BACKGROUND
Image forming apparatuses such as large format printers may include fluid applicator units to provide fluid such as ink on substrates. The image forming apparatuses may include diverters to transport substrates to and from the fluid applicator units along a transport path.
BRIEF DESCRIPTION OF THE DRAWINGS
Non-limiting examples are described in the following description, read with reference to the figures attached hereto and do not limit the scope of the claims. Dimensions of components and features illustrated in the figures are chosen primarily for convenience and clarity of presentation and are not necessarily to scale. Referring to the attached figures:
FIG. 1 is a block diagram illustrating an image forming system according to an example.
FIG. 2 is a side view illustrating a portion of the image forming system of FIG. 1 according to an example.
FIG. 3A is a perspective view illustrating a diverter assembly of the image forming system of FIG. 1 according to an example.
FIG. 3B is a front view illustrating the diverter assembly of FIG. 3A according to an example.
FIG. 4 is a block diagram illustrating a diverter assembly usable with an image forming system according to an example.
FIG. 5 is a perspective view illustrating the diverter assembly of FIG. 4 according to an example.
FIG. 6 is a block diagram illustrating the diverter assembly of FIG. 4 according to an example.
DETAILED DESCRIPTION
Image forming systems such as large format printers may include fluid applicator units to eject fluid such as ink on substrates. The respective image forming system may include a diverter such as a continuous idle roller to transport a substrate to and from the fluid applicator unit along a transport path. The diverter may change the direction of the respective substrate. The diverter in a form of a continuous idle roller, however, may cause undesired collateral effects such as substrate advance issues, wrinkles, temperature variations, and skew convergence to the substrate as it is bent and changes direction. Such undesired collateral effects may result in image quality defects, lower output productivity, and/or increase fluid applicator unit failures.
In examples, an image forming system includes, amongst other things, at least one diverter assembly to transport a substrate along a transport path. The diverter assembly may include a plurality of sets of idle rollers and at least one roller support member. Each set of idle rollers may include a longitudinal axis and a plurality of respective idle rollers disposed along the respective longitudinal axis. Each idle roller of adjacent sets of idle rollers may be in a staggered arrangement with each other. The at least one roller support member may rotatably support the respective sets of idle rollers. Additionally, the plurality of sets of idle rollers may be in a circumferential arrangement with each other. Accordingly, the diverter assembly using the plurality of staggered and circumferentially arranged idle rollers to reduce undesired collateral effects such as substrate advance issues, wrinkles, temperature variations, and skew convergence to the substrate by creating a rolling surface that reduces friction between the substrate and diverter assembly as compared to the single continuous idle roller. Consequently, image quality defects, lower output productivity, and/or increase fluid applicator unit failures may be reduced.
FIG. 1 is block diagram illustrating an image forming system according to an example. FIG. 2 is a side view illustrating a portion of the image forming system of FIG. 1 according to an example. Referring to FIGS. 1 and 2, in some examples, an image forming system 100 includes a fluid applicator unit 10, a main support member 11, and at least one diverter assembly 110. The fluid applicator unit 10 may form an image on a substrate S. For example, in some examples, the fluid applicator unit 10 may include at least one inkjet print head to eject ink in the form of drops. For example, the fluid applicator unit 10 may be a page wide inkjet print head array that includes a plurality of inkjet print heads that extend across a width of a transport path Pt. That is, the plurality of inkjet print heads may extend across a width of a substrate S passing into a print zone.
In some examples, the image forming system 100 may include a plurality of diverter assemblies 110, a plurality of main support members 11, a plurality of roller support members 15 formed of sheet metal, and each one of the idle rollers may be formed of plastic. In some examples, the respective idle rollers may include a low friction surface, a smooth surface, low thermal conduction, and low moment of inertia. For example, the coefficient of friction may be in a range of about 0.03 to 0.1 of the respective idle rollers against steel. The low thermal conduction may be less than 0.3 watts per meter Kelvin (W/(m·K)), and the low moment of inertia may be less than 2·10−6 kg·m2 for each idle roller.
Referring to FIGS. 1 and 2, the diverter assembly 110 may transport a substrate S along a transport path Pt. The diverter assembly 110 may include a plurality of sets of idle rollers 12 and at least one roller support member 15. Each set of idle rollers 22a, 22b, 22c, 22d, and 22e may include a respective longitudinal axis 23a, 23b, 23c, 23d, and 23e and a plurality of respective idle rollers 14 disposed along the respective longitudinal axis 23a, 23b, 23c, 23d, and 23e. Each idle roller of adjacent sets of idle rollers may be in a staggered arrangement with each other. The at least one roller support member 15 may support the respective sets of idle rollers 22a, 22b, 22c, 22d, and 22e and may couple a respective idle roller to the main support member 11. For example, the at least one roller support member 15 may rotatably support the respective sets of idle rollers 22a, 22b, 22c, 22d, and 22e to enable them to rotate about their respective longitudinal axes.
Referring to FIG. 2, in some examples, the diverter assembly 110 may include a single roller support member 15. Alternatively, the diverter assembly 110 may include a plurality of roller support members 15. The plurality of sets of idle rollers 22a, 22b, 22c, 22d, and 22e may be in a circumferential arrangement with each other. For example, each one of the idle rollers may be equidistant de from a reference longitudinal axis ar of a reference cylinder and be disposed along a circumference cr of the reference cylinder as illustrated in FIG. 2. That is, each one of a respective longitudinal axis 23a, 23b, 23c, 23d, and 23e of the corresponding set of idle rollers 22a, 22b, 22c, 22d, and 22e may be spaced apart from the reference longitudinal axis ar of the reference cylinder by a distance de.
FIG. 3A is a perspective view illustrating a diverter assembly of the image forming system of FIG. 1 according to an example. FIG. 3B is a front view illustrating a diverter assembly of the image forming system of FIG. 3B according to an example. Referring to FIGS. 3A and 3B, in some examples, the plurality of sets of idle rollers 12 includes at least three sets of idle rollers 22a, 22b, and 22c. For example, the plurality of sets of idle rollers 12 may include five sets of idle rollers 22a, 22b, 22c, 22d, and 22e. In some examples, each one of the plurality of sets of idle rollers 22a, 22b, 22c, 22d, and 22e includes at least three idle rollers 24a1, 24a2, 24a3, 24b1, 24b2, 24b3, 24c1, 24c2, 24c3, 24d1, 24d2, 24d3, 24e1, 24e2, and 24e3. For example, each one of the plurality of sets of idle rollers 22a, 22b, 22c, 22d, and 22e may include five idle rollers 24a1, 24a2, 24a3, 24a4, 24a5, . . . , 24e1, 24e2, 24e3, 24e4, and 24e5.
In some examples, a distance of space ds between adjacent idle rollers 24a1 and 24a2 along a corresponding longitudinal axis 23a is smaller than a longitudinal length ll of the respective adjacent idle rollers 24a1 and 24a2. Additionally, each idle roller 24a1, 24a2, 24a3, 24a4, 24a5, 24b1, 24b2, 24b3, 24b4, and 24b5 of adjacent sets of idle rollers 22a and 22b may be in a staggered arrangement with each other. For example, idle roller 24b2 may be disposed below and overlap a portion of idle rollers 24a1 and 24a2. In some examples, the respective idle rollers 24a1, 24a2, 24a3, 24a4, 24a5, . . . , 24e1, 24e2, 24e3, 24e4, and 24e5 may be disposed in a quincunx arrangement. For example, a quincunx arrangement may correspond to a fully staggered formation. Referring to FIGS. 3A and 3B, in some examples, each one 24a1, 24a2, 24a3, 24a4, 24a5, . . . , 24e1, 24e2, 24e3, 24e4, and 24e5 of the idle rollers of the plurality of idle rollers 14 may be substantially a same size. In some examples, each one 24a1, 24a2, 24a3, 24a4, 24a5, . . . , 24e1, 24e2, 24e3, 24e4, and 24e5 of the idle rollers may have tapered ends et.
FIG. 4 is a block diagram illustrating a diverter assembly according to an example. FIG. 5 is a perspective view illustrating a diverter assembly of FIG. 4 according to an example. Referring to FIGS. 4 and 5, in some examples, a diverter assembly 410 may transport a substrate along a transport path and be usable with an image forming system. The diverter assembly 410 may include a first set of idle rollers 42a, a second set of idle rollers 42b, a third set of idle rollers 42c, and at least one roller support member 45. The first set of idle rollers 42a may be disposed along a first longitudinal axis 43a and spaced apart from each other. The second set of idle rollers 42b may be disposed along a second longitudinal axis 43b and spaced apart from each other. Each one 44b1, 44b2, 44b3, 44b4, and 44b5 of the second set of idle rollers 42b may be in a staggered arrangement with each one 44a1, 44a2, 44a3, 44a4, and 44a5 of the respective idle rollers of the first set of idle rollers 42a and each one 44c1, 44c2, 44c3, 44c4, and 44c5 of the respective idle rollers of the third set of idle rollers 42c.
Referring to FIGS. 4 and 5, in some examples, each one 44a1, 44a2, 44a3, 44a4, 44a5, . . . , 44e1, 44e2, 44e3, 44e4, and 44e5 of the idle rollers may be formed of plastic. The at least one roller support member 45 may support the first, second, and third set of idle rollers 42a, 42b, and 42c. For example, the at least one roller support member 45 may rotatably support the respective sets of idle rollers 42a, 42b, and 42c to enable them to rotate about their respective longitudinal axes. The first, second, and third set of idle rollers 42a, 42b, and 42c may be in a circumferential arrangement with each other. In some examples, each one of the first, second, and third set of idle rollers 42a, 42b, and 42c may include at least three idle rollers 44a1, 44a2, 44a3, 44b1, 44b2, 44b3, 44c1, 44c2, and 44c3. For example, each one of the first, second, and third sets of idle rollers 42a, 42b, and 42c may include five idle rollers 44a1, 44a2, 44a3, 44a4, 44a5, 44b1, 44b2, 44b3, 44b4, 44b5, 44c1, 44c2, 44c3, 44c4, and 44c5. Additionally, each one 44a1, 44a2, 44a3, 44a4, 44a5, 44b1, 44b2, 44b3, 44b4, 44b5, 44c1, 44c2, 44c3, 44c4, and 44c5 of the idle rollers of the first, second, and third sets of idle rollers 42a, 42b, 42c may be substantially a same size.
Referring to FIGS. 4 and 5, in some examples, the diverter assembly 410 may also include a fourth set of idle rollers 42d and a fifth set of idle rollers 42e. The fourth set of idle rollers 42d may be disposed along a fourth longitudinal axis 43d and spaced apart from each other. Each one 44d1, 44d2, 44d3, 44d4, and 44d5 of the respective idle rollers of the fourth set of idle rollers 43d may be in a staggered arrangement with each one 44c1, 44c2, 44c3, 44c4, and 44c5 of the respective idle rollers of the third set of idle rollers 42c and each one 44e1, 44e2, 44e3, 44e4, and 44e5 of the respective idle rollers of the fifth set of idle rollers 42e. The fifth set of idle rollers 42e may be disposed along a fifth longitudinal axis 43e and spaced apart from each other. The first, second, third, fourth and fifth sets of idle rollers 42a, 42b, 42c, 42d, and 42e may be in a circumferential arrangement with each other and are supported by the at least one roller support member 45.
Referring to FIGS. 4 and 5, for example, each one 44a1, 44a2, 44a3, 44a4, 44a5, . . . , 44e1, 44e2, 44e3, 44e4, and 44e5 of the idle rollers is equidistant de from a reference longitudinal axis ar. In some examples, a distance of space ds between adjacent idle rollers 44a1 and 44a2 along a corresponding longitudinal axis 43a is smaller than a longitudinal length ll of the respective adjacent idle rollers 44a1 and 44a2. In some examples, the respective idle rollers 44a1, 44a2, 44a3, 44a4, 44a5, . . . , 44e1, 44e2, 44e3, 44e4, and 44e5 may be disposed in a quincunx arrangement.
FIG. 6 is a block diagram illustrating the diverter assembly of FIG. 4 according to an example. Referring to FIG. 6, in some examples, a diverter assembly 410 may transport a substrate along a transport path and be usable with an image forming system. The diverter assembly 410 may include a first set of idle rollers 42a, a second set of idle rollers 42b, a third set of idle rollers 42c, a fourth set of idle rollers 42d, a fifth set of idle rollers 42e, and at least one roller support member 45. The first set of idle rollers 42a may be disposed along a first longitudinal axis 43a and spaced apart from each other. The second set of idle rollers 42b may be disposed along a second longitudinal axis 43b and spaced apart from each other. Each one 44b1, 44b2, 44b3, 44b4, and 44b5 of the second set of idle rollers 42b is in a staggered arrangement with each one 44a1, 44a2, 44a3, 44a4, and 44a5 of the respective idle rollers of the first set of idle rollers 42a and each one 44c1, 44c2, 44c3, 44c4, and 44c5 of the respective rollers of the third set of idle rollers 42c.
Referring to FIG. 6, in some examples, the fourth set of idle rollers 42d may be disposed along a fourth longitudinal axis 43d and spaced apart from each other. Each one of the fourth set of idle rollers 42d may be in a staggered arrangement with each one of the respective idle rollers of the third set of idle rollers 42c and each one of the respective idle rollers of the fifth set of idle rollers 42e. The fifth set of idle rollers 42e may be disposed along a fifth longitudinal axis 43e and spaced apart from each other. The first, second, third, fourth and fifth sets of idle rollers 42a, 42b, 42c, 42d, and 42e may be in a circumferential arrangement with each other and are supported by the at least one roller support member 45. For example, each one of the idle rollers is equidistant de from a reference longitudinal axis ar. In some examples, a distance of space ds between adjacent idle rollers along a corresponding longitudinal axis is smaller than a longitudinal length ll of the respective adjacent idle rollers.
The present disclosure has been described using non-limiting detailed descriptions of examples thereof that are not intended to limit the scope of the general inventive concept. It should be understood that features and/or operations described with respect to one example may be used with other examples and that not all examples have all of the features and/or operations illustrated in a particular figure or described with respect to one of the examples. Variations of examples described will occur to persons of the art. Furthermore, the terms “comprise,” “include,” “have” and their conjugates, shall mean, when used in the disclosure and/or claims, “including but not necessarily limited to.”
It is noted that some of the above described examples may include structure, acts or details of structures and acts that may not be essential to the general inventive concept and which are described for illustrative purposes. Structure and acts described herein are replaceable by equivalents, which perform the same function, even if the structure or acts are different, as known in the art. Therefore, the scope of the general inventive concept is limited only by the elements and limitations as used in the claims.
Patent Grant
9327517
