JPH1177165A - Bender for plate stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bender capable of highly precisely setting a position for a bending position with a simple constitution. SOLUTION: A back ruler 40 on which a plate stock W is abutted and which sets the bending position is arranged at a prescribed interval from bending blade edges 3, 7. The back ruler 40 is composed of a main shaft 41 which is approximately arranged in parallel with bending blade edges 3, 7 and moreover provided so as to rotate, a position setting member 42 which is provided in the outer surface of the main shaft and provided with a position regulating surface 42a on which the plate stock W is abutted, and a locking mechanism 43 which is provided in the main shaft 41, locks the main shaft 41 to the position wherein the position regulating surface of the position setting member 42 is faced to the bending blade edges 3, 7, and freely turns the main shaft in the releasing direction of the plate stock W at the time of bending the plate stock W.

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 As a plate bending machine of this type, the present applicant has already proposed a structure shown in FIGS.

[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 FIG. 15, the lower blade 3 has a groove 3 having a V-shaped cross section opened upward.
a is formed, and the lower part of the upper blade 7 is
Is formed as a tapered surface 7a so as to be inserted into the groove 3a.

[0005] As shown in FIG.
The crankshaft 9 rotatably supported by the support frame 4 and four crank portions 9a provided at predetermined intervals in the longitudinal direction of the crankshaft 9 are rotatably mounted on the crankshaft 9, respectively. A crank arm 10 for connecting the shaft 9 to the lift plate 5 and a motor (not shown) such as an electric motor or a hydraulic motor mounted on the support frame 4 for rotating the crank shaft 9 are provided. .

The bending angle setting means 8 is attached to the support frame 4 and sends an optical sensor 11 for sending a stop signal to the driving mechanism 6. The optical sensor 11 is mounted on the elevating plate 5. A position setting device 12 that is superimposed on the optical sensor 11 as it descends and shields the light detected by the optical sensor 11.
As shown in FIG. 15, an adjustment shaft 13 rotatably mounted on the elevating plate 5, a position setting disk 14 fixed to one end of the adjustment shaft 13, and a rotation position of the position setting disk 14 , And a power transmission mechanism 16 provided between the servo motor 15 and the position setting disk 14.

The bending angle setting means 8 detects the lowering position of the elevating plate 5 and stops the lowering thereof by the detection light of the optical sensor 11 being blocked by the position setting disk 14. Thus, the lowering position of the upper blade 7 with respect to the lower blade 3 is controlled, and the bending angle of the plate material W sandwiched between the two blades 3 and 7 is controlled.

[0008] Further, the position setting disk 14 is shown in FIG.
As shown in the figure, the outer peripheral edge is formed so that the radius gradually decreases as it goes in the circumferential direction. By adjusting the rotational position of the position setting disk 14, the outer peripheral edge and the optical sensor 11 The bending angle of the plate material W is adjusted by adjusting the distance to the detection unit.

On the other hand, as shown in FIGS. 14 and 15, the plate W is brought into contact with the side of the two blades 3 and 7 on the side opposite to the side where the plate W is inserted.
A back ruler 17 for positioning the two blades 3 and 7 with respect to the plate material W to set a bending position of the plate material W is provided.

[0010] The back ruler 17 is provided with the bending blade 3.
A support rod 18 having a rectangular cross section disposed in parallel with (7).
And sliders 19 provided at three locations below the support rod 18 at intervals in the longitudinal direction thereof and movably provided in a direction perpendicular to the elevating surface of the upper blade 7.
And the slider 19 is attached to the support frame 4 and the slider 19 is slidably mounted.
9 and a bending position setting mechanism 21 for synchronously moving the sliders 19
And is constituted by.

As shown in FIG. 15, a pair of guide rods 20 are provided at intervals in the vertical direction for each slider 19, and the sliders 19 are slidably fitted to these guide rods 20. As a result, the bending blades 3 and 7 are maintained in a vertical posture.
To be moved in parallel in the direction of approaching and moving away from.

A feed bolt 2 constituting the bending position setting mechanism 21 is provided between the guide rods 20.
2 is provided so as to be rotatable about its axis and parallel to each of the guide rods 20, and a nut 23 fixed to the slider 19 is screwed to the feed bolt 22. Thus, the feed bolt 22 and the slider 19 are connected.

Since the rotation of the slider 19 around the feed bolt 22 is restrained by the pair of guide rods 20, the forward / reverse rotation of the feed bolt 22 causes the slider 19 to rotate with the guide rod. It can be reciprocated along 20.

Further, bevel gears 24 are attached to the ends of the respective feed bolts 22 as shown in FIG. 14, and bevel gears 25 meshed with the respective bevel gears 24 are mounted on the support frame 4. A drive rod 26 to which is fixed is rotatably mounted, and a drive device (not shown) such as a servomotor is connected to the drive rod 26.

In this embodiment, a bending position setting mechanism 21 is constituted by the feed bolt 22, the nut 23, the bevel gears 24 and 25, the drive rod 26, and the drive device. By rotating the feed bolts 22 synchronously, the sliders 19 are moved integrally, and
The support rod 18 fixed to 9 is moved in parallel with respect to the bending blades 3 and 7.

The upper surface of the support rod 18 is a smooth surface extending along the horizontal direction.
A plurality (six in the illustrated example) of position setting members 27 having an L-shaped cross section are provided at intervals in the length direction of the support rod 18.

Each of the position setting members 27 has one surface orthogonal to the bending blade 3 of the support rod 18.
・ The plate W is positioned so as to protrude from the end on the 7 side.
And the other surface is disposed so as to make surface contact with the upper surface of the support rod 18, so that the position regulating surface 27a raises and lowers the upper blade 7. It is adapted to be held parallel to the plane.

Further, each of the position setting members 27 is turned on the upper surface of the support rod 18 via a hinge 28 having a rotation axis parallel to the longitudinal direction of the support rod 18 at the end of the other surface. In a normal state, as shown by a solid line in FIG. 15, it is held in contact with the support rod 18 by its own weight, and an external force directed upward along the position regulating surface 27a is normally provided. Is actuated so as to be immediately lifted from the support rod 18 as shown by a broken line in FIG.

Next, the operation of the conventional bending machine 1 configured as described above will be described.
By moving the elevating plate 5 to the highest position, the gap between the two blades 3 and 7 is greatly opened as shown in FIG. 15, and the support rod 18 is moved by the rotation of each feed bolt 22. The horizontal distance between the position regulating surface 27a of each position setting member 27 attached to the support rod 18 and the bending blades 3.7 is adjusted according to the distance from the end of the plate material W to the bending position. .

Then, the plate material W is inserted between the bending blades 3 and 7, and its tip is brought into contact with the position regulating surface 27a of the back ruler 16, as shown in FIG. By rotating the crankshaft 9 to be configured, the elevating plate 5 connected to the crankshaft 9 is lowered, and the upper blade 7 attached to the elevating plate 5 is attached to the base 2. The lower blade 3 is lowered toward the lower blade 3, and by continuing such a lowering operation, the upper blade 7 moves the plate W supported by the lower blade 3 substantially at an intermediate portion of the two-point support portion of the lower blade 3. While being pressed, the lower blade 3 is pushed into the groove 3a.

As a result, the plate material W is bent as shown in FIG. 17, and the bending angle is determined by adjusting the amount of rotation of the position setting disk 14 of the bending setting means 8. The distance is set by the distance between the periphery of the position setting disk 14 and the optical sensor 11.

On the other hand, as shown in FIG. 15, the bending position of the plate material W is set by being brought into contact with the position setting member 27, and the plate material W is bent while maintaining the state of contact with the position setting member 27. Therefore, when the leading end of the plate material W is pushed upward, a phenomenon occurs in which the position regulating surface 27a of the position setting member 27 is rubbed.

In particular, when the tip of the plate W is bent at a right angle and the bent portion is brought into surface contact with the position setting member 27, the bent portion of the plate W is Is pressed against the position setting member 27, the above-described phenomenon is likely to occur, but the position setting member 27
Since the upward rotation of the support rod 18 is free, the position setting member 27 is rotated upward following the movement of the plate material W as shown in FIG. Can be

As a result, the plate member W and the position setting member 27
Is prevented, and the plate material W is prevented from being damaged.

[0025]

However, the bending machine 1 still has the following problems to be improved.

That is, in the above-mentioned bending machine 1, in order to increase the positioning accuracy of the plate material W, it is necessary to hold the position regulating surfaces 27a of the plurality of position setting members 27 on the same surface. Since the setting member 27 is rotatably attached to the support rod 18 via the hinge 28, the position of the position regulating surface is likely to vary due to the variation in processing accuracy of the hinge 28. It is a problem.

In order to solve such a problem, it is necessary to increase the processing accuracy of the hinge 28.
This raises manufacturing costs and cannot be an effective solution.

The position setting member 27 of the back ruler 17 is formed so that its position regulating surface 27a is opposed to the vicinity of the upper end of the lower blade 3, so that it is flat as shown in FIG. When bending a flat plate material W,
It is possible to position the bending position by contacting the tip with the position regulating surface 27a. For example, as shown in FIG. 18, the plate member W is moved toward the bending position setting mechanism 21 as shown in FIG. If the portion to be positioned is bent downward in a crank shape, the leading end portion of the plate material W goes under the avoidance of the position setting member 27, and the leading end of the plate material W There is a problem that the support rod 18 is brought into contact with the support rod 18 which is not set as a reference plane.

When such a state occurs, the bending position of the plate material W cannot be set accurately, and the bending process becomes impossible, or the bending procedure is restricted.

When the sheet material W is to be bent by using the space between the folding blades 3 and 7 and the support frame 4 to the maximum without using the back ruler 17, The range of movement of the ruler 17 is limited between the back ruler 17 and the support frame 4, and as described above, the upper end of the position setting member 27 of the back ruler 17 is As shown in FIG. 19, when the plate material W is inserted to the vicinity of the support frame 4 and the plate material W is to be placed on the lower blade 3, as shown in FIG. Part of the W abuts on the upper end of the position setting member 27, and the plate W floats from the lower blade 3 and cannot be accurately placed on the lower blade 3. As a result, at the time of bending, the plate W And slippage occurs at the contact portion of the position setting member 27, It is assumed that the W and the position setting member 27 may be damaged, and the plate material W is likely to be displaced at the time of bending, so that a bending operation at a target position or a scribing operation for marking a processing position is performed. The accuracy of is reduced.

The present invention has been made in view of such conventional problems, and a first object of the present invention is to provide a bending machine capable of setting a bending position with high accuracy and a simple structure. It is a second object of the present invention to provide a sheet material bending machine capable of performing positioning without being influenced by a bent shape of a leading end portion of the plate material and capable of effectively utilizing a space behind a bending blade.

[0032]

According to a first aspect of the present invention, there is provided a plate material bending machine which is disposed to face each other to sandwich the plate material in order to achieve the first object. A pair of bending blades to be bent, a drive mechanism for moving these two bending blades closer to and away from each other, and by controlling this drive mechanism, adjust the relative movement stroke of the two bending blades to set the bending angle of the plate material. Bending angle setting means, and a back ruler which is disposed at a predetermined distance from the bending blade and which is in contact with the plate material inserted between the two bending blades to set a bending position of the plate material. The back ruler is disposed substantially parallel to the bending blade and is provided rotatably, and provided on the outer surface of the main shaft, the plate material is abutted A position setting member provided with a position regulating surface, provided on the main shaft, the main shaft is locked at a position where the position restricting surface of the position setting member is opposed to the bending blade, and at the time of bending the plate material ,
And a locking mechanism for freely rotating in the escape direction of the plate material.

According to a second aspect of the present invention, in order to achieve the above-described first and second objects, in the first aspect of the present invention, the position setting member is arranged so that the position setting member extends in a circumferential direction of the main shaft. While there are multiple at intervals,
The position regulating surface of one of the position setting members is formed so as to face upward from near the upper end of the lower blade,
The position regulating surface of the other position setting member is formed so as to face downward from near the upper end of the lower blade,
Further, the spindle is provided with a position setting member switching mechanism for selectively locking the spindle at a position where one of the plurality of position regulating surfaces faces the bending blade. .

According to a third aspect of the present invention, in the plate bending machine according to the second aspect, the position setting member switching mechanism is rotatably mounted on the main shaft and locked by the locking mechanism. An auxiliary ring, and a clutch provided between the auxiliary ring and the main shaft to elastically and detachably engage the auxiliary ring with the main shaft at a plurality of predetermined locations around the axis. It is characterized by having.

According to a fourth aspect of the present invention, in the plate bending machine according to the third aspect, the position setting member switching mechanism is detachably connected to the main shaft, and the main shaft is connected to the locking mechanism. A motor is provided that rotates in a predetermined direction against a locking force and an engaging force of the clutch.

According to a fifth aspect of the present invention, in the plate bending apparatus according to the second aspect, the position setting member switching mechanism is rotatably mounted on the main shaft, and the engaging member is connected to the main shaft. It is characterized by comprising a driven pulley locked by a stop mechanism, and a motor for rotating the driven pulley and selectively fixing the driven pulley to one of a plurality of predetermined rotation positions.

According to a sixth aspect of the present invention, in the plate bending machine according to the first to fifth aspects, an elastic member for elastically moving the main shaft toward the locking position is provided. It is characterized by.

According to a seventh aspect of the present invention, there is provided a plate material bending machine according to any one of the first to sixth aspects, wherein the back ruler is provided with a bending position setting for bringing the main shaft closer to or away from the bending blade. A mechanism is provided.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the following description, portions common to those in FIGS. 14 to 19 will be denoted by the same reference numerals and description thereof will be simplified.

The folding machine according to the present embodiment is obtained by improving the back ruler 17 shown in FIGS. 14 to 19, and the back ruler according to the present embodiment indicated by reference numeral 40 in FIGS. A position setting member including a main shaft 41 disposed substantially in parallel with the bending blades 3 and 7 and rotatably provided, and a position regulating surface 42a provided on an outer surface of the main shaft 41 and contacting the plate material W. 42, and the main shaft 41. The main shaft 41 is locked at a position where the position regulating surface 42a of the position setting member 42 is opposed to the bending blades 3 and 7, and when the plate material W is bent. And a locking mechanism 43 for freely rotating the plate material W in the escape direction.

To explain these details, the main shaft 41 is formed in a substantially cylindrical or substantially cylindrical shape, and a portion to which the position setting member 42 is attached is formed as shown in FIG. It is cut out to form a flat portion 41a.

Bearings 44 are provided substantially at the center and near both ends of the main shaft 41. The bearings 44 are attached to the slider 19 mounted on the support frame 4 via these bearings 44, and , These bearings 44
The upper end is positioned below the upper end of the lower blade 3.

The position setting member 42 is shown in FIGS.
As shown in the figure, the cross-sectional shape is formed in an L-shape, and is provided at six places with an interval in the length direction of the main shaft 41, and one side of each position setting member 42 is While being brought into contact with the portion 41a in a surface contact state,
In the state where each position setting member 42 is fixed to the main shaft 41 in this manner, the other side forming the position regulating surface 42a is fixed from the side of the main shaft 41 to the flat surface portion 41a by the screw 45. In a state of being protruded toward the bending blades 3.7, the bending blades 3.7 are opposed to the bending blades 3.7.

Therefore, these position setting members 42
The relative positional relationship is uniquely set via the main shaft 41, and mutual positional deviation is suppressed.

In the present embodiment, the locking mechanism 43 is provided with an engaging projection 46 which is provided integrally with the main shaft 41 so as to protrude in the radial direction and the bearing 44 or the slider 19.
And the engaging projection 46 is constituted by a locking projection 47 which is engaged from one direction around the axis of the main shaft 41 (counterclockwise direction in FIG. 2).
By the engagement between the engagement projections 46 and the engagement projections 47,
The rotation of the main shaft 41 in one direction is restrained, the position setting member 42 is positioned above the main shaft 41, and the position regulating surface 42a projects toward the bending blades 3.7, and The position regulating surface 42a is held along the vertical plane.

The main shaft 41 is connected to the engaging projection 4
In the rotation position other than the rotation position in which the locking projection 6 and the locking projection 47 are engaged, the rotation is free. Therefore, as described above, the engagement projection 46 and the locking projection 47 are rotated. Is engaged, when a load is applied to the position setting member 42 to push the position setting member 42 upward, the main shaft 41 is rotated, and the position setting member 42 is rotated. When the member 42 is moved upward and the above-mentioned load is released,
Depending on the weight of the position setting member 42, the engagement protrusion 4
6 is rotated in the reverse direction until it engages with the locking projection 47.

Next, the operation of the bending machine for the plate material W according to the present embodiment thus constructed will be described. The main shaft 41 is attached to the position setting member attached to the main shaft 41 before the start of the bending operation. 42 is
Since the main shaft 41 is mounted so as to protrude outward in the radial direction of the main shaft 41, the main shaft 41 is attached to the position setting member 4.
2 by the rotational moment generated by the weight of
At the same time, the engagement between the engaging projection 46 and the locking projection 47 causes the main shaft 4 to rotate.
1 is restrained, and the position regulating surface 42 a of the position setting member 42 is held at a position facing the lower blade 3.

Then, the bending position setting mechanism 21 is driven to move the main shaft 41 and the bending blades 3.7, that is, the bending blades 3.7 and the position regulating surface 4
After setting the space between the upper blade 7 and the lower blade 3, the plate W is inserted between the upper blade 7 and the lower blade 3, and the leading end thereof is positioned on the position regulating surface of the position setting member 42. 42
a.

In the illustrated example, since the front end of the plate material W is bent at 90 °, the bent portion is brought into surface contact with the position regulating surface 42a of the position setting member.

Next, the plate member W is bent at a predetermined angle by driving the drive mechanism 6 to lower the upper blade 7 toward the lower blade 3 to the position set by the bending angle setting means 8.

At the time of such a bending operation, the contact portion of the plate material W with the position setting member 42, that is, the tip portion is pushed upward in FIG. Although a load is applied to push up the main shaft 41, the main shaft 41 is free to rotate in the above-described direction, so that the main shaft 41 is rotated clockwise in FIG. At the same time, the position setting member 42 attached to the main shaft 41 is moved upward following the movement of the leading end of the plate material W.

As a result, the plate material W does not rub against the position setting member 42 when the plate material W is bent, and the plate material W is prevented from being damaged.

At this time, the position setting members 42 are directly fixed to the single main shaft 41, and the position setting members 42
There is no play between the shaft 41 and the main shaft 41, and the relative positional relationship is kept constant.
As a result, the stop position of the plate material W brought into contact with the position setting member 42, that is, the bending position, is set with high precision.

Further, since the position setting members 42 are directly fixed to the main shaft 41, the structure is simple, and the assembling work is greatly simplified. In addition, highly accurate positioning of the bending position is ensured, and damage to the plate material W at the time of bending is reliably prevented.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In this embodiment, as in the first embodiment, the back ruler 17 of the folding machine 1 shown in FIGS. 14 to 19 is improved. 4 shows a back ruler according to the embodiment.

The main shaft 51 of the back ruler 50 has two sets of position setting members 5 spaced apart in the circumferential direction of the main shaft 51.
2 and 53 are provided. When the position regulating surface 52a of the first position setting member 52 is opposed to the lower blade 3, the position regulating surface 52a is opposed from the upper end portion of the lower blade 3 upward. In a state where the position regulating surface 53a of the second position setting means 53 is opposed to the lower blade 3, the lower surface 3 is opposed to the lower blade 3 from near the upper end thereof. And a locking mechanism 54 for freely rotating the main shaft 51 from a predetermined locking position in the escape direction of the plate material W when the plate material W is bent. ing.

Next, the details will be described. A pair of flat portions 51a and 51b are formed on the side surface of the main shaft 51 so as to be parallel to each other. Each of the position setting members 52 and 53 is attached to the main shaft 51. The main shaft 51 is provided at the intermediate portion and near both ends in the longitudinal direction of the main shaft 51 via the bearing 44 similarly to the above-described embodiment. Connected to

The first and second position setting members 52.
As shown in FIG. 4, 53 are provided at six locations at intervals in the longitudinal direction of the main shaft 51, and all have an L-shaped cross section as shown in FIG. One side is fixed to the flat portions 51a and 51b of the main shaft 51 by screws 55, and the other side is the position regulating surfaces 52a and 52b.

The position restricting surface 52a of the first position setting member 52 is positioned so as to protrude from the side of the main shaft 51, and when the position restricting surface 52a is opposed to the lower blade 3, The blade 3 is formed so as to be opposed from the upper end to the upper part thereof, and the position regulating surface 53 a of the second position setting member 53 is
The upper end of the lower blade 3 in a state in which the lower blade 3 faces the lower blade 3 while protruding from the side of the first position setting member 52 to the opposite side to the position regulating surface 52a. Is formed so as to face from below to below, so that it is positioned so as to cover the side portion of the main shaft 51 and the first position setting member 5.
The second position regulating surface 52a and the position regulating surface 53a of the second position setting member 53 are parallel to each other.

In the present embodiment, the locking mechanism 54 is provided near the bearing 44 that supports an intermediate portion of the main shaft 51, as shown in FIG.

More specifically, as shown in FIG. 6, an auxiliary ring 56 rotatably supported by the bearing 44 is relatively rotatably fitted on the main shaft 51. 56 are provided with engaging projections 5 protruding outward.
The auxiliary ring 56 is provided on the bearing 44 by engaging the engagement protrusion 58 in one direction around the main shaft 51 (counterclockwise in the illustrated example). A locking projection 59 for regulating the rotation position in the direction around the axis is provided, and the engaging projection 58 and the locking projection 59 constitute the locking mechanism 54 according to the present embodiment. .

On the other hand, between the main shaft 51 and the auxiliary ring 56, these are locked at two predetermined positions around the axis, and the load acting to rotate them relatively exceeds a predetermined value. In this case, a clutch 57 is provided so as to allow relative rotation between the two.
Between the bearing 8 and the bearing 44, there is provided a resilient member 60 for repelling the auxiliary ring 56 in a direction in which the engagement projection 58 and the engagement projection 59 are engaged.

The clutch 57 is connected to the main shaft 51.
A guide hole 61 formed at a predetermined depth from the side surface of the guide hole toward the inside in the radial direction; an engagement ball 62 movably mounted in the guide hole 61 along the length direction thereof; A compression spring 63 mounted in the guide hole 61 and resiliently engaging the engagement ball 62 toward the outside of the guide hole 61.
And a substantially cone formed on the inner wall surface of the auxiliary ring 56 so that a part of the engagement ball 62 is fitted when the auxiliary ring 56 and the main shaft 51 are relatively rotated to a predetermined position. And a concave portion 64 in the shape of a circle.

When the auxiliary ring 56 and the main shaft 51 are relatively rotated to a predetermined position, the guide hole 61 and the concave portion 64 of the clutch 57 are aligned with each other. Is engaged by the compression spring 63,
A part of the engaging ball 62 is projected from the opening end of the guide hole 61 and is engaged with the concave portion 64, thereby restricting the relative rotation of the auxiliary ring 56 and the main shaft 51 around the axis. To rotate the two together, and
When a large relative rotational force acts between the shaft 6 and the main shaft 51, the engagement ball 62 is pushed into the guide hole 61 along the inclined surface of the recess 64, and the engagement ball 62 engages with the recess 64. Is released, the main shaft 51 and the auxiliary ring 5 are released.
6 is released to allow relative rotation between them.

Further, the guide hole 61, the engagement ball 62,
And, the compression springs 63 are provided at two places on the main shaft 51 at an interval of 180 ° around the axis thereof.
When one engagement ball 62 is selectively fitted into the concave portion 64, the main shaft 51 and the auxiliary ring 56
The two parts are mutually locked at a predetermined relative rotation position.

Then, the main shaft 5 is
1 and the auxiliary ring 56 are engaged with each other, the relative rotation thereof is restrained, and the main body 51 is mounted on the main shaft 51 in a state where the engagement projection 58 and the engagement projection 59 are engaged. One position regulating surface 52 of the position setting members 52 and 53
a (53a) is opposed to the bending blades 3.7.

On the other hand, a servo motor 66 is attached to the spindle 51 and the slider 19, and the servo motor 66 is rotated by the spindle 51.
In this embodiment, the servo motor 66, the rotation transmitting means 67, the auxiliary ring 56, and the clutch 57 are provided.
With this, the position setting member switching mechanism 6 that switches the position setting members 52 and 53 facing the bending blades 3 and 7
5 are configured.

The position setting member switching mechanism 65
The main shaft 51 and the auxiliary ring 5 are
In a state where the relative rotation with respect to 6 is restricted and the engagement projection 58 and the engagement projection 59 are engaged with each other, a predetermined rotational force is applied to the main shaft 51 to cause the main shaft 51 to rotate. The engagement sphere 62 and the recess 64 are disengaged by rotating in a direction in which the engagement projection 58 and the engagement projection 59 are engaged, that is, counterclockwise in FIG. Is rotated to selectively engage one of the pair of engagement balls 62 with the concave portion 64, whereby the position of one of the two sets of position setting members 52 and 53 attached to the main shaft 51 is adjusted. The restricting surfaces 52a and 53a can be selectively set to the bending blade 3.
7, and the servo motor 66 has a built-in clutch mechanism for free rotation of the main shaft 51 as necessary.

Further, in the present embodiment, as described above, the resilient member 60 which resiliently pushes the auxiliary ring 56 in the direction in which the engagement projection 58 and the engagement projection 59 are engaged.
The resilient force of the resilient member 60 rotates the main shaft 51, which is freely rotatable, in one direction, and moves the engaging projection 58 to the locking projection 59. The clutch 5 has a small elastic force enough to be engaged.
7 is set to be smaller than the engagement force between the engagement ball 62 and the recess 64.

Therefore, the engagement ball 62 and the recess 6
In a state in which engagement with the auxiliary ring 5 has been performed,
6, when a load is applied to rotate the engaging projection 58 in a direction away from the locking projection 59, the main shaft is opposed to the elastic force of the elastic member 60 as shown in FIG. 51
And the auxiliary ring 56 are easily and integrally rotated.

Next, the operation of the plate bending machine according to this embodiment will be described.

First, a case where the linear plate material W is bent at a predetermined position from the front end will be described.
In a predetermined position, and the clutch 57
In a connected state, as shown in FIGS.
Of the main shaft 51 by the servo motor 66 of the position setting member switching mechanism 65 is released.

Thus, the first position setting member 5
2 is held with its position regulating surface 52a facing the lower blade 3.

Next, the slider 19, that is, the main shaft 51, is moved by the bending position setting mechanism 21, and the distance between the first position setting member 52 and the lower blade 3 is adjusted in accordance with the intended bending position. .

Then, as shown in FIG. 5, the plate material W is inserted between the two folding blades 3 and 7 in the opened state, and the leading end thereof is brought into contact with the first position setting member 52. After the positioning, the upper blade 7 is lowered by the driving mechanism 6 and the upper blade 7 and the lower blade 3 are engaged with each other,
As shown in FIG. 8, the plate material W is bent at a predetermined angle, and the bending angle is set by the bending angle setting means 8 with respect to the upper blade 7 with respect to the lower blade 3.
Is determined by the relative lowering position of

At the time of such a bending operation, the leading end of the plate material W is moved so as to be pushed upward, and at this time, the first position setting member which is brought into contact with the plate material W by the plate material W Similarly, a load that pushes upward is applied to 52. However, since the rotation of the main shaft 51 is restricted only by the weak elastic force of the elastic member 60, the main shaft 51 is FIG.
As shown in FIG. 7, the rotation is caused by the above-described load, and the first position setting member 52 is moved upward as in the first embodiment.

Thus, when the plate material W is bent, damage to the plate material W due to friction between the plate material W and the first position setting member 52 is prevented.

Also in this embodiment, since the plurality of first position setting members 52 are directly fixed to the main shaft 51, respectively, the displacement between the plurality of first position setting members 52 can be reduced. Because the main shaft 51 is highly accurately positioned by the bearings 44, the bending position of the plate material W to be brought into contact with the first position setting members 52 and positioned is accurately controlled. Is set.

When the distal end of the plate material W is separated from the first position setting member 52 by such a bending operation, the auxiliary ring 56 is moved by the resilient force of the resilient member 60 so that Until the engagement between the projection 58 and the locking projection 59 is performed, the direction opposite to the above-described direction, that is,
8, the main shaft 51 connected to the auxiliary ring 56 via a clutch 57 is also rotated in the same manner as the first position setting member. Along with 52, it is returned to the initial position shown in FIG.

Next, as shown in FIG. 11, a description will be given of a case where the plate material W whose front end is bent downward in the shape of a crank is bent. First, the internal clutch of the position setting member switching mechanism 65 is operated. After connecting the servo motor 66 and the main shaft 51 via the rotation transmitting means 67,
The servo motor 66 is started to rotate the main shaft 51 in a counterclockwise direction as shown by an arrow in FIG.

At this time, the rotation of the auxiliary ring 56 in the rotation direction by the position setting member switching mechanism 65 is restricted by the engagement between the engagement projection 58 and the engagement projection 59. From the position setting member switching mechanism 65
By applying a rotating force to the main shaft 51 larger than the engaging force of the clutch 57,
7 is released, and the main shaft 51 is rotated relative to the auxiliary ring 56 in the stopped state.

The rotation of the main shaft 51 is rotated until the other engagement ball 62 of the clutch 57 is fitted into the recess 64 of the auxiliary ring 56 in the stopped state, and the clutch 57 is connected. Thereafter, the operation of the position setting member switching mechanism 65 is stopped, and the connection of the internal clutch of the position setting member switching mechanism 65 is released.

By such an operation, after the main shaft 51 is rotated by 180 ° relative to the auxiliary ring 56 in a stopped state, the main shaft 51 is locked to the auxiliary ring 56 via the clutch 57, and As shown in FIG. 11, a position regulating surface 53 a of a second position setting member 53 provided on the main shaft 51 is held vertically along the vertical direction and opposed to the lower blade 3.

The position regulating surface 53a of the second position setting member 53 opposed to the lower blade 3 is located downward so as to cover the side surface of the main shaft 51. When the plate material W whose part is bent downward in a crank shape is inserted between both the bending blades 3 and 7,
As shown in FIG.
3a.

Therefore, the tip of the plate material W is brought into contact with the reference plane for setting the bending position, and the accurate bending position for the plate material W is set.
It is suppressed that bending in the next step is restricted by the bending mode performed in advance.

When the plate W is bent by lowering the upper blade 7, the position regulating surface 53 a of the second position setting member 53 is positioned so as to cover the side surface of the main shaft 51. Therefore, when the second position setting member 53 is moved upward together with the leading end of the plate W, the movement trajectory is such that the leading end of the plate W approaches the second position setting member 53.

Here, depending on the contact position between the tip of the plate material W and the second position setting member 53, the tip of the plate material W is moved upward as in the above-described bending operations. At the same time, since the rotation of the main shaft 51 is restricted only by the weak elastic force of the elastic member 60, the main shaft 51 is rotated with the movement of the front end of the plate material W, and the second main shaft 51 is rotated. The position setting member 53 is also moved upward similarly, and as a result, the rubbing between the plate material W and the second position setting member 53 is prevented, and the plate material W is prevented from being damaged.

When the contact position between the tip of the plate material W and the second position setting member 53 is displaced to some extent below the above-mentioned position, the tip of the plate material W moves to the second position setting member 53. In some cases, it is difficult to rotate the main shaft 51 for the escape described above.

In this case, the plate material W is displaced and the bent position is displaced, or an excessive force acts on the plate material W to damage the plate material W and the second position setting member 53. Is expected to give
Simultaneously with the start of the bending of the plate material W, the bending position setting mechanism 21 is driven to move the main shaft 51, that is, the second position setting member 53, in a direction to slightly separate from the lower blade 3. Required.

In the state where the second position setting member 53 is opposed to the lower blade 3 as described above, the second position setting member 53 is located below the main shaft 51 and the bearing 44. 12 and the upper ends of the main shaft 51 and the bearing 44 are positioned lower than the upper end of the lower blade 3, so that as shown in FIG. The plate member W is accurately placed on the lower blade 3 without contacting the back ruler 50 even when the plate member W is installed so as to pass over the lower blade 3.

Therefore, it is possible to perform a bending operation using the entire space between the bending blades 3 and 7 and the support frame 4 located behind the bending blades 3, 7, and the range of use can be greatly expanded.

On the other hand, in this embodiment, by using the servo motor 66 for the position setting member switching means 65, the switching of the position setting members 52 and 53 is electrically performed, so that the bending operation can be automated. It becomes possible.

Further, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, the position setting member switching mechanism is modified. The position setting member switching mechanism indicated by reference numeral 70 in FIG. 13 is a driven pulley 71 rotatably mounted on the main shaft 51. A servo motor 73 having a drive pulley 72 disposed at a predetermined distance from the driven pulley 71; and a timing belt 74 wound between the drive pulley 72 and the driven pulley 71.
And is constituted by.

The driven pulley 71 is provided with a locking projection 75 protruding along the direction of the rotation axis, and the main shaft 51 is provided with an engaging projection 76 protruding along the radial direction. The main shaft 51 and the driven pulley 71 are formed by the locking projections 75 and the engagement projections 76.
A locking mechanism 78 for restraining relative rotation of the engaging projection 76 with the driven pulley 71 in a predetermined direction (counterclockwise in the illustrated example). A resilient member 77 for repelling the projection 75 in the engaging direction is interposed.

Further, the servo motor 73 constituting the position setting member switching means 70 has a built-in electromagnetic brake for restricting its rotation.

In the position setting member switching mechanism 70 according to the present embodiment thus configured, the main shaft 51 is rotated by rotating the driven pulley 71 by the servo motor 73, and the main shaft 51 is rotated. One of the position setting members 52 and 53 attached to the lower blade 3
(In the illustrated example, the first position setting member 53 is opposed), and in this state, the servo motor 73
The first position setting member 53 is locked at a position facing the lower blade 3 by restraining the rotation of the main shaft 51 by a built-in electromagnetic brake, and the main shaft 51 is restarted by restarting the servo motor 73. Is rotated by 180 °, so that the second position setting member 52 is locked in a state of facing the lower blade 3.

During the switching operation of the position setting members 52 and 53, the locking mechanism 78 is held in the locked state by the resilient member 77, and the relative rotation between the main shaft 51 and the driven pulley 71 is restricted. Therefore, the main shaft 51 is integrally rotated with the rotation of the driven pulley 71.

However, since the resilient force of the resilient member 77 is set weak, the driven pulley 71
Is rotated in a direction (counterclockwise in FIG. 13) in which the contact of the locking mechanism 78 is released, the inertial force at the time of initial movement causes the engaging projection 76 and the locking projection 7 of the locking mechanism 78 to rotate.
It is assumed that a so-called chattering phenomenon occurs in which the engaging projections 76 and the locking projections 75 are re-contacted by the resilient members 77 during the rotation.

When such a chattering phenomenon occurs, a noise is generated due to an impact at the time of re-contact between the engagement projection 76 and the engagement projection 75. The driven pulley 7 is moved in a direction (clockwise direction in FIG. 13) for engaging with the projection 75.
It is desirable to rotate 1.

When the position setting members 52 and 53 are opposed to the lower blade 3, the rotation of the driven pulley 71 is restricted and the rotation of the driven pulley 71 is restricted as described above. Since the elastic force of the constrained elastic member 77 is set to be weak, when the plate material W is bent, the main shaft 51 is rotated so as to smoothly follow the escape direction.

As a result, also in this embodiment, the same operation and effect as in the second embodiment can be obtained.

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

For example, in the embodiment shown in FIG. 2, a rotational moment is applied to the main shaft 41 by the weight of the position setting member 42 attached to the main shaft 41, and the main shaft 41 is returned to the initial position by the rotational moment. However, in order to ensure this returning operation, the main shaft 4 is resiliently provided by using a resilient member 60 as shown in FIG.
It is also possible to give a restoring force to 1.

In each of the above embodiments, the second
By using the position setting member switching mechanism 65 shown in the embodiment, the rotational positions of the main shafts 41 and 51 and the movement of the position setting members 42, 52 and 53 in the escape direction during the bending operation are electrically performed. It is also possible to make it.

Further, the example in which the bending angle setting means 8 is configured using a non-contact type position detector has been described, but it is also possible to use a contact type position detector such as a limit switch.

Further, the position setting member switching mechanism 65 shown in the second embodiment may be omitted, and the position setting members 52 and 53 may be switched manually.

On the other hand, in each of the above embodiments, the main shafts 41 and 51 are supported in the axial direction by pillow bearings or the like at the intermediate portion in the longitudinal direction, so that the main shafts 41 and 51 undergo thermal expansion and contraction. In this case, the distortion is released to both ends of the main shafts 41 and 51, and deformation such as bending of the main shafts 41 and 51 is prevented.

[0110]

As described above, according to the first aspect of the present invention,
According to the plate bending machine according to the related art, since the back ruler is configured, and the position setting member that makes contact with the leading end of the plate is positioned directly on the rotatably provided main shaft, In the case where a plurality of the position setting members are provided, mutual displacement of the position setting members after attachment can be prevented, accurate position setting of the bending position can be performed, and the rotation of the main shaft allows the plate material to be formed. The relief operation of the position setting member at the time of bending can be reliably performed, and damage to the plate member and the position setting member can be prevented.

Further, since the position setting member is directly fixed to the main shaft, the structure is simple and the assembling work is simple, so that the manufacturing cost can be reduced.

According to the plate bending machine of the second aspect of the present invention, in the first aspect, a plurality of position setting members are provided at intervals in a circumferential direction of the main shaft, and a position regulating surface of one of the position setting members is provided. In a state facing the lower blade,
The lower blade is formed so as to face upward from the vicinity of the upper end thereof, and in the state where the position regulating surface of the other position setting means faces the lower blade, near the upper end of the lower blade. And a position setting member for selectively locking the main shaft to a position at which one of the plurality of position regulating surfaces faces the bending blade. By providing a switching mechanism,
The position regulating surface against which the plate is brought into contact is enlarged in the vertical direction of the bending blade, whereby even if the tip of the plate is bent, the position regulation surface and the position of the plate are restricted. The contact with the surface is made possible, whereby the next step of bending can be performed without being affected by the preceding bending, and the range in which bending can be performed can be greatly expanded. .

According to the plate bending machine of the third aspect of the present invention, in the second aspect, the position setting member switching mechanism is rotatably mounted on the main shaft and is engaged by the locking mechanism. An auxiliary ring to be stopped, a clutch provided between the auxiliary ring and the main shaft, and elastically and detachably engaging the auxiliary ring and the main shaft at a plurality of predetermined locations around the axis. With this configuration, the switching of the plurality of position setting members can be performed smoothly, and the switching position can be reliably maintained, whereby the continuous bending of the plate material can be performed smoothly. it can.

According to the plate bending machine of the fourth aspect of the present invention, in the third aspect, the position setting member switching mechanism is removably connected to the main shaft, and the main shaft is connected to the locking mechanism. By providing a motor that rotates in a predetermined direction against the engaging force of the clutch and the engaging force of the clutch, the position setting member can be automatically switched, and application to automatic driving is facilitated. .

According to the plate bending machine of claim 5 of the present invention, in claim 2, the position setting member switching mechanism is rotatably mounted on the main shaft, and the position setting member switching mechanism is rotatable with respect to the main shaft. According to the fourth aspect of the present invention, the driven pulley is locked by the locking mechanism, and the driven pulley is rotated, and the motor is selectively fixed to one of a plurality of predetermined rotation positions. By omitting the clutch in addition to the function and effect, the overall configuration can be simplified.

Further, according to the plate bending machine according to the sixth aspect of the present invention, in the first to fifth aspects,
The main shaft is provided with a resilient member that repels the main shaft toward a locking position where the position regulating surface of the position setting member faces the bending blade, whereby the main shaft is turned in a predetermined direction from the locking position during a bending operation. The moved main spindle can be reliably returned to the locking position by the resilient member,
The transition to the bending operation in the next step can be made smooth.

Further, according to the plate bending machine according to the seventh aspect of the present invention, in the first to sixth aspects, the distance between the back ruler and the bending blade is adjusted by a bending position setting mechanism. The bending position of the plate material can be easily adjusted.

[Brief description of the drawings]

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

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

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

FIG. 4 is a rear 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 second embodiment of the present invention.

FIG. 6 shows a second embodiment of the present invention, and is a detailed view of a locking mechanism.

FIG. 7 shows a second embodiment of the present invention, and is a detailed view of a locking mechanism.

FIG. 8 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 9 shows a second embodiment of the present invention, and is a detailed view of a locking mechanism.

FIG. 10 shows a second embodiment of the present invention, and is a detailed view of a locking mechanism.

FIG. 11 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 13 shows a third embodiment of the present invention, and is a detailed view of a locking mechanism.

FIG. 14 is a rear view showing a plate bending machine according to the earlier proposal of the present applicant.

FIG. 15 is a longitudinal sectional view of a main part of a plate bending machine according to the earlier proposal of the present applicant.

FIG. 16 is a rear view showing the bending angle setting means of the plate bending machine according to the earlier proposal of the present applicant.

FIG. 17 is a longitudinal sectional view of a main part of a plate bending machine according to the earlier proposal of the present applicant.

FIG. 18 is a longitudinal sectional view of a main part of a plate bending machine according to the earlier proposal of the present applicant.

FIG. 19 is a longitudinal sectional view of a main part of a plate bending machine according to the earlier proposal of the present applicant.

[Explanation of symbols]

 Reference Signs List 3 Lower blade 3a Groove 4 Support frame 5 Lifting mechanism 6 Driving mechanism 7 Upper blade 8 Bending angle setting means 9 Crank shaft 10 Crank arm 11 Optical sensor 12 Position setting machine 13 Adjusting shaft 14 Position setting disk 15 Servo motor 16 Drive mechanism 19 Slider Reference Signs List 20 guide rod 21 bending position setting mechanism 22 feed bolt 23 nut 24 25 bevel gear 26 drive rod 40 50 back ruler 41 51 main shaft 42 position setting member 42a position regulating surface 43 locking mechanism 52 first position setting member 53 Second position setting member 52a / 53a Position regulating surface 54/78 Locking mechanism 56 Auxiliary ring 57 Clutch 58/76 Engagement projection 59/75 Engagement projection 60/77 Resilient member 62 Engagement ball 63 Compression spring 64 Recess 65/70 Position setting member switching mechanism 66 Servo motor 6 7 Rotation transmitting means 71 Driven pulley (position setting member switching mechanism) 72 Drive pulley (position setting member switching mechanism) 73 Servo motor (position setting member switching mechanism)

Claims (7)

[Claims] A pair of bending blades disposed opposite to each other and configured to bend the plate material by sandwiching the plate material, and a drive mechanism for moving the both bending blades closer to and away from each other;
By controlling the driving mechanism, a bending angle setting means for adjusting a relative movement stroke of the both bending blades to set a bending angle of the plate material, and a bending angle setting means disposed at a predetermined interval from the bending blade, A back ruler for setting a bending position of the plate material by being brought into contact with the plate material inserted between the bending blades, wherein the back ruler is disposed substantially parallel to the bending blade and rotatable. A spindle provided, and an outer surface of the spindle,
A position setting member provided with a position regulating surface with which the plate member is brought into contact, and provided on the main shaft, and the main shaft is locked at a position where the position regulating surface of the position setting member is opposed to the bending blade. And a locking mechanism for freely rotating the plate material in the escape direction when the plate material is bent. 2. A plurality of the position setting members are provided at intervals in a circumferential direction of the main shaft, and a position regulating surface of one of the position setting members extends upward from near an upper end portion of the lower blade. And the position regulating surface of the other position setting member is formed so as to face downward from near the upper end portion of the lower blade, and the main shaft has the main shaft. 2. The sheet bending machine according to claim 1, further comprising a position setting member switching mechanism for selectively locking one of the plurality of position regulating surfaces at a position facing the bending blade. . 3. An auxiliary ring rotatably mounted on the main shaft and locked by the locking mechanism, and the position setting member switching mechanism is provided between the auxiliary ring and the main shaft. 3. The plate bending machine according to claim 2, further comprising a clutch for elastically and detachably engaging the auxiliary ring and the main shaft at a plurality of predetermined locations around the axis. . 4. The position setting member switching mechanism is detachably connected to the main shaft, and rotates the main shaft in a predetermined direction against a locking force of the locking mechanism and an engaging force of the clutch. The plate bending machine according to claim 3, further comprising a motor. 5. A driven pulley, wherein the position setting member switching mechanism is rotatably mounted on the main shaft and is locked by the locking mechanism with respect to the main shaft, and rotates the driven pulley. The plate bending machine according to claim 2, further comprising: a motor selectively fixed to one of a plurality of predetermined rotational positions. 6. A resilient member for repelling the main shaft toward the locking position is provided.
A plate bending machine according to any one of claims 1 to 5. 7. The bending ruler according to claim 1, wherein the back ruler is provided with a bending position setting mechanism for moving the main shaft toward and away from the bending blade. Plate bending machine.