EP1544686B1 - A printer as well as a method for controlling such a printer - Google Patents
A printer as well as a method for controlling such a printer Download PDFInfo
- Publication number
- EP1544686B1 EP1544686B1 EP04106461A EP04106461A EP1544686B1 EP 1544686 B1 EP1544686 B1 EP 1544686B1 EP 04106461 A EP04106461 A EP 04106461A EP 04106461 A EP04106461 A EP 04106461A EP 1544686 B1 EP1544686 B1 EP 1544686B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- feeder
- feeders
- amount
- printer
- receiving medium
- 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.)
- Not-in-force
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6502—Supplying of sheet copy material; Cassettes therefor
- G03G15/6508—Automatic supply devices interacting with the rest of the apparatus, e.g. selection of a specific cassette
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/44—Simultaneously, alternately, or selectively separating articles from two or more piles
-
- 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
- B65H2511/10—Size; Dimensions
- B65H2511/15—Height, e.g. of stack
-
- 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
- B65H2511/40—Identification
Definitions
- the invention relates to a printer comprising a printing unit for printing on a receiving medium of a predetermined type, a plurality of feeders for holding receiving media, establishing means for establishing the type of receiving medium held by each of the said feeders.
- the invention furthermore relates to a method for printing a receiving medium of a predetermined type using a printer having a printing unit and a plurality of feeders for holding receiving media, the method comprising establishing the type of receiving medium held by each of the said feeders.
- a disadvantage is that a nearly empty feeder will only be fully emptied if also the other feeders holding the same type of receiving medium have been emptied. In this manner the printer will almost never comprise an empty feeder in which another type of receiving medium, for example receiving sheets having another format, another colour or another thickness can be inserted.
- the feeders will be used successively since after using one feeder, the amount of receiving sheets remaining therein will become less than the amount of receiving sheets in another feeder so that said other feeder with the larger amount will be selected by the control unit.
- all four feeders will be used successively and become empty at almost the same moment. At that moment the operator needs to replenish all feeders at the same time.
- a printer comprises means for determining, upon establishing that at least two feeders hold the predetermined type of receiving material, the amount of receiving medium which can be added to each of these at least two feeders up to a predetermined maximum amount, and selecting means for selecting the feeder to which the largest amount receiving medium can be added for feeding the receiving medium to the printing unit.
- the printer according to the invention gives the operator relatively much freedom to decide when he wants to replenish the feeders and which feeders he wants to replenish.
- An embodiment of the printer according to the invention is characterized in that the feeder closest to the printing unit is selected, for example by a control unit, in case there are more feeders to which the same largest amount of receiving medium can be added.
- the printer By selecting the feeder closest to the printing unit, the printer will be able to print relatively fast on the receiving medium.
- the lowest feeder is preferably selected.
- Another embodiment of the printer according to the invention is characterized in that the feeder which has the smallest amount of receiving medium therein is selected, for example by the control unit, in case there are more feeders having the same largest amount of receiving medium which can be added.
- feeders having a different predetermined maximum amount By feeders having a different predetermined maximum amount, the feeder which has the smallest amount of receiving medium left therein will be selected. This feeder will be emptied relatively quickly so that it will become available for other types of receiving medium.
- printer comprises level detector means for determining the amount of receiving medium available in the feeders, and also comprises subtraction means for subtracting the available amount from the predetermined maximum amount to obtain the amount of receiving medium which can be added to each feeder.
- a further embodiment of the printer according to the invention is characterized in that the printer comprises means for measuring the distance between a first level at which the feeder is filled with receiving medium up to the predetermined maximum amount and a second level up to which said feeder is actually filled with receiving medium.
- the amount of receiving medium which can be added can relatively easy be determined.
- the amount of receiving medium which can be added to each feeder can be determined relatively accurate or relatively rough in which latter case, there will be a kind of threshold.
- the amount of sheets can be determined by using increments equal to 100.
- the amount of sheets that can be added is determined as zero sheets, 100-200 sheets, 200-300 sheets etc.
- the invention also relates to a method for printing a receiving medium of a predetermined type using a printer having a printing unit and a plurality of feeders for holding receiving media, the method comprising establishing the type of receiving medium held by each of the said feeders, and, if the predetermined type of receiving material is held by at least two feeders, determining the amount of receiving medium which can be added to each of the said at least two feeders up to a predetermined maximum amount, and selecting the feeder to which the largest amount of receiving medium can be added for feeding the receiving sheet to the printing unit.
- Fig. 1 shows a part of a known printer comprising a printing unit (not shown), a plurality of feeders 1, 2, 3 for feeding receiving sheets 4 to the printing unit and a control unit (not shown) for controlling the printing processes.
- the printer may comprise a large number of feeders of which only three feeders are being shown.
- the same type of receiving sheets for example sheets with an A4-format, 80 grams, white colour are available.
- this is established automatically by the printer by using art known sensing means for sensing the type of receiving material.
- the type of receiving material is programmed by the operator and stored in a memory, for example a memory of a control unit of the printer.
- a predetermined maximum amount of receiving sheets 4 is MAX1
- the predetermined maximum amount of feeder 2 is MAX2
- the predetermined maximum amount of feeder 3 is MAX 3.
- the predetermined maximum amount MAX3 of feeder 3 is larger than the maximum amounts MAX1, MAX2 and is for example 3000 sheets.
- Fig. 2 shows a printer 5 comprising the three feeders as shown in fig. 1, a printing unit 6, a control unit 7 for controlling the printer 5 as well as a tray 8 in which sheets on which information is printed by printing unit 6 can be stored.
- the control unit may also consist of several subunits distributed over the printer.
- Other parts of the printing unit 6 are the imaging belt 20, charging station 21, printhead 22 with control unit 23, developing station 24, intermediate transfer belt 25 and transfer nip 26.
- EP 0 599 374 Such a printer is described in greater detail in European patent application EP 0 599 374 .
- the printer 5 comprises sensing means (not shown) for each feeder 1, 2, 3 which sensing means is provided with level detector means for determining the amount of receiving sheets ⁇ 1, ⁇ 2, ⁇ 3 available in each feeder 1, 2, 3.
- the sensing means furthermore comprise subtracting means for subtracting the available amount ⁇ 1, ⁇ 2, ⁇ 3 from the predetermined maximum amount MAX1, MAX2, MAX3 to obtain the amount ADD1, ADD2, ADD3 of receiving sheets which can be added to each feeder 1, 2, 3.
- the control unit determines which feeder the largest amount of receiving sheets can be added.
- the feeder 3 will be selected since ADD3 (1400) is larger than ADD2 (400) and ADD1 (700).
- ADD3 (1400) is larger than ADD2 (400)
- ADD1 700
- the control unit it will then be decided to use feeder 1 since ADD1 is 700 larger than ADD2 (400).
- An operator can be informed about the available amount ⁇ 1, ⁇ 2, ⁇ 3 and/or the amount ADD1, ADD2, ADD3 of receiving sheets which can be added to each feeder, by means of a display (not shown) or by indicator means (not shown) on each feeder 1, 2, 3 or by opening each feeder 1, 2, 3.
- the operator can then replenish the feeder 3 with a relatively large amount of receiving sheets. After replenishing the empty feeder 3, the control unit will continue with emptying feeder 1. After feeder 1 is being emptied, the control unit will select feeder 2 since after emptying feeder 1 and replenishing feeder 3 up to the maximum amount MAX3, feeder 2 has the largest amount ADD2 of receiving sheets which can be added. The operator can replenish feeder 1 before feeder 2 is fully emptied or can replenish both feeders 1 and 2 after the feeder 2 is also emptied. Preferably a feeder 1, 2, 3 is not replenished whilst a feeder 1, 2, 3 is being used as feeder for feeding a receiving sheet to the printing unit, to prevent disruption of the printing process. If a feeder is being opened another feeder will be selected temporarily.
- sensing means having means for measuring between a first level LM1, LM2, LM3 at which the feeder 1, 2, 3 is filled with receiving sheets 4 up to the predetermined maximum amount MAX1, MAX2, MAX3 and a second level L1, L2, L3 up to which said feeder 1, 2, 3 is actually filled with receiving sheet 4.
- Said distance D1, D2, D3 is a measure for the amount of receiving sheets which can be added, whereby the largest distance, in this example D3, corresponds with the largest amount of receiving sheets which can be added.
- Fig. 3 shows another kind of feeder 9 in which the stack of receiving sheets 4 is located on a platform 10 which is movable under spring force in upward direction until the upper sheet 4 is located against a transport roller 11.
- the level L4 of the platform 10 is being determined by means of the control unit 7 in which also a maximum level LM4 of the platform 10 is being stored. The difference between the maximum level LM4 and L4 provides the control unit 7 with information about the actually amount of receiving sheets in the feeder 9 whilst the level L4 is a direct measure for the amount of receiving sheets which can be added to the feeder 9.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
- Handling Of Cut Paper (AREA)
Description
- The invention relates to a printer comprising a printing unit for printing on a receiving medium of a predetermined type, a plurality of feeders for holding receiving media, establishing means for establishing the type of receiving medium held by each of the said feeders.
- The invention furthermore relates to a method for printing a receiving medium of a predetermined type using a printer having a printing unit and a plurality of feeders for holding receiving media, the method comprising establishing the type of receiving medium held by each of the said feeders.
- From
US 4,783,889 such a printer is known. This printer allows automatic changing of paper feed sources when a first paper feed source runs empty. The next paper source is chosen in accordance with the highest priority rank and the largest paper capacity. Thus, a paper feed source with a lower capacity will not by chosen over another source, holding the same paper, and having a higher capacity. - From
US-patent 4,885,613 another printer is known which comprises a plurality of feeders which can hold the same receiving medium, in the form of a roll or sheets, whereby said feeder is selected comprising the largest amount of recording medium remaining thereon. - In such a printer a disadvantage is that a nearly empty feeder will only be fully emptied if also the other feeders holding the same type of receiving medium have been emptied. In this manner the printer will almost never comprise an empty feeder in which another type of receiving medium, for example receiving sheets having another format, another colour or another thickness can be inserted. The feeders will be used successively since after using one feeder, the amount of receiving sheets remaining therein will become less than the amount of receiving sheets in another feeder so that said other feeder with the larger amount will be selected by the control unit. In case that there are, for example four feeders comprising same type of receiving sheets, all four feeders will be used successively and become empty at almost the same moment. At that moment the operator needs to replenish all feeders at the same time. By using the feeders successively, many feeder changes, involving relatively elaborate operator handling, will occur.
FromJP 61 124448 JP 57 167042
FromUS 5,301,936 a printer is known which selects a next paper source in accordance with a priority criterion directed at a preferential feed direction. This selection is not optimised for the number of paper source switchings. - It is an object of the invention to provide a printer whereby the feeders will be used in a more optimised manner.
- This object is being achieved by a printer according to claim 1 in that the printer comprises means for determining, upon establishing that at least two feeders hold the predetermined type of receiving material, the amount of receiving medium which can be added to each of these at least two feeders up to a predetermined maximum amount, and selecting means for selecting the feeder to which the largest amount receiving medium can be added for feeding the receiving medium to the printing unit.
By feeding receiving sheets out of the feeder to which the largest amount of receiving medium can be added, this feeder will be fully emptied before another feeder will be selected. In this matter only a relatively small number of feeder changes will occur. Since the feeder which is being selected will be fully emptied before another feeder will be selected, said feeder will become available for another type of receiving medium, if necessary. Furthermore, if an operator wants to replenish the feeders, he can add a relatively large amount of receiving sheets to the feeder which is at that moment being selected by the control unit as feeder for feeding receiving sheets to the printing unit. - The printer according to the invention gives the operator relatively much freedom to decide when he wants to replenish the feeders and which feeders he wants to replenish.
- An embodiment of the printer according to the invention is characterized in that the feeder closest to the printing unit is selected, for example by a control unit, in case there are more feeders to which the same largest amount of receiving medium can be added.
- By selecting the feeder closest to the printing unit, the printer will be able to print relatively fast on the receiving medium.
- In case there are more feeders at the same distance to the printing unit, the lowest feeder is preferably selected.
- Another embodiment of the printer according to the invention is characterized in that the feeder which has the smallest amount of receiving medium therein is selected, for example by the control unit, in case there are more feeders having the same largest amount of receiving medium which can be added.
- By feeders having a different predetermined maximum amount, the feeder which has the smallest amount of receiving medium left therein will be selected. This feeder will be emptied relatively quickly so that it will become available for other types of receiving medium.
- Yet another embodiment of the printer according to the invention is characterized in that the printer comprises level detector means for determining the amount of receiving medium available in the feeders, and also comprises subtraction means for subtracting the available amount from the predetermined maximum amount to obtain the amount of receiving medium which can be added to each feeder.
- In this manner the amount of receiving medium that can be added to each feeder can be determined relatively easy.
- A further embodiment of the printer according to the invention is characterized in that the printer comprises means for measuring the distance between a first level at which the feeder is filled with receiving medium up to the predetermined maximum amount and a second level up to which said feeder is actually filled with receiving medium.
- By measuring said distance, the amount of receiving medium which can be added can relatively easy be determined.
- The amount of receiving medium which can be added to each feeder can be determined relatively accurate or relatively rough in which latter case, there will be a kind of threshold. For example, the amount of sheets can be determined by using increments equal to 100. In the latter case for example, the amount of sheets that can be added is determined as zero sheets, 100-200 sheets, 200-300 sheets etc.
- The invention also relates to a method for printing a receiving medium of a predetermined type using a printer having a printing unit and a plurality of feeders for holding receiving media, the method comprising establishing the type of receiving medium held by each of the said feeders, and, if the predetermined type of receiving material is held by at least two feeders, determining the amount of receiving medium which can be added to each of the said at least two feeders up to a predetermined maximum amount, and selecting the feeder to which the largest amount of receiving medium can be added for feeding the receiving sheet to the printing unit.
- Due to this method a once chosen feeder will be fully emptied before another feeder will be selected unless another empty feeder will be refilled with a very small amount of paper, in case of which this feeder will be selected. In this manner feeders will be emptied relatively fast and become available for other types of receiving media. Furthermore an operator will have a relatively large freedom by replenishing the feeders.
- The invention will further be explained with reference to the drawing in which
- fig. 1 shows schematically a set of feeders of a printer according to the invention,
- fig. 2 shows a printer according to the invention,
- fig. 3 shows schematically a feeder comprising sensing means according to the invention.
- Fig. 1 shows a part of a known printer comprising a printing unit (not shown), a plurality of
feeders receiving sheets 4 to the printing unit and a control unit (not shown) for controlling the printing processes. The printer may comprise a large number of feeders of which only three feeders are being shown. In said three feeders the same type of receiving sheets, for example sheets with an A4-format, 80 grams, white colour are available. In this embodiment, this is established automatically by the printer by using art known sensing means for sensing the type of receiving material. In another embodiment, the type of receiving material is programmed by the operator and stored in a memory, for example a memory of a control unit of the printer. In feeder 1 a predetermined maximum amount ofreceiving sheets 4 is MAX1, the predetermined maximum amount offeeder 2 is MAX2 and the predetermined maximum amount offeeder 3 is MAX 3. The maximum amount for thefeeders 1, 2 is the same so that MAX1 = MAX2, whereby MAX1 is for example 1000 sheets. The predetermined maximum amount MAX3 offeeder 3 is larger than the maximum amounts MAX1, MAX2 and is for example 3000 sheets. - Fig. 2 shows a
printer 5 comprising the three feeders as shown in fig. 1, a printing unit 6, acontrol unit 7 for controlling theprinter 5 as well as atray 8 in which sheets on which information is printed by printing unit 6 can be stored. Although depicted as onesingle unit 7, it is clear that the control unit may also consist of several subunits distributed over the printer. Other parts of the printing unit 6 are theimaging belt 20,charging station 21,printhead 22 withcontrol unit 23, developingstation 24, intermediate transfer belt 25 andtransfer nip 26. Such a printer is described in greater detail in European patent applicationEP 0 599 374 . - The
printer 5 comprises sensing means (not shown) for eachfeeder feeder feeder - By the feeders as shown in fig. 1, the feeder 1 comprises for example an amount Δ1 of 300
receiving sheets 4 so that ADD1 is 1000 - 300 = 700. Infeeder 2 the available amount Δ2 is 600 so that ADD2 is 1000 - 600 = 400. Infeeder 3 the available amount Δ3 is 1600 so that ADD3 is 3000 - 1600 = 1400. It is not absolutely necessary to determine the exact amount ofreceiving sheets 4 but a rough estimation round up to hundreds might work as well. - By the control unit it will now be determined to which feeder the largest amount of receiving sheets can be added. By the example given above, the
feeder 3 will be selected since ADD3 (1400) is larger than ADD2 (400) and ADD1 (700). By selectingfeeder 3, several printing processes can be done by using thisfeeder 3 untilfeeder 3 is fully emptied. By the control unit it will then be decided to use feeder 1 since ADD1 is 700 larger than ADD2 (400). An operator can be informed about the available amount Δ1, Δ2, Δ3 and/or the amount ADD1, ADD2, ADD3 of receiving sheets which can be added to each feeder, by means of a display (not shown) or by indicator means (not shown) on eachfeeder feeder feeder 3 with a relatively large amount of receiving sheets. After replenishing theempty feeder 3, the control unit will continue with emptying feeder 1. After feeder 1 is being emptied, the control unit will selectfeeder 2 since after emptying feeder 1 and replenishingfeeder 3 up to the maximum amount MAX3,feeder 2 has the largest amount ADD2 of receiving sheets which can be added. The operator can replenish feeder 1 beforefeeder 2 is fully emptied or can replenish bothfeeders 1 and 2 after thefeeder 2 is also emptied. Preferably afeeder feeder - Instead of determining the amount Δ1, Δ2, Δ3 it is also possible to provide the printer with sensing means having means for measuring between a first level LM1, LM2, LM3 at which the
feeder sheets 4 up to the predetermined maximum amount MAX1, MAX2, MAX3 and a second level L1, L2, L3 up to which saidfeeder sheet 4. Said distance D1, D2, D3 is a measure for the amount of receiving sheets which can be added, whereby the largest distance, in this example D3, corresponds with the largest amount of receiving sheets which can be added. - Fig. 3 shows another kind of feeder 9 in which the stack of receiving
sheets 4 is located on aplatform 10 which is movable under spring force in upward direction until theupper sheet 4 is located against a transport roller 11. The level L4 of theplatform 10 is being determined by means of thecontrol unit 7 in which also a maximum level LM4 of theplatform 10 is being stored. The difference between the maximum level LM4 and L4 provides thecontrol unit 7 with information about the actually amount of receiving sheets in the feeder 9 whilst the level L4 is a direct measure for the amount of receiving sheets which can be added to the feeder 9.
Claims (6)
- A printer (5) comprising a printing unit (6) for printing on a receiving medium (4) of a predetermined type, a plurality of feeders (1, 2, 3) for holding receiving media (4), establishing means for establishing the type of receiving medium (4) held by each of the said feeders (1, 2, 3) chararacterized in that the printer (5) comprises means for determining, upon establishing that at least two feeders (1, 2, 3) hold the predetermined type of receiving material (4), the amount of receiving medium which can be added to each of these at least two feeders (1, 2, 3) up to a predetermined maximum amount, and selecting means for selecting the feeder (1, 2, 3) to which the largest amount of receiving medium (4) can be added, for feeding the receiving medium (4) to the printing unit (6).
- A printer (5) according to claim 1, characterized in that the feeder (1, 2, 3) closest to the printing unit (6) is selected, in case there are more feeders (1, 2, 3) to which the same largest amount of receiving medium (4) can be added.
- A printer (5) according to claim 1 or 2, characterized in that the feeder (1, 2, 3) which has the smallest amount of receiving medium therein is selected in case there are more feeders (1, 2, 3) having the same largest amount of receiving medium (4) which can be added.
- A printer (5) according to one of the preceding claims, characterized in that the printer (5) comprises level detector means for determining the amount of receiving medium (4) available in the feeders, and also comprises subtraction means for subtracting the available amount from the predetermined maximum amount to obtain the amount of receiving medium (4) which can be added to each feeder (1, 2, 3).
- A printer (5) according to one of the preceding claims, characterized in that the printer (5) comprises means for measuring the distance between a first level at which the feeder is filled with receiving medium up to the predetermined maximum amount and a second level up to which said feeder is actually filled with receiving medium.
- Method for printing a receiving medium (4) of a predetermined type using a printer (5) having a printing unit (6) and a plurality of feeders (1, 2, 3) for holding receiving media (4), the method comprising establishing the type of receiving medium held by each of the said feeders (1, 2, 3), and, if the predetermined type of receiving material (4) Is held by at least two feeders (1, 2, 3), determining the amount of receiving medium which can be added to each of the said at least two feeders (1, 2, 3) up to a predetermined maximum amount, and selecting the feeder (1, 2, 3) to which the largest amount of receiving medium (4) can be added for feeding the receiving sheet to the printing unit (6).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04106461A EP1544686B1 (en) | 2003-12-19 | 2004-12-10 | A printer as well as a method for controlling such a printer |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03079005 | 2003-12-19 | ||
EP03079005 | 2003-12-19 | ||
EP04106461A EP1544686B1 (en) | 2003-12-19 | 2004-12-10 | A printer as well as a method for controlling such a printer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1544686A1 EP1544686A1 (en) | 2005-06-22 |
EP1544686B1 true EP1544686B1 (en) | 2007-07-04 |
Family
ID=34524739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04106461A Not-in-force EP1544686B1 (en) | 2003-12-19 | 2004-12-10 | A printer as well as a method for controlling such a printer |
Country Status (1)
Country | Link |
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EP (1) | EP1544686B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57167042A (en) * | 1981-04-09 | 1982-10-14 | Canon Inc | Copying apparatus having preferential mode |
US4763889A (en) * | 1981-08-13 | 1988-08-16 | Canon Kabushiki Kaisha | Paper feeder |
JPS61124448A (en) * | 1984-11-17 | 1986-06-12 | Ricoh Co Ltd | Device for controlling copying machine |
JP2657014B2 (en) * | 1991-07-30 | 1997-09-24 | シャープ株式会社 | Paper feeder |
-
2004
- 2004-12-10 EP EP04106461A patent/EP1544686B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
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EP1544686A1 (en) | 2005-06-22 |
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