JPS61273456A - Winder for sheet material - Google Patents

Abstract

PURPOSE:To prevent the generation of an unnecessary large tension difference and to prevent a sheet material from slipping at a transport roller portion by suitably balancing the wind-out tension with the winding tension from the winding start to the winding end. CONSTITUTION:The winding tension is controlled to gradually decrease with an increase in the diameter of a take-up roll 32, and the wind-out tension is controlled to gradually decrease with an increase in the diameter of the take-up roll 32. Therefore, a difference in the sum total of the wind-out tension and the winding tension is kept substantially at a naught or at a suitable small value from the winding start to the winding end, so that a tension difference between the take-up side and wind-out side at a transport roller portion 28 is kept small and such tension difference is easily absorbed by the frictional force between the transport roller 28 and a sheet material 23. Thus, a tension difference between the wind-out tension and the winding tension can be reliably kept within the range not to cause slipping.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sheet-like material winding device that winds a sheet-like material into a predetermined roll shape while unwinding a rolled-up sheet-like material. The present invention relates to a sheet-like material winding device that controls unwinding tension in relation to tension.

[Background Art] A winding device that rewinds a rolled sheet material into a predetermined roll shape, such as a sheet material that cuts a wide rolled sheet material into a plurality of strips of a predetermined width. A slitter or the like that winds up a slitter generally has a structure as shown in FIG. That is, an unwinding unit 3 that unwinds the sheet-like material 2 from the raw fabric roll 1 wound into a roll, a conveyance roller 4 that transports the sheet-like material 2, and a winding section 3 that unwinds the sheet-like material 2 from the raw material roll 1 wound into a roll shape, and a conveyor roller 4 that transports the sheet-like material 2 and winds the sheet-like material 2 as a predetermined product. It has a structure including a roll winding section 6 that winds up the roll 5. Generally, the unwinding section includes a brake 7 for applying an appropriate unwinding tension to the unwinding sheet material, and the roll winding section 6 winds up the sheet material 2 and applies the appropriate winding tension. A winding drive source 8 (for example, a hydraulic motor, a direct current motor, or a combination thereof with a slip clutch) is provided for controlling the winding value.

In controlling the winding tension in this O-ru winding section 6, conventionally, in order to wind the winding roll 5 in a good winding form without any defects, as shown in FIG. A method is known in which the winding tension is gradually reduced as the diameter increases (for example, Japanese Patent Publication No. 52-25919, Japanese Patent Application Laid-open No. 1983
-24666), the winding tension at the beginning of winding is the highest,
By gradually decreasing the winding tension as the diameter of the winding roll 5 increases, the residual stress inside the winding layer of the winding roll 5 can be appropriately suppressed, preventing distortion of the winding roll and eliminating defects. It is possible to obtain a good winding appearance that prevents the occurrence of.

Conventionally, in the sheet-like material winding device as described above, the unwinding tension of the unwinding sheet-like material 2 in the unwinding section 3 is usually controlled to a constant value. That is, the sheet-like material 2 is rewound with a constant unwinding tension, the sheet-like material 2 is sent to the roll winding section 6 at an appropriate speed (for example, at a constant speed) by the conveying roller 4, and then This is a method of winding up the sheet-like material 2 by controlling the winding tension to gradually decrease. As a method of controlling the unwinding tension to a constant value, there is a general method of feeding back a detection signal from the dancer roller mechanism 9 that detects the winding tension to the brake 7, and a method of controlling the brake 7 while detecting the diameter of the material roll 1. Control method (for example, Japanese Patent Laid-Open No. 51
10264), a method of controlling the load on the dancer roll so that the tension in the dancer roller mechanism 9 becomes a constant value (for example, the method disclosed in Japanese Patent Application Laid-Open No. 116564/1983).
Various methods are known, such as the method shown in Japanese Patent Publication No.

[Problems to be Solved by the Invention] However, the method of controlling the unwinding tension to a constant value and controlling the winding tension to gradually decrease as the diameter of the winding roll increases has the following problems. There is.

Considering the tension state of the sheet-like material 2 from the unwinding section 3 to the roll winding section 6 during steady winding, the unwinding tension at the unwinding section 3, the winding tension at the roll winding section 6, and the conveyance roller The delivery tension at 4 is kept in balance. The feed-off tension on the conveyance roller 4 is obtained by the frictional force between the surface of the conveyance roller 4 and the sheet-like material 2 wound around it, and when the winding tension is smaller than the unwinding tension, the sheet-like material 2 It acts as a sending tension that actively sends out the object 2 from the unwinding section 3 to the pull-out roll winding section 6, and when the winding tension is greater than the unwinding tension, a brake is applied to the roll winding section 6. It acts on the side.

That is, as shown in FIG. 5, when the unwinding tension 10 is controlled to a constant tension at a value that is approximately equal to or slightly higher than the initial value of the winding tension 11, the sheet is A feeding tension acts on the material 2, and when the unwinding tension 10 is set lower than the initial value of the winding tension 11 as shown in FIG. It acts as a tension force, and in BIN it acts as a delivery tension force.

However, since the unwinding tension is controlled to a constant value and the winding tension is controlled to gradually decrease, the difference between the winding tension and the unwinding tension changes depending on the diameter of the winding roll 5. If this difference exceeds the maximum value of the tension obtained by the frictional force between the conveying roller 54 and the sheet-like material 2 in the conveying roller 54 section, the tension balance will no longer be maintained, and the tension between the conveying roller 4 and the sheet-like material 2 will be reduced. There will be slippage between the two. In particular, during high-speed winding, an accompanying air current is caught between the conveyance roller 54 and the sheet-like object 2, so that the frictional force Fj that can hold the sheet-like object 2 on the surface of the conveyance roller 4 decreases. The maximum value of the tension that can be generated in the roller 4 portion decreases), and the difference between the winding tension and the unwinding tension described above cannot be ignored.

The relationship between this tension difference and the slippage on the conveyance rollers 4 varies depending on the wrapping angle of the sheet-like object 2 around each conveyance roller 4, the materials of the sheet-like object 2 and the conveyance roller 4, and the surface condition.
Generally, the winding tension is 70% or less or 130% of the unwinding tension.
If this is the case, slippage will easily occur between the sheet-like material 2 and the conveying roller 4. If slipping occurs, the sheet-like material 2
There is a problem that scratches may occur on the surface of the product, causing product defects.

Furthermore, even in a state where no slippage occurs, if the unwinding tension is significantly higher than the winding tension, an unnecessarily high braking amount is applied to the brake 7, and the driving force of the conveying roller 4 is reduced by the braking amount. This means that a large amount of power is provided to compensate for the difference between the winding tension and the winding tension.

Therefore, the drive source of the conveyance roller 4 is forced to do extra work, and when this is combined with the unnecessarily large braking energy of the brake 7, there is a problem that the sheet-like material 2 must be wound up while causing a large energy loss. There is also.

In order to solve the problem caused by controlling the unwinding tension to a constant value as described above, the present invention appropriately balances the unwinding tension with the winding tension from the beginning of winding to the end of winding, thereby eliminating unnecessary winding tension. The object of the present invention is to prevent a large tension difference from occurring, thereby preventing the sheet-like material from slipping on the conveying roller portion and from causing a large energy loss in the winding device.

[Means for Solving the Problems] A sheet-like material winding device of the present invention that meets this purpose has an unwinding section that unwinds a sheet-like material that has been wound into a roll, and a winding unit that unwinds a sheet-like material that has been rewound into a roll shape. a roll winding section that winds up the material into a roll and gradually reduces the winding tension as the diameter of the winding roll increases; In a sheet-like material winding device comprising: a conveying roller that transports the material to a roll winding section; It is characterized by being equipped with an unwinding tension control device that gradually reduces the unwinding tension as the diameter of the take-up roll increases.

In the unwinding tension control in this unwinding tension control device, the unwinding tension may be controlled independently of the winding tension from the increase signal of the diameter of the winding roll, and the winding tension may be controlled independently of the winding tension. The tension is preset to gradually decrease as the roll diameter increases! The unwinding tension may be controlled using the JIa pattern.

[Operation] In such a sheet-like material winding device, the unwinding tension is controlled to increase or decrease in the same way as the winding tension as the diameter of the winding roll increases. increase in
The difference between the winding tension and the unwinding tension at the conveying roller portion is maintained at a substantially constant and appropriately small value without being affected by the gradual decrease in the winding tension. Therefore, even if this tension difference causes an accompanying air current to be drawn between the conveyance roller and the sheet-like object, and slippage is likely to occur therebetween, the slippage can be easily prevented.

In addition, since the difference between the unwinding tension and the winding tension is kept small, the driving energy of the conveyance roller between the unwinding section and the roll winding section can be kept to the minimum necessary. Since it is gradually reduced in accordance with the gradual decrease, there is no need to keep the unwinding brake amount unnecessarily large, so that the energy loss of the entire winding device can be suppressed to the necessary minimum.

[Embodiment] A preferred embodiment of the sheet-like material winding device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sheet-like material winding device according to an embodiment of the present invention applied to a sheet-like material slitter, and FIG. 2 shows the control of the winding tension and unwinding tension. The block diagram is shown. In the figure, 21 indicates a raw fabric roll which is a sheet-like material wound into a roll shape, and the raw fabric roll 21
is attached to the unwinding section 22. An unwinding tension is applied to the sheet-like material 23 unwound from the original roll 21 by a brake 24 (for example, a powder brake, a DC motor, etc.) provided in the unwinding section 22 . Fluctuations in the unwinding tension are absorbed by the swingably supported dancer roll 25, and the unwinding tension is detected via an appropriate tension detection means 26, so that the detected tension matches the command value. Brake 24 is controlled.

The sheet material 23 that has passed through the dancer rolls is transported to a roll winding section 29 by transport rollers 28, which are arranged in an appropriate number and whose speed is controlled by a suitable drive means 27 (for example, a DC motor, a hydraulic motor, etc.). Ru. In this embodiment, the conveyance roller 28a is a grooved roller, and the sheet-like material 23 is cut by the cutter 30 inserted into the groove at an appropriate pitch.
is cut into strips, and the sheet-like material 23 cut into strips is sent to a roll winding section 29.

In the roll winding section 29, the belt-shaped sheet material 23 is pressed against a contact pressure roll 31 and wound onto a winding roll 32 as a product while being applied with an appropriate surface pressure. The take-up roll 32 is rotationally driven by a suitable take-up drive means 34 (for example, a DC motor, a hydraulic motor, or a combination thereof with a slipping clutch) attached to the take-up arm 33.

In this drive, the winding drive torque is controlled so that the winding tension becomes a predetermined value.

In this embodiment, the winding tension is determined by the initial tension setting, that is, the setting of the absolute value of the tension per unit width of the sheet material, as shown in FIG. 2.
5. A winding tension command 39 is calculated based on a tension ratio pattern 37 that is preset to change the winding tension according to a signal 36 of the winding diameter of the winding roll 32 and a signal 38 of the width of the product to be wound. The winding tension is controlled by the winding tension operation section 40 so that the command value is achieved. The winding tension command 39 is calculated using the following equation.

Winding tension command (kg) - Initial tension setting (kg/l) x
In the product (1) x tension ratio pattern value (%) / 1 Also, the winding diameter 36 is calculated from the rotation speed of the winding roll 32 and the conveyance speed of the sheet-like material, or the winding length and the thickness of the sheet-like material, etc. be done.

Then, as shown in FIG. 3, the tension ratio pattern value corresponding to the calculated winding diameter 36 is used in the above equation. As a result, the winding tension is controlled to gradually decrease as the winding diameter of the winding roll 32 increases.

On the other hand, in this embodiment, the unwinding tension is determined by calculating the unwinding tension command 42 using the initial tension setting 35 on the winding side, the tension ratio pattern 37, and the width signal 41 of the original fabric roll 21, and then calculating the unwinding tension command 42. It is controlled by the unwinding tension operation section 43 so that the tension becomes as follows. That is, the raw unwinding tension is detected in the dancer roll 25 section, and the brake amount of the brake 24 of the unwinding part 22 is controlled so that the unwinding tension command 42 and the raw unwinding tension match. In the slitter, the unwound original sheet is slit into several strips and wound up, and the total width of the rolled product including the re-winding portion is equal to the width of the original sheet. That is, by multiplying the width of the original fabric roll 21 by the winding tension setting and the tension ratio pattern, an unwinding tension that matches the sum of the winding tensions can be obtained.

In addition, when the appropriate values of the unwinding tension and the winding tension are different, such as when the raw fabric roll 21 has wrinkles or the like and the unwinding tension needs to be controlled to be slightly higher than the winding tension. In this case, an appropriate difference or ratio is set using the unwinding tension correction amount setting 44.
It can be set between the winding tension and the unwinding tension. With such a control system, the unwinding tension is controlled to gradually decrease as the diameter of the winding roll 32 increases, in the same or similar pattern as the winding tension.

In the embodiment apparatus configured as described above, the winding tension is controlled to gradually decrease as the diameter of the winding roll 32 increases so as to obtain a good product winding appearance.
Like the winding tension, the unwinding tension is also controlled to gradually decrease as the diameter of the winding roll 32 increases. Therefore, the difference between the unwinding tension and the total winding tension is almost negligible or kept at an appropriately small value from the beginning of winding to the end of winding of the winding roll 32. Therefore, the tension difference between the winding side and the unwinding side of the conveying roller 28 portion is kept small,
This tension difference is easily absorbed by the frictional force between the conveyance roller 28 and the sheet-like material 23. That is, as described above, when the winding tension is 70% or less or 130% or more of the unwinding tension, the sheet-like material 23 tends to slip on the surface of the conveying roller 28, but by controlling the unwinding tension to gradually decrease, the unwinding tension can be reduced. The difference between the winding tension and the winding tension is reliably kept within a range in which slippage does not occur. In addition, in order to prevent this slipping even more reliably,
It is desirable to maintain the unwinding tension in the range of 80% to 120% of the winding tension.

Further, since the unwinding tension is controlled to gradually decrease, it is not necessary to keep the brake amount of the brake 24 of the unwinding section 22 unnecessarily high from the beginning to the end of winding, and energy loss is reduced accordingly. In addition, when the unwinding tension is controlled to a higher value than the winding tension, the drive source of the transport roller 28 includes the unwinding tension and the winding tension in addition to the power required to rotate the transport roller 28. However, since the difference between the unwinding tension and the winding tension is always controlled to be small, the driving energy of the conveying roller 28 is kept to the minimum necessary, and energy loss is reduced. Reduced.

Note that in this embodiment, the command values for the winding tension and unwinding tension are calculated using a common tension ratio pattern and tension setting, but the command values for the winding tension and unwinding tension are not limited to this. may be calculated and controlled individually using different tension ratio patterns or different tension settings. Of course, it goes without saying that the tension ratio pattern may not be a curved line but may be a linear pattern that gradually decreases.

[Effects of the Invention] As explained above, when using the sheet-like material winding device of the present invention, (a) the conveying roller It is possible to eliminate the tension imbalance between the unwinding tension and the winding tension on the surface, and it is possible to prevent the occurrence of slippage between the conveyance roller surface and the sheet material due to the tension difference, and to prevent the occurrence of product defects such as scratches. The effect is that a high-quality product can be obtained.

(b) In addition, by balancing the unwinding tension and the winding tension, it is possible to save the drive energy of the transport roll system and the braking energy of the unwinding section, resulting in energy savings by using the minimum necessary energy. It also has the effect of being able to be measured.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a sheet-like material winding device according to an embodiment of the present invention, FIG. 2 is a block diagram of I control of winding tension and unwinding tension of the device of FIG. 1, and FIG. is a diagram showing the relationship between the winding diameter and tension ratio of the tension ratio pattern in the control shown in Figure 2, Figure 4 is a schematic configuration diagram showing the general structure of a conventional slitter, and Figure 5 is a diagram showing the conventional winding tension and winding. A control characteristic diagram of the unwinding tension. FIG. 6 is another control characteristic diagram of the conventional winding tension and unwinding tension. 21... Original fabric roll 22... Unwinding section 23... Sheet material 24... Brake 25... Dancer roll 26... ... Tension detection means 27 ... Drive means 28 ... Conveyance roller 29 ... Roll winding section 30 ... Cutter 31 ...・Contact pressure roll 32...Take-up roll 33...Take-up arm 34...Take-up drive means 35...Initial tension setting 36... ... Winding diameter signal 37 ... Tension ratio pattern 38 ... Winding tension command 41 ... Original fabric roll width signal 42 ... Unwinding tension command 44・・・・・・Unwinding tension correction amount setting Figure 3 Figure 4 Figure 5 Envy Figure 6 Winding diameter

Claims (1)

[Claims] (1) An unwinding section that unwinds the sheet material wound into a roll, and winds up the unwound sheet material into a roll shape and gradually reduces the winding tension as the diameter of the winding roll increases. In a sheet-like material winding device comprising a roll-winding section, and a conveyance roller located between an unwinding section and a roll-winding section and transporting a sheet-like material from the unwinding section to the roll winding section. , characterized in that the winding device is provided with an unwinding tension control device that gradually reduces the unwinding tension of the sheet-like material unwound from the unwinding section in accordance with an increase in the diameter of the winding roll. Winding device for sheet materials.