Cam-actuated lever capping arm

Information

  • Patent Grant
  • 6533386
  • Patent Number
    6,533,386
  • Date Filed
    Monday, November 27, 2000
    23 years ago
  • Date Issued
    Tuesday, March 18, 2003
    21 years ago
Abstract
A method and system for a cam-actuated lever capping arm for use in a maintenance station of an ink jet printer, the printer including a bi-directional translatable carriage supporting a print cartridge having a print head with nozzles in a nozzle face for printing ink droplets ejecting from said nozzles onto a recording medium at a printing zone in the printer, the translatable carriage being controlled by drive members under the control of a printer controller, the maintenance station being positioned at one side of the printing zone for translation of a print cartridge thereto on the translatable carriage for capping by the cap carriage, the cap carriage including, a pair of movable caps for sealing the nozzles in the printhead nozzle face, and a cam-actuated lever for moving the cap into a position in which the cap seals against the printhead nozzle face.
Description




BACKGROUND OF THE INVENTION




1. Field of Invention




This invention relates to maintenance stations for ink jet printing apparatus.




2. Description of Related Art




Fluid ejection systems, such as ink jet printers, have at least one fluid ejector head that directs droplets of fluid towards a receiving medium. Within the fluid ejector head, the fluid may be contained in a plurality of channels. Energy pulses are used to expel the droplets of fluid, as required, from orifices at the ends of the channels.




In a thermal fluid ejection system, such as a thermal ink jet printer, the energy pulses are usually produced by resistors. Each resistor is located in a respective one of the channels, and is individually addressable by current pulses to heat and vaporize fluid in the channels. As a vapor bubble grows in any one of the channels, fluid bulges from the channel orifice until the current pulse has ceased and the bubble begins to collapse. At that stage, the fluid within the channel retracts and separates from the bulging fluid to form a droplet moving in a direction away from the channel and towards the receiving medium. The channel is then re-filled by capillary action, which in turn draws fluid from a supply container. Operation of a thermal ink jet printer is described in, for example, U.S. Pat. 4,849,774, incorporated herein by reference in its entirety.




A carriage-type thermal ink jet printer is described in U.S. Pat. No. 4,638,337, incorporated herein by reference in its entirety. That printer has a plurality of printheads, each with its own ink tank cartridge, mounted on a reciprocating carriage. The channel orifices in each printhead are aligned perpendicular to the line of movement of the carriage. A swath of information is printed on the stationary receiving medium as the carriage is moved in one direction. The receiving medium is then stepped, perpendicular to the line of carriage movement, by a distance equal to or less than the width of the printed swath. The carriage is then moved in the reverse direction to print another swath of information.




The fluid ejecting orifices of a fluid ejector head need to be maintained, for example, by periodically cleaning the orifices when the fluid ejection system is in use, and/or by capping the fluid ejector head when the fluid ejection system is out of use or is idle for extended periods. Capping the fluid ejector head is intended to prevent the fluid in the fluid ejector head from drying out. The cap provides a controlled environment to prevent fluid exposed in the nozzles from drying out.




A fluid ejector head may also need to be primed before initial use, to ensure that the fluid ejector head channels are completely filled with the fluid and contain no contaminants or gas bubbles. After significant amounts of ejecting, and at the discretion of the user, an additional but reduced volume prime may be used to clear particles or gas bubbles that can cause defects in the ejected swath of information. Maintenance and/or priming stations for the printheads of various types of ink jet printers are described in, for example, U.S. Pat. Nos. 4,364,065; 4,855,764; 4,853,717 and 4,746,938, while the removal of gas from the ink reservoir of a printhead during printing is described in U.S. Pat. No. 4,679,059, each incorporated herein by reference in its entirety.




The priming operation, which usually involves either forcing or drawing fluid through the fluid ejector head, can leave drops of fluid on the face of the fluid ejector head. As a result, fluid residue builds up on the fluid ejector head face. This fluid residue can have a deleterious effect on the quality of the ejected swath of information. Material from the receiving medium and other foreign material can also collect on the fluid ejector head face while ejecting fluid. Like the fluid residue, this foreign material can also have deleterious effects on the quality of the ejected swath of information.




The 717 patent discloses moving a printhead across a wiper blade at the end of a printing operation so that dust and other contaminants are scraped off the orifice before the printhead is capped, and capping the printhead nozzle by moving the printer carriage acting on a sled carrying the printhead cap. This eliminates the need for a separate actuating device for the cap. The 938 patent discloses providing an ink jet printer with a washing unit which, at the end of the printing operation, directs water at the face of the printhead to clean the printhead before it is capped.




SUMMARY OF THE INVENTION




This invention provides a cam-activated lever capping arm for a maintenance station for a fluid ejector head that carries and actuates one or more caps movably mounted on a cap carriage to cap the fluid ejector head nozzles.




In one exemplary embodiment of the maintenance station according to this invention, one or more caps are mounted on a translatable carriage and moves with the carriage. When the fluid ejection system is ejecting fluid, the translatable carriage is located in an ejection zone, where the one or more fluid ejector heads can eject fluid onto a receiving medium. When the fluid ejection system is placed into a non-ejection mode, the translatable carriage can be translated to the maintenance station located outside and to one side of the ejection zone. Once the cartridge is translated to the maintenance station, various maintenance functions can be performed on the one or more fluid ejector heads of the fluid ejection system depending on the rotational position of a cam shaft in the maintenance station. The cam shaft rotates in one direction, such as, for example, counterclockwise, to engage and drive the hardware that in turn operates the individual maintenance functions.




Rotating the cam shaft activates various maintenance mechanisms of the maintenance station, including a cap carriage. After the one or more fluid ejector heads arrive at the maintenance station, a vacuum pump is energized, and the cap carriage is elevated to the position where the one or more caps engage the one or more fluid ejector heads. The one or more caps are mounted on the cap carriage in a capping location. The fluid ejector heads are primed when a pinch tube mechanism opens one or more pinch tubes connected to the one or more caps. Opening the pinch tubes releases negative pressure created by the vacuum pump. In response, fluid is drawn from the one or more fluid ejector heads into the one or more caps.




The vacuum pump is then deenergized, while the cap carriage remains in position so that the one or more caps cap the one or more fluid ejector heads awaiting the ejection mode of the fluid ejection system. Thus, the one or more fluid ejector heads remain capped at the maintenance station until the fluid ejection system is placed into the ejection mode.




These and other features and advantages of this invention are described in or are apparent from the detailed description of various exemplary embodiments of the systems and methods according to this invention.











BRIEF DESCRIPTION OF THE DRAWINGS




Various exemplary embodiments of this invention will be described in detail with reference to the following figures, wherein like numerals represent like elements, and wherein:





FIG. 1

is a schematic front elevation view of an ink jet printer and a maintenance station according to this invention;





FIG. 2

is a top perspective view of the interior of the maintenance station of

FIG. 1

according to this invention;





FIG. 3

is a partial perspective view of the cam shaft of

FIG. 2

;





FIG. 4

is a top plan view of one exemplary embodiment of the cam-actuated lever capping arm according to this invention; and





FIG. 5

is a partial perspective view of the cam-actuated lever capping arm.











DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS




The following detailed description of various exemplary embodiments of the fluid ejection systems according to this invention are directed to one specific type of fluid ejection system, an ink jet printer, for sake of clarity and familiarity. However, it should be appreciated that the principles of this invention, as outlined and/or discussed below, can be equally applied to any known or later developed fluid ejection system, beyond the ink jet printer specifically discussed herein.





FIG. 1

shows an ink jet printer


10


, including one or more printheads


12


, shown in dashed line, fixed to an ink supply cartridge


14


. The ink supply cartridge


14


is removably mounted on a carriage


16


. The carriage


16


is translatable back and forth on one or more guide rails


18


as indicated by an arrow


20


, so that the one or more printheads


12


and the ink supply cartridge


14


move concurrently with the carriage


16


. Each of the one or more printheads


12


contains a plurality of ink channels which terminate in nozzles


22


in a nozzle face


23


(both shown in dashed line). The ink channels carry ink from the ink supply cartridge


14


to the printhead nozzles


22


.




When the ink jet printer


10


is in a printing mode, the carriage


16


translates or reciprocates back and forth across and parallel to a printing zone


24


(shown in dashed line). Ink droplets are selectively ejected on demand from the printhead nozzles


22


onto a receiving medium, such as paper, positioned in the printing zone, to record information on the recording medium one swath or portion at a time. During each pass or translation in one direction of the carriage


16


, the receiving medium is stationary. At the end of each pass, the recording medium is stepped in the direction of the arrow


26


for the at most distance or the height of one printed swath. U.S. Pat. No. 4,571,599 and Re. 32,572, each incorporated herein by reference in its entirety, provide a more detailed explanation of the printhead and the printing operation.




When the ink jet printer


10


is no longer in a printing mode, the carriage


16


travels to a maintenance station


1000


spaced from the printing zone


24


, With the one or more printheads


12


positioned at the maintenance station


1000


, various maintenance functions can be performed on the one or more printheads


12


.




In contrast to copending U.S. patent application Ser. No. 09/594,693, incorporated herein by reference in its entirety, the cam shaft


100


rotates in a single direction. In various exemplary embodiments, this single direction is the counterclockwise direction. However, depending on the relative orientations of the various elements of the maintenance station, the cam shaft


100


can rotate only clockwise. Additionally, as described in U.S. patent application Ser. No. 09/594,695, incorporated herein by reference in its entirety, the cam shaft


100


can rotate in both a clockwise and counterclockwise direction, depending upon the activation required by a particular maintenance function and/or timing sequence.





FIG. 2

is a top perspective view of the maintenance station


1000


. As shown in

FIG. 2

, the maintenance station


1000


includes a cam shaft


100


, a cam-actuated lever capping arm


200


, and a cap carriage


300


. In particular, as shown in

FIG. 2

, and more clearly seen in

FIG. 3

, the cam shaft


100


includes at least a driving and control portion


110


, and a cam-actuated lever capping arm drive portion


130


.




In various exemplary embodiments, as shown in

FIGS. 2 and 3

, the driving and control portion


110


may, for example, include a sensor wheel


112


, an optical window


114


formed in the sensor wheel


112


, and a main drive gear


116


. In operation, a drive gear train (not shown), comprising a drive motor connected to one or more drive gears, engages the main drive gear


116


to drive the cam shaft


100


in counterclockwise direction to actuate the various maintenance functions enabled by the maintenance station


1000


. This is described in greater detail in copending U.S. patent application Ser. No. 09/594,694, incorporated herein by reference in its entirety.




In a first reference position of the cam shaft


100


, the optical window


114


is aligned with an optical relay (not shown). Thus, after the drive gear train drives the main drive gear


116


to rotate the cam shaft


100


, for example, one complete revolution, the optical window


114


formed in the sensor wheel


112


is again aligned with the optical relay. In various exemplary embodiments, the optical relay includes a photo-emitter positioned on one side of the sensor wheel


112


and a photo-detector positioned on the other side of the sensor wheel


112


. When the optical window


114


is not aligned with the optical relay, the optical relay is in an opened circuit condition.




At the start of a maintenance operation, with the sensor wheel


112


at the first reference position and the optical window


114


is aligned with the optical relay to close the circuit through the optical relay. As a result, when the one or more printheads


12


are aligned with the maintenance station


1000


and the main drive gear


116


is initially driven in the counterclockwise direction, the optical window


114


is no longer aligned with the optical relay and the optical relay is placed into an open circuit condition. Then, the sensor wheel


112


again advances the window


114


into alignment with the optical relay. As a result, the optical relay is placed in the closed circuit condition.




The open and closed circuit conditions of the optical relay are sensed by a controller (not shown). In response, the controller stops the gear train engaged with the main drive gear


116


from turning the cam shaft


100


for a predetermined time. In particular, this predetermined time depends on the priming mode currently selected for the maintenance station


1000


.




Once the predetermined time has elapsed, the controller starts the gear train to drive the main drive gear


116


, and thus the cam shaft


100


, in the counterclockwise direction. The cam shaft


100


continues rotating in the counterclockwise direction until the optical window


114


in the sensor wheel


112


is again aligned with the optical relay to again put the optical relay in a closed circuit condition. When the controller again senses the closed circuit condition of the optical relay, the controller again stops the gear train from driving the main drive gear


116


, and thus the cam shaft


100


, in the counterclockwise direction.




In particular, in various exemplary embodiments, depending on the rotational position of the camshaft


100


, when the cam shaft


100


rotates in the counterclockwise direction, the cam-actuated lever capping arm drive portion


130


interacts with a cam-actuated lever arm


200


to move a cap carriage


300


from a disengaged position to an engaged position or from the engaged position to the disengaged position. The cap carriage


300


approaches the one or more printheads


12


at a slight angle from normal (i.e., perpendicular to the nozzle face


23


), to rollingly engage the one or more printheads


12


with one or more printhead caps


600


. The rolling engagement of the one or more printheads


12


with the one or more printhead caps


600


causes the leading edge portions


610


of the one or more printhead caps


600


to first contact the one or more printheads


12


. As the cam shaft


100


continues to rotate further in the counterclockwise direction, the rolling engagement of the one or more printheads


12


with the one or more printhead caps


600


causes each of the one or more printhead caps


600


to gradually engage the printheads


12


until the trailing edge portions


620


of the one or more printhead caps


600


eventually contact the one or more printheads


12


.




By rollingly engaging the one or more printheads


12


with the one or more printhead caps


600


, the impact force is evenly distributed to the one or more printheads


12


through the entire time over which the one or more printhead caps


600


rollingly engages the one or more printheads


12


. That is, rollingly engaging the one or more printheads with the impact force of the one or more printhead caps


600


tends to reduce the impact force against the one or more printheads


12


, by spreading the contact force out over the period between the one or more printheads


12


contacting the leading edge portions


610


of the one or more printhead caps


600


and the trailing edge portions


620


of the one or more printhead caps


600


. Additionally, in various exemplary embodiments, by spreading the contact force out over a period of time, the possibility of de-priming the one or more printheads


12


is reduced.




During the rolling engagement between the leading edge portions


610


of the one or more printhead caps


600


and the trailing edge portions


620


of the one or more printhead caps


600


, the air contained in the one or more printhead caps


600


is allowed to escape before the one or more printhead caps


600


are fully engaged over the one or more printheads


12


. By allowing the air to escape, and not forcing air down through the nozzles of the one or more printheads


12


, the de-priming one or more printheads


12


becomes less likely.




In various exemplary embodiments, once in the engaged position, one or more printhead caps


600


carried by the cap carriage


300


remain engaged with the one or more printheads


12


, while the cam shaft


100


continues to rotate in the counterclockwise direction. Several exemplary embodiments of the structure and operation of the printhead caps


600


are described in greater detail in copending U.S. patent applications Ser. No. 09/594,682 and 09/594,690 each incorporated herein by reference in its entirety.




As outlined above, the cap carriage


300


includes one or more printhead caps


600


. As outlined above, when the cap carriage


300


is moved from the disengaged position to the engaged position by the cam-actuated capping lever arm


200


, the one or more printhead caps


600


engage the nozzle faces


23


of one or more printheads


12


. In particular, each of the printhead caps


600


needs to securely engage the nozzle face


23


of one of the one or more printheads


12


to ensure the negative pressure applied through one or more pinched tubes (not shown) is able to withdraw ink from the ink channels of the corresponding printhead


12


.




That is, if the printhead cap


600


does not securely engage the nozzle face


23


of the corresponding printhead


12


, the negative pressure applied through the one or more pinched tube (not shown) merely draws atmospheric into the interior of the printhead cap


600


rather than withdrawing ink from the ink channels of the corresponding printhead


12


. Accordingly, in various exemplary embodiments of the printhead cap


600


, the printhead caps


600


are provided with a compressible gasket


650


. However, even with the compressible gasket


650


, the printhead caps


600


cannot securely engage the printhead nozzle faces


23


if the printhead caps


600


are not substantially parallel to, and biased against, the nozzle faces


23


.




Accordingly, as shown in

FIGS. 2 and 4

, the printhead caps


600


are not mounted on the cap carriage


300


in a fixed position. Rather, as shown in

FIG. 2

, in various exemplary embodiments, printhead caps


600


are mounted using a cap gimbal structure. The cap carriage portion of the cap gimbal structure includes four support springs


310


,


320


,


330


and


340


; four support tabs


315


,


325


,


335


and


345


; two pivot tabs


350


and


360


; and two pivot tab receiving slots


370


and


380


.




The four support tabs


315


,


325


,


335


and


345


fit within and hold in position one end of the four support springs


310


,


320


,


330


and


340


, on each of a first cap mounting position


302


and a second cap mounting position


304


, of the cap carriage


300


. The two pivot tabs


350


and


360


are located, respectively, on the leading edge portion


610


and the trailing edge portion


620


, of the one or more printhead caps


600


. The two pivot tab receiving slots


370


and


380


are located, respectively, on the leading wall portion


306


and the trailing wall portion


308


, of a first cap mounting position


302


, and a second cap mounting position


304


, of the cap carriage


300


. The two pivot tabs


350


and


360


slide into the two pivot receiving slots


370


and


380


, to engage and biasedly support against the four support springs


310


,


320


,


330


and


340


, the one or more printhead caps


600


.




As a result, the printhead cap


600


, using this gimbal structure according to this invention, has at least two degrees of rotational freedom. Accordingly, when that printhead cap


600


is biased against the corresponding nozzle face


23


, the printhead cap


600


will securely engage the nozzle face


23


so that the negative pressure applied through the pinch tube (not shown) is able to withdraw ink from the ink channels of that printhead


12


, rather than merely drawing ambient air from the region surrounding the nozzle face


23


of that printhead


12


.




Likewise, after the cam-actuated lever capping arm drive portion


130


moves the capping station


300


from the disengaged position to the engaged position, the cam shaft


100


rotates further in the counterclockwise direction. As a result, in various exemplary embodiments, a pinch tube actuating portion actuates one or more pinch tubes to apply the negative pressure to the one or more printheads cap


600


mounted on the cap carriage


300


. Several exemplary embodiments of the structure and operation of the pinch tubes and pinch mechanism is described in greater detail in copending U.S. patent application Ser. No. 09/594,680, incorporated herein by reference in its entirety. The cam shaft


100


then continues to rotate in the counterclockwise direction until the cam shaft


100


has traveled, for example, approximately 180 degrees from the first reference position. In various exemplary embodiments, the controller, based on the signal from the optical relay generated when the optical window


114


was in the first reference position and on the amount of rotation assumed for the cam shaft


100


since then, stops the cam shaft


100


when the cam shaft


100


is, for example, approximately 180 degrees out of alignment with the optical relay, and maintains the cam shaft


100


in that position for one of the predetermined times.




Then, after the predetermined time has elapsed, the controller engages the drive motor of the drive gear train to continue to rotate the cam shaft


100


in the counterclockwise direction. When the cam shaft


100


continues rotating in the counterclockwise direction, the pinch tube actuation portion again interacts with the one or more pinch tubes before the cap carriage


300


is moved from the engaged position to the disengaged position by the cam-actuated lever capping arm drive portion


130


.




As shown in

FIGS. 2 and 3

, the various elements of the cam shaft drive portion


110


, and the cam-actuated lever capping arm drive portion


130


are mounted on a shaft


102


of the cam shaft


100


.




In the exemplary embodiments shown in

FIGS. 2-5

, the cam-actuated lever capping arm drive portion


130


of the cam shaft interacts with a cam-actuated lever arm


200


to move the cap carriage


300


from either the disengaged position to the engaged position against the one or more printheads


12


, or from the engaged position against the one or more printheads


12


to the disengaged position. The cam-actuated lever capping arm


200


includes a biasing spring


210


, as described in detail below. The biasing spring


210


operates in conjunction with the capping arm drive portion


130


to create a smooth transition of the cap carriage


300


from either the disengaged position to the engaged position against the one or more printheads


12


, or from the engaged position against the one or more printheads


12


to the disengaged position. While the cam-actuated lever capping arm drive portion


130


can include, in various exemplary embodiments, a single drive portion


130


, it should be appreciated that the drive portion


130


, may include, in various other exemplary embodiments, one or more hold down cams


132


and one or more capping cams (not shown) that actuate, drive or bias, in conjunction with actuation and/or driving, one or more engaging portion


220


of the cam-actuated lever capping arm


200


, as described in detail below.





FIGS. 4 and 5

show a top plan and a front perspective view, respectively, of the cam-actuated lever capping arm


200


. When the cam shaft


100


is in the first reference position, the cam-actuated lever capping arm


200


is fully “lowered” to place the cap carriage


300


in the disengaged position.




As shown in

FIGS. 2

,


4


and


5


, the cam-actuated lever capping arm


200


includes the biasing spring


210


having two maintenance station lever engaging portions


212


and


214


, a cam engaging portion


220


, a spring support shaft


240


having two end portions


242


and


244


, and a lever arm portion


250


. The spring support shaft


240


rotatably mounts the cam-actuated lever capping arm


200


in the maintenance station


1000


, with the two end portions


242


and


244


supported within the maintenance station


1000


. In various exemplary embodiments, the two end portions


242


and


244


of the mounting portion


240


“snap-fit” into a receiving structure (not shown) in the maintenance station


1000


. In particular, the biasing spring


210


provides a bias force acting opposite the force applied by the cam-actuated lever capping arm drive portion


130


of the cam shaft


100


against the cam engaging portion


220


due to the counterclockwise rotation of the cam shaft


100


.




In various exemplary embodiments, the cam engaging portion


220


includes a cam follower


222


having a curvilinear surface


223


and a protruding leading portion


224


. When the cam shaft


100


rotates in the counterclockwise direction, the cam-actuated lever capping arm drive portion


130


interacts with various elements of the cam engaging portion


220


.




In various exemplary embodiments, in conjunction with the biasing spring


210


, the cam-actuated lever capping arm


200


, may, for example, include a inverted cam surface as the curvilinear surface


223


of the cam follower


222


and a protruding follower portion


224


. When the cam shaft


100


rotates in the counterclockwise direction, a hold-down cam surface


133


of a hold-down cam


132


engages the cam-actuated lever capping arm drive portion


130


of the inverted cam surface. The cam follower


222


contacting the hold-down cam


132


terminates at the protruding portion


224


. The cam shaft


100


, as it rotates counterclockwise, drives the hold-down cam surface


133


of the hold-down cam


132


against the inverted cam surface


223


of the cam follower


222


until the protruding follower portion


224


contacts a notch portion


134


of the hold-down cam surface


133


.




After the hold-down cam


132


contacts the protruding portion


224


, the cam-actuated capping arm is in its fully disengaged position from the one or more printheads


12


. When the cam shaft


100


continues to rotate in the counterclockwise direction, beyond the contact with the notch portion


134


of the hold-down cam surface


133


, the spring


210


and the hold-down cam


132


, working in conjunction with each other, raise the lever arm


200


towards the engaged position so that the at least one cap


600


rollingly engage the at least one printheads


12


.




In various exemplary embodiments, many individual systems cooperate to maintain and maximize the useful life of the one or more printheads


12


, and may, for example, take place at a maintenance station. The maintenance station


1000


, may be, for example, at one side of the printer, outside of the printing zone


24


. At the end of a printing operation or upon the printer


10


terminating the printing mode, the carriage


16


is moved to the maintenance station


1000


. With the one or more printhead nozzle faces


23


positioned adjacent to the maintenance station, the controller activates the maintenance station motor to drive the maintenance station gear train (not shown).




Thus, once the one or more printhead nozzle faces


23


are capped by the one or more caps


600


, the controller may optionally have the one or more printheads


12


eject a number of ink droplets into the caps


600


.




While this invention has been described in conjunction with the exemplary embodiments outlined above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the exemplary embodiments of the invention, as set forth above, are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the invention.



Claims
  • 1. A maintenance station for a fluid ejection system having at least one fluid ejector head, comprising:a cam shaft mounted to the maintenance station; a hold down cam mounted on the cam shaft, the hold down cam having a convex-shaped portion; a rotatably mounted lever arm mounted to the maintenance station and actuated by the cam shaft, the rotatably mounted lever arm having a hold down cam engaging portion that is engageable with the hold down cam, the hold down cam engaging portion further comprising a complimentary curvilinear recess terminating in a protruding follower portion; and a cap carriage having at least one cap, wherein, the hold down cam is constructed to engage the hold down cam engaging portion in response to a rotation of the cam shaft in a first direction to cause the rotatably mounted lever arm to rotate and move the cap carriage from a first position, where the at least one cap is disengaged from the at least one fluid ejector head, to a second position where the complimentary curvilinear recess interactively receives the convex-shaped portion of the hold down cam and the at least one cap rollingly engages the at least one fluid ejector head and the hold down cam further including a notch portion that provides a fully disengaged position for the lever arm.
  • 2. The capping cam engaging portion of claim 1, further comprising:a biasing member that biases the rotatably mounted lever arm to engage the cap.
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