JP3636325B2 - Safety equipment for processing machines - Google Patents

Description

  The present invention relates to a safety device for a processing machine that detects that a part of a human body has entered a predetermined monitoring region and controls the operation of the processing machine to a safe side.

  Conventionally, in a press machine that presses a workpiece held in a hand, it is safe to detect that a part of the human body has entered a predetermined monitoring area and control the operation of the press machine to the safe side (stop control). A device is attached.

Various kinds of safety devices of this type are known, and particularly as a safety device using a laser beam, an “optical device for mounting on a movable part” disclosed in JP 2000-502782 A is known. It has been. This device is a safety device for protecting an object entering the path of a moving part (moving blade) of a press brake, and is fixedly attached to the leading edge of the moving part and spaced from the moving part. Opposing light emitting means and light receiving means are arranged to form a protective region in position, and a light beam is emitted from the light emitting means within a predetermined moving range of the movable part, and the emitted light The beam is configured to be received by the optical receiving means. In a normal state, the light beam emitted from the light emitting means is received by the light receiving means along an unobstructed path located at a distance from the front edge of the movable part. On the other hand, the light beam is blocked. In such an unexpected situation, the forward movement of the movable part is stopped by the control means.
JP 2000-502782 Publication

  However, this type of conventional safety device, including the safety device described above, has detected that a part of the human body has entered a predetermined monitoring area when the optical path is interrupted. There was a point.

  First, some materials cannot be processed depending on the type of workpiece. For example, in the case of a workpiece W having an upstanding side plate portion Ws as shown in FIG. 9, the operation of the processing machine is controlled to the safe side due to the presence of the side plate portion Ws that blocks the optical path. Processing of the object W becomes impossible.

  Secondly, in the method in which the light emitting means and the light receiving means move together with the movable part as in the safety device disclosed in the above publication, there is a risk that the movable part cannot be detected until it starts machining after the movable part starts to descend. On the other hand, the method in which the light emitting means and the light receiving means do not move is insufficient from the viewpoint of ensuring a high degree of safety because there is a risk that the light path cannot be blocked depending on the position and size of the hand. It is.

  The present invention solves such a problem existing in the prior art, and increases the versatility and convenience by dramatically expanding the types of workpieces that can be processed, and also provides a high level of safety. It aims at providing the safety device of the processing machine which can be ensured.

  The present invention is attached to the processing machine M that processes the workpiece W held in the hand H, detects that a part (H) of the human body has entered a predetermined monitoring area Zc, and operates the processing machine M. When configuring the safety device 1 of the processing machine M controlled to the safe side, the diffused light radiating means 2t for radiating the diffused light Lt ... in which the laser beam Lo ... is diffused in a curtain shape onto the boundary line Kz of the monitoring region Zc ... And detection units 3p, 3q for detecting that a part (H) of the human body has entered the monitoring region Zc by including the reflected light receiving means 2r for receiving the reflected light Lr ... of the diffused light Lt ... Based on the detection results of the detection units 3p and 3q, the control unit 4 that controls the operation of the processing machine M to the safe side, and the reflected light Lr that is polarized in a different direction with respect to the diffused light Lt on the outer surface is incident on the diffused light Lt. Use a reflective sheet 14 having recursive characteristics to reflect in the direction Has a reflecting surface portion 5, and characterized in that it comprises the operator coupling section 6 to be mounted on the operator.

  Thereby, the diffused light Lt from the diffused light emitting means 2t is radiated in a curtain shape on the boundary line Kz of the monitoring region Zc. On the other hand, since the control unit 4 controls to the safe side in accordance with the detection result of the reflected light receiving unit 2r, the control unit 4 does not respond to the operation of the processing machine M unless the reflected light receiving unit 2r detects the reflected light Lr. Control to the safe side is not performed. On the other hand, the worker provided the reflecting surface portion 5 using the reflecting sheet 14 having a recursive characteristic that reflects the reflected light Lr polarized in a different direction with respect to the diffused light Lt in the incident direction of the diffused light Lt on the outer surface. When the worker mounting portion 6 enters the monitoring region Zc, the diffused light Lt reflects the reflection surface portion 5 of the worker mounting portion 6 and the reflected light Lr. Is received by the reflected light receiving means 2r. As a result, the control unit 4 controls (stops control) the operation of the processing machine M to the safe side based on the light reception (detection result) of the reflected light receiving unit 2r.

  Therefore, according to the safety device 1 of the processing machine M according to the present invention, the following remarkable effects can be obtained.

  (1) Since this method is different from the conventional method of detecting when the optical path is interrupted, the type of workpiece that can be processed, such as a workpiece with an upstanding side plate, can be processed. It can be dramatically expanded and versatility and convenience can be enhanced.

  (2) Unlike the conventional method in which the diffused light is moved together with the movable part, after the processing operation is started, the state is always detectable, so that a high degree of safety can be secured.

  (3) Since the diffused light obtained by diffusing the laser beam is used, the monitoring area can be narrowed if necessary, and processing of a smaller workpiece can be realized.

  (4) Since diffused light in which the laser beam is diffused in a curtain shape is emitted, even if the plate thickness of the mold or workpiece is changed, there is no need to change the position or make adjustments.

  According to the safety device 1 of the processing machine M according to the present invention, according to the best mode, the diffused light emitting means 2t includes the light emitting unit 11 that emits the laser beam Lo, and one or more of the laser beam Lo that diffuses. Cylindrical lenses 12a and 12b are provided. Thereby, the stable diffused light Lt can be obtained easily. In addition, a pair of polarizing filters 13t and 13r that allow light waves (transverse waves and longitudinal waves) in different directions to pass through the laser beam Lo and the reflected light Lr are provided. As a result, the reflected light receiving means 2r reliably detects only the reflected light Lr from the worker mounting portion 6 that reflects the diffused light Lt without being affected (interference) by the laser beam Lo (diffused light Lt). it can. Furthermore, a pair of detectors 3p and 3q are arranged on the left and right above the monitoring region Zc. As a result, a higher level of safety can be ensured such that detection omission can be avoided. On the other hand, at least the work gloves 15 worn by the worker can be included in the worker wearing portion 6. Thereby, a part (H) of a human body can be detected reliably. A preliminary detection unit 16p that sets a preliminary monitoring region Zcs in front of the monitoring region Zc and detects that a part of the human body (H) has entered the preliminary monitoring region Zcs in front of the detection units 3p and 3q. In addition to providing 16q, if the control unit 4 is provided with an alarm function for issuing a preliminary alarm based on the detection results of the preliminary detection units 16p and 16q, the operator can be alerted before the monitoring area Zc, Thereby, while being able to give a worker a sense of security, safety can be further improved.

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the outline | summary of the processing machine M which concerns on a present Example, and the structure of the safety device 1 attached to this processing machine M are demonstrated with reference to FIGS. 1-7 and FIG.

  The processing machine M of the embodiment is a bending machine Mb for bending a metal plate (workpiece W) such as a steel plate, an aluminum plate, a copper plate, etc. held in the hand H. As shown in FIG. 1 (FIG. 9), the bending machine Mb is fixed to the upper table 51 and has an upper mold (fixed mold) 52 having a sword that projects downward, a lower table 53 and a fuselage 54. The lower mold | type (movable type) 55 which has the V groove | channel which raises / lowers by the raising / lowering drive part incorporated in is provided. As a result, when the operator holds the workpiece W in the hand H, puts the workpiece W between the upper mold 52 and the lower mold 55, and then steps on the bar pedal 56 with his / her foot, the lift drive unit operates, The die 55 can be raised and the workpiece W can be bent.

  The bending machine Mb is provided with the safety device 1 according to the present embodiment. The safety device 1 includes a pair of left and right detection units 3p and 3q arranged above the monitoring region Zc. As shown in FIG. 3, the monitoring area Zc of the example was set in a range of about 50 mm before the upper mold 52 and the lower mold 55. Therefore, the detectors 3p and 3q can be monitored on the boundary line Kz of the monitoring region Zc by being attached to the front panel 57 having the upper table 51 shown in FIG. Therefore, the safety device 1 according to the present embodiment can be easily retrofitted to the existing bending machine Mb.

  As shown in FIGS. 1 and 4, the left detection unit 3 p includes a housing 21 having an opening 21 s through which diffused light Lt and reflected light Ls, which will be described later, pass on the bottom surface. A light emitting means 2t and a reflected light receiving means 2r are provided. The diffused light emitting means 2t includes, as basic components, a light emitting unit 11 that emits a laser beam Lo, and two cylindrical lenses 12a and 12b that diffuse the laser beam Lo. In this case, the light emitting unit 11 uses a semiconductor laser element (laser diode) that emits a laser beam Lo having a wavelength of about 630 to 670 [nm] so that the operator can recognize the monitoring region Zc. If the laser beam Lo is used, the monitoring area Zc can be narrowed if necessary, so that processing of a smaller workpiece W can be realized. The cylindrical lenses 12a and 12b diffuse the laser beam Lo on the line, and the laser beam Lo transmitted through the cylindrical lenses 12a and 12b is converted into curtain-like diffused light Lt diffused at a predetermined diffusion angle R. The diffused light Lt is emitted on the boundary line Kz of the monitoring region Zc shown in FIG. The diffusion angle R is preferably about 80 [°] by selecting the focal length of the cylindrical lenses 12a and 12b and the number of combinations so as to correspond to the current maximum mold width. The diffusion angle R can be easily increased by increasing the number of combined cylindrical lenses 12a.

  Furthermore, the diffused light emitting means 2t includes a polarizing filter 13t through which only the transverse wave of the laser beam Lo emitted from the light emitting unit 11 passes, and a slit 22 through which the laser beam Lo passing through the polarizing filter 13t passes. Since the beam diameter of the laser beam Lo can be reduced by the slit 22, the beam diameter is selected and the curtain width of the diffused light Lt is set to about 3 [mm]. Stable diffused light Lt can be easily obtained by the diffused light emitting means 2t configured as described above.

  On the other hand, the reflected light receiving means 2r includes, as basic components, a half mirror 23 disposed between the slit 22 and the polarizing filter 13t, and a light receiving unit 24 that receives the reflected light Lr obtained from the half mirror 23. The half mirror 23 has a function of reflecting the reflected light Lr of the diffused light Lt in the perpendicular direction. The light receiving unit 24 can use a photodiode. Further, the reflected light receiving means 2r includes a polarizing filter 13r disposed between the half mirror 23 and the light receiving unit 24, and a signal processing circuit 26 that processes an output signal obtained from the light receiving unit 24. The polarizing filter 13r has a characteristic that only the longitudinal wave of the reflected light Lr passes. As described above, the polarizing filter 13r and the polarizing filter 13t described above have a function of passing light waves in different directions with respect to the reflected light Lr and the laser beam Lo, that is, the polarizing filter 13t has only a transverse wave, and the polarizing filter 13r has a vertical function. It has a function of passing only waves. Therefore, even if the diffused light Lt hits a metal plate (workpiece W) such as a steel plate, an aluminum plate, or a copper plate, the polarization direction does not change. Therefore, the reflected light Lr does not pass through the polarization filter 13r and The reflected light Lr is not received. Instead of the half mirror 23, a polarizing prism 33 shown in FIG. Thereby, the polarizing filter 13r becomes unnecessary. Since the polarizing prism 33 reflects only the light wave in a specific direction by the reflecting surface having the dielectric film, it also serves as the polarizing filter 13r.

  In addition, the signal processing circuit 26 amplifies an output signal obtained from the light receiving unit 24, a comparator 28 that removes noise and detects only reflected light Lr reflected from a work glove 15 described later, and the comparator 28. The output part 29 which outputs detection signal Sd based on the output result of is provided. Reference numeral 30 denotes a reference voltage setting unit connected to the comparator 28.

  In addition, 31 is a transparent cover that covers the opening 21s, 32 is a shutter attached to the opening 21s, and the opening width of the opening 21s can be adjusted by the shutter 32. The left detection unit 3p has been described above, but the right detection unit 3q can also be configured identically except that it is configured symmetrically with respect to the left detection unit 3p. In order to prevent left and right interference, the wavelength of the laser beam Lo may be slightly different between the left and right.

  Further, a control box 35 incorporating the control unit 4 is attached to an empty position of the front panel 57. The control unit 4 is connected to the detection units 3p and 3q described above, and is connected to the control system of the bending machine Mb. Accordingly, the detection signal Sd output from the output units 29 of the detection units 3p and 3q is given to the control unit 4, and the control unit 4 controls the operation of the processing machine M on the safe side based on the detection signal Sd. To control. In this case, the operation of the processing machine M is controlled to the safe side by any detection signal Sd of the detection units 3p and 3q. In FIG. 1, 58 denotes an emergency stop release button.

  On the other hand, the safety device 1 includes a reflective surface portion 5 that reflects the diffused light Lt on the outer surface, and includes a worker mounting portion 6 that is worn by the worker. The reflecting surface portion 5 uses a night-light reflecting sheet 14 having a recursive characteristic that reflects the reflected light Lr polarized in a different direction with respect to the diffused light Lt in the incident direction of the diffused light Lt. The worker wearing section 6 includes at least a work glove (protective glove) 15 worn by the worker, and can include a part of work clothes and work pants as necessary. FIG. 6 shows a work glove 15 provided with a reflection surface portion 5 that reflects the diffused light Lt on the entire outer surface.

  Generally, a glass bead system and a microprism system are known as the nightlight reflecting sheet having recursive characteristics. As shown in FIG. 6, the embodiment shows a night-light reflecting sheet 14 using a microprism system. The night-light reflecting sheet 14 includes a prism layer 41 in which a large number of microprisms P are arranged, an air layer 42, and a backing 43 using a thin acrylic resin, soft vinyl chloride, or the like, and the outer surface of the prism layer 41 formed on a flat surface. Becomes the incident surface. Thereby, the diffused light Lt incident on the reflective surface portion 5 bounces off the three surfaces of the microprism P, and radiates reflected light Lr polarized in a different direction with respect to the diffused light Lt in the incident direction.

  For this reason, when the work gloves 15 are manufactured, a flexible material that can also be used as a work glove fabric is used for the backing 43 of the night light reflecting sheet 14, and the night light reflecting sheet 14 is directly used as shown in FIG. The work gloves 15 may be manufactured, or as shown in FIG. 7, a work glove body 44 is manufactured using a separate work glove fabric 44, and the luminous reflection sheet 14 is formed into small pieces on the surface. A number of night-light reflecting chips 14p formed by cutting or the like may be pasted.

  Next, operation | movement of the safety device 1 which concerns on a present Example is demonstrated according to the flowchart shown in FIG. 8, referring each figure.

  First, the worker wears work gloves 15 on the hand H. Then, the worker holds the workpiece W with the hand H wearing the work gloves 15 and inserts it between the upper mold 52 and the lower mold 55 of the bending machine Mb as shown in FIG. In this state, when the operator steps on the bar pedal 56 with his / her foot, the bending machine Mb starts a processing operation (step S1). That is, the lower die 55 starts to rise by the operation of the lifting / lowering drive unit built in the machine body 54, and at the same time, the diffused light Lt is emitted from the diffused light emitting means 2t of the detecting unit 3p (the same applies to the 3q side) (step S2). ). At this time, a laser beam Lo is emitted from the light emitting unit 11, and only the transverse wave is extracted from the laser beam Lo by the polarizing filter 13t. Then, the laser beam Lo (transverse wave) passes through the half mirror 23, passes through the slit 22, and then passes through the two cylindrical lenses 12a and 12b to be diffused into a curtain shape having a predetermined diffusion angle R. . The diffused light Lt diffused at the diffusion angle R is transmitted through the transparent cover 31 (opening 21s), the diffusion range is limited by the shutter 32, and then emitted onto the boundary line Kz of the monitoring region Zc shown in FIG. (Step S3).

  At this time, even if the diffused light Lt hits a metal plate (workpiece W) such as a steel plate, an aluminum plate, or a copper plate, the polarization direction does not change. Since the diffused light Lt is only a transverse wave by the polarizing filter 13t, the reflected light Lr is blocked by the polarizing filter 13r that passes only the longitudinal wave. Therefore, the reflected light receiving means 2r does not detect the workpiece W, and the processing operation continues normally unless the work gloves 15 enter the monitoring region Zc (steps S4 and S5). That is, the lower mold 55 continues to rise, and bending is performed by sandwiching the workpiece W between the lower mold 55 and the upper mold 52. An example of this state is shown in FIG. In this case, since the monitoring region Zc is set approximately 50 mm before the upper die 52 and the lower die 55, even a considerably small workpiece W can be processed. When the processing is completed, the lower die 55 is lowered and returned to the home position, thereby completing the processing operation and stopping the emission of the diffused light Lt (steps S6, S7, S8). This completes a series of processing steps.

  On the other hand, it is assumed that the work glove 15 enters the monitoring region Zc during the processing operation, like the work glove 15s indicated by a virtual line in FIG. In this case, as shown in FIG. 2, the diffused light Lt reflects the reflection surface portion 5 of the work glove 15. The reflecting surface portion 5 uses a night-light reflecting sheet 14 having recursive characteristics that reflects the reflected light Lr (longitudinal wave) polarized in a different direction with respect to the diffused light Lt (transverse wave) in the incident direction of the diffused light Lt. The diffused light Lt incident on the reflecting surface portion 5 bounces off the three surfaces of the microprism P, and radiates longitudinal reflected light Lr polarized in a different direction with respect to the transverse diffused light Lt in the incident direction.

  On the other hand, the reflected light Lr passes through the shutter 32 and the transparent cover 31 (opening 21s), passes through the cylindrical lenses 12b and 12a, and enters the half mirror 23. Then, after reflecting off the half mirror 23 and passing through the polarizing filter 13 r, the light enters the light receiving unit 24. Since the reflected light Lr entering the polarizing filter 13r is a longitudinal wave, most of the light wave components pass through the polarizing filter 13r and are detected by the light receiving unit 24. As described above, since the pair of polarizing filters 13t and 13r that pass light waves in different directions (transverse wave and longitudinal wave) with respect to the laser beam Lo and the reflected light Lr are used, the light receiving unit 24 uses the laser beam Lo (diffuse light). Only the reflected light Lr from the worker mounting part 6 that reflects the diffused light Lt can be reliably detected without being affected (interference) by Lt). As a result, an output signal of a predetermined level is output from the light receiving unit 24 and amplified by the amplifier 27. In this case, the output voltage of the amplifier 27 is larger than the reference voltage of the reference voltage setting unit 30 because a predetermined level is ensured. As a result, the output level of the comparator 28 is inverted, and the output unit 29 outputs the detection signal Sd. This detection signal Sd is given to the control unit 4, and the control unit 4 determines that the work glove 15 (part of the human body) has entered the monitoring region Zc (steps S4 and S9).

  Therefore, the control unit 4 controls (stops control) the operation of the bending machine Mb to the safe side (step S10). As a result, the operating bending machine Mb immediately stops and safety is ensured. Based on this, if the operator moves the work glove 15 out of the monitoring region Zc by changing the position with the workpiece W, the reflected light Lr disappears, and the reflected light receiving means 2r enters a non-detection state. . Therefore, when processing is continued, the processing operation is restarted by stepping on the bar pedal 56 again (steps S11, S1,...). That is, the lower die 55 that has been stopped resumes rising, and the emission of the diffused light Lt also resumes.

  On the other hand, when the worker feels danger when the operation of the bending machine Mb is stopped, the emergency stop release button 58 may be pressed (steps S11 and S12). As a result, the lower die 55 is lowered and returned to the home position, whereby the processing operation can be terminated (steps S7 and S8).

  According to such a safety device 1 according to the present embodiment, unlike a method of detecting that a part of the human body has entered a predetermined monitoring area by blocking the optical path as in the conventional safety device, Even a workpiece W having an upstanding side plate portion Ws as shown in FIG. 9 can be processed. Therefore, the types of workpieces W that can be processed are dramatically expanded, and versatility and convenience can be improved. In addition, after stepping on the bar pedal 56 (after the processing operation is started), the detection is always possible, and the pair of left and right detection units 3p and 3q performs detection from two different angles. A high degree of safety can be ensured, for example, a detection omission when only using the direction is avoided.

  FIG. 10 shows a modified embodiment. In this modified embodiment, a preliminary monitoring area Zcs is set before the monitoring area Zc, and a preliminary detection section 16p that detects that a part of the human body has entered the preliminary monitoring area Zcs before the detection sections 3p and 3q. , 16q and an alarm function for providing a preliminary alarm based on the detection results of the preliminary detectors 16p, 16q. In this case, the preliminary monitoring area Zcs can be set to a range of about 200 mm before the monitoring area Zc. The preliminary detection units 16p and 16q can be configured in the same manner as the detection units 3p and 3q, respectively, but the detection accuracy is lower than that of the detection units 3p and 3q. The light emission of a general light emitting diode can be used without using diffused light. Further, an alarm 61 that emits a chime sound or the like is connected to the control unit 4.

  As a result, if the work gloves 15 enter the preliminary monitoring area Zcs, the preliminary detection units 16p and 16q detect the work glove 15, and the control unit 4 activates the alarm 61 to issue a preliminary alarm such as a chime sound. Therefore, since the operator can be alerted before the monitoring area Zc, the worker can be given a sense of security and safety can be further enhanced. In FIG. 10, Kzs indicates the boundary of the preliminary monitoring area Zcs. In FIG. 10, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals, and the configuration is clarified.

  The embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the detailed configuration, shape, material, quantity, numerical value, and the like are within the scope not departing from the gist of the present invention. , Can be changed, added and deleted arbitrarily. For example, in the embodiment, the bending machine Mb is exemplified as the processing machine M to which the safety device 1 is attached. However, the present invention can be similarly applied to various processing machines M such as a cutting machine used in the printing industry and the paper container industry. . Further, the case where the operation of the processing machine M is stopped by detecting that a part of the human body has entered the monitoring region Zc is illustrated, but the case where other control such as an operation in the opposite direction is performed as necessary is excluded. Not what you want. Further, although the case where the laser beam Lo is diffused by the two cylindrical lenses 12a and 12b has been shown, one or three or more cylindrical lenses 12a... Can be used, and as a means for diffusing, the cylindrical lens 12a. In addition, a reflecting mirror or other diffusing means may be used, or the light emitting unit 11 itself may have a diffusing function. On the other hand, although the reflection surface part 5 which reflects the reflected light Lr polarized in a different direction with respect to the diffused light Lt is shown, the different directions include a shooting direction. On the other hand, the detection units 3p and 3q (preliminary detection units 16p and 16q) are shown as a pair arranged on the left and right above the monitoring region Zc (preliminary monitoring region Zcs), but a single detection unit 3p (or 3q) is shown. Or three or more detectors 3p... May be used if necessary.

An external perspective view of a processing machine (bending machine) provided with a safety device according to a preferred embodiment of the present invention, Principle configuration diagram seen from the front of the safety device, Basic configuration diagram of the safety device seen from the plane direction, Configuration diagram of the detection unit in the safety device, Configuration diagram of another detection unit in the safety device, Rear view of work gloves in the safety device, Cross-sectional view in a modified example of the work gloves, A flowchart for explaining the operation (function) of the safety device; The perspective view which shows the state in process with respect to the workpiece by the same processing machine (bending machine), FIG. 1 is a diagram illustrating the basic configuration of a safety device according to a modified embodiment of the present invention as viewed from the plane;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Safety device 2t ... Diffuse light emission means 2r ... Reflection light light reception means 3p ... Detection part 4 Control part 5 Reflection surface part 6 Worker mounting part 11 Light emission part 12a ... Cylindrical lens 13t Polarization filter 13r Polarization filter 14 Nightlight reflection sheet 15 Work Glove 16p ... Preliminary detection part Lo ... Laser beam Lt ... Diffuse light Lr ... Reflected light H Hand W Work piece M Processing machine Zc Monitoring area Zcs Preliminary monitoring area Kz Boundary line of monitoring area

Claims (7)

In a safety device for a processing machine that is attached to a processing machine that processes a workpiece held in a hand, detects that a part of the human body has entered a predetermined monitoring area, and controls the operation of the processing machine to the safe side. A part of the human body has the diffused light emitting means for radiating the diffused light obtained by diffusing the laser beam in a curtain shape onto the boundary line of the monitoring region and the reflected light receiving means for receiving the reflected light of the diffused light. A detection unit that detects entering the monitoring region, a control unit that controls the operation of the processing machine to the safe side based on the detection result of the detection unit, and a reflection that is polarized in a different direction with respect to the diffused light on the outer surface A safety device for a processing machine, comprising: a reflective surface portion using a reflective sheet having a recursive characteristic for reflecting light in an incident direction of the diffused light, and a worker mounting portion to be mounted on a worker. 2. The safety device for a processing machine according to claim 1, wherein the diffused light radiating means includes a light emitting unit that emits a laser beam, and one or more cylindrical lenses that diffuse the laser beam. The safety device for a processing machine according to claim 1, further comprising a pair of polarizing filters that allow light waves in different directions to pass through the laser beam and the reflected light, respectively. The safety device for a processing machine according to claim 1, wherein a pair of the detection units are arranged on the left and right above the monitoring area. The safety device for a processing machine according to claim 1, wherein the worker mounting portion includes at least a work glove worn by the worker. A preliminary monitoring area is set in front of the monitoring area, and a preliminary detection unit that detects that a part of the human body has entered the preliminary monitoring area is provided in front of the detection unit. The safety device for a processing machine according to claim 1, further comprising an alarm function for issuing a preliminary alarm based on a detection result of the preliminary detector. In a safety device for a processing machine that is attached to a processing machine that processes a workpiece held in a hand, detects that a part of the human body has entered a predetermined monitoring area, and controls the operation of the processing machine to the safe side. By having diffused light emitting means for radiating diffused light obtained by diffusing a laser beam in a curtain shape onto the boundary line of the monitoring region and reflected light receiving means for receiving reflected light of the diffused light, a part of the human body can A detection unit that detects entry into the monitoring region, a pair of polarizing filters that pass light waves in different directions with respect to the laser beam and the reflected light, and an operation of the processing machine based on the detection result of the detection unit A safety device for a processing machine, comprising: a control unit that controls a safety side; and a reflective surface portion that reflects the diffused light on an outer surface, and a worker mounting portion that is mounted on a worker.

Images