JP3578279B2 - Operation control method of warp break detecting device of loom - Google Patents

Description

[0001]
[Industrial applications]
The present invention is to restart the loom while overlooking the warp break when the loom stops at the weft stop, to effectively prevent the repair work from becoming difficult or the operating rate of the loom from being unduly reduced. And an operation control method of the warp breakage detecting device of the loom.
[0002]
[Prior art]
If a weft insertion failure occurs during operation, the loom is stopped immediately, and automatically returns to normal operation after a series of operations such as automatic reversing, weft repair, re-reversing, and restarting (Fig. 9). Here, the first automatic reversal is for discharging the defective weft, and the second re-reversal is for setting the loom to a predetermined starting angle. However, the subsequent re-inversion may be due to forward rotation.
[0003]
On the other hand, at this time, the dropper device for detecting the breakage of the warp shifts from the operating state to the inactive state at the same time as the start of the stop operation of the loom after the occurrence of the weft insertion failure, and returns to the operating state at the same time as the restart of the loom. It is normal (the same figure). If the dropper device is operated while the loom is stopped, the operator may be electrocuted during the weft repair, which is disliked. In addition, from such a historical background, it is common to control the dropper device similarly even in a loom in which weft repair is fully automated.
[0004]
[Problems to be solved by the invention]
In the case of this conventional technique, when the weft is stopped due to a warp break and the loom is stopped, when the loom is restarted, the occurrence of the warp break is overlooked, and the loom is restarted while leaving the warp break. In order to start the machine, there is a problem that a large number of warps are cut to increase the accident, or that the weft insertion failure due to the warp breakage recurs and the loom becomes inoperable. That is, the dropper device uses a dropper supported by each warp, and detects that the dropper has dropped due to the breakage of the warp and detects the breakage of the warp. When the warp is entangled with the warp and the dropper becomes difficult to drop, or when the warp is cut away from the dropper, the dropper may take too long to drop. This is because, even if the weft is hooked on the cut warp to cause a weft insertion defect and the loom stops, it may not be possible to detect the warp break that caused the weft.
[0005]
Accordingly, an object of the present invention is to reliably detect the occurrence of warp breakage by operating the dropper device for a predetermined period after the start of the stopping operation of the loom due to the occurrence of a weft insertion defect in view of the problem of the related art. It is an object of the present invention to provide a method for controlling the operation of a warp breakage detecting device of a loom which can be performed.
[0006]
[Means for Solving the Problems]
The configuration of the present invention for achieving this object, in response to the occurrence of poor weft insertion, when stopping and restarting the loom, during the period from the start of the stop operation of the loom due to poor weft insertion to restart, The gist of the present invention is to make the dropper device operative for a predetermined period that includes at least a part of the operation period of the loom and is shorter than the period from the start to the restart of the stop operation of the loom. However, the operation period of the loom refers to any one of a period during which the loom is stopped, during reverse rotation, and during normal rotation.
[0007]
In addition, the predetermined period can be set as a start point of the start time of the loom stop operation, or can be set as a start point after a fixed period from the start time of the stop operation of the loom.
[0008]
Further, the predetermined period may be set in relation to a specific operation of the loom after the loom is stopped due to poor weft insertion.
[0009]
[Action]
According to the configuration of the invention, even if a weft insertion failure occurs and the loom is stopped, the dropper device is in an operating state for a predetermined period after the start of the loom stop operation. Can be detected and displayed without fail even if is caused by warp breakage. The predetermined period at this time may be determined in consideration of, for example, the maximum time required for the dropper to fall after the warp is cut. In addition, the predetermined period may be set so that the operation state of the dropper device is continued until, for example, during or after the stop operation of the loom due to poor weft insertion. This is because even if the dropper is hung in the middle of the fall, it is considered that the dropper will surely fall due to vibration or the like in the middle of the stop operation of the loom. Further, the predetermined period may be set so as to continue during or after the automatic reversal after the loom is stopped. Similarly, the dropper may fall due to vibration during reverse rotation or the like.
[0010]
In general, the predetermined period may be set as the starting point of the stop operation of the loom due to the occurrence of the weft insertion failure, and the dropper device at this time starts from the normal operation before the occurrence of the weft insertion failure. After the occurrence, the operating state of the loom is extended even during the stop operation. However, the predetermined period can be set as a starting point after a certain period from the start of the stop operation of the loom.
[0011]
Further, after the loom is stopped, a predetermined period can be set in relation to a specific operation of the loom, for example, a reverse rotation operation, a normal rotation operation, or the like. This is because it is conceivable that the dropper falls due to vibration or the like caused by these specific operations. However, the predetermined period in this case may be set to coincide with the period of the reverse rotation operation and the normal rotation operation of the loom.
[0012]
【Example】
Hereinafter, embodiments will be described with reference to the drawings.
[0013]
The operation control method of the warp break detecting device of the loom is performed by the control circuit 10 which receives the loom operation signal S1 from the loom control circuit C and operates the relay R (FIG. 1).
[0014]
The loom control circuit C arbitrarily controls the start and stop of the loom via a start / stop switch (not shown), and receives a weft insertion failure signal Sf from a weft feeler (not shown) and a warp break signal Sd from the dropper device D. Thus, the loom can be automatically stopped.
[0015]
The dropper device D has a large number of droppers D2, D2,... Engaged with a main body D1 composed of electrodes D1a, D1b (FIGS. 2, 3). Here, only one of the droppers D2, D2... Is shown. One electrode D1a is formed in an upward groove shape, and the other electrode D1b is housed in the electrode D1a via an insulating plate D1c.
[0016]
The dropper D2 is an extremely thin metal plate having an opening D2a for inserting the main body D1 at an upper portion thereof and having a downward concave portion D2b, and the warp W is engaged with the concave portion D2b. That is, when the warp W is normal, the dropper D2 is pushed upward by the warp W and does not come into contact with the electrode D1b. However, when the warp W is cut, the dropper D2 falls by its own weight and the upper side of the opening D2a. The electrodes D1b and D1a can be electrically connected via D2c.
[0017]
The electrode D1a is connected to one input terminal of the voltage detection circuit D3, and the electrode D1b is connected to the normally open contact Ra of the relay R, the high resistance Rd for limiting the current, and the DC power supply Ed. It is connected to the other input terminal. An output relay R1 is connected to the output of the voltage detection circuit D3. A normally open contact R1a of the relay R1 is a warp break signal Sd for the loom control circuit C. Then, when the relay R is operating and the electrodes D1a and D1b are electrically connected via the dropper D2 while the relay R is operating, the DC power supply Ed is connected between its input terminals and the relay R1 is connected. By driving, the warp break signal Sd can be output. Further, when the relay R is not operating, the voltage detection circuit D3 does not output the warp break signal Sd regardless of the state of the dropper D2. That is, the relay R can set the dropper device D to an operation state or a non-operation state depending on whether or not to operate the relay R.
[0018]
The loom operation signal S1 from the loom control circuit C is input to the OR gate 11 in the control circuit 10 (FIG. 1), and the output of the OR gate 11 is connected to the relay R. The loom operation signal S1 is branched and input to the timer 12, and the output of the timer 12 is also input to the OR gate 11. The timer 12 is provided with a setting device 12a.
[0019]
Now, when the loom is operating normally, the loom control circuit C continuously outputs the loom operation signal S1, and the weft insertion failure signal Sf from the weft feeler is input (at time t = When the loom is automatically stopped, the loom operation signal S1 is extinguished simultaneously with the start of the loom stop operation (t = t2). In FIG. 4, the horizontal axis represents time t, and the vertical axis represents the operating speed v of the loom. Generally, the time T1 = t2-t1 from the occurrence of the weft insertion failure signal Sf to the start of the stop operation of the loom is a waiting time for stopping the loom at a fixed position, and the main shaft of the loom that has been operating normally. Is a very short time of only a fraction of a revolution, so it can be considered substantially that T1 ≒ 0. After that, the loom is completely stopped (t = t3), automatically reverses and feeds out the defective weft (t = t4 to t5), and after the weft repair (t = t5 to t6), the loom reaches a predetermined starting angle. It reverses again (t = t6 to t7), is restarted (t = t8), and returns to normal operation (t = t9).
[0020]
On the other hand, when the loom operation signal S1 is present, the control circuit 10 can operate the relay R via the OR gate 11 to keep the dropper device D in operation (t <t2, t ≧ t8). If the timer 12 of the control circuit 10 is started at the falling of the loom operation signal S1 and its output is set to a low level after a set time Ts <t8-t2 set in the setter 12a, the timer 12 can delay the return of the relay R by a time equal to the set time Ts after the start of the stop operation of the loom, and can maintain the dropper device D in the operating state. This is because the relay R can operate through the timer 12 and the OR gate 11 for the set time Ts even if the loom operation signal S1 disappears.
[0021]
Therefore, even when the loom stops in response to the weft insertion failure signal Sf, the dropper device D starts the loom stop operation within the set time Ts, that is, starts the loom stop operation. During a predetermined period shorter than the time T2 = t8-t2 from the start to the restart, it is possible to maintain the operating state and reliably detect the warp breakage that caused the weft insertion failure. When the dropper device D detects a warp breakage in this way, the fact is displayed by a display lamp or the like (not shown) and the subsequent restart of the loom is prohibited.
[0022]
In the above description, the minimum value of the set time Ts should be set in consideration of the maximum time required for the dropper D2 to fall. However, the set time Ts is set to Ts ≦ t3−t2 to include at least a part of the period during which the loom is stopped, so that the dropper device D is maintained in the operating state until the loom is stopped or until it is completed. May be. If the dropper D2 drops during the stop operation of the loom, the dropper device D can detect the dropper D2 and detect a warp break. Further, the set time Ts may be set to t4−t2 <Ts ≦ t5−t2 to include at least a part of the period during which the loom is rotating in the reverse direction. At this time, the dropper device D operates during the stop operation of the loom. In addition, even during the automatic reversal, the drop of the dropper D2 can detect the breakage of the warp.
[0023]
[Other embodiments]
The control circuit 10 can be formed by a combination of the OR gate 11 and the flip-flop 13 (FIG. 5). The loom operation signal S1 and the automatic reversing signal S2 from the loom control circuit C are input to the set terminal S and the reset terminal R of the flip-flop 13, respectively, and the output terminal Q of the flip-flop 13 is connected to the OR gate 11. Have been.
[0024]
Assuming that the automatic reversing signal S2 is output from the loom control circuit C when the loom is automatically reversing (time t = t4 to t5 in FIG. 4), the flip-flop 13 starts the loom and simultaneously operates the loom. It is set by the signal S1 and is automatically reset by the automatic reversal signal S2 when the loom is automatically stopped after the loom is automatically stopped and the defective weft is picked up (time t = t4 in FIG. 4). That is, the dropper device D at this time can extend the operation state through the flip-flop 13, the OR gate 11, and the relay R until the start of the automatic reverse rotation after the start of the stop operation of the loom.
[0025]
The control circuit 10 may be formed only by the OR gate 11 that inputs the loom operation signal S1, the reverse rotation signal S2a, and the normal rotation signal S3a from the loom control circuit C (FIG. 6). However, the reverse rotation signal S2a and the normal rotation signal S3a are output from the loom control circuit C when the loom is automatically or manually reversed after the loom is stopped and rotated forward. After the loom stops, the dropper device D can be set to an operation state in which the operation period is set as a predetermined period in relation to specific operations of these looms.
[0026]
The control circuit 10 may be a combination of the OR gate 11 and the one-shot pulse generator 14 driven by the operation signal S4a from the loom control circuit C (FIG. 7). Assuming that the operation signal S4a is a signal obtained by assembling the reverse rotation signal S2a and the normal rotation signal S3a of the previous embodiment, the dropper device D at this time requires a one-shot pulse generator related to a specific operation of the loom. The operation state can be set only for a predetermined period equal to the set time of fourteen, that is, for a predetermined period including at least a part of the period during the reverse rotation and the normal rotation of the loom.
[0027]
Further, the control circuit 10 may interpose a one-shot pulse generator 14 between the timer 12 and the OR gate 11 in FIG. 1 (FIG. 8). The timer 12 measures the elapsed time after the start of the stop operation of the loom, and drives the one-shot pulse generator 14 after the set time Ts. Therefore, the dropper device D at this time operates for a certain period from the start of the stop operation of the loom. Starting from the later point, the operating state can be set for a predetermined period equal to the set time of the one-shot pulse generator 14.
[0028]
【The invention's effect】
As described above, according to the present invention, the dropper device is operated only for a predetermined period of time after the start of the stop operation of the loom due to the occurrence of a weft insertion defect. When a defect occurs, even if the dropper is caught or the dropper takes time to drop, it is possible to reliably detect the occurrence of warp breakage. It is possible to effectively eliminate restarting, thereby increasing the accident and unduly lowering the operating rate of the loom, and by providing a period during which the dropper device is not in operation, to repair the weft. There is an excellent effect that the operator does not have a risk of electric shock. Further, by setting the predetermined period so as to include at least a part of the operation period of the loom, the dropper easily falls due to vibrations during the stop operation of the loom, during the reverse rotation, or during the normal rotation, and the warp breakage is more reliably performed. There is also an effect that it can be detected.
[Brief description of the drawings]
FIG. 1 is an overall block system diagram. FIG. 2 is a system diagram of a dropper device. FIG. 3 is a perspective explanatory diagram of a dropper body. FIG. 4 is an operation explanatory diagram. FIG. 5 is a diagram corresponding to FIG. 1)
FIG. 6 is a diagram (2) corresponding to FIG. 1 showing another embodiment.
FIG. 7 is a view (3) corresponding to FIG. 1, showing another embodiment.
FIG. 8 is a view (4) corresponding to FIG. 1 showing another embodiment.
FIG. 9 is a diagram corresponding to FIG. 4 showing a conventional technique.
S1 loom operation signal D dropper device C loom control circuit 10 control circuit

Claims (4)

When the loom is stopped and restarted due to the occurrence of the weft insertion failure, at least a part of the operation period of the loom is included from the start of the loom stop operation due to the occurrence of the weft insertion failure to the restart, An operation control method for a warp breakage detecting device of a loom, characterized in that a dropper device is set in an operation state for a predetermined period shorter than a period from a start of a stop operation to a restart. 2. The operation control method for a warp breakage detecting device for a loom according to claim 1, wherein the predetermined period is set with a start point of a stop operation of the loom as a starting point. The method according to claim 1, wherein the predetermined period is set as a start point after a predetermined period from a start point of the stop operation of the loom. The method according to claim 1, wherein the predetermined period is set in relation to a specific operation of the loom after the loom is stopped due to a poor weft insertion.

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