JP2013218674A - Stroke end timer setting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately set a delay time from detection by detection means corresponding to a forward end position and a backward end position, respectively, provided in a moving path where a moving body such as a work reciprocates, by means of a stroke end timer setting device.SOLUTION: A stroke end timer setting device comprises a timer, a forward end sensor, a backward end sensor and a computation section. The forward end sensor installed in a position P3 on the moving path and the backward end sensor installed in a position P4 are set in such a manner that a piston (moving body) moves forwards and backwards on a moving path in which a forward end position P1 and a backward end position P2 are set. The computation section calculates a first delay time t3 and a second delay time t6.

Description

  The present invention relates to a stroke end timer setting device.

  Conventionally, various sensors detect that an operating part (hereinafter referred to as a moving body) of an actuator such as a cylinder has arrived at a predetermined forward end position.

  Similarly, it is detected by various sensors that the moving body has arrived at a predetermined backward end position.

  For example, the above-mentioned sensor detects that the moving body has moved forward and hit the end position, but the sensor may not detect the moving body at the moment the moving body actually hits because there are individual differences in the sensors. It can happen.

  Therefore, normally, the sensor is installed so that the detection by the sensor is performed before the moving body actually hits, and it is determined that the moving body has actually hit after waiting for a predetermined time after the detection by the sensor. ing.

  This predetermined time is a so-called delay time, and this delay time corresponds to a slight displacement such that the sensor continues to detect the moving body, and is a very short time of less than 1 second (Patent Document). 1).

Japanese Unexamined Patent Publication No. Sho 63-219884

  However, if the delay time is set to be shorter than necessary, there is a risk that an erroneous determination will be made that the moving object has hit before it actually hits. May cause troubles such as confusion in the process.

  For this reason, the delay time tends to be set longer than necessary.

  Here, even if the delay time is an extremely short time, the accumulated amount of the delay time becomes a large time, which may affect the manufacturing cost.

  The problem described above is not a problem that occurs only when the end position where the moving body stops is the position where the moving body physically hits.

  That is, for example, the moving body may be a piston that reciprocates within the cylinder, and the reciprocating range of the piston may be shorter than between the physical ends of the cylinder.

  That is, in the case where a stopper or the like for limiting the moving range of the piston is provided before the end of the cylinder and the end of the reciprocating moving range of the piston is used as a stopper, the piston is stopped by the stopper.

  Therefore, in this case, the end position in the moving path of the piston is not the end of the cylinder but the position of the piston stopped by the stopper.

  This is the same even if the space is connected to the chuck device of the machine tool.

  That is, for example, a chuck device in a machine tool grips and holds a work from the outer periphery, and the opening / closing operation of the gripping chuck member is performed by a hydraulic cylinder or an air cylinder connected to the chuck member.

  Although the piston reciprocates inside the cylinder, the piston does not necessarily reciprocate between the ends of the internal space of the cylinder, and may stop before the end of the cylinder, for example.

  That is, since the chuck member stops at the position where the workpiece is held, in this case, the stop position of the piston when the chuck member stops corresponds to the above-described end positions (forward end position, backward end position).

  The present invention has been made in view of the above circumstances, and appropriately shortens the delay time from detection by the detection means corresponding to the forward end position and the backward end position provided in the path for reciprocating the moving body as much as possible. It is an object of the present invention to provide a stroke end timer setting device that can be set.

  The stroke end timer setting device according to the present invention allows passage of the moving body in front of each end position corresponding to each of both end positions of the moving path along which the moving body reciprocates (position where the moving body stops). Two detection means provided to detect, and when the moving body moves from one end position toward the other end position, the detection is detected by the detection means after the moving body starts moving. A first time measuring means for measuring an elapsed time until it is performed, and a second time for measuring the time from when the moving body is detected by one of the detecting means until it is detected by the other detecting means. A time measuring means, a time measured by the first time measuring means and a second time measuring means on the forward path when the moving body reciprocates between both end positions of the moving path, and a return path; Before Based on the time measured by each of the first time measuring means and the second time measuring means, the moving body passes through the detection means corresponding to the end position on the downstream side in the movement direction in the forward path and the return path. And calculating means for calculating a delay time until reaching the end position on the downstream side in the moving direction.

  According to the stroke end timer setting device according to the present invention, from when the moving body is detected by the detecting means provided before the both end positions of the moving path for reciprocating the moving body, until the end position is actually reached. It is possible to appropriately set the delay time required for this as short as possible.

It is a block diagram which shows the stroke end timer setting apparatus which concerns on one Embodiment (Embodiment 1) of this invention. FIG. 2 is a schematic diagram for explaining the forward end position, the backward end position, the forward end sensor, the position of the backward end sensor, and the like on the movement path of the stroke end timer setting device shown in FIG. The output, (b) shows the output of the backward end sensor, (c) shows the elapsed time during forward movement, and (d) shows the elapsed time during backward movement. It is a figure which shows an example (the 1) of the specific aspect of a movement path | route. It is a flowchart (the 1) explaining the effect | action of a stroke end timer setting apparatus. It is a flowchart (the 2) explaining an effect | action of a stroke end timer setting apparatus. FIG. 6 is a flowchart for explaining the operation when the first delay time and the second delay time are determined by repeating the processes shown in FIGS. 4 and 5 a plurality of times. It is a block diagram which shows the stroke end timer setting apparatus which concerns on other embodiment (Embodiment 2) of this invention. It is a figure which shows the example of the operation panel provided with the mode selection switch.

  Embodiments of a stroke end timer setting device according to the present invention will be described below with reference to the drawings.

(Embodiment 1)
The stroke end timer setting device 100 according to this embodiment is configured such that a moving body moves on a moving path in which a forward end position P1 at which a forward moving body hits and stops and a backward end position P2 at which a backward moving body hits and stops are set. Is provided for a device that moves forward and backward, and as shown in FIGS. 1 and 2, a timer 10 that measures time, a forward end sensor 20 (detection means) installed at a position P3 on the movement path, The backward delay sensor 30 (detection means) installed at the position P4 on the movement path and the first delay from when the forward moving body is detected by the forward end sensor 20 until actually reaching the forward end position P1. A calculation unit 40 (calculation means) that calculates a second delay time t6 from the time t3 and the moving object that moves backward are detected by the backward end sensor 30 to the actual arrival of the backward end position P2. It is provided.

  The timer 10 and the calculation unit 40 are examples corresponding to the first time measuring means and the second time measuring means in the present invention.

  The forward end arrival determination unit 110 in FIG. 1 stores the first delay time t3 set by the calculation unit 40 described above, and the first delay time t3 after the moving body is detected by the forward end sensor 20. After the elapse of time, it is determined that the mobile body has reached the forward end position P1, and is used when the first delay time t3 set by the stroke end timer setting device 100 of the present embodiment is used.

  The same applies to the backward end arrival determination unit 120. The second delay time t6 set by the calculation unit 40 described above is stored, and the second delay time t6 after the moving body is detected by the backward end sensor 30 is stored. After the elapse of time, it is determined that the moving body has reached the backward end position P2, and is used when the second delay time t6 set by the stroke end timer setting device 100 of the present embodiment is used.

  Here, for example, as shown in FIG. 3, the moving path is a processing device that opens and closes a chuck that fixes a workpiece by a cylinder 81, and a piston 82 as a moving body that linearly reciprocates inside the cylinder 81. And the reciprocating path R1.

  In addition, as a mobile body, it is not limited to the thing of this illustration. Various moving routes can be applied according to the specific application of the moving body, and are not limited to the above-described examples.

  Various known timers can be used as the timer 10, and may be, for example, a pulse counter in which a pulse count value corresponds to time.

  As the forward end sensor 20 and the backward end sensor 30, for example, a non-contact sensor using magnetism, light, or the like, a limit switch that is a switch having a mechanical displacement portion, a proximity switch, a reed switch, or the like can be applied. .

  The position P3 where the forward end sensor 20 is installed is a position immediately before the advanced piston 82 stops at the forward end position P1, and is provided to detect the passage of the piston 82 before the forward end position P1. ing.

  As shown in FIG. 2A, the output of the forward end sensor 20 is at the L (low) level before the forward moving piston 82 reaches the position P3, and when the piston 82 passes the position P3, the output H ( The high level is switched, and thereafter the H level is maintained until the piston 82 reaches the forward end position P1.

  On the other hand, the position P4 where the retracting end sensor 30 is installed is a position immediately before the retracted piston 82 hits against the retracting end position P2 and stops, so that the passage of the piston 82 is detected before the retracting end position P2. Is provided. As shown in FIG. 2B, the output of the backward end sensor 30 is at the L level before the backward piston 82 reaches the position P4, and when the piston 82 passes the position P4, the output is switched to the H level. Thereafter, the H level is maintained until the piston 82 reaches the backward end position P2.

  The forward end sensor 20 and the reverse end sensor 30 have a predetermined detection width, and are arranged so that the detection ends are at the positions P3 and P4, and the forward end position P1 or the backward end position P2 is located within the detection range. Has been.

  As shown in FIG. 2 (c), the piston 82 moves forward at a substantially constant speed v1 from the backward end position P2 toward the forward end position P1, as shown in FIG. 2 (c), and moves forward as shown in FIG. 2 (d). It is driven to move backward from the end position P1 toward the backward end position P2 at a substantially constant speed v2.

  For driving the piston 82, a driving means using a solenoid valve can be applied.

  The forward end arrival determination unit 110 detects the elapsed time after detecting the piston 82 moving forward by the forward end sensor 20 by monitoring the time measured by the timer 10, and the elapsed time is preset. When the first delay time t3 is reached, it is determined that the piston 82 has reached the forward end position P1.

  The first delay time t3 set in advance at this time is determined by the calculation unit 40 by a calculation process described later, and is stored in a storage unit provided in the forward end arrival determination unit 110.

  Further, the backward end arrival determination unit 120 detects the elapsed time since the piston 82 moving backward by the backward end sensor 30 is detected by monitoring the time measured by the timer 10, and the elapsed time is set in advance. When the second delay time t6 is reached, it is determined that the piston 82 has reached the backward end position P2.

  The second delay time t6 set in advance is also obtained by the computing unit 40 by a computation process described later, and is stored in the storage unit provided in the backward end arrival determining unit 120.

  When the piston 82 advances the piston 82 from the backward end position P2 to the forward end position P1 at a substantially constant speed v1, the arithmetic unit 40 measures the backward end sensor measured by the timer 10 after the piston 82 starts from the backward end position P2. Elapsed time t1 until it is detected by 30, Elapsed time t2 from when the piston 82 is detected by the backward end sensor 30 until it is detected by the forward end sensor 20, the piston 82 from the forward end position P1 to the backward end position P2 When the piston 82 is moved backward at a substantially constant speed v2, an elapsed time t4 measured by the timer 10 from when the piston 82 departs from the forward end position P1 until it is detected by the forward end sensor 20, and the piston 82 is at the forward end sensor. 20 based on the elapsed time t5 from the detection by the backward end sensor 30 to the first delay time t3 and Calculating a second delay time t6.

  As a specific calculation method, the first delay time t3 is calculated according to the following equation (1), and the second delay time t6 is calculated according to the following equation (2).

  t3 = t2 × t4 / t5 (1)

  t6 = t1 × t5 / t2 (2)

  Here, for the departure signal S (timing corresponding to the start of movement of the moving body) when the piston 82 is advanced from the backward end position P2, for example, a configuration is adopted in which the piston 82 is advanced by a forward solenoid valve (drive device). In this case, the operation signal generated by the forward solenoid valve at the timing when the forward solenoid valve is operated can be applied.

  Therefore, in this case, the forward solenoid valve corresponds to a departure signal generator that generates the departure signal S.

  In addition, in the case of operating the forward solenoid valve by inputting an instruction (such as a start signal) for operating the forward solenoid valve, the instruction such as the start signal can be applied as the departure signal S.

  In this case, the forward solenoid valve operates at the timing when the instruction is input, and at the same time, the piston 82 advances from the backward end position P2.

  In FIG. 1, the starting signal S generated by the operation of the forward solenoid valve is input to the calculation unit 40. However, the forward solenoid valve as the starting signal generator is connected to the stroke end timer setting device 100. The structure provided as a part may be sufficient.

  Therefore, the elapsed time t1 is the time from when the departure signal S is input until the signal of the backward end sensor 30 switches from H to L.

  Similarly, the starting signal S ′ (timing corresponding to the start of movement of the moving body) when the piston 82 is retracted from the forward end position P1 is, for example, a configuration in which the piston 82 is retracted by a reverse solenoid valve (drive device). When it is adopted, an operation signal generated by the reverse solenoid valve at the timing when the reverse solenoid valve is operated can be applied.

  Therefore, in this case, the reverse solenoid valve corresponds to a departure signal generator that generates the departure signal S ′.

  It should be noted that in the case of operating the reverse solenoid valve by inputting an instruction (such as a start signal) for operating the reverse solenoid valve, the instruction such as the start signal can be applied as the departure signal S ′.

  In this case, the reverse solenoid valve operates at the timing when the instruction is input, and at the same time, the piston 82 moves backward from the forward end position P1.

  In FIG. 1, the departure signal S ′ generated by the operation of the reverse solenoid valve is input to the calculation unit 40, but the reverse solenoid valve as the departure signal generator is used as the stroke end timer setting device 100. The structure provided as a part of may be sufficient.

  Therefore, the elapsed time t4 is the time from when the departure signal S ′ is input until the signal of the forward end sensor 20 switches from H to L.

  Next, the operation of the stroke end timer setting device 100 of this embodiment will be described with reference to FIGS.

  In the initial state, the piston 82 is stopped in a state of being in contact with the backward end position P2. First, the time measurement by the timer 10 is started (S1), and then the forward movement command is received to advance the piston 82 at a constant speed v1. The forward solenoid valve is operated (S2), and the starting signal S, which is the operation signal, is input to the calculation unit 40, and the value T0 of the timer 10 at that time is recorded (S3).

  The calculation unit 40 waits for the piston 82 that has started to advance to pass the position P4 of the backward end sensor 30, and detects the passage of the piston 82 when the output of the backward end sensor 30 switches from H to L (S4). Then, the calculation unit 40 records the value T1 of the timer 10 when the output is switched (S5).

  The calculation unit 40 calculates an elapsed time t1 (= T1-T0) based on the recorded values T1 and T0 (S6), and the piston 82 passes through the position P3 of the forward end sensor 20. Waiting, when the output of the forward end sensor 20 is switched from L to H (S7), the passage of the piston 82 is detected, and the calculation unit 40 records the value T2 of the timer 10 when the output is switched (S8). ).

  The calculation unit 40 calculates an elapsed time t2 (= T2-T1) based on the recorded value T2 and value T1 (S9), and a sufficient time for the piston 82 to reach the forward end position P1. (S10).

  The time sufficient for the piston 82 to reach the forward end position P1 is stored in advance in the calculation unit 40 by default from the value T2 of the timer 10 when the piston 82 passes the position P3 of the forward end sensor 20. It is determined that the value of the timer 10 has reached T3 (= T2 + td3) (S10).

  When the value of the timer 10 reaches T3, the calculation unit 40 determines that the piston 82 has reached the forward end position P1, and stops the operation of the forward solenoid valve (S11).

  The piston 82 is stopped in a state where it is in contact with the forward end position P1, and then, in response to the reverse command, the reverse solenoid valve for moving the piston 82 back at a constant speed v2 is operated (S12). A certain departure signal S 'is input to the calculation unit 40, and the value T4 of the timer 10 at that time is recorded (S13).

  The calculation unit 40 waits for the piston 82 that has started to advance to pass the position P3 of the advance end sensor 20, and detects the passage of the piston 82 when the output of the advance end sensor 20 switches from H to L (S14). Then, the calculation unit 40 records the value T5 of the timer 10 when the output is switched (S15).

  The calculation unit 40 calculates an elapsed time t4 (= T5−T4) based on the recorded values T5 and T4 (S16) and determines that the piston 82 passes the position P4 of the backward end sensor 30. Waiting, when the output of the backward end sensor 30 is switched from L to H (S17), the passage of the piston 82 is detected, and the calculation unit 40 records the value T6 of the timer 10 when the output is switched (S18). ).

  The calculation unit 40 calculates an elapsed time t5 (= T6-T5) based on the recorded values T6 and T5 (S19) and sufficient time for the piston 82 to reach the reverse end position P2. (S20).

  The time sufficient for the piston 82 to reach the backward end position P2 is stored in advance in the calculation unit 40 by default from the value T6 of the timer 10 when the piston 82 passes the position P4 of the backward end sensor 30. It is determined that the value of the timer 10 has reached T7 (= T6 + td6) (S20).

  When the value of the timer 10 reaches T3, the calculation unit 40 determines that the piston 82 has reached the reverse end position P2, and stops the operation of the reverse solenoid valve (S21).

  And the calculating part 40 calculates 1st delay time t3 and 2nd delay time t6 according to said Formula (1), (2) using calculated elapsed time t1, t2, t4, t5. Then, the obtained first delay time t3 is stored in the storage unit of the forward end arrival determination unit 110, and the obtained second delay time t6 is stored in the storage unit of the backward end arrival determination unit 120 (S22). ), The process is terminated.

  Here, the significance of the above formulas (1) and (2) will be described.

  A value L2 / t2 obtained by dividing the distance L2 between the backward end sensor 30 and the forward end sensor 20 by the elapsed time t2 from the backward end sensor 30 to the forward end sensor 20 during forward movement is a forward speed of the piston 82. Since it is equal to v1, the following formula (3) is established.

  v1 = L2 / t2 (3)

  Since the value to be set as the first delay time t3 is the time required to move the distance L3 from the position P3 of the forward end sensor 20 to the forward end position P1 at the speed v1, the following equation (4) It is required.

  t3 = L3 / v1 (4)

  Here, the distance L3 is calculated by the following equation (5) using the elapsed time t4 when the piston 82 is retracted and the speed v2 when retracting.

  L3 = v2 × t4 (5)

  The reversing speed v2 of the piston 82 is calculated according to the following equation (6) based on the elapsed time t5 from the forward end sensor 20 to the backward end sensor 30 during the backward movement.

  v2 = L2 / t5 (6)

  Therefore, when the equations (3) to (6) are arranged, the first delay time t3 is calculated by the above equation (1).

  The following formulas (7) and (8) are also established for the backward delay time t6 and the distance L1 from the position P4 of the backward end sensor 30 to the backward end position P2.

  t6 = L1 / v2 (7)

  L1 = v1 × t1 (8)

  Therefore, when the equations (3) and (6) to (8) are arranged, the second delay time t6 is calculated by the above equation (2).

  As described above, according to the stroke end timer setting device 100 of the present embodiment, the forward end sensors respectively corresponding to the forward end position P1 and the backward end position P2 provided on the moving path for reciprocating the piston 82. 20. The delay times t3 and t6 from the detection by the backward end sensor 30 can be appropriately set as short as possible.

  When the stroke end timer setting device 100 according to the present embodiment calculates the distance L1 according to the equation (8), the forward speed of the piston 82 reaches from the backward end position P2 to the position P4 of the backward end sensor 30. The measured elapsed time t1 is used on the assumption that the speed is constant v1 until the piston 82 starts to move forward from the state of speed 0 stopped at the backward end position P2. Strictly speaking, it is not the constant speed v1, and the elapsed time t1 during that time is longer than the elapsed time in the case of the constant speed v1.

  Therefore, strictly speaking, the second delay time t6 obtained using the elapsed time t1 is not set in the shortest time. The same applies to the first delay time t3.

  However, such a difference in the length of time also absorbs the difference in the setting environment and anticipates the safety factor, so the environment and the safety factor were set as short and appropriate as possible. It can be said.

  Note that when the forward end sensor 20 and the backward end sensor 30 are limit switches, proximity switches, reed switches, etc., there is hysteresis, so the values of the delay times t3 and t6 may be corrected according to the hysteresis. Good.

  FIG. 1 shows that the timer 10 which is a constituent element of the stroke end timer setting device 100 determines whether or not the first delay time t3 has elapsed by the forward end arrival determination unit 110 outside the configuration of the stroke end timer setting device 100 and reaches the backward end. Although it is described that the time for determining whether the first delay time t3 has elapsed by the determination unit 120 is also measured, the forward end arrival determination unit 110 and the backward end arrival determination unit 120 are not limited to the stroke end timer setting device 100. Therefore, the progress may be measured by another timer prepared separately from the timer 10.

  On the other hand, the forward end arrival determination unit 110 and the backward end arrival determination unit 120 may also be included in the stroke end timer setting device 100 as a part of the configuration of the stroke end timer setting device 100.

  In the stroke end timer device 100 of the present embodiment, the moving body moves along a moving path between the forward end position P1 and the backward end position P2, which are the ends of the space, set as a position where the moving body hits and stops. The stroke end timer setting device according to the present invention is used to determine the delay time for the reciprocating movement. However, the position of both ends of the moving path along which the moving body reciprocates is limited to the end of the space. is not.

  That is, the end position (advance end position, retreat end position) in the present invention may be a position where the moving body stops by a stopper provided in front of the end of the space in which the moving body is accommodated. The position of the moving body stopped by the stopper corresponds to the end position on the moving path along which the moving body reciprocates.

  Further, for example, a chuck device in a machine tool grips and holds a workpiece from the outer periphery, and an opening / closing operation of the gripping chuck member is performed by a hydraulic cylinder, an air cylinder, or the like connected to the chuck member.

  Although the piston reciprocates inside the cylinder, the piston does not necessarily reciprocate between the ends of the internal space of the cylinder, and may stop before the end of the cylinder, for example.

  That is, since the chuck member stops at the position where the workpiece is held, in this case, the stop position of the piston when the chuck member stops corresponds to the above-described end positions (advance end position, retreat end position).

  Further, the stroke end timer device 100 of the present embodiment performs the processes S1 to S22 shown in FIGS. 4 and 5 only once to obtain the first delay time t3 and the second delay time t6. The stroke end timer setting device according to the present invention repeatedly performs the processes S1 to S22 a plurality of times, and finally outputs based on the plurality of first delay times t3 and the plurality of second delay times t6 obtained. The first delay time t3 and the second delay time t6 may be calculated.

  That is, for example, as shown in FIG. 6, the processes S1 to S22 are repeated three times. Each of the second delay times t6 is stored, and the longest delay time t3 among the three obtained first delay times t3 is output as the first delay time t3 in the forward path (S27). The longest delay time t6 of the second delay times t6 may be output (S27) as the second delay time t6 in the return path.

  Thus, the accuracy of the first delay time t3 and the plurality of second delay times t6 can be improved by repeating the processing a plurality of times.

  As described above, the calculation unit 40 determines the first delay time t3 to be finally output based on the plurality of first delay times t3 obtained by repeating the processes S1 to S22 a plurality of times. The processing and the processing by the calculation unit 40 that determines the second delay time t6 to be finally output based on the obtained plurality of second delay times t3 are limited to those that select the maximum value described above. Is not to be done.

  That is, the arithmetic unit 40 calculates an average value and a median value (reference value of the delay time in the forward path) in addition to the obtained maximum value of the first delay times t3, and calculates the calculated first value. A value obtained by multiplying the maximum value, average value, and median value of the delay time t3 by a predetermined safety factor is set and output as the final first delay time t3, and a plurality of second times obtained are obtained. In addition to the maximum value of the delay time t6, an average value and a median value (reference value of the delay time in the return path) are calculated, and the calculated maximum value, average value, and median value of the second delay time t6 are calculated. A value obtained by multiplying a predetermined safety factor may be set and output as the final second delay time t6.

  The reference value is set as the final first delay time t3 and output without multiplying the maximum value, average value, or median value of the first delay time t3, which is the reference value, by the safety factor. May be.

  Similarly, the reference value is set as the final second delay time t6 and output without multiplying the safety factor by the maximum value, average value, or median value of the second delay time t6, which is the reference value. May be.

  In addition, when repeating process S1-S22 several times, the calculating part 40 resets each timer value T0-T7 to zero each time it repeats (S24).

  Processes S23, S25, and S26 in FIG. 6 are for defining the number of times to repeat processes S1 to S22.

(Embodiment 2)
The stroke end timer setting device 200 of the embodiment shown in FIG. 7 includes a mode selection switch 50 and a control device 60 added to the stroke end timer setting device 100 of the first embodiment, and is a machine tool that is automatically controlled such as an automatic lathe. Is applied. The control device 60 can automatically control a machine tool such as an automatic lathe based on a machining program.

  The rest of the configuration excluding the mode selection switch 50 and the control device 60 is the same as that in the stroke end timer setting device 100 of the first embodiment, and detailed description thereof is omitted.

  For example, as shown in FIG. 8, the mode selection switch 50 can selectively select one of an automatic setting mode switch, a learning mode switch, and an off switch provided in a part of the operation panel 70. It is composed of push buttons.

  The automatic setting mode that can be selected by the mode selection switch 50 controls the drive of the forward solenoid valve and the reverse solenoid valve by the controller 60 in order to set the first delay time t3 and the second delay time t6. This is an operation mode for calculating the first delay time t3 and the second delay time t6.

  On the other hand, the learning mode that can be selected by the mode selection switch 50 is during an actual machining operation by automatic control of the control device 60 based on a machining program in which the moving body moves by driving the forward solenoid valve and the backward solenoid valve. The operation unit 40 calculates the first delay time t3 and the second delay time t6 by measuring the timer values T0 to T7 in the machining operation.

  When the automatic setting mode is selected by the mode selection switch 50, the stroke end timer setting device 200 sets the forward solenoid valve ON in step 2 (S2) in the processing of the flowcharts shown in FIGS. The control device 60 issues a command and a command for turning on the reverse solenoid valve in step 12 (S12).

  In the first embodiment, the forward solenoid valve and the reverse solenoid valve are operated by a command from the outside that is not the stroke end timer device 100.

  Other processes are the same as those of the stroke end timer setting device 100 of the first embodiment.

  Also in this stroke end timer setting device 200, as shown in FIG. 6, the first delay time t3 and the second delay time t6 may be obtained by repeating steps S1 to S22 a plurality of times.

  Further, a device (a moving body is reciprocated by a driving device (for example, a forward solenoid valve and a reverse solenoid valve) along a movement path) that is a measurement target of the first delay time t3 and the second delay time t6. ) Are provided on the operation panel 70 in addition to the mode selection switch 50, a target selection switch for selecting one of the plurality of measurement target devices, and the measurement target device selected by the target selection switch For example, the control device 60 may control the driving thereof, and the calculation unit 40 may obtain the first delay time t3 and the second delay time t6 for the measurement target device.

  When the selection by the target selection switch is switched to another measurement target device, the control device 60 similarly controls the drive of the switched measurement target device, and the calculation unit 40 controls the measurement target device. A first delay time t3 and a second delay time t6 are determined for the device.

  Thus, according to the stroke end timer setting device 200 of the present embodiment, since the measurement target device is driven in conjunction with the stroke end timer setting device in the automatic setting mode, the measurement target device and the stroke end timer setting are set. There is no need to operate the device separately.

  Therefore, the operation becomes simple and can be handled even if the operator is not a person skilled in the operation.

  On the other hand, when the learning mode is selected by the mode selection switch 50, the stroke end timer setting device 200 performs substantially the same process as the process 1 in the flowcharts shown in FIGS.

  However, in the first embodiment, the measurement target device is operated by the control device 60 so as to automatically reciprocate the moving body, and the first delay time t3 and the second delay time t6 are determined by the stroke end timer setting device 100. In the second embodiment, the measurement target apparatus is operated in the automatic operation mode based on the machining program, and the appropriate first to be set in the measurement target apparatus. The difference is that the delay time t3 and the second delay time t6 are obtained by the stroke end timer setting device 200.

  That is, in the learning mode according to the second embodiment, in the operation of supplying the workpiece to the spindle and performing the cutting process on the workpiece by the automatic operation operation according to the machining program, for example, the chuck at the time of supplying the workpiece While performing the actual operation of the cylinder stroke devices such as the opening / closing operation of the member and the separation operation by the cylinder operation when the workpiece is cut off, which is the final process of machining, the calculation unit 40 performs timer values T0 to T7 in the actual operation state. The delay times t3 and t6 can be calculated by performing an operation while recording.

  Therefore, the stroke end timer installation device 200 according to the second embodiment can obtain appropriate delay times t3 and t6 in the learning mode without stopping the actual operation of the measurement target device.

  The delay times t3 and t6 obtained in this way are used during the next actual operation of the measurement target device.

  As described above, according to the stroke end timer setting device 200 of the present embodiment, in the learning mode, the delay times t3 and t6 can be obtained in the actual operation state of the measurement target device. Therefore, it is not necessary to suspend the actual operation of the measurement target device.

  Therefore, it is possible to prevent the operation time of the measurement target apparatus from being shortened.

  When it is necessary to measure the delay times t3 and t6 by the stroke end timer setting device, the following cases (1) to (4) can be considered.

(1) When the end position changes (i) For example, when the workpiece is gripped by the chuck device of the machine tool, the end position of the chuck device changes according to the diameter of the workpiece.
(Ii) For example, when the workpiece diameter is changed by changing the setup, adjustment of the stroke end sensor (detection means) with respect to the end position and adjustment of the stroke end timer are required.

(2) When replacing with a new sensor (i) For example, when the stroke end sensor is removed and replaced, an error may occur in the mounting position of the stroke end sensor before and after replacement.
(Ii) Even if the error in the mounting position of the stroke end sensor can be reduced, adjustment with the stroke end timer is necessary.

(3) When the speed of the moving body changes (i) In a machine tool such as a lathe, the chuck device that holds the workpiece has a difference in the speed of the moving body such as the piston in the cylinder according to the type of the chuck device. There is a need to individually adjust the delay times t3 and t6.
(Ii) When the chuck device is replaced by changing the setup, it is necessary to adjust the stroke end timer because the speed of the moving body has changed.

(4) Case of change in hydraulic temperature Generally, when the device to be measured is a hydraulic cylinder device, the speed of the moving body in the cylinder varies depending on the oil temperature.
In particular, when the temperature is low, such as in winter, the operation starts with the oil temperature being low, and the oil temperature rises as the operation time elapses, so the speed of the moving body changes according to the elapsed time. To do.
In addition, even when the operation is resumed after the target device is temporarily stopped at a lunch break or the like, the speed of the moving body changes according to the elapsed time.
Therefore, it is necessary to adjust the delay times t3 and t6 during the day.
In addition, when the delay temperatures t3 and t6 are set in the normal temperature environment and the actual operation is performed in the low temperature environment, the delay time in the actual operation becomes longer than the set delay times t3 and t6. Although the times t3 and t6 cannot be set, this problem can be solved by setting the delay times t3 and t6 in a low temperature environment.

10 timer (first time measuring means, second time measuring means)
20 Advance end sensor (detection means)
30 Back end sensor (detection means)
40 Calculation unit (calculation means)
100 Stroke End Timer Setting Device 110 Advance End Arrival Determination Unit 120 Backward End Arrival Determination Units L1, L2, L3 Distance P1 Advance End Position P2 Backward End Position P3 Advance End Sensor Position P4 Backward End Sensor Positions S, S ′ Departure Signal t1, t2, t4, t5 Elapsed time t3 First delay time t6 Second delay time v1, v2 Speed

Claims (10)

Two detection means provided to detect the passage of the moving body in front of each end position corresponding to each of the both end positions of the moving path in which the moving body reciprocates;
A first time measurement for measuring an elapsed time from when the moving body starts to move until it is detected by the detecting means when the moving body moves from one end position toward the other end position Means,
A second time measuring means for measuring a time from when the moving body is detected by one of the detecting means until it is detected by the other detecting means;
When the moving body reciprocates between both end positions of the moving path, the time measured by the first time measuring means and the second time measuring means in the forward path, and the first time in the return path, respectively. Based on the time measured by the time measuring means and the second time measuring means, respectively, after the moving body passes the detection means corresponding to the end position on the downstream side in the movement direction in the forward path and the return path, the A stroke end timer setting device comprising: a calculating means for calculating a delay time until reaching an end position on the downstream side in the moving direction.   The calculation means calculates a ratio of each time measured by the second time measurement means in the forward path and the return path to each time measured by the first time measurement means in the forward path and the return path. The stroke end timer setting device according to claim 1, wherein the delay time is calculated by multiplication. The stroke end timer setting device according to claim 1, further comprising a departure signal generation device that generates a departure signal corresponding to a timing corresponding to a start of movement of the moving body.   The stroke end timer according to any one of claims 1 to 3, wherein the moving body moves between the two end positions at a substantially constant speed along the movement path. Setting device. The time obtained by the first time measuring means in the forward path is t1, the time obtained by the second time measuring means in the forward path is t2, and the time obtained by the first time measuring means is obtained in the backward path by the first time measuring means. When the time is t4 and the time obtained by the second time measuring means in the return path is t5,
5. The calculation means according to claim 1, wherein the calculation means calculates a delay time t <b> 3 in the forward path and a delay time t <b> 6 in the return path according to the equations (1) and (2). The stroke end timer setting device according to the item.
t3 = t2 × t4 / t5 (1)
t6 = t1 × t5 / t2 (2) The computing means is
The operation of calculating the delay time by reciprocating the moving body between the one end position and the other end position along the movement path is obtained a plurality of times. Based on the plurality of delay times in the forward path, set the delay time in the forward path,
The stroke according to any one of claims 1 to 5, wherein a delay time in the return path is set based on a plurality of the delay times in the return path obtained by the repetition. End timer setting device. The computing means is
Based on the plurality of delay times in the forward path obtained by the repetition, the maximum value, average value, or median value is also calculated as a reference value for the delay time in the forward path, and a reference value for the delay time in the forward path On the basis of the delay time in the forward path,
Based on the plurality of delay times in the return path obtained by the repetition, the maximum value, average value, or median value is also calculated as a reference value of the delay time in the return path, and a reference value of the delay time in the return path The stroke end timer setting device according to claim 6, wherein a delay time in the return path is set based on A mode selection switch for inputting an operation mode;
A control device that controls driving of a driving device that reciprocates the moving body along the moving path, and
The control device controls the drive device according to an operation mode input to the mode selection switch, and the calculation means calculates and sets the delay time. The stroke end timer setting device according to claim 1. The mode selection switch is provided so that an automatic setting mode can be selected as an input operation mode,
When the automatic setting mode is selected and inputted to the mode selection switch, the control device controls the driving of the driving device so as to automatically reciprocate the moving body, thereby calculating the computing means. 9. The stroke end timer setting device according to claim 8, wherein the delay time is calculated. The mode selection switch is provided so that a learning mode can be selected as an input operation mode,
When the learning mode is selected and input to the mode selection switch, the control device automatically controls the machine tool based on a machining program, and the calculation means is configured such that the drive device is operated automatically by the machining program. The stroke end timer setting device according to claim 8 or 9, wherein the delay time is calculated based on the time measured during a period in which the moving body is moved.