JP7364327B2 - Unnecessary sheet removal device and unnecessary sheet removal method - Google Patents

Description

The present invention relates to an unnecessary sheet removing device and an unnecessary sheet removing method.

BACKGROUND ART Conventionally, there has been known an apparatus that peels off and collects a plurality of adhesive sheets and a band-shaped unnecessary sheet from an original fabric temporarily attached to a band-shaped release sheet (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2008-55661

However, in the continuous label manufacturing device 11 (unnecessary sheet removing device) described in Patent Document 1, label waste 21A (unnecessary sheet) peeled from the continuous label body 12 (original fabric) is collected by the waste take-up roller 18 (recovery means). Since the unnecessary sheets are collected while being pulled, the unsupported unnecessary sheet portion located between the peeling start part where the unnecessary sheets are peeled off from the release paper 23 (release sheet) and the collection start part where the unnecessary sheets are collected by the collection means is collected. There is an inconvenience that the sheet is cut due to the tension of the means, resulting in failure to collect the unnecessary sheet. Such inconvenience becomes noticeable when the unnecessary sheet is soft or brittle, or has a narrow width.

SUMMARY OF THE INVENTION An object of the present invention is to provide an unnecessary sheet removing device and an unnecessary sheet removing method that can prevent failure to collect unnecessary sheets as much as possible.

The present invention employs the configuration described in the claims.

According to the present invention, since the unnecessary sheet is sent in the direction of the collecting means in synchronization with the collecting operation of the collecting means, the unsupported unnecessary sheet portion located between the peeling start part and the collecting start part is cut by the tension of the collecting means. Therefore, it is possible to prevent as much as possible the failure to collect unnecessary sheets.
In addition, if the unnecessary sheets are sent toward the collecting means using a plurality of roller members that sandwich and curve the unnecessary sheets or a belt member wrapped around a pulley, the area that comes into contact with the unsupported unnecessary sheet portion can be increased. , the unsupported unnecessary sheet portion can be sent toward the collection means.

FIG. 1 is an explanatory diagram of an unnecessary sheet removing device according to an embodiment of the present invention.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
Note that the X-axis, Y-axis, and Z-axis in this embodiment are orthogonal to each other, and the X-axis and Y-axis are axes within a predetermined plane, and the Z-axis is an axis perpendicular to the predetermined plane. do. Furthermore, in this embodiment, when directions are shown based on the view from the front side of FIG. ``Left'' is the direction of the arrow on the X-axis, ``Right'' is the opposite direction, ``Front'' is the front direction in FIG. 1 parallel to the Y-axis, and ``Rear'' is the opposite direction.

In FIG. 1, the unnecessary sheet removal device EA includes a feeding means 10 that feeds out a raw fabric RS in which a plurality of adhesive sheets AS and a band-shaped unnecessary sheet US are temporarily attached to a band-shaped release sheet RL, and an unnecessary sheet from the release sheet RL. A collection means 20 that peels off the US and performs a predetermined collection operation to collect the unnecessary sheet US, a peeling start part PT1 where the unnecessary sheet US is peeled off from the release sheet RL, and a collection means 20 that collects the unnecessary sheet US. A semiconductor wafer (hereinafter referred to as a A sheet sticking device EA1 is formed by a pressing means 40 that presses and sticks an adhesive sheet AS onto a wafer (also simply referred to as a "wafer"), and a supporting means 50 that supports the wafer WF.

The feeding means 10 includes a support roller 11 that supports an adhesive sheet laminate RS1 in which a strip-shaped adhesive sheet base material BS is temporarily attached to a release sheet RL and a cover sheet CS is temporarily attached to the adhesive sheet base material BS; A predetermined tension is always applied to the first to fourth guide rollers 12A to 12D that guide the adhesive sheet laminate RS1 and the like, and to the cover sheet CS that is wrapped around the second guide roller 12B and peeled from the adhesive sheet base material BS. a cover sheet collection roller 13 that applies and winds and collects the cover sheet CS; an adhesive sheet AS that forms a closed loop cut CU in the adhesive sheet base material BS and is located inside the cut CU; It is configured to feed out the original fabric RS, including a cutting means 14 that forms unnecessary sheets US located outside the cut CU, and a feeding force applying unit 15 that applies a feeding force to the original fabric RS.
The cutting means 14 is supported by an output shaft 14B of a rotation motor 14A as a driving device, and has a die-cut roller 14D provided with a cutting blade 14C as a flat loop-shaped cutting member on its circumferential surface, and is synchronized with the die-cut roller 14D. It also includes a rotating anvil roller 14E.
The force applying means 15 includes a support plate 15C supported by a slider 15B of a linear motor 15A as a driving device, a rotary motor 15D as a driving device supported by the support plate 15C, and a rotary motor 15D (not shown) as a driving device. The release sheet RL is wound while always applying a predetermined tension to the release sheet RL, which exists between the drive roller 15F supported by the output shaft and sandwiching the release sheet RL with the pinch roller 15E, and the pinch roller 15E. A release sheet collecting roller 15G is provided.

The collecting means 20 is driven by an unnecessary sheet collecting roller 21 that is wound around a fourth guide roller 12D and winds and collects the unnecessary sheet US peeled from the release sheet RL, and a rotation motor 22 as a driving device. It includes a drive roller 23 and a biasing means 24 that biases the unnecessary sheet collection roller 21 in the direction of the drive roller 23 with the unnecessary sheet US interposed therebetween and causes the unnecessary sheet collection roller 21 to wind the unnecessary sheet US. There is.
The urging means 24 includes a rotating arm 24B that is rotatably supported by a fulcrum shaft 24A, rotatably supports the unnecessary sheet collecting roller 21 on the opposite side of the fulcrum shaft 24A, and a rotating arm 24B that rotates the rotating arm 24B in the direction of the drive roller 23. The spring 24C is provided with a spring 24C.

The unnecessary sheet feeding means 30 includes a plurality of roller members 31 that sandwich the unnecessary sheet US and curve the unnecessary sheet US, and a rotational force applying means that applies rotational force to the plurality of roller members 31, and serves as a driving device. The moving motor 32 supports the unsupported unnecessary sheet portion US1 located between the peeling start part PT1 and the collection start part PT2, and sends the unnecessary sheet US toward the collection means 20. Note that each roller member 31 is configured to be rotationally driven by a rotary motor 32 via a pulley (not shown) attached to each roller member and a belt 33 as a driving force transmission means that is passed around each pulley. ing.

The pressing means 40 is all shared with the feeding means 10, and includes a linear motor 15A, a slider 15B, a support plate 15C, a rotation motor 15D, a pinch roller 15E, a drive roller 15F, and a release sheet collection roller 15G.

The support means 50 is supported by a direct-acting motor 51 as a driving device and an output shaft 51A of the direct-acting motor 51, and is a holding surface that can be held by suction by a decompression means (holding means) not shown, such as a decompression pump or a vacuum ejector. 52A.

The operation of the sheet pasting device EA1 equipped with the unnecessary sheet removing device EA described above will be explained.
First, a user of the sheet applicator EA1 (hereinafter simply referred to as "user") attaches the adhesive sheet laminate RS1 to the sheet applicator EA1 in which each member is placed at the initial position shown by the solid line in FIG. It is set as shown in the figure, and a signal to start automatic operation is inputted via an operation means (not shown) such as an operation panel or a personal computer. Then, the feeding means 10, the collecting means 20, and the unnecessary sheet feeding means 30 drive the rotation motors 14A, 15D, 22, and 32, and while feeding out the adhesive sheet laminate RS1, rotate the die-cut roller 14D to cut the adhesive sheet base material. By forming a closed-loop cut CU in BS, a raw fabric RS in which the adhesive sheet AS and the unnecessary sheet US are temporarily attached to the release sheet RL is formed, and the raw fabric RS is fed out.

Next, as shown in FIG. 1, a camera, a projector, etc. is used to detect that the leading end in the feeding direction of the first adhesive sheet AS temporarily attached to the release sheet RL has reached a predetermined position below the third guide roller 12C. When a sheet leading edge detection device (not shown) consisting of various sensors such as an optical sensor and an ultrasonic sensor detects the detection, the feeding means 10, the collecting means 20, and the unnecessary sheet feeding means 30 are activated by the rotating motors 14A, 15D, 22, 32. Stops driving.
Note that when the original fabric RS is fed out as described above, the cover sheet CS is peeled off from the adhesive sheet base material BS by the second guide roller 12B, and is collected by being wound around the cover sheet collection roller 13. The unnecessary sheet US is peeled off from the release sheet RL by the fourth guide roller 12D, wound around the unnecessary sheet collection roller 21, and collected.
Here, the unnecessary sheets US peeled off from the release sheet RL are sent toward the collection means 20 by a roller member 31 that is rotationally driven in synchronization with the collection operation of the collection means 20, that is, the rotational operation of the unnecessary sheet collection roller 21. , the unnecessary sheet is taken up by the unnecessary sheet collection roller 21.

Thereafter, when the user or a conveyance means (not shown) such as a belt conveyor or an articulated robot places the wafer WF on the holding surface 52A as shown in FIG. 1, the support means 50 drives the decompression means (not shown). , starts sucking and holding the wafer WF on the holding surface 52A. Next, the feeding means 10 drives the linear motor 15A with the rotary motor 15D locked, moves the support plate 15C to the right as shown by the two-dot chain line in FIG. Let out. At this time, the feeding means 10, the collecting means 20, and the unnecessary sheet feeding means 30 drive the rotation motors 14A, 22, and 32, and the cover sheet collecting roller 13 collects the cover sheet CS and cuts it into the adhesive sheet base material BS. At the same time, the unnecessary sheets US sent by the roller member 31 are collected by the unnecessary sheet collecting roller 21. When a sheet leading edge detection device (not shown) detects that the leading end in the feeding direction of the next adhesive sheet AS following the first adhesive sheet AS has reached a predetermined position below the third guide roller 12C, the feeding means 10, the collecting unit 10, The means 20 and the unnecessary sheet feeding means 30 stop driving the linear motor 15A and rotation motors 14A, 22, and 32.

Next, the support means 50 drives the linear motor 51 to raise the table 52 as shown by the two-dot chain line in FIG. The support plate 15C is moved to the left while rolling the roller 15F to press the original fabric RS against the wafer WF. As a result, the adhesive sheet AS is attached to the upper surface of the wafer WF, and the release sheet RL is peeled off from the adhesive sheet AS, and the peeled release sheet RL is collected by the release sheet collection roller 15G. Thereafter, when the release sheet RL is completely peeled off from the adhesive sheet AS and the support plate 15C returns to its initial position, the pressing means 40 stops driving the linear motor 15A and rotation motor 15D.

Next, the supporting means 50 drives the linear motor 51 to return the table 52 to its initial position, and then stops driving the pressure reducing means (not shown) to release the suction and holding of the wafer WF on the holding surface 52A. Then, the user or a transport means (not shown) transports the wafer WF on the holding surface 52A to the next step, and the same operations as described above are repeated thereafter.

According to the embodiment described above, since the unnecessary sheets US are sent in the direction of the collecting means 20 in synchronization with the collecting operation of the collecting means 20, there is no need for support located between the peeling start part PT1 and the collecting start part PT2. The sheet portion US1 is prevented from being cut by the tension of the collecting means 20, and failure to collect the unnecessary sheets US can be prevented as much as possible.

As mentioned above, although the best configuration, method, etc. for carrying out the present invention are disclosed in the above description, the present invention is not limited thereto. That is, although the present invention has been particularly illustrated and described primarily with respect to particular embodiments, there are modifications in shape, shape, and shape to the embodiments described above without departing from the spirit and scope of the invention. Those skilled in the art can make various modifications in materials, quantities, and other detailed configurations. In addition, the descriptions that limit the shape, material, etc. disclosed above are described as examples to facilitate understanding of the present invention, and do not limit the present invention. Descriptions of names of members that exclude some or all of the limitations such as these are included in the present invention.

For example, the feeding means 10 supports, with the support roller 11, the raw fabric RS on which the adhesive sheet AS and the unnecessary sheet US are temporarily attached to the release sheet RL by forming cuts CU in advance in the adhesive sheet base material BS. , the raw fabric RS may be fed out, and in this case, the feeding means 10 may or may not be equipped with the cutting means 14.
The feeding means 10 moves the support roller 11, the first to fourth guide rollers 12A to 12D, the cover sheet collection roller 13, the cutting means 14, etc. without moving the support plate 15C or while moving the support plate 15C, and moves the original fabric RS. Alternatively, the original web RS may be held by a holding means such as a chuck cylinder or a suction pad and then unwound, or the adhesive sheet laminate RS1 or original web RS may be supported by fan-folding without winding. The anti-RS may be fed out, or the cover sheet CS and release sheet RL may be fan-folded without being wound, for example, or cut into pieces with a shredder, etc., and collected. They may simply be collected and collected without being rolled or fan-folded.
The cutting means 14 may move the cutting member without or while moving the adhesive sheet laminate RS1 to form cuts CU in the adhesive sheet base material BS to form the original fabric RS, or Before peeling the cover sheet CS from the sheet base material BS, the raw fabric RS may be formed by penetrating the cover sheet CS and forming cuts CU in the adhesive sheet base material BS, or as a cutting member, for example, , a so-called flat blade may be employed that forms a predetermined-shaped cut CU in the adhesive sheet base material BS by moving away from and approaching the adhesive sheet base material BS, or the cutting blade 14C may be moved toward the die-cut roller 14D. It may be removable or non-removable.

The collecting means 20 may collect the unnecessary sheet US peeled off from the release sheet RL without being passed around the fourth guide roller 12D, or may collect the unnecessary sheet US by folding it in a fan fold or by cutting it into pieces with a shredder or the like, for example. The unnecessary sheets US may be collected, and in these cases, the unnecessary sheet feeding means 30 sends the unnecessary sheets US to the collecting means in synchronization with the collecting operation of the collecting means 20, which fan-folds or shreds them with a shredder or the like. It may be configured to perform a sending operation in 20 directions.
The collecting means 20 may drive the unnecessary sheet collecting roller 21 using a rotating motor as a driving device, and in this case, the rotating motor 22, the driving roller 23, and the urging means 24 may be omitted.
The biasing means 24 may bias the unnecessary sheet collecting roller 21 in the direction of the driving roller 23 using a direct-acting motor as a driving device or a linear motor as a driving device, or may bias the unnecessary sheet collecting roller 21 in the vertical direction. The unnecessary sheet collecting roller 21 may be configured to be freely movable, and the unnecessary sheet collecting roller 21 may be urged in the direction of the drive roller 23 by its own weight.

The unnecessary sheet feeding means 30 may include a driving device that moves the roller member 31 away from and approaching the unnecessary sheet US, or the unnecessary sheet feeding means 30 may contact only the surface of the unnecessary sheet US that was temporarily attached to the release sheet RL, and return the roller member 31 to the collecting means 20. The unnecessary sheet US may be sent in the direction of the collecting means 20 in synchronization with the collecting operation of A configuration may also be adopted in which the unnecessary sheets US are sent in the direction of the collection means 20.
The unnecessary sheet feeding means 30 includes, for example, a first pulley 34 driven by a rotary motor 34A as a driving device, and a second pulley 35 that is freely rotatable, as shown in the diagram AA shown in the upper left of FIG. and a belt member 36 that is passed around the first pulley 34 and the second pulley 35. In this case as well, similarly to the embodiment described above, the unnecessary sheet US may be configured to be sandwiched between the belt members 36 and sent to the collection means 20 direction, or the unnecessary sheet US may be temporarily attached to the release sheet RL of the unnecessary sheet US. It may be configured such that the unnecessary sheet US is brought into contact with only the previously unused surface, and the unnecessary sheet US is sent in the direction of the collecting means 20 in synchronization with the collecting operation of the collecting means 20, as shown by the two-dot chain line in the figure AA in FIG. In this way, the belt member 36 is made of a porous material, and a suction chamber 37 having a suction surface 37A that can be suctioned by a decompression means (not shown) such as a decompression pump or a vacuum ejector is adopted, and the belt member 36 removes unnecessary sheets US. It may be configured such that the unnecessary sheet US is fed in the direction of the collection means 20 while being sucked and held, or the unnecessary sheet US shown in the figure AA in FIG. It may be used together with the feeding means 30.
The roller member 31 may have the same length as the width of the unnecessary sheet US, may be longer than the width of the unnecessary sheet US, or may be shorter than the width of the unnecessary sheet US.
The rotational force applying means may employ a rotational motor as a driving device that rotationally drives all the roller members 31 individually, or in the aspect of the embodiment described above, the rotational force applying means may temporarily attach to the release sheet RL in the unnecessary sheet US. The rotational force may be applied only to the roller member 31 that comes into contact with the side that was previously attached, or the rotational force may be applied only to the roller member 31 that comes into contact with the side that was not temporarily attached to the release sheet RL in the unnecessary sheet US. You may.
The driving force transmission means may be composed of gears, chains, or the like.

The pressing means 40 is used in common with the feeding means 10 instead of part or all of the linear motor 15A, slider 15B, support plate 15C, rotating motor 15D, pinch roller 15E, drive roller 15F, and release sheet collection roller 15G. Alternatively, a pressing member supported by the output shaft of a direct-acting motor serving as a driving device may press the original fabric RS onto the wafer WF from above the release sheet RL, and then apply the adhesive sheet AS to the wafer WF. Alternatively, the release sheet RL may be held by a holding member that is supported by the output shaft of a direct-acting motor as a driving device and can be held by suction by a pressure reducing means such as a pressure reducing pump or a vacuum ejector. A configuration may be adopted in which the release sheet RL held by the adhesive sheet AS is separated from the adhesive sheet AS and then peeled off.

The support means 50 may not have a holding means, may or may not bring the wafer WF into contact with the adhesive sheet AS when the table 52 is raised, or may be provided with other equipment. When supporting the wafer WF, the sheet pasting device EA1 does not need to be equipped with it.

In addition to the sheet pasting device EA1, the unnecessary sheet removing device EA is, for example, a raw material RS in which a plurality of adhesive sheets AS are temporarily attached to a strip-shaped release sheet RL at predetermined intervals, and there is no unnecessary sheet US. The present invention may be employed in any device such as a fabric manufacturing device that forms the fabric RS, a printing machine or printer that performs predetermined printing or printing on the adhesive sheet AS.
The unnecessary sheet US may be temporarily attached to the surface of the release sheet RL to which the adhesive sheet AS is temporarily attached, or may be temporarily attached to the surface of the release sheet RL to which the adhesive sheet AS is not temporarily attached. However, when the adhesive sheet AS of the release sheet RL is temporarily attached to the temporarily attached surface, it may be temporarily attached adjacent to the adhesive sheet AS so as not to overlap with the adhesive sheet AS, or the adhesive sheet AS may be temporarily attached to the adhesive sheet AS. It may be temporarily attached so as to be separated from the adhesive sheet AS so as not to overlap with AS, or it may be temporarily attached so as to overlap with adhesive sheet AS.

The materials, types, shapes, etc. of the adhesive sheet AS, unnecessary sheet US, and adherend in the present invention are not particularly limited. For example, the adhesive sheet AS may have a circular shape, an oval shape, a polygonal shape such as a triangle or a square shape, or other shapes, or may have an adhesive form such as pressure-sensitive adhesiveness or heat-sensitive adhesiveness. When a heat-sensitive adhesive sheet AS is used, the adhesive sheet AS may be bonded by an appropriate method such as providing a heating means such as an appropriate coil heater or heat pipe on the heating side to heat the adhesive sheet AS. In addition, such adhesive sheets AS include, for example, a single-layer adhesive sheet, one having a base material and an adhesive layer, one having an intermediate layer between the base material and the adhesive layer, etc. It may be a layer or two or more layers, or even a so-called double-sided adhesive sheet that allows the base material to be peeled off from the adhesive layer. It may be a single-layer or multi-layer without an intermediate layer. Examples of adherends include foods, resin containers, semiconductor wafers such as silicon semiconductor wafers and compound semiconductor wafers, circuit boards, information recording substrates such as optical disks, glass plates, steel plates, ceramics, wood plates, and resin plates. The object may be a single object or a composite formed of two or more of them, and members or articles of any form can also be targeted. Note that the adhesive sheet AS can be used for any purpose such as an information label, a decorative label, a protective sheet, a dicing tape, a die attach film, a die bonding tape, a recording layer forming resin sheet, etc. It may be any sheet, film, tape, etc. in any shape.

The means and steps in the present invention are not limited in any way as long as they can perform the operations, functions, or steps described with respect to the means and steps; It is not limited at all to the process. For example, if the feeding means is capable of feeding out a raw fabric in which a plurality of adhesive sheets and a belt-shaped unnecessary sheet are temporarily attached to a belt-shaped release sheet, then the technology should be There is no limitation as long as it falls within the range (descriptions of other means and steps will be omitted).
The driving equipment in the above embodiment includes a rotary motor, a direct-acting motor, a linear motor, a single-axis robot, an electric equipment such as an articulated robot with joints of two or three or more axes, an air cylinder, a hydraulic cylinder, and a rodless cylinder. Actuators such as cylinders and rotary cylinders can be used, and a direct or indirect combination of these can also be used.
In the above embodiment, when a rotating member such as a roller is employed, a driving device for rotationally driving the rotating member may be provided, or the surface of the rotating member or the rotating member itself may be made of deformable material such as rubber or resin. The surface of the rotating member or the rotating member itself may be made of a member that does not deform, or the pressing means such as a pressing roller or a pressing head or a pressing member that presses the object to be pressed may be used. If so, instead of or in combination with the examples listed above, members such as rollers, round bars, blade materials, rubber, resin, sponge, etc. may be used, or pressure may be applied by blowing air, gas, or other gases. The pressing member may be made of a deformable member such as rubber or resin, or may be made of a non-deformable member, or a release plate, a release roller, etc. If a peeling means or a peeling member is used to peel off the object to be peeled, members such as a plate-shaped member, a round bar, a roller, etc. may be used in place of or in combination with those exemplified above. Alternatively, the thing to be peeled off may be made of a deformable member such as rubber or resin, or it may be made of a non-deformable member, and the part to be peeled may be made of a deformable member such as a supporting (holding) means or a supported (holding) member. If something is used to support or hold the component, gripping means such as a mechanical chuck or chuck cylinder, Coulomb force, adhesive (adhesive sheet, adhesive tape), adhesive (adhesive sheet, adhesive tape), magnetic force, Bernoulli A configuration may be adopted in which the supported member is supported (held) by suction, suction suction, a driving device, etc., or the member to be cut is cut by a cutting means or a cutting member, or a cut or cutting line is formed in the member to be cut. If a device that forms a It is also possible to use a device that cuts the object with a spring, or to move the object to cut using a combination of appropriate drive equipment.If a biasing means is used, it may be possible to cut the object by moving it using a combination of appropriate drive equipment. It may also be made of resin or the like.

EA...Unnecessary sheet removing device 10...Feeding means 20...Collecting means 30...Unnecessary sheet feeding means 31...Roller member 32...Rotating motor (rotational force applying means)
34...First pulley 35...Second pulley 36...Belt member AS...Adhesive sheet PT1...Peeling start part PT2...Recovery start part RL...Peeling sheet RS...Original fabric US...Unnecessary sheet

Claims (2)

a feeding means for feeding out a raw fabric in which a plurality of adhesive sheets and a band-shaped unnecessary sheet are temporarily attached to a band-shaped release sheet;
a collection means for peeling off the unnecessary sheet from the release sheet and performing a predetermined collection operation to collect the unnecessary sheet;
Collecting the unnecessary sheets in synchronization with the collecting operation of the collecting means between a peeling start part where the unnecessary sheets are peeled from the release sheet and a collection start part where the unnecessary sheets are collected by the collecting means. Equipped with unnecessary sheet feeding means for feeding in the direction of the means,
The unnecessary sheet feeding means includes a plurality of roller members that sandwich the unnecessary sheet and curve the unnecessary sheet, and a rotational force applying means that applies rotational force to the plurality of roller members, and the plurality of roller members , an unnecessary sheet removing device characterized in that the unnecessary sheets are arranged in a staggered manner so as to be alternately positioned on one side and the other side of the unnecessary sheets. a feeding step of feeding out a raw fabric in which a plurality of adhesive sheets and a band-shaped unnecessary sheet are temporarily attached to a band-shaped release sheet;
a collection step of peeling off the unnecessary sheet from the release sheet and performing a predetermined collection operation with a collection means to collect the unnecessary sheet;
Collecting the unnecessary sheets in synchronization with the collecting operation of the collecting means between a peeling start part where the unnecessary sheets are peeled from the release sheet and a collection start part where the unnecessary sheets are collected by the collecting means. The unnecessary sheet feeding process is carried out in the direction of the means,
In the unnecessary sheet feeding step, the unnecessary sheet is sandwiched between a plurality of roller members arranged in a staggered manner so as to be alternately positioned on one side and the other side of the unnecessary sheet, thereby bending the unnecessary sheet. A method for removing unnecessary sheets, the method comprising: applying rotational force to the plurality of roller members while

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