JP6237519B2 - Material sag prevention device - Google Patents

Description

  The present invention is used, for example, in a feed-out device that cuts a plate-shaped steel sheet rewound from a coil material into a predetermined outer shape, and prevents the material end moving in the material feed direction from falling down in the feed-out device. The present invention relates to a material edge sag preventing device that avoids interference with a lower cutting blade (lower blade).

For example, as shown in FIG. 7, the lower mold 103 of the feeding device 100 that cuts the plate steel plate 102 unwound from the coil material 101 into a predetermined outer shape has a material outside the material width of the plate steel plate 102. Cutting blades 104 and 105 are formed to cut the end 102B into an irregular shape. Since the cutting blades 104 and 105 cut the material end 102B of the plate-like steel plate 102 with various contour lines, the material cut by the cutting blades 104A and 105A located on the front side in the material feeding direction (direction of arrow F). There is a possibility that the end 102B passes through the cutting blades 104A and 105A and then hangs down to interfere with the cutting blades 104B and 105B located on the rear side in the material feeding direction.
Therefore, as shown in FIG. 8, the lower die 103 of the conventional feed die is provided with a support guide 203 that supports the material end 102B from below, and includes a cam unit 210 that can move in a direction orthogonal to the material feed direction. The material sag prevention device 200 was mounted.

As shown in FIGS. 8 and 9, the cam unit 210 in the material end-sag prevention device 200 includes a cam base 2012 that is fixed to the lower mold 103, a cam slide 2011 that is horizontally controlled by the cam base 2012, and a cam A passive cam 201 including a compression spring 2013 for pressing the slide 2011 inward of the mold (in the direction of the arrow V1) and a cam driver 202 fixed to an upper mold (not shown) are provided. The support guide 203 is fixed to the cam slide 2011.
As shown in FIG. 9A, when the material end drooping device 200 moves the plate-shaped steel plate 102 in the material feeding direction, the cam slide 2011 is pushed by the compression spring 2013 to move inward of the mold (in the direction of the arrow V1). The support guide 203 supports the material end 102B from below. As shown in FIG. 9B, when cutting the material end 102B of the plate steel plate 102, the cam driver 202 presses the cam slide 2011 against the compression spring 203 to move outward from the die (indicated by the arrow V2). The support guide 203 is moved away from the material end 102B. By separating the support guide 203 from the material end 102B, the cut material end 102B can be discharged out of the mold as scraps 106 and 107 (see FIG. 7).
As described in Patent Document 1, such a cam unit 210 can move the cam slide 2011 and perform drilling, shearing, and bending processes based on the movement of the cam slide 2011, even if forces in various directions are applied to the cam slide 2011. The cam device is provided as a cam device that can reduce the occurrence of backlash, can perform a desired operation over a long period of time, and can reduce maintenance man-hours.

JP-A-8-19825

However, the cam unit employs a structure that increases the strength against various processes such as drilling, shearing, and bending, and the durability against repeated processes, which leads to an increase in the size and cost of the cam unit itself. .
In particular, if a commercially available standard type cam unit is used as the material sag prevention device of the feed device, the strength and durability of the material sag device will be increased more than necessary. There is a problem that the mold cost increases and the storage space increases because the planar size of the mold is unnecessarily enlarged. Further, when the plane size of the lower die in the feeding device is enlarged, there may be a problem that it cannot be mounted on the press machine.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a material sag prevention device that can ensure the durability even with a simple structure at a low cost while allowing the device to be compact. And

In order to achieve the above object, a material end sag preventing device according to the present invention has the following configuration.
(1) A support member that is mounted on a feeding device that cuts a material end outside a material width of a plate-shaped steel plate into a predetermined outer shape and supports the material end when the plate-shaped steel plate is moved in the material feeding direction. And a material sag prevention device comprising a moving member that moves the support member to a non-supporting position that is separated from the material end when cutting the plate steel plate,
The moving member includes an operation member fixed to the upper die of the feeding device and a support shaft that holds the support member and is fixed to the lower die of the feeding device in conjunction with the operation member. And a rocking member that rocks in the material width direction.

In the present invention, the moving member includes an operation member fixed to the upper die of the feeding device and a support shaft that holds the support member and is fixed to the lower die of the feeding device in conjunction with the operation member. Since there is a rocking member that rocks in the material width direction, when the operating member rocks the rocking member in the material width direction and moves the plate-shaped steel plate in the material feed direction in accordance with the up and down of the upper mold The support member can support the material end, and the support member can be separated from the material end when the plate-shaped steel plate is cut. For this reason, the support member supports the material edge before cutting the plate-shaped steel sheet by a material structure with a simple structure that converts the linear motion of the operating member into the rotational motion of the swinging member holding the support member. Thus, the material end moving in the material feeding direction can be prevented from drooping, and when the plate-shaped steel sheet is cut, the support member can be smoothly discharged from the die at the material end cut away from the material end. .
Further, since the swing member only swings in the material width direction around the support shaft fixed to the lower mold, it has excellent durability. Therefore, it is not necessary to increase the strength and size of the swing member as in the conventional cam unit.
Therefore, according to the present invention, it is possible to provide a material sag stopper that can ensure the durability even with a simple structure at a low cost while allowing the apparatus to be compact.

(2) In the material anti-sagging device described in (1),
The operation member is characterized in that a guide surface is formed in which an inclination angle formed by a tangent and a horizontal line at a contact position where the operation member is in contact with the swing member gradually decreases as the operation member is lowered.

In the present invention, the operating member is formed with a guide surface in which the inclination angle formed by the tangent and the horizontal line at the contact position in contact with the swinging member gradually decreases as the operating member is lowered. The rotational movement of the swinging member can be smoothly performed while the impact force on the arm is reduced. In addition, since the inclination angle formed between the tangent and the horizontal line at the contact position where the operation member contacts the swing member gradually decreases as the operation member descends, the support member moves in a direction away from the material end. The moving speed can be slowed initially and then gradually increased. Therefore, the support member can support the material end until immediately before cutting the plate steel plate while reducing the load acting between the operation member and the swinging member.
As a result, the material sag stopper can be formed in a more compact and simple structure.

(3) In the material anti-sagging device described in (2),
The swinging member is characterized in that a rotating body that contacts the guide surface of the operation member is formed to be rotatable.

  In the present invention, since the rotating member that is in contact with the guide surface of the operating member is formed on the swinging member so as to be rotatable, wear at the contact position where the operating member and the swinging member are in contact is further reduced. Can do. Therefore, the wear amount of the guide surface of the operation member and the wear amount of the rotating member of the swing member can be reduced, and the durability of the material end-sag prevention device can be further improved.

(4) In the material anti-sagging device described in any one of (1) to (3),
The swing member includes a table base for fixing the support member, and a pair of parallel link pieces, one end of which is pivotally supported by the table base and the other end of which is pivotally supported by a support shaft fixed to the lower mold. It is a parallel link mechanism provided with these.

  In the present invention, the oscillating member includes a table base for fixing the support member, and a pair of parallel members, one end of which is pivotally supported by the table base and the other end of which is pivotally supported by the support shaft fixed to the lower mold. Since it is a parallel link mechanism provided with the link piece, the support member can swing while supporting the material end in parallel. Therefore, the support member can more reliably prevent the material end from drooping by supporting the material end in parallel.

(5) In the material anti-sagging device described in any one of (1) to (4),
The swing member includes an elastic body that returns the support member to a support position that supports the material end.

  In the present invention, the swing member is provided with an elastic body that returns the support member to the support position that supports the material end. Therefore, if the operation member is separated from the swing member, the swing member is supported by the elastic body. It can be easily returned to the position. Since the swing member can be returned to the support position by the elastic body, no special drive device is required. Therefore, the material sag prevention device can be formed in a more compact and simple structure.

  According to the present invention, it is possible to provide a material anti-sagging device capable of ensuring durability even with a low-cost and simple structure while enabling a compact device.

1 is a schematic cross-sectional view of a material end-sag prevention device according to a first embodiment of the present invention. It is a fragmentary sectional view showing the AA cross section shown in FIG. FIG. 2 is a detailed cross-sectional view of a contact portion between a guide surface of an operation member and a rotating member of a swing member shown in FIG. 1. It is typical sectional drawing of the material end-sag prevention apparatus which concerns on 2nd Embodiment of this invention. It is a fragmentary sectional view showing the BB cross section shown in FIG. FIG. 5 is a detailed cross-sectional view of a contact portion between a guide surface and a swing member of the operation member illustrated in FIG. 4. It is a schematic plan view of a feeding device. It is a perspective view of the conventional material edge sag prevention device with which the lowering apparatus shown in FIG. 7 is mounted. FIG. 9 is a cross-sectional view of the material sag prevention device shown in FIG. 8. FIG. 9A shows a state where the support member supports the material end, and FIG. 9B shows a state where the support member is separated from the material end.

  Next, the material sag prevention device according to the embodiment of the present invention will be described in detail with reference to the drawings. First, the material sag prevention device according to the first embodiment will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view of a material sag prevention device according to a first embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing the AA cross section shown in FIG. FIG. 3 is a detailed cross-sectional view of a contact portion between the guide surface of the operation member shown in FIG. 1 and the rotating member of the swing member.

<First Embodiment>
As shown in FIGS. 1, 2, and 3, the material end sag preventing device 30 according to the first embodiment cuts the material end W <b> 1 outside the material width of the plate steel plate W into a predetermined outer shape. When the plate steel plate W is attached to the apparatus 40 and moved in the material feeding direction (in the direction of arrow F), the support member 3 that supports the material edge W1 and the support member 3 when the plate steel plate W is cut. And a moving member 10 that moves to a non-supporting position (3B) that is separated from the material end W1.

The feeding device 40 includes an upper mold 4 and a lower mold 5. Upper cutting blades 41 and 42 are formed on the upper die 4, and a pad 6 and an elastic body 7 that urges the pad downward are mounted adjacent to the upper cutting blades 41 and 42. Also. Lower cutting blades 51 and 52 are formed on the lower die 5 so as to face the upper cutting blades 41 and 42.
When the upper cutting blades 41 and 42 and the lower cutting blades 51 and 52 are engaged with each other, the material end W1 outside the material width of the plate steel plate W is cut into an irregular shape. The material end W1 cut by the upper cutting blade 41 and the lower cutting blade 51 located on the front side in the material feeding direction (the direction of arrow F) hangs down after passing through the lower cutting blade 51, and the material feeding direction In order to prevent interference with the lower cutting blade 52 located on the rear side, the support member 3 supports the material end W1 from below.

  The support member 3 is formed such that a support plate 31 that supports the material end W1 by contacting the material end W1 from below and a regulation plate 32 that regulates the material end W1 from the side intersect the substantially L-shaped cross section. . The lengths of the support plate 31 and the regulation plate 32 in the material feed direction (the direction of arrow F) are located on the lower cutting blade 51 located on the front side in the material feed direction (the direction of arrow F) and on the rear side in the material feed direction. The length is sufficient to fit between the lower cutting blade 52.

The moving member 10 includes an operation member 1 fixed to the upper die 4 of the feed device 40 and a support shaft that holds the support member 3 and is fixed to the lower die 5 of the feed device 40 in conjunction with the operation member 1. And a swinging member 2 that swings in the material width direction (in the direction of arrow R) around 241.
The operation member 1 has a substantially rectangular shape, and a guide surface 11 formed in a curved shape is formed on the side wall 15 outside the mold. The guide surface 11 is a curved guide surface that moves the support member 3 moved inward of the mold to the outside of the mold. The guide surface 11 is formed such that the inclination angle θ formed by the tangent line K and the horizontal line V at the contact position J in contact with the swing member 2 gradually decreases as the operation member 1 is lowered. The side wall 14 on the inner side of the mold is formed on a vertical surface, and the front end portion 13 that intersects the fastening portion 12 to the upper mold 4 and the lower end of the guide surface 11 is formed on a horizontal plane. The intersection between the lower end of the guide surface 11 and the tip 13 is rounded or chamfered.

  The swing member 2 is a parallel link mechanism including a table base 21 that fixes the support member 3 and a pair of parallel link pieces 22 in the material feeding direction. One end 221 of each parallel link piece 22 is pivotally supported by a support pin 212 on a bearing portion 211 formed at the lower end of the table base 21. The other end 222 of each parallel link piece 22 is pivotally supported by two support shafts 241 fixed to the lower mold 5. Each support shaft 241 is formed on a substantially U-shaped link base 24 in parallel with the material feeding direction. A connecting plate 23 is rotatably connected to the other end 222 of the parallel link piece 22 below the support shaft 241 by a support pin 231. An elastic body 25 is fitted between the connecting plate 23 and the link base 24 so that when the operation member 1 is separated upward, the support member 3 returns to the support position (3A) that supports the material end W1. . The elastic body 25 is, for example, urethane rubber. The connecting plate 23 is formed with a stop portion 27 that comes into contact with the link base 24 when returned to the support position (3A). The parallel link piece 22 secures the movement amount of the support member 3 and at the same time reduces the deflection amount of the elastic body 25 so that the distance from the bearing portion 211 to the support shaft 241 is greater than the distance from the connecting plate 23 to the support shaft 241. Largely formed.

  A rotating body 213 that contacts the guide surface 11 of the operation member 1 is formed on the swing member 2 so as to be rotatable. The rotating body 213 is a cylindrical roller body and is pivotally supported on the bearing portion 211 by a support pin 212. The table base 21 is formed with an opening 214 that opens above the rotating body 213. When the operation member 1 is inserted into the opening 214 and the guide surface 11 and the rotating body 213 come into contact with each other, the rotating body 213 comes into rolling contact with each other, so that the impact force and the frictional resistance force are greatly reduced.

Second Embodiment
As shown in FIGS. 4, 5, and 6, the material end sag preventing device 30 </ b> B according to the second embodiment cuts the material end W <b> 1 outside the material width of the plate steel plate W into a predetermined outer shape. When the plate steel plate W is attached to the apparatus 40 and moved in the material feeding direction (in the direction of arrow F), the support member 3 that supports the material edge W1 and the support member 3 when the plate steel plate W is cut. And a moving member 10B that moves to a non-supporting position (3B) that is separated from the material end W1.
In the material sag prevention device 30B according to the second embodiment, the support member 3 and the operation member 1 are common, except that the structure of the swing member 2B of the moving member 10B is different from that of the first embodiment. Therefore, the common support member 3 and operation member 1 use the same reference numerals as those in the first embodiment, and the description thereof is omitted in principle.

The swing member 2B is a parallel link mechanism that includes a table base 21B that fixes the support member 3 and a pair of parallel link pieces 22 in the material feeding direction. One end 221 of each parallel link piece 22 is pivotally supported by a support pin 212 on a bearing portion 211 formed at the lower end of the table base 21B. The other end 222 of each parallel link piece 22 is pivotally supported by two support shafts 241 fixed to the lower mold 5. Each support shaft 241 is formed on a substantially U-shaped link base 24 in parallel with the material feeding direction. A connecting plate 23 is rotatably connected to the other end 222 of each parallel link piece 22 by a support pin 231 below the support shaft 241.
An elastic body 26 is mounted between the connecting plate 23 and the support shaft 241 so that when the operation member 1 is separated upward, the support member 3 returns to the support position (3A) that supports the material end W1. The elastic body 26 is, for example, a tension spring. The connecting plate 23 is formed with a stop portion 27 that comes into contact with the link base 24 when returned to the support position (3A). In the parallel link piece 22, the distance from the bearing portion 211 to the support shaft 241 is greater than the distance from the connection plate 23 to the support shaft 241 in order to secure the amount of movement of the support member 3 and to reduce the amount of bending of the elastic body 26. Largely formed.

A sliding contact surface 215 that comes into contact with the guide surface 11 of the operation member 1 is formed on the swing member 2B. The sliding surface 215 is an arcuate curved surface. The table base 21 </ b> B has an opening 214 </ b> B that opens the opposite side of the sliding contact surface 215. Since the operation member 1 is inserted into the opening 214B and makes a line contact when the guide surface 11 and the sliding contact surface 215 come into contact with each other, the impact force and the frictional resistance force are alleviated.
In the second embodiment, since the sliding contact surface 215 is formed instead of the rotating body 213 that contacts the guide surface 11 of the operation member 1, a simpler structure can be achieved.

<Operation method of material sag prevention device>
Next, the operation method of the material sag prevention devices 30 and 30B according to the first and second embodiments will be briefly described.
As shown in FIGS. 1 to 6, when the upper mold 4 is raised, the operation member 1 is separated from the swinging members 2, 2 </ b> B in the vertical direction (the direction of the arrow P). Therefore, the parallel link pieces 22 of the swing members 2 and 2B are tilted and rotated inward of the mold by the urging forces of the elastic bodies 25 and 26, and the table bases 21 and 21B are translated inward of the mold. The support member 3 fixed to the table bases 21 and 21B moves to the support position (3A) that supports the material end W1. With the support member 3 supporting the material end W1, the plate steel plate W is moved by a predetermined amount in the material feed direction via a material feed device (not shown). During the movement of the plate steel plate W, the support member 3 prevents the material end W1 from drooping and prevents the lower cutting blade 52 located on the rear side in the material feeding direction from interfering with the material end W1.

After the movement of the plate steel plate W is completed, the upper mold 4 is lowered. When the upper die 4 is lowered, the guide surface 11 of the operating member 1 comes into contact with the rotating member 213 or the sliding contact surface 215 of the swinging members 2 and 2B, and the support member 3 is moved to the non-supporting position (3B) outside the die. Move to. At this time, the parallel link pieces 22 of the swinging members 2 and 2B stand substantially vertically. Since the support member 3 moves to the non-support position (3B) outside the mold, the support plate 31 is separated from the material end W1. The support plate 31 is separated from the material end W1 and the material end W1 is cut. The cut material end W1 falls out of the mold as scrap. In addition, since the parallel link piece 22 stands up substantially vertically with an arc trajectory from the inclined state, the support plate 31 moves away from the material end W1 to the outside of the mold and simultaneously moves upward. To do. Therefore, the cut material end W <b> 1 can be dropped without being caught by the support plate 31.
As described above, in the material end sag prevention devices 30 and 30B, the support member 3 is connected to the support position (3A) and the non-support position (3B) of the material end W1 in synchronization with the movement of the upper mold 4 in the vertical direction. The material end W1 before cutting is suspended and the scrapping of the material end W1 after cutting is smoothly performed.

<Operational effects of this embodiment>
As described above in detail, according to the material sag prevention devices 30 and 30B according to the present embodiment, the moving members 10 and 10B include the operation member 1 fixed to the upper die 4 of the feeding device 40 and A swinging member 2 that holds the support member 3 and swings in the material width direction (in the direction of arrow R) around a support shaft 241 that is fixed to the lower mold 5 of the feeding device 40 in conjunction with the operation member 1; 2B, the operating member 1 swings the swinging members 2 and 2B in the material width direction in accordance with the rising and lowering of the upper mold 4 and moves the plate steel plate W in the material feeding direction (direction of arrow F). The support member 3 can be supported by the support member 3 when moved, and the support member 3 can be separated from the material end W1 when the plate-like steel plate W is cut. Therefore, before cutting the plate steel plate W, the material end sag prevention devices 30 and 30B having a simple structure that converts the linear motion of the operation member 1 into the rotational motion of the swing members 2 and 2B on which the support member 3 is held are provided. The support member 3 supports the material end W1 and prevents the material end W1 moving in the material feeding direction from falling down. When the plate steel plate W is cut, the support member 3 is cut away from the material end W1. The material end W1 can be smoothly discharged out of the mold.
Further, since the swing members 2 and 2B only swing in the material width direction around the support shaft 241 fixed to the lower mold 5, the swing members 2 and 2B are excellent in durability. Therefore, it is not necessary to increase the strength and size of the swing members 2 and 2B as in the conventional cam unit.
Therefore, it is possible to provide the material anti-sagging devices 30 and 30B that can ensure the durability even with a low-cost and simple structure while making the device compact.

Further, according to the present embodiment, the operation member 1 has the inclination angle θ formed by the tangent line K and the horizontal line V at the contact position J in contact with the swing members 2, 2 </ b> B gradually decrease as the operation member 1 is lowered. Since the guide surface 11 is formed, the oscillating members 2 and 2B can be smoothly rotated while the impact force of the operating member 1 on the oscillating members 2 and 2B is reduced. Further, since the guide surface 11 of the operation member 1 has an inclination angle θ formed by the tangent line K and the horizontal line V at the contact position J in contact with the swinging members 2 and 2B, gradually decreases as the operation member 1 is lowered. The moving speed at which 3 moves away from the material edge W1 can be initially slowed and then gradually increased. Therefore, the support member 3 can support the material end W1 until immediately before cutting the plate steel plate W while reducing the load acting between the operation member 1 and the swinging members 2 and 2B.
As a result, the material sag prevention devices 30 and 30B can be formed in a more compact and simple structure.

  According to the first embodiment, the oscillating member 2 is formed with the rotating member 213 in contact with the guide surface 11 of the operating member 1 so as to be rotatable. Wear at the contact position J that comes into contact can be further reduced. Therefore, the wear amount of the guide surface 11 of the operation member 1 and the wear amount of the rotating body 213 of the swing member 2 can be reduced, and the durability of the material end-sag prevention device 30 can be further improved.

  Further, according to this embodiment, the swing members 2, 2 </ b> B are fixed to the lower mold 5, with the table bases 21, 21 </ b> B fixing the support member 3, and one end 221 being pivotally supported by the table bases. Since the parallel link mechanism includes the pair of parallel link pieces 22 having the other end 222 pivotally supported by the support shaft 241, the support member 3 can swing while supporting the material end W1 in parallel. Therefore, the support member 3 can more reliably prevent the material end W1 from drooping by supporting the material end W1 in parallel.

  Further, according to the present embodiment, the swinging members 2 and 2B are provided with the elastic bodies 25 and 26 that return the support member 3 to the support position (3A) where the material end W1 is supported. If the swing members 2 and 2B are separated from the swing members 2 and 2B, the swing members 2 and 2B can be easily returned to the support position (3A) by the elastic bodies 25 and 26. Since the rocking members 2 and 2B can be returned to the support position (3A) by the elastic bodies 25 and 26, no special driving device is required. Therefore, the material edge sag prevention devices 30 and 30B can be formed in a more compact and simple structure.

The embodiment described above can be changed as appropriate without departing from the scope of the present invention.
For example, in the first embodiment and the second embodiment, the rocking members 2 and 2B are rocked using the pair of parallel link pieces 22, but are not necessarily limited to the parallel link pieces. For example, the parallel link piece may be changed to a leaf spring, and one end of the leaf spring may be fixed to the table base and the other end fixed to the lower mold. Since the leaf spring is elastically rocked in conjunction with the operation member, the elastic bodies 25 and 26 for returning the support member 3 to the support position (3A) where the material end W1 is supported can be omitted.

  The present invention is used, for example, in a feed-out device that cuts a plate-shaped steel sheet rewound from a coil material into a predetermined outer shape, and prevents the material end moving in the material feed direction from falling down in the feed-out device. It can be used as a material sag prevention device that avoids interference with the lower cutting blade (lower blade).

DESCRIPTION OF SYMBOLS 1 Operation member 2, 2B Oscillating member 3 Support member 3A Support position 3B Non-support position 4 Upper mold | type 5 Lower mold | type 6 Pad 10, 10B Moving member 11 Guide surface 21, 21B Table base 22 Parallel link piece 23 Connecting plate 23B Connecting rod 24 Link base 25, 26 Elastic body 30, 30B Material end drooping device 40 Feeding device 41, 42 Upper cutting blade 51, 52 Lower cutting blade 213 Rotating body 221 One end 222 Other end 241 Support shaft F Material feed direction J Contact position K Tangent line V Horizontal line W Sheet steel W1 Material edge θ Inclination angle

Claims (4)

A support member that supports the material end when the plate-shaped steel plate is moved in the material feeding direction, and is attached to a feeding device that cuts the material end outside the material width of the plate-shaped steel plate into a predetermined outer shape; A material end drooping device comprising a moving member that moves the support member to a non-supporting position spaced from the material end when cutting a plate steel plate,
The moving member includes an operation member fixed to the upper die of the feeding device and a support shaft that holds the support member and is fixed to the lower die of the feeding device in conjunction with the operation member. A rocking member that rocks in the material width direction ;
A material end anti-skid device, wherein the operating member is formed with a guide surface in which an inclination angle formed by a tangent line and a horizontal line at a contact position where the operating member is in contact with the swinging member gradually decreases as the operating member is lowered. . The material anti-sagging device according to claim 1 ,
The material sag stopper is characterized in that a rotating body that contacts the guide surface of the operation member is formed on the swing member so as to be rotatable. In the material anti-sagging device according to claim 1 or 2 ,
The swing member includes a table base for fixing the support member, and a pair of parallel link pieces, one end of which is pivotally supported by the table base and the other end of which is pivotally supported by a support shaft fixed to the lower mold. A material sag prevention device, characterized by being a parallel link mechanism comprising: The material anti-sagging device according to any one of claims 1 to 3 ,
The swinging member includes an elastic body for returning the support member to a support position where the support member supports the material end.

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