Abstract:
Disclosed are a paper storage and a printer. The paper storage comprises: a warehouse body ( 20 ) for accommodating a medium, a medium outlet (A), and a roller ( 5 ) arranged on the storage body ( 20 ), wherein the medium outlet (A) is configured to discharge the medium accommodated in the storage body ( 20 ) after the medium passes by the roller ( 5 ), and an opening ( 224 ) opposite to the roller ( 5 ) is also arranged on a wall of the storage body ( 20 ), to allow an external medium processing device to match with the roller ( 5 ) through the opening ( 224 ) to process the medium. To replace the paper storage in a printer adopting such paper storage, the need for respective detachment of various parts of the paper storage, and the need for opening of the upper cover of the printer to load the paper roll are eliminated, thereby avoiding the problems of complex operations of replacing the paper roll and inconvenience in use.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a national stage application of International Application No. PCT/CN2014/076165, filed Apr. 24, 2014 which claims priority to Chinese patent application No. 201310158829.X, entitled “Paper Storage, Printer and Method for Using Multiple Types of Mediums” and filed on May 2, 2013 with the State Intellectual Property Office of China, the disclosure of which is incorporated therein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a paper storage, a printer adopting the paper storage, and a method for using multiple types of mediums. 
     BACKGROUND 
     The existing printer includes a printing mechanism and a paper storage fixedly connected with a frame, where a paper roll for printing is placed in the paper storage, and printing paper (i.e. a printing medium) may lead out from the paper roll to be printed by the printing mechanism and outputted to the outside of the printer. Due to the fact that a user needs to use different types of paper rolls depending on a specific case in some scenarios, there is a need for easy replacement of the paper roll in the printer, to improve the work efficiency. 
     International application Publication No. WO2007111235 provides a printer with a detachable paper storage. As shown in  FIG. 1A , a printer  1 ′ includes a body  2 ′, an upper cover  3 ′ and a paper storage  4 ′ for accommodating printing paper, where the upper cover  3 ′ is pivoted with side walls  14   a  and  15   a  of the body  2 ′ and may be rotatably opened or closed relative to the body  2 ′. A printing head  21 ′ is arranged in the body  2 ′, and a roller  22 ′ is arranged on the upper cover  3 ′, so that when the upper cover  3 ′ is closed relative to the body  2 ′, the printing head  21 ′ tangentially matches with the roller  22 ′. 
     A first space portion  34 ′ is formed between the side walls  14   a  and  15   a  of the body  2 ′, and a second space portion  35 ′ is formed between side arms  32 ′ and  33 ′ of the upper cover  3 ′. The paper storage  4 ′ is mounted in a space formed by the first space portion  34 ′ and the second space portion  35 ′. The paper storage  4 ′ includes a first part  4   a  and a second part  4   b , where a first slot  45 ′ and a second slot  46 ′ of the second part  4   b  match with a first inserting pin  39 ′ and a second inserting pin (not shown) on the body in a plugging manner, and a first inserting tab  40 ′ and a second inserting tab  41 ′ of the second part  4   b  match with the side walls  14   a  and  15   a  of the body  2 ′ in a plugging manner; while clamping detents  51 ′ and  52 ′ of the first part  4   a  match with the two side arms of the upper cover  3 ′ in a clamping manner, so that when the upper cover  3 ′ is rotatably opened relative to the body  2 ′, the first part  4   a  is accordingly opened. After the paper storage  4 ′ is installed in the printer, as shown in  FIG. 1B , a leading end of the printing paper is pulled out from the paper roll and then the upper cover  3 ′ is closed, in this case, the printing paper is pressed between the roller  22 ′ and the printing hear  21 ′ and hence printing can be started. The printer can selectively adopt paper storages having different structural sizes to utilize paper rolls with different outer diameters. 
     However, the existing printer is defective in that: replacement by a paper roll with a different outer diameter requires for replacement by a paper storage having a different structural size, which requires for installing the first part and the second part of the paper storage respectively, and each time the paper roll is being installed, the upper cover is opened so as to pass the printing paper between the roller and the printing head, thus the operations of replacing the paper roll for such printer are complicated, causing inconvenience in use. 
     SUMMARY OF THE INVENTION 
     An object of the present disclosure is to provide a paper storage which is easy to replace and convenient in use. An object of the present disclosure is also to provide a printer adopting the paper storage. An object of the present disclosure is further to provide a method of using multiple types of mediums. 
     To this end, according to one aspect of the present disclosure, a paper storage is provided and includes: a storage body for accommodating a medium, a medium outlet, and a roller arranged on the storage body, where the medium outlet is configured to discharge the medium accommodated in the storage body after the medium passes by the roller, and an opening opposite to the roller is provided on a wall of the storage body, to allow an external medium processing device to match with the roller through the opening to process the medium. 
     Further, the paper storage includes a chassis and an upper cover, and the chassis and the upper cover are combined to form the medium outlet. 
     Further, the roller is arranged on the upper cover and the opening is arranged on the chassis. 
     Further, the paper storage also includes a paper tearing bar located at the medium outlet and arranged on the chassis. 
     Further, a guide member configured to limit a position of the medium in a width direction is arranged in the storage body. 
     Further, the paper storage also includes a clamping structure configured to lock the upper cover and the chassis together when the upper cover is closed relative to the chassis. 
     Further, the upper cover is pivoted with or detachably connected with the chassis. 
     Further, a gear in a transmission connection with a driving mechanism of the external medium processing device is arranged at an axial end of the roller. 
     Further, the paper storage also includes a connection structure configured to connect the storage body with the external medium processing device. 
     According to another aspect of the present disclosure, a printer is provided and includes: a base and a detachable paper storage as described above, where a printing head assembly is arranged on the base, and a roller of the paper storage is configured to match with a printing head of the printing head assembly at an opening of the paper storage. 
     Further, the base is provided with a driving mechanism configured to drive the roller to rotate. 
     Further, the base is provided with a concave portion configured to position the paper storage. 
     Further, a clamping structure configured to clamp the paper storage and the base together is arranged between the paper storage and the base. 
     Further, a locking mechanism configured to lock the paper storage is further arranged on the base, and the locking mechanism includes a lock hook configured to match with a core shaft of the roller on the paper storage in a locking manner. 
     Further, a first elastic element declining toward the paper storage is arranged in the concave portion so that the paper storage always trends to move away from the concave portion. 
     According to yet another aspect of the present disclosure, a printer is provided and includes: a base and a paper storage detachably connected with the base, where the paper storage includes a chassis and an upper cover which are pivoted with each other through a pivot shaft, where the upper cover is rotatable to be opened or closed relative to the chassis, a roller is arranged on the upper cover, and an opening is arranged on the chassis; a printing head assembly, a driving mechanism configured to drive the roller to rotate, and a concave portion configured to accommodate the paper storage are arranged on the base; a clamping slot configured to clamp the pivot shaft is arranged in the concave portion, and a lock hook configured to lock the core shaft of the roller is arranged on the chassis; and a space configured to accommodate a medium is formed between the upper cover and the chassis when the upper cover is closed relative to the chassis, and the roller matches with a printing head of the printing head assembly at the opening. 
     The present disclosure also provides a method of using multiple types of mediums including: providing a medium processing system comprising a medium processing device and a plurality of paper storages, and to utilize a different type of medium, combining the paper storage accommodating the type of medium with a base of the medium processing device, wherein the medium is outputted from a medium outlet of the paper storage after passing by a roller of the paper storage, and the medium processing device matches with the roller via an opening of the paper storage to process the medium. 
     Further, the medium processing system is a printing system, and the medium processing device is a printer. 
     When the paper storage of the present disclosure is installed on the base of the printer, before the medium in the paper storage is outputted from the medium outlet of the paper storage after passing by the paper storage, the medium is sandwiched between the printing head of the printer and the roller at the opening of the paper storage, is printed by the printing head and then extrudes from the paper storage via the medium outlet of the paper storage. The paper storage can be wholly removed from the printer to detach the paper storage. Therefore, compared with the prior art, the printer adopting the paper storage of the present disclosure eliminates, in replacing the paper storage, the need for respective detachment of various parts of the paper storage and the need for opening of an upper cover of the printer to load the paper roll, thus the problem of the complicated operations of replacing the paper roll and inconvenience in use is avoided. 
     In addition to the above objects, features and advantages, other objects, features and advantages of the present disclosure will be further described in detail in combination with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Accompanying drawings, which construct a part of the specification and are used for better understanding of the present disclosure, illustrate some preferred embodiments of the present disclosure, and show principles of the present disclosure in combination with the description below. 
         FIG. 1A  is a structural view of a printer adopting a detachable paper storage provided in International Application Publication No. WO2007111235; 
         FIG. 1B  is a structural section view of the printer shown in  FIG. 1A ; 
         FIG. 2  is a structural section view of a paper storage according to a first embodiment of the present disclosure; 
         FIG. 3A  is a first isometric view of the paper storage according to the first embodiment of the present disclosure, where the upper cover is opened; 
         FIG. 3B  is a second isometric view of the paper storage according to the first embodiment of the present disclosure, where the upper cover is opened; 
         FIG. 4  is an isometric structural view of the paper storage according to the first embodiment of the present disclosure, where the upper cover is closed; 
         FIG. 5  is an isometric structural view of the paper storage according to a second embodiment of the present disclosure, where the upper cover is closed; 
         FIG. 6  is a structural view of a printer according to a first embodiment of the present disclosure; 
         FIG. 7  is a structural section view of the printer according to the first embodiment of the present disclosure; 
         FIG. 8  is a structural view of the printer according to the first embodiment of the present disclosure, where the paper storage is separate from a base of the printer; 
         FIG. 9  is a first view of installing of the paper storage into the printer according to the first embodiment of the present disclosure; 
         FIG. 10  is a second view of installing of the paper storage into the printer according to the first embodiment of the present disclosure; 
         FIG. 11  is a partial structural section view of a printer according to a second embodiment of the present disclosure; 
         FIG. 12  is a first view of installing of a paper storage into a printer according to a third embodiment of the present disclosure; and 
         FIG. 13  is a second view of installing of a paper storage into a printer according to the third embodiment of the present disclosure. 
     
    
    
     
       
         
               
             
               
               
             
           
               
                   
               
               
                 List of reference numerals 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1. Base 
                 2. Paper storage 
               
               
                 4. Printing head assembly  
                 5. Roller 
               
               
                 7. Elastic hook 
                 8. Elastic slice 
               
               
                 11. Left wall 
                 12. Right wall 
               
               
                 13. Upper casing 
                 14. Bottom casing 
               
               
                 15. Bracket 
                 16. Notch 
               
               
                 17. Concave portion 
                 20. Storage body 
               
               
                 21. Upper cover 
                 22. Chassis 
               
               
                 23. Paper tearing bar 
                 24. Clamping hook 
               
               
                 25. Guide member 
                 31. Third connection member 
               
               
                 32. Fourth connection member 
                 33. Clamping part 
               
               
                 34. Clamping slot 
                 41. Printing head 
               
               
                 42. Second elastic element 
                 43. Support plate 
               
               
                 51. Core shaft 
                 52. Roller wheel 
               
               
                 53. Gear 
                 211. Pivot shaft 
               
               
                 221. Left side wall 
                 222. Right side wall 
               
               
                 223. Bottom board 
                 224. Opening 
               
               
                 225. Inserting slot 
                 312. Clamping member 
               
               
                 321. Rotation shaft 
                 322. Locking hook 
               
               
                 323. Third elastic element 
                 324. Button 
               
               
                   
               
             
          
         
       
     
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Embodiments of the present disclosure are described in detail below in combination with the accompanying drawings, although the present disclosure can be implemented in various ways defined and covered by the appended claims. 
       FIG. 2  is structural section view of a paper storage according to a first embodiment of the present disclosure,  FIG. 3A  is a first isometric view of the paper storage according to the first embodiment of the present disclosure where the upper cover is opened,  FIG. 3B  is a second isometric view of the paper storage according to the first embodiment of the present disclosure where the upper cover is opened, and  FIG. 4  is an isometric structural view of the paper storage according to the first embodiment of the present disclosure, where the upper cover is closed. As shown in  FIGS. 2, 3A, 3B and 4 , a paper storage  2  includes a storage body  20  and a roller  5  arranged on the storage body  20 , where the storage body  20  is provided with a medium outlet A and an opening  224  that is opposite to the roller  5 . 
     The storage body  20  includes an upper cover  21  and a chassis  22 , which are combined in such a way that the medium outlet A is formed. The chassis  22  includes a left side wall  221 , a right side wall  222  and a bottom board  223 , where the left side wall  221  and the right side wall  222  are arranged in parallel to each other, a distance between an inner surface of the left side wall  221  and an inner surface of the right side wall  222  matches with the maximum width of a paper roll, and the bottom board  223  is connected perpendicularly between the left side wall  221  and the right side wall  222 . Preferably, the bottom board  223  has a cross section of an arc shape having a radius matching with the maximum radius of the paper roll. The bottom board  223  is provided with the opening  224 , which has a longitudinal direction extending along a width direction of the paper roll and has a preset width. In other embodiments of the present disclosure, the bottom board  223  may have a cross section of a trapeziform or rectangular shape. 
     The upper cover  21  is pivoted with or connected detachably with the chassis  22 . In the present embodiment, the upper cover  21  is pivoted with the chassis  22  through a pivot shaft  211 , and may be rotatably opened or closed relative to the chassis  22 . The pivot shaft  211  is located at a side of the chassis  22  away from the opening  224 , and has an axis extending in a direction perpendicular to the left side wall  221  and the right side wall  222 . When the upper cover  21  is closed, a space accommodating the paper roll is formed by the upper cover  21  and the chassis  22 , and the paper roll rolls freely in the space. In this case, a side of the upper cover  21  away from the pivot shaft  211  is opposite to a side of the chassis  22  away from the pivot shaft  211  and is apart from side of the chassis  22  away from the pivot shaft  211  by a predefined distance to form the medium outlet A. 
     The roller  5  is arranged at a side of the upper cover  21  away from the pivot shaft  211  and has an axis parallel to the axis of the pivot shaft  211 . The roller  5  includes a core shaft  51 , a roller wheel  52 , and a gear  53 , where the core shaft  51  has an axis parallel to the axis of the pivot shaft  211 , and is supported on the upper cover  21  at its both ends, so that the core shaft  51  is rotatable about its own axis. The roller wheel  52  is fixedly arranged on the periphery of the core shaft  51  and extends along the axial direction of the core shaft  51 . The roller wheel  52  has a length larger than the width of the printing paper, and may be made of elastic material such as rubber or plastic. When the core shaft  51  is rotated, the roller wheel  52  is rotated synchronously with the core shaft  51 . When the upper cover  21  is closed, the roller wheel  52  is opposite to the opening  224  on the chassis  22 , in this case, the roller wheel  52  may be located within the chassis  22 , or may pass through the opening  224  on the chassis  22  to be exposed at the external of the paper storage  2 . The gear  53  is fixedly installed on one end of the core shaft  51 , and is transmission connected with a driving mechanism of the printer when the paper storage  2  is installed in the printer. When the gear  53  is driven to rotate by the driving mechanism of the printer, the gear  53  causes the core shaft  51  to rotate, and the roller wheel  52  rotates accordingly. 
     The paper storage  2  also includes a locking assembly, which is configured to fix the upper cover  21  at a locked position where the upper cover  21  is closed relative to the chassis  22 . In the present embodiment, the locking assembly is embodied as a clamping structure including a clamping hook  24  and a clamping slot (not shown), where the clamping hook  24  is located on one of the chassis  22  and the upper cover  21 , and the clamping slot is located on the other of the chassis  22  and the upper cover  21 . When the upper cover  21  is closed, the clamping hook  24  matches with the clamping slot in a clamping manner, so that the upper cover  21  is fixed at the locked position for closing. When a user pushes the clamping hook  24 , the clamping hook  24  is separated from the clamping slot so that the upper cover  21  is opened. In the present embodiment, the paper storage  2  includes two locking assemblies, which are symmetrically arranged with respect to a middle line between the left side wall  221  and the right side wall  222  of the chassis  22  in the width direction, where two clamping hooks  24  are located at inner sides of the left side wall  221  and the right side wall  222  of the chassis  22 , respectively, and two clamping slots are located on two side walls of the upper cover  21 . Thus, when the upper cover  21  is closed, the two clamping hooks  24  match with the two clamping slots in a clamping manner, so that the upper cover  21  is fixed at the locked position for closing; and to open the upper cover  21 , the clamping hooks  24  are pushed from both sides and hence are separated from the clamping slots, thereby opening the upper cover  21 . 
     It is noted that in other embodiments of the present disclosure, the locking assembly may include a lock hook and a lock shaft, where the lock hook is pivoted with one of the upper cover  21  and the chassis  22  through a rotation shaft and is rotatable about an axis of the rotation shaft, while the lock shaft is arranged on the other of the upper cover  21  and the chassis  22 , thus, when the upper cover  21  is closed relative to the chassis  22 , the lock hook matches with the lock shaft in a clamping manner to fix the upper cover  21  at the locked position for closing, and when the lock hook is separated from the lock shaft, the upper cover  21  is allowed to be opened relative to the chassis  22 . 
     The paper storage  2  further includes a connection structure configured to connect the paper storage  2  with the printer. In the present embodiment, the connection structure is a first connection mechanism including a first connection member and a second connection member. Preferably, the first connection member is located at an end of the chassis  22  away from the opening  224 , and the second connection member is located at an end of the chassis  22  close to the opening  224 . Here, the first connection member may be a clamping part or a clamping slot arranged at the outer side of the bottom board  223  of the chassis  22  of the paper storage  2  or at the outer sides of the left side wall  221  and the right side wall  222  of the chassis  22 . When the first connection member is the clamping part, the clamping slot is correspondingly arranged on the printer, and when the first connection member is the clamping slot, the clamping part is correspondingly arranged on the printer, so that the clamping slot matches with the clamping part in a clamping manner. The second connection part may be the lock shaft or the lock hook arranged on the outer sides of the left side wall  221  and the right side wall  222  of the chassis  22 , thus, when the second connection part is the lock shaft, the lock hook is correspondingly arranged on the printer, and when the second connection part is the lock hook, the lock shaft is correspondingly arranged on the printer, so that the lock hook matches with the lock shaft in a locking manner. Therefore, the paper storage  2  is fixedly connected with the printer through the first connection member and the second connection member. 
     In the present embodiment, the first connection member is a pivot shaft  211  and the second connection member is the core shaft  51  of the roller  5 . When the paper storage is installed in the printer, the core shaft  51  of the roller  5  matches with the lock hook arranged on the printer in a locking manner, to facilitate limiting the relative position of the roller  5  and the printing head of the printer. In other embodiments of the present disclosure, the lock shaft is alternatively arranged on the side wall of the chassis  22 , so that the lock shaft matches with the lock hook arranged on the printer in a locking manner. Therefore, the upper cover  21  of the paper storage  2  may be directly opened to replace the paper roll when the paper storage is installed in the printer, thereby simplifying the operation steps of replacing the paper roll. 
     Preferably, the paper storage  2  also includes a paper tearing bar  23  of a slice shape located at the medium outlet A, and the paper tearing bar  23  may be fixedly installed on the chassis  22  or the upper cover  21 . By pulling the printing paper forcibly, the printing paper will be torn by the blade of the paper tearing bar  23 . In the present embodiment, the paper tearing bar  23  is fixedly installed on the chassis  22 . 
     In installing the paper roll, the upper cover  21  is firstly opened, then the paper roll is placed in the chassis  22 , a leading end of the printing paper is drawn out from the paper storage, and finally the upper cover  21  is closed so that the clamping hook  24  on the chassis  22  matches with the clamping slot on the upper cover  21  in a clamping manner, thereby accomplishing the installing of the paper roll. In this case, the printing paper passes by the roller wheel  52  of the roller  5  and is exposed at the opening  224  of the chassis  22 , and the leading end of the printing paper is led out from the medium outlet A of the paper storage  2 . 
     In the paper storage provided in the present embodiment, the upper cover is pivoted with the chassis and the roller is arranged on the upper cover, so that after the paper roll is installed in the paper storage, the printing paper is discharged from the medium outlet after passing by the roller, and meanwhile the printing paper is exposed at the opening of the chassis. When the paper storage is installed on the printer, the roller on the paper storage matches with the printing head of the printer at the opening of the paper storage, and the printing paper is sandwiched between the roller and the printing head so that printing can be performed on the printing paper by the printing head. To detach the paper storage, the paper storage can be as a whole removed from the printer. Therefore, compared with the prior art, the printer adopting the paper storage of the present disclosure eliminates, in replacing the paper storage, the need for respective detachment of various parts of the paper storage and the need for opening of an upper cover of the printer to load the paper roll, thus the problem of the complicated operations of replacing the paper roll and inconvenience in use is avoided. 
     It is noted that, in the above embodiment, the upper cover of the storage body is turned over to be opened or closed relative to the chassis in a front-and-rear direction. When the upper cover is closed, the storage body for accommodating the medium is formed by the upper cover and the chassis, and the medium outlet is opposite to the pivoting position. In other embodiments, the upper cover may be laterally turned over to be opened relative to the chassis in a left-and-right direction, and in this case, the medium outlet is located at the side of the pivot shaft on the upper cover. Alternatively, the storage body may be formed in another way or by other parts, without being limited to the upper cover and the chassis as well as the pivot connection between the upper cover and the chassis. 
     It is noted that, in the above embodiment, the roller is exposed at the opening of the paper storage and is tangential to the printing head. In other embodiments, the printing head may enter into the paper storage through the opening of the paper storage to tangentially match with the roller. 
     It is noted that, in the above embodiment, the chassis  22  and the upper cover  21  are combined to form the medium outlet A. In other embodiments, an opening may be provided on the surface of the upper cover  21  to form the medium outlet. 
       FIG. 5  is an isometric structural view of the paper storage according to a second embodiment of the present disclosure, where the upper cover is closed. As shown in  FIG. 5 , the second embodiment is different from the previous embodiment in that: the paper storage  2  further includes at least one guide member  25  in the present embodiment, and accordingly at least one inserting slot  225  for installing the guide member  25  is arranged on the bottom board  223  of the chassis  22 . 
     Here, the guide member  25  is configured to adjust the width of the paper storage  2 , limit the movement of the paper roll placed in the paper storage  2  in an axial direction of the paper roll, and hence prevent the deflected movement of the printing paper. The number of the guide members  25  depends on the alignment manner of the printing paper. When the printing paper is aligned by using one side of the paper storage as a reference plane, one guide member  25  is included in the paper storage  2 , and accordingly several inserting slots  225  are provided on the bottom board  223  of the chassis  22  in the width direction of the paper roll, so that when the guide member  25  is inserted into one of the several inserting slots  225 , a distance between the guide member  25  and the reference plane matches with the width of a certain type of paper roll, thus, the guide member  25  is inserted into the corresponding inserting slot  225  depending on the width of the paper roll in use. When the printing paper is aligned with reference to a center line of the paper storage  2  in the width direction, two guide members  25  are included in the paper storage  2 , and accordingly several inserting slots  225  are provided on the bottom board  223  of the chassis in the width direction of the paper roll, where the inserting slots  225  are divided into groups, each of which includes two inserting slots  225  arranged symmetrically with respect to the center line of the paper storage  2  in the width direction, and a distance between the inserting slots  225  of each group matches with the width of a certain type of paper roll, thus, the two guide members  25  are respectively inserted into the corresponding inserting slots  225  depending on the width of the paper roll in use. 
     In the present embodiment, the printing paper is aligned with reference to the center line of the paper storage  2  in the width direction, and hence there are two guide members  25 , which match with the corresponding inserting slots  225  on the bottom board  223  in a plugging manner and are both parallel to the left side wall  221  and the right side wall  222 , so that the two guide members  25 , together with the bottom board  223  of the chassis  22 , form a paper accommodating space, and the movement of the paper roll in the paper accommodating space along the axial direction of the paper roll is eliminated. Therefore, the paper storage provided in the present embodiment is applicable to paper rolls of different widths, and hence has improved adaptability to mediums. 
       FIG. 6  is a structural view of a printer according to the first embodiment of the present disclosure,  FIG. 7  is a structural section view of a printer according to the first embodiment of the present disclosure, and  FIG. 8  is a view of the printer according to the first embodiment of the present disclosure, where the paper storage is separate from a base of the printer. As shown in  FIG. 6 ,  FIG. 7  and  FIG. 8 , a printer includes a base  1 , a paper storage  2 , a printing head assembly  4 , and a second connection mechanism. The printing head assembly  4  and the second connection mechanism are both arranged on the base  1 , and the paper storage  2  is one of those paper storages described in the above embodiments and is detachably connected with the base  1 . After the paper storage  2  is connected with the base  1 , the roller  5  on the paper storage  2  tangentially matches with the printing head  41  of the printing head assembly  4  at the opening of the paper storage. 
     As shown in  FIG. 8 , the base  1  includes a left wall  11 , a right wall  12 , and a bottom casing  14 . The left wall  11  and the right wall  12  are parallel to each other and are spaced by a predefined distance, and a distance between an inner surface of the left wall  11  and an inner surface of the right wall  12  matches with the width of the paper storage  2 . The bottom casing  14  is connected between the left wall  11  and the right wall  12 , and has a cross section of a shape matching with the shape of the cross section of the chassis  22  of the paper storage  2 . The left wall  11 , the right wall  12  and the bottom casing  14  form a concave portion  17  configured to position and accommodate the paper storage  2 . 
     Preferably, the base  1  further includes an upper casing  13  located between the left wall  11  and the right wall  12  and above the bottom casing  14 , and the upper casing  13  is opposite to a portion of the bottom casing  14 . The concave portion  17  is located at a side of the bottom casing  14  not opposite to the upper casing  13 . Preferably, the base  1  further includes a bracket  15  connected perpendicularly to both the left wall  11  and the right wall  12  and located between the upper casing  13  and the bottom casing  14 . 
     The printing head assembly  4  is arranged on the base  1 , and is located at the downstream of the concave portion  17  in a printing paper transmission direction. The printing head assembly  4  includes a printing head  41 , at least one second elastic element  42 , and a support plate  43 . The support plate  43  is movably connected with the bracket  15  of the base  1 , and the printing head  41  is fixedly connected with the support plate  43  and located at a side of the support plate  43  away from the bracket  15 . The second elastic element  42 , which may be a pressure spring, a torsion spring or a plate spring, is located between the support plate  43  and the bracket  15 , and has one end connected with the support plate  43  and the other end connected with the bracket  15 . Under the effect of an elastic force applied by the second elastic element  42 , the support plate  43  and hence the printing head  41  always trend to move into the concave portion  17 . The base  1  is also provided with a positioning member (not shown) matching with the support plate  43 , and the support plate  43  of the printing head assembly  4  can be stabilized at a position distant from the bracket  15  by a predefined distance under the limitation by the positioning member. 
     Preferably, the printer further includes an elastic hook  7  arranged at the outer side of the bottom casing  14  and configured to hang the printer on a waist belt of the user for ease carry. 
     Preferably, notches  16  are symmetrically arranged on the inner sides of the left wall  11  and the right wall  12  of the base  1 , and openings of the notches  16  are respectively arranged at a side of the left wall  11  and a side of the right wall  12  that are away from the bottom casing  14 . The notch  16  has a width matching with a diameter of the core shaft  51  of the roller  5  of the paper storage  2 , has a length direction extending in an upper-and-down direction, and has a depth direction extending in a thickness direction of the walls. Preferably, the notch  16  has a tapered shape, to smoothly guide the core shaft  51  of the roller  5  into the notch  16 . 
     The second connection mechanism is arranged on the base  1 , and is configured to connect to the first connection mechanism on the paper storage  2 , so that the paper storage  2  and the base  1  are detachably connected.  FIG. 9  is a first view of installing of the paper storage into the printer according to the first embodiment of the present disclosure, and  FIG. 10  is a second view of installing of the paper storage into the printer according to the first embodiment of the present disclosure. As shown in  FIG. 9  and  FIG. 10 , the second connection mechanism includes a third connection member  31  and a fourth connection member  32 . 
     The third connection member  31  matches with the first connection member of the first connection mechanism on the paper storage  2 . When the first connection member is arranged on the bottom board  223  of the paper storage  2 , the third connection member  31  is arranged on the inner side of the bottom casing  14  of the base  1 , and when the first connection member is arranged on the outer sides of the left side wall  221  and the right side wall  222  of the paper storage  2 , the third connection member  31  is correspondingly arranged on the inner sides of the left wall  11  and the right wall  12  of the base  1 . When the paper storage  2  is installed on the base  1 , the first connection member and the third connection member  31  match with each other in a clamping manner. 
     In the present embodiment, the first connection member is embodied by the pivot shaft  211 , and the third connection member  31  is arranged on the inner side of the bottom casing  14  and has a groove shape. The third connection member  31  has a depth extending in the thickness direction of the walls, a length extending in a direction perpendicular to the left wall  11  and the right wall  12 , and a cross section of a shape matching with the shape of the cross section of the pivot shaft  211 . When the paper storage  2  is installed on the base  1 , the paper storage  2  is located in the concave portion, and the pivot shaft  211  on the paper storage  2  is clamped in the third connection member  31  on the bottom casing  14 , thereby limiting the movement of a side of the paper storage  2  close to the pivot shaft  211  toward the top and rear of the bottom cashing  14 . 
     The fourth connection member  32  is configured to match with the second connection member on the paper storage  2 . When the second connection member is embodied as the lock shaft, the fourth connection member  32  includes a lock hook  322 , and when the second connection member is embodied as the lock hook, the fourth connection member  32  is the lock shaft. In the present embodiment, the second connection member is the core shaft  51  of the roller  5 , and the fourth connection member  32  includes the lock hook  322 , a rotation shaft  321 , a third elastic element  323  and a button  324 . The rotation shaft  321  is supported by the left wall  11  and the right wall  12  of the base  1 , the lock hook  322  is pivoted with the base  1  through the rotation shaft  321 , where the lock hook  322  may be fixedly connected with the rotation shaft  321  and hence may be rotated synchronously with the rotation shaft  321 , or alternatively, the rotation shaft  321  may be sheathed in the lock hook  322  so that the lock hook  322  may be rotated about the rotation shaft  321 . 
     When the pivot shaft  211  of the paper storage  2  matches with the third connection member  31  of the base  1  in a clamping manner, the lock hook  322  may match with the core shaft  51  of the roller  5  in a clamping manner, to fix the position of the paper storage  2  relative to the base  1 . The third elastic element  323  has one end connected with the lock hook  322  and the other end connected with the base  1 . Under the effect of an elastic force applied by the third elastic element  323 , the lock hook  322  always trend to clamp and lock the core shaft  51  of the roller  5 . The button  324  is fixedly connected with the lock hook  322  and located at the outside of the base  1 , and triggering or pressing the button  324  by the user can cause the rotation of the lock hook  322 , so that the lock hook  322  is separated from the core shaft  51  of the roller  5 , thereby allowing detachment of the paper storage  2  from the base  1 . 
     Specifically the fourth connection member  32  in the present embodiment includes two lock hooks  322  which are integrated and fixedly connected with both ends of the rotation shaft  321 , respectively. The rotation shaft  321  is supported by the left wall  11  and the right wall  12  of the base  1 , and these two lock hooks  322  are rotatable about the axis of the rotation shaft  321  synchronously with the rotation shaft  321 . The third elastic element  323  has one end connected with the base  1  and the other end connected with the lock hooks  323 . The button  324 , which is located at the outside of the upper casing  13  of the base  1 , is connected with an intermediate portion between the two lock hooks  322 . When the pivot shaft  211  of the paper storage  2  matches with the third connection member  31  on the base  1  in a clamping manner, the lock hooks  322  match with the core shaft  51  of the roller  5  in a clamping manner, to fix the position of the paper storage  2  relative to the base  1 . When the user triggers or presses the button  324 , the button  324  causes the rotation of the lock hooks  322 , so that the lock hooks  322  are separated from the core shaft  51  of the roller  5 , thereby allowing detachment of the paper storage  2  from the base  1 . 
     The procedure of replacing the paper storage in the printer is described below. 
     To install the paper storage  2 , the pivot shaft  211  of the paper storage  2  is firstly clamped in the third connection member  31  on the base  1 , and then the paper storage  2  is rotated about the pivot shaft  211  so that the paper storage  2  is rotated to approach the printing head  41 . When the paper storage  2  entirely enters into the concave portion  17 , the paper storage  2  is pressed so that the core shaft  51  of the roller  5  on the paper storage  2  pushes the lock hook  322  to rotate by overcoming the elastic force applied by the third elastic element  323 . When the chassis  22  of the paper storage  2  contacts and matches with the bottom casing  14  of the base  1 , the lock hook  323  matches with the core shaft  51  in a clamping manner under the effect of the elastic force applied by the third elastic element  323 , in this way, one end of the paper storage  2  matches with the lock hook  322  in a clamping manner through the core shaft  51  of the roller  5 , and the other end of the paper storage  2  matches with the clamping member  312  on the base  1  in a clamping manner through the pivot shaft  211 , so that the position of the paper storage  2  relative to the base  1  is fixed. Meanwhile, the roller wheel  52  of the roller  5  is tangential to the printing head  41  at the opening of the paper storage, with the printing paper passing through the roller  5  and the printing head  41 . 
     To detach the paper storage  2 , firstly the button  324  is triggered or pressed, so that the lock hook  322  is rotated to be detached from the core shaft  51  of the roller  5  and the paper storage  2  can be rotated about the pivot shaft  211 , then the paper storage  2  is rotated to be away from the printing head  41 , and the pivot shaft  211  on the paper storage  2  is detached from the third connection member  31  on the base  1 , thereby detaching the paper storage  2  from the base  1  of the printer. 
     In the use of the printer in the present disclosure, after the paper storage is installed in the paper storage, the printing paper passes by the roller of the paper storage and is exposed at the opening of the paper storage, and the user is allowed to select a paper storage accommodating a corresponding type of paper roll depending on a specific case. The installing and replacing of the paper storage only requires for the matching between the first connection member on the paper storage and the third connection member on the base and between the second connection member on the paper storage and the fourth connection member on the base, as such, the paper storage is locked at a fixed position relative to the base, in this case, the roller of the paper storage tangentially matches with the printing head at the opening of the paper storage, the printing paper within the paper storage is sandwiched between the roller of the paper storage and the printing head at the opening of the paper storage, and printing can be performed on the printing paper by the printing head. Meanwhile, the paper storage can be wholly removed from the printer to detach the paper storage. Therefore, compared with the prior art, the printer in the present disclosure eliminates the need for opening of the upper cover of the printer to load the paper during the replacement of the paper storage and the need for respective detachment of various parts of the paper storage, thus the operations are simplified, and the work efficiency on site is improved. 
     It is noted that, in the above embodiments, the paper storage is installed on the base through the clamping structure and the locking mechanism. In another embodiment, the user is allowed to press the paper storage into the concave portion by a finger to implement the printing by the paper storage, in this case, the provision of the clamping structure and/or the locking mechanism is eliminated. In still another embodiment, the paper storage and the base match with each other in position by means of an external bracket. 
     It is noted that the printing head on the base may be replaced by other processing devices such as a scanning head. 
       FIG. 11  is a partial structural section view of the printer according to a second embodiment of the present disclosure. As shown in  FIG. 11 , the present embodiment differs from the preceding embodiment in that: a first elastic element declining toward the paper storage  2  is arranged in the concave portion  17  of the base  1  in the present embodiment, so that the paper storage always trends to move away from the concave portion, where one end of the first elastic element is connected with the concave portion  17  and the other end of the first elastic element is suspended. In the present embodiment, the first elastic element is an elastic slice  8 . In other embodiments, the first elastic element may be of other structural forms such as a pressure spring. 
     In installing the paper storage  2 , after the pivot shaft  211  on the paper storage  2  matches with the third connection member  31  on the base  1  in a clamping manner, the paper storage  2  is pressed against the elastic force applied by the elastic slice  8 , meanwhile the lock hook  322  is driven against the elastic force applied by the third elastic element  323 , until the lock hook  322  matches with the core shaft  51  of the roller  5  in a clamping manner. In detaching the paper storage  2 , the button  324  is pressed so that the paper storage  2  is automatically rotated about the pivot shaft  211  under the effect of the elastic force applied by the elastic slice  8 , thus the front end of the paper storage  2  is lifted up and hence the paper storage  2  can be easily removed. 
     With the arrangement of the elastic slice in the base in the present embodiment, when the button is pressed to detach the paper storage, the elastic lice can automatically lift up the paper storage, thereby further simplifying the operation steps of replacing the paper storage. 
       FIG. 12  is a first view of installing of a paper storage into a printer according to a third embodiment of the present disclosure, and  FIG. 13  is a second view of installing of a paper storage into a printer according to the third embodiment of the present disclosure. As shown in  FIG. 12  and  FIG. 13 , the printer and the paper storage provided in the present embodiment differ from the previous embodiments in that: the first connection member of the paper storage  2  in the present embodiment includes two clamping parts  33 , which are respectively arranged at the outer sides of the left side wall  221  and the right side wall  222  of the chassis  22  and located at a side away from the opening  224 ; and the third connection member of the printer includes two clamping slots  34 , which are correspondingly arranged on the inner surfaces of the left wall  11  and the right wall  12  of the base, and have a depth extending in the thickness direction of the walls. 
     In installing the paper storage  2 , the clamping parts  33  on the paper storage  2  enter into the openings of the clamping slots  34  on the left wall  11  and the right wall  12 , and when the clamping parts  33  reach the bottoms of the clamping slots  34 , the paper storage  2  is rotated so that the core shaft  51  of the roller  5  enters into the opening of the notch  16  and matches with the lock hooks  322  in a clamping manner, thereby fixing the position of the paper storage  2  relative to the base  1 . In detaching the paper storage  2 , the button  324  is firstly triggered or pressed so that the lock hooks  322  are separated from the core shaft  51  of the roller  5 , then the paper storage  2  is rotated about the clamping parts  33  to lift up the front end of the paper storage  2 , and finally paper storage  2  is moved along the longitudinal direction of the clamping slots  34  to detach the paper storage  2  from the base  1 . 
     The present disclosure also provides a method of using multiple types of mediums. Herein, a medium processing system is provided and includes one medium processing device and a plurality of paper storages. To utilize a different type of medium, a paper storage accommodating this type of medium is combined with the base of the medium processing device, where the medium is discharged from the medium outlet of the paper storage after passing by the roller of the paper storage, and the medium processing device matches with the roller via the opening of the paper storage for the purpose of processing the medium. 
     Preferably, the medium processing system is a printing system, and the medium processing device is a printer. 
     The above medium processing system is advantageous in that: depending on different types of medium processing operations such as the printing operations and scanning operations, paper storages accommodating different mediums may be selectively adopted, and the replacement of the medium is very convenient and rapid. 
     Some preferred embodiments of the present disclosure have been described as above, but the scope of the present disclosure is not limited thereto, and various modifications and alternations may be made to the present disclosure by those of ordinary skills in the art. Any modifications, equivalent replacements and improvements made without departing from the spirit and principles of the present disclosure fall within the scope of the present disclosure.