JPH045775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed position stop control method in a loom which is directly controlled by a microcomputer.

With the spread of microcomputers in recent years, we have seen the emergence of looms that are directly controlled by microcomputers. This microcomputer control (1) prevents defective production due to incorrect operation or stop motion failure, and (2) improves the ability to detect abnormalities and failures in the control system, making maintenance easier. (3) It is expected that there will be benefits such as diversification of specifications through programs and increased flexibility in changing them.

Therefore, special control, which is almost impossible with conventional looms that are not controlled by a microcomputer, can be achieved relatively easily. As this special control, the present invention refers to a fixed position stopping operation in a loom. Stopping at a fixed position refers to stopping the entire loom system at a predetermined position when the motor of the loom is stopped due to warp thread breakage, weft thread breakage, or other abnormality. The position here specifically means the crank angle of a crankshaft (main shaft) that is interlocked with the motor. The crank angle of this crankshaft defines the operating timing system of the loom.

However, when stopping the motor, it cannot be guaranteed that the motor will always stop at a constant crank angle. This is because a constant braking force cannot be maintained for a long period of time due to various factors such as wear of the brake connected to the motor. If stopping at a fixed position is not ensured, the loom will stop in a manner that is inconvenient for repairing the weft or warp, for example.
Furthermore, for example, in a loom equipped with an air-jet type weft insertion device, there is a risk that the loom may stop with air still being blown out.

Conventionally, when such a deviation in the fixed position occurs,
Previously, the operator had to manually adjust it and stop it at the original fixed position. However, with the help of a microcomputer, special fixed-position stop control that does not require such manual operations can be realized. The applicant has filed a patent application to realize this special fixed position stopping operation.
No. 56-57822 (Japanese Unexamined Patent Publication No. 57-176242) was already proposed (detailed later). This is a fixed position for stopping the loom at a predetermined constant position in the operation timing system by starting the brake operation when the operation timing system of the loom reaches a predetermined brake operation start position. In the stop control method, the step of detecting and storing the deviation between the fixed position and the actual stopping position that occurred in the previous braking operation, and the step of detecting and storing the deviation between the predetermined brake operation start position and the actual stop position in preparation for the start of the current brake operation. , a step of performing calculations for adding correction using the deviation stored in the step, and detecting the operation timing system and starting the brake operation when the brake operation start position with the correction added is reached. This method is characterized by comprising a step of starting the braking operation, and a step of detecting the deviation in the current braking operation and storing it for the next braking operation.

In this way, automatic correction for stopping at a fixed position is finally added, and the operation timing system always stops at a proper fixed position. Moreover, this frees the operator from monitoring the localization value stoppage, which is effective in saving labor. However, on the other hand, it is up to the operator to determine whether the crank angle stopped at the fixed position while completing one specified revolution, or whether the crank angle idled several revolutions beyond the specified range and stopped at the fixed position. I don't know because there will be no monitoring.
Usually, a series of operations such as warp insertion and reed beating are performed repeatedly, and each of these series of operations starts and ends during a period corresponding to one rotation angle of the crank angle. If the above-mentioned idle running occurs over several revolutions of the crank angle, the series of operations described above will be performed several times without warp threads. As a result, streaks appear on the finished fabric (corresponding to so-called stoppages) corresponding to the idle running, which significantly deteriorates the quality.

The reason why the above-mentioned crank angle idling occurs even though the automatic correction for finally stopping at a fixed position is performed is mainly due to the sudden decrease in braking force. For example, various causes include rapid wear of the brake, intrusion of fluff into the brake surface, and formation of an oil film on the brake surface. In any case, the fixed position stop control must be completed within one crank rotation angle. If the rotation is not completed within one crank rotation angle, a contradiction arises in that the braking operation in the automatic correction for stopping at a fixed position must be started before the braking force suddenly decreases.

In view of the above circumstances, it is an object of the present invention to propose a fixed position stop control method for a loom that does not cause the quality deterioration described above.

In accordance with the above object, the present invention includes a step of comparing the crank angle b required for braking with a predetermined crank angle h, and generates a warning when it is detected that the crank angle b exceeds the crank angle h. It is characterized by the following. In addition, depending on this warning, it is up to you whether to cancel the automatic correction for stopping at a fixed position and switch to manual operation, to adjust or replace the brake as soon as possible, or to ignore the quality deterioration and continue weaving the loom. It depends on the decision of the user.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic diagram schematically showing the general configuration of a loom to which the present invention is applied. In this figure,
101 is a yarn beam with a large number of warps 102
are wound in parallel. These warp threads 102 are connected to a back roller 103 and a tension roller 104.
The threads reach the warp fixing device 105 via. The warp stopping device 105 has a dropper (not shown) for each warp thread, and when any warp thread breaks, the corresponding dropper detects this and starts operations such as stopping the machine. The warp threads passing through the device 105 are held down by the warp presser bar 106, and then moved to the heald frame 107-1,
107-2 is alternately divided into upper and lower halves to form an opening 108. A weft yarn is inserted into this opening 108 at high speed from a weft supply device (not shown), for example, an air jet nozzle. Guidance for this insertion is provided by a weft insertion guide 110 provided on the sleigh 109. This sleigh 109 is also provided with a reed 111. Reed 111 is Srey 1
By the swinging motion of 09, each time a weft is inserted, it is hit to the right side in the figure, and a cloth 112 is formed here. The sleigh 109 performs the rocking motion by a locking shaft 114 via a slay sword 113.

The woven cloth 112 is a pressed beam 115,
Surf S roller 116 and press roller 11
7 and is wound up by a winding roller 118. 119 is a wound woven fabric.

The driving source for the above-mentioned operation is provided by the motor 120 and transmitted to the driving pulley 122 via the motor pulley 121,
Rotate 3. This rotational driving force is applied to a predetermined location along the route of the wavy arrow in the figure. Note that the rotational driving force for the yarn beam 101 is provided by a transmission 124.
A feedback signal from the tension roller 104 is supplied to the transmission 124 along a route indicated by a dotted wave-shaped arrow in the figure. This is to give a predetermined tension to the warp threads 102.

The looms to which the present invention is preferably applied are directly controlled by a microcomputer provided for each loom, and the overall operation is managed. This microcomputer is schematically shown at 130 in FIG. This is a signal line that should be connected to the /O port (Input/Output port).

FIG. 2 is a perspective view depicting the portions of FIG. 1 particularly relevant to the present invention in slightly more detail. In this figure, 120 to 123 are as explained in FIG. 1. A brake device 21 is directly connected to the main shaft of the motor 120 (the brake device may be provided at a predetermined position of the loom drive system such as the crankshaft). When stopping the motor 120, the motor power P is turned off and the brake power B is supplied to the brake device 21.
Then, the crankshaft 123, which had been rotating via the pulleys 121 and 122, suddenly stops. Normally, this stop occurs when the crankshaft 12
Completed within one rotation of 3 (as described above). In this case, the crankshaft 123 must stop at a certain stop position (crank angle position). For this purpose, the crankshaft is usually provided with a crank angular position detection device 22, which constantly monitors the current crank angular position. The device 22 includes, for example:
It consists of a disk 22-1 having teeth formed on its periphery at equal intervals and a sensor 22-2 fixed close to the disk. As each tooth approaches sensor 22-2, for example by magnetic coupling, sensor 22-2
2 outputs a crank angle pulse CP in the form of a pulse train. In order to define the absolute angle of the crank angle pulse CP, a permanent magnet 22-3 is provided at one predetermined location on the disc 22-1, and this becomes a so-called home position.

In addition to the one that counts pulses as shown in the figure, the crank angle position detection device also uses an absolute encoder (a device that forms a code pattern such as a binary code that directly represents the angle on a disk and can directly detect the angle as a numerical value). ) may be used.

Thus, when a stop request signal to temporarily stop the loom is generated, the brake starts to be applied from a predetermined crank angle position, and the crankshaft 123 stops rotating at a predetermined position.

FIG. 3 is a block diagram showing an example of a configuration for implementing the method proposed in Japanese Patent Laid-Open No. 176242/1982. The motor 120, brake 21, and crank angle position detection device 22 in this figure have already been
This is as explained in the figure. These motor 120 and brake 21 are controlled by a control circuit 32. A stop request signal S is sent to the control circuit 32.
When is applied, the crankshaft is braked toward the home position set by the stop position setter 31. 33 is a comparison/arithmetic circuit, and 34 is a storage circuit. In this diagram, these circuits are depicted as discrete modules, but
Actually, it is included in the microcomputer 130 and is program-controlled. The following is JP-A-57-
The method disclosed in Publication No. 176242 will be explained in detail again. Figure 4 is a graph schematically showing the concept of crank angle, and Figures 5A and 5B are graphs from Japanese Patent Application Laid-open No. 57
This is a flowchart showing the method disclosed in Japanese Patent No. 176242 broken down into steps. In Figure 4 a
is the crank angle position at which the brake operation starts, and c is the crank angle position representing the fixed position at which the brake is to be stopped. This crank angle position c is determined by the stop position setter 3 in Fig. 3.
Digitally preset by 1. According to the settings shown in Figure 4, it is approximately 300°. However, since the braking force is not always constant, the engine actually leaves the crank angle position c and stops at the crank angle d. However, the crank angle d is variable. Crank angle b means the angle required for braking. In FIG. 5A, first, a stop request signal (S in FIG. 3) is generated (step). The digital preset value (c in Fig. 4) set in the stop position setter (31 in Fig. 3), the comparator/calculator (3 in Fig. 3)
3) Input (step). The timing is determined by instructions from the control circuit (32 in FIG. 3). Note that the double-line arrows in FIG. 3 indicate the flow of data, and the single-line arrows indicate the flow of control signals.
The comparator/calculator 33 executes the calculation e←c−b (step). It should be noted here that the value of b indicates data detected in the immediately previous braking operation. In other words, the positional deviation of the previous stop at a fixed position is stored and used as data for adjusting the current braking operation. The data on the positional deviation caused by the current braking operation is reflected in the next braking operation. Therefore, data b
will be stored in the memory circuit (34 in FIG. 3). Since this data b must be reflected in the next restart of operation even if the loom is stopped for a while (power cut off), the storage circuit must be a non-volatile memory. Thus, in the step, data e is calculated. This data e is a value in the middle of calculation, and means the value at which the motor would have stopped at a fixed position if this data e was used instead of data a. Further, in a step, g←(ea)×γ+a is calculated. Here, γ represents a so-called correction factor, and is selected to be γ=1/2, for example. If this correction factor γ is γ=1, then
100% correction will be made each time, but 100%
If correction is performed, the feedback result will be vibration due to various disturbances, errors, etc., and there is a possibility that it will not converge to the crank angular position c.
A value of 1 or less is selected.

Since this data g was a positive or negative value in the previous calculation, it is determined whether it is positive or negative (step). If positive (YES), replace g as is with a (step); if negative (NO), add 360° to g and replace with a (step 6'). All of the above operations are performed mainly by the comparator/calculator 33.

Here, the crank angle position detection device (2 in Fig. 3)
2) is crank angle position a (brake operation start angle)
Detect whether or not is g (or g+360) (step). If they do not match (NO), continue detection until they match (YES). If they match, the loom starts to stop (step). That is, the control circuit 32 in FIG. 3 de-energizes the motor 120 and energizes the brake 21 at the same time.

In this way, stopping at a fixed position is almost ensured. In this case, for the next brake operation,
The actual stopped crank angle b that should be detected during the current brake operation must be measured.
Therefore, the flowchart moves from FIG. 5A to FIG. 5B. First, the step waits for the loom to come to a complete stop. After stopping, the position is read in step. This reading is performed by the crank angular position detection device 22. The actual stop position (crank angle position d) is determined here (step). Based on this data d, (da-a) is calculated (step) to obtain the next adjustment data b. In the end, the data b used in step (Figure 5A)
This means that the data obtained by the step in the previous brake operation mode is used.

Next, the present invention will be described, and most of the steps are exactly the same as those already described, except that the flowchart shown in FIG. 5B described above is changed (steps are added).

FIG. 6 is a graph for explaining the present invention using crank angles, and is a slightly enlarged version of FIG. 4. In FIG. 6, d indicates the crank angular position at which the engine actually stopped, and this crank angular position d varies forward or backward relative to a predetermined crank angular position c. In the present invention, a problem arises when the crank angular position d significantly exceeds the crank angular position c. That is, the reference crank angle h (the crank angle required for a to h, which is set at a crank angle position of 350°, for example) is further advanced from the crank angle position c (often set between 270° and 300°). ), and if the braking force decreases to such an extent that the crank angle b required for braking exceeds the crank angle h, a warning is issued. Although the crank angle position corresponding to the crank angle h is, for example, 350°, it is preferable to set it as appropriate by the user of the loom. In short, the crank angle h is the reference value that indicates the limit in which the series of operations to be restarted next cannot be completely executed if the engine stops at an advanced angle. Therefore, it is necessary to add a block to the block shown in FIG. 3 for setting the reference value in advance. FIG. 7 is a block diagram showing a configuration example for carrying out the method of the present invention, in which a reference value (crank angle h) is set by a new block 71, and this is stored via the comparison/arithmetic circuit 33. It is stored in the circuit 34. After preparing the reference value in this way, the fifth
Modifications are made to the flowcharts shown in Figures A and 5B. In particular, several steps are added to the flowchart of FIG. 5B. FIG. 8 shows the 5B according to the present invention.
It is a figure which shows the new flowchart which added the change to the flowchart of the figure. Steps in Figure 8,
and are specifically added by the present invention. Steps are optional. The data b (crank angle required for braking) obtained in step is reflected as the next adjustment data for the step in Figure 5A, but this data b shows the appropriateness of the current braking force. It is something. Whether the braking force is appropriate or not is determined by a comparison with a reference value (crank angle h), so first, the reference value already set by the memory circuit 34 in FIG. 7 is read (step). Then, a comparison is made between the crank angle b and the reference value h in steps, and if b > h (NO), it is normal.
Return to steppe. If b>h (YES),
The brake force is insufficient and a warning is issued immediately (step). As already mentioned, this warning will determine whether to cancel the automatic correction for stopping at a fixed position and switch to manual operation, adjust or replace the brake as soon as possible, or ignore the quality deterioration and continue weaving. This is indicated as a step ("treatment") because it is optional for the user of the loom.

As explained above, according to the present invention, by introducing automatic correction for stopping in a fixed position, it is now possible to monitor abnormal idling when the brake is applied, which has become difficult to monitor, on the machine side, making it more reliable. A highly maintenance-free loom is realized.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram schematically showing the general configuration of a loom to which the present invention is applied, FIG. 2 is a perspective view depicting parts of FIG. 1 particularly related to the present invention in slightly more detail, and FIG. The figure is a block diagram showing an example of a configuration for implementing the method proposed in JP-A No. 57-176242, Fig. 4 is a graph schematically showing the concept of crank angle, and Figs. 5A and 5B are Unexamined Japanese Patent Publication 1987-
A flowchart showing the method disclosed in Japanese Patent No. 176242 broken down into steps, FIG. 6 is a graph for explaining the present invention using crank angles, and FIG. 7 is a diagram for implementing the method of the present invention. FIG. 8, a block diagram showing an example of the configuration, is a diagram showing a new flowchart obtained by modifying the flowchart of FIG. 5B according to the present invention. 120... Motor, 123... Crankshaft, 21... Brake device, 22-1, 22-
2, 22-3...Crank angle position detection device, a...
...Brake operation start position, b...Crank angle required for braking, c...Stop position, h...Reference value.

Claims (1)

[Claims] 1. By starting the brake operation when the operation timing system of the loom reaches a predetermined brake operation start position, the loom is brought to a predetermined fixed position in the operation timing system. A fixed position stop control method for stopping the vehicle, the first step of detecting and storing a deviation between the fixed position and the actual stopping position that occurred during the previous braking operation;
a second step of performing a calculation to correct the predetermined brake operation start position using the deviation stored in the first step in preparation for the start of the current brake operation; and a second step of calculating the operation timing system. a third step in which the brake operation is started when the operation timing system reaches the brake operation start position with the above-mentioned correction; and a third step in which the above-mentioned deviation in the current brake operation is detected and the brake operation is prepared for the next brake operation. A fourth step of memorizing a fixed position stop control method for a loom, comprising: a predetermined value that is permissible for the deviation between the fixed position and the actual stop position detected in the first step; A step of reading a reference value from a predetermined storage portion and a step of comparing the read reference value and the actual deviation are inserted between the first step and the second step. , in a loom, characterized in that when the actual deviation does not exceed the reference value, the process proceeds to the second step, and conversely, when the actual deviation exceeds the reference value, the process proceeds to the step of generating a warning. Fixed position stop control method. 2. The local position value stop control method for a loom according to claim 1, wherein the process starts from the step of generating the warning and returns to the second step after a predetermined warning cancellation procedure.