JP2760678B2 - Winder speed control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winder for winding a sheet material into a coil, and more particularly to a speed control device for a winder for rounding the speed when winding a winding coil to a predetermined length.

[0002]

2. Description of the Related Art FIG. 4 is a schematic structural view of a main body of a paper winding machine. As shown in the figure, the sheet material 1 is moved in the X-arrow direction by a winding roll 3 driven by an electric motor 4, a winding roll 5 driven by an electric motor 6, and a winding roll 7 that only presses. While being conveyed, it is wound up as a winding coil 2.

In this case, the sheet material 1 is used as the winding coil 2.
When winding has been performed by the designated length, winding rolls 3 and 5 must be stopped. Therefore, a speed reference is calculated based on set values such as a normal winding speed, an acceleration time, and a winding length, and the motors 4 and 6 are speed-controlled in accordance with the obtained speed reference.

FIG. 2 shows a part of this speed reference, in which the acceleration region not directly related to the present invention is omitted and the range from the set speed to the stop is shown. That is, during the winding of the setting speed V _s, the length of the remainder should wound is lowered by deceleration stepwise increases from point A reaches a predetermined value,
Linearly drops from matched point G to a preset maximum deceleration at this maximum deceleration, further from the point H approaching the Jodo velocity V _o, the deceleration gradual reduction, i.e., the speed reference rounding is performed drops to zero in a known reduction curve from point I became Jodo velocity V _o.

[0005]

Among the above-mentioned speed references, the maximum deceleration rate (the slope of the straight line GH) and the rounding time (between the curves GH) are set by the operator, respectively. It can be seen that the maximum deceleration rate should be increased and the rounding time should be appropriately determined in accordance with the deceleration rate. Incidentally, if the maximum deceleration rate is increased, the point H at which the rounding is started is moved to a position where the speed is higher. In addition, there is a relationship that if the point H is moved, the winding length during the rounding becomes longer.

Conventionally, however, since the rounding is started when the remaining length to be wound becomes constant, the tension is continuously smoothed even if the maximum deceleration rate and the rounding time can be changed. It was difficult to set to change. Therefore, the operator often operates in a specific narrow range of deceleration time with a small fluctuation in tension, and as a result, there is a problem that it is difficult to improve the work efficiency.

The present invention has been made in order to solve the above-mentioned problems. Even if the maximum deceleration rate is changed, it is possible to prevent a fluctuation in tension at the time of rounding, thereby improving the work efficiency. An object of the present invention is to provide a speed control device for a winder.

[0008]

SUMMARY OF THE INVENTION The present invention, taking up the sheet material by winder steady winding speed V _s, Jodo velocity V _o immediately before stopping, the maximum speed that can drive the deceleration rate of the winder A deceleration time T _dec , expressed as a time to stop, a rounding time T _rnd for gradually decreasing the deceleration when approaching the expulsion speed during deceleration of the winder, and winding of a sheet material wound by the winder a setting unit for setting a length L, respectively, and winding length measuring means for measuring the winding length L _t of the sheet material wound on the winder, set the deceleration time T _dec and rounding time T _rnd based am with computing the deceleration change rate Δα of the winder and the winding this calculates the deceleration α of the winder on the basis of the deceleration change rate Δα and set the Jodo velocity V _o, and which are set Before measured as length L The difference between the Makitocho L _t is lowered in accordance with the deceleration α of the winding speed V _s when it becomes a predetermined value, the size is lowered in accordance with the maximum deceleration from the corresponds to the maximum deceleration, rounding A speed reference calculation unit for calculating a speed reference V of the winder that descends according to a deceleration α that decreases in accordance with a deceleration change rate Δα from when the start command R is given to a removal speed V _o; rATE [Delta] [alpha], deceleration alpha, and a winding length computing means in rounding for calculating the winding length L _b in rounding based on the set the Jodo velocity V _o, the winding length L set difference, starts rounding for generating a start command R rounding if they match the winding length obtained by adding a constant value to the winding length L _b in said rounding the calculated and the winding length L _t which is measured Judgment means.

[0009]

[Action] In the present invention, the calculated deceleration rate of change [Delta] [alpha], deceleration alpha, and calculates the winding length L _b in rounding based on the set the Jodo velocity V _o, the winding length winding a length obtained by adding a constant value L _b is the rate of generating a start command R rounding when it becomes equal to the difference between the set winding length L and said measured winding length L _t Since rounding is performed, smooth rounding is always performed even if the maximum deceleration rate is changed, thereby preventing tension fluctuation and improving work efficiency.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. The apparatus mainly includes a setting unit 10, a speed reference calculating unit 20, a winding length measuring unit 31, a winding length calculating unit during rounding.
41 and a rounding start determining means 42.

The setting unit 10 controls the normal winding speed V
a winding speed setter 11 for setting the _s, the Jodo speed setter 12 for setting the Jodo speed V _o, the acceleration time from stop state as the maximum acceleration rate until it reaches the maximum speed drivable T _acc
An acceleration time setting device 13 for setting a deceleration time _Tdec from the highest speed to the stop as a maximum deceleration rate, a rounding time setting device 15 for setting a rounding time _Trnd , A winding length setting device 16 for setting the winding length L of the winding coil 2 is provided.

The speed reference calculating unit 20 calculates an acceleration / deceleration change rate Δα based on the set acceleration time T _acc , deceleration time T _dec, and rounding time T _rnd.
21, the acceleration / deceleration change rate Δα, and the set acceleration time T
_acc and thereby calculates the acceleration alpha based on the deceleration time T _dec, and acceleration calculating means 22 for calculating the acceleration alpha gradually decreases by rounding start command, the acceleration alpha, set winding speed V _s 2 and all the speed references V except the line GH are calculated based on the gradual movement speed V _o , and the speed reference V _d given to the line GH between the straight lines GH is calculated. Is the speed reference V
The speed reference calculating unit 23 for outputting as the computed acceleration change rate [Delta] [alpha], acceleration alpha, set Jodo velocity V _o, Makitocho L, speed reference based on the measured winding length L _{t Vd} is calculated and the speed reference calculating means 24 is applied to the speed reference calculating means 23 during deceleration.

The winding length measuring means 31 measures the winding length by counting the output pulses of a pulse generator (not shown) connected to the winding roll 3. Further, during winding length computing means 41 rounding is for calculating the winding length L _b in rounding based set Jodo velocity V _o, of the calculated acceleration change rate Δα and acceleration α . Further, a rounding start determining means
42, when the difference between the winding length L _t which is measured as set winding length L, consistent with a length obtained by adding a constant value to the winding length L _b in rounding, acceleration speed calculating means 22 Is given a rounding start command R.

The operation of this embodiment constructed as described above will be described below with reference to the diagrams showing the relationship between time and speed shown in FIGS. Incidentally, the speed reference from the winding start until the normal winding speed V _s is the velocity reference computation unit 23
However, since this portion is not directly related to the present invention, a detailed description thereof will be omitted.

First, the acceleration time setting device 13 sets an acceleration time T _acc for raising the winder from the stopped state to the maximum drivable speed, and the deceleration time setting device 14 sets a deceleration time until the winder is stopped from the maximum speed. T
_{While dec} is set, the rounding time setter 15 sets the rounding time _Trnd . In this case, acceleration variation rate calculating unit 21 calculates the maximum acceleration alpha _max and a maximum deceleration alpha _max by the following equation.

Α _max = V _max / T _acc (1) α _max = V _max / T _dec (2) where V _max is the maximum winding speed.

[0017] Among them, the maximum acceleration alpha _max is the calculation of the speed reference of the case of accelerated the winder, maximum deceleration alpha _max
Is used for calculating the speed reference when the winder is decelerated.

The acceleration / deceleration change rate calculating means 21 calculates the minimum value of the acceleration / deceleration to be added or subtracted within one scan, which is the minimum time unit of the control device, that is, the acceleration / deceleration change rate Δα by the following equation.

Δα = α _max / T _rnd (3) Then, the acceleration / deceleration calculating means 22 calculates the acceleration / deceleration change rate Δα
Is added for each scan to obtain a deceleration α shown in the following equation.

[0020] α = Δαt ... (4) In this case, the acceleration calculating means 22 for limiting the maximum value so as not to maximum deceleration alpha _max above with reference to the deceleration time T _dec.

The speed reference calculating unit 23, A point difference between the measured winding length L _t by setting value L and the winding length measuring means 31 for winding length setter 16 reaches a predetermined value (Fig. 2 The normal winding speed V set by the winding speed setting unit 11 as the speed reference V until
_s is output as it is, and after point A, V _s
-Αt is output.

In this case, a point G attached to the speed reference curve in FIG. 2 showing the relationship between the speed v and the time t is a position where the maximum deceleration rate is reached, and a point H is a position where the maximum deceleration rate is rounded. Where point I is a position corresponding to the gradual movement speed, and F is a stop position. If the points on the time axis corresponding to the points A, G, H, and I are B, C, D, and J, respectively, A-G
The area enclosed by -HIFJDCCBA corresponds to the winding length of the sheet material. Among them, the deceleration curve GH
And the point at which it intersects the time axis is denoted by E,
As shown in (a) to (e), the area surrounded by HEDH is L _a , the area surrounded by HJDH is L _b ,
The area enclosed by HIJEH is L _c , IFJ
The area surrounded by -I L _d, an area surrounded by the G-E-C-G and L _e.

The reduction in speed reference calculation unit 24 outputs the deceleration reference V _d was calculated by the following equation G point deceleration α reaches the maximum deceleration.

[0024]

(Equation 1) However L _o: residual winding length L: winding length setter 16 setting L _t: winding measurements L _e of Tocho measuring means 31: G-E-C- G enclosed by the area L _c: It is the area enclosed by HIJEH.

[0025] Here, the area L _c is calculated using the area L _b, which is calculated by the in winding length computing means 41 rounds, which will be described later, for L _d, Jodo velocity V _o and the winding speed V _s A fixed value is used because it is extremely small in comparison. At this time, the speed reference calculating means 23 sets the deceleration reference V
Output _d .

On the other hand, during the winding length computing means 41 rounds seek area L _b in rounding interval but the table as the area L _b by using the deceleration rate of change [Delta] [alpha], Jodo velocity V _o the formula Is done.

[0027]

(Equation 2) Substituting t = α / Δα, which is a modification of α = Δαt in equation (4), into this

[0028]

(Equation 3) That is, the winding length calculating means 41 during rounding calculates Δα calculated by the acceleration / deceleration change rate calculating means 21, α calculated by the acceleration / deceleration calculating means 22, and the gradual speed V set by the gradual speed setting device 12. computing the area L _b by the operation of the basis (8) to _o.

The rounding start determining means 42 is a winding length setting device.
16 from winding length L with subtracting the measured winding length L _t of the winding length measuring means 31, and the difference (L-L _t), obtained by adding a fixed value corresponding to the area L _d in area L _b When the value coincides with the value, a rounding start command R is output and added to the acceleration / deceleration calculating means 22. The acceleration / deceleration calculating means 22 calculates Δ
The deceleration α that decreases by α is output.

[0030] Therefore, the speed reference calculating means 23 rounds start command R and outputs a speed reference V follows from point G to be output to the point I made in Jodo velocity V _o.

[0031]

(Equation 4) Incidentally, an output (9) during deceleration time V _d is the start command R rounding is outputted in formula speed reference calculating unit 24.

The time of this result, the winding and Tocho setter 16 winding length L set in the difference between the measured winding length L _t in winding length measuring means 31 (8) becomes equal to the equation By reducing the deceleration α in the speed reference calculating means 23 and starting the rounding of the speed reference V, a smooth speed can be obtained.

By the way, the area L _c for which the explanation has been suspended is described above.
Is the area obtained by subtracting the area L _a from the area L _b obtained from the equation (8). Here, the speed at point H to determine the area L _a following formula

[0034]

(Equation 5) , And the area L _a because deceleration at this time is α is

[0035]

(Equation 6) Can be expressed as In addition, t = t obtained by transforming α = Δαt in equation (4)
Substituting α / Δα gives

[0036]

(Equation 7) Becomes Then, from the area L _b obtained by equation (8), (12)
Area obtained by subtracting the area L _a obtained by Equation is L _c, is calculated by the following equation.

[0037]

(Equation 8) Thus, at the time of starting the automatic deceleration, taking into account the area L _c advance, and, in rounding before the Jodo rate, by taking into account the area L _b, it has to decelerate at maximum deceleration Speed can be smoothly transitioned to round,
As a result, control with less fluctuation in tension becomes possible.

Although the above embodiment has been described with respect to a papermaking winder, the present invention is not limited to this, and can be applied to most winders for winding sheet materials.

[0039]

As evidenced by the foregoing description, according to the present invention, calculates the winding length L _b in rounding, the winding length obtained by adding a constant value to the winding length L _b, since the instruction to start R rounded when it equals the difference between the measured and the set winding length L the winding length L _t generated thereby rounding speed, changing the maximum deceleration rate, rounding Can be prevented from fluctuating in tension at the time of moving to, and thereby the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between speed and time for explaining the operation of one embodiment of the present invention.

FIG. 3 is a pattern diagram corresponding to distances obtained by decomposing a diagram showing a relationship between speed and time in order to explain an operation of one embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a main body of a paper winding machine to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Setting part 20 Speed reference calculation part 31 Winding length measuring means 41 Rounding winding length calculating means 42 Rounding start judging means

Claims (1)

(57) [Claims] 1. A constant winding the sheet material by a winder winding speed V _s, deceleration expressed in time to bring to a stop from Jodo velocity V _o, the maximum speed that can drive the deceleration rate of the winder immediately before stopping A setting section for setting a time T _dec , a rounding time T _rnd for gradually decreasing the deceleration when the speed approaches the removal speed while the winder is decelerating, and a winding length L of a sheet material wound by the winder. When the winding length measuring means for measuring the winding length L _t of the sheet material wound on the winder, the deceleration rate of change of the winder on the basis of the set the deceleration time T _dec and rounding time T _rnd while calculating the [Delta] [alpha], based on the deceleration change rate [Delta] [alpha] and set the Jodo velocity V _o to calculate the deceleration α of the winder, and was determined to the winding length L set the Winding length L
the difference between _t descends according deceleration α from the winding speed V _s when it becomes a predetermined value, the size is lowered in accordance with the maximum deceleration from the corresponds to the maximum deceleration, rounding start command R is A speed reference calculation unit for calculating a speed reference V of the winder that descends according to the deceleration α that decreases in accordance with the deceleration change rate Δα from the given to the removal speed V _o , and the calculated deceleration change rate Δα , winding length L _b in rounding based on deceleration alpha, and set the Jodo velocity V _o
A winding length computing means in rounding for calculating a set the winding length difference between L and measured the winding length L _t is computed the constant value winding length L _b in rounding And a rounding start determining means for generating a rounding start command R when the winding length matches the winding length obtained by adding the winding length.