JP2007269451A - Sheet material restraint device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet material restraint device capable of restraining/positioning a sheet material at a predetermined position while suppressing large deformation damage of an edge end of the sheet material without applying specific machining to the sheet material. <P>SOLUTION: When an upper roller 4 is retreated along a retreating track M by rotation of a rocking arm 5, urging force and attenuation force for suppressing rotation of the rocking arm 5 and pushing/returning the upper roller 4 in an opposite direction to the retreating track M are given to the rocking arm 5 from an air pressure cylinder 6, and motion energy of a workpiece W for pushing/moving the upper roller 4 in the retreating track M direction is gradually absorbed and consumed. Further, when the workpiece W collides and a stopper member 7 is pushed/moved, collision force of the workpiece W is absorbed by magnetic repulsion force of a pair of shock absorbing magnets 9, 10 and the workpiece W is restrained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet material restraining device installed in a destack feeder or the like, and more particularly to a sheet material restraining device for restraining a sheet material that has slid along a transfer path at a predetermined position.

  According to the sheet material restraining device equipped in the conventional destack feeder, when the sheet material slides on the conveying surface and reaches the positioning stage, the edge surface on the front side in the traveling direction (transfer direction) of the sheet material is movable. The sheet material is stopped by the positioning stage by absorbing the collision energy between the stopper member and the sheet material by a buffer means such as a coil spring or rubber.

  On the other hand, in Patent Document 1 described below, there is a stopper device that stops (stops) a workpiece using a pneumatic shock absorber on a conveyance line that conveys a pallet or the like on which various parts are placed as the workpiece. Proposed. According to this stopper device, when the workpiece is conveyed on the conveying line and collides with the roller of the stopper member, the collision force (external force) is absorbed by the first rod via the stopper member and the first piston.

The collision energy of the workpiece is completely absorbed by the first piston until the first rod reaches the upper end, and at the same time, the latching pawl of the stopper member enters the latching hole of the workpiece due to the rising of the first rod. Backward movement is reliably prevented, and the work is reliably stopped at a predetermined position. At this time, since the first rod is biased upward by the first piston, the latching claw cooperates with the roller to reliably grip the workpiece.
JP 2003-156092 A

  However, in the sheet material restraining device in the conventional destack feeder described above, the sheet material conveyance speed (transfer speed) increases with the recent increase in production speed, and the collision energy between the sheet material and the stopper member increases. Therefore, the impact energy cannot be absorbed by the buffer means such as a coil spring or rubber, and the edge surface on the front side in the traveling direction of the sheet material colliding with the stopper member is bent and deformed greatly. The problem has arisen.

  If the edge end surface on the front side in the traveling direction of the sheet material is deformed and damaged as described above, the thickness of the sheet material is increased by the amount of the bending. Then, when the sheet material is slid into the press device in the next process of the destack feeder, it becomes difficult for the sheet material to be caught between the upper and lower molds and smoothly slid. Invite the problem of being invited.

  On the other hand, the stopper device described in Patent Document 1 can also be used as a sheet material restraining device for a destack feeder. However, in this stopper device, a seat is provided in advance with a retaining hole for retaining a retaining claw of the stopper member. Since it is necessary to make a hole in the material, it is necessary to newly provide a processing process for previously making a latching hole in the sheet material, which makes it difficult to effectively utilize existing equipment.

  The present invention has been made to solve the above-described problems, and suppresses large deformation damage at the edge portion of the sheet material without performing special processing on the sheet material, while the sheet material is placed at a predetermined position. An object of the present invention is to provide a sheet material restraining device that can be restrained and positioned.

  In order to achieve this object, the sheet material restraining device according to claim 1 is for restraining a sheet material that is slid and transferred from an upstream side to a downstream side of a transfer path at a predetermined position. A stopper member disposed on the downstream side of the transfer path to abut against the front edge of the sheet material in the transfer direction to stop the sheet material, and disposed on the upstream side of the transfer direction with respect to the stopper member. By urging at least one of the pair of guide members respectively brought into contact with the front and back surfaces of the front edge portion in the transfer direction of the sheet material to be transferred with respect to the sheet material, And a biasing means for pressing the pair of guide members against the front and back surfaces of the sheet material to depressurize the sheet material.

  According to the sheet material restraining device of the first aspect, when the sheet material slides in the forward direction of the transfer path from the upstream side to the downstream side of the transfer path, first, the front edge portion of the sheet material in the transfer direction A pair of guide members are brought into contact with the front and back surfaces, and either one of the guide members is urged against the sheet material by the urging means. Then, the pair of guide members are pressed against the front and back surfaces of the sheet material, respectively, and the kinetic energy of the sheet material is absorbed by the frictional resistance caused by the pressure contact. After that, when the front edge surface in the transport direction of the sheet material collides with the stopper member, the sheet material is stopped at a predetermined position.

  In the present application, the kinetic energy after the sheet material collides with the stopper member among the kinetic energy of the sheet material is also referred to as collision energy. Moreover, the force resulting from this collision energy is called a collision force.

  The sheet material restraining device according to claim 2 is the sheet material restraining device according to claim 1, wherein the pair of guide members roll in contact with the front and back surfaces of the sheet material transferred from the upstream side of the transfer path. A pair of rollers.

  According to the sheet material restraining device of the second aspect, in addition to exhibiting the same operation and effect as the sheet material restraining device according to the first aspect, the pair of rollers serving as the pair of guide members includes the sheet material. When the sheet material is pressed against the front and back surfaces of the sheet material, the sheet material is rolled along with the transfer of the sheet material.

  The sheet material restraining device according to claim 3 is for restraining a sheet material slid and transported from the upstream side to the downstream side of the transfer path at a predetermined position, and the outer peripheral upper end surface is the transfer path. A lower roller that is substantially flush with the upper surface and is axially oriented in the same direction as the width direction of the transfer path, and a lower roller that is allowed to roll around a rotation axis, and circumscribed on the outer peripheral upper portion of the lower roller Or an upper roller that is disposed opposite to and is rotatable about a rotation axis that is oriented in the same direction as the width direction of the transfer path, and the upper roller is connected to the lower roller. Roller that guides to move along a retreating path that rises in an arc from the closest starting point position to the upper downstream side of the transfer path, passes through the apex position, and descends in an arc shape to the lower lower side of the transfer path The guide member and its roller guide member. A biasing means that applies a biasing force and a damping force acting in a direction opposite to the guiding direction of the upper roller to the upper roller to depressurize, and the upper roller that is biased by the biasing means includes: A stopper member that abuts the front edge of the sheet material in the transfer direction when it reaches the vicinity of the apex position of the retreating track, and a slide member that mounts the stopper member so as to be able to reciprocate in the sheet material transfer direction and the counter-transfer direction. And a buffer means for buffering a collision force acting on the slide member toward the downstream side of the transfer path.

  According to the sheet material restraining device of the third aspect, the sheet material slides in the forward direction of the transfer path (see the arrow x direction in FIG. 1) from the upstream side to the downstream side of the transfer path. When the front edge in the transfer direction collides with and collides with the upper roller, the collision force of the sheet material pushes the upper roller back so as to retreat along the retreat track, and the front portion of the sheet material in the transfer direction Changes to a pressing force that pushes down below the upper roller.

  Since the sheet material moves in the forward direction of the transfer path even after the collision with the upper roller, the upper roller and the lower roller, which are in contact with and in contact with the outer peripheral surface of the sheet material, are rolled around the rotation axis. The Further, the pressing force that pushes down the front portion of the sheet material in the lower direction of the upper roller causes the edge of the sheet material to bend into the lower side of the upper roller so that the edge of the sheet material bends. As a result, the sheet material enters between the upper roller and the lower roller.

  At this time, since the urging force and the damping force by the depressing means are acting on the upper roller, the upper roller is pressed against the upper surface (surface) of the sheet material, while the lower roller is brought into contact with the sheet material by the reaction caused by the pressure contact. Is pressed against the lower surface (back surface). As a result, a frictional resistance is generated between the sheet material and the upper and lower rollers, so that the kinetic energy of the sheet material can be absorbed by this frictional resistance and the sheet material can be de-energized.

  On the other hand, after the collision between the upper roller and the sheet material, the upper roller is pushed by the sheet material and guided along the retracted track by the roller guide member, so that the upper roller approaches from the starting point position closest to the lower roller. Then, it is raised and retracted in an arc shape toward the upstream side of the transfer path, reaches the apex position, and is moved so as to descend and recede in an arc shape from the apex position further downward on the downstream side of the transfer path.

  In addition, an urging force and a damping force opposite to the guiding direction by the roller guiding member are applied to the upper roller guided and moved in this way by the depressing means. For this reason, the sheet material that collides with the upper roller pushes the upper roller while resisting the biasing force and damping force of the depressing means and proceeds downstream in the transfer direction. The kinetic energy of the material is gradually consumed, and the sheet material is de-energized (decelerated).

  In this way, when the kinetic energy of the sheet material is consumed by the reducing means and the upper roller comes to the vicinity of the apex position of the retreating track, the front edge surface of the sheet material in the transfer direction collides with the stopper member and collides with it. The When the sheet material collides with the stopper member, the stopper member is pushed from the sheet material by the collision, and the slide member is moved toward the downstream side of the transfer path with the momentum. The impact force of the sheet material is buffered by the buffer means.

  As a result, the kinetic energy of the sheet material is further consumed, the reduction of the sheet material is promoted, and the sheet material is finally stopped.

  5. The sheet material restraining device according to claim 4, wherein in the sheet material restraining device according to claim 3, the roller guide member is pivotally mounted on a tip portion so that the upper roller can roll via a rotation shaft. An oscillating shaft provided at a base end portion of the oscillating arm and oscillatingly supporting the oscillating arm, and by the rotation of the oscillating arm about the oscillating axis, The upper roller is moved back in an arc along the retreating track.

  According to the sheet material restraining device according to claim 4, in addition to exhibiting the same operation and effect as the sheet material restraining device according to claim 3, when the front side edge surface of the sheet material collides with the upper roller, The upper roller is pushed by the sheet material, and the swing arm is rotated in one direction around the swing shaft. Then, the upper roller is moved back in an arc along the retreat trajectory.

  The sheet material restraining device according to claim 5 is the sheet material restraining device according to claim 4, wherein the depressing means is located at a position away from the center of the swing shaft supporting the swing arm by a predetermined radius. It is a pneumatic cylinder to which the parts are connected.

  According to the sheet material restraining device of the fifth aspect, in addition to the effects and effects similar to those of the sheet material restraining device according to the fourth aspect, since the damping means is a pneumatic cylinder, the air pressure supplied thereto is reduced. By adjusting, the urging force and the damping force opposed to the moving force of the sheet material acting on the upper roller can be adjusted.

  Also, for example, after the sheet material is stopped and positioned, the sheet material is fed into a subsequent press device by a transport mechanism such as a loader. In such a case, the upper roller presses the upper surface of the sheet material. Therefore, it becomes difficult to pick up the sheet material by the transport mechanism. Therefore, in such a case, the compressed air supply port of the pneumatic cylinder can be switched by a solenoid valve so that the cylinder rod can be immersed in the cylinder body and the upper roller can be retracted from the sheet material. .

  The sheet material restraining device according to claim 6 is the sheet material restraining device according to any one of claims 3 to 5, wherein the stopper member adjusts the position of the stopper member in the sheet material transfer direction or the counter-transfer direction. Means.

  According to the sheet material restraining device according to claim 6, in addition to the same operation and effect as the sheet material restraining device according to any one of claims 3 to 5, the stopper member is adjusted by the stopper position adjusting means. The position at which the stopper member first abuts with the sheet material can be changed by adjusting the position in the sheet material transfer direction or the counter-transfer direction.

  For example, when the collision force between the stopper member and the sheet material is excessive, if the stopper member is moved backward from the current position to the downstream side in the sheet material transfer direction via the stopper position adjusting means, the upper roller and the depressurizing means The depressurization time can be set longer than the present time, and the sheet material can be made to collide with the stopper member after sufficient depressurization of the sheet material.

  The sheet material restraining device according to claim 7 is the sheet material restraining device according to any one of claims 3 to 6, wherein the buffer means includes a pair of magnets, and one of the magnets together with the stopper member. The other magnet mounted on the slide member is disposed on the downstream side of the transfer path so as to face the one magnet, and the pair of magnets have the same type of magnetic poles facing each other. Has been.

  According to the sheet material restraining device according to claim 7, in addition to the same operation and effect as the sheet material restraining device according to any one of claims 3 to 6, the buffer means is provided between the pair of magnets. Because it uses the repulsive force due to magnetic repulsion, it can function like a spring mechanism, even though it is a non-contact type buffering mechanism, and can secure a buffering characteristic equivalent to an air cushion even in a small space. it can. Therefore, the collision energy of the sheet material that could not be absorbed by the buffer mechanism such as a coil spring or rubber can be buffered, and the front edge of the sheet material that collided with the stopper member is greatly bent and deformed and damaged. Can be prevented.

  The sheet material restraining device according to an eighth aspect of the present invention is the sheet material restraining device according to the seventh aspect, wherein the buffer means includes a magnetic force adjusting means for adjusting a distance between opposing surfaces of the pair of magnets.

  According to the sheet material restraining device according to claim 8, in addition to the same operation and effect as the sheet material restraining device according to claim 7, the distance between the opposing surfaces of the pair of magnets is adjusted by the magnetic force adjusting means. By doing so, the magnitude of the magnetic repulsive force acting between the pair of magnets at the time of collision between the sheet material and the stopper member can be adjusted.

  The sheet material restraining device according to claim 9 is the sheet material restraining device according to any one of claims 3 to 8, wherein the sheet material in contact with the outer peripheral surface of the upper roller moves in the forward direction of the transfer path. A one-way clutch that prohibits rolling of the upper roller when the upper roller rolls around the rotation axis and the sheet material in contact with the outer peripheral surface of the upper roller tries to return in the reverse direction of the transfer path. .

  According to the sheet material restraining apparatus of the ninth aspect, in addition to the same operation and effect as the sheet material restraining apparatus according to any one of the third to eighth aspects, the sheet material is reversely transferred by the buffer means. When the sheet is pushed back in the direction, rolling of the upper roller that is in contact with the surface of the sheet material is prohibited by the one-way clutch. Therefore, a frictional force that prevents the sheet material from being pushed back is generated between the upper roller and the sheet material. It can be generated, and the pushing force of the sheet material by the buffer means can be consumed by the friction force.

  For example, in the case of the buffering means according to claim 7, the magnetic repulsive force accumulated in the buffering means by the buffering of the sheet material is released as a force that pushes back the sheet material received by the stopper member in the reverse direction of the transfer path. However, at this time, if the one-way clutch prohibits the rolling of the upper roller that is in contact with the surface of the sheet material and generates a frictional force that prevents the sheet material from being pushed back, the magnetic repulsive force of the buffer means is reduced to the frictional force. It is possible to suppress the sheet material from being pushed back by being converted into the consumption.

  Note that the surface of the sheet material at this time may be slightly scratched by the upper roller, but the front edge in the transfer direction of the sheet material with which the upper roller is in contact is provided with a press device or the like at the rear stage. Since it is also a part cut from the sheet material in the trimming process used, even if the surface of this part is slightly scratched, the quality of the final product manufactured using the sheet material does not deteriorate.

  According to the present invention, the pair of guide members according to claim 1 or the upper roller and the lower roller according to claim 3 (hereinafter referred to as “guide member etc.” in this section) are arranged in front of the sheet material in the transfer direction. By making pressure contact with the front and back surfaces of the edge portion, a frictional resistance is obtained between them and the sheet material, thereby absorbing the kinetic energy of the sheet material. Therefore, compared with a case where the front edge surface of the sheet material in the transfer direction is caused to collide with the stopper member and receive it, a high surface pressure is not applied to the front edge surface of the sheet material in the transfer direction. Even if the front edge of the direction edge collides with the stopper member, it can be prevented from being deformed.

  In addition, when the sheet material is stopped only by causing a frontal collision with the stopper member, it is not possible to avoid deformation of the front edge of the sheet material in the transfer direction unless the stopper member absorbs the collision energy of the sheet material extremely softly. It has also been extremely difficult to technically realize it. However, according to the present invention, the kinetic energy is absorbed by using a portion (front and back surfaces of the sheet material) different from the edge surface of the sheet material before the front edge surface of the sheet material in the transfer direction collides with the stopper member. Therefore, the sheet material can be softly collided with the stopper member.

  In addition, when the sheet material collides with the stopper member, the front edge portion of the sheet material in the transfer direction is sandwiched from above and below by the guide member or the like, and this pinching is the front edge portion of the sheet material in the transfer direction. It functions as a reinforcement that prevents the deformation of the material. For this reason, even if the collision energy with the stopper member concentrates on the front edge of the sheet material in the transfer direction and the front edge of the sheet material in the transfer direction is deformed, the sheet material is transferred by reinforcing the guide member. The deformation of the edge portion in the direction is prevented. In other words, the guide member or the like not only absorbs the kinetic energy of the sheet material via the frictional resistance but also protects the sheet material from deformation due to collision with the stopper member.

  By the way, when the form of the sheet material is observed macroscopically, when the thickness of the sheet material is extremely small compared to the length and width, that is, when the sheet material is a thin plate, Rather than being referred to as a “surface”, the shape is like a “line” extending linearly in the width direction of the sheet material. For this reason, in the conventional system in which the front member collides with the stopper member and absorbs the collision energy of the sheet material, the collision force accompanying the frontal collision cannot be received by the front edge surface in the sheet material transfer direction. It was under the situation where the front edge of the direction was bent (or buckled).

  On the other hand, in the present invention, when absorbing the kinetic energy of the sheet material, the guide member or the like is brought into frictional contact with the “surface” called the front and back surfaces of the front edge of the sheet material in the transfer direction. Since the collision energy is not absorbed at the front edge of the material in the transfer direction, the kinetic energy of the sheet can be absorbed without bending (or buckling) the front edge of the sheet in the transfer direction. It is.

  In addition, as in the conventional case, when the collision energy of the sheet material is absorbed simply by causing the sheet material to collide with the stopper member, the impact received by the stopper member is usually buffered by an impact absorbing means such as a shock absorber. In order for such an impact absorbing means to function, the sheet material inevitably had to collide with the stopper member.

  Here, since the system dynamic characteristics of the stopper member and the impact absorbing means are approximately a second order lag system or an approximation thereof, the output (impact absorbing means buffering operation) delay with respect to the input (the impact force of the sheet material) is naturally delayed. Will occur. That is, since the energy absorption efficiency (conversion efficiency) of the collision energy stagnate during this delay period, the energy that cannot be absorbed by the impact absorbing means becomes the force that damages and deforms the sheet material.

  However, according to the present invention, since the guide member and the like are directly brought into contact with the front and back surfaces of the sheet material, the kinetic energy of the sheet material is directly converted into friction energy and absorbed. Thus, the kinetic energy absorption efficiency can be improved, and the damage deformation of the sheet material can be further suppressed.

  In particular, according to the invention described in claim 3, before the sheet material collides with the stopper member, the kinetic energy of the sheet material is increased by the depressing means through abutment with the upper roller and pushing it. Since it can be consumed, it is possible to prevent the front edge surface of the sheet material in the transfer direction from being greatly bent and deformed and damaged when it collides with the stopper member.

  Further, the upper roller that collided with the sheet material is guided by the roller guide member and depresses the sheet material by the depressing means while retreating to the downstream side in the transfer direction, and its outer peripheral surface comes into surface contact with the upper surface of the sheet material. Therefore, it is possible to further reduce damage caused by bending of the edge of the sheet material. Further, when the sheet material is restrained, it is not necessary to hold the latching claw in addition to the stopper member to the latching hole of the sheet material, so that it is not necessary to previously make the latching hole in the sheet material.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a right side view of a destack feeder 50 equipped with a work restraining device 1 which is an embodiment of a sheet material restraining device of the present invention. In addition, the arrow X in a figure has shown the transfer direction of the workpiece | work W. FIG.

  As shown in FIG. 1, the destack feeder 50 includes a workpiece transfer path 51 for placing and transferring workpieces W, which are a kind of metal sheet material, one by one, and an upstream side of the workpiece transfer path 51 ( A workpiece restraining device 1 is provided for restraining a sliding workpiece W at a predetermined position from the left side of FIG. 1 toward the downstream side (right side of FIG. 1).

  FIG. 2 is a right side view of the work restraining device 1 in which FIG. 1 is partially enlarged. As shown in FIG. 2, the workpiece transfer path 51 is configured by a conveyor that extends in the transfer direction of the workpiece W (in the direction of arrow X in the figure, hereinafter also referred to as “work transfer direction”). A plurality of conveying rollers 53 supported by the frame 52 so as to be idled are arranged in parallel in the workpiece transfer direction.

  According to this workpiece transfer path 51, the workpiece W sent from the upstream side (the left side in FIG. 2) of the workpiece W is rolled on the conveyor frame 52 by rolling the plurality of conveying rollers 53 that are in contact with the lower surface of the workpiece W. Can be slid (slided) from the upstream side (left side in FIG. 2) toward the downstream side (right side in FIG. 2).

  The work restraining device 1 is disposed and installed on the downstream end side (right side in FIG. 2) of the work transfer path 51. The work restraining device 1 mainly includes a base frame 2, a lower roller 3, an upper roller 4, and a swing arm 5. , A pneumatic cylinder 6, a stopper member 7, a linear guide 8, and a pair of buffer magnets 9 and 10.

  The lower roller 3 is formed in a circular shape when viewed from the side, and the outer peripheral upper end surface thereof is substantially flush with the upper surface of the workpiece transfer path 51 (the outer peripheral upper end surface of the conveying roller 53). The lower roller 3 is a rotating body that has a rotating shaft 11 passed through a central portion thereof and is rolled about the rotating shaft 11. The rotating shaft 11 supports the lower roller 3 on the upper end portion of the base frame 2 so as to be able to roll, and its axis is directed in the width direction of the work transfer path 51 (perpendicular to the paper surface of FIG. 2). ing.

  The upper roller 4 is formed in a circular shape in a side view with an outer diameter slightly smaller than that of the lower roller 3, and is disposed on the downstream end side of the workpiece transfer path 51 so as to face the upper side of the lower roller 3. Has been. The upper roller 4 is a rotating body that has a rotating shaft 12 passed through a central portion thereof and is rolled around the rotating shaft 12. The rotary shaft 12 supports the upper roller 4 so as to be able to roll on the tip end (upper end) of the swing arm 5 to be described later, and its axis is the width of the work transfer path 51 like the lower roller 3. It is directed in the direction.

  Further, as described above, the lower roller 3 and the upper roller 4 are arranged side by side in the vertical direction, but these are either in contact with each other on the outer peripheral surfaces or between the outer peripheral surfaces with a gap less than the thickness of the workpiece W. It is arranged in a state with a gap. Specifically, in this embodiment, a gap of less than about 1 mm is provided between the outer peripheral surfaces of the lower roller 3 and the upper roller 4 in the vertical direction. Further, the outer peripheral surface of the upper roller 4 is subjected to wear resistance treatment such as hard chrome plating or stainless steel (SUS304 or the like) vacuum nitriding treatment in order to reduce scratches due to frictional contact with the workpiece W.

  The swing arm 5 is formed in a substantially F-shape when viewed from the side, and the upper roller 4 is pivotally attached to the tip portion (the left end side of the horizontal portion of the U-shape) via a rotary shaft 12 so as to roll. ing. On the other hand, a swing shaft 13 is passed through the base end portion (lower end of the U-shaped inclined portion) of the swing arm 5, and the swing arm 5 is centered on the swing shaft 13. It is a rocking body supported so that rocking is possible. Further, the center of the swing shaft 13 of the swing arm 5 is below the center of the rotating shaft 12 of the upper roller 4 and further downstream of the center of the rotating shaft 12 of the upper roller 4 in the workpiece transfer direction ( A certain amount is shifted to the right side of FIG.

  In the swing arm 5 configured in this way, the workpiece W moves toward the downstream side (right side in FIG. 2) of the workpiece transfer path 51, and the edge surface and the upper side on the front side (right side in FIG. 2) of the workpiece W transfer direction. When the roller 4 collides with the roller 4, the movement of the upper roller 4 is guided and restricted. Specifically, the upper roller 4 pushed by the momentum of the work W moves the retraction track M (one point in FIG. 2). This is guided so as to retreat toward the downstream side (right side in FIG. 2) of the workpiece transfer path 51 by following the chain line arrow.

  The retreat trajectory M is a trajectory followed by the upper roller 4 when the swing arm 5 swings (rotates) around the swing shaft 13 toward the downstream side of the workpiece transfer path 51 (clockwise direction in FIG. 2). is there. The upper roller 4 moving on the retreating track M is moved from the starting point position closest to the lower roller 3 (refer to point P in FIG. 2) to the upper side on the downstream side of the workpiece transfer path 51 (upwardly diagonally to the right in FIG. 2). Ascending and retreating in an arcuate shape, it reaches the apex position (position just above the center of the swinging shaft 13; see point Q in FIG. 2), and further down the downstream side of the work transfer path 51 (FIG. 2). (Back diagonally to the right) and descends in a circular arc.

  The tip of the cylinder rod 14 of the pneumatic cylinder 6 is rotatably connected to the swing arm 5 via a connecting pin 16 at a position away from the center of the swing shaft 13 by a predetermined radius.

  The pneumatic cylinder 6 acts in the direction opposite to the moving direction of the upper roller 4 (in the direction of arrow M in FIG. 2) when the upper roller 4 is guided by the swing arm 5 and moves along the retreat track M. By applying an urging force and a damping force to the upper roller 4 through the swing arm 5, the urging force and the damping force are reducing means for reducing the work W colliding with the upper roller 4. The pneumatic cylinder 6 is pivotally supported so that the base end portion of the cylinder body 15 can swing with respect to the bracket 18 via a swing pin 17.

  The pneumatic cylinder 6 is a direct acting pneumatic fluid actuator that linearly protrudes and retracts the cylinder rod 14 from the tip of the cylinder body 15 using compressed air supplied to the cylinder body 15 as a working fluid. The pneumatic cylinder 6 is connected to the bracket 18 with the axial center of the cylinder body 15 directed in the vertical direction so that the cylinder rod 14 protrudes and protrudes in a substantially vertical direction.

  The stopper member 7 collides with the edge surface on the front side (right side in FIG. 2) of the workpiece W in the transfer direction when the upper roller 4 moves up and down to the vicinity of the apex position (see point Q in FIG. 2) of the retracting track M. A front surface portion 7 a that is a member that receives the workpiece W and abuts with an edge surface on the front side in the transfer direction of the workpiece W is provided facing the upstream side (left side in FIG. 2) of the workpiece transfer path 51.

  Specifically, the front end surface of the front portion 7a of the stopper member 7 is slightly in the workpiece transfer direction from the outer peripheral rear ends of the lower roller 3 and the upper roller 4 when the upper roller 4 is at the starting position of the retreat track M. It is shifted to the downstream side (right side in FIG. 2). The front end surface of the front portion 7a of the stopper member 7 will be described later so as to abut against the workpiece W when the upper roller 4 is slightly lowered and retracted from the apex position of the retreating track M (see the Q point in FIG. 2). The adjustment bolt 26 is adjusted (see FIG. 6B).

  FIG. 3 is a plan view of the workpiece restraint device 1. As shown in FIG. 3, the stopper member 7 is formed in a thick plate shape, and the front surface portion 7 a of the stopper member 7 is a convex surface protruding in a substantially arc shape that is asymmetrical when viewed in plan. Is formed. Further, a proximity switch 19 is disposed in front of the front surface portion 7a of the stopper member 7, and this proximity switch 19 abuts on the front surface portion 7a of the stopper member 7 and stops at a predetermined position. The presence or absence is detected.

  FIG. 4 is a left side view of the work restraining device 1. As shown in FIG. 4, the stopper member 7 is integrally mounted on the slide unit 21 of the linear guide 8 in a substantially vertical state, and the front surface portion 7a is on the upstream side of the workpiece transfer path 51 (right side in FIG. 4). They are facing each other. The linear guide 8 has a track rail 20 laid in the same direction as the workpiece transfer direction (arrow X direction in FIG. 4), and a slide unit 21 slidably engaged in the laying direction of the track rail 20. And.

  The linear guide 8 is configured such that the slide unit 21 is linearly reciprocated along the track rail 20. The slide unit 21 is integrated with the stopper member 7, and when the workpiece W collides with the stopper member 7, along the track rail 20 along with the stopper member 7, the downstream side in the workpiece transfer direction (left side in FIG. 4). Is pushed to.

  Further, the linear guide 8 has a stopper support 22 for mounting the stopper member 7 mounted on one end (the end corresponding to the upstream side in the workpiece transfer direction (right side in FIG. 4)) on the slide unit 21. Yes. A magnet support 23 for mounting a buffer magnet 9 made of a permanent magnet is mounted on the other end of the slide unit 21 (the end corresponding to the downstream side in the workpiece transfer direction (left side in FIG. 4)). ing.

  A constant interval is provided in the horizontal direction between the stopper support 22 and the magnet support 23, and the buffer magnet 9 is attached to the non-opposing surface side of the magnet support 23 with the stopper member 7. It is a plate-shaped permanent magnet. That is, the buffer magnet 9 is attached to the magnet support 23 in a state of being directed to the downstream side in the workpiece transfer direction (left side in FIG. 4).

  In addition, a thick plate-like plate 24 to which another buffer magnet 10 is attached at a predetermined distance from the buffer magnet 9 is disposed at the tip of the buffer magnet 9. The plate 24 that supports the buffer magnet 10 is disposed at one end of the linear guide 8 in the laying direction of the track rail 20 (the end corresponding to the downstream side in the workpiece transfer direction (left side in FIG. 4)). A portion (lower end) is attached to the rear end surface of the base frame 2.

  Here, the opposing surfaces of the pair of buffer magnets 9 and 10 are the same kind of magnetic poles, and when one buffer magnet 9 mounted on the slide unit 21 approaches the other buffer magnet 10, both The magnetic repulsive force (magnetic force) that is inversely proportional to the square of the distance is generated to function as a buffer means for absorbing the collision force exerted by the workpiece W on the stopper member 7.

  Further, the plate 24 to which the buffer magnet 10 is attached is provided with a protective stopper 25 protruding from the end surface of the buffer magnet 10 to the lower surface of the buffer magnet 10 on the mounting surface of the buffer magnet 10. Is attached. The protective stopper 25 is formed of a cushioning material such as high damping rubber, for example.

  The protective stopper 25 protrudes from the end surface of the slide unit 21 (the end surface corresponding to the downstream side in the workpiece transfer direction (left side in FIG. 4)), and the protective stopper 25 and the slide unit 21 abut each other. In some cases, a certain gap is secured between the pair of buffer magnets 9 and 10.

  Therefore, when the collision energy of the workpiece W exceeds the maximum repulsive force generated between the pair of buffer magnets 9, 10, the protective stopper 25 abuts against the end surface of the slide unit 21, so that the pair of buffer magnets 9, The collision between 10 can be prevented beforehand.

  In addition, the buffer magnet 10 has a sheet 10 a made of a buffer material such as high damping rubber attached to the surface facing the buffer magnet 9. For this reason, even if the buffer magnets 9 and 10 collide with each other, the collision is absorbed and attenuated by the buffer material sheet 10a. Further, the buffer magnets 9 and 10 are covered with a cover (not shown).

  In addition, a thick plate-like plate 27 having an adjustment bolt 26 penetrated and screwed to the other end portion in the laying direction of the track rail 20 (the end portion corresponding to the upstream side in the workpiece transfer direction (right side in FIG. 4)). Another plate is disposed, and the base end (lower end) of the plate 27 is attached to the front end face of the base frame 2. Here, the adjusting bolt 26 is also used as an adjusting means for the initial magnetic force of the buffer magnets 9 and 10 and an adjusting means for the initial position of the stopper member 7.

  The adjusting bolt 26 is a bolt whose shaft portion is screwed into the plate 27, and whose tip end protrudes from the plate 27 and is in contact with the end surface of the slide unit 21. By changing, the protrusion length of a shaft part is increased / decreased and the distance between a pair of buffer magnets 9 and 10 is adjusted. That is, by adjusting the distance between the buffer magnets 9 and 10 by the adjusting bolt 26, the magnitude of the initial repulsive force (magnetic repulsive force) when the work W abuts against the stopper member 7 is adjusted.

  Moreover, the adjustment bolt 26 can adjust the position of the slide unit 21 on the track rail 20 by changing the screwing amount. As a result, the initial position of the stopper member 7 (when the workpiece W is not colliding) can be adjusted. Can also be adjusted in the workpiece transfer direction or counter-transfer direction (arrow X direction or counter-arrow X direction in FIG. 4).

  For example, when the collision force between the stopper member 7 and the workpiece W is excessively large and the workpiece W is bent, the screwing amount of the adjusting bolt 26 is increased so that the stopper member 7 is moved in the workpiece transfer direction from the current position. By moving backward (in the direction of arrow X in FIG. 4), the depressurization time through the upper roller 4, the swing arm 5 and the pneumatic cylinder 6 can be made longer than the current state, and the work W is sufficiently deenergized. It can come to collide with the front part 7a of the stopper member 7.

  FIG. 5 is a longitudinal sectional view taken along line VV in FIG. 5 corresponds to the width direction of the work transfer path 51.

  As shown in FIG. 5, the lower roller 3, the upper roller 4, and the stopper member 7 are juxtaposed in the width direction of the work transfer path 51, and the stopper member 7 is formed in a substantially square shape when viewed from the front. . Further, the proximity switch 19 disposed in front of the front surface portion 7 a of the stopper member 7 is installed such that the upper end surface, which is the detection portion, is positioned lower than the outer peripheral upper end surface of the lower roller 3. The contact with the workpiece W moving on the lower roller 3 is prevented.

  The lower roller 3 is formed in a hollow cylindrical shape, and a rotary shaft 11 is inserted in the inner peripheral portion of the lower roller 3 so as to be idled. 2 is fixed. On the other hand, the upper roller 4 is formed in a hollow cylindrical shape having a width substantially equal to that of the lower roller 3, and an outer ring (not shown) of the one-way clutch 28 is inscribed inside the inner peripheral portion thereof. An inner ring (not shown) of the one-way clutch 28 is fitted on the outer periphery of the rotary shaft 12 of the upper roller 4, and both axial ends of the rotary shaft 12 are fixed to the tip of the swing arm 5. ing.

  The one-way clutch 28 is configured to roll the upper roller 4 around the rotary shaft 12 when the workpiece W that is in contact with the outer peripheral surface of the upper roller 4 moves in the transfer direction (the arrow X direction in FIG. 2). Further, the one-way clutch 28 prohibits the rolling of the upper roller 4 when the workpiece W in contact with the outer peripheral surface of the upper roller 4 tries to return in the direction opposite to the transfer direction (counter arrow X direction in FIG. 2). To do. The one-way clutch 28 used in this embodiment is a roller (roller) type in which a cam surface is formed on the inner peripheral surface of the outer ring.

  According to this one-way clutch 28, when the upper roller 4 rotates in the normal rotation direction (counterclockwise direction in FIG. 2) with respect to the rotation shaft 12, the roller (not shown) engages with the cam surface of the outer ring. The outer ring rotates forward relative to the inner ring away from the position, the upper roller 4 is idled about the rotation shaft 12, and the upper roller 4 is rolled relative to the workpiece W.

  On the other hand, according to the one-way clutch 28, when the upper roller 4 rotates in the reverse rotation direction (clockwise direction in FIG. 2) about the rotation shaft 12, the outer ring rotates in the reverse direction relative to the inner ring. Due to the spring action of the spring, the roller advances to the meshing position of the cam surface of the outer ring, and rolling of the upper roller 4 is prohibited by the wedge action between the cam surface of the outer ring and the inner ring.

  Further, the base end portion (lower end portion) of the swing arm 5 is formed in a hollow cylindrical shape, and outer rings (not shown) of bearings 29 and 29 are inscribed inside the inner peripheral portion. An inner ring (not shown) of the bearing 29 is fitted on the outer periphery of the swing shaft 13, and both axial ends of the rotary shaft 13 are fixed to the base frame 2.

  Next, with reference to FIG. 6, operation | movement of the workpiece | work control apparatus 1 comprised as mentioned above is demonstrated. FIG. 6 is a right side view of the workpiece restraint device 1 during the operation of the workpiece restraint device 1. First, the workpiece W slides in the forward direction from the upstream side to the downstream side of the workpiece transfer path 51 while rolling the plurality of conveying rollers 53 in the workpiece transfer path 51. 6A, when the edge surface on the front side (right side in FIG. 6) of the workpiece W in the transfer direction collides with the upper roller 4, the upper roller 4 is pushed by the workpiece W, and the swing arm 5 is rotated about the swing shaft 13 toward the downstream side in the workpiece transfer direction (clockwise direction in FIG. 2).

  By the rotation of the swing arm 5, the upper roller 4 is raised and retracted in an arc shape from the starting point position closest to the lower roller 3 along the retreat path M, while the cylinder rod 14 of the pneumatic cylinder 6 is swung. The rotation of the moving arm 5 causes the cylinder body 15 to be immersed. Then, an urging force and a damping force are applied from the pneumatic cylinder 6 to the oscillating arm 5 to prevent the oscillating arm 5 from rotating and push the upper roller 4 in the direction opposite to the retreating trajectory M. The kinetic energy of the workpiece W that tries to push 4 in the direction of the retreat trajectory M is gradually consumed (absorbed).

  On the other hand, to the workpiece W colliding with the upper roller 4, a pressing force is applied from the upper roller 4 to push down the front portion in the transfer direction (right side in FIG. 6). For this reason, after colliding with the upper roller 4, the front portion of the workpiece W in the transfer direction passes through the lower roller 3 while rolling and is bent so as to enter under the upper roller 4. (See FIG. 6B and FIG. 6C). When the front portion of the workpiece W in the transfer direction enters the lower side of the upper roller 4, the upper roller 4 rides on the upper surface of the workpiece W, and when the workpiece W further moves thereafter, the upper roller 4 moves to the rotating shaft. 12 is rolled on the workpiece W while being in surface contact with the upper surface of the workpiece W.

  At this time, since the urging force and damping force by the pneumatic cylinder 6 are acting on the upper roller 4, the upper roller 4 is pressed against the upper surface (surface) of the work W, and on the other hand, the lower roller 3 is caused by a reaction caused by this pressure contact. Is pressed against the lower surface (back surface) of the workpiece W. As a result, a frictional resistance is generated between the workpiece W and the upper roller 4 and the lower roller 3, and this frictional resistance absorbs the kinetic energy of the workpiece W and exerts a depressing action on the workpiece W. It becomes.

  When the upper roller 4 pushed by the workpiece W is further retracted beyond the apex position of the retreat trajectory M and starts to descend during the above-described operation, as shown in FIG. The edge surface of FIG. 6 (b) right side also collides with the stopper member 7 and collides. When the workpiece W collides with the stopper member 7, the stopper member 7 is pushed from the workpiece W, and the slide unit 21 moves downstream along the track rail 20 in the workpiece transfer direction (left side in FIG. 4). Moved towards.

  When the slide unit 21 moves, the distance between the opposing surfaces of the pair of buffer magnets 9 and 10 is reduced, and the magnetic repulsive force between the buffer magnets 9 and 10 is increased to act on the stopper member 7. The collision force of W is absorbed. Finally, a part of the kinetic energy of the workpiece W is accumulated as an elastic force (elastic energy) accumulated in the pneumatic cylinder 6, or as a magnetic repulsive force of the buffer magnets 9 and 10, and the rest The portion is consumed as a damping force of the pneumatic cylinder 6 or the like, and the workpiece W is temporarily stopped as shown in FIG.

  Here, since the elastic force and magnetic force accumulated in the pneumatic cylinder 6 and the buffer magnets 9 and 10 are storage forces, the workpiece W received by the stopper member 7 is upstream of the workpiece transfer path 51 (left side in FIG. 2). 4 right side or left side of FIG. 6), at this time, the rolling of the upper roller 4 in contact with the surface of the workpiece W is prohibited by the one-way clutch 28 and the workpiece W is pushed back. Friction force that disturbs is generated.

  Then, the workpiece W that is about to be rebounded to the upstream side (the left side in FIG. 6) of the workpiece transfer path 51 is rubbed against the upper roller 4 and rubbed against the upper roller 4 to be stopped. Moreover, since the elastic force of the pneumatic cylinder 6 and the magnetic force of the buffer magnets 9 and 10 are consumed by the friction between the workpiece W and the upper roller 4, the workpiece W is not rebounded upstream of the workpiece transfer path 51. In addition, it is completely stopped at a predetermined position.

  Of course, the surface of the workpiece W at this time may be slightly scratched by the upper roller 4, but the edge of the workpiece W against which the upper roller 4 comes into contact is trimmed by a press device in the next process. Since it is a part excised from work W, it is avoided that the quality of the product manufactured using work W falls.

  When the workpiece W is stopped and positioned, the workpiece W is detected by the proximity switch 19, and when this detection signal is output to a control device (not shown), the control device causes the pneumatic cylinder 6 to The compressed air supply port is switched via a solenoid valve (not shown), the cylinder rod 14 is inserted into the cylinder body 15, and the upper roller 4 is retracted from the workpiece W. Thereafter, the work W is loaded into a subsequent press apparatus (not shown) by a transport mechanism (not shown) such as a loader.

  After the workpiece W is put into the pressing device, the compressed air supply port of the pneumatic cylinder 6 is switched again by the electromagnetic valve, so that the cylinder rod 14 protrudes from the cylinder body 15. Then, the swing arm 5 is rotated in the direction opposite to the above (counterclockwise direction in FIG. 2), and the upper roller 4 is moved forward along the retracted track M toward the upstream side of the workpiece transfer path 51, and the upper side is moved upward. The roller 4 is returned to the starting position of the retreating track M, and the preparation for stopping the next workpiece W is completed.

  The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed. For example, in this embodiment, a pair of permanent magnets is used as the buffering means. However, the buffering means is not necessarily limited to this, and an electromagnet, an air cushion, or the like may be used.

  In this embodiment, the direct acting pneumatic cylinder 6 is used as the biasing means. However, the damping means is not necessarily limited to this. For example, the biasing force (elastic force) is applied to the swing arm. ) And a dampening force, a rotary attenuator (shock absorber) or a hydraulic cylinder may be used.

  Furthermore, in the present embodiment, the upper roller 4 is configured to move along the retreat track M by swinging the swing arm 7, but the means for guiding the upper roller is not necessarily limited to this. Instead, for example, an arc-shaped groove on which the upper roller is slidably and slidably engaged may be provided, and the upper roller may be guided along the groove.

It is a right view of the destack feeder equipped with the workpiece | work stop apparatus which is one Example of this invention. It is the right view of the workpiece | work stop apparatus which expanded the part of FIG. It is a top view of a workpiece | work stop apparatus. It is a left view of a workpiece | work stop apparatus. It is a longitudinal cross-sectional view in the II-II line of FIG. It is a side view for demonstrating operation | movement of a workpiece | work stop apparatus.

Explanation of symbols

1 Work restraint device (sheet material restraint device)
3 Lower roller (lower roller, part of a pair of rollers, part of a pair of guide members)
4 Upper roller (upper roller, part of a pair of rollers, part of a pair of guide members)
5 Oscillating arm (oscillating arm, part of roller guide member, part of urging means)
6 Pneumatic cylinder (pneumatic cylinder, depressurizing means, part of energizing means)
7 Stopper members 9, 10 Buffer magnet (a pair of magnets, buffer means)
11 Rotating shaft (Rotating shaft of the lower roller)
12 Rotating shaft (Rotating shaft of upper roller)
13 Oscillating shaft (oscillating shaft, part of roller guide member)
14 Cylinder rod (Pneumatic cylinder rod)
7a Front part of stopper member (abutting surface)
21 Slide unit (slide member)
26 Adjustment bolt (magnetic force adjusting means, stopper position adjusting means)
28 One-way clutch 51 Work transfer path (transfer path)
M Retreat track W Workpiece (sheet material)

Claims (9)

In the sheet material restraining device for restraining the sheet material that is slid from the upstream side to the downstream side of the transport path and is transported at a predetermined position,
A stopper member disposed on the downstream side of the transfer path to stop the sheet material by abutting with the front edge surface in the transfer direction of the sheet material;
A pair of guide members disposed upstream of the stopper member in the transfer direction and in contact with the front and back surfaces of the front edge of the sheet material transferred along the transfer path, respectively;
A biasing means that biases at least one of the pair of guide members against the sheet material, thereby pressing the pair of guide members against the front and back surfaces of the sheet material and depressurizing the sheet material; The sheet | seat material control apparatus characterized by having.   The sheet material restraining device according to claim 1, wherein the pair of guide members are a pair of rollers that are rolled in contact with front and back surfaces of the sheet material transferred from the upstream side of the transfer path. In the sheet material restraining device for restraining the sheet material that is slid from the upstream side to the downstream side of the transport path and is transported at a predetermined position,
A lower roller whose outer peripheral upper end surface is substantially flush with the upper surface of the transfer path, and is rotatable about a rotation axis whose axis is oriented substantially in the same direction as the width direction of the transfer path;
An upper roller that circumscribes or opposes the outer peripheral upper portion of the lower roller, and is rotatable about a rotation axis whose axis is oriented in the same direction as the transfer path width direction;
A retreat trajectory in which the upper roller rises in a circular arc shape from the starting point position closest to the lower roller to the upper side on the downstream side of the transfer path, passes through the apex position, and then descends in a circular arc shape to the lower side on the downstream side of the transfer path. A roller guide member that guides and moves to follow,
A biasing means that applies a biasing force and a damping force acting in a direction opposite to the guiding direction of the upper roller by the roller guiding member to depressurize the upper roller; and
A stopper member that abuts the front edge of the sheet material in the transfer direction when the upper roller that is reduced by the biasing means reaches the vicinity of the apex position of the retreating track;
A slide member on which the stopper member is mounted so as to be able to reciprocate in the sheet material transfer direction and the counter-transfer direction; and
A sheet material restraining device comprising buffer means for buffering a collision force acting on the slide member toward the downstream side of the transfer path. The roller guide member has a swing arm on which the upper roller is rotatably mounted via a rotating shaft at a distal end portion thereof, and a swing arm provided at a base end portion of the swing arm so that the swing arm can swing. And a swing shaft that supports the
4. The sheet material restraining device according to claim 3, wherein the upper roller is moved backward in an arc along the retracted track by rotation of the swing arm about the swing shaft.   5. The sheet material according to claim 4, wherein the biasing means is a pneumatic cylinder having a rod tip connected to a position separated from a center of the swing shaft supporting the swing arm by a predetermined radius. Stop device.   6. The sheet material restraining device according to claim 3, further comprising stopper position adjusting means for adjusting the position of the stopper member in the sheet material transfer direction or the counter-transfer direction. The buffer means includes a pair of magnets,
One of the magnets is mounted on the slide member together with the stopper member,
The other magnet is disposed on the downstream side of the transfer path so as to face the one magnet.
The sheet material restraining device according to any one of claims 3 to 6, wherein the pair of magnets have opposite surfaces of the same type of magnetic poles.   8. The sheet material restraining device according to claim 7, wherein the buffer means includes a magnetic force adjusting means for adjusting a distance between opposing surfaces of the pair of magnets. While the sheet material in contact with the outer peripheral surface of the upper roller moves in the forward direction of the transfer path, the upper roller rolls around the rotation axis,
9. A one-way clutch that prohibits rolling of the upper roller when the sheet material in contact with the outer peripheral surface of the upper roller tries to return in the reverse direction of the transfer path. The sheet | seat material control apparatus of crab.

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