Patent Grant
7300136
The present embodiments relate generally a manner of providing stabilization to a printhead carrier assembly or other linear guides.
In many ink jet printers, sealed ink jet cartridges containing a fixed supply of ink are utilized. The cartridges are passed over the paper, and ink is ejected from the cartridge to form the image. When the ink in a particular cartridge has been depleted, the cartridge is replaced. To maximize printhead use, some printers incorporate separate stationary large volume ink supplies, and the ink in these supplies is routed via tubing from the external supply to the print cartridges. Examples of systems of this type are described in U.S. Pat. Nos. 5,686,947 and 6,637,864. The disclosures of these patents are hereby incorporated by reference in its entirety.
Print quality is highly dependent on accurate ink droplet placement on the media. Accordingly, any deviations in printhead position during printing (other than the desired printhead scanning motion across the media) can result in inaccurate drop placement and/or size, and thus reduce image quality.
One source of printhead position variation can arise from the ink supply tubing that is connected to the moving carriage that holds the ink jet cartridges. External forces from the ink supply tubing can be transmitted to the carriage, causing vibrations and other positional deviations of the cartridges as they pass over the media. In some printer embodiments, the weight of the ink supply tubing that is supported by the carriage varies with carriage position from one side of the printer to the other. In these cases, the carriage can be forced to rock backward and forward around its support shaft as the weight of the tubing increases and decreases during passes over the media. Since this positional deviation is consistent with carriage location during a scan, print errors caused by this problem appear as visible vertical banding in the printed image.
Currently, printhead carrier assemblies for printers have bushings that run on two shafts or bushings that run on a single shaft with sliders that prevent rotation of the assembly and possibly a subassembly running on a surface. In current designs, the slider is made from a low friction material, such as plastic in order to minimize friction.
Previous printers have attempted solve the vibration problem by using a plastic slider. The plastic slider is not an ideal solution because the slider is susceptible to defects on the surface of the part the slider is sliding against.
A device for use in an ink jet printer to mitigate friction caused by the weight of a carriage includes a slider and a pin. The slider includes a rigid substrate that has two sides connected at an angle between 80 degrees and 100 degrees. A hole is located in one of the sides of the substrate. The slider includes a fabric with extended fibers secured to the side that does include the hole. The fabric rests against a rear support wall of the inkjet printer and resists static charge accumulations. The pin is secured to the carriage and engages the hole. The pin allows the slider to rotate up to 360 degrees around the pin.
In the detailed description of the preferred embodiments presented below, reference is made to the accompanying drawings, in which:
The present embodiments are detailed below with reference to the listed Figures.
Before explaining the present embodiments in detail, it is to be understood that the embodiments are not limited to the particular descriptions and that it can be practiced or carried out in various ways.
Embodied herein is a slider that utilizes a fabric with extended fibers, such as a closed loop fabric and does not transmit a perturbation to the carriage caused by an anomaly within typical defect dimensions on the surface that the slider is riding on. The present embodiments provide the advantage of print quality greater than those found in the current art, wherein the print quality is not adversely affected by these defects, particularly vibration defects.
The embodied closed loop fabric cleans the surface that the slider is riding on, thereby keeping contamination out the path of the slider. The contamination particles are “swept” to either end using the embodied closed loop fabric version. The interface has improved resistance to effects of contamination.
The present embodiments were designed to limit service calls, thereby saving energy due to repeated service call visits. Using the present embodiments, parts of the ink jet system last longer, thereby significantly reducing maintenance and reducing waste. Using these present embodiments, ink jet system parts can now last up to a year and beyond as determined through numerous servo cycle tests.
The most preferred embodiment contemplates simply using a closed loop fabric, like Velcro™, and attaching the fabric to a component of an ink jet printing system that slides against a support wall. The Velcro™ or similar closed loop fabric reduces static charge and removes the contaminants along the wall.
The present embodiments relate to using other types of fabric with extended somewhat shaped fibers that extend above the surface of the fabric, in a manner similar to miniature toothbrush. This embodiment provides a cleaning function without the build up of static charge.
Besides the embodiment of simply adhering, the closed loop fabric can adhere to a surface of the carriage with a pressure sensitive adhesive, such as a 3M adhesive. Typically, the closed loop fabric adheres to the carriage either on the upper component or a lower component that engages a surface. The closed loop fabric can adhere to a simple substrate that is then attached to the carriage component. The substrate provides additional support to the fabric that ensures better cleaning. Many different carriages can be retrofitted to utilize the embodied cleaning aids in order to improve print quality. In the fabric plus substrate only embodiment, the substrate can adhere to the carriage with a pressure sensitive adhesive, in the same manner as the fabric is adhered to the substrate. An epoxy can be used to adhere the fabric to the carriage or substrate.
The embodied closed loop fiber provides a low friction coefficient when contacting the surface is sliding against. The low friction coefficient allows the carriage to travel more smoothly and yield a higher, better print quality than prior printing systems. The fabric with extended fiber embodiment is selected to reduce the build up of static or other ionic charges. Additionally, stick slip is reduced and, in some cases, eliminated with the slider using the fabric with extended fibers.
In still another embodiment, the fabric with closed loop or extended fibers can be mounted to a substrate, which is of a rectangular shape. A hole is formed in the substrate and a pin is inserted through the substrate so that the assemblage, referred to herein as a “slider”, can then rotate about the pin while cleaning during the movement of a carriage component.
In still another embodiment, the slider can be a substrate with a pin extending from a first side that engages the carriage of the ink jet printing system. The fabric with closed loop fiber is adhered to the second side of the substrate, opposite the first side. This embodiment allows some rotation of the slider and permits better flexibility when contamination is encountered.
Due to the flexibility of the fibers, the embodied slider can be used in either a free state with the weight of the assembly determining the position of the slider or in a fixed state with compression of the material against the surface the fabric is sliding against.
The embodied slider is particularly designed for use with ink jet printing systems; however, the slider can be used in other systems where the system requires a first part to slide against a second part. The embodied slider reduces defects in the results produced by the other system that occur when defects are present in the surface against which the parts are sliding. An example of another system where the embodied sliders are usable is a laser machining system. In a laser machining system, the lasers are mounted on a sliding carriage for cutting of material. The embodied devices can work well in photocopiers, other printing systems, such as for banners on film, and other types of printers, such as piezo printing systems.
For the ink jet printing system version, an ink jet printer includes a carriage mounted on a guide. U.S. Pat. No. 6,637,864, issued to one of the same inventors herein and hereby incorporated by reference, is an example of a typical ink jet printer.
The carriage is adapted to provide a transverse movement to the direction of print media in the printing system. The carriage in this embodiment includes an upper carriage component and a lower carriage component. The upper carriage component has a side adjacent to the rear support wall of the ink jet printer. The lower carriage component is mounted to the upper carriage component and supports the printhead. The present embodiments can be used in a single carriage design.
A slider is installed in this ink jet printer to mitigate friction caused by the weight of the carriage portion, which includes upper and lower components.
In another embodiment of the slider, a substrate with fabric disposed thereon includes a hole in the fabric. A pin is inserted in the hole around which the substrate and fabric combination rotate. The pin can be an integral protrusion of the upper carriage component or an independent part that slides through the hold.
The slider is preferably located between the upper carriage component and the rear support wall. The slider in the most preferred embodiment is simply a rigid substrate over which a fabric with extended fibers, or closed loop fibers is disposed.
In another embodiment, the slider is formed with an L-shaped substrate, wherein two portions of the substrate form the walls are connected at an angle between 80 degrees to about 100 degrees. The preferred angle is 90 degrees. The rigid substrate portions forming the L-shape can be composed of the same material or different materials.
A hole is located in the slider. The hole can be centered in the substrate on a side. The hole diameter can range from about 1/16 inch to about ½ inch. The hole can be in an end portion of the substrate and does not have to be centered. In the side embodiment, the hole can be formed in the substrate in order to appear as an eyelet connected to the side of the slider. The eyelet thereby forms the hole.
The rigid substrate can be made of a metal, alloys of metal, a coated metal, a rigid plastic, or combinations thereof. If a metal is used, the preferred metals are aluminum or zinc. Preferably, the rigid substrate is a durable material that is resistant to wear. If the rigid substrate is a rigid plastic, the preferred plastics are polycarbonate polymer, copolymer thereof, acrylic butyl styrene (ABS), and combinations thereof.
The rigid substrate typically has a thickness ranging from about 0.05 inches to about 0.2 inches. The preferred thickness is about 0.1 inches. The rigid substrate has an overall length ranging from about one inch to about three inches, preferably about 2 inches.
The slider includes a fabric with extended fibers secured to the side of the rigid substrate and rests against a rear support wall of the inkjet printer, as depicted in
The pin used in the embodiments is secured to the carriage and engages the hole. The pin allows the slider to rotate up to 360 degrees around the pin. Preferably, the pin has a smaller diameter than the diameter of the hole or hole formed from the eyelet. The pin can be a molded feature integrally formed by material of the carriage or the pin can be threaded into the carriage when the carriage includes a threaded unit. The pin can be formed by material similar or different from the carriage, but in either case, the pin can be molded into the carriage.
With reference to the figures,
As depicted in
The invention has been described in detail with particular reference to certain preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5686947 | Murray et al. | Nov 1997 | A |
| 6637864 | Dewey et al. | Oct 2003 | B2 |
| Number | Date | Country |
|---|---|---|
| 08324055 | Dec 1996 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20060146089 A1 | Jul 2006 | US |
