JPS6155241A - Prevention of pick matching step in loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a feeding/winding device for a loom, and more particularly to a control method that is effective in preventing weaving steps during restart.

In conventional high-speed looms, the rotational speed does not reach the steady rotational speed at the initial stage of startup, so the inertial force of the beating system such as sley and reed is insufficient, which tends to cause weaving steps, or interstitial membranes, in the woven fabric. . Such weaving steps can be eliminated to some extent by forcibly retracting the weave or by increasing the torque of the drive motor.

However, according to the former method, that is, the means of retracting the weaving opening, even if you try to pull back the equivalent of one pick during weaving,
Due to the elongation of the warp threads during stoppage or the strong frictional force of the presto beam or temple, the return amount cannot be set accurately, and a drive mechanism with a large torque is required, which is practically difficult. Further, even with the latter means, that is, the means of increasing the torque at the time of starting the drive motor, it is not possible to obtain a rising characteristic suitable for preventing weaving steps at high speed rotation. As described above, all solutions are insufficient in preventing the occurrence of weaving steps.

On the other hand, another method for preventing the stop stage is described in Japanese Patent Laid-Open No. 59-21751. The method to prevent the stop stage is as follows:
The reeling is started immediately when the loom is started, but the feeding and winding operations are set to start after at least two reelings. However, according to this method, the weft-inserting device is in a stopped state regardless of the rotation of the main shaft of the loom, so the synchronization between the weft-inserting device and the rotation of the loom is broken, and in multicolor looms, etc., continuous Weaving becomes impossible. Furthermore, in order to maintain this synchronization, it is necessary to beat the number of times required for one repetition of the fabric structure. In particular, if reverse operation is performed while the loom is stopped, the woven fabric will loosen in the section between the take-up beam and the temple, but winding will not take place at the beginning of startup, and the subsequent Even in the early stages of the process, the woven fabric remains virtually unrolled until the woven fabric is no longer loose.
The weave will tend to recede and a thick film will develop during this period.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide an effective method for preventing the occurrence of weaving steps such as a thin film or a thick film when a loom is restarted after being reversed.

Solution to the Invention As already described, even if the P& loom is reversed during the period when the loom is stopped, the woven fabric will only sag due to the frictional force between the woven fabric and the temples, presto beams, etc. is not moving. However, while repeating experiments, the inventor discovered that when the loom is subsequently started up and an external force is applied to the warp yarns and the woven fabric due to shedding motion, this causes the weaving head to retreat. In other words, when the loom is restarted, when an external force is applied due to shedding motion, etc., the balance of the static frictional force acting between the warp and woven fabric and the temple, presto beam, or various rolls is disrupted, and the loosened part of the woven fabric is pulled back by the tension of the warp. As a result, Origuchi retreats. Therefore, if this state is maintained for a while at the beginning of the rotation of the loom, the lack of beating force can be compensated for by the receding of the cloth opening.

The method for preventing the mating rows of the present invention is based on the above-mentioned fact, and in order to keep the sheath set back for a predetermined delay time after the start of the loom, the warp yarn delivery is started after a predetermined delay time. That's what I do. On the other hand, the winding motion is
It starts immediately after starting the loom. If this winding movement is delayed, the absorption of slack in the fabric due to reversal will be delayed, resulting in a thick film.

Also, when driving the weft thread, the weft thread is usually
It is rare for the reed to be driven to the correct position in one stroke; it moves little by little due to the pressing force of the weft that is subsequently driven in, and reaches a stable position after two or three strokes. . Such a phenomenon is particularly likely to occur in the case of spun fabrics. Therefore, if unwinding is started after a predetermined delay time after the start of the loom as described above, the yarn tension will be higher than normal due to winding after startup, and the movement of the weave due to winding will be caused near the front of the weaving. It will be suppressed until it balances the fabric tension. For this reason, the amount of movement of the newly driven weft yarn becomes larger than in the normal case, and the occurrence of slender membranes is further reduced.

Structure of the sending-off/winding device First, Fig. 1 shows the sending-off/winding device of the loom, which is the premise of the present invention.
The winding device l is shown. This feeding/winding device 1 receives rotational force from the main shaft 2 of the loom. That is, the main shaft 2 is driven by the drive motor 3 and rotates in synchronization with the movement of the loom, and the rotation is transmitted to the input shaft 7 of the transmission 6 via the pulley 4 and the heald 5. This transmission 6 converts the rotation of an input shaft 7 into a reciprocating rocking motion based on the principle of a lever crank mechanism, and converts the rocking motion into a rotation in only one direction using an internal one-way clutch. to communicate. The speed ratio (reduction ratio) of this transmission 6 is determined by the rotation angle of the speed change lever 9.
It is now possible to do so.

The rotation of the output shaft 8 of the transmission 6 is transmitted to the gear shaft 12 via a change gear 10.11 at a predetermined gear ratio. This gear shaft 12 meshes with a corresponding gear shaft 13 by a bevel gear 14.15, converting the direction of rotation thereof into a right angle direction. This gear shaft 13 is connected to a worm shaft 18 on the input side of a worm reducer 17 with an electromagnetic clutch 16 interposed therebetween, for example. This worm shaft 18 fixes the worm 19 and is connected at one end to an unwinding handle 20. The worm 19 is connected to a worm wheel 21 on the output side.
The shaft 22 of this worm wheel 21 is engaged with a beam gear 25 attached to a delivery beam 24 via a pinion gear 23. The sending beam 24 holds a large number of warp yarns 26 in a wound state, and these warp yarns 26 pass through a tension roll 27, intersect with the weft yarns 33 in the weave 28 of the opening, and are twisted in the reed 54. The woven fabric 34 is passed through the temple 41, the presto beam 29, the take-up roll 30, and the guide roll 31, and is sequentially wound around the outer periphery of the take-up beam 32 (this take-up roll 30
, the reed 54 and the main shaft 2 are both driven by the driving morph 3.

The tension roll 27 is connected to a tension lever 3 which is swingably supported by a fulcrum shaft 35 at a fixed position.
The tension lever 36 and the other part fm91E are connected to a lever 38 by a tension spring 37. This lever 38 is swingably supported by a fulcrum shaft 39 at one end, holds a weight 40 at the other end iJ, applies a clockwise rotational moment to the tension lever 36, and applies a constant tension to the warp threads 26. It's hanging. This lever 38 is mechanically connected to the speed change lever 9 as shown by the dotted line.

Next, FIG. 2 shows the control circuit 5o. In this circuit, the relay 4 is connected to the power supply terminal 51 via the operation switch 43.
4.45 and timer relay 46 are connected in parallel. Further, a normally closed stop switch 47 and a relay contact 48 connected in series are connected in parallel to the above operation switch 43. The relay 44 drives a contact 49 interposed in the power supply circuit of the driving morph 3,
In addition, the relay 45 and the timer relay 46 drive the contact 52 and the delay contact 53, which are interposed in series in the power supply circuit of the excitation coil 42 of the Kuranochi 16, respectively.
Contact 48 is also driven. In this FIG. 2, things connected by dotted lines indicate interlocking relationships.

Effect of the method for preventing the mating step Next, the effect of the present invention will be explained together with the operation of the feeding/winding device 1.

When the loom is stopped, the electromagnetic clutch 16 is in a de-energized state (off), as shown in FIG. 3, so that the gear shaft 13 and the worm shaft 18 are separated. In this state, when the operation signal S1 is input from the control device,
Since the run switch 43 is closed, the relay 44.45 closes the corresponding contact 48.49.52, immediately starting the prime mover morph 3 and forming a self-holding circuit. At this time, as shown in FIG. 3, the rotation speed V of the driving motor 3 rises in proportion to the elapsed time, and reaches the cosmic rotation speed after a predetermined time. In this way, the initial operation of the loom is started.

On the other hand, the timer relay 46 turns on the delay contact 53 after a predetermined delay time Tl has elapsed since the operation switch 43 is turned on, and turns on the excitation coil 42 of the electromagnetic clutch 16. At this time, the clutch 16 mechanically connects the gear shaft 13 and the worm shaft 18. In this way, delivery begins substantially after this delay time.

The rotation of the drive motor 3 is transmitted from the main shaft 2 to the input shaft 7 via a pulley 4 and a belt 5. Here, the transmission 6 drives the output shaft 8 based on the speed change ratio given by the speed change lever 9, and transmits it to the gear shaft 13 via the change gear 10.11 and the bevel gear 14.15. The rotation of this gear shaft 13 is transmitted to the worm shaft 18 through engagement of the clutch 16, so the worm shaft 19 drives the worm wheel 21 at a predetermined reduction ratio, and the pinion gear 23 and beam gear 25 drive the worm wheel 21 to send out the beam. 24 is rotated at a predetermined feed speed.

In this way, the feed beam 24 sequentially feeds out the warp threads 26 as weaving progresses.

On the other hand, the winding roll 30 rotates at a constant speed and winds up the woven fabric 34 one after another.

During this time, when the tension of the warp yarns 26 changes, the tension lever 36 rotates around the fulcrum shaft 35, so the movement is caused by the tension spring 37 and the lever 38.
The signal is then applied to the gear shift lever 9 by mechanical transmission means. Therefore, the transmission 6 automatically changes its gear ratio in response to changes in the tension of the warp yarns 26, and always maintains the tension of the warp yarns 26 at a target value.

When a horizontal insertion error occurs and the stop signal S2 is given, the stop switch 47 is turned off, so the relays 44, 45 immediately open the contacts 48, 49, 52,
The driving of the drive motor 3 is immediately stopped, and at the same time, the electromagnetic clutch 16 is de-energized, and the coupled state is immediately released. However, due to rotational inertia, the main shaft 2 of the loom does not stop immediately, but only after a predetermined braking time T2 has elapsed. During this braking time T2, the warp yarns 26 are not fed out, so the tension of the warp yarns 26 is
There is an increasing trend. This high tension acts to suppress the movement of the weave 28 toward the scraping side, so that when restarting, it compensates for the lack of strain in the reed 54 and absorbs the loosening of the woven fabric 34. However, such damping, which serves to pull back the weave 28, is of course provided by suitable braking means or the like. The braking time T2 at this time corresponds to the rotational speed of the loom around one rotation.

Then, while the loom is stopped, work such as removing and repairing the defective weft thread 33 is performed. During such work, normally after two rotations of reverse rotation, inching operation in the forward or reverse direction is required, but even during this time, the electromagnetic clutch 16 is set in a disconnected state. Since the rotation of the main shaft 2 is caused by the delivery beam 24
Moreover, at this time, the winding roll 30
Even if the woven fabric 34 is reversed, the woven fabric 34 is frictionally held by the presto beam 29 and is also held by the temple 41 with a strong frictional force, so the woven fabric 34 only loosens and the woven opening 28 does not move much. Therefore, the warp threads 26
The tension of the weft thread 33 does not change, and the weft thread 33 remains in the same state as before repair.

In this way, you will be able to restart, and then:
When the operation signal S1 is input, the loom, in the same way as above,
The motor starts from a stop angle of, for example, 300 degrees based on the start-up characteristics of the drive motor 3. Of course, at the same time, the weaving movement, the punching movement, the winding movement, etc. are started.6 However, the feeding movement does not start until after the delay time T1.

When an external force is applied to the warp threads 26 and the woven fabric 34 during the first shedding movement at the initial stage of startup, the tension of the warp threads 26, which tends to be high, and the holding force of the woven fabric 34 by the temples 41, etc. are statically combined. The balance is broken and the cloth opening 28 is now substantially retracted for the first time. With this setback,
Looseness in the fabric 34 is immediately absorbed. The high tension of the warp threads 26 described above works effectively when the m machine is restarted. Moreover, since the weaving opening 28 is retracted from the normal position during the pause period of feeding, that is, the delay time T1, even if the rotation speed of the drive motor 3 does not reach the steady rotation speed at the initial stage of startup, The reed striking power of reed 54 is strengthened.

Therefore, in the early stages of startup, the intercalary membrane does not develop. And even during this delay time, winding is being carried out, so
The looseness of the woven fabric 34 is absorbed, and there is movement of the woven fabric 28 in the forward direction, so that no thick film is formed.

It should be noted that even when the shaft is stopped vertically, a reversal of one rotation corresponding to the inertial rotation is always performed, so that the same operation and effect as when the shaft is stopped horizontally can be obtained.

Other delay time setting means In the case of weft stop, the main shaft 2 is reversed two revolutions as described above in order to remove the defective weft thread 33. Furthermore, depending on the fabric, it may be necessary to reverse the rotation three or more times. Since the number of reverse rotations of the main spindle 2 differs in this way, it is necessary to adjust the delay time T1 accordingly.

FIG. 4 shows an example of adjusting the delay time TI. During the stop period, an "H" level signal S3 is input to one input of the AND circuit 55, and a signal S4 that generates, for example, one pulse per reverse rotation is input to the other input.
is input. This number of reversals is counted by a counter 56. Note that when the loom is stopped, this counter 56 is set to the reset state by the one-shot multi-by-break 60 to prepare for the next operation. Then, corresponding to the count value of this counter 56, one of the relays 57.5
8.59 is selectively driven. For example, when two reversals are performed, the second relay 58 is energized and the corresponding contact 67 is set to the on state.

Further, an "H" level signal S5 is input to one input terminal of the AND gate 61 when the loom is started. The signal is also transmitted through a resistor 62, a plurality of capacitors 63, 64 .
65 and a time constant circuit consisting of selection contacts 66, 67, and 68.

Therefore, the AND gate 61 excites the relay 69 after a predetermined delay time TI using the time constant (resistor 62, capacitor 64) corresponding to the selected contact 67. In this way, the delay time T1 upon restart is set to be longer in proportion to the number of reverse rotations of the loom. Note that the signal S5 is always maintained at the "H" level while the loom is operating.

In addition, by using the resistor 62 as a variable resistor, the reverse rotation 1
Unit delay time for rotation can be adjusted.

Effect of the invention The present invention provides the following unique effects.

First, just before the loom stops, the clutch immediately disengages, eliminating unnecessary feed of the warp threads, so the warp thread tension does not decrease, but on the contrary tends to increase due to the inertial rotation of the loom.

Further, since the clutch is in a disengaged state during reverse rotation or inching during stoppage, large fluctuations in warp tension can be avoided.

When the loom is reversed, the winding beam is reversely rotated, causing slack in the woven fabric. When the loom is started, this slack is dynamically balanced against the increasing tension of the warp yarns due to external forces such as shedding motion when the loom is started. , since the weaving head recedes, the beating force at the initial stage of starting the loom can be compensated for by the receding of the weave. Furthermore, since the retracted state of the cloth opening is maintained while decreasing for a predetermined delay time, insufficient beating force at the time of startup can be ensured over the delay time.

Therefore, it is possible to reliably prevent the occurrence of hidden combinations at the initial stage of startup.

Furthermore, although unwinding occurs after a predetermined delay time, winding starts immediately when the loom is started, so 11
Looseness of the woven fabric due to the reversal of the machine is quickly absorbed, eliminating the occurrence of thick films. Japanese Unexamined Patent Application Publication No. 1983 (1983) described in the section of the prior art
In the stop step prevention method of No. 21751, winding is not performed for at least two rotations when the loom is restarted, so if the loom is reversed during the stop period, the absorption of slack in the fabric will be delayed. , the formation of a thick film is unavoidable.

In addition, in the embodiment in which the predetermined delay time automatically changes according to the number of reversals, it is possible to set an appropriate delay time corresponding to reversals during the period when the loom is stopped. Appropriate responses can be taken at times.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the feed control device, Fig. 2 is a circuit diagram of the control circuit, Fig. 3 is a time chart for starting and stopping the loom, and Fig. 4 is another embodiment of the control circuit. FIG. 1. Loom sending/winding device, 2. Main shaft, 6
...Transmission, 16..Clutch, 17..Worm reducer, 20..Rewinding handle, 24..Feeding beam, 26..Warp, 28..Weave opening, 30..Take-up roll, 32.. - Winding beam, 33... Weft, 3
4... Woven fabric, 4I... Temple, 43... Movement switch, 46... Timer relay, 47... (Uto switch, 50... Control circuit, 53... Delay contact, 54... Receptacle, 56 ... Counter, 62 ... Variable resistor, 63.64
．． 65... Capacitor. Patent applicant Tsudakoma Kogyo Co., Ltd. Figure l

Claims (3)

[Claims] (1) In the process of converting the rotation of the main shaft of the loom into rotation in one direction using a transmission, the gear ratio of the transmission is changed in response to changes in warp tension, and the output rotation of the transmission is controlled by the clutch and worm. In the sending-off/winding device of a loom, which transmits the rotation of the main shaft to the sending beam by a speed reducer and the rotation of the main shaft to the take-up beam, the clutch is immediately disengaged when the loom is stopped, and when the loom is reversed during the period when the loom is stopped. The reverse rotation of the main shaft is transmitted to the winding beam, and when the loom is subsequently restarted, winding is started immediately, and the clutch is brought into a connected state after a predetermined delay time, and unwinding is started after a predetermined delay time. A method for preventing mating steps, which is characterized by the following. (2) A method for preventing mating rows according to claim 1, characterized in that the delay time is made proportional to the number of reversals during a period when the loom is stopped. (3) The method for preventing mating stages according to claim 2, characterized in that the delay unit time per one number of reversals can be varied in accordance with weaving conditions.