JP3741498B2 - A device for limiting the number of press strokes of a sensitive press starter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety device that limits the number of press strokes of a sensitive press activation device (hereinafter referred to as PSDI) that automatically activates a press machine based on light shielding and recovery of the light beam safety device 7.
[0002]
[Prior art]
Conventionally, in order to prevent accidents when an operator's hand is inserted into the slide work area while the press machine is operating, a light safety device has been installed at the entrance to the slide work area from the outside. Yes. And in a specific press machine, there is a thing using this beam type safety device for an automatic starting device. That is, in order to automate the press work, a PSDI is installed that detects that the light shielding of the light safety device has been restored in one cycle of the press work and automatically starts the press machine.
FIG. 5 is a perspective view showing an example of a press machine equipped with such a light safety device, and the PSDI will be described below with reference to FIG.
[0003]
A bolster 2 is provided at the lower part of the press machine 1, and a lower die 3 is disposed on the upper surface of the bolster 2. In addition, a slide 4 is provided at an upper portion of the press machine 1 and at a position facing the bolster 2 so as to be movable up and down, and an upper mold 5 is disposed on the lower surface of the slide 4 so as to face the lower mold 3. Has been placed. Then, the work area 6 in which the slide 4 moves up and down is set as a dangerous area, and the work area is such that it cannot enter from the outside except the work surface on which the worker works (usually, the front surface of the press machine 1). 6 is surrounded by a guard or the like. A light beam safety device 7 is disposed on the left and right of the entrance of the work surface. The light beam safety device 7 includes a light projector 7a and a light receiver 7b facing each other.
[0004]
In the normal projector 7a, light emitting elements are arranged at a predetermined interval A in the vertical direction, and in the light receiver 7b, light receiving elements are arranged in the vertical direction at the same predetermined interval A as the light emitting elements.
[0005]
In addition, as shown in FIG. 6, a light curtain is formed at the entrance of the work surface in a state where the light emitted from the projector 7a is received by the light receiver 7b. The entry of the press machine 1 shown in FIG. 5 into the dangerous area is detected by shielding an object (such as an operator's hand) from light. And when the controller which is not illustrated inputs this detection signal of the beam type safety device 7, if the slide 4 is in operation, the slide 4 is emergency stopped to prevent an accident.
[0006]
On the other hand, in the PSDI using the light safety device 7 as described above, when the material is set on the lower mold 3 by the hand of the operator, the light curtain at the entrance of the work surface shown in FIG. After the material is set on the lower mold 3, the shading of the light curtain is restored when the operator's hand is retracted outside the light curtain (this is called a break). When a control device (not shown) detects that the light curtain has been shielded, the press machine is automatically started. This causes the press machine to automatically operate in conjunction with the operator's work. We are trying to improve work efficiency. The above work example is for one break, but even in the case of two breaks in which the product pressed with the other hand is taken out, the number of breaks after the last light-blocking recovery in one cycle of the press work The press machine automatically starts counting.
[0007]
[Problems to be solved by the invention]
However, the conventional automatic starting method of the press machine by PSDI using the light safety device 7 has the following problems.
(1) If the automatic start-up operation by PSDI is continued, the worker becomes enthusiastic because he / she is enthusiastic about the work, and the worker himself / herself is in the cycle time of the press work, that is, the time interval between the respective automatic start points ( Hereinafter, it is often impossible to control the tact time). As a result, the tact time is gradually shortened, and the work speed must be made faster than the allowable cycle time, so that the worker's fatigue level increases.
(2) Usually, in the case of a mechanical press, the clutch and brake are designed based on the working speed (the number of strokes per unit time) when the clutch and brake are started by manually pushing the operation button or the like. . Therefore, when the tact time is extremely shortened by the automatic starting operation by PSDI, the degree of wear of the clutch and the brake becomes intense. As a result, there arises a problem that durability and reliability of the clutch and the brake are lowered.
[0008]
The present invention has been made paying attention to the above-mentioned problems, and reduces the number of press strokes of a sensitive press starter that reduces the fatigue level of the operator and improves the durability and reliability of the press machine. The object is to provide a device.
[0009]
[Means, actions and effects for solving the problems]
  In order to achieve the above object, the invention according to claim 1 is directed to the work area 6 of the slide 4 by the operator.orIs materialAt least one ofIn the press stroke number limiting device of the sensitive press activation device that automatically activates the press machine 1 by detecting the light shielding of the light beam safety device 7 provided at the entrance of the work surface invading and the subsequent recovery, Based on the light shielding and recovery signal of the light safety device 7, the tact time detection means 11 for detecting the tact time of the press work and the tact time detection value t detected by the tact time detection means 11 are stored in advance. A minimum limit value judging means 13 for outputting at least one of a warning command or a press stop command and a warning means 16 for issuing a warning by the warning command from the minimum limit value judging means 13 A configuration including at least one of press activation means 21 for stopping the press machine 1 by the press stop command; To have.
[0010]
According to the first aspect of the present invention, the tact time, that is, the time between the automatic start points of the press is detected by the tact time detection means 11 based on the light shielding and recovery signal of the light safety device 7. Then, the minimum limit value judging means 13 compares the tact time detection value t with a previously stored minimum limit value T0, and when the tact time detection value t is less than the minimum limit value T0, a warning command or a press stop command is issued. Output one of them. The warning means 16 issues a warning by an alarm or display based on the warning command, and / or the press activation means 21 stops the press machine 1 based on the press stop command.
As a result, even in the case of automatic start-up operation using PSDI, if the tact time becomes early, a warning is issued to the operator to alert the operator and the press machine is automatically stopped. Can be reduced. In addition, durability and reliability of the clutch and brake in the mechanical press can be improved.
[0011]
The invention according to claim 2 is the press stroke number limiting device of the sensitive press activation device according to claim 1,
Both the warning means 16 and the press activation means 21, and
The minimum limit value T0-1 when the minimum limit value judging means 13 outputs the warning command to the warning means 16 is the minimum limit value T0-2 when the press stop command is output to the press starting means 21. It is characterized by being larger.
[0012]
According to the invention described in claim 2, the minimum limit value judging means 13 stores the minimum limit values T0-1 and T0-2 set in advance as "T0-1> T0-2", The tact time detection value t is compared with these minimum limit values T0-1 and T0-2. First, a warning command is output when the tact time detection value t is less than or equal to the minimum limit value T0-1, and further, a press stop command is output when the tact time detection value t is less than or equal to the minimum limit value T0-2. .
Therefore, since the worker can recognize that the tact time of the work is increased by the warning first, there is a room for delaying the tact time by the PSDI, and the worker ignores the warning and the tact time is further increased. Even if it becomes faster, the press machine can be brought to an emergency stop. Therefore, since it is possible to reliably prevent the tact time from becoming a predetermined limit value or less, it is possible to reduce the fatigue level of the operator and to improve the durability and reliability of the clutch and brake in the mechanical press.
[0013]
According to a third aspect of the present invention, in the press stroke number limiting device of the sensitive press activation device according to the first aspect, the state in which the tact time detection value t is equal to or less than the minimum limit value T0 is When the number of consecutive shots occurs for each successive shot, the over number accumulating means 14 for accumulating the number of consecutive shots as the over number n, and when the over number n is greater than or equal to a pre-stored warning set value N1, the warning means 16 Warning determination means 15 for outputting the warning instruction, or first emergency stop for outputting the press stop instruction to the press activation means 21 when the over frequency n is not less than a first emergency stop set value N3 stored in advance. The determination unit 20 includes at least one of them.
[0014]
According to a third aspect of the present invention, when the state where the tact time detection value t is less than or equal to the minimum limit value T0 occurs for each successive shot, the over number integration means 14 determines the number of over shots. Accumulate as n. The warning determination means 15 outputs the warning command to the warning means 16 when the accumulated number of times n is greater than or equal to the warning setting value N1 stored in advance, and the warning means 16 warns the operator based on this warning command. To emit. Further, the first emergency stop determination means 20 outputs a press stop command to the press activation means 21 when the over frequency n is equal to or greater than the first emergency stop set value N3 stored in advance, thereby causing the press machine 1 to emergency stop. .
Therefore, even in the automatic start-up operation by PSDI, if the number of consecutive shots in which the tact time is less than or equal to a predetermined limit value exceeds the predetermined number, a warning is issued to the operator to alert the operator. Since the press machine is automatically stopped, the fatigue level of the operator can be reduced. In addition, durability and reliability of the clutch and brake in the mechanical press can be improved.
[0015]
According to a fourth aspect of the present invention, in the press stroke number limiting device of the sensitive press starter according to the third aspect, the tact time detection value t becomes larger than the minimum limit value T0, and the over frequency integrating means 14 After the over number n to be integrated is reset, when the over number n again becomes equal to the warning set value N1, the integration determination means 17 for outputting a warning number integration command, and the integration determination means 17 from the integration determination means 17 The warning number integrating means 18 for adding the warning number m by the integration command, and the press stop instruction for outputting the press stop instruction to the press starting means 21 when the integrated warning number m is not less than the second emergency stop set value N2. 2 emergency stop determination means 19 is provided.
[0016]
According to the fourth aspect of the present invention, after the tact time detection value t becomes larger than the minimum limit value T0 and the overtime number n is reset, the integration number determination unit 17 again sets the overtime number n to the warning set value. When it becomes equal to N1, a warning count integration command is output to the warning count integration means 18. The warning frequency integration means 18 integrates the warning frequency m based on this integration command, and the second emergency stop determination means 19 activates the press when the integrated warning frequency m is equal to or greater than the second emergency stop set value N2. The press stop command is output to the means 21 to stop the press machine 1.
Therefore, even if the state where the tact time detection value t is not more than the minimum limit value T0 does not continue until the emergency stop of the press machine, there is a tendency for the tact time to exceed when the warning count m reaches a predetermined number. Therefore, the press machine can be brought to an emergency stop. As a result, before the emergency stop of the press machine, the operator can recognize that the tact time has been shortened by a warning, and if the tact time is returned within the normal range, the press work can be continued. Efficiency can be improved. Even if the warning operation is ignored and the press operation is performed, the press machine is automatically stopped when the warning number m reaches a predetermined number, so that the fatigue of the operator is reduced and the durability of the clutch and brake in the mechanical press is reduced. Reliability can also be improved.
[0017]
The invention according to claim 5 is the press stroke number limiting device of the sensitive press activation device according to claim 3,
The warning set value N1 is smaller than the first emergency stop set value N3.
[0018]
According to the invention as set forth in claim 5, since the allowable number of times over which the warning n is generated (warning set value N1) is smaller than the allowable number of emergency stops (first emergency stop set value N3), the press is performed after the warning. The machine 1 will stop. Therefore, since the worker can recognize that the tact time of the work is increased by the warning first, there is a room for delaying the tact time by the PSDI, and the worker ignores the warning and the tact time is further increased. Even if it becomes faster, the press machine can be brought to an emergency stop. Therefore, since it is possible to reliably prevent the tact time from becoming a predetermined limit value or less, it is possible to reduce the fatigue level of the operator and to improve the durability and reliability of the clutch and brake in the mechanical press.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In addition, since the structure of the press machine 1 is the same as the said FIG. 5, it abbreviate | omits in the following description.
FIG. 1 is a hardware configuration diagram of a PSDI press stroke number limiting device according to an embodiment of the present invention. The light beam safety device 7 outputs a light blocking detection signal and a recovery signal to the controller 8 when the light beam between the projector 7a and the light receiver 7b shown in FIGS.
[0020]
  In the press activation means 21The press activation circuit 9 is a circuit that controls activation and deactivation of the press machine 1, and controls a drive device (not shown) of the slide 4 based on an activation instruction and a stop instruction from the controller 8. The drive device for the slide 4 may be a drive motor for a crank rotation shaft of a mechanical press, or a hydraulic cylinder or a direct drive motor for a direct drive press.
  Also,In the warning means 16The warning device 10 warns based on a warning command from the controller 8, and is constituted by an alarm device such as a buzzer and / or a display device such as a lamp, a patrol light, or a character display device.
[0021]
  The controller 8 is composed of, for example, a microcomputer and processes based on the light-shielding detection signal and the recovery signal input from the light beam safety device 7,Of the press activation means 21A startup command and a stop command are output to the press startup circuit 9 to control the PSDI. Also, the tact time is measured by PSDI, and when this tact time exceeds the allowable value and becomes abnormal, a warning is given.Mean 16A warning command is output to.
[0022]
Next, a functional configuration block diagram of an embodiment according to the present invention will be described based on FIG.
The beam-type safety device 7 installed in front of the work area 6 of the slide 4 detects light shielding by the operator's hand or material and subsequent recovery, and outputs this light shielding and recovery signal. The tact time detection means 11 detects the tact time based on the light shielding and recovery break signal input from the light safety device 7, and uses the tact time detection value t as the maximum limit value determination means 12 and the minimum limit value determination means 13. Output to. The tact time detection value t is based on the break signal from the light beam safety device 7 and is a timer from the time when the last break signal was automatically started last time to the time when the last break signal was input this time. Is measured and detected. Note that the measurement of the tact time detection value t is not limited to this, and for example, it can be obtained as a difference between the last break signal input times.
[0023]
The maximum limit value determination means 12 determines whether or not the tact time detection value t input from the tact time detection means 11 is greater than or equal to the previously stored maximum limit value T1, and if so, issues a press stop command to the press activation circuit 9. Output. Further, the minimum limit value judging means 13 judges whether or not the inputted tact time detection value t is less than or equal to a previously stored minimum limit value T0. Output to. Here, the over number represents the number of continuous shots of the press when the state where the tact time detection value t is equal to or less than the minimum limit value T0 continuously occurs.
[0024]
  Further, when the above integration command is input, the over-count integrating means 14 adds 1 to the over-number n and integrates it, and then adds the integrated over-number n to the warning determining means 15, the integration determining means 17, and the first emergency stop. It outputs to the determination means 20. When PSDI is activated for the first time, the over frequency n is reset by initialization. The warning determination means 15 determines whether or not the input number of times n is greater than or equal to a warning setting value N1 stored in advance, and outputs a warning command to the warning means 16 in the above case. And the warning means 16 is based on this warning command.By alarm device 10A warning is given to the worker by an alarm or display.
[0025]
Further, the integration determining means 17 determines whether or not the inputted over number n is equal to the warning set value N1 stored in advance, and outputs the warning frequency integration command to the warning frequency integrating means 18 when they are equal. The warning frequency integration means 18 adds 1 to the warning frequency m based on the input integration command and integrates it, and outputs the integrated warning frequency m to the second emergency stop determination means 19. The number of times of warning m continuously occurs when the tact time detection value t is less than or equal to the minimum limit value T0, that is, when the tact time is faster than the allowable value, and is greater than or equal to the warning set value N1. The case is integrated once. Therefore, when a state occurs in which the tact time detection value t is greater than the minimum limit value T0, the over frequency n is reset here, and the continuous number of times in which the tact time detection value t is less than the minimum limit value T0 is counted again. Then, when the warning set value N1 is exceeded again, the number of warnings m is counted as described above. Then, the second emergency stop judging means 19 judges whether or not the inputted warning number m is greater than or equal to a second emergency stop set value N2 stored in advance, and if so, a press stop command is sent to the press starting means 21. Output.
[0026]
The first emergency stop determination means 20 determines whether or not the input number of times n is greater than or equal to a first emergency stop set value N3 stored in advance, and if so, a press stop command is sent to the press activation means 21. Output. Here, the first emergency stop set value N3 is set to be larger than the warning set value N1, and the tact time value t is not changed even if the over number n exceeds the warning set value N1 and a warning is given to the operator. If it is not corrected and the warning state continues and the number of times n exceeds the first emergency stop set value N3, an emergency stop is performed.
When the press activation means 21 receives a press stop command from the maximum limit value determination means 12, the second emergency stop determination means 19, and the first emergency stop determination means 20, the press activation means 21 stops the drive device of the slide 4. The press machine 1 is brought to an emergency stop.
[0027]
  Next, based on FIG. 3 and FIG. 4, an example of a control flowchart of the press stroke number limiting device of the sensitive press activation device according to the embodiment of the present invention will be described. In the following flowchart, each processing number is indicated with S. In addition, it is assumed that the PSDI mode is selected in advance.
  First, in S1, the controller 8 resets the over number n (in the over number integrating unit 14) and the warning number m (in the warning number integrating unit 18) by initialization, and then in S2In the press activation means 21A start command is output to the press start circuit 9 to operate the press machine..Next, in S3, the light beam safety device 7 blocks and recovers the predetermined light beam in the press ascending process, and the controller 8 inputs this light blocking and recovery signal (tact time detection means 11). In S4, the controller 8A command signal is output to the press activation means 21Stop slide 4 of press machine 1 at top dead center.
[0028]
Next, in S5, the tact time detection value t is measured based on the shading and recovery signal input in S3 (tact time detection means 11), and in S6, the controller 8 stores the minimum limit value T0 stored. The maximum limit value T1 (in the maximum limit value determination means 12) is read out (in the minimum limit value determination means 13). Thereafter, in S7, the tact time detection value t measured in S5 is compared with the read maximum limit value T1, and if the tact time detection value t is equal to or greater than the maximum limit value T1, the tact time is exceeded, that is, the operator Is determined not to continue the work (maximum limit value determining means 12). When the tact time is over, the PSDI mode is canceled in S8 so that subsequent restarts by PSDI are not accepted, and in S9, a press stop command is output to the press activation means 21 to make the press machine 1 emergency. Stop.
[0029]
  If the tact time detection value t is smaller than the maximum limit value T1 in S7, the process proceeds to S10 to determine whether or not the tact time detection value t is equal to or less than the minimum limit value T0 (minimum limit value determination means). 13). If the tact time detection value t is larger than the minimum limit value T0, the over number n is reset in S11 (over number integrating means 14), the process returns to S2 and the above processing is continued. When the tact time detection value t is less than or equal to the minimum limit value T0 in S10, the process proceeds to S12, where the over number n is increased by 1 and integrated (over number integration means 14). Next, in S13, the warning set value N1 stored in advance is read. In S14, it is determined whether or not the number of overtime n is equal to or greater than this warning set value N1 (warning determination means 15). When it is smaller than N1, the process returns to S2 and the above processing is continued. In S14, if the over frequency n is greater than or equal to the warning set value N1, the warning is issued in S15.Mean 16Output a warning command toActivate the warning device 10To S16.
[0030]
  Next, in S16, it is determined whether or not the over-number n and the warning set value N1 are equal (integration determination means 17). If they are equal, the warning number m is increased by 1 in S17 (warning-number integration means). 18) Further, in S18, after reading the second emergency stop set value N2 stored in advance as an allowable value for the number of warnings m, in S19, whether the number of warnings m is equal to or greater than the second emergency stop set value N2. (Second emergency stop determination means 19). When the number of warnings m is equal to or greater than the second emergency stop set value N2, it can be determined that the warning condition has occurred intermittently, so the process proceeds to S22 and the press is started.Mean 21Press the stop command to stop the press machine 1.
[0031]
When the number of overtime n is not equal to the warning set value N1 in S16, or when the number of warnings m is smaller than the second emergency stop set value N2 in S19, the first emergency stop stored in advance in S20. The set value N3 is read, and in S21, it is determined whether or not the number of times n is greater than or equal to the first emergency stop set value N3 (first emergency stop determination means 20). In the above case, it is considered that the operator does not improve the tact time even though the tact time is over, and the process proceeds to S22 to stop the press machine 1 (press activation means 21). On the other hand, when the number of overtime n is smaller than the first emergency stop set value N3 in S21, the process returns to S2 and the above processing is continued.
[0032]
As described above, the continuous number (over number n) is counted when the tact time detection value t is less than the allowable minimum time (minimum limit value T0). First, the over number n is a warning set value. When N1 is reached, a warning is issued to alert the operator to improve the tact time. When the operator continues ignoring this warning and the overtime number n further reaches the first emergency stop set value N3, the press machine 1 is emergency stopped. In addition, when the above-mentioned warning is generated intermittently and reaches a predetermined number of times (first emergency stop set value N2), automatic activation by PSDI continues with the tact time being just below the minimum limit value T0. In this case, the press machine 1 is also brought to an emergency stop. As a result, the tact time can be maintained at the minimum limit value T0 or more, so that the durability and reliability of the clutch and brake can be improved.
[0033]
When the tact time detection value t is equal to or greater than the maximum allowable time (maximum limit value T1), it is considered that the operator does not intend to continue the work, the PSDI mode is canceled, and the press machine 1 is Emergency stop. This prevents automatic activation by PSDI against the operator's intention during a long press pause. As a result, the burden on the operator is reduced.
[0034]
In the above description, when the tact time detection value t continues below the minimum limit value T0, the continuous number is counted as the over number n, and the over number n is the allowable set value (warning set value). Depending on whether or not N1 or the first emergency stop set value N3) has been reached, the operator is warned or the press machine 1 is emergency stopped, but this is not limitative.
For example, by setting the allowable setting value of the count (the warning setting value N1 or the first emergency stop setting value N3) as one time, when the tact time detection value t falls below the minimum limit value T0, immediately , Warning or emergency stop.
[0035]
Further, for example, instead of accumulating the number of times n, the minimum limit value judging means 13 shown in FIG. Each of the minimum limit values T0-2 is set in advance, and when the tact time detection value t falls below these minimum limit values T0-1 and T0-2, an operator is warned. The press machine 1 may be brought to an emergency stop. In this case, the minimum limit value T0-1 when the warning command is output is set larger than the minimum limit value T0-2 when the press stop command is output. As a result, when the tact time detection value t gradually decreases, a warning is first issued to alert the worker, and then the worker ignores this warning and further detects the tact time detection value. When t becomes small, the press machine 1 can be stopped in an emergency, so that danger can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hardware configuration according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of an embodiment according to the present invention.
FIG. 3 is an example of a control flowchart (first half) according to an embodiment of the present invention.
FIG. 4 is an example of a control flowchart (second half) according to an embodiment of the present invention.
FIG. 5 is a perspective view showing an embodiment of a press machine provided with a light beam safety device.
FIG. 6 is an explanatory diagram of a light curtain of the light safety device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Press machine, 2 ... Bolster, 3 ... Lower metal mold, 4 ... Slide, 5 ... Upper metal mold, 6 ... Working area, 7 ... Light safety device, 7a ... Light projector, 7b ... Light receiver, 8 ... Controller DESCRIPTION OF SYMBOLS 9 ... Press start circuit, 10 ... Warning device, 11 ... Tact time detection means, 12 ... Maximum limit value judgment means, 13 ... Minimum limit value judgment means, 14 ... Over frequency integration means, 15 ... Warning judgment means, 16 ... Warning means, 17 ... accumulation determination means, 18 ... warning frequency integration means, 19 ... second emergency stop determination means, 20 ... first emergency stop determination means, 21 ... press activation means.

Claims (5)

The work area 6 of the slide 4 is also the operator's hand is detected and shading of the light beam of the light beam safety device 7 in which at least one is provided at the entrance of the work surface to penetrate the material, the subsequent recovery, the press machine 1 In the press stroke number limiting device of the sensitive press starter that automatically starts
A tact time detecting means 11 for detecting a tact time of the press work based on the light shielding and recovery signal of the light safety device 7;
When the tact time detection value t detected by the tact time detection means 11 is less than or equal to the previously stored minimum limit value T0, the minimum limit value determination means 13 that outputs at least either a warning command or a press stop command;
At least one of warning means 16 for issuing a warning in response to the warning command from the minimum limit value determining means 13 and press activation means 21 for stopping the press machine 1 in response to the press stop command is provided. A device for limiting the number of press strokes of a sensitive press activation device. In the press stroke number limiting device of the sensitive press activation device according to claim 1,
Both the warning means 16 and the press activation means 21 are provided,
The minimum limit value T0-1 when the minimum limit value judging means 13 outputs the warning command to the warning means 16 is the minimum limit value T0-1 when the press stop command is output to the press starting means 21. -2 A press stroke limit device for a sensitive press starter characterized by being larger than that. In the press stroke number limiting device of the sensitive press activation device according to claim 1,
An over number integrating means 14 for integrating the number of consecutive shots when the state where the tact time detection value t is equal to or less than the minimum limit value T0 occurs for each successive shot of the press as an over number n;
Warning determination means 15 for outputting the warning command to the warning means 16 when the number of overtime n is greater than or equal to a preset warning set value N1, or a first emergency stop setting value for which the number of overtime n is stored in advance The number of press strokes of the sensitive press activation device, comprising at least one of the first emergency stop determination means 20 for outputting the press stop command to the press activation means 21 when N3 or more. Restriction device. In the press stroke number limiting device of the sensitive press activation device according to claim 3,
After the tact time detection value t becomes larger than the minimum limit value T0 and the over number n accumulated by the over number accumulation means 14 is reset, the over number n again becomes equal to the warning set value N1. , Integration determination means 17 for outputting a warning count integration command;
In accordance with the integration command from the integration determination unit 17, a warning number integration unit 18 that integrates the warning number m;
Sensitive type, comprising: a second emergency stop judging means 19 for outputting the press stop command to the press starting means 21 when the accumulated number of warnings m is equal to or greater than a second emergency stop set value N2. Press stroke limit device for press activation device. In the press stroke number limiting device of the sensitive press activation device according to claim 3,
The warning set value N1 is smaller than the first emergency stop set value N3.

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