JPS63143178A - Tension control device - Google Patents

Abstract

PURPOSE:To automate offset adjustment by extracting and storing the data containing the tension offset information among outputs of a tension detector, decreasing the tension detection value from the tension command value, and adding or subtracting the memory value of the said tension offset information to obtain a tension control signal. CONSTITUTION:The output of a tension detector 6 is stored in an offset value memory (memory means) 18 in advance before the operation. Then, the tension detection value detected by the tension detector 6 is subtracted from the tension command value from a tension setting unit 7, and in addition the tension offset value stored in the memory 18 is added or subtracted. Accordingly, the output of the tension detector 6 is automatically offset-adjusted, and an adequate tension control signal is outputted from a tension control unit 8.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a tension control device in a line system.

[Prior Art] An example of a tension control device that uses a variable speed electric motor to drive a controlled object and perform tension control between the controlled object and a line system is a loom warp delivery control device. However, FIG. 2 shows a schematic configuration of this loom warp delivery control device. This device includes a tension control system and a current control system inside the tension control system. That is, the tension applied to the warp threads 2 sent out from the delivery roll 1 is detected by the tension detection lever 4. It is detected by a load cell 6 (this load cell 6 has a bridge circuit configuration) as a tension detector attached via a spring 5, and this load cell detection signal is used as a tension feedback signal.

This signal is subtracted from the tension command signal from the tension setting section 7 and the deviation signal is sent to the tension control section 8, and the deviation between the control signal from the tension control section 8 and the current feedback signal is sent to the current control section 9. The output of this current control section 9 is sent to a delivery motor 10 as a variable speed motor to control the driving state of the delivery roll 1 and perform tension control.

By the way, the detection signal of the load cell 6 includes not only the tension of the warp threads 2 but also the tension of the feed rolls 3. Tension detection lever 4. Splash 5
Since weights such as the above are also converted and included, in order to remove information other than warp tension, offset adjustment of the tension feedback signal is performed by adjusting the offset adjustment section 11 before operation.

The offset adjustment section 11 is as follows.

There are analog and digital types, but in either case adjustments must be made to match the mechanism of the loom.

In addition, in FIG. 2, 12 is a load cell amplifier.

[Problem that the invention attempts to solve] ・However,
With such conventional tension control devices, it is necessary to perform offset adjustment at the stage when the feed control device and the loom are combined, and furthermore, the amount of offset adjustment depends on the mechanical elements of the loom, so it depends on the type of loom and the feed roll. , which differs depending on the type of tension detection lever and cannot be determined uniquely, so there is a problem that offset adjustment takes time and effort.

The present invention has been made to solve these problems, and an object of the present invention is to provide a tension control device that automates offset adjustment based on the tension detection signal ↓.

[Means for Solving the Problems] Therefore, the tension control device of the present invention includes a tension detector and a tension setting means, and captures and stores the output of the tension detector having tension offset information. The tension is determined by subtracting the detected value detected by the tension detector from the tension command value from the tension setting means and adding or subtracting a stored value having tension offset information stored in the storage means. A tension control means for outputting a control signal is provided.

[Function] In the tension control device of the present invention described above, for example, the output of the tension detector is stored in advance in the storage means before operation, and then the tension detected value is subtracted from the tension command value and stored in the storage means. The existing tension offset value is added or subtracted. As a result, the output of the tension detector is automatically offset-adjusted to obtain an appropriate tension control signal.

[Embodiments of the Invention] The present invention will be specifically described below with reference to illustrated embodiments. FIG. 1 is a block diagram showing a schematic configuration of a loom warp delivery device having a tension control device as an embodiment of the present invention, and also in this device.

As in the past, it has a tension control system and a current control system inside it. In other words, the delivery roll 1 as a controlled object
The tension applied to the warp threads 2 sent out from the feed roll 3
Tension detection lever 4. It is detected by a load cell 6 (this load cell 6 has a bridge circuit configuration) as a tension detector attached via a spring 5, and this load cell detection signal is used as a tension feedback signal, and this signal is sent from the tension setting section 7. The deviation signal is sent to the tension control section 8, and the deviation between the control signal from the tension control section 8 and the current feedback signal is sent to the current control section 9. The output is sent to a delivery motor 10 as a variable speed motor to control the driving state of the delivery roll 1 and perform tension control.

By the way, an input interface circuit 13 (this circuit 13 is implemented as hardware) is provided for converting the detection signal (analog signal) from the load cell 6 into a digital signal. This input interface circuit 13
is equipped with a load cell amplifier 14 and an A/D conversion circuit 15.

Note that this input interface circuit 13 also has a power supply circuit 16 for the load cell bridge.

In addition, the output of this input interface circuit 13 is supplied via the switch means 17 to an offset value memory 18 as a storage means, and is also sent as a minus signal to an addition/subtraction calculation means 19 which constitutes a tension control means together with the tension control section 8. It is now being supplied.

Further, the switch means 17 is turned on and off in response to an offset adjustment signal from the external control device 20, and when the switch means 17 is turned on, the detection signal from the load cell 6 is stored in the offset value memory 18. It looks like this.

Here, the external control device i! From 20, an offset adjustment signal is outputted, for example, before operation when the loom is not in operation. At this time, the detected value of the load cell 6 does not include tension information of the warp yarns 2, and the value detected by the load cell 6 does not include tension information of the warp yarns 2. Tension detection lever 4. Since it has only the offset information caused by the spring 5 etc., this value is stored in the offset value memory 1.
8, the offset information can be detected from the load cell 6.

In addition, the initial value in the offset value memory 18 at the time of memorization is set to zero, and even if there is a power outage.

The offset value memory 18 is backed up in preparation for when the operation is stopped. Therefore, the value in the offset value memory 18 will not change until the next offset adjustment signal is input.

In addition, the addition/subtraction calculation means 19 receives a detection signal from the load cell 6 as a tension feedback signal, as well as a storage signal (offset corresponding signal) having offset information from the offset value memory 18 and a tension feedback signal from the tension setting section 7. Setting signals are input, and the addition/subtraction calculation means 19 outputs a deviation signal based on these signals. In other words, the deviation is TREFA, and the tension setting value is TRE.
E, tension feedback value TFB, offset value T
REFZ, the addition/subtraction calculation means 19 performs the calculation TREFA=TREF−TFB±TREFZ6. In reality, the tension feedback value TFB from the load cell 6 is temporarily stored in a tension feedback value memory (not shown). In addition to being stored, the deviation TRE FA is also stored in a memory (not shown). Further, the offset value TREFZ is stored in the offset value memory 18, but the tension setting value TRE
F is also stored in the memory of the tension setting section 7.

In this way, the deviation information obtained by the addition/subtraction calculation means 19 is input to the tension #tube section 8, and this tension control section 8 outputs an appropriate tension control signal with offset adjustment. The current is output to the current control section 9.

Note that the portion within the frame indicated by the symbol A in FIG. 1 is converted into software.

With the above-described configuration, prior to operation of the loom, an offset adjustment signal is output from the external control device 20, and when the switch means 17 is closed, the detected value from the load cell 6 is stored in the offset value memory 18 as an offset value.

Thereafter, the delivery motor 10 is driven to operate the loom, and at this time, the addition/subtraction calculation means 19 is used.

Regarding the detected value TFB from the load cell 6, the offset value TREFZ from the offset value memory 18, and the tension setting value TREF from the tension setting section 7.

The calculation TREF-TFB±TREFZ is performed, and the result is supplied to the tension control unit 8 as a deviation value TREFA, and is further returned to the delivery motor 1o as a feedback signal via the current control system including the current control unit 9. . As a result, the tension of the warp threads 2 is controlled with the offset adjustment automatically applied.

This provides first-order effects or advantages.

(1) Even if there are mechanically unstable elements such as the feed roll 3 of the loom and the tension detection lever 4, complicated offset adjustment is not necessary.

(2) When tension control is realized by software, automatic offset adjustment can also be processed only by software, and no increase in hardware is involved.

Note that it goes without saying that the means for tension control and automatic offset adjustment may be configured by hardware.

Further, in the above-mentioned embodiments, explanations have been given using a loom as an example, but the present invention can be applied in exactly the same manner to tension control of a device that handles cloth or other objects.

Furthermore, it goes without saying that something other than a load cell can be used as the tension detector.

Further, if offset adjustment is always performed before operation, automatic offset correction can be performed even without an offset adjustment signal from external control device 20.

[Effects of the Invention] As detailed above, according to the tension control device of the present invention,
There is an advantage that an appropriate tension control signal can be obtained by easily realizing automation of offset adjustment for the tension feedback signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a Wl having a tension control device and a machine warp delivery control device as an embodiment of the present invention, and FIG. 2 shows a schematic structure of a conventional loom warp delivery control device. It is a block diagram. In the figure, 1. - outlet port (controlled object), 2...
・Warp thread, 3-feed roll, 4-tension detection lever. 5-Spring, 6-Load cell (tension detector), 7-Tension setting section, 8-Tension control section, 9-Current control section, 10-- Delivery motor (variable speed motor), 13--Human power interface circuit , 14--Load cell amplifier, 15-A/D conversion circuit, 16-Bridge power supply circuit, 17-Switch means, 18-Offset value memory (storage means), 1! ;l-
Addition/subtraction calculation means constituting tension control means, 20--external control device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a tension control device that drives a controlled object using a variable speed electric motor and performs tension control between the controlled object and a line system, tension detection detects the tension between the above-mentioned controlled object and the line system. and a tension setting means for setting a tension command value, storage means for capturing and storing the output of the tension detector having tension offset information, and a storage means for capturing and storing tension offset information from the output of the tension detector; Tension control means is provided for subtracting the detected value detected by the tension detector from the value and further adding or subtracting a stored value having tension offset information stored in the storage means to output a tension control signal. A tension control device featuring: