Electrode roll replacement system

Abstract

The disclosed electrode roll replacement system comprises: a cantilever-shaped air chuck shaft which includes a first transfer mechanism installed in a hollow, with the shaft's longitudinal direction as a transfer direction and which has, on the surface thereof, the exposed first transfer surface of the first transfer mechanism; and an electric cart provided with a cantilever-shaped transport shaft which includes a second transfer mechanism installed in a hollow, with the shaft's longitudinal direction as a transfer direction and which has, on the surface thereof, the exposed second transfer surface of the second transfer mechanism, wherein, while the transport shaft of the electric cart is concentrically aligned with respect to the air chuck shaft, the first and second transfer mechanisms are operated by electricity to allow replacement of a bobbin between the air chuck shaft and the transport shaft.

Description

Electrode roll replacement system

[0001] The present invention relates to an electrode roll replacement system that can easily perform the replacement work of mounting a heavy electrode roll on an air chuck shaft without the intervention of manpower in a production process of a secondary battery that transports electrodes in a roll-to-roll manner.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2023-0103497, filed August 8, 2023, the entire contents of which are incorporated herein by reference.

[0003] Unlike primary batteries, secondary batteries are rechargeable and have the potential for miniaturization and large capacity, leading to extensive research and development in recent years. With increasing technological development and demand for mobile devices, and the emergence of electric vehicles and energy storage systems in response to the era's growing environmental concerns, demand for secondary batteries as an energy source is rapidly increasing.

[0004] Secondary batteries are classified into coin-shaped, cylindrical, square, and pouch-shaped batteries, depending on the shape of their battery cases. In secondary batteries, the electrode assembly mounted inside the battery case is a rechargeable, power-generating element comprised of a laminated structure of electrodes and a separator.

[0005] Electrode assemblies can be roughly classified into a jellyroll type in which a separator is interposed between sheet-shaped positive and negative electrodes coated with active materials, a stack type in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed between them, and a stack & folding type in which stack-type unit cells are wound with a long separator film.

[0006] Electrodes are manufactured by coating a current collector with an active material to form an electrode sheet, notching the electrode sheet, winding it onto a bobbin, drying it, and then unwinding the electrode sheet from the bobbin and cutting it to a specific size. In this way, various processes for processing secondary battery electrodes are continuously performed in a roll-to-roll manner. To this end, electrode rolls are loaded and unloaded onto the air chuck shaft of the unwinder and rewinder equipment.

[0007] Conventionally, electrode rolls of standard size were transported on an electric cart and replaced by workers pushing them onto an air chuck shaft. As equipment speeds increase, the replacement cycle for electrode rolls becomes shorter. A larger electrode roll roll roll capacity increases the replacement cycle, thereby increasing equipment utilization. However, the weight limit imposed on the manpower required for electrode roll replacement limits the ability to increase the roll capacity.

[0008] The purpose of the present invention is to provide an electrode roll replacement system that can increase the winding amount of electrode rolls by overcoming weight limitations and thereby improve equipment operating rate by constructing an automated system that utilizes power instead of the manpower of an operator when replacing an electrode roll on an air chuck shaft of an unwinder and rewinder equipment.

[0009] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0010] The present invention relates to an electrode roll replacement system, and in one example, to an electric carriage having a first transport mechanism installed inside a hollow space with the longitudinal direction of the shaft as the transport direction, a cantilever-shaped air chuck shaft having a first transport surface of the first transport mechanism exposed on a surface thereof, and a second transport mechanism installed inside the hollow space with the longitudinal direction of the shaft as the transport direction, and a cantilever-shaped transport shaft having a second transport surface of the second transport mechanism exposed on a surface thereof, wherein the first and second transport mechanisms are electrically operated in a state where the transport shaft of the electric carriage is concentrically aligned with respect to the air chuck shaft, so that a bobbin is exchanged between the air chuck shaft and the transport shaft.

[0011] In one embodiment, the first and second transport mechanisms are each a conveyor belt, and movement of the bobbin occurs by a frictional force acting between the conveyor belt and the inner surface of the bobbin.

[0012] In another embodiment, the first and second transport mechanisms are each a plurality of pinion gears, and movement of the bobbin occurs by engagement of the pinion gears with a rack gear formed on the inner surface of the bobbin.

[0013] Here, the plurality of pinion gears may include at least one driving gear and at least one driven gear that is directly or indirectly engaged with and rotates the driving gear.

[0014] And, the plurality of pinion gears are arranged in series along the longitudinal direction of the shaft, and odd-numbered pinion gears or even-numbered pinion gears can form the first and second transfer surfaces.

[0015] In this embodiment of the present invention, the transport shaft of the electric cart is docked and interconnected with the air chuck shaft, and the relative position at which the transport shaft of the electric cart is docked with respect to the air chuck shaft is limited to a predetermined position, so that the first and second transport surfaces can be aligned.

[0016] Meanwhile, the first and second transport mechanisms can be driven by independent power sources.

[0017] Alternatively, the power for operating the first and second transport mechanisms may be supplied from the power source of the electric cart.

[0018] For example, by docking the transport shaft of the electric cart to the air chuck shaft, power of the electric cart can be supplied to the first transport mechanism.

[0019] And, the relative position at which the transport shaft of the electric cart docks with respect to the air chuck shaft is limited to a predetermined position, and the first and second transport surfaces can be aligned together with the power of the electric cart being supplied to the first transport mechanism by docking the transport shaft of the electric cart with respect to the air chuck shaft.

[0020] The electrode roll replacement system of the present invention having the above configuration comprises an air chuck shaft provided in an unwinder or a rewinder and a transport shaft of an electric cart, each of which has a built-in mechanism for transporting a bobbin, and the transport shaft can be concentrically coupled to the air chuck shaft. Accordingly, a bobbin mounted on the air chuck shaft or the transport shaft can be transported from the air chuck shaft to the transport shaft, or vice versa, by the operation of the first and second transport mechanisms.

[0021] In this way, since the air chuck shaft and the transport shaft each have an electrically operated transport mechanism built in, a heavy electrode roll can be discharged from the air chuck shaft of the rewinder or fed into the air chuck shaft of the unwinder without human intervention, the electrode roll replacement system of the present invention can increase the winding amount of the electrode roll without being subject to weight limitations resulting from human intervention, thereby improving the equipment operating rate.

[0022] However, the technical effects that can be obtained through the present invention are not limited to the above-described effects, and other effects that are not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0023] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0024] Figure 1 is a drawing showing the overall configuration of an electrode roll replacement system according to the present invention.

[0025] Figure 2 is a drawing showing one embodiment of an air chuck shaft.

[0026] Figure 3 is a cross-sectional view along the line “AA” shown in Figure 2.

[0027] Fig. 4 is a drawing showing one embodiment of a transport shaft of an electric bogie.

[0028] Figure 5 is a drawing showing the docking end of the air chuck shaft and the transport shaft.

[0029] Fig. 6 is a drawing showing a state in which the electrode roll is replaced along the air chuck shaft and the transport shaft.

[0030] FIG. 7 is a drawing showing another embodiment of an air chuck shaft and a transport shaft.

[0031] FIG. 8 is a drawing showing one embodiment of a docking end for supplying power of an electric cart to a first transport mechanism of an air chuck shaft.

[0032] The present invention can be modified in various ways and has many embodiments, and specific embodiments will be described in detail below.

[0033] However, this is not intended to limit the present invention to a specific embodiment, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0034] In the present invention, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0035] Additionally, in the present invention, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "directly above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "directly below" the other part, but also cases where there is another part in between. Furthermore, in the present application, "being placed on" may include cases where it is placed below as well as above.

[0036]

[0037] The present invention relates to an electrode roll replacement system, and in one example, to an electric carriage having a first transport mechanism installed inside a hollow space with the longitudinal direction of the shaft as the transport direction, a cantilever-shaped air chuck shaft having a first transport surface of the first transport mechanism exposed on a surface thereof, and a second transport mechanism installed inside the hollow space with the longitudinal direction of the shaft as the transport direction, and a cantilever-shaped transport shaft having a second transport surface of the second transport mechanism exposed on a surface thereof, wherein the first and second transport mechanisms are electrically operated in a state where the transport shaft of the electric carriage is concentrically aligned with respect to the air chuck shaft, so that a bobbin is exchanged between the air chuck shaft and the transport shaft.

[0038] The air chuck shaft provided in the unwinder or rewinder and the transport shaft of the electric cart each have a mechanism for transporting a bobbin, and the transport shaft can be concentrically coupled (docked) to the air chuck shaft. Accordingly, a bobbin mounted on the air chuck shaft or the transport shaft can be transported from the air chuck shaft to the transport shaft, or vice versa, by the operation of the first and second transport mechanisms.

[0039] In this way, since the air chuck shaft and the transport shaft each have an electrically operated transport mechanism built in, a heavy electrode roll can be discharged from the air chuck shaft of the rewinder or fed into the air chuck shaft of the unwinder without human intervention, the electrode roll replacement system of the present invention can increase the winding amount of the electrode roll without being subject to weight limitations resulting from human intervention, thereby improving the equipment operating rate.

[0040] Hereinafter, a specific embodiment of an electrode roll replacement system (10) according to the present invention will be described in detail with reference to the attached drawings. For reference, the directions of front / back, up / down / left / right, etc., used to designate relative positions in the following description are intended to aid understanding of the invention, and unless otherwise specifically defined, the directions shown in the drawings are taken as a reference.

[0041]

[0042] [First Embodiment]

[0043] FIG. 1 is a drawing showing the overall configuration of an electrode roll replacement system (10) according to the present invention. The electrode roll replacement system (10) of the present invention includes an electric carriage (200) equipped with an air chuck shaft (110) having a first electric transport mechanism (120) built therein, and a transport shaft (210) having a second electric transport mechanism (220) built therein, similarly to the first electric transport mechanism. An electrode roll (500), i.e., an electrode roll (500) having an electrode (520) wound on a cylindrical bobbin (510), is inserted and mounted on the air chuck shaft (110) and the transport shaft (210). Therefore, the air chuck shaft (110) and the transport shaft (210) have the same outer diameter corresponding to the inner diameter of the bobbin (510).

[0044] To enable insertion and ejection of the electrode roll (500), the air chuck shaft (110) is provided in a cantilever shape with respect to the unwinder or rewinder (100) equipment. Similarly, the transport shaft (210) is provided in a cantilever shape on an electric cart (200) having a driving function, and the electrode roll (500) is mounted on and moves on the transport shaft (210). The electric cart (200) may be a cart driven by a worker or an automated guided vehicle (AGV).

[0045] FIG. 2 is a drawing illustrating one embodiment of an air chuck shaft (110), and FIG. 3 is a cross-sectional view of the air chuck shaft (110) taken along line “AA.” The air chuck shaft (110) includes a first transfer mechanism (120) installed inside a hollow space with the longitudinal direction of the shaft (112) as the transfer direction, and a first transfer surface (122) of the first transfer mechanism (120) is exposed on the surface. In the embodiment illustrated in FIG. 2, the first transfer mechanism (120) is configured as a conveyor belt (300), and the surface of the conveyor belt (300) is exposed outside the shaft (112) to form the first transfer surface (122).

[0046] The first transport mechanism (120) may include one or more conveyor belts (300), and when a plurality of conveyor belts (300) are provided, they may be uniformly arranged along the circumferential direction of the shaft (112). In addition, an air chucking rubber (140) is also illustrated in FIGS. 2 and 3. The air chucking rubber (140) is a pneumatically operated chucking mechanism that can move forward and backward along the radial direction of the air chuck shaft (110). When pneumatic pressure is applied, the air chucking rubber (140) moves forward along the radial direction, and the advanced air chucking rubber (140) fixes the inner surface of the bobbin (510) by frictional force, thereby chucking the electrode roll (500). Conversely, when the pneumatic pressure is removed, the chucking action is released. Since the chucking operation of the air chuck shaft (110) corresponds to a known technology, further description thereof will be omitted.

[0047] Fig. 4 is a drawing illustrating one embodiment of a transport shaft (210) of an electric cart (200). The transport shaft (210) installed in a cantilever shape on the electric cart has almost the same structure as the air chuck shaft (110) described above. That is, the transport shaft (210) includes a second transport mechanism (220) installed inside a hollow space with the longitudinal direction of the shaft (212) as the transport direction, and a second transport surface (222) of the second transport mechanism (220) is exposed on the surface of the shaft (212).

[0048] However, the transport shaft (210) does not necessarily need to be equipped with an air chucking rubber (140). The main function of the air chucking rubber (140) equipped on the air chuck shaft (110) is to firmly fix the bobbin (510) so that the rotational driving force of the air chuck shaft (110) is fully transmitted to the electrode roll (500). In this respect, as long as there is no risk of the electrode roll (500) being transported falling, there will be little need to equip the transport shaft (210) that does not rotate with an air chucking rubber (140).

[0049] FIG. 5 is a drawing illustrating one embodiment of the docking ends (130, 230) of the air chuck shaft (110) and the transport shaft (210). As described below, the movement of the electrode roll (500) is performed while the respective free ends of the air chuck shaft (110) and the transport shaft (210) are concentrically aligned and in contact or connected with each other. In this way, when the respective free ends of the air chuck shaft (110) and the transport shaft (210) are concentrically aligned and connected with each other, this is expressed as docking of the air chuck shaft (110) and the transport shaft (210), and each free end of the air chuck shaft (110) and the transport shaft (210) can be referred to as docking ends (130, 230).

[0050] In this way, when the transport shaft (210) of the moving electric cart (200) is docked and interconnected with the fixedly installed air chuck shaft (110), the relative position at which the transport shaft (210) of the electric cart (200) docks with respect to the air chuck shaft (110) can be limited to a predetermined position. For example, as shown in FIG. 5, a groove structure (132) for determining a coupling direction can be provided at the docking end (130) of the air chuck shaft (110) {FIG. 5 (a)}, and correspondingly, a complementary protrusion structure (232) can be provided at the docking end (230) of the transport shaft (210) {FIG. 5 (b)}. Through this, the first transport surface (122) of the air chuck shaft (110) and the second transport surface (222) of the transport shaft (210) can be aligned in a single line.

[0051] Fig. 6 is a drawing showing a state in which the electrode roll (500) is replaced along the air chuck shaft (110) and the transport shaft (210). When the air chuck shaft (110) and the transport shaft (210) are connected in a row, the electrode roll (500) located on either the air chuck shaft (110) or the transport shaft (210) is moved to the other side by the electric operation of the first and second transport mechanisms (120, 220).

[0052] FIG. 6 (a) illustrates an example of removing a bobbin (510) from an air chuck shaft (110) equipped in an unwinder (100) and then mounting a new electrode roll (500) transported by an electric cart (200). After the docking ends (130, 230) of the air chuck shaft (110) and the transport shaft (210) are connected, the first transport mechanism (120) and the second transport mechanism (220) move the first and second transport surfaces (122, 222) from right to left based on the drawing, and accordingly, the electrode roll (500) on the transport shaft (210) moves to the air chuck shaft (110). The first and second transport mechanisms (120, 220) of the illustrated embodiment are conveyor belts (300), and movement of the electrode roll (500) occurs by frictional force acting between the conveyor belt (300) and the inner surface of the bobbin (510).

[0053] FIG. 6 (b) is an example of the opposite case, in which an electrode roll (500) on an air chuck shaft (110) equipped in a rewinder (100) equipment is moved to an electric cart (200). After the docking ends (130, 230) of the air chuck shaft (110) and the transport shaft (210) are connected, the first transport mechanism (120) and the second transport mechanism (220) move the first and second transport surfaces (122, 222) from left to right based on the drawing, and accordingly, the electrode roll (500) on the air chuck shaft (110) moves to the transport shaft (210).

[0054] It is natural that the first and second transport mechanisms (120, 220) operate in opposite directions during the opposite transport of supplying or removing the electrode roll (500) to or from the air chuck shaft (110). In addition, as described in FIG. 5, when the docking position of the transport shaft (210) with respect to the air chuck shaft (110) is limited to a predetermined position, so that the first transport surface (122) of the air chuck shaft (110) and the second transport surface (222) of the transport shaft (210) are aligned in a row, the driving force of the first and second transport mechanisms (120, 220) for moving the electrode roll (500) is smoothly transferred, so that stable transport can be achieved.

[0055]

[0056] [Second Embodiment]

[0057] FIG. 7 is a drawing showing another embodiment for the air chuck shaft (110) and the transport shaft (210), showing an example in which the first and second transport mechanisms (120, 220) are composed of gear mechanisms rather than conveyor belts (300).

[0058] Although Fig. 7 illustrates an air chuck shaft (110), it will be readily apparent that the structure of Fig. 7 can be applied to a transport shaft (210) as is, as clarified in the description of the first embodiment. Furthermore, although Fig. 7 omits the illustration of the air chucking rubber (140) provided on a conventional air chuck shaft (110), it will be readily apparent that such omission will not significantly impede the understanding of the present invention.

[0059] In the embodiment of FIG. 7, the first transfer mechanism (120) built into the air chuck shaft (110) is a plurality of pinion gears (400), and the teeth of the pinion gears protruding out of the air chuck shaft (110) form a first transfer surface (122). Correspondingly, a rack gear (512) is formed on the inner surface of the bobbin (510), and accordingly, the rack gear (512) on the inner surface of the bobbin (510) continuously meshes with the pinion gear (400) that drives rotation, thereby causing movement of the bobbin (510).

[0060] Here, the plurality of pinion gears (400) may include at least one driving gear (410) and at least one driven gear (420) that is directly or indirectly meshed with the driving gear (410) and passively rotates. These plurality of pinion gears (400) are arranged in series along the longitudinal direction of the air chuck shaft (110), and the pinion gears (400) forming the first transfer surface (122) protrude alternately one by one. For example, odd-numbered pinion gears (400) or even-numbered pinion gears (400) along the longitudinal direction of the shaft (112) may form the first transfer surface (122). This is because the rotational direction of the pinion gears (400) that are continuously engaged alternates clockwise / counterclockwise, so that in order to transfer the bobbin (510), it is necessary to form a first transfer surface (122) with pinion gears (400) that rotate in the same direction.

[0061] For reference, although not shown in FIG. 7, a plurality of pinion gears (400) may be mounted in a single frame structure, like a gearbox, and the installation of a plurality of pinion gears (400) in the air chuck shaft (110) may be simplified through this frame structure. In addition, as shown in FIG. 5, by providing a structure that limits the coupling direction at the docking end (130, 230) and aligning the first and second transfer surfaces (122, 222) in a single row, it is possible to reliably ensure that the rack gear (512) on the inner surface of the bobbin (510) continuously meshes with the first and second transfer mechanisms (120, 220).

[0062]

[0063] [Embodiment 3]

[0064] The third embodiment relates to an exemplary embodiment for supplying power to the first and second transport mechanisms (120, 220). In the simplest case, the first and second transport mechanisms (120, 220) can be driven by independent power sources. That is, the first transport mechanism (120) can be driven by the power source (not shown) of the unwinder / rewinder (100) equipment in which the air chuck shaft (110) is installed, while the second transport mechanism (220) can be driven by the power source (240) of the electric cart (200) in which the transport shaft (210) is installed.

[0065] However, since the air chuck shaft (110) has a structure in which the shaft (112) rotates to rotate the electrode roll (500) and the air chuck mechanism is built in, the structure for supplying power to the inside of the air chuck shaft (110) may become somewhat complicated. FIG. 8 is a drawing exemplarily illustrating a third embodiment, in which the power (240) of the electric carriage (200) is supplied to the first transfer mechanism (120) of the air chuck shaft (110) so as to further simplify the internal structure of the air chuck shaft (110).

[0066] FIG. 8 is a drawing showing one embodiment of a docking end (130, 230) for supplying power (240) of an electric cart (200) to a first transport mechanism (120) of an air chuck shaft (110). When a transport shaft (210) of an electric cart (200) docks with an air chuck shaft (110), power (240) of the electric cart (200) can be supplied to the first transport mechanism (120). For example, when the docking end (130) of the air chuck shaft (110) forms a receptacle (132) having a groove structure and the docking end (230) of the transport shaft (210) forms a plug (232) having a protrusion structure, the air chuck shaft (110) and the transport shaft (210) can form an electrical connection as well as a mechanical connection. Accordingly, the power (240) of the electric cart (200) can be supplied to the first transport mechanism (120) as well as the second transport mechanism (220).

[0067] In the embodiment exemplarily illustrated in FIG. 8, the docking position of the transport shaft (210) relative to the air chuck shaft (110) is limited to a predetermined position by a groove and protrusion structure (132, 232) that specifies the coupling direction, thereby allowing the power (240) of the electric cart (200) to be supplied to the first transport mechanism (120) and the first transport surface (122) and the second transport surface (222) to be aligned.

[0068]

[0069] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0070]

[0071] [Explanation of symbols]

[0072] 10: Electrode roll replacement system 100: Unwinder / rewinder

[0073] 110: Air chuck shaft 112: Shaft

[0074] 120: First transfer mechanism 122: First transfer surface

[0075] 130: Docking end 132: Home structure (outlet)

[0076] 140: Air chucking rubber 200: Electric cart

[0077] 210: Transport shaft 212: Shaft

[0078] 220: Second transfer mechanism 222: Second transfer surface

[0079] 230: Docking end 232: Protrusion structure (plug)

[0080] 240: Power 300: Conveyor belt

[0081] 400: Pinion gear 410: Drive gear

[0082] 420: Driven gear 500: Electrode roll

[0083] 510: Bobbin 512: Rack gear

[0084] 520: Electrode

Claims

1. A cantilever-shaped air chuck shaft including a first transfer mechanism installed inside a hollow space with the longitudinal direction of the shaft as the transfer direction, and a first transfer surface of the first transfer mechanism exposed on the surface; and An electric cart having a cantilever-shaped transport shaft with a second transport mechanism installed inside a hollow space with the longitudinal direction of the shaft as the transport direction, and a second transport surface of the second transport mechanism exposed on the surface; Including, An electrode roll replacement system in which the first and second transport mechanisms are electrically operated to exchange bobbins between the air chuck shaft and the transport shaft while the transport shaft of the electric cart is concentrically aligned with respect to the air chuck shaft.

2. In paragraph 1, The first and second transport mechanisms are each a conveyor belt, An electrode roll replacement system in which movement of the bobbin occurs due to frictional force acting between the conveyor belt and the inner surface of the bobbin.

3. In paragraph 1, The first and second transfer mechanisms are each a plurality of pinion gears, An electrode roll replacement system in which movement of the bobbin occurs by engagement of the pinion gear and the rack gear formed on the inner surface of the bobbin.

4. In paragraph 3, The above plurality of pinion gears are, An electrode roll replacement system comprising at least one driving gear and at least one driven gear that is directly or indirectly engaged with the driving gear and rotates.

5. In paragraph 4, The above plurality of pinion gears are arranged in series along the length of the shaft, An electrode roll replacement system, wherein odd-numbered pinion gears or even-numbered pinion gears form the first and second transfer surfaces.

6. In paragraph 2 or 3, The transport shaft of the electric cart is docked and interconnected with the air chuck shaft, An electrode roll replacement system in which the relative position at which the transport shaft of the electric cart docks with respect to the air chuck shaft is limited to a predetermined position, and the first and second transport surfaces are aligned accordingly.

7. In paragraph 1, An electrode roll replacement system in which the first and second transport mechanisms are driven by independent power sources.

8. In paragraph 1, An electrode roll replacement system in which the power for operating the first and second transport mechanisms is supplied from the power source of the electric cart.

9. In paragraph 8, An electrode roll replacement system in which the transport shaft of the electric cart is docked to the air chuck shaft, thereby supplying power to the electric cart to the first transport mechanism.

10. In paragraph 9, The relative position at which the transport shaft of the electric cart docks with respect to the air chuck shaft is limited to a predetermined position, An electrode roll replacement system in which the first and second transport surfaces are aligned together with the power of the electric cart being supplied to the first transport mechanism by docking the transport shaft of the electric cart to the air chuck shaft.

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