Abstract:
An inkjet printer which is finely adjustable as to elevation above a printing medium includes an inkjet head and an adjustment module. The adjustment module includes a magnetic track, a platen, and two electromagnetic elements. The platen supports the printing medium and the two electromagnetic elements are coupled to a power source. The two electromagnetic elements can slide in the magnetic track, and are moveable relative to the magnetic track in a direction perpendicular to the printing medium, to adjust a distance between the inkjet head and the printing medium. A printing system is also provided.

Description:
FIELD 
     The subject matter herein generally relates to an inkjet printer and a printing system. 
     BACKGROUND 
     An inkjet printer jets ink onto a printing medium to print a picture. A distance between a inkjet head and the printing medium should be kept at a constant level, so as to optimize a printing quality. When the above distance becomes smaller, the ink jet range is shortened, a greater number of pixels can be printed on the same area, and a better picture quality is achieved. Conversely, if the distance is enlarged, the printed pixels become smaller. When the distance gets too large, the shape of the pixel is deformed, and the quality of the printed picture will be degraded. Likewise, if the distance is too small, the printing quality may also be affected and the printer head module may track through and pick up wet ink on the printing medium. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
         FIG. 1  is a block diagram of an embodiment of a printing system of the present disclosure. 
         FIG. 2  is a block diagram of an embodiment of an inkjet printer of the present disclosure. 
         FIG. 3  is an assembled, isometric view of the inkjet printer of  FIG. 2 . 
         FIG. 4  is an exploded, isometric view of the inkjet printer of  FIG. 2 . 
         FIG. 5  is a front view of an inkjet head of the inkjet printer of  FIG. 2  connected to a magnetic track. 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
     Several definitions that apply throughout this disclosure will now be presented. 
     The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently coupled or releasably coupled. The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like. 
     The disclosure will now be described in relation to a printing system. 
       FIG. 1  illustrates an embodiment of a printing system  400 . 
     The printing system  400  comprises an inkjet printer  100 , a media medium  200 , and a power source  300 . The inkjet printer  100  is configured to print onto the media medium  200 . The power source  300  is configured to supply power to the inkjet printer  100 . 
     In one embodiment, the media medium  200  can be a paper inkjet printer  100  used for any inkjet printing. 
       FIG. 2  illustrates an embodiment of the inkjet printer  100 . 
     The inkjet printer  100  comprises an inkjet head  10  and an adjustment module  20 . The inkjet head  10  is configured to jet out ink to the media medium  200 . The adjustment module  20  is configured to adjust a distance between the inkjet head  10  and the media medium  200 . 
     In one embodiment, an inkjet head is rectangular in cross section. 
     Referring to  FIG. 3  and  FIG. 4 , the adjustment module  20  comprises a platen  30 , a magnetic track  40 , and two electromagnetic elements  50 . 
     The platen  30  is configured to support the media medium  200 . Thereby, a media medium printing surface is facing an inkjet head nozzle. 
     The magnetic track  40  comprises a first slide rail  42  and a second slide rail  44  and two support frames  46 . The first slide rail  42  comprises a first top wall  421 , a first bottom wall  422 , and a first side wall  423 . The first top wall  421 , the first bottom wall  422 , and the first side wall  423  form a first groove  424 . The second slide rail  44  comprises a second top wall  441 , a second bottom wall  442 , and a second side wall  443 . The second top wall  441 , the second bottom wall  442 , and the second side wall  443  form a second groove  444 . The positions of the first groove  424  and the second groove  444  are fixed relative to each other. 
     The first top wall  421  and the second top wall  441  are in a first plane, the first bottom wall  422  and the second bottom wall  442  are in a second plane, and the first plane and the second plane are in parallel. 
     In one embodiment, the first slide rail  42  and the second slide rail  44  are magnetic bodies. The first slide rail  42  and the second slide rail  44  are configured to generate or react to a magnetic field. 
     The two support frames  46  have the same structure. Each of the two support frames  46  comprises a base arm  462  and two support arms  464 . The two support arms  464  are respectively connected to the first bottom wall  422  and the second bottom wall  442 . 
     The two electromagnetic elements  50  are mounted beside the inkjet head  10  and are parallel to each other. The two electromagnetic elements  50  are coupled to the power source  300  to receive power. 
     In one embodiment, the electromagnetic element  50  can be a electromagnet. A cross section of the electromagnetic element is rectangular. 
     Referring to  FIG. 5 , the electromagnetic element  50  comprises an electromagnetic element top half and an electromagnetic element bottom half. The power source  300  supplies power to the electromagnetic element top half and to the electromagnetic element bottom half. The electromagnetic element  50  further comprises an electromagnetic element upper surface  52  and an electromagnetic element lower surface  54 . A distance between the electromagnetic element upper surface  52  and the electromagnetic element lower surface  54  is less than a distance between a first top wall lower surface and a first bottom wall upper surface. Thereby, the two electromagnetic elements  50  can loosely slip into the first groove  424  and the second groove  444 , and the two electromagnetic elements  50  can move in the first groove  424  and the second groove  444 . 
     The two support frames  46  are installed on the platen  30  and the inkjet head  10  is fixed between the two electromagnetic elements  50 . 
     When the inkjet printer  100  is operating, the media medium  200  is put on the platen  30 . The media medium printing surface faces the inkjet head nozzle. When an electrical current to the electromagnetic element bottom half is greater than an electrical current to the electromagnetic element top half, a magnetic repulsion between the electromagnetic element bottom half and the magnetic track  40  is greater than a magnetic repulsion between the electromagnetic element top half and the magnetic track  40 . The two electromagnetic elements  50  lead the inkjet head  10  to move relative to the magnetic track  40  in a direction perpendicular to the media medium printing surface. 
     When a distance between the inkjet head  10  and the media medium printing surface is minimal, the inkjet printer  100  can increase the current to the electromagnetic element bottom half and decrease the current to the electromagnetic element top half. Thereby, the magnetic repulsion between the electromagnetic element bottom half and the magnetic track  40  is strengthened. The magnetic repulsion between the electromagnetic element top half and the magnetic track  40  is weakened, and the distance between the inkjet head  10  and the media medium printing surface is thereby increased. 
     When the distance between the inkjet head  10  and the media medium printing surface is greater or maximal, the inkjet printer  100  can decrease current to the electromagnetic element bottom half and increase current to the electromagnetic element top half. Thereby, the magnetic repulsion between the electromagnetic element bottom half and the magnetic track  40  is weakened. The magnetic repulsion between the electromagnetic element top half and the magnetic track  40  is strengthened, and the distance between the inkjet head  10  and the media medium printing surface is thereby decreased. 
     While the disclosure has been described by way of example and in terms of the embodiment, it is to be understood that the disclosure is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements as would be apparent to those skilled in the art. Therefore, the range of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.