Patent Description:
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.

United States Patent Application Publication No. <CIT> relates to an integrated inkjet module, which includes: a support chassis configured for fixedly mounting on a media feed chassis; a maintenance chassis mounted on the support chassis; and a print bar chassis liftably mounted on the maintenance chassis, the print bar chassis having one or more printheads mounted thereon. The print bar chassis includes datum pins maximally spaced apart at each comer thereof, with each datum pin engaging with a complementary datum surface of the support chassis to control a separation between the printheads and a media feed path during printing.

United States Patent Application Publication No. <CIT> relates to a printer containing a printhead that is detachably mounted on a support plate and is held thereon at two rigid support points located on a first side of the printhead and one elastic support point located on a second side of the printhead opposite to said first side, each of the support points being defined by a first portion on the side of the printhead and a second portion on the side of the support plate, and one of the first and second portions is a spherical surface engaged in a recess of the other of the first and second portions in a self-centering manner wherein the second part of the elastic support point has its spherical surface formed by a bead or ball fixed on a wire, said wire being elastically biased toward the recess, so that the elastic support point releasably biases the printhead towards said first side of the printhead and released by lifting the wire, for detaching the printhead.

The invention is defined in the independent claims, to which reference should now be made. Advantageous features are set out in the dependent claims. 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.

Some embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, the invention 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.

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.

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.

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.

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.

The print head is positioned at a predetermined distance from the bottom chassis portion through a plurality of offset pins. The plurality of offset pins is 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 equal 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> illustrates an example printing apparatus <NUM>, according to one or more embodiments described herein. While not shown in <FIG>, the printing apparatus <NUM> may comprise a power source, as well as a printer cover for housing various components in the interior of the printing apparatus <NUM>.

The printing apparatus <NUM> may include a media supply roll <NUM>. The media supply roll <NUM> may comprise print media <NUM> that may be wound on the media supply spool <NUM>. In the example shown in <FIG>, the printing apparatus <NUM> may comprise a media supply spindle <NUM>, and the media supply spool <NUM> may be configured to be disposed on the media supply spindle <NUM>.

In some examples, the printing apparatus <NUM> may comprise a media guiding spindle <NUM>, which may be positioned to guide the print media from the media supply roll <NUM> to travel in a print direction along a print path within the printing apparatus <NUM>. In some examples, the print path may correspond to a path between the media supply spindle <NUM> to an exit slit <NUM> 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 <NUM> from the exit slit <NUM>.

In some examples, the printing apparatus <NUM> may comprise one or more motors (not shown) for rotating the media supply spool <NUM> disposed on the media supply spindle <NUM> 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 <NUM> 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 <NUM> and/or the media guiding spindle <NUM> 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 <NUM> and/or the media guiding spindle <NUM> may be eliminated, and the print media <NUM> may be fed into the printing apparatus <NUM> through an opening slit, and may exit from the printing apparatus <NUM> through an exit slit <NUM>.

In some examples, the printing apparatus <NUM> may include a graphical user interface (GUI) <NUM> for enabling communications between a user and the printing apparatus <NUM>. The GUI <NUM> may be communicatively coupled to other components of the printing apparatus <NUM> 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>, the printing apparatus <NUM> may include the GUI <NUM> with, for example, a display <NUM> and a keypad <NUM>. The display <NUM> may be configured to display various information associated with the printing apparatus <NUM>. The keypad <NUM> 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 <NUM> may be electronically coupled to a controller for controlling operations of the printing apparatus <NUM>, in addition to other functions. The GUI <NUM> 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> illustrates an example GUI <NUM>, it is noted that the scope of the present disclosure is not limited to the example GUI <NUM> as shown in <FIG>. In some embodiments, the user interface may be different from the one depicted in <FIG>. In some embodiments, there may not be a user interface.

Referring back to <FIG>, the printing apparatus <NUM> may comprise a back-spine section <NUM>. In some examples, the back-spine section <NUM> 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 <NUM> may comprise a first surface <NUM>. The first surface <NUM> may be in a perpendicular arrangement with a surface <NUM> of a printer base <NUM>.

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>, a first linear guide 128A and a second linear guide 128B may be disposed on the first surface <NUM>. The first linear guide 128A may, for example, comprise a linear rail fastened to the first surface <NUM> of the back-spine section <NUM>, 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 128B may comprise a linear rail disposed on the first surface <NUM> of the back-spine section <NUM>, and a corresponding linear block. In an example embodiment, the first linear guide 128A and the second linear guide 128B are positioned parallel to each other and may be positioned along a vertical axis <NUM> of the printing apparatus <NUM>.

In some examples, a print engine assembly <NUM> of the printing apparatus <NUM> may be coupled to the first linear guide 128A and the second linear guide 128B through the corresponding linear block of the first linear guide 128A and second linear guide 128B, respectively. The print engine assembly <NUM> comprises a top chassis portion <NUM> and a bottom chassis portion <NUM>. In some examples, the top chassis portion <NUM> of the print engine assembly <NUM> may be coupled to the first linear guide 128A and the second linear guide 128B through the corresponding linear block of the first linear guide 128A and second linear guide 128B, respectively. Further, in some examples, as the top chassis portion <NUM> may move along the linear rail(s) of first linear guide 128A and/or the second linear guide 128B along the vertical axis <NUM> of the printing apparatus <NUM>.

In some examples, the bottom chassis portion <NUM> may be fastened to the first surface <NUM> of the back-spine section <NUM>. In some examples, the bottom chassis portion <NUM> may be positioned under the top chassis portion <NUM> in the vertical axis <NUM> and may be configured to receive the print media from the media supply roll <NUM>.

In some examples, as the top chassis portion <NUM> may move along the vertical axis <NUM> along its corresponding travel path, the top chassis portion <NUM> may reach and/or be positioned at a bottom point of the travel path in the vertical axis <NUM>. When the top chassis portion <NUM> is positioned at the bottom point, the top chassis portion <NUM> may be removably coupled to the bottom chassis portion <NUM> through a latch <NUM>.

The structure of the print engine assembly <NUM> is further described in conjunction with <FIG> and <FIG>.

<FIG> illustrates a perspective view of the print engine assembly <NUM>, according to one or more embodiments described herein. The print engine assembly <NUM> includes the top chassis portion <NUM>, the bottom chassis portion <NUM>, and a top chassis cap <NUM>.

In an example embodiment, the top chassis portion <NUM> has an outer surface <NUM> that may define a top end portion <NUM> and a bottom end portion <NUM>, which does not include the top chassis cap <NUM>. The top end portion <NUM> and the bottom end portion <NUM>, of the top chassis portion <NUM>, are spaced apart from each other along the vertical axis <NUM> of the printing apparatus <NUM>. Further, in some examples, the bottom end portion <NUM> may be defined to be proximal to the bottom chassis portion <NUM>, while the top end portion <NUM> may be defined to be distal from the bottom chassis portion <NUM>, when the top chassis portion <NUM> is coupled to the bottom chassis portion <NUM>.

In some examples, the top chassis portion <NUM> may have a rectangular shape with one or more sides 210a, 210b, 210c, and 210d. The side 210a and the side 210c may be defined to be opposite to each other along a longitudinal axis <NUM> of the print engine assembly <NUM>. Similarly, the side 210b and the side 210d may be defined to be opposite to each other along a lateral axis <NUM> of the print engine assembly <NUM>. In some examples, the scope of the disclosure is not limited to the top chassis portion <NUM> having a rectangular shape. In an example embodiment, the shape of the top chassis portion <NUM> may correspond to other polygons, without departing from the scope of the disclosure.

In an example embodiment, the outer surface <NUM> of the top chassis portion <NUM> defines a first wing portion <NUM> that protrudes out from the side 210b of the top chassis portion <NUM> along the lateral axis <NUM> of the print engine assembly <NUM>. Additionally, the first wing portion <NUM> extends from the side 210a to the side 210c along the longitudinal axis <NUM> of the print engine assembly <NUM>. In some examples, a length of the first wing portion <NUM> (along the longitudinal axis <NUM>) may be same as a length of the top chassis portion <NUM> (along the longitudinal axis <NUM>) may be same as a length of the top chassis portion <NUM> (along the longitudinal axis <NUM>). Further, a height of the first wing portion <NUM> is less than a height of the top chassis portion <NUM>. Accordingly, along the vertical axis <NUM> of the printing apparatus <NUM>, the first wing portion <NUM> may define a step <NUM> with the side 210b.

In an example embodiment, similar to the first wing portion <NUM>, the outer surface <NUM> of the top chassis portion <NUM> defines a second wing portion <NUM> that protrudes out from the side 210d of the top chassis portion <NUM> along the lateral axis <NUM> of the print engine assembly <NUM>. Additionally, the second wing portion <NUM> extends from the side 210a to the side 210c along the longitudinal axis <NUM> of the print engine assembly <NUM>. In some examples, a length of the second wing portion <NUM> (along the longitudinal axis <NUM>) may be same as the length of the top chassis portion <NUM> (along the longitudinal axis <NUM>). Further, a height of the second wing portion <NUM> is less than the height of the top chassis portion <NUM>. Accordingly, along the vertical axis <NUM> of the printing apparatus <NUM>, the second wing portion <NUM> may define a step <NUM> with the side 210d.

In an example embodiment, the side 210a is further configured to receive the latch <NUM> that facilitates removable coupling of the top chassis portion <NUM> with the bottom chassis portion <NUM>.

In an example embodiment, as discussed above, the bottom chassis portion <NUM> is fixed to the first surface <NUM> of the back-spine section <NUM> (refer <FIG>). Additionally, the bottom chassis portion <NUM> has an outer surface <NUM>. In some examples, the outer surface <NUM> of the bottom chassis portion <NUM> defines a top end portion <NUM> of the bottom chassis portion <NUM>, and a bottom end portion <NUM> of the bottom chassis portion <NUM>. The bottom end portion <NUM> of the bottom chassis portion <NUM> is spaced apart from the top end portion <NUM> of the bottom chassis portion <NUM> along the vertical axis <NUM> of the print engine assembly <NUM>. Further, the top end portion <NUM> of the bottom chassis portion <NUM> is proximal to the bottom end portion <NUM> of the top chassis portion <NUM>, while the bottom end portion <NUM> of the bottom chassis portion <NUM> is distal from the bottom end portion <NUM> of the top chassis portion <NUM>.

In an example embodiment, the outer surface <NUM> of the bottom chassis portion <NUM> defines at least two sides 230a and 230b of the bottom chassis portion <NUM>. In an example embodiment, the side 230a may be spaced apart from the side 230b along the longitudinal axis <NUM> of the print engine assembly <NUM>. In an example embodiment, the sides 230a has a first edge <NUM> and a second edge <NUM>. In some examples, the first edge <NUM> is spaced apart from the second edge <NUM> along the lateral axis <NUM> of the print engine assembly <NUM>. Similar to the side 230a, the side 230b has a third edge <NUM> and a fourth edge <NUM> (Refer <FIG>). In some examples, the third edge <NUM> is spaced apart from the fourth edge <NUM> (refer <FIG>) along the lateral axis <NUM> of the print engine assembly <NUM>.

In an example embodiment, the outer surface <NUM> of the bottom chassis portion <NUM> may define a first circular notch <NUM> and a second circular notch <NUM> on the side 230a. Further, the first circular notch <NUM> and the second circular notch <NUM> are defined (by the outer surface <NUM> of the bottom chassis portion <NUM>) at the top end portion <NUM> of the bottom chassis portion <NUM>. Furthermore, the outer surface <NUM> of the bottom chassis portion <NUM> defines the first circular notch <NUM> proximal to the first edge <NUM> of the side 230a, and the second circular notch <NUM> proximal to the second edge <NUM> of the side 230a. Similarly, the outer surface <NUM> of the bottom chassis portion <NUM> may define a third circular notch <NUM> (refer <FIG>) and a fourth circular notch <NUM> (refer <FIG>) on the side 230b at the top end portion <NUM> of the bottom chassis portion <NUM>. Further, the outer surface <NUM> defines the third circular notch <NUM> proximal to the third edge <NUM> of the side 230b, and the fourth circular notch <NUM> proximal to the fourth edge <NUM> of the side 230b. In some examples, the first circular notch <NUM> and the third circular notch <NUM> may have a coinciding central axis <NUM> (refer <FIG>) extending along the longitudinal axis <NUM> of the print engine assembly <NUM>. Similarly, the second circular notch <NUM> and the fourth circular notch <NUM> may have a coinciding central axis <NUM> (refer <FIG>) extending along the longitudinal axis <NUM> of the print engine assembly <NUM>.

In an example embodiment, the first circular notch <NUM> and the third circular notch <NUM> are configured to receive a first shaft <NUM> such that the first shaft <NUM> is rotatable in the first circular notch <NUM> and the third circular notch <NUM>. Additionally, the third circular notch <NUM> and the fourth circular notch <NUM> are configured to receive a second shaft <NUM> such that the second shaft <NUM> is rotatable in the second circular notch <NUM> and the fourth circular notch <NUM>. In some examples, the first shaft <NUM> and the second shaft <NUM> may correspond to rollers that may assist the travel of the print media <NUM> along the print path.

<FIG> illustrates an exploded view of the print engine assembly <NUM>, according to one or more embodiments described herein.

In an example embodiment, the top chassis cap <NUM> has an outer surface <NUM> that may define a top end portion <NUM> of the top chassis cap <NUM> and a bottom end portion <NUM> of the top chassis cap <NUM>. In some examples, the bottom end portion <NUM> of the top chassis cap <NUM> may abut the top end portion <NUM> of the top chassis portion <NUM> when the top chassis cap <NUM> is received on the top chassis portion <NUM>. The structure of the bottom end portion <NUM> of the top chassis cap <NUM> is further described in conjunction with <FIG>.

Referring to <FIG>, a bottom perspective view of the top chassis cap <NUM> is illustrated, according to one or more embodiments described herein. The bottom end portion <NUM> of the top chassis cap <NUM> may define one or more protrusions <NUM> and <NUM> that may orthogonally extend out from the bottom end portion <NUM> of the top chassis cap <NUM>. In some examples, the one or more protrusions <NUM> and <NUM> may be spaced apart along the longitudinal axis <NUM> of the print engine assembly <NUM>. The one or more protrusions <NUM> and <NUM> may be configured to receive at least one biasing member. For example, the one or more protrusions <NUM> and <NUM> are configured to receive a first biasing member <NUM> and a second biasing member <NUM>, respectively. In some examples, each of the first biasing member <NUM> and the second biasing member <NUM> has a first end <NUM> and a second end <NUM>. The first end <NUM> of the first biasing member <NUM> is configured to be coupled to the protrusion <NUM>. Further, the first end <NUM> of the second biasing member <NUM> is configured to be coupled to the protrusion <NUM>. In some examples, the second end <NUM> of the first biasing member <NUM> and the second end <NUM> of the second biasing member <NUM> are configured to be coupled to a print head <NUM>. The structure of the print head <NUM> is herein described in conjunction with <FIG> and <FIG>.

<FIG> illustrates a bottom perspective view of the print head <NUM>, according to one or more embodiments described herein. Referring to <FIG> and <FIG>, in an example embodiment, the print head <NUM> has an outer surface <NUM> that defines a top end portion <NUM> and a bottom end portion <NUM>, of the print head <NUM>. In some examples, the top end portion <NUM> of the print head <NUM> is configured to be coupled to the second end <NUM> of the first biasing member <NUM> and the second end <NUM> of the second biasing member <NUM>. Accordingly, the print head <NUM> is configured to be coupled to the top chassis cap <NUM> through the first biasing member <NUM> and the second biasing member <NUM>. In some examples, the scope of the disclosure is not limited to two biasing members being coupled to the print head <NUM>. In an example embodiment, a single biasing member or more than two biasing members may be coupled to the print head <NUM>, without departing from the scope of the disclosure.

Hereinafter, the outer surface <NUM> of the print head <NUM> at the top end portion <NUM> of the print head <NUM> is referred as a top surface <NUM> of the print head <NUM>. Further, hereinafter, the outer surface <NUM> of the print head <NUM> at the bottom end portion <NUM> of the print head <NUM> is referred as a bottom surface <NUM> of the print head <NUM>.

Referring to <FIG>, in an example embodiment, the bottom surface <NUM> defines one or more laser recesses <NUM>. Each of the one or more laser recesses <NUM> is configured to receive a laser light source unit <NUM>. In some examples, the laser light source unit <NUM> includes a laser light source <NUM> and an optical assembly <NUM>. The optical assembly <NUM> is configured to focus the light from the laser light source <NUM> on the bottom chassis portion <NUM> to print content on the print media <NUM>.

In an example embodiment, the print head <NUM> has substantially rectangular shape with one or more sides 324a, 324b, 324c, and 324d. In some examples, the scope of the disclosure is not limited to the print head <NUM> having the rectangular shape. In an example embodiment, the print head <NUM> may have any other shape, without departing from the scope of the disclosure. In some examples, the sides 324a and 324c of the print head <NUM> are spaced apart from each other along the longitudinal axis <NUM> of the print engine assembly <NUM>. Further, the sides 324b and 324d of the print head <NUM> are spaced apart from each other along the lateral axis <NUM> of the print engine assembly <NUM>.

In an example embodiment, the outer surface <NUM> of the print head <NUM> further defines a first flange region <NUM> and a second flange region <NUM> on the side 324a such that the first flange region <NUM> and the second flange region <NUM> extend out from the side 324a along the longitudinal axis <NUM> of the print engine assembly <NUM>. Further, the first flange region <NUM> is spaced apart from the second flange region <NUM> along the lateral axis <NUM> of the print engine assembly <NUM> such that a distance between the first flange region <NUM> and the second flange region <NUM> is less than a width of the print head <NUM> (along the lateral axis <NUM> of the print engine assembly <NUM>). In some examples, the first flange region <NUM> comprises a bottom end <NUM> and a top end <NUM>. The bottom end <NUM> of the first flange region <NUM> coincides with the bottom end portion <NUM> of the print head <NUM>. Further, the top end <NUM> of the first flange region <NUM> is defined to be distal from the bottom end portion <NUM> of the print head <NUM>. In some examples, a width of the first flange region <NUM> along the vertical axis <NUM> of the printing apparatus <NUM> is less than a height of the print head <NUM> (along the vertical axis <NUM> of the printing apparatus <NUM>). Accordingly, the first flange region <NUM> defines a step <NUM> with the side 324a of the print head <NUM>. Additionally, the outer surface <NUM> of the print head <NUM> defines a recess <NUM> in the first flange region <NUM> such that the recess <NUM> extends from the bottom end <NUM> of the first flange region <NUM> towards the top end <NUM> of the first flange region <NUM>. In some examples, the recess <NUM> extends along the vertical axis <NUM> of the printing apparatus <NUM>.

In an example embodiment, the structure of the second flange region <NUM> is similar to the first flange region <NUM>. For example, the second flange region <NUM> has a bottom end <NUM>, a top end <NUM>, and a recess <NUM> (that extends from the bottom end <NUM> of the second flange region <NUM> towards the top end <NUM> of the second flange region <NUM>).

Similar to the first flange region <NUM> and the second flange region <NUM>, the outer surface <NUM> of the print head <NUM> defines a third flange region <NUM> and a fourth flange region <NUM> (refer <FIG>) on the side 324c. In some examples, the third flange region <NUM> and the fourth flange region <NUM> have structure same as the structure of the first flange region <NUM>. For example, the width of each of the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> (along the vertical axis <NUM> of the printing apparatus <NUM> is same. Further, similar to the first flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> has a recess <NUM> and <NUM> (refer <FIG>), respectively. It may be appreciated that the defining the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> may have different widths and/or different size without departing from the scope of the disclosure.

In an example embodiment, the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> are configured to receive a plurality of offset pins. For example, the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region (not visible) are configured to receive the plurality of offset pins 350a, 350d, 350b, and 350c, respectively. In some examples, a structure of the each offset pin of the plurality of offset pins 350a, 350b, 350c, and 350d is same and is further described in conjunction with <FIG>.

In some examples, the scope of the disclosure is not limited to the outer surface <NUM> of the print head <NUM> defining the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> on the sides 324a and 324c. In an example embodiment, the outer surface <NUM> of the print head <NUM> may define the first flange region <NUM>, and the second flange region <NUM> on the side 324b of the print head <NUM>. To this end, the outer surface <NUM> may define the third flange region <NUM> and the fourth flange region <NUM> on the side 324d. In some examples, the outer surface <NUM> 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 <NUM> may define the first flange region <NUM> and the fourth flange region <NUM>. In yet another embodiment, the outer surface <NUM> may define the second flange region <NUM>, and the third flange region <NUM>. In some examples, the scope of the disclosure is not limited to the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM>, defined at a plurality of corners of the print head <NUM>. In an example embodiment, the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> may be defined at a middle of each side 324a, 324b, 324c, and 324d of the print head <NUM>, 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 <NUM> having four flanges. In an example embodiment, the print head <NUM> may have more than four flanges.

In some examples, the print head <NUM> may not include any flange region. In such an implementation, the plurality of offset pins 350a, 350b, 350c, and 350d is received at the bottom end portion <NUM> of the print head <NUM>. For example, the bottom end portion <NUM> of the print head <NUM> may receive the plurality of offset pins 350a, 350b, 350c, and 350d at the plurality of corners. In an example embodiment, the plurality of corners of the print head <NUM> may defined at regions where two or more sides of the print head <NUM> meet. In such an implementation, the outer surface <NUM> may define the recesses <NUM>, <NUM>, <NUM> and <NUM> at the plurality of corners of the print head <NUM>, where the plurality of offset pins 350a, 350b, 350c, and 350d may be received within recesses <NUM>, <NUM>, <NUM> and <NUM> (defined at the plurality of corners of the print head <NUM>).

In some examples, not according to the invention, the plurality of offset pins 350a, 350b, 350c, and 350d does not consist of separate components. In a corresponding embodiment, bottom surface <NUM> of the print head <NUM> define one or more protrusions in each of the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM> such that the one or more protrusions may extend out orthogonally from the bottom end portion <NUM> of the print head <NUM>. In the corresponding embodiment, the one or more protrusions correspond to the plurality of offset pins 350a, 350b, 350c, and 350d. In scenarios, where the outer surface <NUM> of the print head <NUM> does not define the defining the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM> and the fourth flange region <NUM>, the bottom surface <NUM> of the print head <NUM> may define the one or more protrusions at the plurality of corners of the print head <NUM>. In some examples, the scope of the disclosure is not limited to defining the one or more protrusions (as the plurality of offset pins 350a, 350b, 350c, and 350d) at the plurality of corners of the print head <NUM>. In an example embodiment, the bottom surface <NUM> of the print head <NUM> may define the one or more protrusions (as the plurality of offset pins 350a, 350b, 350c, and 350d) at any other position other than the plurality of corners of the print head <NUM>. For example, the bottom surface <NUM> of the print head <NUM> may define the one or more protrusions (as the plurality of offset pins 350a, 350b, 350c, and 350d) at the bottom end portion <NUM> such that the one or more protrusions are defined at the middle of each of the one or more sides each side 324a, 324b, 324c, and 324d of the print head <NUM>.

<FIG> illustrates a perspective view of the offset pin 350a, according to one or more embodiments described herein. In an example embodiment, the offset pin 350a has a cylindrical shape and comprises a first end <NUM>, a second end <NUM>, a print head facing portion <NUM>, and a bottom chassis facing portion <NUM>. In some examples, the first end <NUM> is spaced apart from the second end <NUM> along the vertical axis <NUM> of the print engine assembly <NUM>. Further, in some examples, the first end <NUM> of the offset pin 350a and the second end <NUM> of the offset pin 350a, may have a hemi-spherical shape. In some examples, the scope of the disclosure is not limited to the first end <NUM> and the second end <NUM> having the hemispherical shape. In an example embodiment, the first end <NUM> and the second end <NUM>, of the offset pin 350a, may have any other shape, without departing from the scope of the disclosure. For example, the first end <NUM> and the second end <NUM> of the offset pin 350a are pointed. In yet another example, the first end <NUM> and the second end <NUM> of the offset pin 350a may have a conical shape, without departing from the scope of the disclosure.

In an example embodiment, the bottom chassis facing portion <NUM> extends from the first end <NUM> to a junction <NUM> between the bottom chassis facing portion <NUM> and the print head facing portion <NUM>. The print head facing portion <NUM> extends from the junction <NUM> (between the print head facing portion <NUM> and the bottom chassis facing portion <NUM>) and the second end <NUM>. In an example embodiment, a diameter of the print head facing portion <NUM> is less than a diameter of the bottom chassis facing portion <NUM>. Accordingly, a step <NUM> is defined at the junction <NUM> between the print head facing portion <NUM> and the bottom chassis facing portion <NUM>.

As discussed, the offset pin 350a is configured to be received in the recess <NUM> defined in the first flange region <NUM>. In some examples, the print head facing portion <NUM> of the offset pin 350a is configured to be received within the recess <NUM> of the first flange region <NUM> such that the step <NUM> on the offset pin 350a abuts the bottom end <NUM> of the first flange region <NUM>. In some examples, the print head facing portion <NUM> is completely received in the recess <NUM> and only the bottom chassis facing portion <NUM> extends out from the bottom end <NUM> of the first flange region <NUM>. For example, the print head facing portion <NUM> is press fitted in the recess <NUM> (defined in the first flange region <NUM>) to fixedly couple the offset pin 350a with the print head <NUM>. In such an embodiment, the step <NUM> may abut the bottom end portion <NUM> of the print head <NUM>. The step <NUM> may ensure that only the bottom chassis facing portion <NUM> of the offset pin 350a extends out from the bottom end portion <NUM> of the print head <NUM>. Accordingly, the print head facing portion <NUM> is completely received within the print head <NUM>. Since the length of the print head facing portion <NUM> and the bottom end facing portion <NUM> is same throughout the plurality of offset pins 350a, 350b, 350c, and 350d, therefore, only the bottom end facing portion <NUM> of the plurality of offset pins 350a, 350b, 350c, and 350d extend out from the print head <NUM>. Accordingly, the length of the portion of the plurality of offset pins 350a, 350b, 350c, and 350d that extend out from the bottom end portion <NUM> of the print head <NUM> is also same.

In some examples, the scope of the disclosure is not limited to the offset pin 350a press fitted in the recess <NUM> (defined in the first flange region <NUM>). In an alternative embodiment, the offset pin 350a may be fastened with the recess <NUM> (defined in the first flange region <NUM>) to couple the offset pin 350a with the recess <NUM> (defined in the first flange region <NUM>). In such an embodiment, the step <NUM> may or may not abut the bottom end <NUM> of the first flange region <NUM> depending on a length of the portion of the offset pin 350a that extends out from the bottom end <NUM> of the first flange region <NUM>. For example, depending on an amount of fastening of the offset pin 350a with the recess <NUM>, the length of the portion of the offset pin 350a (extending out from the bottom end <NUM> of the first flange region <NUM>) is determined. The structure of the offset pin 350a that can be fastened with the recess <NUM> (defined in the first flange region <NUM>) is further described in conjunction with <FIG>.

<FIG> illustrates another perspective view of the offset pin 350a, according to one or more embodiments described herein. The offset pin 350a (as illustrated in <FIG>) has an outer surface <NUM> that defines a helical screw ramp <NUM> in the print head facing portion <NUM> of the offset pin 350a. In some examples, the helical screw ramp <NUM> enables the coupling of the offset pin 350a with the recess <NUM> (defined in the first flange region <NUM>) based on fastening of the offset pin with the recess <NUM> (defined in the first flange region <NUM>). Further, to enable such coupling, an inner surface of the recess <NUM> (defined in the first flange region <NUM>) may define counter helical screw ramp (not shown).

In an example embodiment, a clockwise rotation of the offset pin 350a or anti-may cause a variation in the length of the portion of the offset pin 350a that extends out from bottom end <NUM> of the first flange region <NUM>.

In some examples, the scope of the disclosure is not limited adjusting the length of the portion of the offset pin 350a that extends out from the first flange region <NUM> based on the helical screw ramp <NUM>. In an example embodiment, various other mechanism can be utilized to adjust the length of the portion of the offset pin 350a. 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>, the print head <NUM> (coupled to the plurality of offset pins 350a, 350b, 350c, and 350d) is configured to be received within the top chassis portion <NUM>. More particularly, the print head <NUM> (coupled to the plurality of offset pins 350a, 350b, 350c, and 350d) is configured to be received within a cavity <NUM> defined in the top chassis portion <NUM>. In an example embodiment, the outer surface <NUM> of the top chassis portion <NUM> defines the cavity <NUM> in the top chassis portion <NUM> that extends from the top end portion <NUM> to the bottom end portion <NUM> along the vertical axis <NUM> of the print apparatus <NUM>. In an example embodiment, defining the cavity <NUM> in the top chassis portion <NUM> leads to defining of an inner surface <NUM> of the top chassis portion <NUM>. The structure of the top chassis portion <NUM> is further described in conjunction with <FIG>.

Referring to <FIG>, a top perspective view and a bottom perspective view of the top chassis portion <NUM>, respectively, are illustrated. The outer surface <NUM> of the top chassis portion <NUM> defines a first recess <NUM> within the first wing portion <NUM>, and a second recess <NUM> within the second wing portion <NUM>. In an example embodiment, the first recess <NUM> extends from the bottom end portion <NUM> of the top chassis portion <NUM> towards step <NUM>. Further, the first recess <NUM> defines an inner surface <NUM> of the first wing portion <NUM>. Similarly, in an example embodiment, the second recess <NUM> extends from the bottom end portion <NUM> of the top chassis portion <NUM> towards step <NUM>. Further, the second recess <NUM> defines an inner surface <NUM> of the second wing portion <NUM>.

Referring to <FIG>, in an example embodiment, the outer surface <NUM> of the top chassis portion <NUM> defines a first through hole <NUM> and a second through hole <NUM> in the first wing portion <NUM>. Further, the first through hole <NUM> and the second through hole <NUM> are defined on the opposite sides of the top chassis portion <NUM> (e.g., on the side 210a and the side 210c). In some examples, the first through hole <NUM> and the second through hole <NUM> extend from the outer surface <NUM> of the top chassis portion <NUM> to the inner surface <NUM> of the first wing portion <NUM>. Furthermore, the first through hole <NUM> and the second through hole <NUM> has a common central axis <NUM> that aligns with the longitudinal axis <NUM> of the print engine assembly <NUM>.

Similarly, in an example embodiment, the outer surface <NUM> of the top chassis portion <NUM> defines a third through hole <NUM> and a fourth through hole <NUM> in the second wing portion <NUM>. Further, the third through hole <NUM> and the fourth through hole <NUM> are defined on the opposite sides of the top chassis portion <NUM> (e.g., on the side 210a and the side 210c). Furthermore, the third through hole <NUM> and the fourth through hole <NUM> extend from the outer surface <NUM> of the top chassis portion <NUM> to the inner surface <NUM> of the second wing portion <NUM>. In some examples the third through hole <NUM> and the fourth through hole <NUM> has a common central axis <NUM> that aligns with the longitudinal axis <NUM> of the print engine assembly <NUM>.

Referring back to <FIG>, in an example embodiment, the first recess <NUM> is configured to receive a first roller <NUM> such that the first roller <NUM> is rotatably coupled with the first through hole <NUM> and the second through hole <NUM>. Further, the second recess <NUM> is configured to a second roller <NUM> such that the second roller <NUM> is rotatably coupled with the third through hole <NUM> and the fourth through hole <NUM>. In some examples, the first roller <NUM> and the second roller <NUM> facilitate the travel of the print media <NUM> along the print path.

Additionally, in some examples, the second recess <NUM> is configured to receive a media sensor <NUM>. In an example embodiment, the media sensor <NUM> may be configured to detect a position of the print media <NUM> with respect to the print head <NUM>. In some examples, the scope of the disclosure is not limited to the receiving the media sensor <NUM> in the second recess <NUM>. In an example embodiment, the media sensor <NUM> may be received in the first recess <NUM>, without departing from the scope of the disclosure.

Referring to <FIG>, in an example embodiment, the inner surface <NUM> (defining the periphery of the cavity <NUM>) may define a first base plate <NUM> at the bottom end portion <NUM> of the top chassis portion <NUM>. In some examples, the first base plate <NUM> extends inwardly towards a central axis <NUM> of the cavity <NUM> (that extends from the bottom end portion <NUM> of the top chassis portion <NUM> to the top end portion <NUM> of the top chassis portion <NUM>). Further, the first base plate <NUM> is defined on the side 210a of the top chassis portion <NUM>. Furthermore, the first base plate <NUM> has an outer surface <NUM> and an inner surface <NUM>. The outer surface <NUM> of the first base plate <NUM> coincides with the outer surface <NUM> of the top chassis portion <NUM> at the bottom end portion <NUM> of the top chassis portion <NUM>. The inner surface <NUM> of the first base plate <NUM> faces the cavity <NUM>. In some examples, a width of the first base plate <NUM> along the longitudinal axis <NUM> of the print engine assembly <NUM> is substantially same a width of the first flange region <NUM> (defined on print head <NUM>) along the longitudinal axis <NUM> of the print engine assembly <NUM>.

In some examples, the outer surface <NUM> of the first base plate <NUM> defines a first locator pin through hole <NUM>, a first offset through hole <NUM>, a second offset through hole <NUM>, and an second locator pin through hole <NUM>. The first locator pin through hole <NUM> is defined to be proximal to the side 210a and side 210b, while the second locator pin through hole <NUM> is defined to be proximal to the side 210a and the side 210d. Further, the first offset through hole <NUM> and the second offset through hole <NUM> are defined in such a manner that the first offset through hole <NUM> and the second offset through hole <NUM> align with the recess <NUM> and the recess <NUM> defined in the first flange region <NUM> and second flange region <NUM> (defined on the print head <NUM>), respectively, when the print head <NUM> is received in the cavity <NUM>. In some examples, the first offset through hole <NUM> and the second offset through hole <NUM> are defined to be positioned between the first locator pin through hole <NUM> and the second locator pin through hole <NUM> (along the lateral axis <NUM> of the print engine assembly <NUM>).

Similar to the first base plate <NUM>, in an example embodiment, the inner surface <NUM> may define a second base plate <NUM> at the bottom end portion <NUM> of the top chassis portion <NUM>. In some examples, the second base plate <NUM> extends inwardly towards the central axis <NUM> of the cavity <NUM>. Further, the first base plate <NUM> is defined on the side 210c of the top chassis portion <NUM>. In some examples, the second base plate <NUM> is spaced apart from the first base plate <NUM> along the longitudinal axis <NUM> of the print engine assembly <NUM>. A distance between the first base plate <NUM> and the second base plate <NUM> may be equal to the length of the print head <NUM> (excluding the width of first flange region <NUM> and the third flange region <NUM>) along the longitudinal axis <NUM> of the print engine assembly <NUM>.

In an example embodiment, the structure of the second base plate <NUM> may be similar to the structure of the first base plate <NUM>. For example, an outer surface <NUM> of the second base plate <NUM> defines a third locator pin through hole <NUM>, a third offset through hole <NUM>, an fourth offset through hole <NUM>, and a fourth locator pin through hole <NUM>. The third locator pin through hole <NUM> is defined to be proximal to the side 210c and side 210b, while the fourth locator pin through hole <NUM> is defined to be proximal to the side 210c and 210d. Further, the third offset through hole <NUM> and the fourth offset through hole <NUM> are defined in such a manner that the third offset through hole <NUM> and the fourth offset through hole <NUM> align with the recess <NUM> and the recess <NUM> defined in the third flange region <NUM> and the fourth flange region <NUM> (defined on the print head <NUM>), respectively. when the print head <NUM> is received in the cavity <NUM>. In some examples, the third offset through hole <NUM> and the fourth offset through hole <NUM> are defined to be positioned between the third locator pin through hole <NUM> and the fourth locator pin through hole <NUM> (along the lateral axis <NUM> of the print engine assembly <NUM>).

In an example embodiment, the first locator pin through hole <NUM> (defined on the first base plate <NUM>), the second locator pin through hole <NUM> (defined on the first base plate <NUM>), the third locator pin through hole <NUM> (defined on the second base plate <NUM>), and the fourth locator pin through hole <NUM> (defined on the second base plate <NUM>) are configured to receive one or more locator pins 944a, 944b, 944c, and 944d, respectively. In an example embodiment, the one or more locator pins 944a, 944b, 944c, and 944d may orthogonally extend out from the bottom end portion <NUM> of the top chassis portion <NUM>. In some examples, the one or more location pins 944a, 944b, 944c, and 944d may be fixedly coupled with the first locator pin through hole <NUM> (defined on the first base plate <NUM>), the second locator pin through hole <NUM> (defined on the first base plate <NUM>), the third locator pin through hole <NUM> (defined on the second base plate <NUM>), and the fourth locator pin through hole <NUM> (defined on the second base plate <NUM>), respectively. In alternative embodiment, the one or more locator pins 944a, 944b, 944c, and 944d may be removably coupled with the first locator pin through hole <NUM> (defined on the first base plate <NUM>), the second locator pin through hole <NUM> (defined on the first base plate <NUM>), the third locator pin through hole <NUM> (defined on the second base plate <NUM>), and the fourth locator pin through hole <NUM> (defined on the second base plate <NUM>), respectively. In yet another embodiment, the one or more location pins 944a, 944b, 944c, and 944d may be pre-molded with the top chassis portion <NUM> at the bottom end portion <NUM> of the top chassis portion <NUM>. In such an embodiment, the one or more locator pins 944a, 944b, 944c, and 944d may not correspond to separate components that may be assembled with the top chassis portion <NUM>. In some examples, the one or more locator pins 944a, 944b, 944c, and 944d may ensure alignment of the top chassis portion <NUM> with the bottom chassis portion <NUM>, as is further described later in conjunction with <FIG>.

As discussed, the top chassis portion <NUM> is configured to receive the print head <NUM> in the cavity <NUM>. <FIG> illustrate a bottom perspective view of the top chassis portion <NUM> without the print head <NUM>, and the top chassis portion <NUM> with the print head <NUM>, respectively, according to one or more embodiments described herein.

Referring to <FIG>, the top chassis cap <NUM> is disposed on the top end portion <NUM> of the top chassis portion <NUM>. Further, the protrusions <NUM> and <NUM> extend from the bottom end portion <NUM> of the top chassis cap <NUM> into the cavity <NUM>. In some examples, the first biasing member <NUM> and the second biasing member <NUM> are coupled to the protrusions <NUM> and <NUM>, respectively such that the first biasing member <NUM> and the second biasing member <NUM> extend into the cavity <NUM>.

In an example embodiment, the first recess <NUM> (defined in the first wing portion <NUM>) receives the first roller <NUM>. The second recess <NUM> (defined in the second wing portion <NUM>) receives the second roller <NUM>. Additionally, the second recess <NUM> receives the media sensor <NUM>.

Referring to <FIG>, the print head <NUM> is received within the cavity <NUM>. As discussed, the recesses <NUM>, <NUM>, <NUM> and <NUM> (defined in the first flange region <NUM>, the second flange region <NUM>, the third flange region <NUM>, the fourth flange region <NUM>, respectively) align with the first offset through hole <NUM>, the second offset through hole <NUM>, the third offset through hole <NUM> and the fourth offset through hole <NUM>, respectively, when the print head <NUM> is received in the top chassis portion <NUM>. Further, as discussed, the recesses <NUM>, <NUM>, <NUM> and <NUM> are configured to receive the plurality of offset pins 350a, 350b, 350c, and 350d, therefore, the plurality of offset pins 350a, 350d, 350b, and 350c extends out from the first offset through hole <NUM>, the second offset through hole <NUM>, the third offset through hole <NUM> and the fourth offset through hole <NUM> at the bottom end portion <NUM> of the top chassis portion <NUM>. Further, referring to <FIG>, the one or more locator pins 944a, 944b, 944c, and 944d also extend out from the bottom end portion <NUM> of the top chassis portion <NUM>.

In some examples, after the top chassis portion <NUM> receives the print head <NUM>, the first roller <NUM> and the second roller <NUM>, the assembled top chassis portion <NUM> is coupled with the bottom chassis portion <NUM> through the latch <NUM>. Referring back to <FIG>, the bottom chassis portion <NUM> has the outer surface <NUM> that defines the bottom end portion <NUM> of the bottom chassis portion <NUM> and the top end portion <NUM> of the bottom chassis portion <NUM>. Hereinafter, the outer surface <NUM> of the bottom chassis portion <NUM> at the top end portion <NUM> of the bottom chassis portion <NUM> is referred to as top surface <NUM> of the bottom chassis portion <NUM>. The structure of the bottom chassis portion <NUM> is described herein in conjunction with <FIG> illustrates a bottom perspective view of the bottom chassis portion <NUM>, according to one or more embodiments described herein.

Referring to <FIG> and <FIG>, hereinafter, the outer surface <NUM> of the bottom chassis portion <NUM> at the bottom end portion <NUM>, of the bottom chassis portion <NUM>, is referred to as a bottom surface <NUM> of the bottom chassis portion <NUM>. In some examples, the top surface <NUM> defines a platform <NUM> that may correspond to a region on which the print media <NUM> is received for printing operation. In some examples, the platform <NUM> is defined between the central axis <NUM> (passing through the first circular notch <NUM> and the third circular notch <NUM>) and the central axis <NUM> (passing through the second circular notch <NUM> and the fourth circular notch <NUM>). Further, the platform extends between the length and width of the bottom chassis portion <NUM>.

In an example embodiment, the top surface <NUM> of the bottom chassis portion <NUM> further divides the platform <NUM> into a printing region <NUM> and a periphery region <NUM>. An area of the printing region <NUM> may be defined to be proportional to a maximum size of the print media <NUM> supported by the printing apparatus <NUM>. In some examples, the periphery region <NUM> surrounds the printing region <NUM>.

In an example embodiment, the top surface <NUM> of the bottom chassis portion <NUM> defines a plurality of orifices 364a, 364b,. , 364n that extends from the top surface <NUM> of the bottom chassis portion <NUM> to the bottom surface <NUM> of the bottom chassis portion <NUM>. At the bottom surface <NUM>, the bottom chassis portion <NUM> is configured to receive a fan <NUM>. In an example embodiment, the fan <NUM> may be configured to generate a negative pressure at the top surface <NUM> of the bottom chassis portion <NUM> through the plurality of orifices 364a, 364b,. In some examples, the negative pressure enables the print media <NUM> to be flat during the printing operation. In some examples, the bottom chassis portion <NUM> may be devoid of the plurality of orifices 364a, 364b,. , 364n, and the fan <NUM>, with departing from the scope of the disclosure.

In an example embodiment, the top surface <NUM> of the bottom chassis portion <NUM> further defines one or more locator features 366a, 366b, 366c, and 366d proximal to each corner of the platform <NUM>. In some examples, the one or more locator feature 366a, 366b, 366c, and 366d may correspond to a recess defines on the platform <NUM> that is configured to receive the one or more locator pins 944a, 944b, 944c, and 944d on the top chassis portion <NUM>. In an example embodiment, the one or more locator features 366a, 366b, 366c, and 366d and the one or more locator pins 944a, 944b, 944c, and 944d facilitate alignment between the top chassis portion <NUM> and the bottom chassis portion <NUM> during coupling of the top chassis portion <NUM> with the bottom chassis portion <NUM>.

<FIG> illustrates a section view of the print engine assembly <NUM>, when a sectional plane <NUM> passes through the print engine assembly <NUM>, according to one or more embodiments described herein.

Referring to <FIG>, the print head <NUM> is coupled to the top chassis cap <NUM> through the first biasing member <NUM> and the second biasing member <NUM>. As discussed, the first biasing member <NUM> and the second biasing member <NUM> exert a downward force on the print head <NUM> to cause a portion <NUM> of the offset pin 350a and a portion <NUM> of the offset pin 350c (coupled to the first flange region <NUM> and the third flange region <NUM>) to extend out from the bottom end portion <NUM> of the top chassis portion <NUM>. More particularly, the portion <NUM> of the offset pin 350a and the portion <NUM> the offset pin 350c may extend out from the first offset through hole <NUM> and the third offset through hole <NUM> (defined on the first base plate <NUM> and the second base plate <NUM>, respectively), respectively.

In some examples, the offset pin 350a and the offset pin 350c abut the top surface <NUM> of the bottom chassis portion <NUM>. More particularly, the first end <NUM> of the offset pin 350a and the offset pin 350c abuts the periphery region <NUM> of the platform <NUM> (defined on the bottom chassis portion <NUM>). In some examples, as the first biasing member <NUM> and the second biasing member <NUM> exert a downward force on the print head <NUM>, the first end <NUM> of the offset pin 350a and offset pin 350c remains abutted to the periphery region <NUM> of the platform <NUM> (defined the bottom chassis portion <NUM>). Accordingly, the abutting of the plurality of offset pins 350a, 350b, 350c, and 350d with the top surface <NUM> of the bottom chassis portion <NUM> causes the bottom surface <NUM> of the print head <NUM> to be positioned at a predetermined distance (depicted by <NUM>) from the top surface <NUM> of the bottom chassis portion <NUM>. In some examples, the predetermined distance (depicted <NUM>) may be determined based on a focal length of the laser light source unit <NUM> (installed in the print head <NUM>). In an example embodiment, the predetermined distance is determined in such that the laser light source unit <NUM> (installed in the print head <NUM>) focusses the light from the laser light source <NUM> on the top surface <NUM> of the bottom chassis portion <NUM> during the printing operation.

Additionally, in some examples, the abutting of the plurality of offset pins 350a, 350b, 350c, and 350d ensures that the bottom surface <NUM> of the print head <NUM> is parallel to the top surface <NUM> of the bottom chassis portion <NUM>. Accordingly, the print operation performed by such an arrangement of the print head <NUM> 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 350a, 350b, 350c, and 350d are adjustable by either rotating the plurality of offset pins 350a, 350b, 350c, and 350d clockwise or anti-clockwise. Accordingly, the predetermined distance between the bottom surface <NUM> of the print head <NUM> and the top surface <NUM> of the bottom chassis portion <NUM> is adjustable. Such flexibility allows calibration of the print head <NUM> prior to printing operation. For example, due to mechanical vibrations in the printing apparatus <NUM>, the predetermined distance (depicted <NUM>) between the print head <NUM> and the top surface <NUM> of the bottom chassis portion <NUM> gets modified. The adjustability of the length of the portion of the plurality of offset pins 350a, 350b, 350c, and 350d extending out from the bottom end portion <NUM> of the top chassis portion <NUM> allows the print head <NUM> to repositioned with respect to the bottom chassis portion <NUM> (for example at the predetermined distance from the bottom chassis portion <NUM>).

The positioning of the print head <NUM> on the top surface <NUM> of the bottom chassis portion <NUM> is further illustrated in <FIG> illustrates a perspective view of the print engine assembly <NUM> with the top chassis portion <NUM> removed, according to one or more embodiments described herein.

As shown, the print head <NUM> rests on the top surface <NUM> of the bottom chassis portion <NUM> through the plurality of offset pins 350a, 350b, 350c, and 350d. The plurality of offset pins 350a, 350b, 350c, and 350d ensures that the predetermined distance (depicted by <NUM>) is maintained between the bottom surface <NUM> of the print head <NUM> and the top surface <NUM> of the bottom chassis portion <NUM>. Further, it can be observed that the bottom surface <NUM> of the print head <NUM> is parallel to the top surface <NUM> of the bottom chassis portion <NUM>.

In some examples, the scope of the disclosure is not limited to the plurality of offset pins 350a, 350b, 350c, and 350d being attached to the print head <NUM>. In an alternate embodiment, not according to the invention, the plurality of offset pins 350a, 350b, 350c, and 350d maybe attached to the bottom chassis portion <NUM> and may be configured to abut the bottom surface <NUM> of the print head <NUM> to maintain the predetermined distance between the bottom chassis portion <NUM> and the print head <NUM>. In such an implementation, the top surface <NUM> of the bottom chassis portion <NUM> may define one or more recesses that may be configured to receive the plurality of offset pins 350a, 350b, 350c, and 350d. The plurality of offset pins 350a, 350b, 350c, and 350d may orthogonally extend out from the top surface <NUM> of the bottom chassis portion <NUM>.

When the top chassis portion <NUM> is coupled with the bottom chassis portion <NUM>, the plurality of offset pins 350a, 350b, 350c, and 350d are received though the first offset through hole <NUM>, the second offset through hole <NUM>, the third offset through hole <NUM> and the fourth offset through hole <NUM>. Further, the plurality of offset pins 350a, 350b, 350c, and 350d may abut the bottom surface <NUM> of the print head causing the bottom surface <NUM> of the print head to be positioned at the predetermined distance from the top surface <NUM> of the bottom chassis portion <NUM>.

In yet another implementation, the plurality of offset pins 350a, 350b, 350c, and 350d may be movably coupled to first base plate <NUM> and the second base plate <NUM> at the first offset through hole <NUM>, the second offset through hole <NUM>, the third offset through hole <NUM> and the fourth offset through hole <NUM>. In some examples, the plurality of offset pins 350a, 350b, 350c, and 350d may be configured to move along the vertical axis <NUM> of the print engine assembly <NUM>. When the top chassis portion <NUM> is coupled with the bottom chassis portion <NUM>, the first end <NUM> of the plurality of offset pins 350a, 350b, 350c, and 350d may abut the top surface <NUM> of the bottom chassis portion <NUM>. Further, the second end <NUM> of the plurality of offset pins 350a, 350b, 350c, and 350d may abut the bottom surface <NUM> of the print head <NUM>. Accordingly, the plurality of offset pins 350a, 350b, 350c, and 350d ensure maintenance of the predetermined distance between the print head <NUM> and the bottom chassis portion <NUM>.

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.

Claim 1:
A print engine assembly (<NUM>) comprising:
a bottom chassis portion (<NUM>) including a platform that is configured to receive print media for printing content;
a top chassis portion (<NUM>);
a top chassis cap (<NUM>) received on the top chassis portion;
a print head (<NUM>) positioned within the top chassis portion;
a plurality of offset pins (<NUM>) extending out orthogonally from a bottom surface (<NUM>) of the print head, wherein the plurality of offset pins abuts the platform defined on the bottom chassis portion, and wherein a length of the plurality of offset pins extending out from the bottom surface of the print head is adjustable, so that the plurality of offset pins enables the print head to be positioned at an adjustable predetermined distance from the bottom chassis portion; and
at least one biasing member (<NUM>, <NUM>), wherein a first end of the at least one biasing member is coupled to the top chassis cap and a second end of the at least one biasing member is coupled to a top end portion (<NUM>) of the print head.