An inkjet printing system may include a printhead and an ink supply which supplies liquid ink to the printhead. The printhead ejects ink drops through a plurality of orifices or nozzles and toward a print medium, such as a sheet of paper, so as to print onto the print medium. Typically, the orifices are arranged in one or more arrays such that properly sequenced ejection of ink from the orifices causes characters or other images to be printed upon the print medium as the printhead and the print medium are moved relative to each other.
Use of the inkjet printing system may result in the accumulation of ink and particles, such as dust or paper fibers, on the printhead. To ensure quality print jobs, it is desirable that the accumulated ink and particles be removed from the printhead to prevent the accumulated ink and particles from dropping onto the print medium or obstructing the ejection of ink from the nozzles. In addition, during non-use of the inkjet printing system, the nozzles are exposed to air which, consequently, may cause the ink to dry out and clog the nozzles.
In order to ensure quality print jobs it would be desirable to service and maintain the printhead to avoid the aforementioned problems.
A system for servicing a non-scanning printhead includes a servicing plate, a servicing component mounted on the servicing plate and adapted to service the non-scanning printhead, and a drive system adapted to move the servicing plate between a storage position and a service position such that the servicing component is spaced from the non-scanning printhead when the servicing plate is in the storage position and the servicing component is adapted to service the non-scanning printhead when the servicing plate is in the service position.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments in which embodiments of the invention may be practiced. In this regard, directional terminology such as “up,” “down,” “forward,” “backward,” “leading,” “trailing,” “above,” “below,” etc., is used with reference to the orientation of the figure(s) being described. Because components of the embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Ink supply assembly 14 supplies ink to inkjet printhead assembly 12 and includes a reservoir 15 for storing ink. As such, ink flows from reservoir 15 to inkjet printhead assembly 12. In one embodiment, inkjet printhead assembly 12 and ink supply assembly 14 are housed together to form an inkjet cartridge or pen 26 (FIG. 3). In another embodiment, ink supply assembly 14 is separate from inkjet printhead assembly 12 and supplies ink to inkjet printhead assembly 12 through an interface connection, such as a supply tube. In either embodiment, reservoir 15 of ink supply assembly 14 may be removed, replaced, and/or refilled.
Mounting assembly 16 supports inkjet printhead assembly 12 relative to print media transport assembly 18. Print media transport assembly 18 positions print medium 19 relative to inkjet printhead assembly 12. Thus, a print zone 17 is defined adjacent to nozzles 13 in an area between inkjet printhead assembly 12 and print medium 19. In one embodiment, inkjet printhead assembly 12 is a non-scanning or fixed printhead assembly. As such, mounting assembly 16 fixes inkjet printhead assembly 12 at a prescribed position relative to print media transport assembly 18. Thus, print media transport assembly 18 advances or positions print medium 19 relative to inkjet printhead assembly 12.
Service station assembly 20 includes at least one servicing component for wiping, capping, spitting, and/or priming of inkjet printhead assembly 12 in order to maintain functionality of inkjet printhead assembly 12 and, more specifically, nozzles 13, as will be further described below. Functions of service station assembly 20 rely on relative motion between service station assembly 20 and inkjet printhead assembly 12.
Electronic controller 22 communicates with inkjet printhead assembly 12, mounting assembly 16, print media transport assembly 18, and service station assembly 20. Electronic controller 22 receives data 23 from a host system, such as a computer, and includes memory for temporarily storing data 23. Typically, data 23 is sent to inkjet printing system 10 along an electronic, infrared, optical or other information transfer path. Data 23 represents, for example, a document and/or file to be printed. As such, data 23 forms a print job for inkjet printing system 10 and includes one or more print job commands and/or command parameters.
In one embodiment, electronic controller 22 provides control of inkjet printhead assembly 12 including timing control for ejection of ink drops from nozzles 13. As such, electronic controller 22 defines a pattern of ejected ink drops which form characters, symbols, and/or other graphics or images on print medium 19. Timing control and, therefore, the pattern of ejected ink drops is determined by the print job commands and/or command parameters.
In one embodiment, as illustrated in
In one embodiment, printhead mounting plate 50 includes a printhead aperture 52 and a clearance aperture 54 (FIGS. 3 and 11). Printhead aperture 52 receives printhead 24 such that printhead 24 extends through printhead aperture 52 towards print medium 19. Clearance aperture 54 is sized and shaped to receive service station assembly 20 such that service station assembly 20 may be selectively moved into and out of printhead mounting plate 50. Accordingly, service station assembly 20 is movably connected to printhead mounting plate 50, as will be further described below.
In one embodiment, as illustrated in
Servicing components 64 and 66 are positioned on servicing plate 62 such that each servicing component 64 and 66 interacts with or services printhead 24 when servicing plate 62 is in a corresponding service position. For example, servicing component 64 services printhead 24 when servicing plate 62 is in a first service position, and servicing component 66 services printhead 24 when servicing plate 62 is in a second service position. Notably, servicing plate 62 may support one servicing component or a number of servicing components, such as a wiper, a cap and a spring, and/or a spittoon, in a variety of different configurations and, therefore, may service printhead 24 from a variety of different service positions or combinations thereof.
In one embodiment, servicing component 64 may include a rubber blade or wiper 72. Wiper 72 is supported by servicing plate 62 and extends upwardly (with respect to the orientation of
In one embodiment, servicing component 66 may include a cap 74. Cap 74 is sized to cover a front face 25 of printhead 24 to seal and protect nozzles 13 (
As described above, drive system 60 moves servicing plate 62 relative to printhead mounting plate 50 and, therefore, printhead 24. In one embodiment, drive system 60 is connected to servicing plate 62 near trailing end 70 opposite of servicing components 64 and 66 such that drive system 60 does not interfere with the interaction between servicing components 64 and 66 and printhead 24.
In one embodiment, as illustrated in
In one embodiment, drive feature 84 is associated with printhead mounting plate 50 and drive element 82 is connected to servicing plate 62. Drive element 82 interacts with drive feature 84 to move servicing plate 62 relative to printhead mounting plate 50. More particularly, drive element 82 and drive feature 84 interact to guide servicing plate 62 and, therefore, service station 67 between a storage position, as illustrated in
In the storage position, servicing plate 62 is positioned in clearance aperture 54 and recessed at least partially within printhead mounting plate 50. Thus, service station assembly 20 does not interfere with the spacing between printhead 24 and print medium 19 during the printing process. In the service positions, servicing plate 62 is displaced from clearance aperture 54 and positioned between printhead mounting plate 50 and platen 40 to facilitate servicing of printhead 24 with servicing components 64 and 66.
In one embodiment, drive actuator 86 is coupled with printhead mounting plate 50 and drive block 80 to move drive block 80 and, therefore, servicing plate 62 as drive element 82 interacts with drive feature 84. More specifically, drive actuator 86 is secured to printhead mounting plate 50 such that actuation of drive actuator 86 generates movement of drive block 80 relative to printhead mounting plate 50. Alternatively, drive actuator 86 may be directly coupled with drive element 82, drive arm 88, or servicing plate 62, rather than drive block 80, to move servicing plate 62 relative to printhead 24. Drive actuator 86 may include a ballscrew, a leadscrew, an air cylinder, a hydraulic cylinder, or other actuation device.
In one embodiment, drive element 82 includes a cam follower 90 and drive feature 84 includes a cam slot 92. Cam follower 90 fits within and follows cam slot 92 to guide and move servicing plate 62 relative to printhead mounting plate 50. In one embodiment, cam slot 92 is formed in a sidewall of printhead mounting plate 50 and cam follower 90 includes a pin which fits into cam slot 92.
In one embodiment, cam slot 92 includes cam slot regions 94, 96, and 98. Cam slot regions 94, 96, and 98 define a single slot which forms cam surfaces which guide cam follower 90 and move servicing plate 62 between the storage position and the service positions. In one embodiment, cam slot region 94 is oriented at a non-parallel angle with respect to cam slot region 96 for moving servicing plate 62 from the storage position to a first service position. In addition, cam slot region 96 communicates with cam slot region 94 and extends between cam slot region 94 and cam slot region 98. Cam slot region 96 is oriented such that servicing plate 62 can move back and forth relative to printhead 24 to service printhead 24. Furthermore, cam slot region 98 communications with cam slot region 96 opposite of cam slot region 94 and is oriented at a non-parallel angle with respect to cam slot region 96 for moving servicing plate 62 to a second service position.
In one embodiment, cam slot region 94 is longer and extends further upwardly from cam slot region 96 than cam slot region 98. Thus, servicing plate 62 may be recessed within clearance aperture 54 of printhead mounting plate 50 when in the storage position. Notably, cam slot 92 may be formed in a number of configurations for supporting and guiding cam follower 90 and, consequently, servicing plate 62 in and between the storage position and one or more service positions.
In one embodiment, as illustrated in
In one embodiment, as illustrated in
In one embodiment, as illustrated in
Once printhead 24 is spaced from platen 40, as illustrated in
In one embodiment, as illustrated in
As illustrated in
Drive actuator 86 may also be actuated to impart return movement of servicing plate 62 from the second service position back to the first service position and from the first service position back to the storage position. Otherwise stated, drive actuator 86 may be actuated to move cam follower 90 down cam slot region 98, across cam slot region 96, and up cam slot region 94, thereby, returning servicing plate 62 to the storage position. Furthermore, servicing plate 62 may move from the first service position back to the storage position without moving to the second service position.
As illustrated in the embodiment of
As illustrated in the embodiment of
In one embodiment, as illustrated in
In one embodiment, as illustrated in
Service stations 67 are arranged to correspond with the arrangement of printheads 24 such that each service station 67 can service a corresponding printhead 24. For example, as illustrated in
Although specific embodiments have been illustrated and described herein for purposes of description of the preferred embodiment, it will be appreciated by those of ordinary skill in the art that a wide variety of alternate and/or equivalent implementations calculated to achieve the same purposes may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. Those with skill in the chemical, mechanical, electro-mechanical, electrical, and computer arts will readily appreciate that the present invention may be implemented in a very wide variety of embodiments. This application is intended to cover any adaptations or variations of the preferred embodiments discussed herein. Therefore, it is manifestly intended that this invention be limited only by the claims and the equivalents thereof.
This application is a Continuation of U.S. patent application Ser. No. 10/229,711 filed on Aug. 28, 2002 now U.S. Pat. No. 6,659,586 which claims priority to U.S. Provisional Patent Application Ser. No. 60/317,114, filed on Sep. 5, 2001, each incorporated herein by reference.
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Number | Date | Country | |
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20040061735 A1 | Apr 2004 | US |
Number | Date | Country | |
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60317114 | Sep 2001 | US |
Number | Date | Country | |
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Parent | 10229711 | Aug 2002 | US |
Child | 10676583 | US |