JP3178886B2 - Press brake and light beam type safety device used for press brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press brake and a light beam type safety device used for the press brake.

[0002]

2. Description of the Related Art Conventionally, a press brake provided with a light beam type safety device which uses a light beam to ensure worker safety is provided at a position slightly away from a bending line in which a punch and a die cooperate with each other. A plurality of light emitters are arranged on one end side in parallel with the bending line, and a light receiver such as a light emitting diode for receiving a light beam from the light emitter is arranged side by side on the other end side at a position corresponding to the light emitter. A part of the worker's body enters the stripes of the emitted light, and the operation of the press brake is stopped when the light receiving side is blocked.

However, in the above-described conventional configuration, the interval between the light beams from the light projectors arranged in parallel to the bending line is, for example, about 20 mm. At the position where the light receiver spreads, it spreads to about 50 mm, so that interference may occur at the position of the adjacent light receiving device, causing a malfunction. Therefore, in the conventional apparatus, only one pair of light emission and light reception is made valid and the others are made invalid, and mutual interference is prevented by sequentially switching this one-to-one correspondence.

In addition, since there is a safe distance, that is, a predetermined distance, between the bending line and the light emitter and the light receiver, if the upper mold and the lower mold are approached, they are immediately stopped when the hand is reached. However, when the material is small, there is a problem that the light is interrupted by the operator's hand before the light comes into contact with the back gauge, because the light is blocked by the operator.

For this reason, a method of stopping the operation only in the case of two-axis light shielding has been adopted. However, if the work is already partially formed three-dimensionally so as to be formed in a box shape, the aforementioned method is required. There was also a problem that the two-axis light blocking state was set and the press brake was not operated.

[0005] In order to solve the above problems, it has been attempted to install the optical axis close to the mold. However, since the light beam is thick, reflection may occur and malfunction may occur.
It was impossible to bring the optical axis close to the mold.

The present invention has been made in view of the above circumstances, and an object of the present invention is to use three-dimensional light by using light whose beam of light does not increase and setting the optical axis on a bending line or slightly behind the bending line. The present invention aims to provide a press brake having a light beam type safety device and a light beam type safety device which can be operated without stopping even on a workpiece which has been subjected to primary processing and which is easy to use in order to maintain the safety of workers. Things.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the invention according to claim 1 is an invention in which an upper table provided with a punch at a lower portion and a die detachable in the left-right direction are provided. A lower table provided with: an upper table or one of the lower tables is provided so as to be vertically movable; and a projector and a light receiver are provided, and when the laser beam emitted from the projector is shielded, the table is moved up and down. In the press brake provided with a light beam type safety device configured to stop the laser beam, the laser beam is located at a position above a groove formed on the upper surface of the die and in a range where light is shielded by relative lowering of the punch. And the light emitter and the light receiver are provided so as to be finely adjustable in the up-down direction and the front-rear direction, and open a side of a die supporting member that supports the die. It is obtained by movable in the longitudinal direction.

According to a second aspect of the present invention, there is provided a light beam type safety device for a press brake having a pair of a light emitter and a light receiver disposed on both sides of a die supporting member for detachably supporting a die in a press brake in the left-right direction. In the apparatus, the light emitter and the light receiver are provided so as to be finely adjustable in a vertical direction and a front-rear direction with respect to a mounting member to a press brake, and can be moved in a front-rear direction to open a side of the die supporting member. It is what was constituted.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIG. 8, the press brake 1 has a fixed apron 3 provided above and a movable apron 5 provided below the fixed apron 3. A punch 7 is attached to a lower end surface of the fixed apron 3, and a die 9 for bending a work in cooperation with the punch 7 is detachably attached to a left and right direction on an upper end surface of the movable apron 5. is there.

The fixed apron 3 is fixed to an upper portion of a C-shaped frame 11 erected on both ends of the press brake 1, and the movable apron 5 is supported by a bed 13 provided at a lower portion of the frame 11. It is operated in the vertical direction by an elevating device (not shown) provided in the bed 13. Thus, the die 9 on which the work is placed is lifted to the punch 7 side, and the die 9 is pressed against the punch 7 to bend the work. In the figure, reference numeral 15 denotes an operation box, and the press brake 1 is operated by a switch provided in the operation box 15.

The press brake 1 is provided with a light beam type safety device 17 shown in FIGS. The light beam type safety device 17 includes a light projector 1 attached to both ends of either the fixed apron 3 or the movable apron 5.
9 and a light receiver 21. In this embodiment, the light
9 and a light receiver 21 are provided on both sides of the movable apron 5. The projector 19 is configured to project a laser beam.

Each of the light projector 19 and the light receiver 21 has a front-rear fine adjustment device 23 for finely adjusting the light projector 19 and the light receiver 21 in the front-rear direction, and a vertical fine adjustment device for fine-adjustment in the vertical direction. Adjusting device 25 and mounting position changing device 27 for temporarily changing the mounting position at the time of mold replacement
Etc. are provided. In the following, since each of the above devices is provided in the light projector 19 and the light receiver 21,
The nine side will be described with reference to FIGS.

A fixing plate 29 as a mounting member for mounting the projector 19 on the press brake has a projection 31 on one side.
The die 9 is located near the protrusion 31.
The fixing plate 29 has a notch 37 having a semicircular tip at the center thereof. The bracket 33 is screwed to the mounting hole 35 and the notch 37 at two places.

An attachment member 39 is screwed and fixed to the projecting portion 31 of the fixing plate 29 by a bolt 41. The mounting member 39 is an L-shaped member when viewed from above, and the opposite end screwed and fixed to the protruding portion 31 is bent in a right angle direction and protrudes toward the fixing plate 29. Above the mounting member 39, a block-shaped stopper mounting member 45 provided with an adjustable stopper member 43 such as an adjustment bolt is provided. This mounting member 39
A shaft hole 47 in the vertical direction is formed in the tip of the other side.

On the upper part of the mounting member 39 having the shaft hole 47 formed therein, an arm member 51 having a shaft portion 49 which is slidably fitted in the shaft hole 47 is provided so as to be horizontally rotatable. The arm member 51 is a flat rectangular member, and the shaft portion 49 suspended from the lower side of the arm member 51 is formed in a cylindrical shape. An embra knob 55 which is inserted from the lower surface side of the mounting member 39 and screwed thereto is mounted on the screw portion 53. By tightening the embra knob 53, the arm member 51 is fixed to the mounting member 39, and by loosening the embra knob 55, the arm member 51 becomes rotatable via the shaft 49.

One side of the arm member 51, which can be fixed and rotated by tightening and loosening the embra knob 55,
By contacting the tip of the stopper member 43, the directionality of the arm member 51 is determined. A fine screw is provided at one end of the stopper member 43, and the fine screw portion protrudes outward from the stopper mounting member 45, and a locking nut 57 is provided. On the other hand, the stopper mounting member 45 and the arm member 5
A spring 59 is stretched between the arm member 51 and the arm member 51 so that the arm member 51 is constantly urged to abut the stopper member 43. The horizontal rotation of the light projector 19 can be finely adjusted by the spring 59 and the stopper member 43, and the optical axis of the light projector 21 can be aligned. A ball-in set screw 61 is inserted into the upper portion of the shaft portion 49 from the rear side of the arm member 51, and is formed so as to prevent the shaft portion 49 from swinging as shown in FIG.

A screw shaft 63 is provided at a position away from the shaft portion 49 of the arm member 51 so as to be vertically movable, and a key groove 65 is provided on the screw shaft 63 in the vertical direction. The distal end of the stop pin 67 of the clamp lever 69 having a stop pin 67 at the end is engaged with the key groove 65 from the end surface of the arm member 51. This retaining pin 6
Reference numeral 7 denotes a block for preventing rotation of the screw shaft 63. The screw shaft 63 is fixed by tightening the clamp lever 69.

A plurality of spacers 71 are provided below the screw shaft 63, and the screw shaft 63 is attached to the arm member 51 by tightening the spacer 71 with the knob 73. A double nut 75 is provided above the arm member 51 of the screw shaft 63, and is formed so as to always support the screw shaft 63 at a constant height. To change this fixed height, the clamp lever 69
The height can be changed by removing the knob 73, removing the spacer 71 as needed, and inserting the spacer between the double nut 75 and the arm member 51.

Further, the screwing position of the double nut 75 can be finely adjusted vertically by finely adjusting it.

The upper part of the screw shaft 63 is formed with a parallel plane extending in a half-moon shape along the mounting direction of the die 9, and the upper L-shaped bracket is provided at a predetermined interval on the front side on this plane. 77 and a lower L-shaped bracket 79 are attached to face up and down. In the receiving portions of the upper and lower brackets 77 and 79, two elongated holes 81 are formed in parallel in a horizontal direction orthogonal to the mounting direction of the die 9. This long hole 8
A light projector 19 is attached to 1 via a screw 83 so as to be adjustable in position.

With the above configuration, the projector 19 is positioned on the side of the die supporting member by rotating the arm member 51 in the front-rear direction by tightening and loosening the embra knob 55 which is the mounting position conversion device 27 and the die. The position of the support member can be freely changed to the rear with the side opened. And
The mounting position is finely adjusted in the vertical direction by attaching and detaching the spacer 71 as the vertical fine adjustment device 25, and the upper L-shaped bracket 77 and the lower L-shaped bracket 79 serving as the front-rear fine adjustment device 23 are used to adjust the mounting position. Fine adjustment in the front-back direction. As a result, the optical axis is finely adjusted vertically and vertically.

On the other hand, a light receiver 21 provided on the opposite side of the die 9 on the optical axis of the light projector 19 also has a structure shown in FIG.
Also, as shown in FIG. 6, the front-rear direction fine adjustment device 23, the vertical direction fine adjustment device 25, and the mounting position conversion device 27 are provided, so that the optical axes of the light projector 19 and the light receiver 21 can be surely aligned. . For this reason, it can be treated as one that emits laser light with the light projector 19. FIG.
The reference numerals used for and 6 are the same as the configuration on the light projector 19 side, and are used. In the light receiver 21 shown in FIGS. 2 and 5, the die support member (bracket) 33 that supports the die 9 for exchanging the mold is opened at the side and the mounting position is changed rearward. It is shown as converted by device 27.

The light projector 19 and the light receiver 21 as the light beam type safety device 17 having the above-described configuration are mounted on the bracket 33 at both ends in the bending direction of the die 9, and the laser light emitted from the light projector 19 is defined as the optical axis L. On the bending line P passing through the center of the punch 7 and the die 9 of the press brake 1 (M in FIG. 7).
Position), or set from the M position to the somewhat s rear side (N position of FIG. 7), the laser beam emitted from the projector 19 to the optical axis L ₁ or L _2, the light shielding part of the worker's body Then, the light receiver 21 is shielded from light and the input signal becomes 0, the operation of the press brake 1 is immediately stopped, and the safety of the worker is protected.

Further, the projector 19 and the light receiver 21 are additionally provided in a plural number, and are set at two positions: a position on the bending line P and an N position slightly behind the bending line P. 2
One of the case where the optical axis L ₁ and L ₂ is shielded, can also be stopped the operation of the press brake 1, which can prevent a malfunction of the press brake 1. Also, when providing a large number of two or more optical axes, 1
By setting up the emitter / receiver of two sensor bodies (in a staggered arrangement), the directional angle characteristics are narrower, and the receiver is wider.
Adjustment is easier than disposing the projector and the receiver separately.

As described above, the press brake 1 of this embodiment is provided with the light beam type safety device 17 using a laser beam in the vicinity of the pressing position of the punch 7 and the die 9, so that the optical axis can be used even in three-dimensional bending. Since L (L ₁ , L ₂ ) is transmitted to the light receiver 21 side, it is possible to respond to a press operation that was impossible with a conventional press brake provided with a safety device. It should be noted that the laser light is also, for example, a red visible light, so that the light beam type safety device 17 can be used.
Front-back direction fine adjustment device 33 and vertical direction fine adjustment device 25
Adjustment operations such as are also facilitated.

It should be noted that the present invention is not limited to the above-described embodiment, and by making appropriate changes,
Other embodiments can be implemented.

[0028]

As will be understood from the above description of the embodiment, in the invention according to the first aspect, the position of the laser beam is determined by the relative lowering of the punch above the groove formed in the die 9. Since the position of the light-shielded range, it is possible to ensure the safety of the worker, and even when, for example, a box is manufactured by folding a work having a rising portion on both sides, the rising portion is used. The light beam can be accurately positioned without being blocked, and the conventional problems can be solved.

In particular, since the light projector 19 and the light receiver 21 are configured to be movable in the front-rear direction so as to open the side of the die supporting member for supporting the die 9, the die is moved relative to the die supporting member. When the attachment and detachment of the die 9 is performed in the left and right direction, the position can be changed so as not to obstruct the light emitter 19 and the light receiver 21, and the attachment and detachment of the die 9 can be easily performed.

In the invention according to claim 2, the light projector 1
9 and the light receiver 21 are provided so that they can be finely adjusted in the up-down direction and the front-back direction.
When mounted opposite to both sides, the optical axis can be easily matched, and the die support member can be moved in the front-rear direction so as to open the side of the die support member. When the die is exchanged for the member, the side of the die support member can be opened, and it is possible to easily exchange the die for the die support member without obstruction.

[Brief description of the drawings]

FIG. 1 is a front view of a light beam type safety device according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged front view of a projector-side portion of FIG. 1;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is an enlarged plan view of a light-receiving device side portion of FIG. 1;

FIG. 6 is a front view of FIG. 5;

FIG. 7 is an enlarged view showing an optical axis passing position of the light beam type safety device of FIG. 1;

FIG. 8 is a perspective view of a press brake to which the light beam type safety device of FIG. 1 is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press brake 7 Punch 9 Die 17 Light beam type safety device 19 Projector 21 Light receiver 23 Front-back fine adjustment device 25 Vertical fine adjustment device 27 Mounting position conversion device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 5/02 B30B 15/00

Claims (2)

(57) [Claims] 1. An upper table (3) provided with a punch (7) at a lower part and a lower table (5) provided with a die (9) detachable in the left-right direction, wherein the upper table (3) or the lower table (3) is provided. 5) is provided so as to be vertically movable, and has a light projector (19) and a light receiver (21), and stops the vertical movement of the table when the laser beam emitted from the light projector (19) is blocked. In the press brake provided with the light beam type safety device having such a configuration, the position of the laser beam is blocked by the relative lowering of the punch (7) at a position above the groove formed on the upper surface of the die (9). And the light projector (19) and the light receiver (21) are provided so as to be finely adjustable in the up-down direction and the front-rear direction, and a die support member (33) for supporting the die (9). Open side A press brake characterized in that it can be moved in the front-rear direction so as to be released. 2. A press equipped with a pair of a light emitter (19) and a light receiver (21) arranged on both sides of a die supporting member (33) for detachably supporting a die (9) in a press brake in the left-right direction. In the light beam type safety device for a brake, the light emitting device (19) and the light receiving device (21) are provided so as to be finely adjustable in a vertical direction and a front-rear direction with respect to a mounting member to a press brake, and the die supporting member ( 3
3) A light beam safety device for a press brake, wherein the light beam safety device is configured to be movable in the front-rear direction so as to open the side of 3).