Tensioned belts are sometimes employed to transfer rotational power from a rotating shaft to another object, such as an item coupled to the belt or to a pulley. Having a high belt tension may be problematic in that the high belt tension may lead to motor heating and rapid wear of motor bushings for the motor driving the rotating shaft. Having a low belt tension may also be problematic in that slipping may occur between the belt and the shaft or pulley.
Ink supply assembly 104 supplies ink to printhead assembly 102 and includes a reservoir 130 for storing ink. As such, ink flows from reservoir 130 to inkjet printhead assembly 102. In some embodiments, inkjet printhead assembly 102 and ink supply assembly 104 are housed together in an inkjet print cartridge or pen as defined by dashed line 140. In other embodiments, ink supply assembly 104 and/or reservoir 130 are separate from ink printhead assembly 102 and supply ink to inkjet printhead assembly 102 from an off-axis position. In some embodiments, the reservoir 130 of ink supply assembly 104 may be removed, replaced, and/or refilled.
Carriage assembly 106 positions inkjet printhead assembly 102 relative to media transport assembly 108, and media transport assembly 108 positions print medium 126 relative to the inkjet printhead assembly 102. Thus, a print zone 132 is defined adjacent to nozzles 122 in an area between inkjet printhead assembly 102 and print medium 126. In a scanning-type printing system, carriage assembly 106 moves inkjet printhead assembly 102 relative to media transport assembly 108 to scan print medium 126. As such, carriage assembly 106 includes a carriage and a carriage drive assembly, as described below. Thus, in some embodiments, the entire print cartridge 140 is positioned in and supported by the carriage and the carriage drive assembly moves print cartridge 140, including inkjet printhead assembly 102, back and forth across print medium 126. In other embodiments, the printhead assembly 102 is positioned in and supported by the carriage while the ink supply assembly 104 and reservoir 130 are not carried by the carriage.
Electronic controller 120 communicates with the inkjet printhead assembly 102, carriage assembly 106, and media transport assembly 108. Electronic controller 120 receives data 122 from a host system, such as a computer, and may include a memory for temporarily storing data 122. Data 122 represents, for example, a document and/or file to be printed. As such, data 122 forms a print job for inkjet printing system 100 and may include one or more print job commands and/or command parameters.
Electronic controller 122 provides control of inkjet printhead assembly 102 including timing control for ejection of ink drops from nozzles 122. Electronic controller 122 also provides control of carriage assembly 106 including timing and a direction of movement relative to print medium 126. As such, electronic controller 120 defines a pattern of ejected ink drops which form characters, symbols, and/or other graphics or images on print medium 126.
The belt 210 comprises an elongated flexible member and, in some embodiments, comprises a timing belt. In the embodiment shown in
The belt 210 may be formed any of a variety of suitable materials, including, for example, a nylon fabric. In some embodiments, the belt 210 does not significantly stretch axially under loads common to the assembly 200.
The carriage 202 is shown as being adapted to carry and support a printhead assembly 222 therein. The printhead assembly 222 may be configured and may operate in a manner similar to the printhead assembly 102 described above.
The tensioning members 226, 228 serve to tension the belt 210 and to filter vibrations from the belt 210, according to some embodiments. Pursuant to some embodiments, vibrations, such as those that may originate at the motor may be transferred to the belt 210 via the shaft 208 and the pulley 204. The tensioning members 226, 228, in some of these embodiments may serve to at least partially reduce, or dampen, these vibrations such that these vibrations have less effect on the carriage 202 and printhead assembly 222.
In the configuration shown in
The tensioning members 226, 228 may be coupled to the carriage 202 by any of a variety of suitable ways. For example, in some embodiments the tensioning members 226, 228 may be coupled to the carriage 202 by coupling an end of each of the tensioning members 226, 228 to the carriage 202 by a suitable respective fastener (not shown). Clips, adhesives, or other coupling members or materials may alternatively be used to couple the tensioning members 226, 228 to the carriage 202.
Similarly, the tensioning members 226, 228 may be coupled to the belt 210 by any of a variety of suitable ways. The tensioning members 226, 228 may be coupled to the belt 210 at or adjacent the ends 216, 218. In some embodiments, the tensioning members 226, 228 are coupled to the ends 216, 218 of the belt 210. Further, as shown in
In an example inkjet printing implementation, the carriage 202 may have a mass in the range of about 20 grams to 1 kilogram and may nominally have a mass of about 90 grams. Moreover, in this example embodiment, the tensioning members 226, 228 may have a spring constant rate of about 0.75 Newton/mm. The spring constant rate may be in the range of about 0.1 to 7.5 Newton/mm in other inkjet printing embodiments. Further, the belt 210 may have a tension of about 2.5 Newtons. In other inkjet printing embodiments, the belt 210 may have a tension in the range of about 1 to 25 Newtons. Linear acceleration of the carriage 202 may be about 1.2 g in this example embodiment. In other inkjet printing embodiments, the linear acceleration of the carriage may be in the range of about 0.5 to 5.0 g. It should be understood that embodiments of the present subject matter may be outside these example ranges. These ranges are provided by way of example and are non-limiting. Further, embodiments of the present subject matter may be used in applications other than inkjet printing.
Although the present disclosure has been described with reference to example embodiments, workers 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 example 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 example embodiments or in other alternative embodiments. The present subject matter described with reference to the example embodiments and set forth in the following claims is manifestly intended to be broad. For example, unless specifically otherwise noted, the claims reciting a single particular element also encompass a plurality of such particular elements.