JP2718056B2 - 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 caused by a machine stand stop.

(Conventional technology) The proper tension maintenance of the warp sent from the warp beam is achieved by controlling the diameter yarn sending speed, and the generation of the weaving step during weaving can be relatively easily prevented. Therefore, it is necessary to correct the cloth fell position before restarting the machine stand in order to prevent the occurrence of the weaving step when the warp is elongated. Methods for preventing the effect of warp elongation to prevent weaving steps are disclosed in JP-A-54-106661 and JP-A-55-54387. In both of the means, the warp tension is reduced after the machine stand is stopped, and the warp elongation during the machine stand stop due to the warp tension is suppressed. This prevents the weaving step from occurring due to the elongation of the warp while the machine stand is stopped.

(Problems to be Solved by the Invention) However, in the means disclosed in Japanese Patent Application Laid-Open No. 54-106661, the warp tension is reduced immediately after the machine stand is stopped. However, since the machine stoppage time is short and the warp elongation is relatively small, weaving steps are hardly generated, and the tension is reduced even when it is not always necessary to reduce the warp tension. This means that an unnecessary process is performed. If unnecessary tension reduction is performed, an unnecessary process for applying a predetermined tension is further required when the machine is restarted, and a reduction in work efficiency is inevitable. . Moreover,
Since the tension at the time of restarting the machine is only applied by the spring force and the machine is restarted without knowing the actual tension of the warp, the weaving step may be generated on the contrary.

In the means disclosed in Japanese Utility Model Laid-Open No. 55-54387, the amount of movement of the tension roller for applying tension to the warp is always constant, and it is not possible to reduce the tension in accordance with the different elastic coefficients for each type of warp. That is, when the elastic coefficient is large, the reduction ratio of the tension is small even if the tension roller moves by the fixed amount, and when the elastic coefficient is small, the tension suitable for all types of the warp is such that the warp loosens as it hangs down. No reduction can be made.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for preventing a weaving step from occurring due to warp elongation during stoppage of a machine stand, regardless of the type of warp, without performing unnecessary tension reduction unlike the related art. is there.

(Means for Solving the Problems) Therefore, according to the present invention, the time measurement is started from the time when the machine stop signal is transmitted, and if the measured time does not reach the preset time, the warp tension is reduced. If the measured time reaches a preset time without performing the operation, the warp tension is reduced by at least one of the forward rotation operation of the warp feed motor and the reverse rotation operation of the woven cloth winding motor. When the warp tension is detected by the tension detecting means during the warp tension reducing operation, the tension reducing operation is performed until the detected warp tension reaches a preset tension, and the machine is restarted. The warp tension detected by the tension detecting means by the operation reverse to the operation of at least the motor that performed the warp tension reducing operation of the warp sending motor and the winding motor is reduced to the tension during normal operation. The tension increasing operation was performed until the machine returned, and then the machine restarted.

(Operation) When the time from when the machine is stopped to when the machine is restarted does not reach the set time, the machine is restarted without reducing the tension. If the time from when the machine is stopped to when the machine is restarted exceeds the set time, the machine is restarted after performing the tension reduction and the tension recovery. Therefore, by appropriately selecting the set time according to the type of warp, unnecessary tension reduction and tension return can be avoided. Further, the tension of the warp is detected by the tension detecting means during the warp tension reducing operation, and the tension reducing operation is performed until the detected tension of the warp reaches a preset tension. By appropriately setting according to the type of warp, appropriate tension reduction suitable for all types of warp can be performed, and the generation of weaving steps can be prevented.

(Embodiment) Hereinafter, an embodiment of the present invention will be described 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. Weaving device 7 including heald frame 5, reed 6, weft insertion device (not shown)
After being guided to the side and formed into a woven fabric W from the cloth fell W1, it is wound on the winding shaft 12 via the expansion bar 8, the surface roller 9, the press roller 10, and the wrinkle removing guide member 11. The tension roller 4 is attached to one end of a tension lever 24, and a predetermined tension is applied to the diameter thread T by a tension spring 14 attached to the other end of the tension lever 24. Tension lever
The tension lever shaft 25 with 24 fulcrums is the detection lever 13
It is supported by. Detection lever 13 is a detection lever shaft
26 is a fulcrum, and the other end is connected to the load cell 15. Accordingly, the warp tension is transmitted to the load cell 15 via the tension roller 4, the tension lever 24, the tension lever shaft 25, and the detection lever 13. Therefore, the load cell 15 outputs an electric signal corresponding to the warp tension to the control computer C.

Detection signal and the initial warp beam diameter from the control computer C compares the detected tension T _x to be grasped by a tension T ₀ set in advance by the input setting unit 16 the input signal and the machine base rotation angle detecting rotary encoder 17 The rotation speed of the motor 1 is controlled based on the warp beam diameter calculated based on the input data such as 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 control computer C is turned on from the start switch 18.
Command the forward rotation operation of the delivery motor 1 based on the signal,
Rotary encoder 19 incorporated in feed motor 1
The feedback control of the rotation speed of the delivery motor 1 is performed based on the rotation speed detection signal from the controller.

The control computer C issues a command to stop the operation of the feed motor 1 based on a machine stop signal from a machine stop signal generator 20 such as a weft insertion error detector, a warp cut detector, a manual stop switch, and the like. The weaving step generation prevention program shown in the flowchart is executed.

The time signal from the timer 21 is input to the control computer C, and the control computer C starts time measurement in response to the input of the machine stop signal. Start signal is input setting device 16
If the transmission is made before the time t ₀ set in advance by the control computer C, the control computer C ends the time measurement,
The normal rotation of the delivery motor 1 is commanded. As the set time t _0, it is sufficient to set a time at which the influence of the weaving step generation due to the elongation of the warp T increases due to the tension T ₀ during normal operation,
This time setting it is possible to omit an unnecessary process such as performed immediately tension reducing after the machine base is stopped, it is possible to omit an unnecessary process of it is returned to the front machine frame restarted tension T ₀ during normal operation, Improve work efficiency.

When the activation signal originating before the measured time t has reached the set time t _0, the control computer C ends the counting, as well as commanding the forward rotation of the feed motor 1, an instruction to blink an alarm lamp 22. As a result, the feed motor 1 rotates forward and the alarm lamp 22 blinks. The warp T is fed by the forward rotation of the feed motor 1, and the tension of the warp T is reduced. This tension reduction is grasped in the control computer C via the load cell 15, the control computer C detected tension T _x is an instruction to stop the motor 1 feed upon reaching the tension T ₁ previously set by the input setting unit 16 . Thus the tension of the warp T is accurately reduced to the set tension T _1. Therefore, setting by setting the low tension value in a range that does not induce growth of the tension T ₁ as zero or warp threads T, the warp yarns T in the machine base is stopped after the lapse of a set time t ₀ from the machine base stop The tension becomes a tension that does not cause the warp T to elongate, and the elongation of the warp T while the machine stand is stopped is reliably avoided. Thus, the weaving machine W1 does not move from the normal position when the machine is restarted, and the generation of the weaving step due to the warp elongation is reliably prevented.

After the tension is reduced, a tension return signal is input to the control computer C by the ON operation of the tension return switch 23, and the control computer C sends the motor 1 based on the tension return signal.
Command of reverse rotation. As a result, the delivery motor 1 rotates in the reverse direction, and the tension of the warp T increases. Together with the control computer C stops the reverse rotation command of the motor 1 feed when the detected tension T _x has reached the tension T ₀ during normal operation, to release the blinking warning lamp 22. Accordingly, the warp tension T is accurately restored to the tension T ₀ during normal operation, a weft bar upon restart does not occur. When the tension is reduced, even if the start switch 18 is turned on before the ON operation of the tension return switch 23, this start signal is invalidated, and the machine is restarted without performing the tension return. Never.

The present invention is, of course, not limited to the above-described embodiment. For example, in a loom that drives a surface roller by a take-up motor that can be rotated forward and backward independently of a machine drive motor, the take-up motor is rotated in reverse to reduce the tension. Alternatively, the tension may be reduced by both the feed motor and the take-up motor. Also, set time t ₀
The previously programmed set according to the warp type, a method of identifying a set time t ₀ by specifying the warp types are possible.

(Effect of the Invention) As described in detail above, the present invention does not perform the operation of reducing the warp tension when the time counting from the transmission of the machine stop signal does not reach a preset time. When the set time has been reached, the warp is sent out to reduce the tension, and the tension is reduced until the detected tension detected by the tension detecting means reaches a preset tension. Is designed to increase the tension when the detected tension detected by the tension detecting means returns to the tension during normal operation, and then to restart the machine, so that unnecessary tension reduction when the machine is stopped can be reduced. It is possible to reduce tension appropriately without warp and before warp elongation occurs regardless of the type of warp, and weaving caused by warp elongation when the machine is stopped for a long time or when the machine is stopped on holidays, etc. Step generation can be reliably prevented At the same time, it has an excellent effect that the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention,
FIG. 2 is a flow chart showing a program for preventing weaving steps. Delivery motor 1 constituting warp delivery means, load cell 15 as tension detecting means, timer as time measuring means
21, the control computer C, the warp T, detected tension T _x, set tension T _1, the set time t _0, measurement time t.

Claims (1)

(57) [Claims] 1. A timer is started from the time when a machine stop signal is transmitted, and if the measured time does not reach a preset time, the operation for reducing the warp tension is not performed, and the measured time is not measured. When the preset time is reached, the warp tension is reduced by at least one operation of the forward rotation operation of the warp delivery motor and the reverse rotation operation of the woven fabric take-up motor,
When the warp tension is detected by the tension detecting means during the warp tension reducing operation, the tension reducing operation is performed until the detected warp tension reaches a preset tension, and the machine base is restarted. The tension increasing operation is performed until the tension of the warp detected by the tension detecting means by the operation reverse to the operation of at least the motor that performed the warp tension reducing operation of the warp sending motor and the winding motor returns to the tension during the normal operation. A method for preventing the generation of a weaving step in a loom that is performed and then restarts the machine.