JP2596782B2 - How to start the loom - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for starting a loom, which is effective in preventing a stop step.

2. Description of the Related Art There are the following two causes of the occurrence of a weaving step, that is, a stopping step due to interruption of a loom.

Change in beating point due to lack of lashing force at start-up Movement before weaving due to decrease in tension based on warp elongation while the loom is stopped The following invention is a solution to the cause of the occurrence of these two stop steps.

(1) Japanese Patent Application Laid-Open No. Sho 59-21751 The above-mentioned invention aims at preventing the cause of the occurrence of the stop step, and performs idle driving at the time of starting, and does not drive the weft insertion, feeding and winding motions for two picks. The main point is. According to this technique, the phase matching with the tissue is unresolved, and the cause of the occurrence of the stop is not considered.
Therefore, the weft insertion cannot be started immediately due to the phase adjustment, and the weaving step may be caused by the continuous unnecessary punching.

(2) Japanese Patent Application Laid-Open No. 61-124651 The invention described above is characterized in that the driving motor of the loom is reversely rotated at the time of start, then slow-started, and when the forward rotation is performed by the same amount as the reverse rotation, the weft insertion, feeding and winding are performed. The main point is to start a picking exercise. The present invention aims at solving the cause of the occurrence of the stop step.
The cause of the stop is not considered. In particular, it is very difficult to match the amount of reverse rotation when the loom is stopped and the amount of normal rotation when the loom is operating, because the frictional state between the warp yarn, the reed, the mail and the like is different each time. For this reason, in the implementation stage, a mismatch between the reverse rotation amount and the normal rotation amount occurs, and this poses a practical problem.

(3) Japanese Patent Application Laid-Open No. 61-296146 The gist of the invention described above is that when the loom is started, the warp yarn tension is returned to the tension value during the continuous operation, and then the driving motor is started. That is, this technique aims at solving the cause of the occurrence of the stop, and does not consider the cause of the occurrence of the stop.

As described above, the related art does not consider the cause and the occurrence of the stop step at the same time, so that the occurrence of the stop step cannot be effectively prevented by any of them.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to simultaneously solve the cause of the occurrence of the stop step and reliably prevent the stop step.

Means for Solving the Problems Under the above-mentioned object, the present invention starts the driving motor at a predetermined angle without reversing the rotation, while continuing the idling, winding and opening movements, and continues the idling. During this idle driving period, the warp tension matches the value during continuous operation, and the wefting force is inserted at a predetermined angle in the cycle after the steadying state is reached, and the winding and shedding motions are started. ing.

By doing so, the cause of the occurrence of the stop stage can be solved at the same time, and the phase adjustment becomes unnecessary.

Incidentally, even if the invention of (1) and the invention of (2) of the prior art are simply combined, the tension matched at the initial stage of the start during the idling period changes, and as a result, the stop stage The cause cannot be solved. The present invention is not a simple combination as described above, in addition to the idling motion, at the same time, by devising the tension control to proceed in parallel, the cause of the occurrence of the stop step, at once to solve. I have.

1 and 2 show the main part of a loom 1 for implementing the method of the present invention.

The warp yarn 2 is sent out from the sending beam 3 via the tension roll 4 and forms an opening 6 with the vertical movement of the heald 5, and in this opening 6, it intersects with the weft yarn 7 inserted by the weft insertion device 56 and reeds. The fabric 8 is beaten to the weave 9 by the fabric 8 to form the woven fabric 10. The woven fabric 10 is wound up by a plurality of guide rolls 11 and a take-up roll 12, and finally wound around a cloth winding beam 13.

The loom 1 includes an electric feeding device 14, an electric shedding device 15, and an electric winding device 16,
Electrically controllable measuring and storage device 53 and weft insertion device 56
And a main nozzle 44 and a sub nozzle 45, which are controlled by the control device 20 together with the driving motor 18 of the main shaft 17.

The external connection state of the control device 20 is shown in FIG. 1, and the internal configuration thereof is shown in FIG.

That is, the driving motor 18 is controlled by the control circuit 21 for program control and the inverter 22 for speed adjustment, in addition to the acceleration (slow start) control at the time of starting and stopping, so as to be at a constant speed during operation. The rotation is transmitted to the main shaft 17 by the belt 23. The actual rotation state (the number of rotations and the rotation angle) of the main shaft 17 is detected by the encoder 24, and is sent to the control circuit 21 and the like as a timing signal via the timing generation circuit 25.

The delivery motor 26 of the delivery device 14 is driven in the forward or reverse direction by a delivery control circuit 27 and a motor drive circuit 28 of a tension control system, and the load cell 29 at the position of the tension roll 4 applies the actual tension of the warp yarn 2. Detect and follow target tension. This control system is
The tacho generator 30 also performs speed feedback control. The rotation of the delivery motor 26 is controlled by a gear train.
By 40, it is transmitted to the delivery beam 3. The feed control circuit 27 is also connected to a tension storage circuit 31 for storing an actual tension value during operation.

Further, the opening device 15 includes an opening motor 32 for driving, for example, two cam mechanisms 33, and based on the opening pattern set by the opening pattern setting circuit 36, the opening control circuit 34 and the motor The drive circuit 35 drives each of them in synchronization with the rotation of the main shaft 17.

The winding motor 37 of the winding device 16 is controlled by a winding control circuit 38 and a motor drive circuit 39 so as to follow the rotation of the main shaft 17 in synchronization with the rotation of the main shaft 17. Transfer to Roll 12. The actual rotation amount of the winding motor 37 is determined by the pulse generator 42.
And is fed back to the winding control circuit 38.

Further, the weft insertion control circuit 43 controls the electromagnetic valves 46 and 47 for controlling the fluid ejection of the main nozzle 44 and the sub nozzle 45.
Is controlled in synchronization with the rotation angle of the main shaft 17. The length measuring and storing control circuit 48 controls the amount of rotation of the feed motor 50 of the length measuring and storing device 53 by following the amount of rotation of the main shaft 17 so that the rotating arm 54
In addition to controlling the rotational movement of the weft thread 7, the amount of weft yarn 7 stored is regulated, and the advance / retreat movement of the locking pin 49 is controlled at a predetermined weft insertion timing.

Then, based on the stop button 51, the operation button 52, and other commands on the operation panel 19, the control circuit 21 controls these parts together with the signal group in FIG. Are sequentially controlled based on the above sequence.

FIG. 4 shows an operating state according to the method of the present invention.

During operation of the loom 1, the driving motor 18 is rotating at a steady speed. During this operation period, the steady rotation signal, the feed drive signal, the tension matching signal, the winding drive signal, and the opening drive signal are all set to “H” level. Note that the stop angle signal is shown to facilitate understanding, and indicates the angle of the stop position of the loom 1. And
Although a pulse-shaped stop angle signal is output during the operation period, this signal is not used for an actual control operation. During such an operation, the warp tension signal changes while pulsating under the influence of the shedding motion. Therefore, during this time, the tension storage circuit 31 stores the tension signal from the load cell 29 by sampling for each predetermined rotation angle, and further obtains the tension between the sampling rotation angles by interpolation, if necessary, or The starting angle is determined in advance, and only the tension at this starting angle in one rotation angle is stored, or an average value is taken for each sampling rotation angle of each opening pattern every several reassembly of the opening pattern. And memorize the average value.

When a stop command is given to the control circuit 21 by the stop button 51 during such an operation period, the inverter 22 decelerates the rotation of the driving motor 18 and stops at a predetermined angle. During this time, the steady rotation signal, the feed drive signal, the tension match signal, and the take-up opening drive signal fall from the “H” level to the “L” level at a predetermined timing. In FIG. 4, the angle at which the driving motor 18 is completely stopped is expressed as a continuous "H" level of the stop angle signal. In this way, when the loom 1 is in the stop period, the warp 2
Tend to gradually decrease due to its elongation.

After such a stop period, when a start command is given to the control circuit 21 by the operation button 52, the inverter 22
In response to the slow start signal, the driving motor 18 is started at a predetermined starting angle, and the main shaft 17 is gradually started up from low-speed rotation to high-speed rotation, and finally increased to a steady speed. Of course, the driving motor 18 is immediately driven in the so-called slow start state in the forward rotation direction without being reversed at the time of startup.

In the present embodiment, for convenience, the starting angle has been described as being the same as the angle at which the loom stopped earlier, but it is needless to say that the starting angle may be different.
Usually, after necessary work such as repair of a defective weft, the loom is reversed to a predetermined starting angle, and restarting is performed from this starting angle. At the same time as the driving motor 18 starts,
Since the feed-out drive signal rises from the "L" level to the "H" level, the feed-out device 14 starts tension control for the warp yarn 2 by setting the tension value at the current start angle as the target tension among the tension signals stored during operation. Then, normally, in response to the decrease in the tension during the stop, the delivery motor 26 is rotated in the reverse direction. During this time, since the shedding device 15 remains stopped, the tension of the warp yarn 2 rises almost linearly without being affected by the shedding motion, and approaches the target tension corresponding to the starting angle. During this slow start, the winding control circuit 3
8. The opening control circuit 34 and the weft insertion control circuit 43 are in a stopped state. Therefore, the opening device 15, the winding device 16, and the weft insertion device 56 are not operating. For this reason, the reed 8 continues so-called idle driving. When the tension of the warp yarn 2 matches the target tension value stored during the continuous operation during the idle driving period, the feed control circuit 27 sends a tension match signal to the control circuit 21. Thereafter, when the repelling force of the reed 8 reaches a steady state, the control circuit 21 confirms the state from the steady rotation signal and generates a start signal, so that the start angle during one rotation at that time is generated. The horizontal insertion device 56, the opening device 15, and the winding device 16 start operating. In this manner, when all the necessary movements are started, the tension of the warp yarn 2 changes while pulsating during one rotation under the influence of the shedding movement as in the steady-state operation. .

In the tension control process at the time of rising, when the influence of friction of the reed 8 or the mail cannot be ignored, if necessary, the tension of the warp yarn 2 is once increased higher than the target tension value, and then reduced. The direction may be changed to match the target tension. Also, in such a control process,
A control target in which the start characteristic of each control target has a problem may be set to the start state at a timing earlier than the steady state only at the start. Further, when the elongation of the warp yarn 2 during the stop becomes a problem, the warp yarn 2 is stopped during the stop period.
Are set to the open state. Thereafter, the cause of the stop is repaired if necessary, and at the time of start-up, the loom is rotated to the start-up angle, and thereafter, under the control of the tension control in a slow start state.

In the above embodiment, both the opening and the winding device are controlled by a dedicated motor, but the present invention is not limited to this. For example, the driving force of the driving motor is interposed by a clutch. Alternatively, a device that transmits power to each device can be used. At this time,
The start / stop of each device is controlled by turning on / off the clutch.

In addition, although the slow start is performed when the loom is started, depending on the case, the slow start may be performed at a normal rotation speed. That is, when it takes a long time for the warp yarn tension to match the target tension at the time of starting the loom, the slow start may be performed in accordance with this, but when this time is short, it may be started at a normal rotation speed. Good.

Effects of the Invention The present invention has the following effects.

The two causes of stoppage of the stop stage, namely, shortage of the slapping force at the time of starting, and movement before weaving due to elongation of the warp during stopping can be eliminated at the same time.

Even if the warp yarn is stretched during the stop period and its tension is reduced and the weaving is moved, the necessary movement for weaving is started when returning to the target tension during operation when restarting. In particular, the occurrence of a stop stage can be reliably prevented.

[Brief description of the drawings]

1 is a schematic side view of a loom, FIG. 2 is a plan view of a weft insertion part, FIG. 3 is a block diagram of a control device, and FIG. 4 is a time chart according to a starting method of the present invention. 1 ... loom, 2 ... warp yarn, 3 ... delivery beam, 6
...... Opening, 7 ... Weft, 8 ... Reed, 9 ... Weaving, 10
…… Woven cloth, 14 …… Sending device, 15 …… Opening device, 16…
… Rewinding device, 17… Spindle, 18… Drive motor, 20…
Control device, 53 ... Length measuring and storage device, 56 ... Weft insertion device.

Claims (1)

(57) [Claims] When the loom is started, the driving motor is started at the starting angle to continue the idling motion and the feed-out motion of the tension control system is continued while the weft insertion motion, the winding motion and the shedding motion are stopped. Thereby, during the idle driving period, the warp yarn tension matches the value at the time of steady rotation, and the wefting, winding and opening movements are performed at the starting angle of the cycle after the staple driving force reaches the steady value. A method for starting a loom, characterized by starting the loom.