JP7247731B2 - Safety device for press machine Press machine equipped with said safety device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a safety device for a press machine that presses a material to be pressed having a constant thickness, and a press machine equipped with the safety device.

A press machine presses a material to be pressed, such as a metal, for example, a plate having a certain thickness. The movable side mold is called the press head, and the fixed side mold is called the press table.), the press head is moved toward the press table and pressed against the plate to be pressed, and various It is a device that performs various processing (bending, drawing, punching, etc. to the shape of the mold).

Conventionally, such a press machine is equipped with a safety device that uses an optical sensor to detect the intrusion of a worker's fingers into the press head in order to prevent accidents in which a worker's fingers are caught in the press head. There is a thing (prior art 1).
If a part related to the optical sensor is extracted and illustrated, it becomes as shown in FIG. 4, for example.

As shown in FIG. 4, the optical sensors 31 are opposed to each other to form a light curtain 35 arranged at the boundary between the dangerous area where entry by the operator 33 is prohibited and the safe area where entry is permitted. It has a light projector 37 and a light receiver 39 arranged in the same direction.
The light emitter 37 and the light receiver 39 both have a columnar shape extending vertically. A plurality of light emitting elements (not shown) are arranged in a row in the light emitter 37 along the vertical direction. A plurality of light-receiving elements (not shown) are arranged vertically on the opposite surface in a row like the light-projecting device 37, and form an optical axis in pairs with each light-projecting element.

The light emitted from each light emitting element is received as a light receiving signal by a light receiving circuit (not shown) through the light receiving element. When the value is below the value α, a signal is output that can be used to determine that the light is shielded.
That is, as shown in FIG. 4, when an operator's finger or the like crosses the light curtain 35 formed by the light emitted from each light projecting element, the signal level at the crossing point falls below the reference value α, and the light is blocked. In other words, it is configured to be able to detect the intrusion of the operator's 33 fingers or the like.
This makes it possible to stop the press machine in the dangerous area or issue an alarm when the light is detected.

As an optical sensor, an optical sensor capable of setting a monitoring area for monitoring the area around the conveying device and the processing machine is known. (Previous Document 2)
This optical sensor is an area monitoring sensor that emits detection light in different directions and detects an intruder in a monitoring area based on the reflected light. means, scanning means for scanning the laser light from the light projecting means in the circumferential direction around the rotation axis, and receiving reflected light from an object within a predetermined detection area formed by the laser light scanned by the scanning means. light-receiving means for generating a light-receiving signal based on the light-receiving signal; distance calculating means for calculating a distance to an object based on the light-receiving signal; distance information calculated by the distance calculating means and detected light when the object is detected A detection signal output means is provided for obtaining distance measurement information from the scanning angle, detecting the intrusion of the object, and outputting a detection signal. Here, since the detection area can be set to any shape and width, it is effective for setting the monitoring area corresponding to various monitoring environments.

By the way, in a safety device using an optical sensor as described above to form a detection area such as a light curtain for detecting an intrusion of a worker at the boundary between a dangerous area and a safe area, the length of the press plate to be processed and its Since the formed range differs according to the difference in thickness, this point will be explained based on FIG.
In FIG. 5, 5 is a press stand, 7 is a plate to be pressed placed on the press stand 5, 9 is a press head moving toward the press stand 5, 33 is an operator, and 35 is a danger that the press head 9 will operate. A light curtain is shown to separate the area and the safe area.
FIG. 5(a) shows the case where the plate to be pressed 7 is short, that is, the length is within the danger zone when the plate to be pressed 7 is set on the press stand 5. In this case, the plate to be pressed 7 is Regardless of the thickness, the configuration is such that the dangerous area and the safe area can be completely separated by the light curtain 35 .

On the other hand, when the plate to be pressed 7 is a long product as shown in FIGS. It may be so long that it intersects the light curtain 35 located at the boundary. In this case, it is necessary to set the lower end position of the light curtain 35 above the upper surface of the plate 7 to be pressed by a predetermined distance in advance so that the light curtain 35 does not block the plate 7 to be pressed.
Here, the predetermined distance is usually determined in consideration of the distance between the press head 9 and the light curtain 35 and the thickness of the object to be entered. If it is desired to detect an intrusion of a finger or the like immediately, that is, the height is set to be lower than the height at which the finger or the like crosses the light curtain 35, for example, 14 mm or lower.

JP-A-8-10998 JP 2009-296087 A

However, such a plate to be pressed 7 has various thicknesses. This is the same for the above-described long products, and there are thin plates as shown in FIG. 5(b) and thick plates as shown in FIG. 5(c).
Therefore, in the case of a long product, it is necessary to make adjustments according to the difference in thickness, which will be described with reference to FIGS. 5(b) and 5(c).
5B and 5C, H is the distance from the lower end of the light curtain 35 to the upper surface of the press table on which the plate to be pressed 7 is placed (hereinafter referred to as the press table distance H), and L is the light curtain. 35 to the surface of the plate 7 to be pressed (hereinafter referred to as safety distance L).

As described above, the safety distance L must be kept at a certain distance or less in order to ensure the safety of the worker 33. Therefore, if the thickness of the pressed plate 7 is changed, the light curtain 35 will be It becomes necessary to change the position of the lower end upward or downward, or to change the direction of the press table 5 on which the plate 7 to be pressed is placed upward or downward.

That is, as shown in FIG. 5(b), when the plate 7 to be pressed originally has a predetermined thickness and is set by the distance H of the press table-thickness s of the plate to be pressed=safe distance L (14 mm), the distance is relatively relatively higher than that. When a thick plate to be pressed 7 is to be processed, the press table distance H - the thickness of the plate to be pressed s<14 mm. There is also the possibility of contact with the curtain 35 .

Therefore, in order to ensure the safety distance L=14 mm according to the thickness of the plate to be pressed 7, the position of the press table 5 on which the plate to be pressed 7 is placed is moved downward as shown in FIG. 5(c). Alternatively, although not shown, the position of the lower end of the light curtain 35 must be adjusted upward.
However, in order to change the position of the press table 5 as in the former case, it is necessary to replace the press table 5 with the corresponding press table 5 each time, or to separately provide a vertical movement mechanism for the press table 5, which is time-consuming and requires a large apparatus. may become
In the latter adjustment of the lower end position of the light curtain 35, the detection position of the light curtain 35 is electrically controlled, that is, by program control. The hurdles to do will be very high. .

The present invention has been made to solve this problem, and even when using a press machine capable of processing various pressed plates with different lengths and thicknesses, the distance between the surface of the pressed plate and the detection area is kept constant. It is an object of the present invention to provide a safety device for a press machine capable of ensuring safety and a press machine equipped with the same.

(1) A safety device for a press machine according to the present invention is attachable to a press head and serves as a boundary between a dangerous area where entry of a worker's fingers or the like is prohibited and a safe area where entry is permitted. Equipped with an optical sensor that outputs a detection signal for detecting that a finger or the like has entered a predetermined detection area,
an optical sensor position regulating portion configured to be mountable with the optical sensor and attached to the press head so as to be relatively movable in parallel with the moving direction of the press head;
An extending member extending from the optical sensor position regulating portion toward the side where the plate to be pressed is arranged, wherein the tip of the extending member is located further than the end portion of the detection area on the side of the plate to be pressed. attached to the optical sensor position regulating portion so as to protrude further toward the pressed plate by one distance,
The optical sensor position regulating section is
While the press head moves toward the plate to be pressed,
(a) until the tip of the extension member abuts on the surface of the plate to be pressed, the end portion of the plate to be pressed in the detection area of the optical sensor from the tip position of the press head that presses the plate to be pressed; moves with the press head while protruding in the moving direction,
(b) After the tip of the extension member comes into contact with the surface of the plate to be pressed, the distance between the end portion in the detection area of the optical sensor and the surface of the plate to be pressed is kept at a predetermined distance. , is provided on the press head so as to move relative to the press head in a direction opposite to the moving direction of the press head.

(2) Further, in the apparatus described in (1) above, the optical sensor position regulating portion is arranged so that the tip of the extension member is positioned on the surface of the plate to be pressed while the press head moves toward the plate to be pressed. Until the plate abuts, the end portion of the detection area projects from the tip position of the press head that presses the plate to be pressed by a second distance in the moving direction and moves together with the press head. , the second distance is set according to the time from when it is detected that a finger or the like enters the detection area of the optical sensor until when the press head is stopped. .

(3) In addition, in the above (1) or (2), the optical sensor position regulating portion includes a guide rail provided on the press head and a slider running on the guide rail, An optical sensor is attached to the slider.

(4) In addition, in any one of the above (1) to (3), the press head is configured to be vertically movable.

(5) Further, in the apparatus described in (4) above, the moving distance of the optical sensor position regulating portion relative to the press head when the press head is raised is the distance by which the press head is raised. It is characterized by being shorter than

(6) In addition, in any one of the above (1) to (5),
The optical sensor is
emitting means for emitting laser light as detection light;
scanning means for scanning the detection light from the emitting means in a circumferential direction around the rotation axis;
a light-receiving means for generating a light-receiving signal by receiving light reflected by an object within a set detection area of the detection light scanned by the scanning means;
detection signal output means for outputting a detection signal indicating that an object has entered the detection area based on the received light signal;
It is characterized by having

(7) In addition, in any one of (1) to (6) above, the first distance is 14 mm or less.

(8) A press machine according to the present invention includes the safety device for a press machine according to any one of (1) to (7) above,
It is characterized by comprising a control section for controlling to stop the press head by inputting a detection signal from the optical sensor.

(9) A press machine comprising the safety device for a press machine according to any one of (1) to (7) above,
The apparatus is characterized by comprising a control section for controlling the movement direction of the press head to be changed to the opposite direction in response to the input of the detection signal from the optical sensor.

(10) A press machine comprising the press machine safety device according to any one of (1) to (7) above,
The press machine safety device is provided on the front side, which is the operating side, and the rear side, which is the opposite side, of the press head.

In the press machine safety device according to the present invention, the gap between the surface of the press plate and the detection area of the optical sensor is kept constant even if the press machine is capable of processing various press plates with different thicknesses. things become possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a press machine to which a press machine safety device according to the present embodiment is attached; FIG. 2 is a horizontal view of the safety device for a press machine shown in FIG. 1 from the safety area side, and is an explanatory diagram of the detection area setting capability of the optical sensor and the detection area. FIG. 2 is an operation explanatory diagram of the press machine shown in FIG. 1; It is explanatory drawing of the optical sensor in the conventional safety device. 1 is an explanatory diagram of a problem to be solved by the present invention; FIG.

FIG. 1 shows a press machine 1 provided with a press machine safety device 3 (hereinafter simply referred to as "safety device 3").
The safety device 3 is attached to the press head 9 moving toward the plate 7 to be pressed placed on the press table 5, and detects an intruder entering the dangerous area, and is equipped with an optical sensor 11. By doing so, the position of the optical sensor 11 with respect to the plate 7 to be pressed is kept constant.
The outline of the press machine 1 and the material to be pressed 7 and the details of each configuration of the safety device 3 will be described below.

<Press machine>
The press machine 1 raises and lowers the press head 9 by a drive mechanism 15, presses the press head 9 against the plate 7 to be pressed with a predetermined pressure, and bends the plate 7 to be pressed. The press machine 1 is provided with a control unit 17 for controlling the drive mechanism 15 to lower and raise the press head 9, and the operator operates the operation unit 19 to give control instructions to the control unit 17. It is possible to do so.
The control unit 17 has a function of controlling to stop the driving of the drive mechanism 15 based on the detection signal from the optical sensor 11 that is input.

<Pressed plate>
The plate to be pressed 7 of the present embodiment is intended for a plate having a thickness of 14 mm or more, for example. In some cases, the plate thickness is 20 mm or more, that is, the plate thickness is 34 mm or more.
Although the thickness of the plate to be pressed 7 is not limited in the present invention, the effect of the present invention is more effective when the plate to be pressed 7 is thick and has a large thickness variation.

<Safety device>
The safety device 3 includes an optical sensor 11, an optical sensor position regulating portion 13 on which the optical sensor 11 is mounted, and the optical sensor 11 is mounted so as to be relatively movable with respect to the press head 9; It has an extension member 23 extending toward the plate 7 side.
In this embodiment, the optical sensor position regulating portion 13 is composed of a guide rail 25 having a sensor mounting portion 21 on which the optical sensor 11 is mounted and a slider 27 running on the guide rail 25 .

The slider 27 is free to travel along the guide rail 25, and in the state before the start of processing as shown in FIG. there is
The extension member 23 is a rod-shaped member, and has a resin protection member 29 at its tip to prevent damage to the plate 7 to be pressed when it comes into contact with the plate 7 to be pressed.
The downward extension length b (see FIG. 1) of the extension member 23 from the press head 9 can be freely set, but is set to 280 mm in this example.

When the press head 9 descends and approaches the plate 7 to be pressed from the state shown in FIG.
When the tip of the extending member 23 abuts on the plate to be pressed 7 and then the press head 9 is further lowered, the tip of the extending member 23 is maintained in contact with the plate to be pressed 7, and the pressed plate is pressed. Receiving the reaction force from the plate 7 , the optical sensor 11 attached to the optical sensor position regulating portion 13 rises together with the slider 27 along the guide rail 25 .
Therefore, after the tip of the extending member 23 comes into contact with the plate to be pressed 7, even if the press head 9 descends, the edge P of the detection area S2 set by the optical sensor 11 on the side of the plate to be pressed 7 is not detected. The distance from the plate to be pressed 7 is kept constant.

<Optical sensor>
As the optical sensor 11, various types can be applied, and as described above, the type shown in FIG. 4 can also be applied. .
FIG. 2 shows a detection area S2 set in the detection area settable area S1 in such an optical sensor.
The optical sensor 11 includes a light emitting portion (not shown), a rotating scanning portion (not shown) such as a galvanomirror for scanning the laser beam emitted from the light emitting portion in the circumferential direction about the rotation axis, and a scanning light beam. is set in the detection area settable area S1. A light receiving unit (not shown) that receives reflected reflected light from an object such as a finger of a worker who has entered the detection area S2 and generates a light reception signal, and an object It is determined that an object such as a finger has entered the detection area S2 based on the signal level in the detection area settable area S1 and the signal level of the light reception signal when there is no object and no reflected light is generated, and the detection signal is output. It has a detection signal output section (not shown) for output.

In the case of determining at which position in the detection area S2 an object such as a finger that has entered is detected, a distance calculation unit that obtains the distance to the object based on the light reception signal, and a scanning unit that obtains the reflected light. and a configuration for outputting a detection signal for determining the position of the object within the detection area S2 based on the calculation result of the distance measuring unit. Also good.
As shown in FIG. 2, the scanning angle of the laser light is about 200° around the rotation axis, and has a detection area settable area S1 with a radius of about 10 m, for example. Then, a detection area S2 that can detect the entry of an object such as a finger can be arbitrarily set within the range of the detection area settable area S1.

In the present embodiment, a rectangular detection area S2 is set, and the end P of the detection area S2 on the side of the plate to be pressed 7 is set 14 mm from the tip of the extension member 23 to the base end side. That is, as shown in FIG. 1, the distance a between the tip of the extension member 23 and the edge P of the detection area S2 of the optical sensor 11 is set to 14 mm. This makes it possible to detect an intruding object in the area between the optical sensor 11 and the extension member 23 from the tip to the base end of 14 mm.
The edge P of the detection area S2 on the side of the plate to be pressed 7 is the intersection point of the detection area S2 with a plane including a straight line in the direction of the pressing operation of the press head 9 (vertical downward direction in this embodiment). It is the dot portion on the press plate 7 side.
Therefore, in the detection area S2 of the present embodiment, the end portion P corresponds to this, and if the detection area S2 has the same shape as the detection area settable area S1 and a fan shape with a small radius, the vertical line passing through the center of the fan shape Among the points of intersection between the line and the arc of the detection area S2, the point closest to the pressed plate 7 corresponds to this.

The operation of this embodiment configured as described above will be described with reference to FIG.
The state shown in FIG. 3A shows a state in which the press head 9 is fully raised, and there is a region of distance β between the tip of the extending member 23 and the plate 7 to be pressed. Since this area is outside the detection area S2 of the optical sensor 11, it is not detected by the optical sensor 11 even if the operator's finger enters. Therefore, this area is a workable area.

The state shown in FIG. 3B shows a state in which the press head 9 is lowered from the state shown in FIG. In the process from FIG. 3(a) to FIG. 3(b), the optical sensor position regulating portion 13 to which the optical sensor 11 is attached is positioned by gravity at the end of the guide rail 25 closest to the plate to be pressed 7 where the stopper is located. Regulated. As a result, the optical sensor 11 descends together with the press head 9 and approaches the plate to be pressed 7, but extends downward by a certain distance b in the moving direction from the tip position A of the press head 9 that presses the plate to be pressed 7. The tip of the member 23 moves while maintaining its position. That is, the end P of the detection area S2 of the optical sensor 11 on the side of the plate to be pressed 7 is positioned at the tip position of the press head 9 until the tip of the extension member 23 abuts on the plate to be pressed 7 processed by the press head 9. moves downward while maintaining a state of being positioned at a constant distance (ba).

In the present embodiment, while the press head 9 is descending, the distance between the edge P of the detection area S2 of the optical sensor 11 on the side of the plate to be pressed 7 and the tip position A of the press head 9 is lowered while maintaining the distance b. However, it is not always necessary to maintain a certain distance. That is, when the end P of the detection area S2 of the optical sensor 11 on the side of the plate to be pressed 7 protrudes in the downward direction from the tip of the press head 9, and the entry of the operator's fingers or the like is detected in the detection area S2. It suffices if the distance is kept such that the intruding object is not pinched due to the time lag until the stop operation of the press head 9 occurs.
Therefore, in the case of a press head 9 with a variable lowering speed, the distance may vary during the lowering according to the speed.
In the state shown in FIG. 3B, the lower end of the detection area S2 by the optical sensor 11 is positioned 14 mm above the plate 7 to be pressed. Therefore, when a finger enters the press head 9 side, it is always detected.

The state shown in FIG. 3(c) shows a state in which the press head 9 is further lowered from the state shown in FIG. 3(b). When the press head 9 is further lowered from the state of FIG. 3(b), the optical sensor 11 moves along with the sensor mounting portion 21 to the guide rail while maintaining the state in which the tip of the extension member 23 is in contact with the surface of the plate 7 to be pressed. Ascend along 25. That is, after the tip of the extending member 23 abuts on the surface of the plate 7 to be pressed, the edge P of the detection area S2 on the side of the plate to be pressed 7 detected by the optical sensor 11 and the end P of the plate to be pressed 7 are detected until the press head 9 is lifted again. The safety distance a=14 mm with respect to the surface of the plate 7 is maintained.

The state shown in FIG. 3D shows a state in which the press head 9 is in contact with the plate 7 to be pressed. Processing starts when the press head 9 is further lowered from this state.
3D from the state shown in FIG. 3C to FIG. is kept constant a=14 mm.
The above operation is the same even if the thickness of the plate to be pressed 7 changes. Therefore, the position of the detection area S2 by the optical sensor 11 can be kept constant.

When a detection signal is output from the optical sensor 11 due to an intrusion of a finger or the like, the detection signal from the optical sensor 11 is transmitted to the control unit 17, and the control unit 17 controls the drive mechanism 15 to stop. .
Although the driving mechanism 15 is stopped by the control unit 17 here, other danger avoidance control may be performed. In other words, it is controlled to reverse the downward movement and move upward, drive control to slow down the downward speed sufficiently in time to return the fingers to the safe area again, or notify the operator of danger. A notification may be generated by notification means such as sound or light.

As described above, according to the present embodiment, even when the plate thickness of the plate to be pressed 7 changes by 20 mm or more as in thick plate pressing, the position of the detection area S2 by the optical sensor 11 can be easily detected. , and there is no need to perform operations that violate laws and regulations such as electrical adjustment changes such as changing the mounting position of the optical sensor 11 and re-setting the area.

Further, in the present embodiment, by providing the slider 27 with a stopper, when the press head 9 rises and the tip of the extension member 23 moves above the plate 7 to be pressed, the sensor mounting portion 21 is moved to the press head 9 . In other words, the moving distance of the optical sensor position regulating portion 13 relative to the press head 9 when the press head 9 rises is longer than the distance by which the press head 9 rises. Since it is made short, the area below the tip of the extension member 23 is outside the detection area S2 and becomes an intrusable area where work can be performed, thereby improving workability.

In this embodiment, an example is shown in which the predetermined distance between the edge P of the detection area S2 of the optical sensor 11 on the side of the plate to be pressed 7 and the tip of the extension member 23 is set to 14 mm. The predetermined distance can be set arbitrarily.
For example, the thickness of each part of the body is generally 14 mm or more for fingers, 25 mm or more for hands (palms), and 45 mm or more for arms, legs, and body. It may be appropriately set according to the distance from the end P of the detection area S2 to the press head 9. FIG.

In this embodiment, the press machine 1 to which the safety device 3 is attached is described as a machine that moves vertically up and down to press and deform the plate 7 to be pressed. A machine that presses and deforms the plate 7 to be pressed may be used.
In that case, the optical sensor 11 and the extension member 23 attached to the optical sensor position regulating portion 13 as shown in this embodiment are not configured to be lowered by gravity, but an elastic member such as a spring is used to process the press head. It is preferable to realize by a structure that is biased in the moving direction (closing direction) of the hour.
That is, while the press head 9 moves in the closing direction and the plate to be pressed 7 contacts the tip of the extending member 23, the extending member 23 and the optical sensor 11 are biased and held at a predetermined position in the closing direction. After the tip of the extending member 23 contacts the plate 7 to be pressed, only the attached press head 9 moves in the closing direction against the spring force, while the extending member 23 and the optical sensor 11 move. It is preferable to implement a configuration in which it is held at the predetermined position by the elastic force of the elastic member.

Further, in the present embodiment, as an example of the optical sensor 11, an optical distance sensor that measures the distance to the object by irradiating the object with laser light and receiving the reflected light is exemplified. is not limited to this, as long as the detection area S2 from the optical sensor 11 to the side of the plate to be pressed 7 can be arbitrarily set. There may be.

Further, in the present embodiment, an example is shown in which the safety device 3 is provided on the front side, which is the operation side, of the press head 9, but the present invention is not limited to this, and the back side opposite to the front side You may make it provide also in the side.

Reference Signs List 1 press machine 3 safety device 5 press stand 7 plate to be pressed 9 press head 11 optical sensor 13 optical sensor position regulating portion 15 drive mechanism 17 control portion 19 operation portion 21 sensor mounting portion 23 extension member 25 guide rail 27 slider 29 protection member 31 optical sensor (conventional example)
33 operator 35 light curtain 37 light projector 39 light receiver S1 detection area settable area S2 detection area

Claims (10)

Fingers, etc., have entered a predetermined detection area that can be attached to the press head and is set at the boundary between a dangerous area where entry of a worker's fingers, etc. is prohibited, and a safe area, where entry is permitted. A safety device for a press machine equipped with an optical sensor that outputs a detection signal for detecting an event,
an optical sensor position regulating portion configured to be mountable with the optical sensor and attached to the press head so as to be relatively movable in parallel with the moving direction of the press head;
An extending member extending from the optical sensor position regulating portion toward the side where the plate to be pressed is arranged, wherein the tip of the extending member is located further than the end portion of the detection area on the side of the plate to be pressed. attached to the optical sensor position regulating portion so as to protrude further toward the pressed plate by one distance,
The optical sensor position regulating section is
While the press head moves toward the plate to be pressed,
(a) until the tip of the extension member abuts on the surface of the plate to be pressed, the end portion of the plate to be pressed in the detection area of the optical sensor from the tip position of the press head that presses the plate to be pressed; moves with the press head while protruding in the moving direction,
(b) After the tip of the extension member comes into contact with the surface of the plate to be pressed, the distance between the end portion in the detection area of the optical sensor and the surface of the plate to be pressed is kept at a predetermined distance. 1. A safety device for a press machine, characterized in that it is provided on said press head so as to move relative to said press head in a direction opposite to the moving direction of said press head. While the press head moves toward the plate to be pressed, the optical sensor position regulating portion controls the position of the press head that presses the plate to be pressed until the tip of the extension member comes into contact with the surface of the plate to be pressed. The end portion in the detection area protrudes from the tip position by a second distance in the moving direction and moves together with the press head, wherein the second distance is within the detection area of the optical sensor. 2. The safety device for a press machine according to claim 1, wherein the safety device is set according to the time from detection of entry of a finger or the like into the press head to stop of the press head. 3. The optical sensor position regulating portion according to claim 1, wherein the optical sensor position regulating portion includes a guide rail provided on the press head and a slider running on the guide rail, and the optical sensor is attached to the slider. press machine safety device. 4. A safety device for a press machine according to claim 1, wherein said press head is vertically movable. 5. The press machine according to claim 4, wherein a moving distance by which said optical sensor position regulating portion moves relative to said press head when said press head is raised is shorter than a distance by which said press head is raised. safety device. The optical sensor is
emitting means for emitting laser light as detection light;
scanning means for scanning the detection light from the emitting means in a circumferential direction around the rotation axis;
a light-receiving means for generating a light-receiving signal by receiving light reflected by an object within a set detection area of the detection light scanned by the scanning means;
detection signal output means for outputting a detection signal indicating that an object has entered the detection area based on the received light signal;
The safety device for a press machine according to any one of claims 1 to 5, characterized by comprising: The press machine safety device according to any one of claims 1 to 6, wherein the first distance is 14 mm or less. A press machine comprising the press machine safety device according to any one of claims 1 to 7,
A press machine comprising a control unit that controls to stop the press head by inputting a detection signal from the optical sensor. A press machine comprising the press machine safety device according to any one of claims 1 to 7,
A press machine, comprising: a control section for controlling the movement direction of the press head to be reversed in accordance with the input of a detection signal from the optical sensor. A press machine comprising the press machine safety device according to any one of claims 1 to 7,
A press machine according to claim 1, wherein the press machine safety device is provided on a front side, which is an operation side, of the press head, and on a rear side, which is the opposite side thereof.

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