JP3221351B2 - Plate bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending machine for bending a plate material, particularly a metal plate at various angles.

[0002]

2. Description of the Related Art Heretofore, as a bending machine of this type, a structure shown in FIGS. 8 to 13 is known.

[0003] In these figures, a folding machine denoted by reference numeral 1 includes a base 2, a lower bending blade (hereinafter referred to as a lower blade) 3 mounted on the base 2, and a base 2 on the base 2. The assembled support frame 4, an elevating plate 5 attached to the support frame 4 so as to be able to move up and down, a driving mechanism 6 for elevating the elevating plate 5, and a lower blade 3 at the lower end of the elevating plate The positional relationship between the upper blade 7 and the lower blade 3 is adjusted by adjusting the moving stroke of the upper folding blade 7 (hereinafter, referred to as an upper blade) and the elevating plate 5 which are attached in a facing state. Thus, a bending angle setting means 8 for setting a bending angle of the plate material W inserted between the two blades 3 and 7 is provided.

More specifically, as shown in FIGS. 10 and 11, the lower blade 3 is formed with a groove 3a having a V-shaped cross section which is open upward at the upper part thereof. The lower portion is formed as a tapered bent blade 7a so as to be inserted into the groove 3a of the lower blade 3.

The drive mechanism 6 includes a crankshaft 9 rotatably supported by the support frame 4 and four crank portions 9a provided on the crankshaft 9 at predetermined intervals in the longitudinal direction thereof. A pair of crank arms 10 rotatably attached to the crank shaft 9 and the elevating plate 5, and an electric motor or a hydraulic motor mounted on the support frame 4 and rotating the crank shaft 9. The motor 11 and the motor 11
And a reduction mechanism M interposed between the crankshaft 9 and the crankshaft 9.

The bending angle setting means 8 is mounted on the support frame 4 and sends a stop signal to the drive mechanism 6. The limit switch 12 is mounted on the lift plate 5, and A position setting mechanism 13 that sets a lower limit position of the lift plate 5 by adjusting a contact position with the limit switch 12 in a lowering direction.

Further, the position setting mechanism 13 includes a support plate 14 integrally attached to the elevating plate 5, and an adjustment shaft penetrating the support plate 14 and rotatably mounted on the support plate 14. 15 and a cam surface 16a which is screwed to one end of the adjustment shaft 15 and has a conical tip.
The cam member 16, the outer periphery of the cam member 16, a cylindrical cover 17 fixed to the support plate 14, and a scale plate 18 fixed to the other end of the adjustment shaft 15 are provided. The cover 1
7, a guide hole 17a is formed along the length direction of the adjustment shaft 15 and the cam member 16
A guide pin 19 is slidably fitted in the guide hole 17a to restrict the rotation of the cam member 16 around the axis and to allow the axial movement of the cam member 16. ing.

The contact 20 of the limit switch 12 has a cam surface 16 below the cam member 16.
It is installed so as to be located on the movement locus of a.

Next, the operation of the conventional bending machine 1 configured as described above will be described.
As a result, the lifting plate 5 is moved to the highest position, and as shown in FIG. 10, the space between the blades 3 and 7 is largely opened, and the plate material W is inserted between the blades 3 and 7.

Next, the crankshaft 9 constituting the drive mechanism 6 is rotated by the motor 11 so that the lift plate 5 connected to the crankshaft 9 is rotated.
Is lowered, and the upper blade 7 attached to the elevating plate 5 is lowered toward the lower blade 3 attached to the base 2.
Is pressed into the groove 3a of the lower blade 3 while pressing substantially the middle part of the two-point support portion of the plate material W supported by the lower blade 3 on the plate material W supported by the lower blade 3.

As a result, the plate material W is bent as shown in FIG.

The bending amount of the plate material W by the two blades 3.7 as described above, that is, the bending angle α of the plate material W
Since the distance between the two supporting portions is constant, the upper blade 7 is brought into contact with the plate W to such an extent that the plate W is not deformed as shown in FIG. Based on a reference (this state is a state in which the bending angle α is zero), it is determined by a stroke S that is further moved from the reference position into the lower blade 3.

Therefore, the bending angle α of the plate material W
Can be set by setting the lowering position of the upper blade 7. For this reason, conventionally, the position setting mechanism 1
The lower position of the upper blade 7 is set by the switch 3 and the limit switch 12.

That is, the adjusting shaft 15 of the position setting mechanism 13
Is rotated, the cam member 16 whose rotation is restricted by the engagement between the guide hole 17 a of the cover 17 and the guide pin 19 moves in the axial direction, and the cam surface 16 a
5 in the axial direction.

For example, if the cam member 16 is moved from the position shown by the solid line in FIG. 12 to the position shown by the dashed line in FIG. As a result, the operation timing of the limit switch 12 with respect to the lowering position of the lift plate 5, that is, the stop timing of the motor 11, is advanced. As a result, the lowering stop position of the lift plate 5 is reduced. Is raised, the stroke S from the reference point of the upper blade 7 is narrowed, and the bending angle α of the plate material W is widened.

The amount of movement L1 of the cam member 16 in the axial direction and the amount of change L2 of the contact position between the contact 20 of the limit switch 12 and the cam member 16 are shown in FIG.
As shown in FIG. 7, a proportional relationship is defined as a constant, a value uniquely determined by the inclination angle of the cam surface 16a of the cam member 16, and further, the axial movement amount L1 of the cam member 16
Since the pitch of the screw formed on the adjusting shaft 15 is constant and is proportional to the amount of rotation of the adjusting shaft 15, by adjusting the rotational position of the adjusting shaft 15, Is set, and the bending angle α of the plate material W is set.

[0017]

However, such a conventional folding machine 1 has the following problems to be improved.

That is, the bending angle setting means 8 for setting the lowering position of the upper blade 7 is formed by screwing the cam member 16 on the adjusting shaft 15, and the rotational movement of the adjusting shaft 15 is controlled by the cam member 16. Since the motion is converted to linear motion, and the position is set by contact between the conical cam surface 16a formed at the tip of the cam member 16 and the contact 20 of the limit switch 12, the operation mechanism is changed. It is complicated and complicated, and in order to realize high-precision positioning,
It is necessary to increase the processing accuracy and the assembly accuracy of the screw portion and the cam surface 16a, and this causes a problem that the production cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a plate bending machine having a simple structure and capable of performing high-precision position setting. Make it an issue.

[0020]

According to a first aspect of the present invention, there is provided a plate material bending machine comprising: a pair of bending blades disposed opposite to each other; By controlling the drive mechanism for relative movement in the direction of approaching and separating from each other, and the relative movement stroke of both folding blades,
A bending angle setting means for setting a bending angle of a plate material to be bent by these bending blades, wherein the bending angle setting means is rotatably mounted on one of the pair of bending blades. When the position setting disk is attached to the other bending blade and the position setting disk is made to face with the relative movement of the two bending blades, the position of the peripheral edge is detected, and the relative movement of the two bending blades is stopped. An optical sensor for stopping the relative movement of the both folding blades at a predetermined relative movement stroke, and the peripheral edge of the position setting disk gradually moves toward the rotation center in one direction of the rotation direction. The position setting disk is rotated to change the position where the periphery of the disk and the optical sensor face each other, so that the relative movement of the bending blades can be reduced. Adjust the over click, it is characterized by being made so as to correspond to the bending angle set.

According to a second aspect of the present invention, there is provided a plate material bending machine according to the first aspect, wherein the bending angle setting means is connected to the position setting disk to rotate the position setting disk. And a control unit that outputs a drive signal to the servomotor and controls the rotation of the position setting disk to a position where a relative movement stroke corresponding to the set bending angle is obtained. I have.

According to a third aspect of the present invention, in the plate bending machine according to the first aspect, the bending angle setting means is connected to the position setting disk to rotate the position setting disk. And a control means for outputting a drive signal to the servomotor to control the rotation of the position setting disk to a position at which a relative movement stroke corresponding to the set bending angle is obtained. A correction amount setting device,
A correction circuit that sends a drive signal to the servomotor based on the correction signal sent from the correction amount setting device and rotates the position setting disk in a predetermined direction by a predetermined amount. The plate bending machine according to claim 1.

According to a fourth aspect of the present invention, in the plate bending machine according to the first aspect, the bending angle setting means controls the driving mechanism to correspond to a bending angle set by the position setting disk. Control means for controlling a position at which a relative movement stroke can be obtained, wherein the control means sends a drive signal to the drive mechanism based on a correction amount setting device and a correction signal sent from the correction amount setting device. And a correction circuit for changing the drive time of the lever drive mechanism.

Further, in the plate bending machine according to a fifth aspect of the present invention, the bending angle setting means is connected to the position setting disk to rotate the position setting disk. A servo motor and a drive signal output to the servo motor to control the rotation of the position setting disk to a position where a relative movement stroke corresponding to a set bending angle is obtained, Control means for controlling a position at which a relative movement stroke corresponding to the bending angle set by the setting disk is obtained, the control means comprising: a first correction amount setting device for correcting the position of the position setting disk; A second step of correcting the position of the driving mechanism;
The position setting disk is rotated in a predetermined direction by a predetermined amount based on the correction amount setting device of the first and second correction amount setting devices, and a driving signal is transmitted to the driving mechanism. And a correction circuit for changing the driving time of the driving mechanism by transmitting the driving signal.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

In the following description, the basic components and the bending mechanism of the plate W are described with reference to FIGS.
1, the common parts will be described with reference to these drawings and the same reference numerals.

The folding machine 1 shown in the present embodiment has a pair of blades 3, 7 arranged opposite to each other, and a driving mechanism 6 for relatively moving these two blades 3, 7 in a direction approaching and separating from each other.
And a bending angle setting means 21 for controlling a relative movement stroke S of the two blades 3.7 to set a bending angle α of the plate material W inserted and bent between the pair of blades 3.7. The bending angle setting means 21 is mounted on a position setting disk 22 rotatably mounted on one of the pair of blades 3 (7) and the other blade 7 (3). An optical sensor 23 for detecting the position of the peripheral edge 22a of the position setting disk 22 by inserting the peripheral edge of the position setting disk 22 with the relative movement, and the peripheral edge 22a of the position setting disk 22 However, the basic configuration is such that the shape gradually approaches the center of rotation as it goes in one direction of the rotation direction.

To explain these details, the bending angle setting means 21 includes a support plate 24 attached to the upper end of the elevating plate 5 to which the upper blade 7 is attached, An adjusting shaft 26 rotatably provided through a bearing 25 and extending through the support plate 24 in a horizontal direction (a direction orthogonal to the moving direction of the elevating plate 5); The position setting disk 22 is integrally attached to one end of the adjusting shaft 26 via a large-diameter flange 26a, and a scale disk 27 is integrally fixed to the other end by bolts 28.

The position setting disk 22 is rotatable about an axis of the adjustment shaft 26 in a plane parallel to the moving direction of the lift plate 5, and together with the lift plate 5, It can be translated in a simple plane.

As shown in FIG. 3, the position setting disk 22 has a peripheral edge 22a gradually approaching the center of rotation as it goes in one direction of rotation (clockwise direction in FIG. 3). Its outer diameter is continuous or
At a position where the maximum diameter portion and the minimum diameter portion are formed, a discontinuous portion is formed on the peripheral edge 22a, and the maximum diameter portion and the minimum diameter portion are formed at predetermined positions. Is the difference between the maximum lowering position and the minimum lowering position of the lift plate 5, that is, the upper blade 7.

The maximum diameter portion is set so that the minimum descending position is higher than the bending start position for the maximum bendable plate thickness.

The relative positional relationship between the scale disk 27 and the position setting disk is such that the discontinuous portion of the position setting disk 22 is located on the negative side of the zero index of the scale disk 27. Relationship has been made.

Further, as shown in FIG. 1, the optical sensor 23 is provided below the position setting disk 22 in the moving direction, and when the position setting disk 22 is lowered, one surface thereof is provided. A light projector 23a positioned on the side;
And a light receiver 23b positioned on the other surface side, and each is fixed to an appropriate position of the support frame 4 via a stay 29.

The light sensor 23 detects its position by blocking the light emitted from the light projector 23a detected by the light receiver 23b at the lower end of the peripheral edge 22a of the position setting disk 22. Then, a control signal for stopping the operation of the drive mechanism 6 is output based on the detection result.

The operation of the bending machine 1 according to the present embodiment having the above-described structure will be described. First, the scale setting plate 27 is rotated to rotate the position setting disk 22, and the position setting disk 22 is rotated. The bending angle α of the plate material W is set by adjusting the position of the lower edge of the plate 22.

Next, after the plate material W is inserted between the upper blade 7 and the lower blade 3 in the same manner as in the prior art, the drive mechanism 6 is operated to lower the upper blade 7 together with the elevating plate 5.

When the upper blade 7 is lowered in this way, the position setting disk 2 attached to the lift plate 5
The lower end of the peripheral edge 22a is inserted into the detection unit of the optical sensor 23 attached at a fixed position below the peripheral edge 22a, thereby blocking light emitted from the light projector 23a.
It is detected that the position setting disk 22 has been lowered to the set position, and the drive mechanism 6 is stopped based on the detection result, whereby the lowering of the elevating plate 5 and the upper blade 7 is stopped. .

Thus, the lowering position of the upper blade 7 with respect to the lower blade 3 is adjusted, and the plate W inserted between the both blades 3 and 7 is bent at the set angle α.

In such a bending operation, in the bending machine 1 according to the present embodiment, the setting of the bending angle α of the plate material W depends on the position of the lower edge of the position setting disk 22 by the rotation operation of the position setting disk 22. Since the adjustment is performed, the setting of the bending angle is realized by a very simple mechanism.

The factors relating to the displacement of the lower end portion of the position setting disk 22 are summarized in the accuracy of the support mechanism of the adjusting shaft 26 and the processing accuracy of the peripheral edge 22a of the position setting disk 22, but in the prior art. As described above, it is not necessary to control the accuracy by combining a plurality of members, and most of them need only control the dimensional accuracy of a single member.

Moreover, the position of the position setting disk 22 is detected by
Since the detection is performed in a non-contact manner by the optical sensor 23, no external force is applied to the position setting disk 22 and the adjustment shaft 26 at the time of position detection. Thus, the position detection accuracy, that is, the bending accuracy of the plate material W is sufficiently ensured.

FIG. 4 shows a second embodiment of the present invention. A driven pulley 30 is integrally attached to the adjusting shaft 26 and a stay 3 is attached to the support plate 24.
1 and a drive pulley 32 is attached to the
The timing belt 33 is wound between 0.32 and 0.32.
A servomotor 34 is connected to the drive pulley 32, and the rotational position of the adjustment shaft 26, that is, the position setting disk 22 is adjusted by the servomotor 34.

With this configuration, the setting of the bending angle can be set electrically, and the position setting disk 2 can be set.
The turning position of 2, that is, the bending angle of the plate W can be set very finely, and the automatic operation can be performed.

FIGS. 5 and 6 show a third embodiment of the present invention.
In the second embodiment described above, a drive signal is output to the servomotor 34 to obtain a relative movement stroke of the position setting disk 22 corresponding to a set bending angle. The control means 35 for controlling the rotation to the position is provided.

The control means 35 sets processing modes such as a specific bending angle (for example, the sharpest bending angle called “chi” or a frequent bending angle of 90 °) and an arbitrary bending angle. A mode selection switch 36, a ten key 37 for setting a bending angle when the processing mode is set to an arbitrary bending angle in the mode selection switch 36, and a display 38 for displaying the set bending angle. It has.

The numeric keypad 37 may be a dial type angle setting device.

With such a configuration, the control means 35 can be set apart from the bending angle setting means 21 and the bending angle setting operation of the plate material W can be performed by remote control.

On the other hand, when the bending of the plate material W is performed by the relative movement stroke of the bending blades 3.7, even if the stroke of the two blades 3.7 is equal depending on the thickness or material of the plate material W, the bending of the plate material W is performed. The bending angle α changes.

For example, when a thick plate material W is bent with a stroke required to bend the thin plate material W to 90 °, the difference in the thickness and the bending blade 7 contacting the plate material W quickly, Bending angle α becomes tight, 9
Only a bending angle of less than 0 ° can be obtained, and since the bending angle α of the soft material W is tighter than the hard material W, the bending angle α depends on the thickness and the material. It is necessary to correct the relationship between the relative strokes of the two blades 3 and 7.

For this purpose, in the present embodiment, the control means 35 is provided with sheet thickness setting switches 39 to 41 for correcting the correspondence between the bending angle α and the stroke in accordance with the thickness of the sheet material W to be processed. A correcting means which is provided and in which a stroke correction amount corresponding to each of the plate thickness setting switches 39 to 41 is stored in advance (in the present embodiment, the correcting means is the control means 3
5 is incorporated in the CPU 42 provided as the correction circuit 43).

Further, in the present embodiment, a "+" correction switch 44 and a "-" correction switch 45 for fine adjustment are provided, and the moving stroke length is changed for each operation. The length is changed by a predetermined length, for example, the bending angle α is changed by ± 0.5 °.

The number of times of operation is displayed on correction amount indicators 46 and 47 provided on the side of the switches 44 and 45, so that the fine adjustment amount is confirmed. It has become.

Here, a specific correction control by the correction circuit 43 is as follows. When one of the plate thickness setting switches 39 to 41 is operated to select a plate thickness, the correction circuit 43 performs the correction based on the information. Based on the maximum thickness, a correction signal set for each bending mode is read for each selected thickness, and the position setting disk 22 is moved in a predetermined direction based on the correction signal. By performing the fixed rotation, the rotation position of the position setting disk 22 with respect to the selected bending angle α is adjusted, and by performing this adjustment operation for each bending mode, a correction for a change in the plate thickness is performed.

The "±" correction switches 44 and 45
Is performed, the position setting disk 22 is
From the rotation position after the thickness correction has been performed as described above,
Based on the correction amount calculated based on the correction signals of the “±” correction switches 44 and 45, the above-described fine adjustment is performed by being rotated by a predetermined amount in a predetermined direction. By providing the switches 44 and 45, a fine adjustment of 0.5 ° is performed at each bending angle α, and high-precision bending can be performed easily and quickly.

Then, at a predetermined position on the scale plate 27,
The corrected angle is marked, and this graduation plate 27 is
By using the scale plate 27 as a storage medium and replacing the scale plate 27 according to the plate material W to be processed, the above-described plate thickness correction processing and the like can be omitted. Becomes possible.

And / or inputting the movement stroke including the correction amount to the CPU 42 as a new reference value, and rewriting the relationship between the movement stroke and the bending angle α to omit the correction processing in the next cycle. Becomes possible.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, the amount of vertical movement of the blade 7 (that is, the movement stroke) is determined by the driving time of the motor 11 when the rotation speed of the motor 11 is constant, so that the driving of the motor 11 The thickness correction and the fine adjustment are performed by controlling the time, and the output timing of the drive stop signal to the motor 11 is corrected based on the detection signal from the optical sensor 23. Control means 50 is provided;
0, the thickness correction switches 39 to 41, the “±” correction switches 44 and 45, and the displays 46 and 47 are provided.

In this embodiment constructed as above, when the sheet thickness correction switches 39 to 41 are selected and operated to bend, the control means 50 sets the sheet thickness for each sheet thickness. The correction time corresponding to the stroke length to be corrected is read, and the time when the lower edge of the position setting disk 22 is detected by the optical sensor 23 is set as a reference point, and the time is shifted from the reference point by the correction time, A stop signal is output to the motor 11.

Thus, the stop timing of the motor 11 is adjusted, and the movement stroke is adjusted, so that a change in the plate thickness is corrected.

When the actual bending angle after such a thickness correction is different from the desired bending angle, the stop timing of the motor 11 is determined based on the correction signals from the "±" correction switches 44 and 45. That is, the stroke length of the blade 7 is finely adjusted, and the fine adjustment is set by adding or subtracting a predetermined time from the reference time with the correction time set for each plate thickness as a reference time.

In this case, the position setting disk 22 is held at the reference position with respect to the set bending angle.

After the above-described fine adjustment, the movement stroke including the correction amount is input to the CPU 42 as a new reference value, and the relationship between the movement stroke and the bending angle α is rewritten. It is also possible to omit the correction process in the cycle described above.

The shapes, dimensions, and the like of the constituent members shown in each of the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like.

For example, the plate thickness can be corrected by directly adjusting the drive time of the motor 11, and the angle can be finely adjusted by rotating the position setting disk 22, and the plate thickness can be further corrected. It is also possible to adjust the driving time of the motor 11 and adjust the amount of rotation of the position setting disk 22, and to finely adjust the angle by adjusting the amount of rotation of the position setting disk 22.

Further, in the "top mode" in which the plate material W is bent to the maximum angle, when the bottom position of the blade 7 is set in accordance with the thin plate and the "top mode" processing is performed on the thick plate, the fixed blade is processed. When the groove a of the blade 3 is expanded, the shape of the blade 3 changes, and the support interval of the plate material W is widened. It is conceivable that the accuracy is reduced, or that an excessive force acts on the support frame 4 that supports the two blades 3 and 7 to cause deformation of the support frame 4. To prevent this, It is necessary to adjust the lowermost position of the blade 7 according to the plate thickness, and such an adjustment is effective.

In order to prevent inadvertent rotation of the position setting disk 22 after the bending angle is set, the adjusting shaft 2
The brake means and the friction applying means may be provided between the scale 6 and the support plate 24, between the scale plate 27 and the support plate 24, or between the position setting disk 22 and the support plate 24, and the like.

Although it is possible to use another member as the friction applying means, as shown in FIG. 7, the inner races of the two bearings 25 are pressed by the adjusting shaft 26 in the direction of approaching each other, and the outer It is also possible to increase the friction with the race.

[0069]

As described above, according to the first aspect of the present invention,
According to the plate bending machine according to the above, since the setting of the bending angle of the plate is performed by rotating the position setting disk and adjusting the position of the lower end thereof, the mechanism is greatly simplified. be able to.

Most of the factors relating to the positional accuracy of the lower end portion of the position setting disk can be the dimensional accuracy of the member alone, and the accuracy can be easily secured.

Furthermore, since the position of the position setting disk is detected by the optical sensor in a non-contact manner, no external force is applied to the position setting disk at the time of position detection, and the position setting disk can be reliably displaced. In addition to this, the position detection accuracy, that is, the bending accuracy of the plate material can be sufficiently increased.

According to the plate bending machine of the second aspect of the present invention, the position setting accuracy is enhanced by controlling the rotation position of the position setting disk by the servomotor controlled by the control means. The bending accuracy can be further improved, the bending operation can be automated, and the control means, which is an operation part, can be separated from the bending angle setting means, thereby enabling remote control.

According to the plate bending machine of the third aspect of the present invention, the control means sends a drive signal to the servomotor based on a correction amount setting device and a correction signal sent from the correction amount setting device. And a correction circuit for rotating the position setting disk by a predetermined amount in a predetermined direction so that the position setting disk can be positioned quickly and accurately with a bending angle (a desired angle). ) Can be performed reliably and quickly.

According to the plate bending apparatus of the fourth aspect of the present invention, the control means drives the correction mechanism to the drive mechanism based on the correction amount setting device and the correction signal sent from the correction amount setting device. As described in the third aspect, the adjustment of the bending angle in the first aspect can be performed reliably and promptly by being constituted by the correction circuit that sends a signal and changes the driving time of the driving mechanism. .

Further, according to the plate bending machine according to the fifth aspect of the present invention, the control means adjusts the bending angle by correcting the rotational position of the position setting disk whose position is adjusted by the servomotor according to the third aspect. By making a combination with the bending angle adjustment by changing the driving time of the driving mechanism in item 4, relatively large adjustment is performed by adjusting the driving time of the driving mechanism, and finer fine adjustment is performed by the resolution of the servo motor. By performing the rotation position adjustment of the position setting disk using the height of the
The quick and accurate bending angle adjustment can be performed by the quick position adjustment by the drive mechanism and the fine position adjustment by the position setting disk.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is a front view of a main part showing the first embodiment of the present invention.

FIG. 3 is a rear view of a main part showing the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part showing a third embodiment of the present invention.

FIG. 6 is a control block diagram according to a third embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a main part showing a fourth embodiment of the present invention.

FIG. 8 is a rear view showing an example of the structure of the bending machine.

FIG. 9 is a rear view showing an example of the structure of the bending machine and showing an operation state.

FIG. 10 is a side view of a main part for illustrating an example of a structure of a bending machine for explaining an operation thereof.

FIG. 11 is a side view of a main part for illustrating an example of the structure of the bending machine for explaining the operation.

FIG. 12 is a longitudinal sectional view showing a bending angle setting means used in a conventional bending machine.

FIG. 13 is a front view showing a bending angle setting means used in a conventional bending machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bending machine 3 Lower blade (bending blade) 6 Drive mechanism 7 Upper blade (bending blade) 21 Bending angle setting means 22 Position setting disk 22a Perimeter 23 Optical sensor 34 Servo motor 35 Control means 39-41 Plate thickness setting switch 43 Correction circuit 44 + Compensation switch 45-Compensation switch

Claims (5)

(57) [Claims] 1. A pair of bending blades disposed opposite to each other, a drive mechanism for relatively moving the two bending blades in a direction of moving toward and away from each other, and controlling a relative movement stroke of the two bending blades, A bending angle setting means for setting a bending angle of a plate material bent by the bending blade, wherein the bending angle setting means is rotatably mounted on one of the pair of bending blades, and a position setting disk; When the position setting disk is attached to the other bending blade and the position setting disks are opposed to each other with the relative movement of the two bending blades, the position of the peripheral edge is detected, and the relative movement of the two bending blades is stopped. An optical sensor for stopping the relative movement of the two folding blades at a predetermined relative movement stroke, and the peripheral edge of the position setting disk moves in one direction in the rotation direction. By gradually rotating the position setting disk to change the position where the periphery and the optical sensor face each other,
A plate material bending machine characterized in that a relative movement stroke of the both bending blades is adjusted so as to correspond to a set bending angle. 2. The servo system according to claim 1, wherein said bending angle setting means is connected to said position setting disk, and outputs a drive signal to said servo motor to rotate said position setting disk. 2. The sheet bending machine according to claim 1, further comprising control means for controlling rotation to a position where a relative movement stroke corresponding to the set bending angle is obtained. 3. The bending angle setting means is connected to the position setting disk to rotate the position setting disk, and outputs a drive signal to the servo motor to control the position setting disk. Control means for controlling the rotation to a position at which a relative movement stroke corresponding to the set bending angle is obtained, and the control means controls a correction amount setting device and a correction signal sent from the correction amount setting device. 2. The sheet bending machine according to claim 1, further comprising a correction circuit that sends a drive signal to the servomotor to rotate the position setting disk in a predetermined direction by a predetermined amount. 4. The bending angle setting means includes control means for controlling the driving mechanism to a position at which a relative movement stroke corresponding to the bending angle set by the position setting disk is obtained. , A correction amount setting device, and a correction circuit that sends a driving signal to the driving mechanism based on the correction signal transmitted from the correction amount setting device to change the driving time of the driving mechanism. The plate bending machine according to claim 1, wherein: 5. The bending angle setting means is connected to the position setting disk to rotate the position setting disk, and outputs a drive signal to the servo motor to control the position setting disk. While controlling the rotation to a position where a relative movement stroke corresponding to the set bending angle is obtained,
Control means for controlling the drive mechanism to a position at which a relative movement stroke corresponding to the bending angle set by the position setting disk can be obtained, and the control means corrects the position of the position setting disk. A second correction amount setting device for performing position correction of the drive mechanism;
Based on the correction signals sent from the first and second correction amount setting devices, the position setting disk is rotated in a predetermined direction by a predetermined amount, and a drive signal is sent to the drive mechanism to drive the position setting disk. 2. The plate bending machine according to claim 1, further comprising a correction circuit for changing the driving time of the plate.