Source: http://www.google.com/patents/US4538906?dq=U.S.+patent+number+7,325,728&ei=Y93TTteOAe702wW6uqi1BQ
Timestamp: 2014-07-29 21:24:47
Document Index: 770332859

Matched Legal Cases: ['application no. 8226848', 'application no. 8226808', 'application no. 8226848', 'application no. 8226812', 'application no. 8041083', 'application no. 8226819']

Patent US4538906 - Copiers for simplex and duplex copying - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA copier is described which is capable of simplex and duplex copying which includes a photoreceptor (11), first and second copy sheet trays (41 and 42) and a duplex buffer tray (43). A first sheet feeder (46) is associated with the first copy sheet tray (41) and a second sheet feeder (45) is commonly...http://www.google.com/patents/US4538906?utm_source=gb-gplus-sharePatent US4538906 - Copiers for simplex and duplex copyingAdvanced Patent SearchPublication numberUS4538906 APublication typeGrantApplication numberUS 06/617,420Publication dateSep 3, 1985Filing dateJun 5, 1984Priority dateJun 8, 1983Fee statusPaidAlso published asCA1229369A1, DE3474734D1, EP0128727A1, EP0128727B1Publication number06617420, 617420, US 4538906 A, US 4538906A, US-A-4538906, US4538906 A, US4538906AInventorsIan G. BrownOriginal AssigneeXerox CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (17), Classifications (12), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetCopiers for simplex and duplex copyingUS 4538906 AAbstract A copier is described which is capable of simplex and duplex copying which includes a photoreceptor (11), first and second copy sheet trays (41 and 42) and a duplex buffer tray (43). A first sheet feeder (46) is associated with the first copy sheet tray (41) and a second sheet feeder (45) is commonly associated with the duplex buffer tray (43) and the second copy sheet tray (42). The trays (42, 43) are relatively movable for operatively associating them only one at a time with the second feeder (45). A control is provided for selecting sheet feeding from one of the copy sheet trays (41, 42) and further for controlling the trays such that during duplex copying copy sheets are fed only from the first copy sheet tray (41) and only the buffer tray (43) is operatively associated with the common sheet feeder (45).
What is claimed is: 1. In a copier capable of simplex or duplex copying, including a photoreceptor, first and second copy sheet trays, means for feeding copy sheets from said first and second copy sheet trays to said photoreceptor, and a duplex buffer tray, and further including, for said duplex copying, simplexed sheet recirculation means for conveying simplexed copy sheets, which have received an image on only one side at said photoreceptor, to said duplex buffer tray and for refeeding said simplexed copy sheets back from said duplex buffer tray to said photoreceptor to receive a second image on the other sides thereof, the improvement wherein said means for feeding copy sheets comprises a first sheet feeder associated only with said first copy sheet tray and a second sheet feeder commonly associated with both said duplex buffer tray and said second copy sheet tray, and wherein said second copy sheet tray is mounted for movement between a lowered, operative, position in which it is seated within said duplex buffer tray and operatively associated with said second, common, sheet feeder only for simplex copying, and a raised, inoperative, position in which said second copy sheet tray is spaced over said duplex buffer tray and only said duplex buffer tray is operatively associated with said second common, sheet feeder, and wherein said second copy sheet tray is maintained in said raised, inoperative, position during said duplex copying.
2. A copier according to claim 1, in which said first copy sheet tray is movable between an operative position operationally engaged with said first sheet feeder and an inoperative position disengaged from said first sheet feeder, and said first copy sheet tray is maintained in said operative position during duplex copying.
3. A copier according to claim 2, including control means for inhibiting engagement of said first copy sheet tray with said first copy sheet feeder until said second copy sheet tray is disengaged from said second, common, feeder.
This invention relates to copiers capable of simplex or duplex copying and more particularly to such copiers which include a photoreceptor, first and second copy sheet trays, a duplex buffer tray, sheet feeders associated with said trays for feeding sheets from said trays towards the photoreceptor, sheet return means for conveying simplex sheets which have received an image on one side at the photoreceptor to the duplex buffer tray for refeeding to the photoreceptor to receive a second image on the other side, and means for selecting sheet feed from one of said copy sheet trays.
A copier of this general kind is described in British Pat. No. 2033878 which includes a photoreceptor (12), two copy sheet trays (106, 107) and a duplex buffer tray (116). Top sheet feeders are provided for the copy sheet trays (106, 107) and a bottom sheet feeder (124) is provided for the duplex buffer tray (116). In the embodiment illustrated the duplex buffer tray has a false bottom or upper support which enables additional sheets to be fed into the buffer tray beneath those already in the tray as a job recovery feature.
A copier according to the present invention is characterised in that a first sheet feeder is associated with the first copy sheet tray and a second sheet feeder is commonly associated with said duplex buffer tray and said second copy sheet tray, these trays being relatively movable for operatively associating said trays one at a time with said second, common sheet feeder, and means is provided for controlling said trays such that during duplex copying, copy sheets are fed from first copy tray and said buffer tray is operatively associated with said common sheet feeder.
In a preferred embodiment the second copy sheet tray is mounted for movement between a lowered, operative position in which it is seated within the duplex buffer tray and operatively associated with the second sheet feeder and a raised, inoperative position in which it is spaced over the duplex buffer tray and the latter is operatively associated with a second sheet feeder, the second copy sheet tray being in its raised inoperative position during duplex copying.
Suitably the first copy sheet tray is movable between an operative position engaged with its feeder and an inoperative position disengaged from its feeder, engagement of each of the first and copy sheet tray being inhibited unless the other of the trays is disengaged from its feeder.
As seen in FIG. 8, a trigger 147 on the slide 145 actuates paper size sensing switches which are set to commonly used paper sizes. The three switches illustrated will sense paper lengths of 14 inches, A4 and 11 inches. Instead of three switches only two switches may be provided, one indicating 14 inch paper and the other either A4 or 11 inch paper. As described in detail below the width of the copy paper loaded is sensed during the passage of the paper sheets to the registration point 52 by means of a width sensor 71 (FIG. 23) which signals the passing of the sheet lead and trail edges during paper feed.
At the beginning of a print cycle, the machine logic will interrogate the system to determine if any paper is in the paper path. If there is no paper the logic will initiate a signal to the feed clutch, thereby starting the feeder. The nudger wheel 201 will drive the top sheet of paper in stack 200 into the nip between feed belt 202 and retard roll 203. The feed belt is made of soft rubber material with a high friction surface. As the feed belt 202 rotates it drags a sheet of paper from the stack. Frictional forces and static electricity between the sheets of paper in the stack may cause several sheets to move into the nip together.
As mentioned above, the upper tray unit 92 includes the auxiliary tray 42, the duplex buffer tray 43 and the sheet feeder 45. As shown in FIG. 12 the auxiliary tray has a floor 160, a fixed front wall 161 and universally adjustable side and rear walls 162, 163. One end of the rear wall 163 is slidably mounted on the axle 164 about which the auxiliary tray is pivoted and its other end slides on the floor of the auxiliary tray. The side wall 162 which is telescopic extends between sliders 165, 166 mounted on the front wall 161 and the rear wall 163 respectively. A switch 167 actuated by the side guide 162 and sensor switches 168 and 169 actuated by the rear guide 163 are provided to detect commonly used paper sizes (for example the switch 167 may be used to detect A3 size or 17 inch long paper which is fed from the tray short edge first and the switches 168 and 169 may be used to detect 14 inch long and A4 or eleven inch long paper, both of which are fed long edge first).
Sheet separation and acquisition is accomplished by a vacuum belt bottom sheet corrugation feeder (VCF) 45 from both the buffer tray 43 and the auxiliary tray 42 using flotation pressure differences between the bottom sheet and the sheets above, sheet corrugation and vacuum. The floors of the trays 42, 43 interfit and are shaped to form a contour pocket 251 at the lead edge of each tray which is dished down in the manner described for example in our copending United Kingdom patent application no. 8226848 filed 21 Sept. 1982 so that documents placed in the tray bridge this gap and form a flotation pocket. Transport belts 252 surface through the trays within the contour pocket 251. Sheet stack flotation is accomplished by a frontal assault of air from an air knife 253. The air jet impinges on the tray 42 or 43 just in front of the lead edge of the document stack; this permits volumetric flow expansion of air within the pocket of the tray and also riffles the front edge of the sheet stack to allow a differential pocket of air between the bottom sheet and the next sheet. This assists in the acquisition, separation and feeding of the bottom document.
It will be noted that the corrugating rolls 387 are arranged over the air knife 253 and in order to assist sheet entry into the buffer tray the air knife is provided with guide fins 274 on its upper surface. Further, when duplex copying is selected the impeller motor 268 is switched on immediately sheets are fed from the main tray so as to provide an air flow for sheets arriving in the buffer tray as they leave the corrugating rolls so as to assist their delivery against the backstop 182 and at the same time to reduce friction forces which may othewise inhibit proper registration of the sheets. p In a preferred form of the invention the speed of the impeller motor 268 and thus the air knife pressure and acquisition pressure is varied during sheet delivery from the auxiliary tray 42 in dependance upon the height of the stack of sheets. This enables the provision of sufficient air knife pressure to effect the necessary separation of the bottom sheet for thicker stacks without causing violent agitation and a possible blow-away of sheets in thinner stacks. To this end the height of the stack at the beginning of sheet feed from the auxiliary tray 42 is sensed and the motor speed adjusted to one of a number of stepped speeds according to the height of the stack. During consumption of the stack the sheets are counted and at intervals the motor speed is stepped down. A suitable stack height sensor is described in our copending United Kingdom patent application no. 8226808 filed on 21 Sept. 1982 from which it will be noted that in a preferred form a mechanical sensor arm is engaged by the sheet stack in the auxiliary tray 42 when the latter is in its raised position. In this respect it should be noted that in accordance with the machine control procedures the auxiliary tray is always raised to its upper limit position before it is positioned for sheet feeding whenever the front door of the machine has been opened.
As explained above, during sheet feed from the duplex buffer tray 43 the air knife relief valve 271 is opened. The capacity of the buffer tray 43 is less than that of the auxiliary tray 42 and it may in the above example accommodate a maximum of 50 sheets. However, simplex sheets arriving from the photoreceptor 11 and having passed through the fuser 20 tend to be more flacid than virgin sheets as used in the auxiliary tray and often have some degree of curl. For this reason a greater acquisition pressure is required through the vacuum valve 263 than for virgin sheets while the air knife pressure should not be so great as to cause violent agitation of the sheets or indeed since the sheets may be downwardly curled, so great as to press several sheets down at the same time against the belts 252 which may lead to multi-feeds. It is for this reason that the air knife relief valve 271 is provided in the air knife duct so that the acquisition pressure can be correctly balanced against the air knife pressure. Thus in the embodiment described above the impeller motor suitably operates at a fixed speed of 87% of full motor speed during feeding from the buffer tray the air knife relief valve 271 being open. This ensures a higher sheet acquisition pressure and a lower air knife pressure compared with sheet feeding from the auxiliary tray.
As explained above, the lead edges of the sheets to be fed, particularly from the buffer tray 43, may sometimes be curled downwardly causing an increased tendency for the sheets to become shingled because of the increased friction due to the downcurl and because the curl tends to inhibit the flow of air from the air knife 253 between the bottom sheet and the next sheet. As the shingling occurs this latter effect is increased since the lead edges of the sheets approach closer to and may even pass under the air knife. This problem is more pronounced at slower sheet feeds such as those required for feeding documents at a controlled speed to the platen for feeding in constant velocity mode across stationary optics. Where documents can be fed at a higher speed, e.g. where they are copied after registering them on the platen, the problem is less, probably due to the higher inertia.
In order to overcome this problem a pair of ramps 275 are formed at the front end of the support surface at each side of the dished area of the tray. The ramps 275 slope upwardly in the direction of sheet feed and as described in our aforesaid copending United Kingdom patent application no. 8226848 filed 21 Sept. 1982 project forwards beyond the normal lead edge stacking position of sheets in the tray. When a sheet with downcurl is stacked in the tray it has limited beam strength across the tray and such sheets would normlly tend to sag down into the dished area or pocket. The ramps not only raise the lead edges of the sheets above the surface or floor of the tray but may improve the transverse beam strength of the sheet, both of which promote improved air injection.
Sheets from the feeder 45 or 46 are forwarded by the rolls 64, 65 to the registration nip 52. The purpose of registering sheets at the nip 52 is to enable each sheet to be released to the phototreceptor in synchronism with the developed image on the photoreceptor drum. In addition, registration is used to remove any skew from the sheet. The registration system is shown in FIGS. 23, 24 and 25, which show two (or three) registration fingers 301 on either side of registration pinch rolls 302. The pinch rolls 302 are movable into and out of engagement with coating drive rolls 303 and the fingers 301 are movable between an operative position in which their tips 304 project through slots 305 in the outer guide 66 into the sheet path and a retracted position raised out of the sheet path. The pinch rolls 302 and fingers 301 are operated in the following manner. Prior to the arrival of a sheet at the nip 52, the rolls 302, 303 are disengaged and the fingers 301 are moved to their operative positions. A sheet being driven by the upper transport rolls 64, 65 is deflected downwardly by a curved upper portion 72 of the guide 66 against an opposed guide surface 73 (FIG. 23) which directs the lead edge of the sheet into the registration nip and against the tips 304 of the fingers 301. The surfaces 72 and 73 together form a buckle including chamber which enables the sheet to be overdriven against the fingers 301 so as to remove any skew from the sheet without the sheet creasing. Thus the sheet is caused to assume a smooth buckle as shown in FIG. 26. In order to feed the sheet to the photoreceptor 11 the pinch rolls 302 are engaged with the drive rolls 303 following which the registration fingers 301 are retracted. The drive rolls 303 are then energised to feed the sheet in synchronous relation to the developed image on the photoreceptor.
The registration fingers 301 are actuated through a series of linkages by a registration solenoid 317. As the solenoid 317 is energised, cranked arm 318 rotates clockwise (as viewed in FIGS. 23-25) about a fixed axis pivot pin 319 that is mounted on a support 320. At its upper end, the arm 318 carries an actuating pin 321 which moves along a slot 322 in a link 323, causing link 323 to move anticlockwise about the axis of rod 324. Link 323 is fixed to rod 324, so rod 324 also makes an anticlockwise angular movement. This in turn causes the tips 304 of registration fingers 301 to move down through the slots 305 in outer guide 66, and into the paper path. The fingers 301 are spring-loaded as described in our copending United Kingdom patent application no. 8226812 filed 21 Sept. 1982, to allow them to be lowered onto a sheet of paper passing through the registration nips without damaging it.
The paper sheet is driven into the registration position, i.e. with its leading edge in contact with the registration fingers 301, by the upper transport rolls 64, 65 and a small buckle is formed in the sheet by means of the buckle inducer 72, 73. A timed signal from the machine logic then deactuates the solenoid 317 which is returned by the spring 333. As the solenoid deactuates, the pinch rolls 302 close onto the paper, and the registration fingers 301 are then raised from the paper path, allowing the paper to be transported to the photoreceptor as soon as the drive rolls 303 are rotated.
When the first sheet in a sequence is fed from the upper paper tray unit by the sheet feeder 45 the vacuum belts 252 are driven until the lead edge of the sheet is detected by the sensor 48. After a short delay the vacuum belts 252 are reactivated to move the sheet into the take-away rolls 68, 69 for transportation to the registration fingers 301. The vacuum valve 263 then closes and the belts 252 stop to prevent an early second sheet feed. However, once the first sheet has been taken away the subsequent sheet is immediately acquired and forwarded to the wait station where it awaits the necesary signal from the machine logic to reactivate the vacuum belts to feed it into the nip of take-away rolls 68, 69 for transportation to the registration fingers 301. Thus, in the same way as with the feeder 46 the inter-sheet gap will be uniform and so may be reduced to a minimum without wide variations causing the gap to become too small to permit detection of the gap and the registration fingers to fall into the gap.
As shown in FIG. 28 the slide actuating mechanism 220 includes a cranked arm 226 which is rotated anti-clockwise to lift the nip splitter slide 221 when the front door of the copier is closed by means of a knob 227 engaged by the door of the copier when it is closed and which causes a push rod 228 to press against the crank arm 226. To accommodate tolerance variations the push rod 228 is in two parts interconnected by a compression spring 229. A latch 230 is provided on the knob 227 to enable paper feed when the door is open and a special inter-lock tool used by a service engineer is in position for checking the operation of the machine.
When the front door is opened the push rod mechanism 228 retracts and the nip splitter slide 221 moves downwardly under the influence of springs 231 so that the feeder mounting block 212 is lowered separating the friction retard roll 203 from the retard belt 202 and disengaging the feed roll 60 from the feed roll 61, the upward movement of the spring 213 (FIG. 11) being arrested by shoulders 214 on the block 12 as the latter is lowered. At the same time ramps 232 on the slider disengage the idler rolls 62 and 64 from the drive rolls 63 and 65 and an adjustable pin 233 on the upper end of the slider 221 presses down on the rear end of the support bracket 330 to disengage the registration rolls 302 from the drive rolls 303.
As the copy passes through the fuser 20 the soft heater roll 36 and the hard pressure roll 37 tend to bend the paper so that it becomes curled with the image side on the outside of the curve. It is important to remove this curl so far as possible from the sheet before it enters the buffer tray so as to avoid handling problems. To this end the sheets conveyed along the return path 55 pass through the sheet de-curler 350 which is arranged at the entrance of the horizontal guide 83. The de-curler 350 comprises of a pair of coating rolls 351, 352 and associated baffle means 253 so positioned relative to the sheet path that a sheet passing through the de-curler mechanism is bent around the lower roll 352 and has induced in it a degree of curl sufficient approximately to offset the opposite curl induced in the fuser.
As best shown in FIGS. 33 and 34 the de-curler mechanism 350 comprises a small radius hard roll 352 such as a metal (steel) shaft engaged by a relatively soft upper roll 351, for example having a compressible rubber surface which is spring loaded into engagement with the lower roll 352 forming a nip 354. The baffle 353 extends downwardly at the downstream side of the nip 354 and is arranged to deflect the sheet downwardly and control the degree of wrap around the lower roll which in turn controls the degree of de-curl. The position of the baffle 353 is adjustable in the feed direction of the sheet, i.e. horizontally as illustrated between for example positions shown in broken and full lines in FIG. 34, for adjusting the degree of paper wrap around the lower roll 352. A suitable adjustment mechanism, illustrated schematically at 355, is provided for this purpose.
At the exit from the de-curler 350 a post de-curler guide 363 returns the sheet to the horizontal and it will be noted that in order to limit the vertical separation of the sheet path at the opposite sides of the de-curler the input guides 364, 365 at the ends of the guide members 84, 85 direct a sheet upwardly into the de-curler mechanism. Sheets are driven by the de-curler rolls 351, 352 along a horizontal support surface 380 beneath a horizontal transport belt 381 entrained about rollers 382, 383 and a pinch roller 384 within the belt run presses the lower run of the belt against a roller 385 projecting through the support surface 380 to ensure driven engagement between the belt and the sheets.
At the downstream end of the belt 381 is arranged the offsetting mechanism 370. A pair of outrigger rolls 371 are provided on the downstream belt guide roll (383) shaft 386 and engage with a pair of skew rolls 372 which as best seen in FIG. 36 are arranged at an angle to the path of sheet travel. These rolls skew sheets passing therethrough as shown in FIG. 36 and thus have the effect of offsetting the sheets towards the rear of the copier. The degree of skew shown in FIG. 36 is somewhat exaggerated for illustrative purposes and a suitable degree of skew is about 40.
The operation of the copier illustrated in FIG. 1 will now be described. Sheets to be copied are placed in turn on the platen 23 and scanned by the optical system 22 to produce an image on the drum 11 which is then developed as described above. Copy sheets may be delivered to the photoreceptor from either the main tray 41 or the auxiliary tray 42 and during simplex copying these sheets are conveyed through the fuser directly into the output tray 6. During duplex copying sheet feed must be from the main tray with the auxiliary tray raised. The first page is placed on a platen 23 and scanned and the required number of copy sheets delivered from the main tray 41. These are conveyed along the sheet return path 55 to the buffer tray 43 where they are temporarily stored. The second page is now placed on the platen and scanned, the copy sheets to receive this image this time being fed from the duplex buffer tray 43 and the duplex copies so produced conveyed out of the copier into the output tray 6. The third page is copied onto blank sheets from the main tray and these are delivered to the buffer tray. Page 4 is copied onto the reverse sides of the page 3 copies and these are conveyed directly to the output tray. This process is continued until all the pages have been copied, it should be noted that if there are an odd number of pages the last page should be copied as a simplex document.
The sorter 3 comprises 15 or 20 bins B arranged in a vertical array. Sheets are fed to the bins B by a generally horizontal transport 411 which extends across the top of the sorter and a vertical transport 412 which extends downwardly past the entrances of the bins. Sheets are deflected into the bins by deflectors or gates G in the manner described in detail in our copending United Kingdom patent application no. 8041083 filed 22 Dec. 1980.
In the embodiment shown in FIG. 3 a recirculation document handler 4 is provided for feeding documents to be copied to the platen 23 of the photocopier. The document handler includes a storage tray 431 for the documents to be copied and document circulating means for delivering the documents in turn to the platen from the storage tray and for returning the documents to the tray, whereby the documents may be circulated and recirculated in sequence past the platen 23 for repeated copying (precollation mode). The documents may either be transported across the platen at a constant velocity past the optical system 22 of the photocopier which is held stationary in the solid line position shown, or instead they may be registered on the platen by registration gate 35 prior to copying and the stationary document exposed by scanning the optical system 22 across the document as described above. When the document is registerd on the platen, the document handler can be operated in so-called stacks mode wherein each document is copied a plural number of times during a single delivery to the platen.
Sheet separation and acquisition is accomplished by a vacuum belt corrugation feeder (VCF) 432 using flotation pressure differences between the bottom sheet and the sheets above, sheet corrugation and vacuum, a parabolic contour packet being cut out at the lead edge of the tray 431 and dished down in the manner shown and described in U.S. Pat. No. 4,275,877. Documents placed in the tray 431 bridge this gap and form a flotation pocket. Transport belt 436 surface through the document tray within the contour pocket. Document stack flotation is accomplished by a frontal assault of air from an air knife 437. The air jet impinges on the tray just in front of the lead edge of the document stack; this permits volumetric flow expansion of air within the pocket contour of the tray and also riffles the front edge of the documents to allow a differential pocket of air between the bottom sheet and sheet 2. This assists in the acquisition, separation and feeding of the bottom document.
For inverting documents during circulation to make duplex-to-duplex or duplex-to-simplex copies, a tri-roll inverter 440 is incorporated in the document handler in the post-platen transport 435. The post-platen transport 435 has a diverter 422. Documents may either be directed through the normal simplex path direct to nip rolls 443 or to the nip betweeen input (444) and common (445) rolls of the tri-roll inverter 440. The inverter 440 also includes a curved buckle chamber 446 dimensioned to accommodate and buckle 8" to 81/2" wide sheets. Because of the curved shape of the buckle chamber, the sheet trail edge is carried around the surface of foam rollers mounted on the common roll (445) shaft and into the nip between the common roll 445 and output roll 447. The sheet is then guided over the diverter 442 into the nip rolls 443. The common roll 445 is driven and the input and output rolls 444, 447 are idlers.
The finisher 5, which is described in more detail in our copending UK patent application no. 8226819 filed 21 Sept. 1982, includes an offsetting catch tray or output tray 460 and may be operated to perform the following functions:
The finisher 5 receives copy sheets from the processor at input nip 465 and conveys them to the offsetting catch tray 460 either directly along a path 461 or, via a compiler tray 462 in which they are registered and stapled, along a path 463. The direction of the sheets is determined by a diverter 464 located directly following the finisher input nip rolls 465a, 465b and which is operated in response to a signal from the procesor initiated by the operator.
The sets are carried into the offsetting catch tray 460, which is arranged beneath the compiler tray 462, around a large driven, rigid sun roll 476 with the aid of three driven, compliant planet rolls 477, 478, 479 and outer guides 480, 481. Thus as the sets are conveyed to the offsetting catch tray 460 they are inverted and their direction reversed. The catch tray 460 itself slopes downwardly in the same direction as the compiler tray 462 suitably at about 40 degrees.
In sets copying mode, a document set to be copied is placed face up in the document handler tray 431 with original document n at the bottom so that the pages of the document are copied in reverse order. Thus, copy sheets are delivered to the complier tray of the finisher in the order n-1. In simplex copying, sheets are received face-up at the output so that the assembled set is in page number order and are fed through the copier long edge first so that the top of the page is at the front side of the machine. Accordingly the top left-hand corner of the set is arranged in the registration corner and is stapled. Thus sets stapled in the compiler tray 462 are received face-down in the catch tray 460 with the stapled corner at the upper front of the tray.
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