Patent Publication Number: US-2023147281-A1

Title: Printing apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/939,998, filed Jul. 27, 2020, the contents of which is incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     Example embodiments of the present disclosure relate generally to a printing apparatus and, more particularly, to a print engine assembly in the printing apparatus. 
     BACKGROUND 
     A typical printer may include a print head that may be configured to print content on print media. The print head may correspond to a thermal print head, an ink jet print head, or a laser print head. The laser print head may include a laser light source that may be utilized, in one implementation, to ionize an ink toner to print content in the print media. In another implementation, the laser light source may be configured to directly point the laser onto the print media to print content on the print media. 
     BRIEF SUMMARY 
     Various embodiments described herein illustrate printing apparatus that includes a print engine assembly. The print engine assembly further includes a bottom chassis portion. The print engine assembly also includes a top chassis portion. The print engine assembly also includes a print head positioned within the top chassis portion. The print engine assembly also includes a plurality of offset pins coupled to the print head, where the plurality of offset pins abuts the bottom chassis portion, and where the plurality of offset pins enables the print head to be positioned at a predetermined distance from the bottom chassis portion. 
     Various embodiments described herein illustrate a print engine assembly that includes a bottom chassis portion. The print engine assembly also includes a top chassis portion. The print engine assembly also includes a print head positioned within the top chassis portion. The print engine assembly also includes a plurality of offset pins coupled to the print head, where the plurality of offset pins abuts the bottom chassis portion, and where the plurality of offset pins enables the print head to be positioned at a predetermined distance from the bottom chassis portion. Various embodiments described herein illustrate a print head that includes a top surface configured to be coupled to a top chassis portion of a print engine assembly, through at least one biasing member; and a bottom surface configured to be coupled to a plurality of offset pins, where the plurality of offset pins is configured to be abutting a top surface of a bottom chassis portion of the print engine assembly, where the plurality of offset pins enables the bottom surface of the print head to be positioned at a predetermined distance from the top surface of the bottom chassis portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The description of the illustrative embodiments can be read in conjunction with the accompanying figures. It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements are exaggerated relative to other elements. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the figures presented herein, in which: 
         FIG.  1    illustrates an example printing apparatus, according to one or more embodiments described herein; 
         FIG.  2    illustrates a perspective view of a print engine assembly, according to one or more embodiments described herein; 
         FIG.  3    illustrates an exploded view of the print engine assembly, according to one or more embodiments described herein; 
         FIG.  4    illustrates a bottom perspective view of a top chassis cap, according to one or more embodiments described herein; 
         FIG.  5    illustrates a bottom perspective view of a print head, according to one or more embodiments described herein; 
         FIG.  6    illustrates a perspective view of an offset pin, according to one or more embodiments described herein; 
         FIG.  7    illustrates another perspective view of an offset pin, according to one or more embodiments described herein; 
         FIG.  8    illustrates a top perspective view a top chassis portion, according to one or more embodiments described herein; 
         FIG.  9    illustrates a bottom perspective view of the top chassis portion, according to one or more embodiments described herein; 
         FIG.  10   a    illustrates a bottom perspective view of the top chassis portion without the print head, according to one or more embodiments described herein; 
         FIG.  10   b    illustrates a bottom perspective view of the top chassis portion with the print head, according to one or more embodiments described herein; 
         FIG.  11    illustrates a bottom perspective view of a bottom chassis portion, according to one or more embodiments described herein; 
         FIG.  12    illustrates a section view of the print engine assembly, according to one or more embodiments described herein; and 
         FIG.  13    illustrates a perspective view of the print engine assembly with the top chassis portion removed, according to one or more embodiments described herein. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Some embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the disclosure are shown. Indeed, these disclosures may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout. 
     Unless the context requires otherwise, throughout the specification and claims which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open sense, that is as “including, but not limited to.” 
     Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, one or more particular features, structures, or characteristics from one or more embodiments may be combined in any suitable manner in one or more other embodiments. 
     The word “example” or “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other implementations. 
     If the specification states a component or feature “may,” “can,” “could,” “should,” “would,” “preferably,” “possibly,” “typically,” “optionally,” “for example,” “often,” or “might” (or other such language) be included or have a characteristic, that a specific component or feature is not required to be included or to have the characteristic. Such component or feature may be optionally included in some embodiments, or it may be excluded. 
     The term “electronically coupled,” “electronically coupling,” “electronically couple,” “in communication with,” “in electronic communication with,” or “connected” in the present disclosure refers to two or more components being connected (directly or indirectly) through wired means (for example but not limited to, system bus, wired Ethernet) and/or wireless means (for example but not limited to, Wi-Fi, Bluetooth, ZigBee), such that data and/or information may be transmitted to and/or received from these components. 
     The terms “print media,” “physical print media,” “paper,” and “labels” refer to tangible, substantially durable physical material onto which text, graphics, images and/or the like may be imprinted and persistently retained over time. Physical print media may be used for personal communications, business communications, and/or the like to convey prose expression (including news, editorials, product data, academic writings, memos, and many other kinds of communications), data, advertising, fiction, entertainment content, and illustrations and pictures. Physical print media may be generally derivatives of wood pulp or polymers, and includes conventional office paper, clear or tinted acetate media, news print, envelopes, mailing labels, product labels, and other kinds of labels. Thicker materials, such as cardstock or cardboard may be included as well. More generally, print media may be used to receive ink, dye, or toner, or may be a media whose color or shading can be selectively varied (for example, through selective application of heat, light, or chemicals) to create a persistent visual contrast (in black and white, shades of gray, and/or colors) that can be perceived by the human eye as texts, images, shapes, symbols, or graphics. In another example, the print media may be chemically treated such that when light falls on the print media, the color of the print media changes. Such print media may be used in the laser printers. In exemplary embodiments discussed throughout this document, reference may be made specifically to “paper” or “labels;” however, the operations, system elements, and methods of such exemplary applications may be applicable to media other than or in addition to the specifically mentioned “paper” or “labels.” 
     The terms “printer” and “printing apparatus” refer to a device that may imprint texts, images, shapes, symbols, graphics, and/or the like onto print media to create a persistent, human-viewable representation of the corresponding texts, images, shapes, symbols, graphics, and/or the like. Printers may include, for example, laser printers. 
     For optimum operation of a printing apparatus in which the laser light source may be configured to directly point the laser onto the print media, various prerequisites need to be taken in to account prior to printing operation. Some example of the prerequisites may include, but not limited to, an orientation of the print media with respect to the print head, a focal point of the laser light source with respect to the location of the print media, and/or the like. 
     Apparatuses described herein disclose a printing apparatus that includes a print engine assembly. The print engine assembly includes a bottom chassis portion and a top chassis portion. The bottom chassis portion may include a platform that is configured to receive print media for printing content. On the other hand, the top chassis portion may be configured to receive a print head. In some examples, the print head corresponds to a Laser print head that may be configured to cause the Laser light to fall on the print media in a predetermined pattern. This may lead to printing content on the print media. 
     In some examples, the print head is positioned at a predetermined distance from the bottom chassis portion through a plurality of offset pins. In some examples, the plurality of offset pins may be coupled to the print head such that the plurality offset pins extend out from the print head and abut the platform defined on the bottom chassis portion. In some examples, the predetermined distance (maintained between the bottom chassis portion and print head) may be equitable to the focal length of the laser light source unit (in the print head). In such an example, maintaining the print head at the predetermined distance from the bottom chassis portion ascertains that the focal point of the laser light source unit is not disturbed during the printing operation. 
       FIG.  1    illustrates an example printing apparatus  100 , according to one or more embodiments described herein. While not shown in  FIG.  1   , the printing apparatus  100  may comprise a power source, as well as a printer cover for housing various components in the interior of the printing apparatus  100 . 
     The printing apparatus  100  may include a media supply roll  102 . The media supply roll  102  may comprise print media  104  that may be wound on the media supply spool  106 . In the example shown in  FIG.  1   , the printing apparatus  100  may comprise a media supply spindle  108 , and the media supply spool  106  may be configured to be disposed on the media supply spindle  108 . 
     In some examples, the printing apparatus  100  may comprise a media guiding spindle  110 , which may be positioned to guide the print media from the media supply roll  102  to travel in a print direction along a print path within the printing apparatus  100 . In some examples, the print path may correspond to a path between the media supply spindle  108  to an exit slit  112  along which the print media travels. Further, in some examples, the print direction may correspond to a direction along which the print media travels for the printing operation. In some examples, after texts, graphics, images and/or the like (as applicable) are imprinted on the print media, the print media may exit from the printing apparatus  100  from the exit slit  112 . 
     In some examples, the printing apparatus  100  may comprise one or more motors (not shown) for rotating the media supply spool  106  disposed on the media supply spindle  108  in an anti-clockwise rotational direction, causing the print media to travel in the print direction along the print path. Additionally, or alternatively, the one or more motors may rotate the media guiding spindle  110  in the anti-clockwise rotational direction, causing the print media to travel in the print direction along the print path. Additionally, or alternatively, the one or more motors may rotate the media supply spool  106  and/or the media guiding spindle  110  in a clockwise rotational direction causing the print media to travel in a direction opposite to the print direction. 
     In some examples, the media supply spindle  108  and/or the media guiding spindle  110  may be eliminated, and the print media  104  may be fed into the printing apparatus  100  through an opening slit, and may exit from the printing apparatus  100  through an exit slit  112 . 
     In some examples, the printing apparatus  100  may include a graphical user interface (GUI)  114  for enabling communications between a user and the printing apparatus  100 . The GUI  114  may be communicatively coupled to other components of the printing apparatus  100  for displaying visual and/or auditory information and/or for receiving information from the user (e.g., typed, touched, spoken, etc.). 
     In the example shown in  FIG.  1   , the printing apparatus  100  may include the GUI  114  with, for example, a display  116  and a keypad  118 . The display  116  may be configured to display various information associated with the printing apparatus  100 . The keypad  118  may comprise function buttons that may be configured to perform various typical printing functions (e.g., cancel print job, advance print media, and the like) or be programmable for the execution of macros containing preset printing parameters for a particular type of print media. In some examples, the GUI  114  may be electronically coupled to a controller for controlling operations of the printing apparatus  100 , in addition to other functions. The GUI  114  may be supplemented or replaced by other forms of data entry or printer control, such as a separate data entry and control module linked wirelessly or by a data cable operationally coupled to a computer, a router, or the like. 
     While  FIG.  1    illustrates an example GUI  114 , it is noted that the scope of the present disclosure is not limited to the example GUI  114  as shown in  FIG.  1   . In some embodiments, the user interface may be different from the one depicted in  FIG.  1   . In some embodiments, there may not be a user interface. 
     Referring back to  FIG.  1   , the printing apparatus  100  may comprise a back-spine section  120 . In some examples, the back-spine section  120  may be made of material having rigid characteristics, such as aluminum alloy, stainless steel, and/or the like. In some examples, the back-spine section  120  may comprise a first surface  122 . The first surface  122  may be in a perpendicular arrangement with a surface  124  of a printer base  126 . 
     In some examples, at least one linear guide may be disposed on a surface of an example back-spine section of an example printer body. In some examples, each of at least one linear guide may comprise a corresponding linear rail and a corresponding linear block. In some examples, the corresponding linear rail may be fastened to the first surface of the back-spine section through, for example, bolts, screws, and/or the like. In some examples, the corresponding linear block may be coupled to the corresponding linear rail through, for example, ball bearings, rollers, and/or the like, such that the corresponding linear block may move and/or slide along the corresponding linear rail. Example linear guides may include, but not limited to, rolling element linear motion bearing guides, sliding contact linear motion bearing guides, and/or the like. 
     For example, in  FIG.  1   , a first linear guide  128 A and a second linear guide  128 B may be disposed on the first surface  122 . The first linear guide  128 A may, for example, comprise a linear rail fastened to the first surface  122  of the back-spine section  120 , as well as a corresponding linear block (now shown) that is coupled to the linear rail and movable along the linear rail. Additionally, or alternatively, the second linear guide  128 B may comprise a linear rail disposed on the first surface  122  of the back-spine section  120 , and a corresponding linear block. In an example embodiment, the first linear guide  128 A and the second linear guide  128 B are positioned parallel to each other and may be positioned along a vertical axis  136  of the printing apparatus  100 . 
     In some examples, a print engine assembly  130  of the printing apparatus  100  may be coupled to the first linear guide  128 A and the second linear guide  128 B through the corresponding linear block of the first linear guide  128 A and second linear guide  128 B, respectively. In an example embodiment, the print engine assembly  130  comprises a top chassis portion  132  and a bottom chassis portion  134 . In some examples, the top chassis portion  132  of the print engine assembly  130  may be coupled to the first linear guide  128 A and the second linear guide  128 B through the corresponding linear block of the first linear guide  128 A and second linear guide  128 B, respectively. Further, in some examples, as the top chassis portion  132  may move along the linear rail(s) of first linear guide  128 A and/or the second linear guide  128 B along the vertical axis  136  of the printing apparatus  100 . 
     In some examples, the bottom chassis portion  134  may be fastened to the first surface  122  of the back-spine section  120 . In some examples, the bottom chassis portion  134  may be positioned under the top chassis portion  132  in the vertical axis  136  and may be configured to receive the print media from the media supply roll  102 . 
     In some examples, as the top chassis portion  132  may move along the vertical axis  136  along its corresponding travel path, the top chassis portion  132  may reach and/or be positioned at a bottom point of the travel path in the vertical axis  136 . When the top chassis portion  132  is positioned at the bottom point, the top chassis portion  132  may be removably coupled to the bottom chassis portion  134  through a latch  138 . 
     The structure of the print engine assembly  130  is further described in conjunction with  FIGS.  2  and  3   . 
       FIG.  2    illustrates a perspective view of the print engine assembly  130 , according to one or more embodiments described herein. In an example embodiment, the print engine assembly  130  includes the top chassis portion  132 , the bottom chassis portion  134 , and a top chassis cap  202 . 
     In an example embodiment, the top chassis portion  132  has an outer surface  204  that may define a top end portion  206  and a bottom end portion  208 , which does not include the top chassis cap  202 . The top end portion  206  and the bottom end portion  208 , of the top chassis portion  132 , are spaced apart from each other along the vertical axis  136  of the printing apparatus  100 . Further, in some examples, the bottom end portion  208  may be defined to be proximal to the bottom chassis portion  134 , while the top end portion  206  may be defined to be distal from the bottom chassis portion  134 , when the top chassis portion  132  is coupled to the bottom chassis portion  134 . 
     In some examples, the top chassis portion  132  may have a rectangular shape with one or more sides  210   a ,  210   b ,  210   c , and  210   d . The side  210   a  and the side  210   c  may be defined to be opposite to each other along a longitudinal axis  214  of the print engine assembly  130 . Similarly, the side  210   b  and the side  210   d  may be defined to be opposite to each other along a lateral axis  212  of the print engine assembly  130 . In some examples, the scope of the disclosure is not limited to the top chassis portion  132  having a rectangular shape. In an example embodiment, the shape of the top chassis portion  132  may correspond to other polygons, without departing from the scope of the disclosure. 
     In an example embodiment, the outer surface  204  of the top chassis portion  132  defines a first wing portion  216  that protrudes out from the side  210   b  of the top chassis portion  132  along the lateral axis  212  of the print engine assembly  130 . Additionally, the first wing portion  216  extends from the side  210   a  to the side  210   c  along the longitudinal axis  214  of the print engine assembly  130 . In some examples, a length of the first wing portion  216  (along the longitudinal axis  214 ) may be same as a length of the top chassis portion  132  (along the longitudinal axis  214 ). Further, a height of the first wing portion  216  is less than a height of the top chassis portion  132 . Accordingly, along the vertical axis  136  of the printing apparatus  100 , the first wing portion  216  may define a step  218  with the side  210   b.    
     In an example embodiment, similar to the first wing portion  216 , the outer surface  204  of the top chassis portion  132  defines a second wing portion  220  that protrudes out from the side  210   d  of the top chassis portion  132  along the lateral axis  212  of the print engine assembly  130 . Additionally, the second wing portion  220  extends from the side  210   a  to the side  210   c  along the longitudinal axis  214  of the print engine assembly  130 . In some examples, a length of the second wing portion  220  (along the longitudinal axis  214 ) may be same as the length of the top chassis portion  132  (along the longitudinal axis  214 ). Further, a height of the second wing portion  220  is less than the height of the top chassis portion  132 . Accordingly, along the vertical axis  136  of the printing apparatus  100 , the second wing portion  220  may define a step  222  with the side  210   d.    
     In an example embodiment, the side  210   a  is further configured to receive the latch  138  that facilitates removable coupling of the top chassis portion  132  with the bottom chassis portion  134 . 
     In an example embodiment, as discussed above, the bottom chassis portion  134  is fixed to the first surface  122  of the back-spine section  120  (refer  FIG.  1   ). Additionally, the bottom chassis portion  134  has an outer surface  224 . In some examples, the outer surface  224  of the bottom chassis portion  134  defines a top end portion  226  of the bottom chassis portion  134 , and a bottom end portion  228  of the bottom chassis portion  134 . The bottom end portion  228  of the bottom chassis portion  134  is spaced apart from the top end portion  226  of the bottom chassis portion  134  along the vertical axis  136  of the print engine assembly  130 . Further, the top end portion  226  of the bottom chassis portion  134  is proximal to the bottom end portion  208  of the top chassis portion  132 , while the bottom end portion  228  of the bottom chassis portion  134  is distal from the bottom end portion  208  of the top chassis portion  132 . 
     In an example embodiment, the outer surface  224  of the bottom chassis portion  134  defines at least two sides  230   a  and  230   b  of the bottom chassis portion  134 . In an example embodiment, the side  230   a  may be spaced apart from the side  230   b  along the longitudinal axis  214  of the print engine assembly  130 . In an example embodiment, the sides  230   a  has a first edge  232  and a second edge  234 . In some examples, the first edge  232  is spaced apart from the second edge  234  along the lateral axis  212  of the print engine assembly  130 . Similar to the side  230   a , the side  230   b  has a third edge  252  and a fourth edge  254  (Refer  FIG.  3   ). In some examples, the third edge  252  is spaced apart from the fourth edge  254  (refer  FIG.  3   ) along the lateral axis  212  of the print engine assembly  130 . 
     In an example embodiment, the outer surface  224  of the bottom chassis portion  134  may define a first circular notch  236  and a second circular notch  238  on the side  230   a . Further, the first circular notch  236  and the second circular notch  238  are defined (by the outer surface  224  of the bottom chassis portion  134 ) at the top end portion  226  of the bottom chassis portion  134 . Furthermore, the outer surface  224  of the bottom chassis portion  134  defines the first circular notch  236  proximal to the first edge  232  of the side  230   a , and the second circular notch  238  proximal to the second edge  234  of the side  230   a . Similarly, the outer surface  224  of the bottom chassis portion  134  may define a third circular notch  240  (refer  FIG.  3   ) and a fourth circular notch  242  (refer  FIG.  3   ) on the side  230   b  at the top end portion  226  of the bottom chassis portion  134 . Further, the outer surface  224  defines the third circular notch  240  proximal to the third edge  252  of the side  230   b , and the fourth circular notch  242  proximal to the fourth edge  254  of the side  230   b . In some examples, the first circular notch  236  and the third circular notch  240  may have a coinciding central axis  244  (refer  FIG.  3   ) extending along the longitudinal axis  214  of the print engine assembly  130 . Similarly, the second circular notch  238  and the fourth circular notch  242  may have a coinciding central axis  246  (refer  FIG.  3   ) extending along the longitudinal axis  214  of the print engine assembly  130 . 
     In an example embodiment, the first circular notch  236  and the third circular notch  240  are configured to receive a first shaft  248  such that the first shaft  248  is rotatable in the first circular notch  236  and the third circular notch  240 . Additionally, the third circular notch  240  and the fourth circular notch  242  are configured to receive a second shaft  250  such that the second shaft  250  is rotatable in the second circular notch  238  and the fourth circular notch  242 . In some examples, the first shaft  248  and the second shaft  250  may correspond to rollers that may assist the travel of the print media  104  along the print path. 
       FIG.  3    illustrates an exploded view of the print engine assembly  130 , according to one or more embodiments described herein. 
     In an example embodiment, the top chassis cap  202  has an outer surface  302  that may define a top end portion  304  of the top chassis cap  202  and a bottom end portion  306  of the top chassis cap  202 . In some examples, the bottom end portion  306  of the top chassis cap  202  may abut the top end portion  206  of the top chassis portion  132  when the top chassis cap  202  is received on the top chassis portion  132 . The structure of the bottom end portion  306  of the top chassis cap  202  is further described in conjunction with  FIG.  4   . 
     Referring to  FIG.  4   , a bottom perspective view of the top chassis cap  202  is illustrated, according to one or more embodiments described herein. The bottom end portion  306  of the top chassis cap  202  may define one or more protrusions  402  and  404  that may orthogonally extend out from the bottom end portion  306  of the top chassis cap  202 . In some examples, the one or more protrusions  402  and  404  may be spaced apart along the longitudinal axis  214  of the print engine assembly  130 . The one or more protrusions  402  and  404  may be configured to receive at least one biasing member. For example, the one or more protrusions  402  and  404  are configured to receive a first biasing member  308  and a second biasing member  310 , respectively. In some examples, each of the first biasing member  308  and the second biasing member  310  has a first end  406  and a second end  408 . The first end  406  of the first biasing member  308  is configured to be coupled to the protrusion  402 . Further, the first end  406  of the second biasing member  310  is configured to be coupled to the protrusion  404 . In some examples, the second end  408  of the first biasing member  308  and the second end  408  of the second biasing member  310  are configured to be coupled to a print head  316 . The structure of the print head  316  is herein described in conjunction with  FIG.  3    and  FIG.  5   . 
       FIG.  5    illustrates a bottom perspective view of the print head  316 , according to one or more embodiments described herein. Referring to  FIG.  3    and  FIG.  5   , in an example embodiment, the print head  316  has an outer surface  318  that defines a top end portion  320  and a bottom end portion  322 , of the print head  316 . In some examples, the top end portion  320  of the print head  316  is configured to be coupled to the second end  408  of the first biasing member  308  and the second end  408  of the second biasing member  310 . Accordingly, the print head  316  is configured to be coupled to the top chassis cap  202  through the first biasing member  308  and the second biasing member  310 . In some examples, the scope of the disclosure is not limited to two biasing members being coupled to the print head  316 . In an example embodiment, a single biasing member or more than two biasing members may be coupled to the print head  316 , without departing from the scope of the disclosure. 
     Hereinafter, the outer surface  318  of the print head  316  at the top end portion  320  of the print head  316  is referred as a top surface  330  of the print head  316 . Further, hereinafter, the outer surface  318  of the print head  316  at the bottom end portion  322  of the print head  316  is referred as a bottom surface  332  of the print head  316 . 
     Referring to  FIG.  5   , in an example embodiment, the bottom surface  332  defines one or more laser recesses  510 . Each of the one or more laser recesses  510  is configured to receive a laser light source unit  512 . In some examples, the laser light source unit  512  includes a laser light source  514  and an optical assembly  516 . The optical assembly  516  is configured to focus the light from the laser light source  514  on the bottom chassis portion  134  to print content on the print media  104 . 
     In an example embodiment, the print head  316  has substantially rectangular shape with one or more sides  324   a ,  324   b ,  324   c , and  324   d . In some examples, the scope of the disclosure is not limited to the print head  316  having the rectangular shape. In an example embodiment, the print head  316  may have any other shape, without departing from the scope of the disclosure. In some examples, the sides  324   a  and  324   c  of the print head  316  are spaced apart from each other along the longitudinal axis  214  of the print engine assembly  130 . Further, the sides  324   b  and  324   d  of the print head  316  are spaced apart from each other along the lateral axis  212  of the print engine assembly  130 . 
     In an example embodiment, the outer surface  318  of the print head  316  further defines a first flange region  326  and a second flange region  328  on the side  324   a  such that the first flange region  326  and the second flange region  328  extend out from the side  324   a  along the longitudinal axis  214  of the print engine assembly  130 . Further, the first flange region  326  is spaced apart from the second flange region  328  along the lateral axis  212  of the print engine assembly  130  such that a distance between the first flange region  326  and the second flange region  328  is less than a width of the print head  316  (along the lateral axis  212  of the print engine assembly  130 ). In some examples, the first flange region  326  comprises a bottom end  334  and a top end  336 . The bottom end  334  of the first flange region  326  coincides with the bottom end portion  322  of the print head  316 . Further, the top end  336  of the first flange region  326  is defined to be distal from the bottom end portion  322  of the print head  316 . In some examples, a width of the first flange region  326  along the vertical axis  136  of the printing apparatus  100  is less than a height of the print head  316  (along the vertical axis  136  of the printing apparatus  100 ). Accordingly, the first flange region  326  defines a step  338  with the side  324   a  of the print head  316 . Additionally, the outer surface  318  of the print head  316  defines a recess  342  in the first flange region  326  such that the recess  342  extends from the bottom end  334  of the first flange region  326  towards the top end  336  of the first flange region  326 . In some examples, the recess  342  extends along the vertical axis  136  of the printing apparatus  100 . 
     In an example embodiment, the structure of the second flange region  328  is similar to the first flange region  326 . For example, the second flange region  328  has a bottom end  344 , a top end  346 , and a recess  348  (that extends from the bottom end  344  of the second flange region  328  towards the top end  346  of the second flange region  328 ). 
     Similar to the first flange region  326  and the second flange region  328 , the outer surface  318  of the print head  316  defines a third flange region  340  and a fourth flange region  502  (refer  FIG.  5   ) on the side  324   c . In some examples, the third flange region  340  and the fourth flange region  502  have structure same as the structure of the first flange region  326 . For example, the width of each of the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502  (along the vertical axis  136  of the printing apparatus  100  is same. Further, similar to the first flange region  326 , the third flange region  340  and the fourth flange region  502  has a recess  504  and  506  (refer  FIG.  5   ), respectively. It may be appreciated that the defining the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502  may have different widths and/or different size without departing from the scope of the disclosure. 
     In an example embodiment, the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502  are configured to receive a plurality of offset pins. For example, the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region (not visible) are configured to receive the plurality of offset pins  350   a ,  350   d ,  350   b , and  350   c , respectively. In some examples, a structure of the each offset pin of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  is same and is further described in conjunction with  FIG.  6    and  FIG.  7   . 
     In some examples, the scope of the disclosure is not limited to the outer surface  318  of the print head  316  defining the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502  on the sides  324   a  and  324   c . In an example embodiment, the outer surface  318  of the print head  316  may define the first flange region  326 , and the second flange region  328  on the side  324   b  of the print head  316 . To this end, the outer surface  318  may define the third flange region  340  and the fourth flange region  502  on the side  324   d . In some examples, the outer surface  318  may define only two flange regions such that the two flange regions may be positioned diagonally opposite to each other. For example, the outer surface  318  may define the first flange region  326  and the fourth flange region  502 . In yet another embodiment, the outer surface  318  may define the second flange region  328 , and the third flange region  340 . In some examples, the scope of the disclosure is not limited to the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502 , defined at a plurality of corners of the print head  316 . In an example embodiment, the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502  may be defined at a middle of each side  324   a ,  324   b ,  324   c , and  324   d  of the print head  316 , without departing from the scope of the disclosure. Further, various other positions of the flange regions may be contemplated, without departing from the scope of the disclosure. In some examples, the scope of the disclosure is not limited to the print head  316  having four flanges. In an example embodiment, the print head  316  may have more than four flanges. 
     In some examples, the print head  316  may not include any flange region. In such an implementation, the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may be received at the bottom end portion  322  of the print head  316 . For example, the bottom end portion  322  of the print head  316  may receive the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  at the plurality of corners. In an example embodiment, the plurality of corners of the print head  316  may defined at regions where two or more sides of the print head  316  meet. In such an implementation, the outer surface  318  may define the recesses  342 ,  348 ,  504  and  506  at the plurality of corners of the print head  316 , where the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may be received within recesses  342 ,  348 ,  504  and  506  (defined at the plurality of corners of the print head  316 ). 
     In some examples, the scope of the disclosure is not limited to the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  as separate components. In an example embodiment, bottom surface  332  of the print head  316  may define one or more protrusions in each of the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502  such that the one or more protrusions may extend out orthogonally from the bottom end portion  322  of the print head  316 . In an example embodiment, the one or more protrusions may correspond to the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d . In scenarios, where the outer surface  318  of the print head  316  does not define the defining the first flange region  326 , the second flange region  328 , the third flange region  340  and the fourth flange region  502 , the bottom surface  332  of the print head  316  may define the one or more protrusions at the plurality of corners of the print head  316 . In some examples, the scope of the disclosure is not limited to defining the one or more protrusions (as the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d ) at the plurality of corners of the print head  316 . In an example embodiment, the bottom surface  332  of the print head  316  may define the one or more protrusions (as the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d ) at any other position other than the plurality of corners of the print head  316 . For example, the bottom surface  332  of the print head  316  may define the one or more protrusions (as the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d ) at the bottom end portion  332  such that the one or more protrusions are defined at the middle of each of the one or more sides each side  324   a ,  324   b ,  324   c , and  324   d  of the print head  316 . 
       FIG.  6    illustrates a perspective view of the offset pin  350   a , according to one or more embodiments described herein. In an example embodiment, the offset pin  350   a  has a cylindrical shape and comprises a first end  602 , a second end  604 , a print head facing portion  606 , and a bottom chassis facing portion  608 . In some examples, the first end  602  is spaced apart from the second end  604  along the vertical axis  136  of the print engine assembly  130 . Further, in some examples, the first end  602  of the offset pin  350   a  and the second end  604  of the offset pin  350   a , may have a hemi-spherical shape. In some examples, the scope of the disclosure is not limited to the first end  602  and the second end  604  having the hemispherical shape. In an example embodiment, the first end  602  and the second end  604 , of the offset pin  350   a , may have any other shape, without departing from the scope of the disclosure. For example, the first end  602  and the second end  604  of the offset pin  350   a  are pointed. In yet another example, the first end  602  and the second end  604  of the offset pin  350   a  may have a conical shape, without departing from the scope of the disclosure. 
     In an example embodiment, the bottom chassis facing portion  608  extends from the first end  602  to a junction  610  between the bottom chassis facing portion  608  and the print head facing portion  606 . The print head facing portion  606  extends from the junction  610  (between the print head facing portion  606  and the bottom chassis facing portion  608 ) and the second end  604 . In an example embodiment, a diameter of the print head facing portion  606  is less than a diameter of the bottom chassis facing portion  608 . Accordingly, a step  612  is defined at the junction  610  between the print head facing portion  606  and the bottom chassis facing portion  608 . 
     As discussed, the offset pin  350   a  is configured to be received in the recess  342  defined in the first flange region  326 . In some examples, the print head facing portion  606  of the offset pin  350   a  is configured to be received within the recess  342  of the first flange region  326  such that the step  612  on the offset pin  350   a  abuts the bottom end  334  of the first flange region  326 . In some examples, the print head facing portion  606  is completely received in the recess  342  and only the bottom chassis facing portion  608  extends out from the bottom end  334  of the first flange region  326 . For example, the print head facing portion  606  is press fitted in the recess  342  (defined in the first flange region  326 ) to fixedly couple the offset pin  350   a  with the print head  316 . In such an embodiment, the step  612  may abut the bottom end portion  322  of the print head  316 . The step  612  may ensure that only the bottom chassis facing portion  608  of the offset pin  350   a  extends out from the bottom end portion  322  of the print head  316 . Accordingly, the print head facing portion  606  is completely received within the print head  316 . Since the length of the print head facing portion  606  and the bottom end facing portion  608  is same throughout the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d , therefore, only the bottom end facing portion  608  of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  extend out from the print head  316 . Accordingly, the length of the portion of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  that extend out from the bottom end portion  322  of the print head  316  is also same. 
     In some examples, the scope of the disclosure is not limited to the offset pin  350   a  press fitted in the recess  342  (defined in the first flange region  326 ). In an alternative embodiment, the offset pin  350   a  may be fastened with the recess  342  (defined in the first flange region  326 ) to couple the offset pin  350   a  with the recess  342  (defined in the first flange region  326 ). In such an embodiment, the step  612  may or may not abut the bottom end  334  of the first flange region  326  depending on a length of the portion of the offset pin  350   a  that extends out from the bottom end  334  of the first flange region  326 . For example, depending on an amount of fastening of the offset pin  350   a  with the recess  342 , the length of the portion of the offset pin  350   a  (extending out from the bottom end  334  of the first flange region  326 ) is determined. The structure of the offset pin  350   a  that can be fastened with the recess  342  (defined in the first flange region  326 ) is further described in conjunction with  FIG.  7   . 
       FIG.  7    illustrates another perspective view of the offset pin  350   a , according to one or more embodiments described herein. The offset pin  350   a  (as illustrated in  FIG.  7   ) has an outer surface  702  that defines a helical screw ramp  704  in the print head facing portion  606  of the offset pin  350   a . In some examples, the helical screw ramp  704  enables the coupling of the offset pin  350   a  with the recess  342  (defined in the first flange region  326 ) based on fastening of the offset pin with the recess  342  (defined in the first flange region  326 ). Further, to enable such coupling, an inner surface of the recess  342  (defined in the first flange region  326 ) may define counter helical screw ramp (not shown). 
     In an example embodiment, a clockwise rotation of the offset pin  350   a  or anti-may cause a variation in the length of the portion of the offset pin  350   a  that extends out from bottom end  334  of the first flange region  326 . 
     In some examples, the scope of the disclosure is not limited adjusting the length of the portion of the offset pin  350   a  that extends out from the first flange region  326  based on the helical screw ramp  704 . In an example embodiment, various other mechanism can be utilized to adjust the length of the portion of the offset pin  350   a . Some examples of the various mechanisms may include, but not limited to, a push and lock mechanism (similar to retractable pen mechanism). 
     Referring back to  FIG.  3   , the print head  316  (coupled to the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d ) is configured to be received within the top chassis portion  132 . More particularly, the print head  316  (coupled to the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d ) is configured to be received within a cavity  352  defined in the top chassis portion  132 . In an example embodiment, the outer surface  204  of the top chassis portion  132  defines the cavity  352  in the top chassis portion  132  that extends from the top end portion  206  to the bottom end portion  208  along the vertical axis  136  of the print apparatus  100 . In an example embodiment, defining the cavity  352  in the top chassis portion  132  leads to defining of an inner surface  354  of the top chassis portion  132 . The structure of the top chassis portion  132  is further described in conjunction with  FIG.  8    and  FIG.  9   . 
     Referring to  FIG.  8    and  FIG.  9   , a top perspective view and a bottom perspective view of the top chassis portion  132 , respectively, are illustrated. The outer surface  204  of the top chassis portion  132  defines a first recess  902  within the first wing portion  216 , and a second recess  904  within the second wing portion  220 . In an example embodiment, the first recess  902  extends from the bottom end portion  208  of the top chassis portion  132  towards step  218 . Further, the first recess  902  defines an inner surface  906  of the first wing portion  216 . Similarly, in an example embodiment, the second recess  904  extends from the bottom end portion  208  of the top chassis portion  132  towards step  222 . Further, the second recess  904  defines an inner surface  908  of the second wing portion  220 . 
     Referring to  FIG.  8   , in an example embodiment, the outer surface  204  of the top chassis portion  132  defines a first through hole  802  and a second through hole  946  in the first wing portion  216 . Further, the first through hole  802  and the second through hole  946  are defined on the opposite sides of the top chassis portion  132  (e.g., on the side  210   a  and the side  210   c ). In some examples, the first through hole  802  and the second through hole  946  extend from the outer surface  204  of the top chassis portion  132  to the inner surface  906  of the first wing portion  216 . Furthermore, the first through hole  802  and the second through hole  946  has a common central axis  806  that aligns with the longitudinal axis  214  of the print engine assembly  130 . 
     Similarly, in an example embodiment, the outer surface  204  of the top chassis portion  132  defines a third through hole  808  and a fourth through hole  948  in the second wing portion  220 . Further, the third through hole  808  and the fourth through hole  948  are defined on the opposite sides of the top chassis portion  132  (e.g., on the side  210   a  and the side  210   c ). Furthermore, the third through hole  808  and the fourth through hole  948  extend from the outer surface  204  of the top chassis portion  132  to the inner surface  908  of the second wing portion  220 . In some examples the third through hole  808  and the fourth through hole  948  has a common central axis  812  that aligns with the longitudinal axis  214  of the print engine assembly  130 . 
     Referring back to  FIG.  9   , in an example embodiment, the first recess  902  is configured to receive a first roller  910  such that the first roller  910  is rotatably coupled with the first through hole  802  and the second through hole  946 . Further, the second recess  904  is configured to a second roller  912  such that the second roller  912  is rotatably coupled with the third through hole  808  and the fourth through hole  948 . In some examples, the first roller  910  and the second roller  912  facilitate the travel of the print media  104  along the print path. 
     Additionally, in some examples, the second recess  904  is configured to receive a media sensor  914 . In an example embodiment, the media sensor  914  may be configured to detect a position of the print media  104  with respect to the print head  316 . In some examples, the scope of the disclosure is not limited to the receiving the media sensor  914  in the second recess  904 . In an example embodiment, the media sensor  914  may be received in the first recess  902 , without departing from the scope of the disclosure. 
     Referring to  FIG.  9   , in an example embodiment, the inner surface  354  (defining the periphery of the cavity  352 ) may define a first base plate  916  at the bottom end portion  208  of the top chassis portion  132 . In some examples, the first base plate  916  extends inwardly towards a central axis  918  of the cavity  352  (that extends from the bottom end portion  208  of the top chassis portion  132  to the top end portion  206  of the top chassis portion  132 ). Further, the first base plate  916  is defined on the side  210   a  of the top chassis portion  132 . Furthermore, the first base plate  916  has an outer surface  920  and an inner surface  922 . The outer surface  920  of the first base plate  916  coincides with the outer surface  204  of the top chassis portion  132  at the bottom end portion  208  of the top chassis portion  132 . The inner surface  922  of the first base plate  916  faces the cavity  352 . In some examples, a width of the first base plate  916  along the longitudinal axis  214  of the print engine assembly  130  is substantially same a width of the first flange region  326  (defined on print head  316 ) along the longitudinal axis  214  of the print engine assembly  130 . 
     In some examples, the outer surface  920  of the first base plate  916  defines a first locator pin through hole  924 , a first offset through hole  926 , a second offset through hole  928 , and an second locator pin through hole  930 . The first locator pin through hole  924  is defined to be proximal to the side  210   a  and side  210   b , while the second locator pin through hole  930  is defined to be proximal to the side  210   a  and the side  210   d . Further, the first offset through hole  926  and the second offset through hole  928  are defined in such a manner that the first offset through hole  926  and the second offset through hole  928  align with the recess  342  and the recess  348  defined in the first flange region  326  and second flange region  328  (defined on the print head  316 ), respectively, when the print head  316  is received in the cavity  352 . In some examples, the first offset through hole  926  and the second offset through hole  928  are defined to be positioned between the first locator pin through hole  924  and the second locator pin through hole  930  (along the lateral axis  212  of the print engine assembly  130 ). 
     Similar to the first base plate  916 , in an example embodiment, the inner surface  354  may define a second base plate  932  at the bottom end portion  208  of the top chassis portion  132 . In some examples, the second base plate  932  extends inwardly towards the central axis  918  of the cavity  352 . Further, the first base plate  916  is defined on the side  210   c  of the top chassis portion  132 . In some examples, the second base plate  932  is spaced apart from the first base plate  916  along the longitudinal axis  214  of the print engine assembly  130 . A distance between the first base plate  916  and the second base plate  932  may be equal to the length of the print head  316  (excluding the width of first flange region  326  and the third flange region  340 ) along the longitudinal axis  214  of the print engine assembly  130 . 
     In an example embodiment, the structure of the second base plate  932  may be similar to the structure of the first base plate  916 . For example, an outer surface  934  of the second base plate  932  defines a third locator pin through hole  936 , a third offset through hole  938 , an fourth offset through hole  940 , and a fourth locator pin through hole  942 . The third locator pin through hole  936  is defined to be proximal to the side  210   c  and side  210   b , while the fourth locator pin through hole  942  is defined to be proximal to the side  210   c  and  210   d . Further, the third offset through hole  938  and the fourth offset through hole  940  are defined in such a manner that the third offset through hole  938  and the fourth offset through hole  940  align with the recess  504  and the recess  506  defined in the third flange region  340  and the fourth flange region  502  (defined on the print head  316 ), respectively. when the print head  316  is received in the cavity  352 . In some examples, the third offset through hole  938  and the fourth offset through hole  940  are defined to be positioned between the third locator pin through hole  936  and the fourth locator pin through hole  942  (along the lateral axis  212  of the print engine assembly  130 ). 
     In an example embodiment, the first locator pin through hole  924  (defined on the first base plate  916 ), the second locator pin through hole  930  (defined on the first base plate  916 ), the third locator pin through hole  936  (defined on the second base plate  932 ), and the fourth locator pin through hole  942  (defined on the second base plate  932 ) are configured to receive one or more locator pins  944   a ,  944   b ,  944   c , and  944   d , respectively. In an example embodiment, the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  may orthogonally extend out from the bottom end portion  208  of the top chassis portion  132 . In some examples, the one or more location pins  944   a ,  944   b ,  944   c , and  944   d  may be fixedly coupled with the first locator pin through hole  924  (defined on the first base plate  916 ), the second locator pin through hole  930  (defined on the first base plate  916 ), the third locator pin through hole  936  (defined on the second base plate  932 ), and the fourth locator pin through hole  942  (defined on the second base plate  932 ), respectively. In alternative embodiment, the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  may be removably coupled with the first locator pin through hole  924  (defined on the first base plate  916 ), the second locator pin through hole  930  (defined on the first base plate  916 ), the third locator pin through hole  936  (defined on the second base plate  932 ), and the fourth locator pin through hole  942  (defined on the second base plate  932 ), respectively. In yet another embodiment, the one or more location pins  944   a ,  944   b ,  944   c , and  944   d  may be pre-molded with the top chassis portion  132  at the bottom end portion  208  of the top chassis portion  132 . In such an embodiment, the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  may not correspond to separate components that may be assembled with the top chassis portion  132 . In some examples, the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  may ensure alignment of the top chassis portion  132  with the bottom chassis portion  134 , as is further described later in conjunction with  FIG.  3   . 
     As discussed, the top chassis portion  132  is configured to receive the print head  316  in the cavity  352 .  FIG.  10   a    and  FIG.  10   b    illustrate a bottom perspective view of the top chassis portion  132  without the print head  316 , and the top chassis portion  132  with the print head  316 , respectively, according to one or more embodiments described herein. 
     Referring to  FIG.  10   a   , the top chassis cap  202  is disposed on the top end portion  206  of the top chassis portion  132 . Further, the protrusions  402  and  404  extend from the bottom end portion  306  of the top chassis cap  202  into the cavity  352 . In some examples, the first biasing member  308  and the second biasing member  310  are coupled to the protrusions  402  and  404 , respectively such that the first biasing member  308  and the second biasing member  310  extend into the cavity  352 . 
     In an example embodiment, the first recess  902  (defined in the first wing portion  216 ) receives the first roller  910 . The second recess  904  (defined in the second wing portion  220 ) receives the second roller  912 . Additionally, the second recess  904  receives the media sensor  914 . 
     Referring to  FIG.  10   b   , the print head  316  is received within the cavity  352 . As discussed, the recesses  342 ,  348 ,  504  and  506  (defined in the first flange region  326 , the second flange region  328 , the third flange region  340 , the fourth flange region  502 , respectively) align with the first offset through hole  926 , the second offset through hole  928 , the third offset through hole  938  and the fourth offset through hole  940 , respectively, when the print head  316  is received in the top chassis portion  132 . Further, as discussed, the recesses  342 ,  348 ,  504  and  506  are configured to receive the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d , therefore, the plurality of offset pins  350   a ,  350   d ,  350   b , and  350   c  extends out from the first offset through hole  926 , the second offset through hole  928 , the third offset through hole  938  and the fourth offset through hole  940  at the bottom end portion  208  of the top chassis portion  132 . Further, referring to  FIG.  10   b   , the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  also extend out from the bottom end portion  208  of the top chassis portion  132 . 
     In some examples, after the top chassis portion  132  receives the print head  316 , the first roller  910  and the second roller  912 , the assembled top chassis portion  132  is coupled with the bottom chassis portion  134  through the latch  138 . Referring back to  FIG.  3   , the bottom chassis portion  134  has the outer surface  224  that defines the bottom end portion  228  of the bottom chassis portion  134  and the top end portion  226  of the bottom chassis portion  134 . Hereinafter, the outer surface  224  of the bottom chassis portion  134  at the top end portion  226  of the bottom chassis portion  134  is referred to as top surface  356  of the bottom chassis portion  134 . The structure of the bottom chassis portion  134  is described herein in conjunction with  FIG.  11   .  FIG.  11    illustrates a bottom perspective view of the bottom chassis portion  134 , according to one or more embodiments described herein. 
     Referring to  FIG.  3    and  FIG.  11   , hereinafter, the outer surface  224  of the bottom chassis portion  134  at the bottom end portion  228 , of the bottom chassis portion  134 , is referred to as a bottom surface  1102  of the bottom chassis portion  134 . In some examples, the top surface  356  defines a platform  358  that may correspond to a region on which the print media  104  is received for printing operation. In some examples, the platform  358  is defined between the central axis  244  (passing through the first circular notch  236  and the third circular notch  240 ) and the central axis  246  (passing through the second circular notch  238  and the fourth circular notch  242 ). Further, the platform extends between the length and width of the bottom chassis portion  134 . 
     In an example embodiment, the top surface  356  of the bottom chassis portion  134  further divides the platform  358  into a printing region  360  and a periphery region  362 . An area of the printing region  360  may be defined to be proportional to a maximum size of the print media  104  supported by the printing apparatus  100 . In some examples, the periphery region  362  surrounds the printing region  360 . 
     In an example embodiment, the top surface  356  of the bottom chassis portion  134  defines a plurality of orifices  364   a ,  364   b , . . . ,  364   n  that extends from the top surface  356  of the bottom chassis portion  134  to the bottom surface  1102  of the bottom chassis portion  134 . At the bottom surface  1102 , the bottom chassis portion  134  is configured to receive a fan  1104 . In an example embodiment, the fan  1104  may be configured to generate a negative pressure at the top surface  356  of the bottom chassis portion  134  through the plurality of orifices  364   a ,  364   b , . . . ,  364   n . In some examples, the negative pressure enables the print media  104  to be flat during the printing operation. In some examples, the bottom chassis portion  134  may be devoid of the plurality of orifices  364   a ,  364   b , . . . ,  364   n , and the fan  1104 , with departing from the scope of the disclosure. 
     In an example embodiment, the top surface  356  of the bottom chassis portion  134  further defines one or more locator features  366   a ,  366   b ,  366   c , and  366   d  proximal to each corner of the platform  358 . In some examples, the one or more locator feature  366   a ,  366   b ,  366   c , and  366   d  may correspond to a recess defines on the platform  358  that is configured to receive the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  on the top chassis portion  132 . In an example embodiment, the one or more locator features  366   a ,  366   b ,  366   c , and  366   d  and the one or more locator pins  944   a ,  944   b ,  944   c , and  944   d  facilitate alignment between the top chassis portion  132  and the bottom chassis portion  134  during coupling of the top chassis portion  132  with the bottom chassis portion  134 . 
       FIG.  12    illustrates a section view of the print engine assembly  130 , when a sectional plane  1202  passes through the print engine assembly  130 , according to one or more embodiments described herein. 
     Referring to  FIG.  12   , the print head  316  is coupled to the top chassis cap  202  through the first biasing member  308  and the second biasing member  310 . As discussed, the first biasing member  308  and the second biasing member  310  exert a downward force on the print head  316  to cause a portion  1206  of the offset pin  350   a  and a portion  1208  of the offset pin  350   c  (coupled to the first flange region  326  and the third flange region  340 ) to extend out from the bottom end portion  208  of the top chassis portion  132 . More particularly, the portion  1206  of the offset pin  350   a  and the portion  1208  the offset pin  350   c  may extend out from the first offset through hole  926  and the third offset through hole  938  (defined on the first base plate  916  and the second base plate  932 , respectively), respectively. 
     In some examples, the offset pin  350   a  and the offset pin  350   c  abut the top surface  356  of the bottom chassis portion  134 . More particularly, the first end  602  of the offset pin  350   a  and the offset pin  350   c  abuts the periphery region  362  of the platform  358  (defined on the bottom chassis portion  134 ). In some examples, as the first biasing member  308  and the second biasing member  310  exert a downward force on the print head  316 , the first end  602  of the offset pin  350   a  and offset pin  350   c  remains abutted to the periphery region  362  of the platform  358  (defined the bottom chassis portion  134 ). Accordingly, the abutting of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  with the top surface  356  of the bottom chassis portion  134  causes the bottom surface  332  of the print head  316  to be positioned at a predetermined distance (depicted by  1210 ) from the top surface  356  of the bottom chassis portion  134 . In some examples, the predetermined distance (depicted  1210 ) may be determined based on a focal length of the laser light source unit  512  (installed in the print head  316 ). In an example embodiment, the predetermined distance is determined in such that the laser light source unit  512  (installed in the print head  316 ) focusses the light from the laser light source  514  on the top surface  356  of the bottom chassis portion  134  during the printing operation. 
     Additionally, in some examples, the abutting of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  ensures that the bottom surface  332  of the print head  316  is parallel to the top surface  356  of the bottom chassis portion  134 . Accordingly, the print operation performed by such an arrangement of the print head  316  is free from scaling errors and orientation errors. 
     In an example embodiment, as discussed, the length of the portion of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  are adjustable by either rotating the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  clockwise or anti-clockwise. Accordingly, the predetermined distance between the bottom surface  332  of the print head  316  and the top surface  356  of the bottom chassis portion  134  is adjustable. Such flexibility allows calibration of the print head  316  prior to printing operation. For example, due to mechanical vibrations in the printing apparatus  100 , the predetermined distance (depicted  1210 ) between the print head  316  and the top surface  356  of the bottom chassis portion  134  gets modified. The adjustability of the length of the portion of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  extending out from the bottom end portion  208  of the top chassis portion  132  allows the print head  316  to repositioned with respect to the bottom chassis portion  134  (for example at the predetermined distance from the bottom chassis portion  134 ). 
     The positioning of the print head  316  on the top surface  356  of the bottom chassis portion  134  is further illustrated in  FIG.  13   .  FIG.  13    illustrates a perspective view of the print engine assembly  130  with the top chassis portion  132  removed, according to one or more embodiments described herein. 
     As shown, the print head  316  rests on the top surface  356  of the bottom chassis portion  134  through the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d . The plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  ensures that the predetermined distance (depicted by  1210 ) is maintained between the bottom surface  332  of the print head  316  and the top surface  356  of the bottom chassis portion  134 . Further, it can be observed that the bottom surface  332  of the print head  316  is parallel to the top surface  356  of the bottom chassis portion  134 . 
     In some examples, the scope of the disclosure is not limited to the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  being attached to the print head  316 . In an alternate embodiment, the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  maybe attached to the bottom chassis portion  134  and may be configured to abut the bottom surface  332  of the print head  316  to maintain the predetermined distance between the bottom chassis portion  134  and the print head  316 . In such an implementation, the top surface  356  of the bottom chassis portion  134  may define one or more recesses that may be configured to receive the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d . The plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may orthogonally extend out from the top surface  356  of the bottom chassis portion  134 . 
     When the top chassis portion  132  is coupled with the bottom chassis portion  134 , the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  are received though the first offset through hole  926 , the second offset through hole  928 , the third offset through hole  938  and the fourth offset through hole  940 . Further, the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may abut the bottom surface  332  of the print head causing the bottom surface  332  of the print head to be positioned at the predetermined distance from the top surface  356  of the bottom chassis portion  134 . 
     In yet another implementation, the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may be movably coupled to first base plate  916  and the second base plate  932  at the first offset through hole  926 , the second offset through hole  928 , the third offset through hole  938  and the fourth offset through hole  940 . In some examples, the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may be configured to move along the vertical axis  136  of the print engine assembly  130 . When the top chassis portion  132  is coupled with the bottom chassis portion  134 , the first end  602  of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may abut the top surface  356  of the bottom chassis portion  134 . Further, the second end  604  of the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  may abut the bottom surface  332  of the print head  316 . Accordingly, the plurality of offset pins  350   a ,  350   b ,  350   c , and  350   d  ensure maintenance of the predetermined distance between the print head  316  and the bottom chassis portion  134 . 
     In the specification and figures, typical embodiments of the disclosure have been disclosed. The present disclosure is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation. 
     The foregoing detailed description has set forth various embodiments of the devices and/or processes via the use of block diagrams, flow charts, schematics, exemplary, and examples. Insofar as such block diagrams, flow charts, schematics, and examples contain one or more functions and/or operations, each function and/or operation within such block diagrams, flowcharts, schematics, or examples can be implemented, individually and/or collectively, by a wide range of hardware thereof. 
     In one embodiment, examples of the present disclosure may be implemented via Application Specific Integrated Circuits (ASICs). However, the embodiments disclosed herein, in whole or in part, can be equivalently implemented in standard integrated circuits, as one or more computer programs running on one or more computers (e.g., as one or more programs running on one or more computer systems), as one or more programs running on one or more processing circuitries (e.g., micro-processing circuitries), as one or more programs running on one or more processors (e.g., microprocessors), as firmware, or as virtually any combination thereof. 
     In addition, those skilled in the art will appreciate that example mechanisms disclosed herein may be capable of being distributed as a program product in a variety of tangible forms, and that an illustrative embodiment applies equally regardless of the particular type of tangible instruction bearing media used to actually carry out the distribution. Examples of tangible instruction bearing media include, but are not limited to, the following: recordable type media such as floppy disks, hard disk drives, CD ROMs, digital tape, flash drives, and computer memory. 
     The various embodiments described above can be combined with one another to provide further embodiments. For example, two or more of example embodiments described above may be combined to, for example, improve the safety of laser printing and reduce the risks associated with laser-related accidents and injuries. These and other changes may be made to the present systems and methods in light of the above detailed description. Accordingly, the disclosure is not limited by the disclosure, but instead its scope is to be determined by the following claims.