JPH01181668A - Counter device for measuring length - Google Patents

Abstract

PURPOSE:To decrease difference between the set amount of length measurement and the cumulative amount of length measurement by updating the calculated value of deceleration slope on the basis of the past result of stopping operation, and further predicting the coasting amount from the current speed, and entering it into a comparator. CONSTITUTION:A memory means 1 of a correction circuit 20 stores the entered cumulative amount of length measurement L and the machine operating speed V and emits the operating speed VR when stopping operation for machine is commenced and the cumulative amounts of length measurement LR and LS at the time of stop signal St being given and at the time of perfect stopping. The amount of coasting Lia is calculated 2 from these signals LR and LS, and the deceleration slope is computed 3 from the amount of coasting Lia and the operating speed VR at the time stopping operation is commenced to serve for determination of the deceleration slope Dn-1, which is stored in a memory 4 temporarily. This is emitted as the calculated value Dn of deceleration slope on the basis of the past result of stopping operation. A coasting amount predicting means 5 emits the predicted value of coasting amount Li from the calculated value Dn and the current speed V. A comparator 12 emits stop signal St from the cumulative amount of length measurement L, the set amount of length measurement LT, and the coasting amount predicted value Li. Thereby the machine can be stopped certainly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a winding machine that processes and winds various long objects such as threads, filaments, and sheet-like objects. The present invention relates to a length measurement counter device for stopping a machine in a state where the length of the machine accurately matches a predetermined set length measurement amount.

In conventional winding machines, the purpose of stopping the machine when the long object to be wound reaches a predetermined length measurement amount is as follows.
A so-called length measuring counter device is used.

The most common length measurement counter devices are, for example,
Detecting the length of the long object S traveling on the measuring roller MR and being wound onto the reel B as the number of pulses of a pulse signal Sp from a pulse generator PG connected to the measuring roller MR; This is integrated by a counter C and compared with the set length measurement amount LT to generate a stop signal St to the control device CM (FIG. 5). Here, the long object S is
The motor M1 is caused to travel via a feed roller TR driven by a motor M1, and the speed of the motor M1 is controlled by a control device CM to a constant speed set by a speed setter SM. is actively driven under tension control via a control system (not shown) so that the tension of the long object S to be wound up remains constant.

By the way, if the mechanical system must have a large inertia and the coasting from when the stop signal 8Si is output from the counter C until the machine comes to a complete stop cannot be ignored, then the set length measurement for the counter C = lLT. is the amount of caulking and coasting (the amount of long material S wound up on the winding frame B due to coasting from when the stop signal 3t is output until the machine completely stops). (The same applies hereinafter) must be taken into account. In particular, if the time required to stop the machine changes due to changes in the braking characteristics of the brake used to stop the machine over time, special measures are required to deal with changes in the amount of coasting during this time. This is the result. As such prior art, for example, the following is known.

That is, the coasting amount in the previous stop operation is memorized, and in the counter C, the actual cumulative length measurement amount is greater than the set length measurement amount LT by an amount corresponding to the stored coasting amount. If the stop signal St is output when a small amount is reached, the next stopping operation can achieve the intended purpose unless a new change occurs in the braking characteristics of the brake. (For example, the Tokuko Sho 6
(See Japanese Patent Publication No. 1-18504 and Japanese Patent Publication No. 15015/1983).

Problem to be Solved by the Invention According to the prior art, only the stored coasting amount in the previous stop operation is used as the correction amount for the set length measurement amount, so that the winding frame B is finally This is not always sufficient in terms of accurately matching the I wound up to the set length measurement amount. That is,
In these conventional technologies, the factor that causes a change in the amount of coasting is, for example, a change in the braking characteristics of the brake, and it is assumed that the operating speed of the machine is constant. However, in actual operation, , the type of long object to be set,
Situations often occur in which the operating speed of a machine changes or needs to be changed depending on the circumstances of the machine.

In this way, when the operating speed changes, the amount of coasting naturally changes accordingly, so simply correcting it using the amount of coasting in the previous stopping operation will not change the operating speed. It is impossible to obtain a satisfactory result for the current stopping operation in which has been changed.

Therefore, in view of the problems of the prior art, an object of the present invention is to focus on the fact that the amount of coasting is determined by the operating speed and deceleration gradient of the machine, and to calculate the deceleration gradient from the results of past stopping operations, and to calculate the By predicting and calculating the predicted value of the coasting amount from the value and the current driving speed, and using this predicted value as the correction amount for the current stopping operation, conventional methods such as changes in brake control characteristics can be The object of the present invention is to provide a new length measurement counter device that can appropriately respond to changes in the operating speed of a machine in addition to the fluctuation factors assumed by technology.

Means for Solving the Problems The configuration of the present invention to achieve the object includes a comparator that compares a set length measurement amount and an integrated length measurement amount and outputs a stop signal, and an inertia control for this comparator. A correction circuit that corrects and outputs the predicted value of the running distance is provided, and the correction circuit includes a deceleration gradient calculation means with a second memory means that calculates and updates the calculated value of the deceleration gradient based on past stopping operation results, and a machine The gist of the present invention is to provide a coasting amount prediction means for predicting and calculating a predicted value of the coasting amount from the operating speed of the vehicle and the calculated value of the deceleration gradient.

In addition, a pulse counter and a speed calculator are added, and the former inputs a pulse signal from a pulse generator and outputs an integrated length measurement amount, and the latter inputs a branch of the pulse signal,
The operating speed of the machine may also be output.

When using this configuration, the comparator first compares the set length measurement interval and the cumulative length measurement amount, and outputs a stop signal when the latter reaches the former, but at this time, Since the predicted value of the coasting amount from the correction circuit is input for correction, the actual output timing of the stop signal is at the point when the sum of the accumulated length measurement amount and the predicted value of the coasting amount matches the set length measurement interval. This will be accelerated to.

Here, the predicted value of the coasting amount is calculated by the correction circuit as follows. That is, the coasting amount prediction means of the correction circuit uses the current operating speed of the machine and the calculated value of the deceleration gradient updated by the deceleration gradient calculation means with the second memory means to predict the current stopping operation. The deceleration gradient calculation means calculates the calculated value of the deceleration gradient from the result of the stopping operation of the machine each time a stopping operation is performed, and stores the calculated value in the second memory means. The memory can be updated. Therefore, the predicted value of the coasting amount that is output from the correction circuit to the comparator and used in the current stopping operation is calculated and updated from the actual value of the current machine operating speed and the past stopping operation results. Since it is calculated based on the @calculated value of the deceleration gradient, it is possible to obtain the value closest to the actual coasting amount. That is, no matter what operating speed the machine enters into the stopping operation, it can be stopped at the cumulative length measurement closest to the predetermined set length measurement.

In addition, if a pulse counter and a speed calculator are added, and these receive the pulse signal from the pulse generator as input, the former outputs the cumulative length measurement amount, and the latter outputs the operating speed of the machine. , the pulse generator can be shared as a signal source for these information, so overall,
- Can be layer-friendly.

It works as described above.

Example Examples will be described below with reference to the drawings.

The length measurement counter device 10 includes a comparator 12 and a correction circuit 2.
0 (Fig. 1).

The comparator 12 inputs the set length measurement period LT and the integrated length measurement value from the outside, and the predicted value 1-i of the coasting amount from the correction circuit 20, and generates a stop signal St as its output.

The correction circuit 20 includes a first memory means 1, a coasting amount calculating means 2, a deceleration gradient calculating means 3, a second memory means 4, and a coasting amount predicting means 5. Means 1 inputs the cumulative length measurement scale and the operating speed of the machine and stores these information at a predetermined timing, thereby determining the operating speed VR of the machine at the start of the stopping operation of the machine.
It is assumed that the integrated measurement length ff1LR, LS at the time when the stop signal 3t is output and the time when the machine completely stops is output.

The coasting amount calculating means 2 inputs the cumulative length measurement amounts LR and LS, outputs the coasting ILia@numerical, and calculates the deceleration gradient calculating means 3.
inputs the driving speed VR and the coasting amount lia, calculates the deceleration gradient [)n-1, and outputs this to the second memory means 4. The second memory means 4 stores the input deceleration gradient [
)n-1 is temporarily stored, and is outputted to the coasting amount prediction means 5 as the calculated value [)n of the deceleration gradient based on the past stopping operation results, and the coasting amount prediction means 5 A predicted value li of the amount of coasting in the current stopping operation is calculated using the operating speed V and the calculated value [)n of the deceleration gradient, and is output to the comparator 12.

Now, this can be roughly illustrated as shown in Figure 2.

For the length measurement counter device 10, a setting signal SL, which is the output of the length measurement amount setting device STL, is input from the outside as the setting measurement ff1.
The pulse signal Sp, which is input as LT and roughly the output of the pulse generator PG, is branched into the pulse counter PC and the speed calculator VC, and is input as the cumulative measurement length ML and the machine operating speed ■. ing. That is, the setting signal SL from the length measurement amount setter STL is input to the comparator 12, and the pulse signal Sp from the pulse generator PG is input to the comparator 12 via the pulse counter PC.

Further, the output of the comparator 12 is connected to a relay Ry, and its normally open contact RVa is brought out to the outside as a stop signal 3t.

The pulse signal Sp from the pulse generator PG is roughly input to the speed calculator VC, and then sent to the pulse counter PC.
It is input to the correction circuit 20 together with the output of. That is, the output of the speed calculator VC is branch-connected to the stop detection section 21, the memory 25, and the calculator 28, while the output of the pulse counter PC is branch-connected to the memory 22 and the memory 23. There is. The output of the stop detection section 21 is sent to the memory 2.
2, the output of the memory 22 is connected to the arithmetic unit 24 together with the output of the memory 23, and the output is connected to the memory 2
5 and is connected to another arithmetic unit 26.

The output of the arithmetic unit 26 is connected to the aforementioned arithmetic unit 28 via the memory 27, and its output is input to the comparator 2 as a corrected output signal 20a from the correction circuit 20. Note that the output signal @12a of the comparator 12 is also input to the correction circuit 20, and is branch-connected to the memory 23.25.

Assume that the machine is now operating at a constant speed VR. Since the pulse counter PC can count the number of pulses of the pulse signal SD from the pulse generator PG and output an integrated length measurement amount, the comparator 12 receives the input from the length measurement amount setting device STL. The set length measurement amount LT, the integrated length measurement from the pulse counter PC, and the predicted value L1 of the coasting amount input from the correction circuit 20 in the form of a correction output signal 2σa are compared, and L=LT−Li. It is possible to detect that ``is established'' and generate its output signal 12a.

Further, since the relay Ry is activated by the output signal 12a, the stop signal St is outputted to the outside.

When the stop signal St is generated, the machine starts decelerating, but
At that time, the output signal 12a of the comparator 12 is
Since branch input is also made to memory 23.25 in 0,
The memories 23 and 25 respectively store the cumulative length measurement scale and the operating speed of the machine at the time when the stop signal 3t was generated.
It can be stored as L=LR1V=VR and output. However, the speed calculator VC uses the pulse signal Sp
It is assumed that this is a kind of signal converter that can calculate the current operating speed of the machine from the pulse rate of , and output it.

On the other hand, when the machine has completely stopped, the stop detection section 21
operates, so the memory 22 stores and outputs the integrated length measurement scale at that time as L=LS. Therefore, the computing unit 24 can calculate the actual coasting amount 1-ia in the current stopping operation as 11a=LS-LR, and the computing unit 26 can calculate the deceleration gradient [) in the current stopping operation. n-1, Dn-1= 2 L ia/
It can be calculated as vR2 and stored and updated in the memory 27.

It is assumed that the contents of the pulse counter PC are cleared when the machine stop operation is completed.

In this way, the deceleration gradient [)n-1 in the current stopping operation stored in the memory 27 is used in the calculator 28 as the calculated value [)n of the deceleration gradient in the next time. That is, when the next machine operation is restarted and the automatic stop function by the length measurement counter device 10 is started, the computing unit 28 uses the current machine operating speed ■ to calculate the coasting amount. Since the predicted value i is predictively calculated as Li=V''Dn/2 and outputted to the comparator 12 as the corrected output signal 20a, the next stopping operation can be performed in the same manner.

Note that an appropriate deceleration gradient Do is stored in the memory 27 in advance as an initial value to be used at the time of the first stopping operation.

Now, the machine that was operating at the operating speed Vl (at the time to
Upon receiving the stop signal 3t at , a constant deceleration gradient [)n
It is assumed that the speed is decelerated at -1 and comes to a complete stop at time 1 (Figure 3). At this time, from time to to time t
Since the coasting amount lia in the time interval 1 is represented by the area of the hatched triangle in the figure,
L 1a=VRt/2. Therefore, the deceleration gradient [)n
-1 is defined as [)n-1=t/VR, then Dn-1
=2Lia/VR2 can be 17, and furthermore, [)
By setting n = [)n-1, VR = V, Lia = l-i, and transforming this equation, Li = V2[)n/2 becomes '+
46°, that is, the deceleration gradient calculated by the calculator 26 [)
n-1 is calculated by back calculating the average deceleration slope when the machine is linearly decelerated using the actual coasting amount 1ia-LS-LR when decelerating to a stop from the operating speed VR. On the other hand, the predicted value 1-i of the coasting amount calculated by the calculator 28 is such that the average deceleration gradient is
The amount of coasting when decelerating to a stop is predicted from the current operating speed (2) based on what will be achieved in the current stopping operation. Generally, the average deceleration gradient [)n-1 calculated in this way has good reproducibility, and the predicted value L1 of the coasting amount at this time is a function of the driving speed ■. Therefore, since the influence of the change is taken into account, the length measurement counter device 10 can respond appropriately even when the operating speed (2) is changed.

Now, if we compare FIG. 1 and FIG. 2, the first memory means 1 in FIG. 1 is the same as the stop detection section 21 in FIG.
Hereinafter, the coasting amount calculation means 2 is stored in the calculation unit 24, the deceleration gradient calculation unit 3 is stored in the calculation unit 26, and the second memory means 4 is stored in the memory 27. It is clear that the quantity prediction means 5 correspond to the arithmetic unit 28, respectively.

Another embodiment of the deceleration gradient [)n-1 is as follows: [)n-1=
It may be defined as VR/l. At this time, the calculation content in the calculator 26 is Dn-1=VR according to this definition.
2/(2Lia), and the content of the calculation in the arithmetic unit 28 may be changed to Li=V''/(2Dn).

If you want to actively change the deceleration gradient during the current machine stop operation in accordance with the current operating speed of the machine, divide the computing unit 28 into two computing units 28a and 28b, and 25 outputs can be input together (Fig. 4). Since the calculated value On of the deceleration gradient for the operating speed VR at the start of the previous stopping operation has been obtained from the performance of the previous stopping operation, the calculating unit 28a first calculates the following:
Using the current driving speed ■ and the previous driving speed VR,
A correction coefficient k is determined for the previous calculated deceleration gradient value [)n. Here, the correction coefficient includes, for example, k=f (V
/Vo, VR/VO), where Vo is the reference operating speed, and f is the correction coefficient depending on the deviation of the operating speed ■ and VR from the reference operating speed VO. It is a function that determines the size of , and can be determined from past test data, etc. Thereafter, the computing unit 28a calculates the computed value [)nl of the deceleration gradient modified to correspond to T and the current driving speed ■ by [)nl=k[)n, so the computing unit 28b , using this, the above formula Li=■2Dn1/2 or Li
=V2/(2Dnl)kJ: IQ, predicted value of coasting amount 1
−i can be predicted and calculated.

In the above explanation, the pulse counter PC, the comparator 12, the speed calculator VC, and the calculator 28 are always operated in the operating state where the automatic stop function of the machine by the length measuring counter device 10 is permitted. , it is assumed that the operation is continuously executed. However, if the operating state has been reached,
When it is supplied in the form of some kind of signal and it can be assumed that there will be no change in the operating speed ■, the calculation unit 2
8 may be performed only when the signal is supplied.

Roughly speaking, the calculated value [)n of the deceleration slope calculated by the calculating unit 26, stored and updated by the memory 27, and used by the calculating unit 28 to calculate the predicted value L1 of the coasting amount is the calculated value [)n of For each operation, instead of updating sequentially so that the result based on the previous stop operation is applied to the current stop operation, a simple average of the results based on the results of a predetermined number of consecutive stop operations in the past, or an appropriate It is also possible to use a weighted average using a weight function. Also, at this time, by setting a limit value of an appropriate width for the calculated value [)n of the deceleration gradient, extreme fluctuations in the predicted value 1i of the coasting amount due to malfunction of the pulse generator PG, etc. can be eliminated. It shall be permitted to do so.

Further, it goes without saying that both the pulse counter PC and the speed calculator VC shown in FIG. 2 may be included in the length measurement counter equipment 10.

As described in detail, the present invention includes a comparator and a correction circuit that corrects and outputs a predicted value of the coasting amount to the comparator, and the correction circuit corrects and outputs a predicted value of the coasting amount to the comparator. and a coasting amount that predicts and calculates a predicted value of the coasting amount from the operating speed of the machine and the calculated value of the deceleration slope. By providing a prediction means, the predicted value of the amount of coasting used for the current stopping operation can be determined by the amount of coasting used for the previous stopping operation. However, since the current operating speed of the machine and the calculation of the deceleration gradient in the past stopping operation (1a) will be used, it will be calculated based on the calculation of the deceleration gradient in the past stopping operation (1a). In addition, even when the operating speed determined by the operating conditions rarely changes, the machine can be stopped accurately with a predetermined cumulative length measurement that is sufficiently close to the set length measurement amount. effective.

Note that by adding a pulse counter and a speed calculator, the pulse generator can be used in common to output the cumulative length measurement amount and the machine operating speed, respectively. Since these necessary information can be obtained only by inputting a signal, there is also the practical effect that -m can be easily used as a whole.

[Brief explanation of the drawing]

1 to 3 show an embodiment, in which FIG. 1 is a schematic block diagram, FIG. 2 is an explanatory diagram of the overall system, and FIG. 3 is an explanatory diagram of operation. FIG. 4 is a main part system diagram showing another embodiment. FIG. 5 is an explanatory diagram of the state of use showing the prior art. LT...Setting length measurement amount Shi...Integrated length measurement amount 1-i.
...Predicted value of coasting amount Dn, Oni...Calculated value of deceleration gradient ■, VR...Machine operating speed 3t...Stop signal @ Sp...Pulse signal PG...
・Pulse generator PC...Pulse counter ■C...
・Speed operator 3...Deceleration gradient operator stage 4...Second memory means 5...Coasting amount prediction means 10...
Measurement counter installation 12...Comparator 20...Correction circuit

Claims (1)

[Claims] 1) A comparator that compares a set length measurement amount and an integrated length measurement amount and outputs a stop signal; The correction circuit comprises a correction circuit that corrects and outputs the predicted value, and the correction circuit includes a deceleration gradient calculating means with a second memory means that calculates and updates the calculated value of the deceleration slope based on the results of past stopping operations, and a deceleration slope calculation means with a second memory means, and A length measurement counter device comprising: coasting amount prediction means for predicting and calculating a predicted value of the coasting amount from the speed and the calculated value of the deceleration gradient. 2) A pulse counter that inputs a pulse signal from a pulse generator and outputs the cumulative length measurement amount, and a speed calculator that inputs the pulse signal and outputs the operating speed of the machine is added. A length measuring counter device according to claim 1.