MXPA97004099A - Machine for production of documents that has a assembly for feeding leaves with cartridge tray of high capacity, high reliabili - Google Patents

Abstract

The present invention relates to a document production machine that uses sheets to produce image originals, the document production machine is characterized in that it comprises: (a) a machine structure, (b) an image forming means mounted on the machine structure and including a marking material to form a visible image on a sheet; (c) a cartridge receiving aperture defined within a portion of the machine structure to receive a tray unit in a removable manner; cartridge that supports a high-capacity sheet stack, and (d) a high-capacity, high-capacity cartridge sheet supply unit mounted on the cartridge receiving opening, the sheet supply unit for The cartridge tray includes: (i) a cartridge frame that has a front end to feed sheets into the machine, and a base plate Fixed, stationary position to support a high capacity sheet stack, (ii) a mobile front supply corner cushion, mounted on a corner of the front end to prevent multiple sheet supply in a single time, the shock absorber of movable corner is mounted to move with a height of a stack of sheets, and (iii) a pivoting mobile supply wheel unit including supply wheels positioned relative to the movable corner cushion to supply the machine, with a high degree of of reliability within the machine, a top sheet of a stack of sheets held in the base plate in a fixed position, the mobile wheel supply unit mounted by pivots has a first position defined by the top of a complete stack of sheets in the fixed position of the base plate and a second position defined by the base plate of fixed position and a lifting mechanism connected with the structure of the machine for moving the supply wheels back and forth between the first and second positions thereof, the lifting mechanism includes a drive unit mounted on the structure of the machine and coupled with lifting bars to move the bars elevators on a pivot point, and the drive unit includes a return spring clutch for selectively controlling a driving movement of the drive unit on an arrow of the supply wheels.

Description

MACHINE FOR PRODUCING DOCUMENTS THAT HAVE A ASSEMBLY FOR FEEDING LEAVES WITH HIGH CAPACITY CARTRIDGE TRAY, HIGH RELIABILITY IDE BACKGROUND OF THE INVENTION This invention relates to machines for production or reproduction of documents in general, particularly to the machine that has a assembly for sheet feeding with high capacity cartridge tray, high reliability, to maintain a stack of high capacity sheets, and to feed these sheets with a high degree of reliability in the machine. Document production machines include all types of printers, as well as reproduction machines @ with electrostatic process. In general, the process of the electrostatic reproduction machines includes charging to a substantially uniform potential an image frame of a photoconductive member in motion or photoreceptor, and downloading as an image or exposing it as an image to the light reflected from an image. original that is reproduced. The result is a latent image formed electrostatically in the image frame of the photoconductive member. For multiple original images, several of these pictures are similarly imaged. The latent image thus formed in each frame is revealed by carrying a charged developer material in contact with REF: 24489 it. Commonly, two component, single component developer materials are used. A typical two-component developer material comprises magnetic carrier particles also known as "carrier beads" that have functionally charged functional pigment particles that adhere triboelectrically. A single component developer material typically comprises only charged organic pigment particles. In any case, the meltable charged organic pigment particles when contacted with each latent image are attracted to that image, thereby forming an organic pigment image on the photoconductive member. The organic pigment image is subsequently transferred in a transfer station to a copy or image receiver sheet. The copy sheet is then passed through a merger apparatus, where the organic pigment image is heated and permanently fixed to the copy sheet, thereby forming a solid copy of the original image. The copy sheets are typically kept and placed (to feed the transfer station) in a mounting assembly for motorized lift sheets within the machine, or in a removable or portable non-motorized pivot and spring cartridge tray assembly, which cooperates with a feed wheel assembly with fixed position.

Conventional known non-motorized spring-loaded and pivoting cartridge-type tray or tray assemblies of this type are well known. Typically, front-end braking drum type drum tray, cooperate with a fixed-position feed wheel assembly, can reliably hold and feed only up to a maximum of 250 sheets per complete tray on high-speed reproduction machines. image. The following patents describe examples of these cartridge trays. The U.S. Patent No. 4,591,141 with title "First Point Sheet Feeder" describes a sheet feeder that is pivotably mounted, so that the paper supply is kept in contact with a fixed position feed roller. The pivot point of the sheet feeder is chosen to provide constant feed pressure to the paper supply, regardless of the size of the remaining paper. The U.S. Patent No. 4,358,102 titled "Copy Paper Feeding Cassette" describes a cartridge having a cut or gate defined centrally on each wall of the cartridge. The cartridge also has a reinforcing plate pivotally mounted to a front portion of each side wall. When mounting on a machine, the reinforcement plates bridge the cuts or door and cooperate with the machine members to avoid biased feeding of a higher blade. The U.S. Patent No. 3,599,972 titled "Paper Tray for Photocopy Machine" describes a floating feed tray including a pair of feed rollers placed on the front end of the tray and mounted on a fixed shaft. The trailing end of the tray is directed downward to pivot the tray relative to a pivot point, so as to raise the front end to bring the uppermost sheet in feed coupling with the feed rollers. JP 47-146600 (canon KK) September 9, 1964, Utility Model, discloses a paper feed cartridge that includes a brake drum or sheet separator pivot that is displaced from the paper feed position, when the sheets are load. The U.S. Patent No. 3,408,064 entitled "Auxiliary Paper Tray for Copying Machine" (auxiliary paper tray for copying machines) discloses a paper tray having guides or side and end walls that are fixedly connected to the bottom plate of the tray for accommodate a stack of leaves.

As illustrated in Figures 1 and 2 of the drawings, these conventional, non-motorized, removable cartridge tray assemblies, for example, those having forward or advancing feed corner braking drums cooperating with a feed roll of Fixed position, they are very sensitive to the blade feeding angle dependent on the stack height. The blade feed angle is defined by the top of a stack of sheets relative to a horizontal plane through the corner braking drum. They are also very sensitive to variations in the normal force acting through the attachment point of the blade feed. Variations in the feed angle of the blade also adversely affect the length FLI, FL2 or amount of each sheet fed by feed path or feed cycle of the leaf wheel to full and nearly empty states of the cartridge tray. Still with reference to Figures 1 and 2, a conventional cartridge tray assembly 200 is illustrated in the entire portion (Figure 1) in the nearly empty position (Figure 2). The conventional cartridge tray assembly 200, has a one-piece base plate 202 that is pivotally mounted in a cartridge frame 74. The base plate 202 is supported by a pressure spring 226 toward its front end, below a roller or fixed position rotatable feed wheel 33. As illustrated, the uppermost sheet in the stack has a plane 212 when the springs 226 are compressed by the feed wheel 33 during a feed path. The compressed spring pushes up on the pivotally movable baseplate, applying a force normally upwards Pl at the sheet feeding fastening point, when the baseplate has a full stack of sheets on top. The net force Pl is the difference between the maximum spring force 226 and the weight of the stack of sheets in the base plate 202. Accordingly, when the base plate is nearly empty with almost no weight a stack of sheets acting down in the spring, a larger net normal force P2 will act and push upward at the blade feed fastening point. This variation in normal force contributes to poor reliability of a conventional cartridge tray assembly in sheet feeding. Additionally as illustrated, the sheet feed angle Fl ° measured as the angle between the top of a stack of sheets and a horizontal plane through the corner brake drum is approximately 2 °, when the cartridge tray is full . Conventional filled cartridge trays (Figure 1) with a small sheet feeding angle Fl ° of approximately 2 *, therefore work more reliably and effectively than partially filled or almost empty ones (Figure 2) where a feeding angle of larger leaves F2"undesirably has increased substantially by more than 9 ° to about 11.3 °. This variability in both the leaf feeding angle and the normal force at the point of attachment of the leaves, are significant factors that limit undesirably the sheet holding capacity, and the reliability of sheet feeding in conventional, non-motorized, drum-type drum cartridges trays, so there has been a need for a drum-type cartridge tray assembly for braking cost Relatively low and highly reliable, it can hold and stand as well as reliably feed from stacks of leaves greater than maximum of 250 sheets ordinarily limited. SUMMARY OF THE INVENTION According to the present invention there is provided a highly reliable, high capacity cartridge tray sheet feeding assembly for supporting a stack of high capacity sheets, and for feeding those sheets with a high degree of reliability, one at a time in a machine that uses leaves. The assembly for feeding cartridge tray sheets with high capacity, high reliability, includes a cartridge frame to remove and reinstall in a sheet supply station of the machine that uses the sheets. The cartridge frame has a front end on which the blades are fed into the machine, and a front-feed corner braking drum, which is mounted to a corner of the front end of the cartridge frame, to prevent multiple feedings. leaves at a time. The cartridge frame includes a stationary base plate of fixed position within the cartridge frame, to support a stack of high capacity sheets having a more upper sheet. The high-capacity cartridge tray sheet feeding assembly, high reliability, further includes a variable-position-sheet receiving path, and a pivotable feed wheel assembly, to reliably feed the uppermost sheets in series from the base plate Stationary position fixed towards the path of variable position sheets. The pivotable feed wheel assembly has a first position, for a complete stack of sheets, and a second position for an empty base plate. Importantly, the pivotable feed wheel assembly has a constant blade feed angle, and a constant sheet feed force, to allow highly reliable continuous sheet feeding from the first to the second position.

BRIEF DESCRIPTION OF THE DRAWINGS In the detailed description of the invention presented below reference is made to the drawings in which: Figures 1 and 2 are schematic of trays of conventional type cartridges (fixed position feed wheels) and pivoting base plate ( which show variable blade feed angles and normal variable blade feed forces in the full and near empty states, respectively; Figure 3 is a schematic illustration of the sheet feed assembly with high capacity cartridge tray, high reliability the present invention, which shows a constant sheet feed angle and a constant normal force at the sheet feed point in both the full and empty states of the cartridge tray, Figure 4 is a schematic plan view of the sheet feeding with high capacity cartridge tray, high reliability of the present invention Figure 5 is a schematic vertical view of the sheet feed assembly with cartridge tray of Figure 1, on view plane 5-5, showing the sub-assemblies of stationary base plate of fixed position and pivoting feed wheel of Figure 4: Figure 6 is a schematic vertical view of the sheet feed assembly with cartridge tray of Figure 1, on view plane 6-6 showing the pivoting feed wheel assembly and stationary position base plate fixed of Figure 4; Figure 7 is a schematic vertical view of the sheet feed assembly with cartridge tray of Figure 4, on the plane of view 7-7 showing the pivoting feed wheel assembly and fixed position stationary base plate of Figure 4; and Figure 8 is a vertical schematic of an exemplary electrostatic reproducing machine that includes high sheet, high capacity cartridge sheet feed assembly, high reliability in accordance with the present invention. 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 that may be included within the spirit and scope of the invention as defined by the appended claims. First with reference to Figure 8, there is illustrated a document production machine in the form for example of an exemplary electrostatic reproduction machine 8 according to the present invention. As shown, the machine 8 has associated conventional imaging processing stations, including an AA charging station, an image forming / exposure station BB, a DC developing station, a DD transfer station, a fusing station EE, a cleaning station FF. Importantly, the machine 8 includes a sheet supply station generally illustrated as GG, which includes a high-reliability, non-motorized, high capacity, cartridge-feed sheet assembly of the present invention (which will be described in detail then) . The sheet supply station GG can advantageously also include a conventional braking drum cartridge tray assembly illustrated as 200. As shown, the machine 8 has a photoconductive strip 10 with a photoconductive layer 12, which is held by a impulse or displacement roller 14 and a tension roller 15. The impulse roller 14 functions to move the band in a direction indicated by arrow 18.

The driving roller 14 itself is moved by a motor (not shown) by convenient means, such as a pulse band. The operation of the machine 8 can be described briefly as follows. Initially, the photoconductor band 10 is charged to the AA charging station by a corona generating device 20. The loaded portion of the web is then transported by the driving roller 14 to the image forming station BB, wherein a latent image is formed in the band 10 corresponding to the image in a document placed on a platen 24 by the image forming system with light lenses 28, of the image forming / exposure station BB. It will also be understood that the light lens image formation system can be easily changed to a feed / output scan terminal to an output scan terminal displaced by a similar image data feed signal in the band 10. As is also well known, the document on the platen 24 can be placed there manually or can be fed automatically by an automatic document handler device 25 which includes a tray for holding multiple document sheets 27.

The portion of the web 10 containing the latent image is then transported to the developing station CC, wherein the latent image is revealed by an electrically charged organic pigment material from a magnetic developer roller 30 of the developing station CC. the image developed in the web is then transported to the transfer station D, where the organic pigment image is transferred to a copy sheet fed from a sheet cartridge tray, for example from the sheet feed assembly with tray High capacity, high reliability cartridge 70, 72 of the present invention (which will be described in detail below). As illustrated, the sheets thus fed are removed by a copy handling system 31 for transport to the transfer station DD. In the transfer station DD a corona generator device 32 is provided to load the copy sheet to bring the image of organic pigment charged from the photoconductive strip 10 to the copy sheet. The sheet copied with the transferred image is then directed to the splicing station EE. The fusing apparatus in the station EE includes a heated fusing roll 34 and a backup pressure roller 36. The heated fusing roll 34 and the pressure roller 36 cooperate rotationally to fuse and fix the image of the pigment on the copy sheet. The copy sheet then, as is well known, can be selectively transported to the finishing area or to a duplex tray 40 on a selectable duplex path 42 for duplexing. The portion of the web 10 from which the developed image is transferred is then advanced to the cleaning station FF, where residual organic pigment and charge in the web are removed by a cleaning device such as a blade 44 and a lamp discharge (not shown) in order to prepare the portion in order to prepare the portion for a subsequent image formation cycle. When duplex image formation is not performed, or at the end of this duplex image formation, the copy sheets upon finally leaving the fusing rollers 34, 36, are passed to the finishing area feed rollers 46 and 48. Of the feeding rollers 46, 48 the sheets copies are fed, for example individually to an output tray (not shown) or to a hopper sorting apparatus 50, wherein the sheets can be arranged in a non-stapled assembly nested within the tray or within of each hopper 52 of the hopper sorter apparatus. The hopper sorting apparatus 50 can comprise any amount of hopper 52. A machine user that this set of sheets copies on the reproduction machine 8, in this way can manually remove each set at a time and insert a corner or edge of the assembly in a convenient stapler assembly 60, which is constructed in a position 62 of the machine frame 8. Now with reference to Figures 3 to 7, the sheet-feed assembly with high-capacity cartridge tray, high reliability 70 , 72 of the present invention is illustrated in detail. The sheet feed assemblies with cartridge tray 70, 72 in general and conceptually are identical in design and operation except that the assembly 70 is adapted to feed sheets first on the short side, and the assembly 72 is adapted to feed sheets with the long edge first. Therefore, a detailed description of the concepts of 70 will suffice for 72. As illustrated in Figures 3 and 4, the cartridge tray feed assembly 70 of the present invention includes a cartridge 73 having a frame 74 which can be removed and reinstalled in the GG sheet supply station of the machine 8. The cartridge frame 74 as is well known can be a portable frame member that contains a single cartridge tray and can be completely removed from the station for sheet supply placed on a platform to be replenished with sheets and then reinstalled at the supply station. In alternate form, as illustrated (Figure 8) the cartridge frame 74 may be part of a multi-tray tray frame, which usually holds more than one removable non-motorized cartridge tray. The drawer frame is retracted from the sheet supply station for sheet replenishment, and is re-installable in a sheet feed position within the sheet supply station of the machine. The cartridge frame 74 in any case has a front or feed base 76 (for sheets fed by the short edge) on which the sheets are fed, one at a time, to the sheet handling apparatus 31, of the image transfer station DD of the machine 8. The front end 76 has a front power corner braking drum 80 mounted in a corner of this front end 76, such that it is movable up and down, and more importantly, is automatically movable downwardly. with the top of a stack of sheets in the cartridge tray 73, to avoid feeding multiple sheets at once. The front end 76 also includes a first sheet guide wall 84 for supporting the leading edges of a stack of sheets advantageously relative to the corner braking drum 80. According to the present invention, the front wall 84 is made movable upwards and down with the corner braking drum 80. The movable corner braking drum 80 is mounted, for example in a side wall of the cartridge frame 74 (Figure 5) to move up and down, in a position constant relative down to a height of a stack 94 of the sheets in the tray 73. The cartridge frame 74 also includes a rear end 88 having a second sheet guide wall 90. The second sheet guide wall 90 is adjustable towards back and forward, to allow the handling of a stack 94 of sheets, of various lengths, such as letter-length and legal-size length sheets. Importantly, however, the first and second walls 84, 90 in this manner cooperate in each cartridge tray 73 to place the leading edge of each sheet of the stack 94, at a constant position relative to the corner braking drum. front feed 80. Additionally, in accordance with the present invention, the cartridge frame 74 includes a stationary, stationary base plate 96 for supporting a high capacity stack 94 of more than 250 sheets. More importantly, the high-capacity, high-reliability cartridge feed sheet assembly 70 of the present invention further includes a pivotally movable feed wheel assembly 100 having at least one pair of feed wheels 102 positioned thereon. to the mobile corner braking drum 80 for feeding with a high degree of reliability in the machine, a top sheet SS of a stack of sheets held in the base stack of fixed position 96. To cooperate with the pivotable feed wheel assembly of 100, the sheet-feed assembly with high-capacity cartridge trays, high reliability 70, advantageously includes path means 104 that define a variable-position blade path 106 that leads from the feed wheels 102 to the machine 8. Path means 104 as illustrated (Figure 4) include upper rollers for sheet removal with dot stitching. and securing 108 and lower rollers 110. It also includes upper and lower blade guides 112, 114, respectively, which are pivotally mounted relative to the lower rollers that remove the blade 110. The pivotably movable feed wheel assembly 100, has a pivot point 116 and a first position PL1, defined by an upper part of a stack 4 completely of sheets (Figures 3, 5 and 7). It also has a second position PL2 defined by the fixed position base plate 96. A pulse assembly 120 mounted on the frame 116 of the machine for moving and moving the feed wheel assembly between the first and second positions PL1, P12 respectively. The feed wheels 102 of the feed wheel assembly 100, when moving from the first position PL1 to the second position PL2, have a constant sheet feed angle F3 ° defined by a top sheet to be fed, and a horizontal plane through of the mobile corner braking drum 80, to allow continuous high reliability feeding of sheets to the machine. The feed wheels 102, when moved as such, also have a constant sheet feed force P3 which acts on a stack of sheets in the base plate 96, to further allow a high continuous reliability feed of sheets to the machine. According to one aspect of the present invention, weight-supporting means 122 are connected to the arrow 124 of the feed wheels 102 to support selectable weights. Accordingly, a selectable weight 126 can advantageously be added to the support means 122, to change a value of the constant value force P3 acting on the stack of sheets. The feed wheel assembly 100 as illustrated, includes a lifting mechanism 130 which is mounted on the machine frame 116, and which engages the feed wheel shaft 124 to move the feed wheel 102 pivotally forward and forward. backward between the first and second positions PL1 and PL2, respectively. The lifting mechanism 130 includes pivotable lifting bars 132 which advantageously have a pivot point PV that is spaced at a convenient distance LD from the front end 76 of the cartridge frame 74 to maintain the constant sheet feed angle F3 ° of the present invention. . Additionally, the lifting mechanism 130 includes a displacement assembly 140 that is also mounted on the machine frame 116, as well as engages the lifting rods 130 to move the lifting rods pivotally relative to the pivot point PV. The pulse assembly 140 includes a pulse belt 142 for moving the feed wheel arrow 124, and a coiled spring clutch 144, which allows coupling and detachment of the impulse movement to the arrow 124. A control collar 146 mounted on the coiled spring clutch 144 is engaged and released by a ratchet 148 which is operable by a solenoid switch 150 to activate and deactivate the rotation of the arrow 124. The feed wheels 102, each being a segmented roller, and selectively move through the solenoid and coil spring controls as before, through a feed cycle or feed stroke such that the uncut portion of the circumference of each wheel is in contact with a fed SS sheet. the feed wheels 102 are pivotally mounted as such, in order to have a changing path 152 of movement with respect to the front end 76 of the cartridge frame 74. To recapitulate, a production machine has been provided in accordance with the present invention. documents that uses sheets to produce physical copies of images. The document production machine includes a machine frame, image forming means mounted on the machine frame and including marking material to form a visible image on a sheet, and a cartridge receiving aperture defined within a portion of the machine frame for removably receiving a suitable cartridge tray assembly to support a stack of high capacity sheets. The document production machine also includes the pivotably movable feed wheel assembly for feeding with a high degree of reliability from a base plate cartridge tray with fixed position that is removably inserted into the cartridge receiving aperture. The cartridge tray has the fixed position base plate and the pivotably movable feed wheel assembly comprising the sheet feed assembly with high capacity cartridge tray, high reliability of the present invention, which fully satisfies the objectives and advantages previously established.

While the invention has been described in conjunction with a specific embodiment thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to encompass all these alternative modifications and variations that fall within the spirit and broad scope of the appended claims. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, the content of the following is claimed as property:

Claims (13)

1. CLAIMS 1.- A document production machine that uses sheets to produce physical copies of images, the document production machine is characterized in that it comprises: (a) a machine frame; (b) image forming means mounted on the machine frame and including marking material to form a visible image on a sheet; (c) an aperture for cartridge reception defined within a portion of the machine frame, for removably receiving a cartridge tray assembly supporting a stack of high capacity sheets; and (d) a high-capacity, high-reliability cartridge feed assembly mounted on the cartridge receiving opening, the sheet-feed assembly with cartridge tray includes: (i) a cartridge frame that a front end for feeding sheets in the machine, and a stationary fixed position base plate for supporting a stack of high capacity sheets; (ii) a feed-forward corner braking drum, mounted on a corner of the front end to prevent feeding multiple sheets at once, the moving corner braking drum is mounted to move relative to a stack height of leaves; and (iii) a pivotally movable feed wheel assembly, including feed wheels positioned relative to the movable corner braking drum for feeding, with a high degree of reliability in the machine, a top sheet of a stack of sheets held on the fixed position base plate.
2. 2. The document production machine according to claim 1, characterized in that it includes path means that define a path of variable position blades from the wheels feeding the machine.
3. 3. The machine for production of documents according to claim 1, characterized in that the marking material of the image forming means comprises charged organic pigment particles.
4. 4. The document production machine according to claim 1, characterized in that the mobile feed wheel assembly pivotably has a first position defined by the upper part of a complete stack of sheets, in the base plate of fixed position, and a second position defined by the fixed position base plate.
5. 5. The document production machine according to claim 2, characterized in that the path means include upper rollers for extracting clamping point and lower rollers, and upper and lower leaf guides mounted pivotally with respect to the rollers. lower to extract leaves.
6. 6. - The document production machine according to claim 4, characterized in that the feed wheels in the feed wheel assembly move from the first position to the second position of the feed wheel assembly, have a feed angle of Constant blades defined by a top blade that feeds and a horizontal plane through the mobile corner braking drum, to allow continuous high reliability feed of the blades to the machine.
7. 7. The document production machine according to claim 4, characterized in that the feed wheels in the feed wheel assembly, when moving from the first position to the second position of the feed wheel assembly, have a normal force Constant sheet feeding that acts on a stack of sheets on the fixed position base plate, to allow continuous high reliability feed of the sheets to the machine.
8. 8. The document production machine according to claim 4, characterized in that the feed wheel assembly includes a lifting mechanism connected to the machine frame to move the feed wheels pivotably back and forth between the first and second. second positions.
9. 9. - The document production machine according to claim 8, characterized in that it includes a selectable weight to change a constant normal force value acting on the stack of sheets, and support means connected to the supply wheels to support the weight selectable
10. 10. The document production machine according to claim 9, characterized in that the lifting mechanism includes pivotable lifting bars having a pivot point spaced a desired distance from the front end of the cartridge frame to maintain the angle of Constant blade feeding of the feed wheels.
11. 11. The document production machine according to claim 9, characterized in that the lifting mechanism includes a pulse assembly placed in the machine frame and coupled in the lifting bars to move the lifting bars with respect to the pivot point. .
12. 12. The document production machine according to claim 11, characterized in that the pulse assembly includes a coiled spring clutch to selectively control the impulse movement of the pulse assembly to an arrow of the feed wheels.
13. 13. - An assembly for feeding sheets with a high capacity cartridge tray, high reliability, to support high capacity sheets stacks, and to feed these sheets with a high degree of reliability, one at a time, in a machine that uses sheets , the assembly for feeding sheets with cartridge tray is characterized in that it comprises: (a) a cartridge frame for removing and reinstalling in a sheet supply station of the machine using sheets, the cartridge frame includes a front end on which leaves are fed to the machine and a stationary base plate of fixed position, to support a stack of sheets, of high capacity having a more upper blade; (b) a feed-forward corner braking drum, mounted in a corner of the front end of the cartridge frame, to avoid feeding multiple sheets at once; and (c) a pivotable feed wheel assembly for reliably feeding the uppermost sheets in series, from a stationary base plate of fixed position; the pivotable feed wheel assembly has a first position defined by an upper part of a complete stack of sheets in the base plate of fixed position and a second position defined by an empty base plate, the pivotable feed wheel assembly has an angle of constant sheet feeding, and a constant sheet feeding force, to allow continuous high sheet reliability feeding, from the first to the second position. SUMMARY OF THE INVENTION The present invention refers to an assembly for feeding sheets with high capacity cartridge tray, high reliability, to support a high capacity stack of sheets, and to feed these sheets with a high degree of reliability, a at the same time, in a machine that uses leaves. The high-capacity, high-reliability sheet-feed tray assembly includes a cartridge frame to be removed and reinstalled in a sheet-feed station of the sheet-fed machine. The cartridge frame has a front end on which sheets are fed to the machine, and a feed-forward corner braking drum that is mounted in a corner of the front end of the cartridge frame to prevent feeding multiple sheets to the time The cartridge frame includes a stationary base plate of fixed position within the cartridge frame to support a high capacity stack of sheets having a more upper sheet. The sheet feed assembly with high capacity cartridge tray, high reliability also includes a path for receiving variable position sheets, and the pivotable feed wheel assembly for reliably feeding the upper sheets in series, from the stationary base plate of fixed position within the path of variable position sheets. The mounting of pivotable feed wheel wheels has a first position for a complete stack of sheets, and a second position for an empty base plate. Importantly, the pivotable feed wheel assembly has a constant blade feed angle and a normal normal sheet feed force constant to allow high continuous reliability feed of the sheets from the first to the second position.