Material feeding device

Abstract

To provide a material supply device for a press that does not require power means separately from power mean of a press with a simple structure.SOLUTION: A material supply device 4 includes a supporting roller 41, a magnet roller 12, a rotary shaft 12a of the magnet roller 12, a diameter expanding member 12e that cannot rotate in a direction coaxially with the rotary shaft 12a and in which the magnet roller 12 carries an outermost part M2 and can rotate in the opposite direction, a wire 15 that is fixed to the diameter expanding member 12e at one end and is fixed to a slide 22 at the other end, a movable pulley 14 that is wound around the wire 15 and whose movable pulley shaft 14a is energized in the opposite direction to the carrying direction D, a rotation energizing device 12d that energizes the diameter expanding member 12e to rotate, and a cut-and-raised portion M3 provided at the outermost part M2. If the slide 22 rises, the magnet roller 12 rotates and carries the outermost part M2 until the cut-and-raised portion M3 abuts on a part of a mold 3. If the slide 22 rises, the magnet roller 12 stops rolling and the movable pulley shaft 14a moves in the carrying direction D.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a material supplying device, and more particularly to a material supplying device for a press that supplies the final end portion of a material that can no longer be supplied by a leveler feeder between press dies. [Background technology]

[0002] Conventionally, press forming is performed by feeding material such as coiled steel sheet between press dies using a leveler feeder. In this case, if the final end of the material comes off the leveler feeder during the final stage of material feeding, the material cannot be fed between the press dies. To effectively utilize the final end of the material, which is the section between the final end of the material and the press dies, the final end of the material feeding device described in Patent Document 1 uses an air cylinder to hold down the final end of the material on a free roller conveyor, and then uses a rodless cylinder to move it in that state to the die stopper. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-154423 Summary of the Invention [Problem to be solved by the invention]

[0004] The material final end feeding device described in the above-mentioned Patent Document 1 has the problem that it requires a power means such as compressed air to operate an air cylinder or a rodless cylinder in addition to the power means for driving the press, and the device tends to become large.

[0005] In view of the above problems, an object of the present invention is to provide a material supply device for a press which has a simple structure and does not require a power means, such as compressed air, separate from the power means for driving the press. [Means for solving the problem]

[0006] The first invention of the present invention is a material supplying device that supplies a material end portion remaining between a leveler feeder that supplies material to a press die and the die, the material supplying device comprising: a roller that places the material end portion so as to be transportable toward the die; a magnetic roller that can transport the material end portion toward the die by rotating while contacting from above the material end portion placed on the roller; a rotation shaft that rotatably supports the magnetic roller and has an axis that extends perpendicular to the transport direction of the material end portion; a cylindrical diameter expanding member that is attached coaxially to the rotation shaft and cannot rotate about the rotation shaft in the rotation direction in which the magnetic roller transports the material end portion toward the die but can rotate in the direction opposite to the rotation direction; one end fixed to a portion of the circumferential direction of the diameter expanding member and the other end attached to an upper die of the die or a slide to which the upper die is attached; a fixed wire; a movable pulley that is hung on the wire and has a pulley shaft that extends parallel to the rotation shaft and is urged in the opposite direction to the conveying direction of the material terminal portion; rotation urging means that rotatably urges the diameter expanding member in the direction opposite to the rotation direction; and a stopper that is provided on the material terminal portion and abuts against a part of the mold to stop conveyance of the material terminal portion, wherein when the wire is wound around the diameter expanding member from the one end side, the slide rises, causing the diameter expanding member to rotate against the urging force of the rotation urging means, thereby rotating the magnet roller via the rotation shaft and conveying the material terminal portion until the stopper abuts against a part of the mold, and when the upper mold rises further, the magnet roller stops rotating and the pulley shaft of the movable pulley moves in the conveying direction of the material terminal portion.

[0007] According to the first aspect of the present invention, the wire is pulled by the movement of the press slider, and the magnet roller rotates via the diameter expanding member and the rotating shaft, thereby supplying the end portion of the material to the die. In this case, the material supply device can supply the end portion of the material to the die without using a power means separate from the driving power of the press, and has a simple structure because it does not use large parts such as a rodless cylinder.

[0008] The second invention of the present invention is characterized in that, in the first invention, when the leveler feeder is supplying the material to the mold, the rotation shaft is raised so that the magnet roller does not come into contact with the material.

[0009] According to the second invention, the material supply device of the press is used only when supplying the end portion of the material remaining between the leveler feeder and the mold between the molds, making it less likely to malfunction or cause other problems.

[0010] A third aspect of the present invention is characterized in that, in the first or second aspect, the press is a progressive press, and the stopper is a cut-and-raised portion press-formed into the material in the first step of press forming, and is cut off or bent back in the second step.

[0011] According to the third aspect of the present invention, the stopper is formed by pressing into the material sandwiched between the dies, so it is simple and convenient to provide a portion in the dies against which the stopper abuts. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of a progressive press apparatus including a material supplying device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the material supply device of the embodiment. [Figure 3] 1 is a plan view of the material supply device of the embodiment, in which the free roller conveyor 43 is omitted. [Figure 4] 1 is a front view of the material supply device of the embodiment, in which the free roller conveyor 43 is omitted. DETAILED DESCRIPTION OF THE INVENTION

[0013] A material supplying device 4 according to one embodiment of the present invention will be described with reference to Figs. 1 to 4. Fig. 1 shows a side view of a progressive press device 1. The progressive press device 1 has a press machine 2, a die 3, a material supplying device 4, a leveler feeder 5, and an uncoiler 6. In each figure, the material conveying direction D is indicated by an arrow. Here, the press machine 2 corresponds to the "press" in the claims.

[0014] Press machine 2 has bolster 21 and slide 22 that moves up and down relative to bolster 21. Die 3 is a progressive die in which concaves and convexes for a plurality of press processes are created in one die and processed by being fed sequentially, and has lower die 31 and upper die 32. With lower die 31 attached to bolster 21 and upper die 32 attached to slide 22, slide 22 moves up and down to open and close upper die 32 relative to lower die 31, and press-process material M sandwiched between them.

[0015] A cut-and-raised portion 33 is formed on the side of the mold 3 opposite the conveying direction D and closer to the material supply device 4. This cut-and-raised portion 33 forms a rectangular cut-and-raised portion M3 in the material M when viewed from the side (perpendicular to the plane of the paper in FIG. 1) during press working. Specifically, the cut-and-raised portion 33 is composed of a forming protrusion 32a formed on the upper mold 32 and a forming recess 31a formed on the lower mold 31. When the material M is fed in the conveying direction D, the formed cut-and-raised portion M3 abuts against a stopper wall 31b of the lower mold 31, stopping the conveyance of the material M and bending it back to its original flat state through press working. The distance from the forming recess 31a to the stopper wall 31b corresponds to one step of the progressive press. The cut-and-raised portion M3 contributes to advancing the material M in the conveying direction D one step at a time. Here, the cut-and-raised portion M3 and the stopper wall 31b correspond to the "stopper" and "part of the mold" in the claims, respectively.

[0016] As shown in Figure 1, the uncoiler 6 is a device that unwinds material M, such as a steel sheet, wound in a coil shape and supplies it to the leveler feeder 5. The leveler feeder 5 is a device that passes material M between rolls to remove strain and make it into a flat plate, and sends out material M in the conveying direction D by the rotation and frictional force of the rolls.

[0017] As shown in Figure 1, the material supply device 4 has support rollers 41 on which the material M is placed and supported, and a feed device 10 that feeds an end portion M2 of the material M, which has come off the leveler feeder 5 and can no longer be fed by the leveler feeder 5, in the conveying direction D. Here, the support rollers 41 and the end portion M2 correspond to the "roller" and "material terminal portion" in the claims, respectively.

[0018] The support roller 41 has a base 42 and a free roller conveyor 43 on the upper surface of the base 42, which has multiple free rollers arranged thereon whose axes extend in a direction perpendicular to the conveying direction D (a direction perpendicular to the paper surface in Figure 1) and rotate freely.

[0019] As shown in FIGS. 1 to 4, the feed device 10 includes a base plate 11, a magnet roller 12, a fixed pulley 13, a movable pulley 14, and a wire 15.

[0020] The base plate 11 is a rectangular plate material whose minor axis direction coincides with the conveying direction D when viewed from above, and has a rectangular opening 11a in which the magnet roller 12 is disposed in the approximate center. The end of the base plate 11 opposite the conveying direction D is supported above the support roller 41 by a support shaft 11b extending in the major axis direction. More specifically, the support shaft 11b is rotatably supported by a pair of rectangular plate-shaped first brackets 42a fixed to a base 42 of the support roller 41. A pair of support legs 11c are disposed at the end of the base plate 11 in the conveying direction D, extending downward in the major axis direction. This allows the base plate 11 to be held parallel to and spaced apart from the uppermost end portion M2 of the support roller 41. By operating a lifting means (not shown), the end of the base plate 11 in the conveying direction D is lifted upward about the support shaft 11b relative to the support roller 41, and can be maintained in the lifted state shown by the two-dot chain line in FIG. 1 .

[0021] As clearly shown in FIGS. 2 and 3 , the magnet roller 12 is a cylindrical roller made of a permanent magnet, and is disposed within an opening 11a of the base plate 11 by a rotation shaft 12a extending perpendicular to the conveyance direction D, and is rotatably attached to the base plate 11. Specifically, the rotation shaft 12a is rotatably supported relative to the base plate 11 by a pair of bearings 12c disposed at the longitudinal ends of the opening 11a on the top surface of the base plate 11. A rotation biasing device 12d is disposed between the tip of one end of the rotation shaft 12a and the base plate 11. The rotation biasing device 12d is fixed to the base plate 11 via a second bracket 11d whose case is L-shaped in top view and whose case is fixed to the base plate 11. An expanding diameter member 12e is attached to the surface of the rotation biasing device 12d facing the magnet roller 12. The expanding diameter member 12e is rotatable clockwise in FIG. 2 but not counterclockwise relative to the rotation shaft 12a. The diameter expanding member 12e is a cylindrical member with a diameter larger than the diameter of the rotary shaft 12a, and is designed to have a wire 15 wound around it as described below. By changing the diameter of the diameter expanding member 12e, it is possible to change the amount of the end portion M2 of the material M fed in the conveying direction D by the magnetic roller 12. Here, the rotational biasing device 12d corresponds to the "rotational biasing means" in the claims.

[0022] 2 to 4, the fixed pulley 13 is disposed such that its shaft, the fixed pulley shaft 13a, extends parallel to the rotating shaft 12a, directly above the rotating shaft 12a and the diameter-expanding member 12e between the rotation biasing device 12d and the bearing 12c. Specifically, the fixed pulley shaft 13a is attached to the opening side of the U-shape by a third bracket 11e that is substantially U-shaped when viewed from the conveying direction D, and is supported by the base plate 11. The diameter of the fixed pulley 13 is not particularly limited, but in this embodiment, it is approximately 1 / 3 the diameter of the magnet roller 12. Both axial ends of the fixed pulley 13 are disk-shaped with an expanded diameter, which makes it difficult for the wire 15 wound around the fixed pulley 13 to fall off, as will be described later.

[0023] 2 to 4, the movable pulley 14 is disposed such that its shaft, that is, the movable pulley shaft 14a, extends vertically between the rotating shaft 12a and the fixed pulley shaft 13a and parallel to the rotating shaft 12a and the fixed pulley shaft 13a. Furthermore, when viewed from above, the movable pulley shaft 14a is disposed between the fixed pulley 13 and the end of the diameter-expanding member 12e on the magnet roller 12 side in a direction perpendicular to the conveying direction D, and is disposed such that the distance between the rotating shaft 12a and the fixed pulley shaft 13a varies in the conveying direction D. Specifically, the movable pulley shaft 14a is disposed vertically on a movable pulley base plate 14b, which is attached to a fourth bracket 11f on the base plate 11 so as to be slidable in the conveying direction D relative to the fourth bracket 11f, which is disposed on the base plate 11 so as to be perpendicular to the upper surface of the base plate 11 and extend in the conveying direction D. The fourth bracket 11f is supported by a pair of support members 11g aligned in the conveying direction D so as to maintain a perpendicular state to the upper surface of the base plate 11 near the end of the diameter expansion member 12e on the magnet roller 12 side in a top view. A protrusion 11f1 having a substantially C-shaped cross section extending in the conveying direction D is formed on the surface of the fourth bracket 11f facing the diameter expansion member 12e slightly above the center in the up-down direction. The end of the fourth bracket 11f opposite the conveying direction D is bent toward the diameter expansion member 12e, and a spring locking portion 11f2 that locks one end of the coil spring 14c is formed at its upper end. The movable pulley base plate 14b has a substantially square shape with one side aligned with the conveying direction D when viewed from a direction perpendicular to the conveying direction D, and is disposed opposite the surface of the fourth bracket 11f facing the diameter expansion member 12e. A groove 14b1 is formed on the surface facing the fourth bracket 11f, the groove 14b1 slidably fitting onto the protrusion 11f1 and extending in the conveying direction D. When the movable pulley base plate 14b is placed facing the fourth bracket 11f and the groove 14b1 is fitted onto the protrusion 11f1, the movable pulley base plate 14b becomes slidable in the conveying direction D relative to the fourth bracket 11f. A spring locking portion 14b2 that protrudes upward is formed on the upper edge of the movable pulley base plate 14b. The other end of the coil spring 14c is locked to the spring locking portion 14b2. As a result, the movable pulley base plate 14b is pulled in the opposite direction to the conveying direction D relative to the fourth bracket 11f by the biasing force of the coil spring 14c, and comes into contact with a stop wall 11h provided on the fourth bracket 11f, thereby stopping its movement.The movable pulley 14 is rotatably attached to the movable pulley shaft 14a erected on the surface of the movable pulley base plate 14b opposite to the fourth bracket 11f. The diameter of the movable pulley 14 is not particularly limited, but in this embodiment it is set to about 1 / 3 the diameter of the magnet roller 12. Both ends of the movable pulley 14 in the axial direction are made into a disk shape with an enlarged diameter, so that the wire 15 wound around the movable pulley 14 is less likely to fall off, as will be described later. Here, the movable pulley shaft 14a corresponds to the "pulley shaft" in the claims.

[0024] 2 to 4, one end of the wire 15, i.e., a lower end 15a, is fixed to a portion of the outer peripheral surface of the diameter expansion member 12e, and the other end, i.e., an upper end 15b, is fixed to a hook member 15c. The wire 15 is wound around the diameter expansion member 12e counterclockwise in FIG. 2, starting from the lower end 15a, and is also looped around the movable pulley 14 clockwise from below and around the fixed pulley 13 counterclockwise from below, extending upward, with the upper end 15b fixed to the hook member 15c. The hook member 15c is engaged with a hook portion provided at the tip of the wire engaging portion 22a extending from the slide 22 in the direction opposite to the conveyance direction D. In this state, the wire 15 is tensioned by the rotational biasing force of the diameter expansion member 12e by the rotational biasing device 12d and the traction force of the movable pulley 14 by the coil spring 14c.

[0025] The operation of the material supply device 4 will now be described. As shown in FIG. 1, when the coiled material M is held by the uncoiler 6, the material M is unwound and supplied to the leveler feeder 5, which then sends it out in the conveying direction D and presses it. At this time, the base plate 11 of the feeder 10 is in a lifted state shown by the two-dot chain line in FIG. 1, with the end of the base plate 11 in the conveying direction D being lifted upward around the support shaft 11b by the operation of the lifting means. As a result, the magnetic roller 12 is not in contact with the material M, and the feeder 10 is not operating. At this time, it is recommended that the hook member 15c of the wire 15 be disengaged from the hook portion provided at the tip of the wire engaging portion 22a to avoid unnecessary operation of the feeder 10.

[0026] As shown in Figure 1, when the extreme end M1 of the material M comes off the leveler feeder 5 and can no longer be fed by the leveler feeder 5, the operation of the lifting means for the base plate 11 is stopped and the base plate 11 is rotated clockwise in Figure 1 about the support shaft 11b so that it is held parallel to and spaced above the extreme end M2. Then, with the slide 22 lowered and the upper mold 32 closed relative to the lower mold 31, the hook member 15c of the wire 15 is engaged with the hook portion provided at the tip of the wire engaging portion 22a. At this time, the magnetic roller 12 abuts against the extreme end M2, and as it rotates, it can feed the extreme end M2 in the conveying direction D.

[0027] When the press 2 is operated and the slide 22 is raised, the wire 15 is pulled upward, and the portion wound around the diameter expansion member 12e is unwound, causing the diameter expansion member 12e to rotate in the counterclockwise direction R about the rotating shaft 12a in FIG. 2. Since the diameter expansion member 12e is attached to the rotating shaft 12a so as not to rotate counterclockwise in FIG. 2, the rotating shaft 12a rotates counterclockwise in FIG. 2, and simultaneously rotates the magnetic roller 12 counterclockwise about the rotating shaft 12a. This feeds the end portion M2 in the conveying direction D. When the cut-and-raised portion M3 formed in the end portion M2 abuts against the stopper wall 31b, stopping the conveying of the end portion M2, the tension in the wire 15 increases with the rotation of the magnetic roller 12 stopped. To relieve the increased tension in the wire 15, the movable pulley 14 moves in the conveying direction D against the biasing force of the coil spring 14c.

[0028] 2, if the vertical movement dimension of the slide 22 is Y, the diameter of the diameter expansion member 12e is R1, and the diameter of the magnetic roller 12 is R2, then without using the movable pulley 14, the feed dimension X0 of the endmost portion M2 is Y × R2 / R1. Here, in order to make the actual feed dimension X equal X0, it is necessary to precisely adjust the variable R1, which creates difficulties. Therefore, it is convenient to set X to be smaller than X0, and then absorb the excess of Y with the movement of the movable pulley 14. Based on this perspective, R1, R2, and the sliding amount of the movable pulley shaft 14a are determined.

[0029] When the slide 22 of the press machine 2 descends for the next press operation, the movable pulley shaft 14a of the movable pulley 14 first moves in the direction opposite to the conveying direction D due to the biasing force of the coil spring 14c. Then, the end of the movable pulley base plate 14b opposite the conveying direction D abuts against the stop wall 11h, stopping its movement. As the slide 22 descends, the wire 15 is wound onto the diameter-expanding member 12e. At this time, the magnetic roller 12 is stopped from rotating together with the rotating shaft 12a, and no force is applied to the end portion M2 of the material M. Because the diameter-expanding member 12e is biased to rotate by the rotation biasing device 12d, the wire 15 is wound while maintaining tension, preventing slack. The above operation is then repeated.

[0030] The present embodiment configured as described above has the following advantages. The material supply device 4 can supply the end portion M2 of the material M to the die 3 by the movement of the slide 22 of the press 2 pulling the wire 15 and rotating the magnetic roller 12 via the diameter expanding member 12e and the rotating shaft 12a. In this case, the material supply device 4 can supply the end portion M2 to the die 3 without using any power means separate from the driving power of the press 2, and the structure can be simplified because no large parts such as a rodless cylinder are used.

[0031] Furthermore, when the leveler feeder 5 is supplying the material M to the mold 3, the base plate 11 can be rotated around the support shaft 11b to raise the end portion in the conveying direction D upward, preventing the magnetic roller 12 from coming into contact with the material M. This makes it possible to reduce the likelihood of malfunctions and other problems since the material supply device 4 is only used when supplying the endmost portion M2 of the material M to the mold 3.

[0032] Furthermore, the press 2 is a progressive press, and the cut-and-raised portion M3 press-formed in the end portion M2 in the first process comes into contact with the stopper wall 31b when the end portion M2 is fed in the conveying direction D, thereby stopping the feeding, and the cut-and-raised portion M3 is cut off or bent back in the second process. As a result, the cut-and-raised portion M3 is formed by pressing in the end portion M2 sandwiched between the lower mold 31 and the upper mold 32, and it is simple to provide the lower mold 31 with the stopper wall 31b against which the cut-and-raised portion M3 comes into contact.

[0033] Although specific embodiments have been described above, the present invention is not limited to those external appearances and configurations, and various modifications, additions, and deletions are possible within the scope of the present invention. For example, the following can be mentioned.

[0034] 1. In the above embodiment, when the feed device 10 is not used to transport the end portion M2, the base plate 11 is raised around the support shaft 11b by the operation of the lifting means, so that the end portion in the transport direction D is raised upward. However, this is not limiting, and the feed device 10 may be configured to be placed on the support rollers 41 when used as a removable device.

[0035] 2. In the above embodiment, the press machine 2 is configured as a progressive press machine and the die 3 is configured as a progressive press die, but this is not limited to this and the press machine and die may also be configured as a normal single-molding press machine and die. [Explanation of symbols]

[0036] 1 Progressive press device 2 Press machine (press) 3. Mold 4 Material supply device 5 Leveller feeder 6 Uncoiler 10 Feeder 11 Base plate 12 Magnetic roller 12a Rotation axis 12d Rotational biasing device (rotational biasing means) 12e Expanding member 13 Fixed pulley 13a Fixed pulley shaft 14 Moving pulley 14a Movable pulley shaft (pulley shaft) 15 wires 15a Lower end 15b Upper end 21 Bolster 22 slides 31 Lower mold 31b Stopper wall (part of the mold) 32 Upper mold 41 Support roller 42 Foundation 43 Free Roller Conveyor D Conveying direction M Material M1 extreme end M2 Endmost part (material end part) M3 cut and raise (stopper) R Rotation direction

Claims

1. A material supplying device that supplies a material end portion remaining between a leveler feeder that supplies material to a press die and the die, a roller for placing the material terminal portion so as to be transportable toward the mold; a magnetic roller that can transport the material terminal portion toward the mold by rotating while contacting the material terminal portion placed on the roller from above; a rotation shaft that rotatably supports the magnetic roller and has an axis extending perpendicular to the transport direction of the material terminal portion; a cylindrical diameter expanding member that is attached coaxially to the rotation shaft and cannot rotate about the rotation shaft in the rotation direction in which the magnetic roller transports the material terminal portion toward the mold but can rotate in the direction opposite to the rotation direction; a wire that has one end fixed to a portion of the circumferential direction of the diameter expanding member and the other end fixed to an upper mold of the mold or a slide to which the upper mold is attached; a movable pulley that is hung on the wire and has a pulley shaft that extends parallel to the rotation shaft and is urged in the direction opposite to the transport direction of the material terminal portion; rotational urging means that rotatably urges the diameter expanding member in the direction opposite to the rotation direction; and a stopper that is provided at the material terminal portion and contacts a portion of the mold to stop the transport of the material terminal portion, When the slide is raised in a state in which the wire is wound around the diameter expanding member from the one end side, the diameter expanding member rotates against the biasing force of the rotation biasing means, whereby the magnet roller rotates via the rotation shaft, and the material end portion is conveyed until the stopper abuts against a part of the mold, Furthermore, when the upper die rises, the magnet roller stops rotating and the pulley shaft of the movable pulley moves in the conveying direction of the material terminal portion.

2. 2. The material supplying device according to claim 1, wherein when the material is being supplied to the mold by the leveler feeder, the rotation shaft is raised to prevent the magnet roller from contacting the material.

3. A material supply device according to claim 1 or claim 2, wherein the press is a progressive press, and the stopper is a cut and raised portion press-formed into the material in a first press forming step and is cut off or bent back in a second press forming step.

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