JPS617165A - Sheet winder - Google Patents

Abstract

PURPOSE:To enable precise winding by controlling a variable frequency power source connected to an induction motor for driving the winding shaft with correspondence to the required rotary speed and rotary torque operated in accordance to the winding length or the winding diameter of sheet. CONSTITUTION:The sheet winding shaft is driven through an induction motor M which is driven through a variable frequency power source 10 connected to A.C. power source. Said power source 10 is controlled by a winding tensile controller 20 and a winding speed controller 30. The winding tensile controller 20 is constructed with a section 22 for operating the necessary winding tensile on the basis of the outputs from the setting section 21 and the winding detecting section 40 and a section 23 for operating the required torque of motor M to produce said winding tensile for current winding diameter. While the winding speed controller 30 is comprised of a section 32 for operating the rotary speed of motor on the basis of the outputs from the sheet feeding speed detecting section 31 and the winding detecting section 40.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a winding device for a strip-like sheet such as paper or plastic film, particularly a slitter that winds a wide strip-like sheet while dividing it into a plurality of narrow strip-like sheets. Regarding a winding device.

<Conventional technology> For example, in a slitter winding machine with the most advanced control technology,
Each divided sheet strip is divided into two groups, each group is equipped with a common drive shaft and a set of DC motors that rotate this, and a magnetic particle clutch is inserted in the transmission mechanism from the common drive shaft to each winding shaft. This allows the winding tension to be individually controlled for each winding shaft. This is because even in sheet strips obtained by dividing the same sheet, there may be slight thickness unevenness depending on the dividing position, and in order to wind these with high quality, it is necessary to control the tension of each sheet individually. A DC motor is suitable for adjusting the winding speed, and a magnetic particle clutch is suitable for controlling the winding tension. Another type uses a separate DC motor for each winding shaft.

<Problems that the invention seeks to solve> A direct current motor or a combination of this and a magnetic particle clutch, apart from the fact that the equipment itself is relatively expensive, has the problem that fine powder from the motor's current collecting carbon brushes floats in the air. Since there is a risk that the dust may adhere to the sheet being wound, large-scale dust extraction equipment is required. Also, maintenance work to deal with wear of the carbon brushes is essential. Furthermore, since the magnetic powder clutch continues to dissipate excess electrical energy as heat due to slipping, it is not desirable from an energy economical standpoint.

<Means for Solving the Problems> Therefore, the present invention rotates the winding shaft for winding the sheet of a sheet winding device using an induction motor, and provides a variable frequency power supply device between an AC power source and the induction motor. The output signals of the required rotational speed and required rotational torque calculated according to the winding length or winding diameter of the sheet wound by the winding shaft during winding are given to the variable frequency power supply device, and the induction motor is rotated. It is characterized by controlling the speed and rotational torque according to the output signal using a variable frequency power supply device.

<Function> The variable frequency power supply device is a well-known commercial product, and for example, as shown in FIG. It is a combination of E and E. The effect of an inverter is that by operating the inverter while maintaining a proportional relationship between voltage and frequency, it is possible to obtain the torque characteristics of an induction motor as shown in Figure 5, and to achieve stable operation with drooping characteristics at any rotational speed and an energy-saving effect. and speed control is possible. Note that the curve of rotational speed 600c, rprn-) in Fig. 5 is 20H.
z/67V, 1200 curve is 4゜Hz/133V
, 1800 curve is 6DH2/200V, 2
The 400 curve is 90Hz/260V.

In this way, the induction motor can perform speed control based on stable torque characteristics, so this induction motor alone can perform winding control comparable to a conventional combination of a DC motor and a magnetic particle clutch. That is, the present invention suffices to control the speed according to the speed of the sheet traveling path itself, rather than using an extra speed to account for slip in the magnetic particle clutch, as in conventional speed control of a DC motor.

Since that speed is the original speed under the required winding torque,
Applying the required torque and speed to the variable frequency power supply device, the fifth
Let them select the necessary frequency and voltage from the characteristics as shown in the figure.

The rotational speed of the electric motor cannot keep up with the sheet feeding speed unless it is rotated at a high speed when the sheet winding diameter indicated by the winding shaft is small, and as the winding diameter increases, the rotational speed of the motor becomes slower. In addition, the sheet feeding speed (that is, the winding speed) is slow at the start and end of winding υ, and is constant during that time, so it is calculated from the feeding speed and the detected value of the notebook winding diameter (or winding amount). The winding speed control device provides the required motor rotational speed.

On the other hand, the winding tension control device is usually set with a tension gradually decreasing control curve (taper control pattern), which determines the winding tension corresponding to the growth of the sheet winding diameter, and further calculates the winding torque required for this. The calculation result is input to the variable frequency power supply device through a suitable interface along with the motor rotation speed of the speed control device. This allows the induction motor to achieve the required rotational speed at its winding diameter,
Since the winding shaft is rotationally driven by the winding torque, energy is not wasted due to the slippage of the conventional magnetic powder clutch, and there is no risk of contamination by carbon powder caused by the DC motor.

<Embodiment> Fig. 1 shows a sheet dividing winding device according to an embodiment of the present invention, but the control device is omitted, so the only difference from the conventional one is the location where the magnetic particle clutch was installed. It just has an induction motor M attached to it. As shown in FIG. 4, the electric motor M in this embodiment has a converter C1 inverter ■
AC power supply P via a variable frequency power supply device 10 with
The variable frequency power supply device 10 is normally installed near the control panel, so the first
Omitted in the figure. The AC power source P may be, for example, a three-phase AC power source or a single-phase AC power source.

In FIG. 1, A is a winding shaft (or winding core adapter), B is a common touch roller, K is a slitter blade, R is a sheet roll that is raised vertically without winding, and S is a supply sheet. /
is each winding section, /α is a winding arm that swings with a winding shaft A attached to the tip, /b is a pedestal on which it is placed and moves on the traversing ped 3, and K is the winding arm /α. Using a swinging fluid pressure cylinder, winding is started by bringing the winding shaft A at the tip of the arm closer to the touch roller B as shown by the chain line, and as the winding diameter increases, the arm /a is raised with appropriate force and the winding is started. Then, stand the sheet roll R vertically as shown in the figure and transfer the sheet roll R to the transport device.

The strip-shaped sheet S is divided by the slitter blade K directly under the common touch roller B, and when the adjacent divided sort goes around the touch roller B, it is distributed to the left and right and wound around the winding shaft A of the respective winding section. . FIG. 2 shows a state in which the respective winding portions are lined up on one side.

In addition to the sheet winding device shown in FIG. 1, there are various types of sheet winding devices even if they are split winding systems, and the present invention can be applied to any of them. The example shown in FIG. 5 is of a type in which a touch roller B' is provided at each winding section, and its support l moves along a beam S.

In this example, the induction motor M is not on the winding arm /a,
Although it is attached to the pedestal lb, since the intermediate pulley is provided in the same window as the swing axis of the arm /a, there is no problem even if the arm /a swings. Further, in the sheet division winding type of the embodiment shown in FIG. 9, unlike the one shown in FIG. 6, a touch roller B' is pivotally supported by a support stand and attached to the end of a hanging swinging arm 6.

This swinging arm 6 is pushed with an arbitrary pressure force by a fluid pressure cylinder 7 which has a supporting base pivoted on its side, and the contact pressure between the touch roller B' at the tip of the swinging arm 6 and the sheet roll R is applied to the swinging arm 6. can be freely controlled. The motor M in this embodiment is attached to the take-up arm /a. In this example, since the winding arm/α itself tends to swing, a mechanism for swinging the transverse bed 3 is used, or a mechanism is used to move the sheet roll R away from and approaching the touch roller B' on this transverse bed. It is desirable to provide a mechanism for moving the transverse bed, for example, a mechanism for placing the transverse bed on the rail in the above-mentioned separation/approach direction and pushing and pulling the transverse bed in the above-mentioned direction using a hydraulic cylinder.

FIG. 6 is an example of a block diagram of the control mechanism of the present invention. 10 is the variable frequency power supply device 10 shown in FIG. 4, which is a commercially available product. Uθ is a winding tension control device, and 3θ is a winding speed control device.

The winding tension control device 0 is not new, and as in the past, uses a small computer, and has a setting section 2/ stored with a formula for calculating a tension gradual decrease curve.

The winding tension required for the current winding amount is calculated by inputting the input from both the setting section ko/ to the tension calculation section and the well-known winding amount (diameter) detection section 0. Then, in the adjacent torque calculation section,
The required torque of the electric motor M to generate the above-mentioned winding tension at the current winding diameter (diameter of the wound sheet roll) is calculated and outputted to the variable frequency power supply device 10. Note that even if the winding amount detection device measures the feeding length, it can be converted into the winding diameter.

The winding speed control device 30 drives the winding shaft so that the sheet is always wound at the same speed even if the separately controlled sheet supply speed gradually increases at the beginning, remains constant, and then gradually decreases. The calculation unit 32 receives the signal from the sheet supply speed detection unit 31 and the signal from the take-up amount (diameter) detection unit qo, calculates the rotational speed required for the electric motor M at the current take-up diameter, and operates the variable frequency power supply. Output to the device 10.

When the variable frequency power supply device/θ is instructed to specify the rotational speed and torque required for the induction motor M, it generates the appropriate frequency and torque.
The voltage turns an induction motor M. In Fig. 5, if the rotational speed υ and torque q are specified,
Frequency 40Hz/voltage 1 that creates the second characteristic curve from the left
53■ is selected.

Various types of variable frequency power supply devices 10 that operate in this manner are commercially available, and detailed description thereof will be omitted.

The block diagram in Fig. 7 is an embodiment in which feedback control is added to the block diagram in Fig. 6, so the new additions are:
This is the comparison control section Juda in the winding speed control device 20 and the torque detection section SO between the winding shaft A of the motor M1. Feedback control improves the accuracy of winding torque. As an example of the torque detection section S0, FIG. 8 shows one developed by the present inventor Kasaki. An induction motor M is attached to the take-up arm /a in FIG. and the load cell which is pressed between the frame O side member and the frame O side member. load cell g
By multiplying the load detected by the distance between this and the motor shaft, the actual torque produced by the motor M can be obtained.

Of course, any torque detector may be used, such as one based on the well-known drive belt tension difference, one using a transmission gear unit, or a commercially available torque detector.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that changes and applications can be made as appropriate using well-known techniques of designers in accordance with implementation conditions without changing the gist of the invention.

<Effects of the Invention> This invention overturns the recently established idea that a DC motor and magnetic particle clutch are essential for high-quality winding.

For the first time, we succeeded in using an inexpensive, robust, and easy-to-maintain induction motor as the power source for precision winding. In the case of an induction motor, a variable frequency power supply device is added to this, and the required rotational speed of the motor is determined from the sheet winding amount (diameter) and the sheet feeding speed detection value using the winding speed and winding tension control device. By determining the required torque of the motor from the detected value of the winding amount (diameter) and the set tension gradual reduction control calculation formula, and feeding the respective calculation results to the variable frequency power supply, it is comparable to the combination of a DC motor and magnetic particle clutch. Winding control is now possible.

It is also easy to increase accuracy by adding feedback control. Since the induction motor can be easily installed near the winding shaft of each of the many winding arms of the split winding machine, the influence of the transmission mechanism can be reduced.

This invention solves the problem of carbon powder floating in a DC motor and the energy waste of a magnetic powder clutch at once.

[Brief explanation of the drawing]

Fig. 1 is a front view of an example of a split winder to which the present invention is applied, Fig. 2 is a side view of its main parts, Fig. 5 is an explanatory diagram of another embodiment, and Fig. 4 is an explanation of a variable frequency power supply device. Fig. 5 is an example of a torque characteristic diagram of an induction motor with a variable frequency power supply device, Fig. 6 is a block diagram of the control mechanism of the present invention, Fig. 7 is a block diagram with feedback control added, and Fig. 8 9 is an explanatory diagram of an example of a winding torque detection device, and FIG. 9 is an explanatory diagram of yet another embodiment of a split winding machine. Take-up speed control device, 3θ/take-up speed control device. No. 3 uiA Procedural Amendments (total August 21, 1985)

Claims (1)

[Claims] A winding shaft for winding the sheet is rotationally driven by an induction motor, and a variable frequency power supply device is provided between an AC power source and the induction motor,
The output signals of the required rotational speed and required rotational torque calculated according to the winding length or winding diameter of the sheet wound by the winding shaft during sheet winding are given to the variable frequency power supply device, and the induction motor is A sheet winding device characterized by controlling rotational speed and rotational torque according to an output signal using a variable frequency power supply device.