JPH10166192A - Sensitive type press starter and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the degree of fatigue of an operator due to the automatic starting different from the intention of the operator and to improve workability. SOLUTION: In the sensitive type press starter being provided in the inlet of the working surface making the hand of the operator and a stock invade into a slide working zone and moreover automatically starting a press based on the shielding signal and the recovery signal of a light beam type safety device for making the emergency stop of the slide under operation by detecting the shielding of the light beam due to invaded objects, a starting range setting means 10 setting a specified shielding range enable automatic starting as the starting range, a starting range storage means 22 storing this set starting range, a starting range comparing and judging means 23 outputting a starting command when the shielding range obtained based on the inputted shielding signal of each optical axis is checked whether it is within the stored starting range or not and it is within the starting range, and a PSDI starting means 24 automatically starting the press 1 based on this starting command are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for preventing a start-up of a sensitive press starter automatically started by using a light beam safety device of a press machine.

[0002]

2. Description of the Related Art Conventionally, a light beam type safety device is provided at an entrance of a work surface in order to prevent an accident when a part of an operator's body enters a slide operation area during operation of a press machine. Some specific press machines use this light beam safety device for an automatic activation device. That is, the press machine is automatically activated by a light-shielded signal detected by the light beam type safety device, and this is usually called a sensitive press activation device (hereinafter, referred to as PSDI). FIG. 8 is a perspective view showing an example of a press machine equipped with such a light beam type safety device. The PSDI will be described below with reference to FIG.

[0003] In the center of the press machine 1, a slide 2 having a mold attached to the lower surface is provided so as to be vertically movable.
The work area 3 in which the slide 2 moves up and down is defined as a danger area. The other surface except the work surface on which the worker works (usually the front surface of the press machine) is surrounded by a guard or the like so that members and the like do not enter from the outside. A light beam type safety device 4 is disposed on the left and right of the entrance of the work surface. The light beam type safety device 4 is composed of a light projector 4a and a light receiver 4b facing each other.

As shown in FIG. 9, light emitting elements (for example, light emitting diodes or the like) are arranged in a normal light projector 4a at a predetermined interval P in the vertical direction, and a light receiving element (for example, , Photodiodes, etc.) are arranged at predetermined intervals P in the vertical direction. The light beam emitted from the light projector 4a is received by the light receiver 4b to form a light curtain at the entrance of the work surface. The light curtain is shielded from an intruder (for example, a hand or a material) from the outside, so that the intrusion into the dangerous area is detected. Normally, a controller (not shown) operates when the slide 2
If is operating, the slide 2 is emergency stopped to prevent an accident.

On the other hand, in the PSDI using the light beam type safety device 4 as described above, a hand or the like is inserted into the light beam curtain to shield the light, and then the light is recovered from the light (hereinafter, referred to as “light-sensitive curtain”).
This is called a break), and a start signal is output based on the number of breaks to automatically start the press machine 1. Normally, there are a "1 break mode" in which the automatic start is performed by one break and a "2 break mode" in which the automatic start is performed by two breaks, which can be selected by a changeover switch or the like.

The 1-break mode corresponds to, for example, a case where a worker holds a material by hand and places it in a mold, and then retracts the hand out of the press machine 1. This is equivalent to a case in which the finished work is taken out to the outside with one hand, the next material is held in the mold with the other hand, and this hand is retracted outside. PSD
I compares the number of breaks based on the selected break mode, and automatically starts the press machine 1 when the number of times matches the number of breaks in the set mode.

[0007]

However, in the conventional light beam safety device, the protection range of the light beam safety device that protects the area where the work is taken in and out (the vertical length of the light curtain in FIG. 9) is not sufficient. It is usually wider than it really is to handle a particular work. Therefore, if all optical axes of the light beam type safety device are used as sensors for automatic activation by PSDI, the optical axis range that can be activated is too wide. For this reason, there is a case where a part of the body (for example, a head, a shoulder, an elbow, etc.) intrudes unconsciously to block light. For example, when the worker is tired, the posture becomes poor, and As a result, they often involuntarily invade their heads.

[0008] In the case of the 2 break mode, for example, if the operator enters a part of the body into the optical axis range without being aware and returns it, the PSDI determines that this is the first break. Then, when the operator inserts his hand and returns it assuming that the break is the first break, the PSDI determines that the break is the second break and automatically starts the slide 2. At this time, the worker attempts to insert his / her hand into the work area 3 with the intention of making a second break. For this reason, the worker feels very danger to an unexpected sudden start of the press machine, and the fatigue and stress of the worker increase.

Further, in the conventional configuration, the automatic activation by the PSDI works only when the slide 2 is stopped at the top dead center, and this automatic activation is not accepted in other strokes. For this reason, since it is necessary to wait until the slide 2 stops at the top dead center, the work efficiency does not increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and reduces the degree of fatigue of an operator due to automatic activation different from the intention of the operator, and widens a process range in which activation can be accepted. It is an object of the present invention to provide a responsive press starting device and a method thereof capable of improving workability.

[0011]

In order to achieve the above object, an invention according to the first aspect of the present invention is directed to an entrance of a work surface where a worker's hand or material enters a work area of a slide 2. And a press machine 1 based on a light-shielded signal of each optical axis of a light beam type safety device 4 for detecting a light-shielded light beam by an intruding object and emergency-stopping the operating slide 2 and a subsequent recovery signal. Range setting means 10 for setting a specific light-blocking range of the optical axis of the light beam type safety device 4 that enables the automatic start-up of the press machine 1 as a start-up range, Starting range storage means 22 for storing the obtained starting range, and whether or not the light blocking range obtained based on the light blocking signal of each optical axis input from the light beam type safety device 4 is within the stored starting range. Check And, when it is determined to be within the activation range, starting to output a start command range comparison determination unit 23
And a PSDI activating means 24 for automatically activating the press machine 1 based on the activating command.

According to the first aspect of the present invention, a specific light-shielding range of the optical axis of the light beam type safety device is set as a starting range and stored, and a break occurs within this starting range (light blocking and subsequent recovery). Only when an operation is performed, automatic activation by the sensitive press activation device is enabled. Therefore,
Even if the head or the shoulder is erroneously or unconsciously shielded from light outside the set activation range, it is not determined as a break. As a result, since the automatic start is not performed against the intention of the worker, the degree of fatigue of the worker is reduced, and the workability and safety are improved.

The invention described in claim 2 is the first invention.
The activation range setting means 10 includes a light-shielding setting capturing means 21 for instructing a timing of capturing a light-shielding signal of each optical axis from the light beam type safety device 4, and the light-shielding setting capturing means 21 includes: The light-shielding range is determined and set based on the light-shielding signal of each optical axis which is received when receiving the capture timing command from the setting capturing means 21.

According to the second aspect of the present invention, it is possible to actually set the optical axis range that can be automatically activated by shading when the operator presses, ie, the activation range, by teaching. That is, a light-shielding signal when a material is actually carried in or when an operator performs a light-shielding operation for activation is captured by a capture timing command of the light-shielding setting capturing means. Then, the light-shielded optical axis range is obtained based on the light-shielded signal, and the start-up range can be calculated and set in consideration of the allowable value. As a result, the activation range is set in accordance with the actual press work, so that the operability and workability during the press work can be improved.

The invention according to claim 3 is the same as the invention according to claim 2.
In the responsive press starter described in the above, the light shielding setting capturing means 21 outputs the capturing timing command when the position of the slide 2 is within a predetermined press stroke, and a position signal of the slide 2 It is characterized by being one of a slide position detecting means for outputting and instructing the capture timing and a capture switch for outputting a capture timing command by manual operation.

According to the third aspect of the present invention, the light-shielding setting taking-in means, when the starting range is actually set by teaching, the light taught when the slide position is within a predetermined press stroke. A command to capture the shaft light blocking position may be output. At this time, the press process
For example, it can be detected by an output signal of a rotary cam device, a slide position signal of a crankshaft rotation angle detecting means, a slide position detecting means, or the like. Therefore, the operability during teaching is improved. Alternatively, the light-shielding setting capturing means may be a capturing switch, and an operator may operate the capturing switch to capture and store the taught optical axis light-shielding position. As a result,
It is possible to easily set and store the activation range.

The invention described in claim 4 is the first invention.
The start-up range setting means 10 is a start-up range setting switch 30 that can directly set the optical axis position of the start-up range.

According to the fourth aspect of the present invention, the start-up range can be directly set by designating the allowable range of the position of the optical axis which is shielded during automatic start-up by the sensitive press starter. Therefore, the activation range can be set accurately and easily, and the operability at the time of setting is good.

According to a fifth aspect of the present invention, there is provided the sensitive press starter according to the first aspect, wherein a press stroke determining means for determining a current press stroke based on the position of the slide is provided. Based on the result determined by the means 12, it is determined whether or not the current press process is a process in which the start can be accepted. If the current process is a process in which the start can be accepted, the start acceptability determining unit 25 outputs a start permission command. Only when a start permission command is input, a PSDI starting means 24 for automatically starting the press machine 1 based on a start command from the start range comparison / determination means 23 is provided.

According to the fifth aspect of the present invention, the automatic start-up by the sensitive press starter can be performed only when the press stroke when the light-shielding operation is performed is a stroke capable of receiving a predetermined start-up. By setting the process that can be activated to be a process that is safe even when the light-shielding operation is performed, the safety during the light-shielding operation is improved.

According to a sixth aspect of the present invention, in the responsive press starter according to the fifth aspect, the start acceptability determining means 25 receives the start when the slide 2 is in the ascent stroke or the top dead center stop stroke. It is characterized in that it is possible to accept the activation during the descending stroke of the slide 2 and to stop the press in an emergency.

According to the sixth aspect of the invention, the start-receivable stroke is limited to the ascending stroke of the slide or the top dead center stop stroke, and is not accepted for the descending stroke. Let it. Therefore, safety at the time of the light shielding operation is improved.

According to a seventh aspect of the present invention, there is provided a sensitive press starting apparatus according to any one of the first to fifth aspects,
The activation range storage means 22 is capable of storing and reading out the activation range corresponding to each worker, and when the activation range storage means 22 stores the activation range, or When reading out the activated range, a worker specifying means 11 for outputting a worker specifying signal for specifying a worker is provided.

According to the invention described in claim 7, the activation range is stored for each worker according to the individual differences such as the physique and posture or habit of the worker at the time of working, and the worker is made to correspond to the worker at the time of press work. Startup range can be set. Therefore, since the worker can work in a natural posture, the work is facilitated, the workability can be improved, and unconscious automatic activation can be reduced.

The invention according to claim 8 is provided at the entrance of a work surface in which a worker's hand or material enters the work area of the slide 2, and operates by detecting light shielding by an intruder. In a starting method of a sensitive press starting device for automatically starting the press machine 1 based on a light blocking signal of each optical axis of a light beam safety device 4 for emergency stop of the inside slide 2 and a subsequent recovery signal, a light beam safety device is provided. A specific optical axis range among all the optical axes of the device 4 is set in advance as a starting range, data of the starting range is stored, and the optical axis position of the light shielding signal of the light beam type safety device 4 is set at the time of press work. And the stored start range is compared, and when the optical axis position of the light blocking signal is within the stored start range, the press machine 1 is started.

According to the eighth aspect of the present invention, a specific light-blocking range of the optical axis of the light beam type safety device is set as a starting range and stored, and a break occurs within this starting range (light blocking and subsequent recovery). Only when an operation is performed, automatic activation by the sensitive press activation device is enabled. Therefore,
Even if the head or the shoulder is erroneously or unconsciously shielded from light outside the set activation range, it is not determined as a break. As a result, since the automatic start is not performed against the intention of the worker, the degree of fatigue of the worker is reduced, and the workability and safety are improved.

According to a ninth aspect of the present invention, in the starting method of the sensitive press starting device according to the eighth aspect, the specific optical axis range as the starting range is set to the light beam type safety device 4.
Is set by teaching the position where the light beam is shielded by the actual loading of the material or the position where the light is shielded by the operation of the operator.

According to the ninth aspect of the present invention, a specific optical axis range that can be automatically activated by shading when a worker performs a press operation, that is, an activation range, is actually set by teaching. That is, when the material is actually loaded,
Alternatively, a light-shielded optical axis range is obtained based on a light-shielded signal when a worker performs a light-shielding operation for activation, and the activation range can be calculated and set in consideration of an allowable value. As a result, the activation range is set in accordance with the actual press work, so that the operability and workability during the press work can be improved.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sensitive press starting apparatus and method according to the present invention will be described in detail with reference to the drawings.

As described above, according to the present invention, a specific range of the optical axis of the light beam type safety device is determined in advance as an activation range, and can be activated only when a break occurs within this activation range, and light is blocked in another optical axis range. If it is done, it is not counted as a break.

FIG. 1 is an explanatory diagram of a starting range and a method of setting the starting range. An example of a starting range setting method will be described with reference to FIG. Here, the signs of the optical axes connecting each light emitting element of the light projector 4a and each light receiving element of the light receiver 4b are A to L from the top.
In FIG. 1 (a), when an operator takes out a work from the press machine 1 or sets a material,
In general, the range of the lower optical axis such as the optical axes i, J, and K is used, so that this range is often blocked. However, since the above-mentioned light-shielding range differs depending on individual differences such as the physique or habit of the worker, in consideration of these individual differences, the present invention sets the light-shielding optical axis position directly by teaching for each worker. Thus, a setting method for determining the activation range is described.

When the starting range is determined by teaching, as shown in FIG. 1 (a), a light-shielding trial is performed for each worker in accordance with the actual work, and at this time, the position of the actually shielded optical axis is detected. . Alternatively, in the case of directly setting, the position of the light-shielded optical axis is input and set by a start range setting switch or the like. And, based on this light-shielded optical axis position,
Start range is set. For example, when the adjacent optical axes i, J, and K are the light-shielded optical axis positions as shown in FIG. 1B, the N light beams above and below the light-shielded position are shown in FIG. 1C. The optical axis is added as an allowable value. In the figure, N is set to 1 and one upper and lower optical axis H and one optical axis L are added as allowable values, thereby setting the range of the optical axes H to L as an activation range. Then, when a predetermined number of breaks selected in advance are made within the set start range, the automatic start is performed. When the range of the optical axes A to G outside the activation range is shielded, the count is not counted as a break, and if the slide operation is being performed, the press is emergency stopped.

Hereinafter, the first embodiment will be described with reference to FIGS. FIG. 2 is a block diagram showing a hardware configuration of the unexpected start-up prevention device according to the present embodiment. The light beam type safety device 4 has a plurality of optical axes, and outputs a light blocking signal corresponding to each light axis to the controller 13 when the light axis is blocked. Further, the light-shielding setting capturing means 21 instructs a timing for capturing a light-shielding optical axis range obtained from the above-described light-shielding signal of each optical axis as an activation range, and outputs the capturing signal to the controller 13. This shading setting capturing means 21
For example, a rotary press device for turning on / off a predetermined output signal in a predetermined rotation angle range of a crankshaft in a mechanical press, or a slide position detection means (a crankshaft rotation angle detector, (A linear sensor in a dynamic press) or the like. Incidentally, the light-shielding setting capturing means 21 may be constituted by a capturing switch capable of outputting the capturing signal by an operation of an operator.

The worker specifying means 11 has a function of specifying a worker who performs a press work, and transmits a worker specifying signal or / and worker ID data for this purpose to the controller 13.
Output to The worker identification unit 11 stores, for example, a setting switch that can directly set an ID number (identification number) of the worker, or stores a worker ID number and activation range data registered corresponding to the worker. ID card or the like. Further, the press stroke detecting means 16 detects a press stroke based on the position of the slide 2 and outputs a detection signal to the controller 13. Here, the press stroke detecting means 16 detects the crankshaft rotation angle by the rotary cam device or the encoder when the press machine 1 is a mechanical press, and when the press machine 1 is a direct-acting press. Can detect the position of the slide 2 by a linear sensor such as a magnescale.

The controller 13 is mainly composed of, for example, a microcomputer. When setting the activation range, the light-shielded signal from the light beam safety device 4 and the worker identification signal from the worker identification unit 11 are input at the input timing of the capture signal from the light-shield setting capture unit 21. And worker ID data, and based on these signals and data, activate range data corresponding to each specified worker is stored in a predetermined area. Alternatively, the activation range data corresponding to each worker is stored in the corresponding worker I
Store in D card. Further, at the time of press work, a press stroke is determined based on a detection signal from the press stroke detection means 16, and the light-shielding signal is input at a predetermined stroke, and the light-shielding optical axis position at this time is determined as described above. It is determined whether or not it is within the set activation range, and if it is within the activation range, an activation command signal is output to the press activation circuit 14.

The press starting circuit 14 controls the driving device of the slide 2 according to a starting command signal from the controller 13 to start or stop the press machine 1. The drive device for the slide 2 may be a drive motor for rotating a crankshaft of a mechanical press, or a hydraulic cylinder or a direct drive motor of a direct drive press.

Next, the functional configuration of the first embodiment will be described with reference to the functional configuration block diagram shown in FIG. The beam-type safety device signal input means 20 receives a light-blocking signal for each optical axis from the beam-type safety device 4, and outputs a light-blocking state signal (representing a light-blocking state and a light-transmitting state) of all optical axes to the activation range setting means 10 and It outputs to the activation range comparison determination means 23. In the present embodiment, the activation range setting means 10 includes a light-shielding setting capturing means 21. In the start range setting mode, the light shielding setting capturing means 21 checks whether or not the position of the slide 2 (corresponding to the stroke) is within a predetermined range based on an input signal from the rotary cam device or the slide position detecting means. When it is within the range, the light-shielded state signal from the light beam type safety device signal input means 20 is taken in. Thereafter, the activation range setting means 10 outputs the light shielding optical axis position obtained based on the light shielding state signal to the activation range storage means 22 as activation range data. In the case where the capture switch (not shown) is provided as the light-shielding setting capturing means 21, the activation range setting means 10 captures the light-shielding state signal in response to the capture signal from the capture switch, and thereafter, receives the light-shielding state signal. Is output to the activation range storage means 22.

The worker specifying means 11 outputs a worker specifying signal (for example, ID number data or the like) instructed by a setting switch or an ID card to the activation range storage means 22. Alternatively, the worker identification unit 11 may output the worker ID data such as the worker-specific startup range data stored in the worker ID card to the startup range storage unit 22. The start-up range storage means 22 corresponds to the input worker identification signal in the start-up range setting mode,
The activation range data from the activation range setting means 10 is stored for each worker, and then, during the press work, the activation range data corresponding to the worker identification signal in the stored activation range data is compared with the activation range comparison determination means. 23.

The activation range comparison / judgment means 23 compares the light-shielding state signal from the light beam type safety device signal input means 20 with the activation range data from the activation range storage means 22 at the time of press work. It is determined whether the optical axis position is within the activation range. If the result of this determination is that the light-shielded optical axis position is within the activation range, the activation range comparison determination means 23
Outputs a start command to the PSDI starting means 24.

The press stroke determining means 12 determines which stroke the press is in based on the detection signal from the press stroke detecting means 16. For example, based on a rotary cam signal, a crankshaft rotation angle signal, or a slide position signal, a determination is made as to whether the slide position is a top dead center stop stroke, a descending stroke, or an ascending stroke. Output to Further, the start acceptability determining means 25 checks the result of the determination, and determines that the start is acceptable, for example, in the case of a rising stroke or a top dead center stop stroke, and outputs a start permission command to the PSDI starting means 24. When the slide position is in the descending stroke, it is determined that the start cannot be accepted, and the start permission command is not output. In addition,
The process that can be started according to the present invention is not limited to the ascending process or the top dead center stopping process.
A range suitable for processing conditions and press machine specifications, such as “0 °”, can be set.

The PSDI activating means 24 activates the slide 2 based on the activating command from the activating range comparing / determining means 23 only when an activating permission command is input from the activating acceptability determining means 25. When the start permission command is not input, the slide 2 is emergency stopped even if the start command is input.

Next, an activation method of the sensitive press activation device according to the present invention will be described with reference to flowcharts shown in FIGS. In step 100, 1
For the shot, the operator operates a manual start switch (not shown) (for example, a left / right operation button for two-hand operation),
The press machine 1 is started. From the second shot on, the press machine 1 is started by (starting range comparison / judgment means 23) automatic starting in steps described later. Thereafter, in step 101 (PSDI starting means 24), the descending process is started,
The slide 2 which has been in the top dead center stopped state is lowered. Then, in step 102 (PSDI activating means 24), the controller 13 receives the light shielding signal from the light beam type safety device 4, and determines whether or not the light is blocked during the process in which activation cannot be accepted (here, during the descending process). If it is determined that the light is shielded, an emergency stop command is output in step 103 to stop the slide in an emergency. Also, in step 102, during a process in which activation cannot be accepted (for example,
If the light is not shielded during the descending stroke), the ascending stroke is entered in step 104, and the slide 2 is raised. Further, in step 105, a top dead center stop process is started, and the slide 2 is stopped at the top dead center.

Next, in step 106, the operator performs an optical axis light shielding operation (break) by trial. Note that this light-shielding operation is performed from the ascending stroke of Step 104 to Step 10.
It can be executed at any time up to the top dead center stop process. Then, at step 107 (light beam type safety device signal input means 20), the controller 13 determines whether or not the light-shielding operation has been performed between the rising stroke and the top dead center stop stroke. Returns to step 106 and waits until the light shielding operation is performed.
08.

In step 108 (light beam safety device signal input means 20), the position and the number of light-shielded optical axes (light-shielded state signal) are obtained based on the light-shielded signal of the light beam-type safety device 4. Setting means 10) The position and the number of the light-shielded optical axes are taken in, and the adjacent light-shielded optical axis range (that is, the start range) is obtained. Thereafter, in step 110 (starting range setting means 10), it is checked whether or not the first shot completion flag has been set. If it has not been set (first shot), the process proceeds to step 111, and if it has been set, Goes to step 115 (from the second shot).

In step 111 (start range setting means 1)
0), the controller 13 calculates the activation range by adding the permissible value to the obtained light shielding optical axis range. And step 1
At 12 (starting range setting means 10), shading setting capturing means 21
, The calculated start range data is fetched. Here, when the light-shielding setting capturing means 21 is a rotary cam device or a slide position detecting means, the capturing is performed at a predetermined position such as a rising stroke or a top dead center stop process. Is captured when is operated. Next, step 113
(Activation range storage means 22), and the controller 13 stores the acquired activation range data. At this time, the information is stored in a predetermined memory area corresponding to the worker ID number specified by the worker identification unit 11. Then, after setting the first shot completion flag in step 114, step 10
Returning to step 6, the above process is repeated.

The controller 13 reads out the stored start-up range corresponding to the worker specified by the worker specifying means 11 at step 115 (start-up range comparison / judgment means 23). Step 10
It is determined whether or not the light-shielded optical axis range obtained in step 9 is within the stored activation range. If not, the process proceeds to step 103 to perform an emergency stop. Returning to step 100, a start command is output to the press start circuit 14, and (PSDI start means 24) starts the press automatically.

As described above, during the pressing operation of the first shot, the starting range is automatically set by teaching, and after the second shot, only during the light-shielding operation within the set starting range, Startup is possible. Therefore, even if the operator accidentally shades the outside of the activation range with the head, shoulder, or the like, the emergency stop without counting as a break prevents the press machine 1 from being unexpectedly activated.
As a result, activation by the PSDI based on the significance of the worker becomes possible, so that the degree of fatigue of the worker is reduced. In addition, since the PSDI operation can be performed within the activation range suitable for the worker's aptitude, the work can be performed without difficulty. Furthermore, if the press process (that is, the slide position) is shielded from light when it is not in the range in which activation can be performed, for example, the ascent process or the top dead center,
Since automatic activation by PSDI is not performed, safety is improved.

Next, a second embodiment will be described with reference to FIGS.
It will be described based on. The present embodiment shows an example in which the setting of the activation range is manually set by the activation range setting switch. Therefore, here, the activation range setting means 10
Structures other than the above are the same as those of the first embodiment, and therefore, are denoted by the same reference numerals as in FIG.

FIG. 6 is a block diagram showing a hardware configuration according to this embodiment. The activation range setting switch 30 is a switch that allows the operator to directly input and set activation range data. For example, the optical axis position (optical axis A, B
Or an optical axis position input switch for inputting an optical axis position data) and a capture switch for capturing the input optical axis position data. Then, the acquired optical axis position data is output to the controller 13.

The controller 13 includes a start range setting switch 30
The activation range is obtained based on the optical axis position data input from the CPU, and the activation range data is stored in a predetermined area in the memory corresponding to the worker ID number designated by the worker identifying means 11. At the time of press work, it is determined whether the process is a predetermined process that can be started based on an output signal from the press process determining unit 12, and if the process can be started, the process is based on a light-shielded signal from the light beam safety device 4. It is checked whether the obtained light shielding position is within the stored start range, and if it is within the start range, a start command is output to the press start circuit 14.

FIG. 7 is a functional configuration block diagram according to the present embodiment. The light beam safety device signal input means 20 receives a light blocking signal for each optical axis from the light beam safety device 4 and outputs a light blocking state signal of all light axes to the activation range comparison / determination means 23. In the start range setting mode, the start range setting means 10 obtains start range data based on the optical axis position data captured by the start range setting switch 30 and outputs the start range data to the start range storage means 22.

The activation range storage means 22 stores activation range data from the activation range setting means 10 in association with the worker identification signal from the worker identification means 11 in the activation range setting mode. The activation range data corresponding to the operator identification signal specified at the time of the press operation is output to the activation range comparison and determination means 23. Activation range comparison determination means 23
Compares the input light-blocking state signal with the start-up range data during a press operation, and outputs a start-up command to the PSDI starting-up means 24 when the light-shielded optical axis position is within the start-up range.

The press-stroke determining means 12 determines where the current press-stroke is based on the detection signal from the press-stroke detecting means 16, and outputs a result of the determination to the activation acceptability determining means 25. Further, the activation acceptability determination means 2
5 checks this determination result, and outputs a start permission command to the PSDI starting means 24 when the start is acceptable, and does not output the start permission command when the start is impossible. Then, only when the PSDI activation means 24 inputs this activation permission command, the PSDI activation means 2
The slide 2 is started based on the start command from the control unit 3. If the start permission command is not input, the slide 2 is kept stopped even if the start command is input.

The processing flowchart in the above configuration is as follows.
This is substantially the same as the flowchart shown in FIGS. However, since the setting of the activation range is performed not by teaching but by the activation range setting switch 30, the processing of steps 110 to 114 becomes unnecessary. Therefore, the same applies to step 109 from the first shot onward.
To determine the light-shielded optical axis position, and then proceed to step 115,
The stored activation range is read out, and the two can be compared in step 116.

As described above, the activation range setting means 1
0 is provided with a start range setting switch 30, and the operator can directly input and set the start range by using the start range setting switch 30. The activation range data is stored corresponding to each worker, and it is checked whether or not activation by PSDI is possible based on the activation range data corresponding to the actual worker during the press work. As a result, even if the worker accidentally shields the outside of the activation range with his / her head or shoulder, unintentional activation by the operator is eliminated, so that fatigue and stress of the operator are reduced, and the activation range suitable for the operator is reduced. The PSDI operation can be performed on the PC, so the work can be done without difficulty. Further, setting and changing of the activation range are facilitated, and operability at the time of setting the activation range is good. In addition, if the press process (that is, the slide position) is shielded from light when it is not in the range in which activation can be performed, for example, during the ascending process or at the top dead center, the automatic activation by PSDI is not performed, thereby improving safety.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of setting of a starting range of a sensitive press starting device according to the present invention.

FIG. 2 is a block diagram of a hardware configuration according to the first embodiment of the present invention.

FIG. 3 is a functional block diagram of a first embodiment according to the present invention.

FIG. 4 is a processing flowchart example (first half) of the first embodiment according to the present invention.

FIG. 5 is an example (second half) of a processing flowchart of the first embodiment according to the present invention.

FIG. 6 is a block diagram of a hardware configuration according to a second embodiment of the present invention.

FIG. 7 is a functional configuration block diagram of a second embodiment according to the present invention.

FIG. 8 is an external perspective view of a press machine provided with the light beam type safety device.

FIG. 9 is an explanatory view of a light beam curtain of the light beam type safety device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine 2 Slide 3 Work area 4 Light beam safety device 4a Emitter 4b Light receiver 10 Activation range setting means 11 Worker identification means 12 Press stroke determination means 13 Controller 14 Press activation circuit 16 Press stroke detection means 20 Light beam safety device Signal input means 21 Light-shielding setting capturing means 22 Activation range storage means 23 Activation range comparison and determination means 24 PSDI activation means 25 Activation acceptability determination means 30 Activation range setting switch

Claims (9)

[Claims] 1. A slide (2) which is provided at an entrance of a work surface where an operator's hand or material enters the work area of the slide (2) and which detects light shielding by an intruding object to move the slide (2) in operation. In a sensitive press starting device for automatically starting a press machine (1) based on a light blocking signal of each optical axis of a light beam safety device (4) for emergency stop and a subsequent recovery signal, the press machine (1) A starting range setting means (10) for setting a specific light shielding range of the optical axis of the light beam safety device (4) capable of automatic starting as a starting range, and a starting range storage means (22) for storing the set starting range. )
It is checked whether or not the light-blocking range obtained based on the light-blocking signal of each optical axis input from the light beam type safety device (4) is within the stored start-up range. When the determination is made, a response range comparison / determination means (23) for outputting a start command and a PSDI starting means (24) for automatically starting the press machine 1 based on the start command are provided. Press starter. 2. The responsive press starting device according to claim 1, wherein the starting range setting means (10) comprises the light beam type safety device (4).
A light-shielding setting capturing means (21) for instructing a timing of capturing a light-shielding signal of each optical axis from the optical axis, and receiving the capturing timing command from the light-shielding setting capturing means (21), A sensitive press starting device, wherein the light shielding range is obtained and set based on a light shielding signal. 3. The responsive press starting device according to claim 2, wherein the light-shielding setting taking-in means (21) sends the taking-in timing command when the position of the slide (2) is within a predetermined press stroke. One of a rotary cam device that outputs a position signal of the slide (2), a slide position detecting means that outputs the position signal of the slide (2) to instruct the capture timing, and a capture switch that outputs a capture timing command by manual operation. Responsive press starter. 4. The responsive press starting device according to claim 1, wherein the starting range setting means (10) is capable of directly setting an optical axis position of the starting range.
A responsive press starting device, characterized in that: 5. The responsive press starting device according to claim 1, wherein a press stroke determining means for determining a current press stroke based on a position of the slide, and a press stroke determining means. ) Is determined based on the determination result, whether or not the current press process is a process that can be activated.
A start acceptability determining means (25) for outputting a start permit command when the start accepting process is possible, and based on a start command from the start range comparison determining means (23) only when the start permit command is input. And a PSDI starting means (24) for automatically starting the press machine 1. 6. The responsive press activation device according to claim 5, wherein the activation acceptability determination means (25) is capable of accepting activation when the slide (2) is in a rising stroke or a top dead center stop stroke, In addition, a sensitive press starting device is characterized in that the start cannot be accepted during the descending stroke of the slide (2) and the press is emergency stopped. 7. The responsive press activation device according to claim 1, wherein said activation range storage means (22) is capable of storing said activation range in correspondence with each worker. When the activation range storage means (22) stores the activation range or reads out the stored activation range, the activation range storage means (22) outputs a worker identification signal for identifying an operator. A responsive press starter, comprising an operator specifying means (11). 8. A slide (2) which is provided at an entrance of a work surface where an operator's hand or material enters the work area of the slide (2), and detects light shielding by an intruding object to move the slide (2) during operation. A starting method of a sensitive press starting device for automatically starting a press machine (1) based on a light blocking signal of each optical axis of a light beam safety device (4) for emergency stop and a subsequent recovery signal, comprising: A specific optical axis range is set in advance as an activation range among all the optical axes of (4), and data of this activation range is stored, and during the press work, the light shielding signal of the light beam type safety device (4) is Comparing the optical axis position with the stored activation range, and activating the press machine (1) when the optical axis position of the light blocking signal is within the stored activation range. How to activate the press activation device. 9. The starting method of a sensitive press starting device according to claim 8, wherein the specific optical axis range as the starting range is determined by actually feeding the light beam of the light beam type safety device (4) into the material. A method of starting a sensitive press starting device, wherein the position is set by teaching a light-shielded position or a light-shielded position by an operation of an operator.