Abstract:
A face mask manufacturing machine includes a platform, a first-side edge fusion module, a second-side edge fusion module, a folding device, and a center line fusion module. The first-side and second-side edge fusion modules and the center line fusion module each comprise a pneumatic cylinder, which is operatively coupled to automatic control facility for carrying out automatic operation to thereby reduce the labor needed for operating fusion facility and enhance manufacturing efficiency.

Description:
BACKGROUND OF THE INVENTION 
     (a) Technical Field of the Invention 
     The present invention relates to a face mask manufacturing machine, and in particular to a face mask manufacturing machine that fully automatic to thereby reduce the operation labors and avoid negative influence on the feeding and fusion efficiency caused by inconsistency of human operation. 
     (b) Description of the Prior Art 
     A face mask is often used to isolate and shielding against dusts, contaminations and bacteria or viruses. The face mask is almost a must at the time when a disease is transmitted through air. 
     The face mask is also used by for example a motorcycle riders, a cooker, or a chemical facility operator and is used in potentially toxicant environments, such as oil refinery facility and chemical plants. The face mask helps to prevent the operators from taking in excessive amount of toxicant substance or materials. However, the mask itself is subject to contamination and/or deterioration of performance thereof after it has been used for a long time. Thus, a new mask must be used to replace the old, contaminated or performance-reduced mask. As a result of the frequent replacement of the face masks, the manufactures of face mask must be fully capable to supply a large quantity of face mask in certain situations in order to satisfy the need of the market. 
     Currently, the face mask is formed by an initial process of first folding a piece of multilayer cloth, followed by fusion. A subsequent intermediate process including sewing and cutting is then carried out to form a semi-finished product of face mask. Thereafter, accessories, such as a nose clip, are then added to the semi-finished product in a further subsequent process to complete the making of the face mask. In these processes, a number of steps are assisted by human labors. For example, the raw material is fed manually and the fusion operation is also carried out manually. Under this condition, the individual performance of the operators that carry out the above discussed operations may has significant influence on the manufacturing speed and precision of the semi-finished products of the face mask an also have influence on the quality and throughput of face masks. 
     Thus, the present invention is aimed to overcome the above discussed problems by providing a face mask manufacturing machine that can operate in an automatic manner. 
     SUMMARY OF THE INVENTION 
     The primary purpose of the present invention is to in view of the above, the present invention provides a free mask manufacturing machine that overcomes the drawback of the prior art that a lot of human labor is needed in the manufacturing of face masks. 
     Thus, an objective of the present invention is to provide a face mask manufacturing machine comprising a mask fusion apparatus, the mask fusion apparatus comprising: 
     a platform; 
     a first-side edge colon module arranged on the platform, comprising a frame, at least one first pneumatic cylinder, a first fusion die, a first ultrasonic heating device, and a first die cushion, the frame being arranged on and extending from a top surface of the platform, the first pneumatic cylinder being mounted to the frame and having a vertically movable linear shaft, the first fusion module being mounted to a lower end of the linear shaft to press onto a multilayer cloth to form a first-side edge contour of the mask, the first ultrasonic heating device being mounted to the frame and coupled to the first fusion die in order to induce ultrasonic vibration on and thus heating the first fusion die to increase temperature of the first fusion die for heat-fusion of the first-side edge contour of the multilayer cloth, the first die cushion being arranged in the platform in a vertically moveable manner at a location below the first fusion die; 
     a second-side edge fusion module arranged on the platform and adjacent to the first-side edge fusion module in a forward direction, comprising a frame, at least one second pneumatic cylinder, a second fusion die, a second ultrasonic heating device, and a second die cushion, the frame being arranged on and extending from the top surface of the platform, the second pneumatic cylinder being mounted to the frame and having a vertically movable linear shaft, the second fusion module being mounted to a lower end of the linear shaft to press onto the multilayer cloth to form a second-side edge contour of the mask, the second ultrasonic heating device being mounted to the frame and coupled to the second fusion die in order to induce ultrasound vibration on and thus heating the second fusion die to increase temperature of the second fusion die for heat-fusion of the second-side edge contour of the multilayer cloth, the second die cushion being arranged in the platform in a vertically movable manner at a location below the second fusion die; 
     a folding device arranged on the platform and adjacent to the second-side edge fusion module in the forward direction, comprising a guide board assembly and a guide roller set, the guide board assembly being arranged on the platform and comprising a guide board, which has a forward end portion forming a conic shape and an expanded rearward end portion opposing the second-side edge lesion module for guiding the multilayer cloth toward the forward end portion thereof for folding the multilayer cloth, the guide roller set being arranged on the top surface of the platform and adjacent to the forward end portion of the guide board, the guide roller set comprising two guide rollers that are horizontally adjacent to each other for driving the folded multilayer cloth through therebetween; and 
     a center line fusion module arranged on the top surface of the platform and adjacent to the folding device, the center line fusion module comprising a frame, at least one third pneumatic cylinder, a third fusion die, a third ultrasonic heating device, and a third die cushion, the frame being arranged on and extending from the top surface of the platform, the third pneumatic cylinder being mounted to the frame and having a vertically movable linear shaft, the third fusion module being mounted to a lower end of the linear shaft to press onto the multilayer cloth to form a center line contour of the mask, the third ultrasonic heating device being mounted on the frame and coupled to the third fusion die in order to induce ultrasonic vibration on and thus heating the third fusion die to increase temperature of the third fusion die for heat-fusion of the center line contour of the multilayer cloth, the third die cushion being arranged in the platform in a vertically movable manner at a location below the third fusion die. 
     The platform is provided with a feed roller set arranged at a rearward side of the first-side edge fusion module, the feed roller set being arranged on the top surface of the platform and comprising two brackets and two feed rollers, the brackets being mounted on the top surface of the platform, the feed rollers being rotatably mounted between the brackets and vertically adjacent to each other for driving the multilayer cloth through between the feed rollers for conveying foe multilayer cloth in the forward direction toward the first-side edgy fusion module. 
     The platform is further provided with a conveyance roller set arranged between the second-side edge fusion module and the folding device, the conveyance roller set comprising two brackets and two conveyance rollers, the brackets being mounted on the top surface of the platform, the conveyance rollers being rotatably mounted between the brackets and vertically adjacent to each other for driving the multilayer cloth through between the conveyance rollers and conveying the multilayer cloth toward the folding device. 
     The guide board assembly of the folding device comprises two support brackets and a support roller, the support brackets being mounted on the top surface of the platform and adjacent to the conveyance roller set in the forward direction, the support roller being rotatably mounted between the support brackets to support the multilayer cloth, the guide beard being mounted to the brackets. 
     The guide roller set comprises two brackets mounted to the top surface of the platform, the guide rollers being rotatably mounted between the brackets. 
     The platform is further provided with a conveyance roller set arranged between the folding device and the center line fusion module, the conveyance roller set comprising two brackets and two conveyance rollers, the brackets being mounted on the top surface of platform, the conveyance rollers being rotatably mounted between the brackets and vertically adjacent to each other for driving the multilayer cloth through between the conveyance rollers and conveying the multilayer cloth toward the center line lesion module. 
     In the above arrangement, the first, second, and third pneumatic cylinders can be connected to automatic control facility, such as an industrial computer, to automatically carry out fusion operation on the multilayer cloth with the fusion dies. This eliminates the need of human labor for operating fusion facility thereby reducing the inconsistency of quality caused by human error and enhancing throughput of face masks. Consequently, the quality of face mask, can be enhanced and the costs reduced. 
     The face mask manufacturing machine may further comprises a mask cutting apparatus, which is arranged next to the mask lesion apparatus at a location adjacent to the center line fusion module, the mask curling apparatus comprising: 
     a table having a top surface on which two rails are mounted, two caterpillar track sets being further provided on the top surface of the table and corresponding to the rails respectively, each caterpillar track set comprising a plurality of rollers rotatably mounted to the table and a caterpillar band surrounding the rollers; 
     two carrier sets respectively coupled to the caterpillar track sets for circulatory movement along the caterpillar track, each carrier set comprising a plurality of carriers arranged along the corresponding caterpillar band, each carrier comprising a chassis and a plurality of clamps pivotally mounted to the chassis for selectively clamping a mask material; 
     two closing mechanisms arranged on opposite edge portions of a rearward end portion of the table and corresponding to the caterpillar track sets respectively, each closing mechanism comprising a frame, a first pneumatic cylinder, and a push board, the name being mounted to the table, the first pneumatic cylinder being mounted to a top end of the frame and having a vertically movable linear shall, the push board being mounted to an end of the linear shaft and being operable to engage and thus upward push, the clamps of the carrier that is moved along the caterpillar track to a location corresponding to the closing mechanism, so as to rotate the clamps with respect to the chassis thereby dosing the clamps to allow the clamps and the chassis of the carrier to grip the mask material therebetween; 
     a cutting mechanism arranged on the table and located above the rails and the carrier sets, the cutting mechanism comprising a support frame, a cutter die cushion, an upper hydraulic cylinder, and a cutter die, the cutter die cushion being arranged in the top surface of the table in a vertically movable manner the upper hydraulic cylinder being mounted to the support frame and adjacent to the cutter die and having a vertically movable linear shaft, the cutter die being arranged at a location corresponding to a space between the two rails and in alignment with the cutter die cushion and the mask material, the cutter die being mounted to a lower end of the linear shaft of the upper hydraulic cylinder and being vertically movable therewith to cooperate with upward movement of the cutter die cushion to clamp the mask material for cutting; 
     two opening mechanisms arranged on opposite edge portions of a forward end portion of the table and corresponding to the caterpillar track sets respectively and adjacent to the cutting mechanism, each opening mechanism composing a frame, a third pneumatic cylinder, and a depressing board, the frame being mounted to the table, the third pneumatic cylinder being mounted to a top end of the frame and having a vertically movable linear shaft the depressing board being mounted to an end of the linear shall and being operable to downward depress the clamps of the carrier that is moved along the caterpillar track to a location corresponding to the opening mechanism so as to rotate the clamps with respect to the chassis to thereby open the clamps; and 
     a waste clearing device arranged on the table at the forward end portion thereof and adjacent to the opening mechanisms, the waste clearing device comprising a crossbar, a drive roller, a pneumatic cylinder, and a drive rod, the crossbar being mourned between the frames of the opening mechanisms, the drive roller being rotatably mounted to the crossbar to allow a length of waste of the mask material to wrap therearound, the pneumatic cylinder being mounted to the crossbar and adjacent to the drive roller, the drive rod being coupled to the pneumatic cylinder in vertically movable manner to selectively depress against the waste so as to pull and drag the waste. 
     The foregoing object and summary provide only a brief introduction to the present, invention. To fully appreciate these and other objects of the present invention as well as the invention, itself all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. 
     Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a perspective view showing a mask lesion apparatus of a face mask manufacturing machine constructed in accordance with the present invention; 
         FIG. 1B  is a perspective view showing the operation of the mask, fusion apparatus of the present invention in making face masks; 
         FIG. 2  is a perspective views showing a first-side edge fusion module and a second-side edge fusion module of the mask fusion apparatus of the present invention; 
         FIG. 3  is an exploded view of the first-side edge fusion module and the second-side edge fusion modulo of the mask fusion apparatus of the present invention; 
         FIG. 4  is a perspective view of a folding device of the mask fusion apparatus of the present invention; 
         FIG. 5  is a perspective view of a center line fusion module of the mask fusion apparatus of the present invention; 
         FIG. 6  is perspective view of first semi-finished face mask with the face mask manufacturing machine of the present inversion; 
         FIG. 7  is a perspective view illustrating a mask cutting apparatus of the face mask manufacturing machine in accordance with the present invention; 
         FIGS. 8A and 8B  are perspective views of a carrier of the mask cutting apparatus of the present invention; 
         FIGS. 9A and 9B  are perspective views illustrating clamping of mask material with the carriers; 
         FIGS. 10A and 10B  are perspective views of a cutting mechanism of the mask cutting apparatus of the present invention, illustrating the operation of the cutting mechanism; 
         FIGS. 11A and 11B  are perspective views illustrating the operation of releasing the mask material with opening mechanisms of the mask cutting apparatus of the present invention; 
         FIG. 12  is an enlarged perspective view illustrating the operation of a waste clearing device of the mask cutting apparatus of the present invention; and 
         FIG. 13  is a perspective view illustrating the operation of the mask cutting apparatus of the present invention in making face masks. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various chances to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims. 
     With reference to the drawings, a face mask manufacturing machine constructed in accordance with the present invention generally comprises a mask fusion apparatus, which is particularly shown in  FIGS. 1A and 1B , and a mask cutting apparatus, which is particularly shown in  FIGS. 7 and 13 . The fusion apparatus and the mask cubing apparatus will be separately described hereinafter, with reference to  FIGS. 1-13 . 
     With reference to  FIGS. 1A and 1B , the mask fusion apparatus comprises: a platform  100 , a feed roller set  10 , a first-side edge fusion module  20 , a second-side edge fusion module  30 , a first conveyance roller set  40 , a folding device  50 , a second conveyance roller set  60 , and a center line fusion module  70 . 
     Also referring to  FIGS. 2 and 3 , the first-side edge fusion module  20  is arranged on the platform  100  and comprises a frame, at least one first pneumatic cylinder  22 , a host fusion die  25 , a first ultrasonic heating device  23 , and a first die cushion  27 . The frame is arranged on and extends from a top surface of the platform  100  and comprises a top board  21 . The first pneumatic cylinder  22  is mounted to the top board  21  of the frame and has a vertically movable linear shaft. The first fusion module  25  is mounted to a lower end of the linear shaft to press onto a multilayer cloth  80  to form a first-side edge contour A of the mask, as shown in  FIG. 6 . The first ultrasonic heating device  23  is mounted to the top board  21  of the frame and is coupled to the first fusion die  25  in order to induce ultrasonic vibration on and thus heating the first fusion die  25  to increase temperature of the first fusion die  25  for heat-fusion of the first-side edge contour A of the multilayer cloth  80 . With this arrangement and operation, the layers of foe multilayer cloth  80  at corresponding locations are fused together. The first die cushion  27  is arranged in the platform  100  in a vertically movable manner at a location below the first fusion die  25  in order to support the first fusion die  25 . The second-side edge fusion module  30  is arranged on the platform  100  and is adjacent to the first-side edge fusion module  20  in a forward direction. The second-side edge fusion module  30  comprises a frame, at least one second pneumatic cylinder  32 , a second fusion die  35 , a second ultrasonic heating device  33 , and a second die cushion  37 . The frame is arranged on and extends from the top surface of the platform  100  and comprises a top board  31 . The second pneumatic cylinder  32  is mounted to the top board  31  of the frame and has a vertically movable linear shall. The second fusion module  35  is mounted to a lower end of the linear shaft to press onto the multilayer cloth  80  to form a second-side edge contour B of the mask, as shown in  FIG. 6 . The second ultrasound heating device  33  is mounted to the top board  31  of the frame is coupled to the second fusion die  35  in order to induce ultrasonic vibration on and thus heating the second fusion die  35  to increase temperature of the second fusion die  35  for heat-fusion of die second-side edge contour B of the multilayer cloth  80 . The set one die cushion  37  is arranged in the platform  100  in a vertically moveable manner at a location below the second fusion die  35  in order to support the second fusion die  35 . 
     The folding device  50  is arranged on the platform  100  and is adjacent to the second-side edge fusion module  30  in the forward direction. The folding device  50  comprises a guide board assembly  51  and a guide roller set  52 . 
     The guide board assembly  51  is arranged on the platform  100  and comprises a guide board  513 , which has a forward end portion forming a conic shape and an expanded rearward end portion opposing the second-side edge fusion module  30  for guiding the multilayer cloth  80  toward the forward end portion of the guide board  513  for folding the multilayer cloth  80 . 
     Also referring to  FIG. 4 , the guide roller set  52  is arranged on the top surface of die platform  100  and is adjacent to the forward end portion of the guide board  513 . The guide roller set  52  composes two guide rollers  515  that are horizontally adjacent to each other for driving the folded multilayer cloth  80  between the guide rollers  515 . 
     Also referring to  FIG. 5 , the center line fusion module  70  is arranged on the top surface of the platform  100  and is adjacent to the guide roller set  52  of the folding device  50 . The center line fusion module  70  comprises a frame, at least one third pneumatic cylinder  72 , a third fusion, die  75 , a third ultrasonic heating device  73 , and a third die cushion  77 . The frame is arranged on and extends from the top surface of the platform  100  and comprises a top board  71 . The third pneumatic cylinder  72  is mounted to the top board  71  of the frame and has a vertically movable linear shaft. The third fusion module  75  is mounted to a lower end of the linear shaft to press onto the multilayer cloth  80  to form a center line contour C of the mask, as shown in  FIG. 6 . The third ultrasonic heating device  73  is mounted on the top board  71  of the frame and is coupled to the third fusion die  75  in order to induce ultrasonic vibration on and thus heating the third fusion die  75  to increase temperature of the third fusion die  75  for heat-fusion of the center hue contour C of the multilayer cloth  80 . The third die cushion  77  is succeed in the platform  100  in a vertically movable manner at a location below the third fusion die  75  in order to support the third fusion die  75  and the multilayer cloth  80 . 
     When the first-side edge contour A, the second-side edge contour B, and the center line contour C of the multilayer cloth  80  are formed, a first semi-finished product  85  of face mask having a complete edge contour is completed. Subsequent, the cloth  80  is subject to cutting along the complete edge contour that has just formed to separate the first semi-finished product from the cloth  80  thereby forming an individual object, as shown in  FIG. 6 . 
     Preferably, the platform  100  is provided with a feed roller set  10 , which is arranged at a rearward side of the first-side edge fusion module  20 . The feed roller set  10  is arranged on the top surface of the platform  100  and comprises two brackets  15  and two feed rollers  11 . The brackets  15  are mounted on the top surface of the platform  100 . The feed rollers  11  are rotatably mounted between the brackets  15  and are vertically adjacent to each other for driving the multilayer cloth  80  through between the feed rollers  11  for conveying the multilayer cloth  80  in the forward direction toward the first-side edge fusion module  20 . 
     Preferably, the platform  100  is provided wife a first conveyance roller set  40  arranged between the second-side edge fusion module  30  and the folding device  50 . The first conveyance roller set  40  comprises two brackets  45  and two conveyance rollers  41 . The brackets  45  are mounted on the top surface of the platform  100 . The conveyance rollers  41  are rotatably mounted between the brackets  45  and are vertically adjacent to each other for driving the multilayer cloth  80  through between the conveyance rodeos  41  and conveying the multilayer cloth  80  toward the folding device  50 . 
     Preferably, the guide board assembly  51  of the folding device  50  further comprises two support brackets  511  and a support roller  512 . The support brackets  511  are mounted on the top surface of the platform  100  and are adjacent to the first conveyance roller set  40  in the forward direction. The support roller  512  is rotatably mounted between the support brackets  511  to support the multilayer cloth  80 . The guide board  513  is mounted to the brackets  511 . 
     Preferably, the grade roller set  52  further comprises two brackets  514  mounted to the top surface of the platform  100 . The guide rollers  515  are rotatably mounted between the brackets  514 . 
     Preferably, the platform  100  is further provided with a second conveyance roller set  60  arranged between the folding device  50  and the center line fusion module  70 . The second conveyance roller set  60  comprises two brackets  65  and two conveyance rollers  61 . The brackets  65  are mounted on the top surface of the platform  100 . The conveyance rollers  61  are rotatably mounted between the brackets  65  and are vertically adjacent to each other for driving the multilayer cloth  80  through between the conveyance rollers  61  and conveying the multilayer cloth  80  toward the center line fusion module  70 . 
     In the above arrangement, the first, second, and third pneumatic cylinders  22 ,  32 ,  72  and the first, second, and third ultrasonic heating device  23 ,  33 ,  73  can all be connected to automatic control facility, such as an industrial computer, to automatically drive the first, second and third fusion dies  25 ,  35 ,  75  to carry out fusion operation on the multilayer cloth. This eliminates the need of human labor for operating fusion facility thereby avoiding reduction of manufacturing quality and throughput of the first semi-finished product  85  caused by inconsistency resulted from manual operation. Consequently, the quality of the semi-finished product of the face mask can be enhanced and the costs reduced. 
     Referring to  FIGS. 7 and 13 , the mask cutting apparatus, broadly designated at  1000 , is arranged next to the mask fusion apparatus at a location adjacent to the center line fusion module  70  to process a length of a mask material  120  for cutting the mask material  120  to form a plurality of second semi-finished products  122  of face mask and also clear off waste material  124  generated due to the cutting and formation of the second semi-finished products  122 . The mask cutting apparatus  1000  comprises: a table, two carrier sets, two closing mechanisms  140 , a cutting mechanism  150 , two opening mechanisms  160 , and a waste clearing device  170 . 
     Also referring to  FIGS. 7 and 11A , the table has a top surface on which two rails  130  are mounted. Two caterpillar track sets are also provided on the top surface of the table and corresponding to the rails  130  respectively. Each caterpillar track set comprises a plurality of rollers rotatably mounted to the table and a caterpillar band surrounding the rollers. Further, the table is provided with at least one pair of drive rollers  132 , which are located between the rails  130  and are arranged in a vertically adjacent manner in order to clamp the mask material  120  for conveying the mask material  120  in a forward direction. 
     Referring to  FIGS. 8A ,  8 B,  9 A, and  9 B, the carrier sets are respectively coupled to the caterpillar track sets mounted on the table for circulatory movement along die caterpillar tracks. Each carrier set comprises a plurality of carriers  110  arranged along the corresponding caterpillar band. Each carrier  110  comprises a chassis  112  and a plurality of clamps  116  pivotally mounted to lire chassis  112 . The chassis  112  is coupled to the corresponding caterpillar band and is movable along the corresponding rail  130 . A plurality of rollers  1122  are rotatably mounted to an underside of the chassis  112 . The rollers  1122  are in rolling contact engagement with inner faces of the corresponding rails  130  to allow the chassis  112  to slide with respect to the rails  130 . Each clamp  116  has an inner end forming a clamping member and an outer end to which a roller based driven member  1164  is rotatably mounted. Each clamp  116  is provided with a resilient element at an outer side thereof and the resilient element is arranged to bias the inner end of the clamp  116  toward an engaging condition where the clamping member of the inner end of the clamp  116  engages the chassis  112  or a separating condition where the inner end of the clamp  116  is biased away from the chassis  112 , based on the angular position of the clamp  116  with respect to the chassis  112 . In this way the mask material  120  can be selectively pinched between the clamping member of the clamp  116  and the chassis  112 . 
     Referring to  FIG. 9A , the closing mechanisms  140  are arranged on opposite edge portions of a rearward end portion of the table and corresponding to the caterpillar track sets respectively. Each closing mechanism  140  comprises a frame, a first pneumatic cylinder, and a push board  142 . The frame is mounted to the table. The first pneumatic cylinder is mounted to a top end of the frame and has a vertically movable linear shaft. The push board  142  is mounted to an end of the linear shaft and is operable to engage and thus upward push the clamps  116  of the carrier  114  that is, at the rime of operation, moved along the caterpillar track to a location corresponding to the closing mechanism  140  so as to rotate the clamps  116  with respect to the chassis  112  thereby closing the clamps  116  to allow the clamps  116  and the chassis  112  of the carrier  110  to grip or pinch the mask material  120  therebetween. 
     Also referring to  FIGS. 10A and 10B , the cutting mechanism  150  is arranged on the table and located above the rails  130  and the carrier sets. The cutting mechanism  150  comprises a support frame, a cutter die cushion  156 , an upper hydraulic cylinder  152 , a cutter die  154 , and two skid-resistant bars  158 . The cutter die cushion  156  is arranged in the top surface of the table in a vertically movable manner. The upper hydraulic cylinder  152  is mounted to the support frame and is adjacent to the cutter die  154  and has a vertically movable linear shaft. The cutter die  154  is arranged at a location corresponding to a space between the two rails  130  and in alignment with the cutter die cushion  156  and the mask material  120 . The cutter die  156  is mounted to a lower end of the linear shaft of the upper hydraulic cylinder  152  and is vertically movable therewith to cooperate with upward movement of the cutter die cushion  156  to clamp the mask material  120  in outer to carry out the cutting operation of the mask material  120 . The skid-resistant bars  158  are mounted to a lower end of the support frame and are selectively put in abutting engagement with the mask material  120  located on the table for retaining the mask material  120  in position without undesired movement with respect to the table during the cutting operation. 
     Also referring to  FIGS. 11A and 11B , the opening mechanisms  160  are arranged on opposite edge portions of a forward end portion of the table and corresponding to the caterpillar track sets respectively and are adjacent to the cutting mechanism  150 . Each opening mechanism  160  comprises a frame, a third pneumatic cylinder, and a depressing board  162 . The frame is mounted to the table. The third pneumatic cylinder is mounted to a top end of the frame and has a vertically movable linear shaft. The depressing board  162  is mounted to an end of the linear shaft and is operable to downward depress the roller-based driven members  1164  of the clamps  116  of the carrier  110  that is moved along the caterpillar track to a location corresponding to the opening mechanism  160  so as to rotate the clamps  116  with respect to the chassis  112  to thereby open the clamps  116 . 
     Also referring to  FIG. 12 , the waste clearing device  170  is arranged on the table at the forward end portion thereof and is adjacent, to the opening mechanisms  160 . The waste clearing device  170  comprises a crossbar, a drive roller  174 , a pneumatic cylinder, and a drive rod  172 . The crossbar extends transversely across the table and is mounted between the frame of the opening mechanisms  160 . The drive roller  174  is rotatably mounted to the crossbar to allow the waste material of the mask material to wrap therearound. The pneumatic cylinder is mounted to the crossbar and is adjacent to the drive roller  174 . The drive rod  172  is coupled to the pneumatic cylinder in vertically movable manner to selectively depress against the waste material  124  so as to pull and drag the waste material  124 . 
     In the above arrangement, the first pneumatic cylinder, the upper hydraulic cylinder  152 , and the third pneumatic cylinder can be power-driven so as to control the operation of die push board  142 , the depressing board  162 , and the cutter die  154 . Further, the carrier sets can be connected to a driving motor for self-circulatory movement. Thus, the operation of the mask cutting apparatus in accordance with the present invention can be carried out completely without intervening of human labor thereby realizing full automation, of production of semi-finished products of face masks, leading to reduction of labor costs and increasing of manufacturing speed and passing rate. 
     Although the present invention bus been described with reference to the preferred embodiment thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims. 
     It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
     While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.