Patent Publication Number: US-11377783-B2

Title: Device and method for cutting raw fabric

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national stage of International Application No. PCT/KR2016/007688, filed 14 Jul. 2016 the disclosures of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a device and method for cutting raw fabric and, more particularly, to a device and method for cutting a raw fabric that allows for cutting a stack of raw fabrics. 
     Related Art 
     Fabric treatment includes a design process for forming a predetermined pattern by determining a design and drawing or printing it on fabric, a fabric cutting process for cutting fabric in a pattern formed on the fabric, and a fabric sewing process for sewing the cut pieces of fabric. 
     Out of these processes, the fabric cutting process is a process in which a plurality of fabrics with a pattern on them are stacked upon one another and cut in that pattern. At this time, a cutting device is used for the fabric cutting process. Fabric is cut using the cutting device such as a razor, cutter blade, etc. 
     One of conventional cutting device is a device that includes a loom used to weave fabrics in order to cut the fabrics into regular-sized pieces without error, a frame with a cutting table, and a band cutter for horizontally cutting fabrics. When using this device, a stack of fabrics may be strewn due to stress applied from the band cuter in the process of cutting the stack of fabrics. This makes it difficult to cut fabrics accurately. In view of this, compressed fabric cutting technique may be applied. 
     Conventional compressed fabric cutting technique is a technique in which a stack of raw fabrics are placed inside a sealing member, an evacuation unit evacuates the inside of the sealing member to compress the stack of raw fabrics, and a cutting unit cuts the compressed fabrics while being transferred above the compressed fabrics. 
     However, in the conventional compressed fabric cutting technique, an open area is formed where the sealing member is exposed by cutting raw fabrics. Thus, the fabrics compressed inside the sealing member may inflate out of the sealing member through the open area. Therefore, the fabrics and the sealing member may move freely. As such, the free movement of the fabrics and the sealing member makes it difficult to cut the fabrics accurately. This problem will lead to serious errors in cutting fabrics, especially in a curved section. 
     SUMMARY OF THE INVENTION 
     The present invention provides a raw fabric cutting device that can effectively cut a stack of raw fabrics in a curved section, as well as in a linear section, by sealing an open area formed on a cover in real time. 
     An aspect of the present invention provides a raw fabric cutting device comprising: a support portion for supporting a raw fabric; a compressing portion for compressing the raw fabric by evacuating the space between a cover placed over the raw fabric and the support portion; a cutting portion that is transferred above the support portion and cuts the raw fabric; and a sealing portion that is transferred along with the cutting portion and feeds a sealing member to an open area of the cover to enclose the open area which is exposed as the raw fabric is cut, wherein the sealing member is formed with notches on at least one side, transversely to the direction of transfer of the sealing member. 
     The sealing member may comprise tape that sticks to the open area by adhesive power and is coated with an adhesive on one side. 
     The sealing member may have a width corresponding to the size of the notches. 
     Another aspect of the present invention provides a raw fabric cutting device comprising: a support portion for supporting a raw fabric; a compressing portion for compressing the raw fabric by evacuating the space between a cover placed over the raw fabric and the support portion; a cutting portion that is transferred above the support portion and cuts the raw fabric; and a sealing portion that is transferred along with the cutting portion and feeds a sealing member to an open area of the cover to enclose the open area which is exposed as the raw fabric is cut, wherein the sealing portion comprises a sealing member cutting portion for forming notches on at least one side of the sealing member, transversely to the direction of transfer of the sealing member. 
     The sealing member cutting portion may form notches with a predetermined spacing on at least one side of the sealing member, transversely to the direction of transfer of the sealing member. 
     The sealing member cutting portion may form notches on opposite sides of the sealing member, transversely to the direction of transfer of the sealing member, in such a manner that the spacing between notches on a first side and the spacing between notches on a second are different from each other. 
     The sealing member cutting portion may form notches with a predetermined spacing in a face-to-face manner on opposite sides of the sealing member. 
     The sealing member cutting portion may form notches with a first spacing on either side of the sealing member, wherein the notches are formed in a staggered manner on opposite sides of the sealing member such that those on one side have a second spacing from the corresponding ones on the other side. 
     The width of the notches at at least one side of the sealing member may be equal to or greater than the width of the notches near the center of the sealing member. 
     The shape of the notches may comprise at least one of linear, triangular, rectangular, pentagonal, and semicircular shapes. 
     The raw fabric cutting device may further comprise a link portion connecting the cutting portion and the sealing portion, the link portion comprising: a first link configured at the rear of the cutting portion relative to the direction of transfer of the cutting portion; a second link configured at the foremost part of the sealing portion so as to correspond to the first link; and a link pin fastened to the first and second links so that the sealing portion rotates along with the cutting portion. 
     The sealing portion may comprise: a main body inside which the sealing member is supported; a reel around which the sealing member is wound; a guide roller positioned over an outlet at the bottom of the main body so as to draw the sealing member out of the main body from the reel; and a pressure roller that is supported on the main body and presses the sealing member, drawn down to the outlet by the guide roller, to the open area. 
     The sealing portion may further comprise a pressure roller support that supports the pressure roller from the main body, the pressure roller support comprising: a stationary portion supported on the main body; a movable portion that supports the pressure roller and slides from the stationary portion; and an elastic body that is placed between the stationary portion and the movable portion and elastically supports the movable portion from the stationary portion. 
     The sealing member cutting portion may comprise: a cutter transfer portion attached to the main body; and a cutter that is connected to the cutter transfer portion and forms notches on the sealing member. 
     The cutter may form notches on the sealing member between the guide roller and the pressure roller. 
     The cutter may form notches on the sealing member between the reel and the guide roller. 
     The cutter may comprise one blade and forms notches on the sealing member by reciprocating movement. 
     The sealing member cutting portion may further comprise a support that is positioned on the other side of the cutter, with the sealing member in between, and supports the sealing member when the sealing member is cut. 
     The cutter may comprise a top blade and a bottom blade, and forms notches on the sealing member as the top blade and the bottom blade engage. 
     The cutter transfer portion may transfer the cutter either transversely or longitudinally to the direction of transfer of the sealing member to allow the cutter to form notches. 
     The raw fabric cutting device may further comprise a sealing member separating portion that is located at the bottom of the main body, opposite to the direction of transfer relative to the pressure roller, and completely cuts and separates the sealing member. 
     The raw fabric cutting device may further comprise a controller that controls the cutting portion and the sealing portion by a raw fabric cutting program, wherein the controller calculates a cutting line by parsing the raw fabric cutting program and controls the sealing member cutting portion along the calculated line. 
     The controller may control the sealing member cutting portion to extract a curved section from the calculated line and form the notches in the extracted curved section. 
     The controller may determine the spacing between notches formed on at least one side of the sealing member according to the curvature of the extracted curved section. 
     The controller may determine the shape of notches formed on at least one side of the sealing member according to the curvature of the extracted curved section. 
     The controller may determine the central angle of triangular notches formed on at least one side of the sealing member according to the curvature of the extracted curved section. 
     Still another aspect of the present invention provides a raw fabric cutting method comprising: compressing a raw fabric by evacuating the space between a cover placed over the raw fabric and a support portion for supporting the raw fabric; cutting the raw fabric by using a cutting portion being transferred above the support portion; and feeding a sealing member by a sealing portion to an open area of the cover to enclose the open area which is exposed as the raw fabric is cut, the sealing portion being transferred along with the cutting portion, wherein the sealing comprises forming notches on at least one side, transversely to the direction of transfer of the sealing member. 
     The raw fabric cutting method may further comprise controlling the cutting portion and the sealing portion by a raw fabric cutting program, the controlling comprising: calculating a cutting line by parsing the raw fabric cutting program; extracting a curved section from the calculated line; calculating the curvature of the extracted curved section; and forming notches according to the calculated curvature. 
     The forming of notches may comprise determining parameters related to notches formed on at least one side of the sealing member according to the curvature of the extracted curved section. 
     One advantage of a raw fabric cutting device according to an aspect of the present invention is that the fabrics can be cut precisely by sealing, in real time, the open area formed on the cover in a raw fabric cutting process, thereby improving the quality of cut fabrics. 
     Another advantage of a raw fabric cutting device according to an aspect of the present invention is that a stack of raw fabrics can be cut in a curved section, as well as in a linear section, without being strewn, thereby improving the productivity of fabric treatment. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a raw fabric cutting device according to an exemplary embodiment of the present invention. 
         FIG. 2  is a cross-sectional view taken along the line of  FIG. 1  from the raw fabric cutting device according to an exemplary embodiment of the present invention. 
         FIG. 3  is a perspective view of a structure connecting the cutting portion and the sealing portion according to an exemplary embodiment of the present invention. 
         FIG. 4  is a conceptual diagram illustrating the occurrence of a defect at the sealing portion in a curve-cutting section and the formation of a notch for eliminating the defect. 
         FIG. 5A  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a first exemplary embodiment of the present invention. 
         FIG. 5B  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a second exemplary embodiment of the present invention. 
         FIG. 6  is a cross-sectional view taken along the line VII-VII′ of  FIG. 5A  from the sealing portion according to the first exemplary embodiment of the present invention. 
         FIG. 7A  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a third exemplary embodiment of the present invention. 
         FIG. 7B  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a fourth exemplary embodiment of the present invention. 
         FIG. 8  is a view of the shapes of notches formed on the sealing member for a curved section of a raw fabric cutting device according to an exemplary embodiment of the present invention. 
         FIG. 9  is a view of the shapes of notches formed on the sealing member for a curved section of a raw fabric cutting device according to another exemplary embodiment of the present invention. 
         FIG. 10  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing member separating portion of the raw fabric cutting device according to an exemplary embodiment of the present invention. 
         FIG. 11  is a cross-sectional view of a raw fabric cutting device upon completion of one cutting process, according to an exemplary embodiment of the present invention. 
         FIG. 12  is a block diagram schematically showing a raw fabric cutting device which controls components according to a raw fabric cutting program, according to an exemplary embodiment of the present invention. 
         FIG. 13  is a detailed flowchart showing in detail a process in which a raw fabric cutting device forms notches along a curved line according to a raw fabric cutting program, according to an exemplary embodiment of the present invention. 
         FIG. 14  is a conceptual diagram for explaining how a curved section is extracted from an analyzed, preliminary cutting line and the spacing between notches and the shape of notches are determined according to the curvature of the extracted curved section. 
         FIG. 15  is a cross-sectional view of a raw fabric cutting device where a sealing member with notches is loaded according to still another exemplary embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     The present disclosure may be modified in various ways and may include various embodiments. Specific exemplary embodiments will be illustrated in the drawings and described in detail. 
     It is however to be understood that the present disclosure is not intended to be limited to the specific embodiments but the specific embodiments include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the present disclosure. 
     It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element may be termed a second element and a second element may be termed a first element without departing from the teachings of the present disclosure. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected” or “directly coupled” to another element, there are no intervening elements present. 
     The terms used herein are used merely to describe specific embodiments, but are not intended to limit the present invention. The singular expressions used herein include plural expressions unless explicitly stated otherwise in the context thereof. It should be appreciated that in this application, the use of the terms “include(s),” “comprise(s)”, “including” and “comprising” is intended to denote the presence of the characteristics, numbers, steps, operations, elements, or components described herein, or combinations thereof, but is not intended to exclude the probability of presence or addition of one or more other characteristics, numbers, steps, operations, elements, components, or combinations thereof. 
     Unless defined otherwise, all the terms used herein have the same meanings as typically understood by those having ordinary skill in the art. The terms, such as ones defined in common dictionaries, should be interpreted to have the same meanings as terms in the context of pertinent technology, and should not be interpreted to have ideal or excessively formal meanings unless clearly defined in the specification. 
     Exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the following description of the present disclosure, in order to help a general understanding of the present disclosure, the same reference numerals will be used to denote the same elements throughout the drawings, and redundant descriptions of the same elements will be omitted. 
       FIG. 1  is a perspective view of a raw fabric cutting device according to an exemplary embodiment of the present invention.  FIG. 2  is a cross-sectional view taken along the line of  FIG. 1  from the raw fabric cutting device according to an exemplary embodiment of the present invention. 
     Referring to  FIGS. 1 and 2 , the raw fabric cutting device  100  according to the present exemplary embodiment includes a support portion  110 , a compressing portion  120 , a transfer portion  130 , a cutting portion  140 , and a sealing portion  150 . 
     First of all, a stack of raw fabrics  10  (hereinafter, referred to as fabrics) and a cover  30  are placed one on top of the other. In this case, the cover  30  placed over the fabrics  10  may be made from transparent resin such as vinyl that covers a wider area than the fabrics  10 . 
     The support portion  110  may include a plate  111  and a plurality of frames  113 . The plate  111  helps evenly support the fabrics  10  and the cover  30 . The plurality of frames  113  are placed under the plate  111  and support the plate  111 . 
     As the fabrics  10  are supported on the plate  111  and the cover  30  is seated over the fabrics  10  while covering a wider area than the fabrics  10 , a space created from the fabrics  10  is formed between the topside of the plate  111  and the underside of the cover  30 . Here, the compressing portion  120  evacuates the space between the plate  111  and the cover  30  to compress the fabrics  10 . 
     The compressing portion  120  includes a vacuum pump  121  and a control valve  123 . 
     The vacuum pump  121  is connected to a plurality of evacuation holes  111   a  formed in the plate  111 . The vacuum pump  121  allows the fabrics  10  and the cover  30  to tightly adhere to the plate  111  by evacuating the space between the plate  111  and the cover  30 . In this instance, the fabrics  10  are compressed between the plate  111  and the cover  30  by a force applied by the cover  30  adhering tightly to the plate  111 . The control valve  123  may be located between the evacuation holes  111  and the vacuum pump  121 . The control valve  123  controls the vacuum pump&#39;s evacuation force applied between the plate  111  and the cover  30 . 
     Meanwhile, the transfer portion  130  transfers the cutting portion  140  and the sealing portion  150  in a flat plane above the plate  111 . The transfer portion  130  includes first and second linear actuators  131  and  133 . 
     The first linear actuator  131  may be located on the outer side of the plate  111 . The first linear actuator  131  transfers the second linear actuator  133  connected to the top along the x axis. The second linear actuator  133  transfers the cutting portion  140  connected to one side along the y axis. Here, the first and second linear actuators  131  and  133  may be implemented by a combination of a rack and a pinion, a combination of a linear guide and a linear motor, and a hydraulic/pneumatic cylinder. 
     Meanwhile, the cutting portion  140  is supported on the second linear actuator  133  so as to rotate with respect to the plate  111  in the planar direction. The sealing portion  150  is connected to one side of the cutting portion  140  (see  FIG. 4 ). As such, the sealing portion  150  may be transferred along with the cutting portion  140 . Here, a detailed description of the cutting portion  140  will be omitted since it is well known in the art, and the sealing portion  150  will be described below in detail. 
       FIG. 3  is a perspective view of a structure connecting the cutting portion and the sealing portion according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 3 , the cutting portion  140  and sealing portion  150  according to the present exemplary embodiment are connected by a link portion  160 . 
     The link portion  160  may include first and second links  161  and  163  and a link pin  165 . 
     The first link  161  is provided at the rear of the cutting portion  140  relative to the direction of transfer of the cutting portion  140 . The second link  163  is provided at the foremost part of the sealing portion  150  facing the rear of the cutting portion  140 . The first and second links  161  and  163  are joined together by an interlink pin  165  so that the sealing portion  150  behind the cutting portion  140  is transferred along with the cutting portion  140  and rotates freely on the cutting portion  140 . 
       FIG. 4  is a conceptual diagram illustrating the occurrence of a defect at the sealing portion in a curve-cutting section and the formation of a notch for eliminating the defect. 
     Referring to (a) of  FIG. 4 , the cutting portion  140  cuts a fabric along a cutting line  400 , and the sealing portion  150  behind the cutting portion  140  seals an open area of the cover  30  as it follows the cutting portion  140 . In this case, there is no problem in sealing the open area in a linear section, but there might be a problem in a curved section. That is, as shown in  FIG. 3 , even if the sealing portion  150  connected to the cutting portion  140  via the link portion  160  seals the open area along with the rotation of the cutting portion  140 , a sealing defect may be created as a sealing member  50  becomes crumpled. The open area of the cover  30  may not be completely enclosed, especially at a defective portion formed by the crumpling of the sealing member  50 , which may lead to problems in compressing the fabric through the cover  30 . This may cause the fabric to inflate, thereby leading to a failure to cut the fabric accurately. This phenomenon will become more serious as the curvature of a curved section becomes larger. In some cases, the sealing member  50  may not be attached to the cover  30  at all or may be broken. 
     To make up for this problem, according to an exemplary embodiment of the present invention, notches  410  and  420  may be formed on the sealing member  50 . The notches  410  and  420  may be formed on opposite edges, transversely to the direction of transfer of the sealing member  50 . The sealing member  50  may be broken at some parts through the notches  410  and  420 , and the broken parts may be stretched on the outer side of the curved section and contracted on the inner side, thereby preventing the sealing member  50  from getting crumpled too much and enabling smooth sealing. 
     As such, the notches  410  and  420  formed on opposite edges of the sealing member  50  may come in various shapes. Also, the notches  410  and  420  may have different shapes. For example, the notches  410  formed on the outer side of the curved section may be larger in width, and the notches  420  formed on the inner edge may be smaller in width than the notches  410 . Moreover, the notches  410  and  420  may have various shapes, such as linear, triangular, rectangular, pentagonal, semicircular, etc., and the spacing between the notches may vary with the curvature of the curved section. 
       FIG. 5A  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a first exemplary embodiment of the present invention. 
     Referring to  FIG. 5A , the sealing portion  150  may include a main body  151 , a reel  152 , a guide roller  153 , a pressure roller  154 , a pressure roller support  155 , a sealing member cutting portion (including a cutter transfer portion  170 , and a cutter  172 , and a supporting base  174 ). 
     The main body  151  forms the exterior of the sealing portion  150 , and the second link  163  is coupled to the foremost part of the main body  151 . A roll-shaped sealing member  50  may be located within the main body  151 . The sealing member  50  is supported by being wound around the reel  152  located within the main body  151 . The sealing member  50  may be drawn out of the main body  151  through an outlet  151   a  opening down from the main body  151  and fed to the open area. 
     Here, the sealing member  50  may be in the form of film or tape coated with adhesive on one side. If the sealing member  50  is a film, it may be adsorbed onto the open area by the evacuation force of the vacuum pump  121  which evacuates the space between the plate  111  and the cover  30 . On the other hand, if the sealing member  50  is in the form of film, it may be adsorbed more strongly onto the open area by the evacuation force of the vacuum pump  121  and the adhesive power of the adhesive. 
     Meanwhile, the guide roller  153  is located in the main body  151  and guides the sealing member  50  to be drawn out. That is, the guide roller  153  may be located close to the outlet  151   a . The guide roller  153  guides the sealing member  50  from the reel  152  down to the open area. Also, the guide roller  153  prevents the sealing member  50  from becoming damaged by friction by keeping the sealing member  50  from coming into contact with the main body  151  when drawn out. The guide roller  153  is positioned further to the direction of transfer than the sealing member cutting portion  170 , so that the cutting of the sealing member  50  is done in the space between the guide roller  153  and the reel  152 . In this instance, the cutting of the sealing member may mean the formation of notches. 
     Meanwhile, the pressure roller  154  is supported by the pressure roller support  155  at the bottom of the main body  151 . The pressure roller  154  presses the sealing member  50  being drawn down from the main body  151 . Here, the pressure roller support  155  supporting the pressure roller  154  may slide and expand when the pressure roller  154  presses the sealing member  50 . 
     The pressure roller support  155  may include a stationary portion  155   a , a movable portion  155   b , and an elastic body  155   c.    
     The stationary portion  155   a  is fitted to the underside of the main body  151 . The inside of the stationary portion  155   a  is formed with a space in which the top edge of the movable portion  155   b  can be inserted and lifted. Also, a ridge is formed at the bottom edge of the stationary portion  155   a  to prevent the top edge of the movable portion  155   b  from falling out from the stationary portion  155   a . The top edge of the movable portion  155   b  is inserted into the stationary portion  155   a  and supported on it. Thus, the movable portion  155   b  may be lifted towards the internal space of the stationary portion  155   a  and cause the pressure roller  154  supported at the bottom to be lifted. The elastic body  155   c  is placed around the movable portion  155   b  between the stationary portion  155   a  and the pressure roller  154 . The elastic body  155   c  produces a repulsive force between the stationary portion  155   a  and the pressure roller  154 . 
     Hence, the movable portion  155   b  may be lifted up by a stress provided by the pressure roller  154 , or may be lifted down by a repulsive force provided by the elastic body  155   c.    
     Therefore, when the pressure roller  154  presses the sealing member  50 , the pressure roller support  155  may be lifted along a curve formed in the open area and relieve the stress applied to the open area from the pressure roller  154 . 
     As such, the sealing portion  150  behind the cutting portion  140  encloses the open area of the cover  30 , along the path through which the cutting portion  140  passes. In view of this, the sealing portion  150  is advantageous in that it enables precise cutting of the fabrics  10  by preventing the fabrics  10  from being inflated and moved through the open area. 
     According to an exemplary embodiment of the present invention, the sealing member cutting portion may include a cutter transfer portion  170  cutter  172 , and a supporting base  174 . The cutter transfer portion  170  is fitted to the top or side of the main body. The cutter transfer portion  170  may include a hydraulic/pneumatic cylinder or a drive motor. Hence, the cutter transfer portion  170  may vertically reciprocate or rotate the cutter  172  connected to one side under control of a controller (not shown). Therefore, it is possible to form notches by cutting at least one edge of the sealing member  50  stretched between the guide roller  153  and the reel  152 . The cutter  172  may be provided at a position on the cutter transfer portion  170  where the cutter  172  forms notches on at least one side of the sealing member  50 , transversely to the direction of transfer. 
     The cutter  172  may have a blade that comes in a variety of shapes so as to correspond to notches of various shapes. The blade may be linear, triangular, rectangular, pentagonal, semicircular, etc. Also, the cutter  172  may have a plurality of blades and change them with one another for a suitable shape. 
     Moreover, the supporting base  174  may be provided to form more precise notches. The supporting base  174  is formed on the inside bottom of the main body  151 . The supporting base  174  prevents the sealing member  50  from getting stretched too much by supporting the sealing member  50  when the sealing member  50  is cut by the vertical movement of the cutter  172 . The supporting base  174  may be designed to be raised as the sealing member  50  is raised from under the main body  151  with the use of the sealing member  50 . 
       FIG. 5B  is a cross-sectional view taken, along the line V-V′ of  FIG. 3  from the sealing portion according to a second exemplary embodiment of the present invention. 
     Referring to  FIG. 5B , the sealing member cutting portion may include a first cutter transfer portion  180 , a first cutter  182 , a second cutter transfer portion  184 , and a second cutter  186 . As in the first exemplary embodiment of  FIG. 5A , the first cutter transfer portion  180  may be fitted to the top or side of the main body  151  and vertically reciprocate or rotate the cutter  182  connected to one side. 
     The second cutter transfer portion  184  may be fitted to the bottom of the main body  151  and vertically reciprocate or rotate the cutter  186  connected to one side. The second cutter transfer portion  184  may transfer the cutter  186  at the same point in time as the first cutter transfer portion  180 . Thus, the blade of the first cutter  182  positioned in the upper part and the blade of the second cutter  186  positioned in the lower part may engage, thereby forming notches on at least one side of the sealing member  50 . 
     According to another exemplary embodiment of the present invention, the first cutter  182  and the second cutter  186 , configured to work the same as a nail clipper, may be riveted at one end, with a fixed axis (not shown) being inserted into the other end. Thus, a pressure plate (not shown), situated on top of a body (not shown) supporting the cutters  182  and  186 , is coupled to the fixed axis, so that the first cutter  182  and second cutter  186  of the body engage by the pressure of the pressure plate. 
       FIG. 6  is a cross-sectional view taken along the line VII-VII′ of  FIG. 5A  from the sealing portion according to the first exemplary embodiment of the present invention. 
     Referring to (a) of  FIG. 6 , the cutter transfer portion  170  may have two cutters  172   a  and  172   b  above two ends of the sealing member  50 . Thus, the sealing member  50  may be cut on the supporting base  174  by the vertical movements of the two cutters  172   a  and  172   b , thereby forming notches. 
     The cutter transfer portion  170  may control the two cutters  172   a  and  172   b  in such a way that only one of them is transferred. That is, only the cutter  172   b  may be transferred, but not the cutter  172 , or vice versa. In this instance, as described previously, the cutters  172   a  and  172   b  for forming notches on opposite edges of the sealing member  50  may vary in shape. That is, the cutters  172   a  and  172   b  may include a normal blade, a triangular blade, a rectangular blade, a circular blade, etc., and the cutters  172   a  and  172   b  may have different shapes. That is, the cutter  172   a  may have a triangular blade, whereas the cutter  172   b  may have a rectangular blade. Also, they may have a number of triangular blades having different central angles. 
     Referring to (b) of  FIG. 6 , the cutter transfer portion  170  may have one cutter  172  above the sealing member  50 . The cutter  172  may be configured to move up and down or left and right. Therefore, the cutter  172  may form notches by cutting one side of the sealing member  50  by its up-and-down movement, and then move to the other side by its left-and-right movement and form notches by cutting the other side of the sealing member  50 . This way, the cutter  172  may form notches on opposite edges of the sealing member  50  by its zigzag movement. 
     According to another exemplary embodiment of the present invention, linear notches, polygonal notches, semicircular notches, etc. may be formed as one blade is transferred. That is, the one blade may be set at an oblique angle to the supporting base, and linear notches, polygonal notches, and/or semicircular notches may be formed freely by the movement of the blade. In this case, notches may be formed in a preset shape or in response to a notch formation-related control signal. Notches of specific shapes may be formed by varying the width, central angle, and spacing on the two edges and center of the sealing member. 
       FIG. 7A  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a third exemplary embodiment of the present invention. 
     Referring to  FIG. 7A , the cutter transfer portion  190  is fitted to the underside of the main body  151 . The cutter transfer portion  190 , too, may be provided as a hydraulic/pneumatic cylinder or a drive motor. Thus, the cutter transfer portion  190  may reciprocate the cutter  191  connected to one side between the guide roller  153  and the pressure roller  154  or rotate the cutter  192  between the guide roller  153  and the pressure roller  154 . 
     Therefore, notches may be formed on at least one side of the sealing member  50  which is stretched between the pressure roller  154  pressing the sealing member  50  to the open area. 
     As stated previously, the cutter  192  may a blade that comes in a variety of shapes. 
     Moreover, a supporting base  194  may be provided at the bottom of the main body  151 , opposite to the direction of transfer relative to an outlet at the bottom. The supporting base  194  may be formed on the outside bottom of the main body  151  and support the sealing member  50  when the sealing member  50  is cut by the reciprocating movement of the cutter  194 . 
       FIG. 7B  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing portion according to a fourth exemplary embodiment of the present invention. 
     Referring to  FIG. 7B , the sealing member cutting portion may include a first cutter transfer portion  200 , a first cutter  202 , a second cutter transfer portion  204 , and a second cutter  206 . As in the first exemplary embodiment of  FIG. 7A , the first cutter transfer portion  200  may be fitted to the bottom of the main body  151  and vertically reciprocate or rotate the cutter  202  connected to one side. 
     The second cutter transfer portion  204  may be fitted to the bottom of the main body  151  on the opposite side to an outlet at the bottom and horizontally reciprocate or rotate the cutter  206  connected to one side. In this instance, the second cutter  206  may be controlled in such a manner as to be transferred at the same timing as the first cutter  202 . Thus, the blade of the first cutter  202  positioned in the direction of transfer and the blade of the second cutter  206  positioned on the opposite side may engage, thereby forming notches on at least one side of the sealing member  50 . 
     According to another exemplary embodiment of the present invention, the first cutter  202  and the second cutter  206  may work the same as a nail clipper. 
       FIG. 8  is a view of the shapes of notches formed on the sealing member for a curved section of a raw fabric cutting device according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 8 , the raw fabric cutting device according to an exemplary embodiment of the present invention may form notches in a variety of shapes. The shape of the notches largely includes at least one among linear, triangular, semicircular, pentagonal, and rectangular shapes. 
     Referring to (a) of  FIG. 8 , linear notches may be formed face-to-face on opposite edges of the sealing member  50 . The linear may refer to a shape that is formed on both side edges of the sealing member  50  and runs a certain length towards the center of the sealing member  50 . In this instance, the length of the linear notches or the spacing between the linear notches may be adjusted according to the curvature of the curved section. The linear notches do not necessarily have to be formed in a direction perpendicular to both side edges of the sealing member  50 , but may be formed in an oblique direction as long as the sealing member  50  is transferred transversely. 
     Referring to (b) of  FIG. 8 , triangular notches may be formed. The notches may be formed face-to-face on opposite edges of the sealing member  50 , transversely to the direction of transfer. Each triangular notch includes a face  810  formed on either side edge of the sealing member  50  and one vertex  820  pointing toward the center of the sealing member  50 . The face  810  may be larger in width than the vertex  820 . This also applies to notches of other shapes, and the longitudinal width of the notches at the edges of the sealing member  50  may be equal to or greater than the width of the notches near the center of the sealing member  50 . For triangular notches, the central angle of the triangles may vary. That is, acute triangular notches having a central angle of 90 degrees or more and/or obtuse triangular notches having a central angle of 90 degrees or more may be formed. In this case, the central angle of the triangles may be determined according to the curvature of the curved section. This will be described in further detail below with reference to  FIG. 14 . 
     Referring to (c) of  FIG. 8 , semicircular notches may be formed. The semicircular notches, too, may be formed face-to-face on opposite edges of the sealing member  50 . The spacing between the semicircular notches may be determined according to the size of the semicircles dependent on their radius. Moreover, the notches do not necessarily have to be semicircular but may be oval. 
     Referring to (d) of  FIG. 8 , polygonal notches may be formed. Here, the polygonal may include square, rectangular, trapezoidal, pentagonal, hexagonal, etc. Likewise, it is desirable that the width of the notches at the edges of the sealing member  50  may be equal to or greater than the width of the notches near the center of the sealing member  50 . 
     According to another exemplary embodiment of the present invention, the notches do not necessarily have to be formed on both sides but may be formed only on one side. 
       FIG. 9  is a view of the shapes of notches formed on the sealing member for a curved section of a raw fabric cutting device according to another exemplary embodiment of the present invention. 
     Referring to (a) through (d) of  FIG. 9 , notches may be formed in a staggered manner on opposite edges of the sealing member  50  such that those on one side have a given spacing from the corresponding ones on the other side. 
     Notably, referring to (b) of  FIG. 9 , notches may be formed in a staggered manner on opposite edges of the sealing member  50  in such a way that the notches on the left side edge of the sealing member  50  have a first spacing  910  from the corresponding ones on the right side edge of the sealing member  50 . In this case, the notches on the same side may have a second spacing  920  between them, so that the notches on opposite edges of the sealing member  50  are set parallel to each other in a staggered formation. 
     Referring to (e) of  FIG. 9 , the spacing between the notches on one side of the sealing member  50  and the spacing between the notches on the other side of the sealing member  50  may be different from each other. For example, those on one side of the sealing member  50  may have a wide spacing of 2 cm or more, whereas those on the other side of the sealing member  50  may have a narrow spacing of 0.5 cm or less. Hence, the notches on the outer side of a curve toward a particular direction allow for snug attachment of the sealing member  50  in a linear section between notches because of the wide spacing between them, whereas the notches on the inner side of the curve allow for proper attachment of the sealing member  50  in a linear section between notches because of the narrow spacing between them, in case the curvature of the curve is larger. However, it is not necessary for the curve to have wide spacing between notches on the outer side and narrow spacing between notches on the inner side, but vice versa is possible. 
     Referring to (f) of  FIG. 9 , it is possible to arbitrarily adjust which side of the sealing member  50  has narrow spacing between notches and which side of the sealing member  50  has wide spacing between notches, according to the user settings. Moreover, the sealing member  50  may be divided into sections so that one side of the sealing member  50  has relatively narrow spacing in a certain section and the other side of the sealing member  50  has relatively narrow spacing in another section. 
       FIG. 10  is a cross-sectional view taken along the line V-V′ of  FIG. 3  from the sealing member separating portion of the raw fabric cutting device according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 10 , the sealing member separating portion is positioned opposite to the direction of transfer relative to the pressure roller  154 . The sealing member separating portion is located at the bottom of the main body  151  and completely cuts and separates the sealing member  50 . The sealing member separating portion may include a cutter transfer portion  210  and a cutter  212 . 
     The cutter transfer portion  210  may be provided as a hydraulic/pneumatic cylinder or a drive motor and cut the sealing member  50  attached on the cover  30  by reciprocating or rotating the cutter  212  connected to one side. In this case, the transfer width of the cutter needs to be precisely adjusted so as to keep the cutter  212  from getting to the cover  30  or fabrics  10  beneath the sealing member  50 . 
     Moreover, the pressure roller  154  may include at least one guide  156  for guiding the sealing member  50  so as to keep it from getting away from the pressure roller  154 . As a part of the sealing member  50  that is completely separated and hanging in the air is moved away from the pressure roller  154  by the guide  156 , it is possible to avoid the risk of failing to perform the next sealing operation, which can occur when no part of the sealing member  50  is left that is to be cut next and attached by the pressure of the pressure roller  154 . That is, once the cutting of one seamless cutting line is completed, the sealing member cutting portion may completely cut the sealing member  50 , and the pressure roller  154  may be lifted. In this instance, the sealing member  50  moves towards the next cutting line by the guide  156  of the pressure roller  154  which is being lifted, while seated on the bottom of the pressure roller  154  without getting away from the guide  156 . 
       FIG. 11  is a cross-sectional view of a raw fabric cutting device according to an exemplary embodiment of the present invention upon completion of one cutting process. 
     Referring to  FIG. 11 , the raw fabric cutting device according to an exemplary embodiment of the present invention allows the stack of raw fabrics  10  and the cover  30  to be seated on top of the plate  111 . The stack of raw fabrics  10  are seated on top of the plate  111  first, and then the cover  30  is placed over the fabrics  10 . The cover  30  may be made from transparent resin such as vinyl that covers a wider area than the fabrics  10 . Thus, a predetermined pattern formed on the fabrics  10  may be projected on the cover  30 . 
     Afterwards, the cutting portion  140  and the sealing portion  150  may be transferred to the top of one area of the fabrics  10  that is to be cut first. In this instance, the first linear actuator  131  transfers the cutting portion  140  in the x-axis direction, and the second linear actuator  133  transfers the cutting portion in the y-axis direction, so that the cutting portion  140  is transferred in a flat plane above the fabrics  10 . Here, one end of the sealing member  50  contained inside the sealing member may be drawn out of the sealing member  140  and placed adjacent to the cover  30 . 
     When the cutting portion  140  and the sealing portion  150  are transferred to the top of one area of the fabrics  10  that is to be cut first, the control valve  123  is opened, and the vacuum pump  121  evacuates the space between the plate  111  and the cover  30  via the plurality of evacuation holes  111   a  formed in the plate  111 . Hence, the fabrics  10  placed between the plate  111  and the cover  30  are compressed between the plate  111  and the cover  30  by the pressure of the cover  30  attached firmly to the plate  111 . In this instance, the evacuation force applied between the plate  111  and the cover  30  may be controlled by opening or closing the control valve  123 . 
     Afterwards, when the fabrics  10  are compressed, then the cutting portion  140  and the sealing portion  150  may be transferred together by the transfer portion  130  and perform cutting and sealing operations in real time. In this instance, the cutting portion  140  and the sealing portion  150  may perform cutting and sealing operations as they are transferred along the pattern formed on the fabrics  10  or in a preset direction. 
     As for the process of cutting the fabrics  10 , the cutting portion  140  is transferred first, and then performs the cutting of the fabrics  10 . Thus, an open area is formed on the cover  30 . Next, the sealing portion  150  transferred following the rear of the cutting portion  140  rotates freely relative to the cutting portion  140  by means of the link portion  160 , and seals the open area of the cover  30  formed by the cutting portion  140  (S 500 ). Here, one end of the sealing member  50  drawn out from the sealing portion  150  and placed adjacent to the cover  40  may be adsorbed to the open area by the evacuation force of the vacuum pump  121 . 
     Afterwards, the sealing member  50  is drawn out of the sealing portion  150  as the cutting portion  140  and the sealing portion  150  are transferred, and the open area formed along the path through which the cutting portion  140  passes is enclosed. In this instance, the sealing member may be drawn out from the sealing portion  150  by a drive motor (not shown), or may be drawn out as the sealing portion  150  is transferred while one area of the sealing member is adsorbed to the open area. In this case, the sealing portion  150  enables sealing without a break or crumple in a curved section by forming notches on at least one side of the sealing member  50 . 
     Moreover, the pressure roller  154  is transferred over the open area, and presses the sealing member  50 . In this instance, the pressure roller support  155  expands and contracts along a curve in the open area so as to prevent the movement of the cover  30  due to the stress applied to the cover  30  from the pressure roller  154 . This prevents the fabrics  10  from being strewn due to the stress applied to the cover  30 . 
     Afterwards, the cutting of the fabrics  10  is completed, the cutting portion  140  stops being transferred and discontinues cutting. At this point, the vacuum pump  121  may have stopped evacuating the space between the plate  111  and the cover  30 . The cutter  212  of the sealing member separating portion cuts the sealing member  50  which is fed to the open area by the cutter transfer portion  210  in a direction opposite to the direction of transfer relative to the pressure roller  154 . After completion of the cutting operation, one area  55  of the sealing member remains. If a part of the sealing member  50  is planned to be cut at the next position, the pressure roller  154  may be moved, with part  55  of the sealing member  50  attached to it, and perform cutting and sealing operations. 
     While one exemplary embodiment of the present invention has been described with an example in which the cutting portion  140  and the sealing portion  150  are provided as separate components and transferred together, the cutting portion  140  and the sealing portion  150  may be integrated together. Moreover, although the present exemplary embodiment has been described with an example in which a stack of raw fabrics  10  are placed beneath the cover  30 , the cover  30  may be provided as an enclosed member and the stack of raw fabrics  10  may be compressed while contained within the cover  30 , as shown in  FIG. 1 . 
     Additionally, although the present exemplary embodiment has been described with an example in which the cutting portion  140  and the sealing portion  150  work simultaneously, the cutting portion  140  and the sealing portion  150  may be run individually depending on the process. 
       FIG. 12  is a block diagram schematically showing a raw fabric cutting device which controls components according to a raw fabric cutting program, according to an exemplary embodiment of the present invention. As shown in  FIG. 12 , the raw fabric cutting device according to an exemplary embodiment of the present invention may include a controller  1210 , a compressing portion  1220 , a transfer portion  1230 , a cutting portion  1240 , and a sealing portion  1250 . 
     Referring to  FIG. 12 , the controller  1210  is configured as a hardware processor, and includes a microprocessor capable of executing instructions. The controller  1210  may control at least one among the compressing portion  1220 , transfer portion  1230 , cutting portion  1240 , and sealing portion  1250  by receiving a raw fabric cutting program. Here, the raw fabric cutting program may define a raw fabric cutting path and the components&#39; operations for cutting. That is, the raw fabric cutting program may be a coded program that includes an algorithm for controlling the components so that cutting is done along the raw fabric cutting path. The raw fabric cutting program may be inputted directly by the user over a user interface, such as a mouse, keyboard, etc., or may be received from other devices. Alternatively, program data stored on a USB (universal series bus) drive may be inputted via an input port. 
     The controller  1210  may calculate an expected fabric cutting line by parsing an inputted raw fabric cutting program, and control the compressing portion  1220 , transfer portion  1230 , and cutting portion  1240  so that the cutting portion  1230  cuts fabrics along the calculated line. That is, the compressing portion  1220  may be controlled before cutting so that the fabrics are compressed by evacuating the area under the cover, and the transfer portion  1230  may be controlled so that the cutter of the cutting portion  1240  is transferred along the cutting line. Moreover, the cutting portion  1240  may be controlled to perform actual cutting, and the sealing portion  1240  may be controlled to seal the open area after the cutting operation of the cutting portion  1240 . 
     In this case, the sealing member cutting portion  1242  included in the sealing portion  1240  may be controlled in such a manner as to extract a curved section from the calculated, expected fabric cutting line and form notches on the sealing member in the curved section. That is, the expected fabric cutting line may include a linear section and/or a curved section. Since the sealing member becomes crumpled, cutting and sealing operations are difficult to perform in a curved section unless notches are formed. Therefore, the controller  1210  may control the sealing portion  1240  and the sealing member cutting portion  1242  in such a manner as to extract a curved section from the expected fabric cutting line and form appropriate notches according to the characteristics of the extracted curved section. 
     According to another exemplary embodiment of the present invention, the controller  1210  may be implemented as a separate external device, separately from the raw fabric cutting device. 
       FIG. 13  is a detailed flowchart showing in detail a process in which a raw fabric cutting device forms notches along a curved line according to a raw fabric cutting program, according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 13 , a raw fabric cutting program is inputted into the controller of the raw fabric cutting device (S 1310 ). As mentioned before, a raw fabric cutting program may be inputted directly from the user, inputted via a storage medium such as a USB drive, or received from other devices via communication means. 
     The controller calculates an expected cutting line by parsing the inputted program (S 1320 ). Then, a curved section is extracted from the expected cutting line (S 1330 ). In this instance, it is assumed that the curved section has a curvature equal to or greater than a given value. That is, if the curvature is less than a threshold, this means that providing the sealing member in a linear section will be enough, which therefore makes it unnecessary to form notches on the sealing member. Accordingly, for efficient sealing operation, a section having a curvature equal to or greater than a preset threshold may be deemed as a curved section. 
     The controller calculates the curvature of the extracted curved section (S 1340 ). If the curvature varies, that section is divided into different curved subsections, and the curvature of each curved subsection is calculated. Then, the spacing between notches and/or the shape of notches is determined according to the calculated curvature (S 1350 ). The spacing between notches and/or the shape of notches may be determined by a preset algorithm. That is, the controller may retrieve a notch formation algorithm according to the user settings stored in memory (not shown) and determine the spacing between notches and/or the shape of notches according to the correspondence relationship defined by the algorithm. Alternatively, the notch formation algorithm may be included in a raw fabric cutting program to determine a number of parameters for notch formation by parsing the program. 
     Next, notches are formed on opposite edges of the sealing member according to the determined the spacing between notches and/or the shape of notches (S 1360 ). 
       FIG. 14  is a conceptual diagram for explaining how a curved section is extracted from an analyzed, preliminary cutting line and the spacing between notches and the shape of notches are determined according to the curvature of the extracted curved section. 
     Referring to  FIG. 14 , the controller extracts a curved section  1400  from a calculated, expected fabric cutting line (which may include a linear section  1402 , a curved section  1400 , and a linear section  1406 ). 
     In the extracted curved section, the controller determines the starting point  1412  and ending point  1414  of the curved section. That is, to clearly define the curved section, the points where it starts and ends are set as the starting point  1412  and the ending point  1414 , respectively. Then, the controller calculates the curvature of a cutting line that runs from the starting point  1412  to the ending point  1414 . In this instance, if curves having different curvatures are connected together, they may be seen as different curved sections when calculating their curvature. The connected curved sections may be identified as different, and the starting point  1412  and ending point  1414  of each individual curved section may be set. The curvature is calculated as the rate of change of the tangent to the curve with respect to the arc-length, and is proportional to the degree of bending. 
     Once the curvature is calculated, the controller may determine the spacing  1420  between notches or the shape  1422  of notches, corresponding to the calculated curvature. According to the exemplary embodiment of the present invention, the larger the curvature, the more desirable it is to provide narrow spacing  1420  between notches. This is because, with a large curvature, it is highly likely that the sealing member gets crumpled when sealing is performed on the curve. Thus, it is desirable to make a plurality of notches in a curved section in order to prevent a crumpling or break. For example, if the curvature is 18.0, the spacing between notches may be set to 1 cm, and if the curvature is 10.0, the spacing  1420  between notches may be set to 2 cm. The spacing  1420  between notches corresponding to the curvature may be mathematically calculated by a specific inversely proportional formula. Alternatively, the spacing  1420  between notches may be determined within a set range by using a mapping table. For example, a mapping table may be set in such a manner that a curvature from 10 to 11 corresponds to 2 cm and a curvature from 11 to 12 corresponds to 1.8 cm. Once the curvature is calculated, the device may retrieve the corresponding spacing value from the mapping table and form notches with this spacing. 
     Furthermore, according to another exemplary embodiment of the present invention, a notch shape corresponding to a specific curvature may be set. For example, notch shapes appropriate for each curvature range may be stored in table form in such a manner that linear notches correspond to a curvature from 15 to 17 and triangular notches correspond to a curvature from 17 to 19. 
     Moreover, notches having the same shape may vary in central angle (in the case of triangular notches) or in radius (in the case of semicircular notches) according to the curvature. For example, with a small curvature, triangular notches may have a narrow central angle  1430  (see (a) of  FIG. 14 ), and with a large curvature, triangular notches may have a wide central angle  1432  (see (b) of  FIG. 14 ). 
       FIG. 15  is a cross-sectional view of a raw fabric cutting device where a sealing member with notches is loaded according to still another exemplary embodiment of the present invention. 
     Referring to  FIG. 15 , the raw fabric cutting device according to another exemplary embodiment of the present invention may have a sealing member  50  with notches loaded inside the main body  151 . That is, a sealing member cutting portion for forming notches is not required, and a sealing member  50  with notches formed on it may be loaded and fed to the open area by the guide roller  153  and the pressure roller  154 . 
     In this exemplary embodiment, notches may have various shapes, for example, linear, triangular, rectangular, pentagonal, semicircular, etc. Also, the spacing between notches may be set to vary. Besides, the central angle of notches (triangular notches), the radius of notches (semicircular notches), the length of notches (linear notches), the arrangement of notches (whether they are placed in a face-to-face arrangement or in a staggered arrangement on opposite edges of the sealing member), the number of notches formed, and so forth may be properly determined, thereby enabling the formation of notches in various shapes. 
     According to an exemplary embodiment of the present invention, the sealing member  50  may have a width corresponding to the size of notches. For example, the size of notches may refer to the area of notches if the notches are polygonal and semicircular, or may refer to the length of notches if the notches are linear. That is, the sealing member  50  with notches that are large in size are likely to break when sealing is performed in a curved section, and therefore it is desirable to use a proper length sealing member  50  fitted to the size of notches. 
     Although the present invention has been described with reference to the drawings and embodiments, the scope of the invention is not intended to be limited to the drawings and embodiments, and a person having ordinary skill in the art will understand that the present invention may be modified and changed in various ways without departing from the spirit and scope of the present invention which are written in the claims.