WO2000074939A9

WO2000074939A9 - Disposable ink cartridge

Info

Publication number: WO2000074939A9
Application number: PCT/US2000/014996
Authority: WO
Inventors: Akehiro Ono
Original assignee: Pitney Bowes Inc
Current assignee: Pitney Bowes Inc
Priority date: 1999-06-08
Filing date: 2000-05-31
Publication date: 2002-04-18
Anticipated expiration: 2001-12-08
Also published as: AU5452700A; WO2000074939A1

Abstract

An ink cartridge (200) for an ink jet printer includes a main body (200h) having a first end (200a), a second end (200b) a lateral side (200c) and a tab (210) extending outward from the lateral side. The tab is offset toward an edge of the lateral side and includes a first portion (210a) proximate to the first end of the main body and a second portion (210b) proximate to the second end of the main body. The second end is larger than the first end.

Description

DISPOSABLE INK CARTRIDGE

Cross Reference to Related Applications

This application is related to the following concurrently filed copending US Patent Application No. 09/327,655, entitled MAILING MACHINE HAVING AN INK CARTRIDGE RECEIVING POCKET ASSEMBLY, the disclosure of which is specifically incorporated herein by reference.

Field of the Invention

This invention relates to ink jet printing systems. More particularly, this invention is directed to a disposable ink cartridge for an ink jet printer.

Background of the Invention

Ink jet printers are well known and have been adapted to a variety of applications, such as: general office printers, point of sale terminals, scientific recording devices and postage metering systems. Generally, ink jet printers include a print head and a supply of ink. In order to print, a series of ink drops are ejected from the print head onto paper until a desired image is achieved. To keep the print head supplied with ink, a variety of ink delivery systems have been developed. In applications where the print head has a long life and the printer exhibits high volume usage, it is desirable to provide a disposable ink cartridge for supplying ink. In this manner, when the ink has been exhausted, a new ink cartridge may be conveniently installed.

There are several important considerations for ink jet printers employing disposable ink cartridges. A few of the considerations are described generally below in no particular order of importance. One consideration is ease of use. The ink cartridge must be easily inserted into and removed from the ink jet printer. That is, even an inexperienced operator must find this process intuitive and quick so that time is not wasted. Another consideration is assurance of a proper mating relationship between the ink cartridge and the ink jet printer. In this manner, ink may be properly delivered from the ink cartridge to the print head. Otherwise, poor quality printing may result. Yet another consideration is operator safety. Replacing ink cartridges must not put the operator at risk of injury due to exposure to sharp objects or moving parts. Because postage metering systems store and dispense postage, print quality takes on an even greater significance. The ink jet printer must operate reliably so that the operator does not experience a loss of postal funds (money). Therefore, proper delivery of ink from the ink cartridge to the print head is critical. Therefore, there is a need for a cost effective ink jet printer having a disposable ink cartridge that is both easy and safe to install/remove and is designed to provide a proper mating relationship between the ink cartridge and the ink jet printer.

Summary of the Invention

Accordingly, it is an object of the present invention to provide disposable ink cartridge that addresses those issues described above.

In accomplishing these and other objects there is provided a disposable ink cartridge for an ink jet printer. The ink cartridge includes a main body having a first end, a second end and a lateral side and a tab extending outward from the lateral side. The tab is offset toward an edge of the lateral side and includes a first portion proximate to the first end of the main body and a second portion proximate to the second end of the main body. The second portion is larger than the first portion.

Therefore, it should now be apparent that the invention substantially achieves the objects and advantages discussed above. Additional objects and advantages of the invention will be set forth in the description that follows, and in part will be obvious from the description, or may be learned by practice of the invention. Moreover, the objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the appended claims. Brief Description of the Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate presently preferred embodiments of the invention, and together with the general description given above and the detailed description of the preferred embodiments given below, serve to explain the principles of the invention. As shown through out the drawings, like reference numerals designate like or corresponding parts.

Fig. 1 is a top view of a pocket assembly into which an ink cartridge (not shown) may be installed in accordance with the present invention. Fig. 2 is a side sectional view, as defined by line 2-2 as shown in Fig. 1 , of the pocket assembly without the ink cartridge in accordance with the present invention.

Fig. 3 is a top sectional view, as defined by the line 3-3 as shown in Fig. 2, of the pocket assembly without the ink cartridge in accordance with the present invention.

Fig. 3A is a top sectional view, as defined by the line 3-3 as shown in Fig.

2, of the pocket assembly having the ink cartridge installed therein in accordance with the present invention.

Fig. 4 is a side sectional view, as defined by the line 4-4 as shown in Fig. 3, of the pocket assembly without the ink cartridge in accordance with the present invention.

Fig. 4A is a side sectional view, as defined by the line 4-4 as shown in Fig.

3, of the pocket assembly having the ink cartridge installed therein in accordance with the present invention. Fig. 5 is an end sectional view, as defined by the line 5-5 as shown in Fig.

4, of the pocket assembly without the ink cartridge in accordance with the present invention.

Fig. 5A is an end sectional view, as defined by the line 5-5 as shown in Fig. 4, of the pocket assembly having the ink cartridge installed therein in accordance with the present invention. Fig. 6 is an exploded perspective view of the ink cartridge and the pocket assembly in accordance with the present invention.

Detailed Description of the Preferred Embodiments

Referring to Fig. 1 , a top view of a pocket assembly 100 into which an ink cartridge (not shown) may be installed in accordance with the present invention is shown. The pocket assembly 100 may be incorporated into any suitable ink jet printer (not shown) or other system (not shown) having an ink jet printer as described above.

Referring to Figs. 1 , 2, 3, 4 and 5, the pocket assembly 100 includes a needle 102, a housing 110, a door 160, a door mechanism 170. The needle 102 is mounted to the housing 110 so as to protrude into the interior of the housing 110 and serves as a hollow tube for supplying a passage for the ink (not shown) within the ink cartridge (not shown) to flow out of the ink cartridge and into the ink jet printer (not shown). The housing 110 is generally a thin walled box type structure that encloses a volume of space, more commonly referred to as a pocket 111. The housing 110 includes a pair of snaps 112 located on a top side 110t of the housing 110 and protruding into the pocket 111 , an opening 114 at one end for receiving the ink cartridge (not shown) as indicated by the doubled sided arrow A, a recess 116, a pair of bosses 118 and a pair of grooves 120. The needle 102 is mounted at the other end of the housing 110 opposite to the opening 114. The door 160 and the door mechanism 170 operate to protect an operator (not shown) from inadvertently touching the needle 102 when the ink cartridge (not shown) is not installed. The door 160 is pivotably mounted to the housing 110 within the pocket 111. The door 160 is designed to substantially close off a portion of the pocket 111 proximate to the needle 102. When the ink cartridge (not shown) is not installed, the door 160 is in a closed position (Fig. 4) blocking access to the needle 102 from the opening 114. In contrast, when the ink cartridge (not shown) is installed, the door 160 is in an open position (Fig. 4A) allowing access to the needle 102. The door mechanism 170 actuates the door 160 between the closed and open position and includes a pivot finger 172 having a first end 172a and a second end 172b, a push arm 174 having a first end 174a and a second end 174b, a spring 176 and a spur gear 178. The pivot finger 172 is rotatively mounted along its length to the housing 110 in any conventional manner, such as by snapping it onto a boss extending from the housing 110. The first pivot finger end 172a extends into one of the pair of grooves 120 while the second pivot finger end 172b is pivotably mounted in any conventional manner to the first push arm end 174a. The second push arm end 174b includes a rack gear 174c that is in operative engagement with the spur gear 178. The spur gear 178 and the door 160 are fixably mounted together, such as by fixably mounting on a common shaft 175, so that as the spur gear 178 rotates, the door 160 rotates in kind. The spring 176 extends between the door 160 and the housing 110 so that the door 160 is biased toward the closed position. Referring to Figs. 6 and 3A, an exploded perspective view of the ink cartridge 200 and the pocket assembly 100 in accordance with the present invention is shown. The ink cartridge 200 includes a main body or housing 200h, a supply of ink 201 contained within an ink bag 203 in turn located within the housing 200h, an extended region 204 on a first end 200a of the main body 200h, an extended region 205 on a second end 200b of the main body 200h, a rubber septum 206 located within the extended region 204, a pair of recesses 208 located on a top side 200t of the main body 200h and a pair of tabs 210 (only one visible) located on lateral sides 200c of the main body 200h. The tabs 210 includes a first portion 210a and a second portion 210b larger than the first tab portion 210a. The pair of recesses 208 are adapted to receive the pair of snaps 112, respectively while the pair of tabs 210 are adapted to travel within the pair of grooves 120 (not shown), respectively.

With the structural aspects of the present invention described as above, various pre-installation operational aspects will now be described. Referring primarily to Fig. 4 in view of the structure of Figs. 1 , 2, 3, 5, and 6, in the absence of the ink cartridge 200, the spring 176 maintains the door 160 in the closed position. In the closed position, the door 160 blocks access to the needle 102. Thus, if the operator were to reach inside the pocket 111 , then the door 160 prevents inadvertent injury due to touching the needle 102. As an additional safety measure, a top edge 160a of the door 160 is seated in the recess 116. The top edge 160a and the recess 116 are designed to have conforming shapes (both rounded as shown) so that the operator cannot get a grip on the door top edge 160a and pull the door 160 toward the open position. As still another safety measure, the door top edge 160a is seated in the recess 116 so that the door 160 assumes a reclined angle (toward the opening 114). Thus, provided that the door 160 is sufficiently rigid (a pattern of strengthening ribs may be employed), the operator cannot push the door 160 open due to the positive interference between the door 160 and the housing 110.

With the pre-installation operational aspects of the present invention described as above, various operational aspects concerning installation of the ink cartridge 200 will now be described. Referring primarily to Figs. 5, 5A and 6 in view of Figs. 1 , 2, 3, 3A, 4 and 4A, the cartridge 200 and the pocket assembly 100 are adapted so that the cartridge 200 can only be assembled in one particular orientation. Generally, the tabs 210 are offset from the center of the lateral sides 200c while the grooves 120 are correspondingly offset from the center of the pocket 111. In this way, the cartridge 200 may only be inserted so that the cartridge top side 200t is aligned substantially parallel with and directly opposite to the housing top side 110t.

Referring primarily to Figs. 2, 4, 4A, 5 and 5A in view of Figs. 1 , 3, 3A, and 6, the cartridge 200 is installed in the pocket assembly 100 by inserting the cartridge first end 200a containing the rubber septum 206 into the pocket 111. The tabs 210 fit within and slide along the grooves 120, respectively, as the cartridge 200 is inserted. During insertion, one of the tabs 210 engages the pivot finger first end 172a that protrudes into the groove 120. As the cartridge 200 continues toward the needle 102, the pivot finger 172 rotates causing the push arm 174 to translate so that the spur gear 178 rotates counter-clockwise (as view in Fig. 2) which in turn causes the door 160 to rotate from the closed position to the open position. It should be noted that the door 160 should reach the open position prior to the arrival of the cartridge first end 200a so that an interference does not occur. Referring to Figs. 3A and 4A, the cartridge 200 is shown fully installed within the pocket assembly 100. In this position, the needle 102 has pierced the septum 206 and entered the ink bag 203 so that the needle 102 is in contact with the ink 201. Also, the snaps 112 have seated themselves in the recesses 208. This serves as an additional measure to keep the cartridge 200 from inadvertently dislodging from the final installation position due to vibration or other reasons. To prevent the needle 102 from becoming damaged, the cartridge 200 is not allowed to "bottom out" in the pocket 111. Instead, the cartridge 200 comes into contact with the bosses 118 to define a final or forward most insertion position for the cartridge 200. In this forward most insertion position, the cartridge first end 200a does not contact the housing 110. As a result, the shear forces on the needle 102 are reduced. To provide further positive tactile feedback to the operator, the recesses 208 and corresponding snaps 210 are located on their respective parts to be in proper mating relationship in the final insertion position.

To further prevent the needle 102 from becoming damaged, the cartridge 200 will only cause the door 160 to rotate to the open position when the cartridge end 200a is inserted. If the cartridge second end 200b is inserted, then the door 160 will not rotate to the open position. Since the extended region 205 of the cartridge second end 200b contacts the door 160 before the tab 210 sufficiently engages the pivot finger 172 to rotate the door 160 to the open position, the cartridge 200 cannot reach the needle 102 when inserted in this manner. Here, the important consideration is that a first distance or dimension D1 (measured along the insertion direction) between a forward most point of the cartridge first end 200a and the tab first portion 210a allows the pivot finger 172 to be engaged without obstructing the movement of the door 160 while the a second distance D2 (measured along the insertion direction) between a rearward most point of the cartridge second end 200b and the tab second portion 210b does not allow engagement of the pivot finger 172 sufficient to rotate the door 160 to the open position before the rearward most point contacts the door 160. Thus, the first distance D1 is less than the second distance D2. Preferably, the rearward most point contacts the door 160 before the tab second portion 210b reaches the pivot finger 172. Accordingly, those skilled in the art will recognize that there is only one orientation for which the cartridge 200 will reach the needle 102 so that the operator cannot improperly install the cartridge 200.

With the structural and operational aspects of the present invention described as above, various dimensional aspects will now be described. Referring to Figs. 3, 4 and 5, the grooves 120 are dimensioned (less than approximately .250 inches wide, preferably about .200 inches) to be smaller than an adult's finger so that the pivot finger 172 cannot be articulated manually. The depth of the grooves 120 must be sufficient to accommodate the pivot finger 172. Preferably, the pivot finger 172 is more than about .200 inches deep into the groove 120. This provides an added measure of safety for operators that may insert their hand into the pocket 111.

Referring to Figs. 3, 3A, 4, 4A, 5, 5A and 6, the tabs 210 perform dual functions. First, the tabs 210 and the grooves 120 are dimensioned to facilitate insertion of the cartridge 200 and proper alignment of the septum 206 with the needle 102. Second, as described above, the tabs 210 engage the door mechanism 170. The tab first portion 210a is smaller than the tab second portion 210b, preferably on all three sides of the tab 210 by about .030 inches per side. Similarly, the grooves 120 includes a first portion 120a and a second portion 120b where the groove second portion 120b is smaller than the groove first portion 120a, preferably on all three sides of the groove 120 by about .030 inches per side. Thus, when the cartridge first end 200a is initially inserted into the pocket 111 , sufficient clearance (about .080 inches per side) exists between the tab first portion 210a and the groove first portion 120a to facilitate easy installation by the operator. However, in the final insertion position, the tab first portion 210a is in mating relationship with the groove second portion 120b while the tab second portion 210b is in mating relationship with the groove first portion 120a. In this position, the clearance (about .020 inches per side) has been reduced to that which is necessary to allow the cartridge 200 to be installed without binding and provide for proper alignment of the septum 206 with the needle 102 to avoid damage to the needle 102 during installation. Many features of the preferred embodiment represent design choices selected to best exploit the inventive concepts of the present invention. However, those skilled in the art will recognize that modifications to the preferred embodiment may be made with departing from the spirit of the present invention. For example, the tabs and grooves may be tapered instead of stepped to produce the same desired effects as described above. As another example, only one tab and one groove may be employed. As yet another example, only one snap and one recess may be employed. As yet still another example, only the snap(s), the recess(es) and the tab(s) may all be located on the same surface of the housing. Still further, those skilled in the art will recognize that the features described above are largely independent and may be employed in a variety of combinations depending upon the needs of the particular application for the disposable ink cartridge.

Therefore, the inventive concepts in their broader aspects are not limited to the specific details of the preferred embodiment but are defined by the appended claims and their equivalents.

Claims

What is Claimed is:

1. An ink cartridge for an ink jet printer, the cartridge comprising: a main body including a first end, a second end and a lateral side; and a tab extending outward from the lateral side, the tab being offset toward an edge of the lateral side, the tab including a first portion proximate to the first end of the main body and a second portion proximate to the second end of the main body, the second portion being larger than the first portion.

2. The ink cartridge of claim 1 , wherein: the main body further includes a top surface having a recess.

3. The ink cartridge of claim 2, wherein: the ink cartridge is capable of being installed in the ink jet printer along an insertion direction; and a first distance, measured along the insertion direction, between a forward most point of the first end and the tab first portion is less than a second distance, measured along the insertion direction, between a rearward most point of the cartridge second end and the tab second portion.

4. The ink cartridge of claim 3, wherein: the main body includes a first extended region located on the first end; and further comprising: an ink bag located inside the main body; a supply of ink contained within the ink bag; and a septum located in the first extended region and operatively coupled with the ink bag.

5. The ink cartridge of claim 1 , wherein: the main body includes a first extended region located on the first end; and further comprising: an ink bag located inside the main body; a supply of ink contained within the ink bag; and a septum located in the first extended region and operatively coupled with the ink bag.

6. The ink cartridge of claim 5, wherein: the ink cartridge is capable of being installed in the ink jet printer along an insertion direction; and a first distance, measured along the insertion direction, between a forward most point of the first end and the tab first portion is less than a second distance, measured along the insertion direction, between a rearward most point of the cartridge second end and the tab second portion.

7. The ink cartridge of claim 1 , wherein: the ink cartridge is capable of being installed in the ink jet printer along an insertion direction; and a first distance, measured along the insertion direction, between a forward most point of the first end and the tab first portion is less than a second distance, measured along the insertion direction, between a rearward most point of the cartridge second end and the tab second portion.

8. An ink cartridge for an ink jet printer; the ink jet printer including a pocket assembly including a housing defining a pocket, a needle mounted to the housing so as to protrude into the pocket, a snap protruding into the pocket, a door pivotably mounted to the housing within the pocket and a door mechanism for repositioning the door between a closed position blocking access to the needle and an open position allowing access to the needle; the housing including a recess extending away from the pocket, a boss protruding into the pocket and a groove extending away from the pocket; the door mechanism extending into the groove; the ink cartridge being capable of being installed in the ink jet printer along an insertion direction; the cartridge comprising: a main body including a first end, a second end, a lateral side and a top surface having a recess; an ink bag located inside the main body; a supply of ink contained within the ink bag; and a septum located in the first extended region and operatively coupled with the ink bag; a tab extending outward from the lateral side, the tab being adapted to fit within the groove and being offset toward an edge of the lateral side, the tab including a first portion proximate to the first end of the main body and a second portion proximate to the second end of the main body, the second portion being larger than the first portion; and wherein: the main body has a first distance, measured along the insertion direction, between a forward most point of the first end and the tab first portion is less than a second distance, measured along the insertion direction, between a rearward most point of the cartridge second end and the tab second portion so that if the cartridge second end is inserted into the pocket, then the cartridge second end contacts the door of the pocket assembly before the door mechanism is engaged to pivot the door from the closed position to the open position; and if the cartridge first end is inserted into the pocket, then:

(i) the tab first portion engages the door mechanism to pivot the door from the closed position to the open position thus exposing the needle of the pocket assembly; (ii) the main body first end contacts the boss of the pocket assembly to establish a final installation position; and

(iii) the snap engages the recess so as to secure the cartridge in the final installation position.