DE1926512A1 - Sheet conveying device - Google Patents

Description

Patent attorneys Dipl. -Ing. F. Weickmann, ^ '

Dipl.-Ing. H. Weickmann, Dipl.-Phys. Dr. K. Fincke Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 27, DEN

MÖHLSTRASSE 22, CALL NUMBER 48 3921/22

Sch / Ga

XEROX CORPORATION
Rochester, NY-. i4bO3 / U. S. A.

Sheet feeding device

The invention relates to a device for the successive removal of sheets from the top of a stack of sheets. Such a device is for use in automatic and high speed operation working copy and reproduction machines.

It is well known that in recent years the steady Different industries grow a huge increase the need for paper, in particular due to the extensive Creates circulation of documents that satisfies had to become. In today's commercial automatic copy and reproduction machines, With which 5 to 60 copy sheets of 20 χ 28 cm in size can be produced per minute, the electrophotographic Image sheet is in the form of a drum, which is synchronized in time at a number of process stations is moved past. The usual sheet conveying devices are here in terms of

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the high transport speed of the copy sheets can only be used to a limited extent for their movement to the image transmission point.

To avoid the problems associated with the quick copy process Disadvantages in the latest machines are the flash exposure and a moving image plate used in the form of an endless belt. However, here too there was still no 'effective possibility for feeding the copy sheets at high speed with no feed interference or misalignment of the leading edges of the sheets to cause the image to be transferred.

The object of the invention is therefore to provide sheet conveying devices to improve so that a high transport speed of the sheets during their movement to the image transmission point is possible. In particular, a successive removal of sheets from the Upper side of a stack of sheets without skewing the sheets and with the correct orientation of their leading edge be possible with high operating speed.

To solve this problem, a device for the successive removal of sheets from the top is characterized a stack of sheets according to the invention by arranged on an axis parallel to the sheet leading edges, Separating rollers acting on the respective top sheet of the stack and moving it in its plane one rotatably attached at one end to the axle. Holding arm, the other end of which is attached to the attachment frame a plane perpendicular to the plane of the top sheet

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is pivotably mounted and a lifting of the separating rollers e! "iiiöglicht, and by one assigned to the holding arm VoITiclituiig to tilt the axis by one to its vertical axis coinciding with the longitudinal axis of the holding arm.

The invention is explained below for a better understanding of its further characteristics and advantages based on an in the embodiment illustrated in the figures. Show it:

FIG. 1: A perspective view of a device equipped with the device according to the invention electrophotographic reproduction machine;

Figure 2; the section of the reproduction machine to show the various process stations;

Figure 3ί a perspective view of the invention Sheet conveying device;

Figure hi shows a side view of the sheet conveying device according to the invention}

FIG. 5s shows the front view of the sheet conveying device according to the invention;

FIG. 6s a plan view of the sheet conveying device according to the invention in partially broken representation j

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FIG. 7: the section 7-7 from FIG. 6; FIG. 8: the section 8-ü from FIG. 5 »FIG. 9: the section 9-9 from FIG. 5;

Figure 10 is a partially broken section of the sheet registration rollers of the invention Contraption;

FIG. 11: the rear view of a double rotary electromagnet for sheet alignment and sheet feeding;

FIG. 12: the section 12-12 from FIG. 11;

FIG. 13: another operating position of the rotary electromagnet from FIG. 11;

FIG. 14: the section 14-14 from FIG. 10;

FIG. 15l shows a further part of the section i4-i4 Figure 10;

FIG. 16: the section 16-16 from FIG. 10 and FIG. 17: the section 17-17 from FIG. 10.

For a general explanation of the copier and reproduction machine equipped with the invention, the Figure 1 and 2, in which the various functional units this machine are shown schematically. As in all electrostatic or electrophotographic reproduction machines is a photo of an image to be reproduced on the sensitized surface of a

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projected electrophotographic imaging plate to form an electrostatic latent image thereon. This The image is then developed with an oppositely charged developer, so that an electrophoto- graphic powder image is created that corresponds to the latent image. The powder image is then electrostatically based transferred to an image carrier, on which it can be fixed with a fixing device by liinschmelzung, so that it adheres permanently to the image carrier.

In the illustrated machine, an original image D to be copied is placed on a transparent platen P. placed, which is fixedly arranged in an exposure arrangement 10 on the left side of the machine. While the image is on the plate, it is made with the exposure device exposed like a flash, which creates reflected light rays, their distribution of those corresponds to the information available on the original image. These rays of light are made with an optical Exposure system projected onto the photosensitive surface of an electrophotographic imaging plate, which is in the form of a flexible photoconductive Has tape which is guided on the transport device 11.

The transport device 11 is on a bracket The frame of the machine is slidably attached and drives the selenium band 12 in the direction of the arrow shown in FIG at a constant speed, during this tape movement, the light image becomes the original image projected onto the surface of the belt in a flash. The belt surface affected by the image rays contains a layer of a photoconductive material such as

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ζ. B. Selenium on a conductive surface. This layer is before exposure with a corona discharge device 13 sensitized »

The flash exposure of the strip surface with the light image causes the photoconductive layer to discharge in the exposed parts of the surface, which creates a latent electrostatic image on the belt Configuration of the projected light image of the original image is equivalent to. As the belt surface moves, the electrostatic latent image passes through a development zone B in which a development device 14 is arranged and the belt in a flat position is held. The developing device 14 includes a Vertical conveyor for conveying the developer material to the upper part of the transport device 11, where it is moved over the upwardly inclined selenium belt 12 for development of the electrostatic latent image is cascaded.

During the cascading of the developer via the electrophotographic imaging plate becomes the toner particles of the developer on the belt surface for generation deposited by powder images. As a result of this toner consumption, additional toner has to be added to the developer can be entered in such an amount that corresponds to the toner consumption. For this purpose there is an input device 15 provided, with which a precisely measured input of the toner into the developer material within of the developing device 14 is possible.

The developed electrostatic image is transported on the image belt to an image transfer point C, where a sheet of copy paper at one of the belt speeds

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The corresponding speed is brought up to the belt to enable transfer of the developed image. A sheet conveying mechanism is used for this purpose 10, the paper sheets from a paper peeling mechanism 18 feeds the developed images on the belt at position C.

After it has been detached from the belt 12, the respective image sheet is brought into a fixing device 21 in which the developed and transferred electrophotographic powder image is permanently fixed on the sheet. Then the finished copy is sent to a suitable for collecting the sheets Digit output from the machine.

To drive the selenium belt 12 in connection with the timed flash exposure of an original image to be copied, for carriage and cascading. of the developer, for detaching and conveying the paper sheets to the image transfer point C and through the fixing device A suitable drive device is provided in a time-controlled sequence.

The above description may help to understand the general The mode of operation of an electrostatic reproduction machine of the type under consideration here is sufficient.

The conveyor mechanism 18 for the successive removal of Scroll, from the top of a stack of sheets is in the Figures 3 to 9 shown. It is used to guide the Image sheets to the electrophotographic belt 12 so that the developed powder images from the belt surface to which image sheets can be transferred. To store a sheet supply in the form of a stack is a Storage compartment provided for separating a single one

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Image sheet from the top of the stack are used for separating rollers, and transport rollers are also used to guide a individual sheet provided in the transport system 16, • with which it is brought up to the belt 12. To coordinate the operation of the separating rollers and the transport rollers a device is provided which controls the sheet transport in such a way that the respective sheet in correct position and in accordance with the powder image is brought to the picture tape. Train control the increase in the sample multiple for the stack of sheets An evaluation device that monitors the height of the sheet stack serves for ongoing sheet consumption.

It can be seen from the figures that the device according to the invention for conveying sheets into the transport system 16, in time with the appearance of a developed image on the image tape 12, comprises a storage compartment which is slidable from one side of the production machine between the frame plates kOI and 402 is. It contains a stack S, which can be formed, for example, from paper sheets of different widths.

The storage compartment Λ00 has a two-part stacking pad. These parts are a stationary base plate kOJ and a movable base plate kok _f which both lie in a common plane and are provided with flat and relatively wide, finger-like strips 405 (FIG. 6) which interlock when a stack of sheets is stored on both plates. The fingers k05 carry the stack when the movable base plate kok is pulled backwards into the position shown in broken lines in FIG. The base plate can be pulled into this position if the

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Storage compartment is filled with long sheets, for the processing of which the machine takes longer operating stages must perform.

The stationary plate 4O3 has a box-like Structure 407 attached, one edge 40U on one Intermediate plate 409 is welded by spot welding connected to the bottom surface of the plate 403 is. The sides of the intermediate plate 409 that are parallel to the plates 403 and 404 below these are as downwardly protruding, beveled side surfaces 4O4 formed, which are held against forward and backward movement with a sliding mechanism to be described later will. The intermediate plate 409 is provided with a slot 412 in the middle between the side surfaces 411, which runs almost over its entire length. Two screws 413 protrude through this slot are attached to the bottom surface of the middle finger 405 of the movable base 404. These screws serve to fasten a metal band 4i4 under the plate 4o4, which has a downward bend 415 is provided on the actuator 416 of a switch SW acts when the movable plate 404 is retracted. The switch SW causes a switchover when longer sheets are entered into the storage compartment and the base plate 404 is withdrawn the operating step length of the machine. The plate 404 is not only used to adapt to the longer sheet format, but also to switch machine operation.

Each of the side surfaces 411 can be adjusted in the vertical direction, so that the storage compartment during the pa-

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can be called or lowered. For this purpose, the frame plate 401 is provided with a vertical Guide rail 420 provided, the open side pointing into the interior of the device. Similarly, the frame plate 402 shows a guide rail 421 which the guide rail 420 faces. The guide rail 420 contains two guide rollers 422 that are spaced apart are fastened to one another on a vertical plate 423, which is mounted on one of the side surfaces 411 is. The guide rail 421 is used similarly for vertical guidance two rollers 424 which are mounted on the plate 425. This plate is on the other side 411 mounted. With this arrangement, the storage compartment Moved freely in the vertical direction, with its horizontal movement through the fixed guide rails 420 and 421 on the side surfaces 411 prevented is.

To control and automatic movement of the To effect storage compartment in the vertical direction, the front edges of the plates 423 and 425 with a rack 426 and 427 provided. To drive each rack there are three vertically arranged one above the other Gears that move the storage compartment in a vertical direction. As can be seen from Figure 7, the rack engages 427 into an upper gearwheel 42ü, which is mounted on an axle piece 430 which is attached to the frame plate 4O2 is attached. An intermediate gear 432 is fastened below the gear 428 on an axle piece 431. Under This intermediate gear 432 is a lower gear 433 mounted on a drive axle 434, one end of which rests in a bearing of the frame plate 402, while the the other end is rotatably mounted on the frame plate 401.

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This gear group is used to drive the rack 427 and is arranged on one side of the conveying device. On the other side of the conveying device, a second group of gears 435 '43 "and 437 is provided, which are arranged on the axle pieces 4-38 and 439 or the drive axle 1''} U. The axes 430 and k3ü and the axes 431 and 439 are aligned with one another. When the lowermost gears 433 and 437 rotate, the respective upper gears are rotated, whereby a corresponding movement of the racks 426 and 427 takes place.

The outer end is used to rotate the lowest gears of the drive axle 434 on the side of the frame plate 401 provided with a drive gear 440 that in a Worm drive. 441 engages on the axle 442. This axis is mounted between the flanges of a bearing element 443, which also has a motor M2 whose axis is coupled to the axis 442. The motor M2 preferably works at a low speed, so that when coupled with the worm drive 441 and the drive gear 440 a relative slow movement of the lag-multiple takes place.

The centering of the stack S on the optical center line of the copier or duplicating machine correct alignment and removal of the sheets from the top of the stack is done with two verticals arranged guide parts 445 and 44υ, which in their operating position rest against the front corners of the stack. The guide part 445 is with a horizontal guide pin 447 in its vertical Position held that is attached to the frame plate 401 is and by a hub element 44ö on the guide part 445

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protrudes. Similarly, the guide member 446 is held in its vertical position with the guide pin 450, which is attached to the Frame plate 402 is attached and sits in a hub element 451 of the guide part. The guide parts 445 and 44b are likewise provided with hub elements 432 and 453 at their lower ends, which are used to hold them serve and enable their movement relative to each other.

As can be seen from FIG. 9, the guide part is 445 provided with a leading edge 454 running the length of the guide part runs and on the front edge of the Acts paper stack at one of its corners. The side faces of the stack S act along the same corner a guide surface 455, which also has the entire length of the guide part 445 runs. The guide member 446 is similar and has a Guide edge 456 and a lateral guide surface 457 to act on the front and side surfaces of the paper stack at the corner assigned to them. The side faces 455 and 457 can be moved relative to each other as well as to the center line of the storage compartment 400 in order to the stack S relative to the optical axis of the electrophotographic Center machine. This process is important for image transmission.

To move the side surfaces 455 and 457 relative to one another the conveyor device 18 is provided with a manually operated drive system that consists of there are two joints 460 and 461, each with one end to the hub elements 452 and 453ι with the other end are connected to a block 462 which is rotatable on an axis 463. The connection points of the joints 460 and 461 with the block 462 are offset from the axis of rotation of the block by one Movement of hub members 452 and 453 "when rotated

of block 4o2 in both directions. the Rotation of the axis 463 is done with a knob 464, the is attached to the outer end of the axle on the back of the conveyor 1β. A lock button 465 is attached to the extreme end of the axle 463 and is used to move the button 464 in the axial direction its axis against a non-rotatable block 466 which is fixed on a spacer plate 469 and on a Edge 467 of the axis is held. A twist of the Knob 465 locks knob 4-64 from rotation to prevent inadvertent movement of the guide bases and 446 to prevent. When knob 464 is rotated, block 462 is used to drive joints 460 and 461 in FIG rotated in both directions, whereby a corresponding movement of the hub elements 452 and 453 takes place. While the paper input becomes the adjustment knob 464 the guide parts 445 and 446 to the respective paper width of the storage compartment 400 and for easy input further sheets of paper rotated. After the storage compartment is filled with leaves, the knob 464 is rotated so that that the guide parts are moved towards each other at the same time, whereby the stack relative to the optical Axis of the electrophotographic machine as well as the correct position of the paper sheets in relation to the The conveying process is centered.

The driving effect caused by the button 464 and the axle 463 to move the parts 445 apart and 446 takes place against a spring 469 which thereby is held under tension that its ends are attached to each guide member and that both parts are thereby usually squeezed. Preferably

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the spring has such a strength that when it is unlocked Button 4-64- the guiding part assigned against the ilines Edges of the stack of sheets are pressed, so that a good alignment between guide parts and Sheet stack is guaranteed.

The guide surfaces 455 and 457 act on a driver element 47O attached to the outer ends of two rods' 1-71 and 472 which are axially aligned with one another aligned and slidable in blocks 473 and 474 are stored. The blocks are spaced apart under the stationary plate 403. You wear the corners of the stack of sheets. A rod 475 is in the opposite one another Ends of rods 471 and 472 are displaceable stored and provided with a spring 476a that him surrounds and the rods 471 and 472 outwardly apart presses. As a result, the driver elements 470 are grounded against the guide parts 4-4-5 and 446 are printed. The take away items 470 lie under the stacking corners and carry Stack of block sizes of all widths.

The upper ends of the leading edges 454 and 456 are made held slightly under the top sheet of stack S. The individual sheets of paper are being conveyed away passed over these upper ends. There is a device for separating only the top sheet from the stack provided at opposite corners of the pile that have a slight healing power on the front Corners and the leading edge of the top sheet. Each of these separators consists of a vertical movable piston 476 and 477 »which is in one

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tilcalen channel 47o in each front part of the guide parts 445 and 446 is freely movable. Each piston is provided with a damper 480 and 4o1 at its upper end, who can move with him.

The weight of each piston 47t »and 477 acts on the front corners of the stack of paper, normally this force causes the pistons to follow each corner accordingly paper consumption down. The piston weights also form an inhibiting force that only prevents delivery a single sheet supported when the separation rollers act on the stack in a manner to be described. The movement of the pistons 477 and 47 <J downwards is preferably carried out within small limits around the Also limit downward movement of the corresponding damper, Limiting the lowering of the damper occurs when the stack is lowered before a new paper input, so that it is ensured that the Dampers rest on the corners of a freshly entered stack without any special handling. When lifting the Stacked and correctly centered with the guide parts 445 and 446, the stack corners reach the damper and lead them up until the top sheet of the stack is in its position suitable for removal is. .

For conveying one sheet at a time from the stack S in shortly before the narrow slot between two guide plates 482 and 483 arranged close together the top sheets of the stack S is a separating device, the first pair of intermittently driven Includes rollers 485 which are rotatably mounted near the side edges of the stack. Furthermore is a second pair of driven rollers 4ö6 provided,

the "are mounted between the Hollen 485 interface. All the rollers act on the top of the paper stacks. Each outer Hollenbach 4b5 mounted on a driven axle with a unidirectional clutch k'öii, the free rotation of each roller in the direction HLI ^l j allows the top sheet to move when it is separated from the stack, at a greater speed than the roller can move the sheet.

The inner rollers 4b6 are fastened on a drive sleeve which is coupled to each roller via a unidirectional coupling 491, which is designed similar to the coupling k'a'6. The axes 4b7 are each fastened in an unde of the drive sleeve 490, which also contains a spiral spring 492 in its interior, which presses the two axes k'd> 7 outwards so that the outer rollers 4üi> relative to the stacking edges in a predetermined position be fixed. This outward movement is limited by stop elements 4 <? 3 of the axes, which stop against the guide surfaces 455 and 457. When the guide members 445 and 446 are moved apart, the axes 487 follow accordingly, in order to ensure that the rollers 4ü5 maintain their predetermined position relative to the stack edges regardless of their width.

Each axis 487 is rotated with a 4 ^ 4 pin, the between each axle end and the drive sleeve 490 The sleeve 490 is provided at each end with provided with a slot in which each pin can be inserted binding with the respective axis is used and

^BATH

which the axial movement of each outer roller 4c> 5 opposite the sleeve limited.

The drive sleeve 490 is rotated with a gear 495, which is attached in the middle of the sleeve between the flanges of a holding arm 496, the sleeve 490 and thus carries rollers 485 and 4b6. This holding arm 496 consists from a front part 497i the end of which is the sleeve 490 carries, as well as a holding part 49ü, which in its shape corresponds to the front part 497. These parts are attached to one another at their ends in such a way that one in part 4-98 provided slot 500 a projection 50 1 of the front part 497 contains. Both parts 497 and 49B can be apart be taken. This connection also allows limited rotation of the front part 497 about his Longitudinal axis, so that all four separating rollers remove the sheet surface of the top sheet regardless of a stack deformation touch by moisture. The purpose of this limited tilting movement is described below.

The parts 497 and 498 of the support arm are with an adjustment screw 502 connected to each other, which is provided within the channel formed in the arm 496 and with one end in an internal thread 503 of the holding part 498, with its other end in a hub part 5O4 of the front part 497 is mounted. A retaining ring is provided on the hub portion 504, the rotational movement of the Screw 502 allows, but an axial movement relative to screw 502 prevented. Removal of the front part 497 is possible by simply turning takes place until either the thread 503 or the Hub member 504 is free. The screw 502 serves as a Adjusting screw between parts 497 and 498 to Adjustment of the tension of a drive belt for rollers 485 and 486.

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The holding arm h96 is mounted between the frame plates 401 and 402 on a sleeve 505, one end of which is fastened with a knurled screw 506 which can be adjusted by rotation on a holding sleeve 507 which is fastened to the frame plate 40 1. Normally, arm 496 rests by gravity with rollers 485 and 4-6 on the top sheet of the paper stack. However, an additional force must be generated in order to increase the pressure of the rollers on the stack. This is done with a torsion spring 50o, one end of the RandeIschraube 506 and their arrival _v

"whose end is attached to an Ilaltescheibe 509, through which the sleeve 505 protrudes and to which it is attached is. The spring 508 can share in their strength between their two holding so that the bearing sleeve 505 as well as by gravity is rotated by spring force and thus ensures a more reliable removal of even heavier copy sheets. The retaining plate 509 is used when the stack is removed also to limit the downward rotational movement of the support arm 496 and to prevent undesirable Force effects on the individual structural parts. The holding plate 509 is also used for actuation a switch S ¥ 3 for upward movement and one

Switch S ¥ 4 for downward movement in a manner to be described.

Inside the bearing sleeve 505 is over almost the entire Distance between the frame plates 401 and 402, a drive sleeve 510 is provided, which with its one End is stored in a bearing 511. The outer ring of this bearing is on the inner recess of the holding sleeve 507 attached. The other end of the drive sleeve is stored in a coupling mechanism 512, the

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is attached to the frame plate 402. Within the Drive sleeve 510 is a drive shaft 513 rotatable arranged with a linden tree in a warehouse 514 is mounted within the Hai teliülse 517 and with its other end protrudes through the frame plate 402 and a drive roller 515 for coupling with a drive system, the clutch is used to connect the drive axle when switched on 513 with the drive sleeve 5IO1 so that a gear 510 rotated between the side parts of the holding arm 496 will. This drives a toothed belt 517, which is also guided over a second toothed wheel 495 and causes its rotation. During the engaged «- th state of the clutch 512 is the gear 516 and thus the gearwheel 495 rotated, so that with it the inner drum rollers 486 and the outer separating rollers 4t> 5 are driven.

During the operation of the conveyor device, this is in each case top sheet moved by frictional action with rollers 485 and 406, with the front corners facing up the dampers he 4oO and 4ö1 act, which are designed in this way are that they are a continuation of the vertical leading leading edges 454 and 456. In this way they form a vertical barrier to the passage of leaves which, however, affect the outer ones Ends of the leading edge of the forward moving top sheet is restricted. While the roles and 486 a force iji forward ad. ent on the top Exercise sheet, the thus inhibited front corners of the sheet create a delay the forward movement of the otherwise continuously advanced sheet, this delay creates

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a slight sliding movement of the corners inwards, so that 'the sheet hunched up accordingly. This ensures its separation from the underlying sheets of the sheet stack. During the conveyance of the top sheet into the gap between the guide plates 4tt2 and kü'J both. Separation roller pairs 405 and ktib driven «As the sheet advances, its leading edge moves into the gap between the closely spaced alignment rollers 520 and 521, which act on the sheet and move it further to release the stack S. This second movement of the sheet takes place somewhat faster than the initial sliding movement with the separation rollers 485 and 486 and thereby causes a corresponding individual and free rotation of the separation rollers, which is made possible by their one-way clutches. At this point in time when the registration rollers 520 and 521 'act on the conveyance of the sheet, the clutch 512 is switched off, whereby the drive via the drive sleeve 490 ceases. If the top sheet is slightly tilted during its advance over the remaining part of the paper stack, this tilting is prevented from continuing in that the separating rollers 485 and 486 are stopped individually and one after the other when the trailing edge is pulled under them. Without the individual one-way clutches, the next sheet of the stack is also tilted if each separating roller slides off the rear edge of the previously pushed off and tilted sheet. Since the rollers are arranged on a common axis, some that are still on the previous sheet will continue to rotate. This also rotated those roles that had already released the sheet

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have so that the corresponding part of the next sheet is pushed forward and also tilted would.

The downward movement of the storage compartment 400 is limited by a limit switch SW7 which is attached to the frame plate 401 and is electrically connected to the Ilebe motor M2 via a control circuit which switches off the motor M2 when the switch is actuated when the storage compartment reaches a predetermined lower position 'The switch is actuated with a projection 522 which is attached to the plate 425 and' actuates the switch SW7 at the correct position. 1, in a further switch SiVo is attached to the frame plate 40 1 and controls the upper limit position of the storage compartment 4üO by the action of a Vorprtm ^ es Ij - '3' which is attached to the plate 42J. jjrreichb the La ;; eri'ach 400 a certain upper La, -, «, the switch SW <> iiiiie r-ha Lb of an ijtuuer-H circuit is actuated and causes the lifting motora UZ.

Di-.2 alignment rollers: j2ü and; j2 1 of the sheet alignment mechanism shown in Figures and J4 to Γ / interact with two alignment fingers, which are arranged in the transport path of the sheets and bring the leading edge of each sheet into a predetermined position before the Sheet is passed to the Transportraechanismusiö, which moves it to a developed electrostatic image on the image belt 12. As shown in FIG. 10, the upper alignment roller 520 consists of a metallic core 525 which is provided with a number of soft rubber layers 526 which act by friction on the respective paper sheet. The roller 520 is with one hand on an axle;> 27 (figure \ j)

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which is contained in a bearing housing 528 and is attached to the axle with a bracket 530. The other linden of the roll is on an axle piece 531 stored, which is provided in a bearing housing 532, which is fastened with a clamp 533.

At the left end of the alignment roller 520 as shown in FIG 10 is a gear 53 ^ on the axle piece 531 attached. The bearing housings 52ö and 532 are eccentric to adjust a setting to a pressure value between

fc see the upper roller and the lower roller 521 allow. The end of the alignment roller blind 520 is also held with levers 535 and 53t> (Figures h and 5), the ends of which are pivotally mounted on fixed pins 537, because the holes are attached to the frame platforms 401 and -1-O2 in an axially aligned manner. The pin 537 is at the plat Le 402 be tust igt and forner to be provided with a gear ■ yjo , which is driven by the gear 53 ^ · via a chain 'j ho . In this way the requirement of the alignment gyroiies, which is still described as i-ju, is realized. An idle gear wheel jh \ is also provided on the lever 536 and acts on the chain jhO to tension it. Furthermore, it also enables the chain to be removed from the tooth ■

ψ wheels.

The upper edge of the frame plate kQ'i is provided with a vertical slot 5 ^ 2, into which the axle piece 527 egg upper roller 520 is inserted when the roller is in the operating position. The Achsstiick 531 at the other end of the roll is used in a similar way into a slot 5 ^ 3, which is formed at the upper edge of the frame Platt · 402nd These slots allow the roller 520 to pivot away from the lower roller 521

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out of the transport path of the sheets, so that maintenance the device as well as the elimination of transport malfunctions is possible.

Immediately below the upper alignment roller 520, parallel to this, the lower alignment roller 521 is provided, which consists of a number of freely rotatable short rollers 544, which are mounted overall with ball bearings on a common sleeve 545, which is on a shaft 546 with a roller bearing 547 on each The end is rotatably mounted. One end of the axle 546 is mounted on the frame plate 401 and the other end is arranged in a bearing that is fastened in an electromagnet mount 549. The axis 546 ends here in a straight slot 550 into which a tongue 551 protrudes, which is provided on a movable actuating element 553 of a double rotary electromagnet 554, which is described in more detail below an electromagnet SOL-2 for downward movement and transmits a non-axially directed rotary movement to the drive shaft 546 in both directions over an angular range of approx. 45 when one of the magnetic coils is switched on.

On the sleeve 545 is between two rollers 544 an alignment finger 555 is provided with an adjustment screw is attached to the sleeve 545 and with her is moved or is at rest.

As shown in Figure 16, the periphery of roller 520 is a small distance from the periphery of rollers 544. This distance is greater than the thickness of a sheet of paper and allows the sheet of paper to enter the gap between the rollers against fingers 555 and to be retained this location until a conveyor cycle begins. to

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At this point in time, the paper sheet is still advanced with the separating rollers 485 and 406. This movement is terminated by the fingers 555 in the transport path of the sheet, so that the sheet bumps up and momentarily aligns its leading edge. While the leading edge rests against the fingers 555, the top roller 520 is continuously rotated, but is a short distance from the surface of the sheet and therefore cannot move it over the fingers 555. In order to enable proper alignment of the leading edge of the paper sheet on the fingers 555 and thereafter a forward _ ψ movement of the sheet with the rollers 520 and 521, the alignment mechanism is provided with a controller controlling the movement of the upper roller 520 down onto the Paper sheet controls to advance it simultaneously with a retraction of fingers 555.

This control mechanism contains a first joint part (FIG. 17) which surrounds both axes 531 and 546 of the rollers 520 and 521 on the frame plate 502. Furthermore, a second joint part 557 (FIG. 15) is provided which surrounds both axes on the frame plate 401. These joint parts keep both rollers more or less close one above the other, k The movement of the upper alignment roller 520 to the lower roller by a small amount occurs through the activation of the solenoid SOL-2. This rotates the actuating element 553 by an angle of 45 , whereby the drive shaft 546 is rotated accordingly. As shown in Figure 17, a crank element 55 & is attached to the axle 546 of the lower roller 521 and is provided with a cam pin 559 which is movable in an arcuate cam opening 560 in the lower part of the hinge part 556, Da-. through the axis 531 is moved towards the axis 546. As already stated, levers 535 and 536 allow

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a limited movement of the upper roller 520 to the lower roller 521. Becomes the crank element shown in FIG Turned 55ö clockwise, the cam pin pushes

559 by moving it to the center of the cam opening

560 the joint part 556 down slightly, whereby the Roller 520 is accordingly taken along in the direction of roller 521.

In order to maintain the fixed position of the axis 5 ^ 6 of the lower roller, is the joint part 556 with a vertical slot

561, through which the axis 5 ^ 6 is guided. This results in a fastening of the axis 5k6 in the joint part 556 with a margin that is effective during the slight movement of this joint part. During the movement of the cam pin 559 from the center of the cam opening 560 to its left end, an angular range of 45 is traversed, which is caused by the further rotation with the electromagnet SOL-2. The distance between axes 531 and 5k6 remains constant. This movement of the cam pin 559 can be regarded as dead time for the operation of the movement mechanism for the action of the rollers 520 and 521 on one another, in which another function is fulfilled with the remainder of the movement of the axis 5 ^ -6, namely the rotation of the alignment fingers 555 from the area of the leading edge of the sheet of paper that is attached to it.

The mechanism provided for controlling the movement of the fingers 555 is shown in two operating steps in FIGS. Ik and 15 and is actuated with the joint part 557. The joint part 557 is identical to the joint part 556 and is provided with a vertical slot 562 through which the axis 5 ^ 6 is guided and in which it is a

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4 8/0 8 8 1

Has leeway when the joint part 557 is moved. A cam pin 5 <-> 4 is guided through a cam opening 563. The curvature and the angular position as well as the distance between the cam opening 563 and the axis 546 correspond to the corresponding dimensions at the cam opening 560. During the clockwise rotation of the axis 5k6 (FIG. 14), the same setting of the cam pin 564 takes place as has already been described for the pin 559.

^ A toothed sector 565, to which the cam pin 564 is connected, is attached to the axis 546 in the area of the joint part 557. A second tooth sector 566, which is mounted on a pivot pin 567 in the frame plate 401, engages in this tooth sector 564. The pivot pin 567 also carries a cam part 566, which is attached to the toothed sector 566 and can be adjusted in its angular position relative to this with an adjusting screw 569 (FIG. 15) Cam opening 563 is moved and the hinge part 557 is moved downwards. This movement occurs simultaneously with the downward movement of the joint part 556, so that a smooth and uniform movement of the roller 52O downward is ensured.

As shown in Figure 15, the cam member is 56ii provided with an angled cam opening 570, the The center of curvature coincides approximately with the axis of the pivot pin 567. The second part 571 of the cam opening runs in the radial direction to the pivot pin axis. This angular cam opening is used to Control of a rotatable actuating element 572 which is rotatably mounted on the axis 546 near the tooth sector 5 ^ 5 and attached to one end of the sleeve 545.

909848/0881 bad original

This is done with a control pin 573 , one end of which is attached to the actuating element 572 and is arranged in the cam opening parts 570 and 571. When the hinge part 5b8 is rotated from the position shown in FIG. 15 in which the pin 573 is in the curved cam opening part 570, no rotation is exerted on the actuating element 572, ie the alignment fingers 555 are not rotated. This is because the control pin 573 only slides in an arcuate cam opening when the cam member 568 rotates about its axis. This initial rotation of the cam part 5t>fc> is caused when the solenoid SOL-2 is switched on for the first time, which also causes a brief movement of the control pin 559 for the first part in the cam opening 560 in the manner described. The upper alignment roller 520 is only held on the lower roller 521 while the alignment fingers are still in their alignment position.

If the pin 573 reaches the end of the cam opening 570 at the tip of the opening angle, another actuates Rotation of the joint part the pin 573 in such a way that a rotation of the actuating element 572 in FIG clockwise, causing a slight rotation of the sleeve 5 ^ 5 along its axis «Since the Fingers 555 attached to the sleeve 5 ^ 5 are caused this latter movement of the joint part 557 a movement of the fingers out of the area of the leading edge of the respective sheet between rollers 520 and 521. This rotation of the fingers takes place in the illustration clockwise according to FIG. The adjusting screw 569 is used to align the cam part 5öö relative to the tooth sector 5 ^ 6, in order to achieve a correct rotation of the beta

909848/08 81

tigungseleaentes to reach 572 at a time when rollers 520 and 521 interact · The top roller

520 presses then the short rollers ^> hk of the lower Auerlchtungerolle and causes so that the Jtweilige paper sheet between the rollers at the same time "of the movement it thee finger 555 moves its rotation. The fingers 555 turn downwards from the area of the leading edge of the sheet.

As can be seen from the foregoing description, the sheet conveying mechanism 18 is an ongoing conveyance of individual sheets of paper to the sheet aligner which consists of the rollers 520 and 521 and the fingers 555 in the "movement range of the leaves" you aligns each sheet that is drawn into its prescribed position and then gives it in a temporal context old with the movement of the electrophotographic belt 12 to the image transfer station so that it can be compared with an electrophotographic Powder image applies to ama.

As already described, the double rotary electromagnet 55 * t consists of two flat coil magnets SOL-1 and SOL-2 and causes the axis 546 to rotate in both directions without the otherwise occurring movement in the axial direction. For this purpose, the solenoid SOL-1 for upward movement has an armature 57 ^ in the form of a flat disc, which is rotated in one direction when the electromagnet is switched on. The solenoid SOL-2 for the downward direction has an armature 575 in the form of a flat disk, which is rotated in the opposite direction when this electromagnet is switched on.

The disk eagles are in planes parallel to each other

909848/0881 ^{BATHROOM 0RIGINAL}

arranged on a common axis of rotation. Everyone Magnet has a central opening through which a rotating element 57 °, which is attached to the anchors and movable with them as a unit. The rotating element 57 ° contains an inserted actuating element 533 and is provided with internal teeth that fit into the Splined outer surface of the actuator engages. With the actuator is a tongue 351 and a recess 550 is provided as a drive connection to the axis 37 ° of the lower alignment roller 5 ^ 1. When moving one of the anchors 57 '+ and 575 by the one assigned to it Solenoid, the element is moved in the axial direction along the actuating element, whereby the other Anchor is also moved with.

When one of the solenoid coils is switched on, the respective armature is rotated. This rotary movement takes place through the joint action of a number of balls 577) which are held between two inclined depressions 57 ^, one of which is on the outer surface of each armature, the other is provided in a cover plate 579, which surrounds the electromagnet as a housing. The depressions 57'J are arranged in such a way that their longitudinal axes and thus the inclined surfaces are circular, the center of curvature coinciding with the axis of the armature. Each cover plate 579 and the armature assigned to it are held parallel to one another and thus hold the balls within the inclined depressions.

If the electromagnet SOL-2 is switched on while the electromagnet SOL-I is switched off, the armature 575 is attracted to the coil of the magnet SOL-2. This causes the element 576 to slide to the right (Figure 10)

309840/088, BAD

without causing an axial movement of the actuating element 553. This movement causes a movement of the other armature 57 ^ to the cover plate 579f assigned to it, ie from the position shown in FIG. 12 into the position shown in FIG. The normal magnetic action of the coil of the solenoid SOL-2 tends to push the armature to the right in the illustration shown in FIG. Since the balls 577 directly prevent axial movement, they are moved along the inclined depressions 57 <3 of the cover plate 579. The armature is rotated by the locking effect of the front edges of the inclined "indentations of the armature 57 '* - against the balls. This rotation takes place by an amount that is determined by the length of the indentations 57 <-> and the range of motion of the armature in the axial direction To actuate the upper alignment line 520 in the paper transport position and to move the fingers 555 to the center, a threat of a wave from approx.

The solenoid SOL-I is used for the upward direction. switched on, the armature 575 is rotated in the opposite way ^{to the armature 57 2 I-.} Regardless of which electromagnet is switched on, both armatures move 57 ° as one unit with the element fastened between them and slide relative to the actuating element 553. However, the direction of rotation of the actuating element depends on which electromagnet is engaged. When the "leaf solenoid SOL-I for upward direction" is switched on, the roller 520 will hold in its uppermost position " while the fingers 555 " assume a raised position in the leaf transport.

Above was an embodiment of the inventive

BATH ORIGINAL 9 0 9 8 4 0/0881

Device for the successive removal of sheets inscribed from the top of a pile of sheets «Xm However, within the scope of the following claims, numerous other embodiments are possible which, as a whole, result from the basic idea of the invention are applied «

909848/0881

Claims (6)

PATENT CLAIMS Device for the successive removal of sheets from the top of a sheet stack, characterized by separating rollers (485,4ΰό) arranged on an axis (4ο7, Λ9θ) parallel to the sheet leading edges, acting on the top sheet of the stack (s) and moving it in its plane ), by a at one end to the axle (4ö7 "49o) rotatably loading W strengthened support arm (496) whose other on linden Device frame (401, 402) mounted pivotably in a plane perpendicular to the plane of the top sheet and which enables the separating rollers (4ü5,4d6) to be raised and is associated with a holding arm (496) Device (500,501) for tilting the axis (4j7,49 $ about a perpendicular to it and with the longitudinal axis des Hai te poor s (496) coincident axis. 2. Apparatus according to claim 1, characterized in that the holding arm (496) consists of two interconnected Divide (497,498) consists. 3. Apparatus according to claim 2, characterized in that one part (497) of the holding arm (496) with his the end facing away from the other part (49ü) the axis (487, 490) rotatably carries that the other part (49b) of the holding arm with its facing away from the first part (497) End connected to the device frame (4θ1,4θ2) and that the device for the tilting movement consists of connecting elements (500,501) of the two parts (497, 49b) of the holding arm (496). 4. Device according to one of claims 1 to 3 »thereby 90 9 848/0 081 characterized in that each separation roller (485, 486) with a unidirectional coupling (48LJ ") is provided with which it is on the axis (487,490) is held and the one rotation of the respective roller (4851486) with a drive * action by a other role (485,486) prevented. 5. Device according to one of claims 1 to 4, characterized characterized that for the separating rollers (485, 486) a drive device (513 »517) is provided is composed of a drive axis (513) arranged parallel to the roller axis (487, 490) and one of the two There is a drive belt (517) connecting the axes. 6. Device according to one of claims 1 to 5 »thereby characterized in that two separating rollers (486) are arranged on an axle main part (490) while the other separating rollers (495) on the outside of the first-mentioned separating rollers (48b) with the Axis main part (490) coaxial and opposite this rotatable axle outer parts (487) are arranged. 909848/0881 -3Ί- Blank page