EP2018972A1 - Method and device for double-sided printing - Google Patents
Method and device for double-sided printing Download PDFInfo
- Publication number
- EP2018972A1 EP2018972A1 EP07290932A EP07290932A EP2018972A1 EP 2018972 A1 EP2018972 A1 EP 2018972A1 EP 07290932 A EP07290932 A EP 07290932A EP 07290932 A EP07290932 A EP 07290932A EP 2018972 A1 EP2018972 A1 EP 2018972A1
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- EP
- European Patent Office
- Prior art keywords
- recording medium
- printing
- path
- printed
- recording
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 abstract description 6
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
- B41J13/0009—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets control of the transport of the copy material
- B41J13/0027—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets control of the transport of the copy material in the printing section of automatic paper handling systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
- B41J13/0009—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets control of the transport of the copy material
- B41J13/0045—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets control of the transport of the copy material concerning sheet refeed sections of automatic paper handling systems, e.g. intermediate stackers
Definitions
- the invention relates to a method for double-sided printing of recording media according to the precharacterising clause of claim 1.
- Methods for double-sided printing of recording media comprising print units for one-sided printing are known, wherein after printing a first side of a sheet, the sheet is turned over and fed to the printing unit for a second time. The sheet is turned over in an output region or a reversing path provided for this purpose. In the process the sheet, once conveyed to the printing unit, is printed, turned over once, fed to the printing unit and printed again.
- the drawback of this method is that the time for printing a sheet on both sides is lengthened compared with one-sided printing of two sheets, both the process of turning over and the renewed feeding of the sheet to the printing unit lengthening the time, and the number of printed pages per unit of time, i.e. the printing speed, which according to the invention is measured as the number of printed sheets per unit of time, considerably decreasing compared with just one-sided printing of recording media.
- the object of the invention is therefore to disclose a method for double-sided printing of recording media of the type mentioned in the introduction, with which said drawbacks can be avoided and with which the printing speed decreases only slightly compared with one-sided printing and in which an existing device for one-sided printing can be used as a result of merely minor adaptation.
- the device can thereby be used for one-sided and double-sided printing of recording media, in particular paper, it being possible to change between one-sided and double-sided printing without mechanical intervention.
- the recording media With a print job which substantially constitutes a command to print a specific number of pages continuously, the recording media can be printed on both sides and with an immediately subsequent print job further recording media can be printed on one side, it being possible to change from one-sided to double-sided printing and vice versa without a pause, in particular without stopping the device. Operation for a user is thus simple and intuitive, whereby the device is particularly suitable for home or office use.
- the invention also relates to a device for double-sided printing of recording media according to the precharacterising clause of claim 9.
- the object of the invention is moreover to disclose a device for double-sided printing of recording media of the type mentioned in the introduction with which said drawbacks can be avoided and with which the printing speed decreases only slightly compared with one-sided printing and in which an existing device for one-sided printing can be used as a result of only minor adaptation.
- a device for one-sided printing in particular an already existing device, can be redesigned by way of simple adaptation measures, in particular by constructionally simple redesign measures, into the device for double-sided printing, wherein a printing path, an output path, a storage container and the - in particular at least one - receiving roller can be constructed so as to be identical to the device for one-sided printing, whereby the production and development costs of the device are low.
- Fig. 1 to 8 show a method for double-sided printing of recording media 2, preferably sheets, comprising a printing unit 13 for one-sided printing, a recording medium 2, after printing of a first side, again being via a duplex path 5 fed to the printing unit 13 for printing of the second side, and the recording media 2, before printing of a first side, being received by means of a receiving roller 12 from a storage container 11, in which method it is proposed so the speed of printing decreases only slightly compared with one-sided printing and so an existing device for one-sided printing can be used as result of merely minor adaptation that between printing the first side of one of the recording media 2 and the second side of the same recording medium 2 at least one side of a further recording medium 2 is printed.
- the device 1 can thus be used for one-side and double-sided printing of recording media 2, in particular paper, it being possible to change between one-sided and double sided printing without mechanical intervention.
- the recording media 2 can be printed on both sides and with an immediately subsequent print job further recording media 2 can be printed on one side, it being possible to change from one-sided to double-sided printing and vice versa without pausing the device 1, in particular the printer. Operation for a user is thus simple and intuitive, whereby the device 1 is particularly suitable for home and office use.
- Recording media 2 that are used can advantageously be paper and/or plastic sheets and can advantageously have standard sizes, for example the size of "A5" to "A3", in particular "A4", "US legal” and/or "US letter".
- a respective group of two recording media 2 - a first recording medium 22 and a second recording medium 23 - is printed on both sides, first of all the first side of the first recording medium 22 of the group being printed, after a first printing pause the first side of the second recording medium 23 of the group being printed, subsequently after a second printing pause the second side of the first recording medium 22 being printed and finally the second side of the second recording medium 23 being printed.
- the printing pause ensures that the first recording medium 22 returned into the duplex path 5 is sufficiently spaced apart from the second recording medium 23 and the first recording medium 22 is given sufficient time by the subsequent second recording medium 23 to return into the duplex path 5, the output path 4 of the first recording medium 22 being cleared before the second recording medium 23 is conveyed into the region of the output path 4.
- the pause is provided before printing of the recording medium 2, so the recording medium 2 is conveyed through the printing path 3 at constant speed and is conveyed uniformly through the printing unit 13 and the fixing unit 14. This ensures constant print results over the entire area and extent of the recording medium 2 and allows use of sensitive, in particular temperature-sensitive, recording media 2 without the risk of damage in the region of the printing unit 13 or in the region of the fixing unit 14.
- the first recording medium 22 is conveyed via the duplex path 5 and that during the second pause, in particular printing pause, and/or printing of the second side of the first recording medium 22 the second recording medium 23 is conveyed via the duplex path.
- Print steps of different recording media are thus executed simultaneously, whereby the capacity, in particular of the printing unit 13, is increased and the high and substantially constant print speed is thus ensured.
- At least the leading edge - viewed in the direction of movement 9 of the recording medium 2 - of the recording medium 2 in the duplex path 5 is arranged in the storage container 11 between the receiving roller 12 and the recording media 2.
- a recording medium brought into the duplex path 5 can thus be received by the - at least one - receiving roller 12 and be conveyed into the printing path 3 and in the process the same receiving roller 12 is used for receiving and conveying the recording media 2 into the printing path 3 for recording media 2 in the duplex path 5 and for recording media 2 in the storage container 11.
- the device can thus be constructed compactly, inexpensively and using few - in particular few moving - components.
- the duplex path 5 can be constructed so as to be spaced apart from at least one storage container 11. This allows a particularly short duplex path 5 and the length of time for guiding the recording medium 2 in the duplex path 5 can therefore be short.
- the recording medium 2 in the duplex path 5 is conveyed at least in certain sections by means of one drive roller 33 constructed with a freewheel and connected upstream of the receiving roller 12.
- the freewheel ensures that after the recording medium 2 has been captured by the receiving roller 12 and/or with the start of conveying of the recording medium 2 by the receiving roller 12, conveying of the recording medium 2 by the drive roller 33 is neither blocked nor hindered. This ensures gentle conveying of the recording media 2 between the duplex path 5 and the printing path 3, it being possible to reduce the error rate and to print even sensitive recording media 2 on both sides.
- the drive roller 33 is constructed without a freewheel, wherein for simultaneous conveying of the recording medium 2 by the receiving roller 12 and the drive roller 33 it can advantageously be provided that a conveying speed of receiving roller 12 and drive roller 33 are matched with each other, in particular are identical. In particular the conveying speed of the drive roller 33 can be variable.
- the drive roller 33 thus ensures that after the recording medium 2 has been captured by the receiving roller 12 and/or with the start of conveying of the recording medium 2 by the receiving roller 12, conveying of the recording medium 2 by the drive roller 33 is unhindered and this allows stress-free and/or deformation-free conveying and guiding of the recording medium 2.
- the leading edge - viewed in the direction of movement 9 of the recording medium 2 - of the recording medium 2 in the duplex path 5 is arranged in the storage container 11.
- a receiving mechanism, and in particular one which includes the receiving roller 12, in the region of the storage container 11 can thus be identical to a receiving mechanism in a device without a duplex path 5. This allows continued use of the existing receiving mechanism of the device without a duplex path 5, whereby the device 1 comprising the duplex path 5 can be retrofitted inexpensively and using simple measures.
- the drive roller 33 is arranged above the at least one storage container 11. This ensures the compact arrangement of the drive roller 33 and reliable conveying of the recording medium 2 in the duplex path 5.
- FIG. 1 shows the device 1 for double-sided printing of recording media 2, preferably sheets, comprising the printing unit 13 for one-sided printing, at least the duplex path 5 being provided for bringing the recording medium 2 from at least the reversing device 51 to the printing unit 13 for printing the second side, and the receiving roller 12 for receiving the recording medium 2 from a storage container being provided, in which method it is proposed that the receiving roller 12 is arranged along the duplex path 5, and that the drive roller 33 connected upstream of the receiving roller 12 in the duplex path 5 comprises a freewheel.
- a device, in particular an existing device, for one-sided printing can be converted by way of simple adaptation measures, in particular by simple constructional conversion measures, into the device 1 for double-sided printing, wherein a printing path 3, an output path 4, a storage container 11 and the - in particular at least one - receiving roller 12 can be constructed so as to be identical to the device for one-sided printing, whereby the production and development costs are low.
- the spacing between the drive roller 33 and the receiving roller 12 is less than the length - viewed in the direction of movement of the recording medium - of the receiving region 18 of the storage container 11, the size of the receiving region 18 of the storage container 11 corresponding in particular to the area or size of the recording means 2 that is to be received.
- Compact arrangement of the drive roller 33 and reliable conveying of the recording medium 2 in the duplex path 5 is thereby ensured, it being possible to ensure a particularly gentle transition of the recording media 2 from the duplex path 5 to the printing path 3 by means of the freewheel of the recording media 2 and to reduce the error rate and to print even sensitive recording media 2 on both sides.
- Fig. 1 schematically shows in profile a device 1 for double-side printing of recording media 2 of a particularly preferred embodiment.
- the printing path 3, the output path 4 and the duplex path 5 guide the recording medium 2 through the device 1, these paths forming the path of movement for the recording medium 2.
- a reversing path specially provided for this purpose and comprising return pulleys 42 may be formed.
- the time for turning over the recording media 2 can be particularly short as a result.
- Fig. 1 the complete procedure of double-sided printing of one of the recording media 2 will be described, wherein further recording media 2 that are moved at the same time will not be considered.
- This procedure corresponds to a double-sided print job, the print job substantially constituting a command to continuously print a predetermined number of pages of a recording medium 2.
- the recording medium 2 is printed on the first side in the printing path 3.
- a plurality of storage containers 11 that are different from each other, in particular for recording media 2 of different sizes, areas and/or thicknesses and different orientation of the recording media 2, and/or at least one feeding chute for manually feeding the recording media 2, can advantageously also be provided, it being possible to form a plurality of feed rollers 12, in particular ones which are arranged spatially separate from each other, in the device 1.
- the recording medium 2 is thereafter conveyed in its direction of movement 9 in the direction of a point of intersection 6 and furthermore into the output path 4.
- the point of intersection 6 is the region at which printing path 3, output path 4 and duplex path 5 meet and/or cross in certain sections.
- the recording medium 2 is conveyed by means of the output rollers 32 of the output device 41.
- the direction of movement 9 of the recording medium 2 is reversed, whereby the recording medium 2 is guided in the direction of the duplex path 5.
- the recording medium 2 is conveyed in the output path 4 in the direction of the duplex path 5 by means of duplex rollers 42 of a reversing device 51.
- Output rollers 32 and duplex rollers 42 can be constructed particularly advantageously as universal rollers 52.
- the direction of movement 9 of the recording medium 2 also is being reversed when the direction of rotation of the universal rollers 52 is reversed. This allows reliable and exact conveying, in particular guidance, of the recording medium 2 and only a small number of moving parts in or on the device 1, whereby production and maintenance are inexpensive.
- the point of intersection 6 is advantageously formed in such a way that a recording means 2 conveyed in the direction of the printing unit 13, in particular in the direction of the duplex path 5, is reliably guided in the duplex path 5, it being possible to advantageously construct the component forming the point of intersection 6 in one piece, whereby the device, in particular the printer, is compact and inexpensive and an existing model of a device for one-sided printing can be expanded by the duplex path 5 using simple and inexpensive measures.
- the recording medium 2 is conveyed by means of the drive rollers 33 further in the direction of the receiving rollers 12, it being possible to convey the recording medium 2 adjacent to or in the storage container 11 at least in certain sections.
- the duplex path 5 can be constructed in the device 1, in particular outside the region of the at least one storage container 11.
- Renewed take-up of the recording medium 2 is subsequently carried out by means of a predetermined control signal by the receiving rollers 12 or an alternative receiving mechanism.
- the recording medium 2 is again conveyed into the printing path 3, the second side of the recording medium 2 being printed.
- the recording medium 2 is again conveyed into the output path 4, the recording medium 2 being conveyed in the printing path 3 by means of the printing path rollers 15 and the control rollers 31 and the recording medium 2 again being guided through the point of intersection 6.
- the recording medium 2 is conveyed in the output path 4 by means of the output rollers 32. Since the recording medium 2 has already been printed on both sides at this point in time it is ejected through the output opening (not shown) and conveyed into an output tray (not shown), wherein the recording medium 2 in the output tray is ready for removal.
- Figures 2 to 8 schematically show in profile the device 1 according to Fig. 1 and a plurality of recording media 2, which are different from each other and are moved at the same time, during different steps, the progression of the method being shown continuously.
- the plurality of recording media 2 is shown in dot-dash lines.
- Different recording media 2 with the same area/size and thickness and different area/size and/or thickness can be printed simultaneously, in particular in one print job.
- Figures 2 to 8 illustrate different steps of the method thereto, the choice of steps, in particular the number of chosen steps, being used merely for the purpose of illustration; a different division of method steps, i.e. division into individual steps, may also be chosen.
- Fig. 2 schematically shows in profile the device 1 of Fig. 1 and three recording media 2 which are different form each other: a zeroth recording medium 21, a first recording medium 22 and a second recording medium 23, during a first step.
- the zeroth recording medium 21 is situated in this case, i.e. during this step, in the printing path 3 and is printed on the second side in the process.
- the first recording medium 22 and the second recording medium 23 are situated in the storage container 11 and are not involved in the procedure during the first step.
- Fig. 3 schematically shows in profile the device 1 of Fig. 1 and the zeroth recording medium 21, the first recording medium 22 and the second recording medium 23 during a second step which immediately follows the first step.
- the zeroth recording medium 21 is situated in the output path 4 and as it has already been printed on both sides, is output through the output opening.
- the first recording medium 22 is printed on the first side, i.e. is printed on one side during this step.
- the second recording medium 23 is situated in the storage container and is not involved in the procedure during the second step.
- the zeroth recording medium 21 and the first recording medium 22 are successively arranged in the path of movement so as to be spaced apart with a only a slight spacing, in particular less than the length of the zeroth recording medium 21.
- Fig. 4 schematically shows in profile the device of Fig. 1 and the zeroth recording medium 21, the first recording medium 22 and the second recording medium 23 during a third step which follows the second step.
- the zeroth recording medium 21 is already situated fully in an output tray (not shown).
- the first recording medium 22 is situated in the output path 4 just before, after or at the time the direction of rotation of the output rollers 32 is reversed. After reversing the direction of rotation of the output rollers 32 and the corresponding reversal of the direction of movement 9 of the first recording medium 22 the first recording medium 22 is moved in the direction of the duplex path 5. In this case, i.e.
- the second recording medium 23 is in contact with the receiving roller 12, a predeterminable control signal controlling the intake and guidance of the second recording medium 23 in the printing path 3 and a pause, in particular a printing pause, being formed between printing of the first recording medium 22 and the second recording medium 23.
- the first recording medium 22 and the second recording medium 23 are successively arranged in the path of movement so as to be spaced apart by more than the length of the first recording medium 22.
- Fig. 5 schematically shows in profile the device of Fig. 1 and the zeroth recording medium 21, the first recording medium 22 and the second recording medium 23 during a fourth step which follows the third step.
- the zeroth recording medium 21 is situated fully in the output tray.
- the first recording medium 22 is situated in the duplex path 5 during this step.
- the second recording medium 23 is situated in the printing path 3 and is printed on the first side.
- Fig. 6 schematically shows in profile the device of Fig. 1 and the zeroth recording medium 21, the first recording medium 22 and the second recording medium 23 during a fifth step which follows the fourth step.
- the zeroth recording medium 21 is situated fully in the output tray.
- the first recording medium 22 is still in the duplex path 5, the conveying speed of the second recording medium 23 being reduced and/or conveying being paused for a predetermined unit of time and a pause, in particular a printing pause, is thus formed.
- the second recording medium 23 is situated in the output path 4 just before, after or at the time the direction of rotation of the output rollers 32 is reversed from the direction of rotation for moving the second recording medium 23 in the direction of the ejection opening to the direction of rotation for moving the second recording medium 23 in the direction of the duplex path 5.
- the direction of rotation of the output rollers 32 By reversing the direction of rotation of the output rollers 32 the corresponding direction of movement 9 of the second recording medium 23 is reversed.
- the second recording medium 23 and the first recording medium 22 can approach each other in the path of movement.
- the first recording medium 22 and the second recording medium 23 are successively arranged in the path of movement, in particular both are in the duplex path 5 at least in certain sections, so as to be successively spaced apart at a slight spacing, in particular less than the length of the second recording medium.
- Fig. 7 schematically shows in profile the device of Fig. 1 and the zeroth recording medium 21, the first recording medium 22 and the second recording medium 23 during a sixth step which follows the fifth step.
- the zeroth recording medium 21 is brought fully into the output tray.
- the first recording medium 22 is situated in the printing path 3 and is printed for a second time and on the second side. After printing the second side of the first recording medium 22 the first recording medium 22 is conveyed in the direction of the point of intersection 6.
- the second recording medium 23 is situated in the duplex path 5 and is already in contact with the receiving roller, the first recording medium 22 and the second recording medium 23 being successively arranged in the path of movement so as to be spaced apart at a slight spacing, in particular less than the length of the first recording medium 22.
- Fig. 8 schematically shows in profile the device 1 of Fig. 1 and the zeroth recording medium 21, the first recording medium 22 and the second recording medium 23 during a seventh step which follows the sixth step.
- the zeroth recording medium 21 is brought fully into the output tray.
- the second recording medium 22 is situated in the output path 4 and - since it is printed on both sides - is output through the output opening into the output tray.
- the second recording medium 23 is situated in the printing path 3 and is printed on the second side during the seventh step.
- the first recording medium 22 and the second recording medium 23 are successively arranged in the path of movement so as to be spaced apart at a slight spacing, in particular less than the length of the first recording medium 22.
- the second recording medium 23 is conveyed in the direction of the point of intersection 6, further in the direction of the output path 4 and through the output opening into the output tray, the direction of rotation of the output rollers 32 and the direction of movement 9 of the second recording medium 23 in the output path 4 not being reversed accordingly.
- the above-described method is not restricted to just three recording media 2, rather it may be understood as a continuous method, wherein between printing of the first side of one of the recording media 2 and the second side of the same recording medium 2 at least one side of a further recording medium 2 is printed on a recurring basis.
- the drive roller 33 is advantageously constructed with a freewheel. As soon as the recording medium 2 is moved more quickly in the path of movement than it would be moved by the drive roller 33, in particular as a result some other force effect, the drive roller 33 freewheels. As a result the recording medium 2 can simultaneously be conveyed by the drive roller 33 and the receiving roller 12 or a further receiving roller constructed in addition to the receiving roller 12. The freewheel thus ensures that even with a different drive speed of receiving roller 12 and drive roller 33, the recording medium 2 is conveyed over the entire surface of the recording medium 2 at a constant speed and thus no stresses or deformations occur in the recording medium 2 along the surface, in particular along the length in the direction of movement 9.
- Conveying of the recording medium 2 in the duplex path 5 is thus particularly gentle, it being possible to reliably convey even sensitive recording media 2.
- Different sizes, thicknesses and/or material types of recording media 2 can be particularly advantageously conveyed in the duplex path 5 which in particular comprises the drive roller 33 with the freewheel.
- Recording media 2 which differ from each other in particular in terms of area can be printed during one of the print jobs or in successive print jobs.
- High flexibility of the device 1 when choosing the recording media 2 is thus ensured, it being possible to print especially different recording media 2 with area ratios to each other of 1 to 4, in particular of 1 to 3, and/or length ratios of 1 to 2, in particular 1 to 1.5 in one print job and/or in successive print jobs.
- the recording media 2 of different size, in particular area, can in the process be arranged in different storage containers 11, wherein in particular one of the sizes is arranged in one of the storage containers 11 respectively.
- the spacing in the path of movement of two recording media 2 - a first recording medium 22 and a second recording medium 23 - which, in particular, can be constructed with different lengths in the direction of movement 9, can advantageously be guided by the length of the first of the two recording media, i.e. the first recording medium 22. It may particularly advantageously be provided in this connection that immediately after first printing of the first recording medium 22, i.e. on the first side of the first recording medium 22, the spacing between the first recording medium 22 and the second recording medium 23 in the path of movement is greater than the length of the first recording medium 22 in the direction of movement 9, and that immediately after second printing of the first recording medium 22, i.e.
- the spacing between the first recording medium 22 and the second recording medium 23 in the path of movement is less than the length of the first recording medium 22 in the direction of movement 9.
- the printing unit 13 is thus used particularly efficiently time-wise, the first recording medium 22 being given sufficient time to be conveyed fully into the output path 4 and from there back into the duplex path 5 without there being a risk of the first recording medium 22 and the second recording medium 23 coming into contact with other at the point of intersection or being conveyed into each other during double-sided printing. A low error rate and high reliability and print speed are thus ensured.
- the speed of movement of the recording medium 2 in the individual sections of the path of movement, i.e. in the printing path 3, the output path 4 and the duplex path 5, is different, in particular are in predetermined ratios to each other, these ratios can advantageously be considered when determining the spacing of the recording media 2 from each other in the path of movement.
- the method of double-sided printing can be accelerated by the partially quicker conveying of the recording medium 2, i.e. the movement which is faster in parts than in adjoining regions of the path, in particular of the printing path, , and printing-free time units, i.e. the time units without printing activity of the printing unit 13, are reduced. High utilisation and high time efficiency of the device 1 can thus be ensured.
- the storage container 11 can advantageously be constructed so as to be changeable in size to receive recording media 2 of different sizes.
- a plurality of storage containers 11 that are changeable in size and/or storage containers 11 of different size can likewise be constructed in or on the device 1.
- the recording media 2 can equally be supplied by means of one or more manual feed tray(s).
- the print job With a print job comprising a plurality of pages of a document for printing, the print job - at least print job internally and/or device-internally - beginning with page number one and with a constantly increasing page number extending to a predetermined page number, the printing sequence of the page numbers can advantageously be resorted, so the recording media 2 of a print job, printed on both sides, are output into the output tray with constantly increasing, sorting page numbers.
- the higher of the two page numbers to be printed on a recording medium 2 is printed on the first side of the recording medium 2, i.e. before turning the recording medium 2 over, wherein it is in particular provided that the sequence of page numbers to be printed is basically increasing, i.e. each recording medium 2 following one of the recording media 2 is printed with higher page numbers than the recording medium 2. It may thus be ensured that with double-sided printing of recording media 2 the document, after being output into the output tray, is output with constantly increasing page numbers and in the correct sort order.
- a reversed print sequence For the case where a reversed print sequence is chosen, with the print job - at least print job-internally and/or device-internally - beginning with a predetermined highest page number and with a constantly decreasing page number extending to page number one, it may advantageously be provided that the lower of the two page numbers to be printed on a recording medium 2 is printed on the first side of the recording medium 2, i.e. before the recording medium 2 is turned over, wherein it is in particular provided that the sequence of page numbers to be printed is basically decreasing, i.e. each recording medium 2 following one of the recording media 2 being printed with lower page numbers than the recording medium 2. It may thus be ensured for the reversed print sequence as well that with double-sided printing of recording media 2, the document, after being output into the output tray, is output with constantly increasing page numbers and in the correct sort order.
- the recording medium 2 printed first is guided in the duplex path 5 and again in the printing path 3 and in the process is turned over, the recording medium 2 being guided through the printing path 3 print-free, onwards into the output path 4 and is output. It can thus be ensured that even when printing in the reversed print sequence and for an uneven number of page numbers that with double-sided printing of recording media 2 the document is output in the correct sort order.
- a print image is produced on the page when printing a page of a recording medium 2.
- the print image of the second side of the recording medium 2 is advantageously rotated by 180° in comparison with the print image of the first side of the same recording medium 2. It can thus be ensured that after the recording medium 2 printed on both sides has been output, top and bottom on the first page and on the second page are arranged in the same region of the recording medium 2 and thus the recording medium 2 has only to be turned as usual for regarding, especially for reading, the first page and the second page.
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Abstract
Description
- The invention relates to a method for double-sided printing of recording media according to the precharacterising clause of
claim 1. - Methods for double-sided printing of recording media comprising print units for one-sided printing are known, wherein after printing a first side of a sheet, the sheet is turned over and fed to the printing unit for a second time. The sheet is turned over in an output region or a reversing path provided for this purpose. In the process the sheet, once conveyed to the printing unit, is printed, turned over once, fed to the printing unit and printed again. The drawback of this method is that the time for printing a sheet on both sides is lengthened compared with one-sided printing of two sheets, both the process of turning over and the renewed feeding of the sheet to the printing unit lengthening the time, and the number of printed pages per unit of time, i.e. the printing speed, which according to the invention is measured as the number of printed sheets per unit of time, considerably decreasing compared with just one-sided printing of recording media.
- The object of the invention is therefore to disclose a method for double-sided printing of recording media of the type mentioned in the introduction, with which said drawbacks can be avoided and with which the printing speed decreases only slightly compared with one-sided printing and in which an existing device for one-sided printing can be used as a result of merely minor adaptation.
- This is achieved according to the invention by the features of
claim 1. - This results in the advantage that at the same time as one recording medium is being turned over one side of a further recording medium is printed, whereby the printing speed is high even with double-sided printing. Quick double-sided printing by means of one printing unit for one-sided printing, the two sides being printed on one side at different times, is consequently possible using simple means and without technical modifications to the, in particular in development, expensive, printing unit. This consequently makes the inexpensive configuration and production of the printer possible, it being necessary to make only minor or no technical modifications to a printer for one-sided printing, particularly in the case of motors for conveying the recording media and in the case of the printing unit.
- The device can thereby be used for one-sided and double-sided printing of recording media, in particular paper, it being possible to change between one-sided and double-sided printing without mechanical intervention. With a print job which substantially constitutes a command to print a specific number of pages continuously, the recording media can be printed on both sides and with an immediately subsequent print job further recording media can be printed on one side, it being possible to change from one-sided to double-sided printing and vice versa without a pause, in particular without stopping the device. Operation for a user is thus simple and intuitive, whereby the device is particularly suitable for home or office use.
- The invention also relates to a device for double-sided printing of recording media according to the precharacterising clause of
claim 9. - The object of the invention is moreover to disclose a device for double-sided printing of recording media of the type mentioned in the introduction with which said drawbacks can be avoided and with which the printing speed decreases only slightly compared with one-sided printing and in which an existing device for one-sided printing can be used as a result of only minor adaptation.
- This is achieved according to the invention by the features of
claim 9. - As a result a device for one-sided printing, in particular an already existing device, can be redesigned by way of simple adaptation measures, in particular by constructionally simple redesign measures, into the device for double-sided printing, wherein a printing path, an output path, a storage container and the - in particular at least one - receiving roller can be constructed so as to be identical to the device for one-sided printing, whereby the production and development costs of the device are low.
- This results in the advantage that different formats, in particular different sizes and areas, of recording media can be printed on one side and one both sides by means of the same printing device and without external intervention. This ensures the high flexibility of the printing device with respect to different formats, areas and sizes of recording media, whereby ease of use can be ensured and the printing device is particularly suitable for home and office use.
- This allows subsequent conversion of the device for one-sided printing and the formation of conversion kits, whereby an existing device for one-sided printing can be converted by the user. As a result of double-sided printing paper consumption can be reduced in the home and office, whereby even with existing devices recording media consumption and costs can be lowered and the environment conserved.
- The sub-claims, which like
claim 1 also form part of the description, relate to further advantageous embodiments of the invention. - The invention will be described in more detail with reference to the accompanying drawings in which only preferred embodiments are illustrated by way of example and in which:
-
Fig. 1 schematically shows in profile a device for double-sided printing of recording media of a particularly preferred embodiment, -
Fig. 2 schematically shows in profile the device ofFig. 1 and three recording media during a first step, -
Fig. 3 schematically shows in profile the device ofFig. 1 and three recording media during a second step which follows the first step, -
Fig. 4 schematically shows in profile the device ofFig. 1 and three recording media during a third step which follows the second step, -
Fig. 5 schematically shows in profile the device ofFig. 1 and three recording media during a fourth step which follows the third step, -
Fig. 6 schematically shows in profile the device ofFig. 1 and three recording media during a fifth step which follows the fourth step, -
Fig. 7 schematically shows in profile the device ofFig. 1 and three recording media during a sixth step which follows the fifth step and -
Fig. 8 schematically shows in profile the device ofFig. 1 and three recording media during a seventh step which follows the sixth step. -
Fig. 1 to 8 show a method for double-sided printing ofrecording media 2, preferably sheets, comprising aprinting unit 13 for one-sided printing, arecording medium 2, after printing of a first side, again being via aduplex path 5 fed to theprinting unit 13 for printing of the second side, and therecording media 2, before printing of a first side, being received by means of areceiving roller 12 from astorage container 11, in which method it is proposed so the speed of printing decreases only slightly compared with one-sided printing and so an existing device for one-sided printing can be used as result of merely minor adaptation that between printing the first side of one of therecording media 2 and the second side of thesame recording medium 2 at least one side of afurther recording medium 2 is printed. - It is thereby possible that at the same time as one
recording medium 2 is being turned over, one side of afurther recording medium 2 is printed, whereby the printing speed is high even with double-sided printing. Quick double-sided printing is consequently possible using simple means and without technical modifications to the, in particular in development, expensive,printing unit 13 for one-sided printing. This consequently makes inexpensive configuration and production of the device, in particular the printer, possible. - The
device 1 can thus be used for one-side and double-sided printing ofrecording media 2, in particular paper, it being possible to change between one-sided and double sided printing without mechanical intervention. - With a print job which substantially constitutes a command to print a specific number of pages continuously, the
recording media 2 can be printed on both sides and with an immediately subsequent print job further recordingmedia 2 can be printed on one side, it being possible to change from one-sided to double-sided printing and vice versa without pausing thedevice 1, in particular the printer. Operation for a user is thus simple and intuitive, whereby thedevice 1 is particularly suitable for home and office use. -
Recording media 2 that are used can advantageously be paper and/or plastic sheets and can advantageously have standard sizes, for example the size of "A5" to "A3", in particular "A4", "US legal" and/or "US letter". - It can advantageously be provided that after printing the first side of a
first recording medium 2 and printing the second side of thesame recording medium 2 exactly one side of the preceding orsubsequent recording medium 2 is printed. This ensures the uniform print sequence, therecording medium 2 being output each time the second side of therecording medium 2 has been printed. - In an advantageous development of the invention it may be provided that a respective group of two recording media 2 - a first recording medium 22 and a second recording medium 23 - is printed on both sides, first of all the first side of the first recording medium 22 of the group being printed, after a first printing pause the first side of the
second recording medium 23 of the group being printed, subsequently after a second printing pause the second side of the first recording medium 22 being printed and finally the second side of thesecond recording medium 23 being printed. The printing pause ensures that the first recording medium 22 returned into theduplex path 5 is sufficiently spaced apart from thesecond recording medium 23 and the first recording medium 22 is given sufficient time by the subsequentsecond recording medium 23 to return into theduplex path 5, theoutput path 4 of the first recording medium 22 being cleared before thesecond recording medium 23 is conveyed into the region of theoutput path 4. It is particularly advantageous in this connection that the pause is provided before printing of therecording medium 2, so therecording medium 2 is conveyed through theprinting path 3 at constant speed and is conveyed uniformly through theprinting unit 13 and thefixing unit 14. This ensures constant print results over the entire area and extent of therecording medium 2 and allows use of sensitive, in particular temperature-sensitive, recordingmedia 2 without the risk of damage in the region of theprinting unit 13 or in the region of thefixing unit 14. - It may advantageously be provided in this connection that during the first pause, in particular the first printing pause and/or printing of the first side of the
second recording medium 23, the first recording medium 22 is conveyed via theduplex path 5 and that during the second pause, in particular printing pause, and/or printing of the second side of the first recording medium 22 thesecond recording medium 23 is conveyed via the duplex path. Print steps of different recording media are thus executed simultaneously, whereby the capacity, in particular of theprinting unit 13, is increased and the high and substantially constant print speed is thus ensured. - In an advantageous development of the invention it may be provided that at least the leading edge - viewed in the direction of
movement 9 of the recording medium 2 - of therecording medium 2 in theduplex path 5 is arranged in thestorage container 11 between thereceiving roller 12 and therecording media 2. A recording medium brought into theduplex path 5 can thus be received by the - at least one -receiving roller 12 and be conveyed into theprinting path 3 and in the process thesame receiving roller 12 is used for receiving and conveying therecording media 2 into theprinting path 3 for recordingmedia 2 in theduplex path 5 and for recordingmedia 2 in thestorage container 11. The device can thus be constructed compactly, inexpensively and using few - in particular few moving - components. - Alternatively the
duplex path 5 can be constructed so as to be spaced apart from at least onestorage container 11. This allows a particularlyshort duplex path 5 and the length of time for guiding therecording medium 2 in theduplex path 5 can therefore be short. - Advantageously it may be provided that the
recording medium 2 in theduplex path 5 is conveyed at least in certain sections by means of onedrive roller 33 constructed with a freewheel and connected upstream of thereceiving roller 12. The freewheel ensures that after therecording medium 2 has been captured by thereceiving roller 12 and/or with the start of conveying of therecording medium 2 by thereceiving roller 12, conveying of therecording medium 2 by thedrive roller 33 is neither blocked nor hindered. This ensures gentle conveying of therecording media 2 between theduplex path 5 and theprinting path 3, it being possible to reduce the error rate and to print evensensitive recording media 2 on both sides. - Alternatively it may be provided that the
drive roller 33 is constructed without a freewheel, wherein for simultaneous conveying of therecording medium 2 by thereceiving roller 12 and thedrive roller 33 it can advantageously be provided that a conveying speed of receivingroller 12 anddrive roller 33 are matched with each other, in particular are identical. In particular the conveying speed of thedrive roller 33 can be variable. Thedrive roller 33 thus ensures that after therecording medium 2 has been captured by thereceiving roller 12 and/or with the start of conveying of therecording medium 2 by thereceiving roller 12, conveying of therecording medium 2 by thedrive roller 33 is unhindered and this allows stress-free and/or deformation-free conveying and guiding of therecording medium 2. - In an advantageous development it may be provided that the leading edge - viewed in the direction of
movement 9 of the recording medium 2 - of therecording medium 2 in theduplex path 5 is arranged in thestorage container 11. A receiving mechanism, and in particular one which includes thereceiving roller 12, in the region of thestorage container 11 can thus be identical to a receiving mechanism in a device without aduplex path 5. This allows continued use of the existing receiving mechanism of the device without aduplex path 5, whereby thedevice 1 comprising theduplex path 5 can be retrofitted inexpensively and using simple measures. - It can advantageously be provided that the
drive roller 33 is arranged above the at least onestorage container 11. This ensures the compact arrangement of thedrive roller 33 and reliable conveying of therecording medium 2 in theduplex path 5. - In addition to the method
figures 1 to 5 also show thedevice 1 for double-sided printing ofrecording media 2, preferably sheets, comprising theprinting unit 13 for one-sided printing, at least theduplex path 5 being provided for bringing therecording medium 2 from at least the reversing device 51 to theprinting unit 13 for printing the second side, and thereceiving roller 12 for receiving therecording medium 2 from a storage container being provided, in which method it is proposed that thereceiving roller 12 is arranged along theduplex path 5, and that thedrive roller 33 connected upstream of the receivingroller 12 in theduplex path 5 comprises a freewheel. - Consequently a device, in particular an existing device, for one-sided printing can be converted by way of simple adaptation measures, in particular by simple constructional conversion measures, into the
device 1 for double-sided printing, wherein aprinting path 3, anoutput path 4, astorage container 11 and the - in particular at least one - receivingroller 12 can be constructed so as to be identical to the device for one-sided printing, whereby the production and development costs are low. - This allows subsequent retrofitting of the device for one-sided printing and the formation of conversion kits, whereby the existing device for one-sided printing can be subsequently retrofitted. As a result paper consumption can be reduced in the home and office by means of the existing devices, it being possible to lower recording media consumption and costs and to conserve the environment.
- In this connection it may in a particularly advantageous development of the invention be provided that the spacing between the
drive roller 33 and the receivingroller 12 is less than the length - viewed in the direction of movement of the recording medium - of the receivingregion 18 of thestorage container 11, the size of the receivingregion 18 of thestorage container 11 corresponding in particular to the area or size of the recording means 2 that is to be received. Compact arrangement of thedrive roller 33 and reliable conveying of therecording medium 2 in theduplex path 5 is thereby ensured, it being possible to ensure a particularly gentle transition of therecording media 2 from theduplex path 5 to theprinting path 3 by means of the freewheel of therecording media 2 and to reduce the error rate and to print evensensitive recording media 2 on both sides. -
Fig. 1 schematically shows in profile adevice 1 for double-side printing ofrecording media 2 of a particularly preferred embodiment. Thedevice 1 ofrecording media 2, theprinting path 3, theoutput path 4, theduplex path 5, the output device 41, the reversing device 51, the output device 41 and the reversing device 51 being identical in the preferred embodiment, the direction ofmovement 9, thestorage container 11, the receivingroller 12, theprinting unit 13, the fixingunit 14,printing path rollers 15,control sensors 16,control rollers 31, output rollers 32, return pulleys 42, the output rollers 32 and the return pulleys 42 being identical in the preferred embodiment, and driverollers 33 are shown. Theprinting path 3, theoutput path 4 and theduplex path 5 guide therecording medium 2 through thedevice 1, these paths forming the path of movement for therecording medium 2. - Alternatively a reversing path specially provided for this purpose and comprising return pulleys 42 may be formed. The time for turning over the
recording media 2 can be particularly short as a result. - Using
Fig. 1 the complete procedure of double-sided printing of one of therecording media 2 will be described, whereinfurther recording media 2 that are moved at the same time will not be considered. This procedure corresponds to a double-sided print job, the print job substantially constituting a command to continuously print a predetermined number of pages of arecording medium 2. - The
recording medium 2, which at the start of the print job is situated in particular in thestorage container 11, is first of all captured by the receiving mechanism, in particular the receivingroller 12, and conveyed into theprinting path 3. Therecording medium 2 is printed on the first side in theprinting path 3. - A plurality of
storage containers 11 that are different from each other, in particular forrecording media 2 of different sizes, areas and/or thicknesses and different orientation of therecording media 2, and/or at least one feeding chute for manually feeding therecording media 2, can advantageously also be provided, it being possible to form a plurality offeed rollers 12, in particular ones which are arranged spatially separate from each other, in thedevice 1. - The
recording medium 2 is thereafter conveyed in its direction ofmovement 9 in the direction of a point ofintersection 6 and furthermore into theoutput path 4. In this advantageous development of the invention the point ofintersection 6 is the region at whichprinting path 3,output path 4 andduplex path 5 meet and/or cross in certain sections. In theoutput path 4 in the direction of an output opening (not shown) therecording medium 2 is conveyed by means of the output rollers 32 of the output device 41. As soon as a trailing edge of therecording medium 2 has passed the point ofintersection 6 the direction ofmovement 9 of therecording medium 2 is reversed, whereby therecording medium 2 is guided in the direction of theduplex path 5. Therecording medium 2 is conveyed in theoutput path 4 in the direction of theduplex path 5 by means of duplex rollers 42 of a reversing device 51. Output rollers 32 and duplex rollers 42 can be constructed particularly advantageously as universal rollers 52. The direction ofmovement 9 of therecording medium 2 also is being reversed when the direction of rotation of the universal rollers 52 is reversed. This allows reliable and exact conveying, in particular guidance, of therecording medium 2 and only a small number of moving parts in or on thedevice 1, whereby production and maintenance are inexpensive. - The point of
intersection 6 is advantageously formed in such a way that a recording means 2 conveyed in the direction of theprinting unit 13, in particular in the direction of theduplex path 5, is reliably guided in theduplex path 5, it being possible to advantageously construct the component forming the point ofintersection 6 in one piece, whereby the device, in particular the printer, is compact and inexpensive and an existing model of a device for one-sided printing can be expanded by theduplex path 5 using simple and inexpensive measures. - In the
duplex path 33 therecording medium 2 is conveyed by means of thedrive rollers 33 further in the direction of the receivingrollers 12, it being possible to convey therecording medium 2 adjacent to or in thestorage container 11 at least in certain sections. Alternatively theduplex path 5 can be constructed in thedevice 1, in particular outside the region of the at least onestorage container 11. - Renewed take-up of the
recording medium 2 is subsequently carried out by means of a predetermined control signal by the receivingrollers 12 or an alternative receiving mechanism. Therecording medium 2 is again conveyed into theprinting path 3, the second side of therecording medium 2 being printed. Immediately thereafter therecording medium 2 is again conveyed into theoutput path 4, therecording medium 2 being conveyed in theprinting path 3 by means of theprinting path rollers 15 and thecontrol rollers 31 and therecording medium 2 again being guided through the point ofintersection 6. - The
recording medium 2 is conveyed in theoutput path 4 by means of the output rollers 32. Since therecording medium 2 has already been printed on both sides at this point in time it is ejected through the output opening (not shown) and conveyed into an output tray (not shown), wherein therecording medium 2 in the output tray is ready for removal. -
Figures 2 to 8 schematically show in profile thedevice 1 according toFig. 1 and a plurality ofrecording media 2, which are different from each other and are moved at the same time, during different steps, the progression of the method being shown continuously. The plurality ofrecording media 2 is shown in dot-dash lines.Different recording media 2 with the same area/size and thickness and different area/size and/or thickness can be printed simultaneously, in particular in one print job.Figures 2 to 8 illustrate different steps of the method thereto, the choice of steps, in particular the number of chosen steps, being used merely for the purpose of illustration; a different division of method steps, i.e. division into individual steps, may also be chosen. -
Fig. 2 schematically shows in profile thedevice 1 ofFig. 1 and threerecording media 2 which are different form each other: a zeroth recording medium 21, a first recording medium 22 and asecond recording medium 23, during a first step. The zeroth recording medium 21 is situated in this case, i.e. during this step, in theprinting path 3 and is printed on the second side in the process. The first recording medium 22 and thesecond recording medium 23 are situated in thestorage container 11 and are not involved in the procedure during the first step. -
Fig. 3 schematically shows in profile thedevice 1 ofFig. 1 and the zeroth recording medium 21, the first recording medium 22 and thesecond recording medium 23 during a second step which immediately follows the first step. In this case, i.e. during the second step, the zeroth recording medium 21 is situated in theoutput path 4 and as it has already been printed on both sides, is output through the output opening. The first recording medium 22 is printed on the first side, i.e. is printed on one side during this step. Thesecond recording medium 23 is situated in the storage container and is not involved in the procedure during the second step. The zeroth recording medium 21 and the first recording medium 22 are successively arranged in the path of movement so as to be spaced apart with a only a slight spacing, in particular less than the length of the zeroth recording medium 21. -
Fig. 4 schematically shows in profile the device ofFig. 1 and the zeroth recording medium 21, the first recording medium 22 and thesecond recording medium 23 during a third step which follows the second step. The zeroth recording medium 21 is already situated fully in an output tray (not shown). The first recording medium 22 is situated in theoutput path 4 just before, after or at the time the direction of rotation of the output rollers 32 is reversed. After reversing the direction of rotation of the output rollers 32 and the corresponding reversal of the direction ofmovement 9 of the first recording medium 22 the first recording medium 22 is moved in the direction of theduplex path 5. In this case, i.e. during the third step, thesecond recording medium 23 is in contact with the receivingroller 12, a predeterminable control signal controlling the intake and guidance of thesecond recording medium 23 in theprinting path 3 and a pause, in particular a printing pause, being formed between printing of the first recording medium 22 and thesecond recording medium 23. The first recording medium 22 and thesecond recording medium 23 are successively arranged in the path of movement so as to be spaced apart by more than the length of the first recording medium 22. -
Fig. 5 schematically shows in profile the device ofFig. 1 and the zeroth recording medium 21, the first recording medium 22 and thesecond recording medium 23 during a fourth step which follows the third step. The zeroth recording medium 21 is situated fully in the output tray. The first recording medium 22 is situated in theduplex path 5 during this step. Thesecond recording medium 23 is situated in theprinting path 3 and is printed on the first side. -
Fig. 6 schematically shows in profile the device ofFig. 1 and the zeroth recording medium 21, the first recording medium 22 and thesecond recording medium 23 during a fifth step which follows the fourth step. The zeroth recording medium 21 is situated fully in the output tray. The first recording medium 22 is still in theduplex path 5, the conveying speed of thesecond recording medium 23 being reduced and/or conveying being paused for a predetermined unit of time and a pause, in particular a printing pause, is thus formed. Thesecond recording medium 23 is situated in theoutput path 4 just before, after or at the time the direction of rotation of the output rollers 32 is reversed from the direction of rotation for moving thesecond recording medium 23 in the direction of the ejection opening to the direction of rotation for moving thesecond recording medium 23 in the direction of theduplex path 5. By reversing the direction of rotation of the output rollers 32 the corresponding direction ofmovement 9 of thesecond recording medium 23 is reversed. In the process thesecond recording medium 23 and the first recording medium 22 can approach each other in the path of movement. In particular at the end of this step the first recording medium 22 and thesecond recording medium 23 are successively arranged in the path of movement, in particular both are in theduplex path 5 at least in certain sections, so as to be successively spaced apart at a slight spacing, in particular less than the length of the second recording medium. -
Fig. 7 schematically shows in profile the device ofFig. 1 and the zeroth recording medium 21, the first recording medium 22 and thesecond recording medium 23 during a sixth step which follows the fifth step. The zeroth recording medium 21 is brought fully into the output tray. The first recording medium 22 is situated in theprinting path 3 and is printed for a second time and on the second side. After printing the second side of the first recording medium 22 the first recording medium 22 is conveyed in the direction of the point ofintersection 6. Thesecond recording medium 23 is situated in theduplex path 5 and is already in contact with the receiving roller, the first recording medium 22 and thesecond recording medium 23 being successively arranged in the path of movement so as to be spaced apart at a slight spacing, in particular less than the length of the first recording medium 22. -
Fig. 8 schematically shows in profile thedevice 1 ofFig. 1 and the zeroth recording medium 21, the first recording medium 22 and thesecond recording medium 23 during a seventh step which follows the sixth step. The zeroth recording medium 21 is brought fully into the output tray. The second recording medium 22 is situated in theoutput path 4 and - since it is printed on both sides - is output through the output opening into the output tray. Thesecond recording medium 23 is situated in theprinting path 3 and is printed on the second side during the seventh step. The first recording medium 22 and thesecond recording medium 23 are successively arranged in the path of movement so as to be spaced apart at a slight spacing, in particular less than the length of the first recording medium 22. - In a further step (not shown) subsequent to printing of the second side of the
second recording medium 23, whereby thesecond recording medium 23 is printed completely and on two sides, thesecond recording medium 23 is conveyed in the direction of the point ofintersection 6, further in the direction of theoutput path 4 and through the output opening into the output tray, the direction of rotation of the output rollers 32 and the direction ofmovement 9 of thesecond recording medium 23 in theoutput path 4 not being reversed accordingly. - The above-described method is not restricted to just three
recording media 2, rather it may be understood as a continuous method, wherein between printing of the first side of one of therecording media 2 and the second side of thesame recording medium 2 at least one side of afurther recording medium 2 is printed on a recurring basis. - The
drive roller 33 is advantageously constructed with a freewheel. As soon as therecording medium 2 is moved more quickly in the path of movement than it would be moved by thedrive roller 33, in particular as a result some other force effect, thedrive roller 33 freewheels. As a result therecording medium 2 can simultaneously be conveyed by thedrive roller 33 and the receivingroller 12 or a further receiving roller constructed in addition to the receivingroller 12. The freewheel thus ensures that even with a different drive speed of receivingroller 12 and driveroller 33, therecording medium 2 is conveyed over the entire surface of therecording medium 2 at a constant speed and thus no stresses or deformations occur in therecording medium 2 along the surface, in particular along the length in the direction ofmovement 9. - Conveying of the
recording medium 2 in theduplex path 5 is thus particularly gentle, it being possible to reliably convey evensensitive recording media 2. - Different sizes, thicknesses and/or material types of
recording media 2 can be particularly advantageously conveyed in theduplex path 5 which in particular comprises thedrive roller 33 with the freewheel. Recordingmedia 2 which differ from each other in particular in terms of area can be printed during one of the print jobs or in successive print jobs. High flexibility of thedevice 1 when choosing therecording media 2 is thus ensured, it being possible to print especiallydifferent recording media 2 with area ratios to each other of 1 to 4, in particular of 1 to 3, and/or length ratios of 1 to 2, in particular 1 to 1.5 in one print job and/or in successive print jobs. - The
recording media 2 of different size, in particular area, can in the process be arranged indifferent storage containers 11, wherein in particular one of the sizes is arranged in one of thestorage containers 11 respectively. - The spacing in the path of movement of two recording media 2 - a first recording medium 22 and a second recording medium 23 - which, in particular, can be constructed with different lengths in the direction of
movement 9, can advantageously be guided by the length of the first of the two recording media, i.e. the first recording medium 22. It may particularly advantageously be provided in this connection that immediately after first printing of the first recording medium 22, i.e. on the first side of the first recording medium 22, the spacing between the first recording medium 22 and thesecond recording medium 23 in the path of movement is greater than the length of the first recording medium 22 in the direction ofmovement 9, and that immediately after second printing of the first recording medium 22, i.e. on the second side of the first recording medium 22, the spacing between the first recording medium 22 and thesecond recording medium 23 in the path of movement is less than the length of the first recording medium 22 in the direction ofmovement 9. Theprinting unit 13 is thus used particularly efficiently time-wise, the first recording medium 22 being given sufficient time to be conveyed fully into theoutput path 4 and from there back into theduplex path 5 without there being a risk of the first recording medium 22 and thesecond recording medium 23 coming into contact with other at the point of intersection or being conveyed into each other during double-sided printing. A low error rate and high reliability and print speed are thus ensured. - If the speed of movement of the
recording medium 2 in the individual sections of the path of movement, i.e. in theprinting path 3, theoutput path 4 and theduplex path 5, is different, in particular are in predetermined ratios to each other, these ratios can advantageously be considered when determining the spacing of therecording media 2 from each other in the path of movement. In particular the method of double-sided printing can be accelerated by the partially quicker conveying of therecording medium 2, i.e. the movement which is faster in parts than in adjoining regions of the path, in particular of the printing path, , and printing-free time units, i.e. the time units without printing activity of theprinting unit 13, are reduced. High utilisation and high time efficiency of thedevice 1 can thus be ensured. - The
storage container 11 can advantageously be constructed so as to be changeable in size to receiverecording media 2 of different sizes. A plurality ofstorage containers 11 that are changeable in size and/orstorage containers 11 of different size can likewise be constructed in or on thedevice 1. Therecording media 2 can equally be supplied by means of one or more manual feed tray(s). - With a print job comprising a plurality of pages of a document for printing, the print job - at least print job internally and/or device-internally - beginning with page number one and with a constantly increasing page number extending to a predetermined page number, the printing sequence of the page numbers can advantageously be resorted, so the
recording media 2 of a print job, printed on both sides, are output into the output tray with constantly increasing, sorting page numbers. - With double-sided printing of at least one of the
recording media 2 it can particularly advantageously be provided that the higher of the two page numbers to be printed on arecording medium 2 is printed on the first side of therecording medium 2, i.e. before turning therecording medium 2 over, wherein it is in particular provided that the sequence of page numbers to be printed is basically increasing, i.e. eachrecording medium 2 following one of therecording media 2 is printed with higher page numbers than therecording medium 2. It may thus be ensured that with double-sided printing ofrecording media 2 the document, after being output into the output tray, is output with constantly increasing page numbers and in the correct sort order. - For the case where a reversed print sequence is chosen, with the print job - at least print job-internally and/or device-internally - beginning with a predetermined highest page number and with a constantly decreasing page number extending to page number one, it may advantageously be provided that the lower of the two page numbers to be printed on a
recording medium 2 is printed on the first side of therecording medium 2, i.e. before therecording medium 2 is turned over, wherein it is in particular provided that the sequence of page numbers to be printed is basically decreasing, i.e. eachrecording medium 2 following one of therecording media 2 being printed with lower page numbers than therecording medium 2. It may thus be ensured for the reversed print sequence as well that with double-sided printing ofrecording media 2, the document, after being output into the output tray, is output with constantly increasing page numbers and in the correct sort order. - When printing in the reversed print sequence and if the print job comprises an uneven number of page numbers it can advantageously be provided that, after printing the first side, the
recording medium 2 printed first is guided in theduplex path 5 and again in theprinting path 3 and in the process is turned over, therecording medium 2 being guided through theprinting path 3 print-free, onwards into theoutput path 4 and is output. It can thus be ensured that even when printing in the reversed print sequence and for an uneven number of page numbers that with double-sided printing ofrecording media 2 the document is output in the correct sort order. - A print image is produced on the page when printing a page of a
recording medium 2. To compensate for the rotation of therecording medium 2 when the page is turned over, the print image of the second side of therecording medium 2 is advantageously rotated by 180° in comparison with the print image of the first side of thesame recording medium 2. It can thus be ensured that after therecording medium 2 printed on both sides has been output, top and bottom on the first page and on the second page are arranged in the same region of therecording medium 2 and thus therecording medium 2 has only to be turned as usual for regarding, especially for reading, the first page and the second page. - Further embodiments according to the invention merely comprise some of the described features, it being possible to provide each combination of features, in particular also of different, described embodiments.
Claims (10)
- Method for double-sided printing of recording media (2), preferably sheets, comprising a printing unit (13) for one-sided printing, a recording medium (2), after printing of a first side, again being fed via a duplex path (5) to the printing unit (13) for printing of a second side, and the recording media (2), before printing of the first side, being received by means of a receiving roller (12) from a storage container (11), characterised in that between printing the first side of one of the recording media (2) and the second side of the same recording medium (2) at least one side of a further recording medium (2) is printed.
- Method according to claim 1, characterised in that after printing the first side of a first recording medium (2, 22) and printing the second side of the same recording medium (2, 22) exactly one side of the preceding or following recording medium (2) is printed.
- Method according to claim 1 or 2, characterised in that a respective group of two recording media (2) is printed on both sides, first of all the first side of the first recording medium (2, 22) of the group being printed, after a first printing pause the first side of the second recording medium (2, 23) of the group being printed, subsequently after a second printing pause the second side of the first recording medium (2, 22) being printed and finally the second side of the second recording medium (2, 23) being printed.
- Method according to claim 3, characterised in that during the first printing pause and/or printing of the first side of the second recording medium (2, 23) the first recording medium (2, 22) is conveyed via the duplex path (5), and in that during the second printing pause and/or printing of the second side of the first recording medium (2, 22) the second recording medium (2, 23) is conveyed via the duplex path (5).
- Method according to any one of claims 1 to 4, characterised in that at least a leading edge - viewed in the direction of movement (9) of the recording medium (2) - of the recording medium (2) in the duplex path (5) is arranged in the storage container (11) between the receiving roller and the recording media (2).
- Method according to claim 5, characterised in that the recording medium (2) in the duplex path (5) is conveyed at least in certain sections by means of a drive roller (33) constructed with a freewheel and connected upstream of the receiving roller (12).
- Method according to claim 5 or 6, characterised in that the leading edge - viewed in the direction of movement (9) of the recording medium (2) - of the recording medium (2) in the duplex path (5) is arranged in the storage container (11).
- Method according to any one of claims 1 to 7, characterised in that the drive roller (33) is arranged above the storage container (11).
- Device for double-sided printing of recording media (2), preferably sheets, comprising a printing unit (13) for one-sided printing, at least one duplex path (5) being provided for bringing the recording medium (2) from at least one reversing device (51) to the printing unit (13) for printing the second side, and a receiving roller (12) for receiving the recording medium (2) from a storage container (11) being provided, characterised in that the receiving roller (12) is arranged along the duplex path (5), and in that the drive roller (33) connected upstream of the receiving roller (12) in the duplex path (5) comprises a freewheel.
- Device according to claim 9, characterised in that the spacing between the drive roller (33) and the receiving roller (12) is less than the length - viewed in the direction of movement (9) of the recording medium (2) - of the receiving region of the storage container (11).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20070290932 EP2018972B1 (en) | 2007-07-24 | 2007-07-24 | Method and device for double-sided printing |
ES07290932T ES2387411T3 (en) | 2007-07-24 | 2007-07-24 | Method and device for printing on both sides |
HK09106894.5A HK1128658A1 (en) | 2007-07-24 | 2009-07-27 | Method and device for double-sided printing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20070290932 EP2018972B1 (en) | 2007-07-24 | 2007-07-24 | Method and device for double-sided printing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2018972A1 true EP2018972A1 (en) | 2009-01-28 |
EP2018972B1 EP2018972B1 (en) | 2012-05-02 |
Family
ID=38952060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20070290932 Expired - Fee Related EP2018972B1 (en) | 2007-07-24 | 2007-07-24 | Method and device for double-sided printing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2018972B1 (en) |
ES (1) | ES2387411T3 (en) |
HK (1) | HK1128658A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0840181A2 (en) * | 1996-10-08 | 1998-05-06 | Océ-Technologies B.V. | Method of scheduling a sequence of pages to be printed with a duplex printer |
US6168327B1 (en) * | 1997-12-10 | 2001-01-02 | Brother Kogyo Kabushiki Kaisha | Image forming device |
-
2007
- 2007-07-24 EP EP20070290932 patent/EP2018972B1/en not_active Expired - Fee Related
- 2007-07-24 ES ES07290932T patent/ES2387411T3/en active Active
-
2009
- 2009-07-27 HK HK09106894.5A patent/HK1128658A1/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0840181A2 (en) * | 1996-10-08 | 1998-05-06 | Océ-Technologies B.V. | Method of scheduling a sequence of pages to be printed with a duplex printer |
US6168327B1 (en) * | 1997-12-10 | 2001-01-02 | Brother Kogyo Kabushiki Kaisha | Image forming device |
Also Published As
Publication number | Publication date |
---|---|
EP2018972B1 (en) | 2012-05-02 |
HK1128658A1 (en) | 2009-11-06 |
ES2387411T3 (en) | 2012-09-21 |
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