Abstract:
An apparatus for a fluidic ejection device and a fluidic ejection device containing the apparatus. The apparatus includes a pivot member having at least a first position and a second position, a shaft attached on a first end thereof to the pivot member and on a second end distal from the first end to a capping structure, wherein pivot of the pivot member pivots the capping structure from a first capped position to a second uncapped position adjacent an ejection head of the fluidic ejection device.

Description:
TECHNICAL FIELD 
       [0001]    The disclosure is directed to fluidic structures and the maintenance apparatus for fluidic ejection devices. 
       BACKGROUND AND SUMMARY 
       [0002]    One of the applications of fluidic structures is to jet a solution on to another device where a secondary function may be performed. A common secondary function is to vaporize a solution using a heater such that the contents of the solution can be vaporized so as to deliver the solution as a gaseous substance. Applications of such technology include, but are not limited to, metering and vaporizing device for electronic cigarettes, vapor therapy, gaseous pharmaceutical delivery, vapor phase reactions for micro-labs, and the like. In all of these applications, a fluidic ejection head is used to eject fluid onto a heated surface for vaporization of the fluid into a discharge conduit. For some applications, the fluids to be ejected have relatively low vaporization temperatures and thus can evaporate over time through ejection nozzles in the ejection head. For other applications, contamination of the ejection head between uses may be a problem. In some applications, the fluids may leave a residue on the ejection head that will, over time, inhibit the proper ejection of fluid from the ejection head or that may plug the ejection nozzles. Maintaining such devices so that precise fluid ejection is obtained is a problem due to the small size of such devices. Conventional maintenance devices for fluidic ejection heads require a relatively large area for capping and cleaning the ejection heads. 
         [0003]    Accordingly, what is needed is an apparatus that can be operated to protect the ejection head when the device is not in use and can be used to clean the ejection head in order to maintain proper ejection of fluid. 
         [0004]    In view of the foregoing, embodiments of the disclosure provide an apparatus for a fluidic ejection device and a fluidic ejection device containing the apparatus. The apparatus includes a pivot member having at least a first position and a second position, a shaft attached on a first end thereof to the pivot member and on a second end distal from the first end to a capping structure, wherein pivot of the pivot member pivots the capping structure from a first capped position to a second uncapped position adjacent an ejection head of the fluidic ejection device. 
         [0005]    In one embodiment there is provided a fluidic ejection device that includes a fluidic ejection head in fluid flow communication with a fluid reservoir, a heater for vaporizing fluid ejected from the fluidic ejection head, an exit conduit in flow communication from the heater, an ejection head capping structure disposed between the heater and the fluidic ejection head, and a selection device operatively connected to the ejection head capping structure for moving the capping structure from a first capped position to a second uncapped position adjacent the fluidic ejection head. 
         [0006]    In another embodiment, the capping structure includes a nozzle cap for capping the ejection head when the pivot member is pivoted to the first capped position. 
         [0007]    In other embodiments, the capping structure includes an aperture therein for fluid flow therethrough when the pivot member is pivoted to the second uncapped position and a wiper blade for cleaning the ejection head when the pivot member is pivoted to the first capped position and to the second uncapped position. 
         [0008]    In some embodiments, the pivot member is disposed on a vapor exit conduit of the fluidic ejection device. In other embodiments, the capping structure is moved between the first and second positions by a selection device operatively connected to the ejection head capping structure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    Other features and advantages of the inventive may be evident by reference to the following detailed description, drawings and claims wherein: 
           [0010]      FIG. 1  is a perspective view of a fluidic ejection device according to an embodiment of the disclosure. 
           [0011]      FIG. 2A  is a top perspective view, not to scale, of a capping structure for a fluidic ejection head according to a first embodiment of the disclosure. 
           [0012]      FIG. 2B  is a bottom perspective view, not to scale, of a capping structure for a fluidic ejection head according to a first embodiment of the disclosure. 
           [0013]      FIG. 3  is a plan bottom view, not to scale, of the capping structure of  FIG. 2 . 
           [0014]      FIG. 4  is an elevational view not to scale, of the capping structure of  FIG. 2 . 
           [0015]      FIG. 5  is a plan bottom view, not to scale, of an alternative capping structure according to the disclosure. 
           [0016]      FIG. 6  is an elevational view, not to scale, of a fluidic ejection device according to one embodiment of the disclosure. 
           [0017]      FIG. 7  is a partial elevational view, not to scale, of an ejection head and capping structure for the fluidic ejection device of  FIG. 6 . 
           [0018]      FIG. 8  is top plan view, not to scale, through an exit conduit of a fluidic ejection device showing a capping structure in a first capping position. 
           [0019]      FIG. 9  is top plan view, not to scale, through an exit conduit of a fluidic ejection device showing a capping structure in a second uncapped position. 
           [0020]      FIG. 10  is a partial elevational view, not to scale, of a capping structure for a fluidic ejection device according to another embodiment of the disclosure. 
           [0021]      FIG. 11  is top plan view, not to scale, through an exit conduit of a fluidic ejection device showing the capping structure of  FIG. 10  in a first capping position for the fluidic ejection device. 
           [0022]      FIG. 12  is top plan view, not to scale, through an exit conduit of a fluidic ejection device showing the capping structure of  FIG. 10  in a second uncapped position for the fluidic ejection device. 
           [0023]      FIG. 13 , is an elevational view, not to scale, of a fluidic ejection device according to the embodiment of  FIG. 10 . 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0024]    The disclosure is directed to fluidic ejection and vaporizing devices  10  as shown generally in  FIG. 1 . Such devices  10  may be used for a wide variety of applications wherein a liquid is ejected onto a vaporizing heater to provide a vapor stream as described in more detail below. Such devices  10  are typically hand held devices such as electronic cigarettes that have a mouth piece  12  for inhaling vapors generated by the device  10 . The mouthpiece  12  may include a vapor exit conduit  14  for flow of vapors out of the device  10 . The liquid to be vaporized is typically contained with the body of the device  10  or in a separately removable cartridge. A fluidic ejection head is provided in fluid flow communication with the liquid container and provides a preselected amount of liquid to the vaporizing heater. As described above, it may be necessary to prevent excess evaporation from the fluidic ejection head and/or prevent contamination of the ejection head when the ejection head is not in use. However, the small size of the fluidic ejection device makes it difficult to use any kind of conventional capping mechanism for the ejection head. 
         [0025]    With reference to  FIGS. 2-5 , there is provided a capping structure  16  that may be used to provide capping and cleaning functions to a fluidic ejection head for the fluidic ejection device  10  described above. In one embodiment,  FIGS. 2A and 2B  show perspective views of the capping structure  16 ,  FIG. 3  shows a bottom plan view of the capping structure  16  and  FIG. 4  shows an elevational view of the capping structure  16 . The capping structure  16  has a triangular-shape and includes an ejection head cap  18 , a wiper blade  20 , and an aperture  22 . The capping structure  16  is configured to be pivoted over the ejection head to provide a capping function, a cleaning function and an uncapped function. As shown in  FIG. 4 , the ejection head cap  18  and the wiper blade  20  are configured to come in contact with the ejection head. During pivot of the capping structure  16  from a first capping position to a second uncapped position, the wiper blade  20  sweeps across the ejection head to remove debris and contaminants from the ejection head. 
         [0026]    In an alternative embodiment shown in  FIG. 5 , the capping structure  24  is configured to contain only an ejection head cap  26  and a wiper blade  28 . Accordingly, pivot of the capping structure  24  from a capped position to an uncapped position provides the same capping and cleaning functions as the capping structure  16 , but requires a smaller structure  24  that can be moved past ejection nozzles of a fluidic ejection head without interfering with fluid ejection from the fluidic ejection head. 
         [0027]    With reference to  FIGS. 6 and 7 , there is shown a fluidic ejection device  10  that includes the capping structure  16  and a mechanism for moving the capping structure  6  from a capped position to an uncapped position. As shown, in  FIGS. 6 and 7 , the capping structure  16  is disposed in the fluidic ejection device  10  between a fluidic ejection head  30  and a vaporizing heater  32 . In the capped position, the ejection head cap  18  is disposed over ejection nozzles  34  of the ejection head  30  to prevent evaporation and ejection of fluid from a fluid reservoir  36  attached to the ejection head  30 . The capping structure  16  is attached by means of a shaft  38  and linkages  42  and  44  to a pivot member  46  for pivoting the capping structure over the ejection head  30  to cap, clean and uncap the ejection head as shown in  FIGS. 8-9 . The shaft  38  may be rotatably attached to an inner wall  40  of the fluidic ejection device  10 . In the first position shown in  FIG. 8 , the capping structure  16  is in the capped position which is signified as an “off” position. In the off position, fluid is prevented from escaping from the ejection head  30  and thus no vapor is generated by the fluidic ejection device  10 .  FIG. 9  shows the capping structure  16  in a second uncapped position, signified as the “on” position, wherein aperture  22  is disposed over the ejection head nozzles  34  so that fluid can be ejected onto the vaporizing heater  32 . When moving the capping structure  16  from the off to on positions or from the on to off positions, the wiper blade  20  is caused to sweep across the ejection head  30  to remove debris and contaminants from the ejection head  30 . 
         [0028]    As shown in  FIG. 6 , the capping structure  16 , ejection head  30  and vaporizing heater  32  are positioned in the fluidic ejection device  10  so that vapors generated by the vaporizing heater  32  may be exhausted through a vapor exit conduit  14  of the mouth piece  12  ( FIG. 1 ) of the fluidic ejection device. Accordingly, as shown in  FIG. 6 , the pivot member  46  is disposed on the vapor exit conduit  14  for manually moving the capping structure  16  between the capped and uncapped positions. The pivot member  46  may include an indicator  48  to show if the ejection head is capped or uncapped (off or on). Accordingly, a user may easily determine if the fluidic ejection device  10  is in condition for use. 
         [0029]    In the embodiment shown in  FIGS. 6-9 , the entire mechanism for capping and uncapping the ejection head  30  is disposed in and adjacent to the vapor exit conduit  14 . Accordingly, there is no special sealing arrangement needed to prevent vaporized fluids from escaping from the fluidic ejection device  10 . 
         [0030]    In another embodiment, illustrated in  FIGS. 10-12 , a slide lever  50  is used to position the capping structure  16  with respect to the ejection head  30 . The slide lever  50  is attached by means of shaft  38  to the capping structure  16  for moving the capping structure  16  between the first capped position to the second uncapped position as shown in  FIGS. 11 and 12 . In this embodiment in  FIG. 13 , the slide lever  50  is disposed through a slot  52  in the body  54  of the fluidic ejection device. The slot  52  may include a sealing flap (not shown) to prevent vapors from escaping from the slot when the capping structure is in the “on” position. 
         [0031]    The capping structure  16 , as well as the body  54  of the fluidic ejection device may be made from a wide variety of materials including plastics, metals, glass, ceramic and the like provided the materials are compatible with the fluids to be ejected and vaporized by the device  10 . A particularly suitable material may be selected from polyvinyl chloride, high density polyethylene, polycarbonate, stainless steel, surgical steel, and the like. All parts, including the mouthpiece  12 , vapor exit conduit  14 , and body  54  that come in contact with fluids and vapors may be made of plastic. The wiper blade  20  may be made of a resilient material such as an elastomeric material, natural rubber, fluoropolymer, and the like for wiping the ejection head  30 . As with the other components of the fluidic ejection device the wiper blade  20  should be made of a material that is resistant to the fluids used in and vapors generated by the fluidic ejection device  10 . 
         [0032]    While particular embodiments have been described, alternatives, modifications, variations, improvements, and substantial equivalents that are or can be presently unforeseen can arise to applicants or others skilled in the art. Accordingly, the appended claims as filed and as they can be amended are intended to embrace all such alternatives, modifications variations, improvements, and substantial equivalents.