIG. 6(b) is a schematic cross-sectional view of the mandrel when slightly expanded, and FIG. 6(c) is a schematic cross-sectional view of the mandrel when expanded. [Figure 7] FIG. 7 is a schematic diagram showing a state in which the uncoiler according to this embodiment is used. [Figure 8] FIG. 8 is a schematic diagram showing a plate material supplying device including a mandrel according to this embodiment. [Figure 9] FIG. 9 is a schematic diagram showing another plate material supplying device including a mandrel according to the present embodiment. [Figure 10] FIG. 10(a) is a schematic diagram showing the shape of a conventional segment, and FIG. 10(b) is a schematic diagram showing the conventional segment in use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. In addition, in the present embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0013] [Overall structure of the uncoiler] FIG. 1 is a schematic perspective view showing the configuration of an uncoiler according to one embodiment of the present invention. The overall configuration of an uncoiler 1 according to this embodiment will be outlined with reference to Fig. 1. As shown in Fig. 1, the uncoiler 1 according to this embodiment includes a mandrel 10 configured to be inserted into a central hole of a coil body C having a central hole and capable of holding the coil body C at its peripheral surface, and a coil pressing roller 30 configured to be able to abut against the outer periphery of the coil body C attached to the mandrel 10. The uncoiler 1 may further include a side guide 40 capable of supporting an end portion of the coil body C in the width direction.

[0014] In this specification, the "up-down direction" refers to the vertical direction (up-down direction in Figure 1) when the uncoiler 1 is installed, the "width direction" refers to the axial direction of the mandrel 10 attached to the uncoiler 1 (depth direction in Figure 1), the "forward direction" refers to the direction in which the sheet material is unwound from the coil body C (leftward in Figure 1) among directions (left-right directions in Figure 1) perpendicular to both the up-down direction and the width direction, and the "rearward direction" refers to the opposite direction (rightward in Figure 1).

[0015] 1, the coil body C is formed by winding a metal plate into a coil shape, and a central hole into which a mandrel 10 can be inserted is formed in the axial center thereof across the entire width direction. The coil body C targeted by the uncoiler 1 according to this embodiment is not particularly limited as long as it has a configuration that allows it to be attached to the mandrel 10, and various known coil bodies can be used.

[0016] Fig. 2 is a schematic perspective view showing the configuration of the segments when contracted, and Fig. 3 is a schematic perspective view showing the configuration of the segments when enlarged. The mandrel 10 is formed in a generally cylindrical shape having an axial length sufficient for insertion into the central hole of the coil body C, and is configured to be able to support the coil body C. Specifically, as shown in Figures 2 and 3, the mandrel 10 includes a cylindrical main shaft portion 12 and a plurality of (four in this embodiment) segments 20 that are attached to the main shaft portion 12 via link members (not shown) and form the outer circumferential surface of the mandrel 10.

[0017] The main shaft portion 12 has a connection portion 16 that can be connected to a drive portion (not shown) provided on the uncoiler 1, and is configured to be axially rotatable at a predetermined payout speed by the driving force of this drive portion (not shown). The connection portion 16 is configured to be detachable from the drive portion of the uncoiler 1, and is configured to be able to replace the mandrel 10 with a new one when the mandrel 10 is damaged or the like. The mandrel 10 according to this embodiment can be shared with any device having a connection structure that is compatible with the connection portion 16, and can be used, for example, in a leveller feeder type plate material supplying device LL described later, or in a tandem type plate material supplying device TL described later. Note that the main shaft portion 12 and the drive portion can adopt various known configurations, and detailed explanations thereof will be omitted.

[0018] FIG. 6(a) is a schematic cross-sectional view of the mandrel when contracted, FIG. 6(b) is a schematic cross-sectional view of the mandrel when slightly expanded, and FIG. 6(c) is a schematic cross-sectional view of the mandrel when expanded. As shown in FIG. 6, each of the segments 20 has a substantially arc-shaped outer peripheral surface, and is arranged in a line along the circumferential direction of the main shaft portion 12 (not shown in FIG. 5). The plurality of segments 20 cooperate with each other to form a substantially cylindrical outer peripheral surface of the mandrel 10, and are configured to rotate together with the main shaft portion 12 when the main shaft portion 12 is rotated about its axis by the drive unit. In addition, each of the plurality of segments 20 is configured to be movable in the radial direction. Specifically, the plurality of segments 20 are connected to the main shaft portion 12 via a link member (not shown) configured to be expandable in the radial direction of the main shaft portion 12, and are configured to be movable in the radial direction of the main shaft portion 12 by the expansion and contraction action of the link member. The movement of the segments 20 is not limited to that performed by the expansion and contraction action of the link member, and may be any of various methods such as the sliding action of an inclined block, or may be performed by a combination of two or more mechanisms.

[0019] With this configuration, the mandrel 10 is configured so that, as shown in FIG. 6(a), the link members are contracted to move the multiple segments 20 radially inwardly backward, thereby narrowing the diameter and making it possible to insert the mandrel 10 into the center hole of the coil body C. Also, as shown in FIG. 6(b) and FIG. 6(c), the mandrel 10 is configured so that, as shown in FIG. 6(b) and FIG. 6(c), the link members are expanded to move the multiple segments 20 radially outwardly forward, thereby widening the diameter and making it possible to hold the coil body C in close contact with the inner surface of the center hole of the coil body C. The mandrel 10 may be configured so that the outer diameter can be changed in multiple steps according to the size and type of the center hole of the coil body C, or so that the outer diameter can be changed continuously (steplessly) until it fits the inner diameter of the center hole of the coil body C. As shown in FIG. 6(b) and FIG. 6(c), each segment 20 has a curvature and end shape such that no corners are generated on the outer circumferential surface even when the mandrel 10 is in an expanded state.

[0020] When the number of turns of the coil body C decreases as the sheet material is unwound, the elasticity of the coil body C itself causes the coil body C to bulge radially outward, gradually expanding the diameter of the central hole of the coil body C. The mandrel 10 according to this embodiment is configured to move the multiple segments 20 forward radially outward to follow the expansion of the diameter of the central hole of the coil body C in this manner, thereby maintaining a state in which the outer circumferential surface of the mandrel 10 abuts against the inner surface of the central hole of the coil body C.

[0021] 2 and 3, each segment 20 has a plurality of alternating protrusions 22 and recesses 24 formed along the axial direction on both sides thereof, and the protrusions 22 and recesses 24 are configured to interlock with recesses 24 and protrusions 22 formed in adjacent segments 20. Each segment 20 is configured such that the arrangement order of the protrusions 22 and recesses 24 on one side is reversed to the arrangement order of the protrusions 22 and recesses 24 on the other side, which allows each segment 20 to have the same structure, thereby reducing manufacturing costs.

[0022] The convex portions 22 and concave portions 24 are formed in a wavy shape that is continuous with each other. In other words, the side of the segment 20 is processed into a wavy shape, so that the semicircular convex portions 22 and the semicircular arc-shaped concave portions 24 are alternately continuous with each other. In this specification, the term "wavy shape" refers to a shape in which mountain portions whose tips are formed in a semicircular shape and valley portions whose bottoms are formed in a semicircular arc shape are alternately continuous with each other.

[0023] Specifically, each protrusion 22 is formed in a mountain shape extending toward the recess 24 of the adjacent segment 20, and its tip is formed in a semicircular shape without a corner. Furthermore, each protrusion 22 has approximately the same curvature as the recess 24 of the adjacent segment 20 and approximately the same length as the depth of the recess 24. Meanwhile, each recess 24 is formed in a valley shape extending in a direction away from the protrusion 22 of the adjacent segment 20, and its bottom is formed in a semicircular arc shape without a corner. Furthermore, each recess 24 has approximately the same curvature as the protrusion 22 of the adjacent segment 20 and approximately the same depth as the length of the protrusion 22.

[0024] The tip of each protrusion 22 is gently inclined radially inward. Since the tip of each protrusion 22 is an inclined surface in this manner, it is possible to reduce the possibility that the coil body C will enter and be wound into a gap generated between adjacent segments 20 when the mandrel 10 is expanded. In addition, since the pressing force of the coil pressing roller 30 can be received by the surface, there is also an advantage that the coil body C is less likely to be damaged. Furthermore, there is also an advantage that it is possible to prevent each protrusion 22 from protruding onto the outer circumferential surface when the mandrel 10 is contracted.

[0025] Fig. 4 is an enlarged schematic view showing the vicinity of a position corresponding to the coil pressing roller of the segment shown in Fig. 3. Fig. 7 is a schematic view showing a state in which the uncoiler according to this embodiment is used. Furthermore, as shown in Figs. 4 and 7, in each segment 20, the recess 24 or the protrusion 22 formed at the position corresponding to the coil pressing roller 30 is a narrow recess 25b or a narrow protrusion 25a having a width narrower than the width of the coil pressing roller 30. Specifically, on the side where the recess 24 is formed at the position corresponding to the coil pressing roller 30, the recess 24 is narrowly formed to be the narrow recess 25b. Also, on the same side, a pair of protrusions 22 sandwiching the narrow recess 25b are both narrowly formed to be the narrow protrusions 25a. On the other hand, on the side where the protrusion 22 is formed at the position corresponding to the coil pressing roller 30, the protrusion 22 is narrowly formed to be the narrow protrusion 25a. Also, on the same side, a pair of recesses 24 sandwiching the narrow protrusion 25a are both narrowly formed to be the narrow recess 25b. However, without being limited thereto, the pair of protrusions 22 sandwiching the narrow recess 25b need not be the narrow protrusion 25a, and the pair of recesses 24 sandwiching the narrow protrusion 25a need not be the narrow recess 25b.

[0026] FIG. 5 is a schematic diagram showing the width of each component of the segments shown in FIG. 3 and the width of the coil pressing roller. 5, the narrow convex portion 25a and the narrow recessed portion 25b have a shape narrower in width than the recessed portions 24 or the convex portions 22 formed at other positions. On the other hand, the convex portions 22 and the recessed portions 24 formed at positions other than the position corresponding to the coil pressure roller 30 have a width that is approximately the same as or wider than the width R1 of the coil pressure roller 30.

[0027] On the side where the recess 24 (narrow recess 25b) is formed at a position corresponding to the coil pressing roller 30, the width X2 at 1 / 2 the depth H2 of the narrow recess 25b is shorter than the width R1 of the coil pressing roller 30, as shown in Figs. 4 and 5. Specifically, the width X2 at 1 / 2 the depth H2 of the narrow recess 25b is preferably less than 110% of the width R1 of the coil pressing roller 30, more preferably less than 105%, and even more preferably less than 100%, from the viewpoint of generating a frictional force to prevent the coil end from dropping. Moreover, the width X2 is preferably 50% or more of the width R1 of the coil pressing roller 30, more preferably 55% or more, and even more preferably 60% or more. In this specification, the depth H2 of the narrow recess 25b refers to the depth from the apex of the adjacent protrusion 22 (narrow protrusion 25a in this embodiment) to the bottom apex of the narrow recess 25b, as shown in Figures 4 and 5.

[0028] 4 and 5, the apex-to-apex distance VL1 between a pair of convex parts 22 (a pair of narrow convex parts 25a in this embodiment) sandwiching the narrow recess 25b is longer than the width R1 of the coil pressing roller 30. Specifically, the apex-to-apex distance VL1 between the pair of convex parts 22 sandwiching the narrow recess 25b is preferably less than 200% of the width R1 of the coil pressing roller 30, more preferably less than 175%, and even more preferably less than 150%, from the viewpoint of generating a frictional force to reliably prevent the coil end from dropping. Moreover, the apex-to-apex distance VL1 is preferably 100% or more of the width R1 of the coil pressing roller 30, more preferably 105% or more, and even more preferably 110% or more, from the viewpoint of shortening the processing time during cutting processing of the segment 20 and reducing the manufacturing cost.

[0029] Furthermore, on the side where the convex portion 22 (narrow convex portion 25a) is formed at a position corresponding to the coil pressing roller 30, the width X1 at 1 / 2 the height H1 of the narrow convex portion 25a is shorter than the width R1 of the coil pressing roller 30. Specifically, the width X1 at 1 / 2 the height H1 of the narrow convex portion 25a is preferably less than 110% of the width R1 of the coil pressing roller 30, more preferably less than 105%, and even more preferably less than 100%, from the viewpoint of generating a frictional force to ensure that the coil end does not fall. Moreover, the width X1 is preferably 50% or more of the width R1 of the coil pressing roller 30, more preferably 55% or more, and even more preferably 60% or more. Furthermore, the width X1 is preferably formed slightly narrower than the width X2 at 1 / 2 the depth H2 of the narrow recess 25b, from the viewpoint of meshing the adjacent narrow convex portions 25a and narrow recesses 25b to eliminate gaps. In this specification, the height H1 of the narrow convex portion 25a refers to the height from the bottom apex of the adjacent recess 24 (narrow recess 25b in this embodiment) to the apex of the narrow convex portion 25a, as shown in Figures 4 and 5.

[0030] Furthermore, the distance VL2 between the bottom apexes of the pair of recesses 24 (the pair of narrow recesses 25b in this embodiment) sandwiching the narrow protrusion 25a is longer than the width R1 of the coil pressing roller 30. Specifically, the distance VL2 between the bottom apexes of the pair of recesses 24 sandwiching the narrow protrusion 25a is preferably less than 200% of the width R1 of the coil pressing roller 30, more preferably less than 175%, and even more preferably less than 150%, from the viewpoint of generating a frictional force to reliably prevent the end of the coil body C from dropping. Moreover, the distance VL2 between the bottom apexes is preferably 100% or more of the width R1 of the coil pressing roller 30, more preferably 105% or more, and even more preferably 110% or more, from the viewpoint of shortening the processing time during cutting processing of the segment 20 and reducing manufacturing costs.

[0031] The height H1 of the narrow convex portion 25a is preferably 90% or more, more preferably 100% or more, and even more preferably 110% or more of the width X1 at the 1 / 2 point of the height H1 of the narrow convex portion 25a, from the viewpoint of eliminating gaps by engaging the concave portions 24 and the convex portions 22 of adjacent segments 20. In addition, the depth H2 of the narrow concave portion 25b is preferably formed to be approximately the same as the height H1 of the narrow convex portion 25a.

[0032] In addition, from the viewpoint of more reliably establishing the correspondence relationship between each of the above-mentioned components of the segment 20 and the width R1 of the coil pressing roller 30, that is, from the viewpoint of reliably generating frictional force when pressing the narrow recess 25b near the width X2 at the half point of the depth H2 of the coil body C while the coil pressing roller 30 presses the narrow protrusion 25a of the segment 20 near the width X1 at the half point of the height H1 of the narrow protrusion 25a, it is preferable that the diameter of the mandrel 10 when expanded is larger than the diameter of the coil pressing roller 30. Specifically, it is preferable that the diameter of the mandrel 10 when expanded is 125% or more of the diameter of the coil pressing roller 30. In addition, from the viewpoint of reducing the cost of manufacturing the segment 20, it is preferable that the diameter of the mandrel 10 when expanded is less than 250%.

[0033] In this embodiment, as shown in Figure 6 etc., the mandrel 10 has four segments 20 of the same shape and size, but this is not limited to this and may be configured to use three or less or five or more segments 20 of the same shape and size, or may be configured to use multiple segments 20 of different shapes.

[0034] The coil pressing roller 30 is configured to be able to come into contact with the outer periphery of the coil body C mounted on the mandrel 10. Specifically, the coil pressing roller 30 is provided above the mandrel 10, configured to be able to move in a direction approaching and moving away from the coil body C held by the mandrel 10, and configured to be able to come into contact with the coil body C by moving in accordance with the position of the coil body C. The coil pressing roller 30 has a width that is at least the same as or narrower than the material width of the coil body C. Specifically, the width R1 of the coil pressing roller 30 is formed within a range of 100 mm or more and 250 mm or less.

[0035] Moreover, the coil pressing roller 30 includes a drive unit (not shown) and is configured to be axially rotatable. Specifically, the coil pressing roller 30 is configured to rotate in response to the rotation of the main shaft portion 12 that holds the coil body C while in contact with the coil body C, thereby suppressing distortion of the coil body C being unwound. Here, it is preferable that the coil pressing roller 30 is configured to be capable of rotating faster than the rotation of the main shaft portion 12. By being configured in this manner, the coil pressing roller 30 has the advantage that the coil body C can be stably unwound downward while preventing natural unraveling.

[0036] Furthermore, the coil pressure roller 30 is configured to stop rotating at the end of the coil body C, and to sandwich the coil body C between the segment 20 and the coil pressure roller 30. For example, the mandrel 10 is configured to detect when the remaining amount of the coil body C is low and at least one segment 20 is exposed, and to stop rotating, and the coil pressure roller 30 is configured to stop rotating in conjunction with the stop of rotation of the mandrel 10, thereby sandwiching the coil body C. The configuration of the coil pressure roller 30 is not limited to the above-mentioned configuration, and various known configurations can be applied.

[0037] The side guide 40 is configured to support the ends of the coil body C in the width direction when the coil body C is unwound, thereby preventing the coil body C from dispersing in the width direction during unwinding. The side guide 40 is configured to be operable to a width determination position or an elevated open position with respect to the mandrel 10, and is configured to support the coil body C from the width direction by lowering to the circumferential width determination position of the mandrel 10 after inserting the coil body C into the mandrel 10. Note that, in this embodiment, a plurality of side guides 40 are provided on the uncoiler 1, but this is not limited thereto, and it is not necessary to provide a plurality of side guides. The configuration of the side guide 40 is not limited to that of this embodiment, and various known configurations can be adopted.

[0038] [Uses of the mandrel according to this embodiment] FIG. 8 is a schematic diagram showing a plate material supplying device including a mandrel according to this embodiment. The mandrel 10 according to the present embodiment can be used in various plate material supplying devices. For example, the mandrel 10 according to the present embodiment can be used in a plate material supplying device LL of a leveller feeder type equipped with a leveller feeder 200 as shown in FIG. 8. The plate material supplying device LL of a leveller feeder type is configured to give a plate material unwound from a coil body C a loop-shaped slack in a loop pit 100, guide the plate material to the leveller feeder 200, and send the plate material to a press device (not shown) while correcting distortions of the plate material. Note that the loop pit 100 and the leveller feeder 200 can be of known configurations, and therefore detailed explanations thereof will be omitted.

[0039] FIG. 9 is a schematic diagram showing another plate material supplying device including a mandrel according to the present embodiment. The mandrel 10 according to the present embodiment can also be used in a tandem-type workpiece supplying device TL as shown in FIG. 9. The tandem-type workpiece supplying device TL is configured to pay out a workpiece from a coil body C by a leveller 300, give the paid-out workpiece a loop-shaped slack in a loop pit 100 provided behind the leveller 300, and then guide the paid-out workpiece to a roll feeder 400, and send the workpiece to a press device (not shown) while correcting distortion of the coil body C. In the tandem-type workpiece supplying device TL, the workpiece is paid out from the coil body C in a state where a predetermined tension is applied by the leveller 300, so that it is not necessary to use a coil pressing roller 30. It should be noted that the loop pit 100, the leveller 300, and the roll feeder 400 can be of known configurations, and therefore detailed explanations thereof will be omitted.

[0040] As described above, the mandrel 10 of this embodiment is a common component that can be used not only in a straightener feeder type plate material supplying device LL, which constantly presses down the coil body C with the coil pressing roller 30 while feeding it out, but also in a tandem type plate material supplying device TL, etc., which does not need to constantly press down the coil body C with the coil pressing roller 30 while feeding it out.

[0041] [Advantages of the uncoiler and mandrel according to this embodiment] As described above, the uncoiler 1 according to this embodiment includes a mandrel 10 configured to be inserted into a central hole of a coil body C having a central hole and capable of holding the coil body C on its peripheral surface, and a coil pressing roller 30 configured to be able to abut against the outer periphery of the coil body C attached to the mandrel 10. The mandrel 10 has a plurality of segments 20 forming an outer periphery, and each of the plurality of segments 20 is configured to be able to move in the radial direction. Each segment 20 has a plurality of alternating protrusions 22 and recesses 24 formed along the axial direction on its side, and the protrusions 22 and recesses 24 are configured to mutually mesh with the recesses 24 and protrusions 22 formed in adjacent segments 20. In each segment, the recesses 24 or protrusions 22 formed at a position corresponding to the coil pressing roller 30 are narrow recesses 25b or narrow protrusions 25a having a width shorter than the width R1 of the coil pressing roller 30.

[0042] And, by having such a configuration, the uncoiler 1 according to the present embodiment has an advantage that it is possible to stabilize the pressing force of the coil body C by the coil pressing roller 30 while suppressing the manufacturing cost. That is, according to the uncoiler 1 according to the present embodiment, since the pressing force of the coil pressing roller 30 can be stably received by the narrow concave portion 25b or the narrow convex portion 25a, it is possible to prevent the coil pressing roller 30 from idling and suppress the coil pressing roller 30 from falling into the gap generated between the segments 20. Further, according to the uncoiler 1 according to the present embodiment, the processing can be simplified compared to the case where all of the convex portions 22 and the concave portions 24 are narrow concave portions 25b and narrow convex portions 25a, and the manufacturing cost can be suppressed.

[0043] Also, in the uncoiler 1 according to the present embodiment, the convex portions 22 and the concave portions 24 are formed in a continuous wave shape with each other. By being configured in this way, the uncoiler 1 according to the present embodiment has an advantage that the processing time can be shortened during cutting processing and the manufacturing cost can be further suppressed.

[0044] Furthermore, in the uncoiler 1 according to the present embodiment, the narrow concave portion 25b is formed such that the width X2 at the 1 / 2 point of the depth H2 is shorter than the width R1 of the coil pressing roller 30. Also, in the uncoiler 1 according to the present embodiment, the narrow convex portion 25a is formed such that the width X1 at the 1 / 2 point of the height H1 is shorter than the width R1 of the coil pressing roller 30. By being configured in this way, the uncoiler 1 according to the present embodiment has an advantage that it is possible to further stabilize the pressing force of the coil body C by the coil pressing roller 30.

[0045] [Modification Example] As described above, the preferred embodiments of the present invention have been described, but the technical scope of the present invention is not limited to the scope described in the above-described embodiments. Various changes or improvements can be made to the above-described embodiments.

[0046] For example, in the above embodiment, the protrusions 22 and the recesses 24 are described as being formed in a wave shape that is continuous with each other, but this is not limited thereto, and they may be formed in, for example, a comb-tooth shape.

[0047] In the above embodiment, the narrow recess 25b has been described as having a width X2 at a half point of the depth H2 that is shorter than the width R1 of the coil press roller 30, but the present invention is not limited to this.

[0048] Furthermore, in the above embodiment, the narrow convex portion 25a has been described as having a width X1 at a point half the height H1 that is shorter than the width R1 of the coil presser roller 30, but this is not limiting. [Explanation of symbols]

[0049] 1: Uncoiler 10: Mandrel 12: Main shaft part 16: Connection part 20: Segment 22: Convex 24: Recess 25a: Narrow convex part 25b: Narrow recess 30: Coil pressing roller 40: Side guide 100: Loop Pit 200: Straightener feeder 300: Leveller C: Coil body LL: Board supply device TL: Plate material feeding device

Claims

1. A mandrel inserted into the central hole of a coil body having a central hole and configured to hold the coil body on its circumferential surface, a coil pressing roller configured to abut against the outer circumference of the coil body mounted on the mandrel, and comprising, the mandrel has a plurality of segments forming an outer circumferential surface, the plurality of segments are each configured to be movable in the radial direction, each segment has a plurality of convex portions and concave portions alternately formed along the axial direction on its side, the convex portion and the concave portion are configured to mesh with the concave portion and the convex portion formed on the adjacent segment, and in each segment, the concave portion or the convex portion formed at a position corresponding to the coil pressing roller is a narrow concave portion or a narrow convex portion having a width shorter than the width of the coil pressing roller Uncoiler.

2. The convex portion and the concave portion are formed in a continuous wave shape with each other. The uncoiler according to Claim 1.

3. The width of the narrow concave portion at the midpoint of its depth is shorter than the width of the coil pressing roller. The uncoiler according to Claim 1 or 2.

4. The width at the midpoint of the depth of the narrow concave portion is 50% or more and less than 110% of the width of the coil pressing roller. The uncoiler according to Claim 3.

5. The width of the narrow convex portion at the midpoint of its height is shorter than the width of the coil pressing roller. The uncoiler according to Claim 1 or 2.

6. The width at the midpoint of the height of the narrow convex portion is 50% or more and less than 110% of the width of the coil pressing roller. The uncoiler according to Claim 5.

7. A mandrel attachable to an uncoiler provided with a coil pressing roller configured to abut against the outer circumference of a coil body, inserted into the central hole of the coil body and having a plurality of segments forming an outer circumferential surface capable of holding the coil body, the segments are each configured to be movable in the radial direction, each segment has a plurality of convex portions and concave portions alternately formed along the axial direction on its side, the convex portion and the concave portion are configured to mesh with the concave portion and the convex portion formed on the adjacent segment, and in each segment, the concave portion or the convex portion formed at a position corresponding to the coil pressing roller is a narrow concave portion or a narrow convex portion having a width shorter than the width of the coil pressing roller. Mandrel.

8. The convex portion and the concave portion are formed in a wave shape that is continuous with each other. The mandrel according to claim 7.

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