JP2791489B2 - Monitoring device for warp under tension in loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a warp under tension monitoring device for a loom, and more particularly, to a warp over tension and an under tension monitored during operation and stop of the loom. The present invention relates to a device for improving the operability of a weaving operation of a loom by preventing output of an under tension abnormal signal while the loom is stopped.

[Conventional technology and technical issues to be solved]

As is well known, in a loom, the tension of the warp sent from the warp beam is monitored not only during operation but also during a stop, and the tension of the warp falls within a yarn tension setting range optimal for weaving set in advance. The warp sending motor is controlled to fit.

By the way, in the above-mentioned loom, when the warp tension greatly exceeds the upper limit value of the allowable range of the specified yarn tension or falls below the lower limit value during operation, the pitch of the warp (the distance between the yarns) ) Is disturbed, resulting in defects such as “uneven weave” in the woven fabric. Also, if the warp tension exceeds the upper limit of the allowable range due to the operation of winding the warp onto the cross beam or maintenance while the loom is stopped, the warp breaks and the warp occurs on the woven fabric. Become.

However, when replacing the warp beam or performing other maintenance while the loom is stopped, there is a demand to perform the operation in a state where the tension of the warp is greatly exceeded (loose) than the lower limit of the allowable range.

Nevertheless, in conventional looms, as shown in FIG. 6, in order to further enhance the safety during repair work for defective woven fabrics, abnormal tension in the warp yarns regardless of the running or stopped state of the looms. When it is detected, the driving motor drive unit D of the loom is detected.
And the circuit of the delivery motor drive unit G is automatically turned off, and all operations are prohibited. For example, the transmission motor is not driven even when the transmission operation switch is turned on. Therefore, during the stop of the loom, the warp is sent in a state where the tension of the warp exceeds the lower limit of the yarn tension setting range, or the winding motor is operated in order to adjust the tension by winding the warp. Also, the warp tension monitoring function was activated, the tension abnormality signal was output, and the loom was in the operation-prohibited state. So the switch S ₄ · S of the operator after the cancellation of the output of the tension abnormality signal to turn on the reset switches S _3, the manual operation circuit for driving the let-off motor driving unit G alone to complete this task ₅ is operated to rotate the let-off motor LM, had done machine threading operation while inching the loom by inching switch S ₂ of the loom as well as condition the warp. Thereafter, the manual operation by operating the switches S ₄ · S ₅ of the circuit, the work troublesome that rotates the let-off motor LM to add warp tension in the yarn tension setting range to further allow the restart of the loom Had gone. For this reason, the work efficiency has been reduced and the reset switch
If accidentally pressing the operation switch S ₁ since the cancel the tension abnormality signal loom also comprised danger of starts to rotate at S _3.

The present invention has been made in view of the above circumstances, and aims to improve the work efficiency and the like of the looming operation of a loom by disabling a warp under tension monitoring function only when the loom is stopped. It is an object of the present invention to provide a warp under-tension monitoring device in a loom capable of performing the following.

[Means adopted to solve the problem]

The means adopted by the present invention to solve the above problems will be described below with reference to the accompanying drawings.

That is, according to the present invention, the warp tension detecting means for detecting the tension of the warp during operation and stoppage of the loom and outputting a tension signal, and the upper limit and the lower limit of the warp tension in the allowable range of the tension can be preset. Outputting a tension abnormality signal when the value of the tension signal exceeds an upper limit value, and / or
Alternatively, the above-mentioned problem has been solved by employing a logical operation means for outputting a tension abnormal signal only when the value falls below the lower limit value during operation of the loom.

〔Example〕

Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

In FIG. 1, what is indicated by reference numeral 1 is a warp tension detector for detecting the tension acting on the warp during operation and stoppage of the loom. When detecting the tension applied to the warp, the warp tension detector 1 outputs a warp tension signal to a comparator 3 and a warp tension controller C described later. The warp tension detector 1 is not particularly limited, and may be any device that outputs the warp tension as an electric signal. In the present embodiment, for example, the warp tension extracted from the warp beam is used as a torque. The torque is converted to an electric signal corresponding to the torque, and the winding diameter of the beam is converted to an electric signal for detection, and the tension signal acting on the warp is detected by comparing the two electric signals. It adopts the method of doing. The warp tension signal input to the warp tension controller C is adjusted so that the warp tension signal approaches the optimum warp tension set value of the weaving conditions set in advance according to the level of the yarn tension signal value by the controller. Is calculated and processed by a tension control command signal for increasing / decreasing the value, and is output to the delivery motor drive unit G by the control unit. The sending motor driving unit G is provided with a logic circuit 4 described later.
If there is no tension abnormal signal output from the OR circuit 42 of the above, and an operation signal of the loom is input, the output motor drive signal is output to the output motor LM based on the tension control command signal. Further, when the operating signal of the tension abnormality signal and the weaving machine in the let-off motor driving unit G is not input together, the let-off motor driving signal for forward or reverse let-off motor by operating the manual switch S ₄ · S ₅ Output to the sending motor LM.

Reference numeral 2 designates an upper limit value setting device 21 for setting an upper limit value in an allowable range of the tension acting on the warp during operation and stop of the loom, and a lower limit value setting for setting a lower limit value in the allowable range. This is an allowable value setting device including the device 22. The upper limit value setting device 21 outputs an upper limit allowable signal to a comparator 3 described later when the upper limit value is set for the warp tension, and the lower limit value setting device 22 compares the lower limit allowable signal when the lower limit value is set for the warp tension. Output to the container 3.

The one designated by reference numeral 3 is a comparator for comparing the warp tension signal of the warp tension detector 1 with the upper limit allowable signal and the lower limit allowable signal of the allowable value setting device 2. This comparator 3
Is a first comparator that compares the warp tension signal with the upper limit allowable signal
31 and a second comparator 32 for comparing the warp tension signal with the lower limit allowable signal. The first comparator 31 outputs an overtension signal indicating that the warp tension is larger than the upper limit of the permissible set value when a relationship of “thread tension signal value> upper limit of permissible signal” holds, as described below. Output to the circuit 4. On the other hand, when the relationship of “thread tension signal value <lower limit value of permissible signal” is established, the second comparator 32 outputs an under tension signal indicating that the warp tension is lower than the lower limit value of the permissible set value. Is output to the logic circuit 4.

The one designated by reference numeral 4 is a two-input type AND circuit.
This is a logic circuit composed of 41 and an OR circuit 42. The AND circuit 41 includes a second comparator of the comparator 3 at one input terminal.
When an undertension signal is input from 32 and an operation signal of the loom is input to the other input terminal, the undertension signal is output to the OR circuit 42. When the over-tension signal is input to the one input terminal from the first comparator 31 of the comparator 3 or the under-tension signal is input to the other input terminal from the AND circuit 41, the OR circuit 42 outputs the warp thread. Output a tension abnormality signal indicating that the tension is abnormal. When this tension abnormal signal is input to the driving motor driving unit D and the sending motor driving unit G, the driving motor driving circuit is shut off, the output of the driving motor driving signal to the driving motor is stopped, and the operation of the loom is stopped. The output of the sending motor drive signal also stops, and the sending motor LM also stops. At the same time, the output of the operation signal of the loom is stopped. Further, the tension abnormal signal may be used as an operation signal of an indicator or an alarm device such as a lamp or a buzzer provided on the loom.

What is indicated by reference numeral 5 is a manual operation circuit that drives the delivery motor LM independently by inputting a signal to the delivery motor drive unit G. The manual operation circuit 5 is a circuit for rotating the delivery motor LM via the delivery motor drive section G when the loom is stopped and no tension abnormality signal is output. Switch S ₄ is rotated forward the delivery motor LM, the switch S ₅ reverses the let-off motor LM.

What is indicated by reference numeral D is a driving circuit of the loom for driving the driving motor DM. Loom drive circuit D
By operating the operation switch S ₁ and the inching switch S ₂ , a driving motor drive signal is output to the driving motor DM, and an operation signal of the loom is output to the sending motor driving unit G and the logic circuit 4. Further, when the tension abnormal signal is input, the output of the operation signal of the loom and the driving motor drive signal is prohibited.

As shown in FIG. 2, when the warp tension is detected by the warp tension detector 1 during the operation and stoppage of the loom, the warp tension signal is output from the warp tension signal as shown in FIG. The signal is input to the second comparator 32 of the comparator 3 and compared with the lower limit of the allowable value signal. The second comparator 32 outputs an undertension signal to the AND circuit 41 of the logic circuit 4 only when the thread tension signal value falls below the lower limit value. If the operation signal of the loom is input to the AND circuit 41, the tension signal is output to the OR circuit 42, and the tension abnormal signal output from the OR circuit 42 is output to the motor drive unit D of the loom. The drive circuit is turned off and the loom stops. However, if the operation signal of the loom is not input to the AND circuit 41, the circuit 41 does not output the under tension signal to the AND circuit 42, so that the OR circuit is used.
No abnormal tension signal is output from 42 and each drive circuit is not turned off.

FIG. 3 shows another embodiment of a mechanism for preventing the output of the under tension signal while the loom is stopped (other parts than those shown are omitted because they are the same as FIG. 1). Drive motor drive unit D
The loom operation signal output from the loom may be output to the second comparator 32, and the under tension signal from the second comparator 32 may be output to one terminal of the OR circuit 42. The function of this configuration is to stop the function of the second comparator 32 when the loom is stopped and the operation signal of the loom is not output, and to prevent the output of the under tension signal even when the warp tension falls below the lower limit. Acts to be.

The present invention is by no means limited to the above-described embodiment, and various modifications are possible within the scope of the claims. For example, as shown in FIG. Naturally, the processing of the logic circuit 4 is performed using a microcomputer. That is, the warp tension signal from the warp tension detector 1 is input to the input interface 8 via the A / D converter 7, and the operation signal of the loom and the upper limit value and the lower limit value of the allowable signal are input. As shown in FIG. 4, the processor 9 compares the thread tension signal value with the upper limit value of the allowable signal, and if the thread tension signal value is out of the range of the upper limit value, the output interface 10 outputs the driving motor and the sending motor. Output a drive stop signal and an abnormal tension signal. However, if the warp tension signal value is within the range of the upper limit, the process proceeds to the next processing operation, and it is determined whether or not the loom is operating. If the operation signal of the loom is not input to the arithmetic processing unit 9, even if the warp tension signal value is inside or outside the range of the lower limit value, the processing returns to the standby state without making the determination, and If the operation signal is input to the control unit, the thread tension signal value is compared with the lower limit of the allowable signal. As a result, if the thread tension signal value is out of the lower limit range, the interface
A drive stop signal and an abnormal tension signal for the driving motor and the sending motor are output to 10, but if the value of the thread tension signal is within the range of the lower limit, the process returns to the standby state.

As described above, in the present application, as shown in each embodiment, the drive stop signal is not output even when the warp tension exceeds the lower limit value only when the loom is stopped. since not turned manually the delivery motor by operating the forward and reverse switches S ₄ · S ₅ operation circuit, machine can inching operation of the drive motor seat by operating the inching switch S ₂ and the like Can be maintained freely.

(Effect of the present invention)

As described above, according to the present invention, according to the present invention, the yarn tension acting on the warp during the operation and stop of the loom is set to the upper limit of the warp tension allowable range set in advance for the same yarn. It is possible to change the warp state only when the tension of the warp falls below the lower limit of the allowable tension range while the loom is stopped, and perform operations such as jogging the loom. Operability such as maintenance is greatly improved.

[Brief description of the drawings]

1 is a functional block diagram of the apparatus of the present embodiment, FIG. 2 is a flowchart of the apparatus, FIG. 3 is a functional block diagram showing a modification of the apparatus, and FIG. 4 is FIGS. 3 and 5. FIG. 5 is a functional block diagram showing another embodiment, and FIG. 6 is a functional block diagram showing a conventional embodiment. 1 ... warp tension detector, 2 ... allowable value setting device, 3 ... comparator, 4 ... logic circuit, 41 ... logical product circuit, 42 ... logical sum circuit, 9 ... arithmetic processing unit.

Claims (4)

(57) [Claims] 1. A warp tension detecting means for detecting a warp tension during operation and stoppage of a loom and outputting a tension signal; an upper limit value and a lower limit value of the warp tension in a tension allowable range are set in advance; A logic operation means for outputting a tension abnormal signal only when the value of the tension signal falls below a lower limit value during operation of the loom, and a warp under tension monitoring device for a loom. 2. A warp tension detecting means for detecting a warp tension during operation and stoppage of the loom and outputting a tension signal; an upper limit value and a lower limit value of the warp tension in a tension allowable range are set in advance; Logic operation means for outputting a tension abnormal signal when the value of the tension signal exceeds an upper limit value, and outputting a tension abnormal signal only when the tension signal falls below a lower limit value during operation of the loom. A warp under tension monitoring device in a loom. 3. A warp tension detecting means 1 for detecting a tension acting on a warp during operation and stopping of a loom, and outputting a tension signal of the same; and an upper limit of the tension acting on the warp. Value setting means 2 for setting a value and a lower limit value and outputting an upper limit signal and a lower limit signal for the same yarn.
And comparing the tension signal value output from the warp tension detecting means 1 with the allowable signal value output from the allowable value setting means 2, and when the tension signal value exceeds the upper limit value of the allowable signal, A comparison means 3 for outputting a tension signal and outputting an under tension signal when the tension signal value falls below a lower limit value of an allowable signal; and inputting an under tension signal of the comparison means 3 and an operation signal of a loom; An AND circuit 41 that outputs the undertension signal only when the operation signal of the loom is being input; and an undertension signal of the AND circuit 41 or when an overtension signal input from the comparing means 3 is input. The OR circuit 42 outputs a tension abnormal signal to the machine. Warp under tension monitoring device in a loom, characterized in that it comprises a; and logic means 4, which is configured to block. 4. A warp tension detecting means 1 for detecting a tension acting on a warp during operation and stop of a loom, and outputting a tension signal of the same; and an upper limit of the tension acting on the warp. Value setting means 2 for setting a value and a lower limit value and outputting an upper limit signal and a lower limit signal for the same yarn.
And a tension signal of the warp tension detecting means 1, an allowance signal of the allowance value setting means 2 and an operation signal of the loom are inputted, and the tension signal value and the upper limit of the allowance signal are determined during the operation or stop of the loom. In comparison, while outputting the tension abnormality signal when the tension signal value exceeds the upper limit value of the allowable signal, the same tension signal value and the lower limit value of the allowable signal are output only when the operation signal of the loom is input. The arithmetic processing means 9 configured to prevent the output of the tension abnormality due to the under tension while the loom is stopped so as to output the tension abnormality signal when the tension signal value falls below the lower limit value of the allowable signal. And a warp under tension monitoring device in a loom, characterized by comprising: