JP2712292B2 - Method of preventing weaving steps from occurring on loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for preventing the occurrence of a weaving step due to a machine stand stop.

[Prior Art] Proper maintenance of the tension of the warp sent from the warp beam is achieved by controlling the warp sending speed, and the generation of the weaving step during weaving can be relatively easily prevented. To prevent the occurrence, it is necessary to adjust the cloth fell position when the machine is restarted. An apparatus for that purpose is disclosed in Japanese Patent Laid-Open No.
No. 2 discloses this. In this conventional apparatus, a machine drive motor and a cloth position correcting motor are operatively connected to a surface roller via a differential gear mechanism. Position correction is performed. As a result, it is possible to prevent the weaving step from being generated due to an insufficient beating force when the machine is restarted.

[Problem to be Solved by the Invention] However, since the cloth fell position correction is performed only before the machine restart, the proper cloth fell position correction that is different at each beating time after the machine restart is possible. It is difficult to perform such collective cloth fell position correction. Therefore, it is not possible to improve the correct weave position correction, and it is not possible to achieve a more effective weave step prevention action.

JP-A-59-53746 discloses an apparatus for variably controlling the weft density during operation of a loom, but does not mention anything about the generation of a weaving step when the machine is restarted.

Means for Solving the Problems According to the present invention, the number of beats detected before the machine rotation reaches the steady rotation speed after the machine restart is detected by the beating number detecting means, and the normal rotation is performed. After correcting the cloth fell position in accordance with the preset cloth fell position correction amount corresponding to each beating time until the speed is reached, a correcting operation of holding this cloth fell position until the beating time is performed by each beating. It was performed sequentially at each time point.

[Effect] Every time each beating time after restarting the machine is detected, the cloth fell position correction corresponding to the set cloth fell position correction amount corresponding to the detected beat time is performed. As a result, an appropriate cloth fell position correction is performed every several beating times after the machine is restarted, and a more effective weaving step prevention action can be obtained.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a side view of the entire loom, and a warp T sent from a warp beam 2 driven by a feed motor 1 independent of a machine drive motor (not shown) passes through a back roller 3 and a tension roller 4. Heald 5, via
The reed 6 is guided to a weaving device 7 including a weft insertion device and the like (not shown), and is formed from a weave front W1 to a woven fabric W. Then, an expansion bar 8, a surface roller 9, and a press roller 10 are formed.
Then, it is wound around the winding shaft 12 via the wrinkle removing guide member 11. The tension roller 4 is attached to one end of the tension lever 13, and a predetermined tension is applied to the warp T by a tension spring 22 attached to the other end of the tension lever 13.
Is to be given. The tension lever 13 is rotatably supported at one end of the detection lever 14, and a load cell 15 is connected to the other end of the detection lever 14. Accordingly, the warp tension is transmitted to the load cell 15 via the tension roller 4, the tension lever 13, and the detection lever 14, and the load cell 15 outputs an electric signal corresponding to the warp tension to the loom control computer C.

The loom control computer C compares the tension preset by the input setting device 16 with the detected tension grasped by the input signal, detects the rotation angle of the machine, and outputs the origin signal at the time of beating from the rotary encoder 17. The rotation speed of the delivery motor 1 is controlled based on the warp beam diameter calculated based on the detection signal and the input data such as the initial warp beam diameter and the fabric structure. As a result, the warp tension during the normal operation is controlled, and the generation of the weaving step is prevented. The loom control computer C instructs the forward rotation operation of the delivery motor 1 based on the ON signal from the start switch 18, and rotates the delivery motor 1 based on the rotation speed detection signal from the rotary encoder 1a incorporated in the delivery motor 1. Feedback control of speed.

The surface roller 9 is operatively connected to a rewindable rewinding motor 20 via a reduction gear mechanism 19, and the rewinding motor 20 is controlled by the loom control computer C. The loom control computer C is turned on from the start switch 18.
The operation of the winding motor 20 is commanded based on the signal, and the rotation speed of the winding motor 20 is feedback-controlled based on a rotation speed detection signal from a rotary encoder 20a incorporated in the winding motor 20.

The loom control computer C includes a machine stop signal generator 21 such as a weft insertion error detector, a warp cut detector, and a manual stop switch.
A command to stop the operation of the feed motor 1 and the take-up motor 20 is issued based on a machine stop signal from the controller, and a weaving step prevention program shown in the flowchart of FIG.

After stopping the operation of the take-up motor 20 by the transmission of the machine stop signal, as shown in FIG. 2, the delivery motor 1 is operated based on the transmission of the start signal S by turning on the start switch 18, and the delivery motor 1 is moved to the state shown in FIG. rise in the curve C ₁ shown, it reaches a normal rotational speed V in synchronization with the machine frame drive motor. After starting the machine, the rotary encoder 17 outputs an origin signal at the time of beating, but the beating of the weft is not performed at the time of the first origin signal transmission. In response to the input of the first origin signal, the loom control computer C instructs a corrected rotation speed preset by the input setting device 16 as the rotation speed of the winding motor 20 at the time of the second beating.

Each time the origin signal is transmitted after the second time, the loom control computer C responds to the input of the origin signal to set the corrected rotational speed Vi as the rotational speed of the winding motor 20 at the next beating.
(I = 2 to n, n = 5 in this embodiment). Thus the rotational speed of the take-up motor 20 slide into close to the chain line curve C ₃ while drawing a curve C ₂ in Figure 2. Curve C ₃ shows the characteristic when the synchronization with the rising curve C ₁ for feeding the motor 1. Machine base correction rotation of the take-up motor 20 beating times after restart at between 5 th from second is performed, it reaches the normal rotational speed V ₀ to the sixth. The position of the front W1 woven fabric W by the correction rotation is displaced from the position ₀ of the normal δ in normal rotation of the loom as indicated by the curve C ₄ in FIG. 2 ₍₌ 0). The position δ ₂ is the position δ ₃ , δ ₄ , δ at the time of the second beating.
₅ shows a correction position of the third, fourth and fifth round of beating time, respectively, the cloth fell W1 is the fifth origin signal input after the normal position [delta] ₀
Return to.

When the reference signal input count i reaches five, the loom control computer C initializes the detected beating count.

The method of correcting the cloth fell position each time the weft beats after restarting the machine base enables the setting of the optimum cloth fell position for each beating. Insufficient striking force is properly compensated. Therefore, the compensation accuracy of the beating force shortage in the weaving step preventing action of the present embodiment is much higher than the collective correction before restarting the machine base, and the weaving step prevention is performed more effectively. High-speed rotation (approximately 800 rpm) in a system that applies a temporary overvoltage to the machine drive motor to obtain a sharp start-up characteristic in order to eliminate insufficient beating force when the machine starts up
Although it is not possible to prevent the occurrence of the weaving step in the above, the weaving step correction for each beating according to the present embodiment can reliably prevent the occurrence of the weaving step, and the speed of the loom can be further increased.

The present invention is, of course, not limited to the above-described embodiment. For example, for causes other than insufficient beating force, for example, warp elongation while the machine stand is stopped, weft insertion error handling work, and wound repair work on woven fabric, etc. The present invention may be applied to prevent the weaving step from being caused, or the same correction rotation control as that of the winding motor 20 may be performed on the delivery motor 1 in the above-described embodiment instead of the correction rotation control of the winding motor 20. Alternatively, the correction rotation control of both motors may be performed simultaneously.

[Effects of the Invention] As described above in detail, the present invention is configured to perform the cloth fell position correction for each beating during the rising after the machine restart, so that the cloth fell position correction is performed compared to the collective correction before the machine restart. As a result, the correction accuracy is increased, and an excellent effect of achieving a more accurate weaving step prevention action can be achieved.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a schematic side view, FIG. 2 is a graph for explaining the cloth fell position correction, and FIG. It is. A rotary encoder 17 as beating time detecting means, a winding motor 20 and a loom control computer C for performing a correcting operation, a normal rotation speed V, a machine rotation number i, and positions δ _{2 to} δ ₅ as a cloth fell position correction amount. .

Claims (1)

(57) [Claims] 1. A beating frequency detecting means detects the number of beatings until the rotating speed of the machine reaches the normal rotating speed after restarting the machine, and determines the time of each beating until the rotating speed of the machine reaches the normal rotating speed. After correcting the cloth fell position in accordance with the cloth fell position correction amount set in advance corresponding to the above, a weaving step in the loom that sequentially performs the correcting operation of maintaining the cloth fell position until the beating time is performed at each beating time. Prevention method.