EP0934221A2 - Method and devices for feeding sheetlike material into a printer or photocopier - Google Patents
Method and devices for feeding sheetlike material into a printer or photocopierInfo
- Publication number
- EP0934221A2 EP0934221A2 EP97945770A EP97945770A EP0934221A2 EP 0934221 A2 EP0934221 A2 EP 0934221A2 EP 97945770 A EP97945770 A EP 97945770A EP 97945770 A EP97945770 A EP 97945770A EP 0934221 A2 EP0934221 A2 EP 0934221A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- transport
- feed
- speed
- sheets
- 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
- B65H43/00—Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
- B65H2511/22—Distance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/10—Speed
Definitions
- the invention relates to a method for inputting sheet material into a printer or copier.
- a method for inputting sheet material an outer cover sheet is pulled off a sheet stack in response to a start signal and transported at a feed speed in the direction of a section of the transport path in which it is transported at an approximately constant desired transport speed which corresponds to the feed speed.
- a disadvantage of the known method for entering sheet material is that the distance between successive sheets varies. This is due to the fact that the frictional connection between the feed rollers or feed belts and the sheets is not 100% guaranteed, so that a so-called micro slip occurs.
- the micro-slip that occurs depends on the paper properties, e.g. Paper thickness and surface roughness. Adjusting the pull-in force, especially when pulling the sheets off the stack, also leads to a change in the distance between successive sheets. When the sheets are pulled off the stack, a minimal displacement of the sheets adjacent to the cover sheet cannot be prevented, so that the exact position of the sheet leading edge in the transport direction is also not known when the sheets are pulled in. The consequence, in turn, is that the distance between successive sheets changes.
- High-performance printers print over 100 sheets per minute. Fluctuations in sheet spacing between a lower and an upper limit inevitably lead to a loss of speed in printing compared to one Pressure with the lower limit. When specifying the number of sheets that can be printed per unit of time, the worst value must be assumed. However, the user wants a predictable, constant printing speed.
- the object of the first aspect of the invention is to specify a simple method for inputting sheet material which enables an approximately constant sheet spacing between the sheets which have been input one after the other.
- the first aspect of the invention is based on the knowledge that the sheet spacing can be set most easily when the sheets are drawn in, since a subsequent correction of a spacing would result in a change in the location of all subsequent sheets. It should be possible to set the distance both when falling below and when a target distance is exceeded. Therefore, in the first aspect of the invention, the transport of the sheet is delayed in such a way that a predetermined, equal distance is obtained between sheets transported immediately one behind the other until the section is reached. The distance between the sheets is thus adjusted when the sheets are drawn into the printer. If the feed speed is relatively low, there is little or no deceleration. However, if the feed speed is relatively high, it will take longer to set the desired distance. Even if the feed speed is lower than or equal to the transport speed, a distance can be set by retarding the cover sheet when it is pulled in, if the sheets are pulled from the stack at a smaller distance from one another than the predetermined same desired distance.
- Delaying the transport is a simple technical measure, which is carried out, for example, by stopping a feed device or by braking the same.
- the feed speed is greater than the transport speed of the sheets within the partial section. This measure provides delay time for regulating the distance. The distance when the sheets are pulled off can thus be increased and can also exceed the desired distance, which makes pulling off safer since the sheets are prevented from colliding with one another. Ultimately, the control range of the distance increases as the feed speed increases.
- the number of printed sheets per unit of time is not reduced by the first exemplary embodiment of the invention, since the feed speed in the worst case has the size of the transport speed, in which case there is little or no delay.
- Preliminary position at which the position of the sheet is determined ensures that the position of the blade can be used for further control processes.
- the varying position of the leaves in the leaf compartment has by recognizing the exact position of the leaf and building on it
- the sheet is stopped between the sheet stack and partial section and, after a holding time has expired, is preferably transported further at the feeding speed.
- the sheet is conveniently stopped at the pre-feed position.
- the holding time is dimensioned such that, seen in the transport direction, there is between the cover sheet and a previously peeled sheet of the sheet stack the same predetermined distance when the cover sheet is transported up to the partial removal. cut sets.
- the holding time can be determined by simple path-time calculations. The distance between the holding position and the transport device and the feed speed are known. Stopping can be implemented using stepper motors and / or clutches, for example.
- the invention relates to a device for drawing sheet material into a printer or copier, in particular for carrying out a method according to one of the preceding claims.
- the above-mentioned technical effects are also transferred to the device for feeding sheet material according to the second aspect of the invention.
- a pull-off roller acting on the cover sheet is used, with which the respectively removed sheet is fed to a feed belt, which then feeds the sheet to the transport device.
- Rolls and belts are equivalent technical means that can also be interchanged.
- the transport device detects the removed sheet before its rear edge is transported past the take-off roller. This measure ensures that the take-off roller, which is usually not arranged directly on the front edge of the sheet stack, can be unlocked by the transport device when the sheet is gripped until the sheet has been completely removed from the sheet stack. This prevents further sheets from being pulled off the sheet stack by the take-off roller before the cover sheet has been completely pulled off the sheet stack.
- the sheet position is detected with a first light barrier directly behind the feed device.
- the feeder is unlocked so that the sheet rests in a pre-feed position.
- a second light barrier is preferably arranged approximately at the predetermined distance in the transport direction behind the first light barrier.
- the control unit switches the feed device back into effect. The sheet in the pre-feed position is thus transported further at the specified distance from the previous sheet.
- the feed speed can be measured with the help of the two light barriers by measuring the duration of the transport of a sheet between the two light barriers.
- the point in time at which the sheet is gripped by the transport device can be derived from the feeding speed, so that the feeding device can be activated at this point in time.
- the feed speed can be used to calculate when the removed sheet is at a minimum distance from the stack. If the minimum distance is reached, the control unit switches the feed device back into effect so that a next sheet is pulled off.
- a corresponding control unit has become known, for example, in the field of letter mail processing from DE 27 58 007 A.
- the invention in a third aspect, relates to a method for inputting sheet material into a printer or copier, which can be used in combination with the method according to the first aspect of the invention or else separately.
- the method according to the third aspect of the invention is intended to prevent multiple sheet feeds.
- multiple sheet feeders at least two at least partially overlapping sheets are pulled off the sheet stack at the same time. The result is increased sheet consumption and possibly misprints. A misprint is inevitable if the sheets are printed on both sides.
- a known measure for preventing multiple sheet feeding is a increase the pressing force of a puller when pulling the sheets from the sheet stack. However, this measure cannot prevent all multiple or double sheet feeds. Double-sheet feeds occur, for example, when the paper quality is poor or on cut edges with burrs.
- the object of the third aspect of the invention is to prevent multiple feeds when inputting sheet material into a printer or copier.
- Retraction speed can be varied according to a clock signal with little circuitry or software expenditure.
- the feed speed is only varied when multiple sheet feeds occur. Varying the pull-in speed can be activated by both an operator and a sensor unit. Thus, the variation of the lead to increased wear Feed speed is only carried out if, due to the paper quality, an increased number of multiple or double-sheet feeds is to be expected. In addition, due to the varying feeding speed, there is usually a loss of speed when feeding the sheets, which is only acceptable if there is actually a risk of multiple sheet feeding.
- the invention relates to a device for drawing sheet material into a printer or copier, in particular for carrying out the method according to the third aspect of the invention.
- the technical effects mentioned in the third aspect of the invention also apply to the device according to the fourth aspect of the invention.
- FIG. 1 shows a schematic illustration of a feeding device for feeding sheet material into a printer
- FIG. 2 shows a path-time diagram to illustrate a distance control
- Figure 3 is a path-time diagram to illustrate a distance control with vibrating.
- FIG. 1 shows the side view of a feed device 10 for pulling paper sheets 12, 14 from a stack of sheets 16.
- the components of the feed device 10 are carried by a frame 18, to which a lever 20, which can be pivoted around one end, is also attached. At the other end of the lever 20 there is a take-off roller 22 which is pressed against the sheet stack 16 with the aid of a spring (not shown).
- a conveyor belt 28 is tensioned.
- Un ⁇ indirectly located on the transport belt 28 near the transport roller 24 is a non-rotating stop roll 30 on to which the ribbon Trans ⁇ port about an angle of 170 ° is passed.
- a counter roller 32 is in contact with the conveyor belt 28 in the region of the conveyor roller 26.
- a stepper motor is connected via a coupling device to the take-off roller 22, the transport roller 24 and the counter-rotation ⁇ roller 32, so that the withdrawal roller 22 in the direction of an arrow 34, the conveyor belt 28 in the direction of an arrow 36 and the counter-roller 32 in Direction of an arrow 38 rotates.
- the surfaces of the draw-off roller 22, the conveyor belt 28 and the Ge ⁇ genlaufrolle 32 is made of a rubberized material having a very high coefficient of friction.
- baffle 40 ensures that only a very ge ⁇ rings number of sheets 12, 14 of the sheet stack 16 at the same time may arrive to the stop roller 30th
- the cover sheet 12 As soon as the cover sheet 12 is gripped by the conveyor belt 28, it moves in the transport direction 36 towards the counter-running roller 32. Supported by the counter-rotating roller 32, the respectively transported sheet is transported from the feed device 10 in the direction of an arrow 42 to a further transport device, which then transports the removed sheets past a printing unit and a fixing station to a sheet output.
- FIG. 2 shows a path-time diagram for three sheets 50, 52 and 54 drawn in, the transport path s being plotted on the ordinate axis 55 and the time t being plotted on the abscissa axis 57.
- the take-off roller 22 is located in the zero point of the ordinate axis 55 at the start of the transport path s of the sheets.
- positions a1 to a1 can be distinguished, which are arranged in this order along the transport path.
- the transport roller 24 is located at the position a1 and the stop roller 30 at the position a2.
- the difference between a position a3 and the position a2 characterizes a minimum distance between two successive sheets in the feeding device 10, the minimum distance being chosen such that a The following sheet is excluded from the previous sheet.
- the transport roller 26 and the counter-roller 32 are arranged at a distance a4.
- a first light barrier 56 is arranged in a position a5 such that a light beam is interrupted by a sheet being transported past.
- a position a6 is located between the light barrier 56 and a second light barrier 58 for detecting the sheet position at a position a7.
- a position a8 is located between the light barrier 58 and a first pair of transport rollers comprising transport rollers 60 and 62 of a transport device of the printer at a position a9. The meaning of the positions a6, a8 and a position alO in the transport direction directly behind the transport rollers 60, 62 is explained below.
- a third light barrier 64 seen in the transport direction, in front of a second pair of transport rollers comprising transport rollers 66, 68 at a position a1.
- the sheet 50 is drawn in by activating the feeding device 10 starting at a point in time t0.
- the leading edge 70 of the sheet 50 moves from the position a1 at a retraction speed vl, represented by a dashed line 70.
- the sheet 50 is the first sheet of a group of sheets 50, 52, 54, etc. to be drawn in and is therefore transported without a stop. Between the light barriers 56 and 58 the feed speed vl gemes ⁇ is sen.
- the transport rollers 60, 62 have securely gripped the sheet 50.
- the front edge 70 is transported further by the transport rollers 60, 62 at a transport speed vO which is lower than the feed speed vl.
- the transport speed v0 of the leading edge 70 and thus also of the sheet 50 is shown by a solid line. If the leading edge 70 passes the light barrier 58 at a point in time t2, then a point in time t3 can be calculated according to the following formula at which the leading edge 70 reaches the position alO:
- the rear edge of the sheet 50 is in front of the feed roller 22, as seen in the transport direction 36.
- the feed device 10 is released at time t3, i.e. the stepper motor, the feed roller 22, the conveyor belt 28 and the counter-running roller 32 no longer drive.
- the sheet 50 is thus only transported by the transport rollers 60, 62 at the transport speed vO, so that the rear edge 72 of the sheet 50 must also have the transport speed vO.
- the feeding device 10 is only activated again when the rear edge 72 of the sheet 50 reaches the position a3 at a time t4, which is calculated according to the following formula:
- L is the length of the sheets 50, 52 and 54 in the transport direction 36.
- the leading edge 74 of the next sheet 52 begins to move at the feed speed v1.
- the exact starting position of the leading edge 74 cannot be predicted exactly because it is between positions a1 and a2. In the worst case, however, the starting position of the leading edge 74 is, as shown in FIG. 2, the position a2.
- the safety distance a3-a2 is selected so that with the maximum retraction speed vl the front edge 74 cannot catch up with the rear edge 72 of the leading sheet 50 up to position a5.
- the sheet 52 is then stopped in a pre-drawing position. Stopping in the pre-drawing position takes place whenever there is a leading sheet in the area of the light barrier 58.
- a time t7 can be calculated if t2 is replaced by t5 in formula (1) and t7 by t3.
- the feed device 10 is released again.
- the front edge 74 is gripped by the transport rollers 60, 62 and is transported at the transport speed vO.
- a distance AI between the rear edge 72 and the front edge 74 now remains unchanged since both edges move at the same transport speed vO.
- the distance AI is smaller than a target distance AS.
- the distance AI is measured with the light barrier 64 and is known at a time t9 at which the front edge 74 reaches the position of all of the light barrier 64.
- the feed device 10 is activated again since, according to formula (2), the rear edge 74 of the sheet 52 has the position has reached a3.
- t3 must be replaced by t7 and t4 by t8.
- the front edge 78 of the sheet 54 moves at the retraction speed v1 to the pre-retraction position a5 on the light barrier 56.
- the retraction device 10 is consequently released at a time t10.
- the retraction device 10 is now not activated at a time tl2 at which the rear edge 76 passes the light barrier 58, but with a delay ⁇ tl with respect to the time tl2 at a time tl3 (see arrow P2a), which is calculated using the following formula :
- ⁇ Al is the distance by which the distance AI increases.
- the feed device 10 is again activated.
- a distance AI 'between the rear edge 76 and the front edge 78 now corresponds exactly to the target distance AS.
- the target distance AS is also set precisely between further sheets.
- the feed speed v1 is changed to a value vO which corresponds to the transport speed vO, the distances between the sheets 50, 52 and 54 are regulated in a similar manner.
- the feed speed changes e.g. when inserting a stack of sheets with sheets of different quality, by increasing the pressure force of the feed belt 28 on the stop roller 30.
- the sheet 50 is now started from the position a2 at the time t0, the leading edge 70 'moving at the feed speed v0. This speed is detected between the light barrier 56 and the light barrier 58, and in formulas (1) to (3) sets the value for the retraction speed vl. Otherwise, the sheet 50 is transported exactly as described above, and the control processes mentioned there are also carried out.
- Sheet 52 is started at time t4 with the leading edge at position a2 and the feed speed v0.
- the front edge 74 ' moves to position a5 where the light barrier 56 is located, i.e. to the pre-move position.
- the rear edge 72 of the sheet 50 passes the light barrier 58 again at time t5, so that at this time the feed device 10 is activated again and thus the sheet 52 continues to move at the feed speed vO (see arrow Pl).
- the leading edge 74' reaches the position A1, whereupon the feed device 10 is released.
- the light barrier 64 determines a distance A0 between the rear edge 72 and the front edge 74 '. This distance A0 is greater than the target distance AS.
- a delay time ⁇ tO is determined which has a negative sign.
- the distance A0 is used instead of AI and the new retraction speed vO is used instead of vl.
- the negative sign of ⁇ tO means that the sheets must be started from the pre-feed position before the rear edge, e.g. 76, the leading sheet passes the position a7 on the light barrier 58. Starting earlier from the advance position a5 results in a change in the distance ⁇ A0, which leads to a distance A0 'between the sheet 52 and the sheet 54 and is dimensioned such that the distance A0' is equal to the desired distance AS.
- the earlier start (cf. arrow P2b) can be carried out with the aid of the light barrier 56 by calculating a time t10 starting from a time t * at which the rear edge 76 passes the light barrier 56: ((a7 - a5) -
- ) tl0 t * + ! L (4), vO
- the vertical lines denote the amount operation.
- the target distance AS between the blades can be set in an analogous manner with the aid of the control described with reference to FIG.
- a constant distance at least between the leaves following the first leaf is of particular importance if the leaves m groups of e.g. six sheets each of a high-performance printer are fed, which has two printing units and m which transport paths cross between these two printing units.
- the transport routes can be made very short if the total length of a group of sheets can be defined within narrow limits. Short transport routes result in a compact design of the high-performance printer.
- FIG. 3 shows a path-time diagram for three drawn-in sheets 100, 102 and 104, the transport path s being plotted on the ordinate axis 106 and the time t on the abscissa axis 108.
- the path-time diagram with a representation of the drawing-in device 10 according to FIG. 1 is stored.
- the positions A1 to A12 explained with reference to FIG. 2 and the reference symbols 56 to 78 explained there are also entered in FIG. 3.
- the control of the sheet spacing between the sheets 100, 102 and 104 is carried out analogously to the control of the sheet spacing of the sheets 50, 52 and 54 according to FIG. 2 at the feed speed vl.
- FIG. 3 In contrast to FIG. 2, a jogger is used in FIG. 3 when pulling in a sheet, while the
- Leading edge 70, 74 and 78 between positions al and a5, ie moved between the transport roller 24 and the light barrier 56. If the leading edge of the sheet to be drawn is at the beginning of the drawing-in process between the position a1 and the position a2, the jogger takes place by a correspondingly shortened distance starting from the rest position of the respective leading edge.
- the feed device 10 is activated seven times and activated six times. The activation times are only about half as long as the times in which the feed device 10 is activated. If a sheet reaches the position a5 on the light barrier 56 with its front edge, the pull-in device 10 is further activated in the first sheet 100, so that the sheet 100 does not stop in the pre-drawing position. In the following sheets 102, 104, the feed device 10 is released as soon as the front edge 74, 78 m is in the pre-pull position, so that the sheet 102 or 104 m in the pre-pull position is stopped.
- the switch-on time of the feed device 10 is 60 ms in each case and the switch-off time in each case 10 ms, while the front edge of a sheet 100, 102 or 104 is between positions a1 and a5.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19643614 | 1996-10-22 | ||
DE19643614 | 1996-10-22 | ||
PCT/DE1997/002446 WO1998017563A2 (en) | 1996-10-22 | 1997-10-21 | Method and devices for feeding sheetlike material into a printer or photocopier |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0934221A2 true EP0934221A2 (en) | 1999-08-11 |
EP0934221B1 EP0934221B1 (en) | 2007-03-28 |
Family
ID=7809478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97945770A Expired - Lifetime EP0934221B1 (en) | 1996-10-22 | 1997-10-21 | Method and devices for feeding sheetlike material into a printer or photocopier |
Country Status (4)
Country | Link |
---|---|
US (1) | US6499733B1 (en) |
EP (1) | EP0934221B1 (en) |
DE (2) | DE59712832D1 (en) |
WO (1) | WO1998017563A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2797437B1 (en) * | 1999-08-09 | 2001-09-07 | Mannesmann Dematic Postal Automation Sa | DEVICE FOR CONVEYING FLAT OBJECTS WITH A SYNCHRONIZATION SYSTEM |
JP4345247B2 (en) * | 2001-07-24 | 2009-10-14 | ブラザー工業株式会社 | Recording device |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2613261C3 (en) * | 1976-03-27 | 1978-09-28 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Device for the successive delivery of letters from a stack |
IT1113526B (en) * | 1976-03-27 | 1986-01-20 | Licentia Gmbh | EQUIPMENT FOR SUBSEQUENT SUBMISSION OF SHIPPING ITEMS IN THE FORM OF LETTERS FROM A STACK |
JPS5497967A (en) * | 1978-01-19 | 1979-08-02 | Kopia Kk | Automatic paper feeder |
US4451027A (en) * | 1980-01-09 | 1984-05-29 | Burroughs Corp. | Constant spacing document feeder |
US4331328A (en) * | 1980-06-30 | 1982-05-25 | Burroughs Corporation | Controller for a servo driven document feeder |
US4523832A (en) * | 1982-09-21 | 1985-06-18 | Xerox Corporation | Sheet transport |
JPS59227639A (en) * | 1983-06-07 | 1984-12-20 | Ricoh Co Ltd | Method of controlling paper feeder |
JPS60236954A (en) * | 1984-05-08 | 1985-11-25 | Ricoh Co Ltd | Method of controlling frictional separation and feed for sheet |
JPS60236938A (en) * | 1984-05-09 | 1985-11-25 | Hitachi Ltd | Sheet separating device |
DE3424397A1 (en) * | 1984-07-03 | 1986-01-09 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | SINGLE DEVICE FOR FLAT OBJECTS |
US5121915A (en) * | 1989-11-20 | 1992-06-16 | International Business Machines Corporation | Document processor having improved throughput capabilities |
US5118089A (en) * | 1989-09-05 | 1992-06-02 | Konica Corporation | Automatic document feeding apparatus |
JP2700826B2 (en) * | 1989-09-14 | 1998-01-21 | コニカ株式会社 | Automatic document feeder |
WO1992016444A1 (en) * | 1991-03-21 | 1992-10-01 | Bell & Howell Phillipsburg Company | Constant gap document feeder and method of operation thereof |
JP2659344B2 (en) * | 1995-02-10 | 1997-09-30 | 日本電気ロボットエンジニアリング株式会社 | Friction feeding mechanism for paper sheets |
-
1997
- 1997-10-21 EP EP97945770A patent/EP0934221B1/en not_active Expired - Lifetime
- 1997-10-21 WO PCT/DE1997/002446 patent/WO1998017563A2/en active IP Right Grant
- 1997-10-21 DE DE59712832T patent/DE59712832D1/en not_active Expired - Fee Related
- 1997-10-21 DE DE19781150T patent/DE19781150D2/en not_active Expired - Lifetime
- 1997-10-21 US US09/284,817 patent/US6499733B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9817563A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO1998017563A2 (en) | 1998-04-30 |
WO1998017563A3 (en) | 1998-08-27 |
DE59712832D1 (en) | 2007-05-10 |
DE19781150D2 (en) | 1999-08-12 |
EP0934221B1 (en) | 2007-03-28 |
US6499733B1 (en) | 2002-12-31 |
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