Capping device for hand-held printer

Abstract

A handheld inkjet printer is disclosed. The printer has a housing, a printhead fixedly mounted in the housing, and a capping device mounted external to the housing. The capping device has an arm, a capping leg extending transversely from the arm and an elastomeric pad affixed to the capping leg and in capping engagement with the printhead. The arm has a resilient portion deformable towards the housing upon receipt of a force. The housing defines a fulcrum with the arm and the leg being positioned on opposite sides of the fulcrum. Deformation of the arm towards the housing causes displacement of the capping leg, which in turn causes the elastomeric pad to move out of capping engagement with the printhead.

Description

FIELD OF THE INVENTION

The following invention relates to improvements in portable printer technology. More particularly, though not exclusively, the invention relates to a capping device for a hand-held drop-on-demand printer having a fixed printhead for ejecting droplets of ink onto a sheet of print media external to the printer.

BACKGROUND

Prior art drop-on-demand printers incorporate a supply of print media and employ a print media feed mechanism to transport the print media past the printhead or printheads to effect printing onto the print media. An application entitled “Manually Moveable Printer with Speed Sensor” discloses a portable, hand-held drop-on-demand inkjet printer having a fixed printhead. The printer can print an image onto a sheet external to the printer by passing the casing of the printer over and across the print media as the nozzles of the printhead eject ink.

During non-use periods of the printer, a capping device seals the printhead from the surrounding atmosphere to prevent evaporation of ink and the consequential blockage of the nozzles.

The present application is directed to specific capping arrangements for portable printers.

RELATED PATENT APPLICATIONS AND PATENTS

6566858	6331946	6246970	6442525	PCT/AU01/00141
7685423	PCT/AU01/00139	6816968	6757832	PCT/AU01/00140
PCT/AU00/00741	6238044	PCT/AU00/00742	6425661	6227652
6213588	6213589	6231163	6247795	6394581
6244691	6257704	6416168	6220694	6257705
6247794	6234610	6247793	6264306	6241342
6247792	6264307	6254220	6234611	6302528
6283582	6239821	6338547	6247796	6557977
6390603	6362843	6293653	6312107	6227653
6234609	6238040	6188415	6227654	6209989
6247791	6336710	6217153	6416167	6243113
6283581	6247790	6260953	6267469	6273544
6309048	6420196	6443558	6439689	6378989
6848181	6634735	PCT/AU98/00550	PCT/AU00/00095	6390605
6322195	6612110	6480089	6460778	6305788
PCT/AU00/00172	6426014	PCT/AU00/00338	6364453	PCT/AU00/00339
6457795	PCT/AU00/00581	6315399	PCT/AU00/00580	6338548
PCT/AU00/00582	6540319	PCT/AU00/00587	6328431	PCT/AU00/00588
6328425	PCT/AU00/00589	6991320	PCT/AU00/00341	6595624
PCT/AU00/00340	PCT/AU00/00749	6417757	PCT/AU01/01332	7095309
PCT/AU01/01318	6854825	PCT/AU00/00750	7075677	PCT/AU00/00751
6428139	PCT/AU00/00752	6575549	PCT/AU01/00502	PCT/AU00/00583
6383833	PCT/AU02/01120	PCT/AU00/00593	6464332	PCT/AU00/00333
PCT/AU00/01513	6428142	PCT/AU00/00590	6390591	PCT/AU00/00591
7018016	PCT/AU00/00592	6328417	PCT/AU00/00584	6322194
PCT/AU00/00585	6382779	PCT/AU00/00586	6629745	PCT/AU00/01514
6565193	PCT/AU00/01515	6609786	PCT/AU00/01516	6609787
PCT/AU00/01517	6439908	PCT/AU00/01512	6684503	PCT/AU00/00753
6755513	PCT/AU00/00594	6409323	PCT/AU00/00595	6281912
PCT/AU00/00596	6604810	PCT/AU00/00597	6318920	PCT/AU00/00598
6488422	PCT/AU01/01321	6655786	PCT/AU01/01322	6457810
PCT/AU01/01323	6485135	PCT/AU00/00516	6795215	PCT/AU00/00517
7154638	PCT/AU00/00511	6859289	PCT/AU00/00754	6977751
PCT/AU00/00755	6398332	PCT/AU00/00756	6394573	PCT/AU00/00757
6622923

DISCLOSURE OF THE INVENTION

According to an aspect of the present invention there is provided handheld inkjet printer comprising:

• • a housing;
  • a printhead fixedly mounted in the housing; and
  • a capping device mounted external to the housing, the capping device comprising an arm, a capping leg extending transversely from the arm and an elastomeric pad affixed to the capping leg and in capping engagement with the printhead, the arm having a resilient portion deformable towards the housing upon receipt of a force, the housing defining a fulcrum with the arm and the leg being positioned on opposite sides of the fulcrum, wherein deformation of the arm towards the housing causes displacement of the capping leg away from the housing and displacement of the elastomeric pad out of capping engagement with the printhead.

Other aspects are also provided.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred forms of the present invention will now be described by way of example only with reference to the accompanying drawings wherein:

FIG. 1 is a schematic cross-sectional end elevational view of a portable printer showing a first capping device in a capped position;

FIG. 2 is a schematic cross-sectional end elevational view of the portable printer of FIG. 1 with the first capping device shown in an uncapped position;

FIG. 3 is a schematic cross-sectional end elevational view of a portable printer having a second type of capping device, in a capped position;

FIG. 4 is a schematic cross-sectional end elevational view of the printer of FIG. 3 with the second capping device, in an uncapped position;

FIG. 5 is a schematic cross-sectional end elevational view of a portion of another printer having a third type of capping device, in a capped position;

FIG. 6 is a schematic cross-sectional elevational view of a portion of the printer of FIG. 5 with the third capping device in an uncapped position;

FIG. 7 is a schematic front elevational view of a friction clutch used in the embodiment of FIGS. 5 and 6;

FIG. 8 is a schematic cross-sectional end elevational view of a portion of a printer having a fourth type of capping device, in a capped position;

FIG. 9 is a schematic cross-sectional end elevational view of a portion of the printer of FIG. 8 with the fourth capping device shown in an uncapped configuration;

FIG. 10 is a schematic cross-sectional end elevational view of a portion of a printer having a fifth type of capping device, in a capped configuration; and

FIG. 11 is a schematic cross-sectional end elevational view of the portion of the printer of FIG. 10 with the fifth capping device shown in an uncapped configuration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the accompanying drawings there are schematically depicted a number of different capping configurations for a portable printer. The portable printer is intended to eject droplets of ink onto a sheet of print media as the printer is held by hand and moved across the sheet of print media. A typical internal configuration of a printhead and associated hardware in a portable printer for which the capping devices disclosed herein are applicable is disclosed in co-pending application entitled “Manually Moveable Printer with Speed Sensor” (AP43).

In FIGS. 1 and 2 of the accompanying drawings there is schematically depicted in cross-section, a printer housing 10 having located therein a fixed printhead 11. The printhead 11 has a print chip 12 extending throughout its full width, that is, the width of an image to be printed. A first embodiment of a capper arm 13, which may be metallic or formed of other material such as plastics, is pivotally mounted at 14 to the printer housing 10. The capper arm 13 resides at the exterior of the housing 10 and includes a leg 28 to which there is affixed an elastomeric pad 16 which seals against the chip 12 in the capped configuration depicted in FIG. 1. The elastomeric pad 16 is moved away from the print chip 12 by leg 28 to enable printing in the configuration depicted in FIG. 2.

The capper arm 13 includes an activating region 15 to which finger force can be applied as indicated by arrow F shown in FIG. 2. The application of such finger force causes pivoting of the capper arm 13 about pivot 14. A spring (not shown) can return the capper arm to the position shown in FIG. 1.

A second embodiment of the capping device is depicted in FIGS. 3 and 4. In this embodiment, the capper arm 13 is formed of a resilient, elastically deformable material such as metal or plastics. In a particular preferred embodiment, the capper arm 13 is formed of stainless steel. The capper arm 13 is fixed at 17 to the printer housing 10 at one end thereof. A fulcrum 14 (depicted schematically) resides alongside the transition of the capper arm 13 to the leg 29.

Upon the application of finger force F as indicated in FIG. 4, the capper arm 13 deforms, resulting in the leg 29 moving to the position depicted in FIG. 4 so as to draw the elastomeric pad 16 away from the print chip 12 for printing purposes. Upon release of the finger force F, the resilience of the capper returns it to the configuration depicted in FIG. 3 wherein the elastomeric pad 16 seals against the print chip 12.

In the first and second embodiments of the capping device shown in FIGS. 1 to 4, a user grasps the printer housing 10 and in doing so, inherently applies a force F to the activation region 15 of the capper arm 13. There may be provided a switch within the printer housing and associated with the capper arm 13 such that application of finger force F depresses the switch to set the printhead 11 into a printing operational mode.

In FIGS. 5 to 7 of the accompanying drawings there is schematically depicted a third embodiment of a capping device incorporating a friction clutch. In this embodiment, the printer housing 10 has mounted thereto one or more wheels 18, at least one of which can be associated with an optical sensor as described in the cross-referenced application AP43 entitled “Manually Moveable Printer with Speed Sensor”. One of the wheels, ie. wheel 18 in this example, can have associated with it a friction clutch 19. Wheel 18 and clutch 19 can be mounted upon a common shaft 30 (FIG. 7) and biased against each other such that rotation of wheel 18 causes rotation of clutch 19 until something stops the clutch 19 from spinning, whereupon wheel 18 continues to rotate with a dynamic frictional engagement between it and the non-rotating clutch 19. In the embodiment depicted, the friction clutch 19 has a peg 20 extending laterally from it. This peg 20 is received behind a deviated portion 21 of the capper arm 13. In this embodiment, the capper arm 13 is attached within the printer housing 10 such that portion 29 moves in a linear fashion, ie. it is guided to move in a straight line. Upon rotation of friction clutch 19, the peg 20 bears against the deviated portion 21 of capper arm 13 to move it in the direction indicated by arrow C (FIG. 6). This, in turn, draws the elastomeric pad 16 away from the chip 12. It should be appreciated in this regard that wheel 18 is riding upon the print media 22 to effect wheel rotation in the direction indicated by arrow W in FIG. 6. When the printer housing 10 is lifted away from the print media 22, rotation W ceases, whereupon resilience of the capper arm 13 pushes the peg 20 back to the position depicted at FIG. 5 and at the same time returns the elastomeric pad 16 to seal the print chip 12 as shown in FIG. 5.

In a fourth embodiment of the capping device shown in FIGS. 8 and 9, there is provided an internally driven camshaft 24 including an eccentric cam 23. Camshaft 24 might be selectively rotated by means of an electric motor for example. In this embodiment, the capper arm 13 is mounted to a pivot 14 and is biased by an integral spring 25 against the eccentric cam 23. That is, the integral spring 25 biases the leg portion 28 of the capper arm 13 to the position depicted in FIG. 8 whereat the elastomeric pad 16 seals over chip 12. When the camshaft 24 is rotated such that the eccentric cam rotates into the position depicted in FIG. 9, the capper arm 13 deforms integral spring 25 while the elastomeric pad 16 moves away from the print chip 12.

In FIGS. 10 and 11 of the accompanying drawings, there is depicted a fifth embodiment of the capping device wherein the capper arm 13 is activated by an internal solenoid 26. In this embodiment, the capper arm 13 slides linearly between the positions depicted in FIGS. 10 and 11. The capper arm 13 includes an integral spring 25 that bears against solenoid 26. As an alternative, the spring 25 could bear against some other fixed internal structure of the printer housing 10. Attached to the capper arm 13 is a metallic plate 27 to be attracted to the solenoid 26 by magnetic interaction therewith. Application of electric current to the solenoid 26 creates a magnetic field drawing the metal plate 27 thereto. This in turn draws the capper 13 to the uncapped position where the elastomeric pad 16 has moved away from the print chip 12 to enable printing to commence.

When the solenoid is no longer receiving electric current, its magnetic field diminishes or ceases enabling the spring 28 to return the capper arm 13 to the capped position depicted in FIG. 10.

It should be appreciated that modifications and alterations obvious to those skilled in the art are not to be considered as beyond the scope of the present invention. For example, the elastomeric pad need not be affixed to the capper arm itself. Instead, it might be attached to the printhead 11 so as to surround the print chip 12 and come into sealing contact with a smooth surface of leg 28 of capper arm 13.

Claims

1. A handheld inkjet printer comprising: a housing;a printhead fixedly mounted in the housing; anda capping device mounted external to the housing, the capping device comprising an arm, a capping leg extending transversely from the arm and an elastomeric pad affixed to the capping leg and in capping engagement with the printhead, the arm having a resilient portion deformable towards the housing upon receipt of a force, the housing defining a fulcrum with the arm and the leg being positioned on opposite sides of the fulcrum, wherein deformation of the arm towards the housing causes displacement of the capping leg away from the housing and displacement of the elastomeric pad out of capping engagement with the printhead.

2. An inkjet printer as claimed in claim 1, wherein the housing defines a recess which receives the resilient portion of the arm during deformation.

3. An inkjet printer as claimed in claim 1, wherein the force is applied by user's finger.

4. An inkjet printer as claimed in claim 1, wherein the printhead ejects ink towards a surface located external to the housing.