Sheet supplying apparatus and supplying method for sheet thereby

Abstract

A sheet supply device is provided that continuously supplies sheets by connecting the leading end of a sheet of a waiting roll to the rear end of a sheet being unwound from a work roll using an auto splicer, and a fixed chuck is provided to fix both ends of a core forming the central axis of the work roll and the waiting roll so that the work roll and the waiting roll can be rotatably mounted respectively, thereby allowing the unwinding of the sheet, and a turret unwinder that switches the positions of the waiting roll and the work roll when the sheet of the work roll is exhausted; a sensing unit that detects the position of one end of the axial end of the waiting roll mounted on the turret unwinder; a correction unit connected to the fixed chuck constituting the turret unwinder that corrects the position of the waiting roll while moving the fixed chuck in the axial direction; and a control unit that controls the operation of the correction unit based on the position information of the waiting roll detected by the sensing unit to correct the position of the waiting roll and align the end of the waiting roll so that it forms a line with the end of the work roll.

Description

Technology Field

[0001] The embodiments disclosed in this specification relate to a sheet supply device and a sheet supply method using the same, and more specifically, to a sheet supply device and method capable of continuously supplying a sheet by connecting the leading end of a sheet wound on a standby roll to the trailing end of a sheet unwound from a work roll using an auto splicer. Background Technology

[0003] Generally, solar modules consist of an EVA sheet, solar cells, glass, and a frame, in that order.

[0004] Here, the EVA (Ethyl Vinyl Acetate) sheet performs the function of protecting the solar cell from external environments such as moisture penetration, and serves an essential function to maintain the lifespan of the solar cell, which is typically used for 20 to 30 years.

[0005] Specifically, the EVA sheet is positioned on the front and back of the solar cell to act as a cushioning material that prevents damage to the solar cell, and performs the function of bonding and encapsulating the front glass and the back sheet on the back.

[0006] Since these EVA sheets must maintain their adhesive strength and not degrade in performance even after long-term use, they must be manufactured precisely and bonded to solar modules.

[0007] These EVA sheets for solar modules are continuously produced and supplied wound on rolls; at the manufacturing site, they are cut to a set size suitable for the solar modules and laminated onto the front glass.

[0008] To this end, EVA sheets for solar modules are supplied continuously using a roll-to-roll method.

[0009] Specifically, the EVA sheet is unwound and cut while wound on a work roll, and when the work sheet is exhausted, it is continuously supplied by joining the rear end of the work sheet to the front end of the standby sheet wound on a standby roll.

[0010] Previously, to continuously join sheets, a worker manually applied double-sided tape to the work sheets and then manually moved a waiting roll to join two sheets; however, this method was inefficient due to the increased time required for manual operation and the fact that the two sheets were not accurately connected.

[0011] Furthermore, with the recent rise in unmanned automation where rolls are automatically supplied by AMRs (Autonomous Mobile Robots), the importance of accurately connecting two sheets has increased.

[0012] Accordingly, recently, sheets are being connected by applying technology that automatically connects the sheets of two rolls, such as the auto splicing device of a roll-to-roll feeding facility disclosed in Registered Patent Publication No. 10-2474343.

[0013] The prior art described above is an auto-splicing technology that automatically joins the first supply roll by attaching a tape to the waiting second supply roll when the sheet being unwound from the first supply roll is exhausted.

[0014] At this time, for auto-splicing, the second supply roll must be aligned so that the ends of the sheet of the first supply roll and the sheet of the second supply roll coincide; if not aligned, there is a problem where material slippage occurs at the joint due to deviation in the sheets.

[0015] As described above, if material slippage occurs, the sheets of the second supply roll are stacked in a state where they are shifted by the deviation during the stacking process after being cut, resulting in product defects.

[0016] In addition, the prior art has a problem in that if the sheet wound on the second supply roll is wound in an inclined state during the process of winding onto the roll and becomes oblique during unwinding, the sheet on the second supply roll is cut in an inclined state, which further exacerbates the defect.

[0017] Therefore, technology was needed to solve the aforementioned problems.

[0018] Meanwhile, the aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot be considered as prior art disclosed to the general public prior to the filing of the present invention. The problem to be solved

[0020] The embodiments disclosed in this specification aim to provide a sheet supply device and method capable of connecting the leading end of a sheet wound on a waiting roll to the rear end of a sheet being unwound from a work roll using an auto splicer, detecting one end of the axial ends of only the waiting roll, and aligning and correcting the one end of the waiting roll to match the end position of the work roll.

[0021] In addition, the embodiments disclosed in this specification aim to provide a sheet supply device and method capable of adjusting the position of a standby roll by accurately moving the mechanical chuck, wherein the fixed chuck that fixes the end of the standby roll is configured as a mechanical chuck capable of moving in the axial direction, through the configuration of a servo motor.

[0022] Furthermore, the embodiments disclosed in this specification aim to provide a sheet supply device and method capable of accurately detecting and providing the position of the axial end of a standby roll, and additionally correcting the sheet's meandering by detecting the edge of the sheet being unwound from the work roll after the standby roll is switched to the position of the work roll and correcting the position of the work roll.

[0023] In addition, the embodiments disclosed in this specification aim to provide a sheet feeding device and method capable of correcting the angle of a sheet being unwound from a work roll by moving the turret unwinder through a member that movably supports the lower part of the turret unwinder.

[0024] In addition, the embodiments disclosed in this specification are intended to provide a sheet supply device and method capable of smoothly separating a sheet-exhausted paper tube from a fixed chuck. means of solving the problem

[0026] A sheet supply device according to one embodiment as a technical means for achieving the aforementioned technical problem is a sheet supply device that continuously supplies a sheet by connecting the front end of a sheet of a waiting roll to the rear end of a sheet being unwound from a work roll with an auto splicer, wherein the work roll and the waiting roll are each rotatably mounted with a fixed chuck that fixes both ends of a core forming the central axis of the work roll and the waiting roll, thereby allowing the unwinding of the sheet, and a turret unwinder that switches the positions of the waiting roll and the work roll when the sheet of the work roll is exhausted; a sensing unit that detects the position of at least one end of the axial end of the waiting roll mounted on the turret unwinder; and a correction unit connected to the fixed chuck constituting the turret unwinder and correcting the position of the waiting roll while moving the fixed chuck in the axial direction. and may include a control unit that controls the operation of the correction unit based on the position information of the waiting roll detected by the detection unit to correct the position of the waiting roll and align the end of the waiting roll so that it forms a line with the end of the work roll.

[0027] In addition, as a technical means for achieving the aforementioned technical problem, a sheet supply method performed in a sheet supply device according to one embodiment is a sheet supply method performed by a sheet supply device that continuously supplies a sheet while connecting the leading end of a sheet of a waiting roll to the rear end of a sheet being unwound from a work roll with an auto splicer, and may include the step of loading and mounting the waiting roll on a turret unwinder on which the work roll is mounted; the step of detecting the position of at least one end of the two ends of the waiting roll mounted on the turret unwinder; and the step of correcting the position of the waiting roll so that the end of the waiting roll is aligned in line with the end of the work roll based on the position information of the waiting roll detected in the detecting step. Effects of the invention

[0029] According to any one of the aforementioned means for solving the problem, a sheet supply device and method can be presented in which the work efficiency of sheet connection and the precision can be improved by connecting the leading end of a sheet wound on a waiting roll to the rear end of a sheet unwound from a work roll using an auto splicer, and aligning and correcting the axial end of the waiting roll to form a line with the axial end of the work roll.

[0030] In addition, according to any one of the aforementioned means for solving the problem, the control unit detects the axial end of only the waiting roll through the sensing unit, and by moving the fixing chuck that fixes the end of the waiting roll through the correction unit in the axial direction, the seat portion of the waiting roll can be accurately aligned and connected so as to be in line with the seat portion of the work roll.

[0031] In addition, according to any one of the aforementioned means for solving the problem, the fixed chuck that fixes the end of the waiting roll is configured as a mechanical chuck capable of moving in the axial direction, and by moving this mechanical chuck in the axial direction through the configuration of a servo motor, the end of the waiting roll can be precisely connected while aligning it in a line with the end of the work roll.

[0032] In addition, according to any one of the aforementioned means for solving the problem, the vision sensor constituting the detection unit moves through the sensor moving member, so the end of the waiting roll can be accurately detected and provided.

[0033] In addition, according to any one of the aforementioned means for solving the problem, when a sheet is unwound from a new work roll after the standby roll is switched to the position of a work roll, the control unit operates a correction unit based on the edge of the work roll sheet detected through an edge profile sensor, thereby enabling correction even if the work roll sheet meanders during the unwinding process.

[0034] In addition, according to any one of the aforementioned means for solving the problem, the control unit controls the correction unit based on the detection signal of the detection unit and simultaneously controls the operation of the EPC unit that movably supports the turret unwinder, thereby allowing the position of the work roll to be corrected more precisely and the unwinding angle of the work roll sheet to be corrected more precisely.

[0035] In addition, according to any one of the aforementioned means for solving the problem, the branch pipe clamp provided on the clamp fixing plate moves together with the clamp fixing plate and pressurizes and fixes the branch pipe, so that the fixing chuck can be smoothly separated from the branch pipe.

[0036] The effects obtainable from the disclosed embodiments are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the disclosed embodiments belong from the description below. Brief explanation of the drawing

[0038] FIG. 1 is a perspective view showing the configuration of a sheet supply device according to one embodiment. FIG. 2 is a perspective view showing a turret unwinder of a sheet supply device according to one embodiment. FIG. 3 is a block diagram showing a sheet supply device according to one embodiment. FIG. 4 is a configuration diagram showing a sensing part of a sheet supply device according to one embodiment. FIG. 5 is a configuration diagram showing a correction unit of a sheet supply device according to one embodiment. FIG. 6 is a block diagram showing a control unit of a sheet supply device according to one embodiment. FIG. 7 is a flowchart illustrating a sheet supply method according to one embodiment. Figure 8 is a diagram showing the configuration of the roll. Figure 9 is an explanatory diagram for explaining the movement of the waiting roll by the correction unit. FIG. 10 is an explanatory diagram for explaining the movement of the work roll by the correction unit. FIG. 11 is a configuration diagram showing a core tube clamp of a sheet supply device according to one embodiment. Figure 12 is a configuration diagram showing the operating state of a branch pipe clamp. Specific details for implementing the invention

[0039] Various embodiments are described in detail below with reference to the attached drawings. The embodiments described below may be implemented in various different forms. In order to explain the features of the embodiments more clearly, detailed descriptions of matters widely known to those skilled in the art to which the following embodiments belong have been omitted. Additionally, parts of the drawings unrelated to the description of the embodiments have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0040] Throughout the specification, when a configuration is described as being "connected" to another configuration, this includes not only cases where they are "directly connected," but also cases where they are "connected with another configuration in between." Furthermore, when a configuration is described as "including" another configuration, this means that, unless specifically stated otherwise, it does not exclude other configurations but may include additional configurations.

[0041] The embodiments will be described in detail below with reference to the attached drawings.

[0042] FIG. 1 is a perspective view showing the configuration of a sheet supply device according to one embodiment, FIG. 2 is a perspective view showing a turret unwinder of a sheet supply device according to one embodiment, and FIG. 3 is a block diagram showing a sheet supply device according to one embodiment. In addition, FIG. 4 is a configuration diagram showing a sensing unit of a sheet supply device according to one embodiment, FIG. 4 is a configuration diagram showing a correction unit of a sheet supply device according to one embodiment, and FIG. 6 is a block diagram showing the configuration of a control unit.

[0043] A sheet supply device (10) according to one embodiment is designed to continuously supply sheets by connecting them in a roll-to-roll manner. As shown in FIG. 1, it is a device that continuously supplies sheets by connecting the front end of a sheet wound on a waiting roll (2) to the rear end of a sheet unwound from a work roll (1) using an auto splicer not shown.

[0044] Here, the work roll (1) and the standby roll (2) may be composed of a sheet (4) supplied in a state wound around a central axis tube (3) as shown in FIG. 8. At this time, during the process of winding the sheet (4), the work roll (1) and the standby roll (2) may have different left and right protrusion lengths of the tube (3) as shown in FIG. 8 (a), and the sheet (4) may be wound in an inclined state as shown in (b).

[0045] Meanwhile, the sheet (4) forming the work roll (1) and the standby roll (2) may be composed of, for example, an EVA (Ethyl Vinyl Acetate) sheet used in solar modules, and in addition, any type of sheet connected in a roll-to-roll manner may be applied.

[0046] Specifically, a sheet supply device (10) according to one embodiment may be configured to include a turret unwinder (100), a sensing unit (200), a correction unit (300), a control unit (400), and an EPC unit (500), as shown in FIGS. 1 and FIGS. 3.

[0047] The above turret unwinder (100) can unwind the sheet of the work roll (1) while allowing rotation of the work roll (1) by rotatably connecting the work roll (1) and the standby roll (2) respectively, and when the sheet of the work roll (1) is exhausted, the position of the standby roll (2) and the work roll (1) is switched so that the sheet is connected by an auto splicer, and then the sheet can be unwinded while the standby roll (2) with the switched position performs the function of the work roll (1).

[0048] Specifically, the turret unwinder (100) may be provided with a fixed chuck (110) capable of rotatably mounting the axial ends of the work roll (1) and the standby roll (2), that is, the axial ends of the branch pipe (3) constituting the work roll (1) and the standby roll (2), respectively, on a pair of turret bodies (102) that rotate around a rotation axis (101).

[0049] This turret unwinder (100) allows the work roll (1) sheet to be joined by an auto splicer when the work roll (1) sheet is exhausted, and after the joining of the sheet is completed, the positions of the work roll (1) and the standby roll (2) are switched by the rotation of the rotation axis (101) by the control unit (400), and the work roll (2) sheet that has moved to the position of the work roll (1) is unwound and supplied, and the work roll (1) that has moved to the position of the standby roll (2) can be replaced with the work roll (1) that has been exhausted. That is, after the joining of the sheet is completed, the standby roll (2) moves to the position of the work roll (1) to perform the function of a new work roll (1), and the work roll (1) that has been exhausted can move to the position of the standby roll (2) and be replaced with a new standby roll (2).

[0050] Here, the turret unwinder (100) can be automatically loaded via an AMR (Auto Mobile Robot) system with the waiting roll (2) loaded on the trolley (5) as shown in FIGS. 1 and 2, and mounted on the fixed chuck (110).

[0051] Meanwhile, the fixed chuck (110) may be configured as a mechanical chuck that is installed to be movable in the axial direction while fixing each end of the axial direction of the waiting roll (2) and the work roll (1), that is, the axial end of the branch pipe (3).

[0052] This fixed chuck (110) can be installed on the turret body (102) constituting the turret unwinder (100) and can be installed to be movable in the axial direction of the waiting roll (2) and the working roll (1), and the ends of the shaft connected to the branch pipe forming the central axis of the waiting roll (2) and the working roll (1) can be fixed through a plurality of jaw opening or closing structures.

[0053] Additionally, the fixed chuck (110) can fix the waiting roll (2) and the work roll (1) while operating automatically, or it can fix the waiting roll (2) and the work roll (1) while operating manually by an operator.

[0054] The above-mentioned sensing unit (200) is configured to align the sheet of the waiting roll (2) and the sheet (4) of the work roll (1) in a line by detecting the position of the axial end of the waiting roll (2) mounted on the turret unwinder (100) and providing it to the control unit (400), and additionally performs detection to detect the oblique movement of the sheet (4) being unwound from the work roll (1).

[0055] Specifically, the sensing unit (200) can perform the following functions.

[0056] First, the sensing unit (200) can perform the function of detecting the position of the axial end (2b) of the roll portion (2a) of the sheet forming the waiting roll (2) as shown in FIG. 9 and providing it to the control unit (400) so that the correction unit (300), described later, can correct the position of the waiting roll (2) so that the sheet of the waiting roll (2) and the sheet of the working roll (1) are aligned with each other during the process of connecting the sheets of the waiting roll (2) and the working roll (1) through the auto splicer.

[0057] Second, the detection unit (200) can perform the function of detecting the axial end position of the branch tube (3) constituting the waiting roll (2) and providing it to the control unit (400) so that the position of the fixing chuck (110) can be corrected with respect to the position of the branch tube (3) constituting the waiting roll (2) during the process of loading the waiting roll (2) onto the turret unwinder (100) and mounting it on the fixing chuck (110).

[0058] Third, the sensing unit (200) can perform the function of detecting a change in the position of the sheet (4) being unwound from the roll portion (1a) of the work roll (1) and providing it to the control unit (400) so that the position of the work roll (1) can be corrected through the correction unit (300) described later, in order to provide the change in position of the sheet (4) being unwound from the roll portion (1a) of the work roll (1) to the control unit (400) in the process of unwinding the sheet (4) from the work roll (1) as shown in FIG. 10, when the sheet (4) is not unwound in a straight line and moves gradually in the opposite direction of the fixed chuck (110) or in the direction of the fixed chuck (110) as it moves away from the roll portion (1a) and meanders.

[0059] As one embodiment for performing the above-described function, the sensing unit (200) may be configured to include at least one vision sensor (220) positioned adjacent to the waiting roll (2) as shown in FIG. 1 and at least one edge profile sensor (240) positioned adjacent to the work roll (1).

[0060] In this case, the detection unit (200) can detect the position of the axial end (2b) of the roll portion (2a) forming the waiting roll (2) through the vision sensor (220) so that the sheet of the waiting roll (2) and the sheet of the working roll (1) can be aligned through the correction unit (300) described later during the process of connecting the sheet of the waiting roll (2) and the working roll (1), and can detect the edge position of the sheet (4) being unwound from the working roll (1) through the edge profile sensor (240) so that the sheet (4) being unwound from the working roll (1) can be provided to the control unit (400).

[0061] Here, the vision sensor (220) may detect the end of the tube (3) of the waiting roll (2) before mounting it to the fixed chuck (110) when loading the waiting roll (2) and mounting it to the turret unwinder (100), and transmit it to the control unit (400).

[0062] Additionally, the edge profile sensor (240) can continuously detect the edge of the sheet (4) being unwound from the work roll (1) or detect it at a set time interval and provide it to the control unit (400), thereby providing the position of the edge (4a) at the first measured point and the position of the edge (4b) at the later measured point among the detected edges. Through this, the control unit (400), which will be described later, can determine that the sheet (4) being unwound from the work roll (1) is meandering when it detects that the edge position is gradually moving in a specific direction, such as when the position of the edge (4a) at the first measured point and the position of the edge (4b) at the later measured point deviate from each other by a set deviation, and can adjust the unwinding angle of the sheet (4) by adjusting the position of the work roll (1) through the correction unit (300).

[0063] In addition, as another embodiment for performing the above-described function, the sensing unit (200) may be composed of at least one vision sensor (220) and an additional edge profile sensor (250) positioned adjacent to the waiting roll (2) as shown in FIG. 2, and an edge profile sensor (240) positioned adjacent to the work roll (1).

[0064] In this case, the detection unit (200) can detect the position of the axial end (2b) of the roll portion (2a) of the waiting roll (2) through a vision sensor (220) and an additional edge profile sensor (250) positioned adjacent to the waiting roll (2) during the process of connecting the sheets of the waiting roll (2) and the working roll (1), and can detect the end of the tube (3) before mounting the tube (3) of the waiting roll (2) to the fixed chuck (110). In addition, the change in the position of the edge can be detected by continuously detecting the edge position of the sheet (4) unwound from the working roll (1) through an edge profile sensor (240) positioned adjacent to the working roll (1).

[0065] Meanwhile, the vision sensor (220) and the edge profile sensor (240) can form a sensing unit (200) together with the sensor support (210) and the sensor moving member (230) as shown in FIG. 4.

[0066] The sensor support (210) is configured to support the vision sensor (220) or edge profile sensor (240) at a predetermined height and to position the vision sensor (210) adjacent to the turret unwinder (100).

[0067] These sensor supports (210) are formed with a plurality of bars having a predetermined length and can support a vision sensor (220) or an edge profile sensor (240) via a sensor moving member (230) described later.

[0068] Here, the sensor support (210) may be provided with casters not shown at the bottom so as to be movable, and may be configured with a telescopic structure so as to be extendable in length to allow the height of the vision sensor (220) to be adjusted.

[0069] The above sensor moving member (230) is installed on the sensor support (210) and is configured to connect the vision sensor (220) or edge profile sensor (240) with the sensor support (210), and to allow the vision sensor (220) or edge profile sensor (240) to move through control by the control unit (400).

[0070] That is, the vision sensor (220) and the edge profile sensor (240) are coupled to the sensor moving member (230) and positioned on the outer part of the waiting roll (2), and their positions can be precisely adjusted through the operation of the sensor moving member (230).

[0071] The sensor moving member (230) may be configured to include a sensor rail (231) and a sensor slider (232).

[0072] The sensor rail (231) can guide the movement path of the vision sensor (220) while installed on the sensor support (210), and the sensor slider (232) can move the vision sensor (220) by moving along the sensor rail (231) while the vision sensor (220) is fixed in a state where it is movably coupled to the sensor rail (231).

[0073] These sensor rails (231) and sensor sliders (232) are formed, for example, as linear motor structures or ball screw structures, and the vision sensor (220) can be moved through the linear movement of the sensor sliders (232).

[0074] Here, the sensor rail (231) is configured as a 1-axis structure extending in the vertical direction as shown in FIG. 4, so that the height of the vision sensor (220) or edge profile sensor (240) can be adjusted by moving the sensor slider (232) in a direction perpendicular to the tangent of the waiting roll (2), or, unlike what is shown, it may be formed as a 2-axis or 3-axis structure so that the position of the vision sensor (220) or edge profile sensor (240) can be adjusted by moving the sensor slider (232) in each axis direction.

[0075] Meanwhile, the edge profile sensor (240) may be installed on a separate support when installed adjacent to the work roll (1), and may be installed to be movable in the up, down, left, and right directions, thereby detecting and providing changes in the edge position of the sheet (4) being unwound from the work roll (1).

[0076] Here, the edge profile sensor (240) can be configured as a laser sensor or an ultrasonic sensor to detect the edge of the sheet being unwound from the work roll (1), and can detect the sheet edge of the work roll (1) through imaging, such as with the vision sensor (220).

[0077] As shown in FIG. 10, the edge profile sensor (240) can detect whether the sheet (4) of the work roll (1) is unwinding in a straight line by continuously detecting the edge of the sheet (4) being unwound from the new work roll (1) where the connection of the sheet is completed at the same set location and detecting whether the edge (4a) position of the first measured point and the edge (4b) position of the later measured point change. To this end, the edge profile sensor (240) can continuously detect the edge of the work roll (1) sheet (4) or detect it at a set time interval and provide it to the control unit (400).

[0078] Meanwhile, the vision sensor (220) can be configured as a single unit to detect the outer position of the waiting roll (2) and the end position of the branch pipe (3) of the waiting roll (2), or configured as a plurality of units so that one of the plurality detects the end position of the roll portion (2a) forming the waiting roll (2) and the other one detects the end position of the branch pipe (3) forming the waiting roll (2) and applies it to the control unit (400).

[0079] The above correction unit (300) is configured to correct the position of the waiting roll (2) while moving the aforementioned fixed chuck (110) in the axial direction, and by moving the fixed chuck (110) in the axial direction through the control of the control unit (400), the end (2b) of the roll portion (2a) forming the waiting roll (2) can be aligned with the end (1b) of the roll portion (1a) forming the work roll (1).

[0080] This correction unit (300) may be configured to include a servo motor (310) and a connecting member (320) as shown in FIG. 5.

[0081] The above servo motor (310) is connected to at least one of a pair of fixed chucks (110) that fix the standby roll (2) and can move the fixed chuck (110) in the axial direction while rotating at a rotational speed set by the control unit (400).

[0082] The connecting member (320) is a member that connects the servo motor (310) and the fixed chuck (110) and causes the fixed chuck (110) to move in a straight line along the axial direction of the standby roll (2) through the rotational movement of the servo motor (310).

[0083] As shown in FIG. 5, this connecting member (320) can move the mechanical chuck in a linear motion through the rotational movement of the servo motor (310) through the structure of the male screw (321) and the female screw (322).

[0084] Specifically, the male screw (321) is provided in the fixed chuck (110) and can move together with the fixed chuck (110).

[0085] The female screw (322) can be connected to the servo motor (310) in a screw-coupled state to the male screw (321), and the male screw (321) can be moved in a straight line while rotating forward or backward by the operation of the servo motor (310).

[0086] These female screws (322) can be screwed into a male screw (321) in a state where they are rotatably coupled to a housing (325) fixed to the turret body (102), and can be connected to a servo motor (310) through a power transmission member (326) such as a chain, belt, or gear.

[0087] That is, the female screw (322) can be linked through the power transmission member (326) when the servo motor (310) rotates, and can rotate freely in the forward or reverse direction. Accordingly, the male screw (321) can move in a straight direction by the rotation of the female screw (322) and move the fixed chuck (110) in the axial direction.

[0088] Meanwhile, the connecting member (320) may be configured such that the male screw (321) and the female screw (322) are arranged opposite to each other, as shown in FIG. 5. That is, the female screw (322) is provided on the fixed chuck (110) and can move together with the fixed chuck (110), and the male screw (321) is connected to the female screw (322) in a screw-coupled state so as to be able to idle by the servo motor (310), and by idle rotating in the forward or reverse direction, the female screw (322) can be moved in a straight direction while the fixed chuck (110) can be moved in the axial direction.

[0089] The control unit (400) is a component that controls the operation of the correction unit (300) based on the position information detected by the aforementioned detection unit (200) to correct the position of the waiting roll (2) and align the sheet of the waiting roll (2) with the sheet of the work roll (1), and is a component that controls the auto splicer to bond the sheet of the waiting roll (2) to the work roll (1).

[0090] This control unit (400) is configured as a conventional information processing device capable of information processing such as data collection and computation as shown in FIG. 1, and can control operation while communicating with the turret unwinder (100), detection unit (200), auto splicer and correction unit (300), and may be installed in a part of the turret unwinder (100).

[0091] Specifically, the control unit (400) may be configured together with an input / output unit (410), a memory (420), and a communication unit (430) as shown in FIG. 6.

[0092] The input / output unit (410) may include an input unit for receiving input from a user and an output unit for displaying the operating status of the turret unwinder (100), the detection unit (200), the auto splicer, and the correction unit (300).

[0093] For example, the input unit may include an operation panel that receives user input, and the output unit may include a display unit that displays on a screen the end (2b) of the sheet portion (2a) forming the waiting roll (2) and the end (1b) of the sheet portion (1a) forming the work roll (1), the turret unwinder (100), and the operation status of the correction unit (300), etc., which are detected by the detection unit (200).

[0094] In addition, the input unit may include devices capable of receiving various forms of user input, such as a keyboard, physical buttons, a touch screen, a camera, or a microphone.

[0095] Various types of data, such as files, applications, and programs, can be installed and stored in the memory (420), and data obtained from the detection unit (200) can be stored. Additionally, a program capable of controlling the operation of the correction unit (300) and adjusting the position of the waiting roll (2) based on the data obtained from the detection unit (200) may be stored in the memory.

[0096] The control unit (400) can control the overall operation of the turret unwinder (100), the detection unit (200), the auto splicer, and the correction unit (300), and may include a processor such as a CPU, GPU, etc.

[0097] Additionally, the control unit (400) may execute a program stored in memory (420), read data regarding information obtained from the detection unit (200) among the information stored in memory (420), or store new data in memory (420).

[0098] Here, the control unit (400) can control the correction unit (300) and adjust the position of the waiting roll (2) in two ways.

[0099] Specifically, referring to FIG. 9, the control unit (400) can align the sheet of the waiting roll (2) with the sheet of the working roll (1) by moving the end (2b) of the waiting roll (2) to be aligned with the end (1b) of the working roll (1) while detecting only the end (2b) of the roll portion (2a) of the waiting roll (2) through the detection unit (200).

[0100] Here, since the work roll (1) is in the position detected by the detection unit (200) when the work roll (1) is in the position of the waiting roll (2) in the previous process, or is in the position to correct the skewness of the sheet (4) after switching to the position of the work roll (1), the control unit (400) can detect only the end (2b) position of the waiting roll (2) and move it to a position corresponding to the pre-set position of the work roll (1).

[0101] In this case, if the position of the end (2b) of the waiting roll (2) detected through the detection unit (200) and the position of the pre-set end (1b) of the working roll (1a) have a deviation greater than the set value, the control unit (400) can align the working roll (1) and the waiting roll (2) in a line by moving the waiting roll (2) in the axial direction through the correction unit (300).

[0102] Additionally, as another embodiment for controlling the position of the waiting roll (2), the control unit (400) can move the axial end (2b) of the seat portion (2a) of the waiting roll (2), which is detected by the detection unit (200), to a preset reference position (C) through the control of the correction unit (300). That is, the control unit (400) can align the axial end (2b) of the seat portion (2a) of the waiting roll (2) with the axial end (1b) of the seat portion (1a) of the work roll (1) that is already located at the preset reference position (C) by moving the axial end (2b) of the seat portion (2a) of the waiting roll (2) to a preset position (C) through the axial movement of the fixed chuck (110).

[0103] Here, since the work roll (1) is aligned to correspond to the reference position (C) at the position corresponding to the waiting roll (2) in the previous process, when the waiting roll (2) moves to the reference position (C) in the current process, the ends of the work roll (1) and the waiting roll (2) can be aligned in a line. Even in this case, the work roll (1) and the waiting roll (2) can be aligned by detecting the position of only the end (2b) of the waiting roll (2) through the detection unit (200).

[0104] Meanwhile, when the control unit (400) mounts the standby roll (1) to the turret unwinder (100), it detects the end position of the branch pipe (3) forming the standby roll (1) through the detection unit (200), measures the tolerance with the branch pipe position of the work roll (1) mounted in the previous process or the set branch pipe position, and then adjusts the position of the fixed chuck (110) through the control of the correction unit (300).

[0105] Additionally, the control unit (400) may perform wired or wireless communication with another device or network through the configuration of the communication unit (430).

[0106] To this end, the communication unit (430) may include a communication module that supports at least one of various wired and wireless communication methods. For example, the communication module may be implemented in the form of a chipset.

[0107] Here, the wireless communication supported by the communication unit (430) may be, for example, Wi-Fi (Wireless Fidelity), Wi-Fi Direct, Bluetooth, Ultra Wide Band (UWB), or Near Field Communication (NFC). Additionally, the wired communication supported by the communication unit may be, for example, USB or HDMI (High Definition Multimedia Interface).

[0108] Additionally, the control unit (400) detects the edge of the sheet (4) being unwound from the waiting roll (2), which has been switched to the position of the work roll (1) after the sheet is joined by the auto splicer, through the edge profile sensor (240), and controls the correction unit (300) according to the detection result to move the work roll (1) in the axial direction so that the sheet (4) can be unwound in a straight line.

[0109] Here, the control unit (400) can continuously detect the edge of the sheet (4) being unwound from the work roll (1) at a set position or detect it at a set time interval through the edge profile sensor (240), and if the edge (4a) position at the first measured point and the edge (4b) position at the later measured point have a deviation greater than the set value as shown in FIG. 10, it determines that the unwound sheet (4) is meandering and corrects the unwinding angle of the work roll (1) sheet (4) by moving the fixed chuck (110) on which the work roll (1) is mounted in the axial direction through the correction unit (300).

[0110] At this time, the control unit (400) can adjust the work roll (1) so that the edge of the sheet (4) wound on the work roll (1) becomes aligned with point 4a by moving the work roll (1) while moving the fixed chuck (110) on which the work roll (1) is mounted, so that the end (1b) position of the roll portion (1a) of the work roll (1) set in the previous process corresponds to the edge (4a) of the point that was measured first.

[0111] The EPC (Edge Position Control) unit (500) is configured to control the unwinding angle of a sheet being unwound from a work roll (1) by moving the entire turret unwinder (100) in the axial direction of the work roll (1) through the control of the control unit (400) while movably supporting the lower part of the turret unwinder (100) as shown in FIGS. 1 and 2.

[0112] This EPC unit (500) may be configured to include a support (510) that supports the lower sides of the turret unwinder (100) respectively, and a movable block (520) that is fixed to the lower side of the turret unwinder (100) while being movably installed on the upper side of the support (510).

[0113] Here, the moving block (520) can be coupled to the upper part of the support (510) so as to be movable in the XY axis direction through an actuator or a ball screw structure, and the unwinding angle of the sheet can be adjusted by moving the turret unwinder (100) while moving through the control of the control unit (400).

[0114] Meanwhile, when the work roll (1) is switched to the position of the standby roll (2) after the sheet is exhausted, a phenomenon may occur in which the fixed chuck (110) does not come out smoothly from the pipe during the process of separating from the fixed chuck (110).

[0115] To resolve such problems, in one embodiment, another sheet supply device (10) may be configured to further include a clamp fixing plate (150) and a tube clamp (160) as shown in FIGS. 11 and 12.

[0116] The clamp fixing plate (150) is installed to be retractable in the turret unwinder (100) and can be operated by the control unit (400) when the sheet is depleted, and can protrude in a direction parallel to the tube (3) together with the tube clamp (160) described later.

[0117] These clamp fixing plates (150) are installed in the turret unwinder (100) via a hydraulic or pneumatic cylinder, and when the sheet of the work roll (1) is exhausted, they can be positioned in the middle part of the branch pipe (3) by moving in a direction parallel to the branch pipe (3) as shown in FIG. 12 through the operation of the cylinder by the control unit.

[0118] The above-mentioned tube clamp (160) is configured to allow the fixing chuck (110) to be separated from the tube (3) by moving together with the clamp fixing plate (150) and pressing and fixing the tube (3) in which the sheet has been exhausted.

[0119] These pipe clamps (160) can be installed on the clamp fixing plate (150) at least once, and by having a structure that can protrude through the control of the control unit (400), they can protrude toward the pipe (3) and press and fix the pipe (3).

[0120] Here, the pipe clamp (160) can be installed on the clamp fixing plate (150) in a pair facing each other as shown in FIG. 12, and can be fixed by applying pressure to the pipe (3) in a manner that protrudes toward the pipe (3) and grips the pipe (3) through a structure such as an actuator or a stepper motor.

[0121] Accordingly, the fixing clamp (110) can be smoothly separated from the tube (3) by moving to the opposite side of the tube (3) fixed by the tube clamp (160).

[0122] A sheet supply method by a sheet supply device (10) according to one embodiment including the above-mentioned components is described with reference to FIG. 7.

[0123] A sheet supply device (10) according to one embodiment can be applied to a process for manufacturing a solar module, and more specifically, can be applied prior to a process of continuously supplying an EVA (Ethyl Vinyl Acetate) sheet used in a solar module and cutting the EVA sheet to laminate it onto a solar module.

[0124] The waiting roll (2) can be loaded and mounted on the turret unwinder (100) where the sheet of the work roll (1) is being unwound (S100).

[0125] At this time, the waiting roll (2) can be mounted on a movable trolley (5) and moved by an autonomous mobile robot (AMR) to be mounted on a turret unwinder (100), and both ends of the branch tube (3) can be fixed to a fixed chuck (110) provided as a mechanical chuck on the turret body (102) constituting the turret unwinder (100).

[0126] Additionally, the control unit (400) can mount the waiting roll (2) to the fixed chuck (110) of the turret unwinder (100) by detecting the end position of the branch pipe (3) forming the waiting roll (2) through the detection unit (200) during the process of mounting the waiting roll (2) to the turret unwinder (100), measuring the tolerance with the branch pipe position of the working roll (1) mounted at the position of the waiting roll (1) of the previous process or the set branch pipe position, and then adjusting the position of the fixed chuck (110) through the control of the correction unit (300).

[0127] The position of the axial end (2a) of the roll portion (2a) constituting the standby roll (2) can be detected through the vision sensor (220) constituting the detection unit (200) of the control unit (400) (S200).

[0128] At this time, the control unit (400) can derive a deviation from the position information for the end (2a) of the roll portion (2a) of the waiting roll (2) provided by the detection unit (200) as shown in FIG. 9, the position information for the work roll (1) that was previously set in the previous process, or the position information set to correct the deviation of the sheet (4) of the work roll (1), and if the derived deviation exceeds a set value, the control unit (300) can correct the deviation by aligning the roll portion (2a) of the waiting roll (2) with the roll portion (1a) of the work roll (1) so that they form a line (S300).

[0129] Additionally, the control unit (400) may, depending on the case, derive position information for the end (2b) of the waiting roll (2) and the deviation from a preset reference position (C) to control the correction unit (300) and align the waiting roll (2) and the work roll (1).

[0130] At this time, the servo motor (310) can rotate the female screw (322) by rotating it by the control unit (400), and the male screw (321) can move linearly by the rotation of the female screw (322) and correct the axial position of the waiting roll (2) by moving the waiting roll (2) in the axial direction.

[0131] After the position of the waiting roll (2) is corrected, the control unit (400) can control the auto splicer to join the sheet of the work roll (1) and the sheet of the waiting roll (2), and after the joining of the sheets is completed, the turret unwinder (100) can be controlled to switch the positions of the waiting roll (2) and the work roll (1) (S400).

[0132] And the edge profile sensor (240) can detect the edge of the sheet (4) being unwound from the new work roll (1) whose position has been switched and transmit it to the control unit (400) (S500).

[0133] At this time, the control unit (400) can detect the edge of the sheet (4) being unwound from the work roll (1) by measuring it continuously or at a set time interval using an edge profile sensor (240), and if the edge (4a) at the first measured point and the edge (4b) at the later measured point have a deviation greater than a set value, it can determine that the sheet (4) being unwound is meandering.

[0134] When the control unit (400) determines that the sheet (4) being unwound from the work roll (1) is meandering through the detection signal of the edge profile sensor (240) (250), it can correct the position of the waiting roll (2) based on the edge position change information of the sheet (4) detected by the edge profile sensor (240) (S600).

[0135] At this time, the control unit (400) can control the correction unit (300) to move the fixed chuck (110) on which the work roll (1) is mounted in the axial direction, thereby moving the work roll (1) so that the position of the end (1b) of the roll portion (1a) of the work roll (1), which was previously set in the previous process, corresponds to the edge (4a) of the point that was measured first. Additionally, the control unit (400) can additionally control the EPC unit (500) to move the entire turret unwinder (100) in the axial direction of the work roll (1), thereby moving the work roll (1) so that the position of the end (1b) of the roll portion (1a) of the work roll (1) corresponds to the edge (4a) of the point that was measured first.

[0136] At this time, the control unit (400) can correct the position of the work roll (1) by moving the fixed chuck (110) in the axial direction through the control of the servo motor (310), and additionally, by controlling the operation of the EPC unit (500), it can adjust the unwinding angle of the work roll (1) sheet (4) by moving the position of the turret unwinder (100) in the axial direction of the work roll (1).

[0137] Accordingly, the axial position of the work roll (1) can be corrected according to the degree of meandering of the sheet (4).

[0138] As described above, according to the sheet supply device (10) of one embodiment, the control unit (400) detects the position of the end (2b) of the roll portion (2a) of the waiting roll (2) through the detection unit (200), and by moving the fixing chuck (110) that fixes the waiting roll (2) in the axial direction through the correction unit (300), the sheet of the waiting roll (2) can be accurately aligned to be in line with the sheet of the work roll (1).

[0139] In the embodiments above, the term 'part' refers to a software or hardware component such as an FPGA (field programmable gate array) or an ASIC, and the 'part' performs certain roles. However, the meaning of 'part' is not limited to software or hardware. The 'part' may be configured to reside in an addressable storage medium or may be configured to run one or more processors. Accordingly, as an example, the 'part' includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.

[0140] The functions provided within the components and 'parts' can be combined into a smaller number of components and 'parts' or separated from additional components and 'parts'.

[0141] In addition, the components and '~parts' may be implemented to play one or more CPUs within the device or secure multimedia card.

[0142] The sheet supply method according to the embodiment described through FIG. 7 may also be implemented in the form of a computer-readable medium that stores instructions and data executable by a computer. In this case, the instructions and data may be stored in the form of program code, and when executed by a processor, may generate a specific program module to perform a specific operation. Furthermore, the computer-readable medium may be any available medium accessible by a computer and includes both volatile and non-volatile media, as well as removable and non-removable media. Additionally, the computer-readable medium may be a computer recording medium, which may include both volatile and non-volatile, removable and non-removable media implemented by any method or technique for storing information such as computer-readable instructions, data structures, program modules, or other data. For example, the computer recording medium may be a magnetic storage medium such as an HDD and an SSD, an optical recording medium such as a CD, DVD, and Blu-ray disc, or a memory included in a server accessible via a network.

[0143] In addition, the sheet supply method according to the embodiment described through FIG. 7 may be implemented as a computer program (or computer program product) comprising instructions executable by a computer. The computer program includes programmable machine instructions processed by a processor and may be implemented in a high-level programming language, an object-oriented programming language, an assembly language, or a machine language. In addition, the computer program may be recorded on a tangible computer-readable recording medium (e.g., memory, hard disk, magnetic / optical medium, or SSD (Solid-State Drive), etc.).

[0144] Accordingly, the sheet supply method according to the embodiment described through FIG. 7 can be implemented by executing a computer program as described above by a computing device. The computing device may include at least some of a processor, memory, a storage device, a high-speed interface connected to the memory and a high-speed expansion port, and a low-speed interface connected to a low-speed bus and a storage device. Each of these components is connected to one another using various buses and may be mounted on a common motherboard or mounted in other suitable ways.

[0145] Here, the processor can process instructions within the computing device, such as instructions stored in memory or storage devices to display graphic information for providing a Graphic User Interface (GUI) on external input and output devices, such as a display connected to a high-speed interface. In another embodiment, a plurality of processors and / or a plurality of buses may be utilized together with a plurality of memories and memory types. Additionally, the processor may be implemented as a chipset comprising chips including a plurality of independent analog and / or digital processors.

[0146] In addition, memory stores information within a computing device. For example, memory may consist of volatile memory units or a set thereof. As another example, memory may consist of non-volatile memory units or a set thereof. Furthermore, memory may be other forms of computer-readable media, such as magnetic or optical discs.

[0147] And the storage device can provide a large amount of storage space to the computing device. The storage device may be a computer-readable medium or a configuration containing such a medium, and may include, for example, devices or other configurations within a Storage Area Network (SAN), and may be a floppy disk device, a hard disk device, an optical disk device, or a tape device, flash memory, or other similar semiconductor memory device or device array.

[0148] The embodiments described above are for illustrative purposes only, and those skilled in the art will understand that the embodiments described above can be easily modified into other specific forms without altering the technical concept or essential features of the embodiments described above. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0149] The scope of protection sought through this specification is defined by the claims set forth below rather than by the detailed description above, and should be interpreted to include all modifications or variations derived from the meaning and scope of the claims and the concept of equivalents. Explanation of the symbols

[0151] 10: Sheet supply device 100 : Turret Unwinder 101 : Rotation axis 102 : Turret body 110 : Fixed chuck 150 : Clamp fixing plate 160 : Tube clamp 200 : Detector 210 : Sensor support 220: Vision sensor 230 : Sensor moving member 231 : Sensor rail 232 : Sensor slider 240 : Edge profile sensor 250 : Additional edge profile sensor 300 : Correction part 310 : Servo motor 320 : Connecting member 321 : Male screw 322 : Female screw 400 : Control unit 500 : ECP unit 510 : Support 520 : Move block 1 : Work Roll 2 : Waiting Roll 3 : Geomancer 4 : Sheet 1a, 2a: Sheet portion 1b, 2b : End

Claims

Claim 1 A sheet supply device that continuously supplies sheets by connecting the leading end of a sheet of a waiting roll to the rear end of a sheet being unwound from a work roll with an auto splicer, wherein a fixed chuck is provided to fix both ends of a core forming the central axis of the work roll and the waiting roll so that the work roll and the waiting roll can be rotatably mounted respectively, thereby allowing the unwinding of the sheet, and a turret unwinder that switches the positions of the waiting roll and the work roll when the sheet of the work roll is exhausted; a sensing unit that detects the position of one end of the axial end of the waiting roll mounted on the turret unwinder; and a correction unit connected to the fixed chuck constituting the turret unwinder and correcting the position of the waiting roll while moving the fixed chuck in the axial direction. A sheet supply device comprising: a control unit that controls the operation of the correction unit based on position information of the waiting roll detected by the sensing unit to correct the position of the waiting roll and align the end of the waiting roll so as to be in alignment with the end of the work roll; wherein the fixed chuck comprises a pair of mechanical chucks installed to allow the waiting roll to move in the axial direction while fixing each end of the branch tube of the waiting roll; and wherein the correction unit comprises: a servo motor connected to one of the pair of mechanical chucks and rotating at a rotational speed set by the control unit; and a connecting member that connects the servo motor and the mechanical chuck and causes the mechanical chuck to move linearly in the axial direction of the waiting roll through the rotational movement of the servo motor. Claim 2 A sheet supply device that continuously supplies sheets by connecting the leading end of a sheet of a waiting roll to the rear end of a sheet being unwound from a work roll with an auto splicer, wherein a fixed chuck is provided to fix both ends of a core forming the central axis of the work roll and the waiting roll so that the work roll and the waiting roll can be rotatably mounted respectively, thereby allowing the unwinding of the sheet, and a turret unwinder that switches the positions of the waiting roll and the work roll when the sheet of the work roll is exhausted; a sensing unit that detects the position of one end of the axial end of the waiting roll mounted on the turret unwinder; a correction unit connected to the fixed chuck constituting the turret unwinder and corrects the position of the waiting roll by moving the fixed chuck in the axial direction; a control unit that controls the operation of the correction unit based on the position information of the waiting roll detected by the sensing unit to correct the position of the waiting roll and align the end of the waiting roll so that it forms a line with the end of the work roll; and a device provided in the turret unwinder that when the sheet of the work roll is exhausted A sheet supply device comprising: a clamp fixing plate that operates and protrudes in a direction parallel to the branch tube where the sheet is exhausted; and a branch tube clamp provided on the clamp fixing plate, protruding toward the branch tube to press and fix the branch tube while allowing the fixing chuck to be separated from the branch tube. Claim 3 A sheet supply device according to claim 1, wherein the connecting member comprises: one screw among a male screw and a female screw provided in the mechanical chuck; and the other screw among the male screw and the female screw connected by the servo motor in a state of being screw-coupled to the one screw, and causing the one screw to move linearly while rotating forward or reverse by the operation of the servo motor. Claim 4 A sheet supply device according to claim 1 or 2, wherein the sensing unit comprises: a sensor support installed adjacent to the turret unwinder; at least one vision sensor connected to the sensor support that photographs at least one of the axial end of the waiting roll and the end of the branch tube of the waiting roll and provides it to the control unit; and a sensor moving member installed on the sensor support that connects the vision sensor and the sensor support and allows the vision sensor to move by the control unit. Claim 5 In claim 4, the sheet feeder further comprises at least one edge profile sensor that detects the edge of the sheet being unwound from the work roll after the standby roll is switched to the position of the work roll. Claim 6 A sheet supply device according to claim 5, wherein the control unit operates the correction unit based on the detection signal of the edge profile sensor to correct the position of the work roll and adjusts the unwinding angle of the sheet being unwound from the work roll. Claim 7 In claim 6, the sheet supply device further comprises an EPC (Edge Position Control) unit that supports the lower part of the turret unwinder and allows the turret unwinder to move in the axial direction of the work roll through the control of the control unit, wherein the control unit controls the operation of the correction unit and the EPC unit based on a detection signal applied from the edge profile sensor and adjusts the unwinding angle of the work roll sheet. Claim 8 delete Claim 9 A sheet supply method performed by a sheet supply device that continuously supplies sheets by connecting the leading end of a sheet of a waiting roll to the rear end of a sheet being unwound from a work roll with an auto splicer, the method comprising: a step of loading and mounting the waiting roll onto a turret unwinder on which the work roll is mounted; a step of detecting the position of one end of the axial end of the waiting roll mounted on the turret unwinder; and a step of correcting the position of the waiting roll by moving the waiting roll in the axial direction so that the end of the waiting roll is aligned with the end of the work roll based on the position information of the waiting roll detected in the detecting step, wherein the step of loading and mounting the waiting roll includes a step of fixing each end of a branch tube forming the central axis of the waiting roll to a mechanical chuck installed to be movable in the axial direction on the turret unwinder, and the correcting step includes a step of moving the mechanical chuck in the axial direction while operating a servo motor connected to the mechanical chuck based on the position information. Claim 10 A sheet supply method performed by a sheet supply device that continuously supplies sheets by connecting the leading end of a sheet of a waiting roll to the trailing end of a sheet being unwound from a work roll with an auto splicer, comprising: a step of loading and mounting the waiting roll onto a turret unwinder on which the work roll is mounted; a step of detecting the position of one end of the axial end of the waiting roll mounted on the turret unwinder; a step of correcting the position of the waiting roll by moving the waiting roll in the axial direction so that the end of the waiting roll is aligned in line with the end of the work roll based on the position information of the waiting roll detected in the detection step; a step of continuously detecting the edge of the sheet being unwound from the work roll after the waiting roll is switched to the position of the work roll; and a step of correcting the position of the work roll based on the deviation between the edge position of the first measured point and the edge position of the later measured point among the edges detected in the step of detecting the edge of the sheet. Claim 11 A sheet supply method according to claim 9 or 10, wherein the step of detecting the position of one end of the waiting roll comprises the step of detecting one end of the axial ends of the waiting roll by photographing it with a vision sensor. Claim 12 delete Claim 13 A sheet supply method according to claim 10, wherein the step of correcting the position of the work roll further comprises the step of controlling the operation of an EPC (Edge Position Control) unit that supports the lower part of the turret unwinder so as to be movable in the axial direction, thereby moving the standby roll in the axial direction and adjusting the unwinding angle of the standby roll sheet.

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