Patent Application
20060061619
Inkjet pens are often serviced by performing spitting to remove blockages. Servicing such pens during printing can be time consuming and may limit throughput.
The loader 104 may comprise any of a variety of suitable media handling devices configured to advance media from the media input 102 to the drum 106. For example, the loader 104 may comprise a pick roller (not shown), configured to pick media and advance the media through other rollers, belts, or both, to move the media from the media input 102 to the drum 106. The loader 104 is shown as operating under influence of a controller 120. The controller 120 controls the rotational speed of the drum and monitors the angular position of the drum 106. The controller 120 also controls advancement of media through the loader 104 and monitors the location or position of the media as the media passes through the loader 104. Thus, the loader 104, operating under control of the controller 120 may accurately position media on the drum 106. In some embodiments, the drum 106 includes a media region 122 at which a sheet 124 of media to be imaged is typically positioned. In some embodiments, the loader 104 may be configured in a manner similar to media handling devices that feed media to a platen from multiple media sources, such as different paper input trays.
The sheet 124 of media to be imaged is maintained on a surface 126 of the drum 106 during imaging. The sheet 124 of media to be imaged may be maintained at the surface 126 by suction force created by an optional vacuum source 130 and vacuum conduits 132. Alternatively, the sheet 124 may be maintained on the drum 106 by protrusions on the surface 126 (not shown). In other embodiments, the sheet 124 may be maintained on the drum 106 by electrostatic attraction or electrostatic hold down.
The sheet 124 may be unloaded from the drum 106 by the unloader 108. In some embodiments, the unloader 108 is configured to strip or otherwise separate the sheet 124 from the drum 106 and to then advance the sheet 124 to the media output 110. The unloader 108 may operate under control of the controller 120 to remove the sheet 124 from the drum 106 after the sheet 124 has been at least partially imaged by print engine 140 and to then route the sheet 124 to the media output 110. The unloader 108 may comprise a set of rollers, belts, diverters or the like for advancing the sheet 124 from the drum to the media output 110. In some embodiments, the unloader 108 may include protrusions (not shown), such as claws or fingers, that selectively extend to the surface of the drum to assist in separating the sheet 124 from the drum. These protrusions may be cam-driven and to move in accordance with the angular position of the drum.
The print engine 140 may comprise an inkjet print engine having one or more pens. Each pen may have one or more print heads. In some embodiments, different colors of ink may be present the different print heads. For example, the print engine 140 may comprise a page-wide array of print heads or may comprise one or more print heads configured to move during printing.
The drum 106 is also shown as including an absorber 164 disposed in a recess 166. The recess 164 may be formed in the surface 126 of the drum 106. In some embodiments, the recess 164 is elongated recess having a longitudinal axis parallel with the axis of rotation 168 of the drum 106. While the recess 166 may have a substantially rectangular cross-section, as shown in
The absorber 164 may comprise a foam, sponge, porous, fibrous, or other material suitable for absorbing, or maintaining, ink spit thereon by the print engine 140. In some embodiments, the absorber 164 is formed of an absorbent material that pulls ink spit thereon deep into the absorber by wicking.
The absorber 164 may be maintained in the recess 166 by grippers (not shown), by a light adhesive disposed between a bottom surface of the recess 166 and the absorber 164, by suction via the conduits 132, or other suitable manner. In embodiments where the absorber 164 is maintained in the recess 166 by suction, it may be satisfactory to rotate the drum to position the recess 166 at a top of the drum when power is off to prevent the absorber 164 from falling out of the recess 166.
In this configuration, the print engine 140 may perform a servicing operation, such as spitting, without moving away from the drum surface 126. Operating under control of the controller 120, the print engine 140 may spit ink onto the absorber 164. As discussed below, the absorber 164 may be periodically replaced with a clean absorber or an absorber having less ink thereon. In some embodiments, the replacement interval is chosen such that the absorber 164 is removed and replaced with another absorber before saturation of the absorber 164 with ink or after a predetermined amount of ink has been spit on the absorber 164.
The device 100 is shown as including a supply of absorbers 170. Each of the absorbers in the supply of absorbers 170 may be configured similar or identical to the absorber 164 disposed in the recess 166. The unloader 108 is configured to remove the absorber 164 from the recess 166 and to advance the absorber 170 to the absorber output 172. In this configuration, the same unloader 108 that removes the sheet 124 and advances the sheet to the media output 110 also removes the absorber 164 and advances the removed absorber 164 to the absorber output 172, which may comprise an output bin. The unloader 108 may be configured in a manner similar to other media handling devices that route media to different output bins based on signals received from a controller. In some embodiments, the controller 120 may reduce the rotational speed of the drum during loading and unloading the absorber 164.
Alternatively, the absorber 164 may be removed from the drum 106 by rotating the drum 106 such that the recess 166 is at or near a bottom portion of the drum (i.e., oriented at about −90 degrees from horizontal). With the drum 106 in this position, a receptacle 180 is positioned directly below, or in a direction of gravity, from the absorber 164 and recess 166. In this position, the absorber 164 may be removed from the drum 106 by force of gravity. Pursuant to an example embodiment, the controller 120 causes the drum 106 to position the recess 166 directly above the receptacle 180 and then decreases or terminates the suction applied to the recess 166 via the conduits 132. With the reduced suction, the force of gravity pulls the absorber 164 from the recess 166 into the receptacle 180. The absorber 164 falls into the receptacle 166 by gravity with the suction force reduced or terminated. Used absorbers 188 are shown as being disposed in the receptacle 180.
As such,
In embodiments where grippers maintain the absorber 164 in the recess 166, the grippers may be opened under control of the controller 120 to release the absorber 164 and to allow the absorber to fall into the receptacle 180. Alternatively, an actuator may be provided to push or otherwise advance the absorber 164 from the grip of the grippers so the absorber may fall into the receptacle 180.
In some embodiments, a technician or user may periodically or occasionally empty the absorbers output 172, the receptacle 180, or both, to prevent these from becoming too full. The technician or user may also restock or refill the supply of absorbers 170 with additional absorbers at this same or a similar interval.
The loader 204 may comprise any of a variety of suitable media handling devices configured to advance media from the media input 202 to the drum 206. The loader 204 is shown as operating under influence of a controller 220. The controller 220 controls the rotational speed of the drum 206 and monitors the angular position of the drum 206. The controller 220 also controls advancement of media through the loader 204 and monitors the location or position of the media as the media passes through the loader 204. Thus, the loader 204, operating under control of the controller 220 may accurately position media on the drum 206. In some embodiments, the drum 206 includes a media region 222 at which a sheet 224 of media to be imaged is typically positioned. The sheet 224 may be maintained on the drum 206 by suction, by protrusions (not shown) on surface 226, by electrostatic hold down, or other suitable technique.
The sheet 224 may be unloaded from the drum 206 by the unloader 208. In some embodiments, the unloader 208 is configured to strip or otherwise separate the sheet 224 from the drum 206 and to then advance the sheet 224 to the media output 210. The unloader 208 may operate under control of the controller 220 to remove the sheet 224 from the drum 206 after the sheet 224 has been at least partially imaged by print engine 240 and to then route the sheet 224 to the media output 210. The unloader 208 may comprise a set of rollers, belts, diverters or the like for advancing the sheet 224 from the drum to the media output 210. The print engine 240 may be configured in a manner similar or identical to the print engine 140 described above.
In some embodiments, the unloader 208 may include protrusions (not shown), such as claws or fingers, that selectively extend to the surface of the drum to assist in separating the sheet 224 from the drum. These protrusions may be cam-driven and to move in accordance with the angular position of the drum.
The drum 206 is also shown as including an absorber 264 disposed in a recess 266. The recess 264 may be formed in the surface 226 of the drum 206. In some embodiments, the recess 264 is an elongated recess having a longitudinal axis parallel with the axis of rotation 268 of the drum 206. While the recess 266 may have a rectangular cross-section, as shown in
The absorber 264 may be configured similar or identical to the absorber 164 described above. The absorber 264 may be suitable for absorbing, or maintaining, ink spit thereon by the print engine 240.
The absorber 264 may be maintained in the recess 266 by one or more grippers 275. The absorber 264 may be loaded into the grippers 275 manually in some embodiments. In other embodiments, the absorber 264 is loaded into the grippers 275 by feeder 277. The feeder 277 may be configured as a mechanical parts feeder and may comprise any suitable parts feeder, such as a pneumatic parts feeder, a solenoid driven parts feeder, a motor-driven parts feeder, a programmable parts feeder, or the like. The feeder 277 is configured to store absorbers 264 therein and to feed one or more of the stored absorbers 264 into the recess 266 under control of the controller 220.
In some embodiments, the grippers 275 operate under control of the controller 220 to move between open and closed positions to, respectively, release and retain the absorber 264 disposed in the recess 266. Pursuant to other embodiments, the grippers 275 do not operate under control of the controller 220, but rather comprise clips or retaining members and may passively retain the absorber 264 within the recess 266. In some embodiments, the grippers 275 maintain the absorber 264 within the recess 266 by spring force or other suitable force.
The feeder 277 may load one or more of the stored absorbers 264 into the recess by pushing one or more of the stored absorbers 264 into a tight, compression fit between the grippers 275. An actuator 281 may be positioned at the drum 206 and may operate under control of the controller 220. In some embodiments, the actuator 281 is configured to push the absorber 264 disposed in the recess 266 out of the recess 266, such that the absorber 264 may fall from the drum 206 into a receptacle 280. As such, it may be satisfactory for the actuator 281 to push the absorber 264 out of the recess 266 when the recess 266 is positioned directly above the receptacle 280 and at the bottom of the drum 206 so that the absorber 264 may fall unimpeded into the receptacle 280. Used absorbers 288 are shown as being disposed in the receptacle 280.
Pursuant to embodiments where the base 304 is substantially non-absorbent, the base 304 may limit or prevent substantial amounts of ink from passing from the absorbent member 302 onto the surfaces of the recess 166 or into the conduits 132. As such, a non-absorbent base 304 may substantially prevent the ink that has been spit onto the absorbent member 302 from leaking or otherwise passing onto drum structures.
In this embodiment, the actuator 281 may eject the absorber 364 from within the recess 266, or from the grasp of the grippers 275. The actuator 281 is optional, however, and is not present in some embodiments.
In some embodiments, the absorber 664 may be manually secured within the recess 656 and maintained in the recess 656 without use of suction force, adhesion, or grippers. Instead, the absorber 664 is held in the recess 656 by virtue of the interlocking or engaging respective geometries of the absorber 664 and recess 656.
Although the foregoing has been described with reference to exemplary embodiments, those skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope thereof. For example, although different exemplary embodiments may have been described as including one or more features providing one or more benefits, it is contemplated that the described features may be interchanged with one another or alternatively be combined with one another in the described exemplary embodiments or in other alternative embodiments. The present inventions described with reference to the exemplary embodiments and set forth in the following claims are manifestly intended to be as broad as possible. For example, unless specifically otherwise noted, the claims reciting a single particular element also encompass a plurality of such particular elements.
