winding device

Abstract

To provide a winding device of a simple structure capable of constantly applying adequate tension to a product sheet during winding without bending the product sheet.SOLUTION: A winding device 1 for winding a product sheet 5 is provided with: a winding-off part 10 for winding off the product sheet 5; a winding part 20 for winding the product sheet 5; and a tension control part 30 positioned in the middle of the winding-off part 10 and the winding part 20 and controlling the tension of the product sheet 5, wherein, a winding-off portion of the product sheet 5 in the winding-off part 10, a winding portion of the product sheet 5 in the winding part 20, and a tension applying part to the product sheet 5 in the tension control part 30 are aligned on a line in a side view.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a winding device that performs appropriate tension control without bending a product sheet.

Background Art

[0002] A winding device is a device that winds up a continuous sheet-like long roll (hereinafter referred to as a product sheet) such as paper, film, or metal foil neatly while rewinding it. In a winding device, in order to wind up a product sheet neatly, it is necessary to always keep the product sheet taut so that it does not sag during winding, that is, to always maintain the tension of the product sheet in an appropriate state during winding.

[0003] If the tension of the product sheet is too strong, the product sheet will shrink or break, and if the tension is weak, wrinkles will form on the product sheet, and the product sheet cannot be wound up neatly. Therefore, while winding up the product sheet to apply a certain tension to the product sheet, a brake is applied to the feed speed of the product sheet in the middle of the unwinding and winding lines, and there is a winding device that winds up the product sheet in a taut state (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In such a device, in order to apply tension to the product sheet and keep it taut, a plurality of rollers are arranged in an S shape, and the product sheet is moved along the plurality of rollers to apply tension to the product sheet.

[0006] In this case, the S-shaped arrangement of multiple rollers allows for stronger tension to be applied to the product sheet as the bending curvature of the product sheet decreases. However, depending on the material of the product sheet, there were challenges such as the product sheet itself not being allowed to be bent, or the product sheet being damaged when bent to a small degree of curvature.

[0007] This invention has been made in view of these problems, and aims to provide a winding device that can apply appropriate tension to a product sheet at all times during winding, with a simple configuration, without bending the product sheet. [Means for solving the problem]

[0008] The present invention has been made to solve at least some of the above-mentioned problems and can be realized in the following application examples. The reference numerals and supplementary explanations in parentheses in this section are provided to aid in understanding the present invention and correspond to the embodiments described later; they do not limit the present invention in any way.

[0009] [Application Example 1] The winding device (1) described in Application Example 1 is A winding device (1) for winding up a product sheet (5), The unwinding section (10) unwinds the product sheet (5), A winding unit (20) for winding up the product sheet (5), A tension control unit (30) is located between the unwinding unit (10) and the winding unit (20) and controls the tension of the product sheet (5), Equipped with, The gist of this invention is that the unwinding portion of the product sheet (5) of the unwinding portion (10), the winding portion of the product sheet (5) of the winding portion (20), and the tension-applying portion of the tension control unit (30) to the product sheet (5) are arranged in a straight line when the product sheet (5) is viewed from the side.

[0010] In such a winding device (1), the unwinding portion of the unwinding section (10) on which the product sheet (5) is wound, the winding portion of the winding section (20) that winds the product sheet (5), and the portion of the tension control unit (30) that is located between the unwinding section (10) and the winding section (20) and applies tension to the product sheet (5) are arranged in a straight line when the product sheet (5) is viewed from the side.

[0011] As a result, the tension control unit (30) positioned in front of the winding unit (20) applies tension to the product sheet (5), keeping the product sheet (5) taut at all times during winding, thus enabling the product sheet (5) to be wound neatly.

[0012] Furthermore, since there is no need to bend the product sheet (5) with a small curvature, it is possible to apply appropriate tension to the product sheet while winding it up, even if bending the tension application area is not permitted. In addition, damage to the product sheet (5) due to bending can be prevented.

[0013] [Application Example 2] The winding device (1) described in Application Example 2 is the same as the winding device (1) described in Application Example 1, The tension control unit (30) is, A drive roll (31) that contacts one surface of the moving product sheet (5), A nip roll (32) is positioned opposite the drive roll (31) and presses the product sheet (5) against the drive roll (31) from the other side, Equipped with, The gist of the invention is that it includes a torque control unit (40) that controls the torque when the drive roll (31) is driven to rotate.

[0014] In such a winding device (1), in order to apply tension to the product sheet (5), the product sheet (5) is held with appropriate pressure by the drive roll (31) and the nip roll (32), and the torque when rotating the drive roll (31) is controlled.

[0015] As a result, it is possible to impart appropriate resistance to the conveyance of the product sheet (5), and it is possible to impart appropriate tension to the product sheet (5) before the product sheet (5) is wound up by the winding unit (20).

[0016] [Application Example 3] The winding device described in Application Example 3 is the winding device (1) described in Application Example 2, wherein the torque control unit (40) is characterized by including an air clutch for performing torque control of the drive roll (31).

[0017] In such a winding device (1), by using an air clutch to perform torque control during the rotational drive of the drive roll (31), the configuration of the winding device (1) becomes simple, and appropriate torque control is possible even when the line speed is high. [Brief Description of the Drawings]

[0018] [Figure 1] It is a diagram showing a schematic configuration of the winding device in the first embodiment. [Figure 2] It is a block diagram showing a schematic functional configuration of the winding device. [Figure 3] It is a diagram showing a schematic configuration of the torque control unit. [Figure 4] It is a diagram showing a schematic configuration of the winding device in the second embodiment. [Modes for Carrying Out the Invention]

[0019] Hereinafter, embodiments to which the present invention is applied will be described with reference to the drawings. Note that the embodiments of the present invention are not limited to the following embodiments, and can take various forms as long as they belong to the technical scope of the present invention.

[0020] [First Embodiment] The configuration of the winding device 1 will be described based on Figures 1 and 2. Figure 1 is a diagram showing the schematic configuration of the winding device 1 in the first embodiment, and Figure 2 is a block diagram showing the schematic functional configuration of the winding device 1. Figure 3 is a diagram showing the schematic configuration of the torque control unit 40.

[0021] As shown in Figures 1 and 2, the winding device 1 comprises an unwinding unit 10, a winding unit 20, a tension control unit 30, and a system control unit 50 (see Figure 2).

[0022] The unwinding section 10 is the part that unwinds the product sheet 5 wound around a rotating shaft (not shown), and is the part that rotatably supports the rotating shaft of the product sheet 5.

[0023] The winding section 20 is the part that winds the product sheet 5 onto a rotating shaft (not shown). The winding section 20 is equipped with a winding motor 21, and by driving the winding motor 21 at a constant rotational speed, the product sheet 5 is wound up at a constant speed.

[0024] The tension control unit 30 is installed approximately midway between the unwinding unit 10 and the winding unit 20 in the direction of movement (winding direction) of the product sheet 5. Furthermore, the part of the tension control unit 30 that applies tension to the product sheet 5 is positioned such that, when the product sheet 5 being wound is viewed from the side, it is almost in a straight line with respect to the unwinding portion of the product sheet 5 in the unwinding unit 10 and the winding portion of the product sheet 5 in the winding unit 20.

[0025] The tension control unit 30 includes a drive roll 31, a nip roll 32, and a torque control unit 40. The drive roll 31 and nip roll 32 are cylindrical members with a surface made of resin or metal, and are installed opposite each other on the top and bottom (front and back sides) of the product sheet 5 so as to sandwich the product sheet 5 from above and below (front and back sides).

[0026] The radius of the drive roll 31 is r. Furthermore, the nip roll 32 is pressed against the drive roll 31 by a biasing device such as a spring or air cylinder (not shown), thereby sandwiching the product sheet 5 between the drive roll 31 and the nip roll 32.

[0027] The torque control unit 40 is connected to the rotation axis of the drive roll 31 and controls the rotational torque of the drive roll 31. Now, the configuration of the torque control unit 40 will be explained based on Figure 3. Figure 3 is a diagram showing the schematic configuration of the torque control unit 40.

[0028] As shown in Figure 3, the torque control unit 40 includes a coupling 41, a torque sensor 42, a clutch 43, a reduction gear 44, a rotary joint 45, and a torque motor 46. The coupling 41 is a component that connects the rotation shaft of the drive roll 31 to the torque control unit 40.

[0029] The torque sensor 42 is a sensor that measures the torque applied to the drive roll 31, which is connected via the coupling 41. The clutch 43 is a part that generates slip when transmitting the rotational motion generated by the torque motor 46 and the reduction gear 44 to the drive roll 31, and controls the torque value applied to the drive roll 31. In this embodiment, an air clutch is used.

[0030] The reduction gear 44 is composed of multiple gears (not shown) and is the part that changes the direction of rotation of the rotational motion generated by the torque motor 46 by 90° and reduces the rotational speed of the rotational shaft of the torque motor 46.

[0031] The rotary joint 45 is a joint member for supplying air to the clutch 43, which is an air clutch, and is designed to allow air to be supplied from the outside while the clutch 43 is rotating. The torque motor 46 is an electric motor that rotates the drive roller 31, and its rotational speed is controlled by the system control unit 50, which will be described later.

[0032] As shown in Figure 2, the system control unit 50 includes a CPU, ROM, RAM, I / O, and storage unit (not shown), and is connected via I / O to the winding motor 21 of the winding unit 20, and the torque sensor 42, clutch 43, and torque motor 46 of the torque control unit 40.

[0033] The system control unit 50 performs the following controls (a) to (e) using programs stored in the ROM or memory unit. (a) The winding motor 21 is activated to wind the product sheet 5 from the unwinding section 10 to the winding section 20.

[0034] (i) The torque T applied to the drive roll 31 is measured from the torque sensor 42. (c) From the measured torque T and the radius r of the drive roll 31, the tension F = r × T applied to the product sheet 5 during winding is calculated.

[0035] (e) The amount of air supplied to the clutch 43 (air clutch) is controlled so that the calculated tension F becomes a predetermined value. (O)(A) By performing (B) to (D) in succession while winding the product sheet 5 in the (O)(A) section, the product sheet 5 is wound while a predetermined tension is applied.

[0036] (Features of winding device 1) In this type of winding device 1, the product sheet 5 is unwound from the unwinding section 10 and then wound onto the winding section 20 while being sandwiched between the drive roll 31 and the nip roll 32.

[0037] Then, in order to maintain the proper tension on the product sheet 5 as it is unwound and transported from the unwinding section 10, the rotational driving force of the drive roll 31 is torque-controlled in accordance with the tension of the product sheet 5 in the preceding section of the winding section 20. As a result, appropriate braking is applied to the transport of the product sheet 5, and appropriate tension is applied to the product sheet 5 when it is wound up in the winding section 20.

[0038] Here, the unwinding section 10, drive roll 31, nip roll 32, and winding section 20 are installed so that when the product sheet 5 is viewed from the side, the product sheet 5 is transported in a straight line. Therefore, the product sheet 5 can be wound up without bending, and product sheets 5 that cannot be bent can be wound up, or product sheets 5 that are fragile to bend can be wound up without being damaged.

[0039] [Second Embodiment] Next, the winding device 2 in the second embodiment will be described based on Figure 4. Figure 4 is a diagram showing the schematic configuration of the winding device 2 in the second embodiment. Since the winding device 2 in the second embodiment is similar to the winding device 1 in the first embodiment, the same reference numerals are used for the same components, and their descriptions are omitted.

[0040] In the second embodiment, the winding device 2 is equipped with two tension control units 30 as in the first embodiment. That is, two tension control units 30 are positioned between the unwinding unit 10 and the winding unit 20.

[0041] In this type of winding device 2, the two tension control units 30 make it possible to stably apply a constant tension to the product sheet 5 during winding, allowing the product sheet 5 to be wound more neatly.

[0042] Furthermore, by controlling the tension so that the difference in tension applied by each of the two tension control units 30 remains constant, a stable tension can be applied to the product sheet 5 between the two tension control units 30 and the sheet can be wound up.

[0043] (Other embodiments) (1) In the above-described embodiment, an air clutch is used as the clutch 43 for torque control of the drive roll 31, but other types of clutches such as a powder clutch may be used. (2) Alternatively, the rotational torque of the torque motor 46 may be controlled directly without using the clutch 43. [Explanation of Symbols]

[0044] 1...Winding device, 5...Product sheet, 10...Unwinding unit, 20...Winding unit, 21...Winding motor, 30...Tension control unit, 31...Drive roll, 32...Nip roll, 33...Second drive roll, 40...Torque control unit, 41...Coupling, 42...Torque sensor, 43...Clutch, 44...Reducer, 45...Rotary joint, 46...Torque motor, 50...System control unit.

Claims

[Claim 1] A winding device for winding up product sheets, The unwinding section for unwinding the aforementioned product sheet, A winding unit for winding up the aforementioned product sheet, A tension control unit is located between the unwinding section and the winding section and controls the winding tension of the product sheet being wound into the winding section. Equipped with, The tension control unit, A drive roll that contacts the surface of the moving product sheet, A nip roll is positioned opposite the drive roll and presses the product sheet against the drive roll, Equipped with, Furthermore, it includes a torque control unit that controls the torque when the drive roll is rotated, The torque control unit comprises a sensor for measuring the torque, and an air clutch that controls the torque of the drive roll so that the winding tension becomes a predetermined value based on the measured torque. A winding device characterized in that the unwinding portion of the product sheet in the unwinding section, the winding portion of the product sheet in the winding section, and the tension-applying portion of the tension control unit to the product sheet are arranged in a straight line when the product sheet is viewed from the side.

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