EP3597806B1 - Procédé d'arrêt d'un métier à tisser et métier à tisser pour la mise en oeuvre du procédé d'arrêt - Google Patents
Procédé d'arrêt d'un métier à tisser et métier à tisser pour la mise en oeuvre du procédé d'arrêt Download PDFInfo
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- EP3597806B1 EP3597806B1 EP19182463.0A EP19182463A EP3597806B1 EP 3597806 B1 EP3597806 B1 EP 3597806B1 EP 19182463 A EP19182463 A EP 19182463A EP 3597806 B1 EP3597806 B1 EP 3597806B1
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- rotation rate
- command
- main shaft
- rotation
- braking
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- 238000000034 method Methods 0.000 title claims description 19
- 230000008859 change Effects 0.000 claims description 62
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 description 77
- 238000009941 weaving Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
- D03D51/10—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping suddenly
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
Definitions
- the present invention relates to a loom including a control device that controls the rotation of a main shaft on the basis of a predetermined command rotation rate and an electromagnetic brake that brakes the main shaft, the control device being configured to control the rotation of the main shaft on the basis of a preset steady rotation rate in steady operation.
- the driving of a driving motor is controlled such that a main shaft is rotationally driven at a preset steady rotation rate, and the operation is performed.
- the loom includes a control device, and the control device controls the driving of the driving motor on the basis of a predetermined command rotation rate.
- the control device includes, for example, an inverter.
- the output frequency of the inverter is set to a frequency corresponding to the command rotation rate and hence the driving motor is controlled at a rotation rate corresponding to the command rotation rate.
- the steady rotation rate serves as the command rotation rate and the driving of the driving motor is controlled (the main shaft is rotationally driven).
- the loom typically includes an electromagnetic brake for stopping the rotation of the main shaft as disclosed in, for example, Japanese Unexamined Patent Application Publication No. 6-158478 .
- a stop command is generated when the operation is required to be stopped
- the electromagnetic brake is actuated in response to the generation of the stop command
- a braking force acts on the main shaft
- the rotation of the main shaft is stopped.
- a braking operation (control on the electromagnetic brake etc.) is performed such that the rotation of the main shaft is stopped at a time point at which the main shaft has been rotated by about one rotation (or two rotations) by inertia since the time point at which the stop command has been generated.
- the braking operation is performed such that the rotation of the main shaft is stopped in a short stop period in which the main shaft is rotated by only about one rotation (or two rotations) by inertia (a braking period with the electromagnetic brake).
- an excessive load may be applied to a mechanical component (the main shaft, a part that is moved by the main shaft as a drive source, its drive transmission part, etc.) that is driven by the driving motor, or the electromagnetic brake in accordance with a weaving condition or the like.
- the mechanical component that moves (rotates) in accordance with the high rotation rate is to be stopped by the above-described motion in the short stop period.
- the braking operation is performed in a state in which a large load is applied to the mechanical component due to the inertia corresponding to the speed.
- a braking force so large that stops the main shaft rotating at such a high rotation rate (high rotation speed) within the above-described short stop period acts on the main shaft.
- the load to be applied to the electromagnetic brake in the braking operation becomes markedly large.
- the steady rotation rate is not set high as described above, for example, when the number of heald frames included in the mechanical component is large, the inertia of the mechanical component that is driven by the driving motor increases as the weight of the mechanical component increases. Hence, the braking operation is performed in a state in which a large load is applied to the mechanical component like the above-described situation.
- the mechanical component may be broken or a braking member such as a brake shoe of the electromagnetic brake may wear early. If the wear of the braking member of the electromagnetic brake progresses, the braking force decreases, and hence the braking member is required to be replaced.
- a long stop period may be set instead of a short stop period such as one described above, and the rotation speed of the main shaft may be reduced in such a long stop period (at a more gentle speed-reduction gradient) to stop the rotation.
- the braking with the electromagnetic brake is performed for the long period every braking operation, and due to this, the braking member of the electromagnetic brake may wear early like the above-described situation.
- a braking operation may be performed by using a combination of regenerative braking and braking with the electromagnetic brake.
- the rotation speed of the main shaft is reduced first by the regenerative braking, and then the rotation of the main shaft is stopped by actuation of the electromagnetic brake.
- the inverter of the control device may be burn-damaged.
- the braking operation is performed such that the entirety of the stop period from the generation of the stop command until the rotation of the main shaft is stopped is a short period. Therefore, the braking operation is set such that the braking period with the electromagnetic brake is a short period and the braking period by the regenerative braking is a short period.
- the braking operation is set such that the regenerative braking of dropping the rotation rate of the main shaft to the rotation rate at which the electromagnetic brake is actuated is performed in a short period.
- the regenerative braking is performed to continuously reduce the rotation speed of the main shaft (at a steep speed-reduction gradient) in the short period.
- regenerative electric power is generated from the driving motor toward the inverter by the regenerative braking.
- a capacitor or a resistor (hereinafter, also referred to as “resistor or the like”) is typically provided in a circuit that is connected to the inverter.
- the generated regenerative electric power is absorbed in a manner stored in the capacitor or in a manner converted into thermal energy by the resistor and released to the outside, to prevent the excessive regenerative electric power from flowing to the inverter.
- the regenerative electric power to be generated is markedly large.
- the regenerative electric power may not be completely absorbed by the resistor or the like.
- a problem due to the regenerative braking may occur such that the excessive regenerative electric power flows to the inverter and the inverter is burn-damaged.
- a resistor or the like having a large capacity may be employed. In this case, however, the apparatus cost may increase.
- an object of the present invention is to provide a method for stopping a loom, based on that a braking operation is performed by using a combination of regenerative braking and braking with an electromagnetic brake as described above, the method reducing a load that is applied to a mechanical element or the like such as one described above and not causing a problem due to the regenerative braking such as one described above; and also to provide a loom that can realize the stopping method.
- a method for stopping a loom and a loom for realizing the stopping method presuppose a loom including a control device that controls rotation of a main shaft on the basis of a predetermined command rotation rate, and an electromagnetic brake that brakes the main shaft, the control device being configured to control the rotation of the main shaft on the basis of a preset steady rotation rate in steady operation.
- the method for stopping the loom according to the present invention as defined in claim 1 includes a first braking step that is started at a time point at which a stop command has been generated or later, the first braking step dropping a rotation rate of the main shaft toward a predetermined stop rotation rate that is lower than the steady rotation rate by changing the command rotation rate two times or more; and a second braking step of actuating the electromagnetic brake at a time point at which the rotation rate has reached the stop rotation rate or later and braking the main shaft, the second braking step stopping the rotation of the main shaft.
- the command rotation rate is changed in the first braking step every period of one rotation or more of the main shaft.
- a loom according to the present invention as defined in claim 3 includes an angle detector that detects a rotation angle of the main shaft and a storage unit that stores rotation rate information that is information relating to the command rotation rate and that is obtained using a predetermined stop rotation rate and a predetermined number of times of change of the command rotation rate, the number of times of change being two or more, and period information that is information for determining a period in which the command rotation rate is changed and that the period is set to a period of one rotation or more of the main shaft.
- control device of the loom includes a drive command unit that receives an input of angle information that is obtained on the basis of a detection signal from the angle detector, that obtains, for a first change time point of the command rotation rate based on generation of a stop command and a second or later change time point of the command rotation rate obtained on the basis of the angle information and the period information with reference to the first change time point, the command rotation rate corresponding to each of the change time points from the rotation rate information, and that outputs a drive command based on each of the obtained command rotation rates at corresponding one of the change time points; and a drive unit that drives the driving motor on the basis of the drive command from the drive command unit.
- the "stop rotation rate” is determined as a rotation rate lower than the steady rotation rate, and is determined as a rotation rate such that a load that is applied to a mechanical element or the like such as one described above due to the braking with the electromagnetic brake is within a permissible load range even when the braking period with the electromagnetic brake is a short period like one described above.
- the "permissible load” described here is substantially a load that does not cause the above-described problem caused by the excessive load that is applied to the mechanical element or the like due to the braking with the electromagnetic brake when the braking period with the electromagnetic brake is a short period such as one described above.
- the first braking step may be performed on the basis of a preset rotation rate drop amount and the period. Furthermore, in the loom, the rotation rate information may include a preset rotation rate drop amount.
- the braking operation from the time point at which the stop command has been generated until the rotation of the main shaft is stopped is performed in the first braking step of the braking (that is, the regenerative braking) of changing the command rotation rate and hence changing the rotation rate of the main shaft (reducing the rotation speed of the main shaft), and the second braking step of the braking with the electromagnetic brake.
- the speed reduction in the first braking step (the regenerative braking) is performed to lower the rotation rate of the main shaft to the stop rotation rate.
- the stop rotation rate is determined as a rotation rate lower than the steady rotation rate, and is determined as a rotation rate such that a load that is applied at the braking with an electromagnetic brake is within the above-described permissible load range even when the braking period with the electromagnetic brake is a short period like one described above. Accordingly, with such a braking operation, a problem in which the mechanical component is broken or a problem in which the braking member of the electromagnetic brake wears early due to the load that is applied at the braking with the electromagnetic brake does not occur.
- the braking in the first braking step is performed by changing the command rotation rate two times or more. That is, in the first braking step, the operation of dropping the rotation rate of the main shaft from the steady rotation rate toward the stop rotation rate is performed by the regenerative braking that is performed a plurality of times in a divided manner. Accordingly, the drop amount of the rotation rate by the single regenerative braking is a small amount, and the regenerative electric power generated by the single regenerative braking is also small.
- the change of the command rotation rate that is performed two times or more is performed every period of one rotation or more. That is, the plurality of times of the regenerative braking in the first braking step each are performed every period of one rotation or more of the main shaft from the start of the previous braking to the start of the next braking. Accordingly, the small regenerative electric power generated by each regenerative braking is completely absorbed by the resistor or the like in the period. Consequently, for example, even when the rotation rate in steady operation is high as described above, a situation in which the resistor or the like cannot completely absorb the regenerative electric power generated by the regenerative braking does not occur. Thus, a problem caused by the regenerative braking as described above does not occur.
- a loom includes a main shaft 10, a driving motor 20 that rotationally drives the main shaft 10, and a drive control device 30 that controls the driving of the driving motor 20.
- the loom also includes a warp shedding device (not illustrated) that forms/closes a warp shed, and a reed (not illustrated).
- the warp shedding device and so forth are coupled to the main shaft 10 via a drive transmission mechanism (not illustrated).
- the warp shedding device and so forth are driven during weaving in a predetermined mode while the main shaft 10 serves as a drive source.
- the loom includes an input setting unit 40 for inputting and setting set values, such as a steady rotation rate that is the rotation rate of the main shaft 10 in steady operation and a shedding pattern indicative of a shedding order of a heald frame in the warp shedding device.
- the input setting unit 40 is connected to the drive control device 30.
- the drive control device 30 includes a main control unit 32 that is connected to the input setting unit 40, and a drive command unit 34 that is connected to the main control unit 32.
- the drive command unit 34 includes a storage unit 34a that stores the set values such as the steady rotation rate. The set values such as the steady rotation rate are input to and set in the input setting unit 40, and are transmitted to and stored in the drive command unit 34 from the input setting unit 40 via the main control unit 32.
- the drive control device 30 also includes an inverter 36 that controls the driving of the driving motor 20.
- the inverter 36 is connected to the drive command unit 34.
- the drive control device 30 outputs a frequency command signal (a drive command) corresponding to a target rotation rate of the main shaft 10 from the drive command unit 34 to the inverter 36, controls the inverter 36 on the basis of the frequency command signal, and hence controls the driving of the driving motor 20.
- the drive command unit 34 outputs the frequency command signal corresponding to the steady rotation rate stored in the storage unit 34a to the inverter 36 in the drive control device 30.
- the inverter 36 generates an output frequency corresponding to the frequency command signal, and controls the driving of the driving motor 20 such that the driving motor 20 is driven at the rotation rate corresponding to the steady rotation rate. That is, the driving motor 20 is controlled to be driven at the rotation rate corresponding to the output frequency of the inverter 36.
- the loom also includes an angle detector 50 that detects the rotation angle of the main shaft 10.
- the angle detector 50 detects the rotation angle in units of one rotation of the main shaft 10.
- the angle detector 50 is connected to the main control unit 32 of the drive control device 30.
- the angle detector 50 outputs a detection signal based on the detected rotation angle of the main shaft 10 to the main control unit 32.
- the main control unit 32 obtains angle information on the main shaft 10 on the basis of the input detection signal, and outputs an angle signal based on the angle information to the drive command unit 34.
- the loom also includes an electromagnetic brake 60 for stopping the rotation of the main shaft 10 by causing a braking force to act on the main shaft 10.
- the electromagnetic brake 60 is connected to the drive command unit 34. With the connection, the electromagnetic brake 60 receives the input of a braking command signal that is output from the drive command unit 34, and causes a braking force to act on the main shaft 10.
- the drive control device 30 provides control to perform a braking operation from a time point at which a stop command has been generated until the rotation of the main shaft 10 is stopped by using braking (regenerative braking) that changes a command rotation rate serving as the basis of the frequency command signal from the drive command unit 34 and hence changes the rotation rate (a main shaft rotation rate) (reduces the speed) of the main shaft 10, and braking (electromagnetic braking) with the electromagnetic brake 60.
- the regenerative braking is performed by reducing the rotation rate of the main shaft 10 that rotates at the steady rotation rate to a stop rotation rate that is determined as a rotation rate lower than the steady rotation rate.
- the drive control device 30 controls the dropping of the main shaft rotation rate toward the stop rotation rate by the regenerative braking that is performed a plurality of times in a divided manner. Further, the plurality of times of the regenerative braking each are performed every period of one rotation or more of the main shaft 10 from the start of previous braking to the start of next braking.
- a specific configuration of the drive control device 30 is as follows.
- the stop rotation rate is a rotation rate that is determined with regard to a load that is applied to a warp shedding device and so forth coupled to the main shaft 10 or a mechanical element or the like such as a drive transmission mechanism.
- the stop rotation rate is a rotation rate that is lower than the steady rotation rate.
- the steady rotation rate is set to a markedly high rotation rate as compared with the rotation rate of a typical loom, when electromagnetic braking is applied on the main shaft 10 that is rotated at the steady rotation rate, the load that is applied to the mechanical element or the like becomes excessive and the above-described problem may occur.
- the rotation rate that does not cause the above-described problem and that is permissible (a permissible rotation rate) is obtained, and then the stop rotation rate is determined as a rotation rate equal to or lower than the permissible rotation rate.
- the steady rotation rate is set to 1800 rpm as a markedly high rotation rate as described above.
- the example is described below.
- the load that is applied to the mechanical element or the like during electromagnetic braking varies depending on the specifications and weaving conditions of the loom.
- the permissible rotation rate that is obtained on the basis of the load is 1000 rpm.
- the stop rotation rate is determined as a rotation rate equal to or lower than the permissible rotation rate as described above, and the permissible rotation rate is determined at 1000 rpm that is the upper limit of the permissible rotation rate.
- the set value of the stop rotation rate is input to and set in the input setting unit 40 and stored in the storage unit 34a of the drive command unit 34 similarly to the set value of the steady rotation rate and so forth.
- the drop of the main shaft rotation rate by the regenerative braking from the steady rotation rate toward the stop rotation rate is caused by regenerative braking that is performed a plurality of times in a divided manner as described above.
- the frequency command signal serving as the drive command that is output from the drive command unit 34 is changed a plurality of times to perform the regenerative braking a plurality of times. That is, the command rotation rate serving as the basis of the frequency command signal is changed a plurality of times.
- a change of the command rotation rate represents a change of the frequency command signal that is output from the drive command unit 34.
- a drop amount of the command rotation rate (a rotation rate drop amount) in every change is determined such that the regenerative electric power generated by the regenerative braking due to the change does not exceed the permissible amount of the regenerative electric power that can be absorbed by the resistor or the like.
- the rotation rate drop amount is uniformly determined as 200 rpm. In other words, in this embodiment, when the main shaft rotation rate is dropped from 1800 rpm that is the steady rotation rate to 1000 rpm that is the stop rotation rate, the command rotation rate is changed four times by dropping the command rotation rate by 200 rpm each.
- the rotation rate drop amount determined as 200 rpm as described above is stored as a set value in the drive control device 30.
- the drive command unit 34 of the drive control device 30 calculates the command rotation rate every change by subtracting the rotation rate drop amount (200 rpm) from the command rotation rate serving as the basis of the previously output frequency command signal. That is, the drive command unit 34 of this embodiment has a function for calculating the command rotation rate every change (a calculation function) in this way.
- the set value of the rotation rate drop amount (200 rpm) is input to and set in the input setting unit 40 and stored in the storage unit 34a of the drive command unit 34 similarly to the set values of the steady rotation rate and so forth.
- the rotation rate drop amount stored in the storage unit 34a of the drive command unit 34 in this way corresponds to rotation rate information according to the present invention.
- each regenerative braking is performed every period of one rotation or more of the main shaft 10 from the start of previous braking to the start of next braking. That is, the change of the command rotation rate (the output of the changed frequency command signal) that is performed a plurality of times is performed such that the change (output) is performed every period of one rotation or more of the main shaft 10.
- the resistor or the like has to be in a state in which the resistor or the like can absorb the regenerative electric power generated in this way, at each change time point of the command rotation rate (an output time point of the frequency command signal). Therefore, in this period, the resistor or the like needs to be determined as being in the aforementioned state at each change time point of the command rotation rate.
- the period (a set period) is uniformly determined as a period corresponding to two rotations of the main shaft 10.
- the command rotation rate is changed every two rotations of the main shaft 10 since the previous change time point of the command rotation rate (dropped by 200 rpm each).
- the set value of the set period is input to and set in the input setting unit 40 and stored in the storage unit 34a of the drive command unit 34 similarly to the above.
- the storage unit 34a of the drive command unit 34 stores an information reading program (hereinafter, merely referred to as "program") for reading the set period determined as described above at each change time point of the command rotation rate (each output time point of the frequency command signal) and stored in the storage unit 34a. Based on this, the drive command unit 34 performs the next change of the command rotation rate on the basis of the set period read by using the program.
- the set value of the set period and the program stored in the storage unit 34a of the drive command unit 34 in this way correspond to period information according to the present invention.
- the set period is a period uniformly corresponding to two rotations of the main shaft 10 as described above.
- the program is set to read the common set period at each change time point of the command rotation rate. At each change time point, the common set period is read from the storage unit 34a in the drive command unit 34 using the program.
- a stop operation of stopping the loom (the main shaft 10) from the steady operation state in which the main shaft 10 is rotated at the steady rotation rate is performed, for example, by an operator operating a stop button of the input setting unit 40.
- a stop signal is output from the input setting unit 40 to the main control unit 32.
- the stop operation is also performed when weaving abnormality (for example, a weaving defect, such as warp yarn breakage or defective weft insertion) during weaving occurs.
- an abnormality signal is output to the main control unit 32 from a detecting device (not illustrated) that detects the weaving abnormality.
- the main control unit 32 When the stop signal or the abnormality signal is input to the main control unit 32, the main control unit 32 generates a stop command and outputs the stop command to the drive command unit 34.
- the timing at which the stop command is generated is determined as a predetermined timing in one cycle of the loom (one rotation of the main shaft 10).
- the drive command unit 34 calculates a command rotation rate corresponding to a first change time point of the command rotation rate (a first calculation rotation rate) by the calculation function on the basis of the steady rotation rate and the rotation rate drop amount that is the rotation rate information stored in the storage unit 34a. To be specific, the drive command unit 34 calculates the first calculation rotation rate (1600 rpm) by subtracting the rotation rate drop amount (200 rpm) from the steady rotation rate (1800 rpm).
- the drive command unit 34 changes the command rotation rate from the steady rotation rate to the first calculation rotation rate at a predetermined start timing of the regenerative braking after the timing at which the stop command is generated (for example, at a time point at which the rotation angle of the main shaft 10 has reached 360° (0°) the first time since the input of the stop command), and outputs a frequency command signal serving as a drive command based on the first calculation rotation rate to the inverter 36. Consequently, the inverter 36 controls the driving of the driving motor 20 in accordance with an output frequency based on the frequency command signal, and hence the main shaft rotation rate is dropped from 1800 rpm that is the steady rotation rate to 1600 rpm.
- the predetermined start timing of the regenerative braking corresponds to a first change time point of a command rotation rate according to the present invention.
- the drive command unit 34 determines a second change time point of the command rotation rate on the basis of the set period (the period information) read using the program, at the first change time point of the command rotation rate. To be specific, the drive command unit 34 determines the second change time point of the command rotation rate at a time point at which a period corresponding to two rotations of the main shaft 10 has elapsed since the first change time point of the command rotation rate. Then, the drive command unit 34 monitors the rotation angle of the main shaft 10 from the rotation angle at the first change time point of the command rotation rate on the basis of the angle signal (angle information) output from the main control unit 32.
- the drive command unit 34 calculates a command rotation rate corresponding to the second change time point of the command rotation rate (a second calculation rotation rate), at a predetermined calculation timing of the command rotation rate, between the first change time point of the command rotation rate and the second change time point of the command rotation rate.
- the calculation timing is determined as a time point at which the rotation angle of the main shaft 10 has reached 100° the second time since the first change time point of the command rotation rate.
- the drive command unit 34 reads the rotation rate drop amount stored in the storage unit 34a again.
- the drive command unit 34 calculates the second calculation rotation rate (1400 rpm) by subtracting the read rotation rate drop amount (200 rpm) from the first calculation rotation rate (1600 rpm).
- the drive command unit 34 changes the command rotation rate from the first calculation rotation rate to the second calculation rotation rate, and outputs a frequency command signal based on the second calculation rotation rate to the inverter 36. Accordingly, the main shaft rotation rate is dropped from 1600 rpm to 1400 rpm.
- the drive command unit 34 repeats similar control, calculates command rotation rates (calculation rotation rates) corresponding to third and fourth change time points of the command rotation rate, and changes the command rotation rate at each of the change time points. Accordingly, the main shaft rotation rate is dropped by 200 rpm each from 1400 rpm to 1000 rpm that is the stop rotation rate.
- a braking step by the regenerative braking that drops the main shaft rotation rate from the steady rotation rate toward the stop rotation rate by changing the command rotation rate a plurality of times as described above corresponds to a first braking step according to the present invention.
- the drive command unit 34 calculates a command rotation rate (a calculation rotation rate) corresponding to the next change time point of the command rotation rate, at a calculation timing between a change time point of the command rotation rate and the next change time point of the command rotation rate as described above. Then, at each calculation time point, the drive command unit 34 has a function of comparing the calculated calculation rotation rate with the stop rotation rate stored in the storage unit 34a, and determining whether both values meet each other or not. When the drive command unit 34 determines that the calculation rotation rate meets the stop rotation rate as the result of the comparison, the drive command unit 34 invalidates the calculation function at the calculation time point of the calculation rotation rate or later, and sets an actuation flag of the electromagnetic braking with the electromagnetic brake 60, in the drive command unit 34.
- a command rotation rate a calculation rotation rate
- the calculation function of the drive command unit 34 at the calculation time point or later is invalidated.
- the calculation rotation rate is not calculated because the calculation function is invalidated.
- the drive command unit 34 actuates the electromagnetic brake 60 to apply the electromagnetic braking on the main shaft 10. That is, a second braking step by the electromagnetic brake 60 is started. Accordingly, the main shaft rotation rate is dropped from the stop rotation rate, and the rotation of the main shaft 10 is stopped in the second braking step. Thereafter, the invalidated state of the calculation function of the drive command unit 34 is reset at the next start time point of the loom.
- the actual change of the main shaft rotation rate has a shape indicated by a broken line in Fig. 2 .
- a solid line in Fig. 2 indicates a process of the change of the command rotation rate that is performed a plurality of times.
- the operation of the loom is stopped by dropping the main shaft rotation rate to the stop rotation rate by the regenerative braking in the first braking step, and then stopping the rotation of the main shaft 10 by the electromagnetic braking in the second braking step.
- the electromagnetic braking is applied to the main shaft 10 after the main shaft rotation rate has been dropped to the stop rotation rate by the regenerative braking, and hence a load that is applied to the mechanical element or the like by the electromagnetic braking is reduced.
- the main shaft rotation rate from the steady rotation rate toward the stop rotation rate is dropped by the regenerative braking and the regenerative braking is performed a plurality of times in a divided manner, and the change amount of the command rotation rate (the rotation rate drop amount) in each regenerative braking is 200 rpm. Accordingly, the regenerative electric power that is generated by each regenerative braking is reduced.
- the command rotation rate is changed every period corresponding to two rotations of the main shaft 10. Consequently, the regenerative electric power that is generated by each regenerative braking is substantially absorbed by the above-described resistor or the like until the next regenerative braking is started.
- the steady rotation rate is high as described above, a situation in which the resistor or the like cannot completely absorb the regenerative electric power generated by the regenerative braking does not occur.
- the embodiment an embodiment of a loom according to the present invention
- the present invention is not limited to the one described in the embodiment, and other embodiments (modifications) described below can be implemented.
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Claims (4)
- Procédé de mise à l'arrêt d'un métier à tisser, le métier à tisser comprenant un dispositif de commande (30), qui régule la rotation d'un arbre principal (10) sur la base d'une vitesse de rotation régulée prédéterminée, et un frein électromagnétique (60) qui freine l'arbre principal (10), le dispositif de commande (30) étant conçu pour réguler la rotation de l'arbre principal (10) sur la base d'une vitesse de rotation stable prédéfinie en fonctionnement stable, le dispositif de commande (30) étant également conçu pour exécuter une première étape de freinage qui est démarrée à un instant auquel une instruction d'arrêt a été générée ou après, la première étape de freinage abaissant une vitesse de rotation de l'arbre principal (10) vers une vitesse de rotation d'arrêt prédéterminée qui est inférieure à la vitesse de rotation en fonctionnement stable ; et
une deuxième étape de freinage d'actionnement du frein électromagnétique (60) à un instant auquel la vitesse de rotation a atteint la vitesse de rotation d'arrêt ou après et de freinage de l'arbre principal (10), la deuxième étape de freinage arrêtant la rotation de l'arbre principal (10), le procédé étant caractérisé en ce que la vitesse de rotation de l'arbre principal dans la première étape de freinage est abaissée par changement de la vitesse de rotation régulée d'un facteur deux ou plus ; et en ce que
la vitesse de rotation régulée est changée dans la première étape de freinage à chaque période d'une rotation ou plus de l'arbre principal (10). - Procédé de mise à l'arrêt du métier à tisser selon la revendication 1, la première étape de freinage étant effectuée sur la base d'une quantité d'abaissement de vitesse de rotation prédéfinie et de la période.
- Métier à tisser comprenant un moteur d'entraînement (20) qui entraîne en rotation un arbre principal (10), un détecteur d'angle (50) qui détecte un angle de rotation de l'arbre principal (10), un dispositif de commande (30) qui commande l'entraînement du moteur d'entraînement (20) sur la base d'une vitesse de rotation régulée prédéterminée et un frein électromagnétique (60) qui freine l'arbre principal (10), le dispositif de commande (30) comprenant une unité de stockage (34A) qui stocke une information de vitesse de rotation qui est une information relative à la vitesse de rotation régulée et qui est obtenue à l'aide d'une vitesse de rotation d'arrêt prédéterminée et d'un nombre prédéterminé de moments de changement de la vitesse de rotation régulée et une unité d'entraînement qui entraîne le moteur d'entraînement (20) sur la base d'une instruction d'entraînement, le dispositif de commande (30) étant également conçu pour réguler la rotation de l'arbre principal (10) sur la base d'une vitesse de rotation stable prédéfinie en fonctionnement stable, le métier à tisser étant caractérisé en ce que le nombre prédéterminé de moments de changement de la vitesse de rotation régulée est de deux ou plus et
l'unité de stockage (34a) stocke une information de période qui est une information pour déterminer une période dans laquelle la vitesse de rotation régulée est changée et selon laquelle la période est définie à une période d'une rotation ou plus de l'arbre principal (10) et
le dispositif de commande (30) comprend une unité de commande d'entraînement (34) qui reçoit une entrée d'information d'angle qui est obtenue sur la base d'un signal de détection provenant du détecteur d'angle (50), qui obtient, pour un premier instant de changement de la vitesse de rotation régulée sur la base de la génération d'une instruction d'arrêt et pour un deuxième instant de changement ou après de la vitesse de rotation régulée obtenu sur la base de l'information d'angle et de l'information de période par rapport au premier instant de changement, la vitesse de rotation régulée correspondant à chacun des instants de changement à partir de l'information de vitesse de rotation et qui délivre une instruction d'entraînement sur la base de chacune des vitesses de rotation régulées obtenues à un instant de changement correspondant parmi les instants de changement. - Métier à tisser selon la revendication 3,
l'information de vitesse de rotation comprenant une quantité d'abaissement de vitesse de rotation prédéfinie.
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JP2018135612A JP7441585B2 (ja) | 2018-07-19 | 2018-07-19 | 織機の停止方法及びその停止方法を実現するための織機 |
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CH649587A5 (de) * | 1980-08-27 | 1985-05-31 | Saurer Ag Adolph | Steuereinrichtung fuer die elektromagnetische bremse einer textilmaschine. |
JPS6115574A (ja) * | 1984-06-29 | 1986-01-23 | Tsubakimoto Chain Co | 電動機の急減速方法及び装置 |
JP2715113B2 (ja) * | 1988-09-22 | 1998-02-18 | 津田駒工業株式会社 | 織機回転数の最適制御方法 |
JP3138087B2 (ja) | 1992-11-09 | 2001-02-26 | 津田駒工業株式会社 | 織機の定位置停止制御装置 |
JP3446325B2 (ja) * | 1994-08-23 | 2003-09-16 | 株式会社豊田自動織機 | 織機の回転数制御装置及び回転数制御方法 |
JP3316536B2 (ja) * | 1998-09-24 | 2002-08-19 | 津田駒工業株式会社 | 多色緯入れ織機の緯入れ方法およびその装置 |
JP4524855B2 (ja) * | 2000-05-22 | 2010-08-18 | 株式会社安川電機 | Pwm制御インバータ |
JP2003201650A (ja) * | 2001-12-28 | 2003-07-18 | Tsudakoma Corp | 巻取装置または送出装置 |
DE10236095B3 (de) * | 2002-08-07 | 2004-02-05 | Lindauer Dornier Gesellschaft Mbh | Verfahren zum Betreiben einer Web- und einer Fachbildemaschine bei separaten Antrieben |
JP4152215B2 (ja) * | 2003-02-12 | 2008-09-17 | 株式会社豊田自動織機 | 織機における制動制御装置 |
JP2005027410A (ja) * | 2003-07-01 | 2005-01-27 | Tsudakoma Corp | 誘導電動機の駆動方法および駆動装置 |
JP2007332477A (ja) * | 2006-06-13 | 2007-12-27 | Tsudakoma Corp | 織機の駆動装置 |
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