Printing cartridge with molded cantilever developer roller spacing spring

RELATED CASES
Cross reference is made to the following applications filed concurrently herewith: U.S. patent application Ser. No. 08/971,073, now U.S. Pat. No. 5,845,179 entitled "Pin Charge Corotron With Optimum Dimensions For Minimum Ozone Production" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,719, now U.S. Pat. No. 5,822,654, entitled "Development Bias Connector with Integral Bearing Support" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,842 entitled "Charging Device Module For Use With Print Cartridge" by Ajay Kumar et al., U.S. patent application Ser. No. 08/971,098 entitled "Charging Device Having An Electrode With Integral Electrical Connector" by Ajay Kumar et al., Attorney Docket Number U.S. patent application Ser. No. 08/971,015 entitled "Charging Device Having A Shield With Integral Electrical Connector" by Ajay Kumar et al., U.S. patent application Ser. No. 08/970,322, now U.S. Pat. No. 5,835,823, entitled "Process Cartridge Including Process Components Having Critical Image Quality And Life-Extending Process Path Acting Regions" by Dhirendra C, Damji et al., U.S. patent application Ser. No. 08/971,690, now U.S. Pat. No. 5,826, 132, entitled "Variable size, Replaceable Toner Sump Pans For Print Cartridges" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,313 entitled "Molded Quick Change Photoreceptor Support" by Ajay Kumar et al., U.S. patent application Ser. No. 08/971,010 entitled "Printing Cartridge With Planar Drive Train" by Ajay Kumar et al., U.S. patent application Ser. No. 08/970,839, now U.S. Pat. No. 5,784,671, entitled "Process Cartridge Including A Handle Defining Part Of A Machine Paper Path" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,321, now U.S. Pat. No. 5,809,377, entitled "Electrostatographic Process Cartridge Having A Non-Metallic Photoreceptor Grounding Pin " by Daniel A. Chiesa et al., U.S. patent application Ser. No. 08/970,318, now U.S. Pat. No. 5,809,376, entitled "Limited Life Electrostatographic Process Cartridge Having A Waste Toner Electro-Sump Subassembly" by Daniel A. Chiesa et al., U.S. patent application Ser. No. 08/970,324, now U.S. Pat. No. 5,832,345 entitled "Process Cartridge Having A Drive Assembly Resultant Force Counter-Acting Member" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,320, now U.S. Pat. No. 5,778,283, entitled "Process Cartridge Including A Banding Defect Preventing Waste Toner Moving Auger" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,323 entitled "Process Cartridge Including A Developer Housing Defining Part Of A Machine Paper Path" by Dhirendra C. Damji et al., U.S. patent application Ser. No. 08/970,847, now U.S. Pat. No. 5,778,284, entitled "All-in-One Process Cartridge Including A Photoreceptor And Process Components Having Relative Critical, Image Quality Acting Regions" by Dhirendra C. Damji et al., and U.S. patent application Ser. No. 08/970,319 entitled "User Interface For An Electrostatographic Reproduction Machine" by Mark L. Leveto.
BACKGROUND
This invention relates to electrostatographic reproduction machines, and more particularly to an economical and capacity-extendible all-in-one process cartridge for easy adaptive use in a family of compact electrostatographic reproduction machines having different volume capacities and consumable life cycles. Specifically this invention relates to such a cartridge including a printing cartridge with a molded cantilever developer roller spacing spring.
Generally, the process of electrostatographic reproduction, as practiced in electrostatographic reproduction machines, includes charging a photoconductive member to a substantially uniform potential so as to sensitize the surface thereof. A charged portion of the photoconductive surface is exposed at an exposure station to a light image of an original document to be reproduced. Typically, an original document to be reproduced is placed in registration, either manually or by means of an automatic document handler, on a platen for such exposure.
Exposing an image of an original document as such at the exposure station, records an electrostatic latent image of the original image onto the photoconductive member. The recorded latent image is subsequently developed using a development apparatus by bringing a charged dry or liquid developer material into contact with the latent image. Two component and single component developer materials are commonly used. A typical two-component dry developer material has magnetic carrier granules with fusible toner particles adhering triboelectrically thereto. A single component dry developer material typically comprising toner particles only can also be used. The toner image formed by such development is subsequently transferred at a transfer station onto a copy sheet fed to such transfer station, and on which the toner particles image is then heated and permanently fused so as to form a "hardcopy" of the original image.
It is well known to provide a number of the elements and components, of an electrostatographic reproduction machine, in the form of a customer or user replaceable unit (CRU). Typically such units are each formed as a cartridge that can be inserted or removed from the machine frame by a customer or user. Reproduction machines such as copiers and printers ordinarily include consumable materials such as toner, volume limiting components such as a waste toner container, and life cycle limiting components such as a photoreceptor and a cleaning device. Because these elements of the copying machine or printer must be replaced frequently, they are more likely to be incorporated into a replaceable cartridge as above.
There are therefore various types and sizes of cartridges, varying from single machine element cartridges such as a toner cartridge, to all-in-one electrostatographic toner image forming and transfer process cartridges. The design, particularly of an all-in-one cartridge can be very costly and complicated by a need to optimize the life cycles of different elements, as well as to integrate all the included elements, while not undermining the image quality. This is particularly true for all-in-one process cartridges to be used in a family of compact electrostatographic reproduction machines having different volume capacities and elements having different life cycles.
There is therefore a need for a quality image producing, economical and capacity-extendible all-in-one process cartridge that is easily adapted for use in various machines in a family of compact electrostatographic reproduction machines having different volume capacities and elements with different life cycles.
The step of development or placing the toner particles in contact with the latent image on the photoconductor drum to form the developed image requires that the marking particles or toner be presented to the photoconductive drum. Typically, a donor roll or a roll including a stationary internal magnetic shaft with a rotatable aluminum steel positioned around the outer peripheral of the shaft is utilized to advance the marking particles toward the photoconductive drum.
The spacing between the developer roll and the photoconductive drum surface is important. Spacers placed on the developer roll are often used to ride against the photoconductive surface of the photoconductive drum to maintain an accurate distance between the developer roll and the photoconductive drum. To assure that the spacer remains in contact with the photoconductive surface of the photoconductive drum, preferably, the developer roll is pivotably positioned into contact with the photoconductive drum. A device, usually in the form of a spring, is used to urge the developer roll against the photoconductive drum.
To maintain the urging force of the developer roll against the photoconductive drum, springs typically in the form of a coil spring are positioned between the pivotable developer housing and the printing machine or a fixed printing or process cartridge within the printing machine. The use of this spring adds assembly costs to the printing machine or print cartridge in which the springs are located.
Further, the springs must be assembled into the developer cartridge and print cartridge requiring added cost. Also, the springs are small loose parts and may become dislodged from their desired position during assembly and these assembly errors may cost quality problems within the printing cartridge.
The following disclosures may be relevant to various aspects of the present invention:
U.S. Pat. No. 4,556,308
Patentee: Hoppner, et al.
Issue Date: Dec. 3, 1985
U.S. Pat. No. 4,987,446
Patentee: Mochimaru, et al.
Issue Date: Jan. 22, 1991
U.S. Pat. No. 5,581,325
Patentee: Yashiro
Issue Date: Sep. 12, 1995
U.S. Pat. No. 4,556,308 discloses a process cartridge including a mounting device including a pair of locating pivot pins. Mounting hinge slots are in engagement with cartridge latch blocks. The latch blocks have arcuate slots and a curved outer deflectable cantilever spring arm. The spring arm provides an interference with the cartridge mounting pins and is deflected thereby providing a counterbalance to the cartridge.
U.S. Pat. No. 4,987,446 discloses a process cartridge for use in a electrophotographic apparatus. The cartridge includes a charger and a cleaning unit which are mounted on the cartridge integrally with each other.
U.S. Pat. No. 5,581,325 discloses a process cartridge including a first support member for supporting an image bearing member, a second support member for supporting a development unit and a compression spring for generating an elastic force between the image bearing member and the development unit.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a spring for use in a process cartridge for use in a printing machine. The spring for urging a development roll mounted to a development housing pivotably mounted to a process cartridge housing toward a latent image to form a developed image. The spring includes an arm fixedly secured to either the process cartridge housing or the development housing. The arm includes a distal end thereof. The distal end of the arm is contactable with the other of either the process cartridge housing or the development housing.
In accordance with another aspect of the present invention, there is provided a process cartridge for providing marking particles to develop a latent image for use in an electrostatographic printing device. The process cartridge includes a process cartridge housing and a development housing pivotably mounted to the process cartridge housing. The process cartridge further includes a member mounted to the development housing for advancing the marking particles toward the latent image and a spring. The spring is fixedly secured to one of either of the process cartridge housing or the development housing. The spring includes an arm having a distal end thereof. The distal end is contactable with the other of the process cartridge housing or the development housing for urging the member toward a latent image.
In accordance with yet another aspect of the present invention, there is provided an electrophotographic printing machine of the type including a process cartridge for applying developer material onto a latent image to form a developed image. The process cartridge includes a process cartridge housing and a development housing pivotably mounted to the process cartridge housing. The process cartridge further includes a member mounted to the development housing for advancing the marking particles toward the latent image and a spring. The spring is fixedly secured to one of either of the process cartridge housing or the development housing. The spring includes an arm having a distal end thereof. The distal end is contactable with the other of the process cartridge housing or the development housing for urging the member toward a latent image.

BRIEF DESCRIPTION OF THE DRAWINGS
In the detailed description of the invention presented below, reference is made to the drawings, in which:
FIG. 1 is a front vertical illustration of an exemplary compact electrostatographic reproduction machine comprising separately framed mutually aligning modules in accordance with the present invention;
FIG. 2 is a top perspective view of the module housing of the CRU or process cartridge module of the machine of FIG. 1;
FIG. 3 is a bottom perspective view of the developer subassembly of the CRU or process cartridge module of the machine of FIG. 1 with the bottom of the developer housing unattached;
FIG. 4 is an open bottom perspective view of the CRU or process cartridge module of the machine of FIG. 1;
FIG. 5 is an exploded view of the various subassemblies of the CRU or process cartridge module of the machine of FIG. 1;
FIG. 6 is a vertical section (front-to-back) of the CRU or process cartridge module of the machine of FIG. 1;
FIG. 7 is a partial vertical section (front-to-back) of the CRU or process cartridge module of the machine of FIG. 1 showing the molded cantilever spring of the present invention in more detail;
FIG. 8 is a partial perspective view of the molded cantilever spring of FIG. 7;
FIG. 9 is a perspective view of the developer subassembly of the CRU or process cartridge module of the machine of FIG. 1 showing the location in which the molded cantilever spring will contact the developer subassembly; and
FIG. 10 is a perspective view of the machine of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION
While the present invention will be described in connection with a preferred embodiment thereof, it will be understood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
Referring now to FIGS. 1 and 9, there is illustrated a frameless exemplary compact electrostatographic reproduction machine 20 comprising separately framed mutually aligning modules according to the present invention. The compact machine 20 is frameless, meaning that it does not have a separate machine frame to which electrostatographic process subsystems are assembled, aligned to the frame, and then aligned relative to one another as is typically the case in conventional machines. Instead, the architecture of the compact machine 20 is comprised of a number of individually framed, and mutually aligning machine modules that variously include pre-aligned electrostatographic active process subsystems.
As shown, the frameless machine 20 comprises at least a framed copy sheet input module (CIM) 22. Preferably, the machine 20 comprises a pair of copy sheet input modules, a main or primary module the CIM 22, and an auxiliary module the (ACIM) 24, each of which has a set of legs 23 that can support the machine 20 on a surface, therefore suitably enabling each CIM 22, 24 to form a base of the machine 20. As also shown, each copy sheet input module (CIM, ACIM) includes a module frame 26 and a copy sheet stacking and lifting cassette tray assembly 28 that is slidably movable in and out relative to the module frame 26. When as preferred here, the machine 20 includes two copy sheet input modules, the very base module is considered the auxiliary module (the ACIM), and the top module which mounts and mutually aligns against the base module is considered the primary module (the CIM).
The machine 20 next comprises a framed electronic control and power supply (ECS/PS) module 30, that as shown mounts onto, and is mutually aligned against the CIM 22 (which preferably is the top or only copy sheet input module). A framed latent image forming imager module 32 then mounts over and is mutually aligned against the ECS/PS module. The ECS/PS module 30 includes all controls and power supplies (not shown) for all the modules and processes of the machine 20. It also includes an image processing pipeline unit (IPP) 34 for managing and processing raw digitized images from a Raster Input Scanner (RIS) 36, and generating processed digitized images for a Raster Output Scanner (ROS) 38. The ECS/PS module 30 also includes harnessless interconnect boards and inter-module connectors (not shown), that provide all power and logic paths to the rest of the machine modules. An interconnect board (PWB) (not shown) connects the ECS controller and power supply boards (not shown) to the inter-module connectors., as well as locates all of the connectors to the other modules in such a manner that their mating connectors would automatically plug into the ECS/PS module during the final assembly of the machine 20. Importantly, the ECS/PS module 30 includes a module frame 40 to which the active components of the module as above are mounted, and which forms a covered portion of the machine 20, as well as locates, mutually aligns, and mounts to adjacent framed modules, such as the CIM 22 and the imager module 32.
The framed copy sheet input modules 22, 24, the ECS/PS module 30, and the imager module 32, as mounted above, define a cavity 42. The machine 20 importantly includes a customer replaceable, all-in-one CRU or process cartridge module 44 that is insertably and removably mounted within the cavity 42, and in which it is mutually aligned with, and operatively connected to, the framed CIM, ECS/PS and imager modules 22, 30, 32.
As further shown, the machine 20 includes a framed fuser module 46, that is mounted above the process cartridge module 44, as well as adjacent an end of the imager module 32. The fuser module 46 comprises a pair of fuser rolls 48, 50, and at least an exit roll 52 for moving an image carrying sheet through, and out of, the fuser module 46 into an output or exit tray 54. The fuser module also includes a heater lamp 56, temperature sensing means (not shown), paper path handling baffles(not shown), and a module frame 58 to which the active components of the module, as above, are mounted, and which forms a covered portion of the machine 20, as well as locates, mutually aligns, and mounts to adjacent framed modules, such as the imager module 32 and the process cartridge module 44.
The machine then includes an active component framed door module 60 that is mounted pivotably at pivot point 62 to an end of the CIM 22. The door module 60 as mounted, is pivotable from a substantially closed vertical position into an open near-horizontal position in order to provide access to the process cartridge module 44, as well as for jam clearance of jammed sheets being fed from the CIM 22. The Door module 60 comprises active components including a bypass feeder assembly 64, sheet registration rolls 66, toner image transfer and detack devices 68, and the fused image output or exit tray 54. The door module 60 also includes drive coupling components and electrical connectors (not shown), and importantly, a module frame 70 to which the active components of the module as above are mounted, and which forms a covered portion of the machine 20, as well as, locates, mutually aligns, and mounts to adjacent framed modules, such as the CIM 22, the process cartridge module 44, and the fuser module 46.
More specifically, the machine 20 is a desktop digital copier, and each of the modules 22, 24, 30, 32, 44, 48, 60, is a high level assembly comprising a self-containing frame and active electrostatographic process components specified for sourcing, and enabled as a complete and shippable product. It is believed that some existing digital and light lens reproduction machines may contain selective electrostatographic modules that are partitioned for mounting to a machine frame, and in such a manner that they could be designed and manufactured by a supplier. However, there are no known such machines that have no separate machine frame but are comprised of framed modules that are each designed and supplied as self-standing, specable (i.e. separately specified with interface inputs and outputs), testable, and shippable module units, and that are specifically crafted and partitioned for enabling all of the critical electrostatographic functions upon a simple assembly. A unique advantage of the machine 20 of the present invention as such is that its self-standing, specable, testable, and shippable module units specifically allow for high level sourcing to a small set of module-specific skilled production suppliers. Such high level sourcing greatly optimizes the quality, the total cost, and the time of delivering of the final product, the machine 20.
Referring now to FIGS. 1-6, the CRU or process cartridge module 44 generally comprises a module housing subassembly 72, a photoreceptor subassembly 74, a charging subassembly 76, a developer subassembly 78 including a source of fresh developer material, a cleaning subassembly 80 for removing residual toner as waste toner from a surface of the photoreceptor, and a waste toner sump subassembly 82 for storing waste toner. The module housing subassembly 72 of the CRU or process cartridge module 44 importantly provides and includes supporting, locating and aligning structures, as well as driving components for the process cartridge module 44.
Still referring to FIG. 1, operation of an imaging cycle of the machine 20 using the all-in-one process cartridge module 44 generally, can be briefly described as follows. Initially, a photoreceptor in the form of a photoconductive drum 84 of the customer replaceable unit (CRU) or process cartridge module 44, rotating in the direction of the arrow 86, is charged by the charging subassembly 76. The charged portion of the drum is then transported to an imaging/exposing light 88 from the ROS 38 which forms a latent image on the drum 84, corresponding to an image of a document positioned on a platen 90, via the imager module 32. It will also be understood that the imager module 32 can easily be changed from a digital scanning module to a light lens imaging module.
The portion of the drum 84 bearing a latent image is then rotated to the developer subassembly 78 where the latent image is developed with developer material such as with charged single component magnetic toner using a magnetic developer roller 92 of the process cartridge module 44. The developed image on the drum 84 is then rotated to a near vertical transfer point 94 where the toner image is transferred to a copy sheet substrate 96 fed from the CIM 22 or ACIM 22 along a copy sheet or substrate path 98. In this case, the detack device 68 of the door module 60 is provided for charging the back of the copy sheet substrate (not shown) at the transfer point 94, in order to attract the charged toner image from the photoconductive drum 84 onto the copy sheet substrate.
The copy sheet substrate with the transferred toner image thereon, is then directed to the fuser module 46, where the heated fuser roll 48 and pressure roll 50 rotatably cooperate to heat, fuse and fix the toner image onto the copy sheet substrate. The copy sheet substrate then, as is well known, may be selectively transported to the output tray 54 or to another post-fusing operation.
The portion of the drum 84 from which the developed toner image was transferred is then advanced to the cleaning subassembly 80 where residual toner and residual charge on the drum 84 are removed therefrom. The imaging cycle of the machine 20 using the drum 84 can then be repeated for forming and transferring another toner image as the cleaned portion again comes under the charging subassembly 76.
The detailed and specific advantageous aspects of the structure and operation of the all-in-one CRU or process cartridge module 44, will now be described with particular reference to FIGS. 1 to 6. As shown, the all-in-one CRU or process cartridge module 44, generally includes six subassemblies comprising the module housing subassembly 72 (FIG. 2); the cleaning subassembly 80; the photoreceptor subassembly 74; the charging subassembly 76; the developer subassembly 78 (FIG. 3); and the waste toner sump subassembly 82. Generally, the function of the all-in-one CRU or process cartridge module 44 in the machine 20 is to electrostatically form a latent image, develop such latent image into a toner image through toner development, and transfer the toner image unfused onto a printing medium, such as a sheet of paper. The CRU or process cartridge module is left-side accessible to an operator facing the CIM 22 by opening the door module 60 (FIG. 1). Once the door module is opened, an operator or customer can remove or insert the CRU or process cartridge module 44 with one hand.
Referring now to FIGS. 1-6, the module housing subassembly 72 is illustrated (FIG. 2). As shown, it comprises a generally rectangular and inverted trough shaped module housing 100 having a first side wall 102, a second and opposite side wall 104, a top wall 106 including a substantially horizontal portion 108 and a nearly vertical portion 110 defining a raised rear end 112 (rear as considered relative to the process cartridge 44 being inserted into the cavity 42). There is no rear wall, thus resulting in an open rear end 114 for mounting the photoreceptor subassembly 74. The trough shaped module housing also includes a front end wall 116 that connects at an angle to the top wall 106. The trough shaped module housing 100 of course, has no bottom wall, and hence as inverted, it defines a trough region 118 that is wide open for assembling the developer subassembly 78 (FIG. 3). The top wall 106 and the front end wall 116 each include a first cutout 120 formed through their adjoining corner for partially defining a first light path 122 (FIG. 1) for the exposure light 88 from the ROS 38 of the imager module 32. The top wall 106 also includes a second cutout 124 formed thereinto at the adjoining angle between the horizontal 108 and near vertical 110 portions thereof for mounting the charging subassembly 76 (FIG. 5), and for partially defining a second light path 126 (FIGS. 1 and 6) for an erase light 128 being focused into the photoreceptor area at the raised rear end 112 of the module housing 100.
Importantly, the module housing 100 includes two top wall cross-sectional surfaces 130, 132 defining the second cutout 124, and one 130, of these cross-sectional wall surfaces, has a desired angle 134 (relative to the photoreceptor surface) for mounting and setting a cleaning blade 138 (FIG. 6) of the cleaning subassembly 80. Attachment members 140, 142 are provided at the raised rear end 112 and extending from the first and second side walls 102, 104 respectively, for attaching a module handle 144 to the module housing 100.
As pointed out above, the module housing 100 is the main structure of the all-in-one CRU or process cartridge module 44, and importantly supports all other subassemblies (cleaning subassembly 80, charging subassembly 76, developer subassembly 78, and sump subassembly 82) of the all-in-one process cartridge module 44. As such, it is designed for withstanding stresses due to various dynamic forces of the subassemblies, for example, for providing a required re-action force to the developer subassembly 78. Because it is located just about 3 mm below the fuser module 46, it is therefore made of a plastic material suitable for withstanding relatively high heat generated from the fuser module. Mounts (not shown) to the developer subassembly within the trough portion of the module housing subassembly are located such that the top wall 106 of the module housing defines a desired spacing comprising the first light path 122 between it and the top 146 of the developer subassembly. Similarly, the raised rear end 112 of the top wall 106 of the module housing is also such as to define a desired spacing between the charging subassembly 76 and the photoreceptor or drum 84, when both are mounted to the raised rear end 112 of the module housing 100. Additionally, the module housing 100 provides rigidity and support to the entire process cartridge module 44, and upon assembly mutually self-aligns the CRU or process cartridge module 44 relative to abutting modules such as the CIM 22, and ECS/PS module 30.
Referring in particular to FIG. 2, the first side wall 102 includes electrical connectors 148, 150 for supplying power from the ECS/PS module 30 (FIG. 1) via the sump subassembly 82 to the charging subassembly 76. It also includes an electrical connector 152 for supplying an electrical bias to the developer subassembly 78, as well as an alignment member 154 for aligning the detack device 68 (FIG. 1) to the photoreceptor. As also shown, the first side wall 102 further includes an apertured retainer device 156 for receiving an electrical grounding pin 160 for the photoreceptor 84. Importantly, the first side wall 102 further includes mounting members 162, 164, 166 for mounting the sump subassembly 82 to the module housing 100, and an opening for mounting an auger 170 of the cleaning subassembly 80 (FIGS. 1 and 5). The opening 168 also passes waste toner received from the photoreceptor 84 in the raised rear end 112, into the sump assembly 82, when mounted as above.
Referring now to FIG. 3, the developer subassembly 78 of the process cartridge module 44 is illustrated with an expandable bottom member 172 unattached in order to reveal the inside of the developer subassembly. As shown, the developer subassembly 78 comprises a generally rectangular developer housing 174 having the bottom member 172, the top 146, a first side 176, a second and opposite side 178, a front end 180 (relative to cartridge insertion), and a rear end 182. The developer housing 174 is for containing developer material, such as, single component magnetic toner (not shown), and it additionally houses the magnetic developer roll 92 (FIG. 1), a development bias application device 184, and a pair of developer material or toner agitators 186, 188.
As shown in FIG. 4, the developer subassembly 78 is mounted to the module housing 100, and inside the trough region 118. With the bottom member 172 of the developer housing removed (for illustration purposes only), the agitators 186, 188 can clearly be seen. Also shown in FIG. 4 are the photoreceptor or drum 84 mounted within the raised rear end 112 of the module housing 100, as well as, the module handle 144 attached to the side walls 102, 104 at the raised rear end 112. The whole sump subassembly 82 is further shown with an outside surface 190 of its inside wall 192, mounted to the first side wall 102 of the module housing 100. The outside surface 194 of the outside wall 196 of the sump assembly is also clearly visible. The inside wall 192 and outside wall 196 partially define the sump cavity (not shown) for containing received waste toner, as above.
Referring now to FIG. 5, there is presented an exploded perspective view of the various subassemblies, as above, of the CRU or process cartridge module 44. As shown, the module handle 144 is attachable to mounting members 140, 142 at the raised rear end 112 of the module housing 100, and the sump subassembly 82 is mountable to the first side wall 102 of the cartridge housing. The developer subassembly 78 is mounted within the trough region 118 of the module housing 100, and is partially visible through the first cutout 120. Advantageously, the developer subassembly fits into the trough region 118 such that the top 146 (FIG. 3) of the developer subassembly and the inside of the top wall 106 of the module housing define the first light path 122 for the exposure light 88 from the ROS 38 (FIG. 1). As also shown, the charging subassembly 76 is mountable, at the second cutout 124, to the module housing 100, and includes a slit 198, through the charging subassembly, that defines part of the second light path 126 for the erase light 128 to pass to the photoreceptor 84.
Referring next to FIG. 6, a vertical (rear-to-back) section of the CRU or process cartridge module 44 as viewed along the plane 6--6 of FIG. 5 is illustrated. As shown, the developer subassembly 78 is mounted within the trough region 118 of the module housing subassembly 72 as defined in part by the front end wall 116, the second side wall 104, and the top wall 106 of the module housing subassembly. The module handle 144 as attached to mounting members 140, 142, (only one of which is visible), forms a portion of the sheet or paper path 98 of the machine 20 (FIG. 1) by being spaced a distance 200 from photoreceptor 84 in the raised rear end 112 of the module housing 100. The photoreceptor or drum 84 is mounted to the side walls 102, 104, (only one of which is visible), and as shown is located within the raised rear end 112 and is rotatable in the direction of the arrow 86. The charging subassembly 76 is mounted within the second cutout 124 in the top wall 106 and includes the slit 198 defining part of the second light path 126 for erase light 128 to pass to the photoreceptor 84. Upstream of the charging subassembly 76, the cleaning subassembly 80, including the cleaning blade 138 and the waste toner removing auger 170, is mounted within the raised rear end 112, and into cleaning contact with the photoreceptor 84. As further shown, the top wall 106 of the module housing 100 is spaced from the top 146 of the developer subassembly 78, thus defining the part of first light path 122 for the exposure light 88 from the ROS 38 (FIG. 1). The first light path 122 is located so as to be incident onto the photoreceptor at a point downstream of the charging subassembly 76.
The front 180, top 146, and bottom member 172 of the developer subassembly define a chamber 202, having an opening 204, for containing developer material (not shown). The first and second agitators 186, 188 are shown within the chamber 202 for mixing and moving developer material towards the opening 204. The developer material biasing device 184 and a charge trim and metering blade 206 are mounted at the opening 204. As also shown, the magnetic developer roll 92 is mounted at the opening 204 for receiving charged and metered developer material from such opening, and for transporting such developer material into a development relationship with the photoreceptor 84.
According to the present invention and referring now to FIG. 6, a molded cantilevered spring 300 is shown in process cartridge 72. The spring 300 is used to urge development cartridge 78 into rotation in a clockwise direction as shown in arrow 306. The spring 300 thus assists in urging development roll 92 against the photoconductive drum 84, The development cartridge 78 is thus pivotably mounted at pivot point 314 to the process cartridge 72.
While the invention may be practiced with a solitary spring 300, preferably to provide a more uniform pressure for the developer roll 92 against the photoconductive drum 84, the process cartridge 72 includes two spaced apart springs 300 positioned near opposed ends of the development cartridge 78 as shown in FIG. 9.
Referring to FIG. 9, the process cartridge pivots about pivot point 314 causing development roll spacers 316 which are positioned on opposed ends of the developer roll 92 into contact with the outer periphery of the photoconductive drum 84.
Referring now to FIG. 7, the spring 300 is shown in greater detail. While it should be appreciated that the molded cantilevered spring may be a separate element or subassembly which may be mounted to the process cartridge 72, preferably, the molded cantilevered spring 300 is integrally molded with process cartridge housing 320. By integrally molding the molded cantilevered spring 300 with the cartridge housing 320, the spring may be provided at a negligible cost and the spring 300 will require no assembly whatsoever.
The molded cantilevered spring may be made of any suitable durable moldable material capable of generally resilient deflection. For example, the spring may be made of a polycarbonate or a glass filled polycarbonate. Alternatively, the spring may be made of high impact polystyrene.
As shown in FIG. 7, the molded cantilevered spring extends inwardly from inner surface 322 of cartridge housing 320 and includes distal end 324 which mates with developer housing 174 at, for example, slot 330.
Referring now to FIG. 8, the spring 300 is shown in greater detail. The spring 300 may have any suitable shape such that it cantilevered or extends in a beam-like fashion from the cartridge housing 320. To provide for a contact at distal end 324 of the spring 300, the spring 300 preferably has a shape in which the distal end 324 protrudes downwardly from the remainder of the spring 300.
For example, as shown in FIG. 8, the spring 300 has a first horizontal section 332 which extends outwardly in a horizontal direction from the cartridge housing 320. The first horizontal section 332 has a length L.sub.1, of, for example, 0.5 inches. The spring 300 may also have a first vertical portion 334 which extends downwardly from the first horizontal portion 332 a distance L.sub.2 of, for example, 0.50 inches. Extending outwardly from the distal end of the first vertical portion 334 of the spring 300 may be a second horizontal portion 336 which has a length L.sub.3 of say for example 1 inch.
A protrusion portion 340 may extend downwardly from the distal end of the second horizontal portion 336 of the spring 300. The protrusion portion 340 includes the distal contact portion 324. The spring does have an effective length L.sub.E for approximately 2.0 inches. The spring 300 may have any shape but for simplicity, may have a generally rectangular cross section including a thickness T of say approximately 0.5 inches.
Referring again to FIG. 6, the development cartridge 78 has a center of mass 339 when the cartridge 78 is full of toner, having a weight of for example 0.60 kilograms, which is spaced a distance R.sub.2 from the pivot point 314 of the cartridge 78 of for example 40 mm. Also the development cartridge 78 has a center of mass 338 when the cartridge 78 is empty, having a weight of for example 0.22 kilograms, which is spaced a distance R.sub.1 from the pivot point 314 of the cartridge 78. This weight change affects the force of the development roll spacer against the photoconductive drum. This force can be determined as follows;
For a full toner container:
Summing the moments about pivot point 314:
.SIGMA. moments=0
or FRD.times.R.sub.4 -W.sub.2 .times.R.sub.2 .times.sin .beta.-K.DELTA..times.R.sub.3 sin .theta.=0
or FRD.times.R.sub.4 =W.sub.2 .times.R.sub.2 .times.sin .beta.+R.sub.3 .times.K.DELTA. sin .theta.
or FRD.times.R.sub.4 =R.sub.3 .times.K.DELTA. sin .theta.+W.sub.2 .times.R.sub.2 .times.sin .beta.
or FRD=(R.sub.3 .times.K.DELTA. sin .theta.+W.sub.2 .times.R.sub.2 .times.sin .beta.)/R.sub.4
where:
W.sub.2 =weight of a full toner container
R.sub.2 =distance form the pivot point to the center of mass of a full toner container
.beta.=angle from vertical of the pivot point to the center of mass of a full toner container
K=spring force
.DELTA.=spring deflection
R.sub.3 =distance from the pivot point to the spring
.theta.=angle from vertical of the pivot point to the spring
R4=distance from the pivot point to the contact point between the development roll spacers 316 and the photoconductive drum 84
FRD=force of the development roll spacers against the photoconductive drum.
For an empty toner container:
Summing the moments about pivot point 314:
.SIGMA. moments=0
or FRD.times.R.sub.4 -W.sub.1 .times.R.sub.1 .times.sin .alpha.-K.DELTA..times.R.sub.3 sin .theta.=0
or FRD.times.R.sub.4 =W.sub.1 .times.R.sub.1 .times.sin .alpha.+R.sub.3 .times.K.DELTA. sin .theta.
or FRD.times.R.sub.4 =R.sub.3 .times.K.DELTA. sin .theta.+W.sub.1 .times.R.sub.1 .times.sin .alpha.
or FRD=(R.sub.3 .times.K.DELTA. sin .theta.+W.sub.1 .times.R.sub.1 .times.sin .alpha.)/R.sub.4
where:
W.sub.1 =weight of a empty toner container
R.sub.1 =distance form the pivot point to the center of mass of an empty toner container
.alpha.=angle from vertical of the pivot point to the center of mass of an empty toner container
K=spring force
.DELTA.=spring deflection
R.sub.3 =distance from the pivot point to the spring
.theta.=angle from vertical of the pivot point to the spring
Thus, as the toner is consumed in the development cartridge ,78 the force against the photoconductor decreases. Also over time the spring constant k on the spring decrease due to creep of the plastic material. The reduction in force of the spring force over time is minimal compared to the decrease in the force against the photoconductor due to loss of toner weight so that the combination of the spring force and the weight of the developer unit, even when the developer unit is empty of toner, against the photoconductor remains sufficient to facilitate development. In fact, the applicants have found that the creep of the spring is so slow that the development unit may be refilled several times before the spring creep is too great.
Referring now to FIG. 10, a printing machine 20 capable of utilizing the multi-cantilevered spring of the present invention is shown.
By providing a printing machine including a pivotable development cartridge urged by a molded cantilevered spring, a costly assembly of separable metal springs is avoided.
By providing a printing machine, including a developer cartridge which is rotatably urged by a molded cantilevered spring, the costs of a separate spring can be eliminated. By providing a printing machine including a process cartridge housing having an integrally molded spring a process cartridge may be provided which does not have the assembly errors and quality problems of a separate spring which must be assembled into the cartridge.
While this invention has been described in conjunction with various embodiments, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.

Number	Name	Date
4556308	Hoppner et al.	Dec 1985
4563074	Tsutsui et al.	Jan 1986
4809033	Ikemoto et al.	Feb 1989
4987446	Mochimaru et al.	Jan 1991
5089849	Hiraoka	Feb 1992
5450166	Yashiro	Sep 1995
5581328	Yashiro	Dec 1996

Number	Date	Country
62-260166	Nov 1987	JPX
63-247763	Oct 1988	JPX

Printing cartridge with molded cantilever developer roller spacing spring

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