Disposable ink supply bag having connector-fitting

Abstract

A fitting is attached to a disposable ink supply bag and has an ink egress snout for discharging an ink supply from the bag. The fitting is configured to engage with a housing for the bag to permit the bag to be connected to the housing when the ink supply is to be discharged from the snout and to disengage from the housing to permit the bag to be disconnected from the housing in order to dispose of the bag when emptied.

Description

FIELD OF THE INVENTION

The invention relates generally to a disposable ink supply bag intended for an ink cartridge, and in particular to one that can be connected to and disconnected from a housing of the cartridge.

BACKGROUND OF THE INVENTION

The cross-referenced applications filed Aug. 16, 2001 disclose an ink cartridge that has a connectable-disconnectable housing and ink supply bag.

The disclosed cartridge includes an ink bag containing an ink supply, an ink egress snout attached to the ink bag and from which the ink supply is discharged from the ink bag, and a split collar that receives or mates with the snout via an annular rib on the collar and an annular groove on the snout. The collar when mated with the snout can be rotated about the snout to any one of a number of allowable orientations. The particular orientation of the collar that is selected serves to identify the ink supply in the ink bag.

A pair of housing halves for the ink bag when connected together form a bottom opening for the collar. The bottom opening is bounded by multisided edges of the housing halves. The collar has a peripheral recess with a multisided floor that complements the multi-sided edges. This permits the collar when arranged in any one of the orientations to be trapped in the bottom opening to prevent rotation of the collar relative to the snout. Moreover, it serves to secure the bag to the housing halves.

SUMMARY OF THE INVENTION

A disposable ink supply bag and a fitting attached to the bag which has an ink egress snout for discharging an ink supply from the bag, are characterized in that:

the fitting is configured to engage with a housing for the bag to permit the bag to be connected to the housing when an ink supply is to be discharged from the snout and to disengage from the housing to permit the bag to be disconnected from the housing in order to dispose of the bag when emptied.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of an ink cartridge including a disposable ink supply bag, a housing for the bag, and a fitting attached to the bag and which has an ink egress snout for discharging an ink supply from the bag, according to a preferred embodiment of the invention,

FIGS. 2 and 3 are exploded perspective views of the ink supply bag, the ink egress snout, and the fitting, as shown from opposite views, and

FIG. 4 is an enlargement of a bottom portion of the ink cartridge as shown in FIG. 1 .

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawings, FIGS. 1-4 show an ink cartridge 10 for an ink jet printer (not shown). The cartridge includes the following components:

a pair of mating plastic housing halves 12 and 14 ,

a disposable flexible ink supply bag 16 ;

a plastic connector-fitting or fitment 18 having an integral ink egress snout 20 for discharging an ink supply from the bag 16 ;

a plastic single-part collar 22 for the snout 20 , which functions as an ink identifier to identify the ink supply in the bag 16 such as by color or type; and

a memory chip 24 .

As shown in FIGS. 2 and 3 , the fitting 18 is attached via a thermal seal to the bag 16 , within an elongate opening 26 in the bag. During the thermal seal of the bag 16 to the fitting 18 , a small amount of melted material from the bag flows between parallel ribs 28 along opposite longitudinal sides of the fitting 18 to provide an essentially leak-proof seal between the bag and the fitting. A rubber septum 30 is tightly inserted into an ink egress opening 32 in the snout 20 to plug the opening. Then, an aluminum cap 34 is press-fitted on the snout 20 . The cap 34 partially overlaps the septum 30 to capture the septum, and has a center opening 36 which allows a hollow needle (not shown) to pierce the septum in order to discharge an ink supply from the bag 16 when the cartridge 10 is used in an ink jet printer.

The snout 20 has eight identical outer peripheral surfaces or facets 38 that project perpendicular from a longitudinal planar face 40 of the fitting 18 to form an octagon. See FIGS. 2 and 3 . In a similar sense, the collar 22 has a center opening 42 that is circumscribed by eight identical inner peripheral surfaces or facets 44 that form an octagon. This mutual or complementary configuration allows the snout 20 to be received in the center opening 42 only when the collar 22 is in any one of eight allowable angular orientations 0° or 360°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°. Preferably, the eight surfaces 44 of the collar 22 are aligned with the eight surfaces 38 of the snout 20 to position the collar relative to the snout in a selected one of the eight orientations. Then, the collar 22 is mated with the snout 20 in the selected orientation. Respective contact between the eight surfaces 38 and the eight surfaces 44 prevents the collar 22 from being rotated about the snout 22 and thus serves to fix the collar in the selected orientation. The selected orientation provides a visible indication that serves to identify the ink supply in the bag 16 such as by color or type.

As described in the cross-referenced applications filed Aug. 16, 2001 and incorporated into this application, the collar 22 has a key slot or keyway 46 that is positioned in accordance with the selected orientation of the collar. The hollow needle (not shown) for piercing the septum in order to discharge an ink supply from the bag 16 when the cartridge 10 is used in an ink jet printer is mounted on a key assembly (not shown) having a key tab intended to be received in the key slot 46 . The particular orientation of the key assembly must match the selected orientation of the collar 22 in order for the key tab to be received in the key slot 46 .

The number of the surfaces 38 of the snout 20 and the number of the surfaces 44 of the collar 22 , need not each be eight (although they must be the same number). Preferably, the number of the surfaces 38 of the snout 20 and the number of the surfaces 44 of the collar 22 fall within the range 4-12. All that is necessary is that the number of the surfaces 38 of the snout 20 and the number of the surfaces 44 of the collar 22 form similar complementary polygons.

The housing halves 12 and 14 at respective bottom wall portions 48 and 50 have opening halves 52 and 54 that form a bottom opening when the housing halves are connected together. See FIGS. 1 and 4 . The fitting 18 has a pair of L-shaped engageable members or tabs 56 and 58 that project from respective areas of the face 40 (of the fitting) which are spaced from the snout 20 . In a similar sense, a pair of L-shaped engageable members or tabs 60 and 62 project from an inner side 64 of the wall portion 50 and are spaced from the opening half 52 . The L-shaped engageable members 56 and 58 extend in opposite directions as do the L-shaped engageable members 60 and 62 . This complementary arrangement or mutual configuration permits the L-shaped member 56 to engage the L-shaped member 60 and the L-shaped member 58 to engage the L-shaped member 62 when the bag 16 is placed on the housing half 14 . The bag 16 is thus secured in place. At the same time as shown in FIG. 4 an edge 65 of the opening half 54 is received in an outer peripheral groove 66 in the collar 22 to support the collar. Then, when the housing half 12 is connected to the housing half 14 , an edge 68 of the opening half 52 is received in the groove 66 .

When the bag 16 is emptied, it can be removed from the cartridge 10 and disposed of. All that is required is that the housing half 12 be disconnected from the housing half 14 and the L-shaped engageable members 56 and 58 be disengaged from the L-shaped engageable members 60 and 62 . The collar 22 can be removed from the snout 20 if it is to be reused.

Other L-shaped engageable members can be provided on the fitting 18 and the housing half 14 in addition to the L-shaped engageable members 56 and 58 and the L-shaped engageable members 60 and 62 . Also, it is not necessary that these engageable members be L-shaped. A number of known engagements or interlocks can be used instead, such as pins in holes, etc.

When the housing halves 12 and 14 are connected together, the memory chip 24 resides in respective opposite pockets 70 and 72 in the housing halves. See FIGS. 1 and 4 .

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.

PARTS LIST

10 . ink cartridge

12 . housing half

14 . housing half

16 . ink bag

18 . connector-fitting

20 . snout

22 . collar

24 . memory chip

26 . elongate opening

28 . ribs

30 . septum

32 . ink egress opening

34 . cap

36 . center opening

38 . eight surfaces or facets

40 . face

42 . center opening

44 . eight surfaces or facets

46 . key slot

48 . bottom wall portion

50 . bottom wall portion

52 . opening half

54 . opening half

56 . L-shaped engageable member

58 . L-shaped engageable member

60 . L-shaped engageable member

62 . L-shaped engageable member

64 . inner side

65 . edge

66 . groove

68 . edge

70 . pocket

72 . pocket

Claims

1. A disposable ink supply bag, and a fitting attached to said bag which has an ink egress snout for discharging an ink supply from said bag, are characterized in that:said fitting has a pair of opposite longitudinal sides sealed to said bag and has a longitudinal planar face between said sides; said snout projects from said planar face; and at least two engageable members project from said planar face, each spaced from said spout, and are configured to engage with a housing for said bag to permit said bag to be connected to the housing when an ink supply is to be discharged from said snout and to disengage from the housing to permit said bag to be disconnected from the housing in order to remove said bag when emptied.

2. A disposable ink supply bag and a fitting as recited in claim 1, wherein said sides of said fitting each have parallel ribs that permit an amount of melted material from said bag to flow between said ribs to seal said fitting to said bag.

3. A disposable ink supply bag and a fitting as recited in claim 1, wherein said snout has a number of identical outer peripheral facets that project perpendicularly from said planar face of said fitting, and a collar has a center opening that is circumscribed by a number of inner identical peripheral facets that allow said collar to be mated with said snout in a number of different orientations one of which serves as a visible indication to identify the ink supply in said bag.