EP1161394A1 - Verfahren und vorrichtung zur ausrichtung von einzelblättern in einem blattverarbeitungsgerät - Google Patents
Verfahren und vorrichtung zur ausrichtung von einzelblättern in einem blattverarbeitungsgerätInfo
- Publication number
- EP1161394A1 EP1161394A1 EP00920509A EP00920509A EP1161394A1 EP 1161394 A1 EP1161394 A1 EP 1161394A1 EP 00920509 A EP00920509 A EP 00920509A EP 00920509 A EP00920509 A EP 00920509A EP 1161394 A1 EP1161394 A1 EP 1161394A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- recording medium
- transport
- alignment
- transport direction
- stop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/16—Inclined tape, roller, or like article-forwarding side registers
- B65H9/166—Roller
Definitions
- the invention relates to a method and a device for aligning single sheets in a sheet processing device.
- the record carrier If the record carrier is outside the target transport path specified in the device, it cannot be processed without errors. In a printing device, for example, this leads to an oblique print image on the recording medium.
- An alignment device for a single sheet printing device or a copying machine is known for example from O-98/18053 AI. knows.
- a sensor is provided which detects the lateral edge of the recording medium, determines its position relative to a desired pressure position and shifts a transport device transversely to the transport direction of the sheet depending on the deviation of the actual position from the desired position of the sheet.
- this device permits highly precise positioning of the recording medium, it is relatively complex because of its sensor device and the movable transport device.
- a somewhat simpler alignment device is known from DE 27 50 252 AI.
- a sheet-shaped original is required for alignment with a stop.
- the original is driven by a roller arrangement on which balls rest, the original being passed between the rollers and the ball.
- the invention is based on the knowledge that a particularly gentle alignment, which is also suitable for sensitive recording media, is possible in sheet feed devices, in that the part of the recording edge on the stop side at the back in the transport direction first moves to a stop, i.e. is applied to a reference edge, and in the further course the remaining parts of the edge of the recording medium to be aligned are guided to the stop.
- This can be done in an alignment section in particular by rotating the recording medium with the rear part of its stop-side edge toward the reference edge (stop). It is only in the further course of the alignment process that the recording medium is then placed completely against the reference edge, thus achieving a material-friendly alignment of the recording medium even with lightweight recording media.
- the edge of the recording medium located at the front on the aligning stop in the transport direction is protected.
- the transport device in the alignment section e.g. by means of a driven roller on which a ball rests and by arranging the transport device near the stop, it is avoided that less rigid recording media form folds or bumps on the stop.
- the sheet-shaped recording material is aligned on the stop, in particular at a constant transport speed, without additional acceleration devices.
- the stop forms a reference edge, which in particular corresponds to the longitudinal edge of a target transport path.
- the alignment therefore takes place continuously over the entire alignment route.
- the recording medium can be decelerated or accelerated at the beginning or at the end of the alignment section. In this way, in particular relatively short sheet spacings in the sheet stream of successive record carriers can be achieved.
- the device according to the invention comprises in particular at least one drive roller, the drive axis of which is at an acute angle to the transport direction.
- This drive roller can interact with a ball, which presses the recording medium passing by against the drive roller and thus generates the friction required for transport.
- the size, material, surface structure and weight of the ball can be easily adapted to the respective requirements.
- the ball can only generate the friction through its own weight. It can be freely stored in a ball cage.
- the ball can be provided with a pressure spring acting in the direction of the recording medium to support the frictional force acting on the recording medium, in particular when relatively heavy recording media are to be processed.
- the provision of ball / roller pairs in the alignment and transport device according to the invention achieves particularly gentle processing of the recording media, as a result of which very light sheets of 60 g / m 2 or less can be aligned gently and safely.
- the structure according to the invention also provides a simple, inexpensive and space-saving device which is only slightly susceptible to faults and has a wide range of usable formats, materials, types and weights for the sheet-shaped recording media, without having to make settings (parameter changes) for processing the various recording media the alignment section or on the transport or alignment device.
- the ball of a roller / pair of balls is in particular held in a free-running manner in a ball cage and, by means of its gravity, is centered on the transport roller which is inclined to the transport direction.
- the arrangement consists of several pairs of rollers / balls, in particular three such pairs.
- FIG. 1 shows a printing device
- FIG. 2 shows an alignment section
- FIG. 3 shows the alignment section in supervision
- FIG. 4 shows the alignment section in view
- FIG. 5 shows a stop of the alignment section.
- FIG. 1 shows a printing device 11 which conveys sheet-like recording material, here individual paper sheets, from input compartments 13 via a feed channel 14 to a printing station 12.
- the printing station 12 works according to the electrophotographic principle, the printing processes being controlled by a device controller 20.
- the printed individual sheets are then passed through a fixing station 17, in which the toner image which has been overprinted in the printing station 12 is fixed on the paper sheet.
- the paper sheets printed in this way are fed via an output path 18 to paper output compartments 19 or a paper output interface 19a for further processing in other devices.
- the device controller 20 is connected to all electronic components of the printing device, for example to the fixing station 17 and to the drive 21.
- the paper sheets are to be aligned in particular in front of the printing station 12 in the feed channel 14, so that the printed image can be printed on the paper in a precise position.
- such an alignment can also be carried out in the output path 18 or in the area of the output interface 19a in order to feed the sheets correctly aligned to further devices.
- the printing device 11 is connected to an external paper supply module 15, which is connected via a connecting channel 16 into the input area 13 of the printing can supply device 11 at an interface 24.
- a tunnel-shaped connecting channel 16 with a corresponding drive 22 is provided.
- the controller 20 of the printing device 11 is also connected to the drive 22 and to a controller 23 of the external supply module 15.
- connection tunnels are again provided, which can either be designed in exactly the same way as the connection channel 16 (with a lateral orientation) or as a simple transport module without a lateral paper orientation.
- Sheets of paper 2 come from the supply module 15 into the connecting channel 16 at a speed v 0 on a pair of transport rollers 3a into the connecting channel 16. They have a lateral offset S with respect to a desired transport position or reference edge 8.
- the front transport roller pair 3a of an alignment section transports the paper sheets onto a running surface 6 in the transport channel 16 until the front edge of the sheet reaches the area of a next transport device, namely a driven roller 5, on which a ball 4 rests.
- the ball 4 is freely supported in a ball cage 7 and only lies on the drive roller 5 with its own weight.
- the roller 5 is a Drive axis 9 driven at an angular velocity ⁇ .
- Three such identical roller pairs 4, 5 are provided within the transport channel 16 or the alignment section.
- the drive axis 9 is in each case at an acute angle ⁇ to the perpendicular to the transport direction A.
- the inclined roller 5 transports the sheet in an inclination at the angle ⁇ to the main transport direction A.
- Direction of transport at speed v a is .
- the inclined roller 5 or the ball 4 engages the paper sheet 2 in the edge region of the sheet 2 on the side of the reference edge 8 or the stop 1. If the paper sheet 2 rests on the stop 1, the roller 5 causes movement in the following only one sheet movement parallel to the transport direction A along the stop 1 with the speed v r .
- This movement is influenced by the components of the static and sliding friction of the inclined friction roller 5 acting on the paper sheet as well as by the weight force Fg of the exposed ball 4 acting on the paper sheet as well as by the peripheral speed of the roller 5 with its component v a • cos ⁇ .
- the resulting speed v r can be varied by varying the speed of the inclined roller 5, for example via a gear ratio or a controllable stepper motor of the general transport speed v 0 of the ' pressure device 11 can be adapted.
- the engagement of the obliquely arranged pairs of rollers / balls in the alignment section between the two pairs of rollers 3a and 3b takes place in the edge region of the paper sheet 2 on the side of the reference edge 8 or the stop 1.
- the pair of balls and rollers 4, 5 engages in each case on the incoming side of the paper sheet in the area of the corner near the stop.
- the engagement of the rollers / pairs of balls 4.5 thus takes place asymmetrically, i.e. outside the middle of the sheet on the stroke-side sheet half.
- the paper sheet Due to the movement sequence described above, the paper sheet is rotated towards the stop during the alignment process.
- the pivot point depends on the friction surface of the paper sheet. This is in turn determined by the coefficient of friction between the paper sheet (record carrier 2) and the running surface 6.
- the engagement of the roller-ball pairs 4, 5 in the marginal area of the paper sheet 2 and the frictional forces acting on the paper sheet 2 initially cause the paper sheet to rotate with its rear edge 26a toward the stop 1 or towards the reference edge 8. In the further course, the paper sheet 2 is then completely applied to the reference edge 8.
- the free mounting of the ball 4 in a ball cage 7 has the effect that an essentially asymmetrical, ie no preferred direction of friction force acts on the recording medium.
- the ball 4 thus does not horizontally determine the direction on the recording medium, in contrast to the roller 5, which specifies a clear preferred direction.
- FIG. 3 shows further details of the parts relevant for the function of the alignment device.
- the centers of the balls 4 and the rollers 5 are at a distance b from the stop 1. This distance is considerably smaller than the sheet length transverse to the main transport direction A. This prevents longitudinal folds or bumps from occurring in the paper sheet 2 in the course of the alignment process.
- the length of the alignment path is to be dimensioned as a function of the paper sizes to be processed, the maximum offset S to be corrected and the angle ⁇ present.
- record carriers types: paper, foils, labels; surfaces: rough, fine, coated; format: A4, A4, letter; weights: 40 g to approx. 300 g
- the distances between two rollers 5 or two balls 4 are smaller than the smallest paper size to be processed.
- V2A steel spheres or plastic spheres or spheres made of other materials suitable for spherical production that do not leave any stains due to abrasion on the recording medium are also suitable.
- the rollers 5 are arranged at an acute angle to the transport direction A in an angular range of 0> ⁇ ⁇ 40 °, preferably in the angular range between 5 ° and 15 °.
- the roller surface has high friction relative to the medium (paper) to be transported. Suitable roller surfaces for paper are e.g. Elastomer surfaces.
- Microcellular polyurethane foams with cell sizes between 120 and 160 ⁇ m and with a coefficient of friction compared to paper are particularly suitable for the present arrangement of an alignment and transport device in which the roller surfaces interact with the above-described ground balls made of V2A steel or Gals 1.2 and 2.0 especially between 1.5 and 1.7.
- the Shore hardness (A) of the polyurethane foam should be between 25 and 50, in particular between 30 and 45 or exactly 38.
- roller surfaces are flush with the running surface 6 ß, these surfaces can protrude about 0.5 to 3 mm above the transport plate 6 in other embodiments.
- the transport plate 6 has a corrugated or embossed surface and is provided, for example, from a 0.8 mm thick steel plate with an embossing depth of 1.2 mm. These depressions, which are provided at short intervals, ensure sufficient friction between the paper and the transport plate 6 and yet avoid excessive adhesion or static charging of the paper.
- the balls 4 are stored in a ball cage 7, for example with some play in a hollow cylinder.
- the ball cage 7 holds the ball 4 horizontally centered on the corresponding, driven roller 5.
- the bow 4 can be prevented from falling out by a clip closure or a jacket taper when the entire arrangement is tilted or transported.
- the pair of rollers 3b can be accelerated in a ramp-controlled manner at the end of the alignment section.
- the speed v a is selected to be lower than the process speed Vo within the alignment path.
- at least the roller 5 arranged on the output-side pair of transport rollers 3b is provided with a freewheel bearing 10 (see FIG. 4).
- This freewheel bearing 10 engages the drive axle 9 with the drive roller 5 when the drive roller 9 moves in the transport direction, but releases it when the drive roller 9 axis 9 stands or the drive roller 5 rotates faster than the drive roller 9 due to the faster movement of the output-side transport roller pair 3b.
- the sheet lying between the drive rollers 3b and the output-side ball-roller pair 5 can thus be freely accelerated within the alignment path.
- the freewheel bearing has a freewheel in the transport direction and locks against the transport direction. If the pair of balls and rollers on the input side also has such a freewheel, the paper sheet can be picked up non-destructively if it runs into the alignment path at a higher input speed (v 0 > v r ).
- the transport plate 6 and the stop 1 is shown in a sectional view. They are connected to each other to form a V-shaped receptacle 27, so that the paper sheet 2 is securely received.
- the stop 1 has a leg 28 which runs obliquely upwards, the transport plate 6 has the embossed depressions 29.
- the invention has been described using the example of a printing device. It is clear that the invention can also be used for alignment sections on other devices for processing sheets or documents. It does not matter whether just one sheet is aligned or a document that spans several sheets, such as a brochure or an envelope.
- the invention can thus be used in printing devices, copying machines, original scanners or also in other devices for processing documents, for example in enveloping systems, in collators, in document feeders or document discharge devices.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Registering Or Overturning Sheets (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19912234 | 1999-03-18 | ||
| DE19912234 | 1999-03-18 | ||
| PCT/EP2000/002374 WO2000056643A1 (de) | 1999-03-18 | 2000-03-17 | Verfahren und vorrichtung zur ausrichtung von einzelblättern in einem blattverarbeitungsgerät |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1161394A1 true EP1161394A1 (de) | 2001-12-12 |
| EP1161394B1 EP1161394B1 (de) | 2003-11-12 |
Family
ID=7901527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00920509A Expired - Lifetime EP1161394B1 (de) | 1999-03-18 | 2000-03-17 | Verfahren und vorrichtung zur ausrichtung von einzelblättern in einem blattverarbeitungsgerät |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1161394B1 (de) |
| DE (1) | DE50004422D1 (de) |
| WO (1) | WO2000056643A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3929327A (en) * | 1974-04-01 | 1975-12-30 | Addressograph Multigraph | Document transport and registration apparatus |
| US4266762A (en) * | 1979-08-29 | 1981-05-12 | Xerox Corporation | Sheet alignment and feeding apparatus |
| JPS56127532A (en) * | 1980-03-13 | 1981-10-06 | Ichikoh Ind Ltd | Aligning apparatus |
| US5582087A (en) * | 1990-06-11 | 1996-12-10 | Roll Systems, Inc. | High speed sheet feeder |
| JPH05294500A (ja) * | 1992-04-17 | 1993-11-09 | Tokyo Electric Co Ltd | 用紙搬送装置 |
| JPH08259049A (ja) * | 1995-03-22 | 1996-10-08 | Ace Denken:Kk | 媒体幅寄せ装置 |
| DE19514420C1 (de) * | 1995-04-19 | 1997-03-06 | Fraunhofer Ges Forschung | Dampfbremse für den Einsatz zur Wärmedämmung von Gebäuden |
-
2000
- 2000-03-17 DE DE50004422T patent/DE50004422D1/de not_active Expired - Lifetime
- 2000-03-17 WO PCT/EP2000/002374 patent/WO2000056643A1/de not_active Ceased
- 2000-03-17 EP EP00920509A patent/EP1161394B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0056643A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50004422D1 (de) | 2003-12-18 |
| WO2000056643A1 (de) | 2000-09-28 |
| EP1161394B1 (de) | 2003-11-12 |
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