JP2004100053A - Method for controlling restarting of loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of filling bars when a loom is restarted. <P>SOLUTION: A plurality of heald frames WF, WF, etc., are vertically moved without rotating a main shaft A to produce a sufficient warp yarn strain in a plurality of warp yarns Y, Y, etc., on condition that the loom is set on a restarting position. The loom is then restarted and transferred to regular operation on condition that the plurality of heald frames WF, WF, etc., are kept in a synchronous relationship with the main shaft A. Thereby, the continuity of the weft density is maintained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a loom restart control method that can effectively prevent the occurrence of a weaving step when the loom is restarted.
[0002]
[Prior art]
When a loom such as a jet loom stops due to, for example, a poor weft insertion or a power outage, the whole is reversed, and the weft that has a poor weft insertion or a weft that has a possibility of a poor weft insertion is spouted out and removed. Restart from the restart position and resume weaving.
[0003]
When the loom is restarted in this manner, the density of the weft near the weaving cloth may change discontinuously to cause a weaving step. In order to prevent this, for example, the warp is oscillated on the warp via an eccentric roller. It has been proposed that the loom be restarted while giving the same (Japanese Unexamined Patent Publication No. Hei 8-246296).
[0004]
[Problems to be solved by the invention]
According to such a conventional technique, there is a problem that the effect of preventing the weaving step is insufficient because the vibration of the warp caused by the eccentric roller is not sufficiently large. That is, during the steady operation, the weft in the woven fabric does not have a predetermined weft density by one beating, but has a normal weft density after several picks. The density changes continuously from coarse to dense. On the other hand, when the loom is restarted after stopping, even if weft insertion is restarted while applying vibration to the warp, the warp distortion is not the same as during steady operation, so the movement of the weft in the woven fabric due to beating is constant. It is inevitable that the continuity of the weft density will not be the same as during operation and the continuity of the weft density will be disturbed.
[0005]
Therefore, an object of the present invention is to solve the problem of the related art by rotating the heald frame up and down without restarting the main shaft, that is, with all devices other than the heald frame stopped, and restarting the loom. Another object of the present invention is to provide a method for controlling a restart of a loom, which can effectively prevent a weaving step caused by a disturbance in continuity of a weft density.
[0006]
[Means for Solving the Problems]
According to the configuration of the present invention to achieve the above object, at the time of restarting the loom, at least one heald frame is continuously moved up and down without rotating the main shaft on condition that the main shaft is set to the restart position. The gist is that the loom is restarted on condition that all heald frames are synchronized with the main shaft. However, the synchronous relationship here means that a predetermined relative phase relationship with respect to the main shaft is set so that each heald frame performs an opening movement in accordance with an opening pattern during a steady operation.
[0007]
The heald frame can be moved up and down according to a dedicated up and down movement pattern, and the heald frame can be moved up and down according to the opening pattern during steady operation.
[0008]
After the heald frame is moved up and down, it can be synchronized with the main shaft.
[0009]
Further, the heald frame can be moved up and down an integral number of times.
[0010]
[Action]
According to the configuration of the present invention, the loom has a warp warp necessary and sufficient for the warp by continuously moving the heald frame up and down without rotating the main shaft on condition that the main shaft is set to the restart position. And then restarted, provided that all heald frames are in synchronous relationship with the main shaft. That is, the weft at this time can be appropriately moved in the woven fabric by beating after the restart, maintaining the continuity of the weft density and preventing the weaving step. The heald frame is driven through a dedicated drive motor other than the main motor in order to move the main shaft up and down without rotating the main shaft, and the number and speed of the up and down motion are determined by, for example, the types of warp and weft yarns. It shall be set appropriately.
[0011]
For example, the number of up-and-down movements is about several reciprocations to several tens of reciprocations, and the speed can be the same as during steady operation, or can be faster or slower than during steady operation. That is, the speed of the vertical movement is preferably set to about 50 to 200% of the speed during the steady operation. If the speed is less than 50%, the handling of the warp becomes worse, and it is difficult to achieve a predetermined warp distortion. If the speed is more than 200%, excessive stress may be generated in the drive system of the heald frame. is there.
[0012]
If the heald frame is moved up and down according to a dedicated up and down movement pattern, the heald frame can be moved up and down continuously irrespective of the weave structure, and the time required for up and down movement can be minimized.
[0013]
When the heald frame is moved up and down according to the opening pattern during the steady operation, the heddle frame can make the warp distortion due to the up and down movement more approximate to the warp distortion during the steady operation.
[0014]
When synchronizing with the main shaft after moving the heald frame up and down, consider the heddle frame when the loom stops due to the inability to maintain the synchronous relationship with the main shaft due to, for example, a power failure, or the synchronous relationship with the main shaft. Even when the loom is arbitrarily moved up and down independently, the opening pattern after the restart of the loom can be reliably continued to the opening pattern before stopping. However, the heald frame at this time is synchronized with the main shaft based on the cycle number of the restart position and the crank angle so as to realize an opening pattern during steady operation.
[0015]
If the heald frame is moved up and down an integral number of times, the heald frame can be reliably returned to the position before the start of the vertical movement in synchronization with the main shaft at the end of the vertical movement, and is renewed with respect to the main shaft. There is no need to synchronize. However, in this case, the loom is assumed to be stopped while maintaining the synchronous relationship between the main shaft and the heald frame.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
[0017]
The shedding control device that implements the method of controlling the restart of the loom is a combination of the steady operation means 11, the synchronization means 12, the vertical movement means 13, and the drive control unit 21 (FIG. 1). However, in the same figure, the weaving machine typically shows a tension roller R1, a reed R2, and a guide roller R3, on the winding side of the woven fabric Ya, on the sending side of the warp Y, Y. .. Are opened through four heald frames WF, WF. Each heald frame WF is driven via a dedicated drive motor M and a drive mechanism WM such as a crank mechanism.
[0018]
The crank angle θ from the encoder EN connected to the main shaft A of the loom is input to the steady operation means 11 as a pulse train signal. The main shaft A is connected to a main motor (not shown). Further, a stop signal Sa from a loom control circuit (not shown) is input to the steady operation means 11. The steady operation means 11 outputs the target rotation amount Poi (i = 1, 2,... 4) of the drive motors M, M,. The outputs of the drive control units 21 are individually connected to the drive motors M, M,..., And the rotation amount Pf of each drive motor M is fed back to the drive control unit 21.
[0019]
In addition to the crank angle θ from the encoder EN, a restart signal Sb from a loom control circuit (not shown) and the current position Gi (i = 1, 2,... 4) of each heald frame WF are input to the synchronization means 12. Have been. The current position Gi represents, for example, the current height position of each heald frame WF detected by the rotation position of each drive motor M. The synchronization means 12 outputs the adjustment rotation amount Psi (i = 1, 2,... 4) of the drive motors M, M,. Another output of the steady operation means 11 is connected to the synchronization means 12.
[0020]
The up-and-down movement means 13 is configured by attaching setting devices 13b and 13c to the up-and-down movement instruction section 13a (FIG. 2). Note that a restart signal Sb 1 is input to the up-and-down movement instruction unit 13a. The up / down movement instructing unit 13a outputs the amount of rotation Pq for up / down movement to the drive control unit 21 as a pulse train signal, and when the cumulative number of pulses of the amount of rotation Pq reaches the set value Pqm from the setting unit 13b, the amount of rotation Pq Stop output. However, the up-down movement instructing unit 13a determines the pulse frequency of the rotation amount Pq based on the up-down movement speed vq from the setting unit 13c.
[0021]
The structure of the woven fabric Ya with the cycle number n = 1, 2,... 6 as one repeat using four heald frames WF, WF, having the frame numbers m = 1, 2,. The pattern (FIG. 3A) and the opening pattern Ksi (i = 1, 2,..., 4) of each heald frame WF based on the tissue pattern are set and stored (FIG. 3B). The heald frames WF, WF,... Are assigned frame numbers m = 1, 2,... 4 in order from the reed R2 side to the sending side, for example. The tissue pattern indicates that the opening position of the heald frames WF, WF,.
[0022]
Now, when the loom is in the steady operation, the rotation of the main shaft A outputs the crank angle θ from the encoder EN, and the steady operation means 11 outputs the cycle number n in one repeat of the designated tissue pattern based on the crank angle θ. (N = 1, 2,...) Are specified and updated, and the target rotation amount Poi of each drive motor M is tracked according to the crank angle θ so as to realize the opening pattern Ksi = f (n, θ). It can be output to the drive control unit 21. Therefore, the drive control unit 21 controls the rotation of each drive motor M so that the rotation amount Pf of each drive motor M becomes the target rotation amount Poi, and each drive motor M raises or lowers the heald frame WF according to the opening pattern Ksi. The heald frame WF can be opened and moved upward and downward while being lowered and synchronized with the main shaft A.
[0023]
If a weft insertion failure occurs at cycle number n = n1 during the steady operation of the loom, a stop signal Sa is generated in the loom control circuit, the main motor stops, and the loom stops. On the other hand, the stop signal Sa is input to the steady operation means 11, and the steady operation means 11 can store the cycle number n = n1 + 1 when the loom is stopped. This is because, when a weft insertion failure occurs, the loom is generally controlled to stop the next weft insertion and stop in the next cycle. When the loom stops, each drive motor M stops with the stop of the main shaft A while maintaining the synchronous relationship with the main shaft A.
[0024]
When the loom is restarted, the spindle A is reversed to the exit position of the cycle number n = n1 where the weft insertion failure has occurred, while maintaining the functions of the steady operation means 11 and the drive control unit 21. The defective weft is drawn out and removed, the spindle A is further reversed, and set to the restart position of the cycle number n = n1-1. At this time, the steady operation means 11 updates the cycle number n in the reverse direction based on the crank angle θ according to the rotation of the main shaft A from when the loom is stopped until the restart position. Then, when the restart signal Sb is generated in the loom control circuit, the loom moves through the vertical movement of the heald frames WF, WF. (FIG. 4).
[0025]
That is, when the restart signal Sb 1 is generated, the up-down movement instructing section 13a of the up-down movement means 13 outputs the rotation amount Pq for up-down movement of the pulse frequency based on the speed vq from the setter 13c to the drive control section 21 ( Time t ≧ t1 in FIG. 4, hereinafter simply referred to as (t ≧ t1)). Therefore, the drive control unit 21 rotates the drive motors M, M,... At a constant speed corresponding to the speed vq to move the heald frames WF, WF. (T1 ≦ t <t2), and warp yarns Y, Y,... However, the speed vq is set such that the rotation speed of each drive motor M during the vertical movement is 50 to 200% of the rotation speed during the steady operation.
[0026]
When the cumulative number of pulses of the rotation amount Pq reaches the set value Pqm, the vertical movement instructing unit 13a stops the output of the rotation amount Pq, stops the drive motors M, M..., And outputs the heald frames WF, WF. The up-and-down motion ends (t = t2). However, in FIG. 4, only the operation of one heald frame WF is shown.
[0027]
Subsequently, the synchronization unit 12 reads the current cycle number n, that is, the cycle number n = n1 −1 at the restart position, and the opening pattern Ksi from the steady operation unit 11 based on the crank angle θ at the restart position. By finding the opening pattern Ksi = f (n, θ) = f (n1-1, θ), the adjustment of each drive motor M necessary for each heald frame WF at the current position Gi to realize the opening pattern Ksi. The rotation amount Psi is calculated and output to the drive control unit 21 (t ≧ t2a, where t2a−t2 ≒ 0). Therefore, the drive control unit 21 adjusts and drives each drive motor M by the adjustment rotation amount Psi to synchronize the heald frames WF, WF... With the main shaft A (t2a ≦ t <t3), thereby realizing the opening pattern Ksi. Can be. However, in FIG. 4, the heald frame WF is synchronized with the lowered state.
[0028]
In FIG. 4, the speed of the heald frame WF during the synchronizing may be the same as the speed vq during the vertical movement, as long as the heald frame WF can be surely synchronized with the main shaft A. It may be faster or slower. Further, the driving direction of the heald frame WF for synchronizing is not fixed to the same as the driving direction during the vertical movement as shown in FIG. 4, but the adjustment rotation amount Psi for realizing the opening pattern Ksi is smaller. , The time (t3−t2a) required for synchronization can be minimized.
[0029]
Thereafter, the loom is restarted, and each drive motor M follows the main shaft A via the steady operation means 11 (t ≧ t3), so that the heald frames WF, WF... Thus, the loom can be shifted to the steady operation.
[0030]
Note that the synchronization means 12 may synchronize with the main shaft A without stopping the heald frames WF, WF... After the vertical movement of the heald frames WF, WF. Time t2 ≦ t <t3). However, in FIG. 5, only the operation of one heald frame WF is shown, and the heald frame WF is driven in the same direction as the driving direction during the vertical movement at a speed lower than the speed vq during the vertical movement. Is synchronized with the rising state. The synchronizing means 12 at this time also outputs an adjustment rotation amount Psi of each drive motor M necessary to realize the opening pattern Ksi based on the current position Gi at the end of the vertical movement.
[0031]
The heald frames WF, WF,... Stop while maintaining the synchronous relationship with the main shaft A even when the loom stops due to a stop cause other than the weft insertion failure such as a warp break or a manual stop operation. Therefore, when the loom is restarted, the cause of the stop is restored, the main shaft A is set to the restart position, the heald frames WF, WF... Are moved up and down, and all the heald frames WF, WF. The loom may be returned to the normal operation in synchronization with the operation.
[0032]
On the other hand, when the loom stops due to a power failure, the inertia rotation amounts of the main shaft A and the respective drive motors M are not the same, so that the loom stops in a state where the synchronous relationship between the heald frames WF, WF. At this time, it is highly possible that the weft inserted immediately before the occurrence of the power failure has a defective weft insertion. Therefore, at this time, first, each heald frame WF is synchronized with the main shaft A by using the synchronizing means 12, and then the defective weft is spouted out and removed, and the main shaft A is set at the restart position. The heald frames WF, WF,... Are moved up and down by the motion means 13, and the heald frames WF, WF,.
[0033]
In the above description, the vertical movement by the vertical movement means 13 may be performed on at least one or more arbitrary heald frames WF, instead of on all of the plurality of heald frames WF. However, it is sufficient for the synchronization means 12 at this time to synchronize only the heald frame WF that has been moved up and down. Further, the heald frames WF, WF... Can be moved up and down in accordance with individual up and down movement patterns by providing up and down movement means 13 for each drive motor M, for example. For example, the heald frames WF, WF,... Are made to move up and down so as to have the opposite phase every other sheet, or are simply moved up and down every other sheet to make the warp Y, Y. Can be.
[0034]
In addition, instead of storing the opening pattern Ksi for each heald frame WF, the steady operation means 11 forms a unit opening pattern Ksj (j = 1, 2,...) For each cycle and an opening pattern Ksi for one repeat. The combination pattern of the unit opening patterns Ksj to be performed is stored, and the opening pattern Ksi of each heald frame WF can be created by combining the unit opening patterns Ksj. Since the unit opening pattern Ksj = f (θ) can be used in common for each cycle number n of each heald frame WF, the number of heald frames WF, WF... Increases, and the number of cycles constituting one repeat is reduced. Even if it becomes larger, there is no possibility that the required memory capacity becomes extremely large.
[0035]
The up-and-down movement means 13 automatically returns each heald frame WF to its original position in a synchronous relationship with the main shaft A by reciprocatingly driving each heald frame WF to be moved up and down an integer number of times. The synchronization after the vertical movement by the synchronization means 12 can be omitted. In order to move each heald frame WF up and down exactly an integral number of times, a set value Pqm equivalent to an integral multiple of the rotation amount Pf of each drive motor M required to make the heald frame WF reciprocate up and down one time is set. 13b.
[0036]
[Other embodiments]
The vertical motion means 13 may output the pseudo crank angle θa for vertical motion to the steady operation means 11 instead of outputting the rotation amount Pq for vertical motion to the drive control unit 21 (FIG. 6). The pseudo crank angle θa is a pulse train signal having the same form as the crank angle θ from the encoder EN. The vertical motion instructing unit 13a of the vertical motion unit 13 outputs the pseudo crank angle θa of the pulse frequency based on the speed vq to the steady operation unit 11, so that the drive motor M, M ... can be operated, and the heald frames WF, WF ... can be moved up and down in accordance with the opening pattern Ksi during normal operation.
[0037]
The setting unit 13b of the vertical movement means 13 may set a period tq for the vertical movement instead of the set value Pqm for the vertical movement (the same figure). The vertical movement instructing unit 13a outputs the pseudo crank angle θa or the rotation amount Pq over the period tq, and can move each heald frame WF up and down.
[0038]
Further, instead of inputting the current position Gi of each heald frame WF, the synchronization means 12 may input an origin signal Sci (i = 1, 2,... 4) indicating the origin position of each heald frame WF. (The same figure). At this time, the synchronization means 12 sets the adjustment rotation amount Psi of each drive motor M to the amount of movement of each heald frame WF from the origin position required to realize the opening pattern Ksi = f (n, θ). Can be output. That is, the synchronization means 12 starts each drive motor M, and after the origin signal Sci is input, further rotates each drive motor M by an amount corresponding to the adjustment rotation amount Psi to synchronize each heald frame WF with the main shaft A. Thus, the opening pattern Ksi can be realized.
[0039]
The heald frames WF, WF... May be moved up and down by a common drive motor M via a common drive mechanism WM such as a cam mechanism (FIG. 7). The drive mechanism WM is connected to the drive motor M via the clutch CL1 and to the main shaft A via the clutch CL2. However, the drive mechanism WM is provided with an opening control function during steady operation, and therefore the steady operation means 11 is omitted. The clutch CL2 is a so-called one-point clutch that can be connected only at a specific crank angle θ of the main shaft A.
[0040]
When the loom stops, the drive motor M is connected to the drive mechanism WM via the clutch CL1, and the clutch CL2 is disconnected. Therefore, the up-down movement means 13 outputs the rotation amount Pq for up-down movement to the drive control unit 21, and simultaneously drives the heald frames WF, WF... Through the drive motor M and the drive mechanism WM according to the opening pattern Ksi at the time of steady operation. Can be moved up and down. The synchronizing means 12 outputs the adjustment rotation amount Ps to the drive control unit 21 to set the drive mechanism WM at a position where the clutch CL2 can be connected via the drive motor M, and the heald frames WF, WF. Can be synchronized with the main shaft A. Then, the clutch CL2 is connected, the drive mechanism WM is connected to the main shaft A, the clutch CL1 is disconnected, and then the loom is restarted.
[0041]
In the above description, the vertical movement speed vq of the heald frames WF, WF... Set in the setting device 13c is appropriately set according to the warp Y, Y. Further, the vertical movement means 13 may drive the drive motor M at a variable speed instead of driving the drive motor M at a constant speed (FIG. 8). That is, the up-and-down movement means 13 changes the rotation amount Pq for the up-and-down movement or the pulse frequency of the pseudo crank angle θa in time series, and changes the speed v of each drive motor M during the up-and-down movement of the heald frames WF, WF. The gear can be shifted stepwise (FIG. (A)) or continuously (FIG. (B)).
[0042]
【The invention's effect】
As described above, according to the present invention, when the loom is restarted, the heald frame is moved up and down without rotating the main shaft, so that warp warp necessary and sufficient can be generated. It is possible to minimize the possibility that the continuity of the weft density is disturbed in the vicinity of the cloth fell immediately after the start-up, and effectively prevent the occurrence of the weaving step at the time of restart due to the continuity of the weft density being disturbed. Has an excellent effect.
[Brief description of the drawings]
FIG. 1 is a block diagram of an overall configuration. FIG. 2 is a block diagram of a main part. FIG. 3 is an explanatory diagram of an organization pattern. FIG.
FIG. 5 is an operation explanatory diagram (2).
FIG. 6 is a block diagram showing a main part of another embodiment. FIG. 7 is a block diagram showing another embodiment. FIG. 8 is an operation explanatory diagram showing another embodiment.
A: Main shaft WF: Heald frame θ: Crank angle Ksi: Opening pattern

Claims (5)

When the loom is restarted, at least one heald frame is continuously moved up and down without rotating the spindle, provided that the spindle is set to the restart position, and all the heald frames are synchronized with the spindle. A restart control method for a loom, characterized in that the loom is restarted on condition that there is a certain condition. 2. The restart control method for a loom according to claim 1, wherein the heald frame is moved up and down according to a dedicated up and down movement pattern. 2. The restart control method for a loom according to claim 1, wherein the heald frame is moved up and down according to an opening pattern during a steady operation. 4. The restart control method for a loom according to claim 1, wherein the heald frame is moved up and down and then synchronized with the main shaft. 4. The restart control method for a loom according to claim 1, wherein the heald frame is moved up and down an integral number of times.

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