KR20050009671A - Method of operating weaving machine that runs quickly - Google Patents

Abstract

PURPOSE: An operating method of a rapid travelling loom is capable of improving control motion of a moved part. CONSTITUTION: A rapid travelling loom(1) contains at least one of driving parts. An absolute position of the driving part is detected by an absolute-value providing part(15). The absolute position is delivered to a controlling part(14). Increment of a position of the driving part is detected when operating velocity is exceeded. Increment value of the driving part is estimated when the driving part is moved. The absolute position of the driving part is detected when the driving part is stopped, and is set on a non-volatile memory(21).

Description

Method of operating weaving machine that runs quickly}

The present invention relates to a method for operating a rapid running loom having at least one drive unit for detecting and transmitting an absolute position of the drive unit using an absolute value providing unit.

In the following, the present invention will be described taking an inclined loom as an example. In warp looms, various weaving members such as, for example, weaving needles, placement needles, plates and the like interoperate. Each of the individual weaving members is fixed to a bar in a group manner. The fabric can be produced by controlling the movement of the bar. In the past, the movements of the individual weaving members were mechanically connected to each other. The central drive operation of all the weaving members was performed by the main shaft of the warp loom. In order to join the weaving member, a relatively complicated gear part is required. Due to the gear portion, pattern formation is limited and it is difficult to replace the pattern.

Therefore, in recent years, the trend has been to use the electric drive unit. In this case, in general, mechanical coupling of different woven members is not considered. Therefore, in order to control the weaving member, information indicating whether or not the weaving member is present is necessary. The information is the simplest information about the position of the drive. Hereinafter, the "position of the drive part" does not mean the insertion position of the drive part in the loom, but the output of the member mechanically connected to the drive part relative to the position of the output part of the drive part or the static portion of the drive part. It means the position of negative. When a rotary drive is used as the drive, the position of the drive is the angular position of the rotor relative to the stator.

The position of the drive unit is used for the control unit. The drive control section used here controls the drive section so that the position of the drive section is set to a predetermined default.

In particular, the absolute position of the drive unit must be recognized when driving the inclined loom. For this reason, an absolute value providing unit which detects the absolute position of the drive unit and transmits it to the control unit should be used. In addition, when the driving unit moves, the absolute position is detected and transmitted to the control unit. This is the case when the warp loom is technically practicable on the fly at low operating speeds. If the operating speed of the warp loom increases, problems arise. In this case, the amount of data to be transmitted correspondingly increases. This amount of data can be copied using any means currently available in the art. Thus, such a machine is relatively expensive.

An object of the present invention is to improve the control operation of the moved part when the rapid running loom operates.

1 is a very schematic and simplified illustration of a warp loom.

This object is solved by the method of operating the first mentioned rapid running loom which incrementally detects the position of the drive when a predetermined operating speed is exceeded.

When the loom exceeds the predetermined operating speed, the absolute value measurement is stopped and the detection of the change of the position of the drive unit relative to the preset position is limited. This can significantly reduce the amount of data to be transmitted. In most cases, an analog signal is transmitted and an increased resolution is obtained in the control unit. Here, the necessary " intelligence ", i.e. the necessary arithmetic ability, can generally be used. In addition, detecting the increment value generated by the control unit has an advantage of realizing a high resolution substantially. The absolute value providing unit can use only a predetermined number of positions that can be actually evaluated for spatial reasons. Detecting an incremental value from an analog signal can increase the resolution approximately four times, for example, a factor of 10 to 100 or more. Thus, a more precise position can be set. Accordingly, the control operation of the drive unit is remarkably improved. Of course, since an increment value may occur in the absolute value providing unit, information about the digital type increment may be used at the output of the absolute value providing unit. In the simplest case, it is necessary to transmit only one bit of information instead of a value that includes the absolute position of the drive unit and can generally be represented by a number of bytes. Therefore, not only the data transmission is simplified, but also the measurement by the controller is simplified, so that the data can be implemented more quickly. In addition, the reduction of the amount of information has the advantage of reducing the possibility of interference. For example, if external data is lost due to interference, this interference only works incrementally. Incremental values of this type correspond to, for example, lengths of 1/100 mm. On the contrary, the interference generated during absolute position propagation may affect a relatively large adjustment path. This problem occurs when the analog signal is transmitted from the location providing unit to the control unit. At present, this approach is preferred.

Here, it is preferable to absolutely detect the position in the stationary state of the driving unit, to transmit the absolute value to the control unit, and to evaluate the increment value when the driving unit moves. In this case, the predetermined operating speed is zero. As the operating speed increases, the position of the drive, ie the angular position of the rotor relative to the stator, is incrementally detected. Here, since it can be separated from the absolute position detected in the stop state, it is possible to actually use information necessary for the control of the drive unit for the entire movement period of the drive unit.

Preferably, the absolute position of the drive unit is detected and stored in the nonvolatile memory in the stationary state of the drive unit. Therefore, when re-running each of the driving units, information on whether the driving unit is in a stopped state may be used. By using the information, it is possible to control the traveling operation substantially better.

Here, it is preferable to use the stored auxiliary energy to detect the absolute position. Thus, it is protected against interference that may be caused by interruption of energy supply. For example, if electrical energy is no longer used to operate the loom for reasons of net loss or another interruption, the auxiliary energy can be used retrospectively to detect the absolute position of the drive. Here, for example, the auxiliary energy may be stored in a battery or an accumulator.

Preferably, before the movement occurs using the drive unit detects the actual absolute position of the drive unit and compares the actual absolute position with the stored absolute position and the difference between the stored absolute position and the actual absolute position Take corrective action in consideration. By stopping the loom for a predetermined time, the drive can be adjusted, for example, during shutdown at the end of the floor or during the weekend. In this case, the absolute position when driving no longer coincides with the stored absolute position. Accordingly, interference may occur in adverse cases. To prevent this kind of interference, the drive is calibrated so that the risk of interference is small. Since the stored absolute position is well known, it can be used as a reference between the stored position and the actual position.

Preferably, a plurality of drives for controlling the main axis of rotation and the arrangement bar is used, and if the actual absolute position of the drive portion of the placement bar does not match the stored absolute position of the drive portion of the placement bar, Move the drive to the stored position. In this case, the so-called stored start situation occurs again. This is a relatively simple way to ensure interference free driving.

Here, if the actual absolute position of the main axis of rotation does not match the stored absolute position of the main axis of rotation, it is preferable to move the drive portion of the placement bar to a position corresponding to the actual position of the main axis of rotation. At this time, the main axis of rotation generally has a preferred direction of rotation and it can be considered that the drive of the main axis of rotation is generally the strongest drive in the loom. Instead of giving up the change of the position of the main shaft, the absolute position of the placement bar is adjusted to the actual absolute position of the main shaft. The position of the placement bar belongs to each position of the main shaft, that is to say, to each position of the drive portion of the main shaft. This relationship is well known. Therefore, it is possible to track the arrangement bar of the main shaft. The main axis of rotation is used as a so-called "master" while the drive of the placement bar is used "secondarily".

Preferably, an absolute value providing unit which does not change periodically is used and the driving unit is shut off. The periodically changing absolute value providing portion is not distinguished in individual main periods, but detects only one position, for example, the position of the drive portion at the angular position of the rotor with respect to the stator. Here, it is not important whether the first, second, or nth rotation is important. This kind of absolute value provider is relatively cost-effective to use. The absolute value providing portion is sufficient to be used for detecting the position of the driving portion before implementation. When the position of the drive unit is prevented from being changed to a considerably large dimension in this stationary step by blocking the drive unit in a stationary state, using an absolute value providing unit that does not change periodically is a stored absolute position and an actually detected absolute position. It is sufficient to carry out the necessary corrective action after comparison with. At this time, this blocking operation will not be performed perfectly. The drive can be moved slightly. This weak movement does not exceed the period. In addition, the driving unit should not be blocked inside or at the driving unit itself. In order to prevent movement of the weaving member driven by the driving unit, in general, it is possible to block or control the movement of the member, for example, a bar.

Here, when correcting the position of the driving unit in the difference between the actual absolute position and the stored absolute position, if the difference is smaller than a predetermined ratio of the period, the period limit value is exceeded. The stored value does not necessarily exist within one period. For example, if the absolute value 100 is detected per cycle and the stored position is 10 and the actually transmitted position is 90, then the drive is not calibrated from 10 to 90 in the same period, but from 10 to 90 within the existing period. Calibrate above the periodic limit value.

In this case, the ratio is preferably at most 49%. That is, it can actually calibrate more than half of the period.

Preferably, a sine / cosine provider or resolver is used as the absolute value provider. Two kinds of absolute value providing units are released today at a replaceable cost and can be used well in combination with a control unit, driving unit, providing unit and evaluation unit.

The invention will be described with reference to the accompanying drawings in accordance with an embodiment of the invention.

The warp loom 1 has a main shaft 2 which is driven to rotate in the direction of the arrow 3. The driving unit 4 is provided to rotate the main shaft 2. As the drive unit 4, for example, an electric motor connected to the main shaft 2 by a coupling 5 is provided.

The main shaft 2 is connected to the weave needle bar 7 by means of a connecting member 6, which is only schematically shown. The weave needle bar 7 includes a plurality of weave needles 8 and oscillates left and right in the direction of the double arrow 9.

The placement bar 10 includes a plurality of placement needles 11. The arrangement needle 11 is present at the position of the needle passage between the illustrated weave needles 8. The placement bar 10 is connected to the driver 12. The driving unit 12 moves the placement bar 10 side to side in the direction of the double arrow 13. In operation, the movement of the weave needle 8 (vibration movement) and the placement needle 11 (linear transfer movement) is continuously adjusted to form a fabric. Of course, the loom 1 has another weaving member, such as a latch plate, a temporary plate or the like, which can likewise be fixed to the bar 10. In addition, one or more placement bars may be provided. Each of these bars may have its own drive or may be connected to another bar or to the drive of the main shaft 2. For the sake of simplicity, the very simple example shown above will be explained. Delivery to multiple drives can be performed on the fly by a specialist.

The two drives 4, 12 are formed of an electric motor. Here, servomotors, for example synchronous motors excited with permanent magnets, are particularly suitable. It is also possible to use asynchronous motors, direct current motors or step motors, which can be used when such a motor can position the main axis of rotation 2 or the placement bar 10 very precisely.

In order to control the positioning, a control unit 14 is provided. The control unit 14 controls the driving units 4 and 12 by, for example, an impulse.

The drive unit 4 has an absolute value providing unit 15. The absolute value providing unit 15 detects the absolute position of the drive unit 4. At this time, the position of the member moved in the drive unit 4 with respect to the static element, for example, the angular position of the rotor relative to the stator can be recognized as an "absolute position". . Similarly, the drive unit 12 also includes an absolute value providing unit 16 that transmits the absolute position of the drive unit 12. The two absolute value providing units 15 and 16 may be formed as absolute value providing units which do not periodically change. In other words, the absolute value providing portions 15 and 16 generate the absolute value only during the rotation of the drive portion. This is usually sufficient. As the absolute value providing units 15 and 16, for example, a sine / cosine providing unit or a resolver may be used. Of course, instead of the periodically unchanging provision, which is characterized by a "single rotation" provision, it is possible to use a so-called "multiturn" provision which can actually detect the absolute position via a relatively large rotation area.

The absolute value providing unit 15 transmits the absolute position of the driving unit 4 of the main shaft 2 to the control unit 14. The absolute position of the main shaft 2 is transmitted from the position of the drive 4, more precisely from the position of the moved part present in the drive 4. The illustration of the absolute position requires a relatively large amount of data, for example a large number of bytes. To clarify this, a large data line 17 is shown. The absolute position of the driver 4 may be transmitted to the controller 14 through the data line 17.

Similarly, the absolute value providing unit 16 also transmits the absolute position to the control unit 14 via the data line 18.

As long as this data transfer is performed in sufficient time, there is no problem. This is a case where there is no problem not only in the stationary state of the main rotating shaft 2 but also in the stationary state of the placement bar 10. Even in the slow movement of the main shaft 2 and the placement bar 10, no problem arises in the transfer of the absolute position of the placement bar driver 12 and the main shaft drive unit 4.

In addition, the warp loom 1 should be operated at a high speed of operation. In this case, the absolute value may be transmitted to the controller 14 through the data lines 17 and 18 without change. However, it is necessary to consider the cost of transmitting a large amount of data in a short time.

In order to solve the problem, when the driving units 4 and 12 are moved, the position of the driving units 4 and 12 is incrementally detected without using the absolute value of the position any more. To this end, the binary coded information, i.e., the digital signal is no longer transmitted, but an analog signal, for example, the sine and cosine signals of the sine / cosine providing unit. To illustrate this, lines 19 and 20 are shown. The lines 19 and 20 should not be physically present. Like the absolute value of the position, it is obvious that the analog value can be physically transmitted over the same line. In the control unit 14, the analog signal is measured by the corresponding fast analog-to-digital converter to obtain a high resolution increment that performs another positioning.

In order to operate the warp loom 1, the absolute positions of the drive units 4 and 12, unless the drive unit 4, 12 causes the movement of the main shaft 2 or the placement bar 10. Fix and transmit the absolute position to the control unit (14).

When the warp loom 1 is initialized and the driving units 4 and 12 are moved, that is, when the main shaft 2 and the placement bar 10 are driven, the absolute position value is no longer used. Use only the changed value for the absolute position, i.e., the increment value.

When the inclined loom 1 is stopped by a user's operation or a current drop and the machine is in a standby state, an absolute position of the main shaft drive unit 4 and the placement bar driver 12 is detected and the main shaft drive unit The absolute position of (4) is stored in the memory 21 and the absolute position of the placement bar driver 12 is stored in the memory 22. Since the two memories 21 and 22 are nonvolatile, the stored information may be stored even when supply energy is lost. In order to detect the position in the case where such supply energy is lost, a battery 23 and a capacitor or another energy storage unit for supplying the memories 21 and 22 and the absolute value providing units 15 and 16 are provided. .

When the inclined loom 1 stops, brakes 24 and 25 are activated to prevent further movement of the main shaft 2 or the placement bar 10. Of course, relatively small movements can be performed in an area of approximately millimeters (mm) or 3 °. The positions of the driving units 4 and 12 cannot be changed relatively large.

Before running the machine again, the absolute value providing unit 15, 16 fixes the actual position of the drive unit 4, 12 and compares the actual position with the position stored in the memory 21, 22. If a deviation occurs at this time, the deviation is corrected in the following approach.

If the actual position of the placement bar driver 12 does not match the stored position, the placement bar driver 12 is activated to reach the stored position.

If the actual position of the main shaft drive unit 4 does not match the stored position, the main shaft drive unit 4 is placed at the actual position and the placement bar drive unit 12 is operated. The placement bar driver 12 drives the placement bar 10 to a position corresponding to the position of the weave needle bar 7, that is, the main rotational shaft 2. Implementation can be performed at this location. It is important that the individual weaving members are aligned in a predetermined position.

In the absolute value providing unit 15, 16 which does not change periodically, the movement of the main shaft drive unit 4 or the arrangement bar drive unit 12 exceeds the cycle limit value during the stop time of the machine 1 occurs. For example, when the cycle of the placement bar driver 12 is divided into 100 steps and the position 10 directly fixing the position 10 later detected after the machine is stopped, the placement bar driver 12 Is preceded by 90 to 10 of the next period without actually trailing from 90 to 10 in the same period. The movement operation beyond this period is performed when the difference to the stored value is less than half of the period in the next or previous period. Only when the difference is greater than half of the period, the calibration operation is performed in the same period.

As described above, according to the present invention, it is possible to improve the control operation of the moved part when the rapid running loom operates by providing the method for operating the rapid running loom mentioned above.

Claims (11)

A method of operating a rapid running loom having at least one drive unit for detecting an absolute position of a drive unit and using the absolute value providing unit to transmit the detected position to the control unit, A method of operating a rapid running loom characterized by incrementally detecting the position of the drive unit when a predetermined operating speed is exceeded. The method of claim 1, wherein the position of the driving unit is detected at an absolute state, the absolute value is transmitted to the control unit, and an increment value is evaluated when the driving unit moves. The method of claim 1, wherein the absolute position of the drive unit is detected and stored in a non-volatile memory in the stationary state of the drive unit. 4. A method according to claim 3, wherein the stored auxiliary energy is used to convey the absolute position. 4. The method according to claim 3, wherein the actual absolute position of the driving unit is detected using the driving unit before the movement operation occurs, and the actual absolute position is compared with the stored absolute position, and the stored absolute position and the actual absolute position. Method for operating a rapid weaving loom, characterized in that to perform a calibration operation in consideration of the difference with. 6. The arrangement according to claim 5, wherein a plurality of driving portions for controlling the main axis of rotation and the arrangement bar are used, and the arrangement is made if the actual absolute position of the drive portion of the placement bar does not match the stored absolute position of the drive portion of the placement bar. A method of operating a rapid running loom characterized by moving a drive of a bar to said stored position. 7. The method of claim 6, wherein if the actual absolute position of the main shaft does not match the stored absolute position of the main shaft, the driving unit of the placement bar is moved to a position corresponding to the actual position of the main shaft. How to operate a speed loom. 2. A method according to claim 1, wherein an absolute value providing unit which does not change periodically is used and the driving unit is shut off in a stationary state. 10. The rapid traveling loom according to claim 8, wherein if the difference is less than a predetermined ratio of periods in the position calibration of the drive unit in the difference between the actual absolute position and the stored absolute position, the rapid traveling loom is exceeded. How to work. 10. The method of claim 9, wherein the ratio is at most 49%. 2. The method of claim 1 wherein a sine / cosine provider or resolver is used as the absolute value provider.