JP4623813B2 - Light safety device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety device for a press machine.
[0002]
[Prior art]
Some industrial machines are provided with a light-type safety device that stops driving of the press machine when the operator's body is in a dangerous position, like a press machine. For example, FIG. 3 is a diagram for explaining an example of such a light safety device. As shown in the figure, the beam-type safety device is provided between the press machine and the worker, and is composed of a light emitting unit 1, a light receiving unit 2, and a control circuit 3. Then, according to the control signal output from the control circuit 3, the light emitting unit 1 emits light 1-2, 1-3,..., 1-n sequentially from the uppermost light emitting element 1-1, for example, and the light receiving unit 2 The corresponding light is received by the light receiving elements 2-1, 2-2, 2-3,.
[0003]
Here, when light emitted from one of the light emitting elements cannot be received by the corresponding light receiving element, the worker's body, parts, materials, etc. are in a dangerous position for the operation of the press machine. Even if the drive signal is input, the drive of the press machine, that is, the downward drive of the press machine is stopped. Further, when light emission from the light emitting element is interrupted during operation of the press machine, the drive of the press machine is immediately stopped.
[0004]
Further, today, a system is employed in which a one-stroke operation instruction is given to a press machine using a PSDI function (presence sensing device initiation function). That is, for example, when the work material is set in the mold and the hand is returned, a signal for automatically operating the press machine for one stroke from the top dead center position is output.
[0005]
[Problems to be solved by the invention]
The following safety problems occur in the conventional press machine.
In other words, the optical axis created by the light emitting unit 1 and the light receiving unit 2 must ensure a certain safety distance S from the danger area of the press machine. This dangerous area usually varies depending on the size of the upper and lower molds.
[0006]
Therefore, it is preferable to change the position of the optical axis depending on the size of the mold to be used. However, since the dangerous area is unclear and the installation and management of the safety distance is impossible, the dangerous area is generally defined as the front surface of the slide, and the workability is deteriorated at an inappropriate safety distance. For this reason, there is a large interval from the position of the mold where the material is placed to the position where the optical axis is formed, and the operator must bend his body and extend his arm all the time he places the material.
[0007]
In order to solve the above problems, the present invention sets the safe space and the safe distance S to the dangerous area, and the worker can make the safety device semi-automatically the optimum safe distance according to the position of the dangerous area, The present invention provides a light beam safety device that enables safe and efficient work.
[0008]
[Means for Solving the Problems]
According to an aspect of the present invention, the above-described problem is achieved by the first optical axis disposed between the press machine and the operator, the second optical axis disposed at the top of the safety space, and the safety space. A third optical axis disposed at a lowermost portion; the second optical axis and the third optical axis are fixed at an interval that does not damage a hand and arm; and the first optical axis is the second optical axis. This can be achieved by providing a light safety device which is fixed with a safety distance S from the frontmost end of the third optical axis or the frontmost end of the third optical axis.
[0009]
Here, the first optical axis is a main (main) optical axis formed between the press machine and the operator, and a large number of optical axes are formed in the vertical direction at regular intervals. Further, the second optical axis is formed at a non-contact position of the upper die with the slide of the press machine lowered most. Further, the third optical axis is formed at a non-contact position of the lower die of the press machine, and the optical axis at the foremost end of the second or third optical axis is a position where the slide is lowered and the upper die and the lower die are in pressure contact with each other. Formed just before.
[0010]
The first optical axis is disposed at a position having the safety distance S from the frontmost optical axis of the second or third optical axis. By configuring in this way, the formation position of the first optical axis is surely the safe distance S from the formation position of the optical axis at the foremost end of the second or third optical axis, that is, the position where the upper mold and the lower mold are pressed. It becomes a distant position, the formation position of the first optical axis can be changed depending on the size of the mold to be used, etc., and the operator's press work can be performed efficiently.
[0011]
According to a second aspect of the present invention, in the first aspect of the invention, the first optical axis to the third optical axis are formed of, for example, a light emitting element and a light receiving element provided on both side surfaces of the press machine. Yes. That is, the first optical axis to the third optical axis are composed of a light emitting element and a light receiving element provided on both front side surfaces of the press machine, and the third optical axis is independent from the first optical axis. It consists of a light emitting element and a light receiving element. Further, the light emitting element can be composed of, for example, an LED or a laser, and the light receiving element can be composed of a phototransistor, a photodiode or the like.
[0012]
According to a third aspect of the present invention, in the invention of the second aspect, the first optical axis to the third optical axis are disposed, for example, on a first fixed frame, and the fixed frame is not connected to the press machine. It can be moved in the front-rear direction.
With this configuration, the first optical axis can be set to a position where the safety distance S is easily secured by moving the first optical axis to the third optical axis as a unit with respect to the press machine.
[0013]
A fourth aspect of the present invention is the second fixed frame according to the third aspect, wherein the second optical axis to the third optical axis are movable in the vertical direction with respect to the first fixed frame, for example. It is arranged. With this configuration, the second to third optical axes with respect to the shape of the mold can be adjusted in the vertical direction by moving the second fixed frame up and down relative to the first fixed frame. In addition, it is possible to perform work for ensuring the safe distance S.
[0014]
According to a fifth aspect of the present invention, the press machine can be driven when any one or all of the second optical axis to the third optical axis are shielded from light in the third or fourth optical axis. When the light is shielded during driving, the press machine is stopped and the press machine cannot be used unless the position of the first fixed frame or the second fixed frame is adjusted. .
[0015]
That is, when the light is blocked by any of the second optical axis to the third optical axis as described above, for example, the width of the human arm cannot be ensured completely, and a safe interval is maintained. Since it cannot be said, it is set as the structure which cannot use a press machine.
By configuring in this way, the driving of the press machine is stopped and the second fixed frame is reset. Therefore, when securing the safety distance S, the setting can be performed while maintaining a safe interval. it can.
[0016]
According to a sixth aspect of the present invention, after the first optical axis and the second optical axis or the frontmost optical axis thereof, or the first optical axis and the third optical axis or the frontmost optical axis thereof are shielded, It is configured to activate presence / sensing / device / initiation when light is transmitted.
[0017]
This claim is a configuration in which the PSDI function (presence sensing device initiation function) is used in the optical safety device with a control function of the present invention, and particularly defines the conditions for using the PSDI function. That is, after the first optical axis and the second optical axis or the frontmost optical axis thereof, or the first optical axis and the third optical axis or the frontmost optical axis thereof are shielded, the light transmission state In this case, the PSDI is activated.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a cross-sectional configuration of the press machine according to the present embodiment. However, in FIG. 1, the press machine 10 shows the structure of the range required for description of this example.
[0019]
In the figure, a press machine 10 includes a slide 12, an upper die plate 13 to which an upper die (die) 14 is attached, a lower die plate 16 to which a lower die (die) 15 is attached, and a bolster 17 to which the lower die plate 16 is attached. , And a head 18. In FIG. 1, the arrow F direction is the front direction of the press machine 10, and the arrow B direction is the rear direction of the press machine 10.
[0020]
The above-described slide 12 is driven up and down by a driving force created by a drive mechanism (not shown), and an upper die (die) 14 attached to an upper die plate 13 fixed to the slide 12 is driven up and down. . Therefore, the material placed on the lower die (die) 15 is pressed by being pressed against the lower die (die) 15 fixed to the bolster 17. In addition, the position shown with dotted line 12'13'14 'in the same figure shows the position to which the upper mold | type (metal mold | die) 14 (slide 12, upper mold die plate 13) fell most.
[0021]
The press machine 10 is attached with a lower surface guard 19 for arranging a later-described first fixed frame (and second fixed frame) by bolts or the like (not shown).
On the other hand, in the arrangement configuration of the press machine 10 described above, the first optical axis A to the third optical axis C are formed at the positions shown in FIG. Here, the first optical axis A is an optical axis normally formed between the press machine 10 and the operator, and a large number of optical axes are formed vertically at regular intervals.
[0022]
The second optical axis B, even if the upper mold (mold) 14 reaches the lowermost position of the above, a position where the non-contact to the upper mold (mold) 14, the upper die plate 13 Also, it is formed at a position where no contact is made. The second optical axis B is also formed with, for example, nine optical axes at regular intervals. The third optical axis C is horizontally formed at a position where it does not contact the lower die (die) 15 and the lower die plate 16. The third optical axis C is also formed with, for example, nine optical axes at regular intervals.
[0023]
Further, the foremost optical axis of the second optical axis or the third optical axis is disposed immediately before the upper mold (mold) 14 and the lower mold (mold) 15.
Here, the distance between the first optical axis A and the foremost optical axis of the second optical axis or the third optical axis is set to the safety distance S. This safety distance S is defined according to the following calculation formula. That is,
Safety distance S = Press machine sudden stop time (ms) x Safety factor 1, 6 (mm)
Therefore, it is set for each press machine, and the press machine 10 of the present example is also set to the safety distance S in accordance with the above regulations.
[0024]
Next, the processing operation of this example in which the safety distance S is maintained and the foremost optical axis of the first optical axis A to the second optical axis B or the third optical axis C is set will be described below.
FIG. 2 shows the configuration of the first and second fixed frames for setting the foremost optical axis of the first optical axis A to the second optical axis B or the third optical axis C to a predetermined position. FIG. Moreover, the figure (a) is the top view, and the figure (b) is the side view. In FIGS. 2A and 2B, the first fixed frame 20 is provided on the lower surface guard 19 provided in the press machine 10 described above, and is configured to be movable in the arrow f direction and the arrow b direction. Yes. The first fixed frame 20 is provided with a light emitting element for creating the first optical axis A described above.
[0025]
The first fixed frame 20 is provided with a second fixed frame 21 that can move up and down. The second fixed frame 21 is provided with light-emitting elements for creating the second optical axis B to the third optical axis C described above. Hereinafter, the arrangement configuration of the light emitting elements corresponding to the first optical axis A to the third optical axis C will be described.
[0026]
First, the first optical axis A is configured by n light emitting elements 22-1 to 22-n disposed on the frame 20a of the first fixed frame 20. The arrangement interval of the n light emitting elements 22-1 to 22-n is, of course, the same as the optical axis interval of the first optical axis A shown in FIG. However, it is a condition that there is a fixed frame (not shown) in which a light receiving element is disposed at a position facing the light emitting elements 22-1 to 22-n. Therefore, in this example, a fixed frame (not shown) in which a light receiving element is disposed at a position facing the press machine 10 is also necessary.
[0027]
The second fixed frame 21 is provided with light emitting elements 23-1 to 23-9 for forming the above-described second optical axis B, and these nine light emitting elements 23-1 to 23-9. The arrangement interval is also the same as the optical axis interval of the second optical axis B shown in FIG. In addition, as described above, a fixed frame in which a light receiving element is disposed at a position facing the light emitting elements 23-1 to 23-9 is necessary.
[0028]
The second fixed frame 21 is provided with light emitting elements 24-1 to 24-9 for creating the third optical axis C described above, and these nine light emitting elements 24-1 to 24-9. Is also the same as the optical axis interval of the third optical axis C described above.
In addition, the second fixed frame 21 in which the light emitting elements 23-1 to 23-9 and 24-1 to 24-9 described above are disposed is vertically arranged with respect to the first fixed frame 20 as described above. It is configured to be movable, and is fixed to the first fixed frame 20 by four screws 26 after the movement.
[0029]
The light emitting elements 22-1 to 22-n for creating the first optical axis A are arranged over the length a as shown in the figure, and are used for creating the second optical axis B. The light emitting elements 23-1 to 23-9 are arranged over the length b, and the light emitting elements 24-1 to 24-9 for forming the third optical axis C are arranged over the length c. ing.
[0030]
In the above configuration, when a worker performs a new press work, for example, the mold is replaced, and the upper mold (mold) 14 and the lower mold (mold) 15 are replaced with the upper mold plate 13 or the lower mold described above. Attach to plate 16.
Next, in this state, the first fixed frame 20 is moved in the direction of the arrow f and the direction of the arrow b, and the safety distance S is set. Further, the second fixed frame 21 is moved up and down with respect to the first fixed frame 20, and the positions of the second optical axis B to the third optical axis C are set.
[0031]
Next, in the above-described state, the press machine 10 is driven to emit light from the light receiving elements corresponding to the first optical axis A to the third optical axis C. When the material is inserted in this state, first the first optical axis A is blocked, and then the second optical axis B or the third optical axis C is blocked. Further, a material is placed on the lower mold (mold) 15. Therefore, when the first fixed frame 20 and the second fixed frame 21 described above are set at normal positions, the first optical axis A and the first optical axis A can be obtained when the material is placed on the lower mold (mold) 15. The second optical axis B is blocked, or the first optical axis A and the third optical axis C are blocked.
[0032]
Therefore, when the arm is returned in this state, all the three optical axes are in a light-transmitting state, and a normal pressing operation can be performed. Therefore, in this case, PSDI activation can be performed to use the PSDI function.
By configuring as described above, the first optical axis A is set at a distance of a safety distance S from the mold installation position or a distance of a safety distance S from the upper die plate 13 or the lower die plate 16. The optical axis A can be set, and the first optical axis A can be set at a shorter distance than before. Therefore, by configuring as described above, the operator can perform the press work at a position closer to the press machine 10 and can improve the work efficiency. In addition, the position setting of the first optical axis A in this example is simple. For example, the second optical axis B and the third optical axis C may be set so as not to block light by operating a handle (not shown). A very efficient press operation can be performed by a simple operation.
[0033]
In the description of the above-described embodiment, the number of the second optical axis B and the third optical axis C is set to nine. However, the number is not limited to the above number.
[0034]
【The invention's effect】
As described above, according to the light safety device with a control function of the present invention, the installation position of the first optical axis A can be brought close to the press machine, and more efficient press work can be performed.
[0035]
Further, the operation of installing the first optical axis A at the safe distance S is extremely simple, and a great effect of improving workability can be obtained by the simple operation.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a light beam safety device with a control function according to a first embodiment.
FIG. 2A is a plan view of a first fixed frame, and FIG. 2B is a side view of the first fixed frame.
FIG. 3 is a diagram illustrating a basic configuration of a light beam safety device.
[Explanation of symbols]
10 Press machine 12 Slide 13 Upper die plate 14 Upper die (die)
15 Lower mold (mold)
16 Lower die plate 17 Bolster 18 Head 19 Lower surface guard 20 First fixed frame 20a Frame 21 Second fixed frames 22-1 to 22-n Light emitting elements 23-1 to 23-9 Light emitting elements 24-1 to 24- 9 Light emitting element 26 Screw

Claims (6)

Oite between the press machine and the operator, a plurality of first optical axis disposed in a vertical direction with respect to the press machine,
Between the first optical axis and the upper mold when the upper mold of the press machine reaches the lowest position, the first optical axis is arranged in a direction perpendicular to the arrangement direction of the plurality of first optical axes. A plurality of second optical axes provided;
Between the first optical axis and the lower mold of the press machine, a plurality of third optical axes arranged in parallel to the arrangement direction of the plurality of second optical axes,
Have
The first optical axis to the third optical axis are each constituted by a pair of light emitting elements and light receiving elements provided on both side surfaces of the press machine,
The first optical axis is the optical axis closest to the upper mold among the plurality of second optical axes, or the optical axis closest to the lower mold among the plurality of third optical axes , A beam-type safety device having a safety distance required based on a time required for the press machine to stop suddenly . A pair of light emitting elements and light receiving elements respectively constituting the first optical axis to the third optical axis are disposed on first fixed frames provided on both side surfaces of the press machine ,
The first fixed frame, light safety device according to claim 1, characterized by being mounted so that it can move back and forth direction with respect to the press machine. A pair of light-emitting elements and light-receiving elements that respectively constitute the second optical axis to the third optical axis are arranged on a second fixed frame that is movable in the vertical direction with respect to the first fixed frame. The light-type safety device according to claim 2, wherein When a part of the press machine shields any or all of the second optical axis to the third optical axis, the press machine cannot be driven.
The light beam safety device according to claim 3. When any or all of the second optical axis to the third optical axis are shielded during driving by a part of the press machine, the press machine is stopped and the first fixed frame or the second optical axis is stopped. The press machine was prevented from moving without adjusting the arrangement position of the fixed frame.
  The light beam safety device according to claim 3. After shielding the first optical axis and the second optical axis or its frontmost end optical axis, or the first of the optical axis the third optical axis or its frontmost end optical axis, it becomes the light passing state 2. The beam-type safety device according to claim 1, wherein activation of presence sensing device initiation is performed.

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