JP2001025833A - Material feed device of press machine and release control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a material feed device of a press machine which performs a releasing action in following a high speed press machine, is not strongly hit into a band like material and a roll for fixing so as not to damage the material/device. SOLUTION: The device is provided with an opening electromagnet 50 which attracts a moving piece 54 of a moving side roll 20 with magnet force and separates a material from the moving side roll 20, when the moving side roll 20 is pressed to a fixed side roll 10, the material held between both rolls is fed into a press machine by rotation of both rolls 10, 20, and a pilot pin of the press machine is entered into a positioning hole pierced to the material. A closing electromagnet 40 is mounted as facing the opening electromagnet 50, the moving piece 54 of the moving side roll 20 is attracted by the magnet force of the closing electromagnet 40, the material is held by the moving side roll 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used by being incorporated in an automatic manufacturing machine for automatically manufacturing a product through one or a plurality of working steps, and a plate material is put between a pair of rolls or on a gripper of a clamp member. The present invention relates to a feeding device that automatically sandwiches and transfers the plate material from one operation process to another operation process.

[0002]

2. Description of the Related Art Conventionally, a material feeding device for intermittently supplying a material such as a plate material to a working device such as a press machine for executing the next process is provided by a movable clamp which grasps a band-like material and transfers it to a fixed side clamp. A gripper-type material feeder that repeats, a pressing member that urges the moving-side roll 20 to approach the fixed-side roll 10 as shown in FIG. 19, and a pilot pin of a press machine protrude into a positioning hole formed in the material. And a release driving device for separating the moving-side roll 20 from the material of the fixed-side roll 10 against the urging force of the pressurizing member. There was a roll-type material feeder that supplies intermittently. In particular, in order to separate the moving-side roll 20 of the roll-type material feeding device in a direction perpendicular to the material transfer direction, the moving-side roll 20 is provided at the other end of an arm 21 that is swingably provided at one end as a fulcrum. The spring 81 is attached. As such a releasing drive,
Accurate timing control is required so that a pressing member such as a spring can be transferred in synchronism with the front and rear working devices, and an air cylinder type is used at a low releasing speed. Since the pressure transmitting member was air, maintenance and management were easy, and the exhaust could not be exhausted rapidly, so that the function of the shock absorber could be shared. In the case where a high releasing speed is required because an operation delay occurs in the air cylinder type, a cam type is used. Particularly, by directly connecting the front and rear working devices, for example, the power system of the press machine, synchronization with the working device could be easily achieved. In such a cam-type material feeder, only one kind of synchronization timing can be set with one kind of cam, so that fine adjustments due to errors in material thickness, abrasion of the cam and the like, and thermal displacement are skilled operations. In high-speed rotation, it was difficult to determine the timing with the shape of the cam, and durability deteriorated due to wear.

[0003] Furthermore, by using a solenoid-type device capable of instantaneously generating a magnetic force as shown in FIG. 20 as a releas- ing driving device of a roll-type material feeding device, it is possible to follow a high-speed press machine. It is. In addition, since the electronic control allows the timing such as the release time to be set numerically and can be changed during operation, the efficiency is improved, and the structure of the solenoid type member is simple, the production work is easy, and the cost can be reduced. As such a material feeding device, there is a releasing driving device as described in Japanese Utility Model Publication No. 4-48535. FIG. 21 shows a right side view of the material feeding apparatus shown in FIG. Both ends of both rolls are rotatably supported by bearings, and generate a suction force greater than a spring force when the movable roll is released, thereby pulling the movable portion of the biased movable roll back upward. Next, when the separated movable piece approaches the solenoid while being attracted by a constant suction force, it is further attracted by the electromagnetic force and accelerates, and stops at the stopper provided at the end of the stroke. Then, the pressing operation is performed while the holding current is flowing so that the movable portion does not return against the spring. Finally, when the pressing operation is completed, the holding current is stopped, the magnetic force of the solenoid disappears, the moving-side roll is pulled back by the spring, and the release operation ends. Such a releasing operation is often performed within 60 degrees of the crank angle of the press. In the case of the releasing operation alone, the rocking operation is performed six times or more the number of press rotations. 10 from release to closing
This is performed in a short time of millisecond.

Next, a control method of a roll-type material feeding apparatus as shown in FIGS. 20 and 21 will be described. FIG. 22 shows the amount of current to the electromagnet, the moving speed of the moving-side roll, and the moving position from the closed position to the open position of the moving-side roll in contact with the fixed-side roll on the vertical axis, with time elapsed on the horizontal axis. FIG. As for the amount of current flowing to the electromagnet, the upward direction of the vertical axis indicates the current to the opening electromagnet, and the downward direction indicates the current to the closing electromagnet, and the current to the opening electromagnet does not necessarily flow in the opposite direction. Time when release starts (time T
In 1), a current flows through the opening electromagnet, and the attraction force of the electromagnet is started to be pulled at 240 kg, which is 220 kg larger than the elastic force of the spring and the weight of the moving roll itself, if the elastic force of the spring is 200 kg, for example. As a result, the moving-side roll, which was slowly moved at the beginning of the pull, gradually increased its suction force as it approached the end, and accelerated.
At the point of time when the vehicle reaches the release position (time T2), it collides with the stopper at the maximum speed and stops. As a result, when the band-shaped material sandwiched is more than the thickness, the band-shaped material is released and the alignment is performed. During the pressing process, a constant amount of current that does not cancel the magnetic attraction flows through the electromagnet in order to maintain the state (time T3), and is maintained as it is. Then, when the pressing process is completed, the supply of current to the electromagnet is stopped (time T4), the moving-side roll is rapidly pulled back to the closed position by the spring (time T5), the strip-shaped material is sandwiched, and the release state is canceled. The roll rotates and the band material is fed by one pitch.

[0005]

However, for example, 300
An electromagnet that has a greater attractive force than a spring of kg has a large inductance, and it takes time for the magnetic force to become stronger than the spring pressure, which not only delays the opening operation of the releasing operation but also increases the current for the closing operation. Even if it was cut, it took time for the magnetic force to weaken, and the closing operation was delayed, making it impossible to follow a fast press machine. In addition, the magnetic force has the property of being inversely proportional to the square of the distance, the releasing operation starts with the magnetic force that has risen above the spring pressure at the beginning of release, and is accelerated with a force more than twice as close to the end of the stroke of the opening operation, Crash into the terminal stopper. And
In the closing operation, for example, with a spring pressure of 300 kg or more, the moving-side roll is accelerated and collides with the band-shaped material and the fixing roll, possibly damaging the material and the device.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and a material feeder for a press according to claim 1 of the present invention presses a movable roll against a fixed roll. The material sandwiched between the rolls is supplied to the press by rotation of the rolls, and when the pilot pin of the press enters a positioning hole formed in the material, the movable piece of the movable roll is attracted by magnetic force to move the movable roll. In the material feeder provided with an opening electromagnet for separating the material from the material, a closing electromagnet is attached to face the opening electromagnet, and the movable piece of the moving roll is pulled by the magnetic force of the closing electromagnet to move the moving roll. A material feeding device for a press machine, characterized in that a material is sandwiched between the materials. This can reduce the large impact force of the conventional spring, prevent damage to the strip material and equipment, and use a pressure spring by setting the driving force for opening operation to be slightly larger than the mass of the moving roll. The operation starts in an order of magnitude or more shorter than the case in which it was performed, and the magnetic force that is the driving force was reduced, so if the current was turned off, the magnetic force weakened in a short time and the opening and closing of the releasing operation could be performed quickly, and 1200 revolutions per minute were obtained. It can be linked to a press machine. Here, “facing” means to maintain a magnetic force direction parallel to and opposite to the magnetic force direction of the opening electromagnet. An auxiliary coil that is energized in series from the opening electromagnet and the closing electromagnet is additionally mounted on the pair of closing electromagnet and opening electromagnet to cancel residual magnetism during energization switching and release. The operation can be performed smoothly. Similarly, each of the opening electromagnet and the closing electromagnet is energized to be several times as large as the required magnetic force when a magnetic force is generated, and the current in the opposite direction can be demagnetized when the magnetic force disappears. By energizing with a size of about,
The releasing operation can be performed smoothly by canceling the residual magnetism at the time of the energization switching. The invention according to claim 2 is
A material feeding device for a press machine, in which a movable piece of the opening electromagnet adsorbs a closing electromagnet on a surface opposite to a surface on which the opening electromagnet is adsorbed. As a result, the movable portion is shared and the weight is reduced, so that the impact force at the time of a collision is reduced, and quick release is possible. Claim 3
The invention according to claim 1 is the material feeder for a press machine according to claim 1 or 2, wherein the coil of the electromagnet is separated so as to be orthogonal to the movable piece and attached near the movable plate. As a result, the magnetic force of the electromagnet applied to the movable portion increases, and the weight of the electromagnet can be reduced, so that the speed of the releasing operation can be increased.

Further, according to a fourth aspect of the present invention, a driving force is transmitted to the moving-side roll and the fixed-side roll by a timing belt via an intermediate pulley, respectively.
It is desirable that the material feeder of the press be provided with an intermediate pulley of the moving roll on a line connecting the center of the moving roll and the fulcrum and near the fulcrum. With this, even if the moving-side roll and the fixed-side roll sandwich the band-shaped material and the distance from the intermediate pulley changes, the tension of the timing belt can be adjusted. Material feeders are available. Also,
According to a fifth aspect of the present invention, there is provided a press machine provided with a stop member for sandwiching a band-shaped material and suppressing free rotation due to backlash of a gear when a driving force is transmitted to the movable roll via a gear. A material feeder is desirable.

Next, the invention according to claim 6 is based on claim 1,
4. In the material feeder of the press machine described in 2 or 3, the release roll that pulls up the moving roll in the closing position by the opening electromagnet and switches the energization from the opening electromagnet to the closing electromagnet when the moving roll separates from the belt-shaped material. It is a control method. This has made it possible to perform quick releasing with less impact.

According to a seventh aspect of the present invention, the iron core and the movable piece of the electromagnet according to the first, second or third aspect are provided with screw holes and fixed with bolts, and grooves on the surface layer in the magnetic flux direction. This is a material feeding device for a press machine that is provided along and makes it difficult for an eddy current to flow and suppresses heat generation. Accordingly, even in the case of a structure to be screwed, the resistance value can be increased and the amount of current can be reduced by increasing the length of the path of the eddy current accompanying heat generation by switching the magnetic flux direction, thereby making it possible to reduce the amount of heat generation. According to an eighth aspect of the invention, the iron core and the movable piece of the electromagnet according to the first, second, or third aspect are a laminate in which thin plates are in contact with each other along a magnetic flux direction, and are screwed together with bolts. 4. The material feeding device for a press according to claim 1, wherein the material is welded and fixed on a surface provided with the screw hole. This eliminates the mounting parts from the laminated board that was conventionally mounted with stays, etc.
Since the laminated plate can be used as a structure, the number of components to be attached to the electromagnet can be reduced and the size can be reduced. The invention according to claim 9, a material feeding device for a press machine, wherein the opening electromagnet according to claim 1, 2 or 3 can adjust the distance from the strip material in accordance with a releasing distance setting scale member provided on a base frame. . Thus, the scale member is a dial type that rotates with a worm gear, and an opening electromagnet is connected to a bracket that is moved forward and backward by the dial, or a slide type that connects the opening electromagnet to a link member according to the sliding amount. There is something to make. According to a tenth aspect of the present invention, the closing electromagnet, the opening electromagnet, and the moving roll capable of performing the high-speed releasing operation according to the first, second, or third aspect are mounted on the base frame via the thin plate-shaped connecting member. The base frame placed on the mounting base via the rubber legs is fixed to the projecting member projecting from the mounting base inside the base frame via the base frame connecting member. This is a material feeding device of a press machine that is fixed in a vertical direction and allows swinging in a vertical direction. As a result, only a slight vertical movement required for a high-speed releasing operation is allowed, and a material feeder can be provided at low cost without using a structurally complicated gear guide or bearing as in the related art.

In the material feeder for a press machine according to an eleventh aspect of the present invention, a movable side clamp is provided so as to be reciprocable in a feeding direction of the band-shaped material, and the movable side clamp is pressed against the holding surface to hold the band-shaped material. A belt-like material sandwiched by the holding member is supplied to the press by feeding the holding member, and when a pilot pin of the press enters a positioning hole formed in the material, the holding is performed. An electric material feeder for a press machine, comprising: a closing electromagnet for pressing the holding member against a holding surface; and an opening electromagnet for lifting the holding member from the holding surface. It is. As a result, a large impact force due to the conventional spring biasing force can be reduced, and damage to the band-shaped material and the device can be prevented. In addition, the driving force for opening and closing operation is set to be slightly larger than the mass of the holding member, so that the spring is used. The operation starts in an order of magnitude shorter than the case, and the magnetic force as the driving force is reduced, so if the current is turned off, the magnetic force weakens in a short time and the opening and closing of the releasing operation can be performed quickly, and the press at 1200 revolutions per minute can be obtained. Can be linked to the machine.

Means for preventing abrasion of device members in a grip-type material feeding device compatible with such a high-speed press will be described. The driving member is not limited to the timing belt type, but is intended for a device capable of linear driving such as a rack and pinion type, a linear motor type, a ball screw type, and a crank type. According to a twelfth aspect of the present invention, there is provided a material feeding device for a press machine, in which a feed start position at which the moving side clamp grips the strip material or a position at which the strip material is gripped by the pitch are regularly changed. In other words, the control device calculates the feed start position, the position where the band-shaped material is grasped for the pitch, the amount to be changed, the range to be changed, and the frequency of the change so that the wear amount becomes uniform, and moves based on the calculation result. By controlling the feed start position of the side clamp or the position where the band-shaped material is gripped by the pitch, the range of use of the driving member of the movable side clamp is widened and local wear is prevented.

According to a thirteenth aspect of the present invention, a moving position detector which is more durable than accurate is attached to a moving side clamp of a linear motor type driving member, and a difference from the accurate moving position is determined by an error. This is a material feeder of a press machine which records in advance as a table and corrects a detection position of the detector with a difference in the error table. This allows
The durability of the detector can be improved similarly to other members, corresponding to a high-speed press.

Next, another means for preventing abrasion of device members in a grip-type material feeding device corresponding to a high-speed press will be described. According to a fourteenth aspect of the present invention, in the material feeding device for a press machine, the movable clamp is provided detachably with respect to a driving member that reciprocates in the feeding direction of the band-shaped material, and the movable clamp is moved from the driving member at an initial position of the movable clamp. Then, the mounting position of the driving member is changed by changing the position of the driving member. For more information,
The control device calculates the initial position, the total reciprocating amount (distance) of the feed-moving-side clamp, the amount to be changed, the range to be changed, and the frequency of the change so that the wear amount is even, and based on the calculation result, the moving side is determined. By controlling the initial position of the clamp and the amount of idling of the driving member at the time of release, the range of use of the driving member of the moving-side clamp is widened and local wear is prevented.

Next, the control means in the electric material feeder corresponding to such a high-speed press will be described. The first is a means for avoiding an erroneous setting input to the material feeder. A material feeder for a press according to a fifteenth aspect of the present invention is a material feeder having a detector for detecting rotation of a crankshaft of the press, wherein a feed length, a feed acceleration, and a feed stroke of the material are determined in advance. The control unit is provided with a storage unit for inputting a start angle and an end angle. Immediately after the press machine starts from 0 degrees, the rotation signal obtained by the detector is sequentially compared with the following rotation speed calculated by the control unit. And a control unit for emergency-stopping the press machine when it is determined that the measured speed of the press machine cannot exceed the speed measured by the press machine than the follow speed of the feed machine.
The detector that detects the rotation of the crankshaft of the press machine includes a rotary encoder that detects the crankshaft itself of the press machine, a proximity switch that detects the rotation of a flywheel connected by a clutch of the crankshaft, There are limit switches.

Secondly, there is provided a means for judging abnormality of a synchronization signal outputted from the high-speed press. Claim 16 of the present invention
The material feeder of the press according to the present invention, in the material feeder including a detector that detects the rotation of the crankshaft of the press, by comparing the frequent occurrence order per unit time of two or more detection signals having different detection times. And a controller for emergency-stopping the press machine when it is determined that the order is different.

Third, while the second means uses two or more types of detection signals, a means for using one detection signal and a timer together is used. The material feeder of the press is provided with a detector for detecting the rotation of the crankshaft of the press machine. The control unit is configured to perform an emergency stop of the press machine when comparing the duration with the duration of the timer and determining that the duration of the detection signal after the second time exceeds a predetermined range of the duration of the timer. Is a material feeding device. In addition, the status of the synchronization signal output from the press machine is not displayed on the press machine, so it takes time to check the timing settings and check for failures, and the recovery work may be delayed due to misidentification of peripheral equipment as abnormal There is. Therefore, the invention according to claim 18 is based on claim 15,
The detector according to 16 or 17 is a material feeder for a press machine that is connected to a monitor lamp attached to an operation panel of the feeder and notifies an operator of the presence or absence of a synchronization signal output from the press machine. As a result, the display is displayed on the operation panel seen by the operator, so that a timing setting error or a failure can be quickly confirmed, and a quick recovery process can be performed. Furthermore, in order to improve the seismic resistance of the detector against high-speed rotation vibration, the present invention is applied to claim 19.
The invention according to claim 15, wherein the detector according to claim 15, 16 or 17 is connected to a rotating shaft of a belt attached to a crankshaft provided with a clutch and a flywheel of a press machine by another belt, and the detector Is a material feeder of a press machine fixed through rubber feet. As a result, since the belt is not stretched with the same strength as the crankshaft of the press machine, the detector is not damaged even with a small load-bearing device.

Further, as a drive motor suitable for a linear moving body of the grip-type material feeding device, the moving-side clamp may be mounted on the linear moving body of the grip-type material feeding device in the feeding direction of the band-shaped material. With a motor that can reciprocate to, permanent magnets are arranged so that the magnetic poles are alternately switched to one of its stator or mover or rotor,
On the other side, there is provided an iron core having a salient pole projecting a winding wound around the magnetic pole to be excited, and the mover or the rotor reciprocates or rotates relative to the stator in the arrangement direction of the permanent magnets. A material feeder for a press machine equipped with a motor, wherein the iron cores are arranged in three rows in a direction in which the permanent magnets are arranged, in a moving direction or a rotating direction, or in a lateral direction thereof, and each of the cores is controlled by three-phase vector control. A material feeding device for a press machine including a motor provided with a skew for winding the winding and eliminating output fluctuation. As a result, the output of the motor can be increased, the size of the apparatus can be reduced, and the accuracy of alignment can be maintained for a long time. The skew of the protruding teeth facing the permanent magnet may be provided in any range in which the pitch is adjusted in order to reduce torque fluctuation. In particular, claim 21 is a material feeder of a press machine which is limited to a linear motor which enables a movable clamp to reciprocate in a feed direction of a strip material. And as in the invention according to claim 22, one side of the protruding tooth is attached to the salient pole on which the winding is wound, and an auxiliary salient pole having opposite polarity between the salient poles attached to the protruding tooth. Are arranged alternately in the reciprocating direction at an interval of 1/2 pitch between salient poles, and the other side of the other salient teeth is attached to the auxiliary salient pole, and the salient poles and auxiliary salient poles are arranged side by side. The material feeder of the installed press is suitable. On the other hand, the same applies to a rotary motor.Specifically, when describing the configuration in detail, permanent magnets are arranged so that magnetic poles are alternately switched on one of the stator and the rotor, and the other side is excited facing the magnetic pole. A material feeding device for a press machine, comprising: an iron core provided with salient poles wound with windings; and a rotary motor that rotates a rotor with respect to a stator in an arrangement direction of the permanent magnets. The core is arranged in three rows in the direction in which the permanent magnets are arranged, and the material feeder of a press machine includes a rotary motor that winds the windings, each of which is controlled by three-phase vectors.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a material feeder for a press machine according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of the apparatus viewed from the same direction as FIG. 20, and FIG. 2 corresponds to a right side view of FIG. Reference numeral 10 denotes a fixed-side roll fixed to a base frame, and both ends thereof are rotatably mounted by bearings 11. Reference numeral 20 denotes a movable roll fixed to the distal end of an arm 21 which has a base end pivotally supported and can swing up and down, and both ends of which are rotatably mounted by bearings 22, and a rotation driving device together with the fixed roll 10. The two rolls 10 and 20 are intermittently fed to a press machine of the next process while sandwiching the band-shaped material 30 shown by the two-dot chain line by the rotational force given by the above. Reference numeral 40 denotes a closing electromagnet that presses the moving-side roll 20 against the fixed-side roll 10 in order to pinch the belt-shaped material 30 and is fixed to the base frame. The closing electromagnet 40 has a coil 42 wound around the center of a U-shaped iron core 41, and a buffer plate 43 made of a non-magnetic material at both ends of the iron core 41.
Is installed. A movable plate 44 magnetically attached to the closing electromagnet 40 via a buffer plate 43 is fixed to the extension member 21 a extending from the protruding end of the arm 21. On the other hand, reference numeral 50 denotes an opening electromagnet which separates the moving roll 20 from the fixed roll 10 to release the belt-shaped material 30 when the press machine is released, and which is fixed to the base frame and has a U-shaped iron core 51. A coil 52 is wound around the center, and a movable plate 54 is attached to the lower end of the iron core 51 via a buffer plate 53. Then, the movable plate 54 magnetically attached to the opening electromagnet 50
Is fixed to the arm 21 to which the moving-side roll 20 is attached. As described above, the closing electromagnet 40 and the opening electromagnet 50 are connected to the moving roll 2 of the rotating arm 21.
0, and the movable plates 44 and 54 are also disposed so as to face each other with the movable roll 20 therebetween.
It is fixed to the arm 21 so as to be opposed to each other with respect to 0.

Even if the energization is switched between the closing electromagnet 40 and the opening electromagnet 50, the arm 21 is not moved due to residual magnetism.
Since the swing of the opening electromagnet 50 is delayed, the auxiliary coil of the opening electromagnet 50 is attached around the coil of the closing electromagnet 40 while the coil end of the opening electromagnet 50 is kept in the same direction. When the current is supplied to 50, the magnetic flux generated by the auxiliary coil wound in the opposite direction to the closing electromagnet 40 cancels out the residual magnetism of the closing electromagnet 40, so that the movable plate starts to move faster and the force for pulling out is small. The impact speed is low and the impact is reduced. In particular, although the remanence of the closing electromagnet 40 is larger, the auxiliary magnet of the closing electromagnet 40 may be attached to the opening electromagnet 50 to reduce the remanence of the opening electromagnet 50. In addition, the auxiliary coil can be wound not only around the outer circumference but also mixed or wound inside. Furthermore, by not only attaching the auxiliary coil but also instantaneously flowing in the opposite direction to the current flowing in the coil at a short time when there is residual magnetism in the coil of the opening electromagnet 50 and the coil of the closing electromagnet 40, The remanence can be canceled out to make the movable plate start moving faster.

The operation of the material feeder of the above press machine will be described. When the belt-shaped material 30 has been fed one pitch by the two rolls 10 and 20, the energization of the closing electromagnet 40 is stopped to reduce the magnetic force, the magnetic force of the opening electromagnet 50 that has been energized increases, and the attracted movable plate 54 is fixed. The moved arm 21 is swung in a direction to pull the moving-side roll 20 away from the fixed-side roll 10. The pressing process is performed in a state where the pilot pins are inserted and positioned in the pitch holes of the band-shaped material 30 thus opened. Next, the energization of the closing electromagnet 40 is resumed, the magnetic force increases, the magnetic force of the opening electromagnet 50 that is not energized weakens, and the arm 21 fixing the movable plate 44 attracted to the closing electromagnet 40 fixes the moving-side roll 20. It is swung back in the direction of pressing against the side roll 10 and is rotated by the two rolls 10 and 20, and thus the strip material 30 of the next pitch is sent out to the press.

FIG. 3 illustrates another embodiment of the material feeder of the press according to the present invention. In the embodiment shown in FIGS. 1 and 2, the movable plates 44 and 54 are provided in the vertical direction in which the movable roll 20 swings. In the embodiment shown in FIG. 3, both sides of the movable plate 54 are supported. The extension electromagnet 5 fixed to the base frame is extended in the gap formed between the movable plate 54 and the moving-side roll 20 while extending the extension members 23 of the arm 21 to be extended upward.
0 is arranged, and the movable plate 54 is attracted not only to the opening electromagnet 50 but also to the closing electromagnet 40 so as to be shared.
The electromagnet that gives the swinging driving force by reducing the mass of the arm 21 to which the movable plate 54 is attached can be reduced in size, and the impact can be reduced.

FIGS. 4 and 5 illustrate another embodiment of the electromagnet used for the material feeding device of the press. FIG.
In the embodiment shown in FIG. 3, the coils 42, 52 are located at the center between the bent portions of the U-shaped iron cores 41, 51, whereas in the embodiment shown in FIG. The coil is divided into two parts, and the coils are wound around the ends of the U-shaped bent portions which are not protruded from the respective iron cores 41, 51, and are brought close to the movable plates 44, 54, respectively. As a result, the magnetic force can be increased by 10% to 20% even when the ampere-turn which is the product of the number of coil turns and the current value is the same, so that the distribution magnet can be reduced in size and the inductance and iron loss can be reduced. . Here, the extension member 23
Are extended by a closing electromagnet 40 and an opening electromagnet 50.
Of the moving side roll 20 or the arm 21
However, the position at which the movable plate 54 is attached is not limited to this. For example, as shown in FIG. 6, the extension member 23 is attached to the distal end of the arm 21 in the longitudinal direction. Any position that does not hinder carrying in and out may be used. Reference numeral 60 denotes a releasing distance setting scale member capable of adjusting the distance from the belt-shaped material 30 to the opening electromagnet 50. The dial 63 rotated by the worm gear 61 causes the bracket 63 to move up and down in the vertical direction. An opening electromagnet 50 is connected to the lower end of 63 and can be adjusted in advance by the thickness of the band-shaped material 30 to be sandwiched. In addition to the dial type, a slide type in which an opening electromagnet is connected to a link member corresponding to the sliding amount may be used.

FIG. 7 illustrates a drive transmitting member to both the rolls 10 and 20. The drive motor 90 is connected to the timing belt 9.
The two intermediate pulleys 92 and 93 are rotated by 1, and the respective intermediate pulleys 92 and 93 are connected to the fixed-side roll 10 and the movable-side roll 20 by timing belts 94 and 95, respectively, so that rotational power is given. In particular, the intermediate pulley 92 and the timing belt 94 of the movable roll 20 are not provided in the other drive transmission members, and the fixed roll 10 and the movable roll 2 are not provided.
When the driving force of the driving motor 90 is transmitted to the moving roll 20 via the gear of the fixed roll 10 when the gears respectively fixed to the two rolls are engaged with each other, the belt-shaped material is connected when sandwiched between the two rolls. The driving force transmitting member shown in FIG. 7 has improved the durability of the parts by eliminating the deviation of the feed dimensions and the meshing noise of the gears. The drive transmission member shown in FIG. 7 uses an aluminum intermediate pulley instead of a gear to not only reduce the weight of the arm 21, but also eliminates maintenance work for lubricating the gear and eliminates oil stains. Further, since the intermediate pulley 92 of FIG. 7 is disposed near the pivot of the arm 21, even if the belt-like material is fed and the intermediate pulley 92 moves up and down together with the arm 21, the distance from the pivot will not change. The timing belt 94 can reliably transmit the driving force to the moving-side roll 20.

FIG. 8 is an explanatory view in which the embodiment in which the fixed-side roll 10 is located below and the moving-side roll 20 is located above in FIG. 7 is reversed.
0 indicates that the moving-side roll 20 is located below. The moving-side roll 20 is fixed to the distal end of an arm 21 that is pivotally supported at the base end and that can swing in the vertical direction. The fixed-side roll 20 is located inside the pair of arms 21, and at the upper end of the arm 21, The same members as the releasing electromagnet and the releasing distance setting member of FIG. 4 are attached. The intermediate pulley 92 for transmitting the driving force of the driving motor 90 to the moving roll 20 is mounted not on the arm 21 but on the machine side so that the tension of the timing belt can be adjusted. It is on a line connecting a certain swing fulcrum and the center of the moving-side roll 20 assuming a half thickness of the strip-shaped material, and is closer to the swing fulcrum. The procedure for adjusting the tension of the timing belt is performed by a tension adjusting member of the intermediate pulley 92 after the moving-side roll 20 is placed at an assumed position where the thickness of the belt-shaped material is reduced to half. This makes it possible to easily adjust the tension of the timing belt to such an extent that the driving force can be transmitted to the distance between the movable roll 20 and the intermediate pulley 92 even if the thickness of the belt-shaped material changes, and the backlash of the gears can be adjusted. In addition to eliminating the noise caused by the collision, the feed accuracy has been improved, and the maintenance work of lubricating the gears has been eliminated and the oil contamination has been eliminated.

As means for preventing the feed dimension from being deviated due to the backlash generated in the gears in FIG. 7, a free member of the moving side roll 20 is stopped by attaching a stop member to the moving side roll 20 so that the feed dimension of the belt-shaped material is deviated. Can be prevented. The fixed-side roll 10 of FIG. 9 is attached to the base frame 1 by a bearing 11, and the moving-side roll 20 attached to a swingable arm 21 by a bearing 22 transmits the driving force of the belt 91 by gears 10a and 20a. . An arm 2 is provided at one end of the moving roll 20.
Brake pad 20 urged from 1 by spring 20b
Since c is pressed and free rotation is suppressed, it is possible to prevent deviation of the feed size of the band-shaped material. In addition, the magnitude of the biasing force by the spring 20b may be such that free rotation is suppressed,
It must be smaller than the material feeding force by the motor. Reference numeral 20d denotes a detent pin, which is suspended from the arm 21 and inserted into the brake pad 20c so as not to rotate together with the moving-side roll 20 contacted by the brake pad 20c.

FIG. 10 et seq. Explain a control method of the material feeding device of the press machine shown in FIG. 4, similarly to FIG. FIG.
In the control method shown in FIG. 0, the current flows through the opening electromagnet (time T0) before the time when the release starts (time T1).
Then, an electric current for sandwiching the band-shaped material between the closing electromagnets flows. Since the current of the closing electromagnet is cut off from the time when the release starts (time T1), the attraction force of the opening electromagnet does not need to be strong against the holding force. As a result, the moving-side roll does not accelerate greatly even when approaching the end, and when it reaches the release position (time T2), it is smaller than the time when it is pulled apart by about 240 kg against the spring.
For example, it collides with the stopper at a speed such that it is separated at 40 kg and stops. Similarly, at the end of the release, the moving roll collides with the web at a lower speed than when closed by a spring and stops. As a result, not only the dents on the band-shaped material to be clamped can be reduced, but also the impact force is weakened, and damage to members and impact noise are reduced.

In the control method shown in FIG. 11, a current flows through the closing electromagnet at a stage (time T0) before a current flows through the opening electromagnet (time T1) and the release starts (time T1). I have. The attraction force of the opening electromagnet from the time when the release starts (time T1) is 80 kg smaller than that of the spring but larger than that shown in FIG.
As a result, the moving roll can shorten the time to approach the end. Since the impact force on the stopper is large as it is, power is supplied to the closing electromagnet 40 to decelerate. Such a biasing force cannot be used temporarily in a device using a spring, and instantaneous switching becomes possible only by using an electromagnet in both directions. In addition to reducing damage to members and impact noise, the time required for one cycle could be shortened. Then, the positioning is performed by the release, and during the pressing process (time T3 to T5), a constant amount of current that does not cancel the magnetic attraction force starts to flow to the electromagnet and is maintained as it is. The current supply to the opening electromagnet is switched to the closing electromagnet (time T5) in order to clamp and feed the sandwiched band-shaped material to prepare the next material (time T5). Is supplied to the opening electromagnet 50.

The control method shown in FIG. 12 is an effective means when it is desired to set a wide allowable range because the thickness of the band-shaped material varies, and particularly when the thickness is large, the moving roll 20 is moved from the predetermined collision position. Premature collision can be prevented. That is, in FIG.
In the case of 7, the energization for maintaining the state is stopped, and the moving roll 20 reaches the open position and the closed position by inertia. Accordingly, in addition to the above effects, even when the moving roll collides earlier than the predetermined collision position when the thickness of the belt-shaped material is large, the pressing force by the electromagnet is not applied and the collision force can be reduced.

The control method shown in FIG.
The moving range of the moving roll 20 is changed by switching the electromagnet in the middle of the moving to apply the applying force in the opposite direction, instead of setting the moving range of 0 to the same range as the conventional range from the closed position to the open position. The required time is shortened by halving. It is to be noted that the switching time T2 needs to be appropriately adjusted so as to secure a movable amount of the movable roller 20 that can be released.

In the control method shown in FIG. 14, when the closed state is maintained at time T3 in the control method shown in FIG. 13, the opening electromagnet 50 is energized to perform the deceleration processing from time T3 to time T3.
4 is performed. As a result, in addition to the above effects, the collision speed was reduced, the impact force was reduced, and the required time could be reduced. The release operation is ensured by feeding back the movement of the electromagnet to the control device using a detector such as a linear sensor.

On the other hand, when the current value at T1 in FIG. 10 is observed in detail together with the output values of the magnetic force lines, as shown in FIG. 23, the voltage and current are output from the time T1 by the two-dot chain lines V2 and I2 to generate the magnetic force. However, the generated magnetic field lines become eddy currents that initially resist the weak magnetic field lines M0 that are generated in a normal state, and have a small rise. Since the steady clamping force Mn is reached, and the current I4 and the magnetic force M4 gradually decrease only slowly even when the voltage is set to 0 as indicated by V4 for magnetic force elimination, the reaction is slow.
It was found that the magnetic force could not be obtained by integrating the number of turns of the coil and the current in the transient state. In view of the above, the present invention provides a feeder which can instantaneously obtain a steady clamping force Mn even in a transient situation and follow a high-speed press. FIG. 24 is a block diagram showing the control unit of the feed device, and shows the feed device control unit of the movable clamp. The feed device control unit of the fixed clamp has the same configuration except for the rail drive unit. When the operator inputs a required clamping force value from the data input unit 101, the feeding device control unit 100 generates a steady current value In for maintaining the clamping force, and generates a magnetic field equivalent to several times the steady value. The initial current value I1 and the current value at the time of release, which is opposite to the current of the steady value, are calculated by the CPU 102, and the respective energization times are calculated by the CPU 102.
It is stored in the RAM 103 in advance. Then, when the press machine starts and the moving side clamp comes to the feed start position, the detector 10
When 4 is detected, power supply to the feeder mechanical unit 106 via the power input / output unit 105 is started. When the initial target current value previously stored in the RAM 103 is reached, the material is started to be fed while holding the feeder mechanical unit 105 to a constant steady current value by current servo control. When the material is fed, the fixed clamp grasps the material, and the movable clamp
The current I3 stored in M is applied in the reverse direction to erase the magnetic force, release the material by the urging force of the spring, and return to the material feeding start position.

FIG. 15 is an end view of the iron core 51 from which the coil 52 is omitted, which is indicated by lines AA and BB in FIG.
If the electromagnet is switched to the electromagnet at a high frequency so as to be adapted to a high-speed press machine, a huge amount of heat is generated, and a method for suppressing the heat generation is required. The outer peripheral shape of the iron core 51 may be either a square pillar or a cylinder. (A) is a square pillar, and (B) is a plurality of grooves 70, 70,. is there. The depth of the heat radiation groove 70 may be a constant depth as shown in (B), but it is necessary to make it shallow when there is a possibility of structural weakness or breakage as in the corner of (A). is there. The longer the groove 70 is in the eddy current direction, the smaller the heat generation. In particular, it is known that when a thin plate is laminated on the iron core of the solenoid, heat generation is suppressed, but when the thin plate cannot be used due to the structure, the eddy current flowing in parallel to the magnetic flux on the outer periphery of the iron core is By simply forming a slit so as to increase the eddy current path and increase the resistance value to reduce the current, considerable heat generation can be suppressed.

FIG. 16 is an explanatory view similar to FIG. 15 for explaining another embodiment for reducing the heat generation of the iron core 51, and the coil 52 is omitted. (A) is a partially enlarged view of the electromagnet, (B) is a side view of the iron core 51 when (A) is viewed from the front, and (C) is a plan view of a portion where the thin plates of (B) are stacked. Each is shown. The part where the thin plates of (B) are laminated
Since it is fixed by the TIG welding process 71 on the lamination surface, sufficient strength can be obtained even with a structure in which a screw hole 72 is formed and a bolt 73 is screwed, and the whole can be further miniaturized. At the same time, eddy current was reduced to suppress heat generation.

FIG. 17 is a view for explaining the inside of a material feeder with improved earthquake resistance so as not to be damaged by strong vibration during press working. Conventionally, the apparatus main body is mounted on a mounting base 3 of the material feeding apparatus via rubber 7 or a coil spring and connected with a sliding guide member such as a gib or the like to thereby provide a horizontal direction perpendicular to the ram of the press machine. The direction is regulated,
Although mounted vertically, it was difficult to produce a give and it was heavy and expensive. Therefore, first, a mounting member 2 protruding inward and downward from the base frame 1 of the material feeding device placed on the mounting base 3 via the rubber legs 7 and a projecting member extending from the mounting base 3 to the inside of the material feeding device. The provided projecting member 4 is connected by a thin metal plate-shaped base frame connecting member 5a. The base frame connecting member 5a is formed by laminating one or more metal plates. Next, the mounting member 2 protruding from the inside of the base frame 1 and the base end of the arm 21 are connected to each other by a bolt 6 with an arm connecting member 21b in the form of a thin metal plate. Thereby, the minute arm 21 of the releasing operation is
Can be supported. Further, a mounting member 2 protruding from the upper inside of the base frame 1 and two electromagnets 40 and 5 are provided.
0 is connected to the base end of the arm 21 by a bolt 6 with a thin metal plate-shaped arm connecting member 21b. Thereby, it is possible to cope with the minute swing of the arm 21 in the releasing operation.

FIG. 18 is a view for explaining a partial cross section of FIG. FIG. 18A is a plan view of the base frame connecting member 5a in a partial cross section taken along line CC of FIG.
Are screwed into the base frame 1 at two places and with the projecting member 4 at two places with bolts 6, 6,.... As a result, since it is freely fixed to a slight vertical vibration and fixed in the horizontal direction, there is no sliding gap like the conventional gib, high feed accuracy and excellent durability, light weight and low production cost Equipment could be provided. FIG. 18B is a partial cross-sectional view taken along line DD of FIG.
FIG. A mounting member 2 protruding inward from the base frame 1 and a base end of the arm 21 are connected by a bolt 6 with a thin metal plate-shaped connecting member 21b. Thereby, it is possible to cope with the minute swing of the arm 21 in the releasing operation. Note that the upper connecting member 64 also
As in (b), both electromagnets 40 and 50 are connected by bolts 6 to a mounting member 2 projecting inward from the base frame 1 and fixed in the horizontal direction.

FIG. 25 shows another embodiment for improving the vibration isolation. The base frame 1 is placed on the mounting base 3 via the rubber legs 7 in the same manner as that shown in FIG. 17 to absorb minute vibrations and to be attached to the mounting member 2 protruding downward inside the base frame 1. Is connected to a protruding member 4 protruding from the mounting base 3 to the inside by a base frame connecting member 5a in which one or a plurality of thin metal plates are laminated, so that a positional shift due to a large swing or a minute movement is prevented. I'm preventing. The base end of the arm 21 is a fulcrum 2
The lower end 4 is urged upward by a spring 24 fixed to the mounting member 2 to open the material insertion gap in a normal state. The biasing force is, for example, a moving-side roll,
If the total mass of the arm 21 and the movable iron core 44 is several kg, the pulling force of the spring 24 is about 15 kg, and the closing magnet 40 is pressed downward at about 300 kg to apply the belt material 30.
It is not a burden to grab. The closing electromagnet 40 is
The divided coils 42, 42 are formed around the iron core 41, and are integrally attached to a support member 64 of a scale member 60 for adjusting the vertical position of the coil 42. The transmission member 41 a of the movable iron core 41 is inserted through the center hole of the iron core 41 and is fixed to the arm 21.

Further, it is necessary to improve the vibration resistance of the detector attached to the high-speed press corresponding to the feeder according to the present invention, and FIG. 26 is a diagram for detecting the rotational speed and the rotational phase of the press. 2 shows a rotary encoder 80 attached to a crankshaft provided with a clutch and a flywheel of a press machine in a plan view (a) and a side view (b). The encoder 80 includes a base 81
Are located between two brackets 82, 82 projecting from the bracket 82, and four rubber feet 83, 8 are attached to the brackets 82, 82.
3... Are fixed to a mounting plate 84 fixed so as to absorb vibration. A rotary shaft 86 rotatably supported by bearings 85, 85 is provided beside the encoder 80, and a pulley 86a at one end includes an encoder 80 and a belt 87.
The pulley 86b at the other end is connected to the crankshaft of the press by another belt 87b. As a result, the encoder with a small load resistance was broken by setting a high tension to drive it with a belt in the past, but it was optimized to the tension required for driving by interposing the rotary shaft 86 on the crankshaft of the press machine. The belt tension can be set too high at the installation site to prevent breakage. The pulley 8
The position of 6b may be in the middle of the bearings 85, 85,
It may be located between the bearing 85 and the pulley 86a, or may be positioned outside the pulley 86a by extending the shaft length.

In the above-described embodiment, a material feeder using an electromagnet is described as a driving force for moving a rotary roller in a direction orthogonal to a conveying direction of a belt-shaped material. An opposing electromagnet can be used for the grip portion of the returning grip device. FIG. 27 is an explanatory view showing the grip device from the longitudinal direction and omitting an intermediate portion between the belt and the rail. The moving side clamp 110 holding the band-shaped material 30 fed from the left side of the drawing by a gripper 111 is fixed to a transport belt 131 having its lower end attached in parallel with the rail, and is driven by a motor 130 via a timing belt 132 via a rail 133. , And the reciprocating motion of returning to the left direction after the transfer of the band-shaped material 30 to the fixed side clamp 120 is repeated. FIG. 28 shows the moving side clamp 110 of FIG.
FIG. 2 is a longitudinal sectional view cut along a line A. The band-shaped material 30 is inserted between the fixed holding surface 112 and the holding member 114 urged upward by the spring 113, and the support member 11
5, the movable iron core 116 protruding from the holding member 114 which is movable in the vertical direction is attracted to the coil 117 against the urging force of the spring 113, and the holding surface 112 is held by the holding member 11.
The material 30 can be gripped by the pressing of the material 4.
Reference numeral 118 denotes a stopper that limits the upper movement range of the holding member 112. Reference numeral 119 denotes a substrate having a holding surface 112, which is screwed to the conveyor belt 131 by bolts 112a and 112a, and passes through parallel rails 133 and 133. are doing.

FIG. 29 is an explanatory view showing another embodiment of the clamp device. The movable iron core 116 in FIG. 28 has a cross section formed in an inverted T-shape, and a cylindrical coil 117 is arranged around it. On the other hand, the movable iron core 116 in FIG.
It is formed in a □ shape having axes, and a coil 1 is attached to each axis.
17 and a sufficient force is generated even with a small coil by circling the line of magnetic force, so that it can be used for a high-speed press.
Further, in FIG. 28, the insertion gap of the band-shaped material 30 of the holding member 114 is normally opened by the spring 113,
When the coil 117 is energized, the coil 117 is closed by pressing and the band-shaped material 30 is gripped, whereas the opening coil 117 a is located at the position of the stopper 118 in FIG.
16 is mounted facing the closing coil 117. Thus, it is possible to prevent the movable iron core released from the energized coil from being biased by the spring and giving a large impact to the stopper. In FIG. 29B, the holding member 114 is attached to the belt-shaped material 30.
Is pressed upward by the energized coil 117 and is normally urged downward by the spring 113. The urging force of the spring 113 can be reduced by the gravity of the holding member 114. The impact force can be adjusted.

In the gripper feeder which can cope with such a high-speed press machine, the feed operation of the movable clamp is reciprocating at an arbitrary fixed distance compared to the roll type feeder, so that the durability of the drive unit needs to be further improved. There is. For example, the driving device includes a timing belt type shown in FIG.
The pinion 141 is engaged with the servomotor 140 shown in FIG.
A rack and pinion type linear motor 14 shown in FIG. 31 meshed with a rack 142 fixed to the moving side clamp 110.
The linear motor type in which the moving side clamp 110 is fixed to the linearly moving body 145 of FIG.
The moving-side clamp 110 is fixed to a moving body portion 148 screwed to a ball screw 147 rotated by 40. The moving-side clamp 110 is fixed to a pulley connected to a servomotor 140 shown in FIG. Link 150 connecting the lever 149 and the movable side clamp 110
And the like. In a high-speed press machine, for example, it may be used in a situation where the feed pitch is about 10 mm and reciprocates 500 million times a year. Wear tends to occur, and in particular, a small swinging rotation of a ball bearing breaks the oil film and requires frequent replacement of parts. In addition, if you try to change the feed pitch to a longer setting, there will be some displacement from the worn part to the unworn part. become worse.

Therefore, as means for dealing with wear, FIG.
In the linear motor type shown in FIG. 1, this is a means for measuring in advance the error of a sensor with low accuracy and converting it into numerical data to supplement the error in feed accuracy. FIG. 33 is a plan view of the linear motor type whose front view is shown in FIG. A linear encoder 144a is mounted in parallel with the linear motor 144 which is a moving range of the moving side clamp 110, and a built-in sensor head 110a for detecting a built-in linear scale protrudes from the rectilinear moving body 145. Moving side clamp 1
As a sensor for detecting the movement position of 10, a displacement sensor such as a differential transformer, a resolver or a magnetostrictive type having a large thermal displacement and an absolute position error, but not affected by dust and dirt, and having no wear portion is attached, and the accuracy is previously determined. The moving position of the moving clamp 110 is measured based on a high linear encoder, and the difference is stored in the ROM of the control device as an error table. At the time of use, the control unit calculates a correction value based on the difference value obtained from the error table in the ROM using the measurement value obtained by the displacement sensor, thereby obtaining the necessary accuracy for the moving position of the moving clamp 110 and the sensor. The durability was improved.

As another means for dealing with abrasion, the moving clamp is driven by regularly changing the feeding start position at which the moving clamp grips the strip material or the position at which the strip material is gripped by the pitch. Is used to prevent local wear. FIG. 34 shows the physical movement range L of the movable-side clamp as the horizontal axis, and shows the lapse of time in the downward direction of the vertical axis, and indicates the feed start position of the movable-side clamp as S.
It is a figure explaining the situation changing from 1 to S15.
The solid line to the right of the arrow indicates the moving distance of the moving clamp from the start of feeding S to the transfer to the fixed clamp, and the dotted line to the left of the arrow indicates the moving distance to return to the starting position for the next band-like material after the transfer, The material corresponding to the press of one pitch is fed by the set of these two arrows. First, the next feed start position S2 can be changed by increasing the distance of the return dotted arrow with respect to the solid arrow fed by the length of one pitch. This is repeated until the feed start position reaches the start position limit LS of the physical movement range, and the return distance immediately before the feed start position S5 overlapping with the start position limit LS is adjusted to be shorter than that at S4. Next, the feed start position S6 is displaced rightward by shortening the return distance with respect to the constant feed distance indicated by the solid arrow, and the transfer position limit L
e, the return distance immediately before the transfer position of the feed start position S12 reaches the transfer position limit Le is adjusted to be longer than that of S11. Further, the return distance is made longer than one pitch of the press at the next feed start position S13 to be displaced leftward, and returns to the first feed start position S1 at the feed start position S15. As a result, the drive device that moves the movable clamp back and forth can use the movable range over the entire range, so that it is possible to prevent the problem of abrasion using only a part as in the past, and to extend the durability of the device by several times or more. did it.

In the above description, the return distance is increased from the initial position and the next feed start position is displaced in the limit direction of the start position. Can be displaced in the transfer position limit direction. In the above description, when one pitch is fed, the return operation is displaced to the next feed start position by one return operation. However, in another embodiment, the displaced feed start position S
n, the feed distance and the return distance are set to be the same, and the displacing of the feed start position Sn is repeated a plurality of times or for a plurality of pitches. Then, the return operation is changed to the feed distance and the next feed start position Sn + is changed. Can be displaced to one. If the return distance is longer than the feed distance, a minute delay may occur. Therefore, the distance is appropriately adjusted and set based on the number of times and the degree of wear. Further, in FIG. 34, near the center of the movable range L, S1, S8,
In contrast to S15, which is used three times, at the both ends of the movable range L, there is a difference between the use of S8 and S12 each time and the frequency of use. For example, the number of times at each end is set to three times the number of times near the center, and the number of times is gradually increased / decreased at an intermediate position between the center and both ends. Can also be adjusted. This makes it possible to equalize the difference in the frequency of use after the displacement and prevent wear.

As another embodiment for preventing abrasion, in a belt drive system, the same portion of the conveyor belt repeatedly contacts the pulley, so that only that portion wears faster. Therefore,
As shown in FIG. 35, by fixing the fixing member 155 of the movable clamp 110 to the conveyor belt 131, the fixing position to the conveyor belt 131 is shifted. That is, while the fixing member 155 is detachably attached to the transport belt 131 by the detachment lever 155a,
By providing a cylinder member 156 for operating and releasing the release lever 155, the movable side clamp 110
While gripping and fixing the strip-shaped material 30 to the gripper, the cylinder member 156 is instructed to release the lever 15.
5a is pressed to loosen the fixing member 155 from the transport belt 131, and the transport belt 131 is rotated to shift to another fixing position. Then, the cylinder member 156
When the lever is retracted, the removal lever 155a is
The fixing member 155 is fixed to the transport belt 131 by 5b. By repeating this, the movable side clamp can be fixed to the entire conveyor belt, so that the durability of the belt can be greatly extended and the reliability of the feeder can be improved. Further, in order to increase the fixing force of the fixing member 155, an engaging protrusion 131a is continuously provided on the lower surface of the transport belt 131 in the moving direction, and the engaging protrusion 13a is attached to the removal lever 155a.
An engaged projection 155c meshing with 1a is provided.

FIG. 36 shows another embodiment of the fixing member for fixing to the conveyor belt. (A) is an explanatory view of a moving-side clamp obtained by cutting the conveying belt at a plane orthogonal to the moving direction, and (b) is a cross-sectional view taken along line AA of (a). The pressing member 157 that presses the transport belt 131 against the bottom surface of the movable clamp 110 has a guide member 157a inserted through the movable clamp 110 and is urged upward by a spring 157b. Further, the lower end of the overpressure member 157 is formed in an inverted T-shape, and there is a cylinder member 156 provided with an engaging portion that engages with the T-shaped portion 157c and pulled downward. An engagement protrusion 131a and an engaged protrusion 157d are formed on the contact surface between the transport belt 131 and the pressing member 157, respectively, to increase the degree of fixation.

Further, the feeding device corresponding to the high-speed press machine is of a roll type and a gripper type, and when the operator inputs an error such as setting the feed amount too large or setting the feed speed too small, the device is operated at a high speed. Since the engine is started, it is feared that the stopping operation is delayed due to human visual and auditory judgment ability and serious damage to the press machine etc. may occur, and in such a case, the control unit of the feeder is stopped immediately after starting. It is necessary to prevent accidents such as mold damage. In the prior art, when the press machine is started, a check method is to check whether or not the press material has been fed at a feed end expected position of 450 ° after starting from 0 °, and to perform 360 ° ahead of that. It checks whether or not half of the feed length has been sent at the intermediate position of the degree feed, and if not sent, outputs an emergency stop command of the press machine. However, since the high-speed press machine idles for about one revolution before stopping due to inertia, it was not possible to prevent an accident in which the press was run while the wrong material position was used. In contrast, FIG.
Using a rotary encoder capable of detecting the rotation of the crankshaft of the press machine as a sensor using the control unit 100 shown in (1), the confirmation method when starting the press machine is based on the feed length, feed acceleration, feed acceleration of the material in advance. By inputting the desired start angle and end angle of the stroke, the rotation speed of the press machine that the feeder can follow is calculated by the CPU 102 and the RAM 1
03 is stored. Next, as shown in FIG. 37, immediately after the press machine starts from 0 degrees, the follow-up rotational speed read out from the RAM 103 based on the signal obtained by the detector 104, for example, the rotational speed of the press machine is obtained every 1 millisecond. And successive comparisons. When it is determined that the measured speed of the press cannot exceed the measured speed of the press than the speed of the feeder, the output is output to the emergency stop command unit 107 of the press. Thereafter, the press machine runs idle and stops. The rotation speed of the press machine is stable at about 50 to 100 degrees by crank rotation after startup. If a setting error occurs, an error can be detected before stable rotation and an emergency stop command can be output. The emergency stop can be made approximately 300 to 360 degrees earlier by approximately one rotation of the press machine. Further, the issuance of the emergency stop command is displayed on the display unit 108 of FIG. 24 to indicate that the state is abnormal, and the operator is notified of the abnormality.

Another embodiment of the emergency stop method at the time of starting will be described. In the above embodiment, the rotation of the press shaft is detected by using the sensor as a rotary encoder, whereas in this embodiment, the rotation of the flywheel connected by the clutch of the press shaft is detected by the sensor in this embodiment. The feature is that it is a proximity switch that can be used. Next, the confirmation method using the proximity switch as a detector is as follows.
By inputting the desired start angle and end angle of the feed stroke, the rotation angle of the press that the feed device can follow is determined by CPU1.
The calculation is performed at 02 and stored in the RAM 103. Next, before the press shown in FIG. 37 is started, a signal obtained from the detector 104 which is a proximity switch in a ready state in which the flywheel is rotating just before being connected by the clutch is obtained from:
For example, the rotational speed of the flywheel is obtained every millisecond, and is sequentially compared with the following rotational speed read from the RAM 103. Then, if it is determined that the measurement speed of the flywheel exceeds the following speed of the feeder and the flywheel cannot be followed, the result is output to the emergency stop command unit 107 of the press machine. As a result, an emergency stop due to an input error or the like can be performed in a preparation state before the press itself starts. It should be noted that the fact that the emergency stop command before preparation has been issued can be displayed on the display unit 108 in FIG. If the press machine itself detects the rotation speed of the fly foil, the rotation speed signal can be electrically and directly used by the control unit 100 of the feeder. Further, in a press using a speed reducer between the flywheel and the crankshaft, processing is performed such that the rotational speed of the flywheel calculated by setting the speed reduction ratio in the control unit in advance is divided by the speed reduction ratio.

Next, as described above, the synchronizing signal output from the clamp shaft of the press machine is input to the control unit, and in the material feeding device which feeds the material in synchronization, the input state of the signal is determined on the feeding device side. It is necessary to notify the worker if the abnormality is detected and to detect the abnormality, and to feed back to the press machine side as necessary to perform an emergency stop. In particular, it is difficult to immediately detect an abnormality in the synchronization signal, for example, once every several thousand times, for example, once every several thousand times, and the detection of an abnormal part may be delayed.
Therefore, a method for determining an abnormality of a synchronization signal of a press machine is provided. Generally, a press machine is equipped with a rotary cam switch, a limit switch, a proximity switch, and an electronic cam switch using a rotary encoder, and outputs a synchronizing signal for switching ON / OFF once with one rotation of a crankshaft. I have. This synchronization signal is used on the sending device side. FIG. 38 shows a time chart of the synchronization signal in four patterns of an abnormal state. Two types of synchronization signals having different ON times during one rotation of the press are regularly repeated as signals A, B, A, and B in a normal state, whereas signal B is abnormal in an abnormal state (1). Since the signal A is missing, the signal A is continuously input.
Is missing, the signal B is continuously inputted. In the abnormal state (3), the signal B is inputted extra, so that the signal B is inputted.
Are continuously input, and in the abnormal state (4), the signal A is continuously input because the signal A is excessively input. In a method of detecting this, in the control unit 100 of FIG. 24, when the signal A or B is input through the detection unit 104, the CPU 103 stores the RAM 103 as it is if it is blank. When there is an input of the next signal B or A,
The signal is compared with the signal stored in the RAM 104, and if it is determined that the signal is of a different type, a procedure of storing the signal B or A as normal and erasing the original memory is performed, and the next signal is further processed. Wait for input. On the other hand, if the signals are of the same type, it is determined that there is an abnormality, and a stop signal 107 is immediately output to the press machine to display an abnormal state on the display unit 108. Although the ON edge is used as the signal determination time, an OFF edge may be used. One signal may be used as an ON edge, and the other signal may be used as an OFF edge. Frequently, the position or type of the detector can be appropriately changed. In addition, three or more types of input signals may be used, and they can be detected by a method that treats in principle that the signals are sequentially output during one rotation of the press.

Further, in order to know whether or not the press machine is outputting the synchronization signal correctly, by using a monitor lamp of a feeder for setting feed and release, ON / OFF detected from the crankshaft of the press machine. Preferably, the signal is displayed by blinking on a monitor lamp of the connected feeding device. Conventionally, when a micro switch or the like of a press machine is out of order, it sometimes takes a long time to return to a normal state by mistake as a malfunction of a feeder. Therefore, by providing a monitor lamp on the feeder, the monitor lamp of the feeder flashes the same as the setting on the press when the press machine outputs the synchronization signal. The operator can judge that the equipment itself has failed. On the other hand, the synchronization signal when the press machine is out of order, the monitor lamp of the feeder does not blink or blinks at a timing different from the setting, so the worker can know that there is a failure in the press machine, Without misunderstanding the failure of the feeder,
Repair work can be done quickly.

While the detection method of FIG. 38 uses two or more types of signals, in the other embodiment, only one type of signal is used, and the abnormality detection method of the input signal using the timer period measurement function is used. is there. First, the signal A or B is turned on.
Or, measure the duration of OFF with a timer and
3 is stored. Then, the ON / OFF duration of the next signal is measured by a timer, and the previous measurement time is stored in RAM.
The data is read from the memory 103 and the CPU 102 performs a comparison operation. The judgment criteria are set so that, for example, a case where there is a difference of 30% or more from the previous time is judged as abnormal, and a case where the difference is less than 30% is judged as normal. , A stop signal 107 is output to display an abnormal state on the display unit 108. FIG. 39 is a time chart of a signal for determining an abnormal state by this detection method. In the abnormal state (5), since the signal B is missing, the duration of the ON state of the signal B is input to be twice or more the previous time,
In the abnormal state (6), the signal A is missing, so that the duration of the OFF state of the signal A is more than twice as long as that in the previous state, and in the abnormal state (7), the signal B is input because the signal B is redundantly input. The duration of the ON state is input shorter than the previous time, and in the abnormal state (8), the extra duration of the signal A is input because the signal A is excessively input. Further, since this method detects whether an input signal output from the press machine is abnormal, it is not necessary to operate the press machine at all times. Therefore, it can be canceled when the press machine is started.

In addition to the electromagnet used in the above embodiment,
Can be used in place of piezoelectric elements and hydraulic cylinders,
In particular, by combining a closing electromagnet with a piezoelectric element or the like as an opening drive member, a small material feeder that does not require a large drive force or drive distance can be provided.

Further, the linear motor 1 used in FIG.
A preferred one as 44 will be schematically described. FIG.
(A) shows an end surface of the front face in which the left-right direction of the figure is the reciprocating direction of the mover 210, and (b) of FIG. 40 shows a bottom face including a partial cross section of (a), and (c) of FIG. Shows the left side of (a). A permanent magnet 212 is arranged on the mover 210 with a skew so that the magnetic poles are alternately switched, and an iron core 213 is provided as a stator facing the magnetic pole of the mover 210 via an air gap. And
The coil 214 is wound around the protruding teeth protruding below the iron core 213 and excited by three-phase alternating current, so that the mover 210 reciprocates with respect to the iron core 213 in the horizontal direction in the figure, which is the arrangement direction of the permanent magnets 212. Can move. Further, the iron cores 213, 213, are arranged in three rows, the longitudinal direction thereof is positioned in the same direction as the arrangement direction of the permanent magnets 212, and the coils 214,. U, V,
Energize the W phase. And each iron core 213 ...
The protruding teeth 215a provided at equal pitches on the surfaces of the salient poles 215 facing the mover 210 are excited. On the other hand, the magnets 212 attached to the mover 210 are arranged with multi-pole magnetization in the reciprocating direction with a skew in order to eliminate torque fluctuation. The mover 210 is arranged so that the pitch distance from the N pole of the magnet 212 to the next N pole corresponds to one pitch of the teeth 215a of the iron core 213. In operation of such a motor, unlike the stepping motor, the UVW three-phase coil is energized by vector control of three-phase alternating current having a phase advanced by 90 degrees in the traveling direction by an electrical angle of 90 degrees. The force or torque is almost constant at any position for a constant three-phase current, there is no extra control to keep the force or the like constant, it is very easy to control, and the pitch moves at 1HZ AC (360 degrees in electrical angle). Is a magnet 212 from the N pole to the next N pole. This eliminates the need to dispose a large number of U, V, and W-phase coils on the iron core in the multipolar direction or the moving direction of the mover. It was possible to solve the problem that the electric resistance was increased by reducing the wire diameter, the calorific value was large, and the continuous rated torque could not be increased. That is, only one of the U-, V-, and W-phase coils is wound around the iron core in the multipolar direction or the moving direction of the mover,
Since the iron cores on which the U, V, and W phase coils are respectively wound are arranged in the axial direction of the mover, the number of salient poles is reduced, the space for winding the coils is increased, and the wire diameter of the coils is reduced. In addition, the continuous rated torque could be increased without increasing the electric resistance value and the heat value. In addition, since the position or phase of the mover cannot be specified by the electrical information for three-phase control, the information is combined with the three-phase control information so as to use information from a sensor or encoder that detects the position of the magnet attached to the mover. It controls the operation of the band-shaped material at the gripping position and the separating position. As a result, compared to conventional motors that output the same amount of torque, they are excellent in miniaturization and weight reduction, can be provided at low cost, and significantly reduce the weight of the linear moving body that becomes a mover under the same load. Since it can be operated at high acceleration and high frequency, the aged wear of the linear guide portion is reduced, and the accuracy of positioning and the like can be maintained for a long time. Therefore, it is most suitable for a grip type material feeding device.

FIG. 41 shows a modification of the embodiment shown in FIG. 40 in the same manner. The salient pole 215 in FIG. 40 has a T-shaped cross section orthogonal to the reciprocating direction of the mover 210, whereas the salient pole in FIG. 41 has an L-shape. And
In the arrangement of the salient poles in FIG. 41, the salient poles 215 in FIG.
An auxiliary salient pole 215b having an L-shaped short side inverted is added at an intermediate position of the pitch arranged in the reciprocating direction of the ten coils, and the energization direction of the coil 214 is changed to the coil 214 of the salient pole 215.
, Or are wound in the opposite direction. Thus, when one phase is excited, the salient pole 215 in FIG. 40 is one magnetic pole, whereas in the case of FIG.
Since 15b is the other magnetic pole, it also attracts the adjacent permanent magnet 212, and the attraction area is doubled. This allows the area of the teeth facing the magnet to be the same by making the shape of the salient poles L-shaped, while increasing the suction area of the auxiliary salient poles and simultaneously using the NS magnetic poles of the magnets. Optimization to the grip type material feeder can be achieved.

Further, in order to reduce the size of the coil and the size of the motor itself, in the above-described embodiment, the coils 214 and 214 are wound around the salient poles 215 and 215b, respectively, extending downward from the flat yoke. When the two coils are energized to excite one phase by mounting, as shown in FIG. 42, the salient poles 215 and 215b are connected to each other to form a gate shape, and one coil is provided at the connection point. By winding the coil 214 to generate a magnetic flux in a horizontal direction, one coil can be energized when one phase is excited. 213a
Is formed of a non-magnetic material.

FIG. 43 is an explanatory view including a partial cross section of a modification in which the linear motor shown in FIG. 41 is applied as a rotary type. The salient pole 215 in FIG. 42 has a T-shaped cross section orthogonal to the reciprocating direction of the mover 210, whereas the salient pole in FIG. 43 has an L-shape. The salient poles shown in FIG. 43 are arranged such that the salient poles 215b shown in FIG. Has been added. Also,
43 is wound around the rotor 211 in an annular shape, whereas the coil 214 in FIG. 42 is wound around each salient pole 215. Thus, when excited, the salient poles 215 in FIG. 41 are one-way magnetic poles,
In the case of FIG. 42, since the auxiliary salient pole 215b is the other magnetic pole, the area attracting the permanent magnet 212 is almost doubled.

Further, in order to double the suction area, FIG.
In the embodiment shown in FIG.
0 has a permanent magnet 212 attached to one side,
As shown in FIG. 44, permanent magnets 2
12 can be attached, and iron cores 213 and 213 can be arranged above and below the mover 210 with an air gap therebetween.

FIG. 45 is an explanatory view in which protruding teeth are provided on a stator of a rotary motor as shown in FIG. 27, for example.
FIG. 46 shows a basic form of a three-phase brushless servomotor having three poles, each of which has a coil 214 wound around an iron core 213 and is energized as a UVW phase. Similarly, FIG. 46 shows a 58-pole six-phase servomotor. Salient pole 21 protruding from the cylindrical inner surface of iron core 213
Reference numeral 5 denotes a stack of iron plates, and U, V, and W phases controlled by three-phase alternating current are respectively supplied to three coils 214 wound around the iron core 213 in common. Then, each iron core 213 is provided with a salient pole 21 facing the rotor 211.
A large number of protruding teeth 215a provided at an equal pitch on the surface of No. 5 are magnetized. On the other hand, a permanent magnet 212 is attached to a rotating shaft 216 of the rotor 211 via a yoke 217. I have. And
The rotor 211 sets the pitch from the N pole of the magnet 212 to the next N pole as an electrical angle, for example, 360/58 degrees in FIG.
The north pole and the south pole are arranged every half of the electrical angle. The operation of such a motor is as follows. First, the permanent magnets 212 of the rotor 211 are attached to the salient poles 215 of the iron core 213 which are excited when one of the three phases is energized by the three-phase AC vector control.
Are magnetically attracted to face each other. Next, when the adjacent salient pole is energized and excited, a rotating magnetic field is generated, and the first pole is magnetically attracted to rotate the rotor 211. The pitch at which the third salient pole is energized and moves at AC 1 HZ is from the N pole to the next N pole by the magnet 212 of the rotor 211.
From the U phase to the next U phase at the salient poles 215 of the iron core 213. Thus, it is not necessary to multiply the magnet into, for example, 12 poles or more, and to arrange a large number of corresponding U, V, W phase coils on the iron core in the multipole direction or the rotation direction of the rotor. In addition, the problem that the salient pole which becomes polyphase was formed small, the wire diameter of the coil was reduced, the electric resistance increased, the calorific value was large, and the continuous rated torque could not be increased could be solved. That is, 1 in the direction orthogonal to the axial direction of the rotor.
A coil in which only one of the U, V, and W phases is connected is wound around three iron cores, and three iron cores in which U, V, and W phase coils are wound in the axial direction of the rotor, respectively. Since the rotor is arranged in the center and the rotor is arranged in the center, the number of salient poles per iron core is reduced, and the space for winding the coil is increased, and the heat is generated without reducing the wire diameter of the coil and increasing the electrical resistance. The continuous rated torque could be increased without increasing the amount. In addition, by using information from a sensor or an encoder that detects the position of a magnet attached to the rotor so as to use the information, operation at a gripping position or a separating position of the band-shaped material is controlled. As a result, even in applications where an expensive speed reducer without a backlash was used in the past, a speed reducer was not required, and the motor could be used only.This increased the installation space without a speed reducer, and reduced manufacturing costs. .

A linear motor or a rotary motor having an iron core and a coil whose longitudinal direction is aligned along the reciprocating direction of the mover or the rotational direction of the rotor is not limited in terms of stability of thrust fluctuation, miniaturization, and position. Because the maintenance of alignment accuracy is excellent for a long time, not only the material feeder of the high-speed press but also the actuator that combines information to use the information from the sensor or encoder that detects the position of the magnet attached to the mover or rotor. It can be widely used for machines or devices equipped with

[0059]

The closing electromagnet is attached to the moving roll in opposition to the opening electromagnet by the material feeder of the press having the above-mentioned structure, and the movable piece is drawn by the magnetic force of the closing electromagnet. This is a material feeding device for a press, which holds a material. As a result, the large impact force of the conventional spring can be reduced, and damage to the band-shaped material and the device can be prevented. According to the second aspect of the present invention, the gripping portion according to the first aspect is attached to the movable piece so as to face the opening electromagnet and the closing electromagnet. High-speed delivery has become possible. According to the third aspect of the present invention, since the coil of the electromagnet is divided into two parts and attached so as to approach the movable piece, the magnetic force is increased, so that a faster releasing operation and a reduction in size and weight of the electromagnet can be achieved. Was.

Further, in the invention according to claim 4, a driving force is transmitted to the movable roll and the fixed roll by a timing belt via an intermediate pulley, respectively.
By providing the intermediate pulley of the moving roll on a line connecting the center of the moving roll and the swing fulcrum and near the swing fulcrum, the moving roll and the fixed roll hold the band-shaped material. Even if the distance to the intermediate pulley changes, the tension of the timing belt can be adjusted. Therefore, even for belt-shaped materials with different thicknesses, the material feeder can be used with simple adjustment, and the conventional moving side roll and fixed side can be used. Compared to a device in which the rolls are connected by gears, the belt-shaped material is sandwiched and the gap between the two rolls is widened, so that the backlash of the gears is not increased, so that a collision noise and an incorrect feeding position are eliminated. Further, the invention according to claim 5 is characterized in that when the driving force is transmitted to the moving-side roll via a gear, a stop member for sandwiching the band-shaped material and suppressing free rotation due to backlash of the gear is provided. In addition, it is possible to prevent a situation in which the belt is rotated freely and the feeding dimension of the band-shaped material is deviated.

Next, the invention according to claim 6 relates to claim 1,
4. In the material feeder of the press machine described in 2 or 3, the release roll that pulls up the moving roll in the closing position by the opening electromagnet and switches the energization from the opening electromagnet to the closing electromagnet when the moving roll separates from the belt-shaped material. It is a control method. As a result, both directions in which the moving roll was driven could be controlled by the electromagnet, so that it was possible to instantaneously switch the moving direction.

According to a seventh aspect of the present invention, the core and the movable piece of the electromagnet according to the first, second or third aspect are provided with screw holes and fixed with bolts, and grooves are formed in the surface layer in the direction of magnetic flux. It is a material feeder of a press machine provided along. As a result, even with a screwed structure, the passage of eddy currents that generate heat by switching the direction of magnetic flux is longer in the groove, thereby increasing the resistance value and reducing the eddy current, thereby reducing the amount of heat generation. did it. According to an eighth aspect of the invention, the iron core and the movable piece of the electromagnet according to the first, second, or third aspect are a laminate in which thin plates are in contact with each other along a magnetic flux direction, and are screwed together with bolts. 4. The material feeding device for a press according to claim 1, wherein the material is welded and fixed on a surface provided with the screw hole. As a result, the laminated body capable of reducing the heat generation due to the switching of the eddy current direction can be used as an electromagnet by being attached without using a conventional stay or the like. According to a ninth aspect of the present invention, there is provided a material feeding device for a press, which can adjust the opening electromagnet according to the first, second, or third aspect according to a releasing distance setting scale member provided on a base frame, from a strip material. is there. Thus, the scale member is a dial type that rotates with a worm gear, and an opening electromagnet is connected to a bracket that is moved forward and backward by the dial, or a slide type that connects the opening electromagnet to a link member according to the sliding amount. There is something to make. Further, according to the tenth aspect, the first, second or third aspect is provided.
The closing electromagnet, the opening electromagnet, and the moving roll capable of performing the high-speed releasing operation described above are fixed to a base frame via a thin plate-shaped connecting member, and a base mounted on a mounting base via rubber legs. The frame is fixed to the horizontal direction and allowed to swing up and down by fixing the frame to the projecting member projecting from the mounting base inside the base frame via the base frame connecting member. Feeding device. This allows only a small amount of vertical movement necessary for the high-speed releasing operation performed by the closing electromagnet and the opening electromagnet. It is possible to provide a material feeder capable of transmitting the swing, having excellent durability and low production cost.

According to an eleventh aspect of the present invention, in the material feeder for a press machine, the movable clamp is provided so as to reciprocate in the feeding direction of the strip material, and the movable clamp is pressed against the holding surface to hold the strip material. A belt-like material sandwiched by the holding member is supplied to the press by feeding the holding member, and when a pilot pin of the press enters a positioning hole formed in the material, the holding is performed. An electric material feeder for a press machine, comprising: a closing electromagnet for pressing the holding member against a holding surface; and an opening electromagnet for lifting the holding member from the holding surface. It is. As a result, a large impact force due to the conventional spring biasing force can be reduced, and damage to the band-shaped material and the device can be prevented. In addition, the driving force for opening and closing operation is set to be slightly larger than the mass of the holding member, so that the spring is used. The operation starts in an order of magnitude shorter than the case, and the magnetic force as the driving force is reduced, so if the current is turned off, the magnetic force weakens in a short time and the opening and closing of the releasing operation can be performed quickly, and the press at 1200 revolutions per minute can be obtained. Can be linked to the machine.

In the material feeder of the press according to the twelfth aspect, since the moving-side clamp regularly changes the feed start position at which the band-shaped material is gripped or the position at which the band-shaped material is gripped by the pitch, the control device is used. The feed start position, the position where the band-shaped material is gripped for the pitch and the amount to be changed, the range to be changed, and the frequency of the change are calculated so that the wear amount becomes even, and the feed of the moving-side clamp is started based on the calculation result. By controlling the position or the position at which the band-shaped material is gripped by the pitch, the range of use of the driving member of the movable-side clamp is widened to prevent local wear.

According to a thirteenth aspect of the present invention, a moving position detector which is more durable than accurate is attached to a moving clamp of a linear motor type driving member, and a difference between the moving position and the accurate moving position is determined by an error. This is a material feeder of a press machine which records in advance as a table and corrects a detection position of the detector with a difference in the error table. This allows
The durability of the detector can be improved similarly to other members, corresponding to a high-speed press. Further, in the material feeder for a press according to claim 14, the moving side clamp is provided detachably with respect to the driving member for reciprocating in the feeding direction of the band material, and is released from the driving member at the initial position of the moving side clamp. Then, by mutating and attaching the driving member, the range of use of the driving member of the moving side clamp is widened and local wear is prevented.

According to a fifteenth aspect of the present invention, the material feeder for the press machine includes a storage unit in which a feed length, a feed acceleration, and a desired start angle and end angle of the feed stroke are previously input to the control device. Immediately after the press machine starts from 0 degrees, the rotation signal obtained by the detector is sequentially compared with the follow-up rotational speed calculated by the control unit, and the measured speed of the press machine exceeds the follow-up speed of the feeder and cannot follow up. The control unit that makes an emergency stop of the press machine when it is judged can be avoided, so that mistakes in setting input to the material feeder can be avoided. Can be prevented from being damaged. The material feeder for a press according to claim 16 compares the frequent rankings of two or more detection signals having different detection times per unit time, and if it is determined that the rankings are different, the press machine is emergency stopped. By providing the control unit, the abnormality of the synchronizing signal output from the high-speed press can be determined also from the feeder, so that the reliability of the entire system can be improved and, for example, 1 to 1000 times.
Accurate and quick recovery processing can be performed without overlooking even infrequent failures. The material feeder for a press according to claim 17, further comprising a detector for detecting the rotation of the crankshaft of the press, wherein the duration of the first detection signal can be set to the duration of the timer. After comparing the duration of the detection signal after that with the duration of the timer,
By providing a control unit for emergency stop of the press machine when it is determined that the duration of the detection signal after the second time exceeds a predetermined range of the duration of the timer, without using two or more types of detection signals, An inexpensive detection system could be created using a single detection signal and a timer. According to an eighteenth aspect of the present invention, the detector according to the fifteenth, sixteenth, or seventeenth aspect is a press machine that is connected to a monitor lamp attached to an operation panel and notifies an operator of the presence or absence of a synchronization signal output by the press machine. It is a material feeder. With this, when the feeder cannot operate normally because the press does not output the synchronization signal correctly, it is possible to determine that the failure is related to the synchronization signal of the press. You can quickly check when changes are made.
According to a nineteenth aspect of the present invention, the detector according to the fifteenth, sixteenth, or seventeenth aspect is connected to a rotating shaft of a belt attached to a crankshaft provided with a clutch and a flywheel of a press machine by another belt. By fixing the detector via rubber feet, the belt is not stretched with the same strength as the crankshaft of the press machine. This improved the earthquake resistance.

Further, as in the invention according to claim 20, permanent magnets are arranged so that magnetic poles are alternately switched on one of a stator, a mover and a rotor of a material feeder of a press machine, and the other is arranged on the other side. A motor provided with an iron core provided with salient poles wound with windings to be excited in opposition to the magnetic poles, wherein a mover or a rotor reciprocates or rotates relative to a stator in an arrangement direction of the permanent magnets; , The iron core in the arrangement direction of the permanent magnets,
Since the motors are arranged in three rows in the moving direction or the rotating direction or in the lateral direction thereof, and each of which is provided with a skew for winding the windings controlled by the three-phase vector and eliminating output fluctuations, Compared with conventional brushless servomotors, the number of salient poles is reduced and the space for coil winding is increased, so that the wire diameter of the coil is not reduced, the electrical resistance value is not increased, the heat generation is not large, and the continuous rated torque is large. Could increase. Also,
Combined with three-phase control information to use information from sensors and encoders that detect the position of the magnet attached to the mover, etc., it is possible to control the operation at the gripping position and separation position of the band-shaped material, comparable to conventional Excellent in size and weight compared to motors that output less torque, can be provided at a low cost, and can be operated at high acceleration and frequency because the linear moving body that becomes the mover under the same load condition has been significantly reduced in weight. Thus, it is possible to provide a material feeder of a press machine which can reduce the aged wear of the linear guide portion and maintain the accuracy such as alignment for a long time.

[Brief description of the drawings]

FIG. 1 is a front view of a material feeding device of a press according to the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is an explanatory view of another embodiment of the material feeding device of the press according to the present invention.

FIG. 4 is an explanatory diagram of another embodiment related to an electromagnet used for a material feeding device of a press machine.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is an explanatory diagram of an embodiment different from that of FIG. 5 with respect to a mounting position of an electromagnet to an arm.

FIG. 7 is an explanatory diagram of a drive transmission member to both rolls 10 and 20.

FIG. 8 is an explanatory view showing another embodiment of the drive transmission member shown in FIG. 7;

FIG. 9 is an explanatory diagram of a drive transmission member that stops free rotation of a moving-side roll.

10 is an explanatory diagram of a control method of the material feeding device of the press shown in FIG.

FIG. 11 is an explanatory diagram of another control method of the material feeding device of the press shown in FIG.

FIG. 12 is an explanatory diagram of another control method of the material feeding device of the press shown in FIG.

FIG. 13 is an explanatory diagram of another control method of the material feeding device of the press shown in FIG.

FIG. 14 is an explanatory diagram of another control method of the material feeding device of the press shown in FIG.

FIG. 15 is an end view of the iron core 51 with the coil 52 omitted, as indicated by lines AA and BB in FIG. 4;

FIG. 16 is an explanatory diagram illustrating another embodiment for reducing heat generation of the iron core 51.

FIG. 17 is an explanatory diagram illustrating strong vibration preventing means of the material feeding device.

FIG. 18 is an explanatory diagram illustrating a partial cross section of FIG. 17;

FIG. 19 is an explanatory view of a conventional material feeding device.

FIG. 20 is an explanatory diagram of a conventional material feeding device.

FIG. 21 is a right side view of the material feeding device shown in FIG.

FIG. 22 is an explanatory diagram of a control method of a conventional material feeding device.

FIG. 23 is an explanatory diagram showing an observation graph of current and lines of magnetic force at T1 in FIG. 10;

FIG. 24 is a block diagram of a feeder control unit.

FIG. 25 is an explanatory view showing another embodiment with improved earthquake resistance.

FIG. 26 is an explanatory diagram in which the encoder has improved earthquake resistance.

FIG. 27 is an explanatory view showing the grip device from the longitudinal direction.

FIG. 28 is a longitudinal sectional view taken along line AA of FIG. 27.

FIG. 29 is an explanatory view showing another embodiment of the clamp device.

FIG. 30 is an explanatory diagram of a rack and pinion type driving device.

FIG. 31 is an explanatory diagram of a drive device according to another embodiment.

FIG. 32 is an explanatory diagram of a driving device according to another embodiment.

FIG. 33 is a plan view of a linear motor type whose front view is shown in FIG. 31.

FIG. 34 is an explanatory diagram showing a movement range of the movement-side clamp of the movement-side clamp.

FIG. 35 is an explanatory view of a movable clamp that can be removed from a belt.

FIG. 36 is an explanatory view of a removable movable clamp according to another embodiment.

FIG. 37 is an explanatory diagram showing a rotation state of a crankshaft of a press machine in a graph.

FIG. 38 is a time chart of a rotation signal input from a press machine.

FIG. 39 is a time chart of a rotation signal input from a press machine.

40 is an explanatory diagram of the linear motor 144 shown in FIG.

FIG. 41 is an explanatory diagram showing a modified example of the linear motor 144.

FIG. 42 is an explanatory diagram showing a modified example of the linear motor 144.

FIG. 43 is an explanatory diagram showing a modified example of the drive motor.

FIG. 44 is an explanatory diagram showing a modified example of the drive motor.

FIG. 45 is an explanatory diagram showing a modified example of the drive motor.

FIG. 46 is an explanatory diagram showing a modified example of the drive motor.

[Explanation of symbols]

1. Base frame, 2. Mounting member, 3. Mounting base, 4. Projecting member, 5. Connection member, 6. Bolt, 7. Rubber, 10. Roll on fixed side, 11 ..Bearing, 20..Movable roll, 21.Arm, 21c.
・ Rotating swing support point, 22 ・ ・ Bearing, 23 ・ ・ Extension member,
24..spring, 30..strip material, 40..closing electromagnet, 41..iron core, 42..coil, 43..buffer plate,
44 movable plate, 50 opening electromagnet, 51 iron core, 52 coil, 53 buffer plate, 54 movable plate, 60 releasing scale setting scale member, 61
-Worm gear, 62-Dial, 63-Bracket, 64-Support member, 70-Groove, 80-Rotary encoder, 81-Base, 82-Bracket,
83 rubber feet, 84 mounting plate, 85 bearing, 86 rotating shaft, 86a, 86b pulley, 8
7a, 87b · · · belt, 90 · · · drive motor, 91
..Timing belts, 92,93..Intermediate pulleys
94, 95 timing belt, 100 feed device control unit, 101 data input unit, 102 CPU
103 RAM RAM 104 detector 105 power input / output unit 106 feeder machine unit 107 emergency stop command unit 108 display unit 110 clamp on moving side 111 .Gripper, 112... Holding surface, 11
3. spring, 114 holding member, 115 support member, 116 movable iron core, 117 coil, 118
· Stopper, 119 · · · board part, 120 · · · fixed clamp, 130 · · motor, 131 · · · conveyor belt, 13
1a ··· engaging protrusion, 132 ··· timing belt, 13
3-rail, 140-servo motor, 141-pinion, 142-rack, 144-linear motor,
145 ··· Straight moving body, 147 · · Ball screw, 148
..Movable body part, 149..lever, 150..link,
155 ··· Fixing member, 155a ··· Removal lever, 1
55b, pressing spring, 155c, engaged projection 156
· Cylinder member, 157 ··· Pressing member, 157a ··· Guide member, 157b ··· Spring, 157c
57d: engaged projection.

Claims (22)

[Claims] 1. A moving-side roll is pressed against a fixed-side roll,
The material sandwiched between the rolls is supplied to the press by rotation of the rolls, and when the pilot pin of the press enters a positioning hole formed in the material, the movable piece of the movable roll is attracted by magnetic force to move the movable roll. In a material feeder provided with an opening electromagnet for separating the material from the material, a closing electromagnet is attached in opposition to the opening electromagnet,
A material feeding device for a press machine, wherein a movable piece of the moving-side roll is drawn by the magnetic force of the closing electromagnet, and a material is sandwiched by the moving-side roll. 2. The material feeder for a press as a holding part according to claim 1, wherein the closing electromagnet is attracted to a surface of the movable piece of the opening electromagnet which is opposite to a surface to which the opening electromagnet is attracted. 3. The material feeder for a press according to claim 1, wherein the coil of the electromagnet is separated so as to be orthogonal to the movable piece and attached near the movable plate. 4. The moving-side roll and the fixed-side roll include:
The driving force is transmitted by the timing belt via the intermediate pulleys, and the intermediate pulley of the moving roll is provided on a line connecting the center of the moving roll and the fulcrum and close to the fulcrum. The material feeder of a press according to claim 1. 5. The material feeding device for a press according to claim 1, wherein a stop member for suppressing free rotation is provided on the moving-side roll. 6. A material feeding device for a press according to claim 1, wherein the moving roll in the closed position is pulled up by an opening electromagnet, and when the moving roll is separated from the strip material, the opening electromagnet is moved. Release control method that switches the energization from the closing electromagnet to the closing electromagnet. 7. The iron core and the movable piece of the electromagnet according to claim 1, which are provided with a screw hole and fixed with a bolt, and a groove is provided in a surface layer along a magnetic flux direction to allow an eddy current to flow. Material feeder for press machine which is difficult. 8. An electromagnet according to claim 1, 2 or 3, wherein the iron core and the movable piece are a laminate in which thin plates are in contact with each other along the direction of magnetic flux, and are provided with screw holes to be screwed with bolts. The material feeder for a press according to claim 1, 2 or 3, wherein the material is welded and fixed on the formed surface. 9. A material feeder for a press machine, wherein the opening electromagnet according to claim 1, 2 or 3 can be adjusted in distance from a strip material in accordance with a releasing distance setting scale member provided on a base frame. 10. The closing electromagnet, the opening electromagnet and the moving roll according to claim 1, 2 or 3, are fixed to a base frame via a thin plate-like connecting member, and are attached to a mounting base via rubber legs. The mounted base frame was fixed to a projecting member projecting from the mounting base inside the base frame via a base frame connecting member, thereby fixing the base frame horizontally and allowing swinging in the vertical direction. Material feeder for press machine. 11. A moving-side clamp is provided so as to reciprocate in a feeding direction of a band-shaped material, a holding member is provided on the moving-side clamp for pressing and holding the band-shaped material against a holding surface, and the band-shaped material held by the holding member is provided. Is supplied to the press by the feeding movement of the holding member, and when the pilot pin of the press enters a positioning hole formed in the material, the holding member is pulled up to release the material. A material feeder for a press, comprising: a closing electromagnet for pressing a holding member against a holding surface; and an opening electromagnet for lifting the holding member from the holding surface. 12. The moving-side clamp according to claim 11,
A material feeding device of a press machine for regularly changing a feeding start position for gripping a band-shaped material or a position where a band-shaped material is gripped for a pitch. 13. The moving-side clamp according to claim 11,
A material feeding device for a press machine, in which a detector for a moving position is mounted, and a difference from an accurate moving position is recorded in advance as an error table, and a detection position of the detector is corrected based on the difference in the error table. 14. The moving-side clamp according to claim 11,
The driving member for reciprocating in the feeding direction of the band-shaped material is detachably provided, released from the driving member at the initial position of the moving-side clamp, and the mounting position of the driving member is changed by changing and mounting the driving member. The material feeder of the press machine to be made 15. A material feeder provided with a detector for detecting rotation of a crankshaft of a press machine, wherein a feed length, a feed acceleration, and a desired start angle and end angle of a feed stroke are previously input and stored. The control unit is provided with a control unit. Immediately after the press machine starts from 0 degrees, the rotation signal obtained by the detector is sequentially compared with the follow-up rotation speed calculated from the value of the storage unit. A material feeding device, comprising: a control unit that causes an emergency stop of the press machine when it is determined that the measured speed of the machine cannot exceed the measured speed. 16. In a material feeder provided with a detector for detecting rotation of a crankshaft of a press machine, frequent rankings of two or more detection signals having different detection timings per unit time are compared, and the rankings are different. A material feeder, comprising: a control unit that, when it is determined that the press machine has stopped, stops the press machine in an emergency. 17. A material feeder comprising a detector for detecting the rotation of a crankshaft of a press machine, wherein the duration of an initial detection signal can be set to the duration of a timer. Is compared with the duration of the timer, and when it is determined that the duration of the detection signal after the second time exceeds a predetermined range of the duration of the timer, a control unit for emergency stop of the press machine is provided. Material feeder. 18. The detector according to claim 15, 16 or 17, wherein the detector is connected to a monitor lamp attached to an operation panel.
A material feeder for a press that notifies an operator of the presence or absence of a synchronization signal output by the press. 19. The detector according to claim 15, 16 or 17, wherein said detector is connected to a rotating shaft of a belt attached to a crankshaft provided with a clutch and a flywheel of a press machine by another belt. , A material feeder of a press machine fixed through rubber feet. 20. A motor that enables the moving-side clamp according to claim 11 to reciprocate in a feeding direction of the band-shaped material,
An iron core in which permanent magnets are arranged so that the magnetic poles are alternately switched on one of the stator, the mover, and the rotor, and the other side is provided with salient poles provided with windings for exciting the magnetic poles facing the magnetic poles. A material feeder of a press machine having a motor in which a mover or a rotor reciprocates or rotates in a direction in which the permanent magnets are arranged relative to a stator, wherein the iron core is arranged in a direction in which the permanent magnets are arranged. Material of a press machine provided with a motor arranged in three rows in the moving direction or the rotating direction or in the lateral direction thereof, each of which is provided with a skew for winding the windings controlled by three-phase vector control and eliminating output fluctuation. Feeder. 21. A linear motor for reciprocating the moving-side clamp according to claim 11 in a feeding direction of the band-shaped material, and permanent magnets are arranged on one of a stator and a movable element such that magnetic poles are alternately switched. And, a linear motor in which a salient pole provided with a salient pole provided with a winding wound thereon to be excited in opposition to the magnetic pole is provided on the other side, and a mover reciprocates in the arrangement direction of the permanent magnet with respect to the stator. A material feeder for a press machine, comprising: arranging the salient poles in three rows in the direction in which the permanent magnets are arranged; A material feeder for a press machine, comprising a linear motor in which the teeth are aligned in the row direction of the salient poles. 22. The one side of the tooth according to claim 21,
Attached to the salient poles on which the windings are wound, and alternate salient poles of opposite polarity are alternately arranged in the reciprocating direction between the salient poles attached to the protruding teeth at intervals of 1/2 pitch between the salient poles. A material feeder for a press machine, wherein the auxiliary salient poles are arranged so that the other side of the other salient teeth is attached to the auxiliary salient poles, and the salient poles and the auxiliary salient poles are arranged side by side.