EP1733894A1 - Drucker - Google Patents

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Publication number
EP1733894A1
EP1733894A1 EP05105364A EP05105364A EP1733894A1 EP 1733894 A1 EP1733894 A1 EP 1733894A1 EP 05105364 A EP05105364 A EP 05105364A EP 05105364 A EP05105364 A EP 05105364A EP 1733894 A1 EP1733894 A1 EP 1733894A1
Authority
EP
European Patent Office
Prior art keywords
media
axis
supporting axis
printing apparatus
media supporting
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.)
Withdrawn
Application number
EP05105364A
Other languages
English (en)
French (fr)
Inventor
Francisco-Javier Pozuelo
Antonio Fonseca
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hewlett Packard Development Co LP
Original Assignee
Hewlett Packard Development Co LP
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hewlett Packard Development Co LP filed Critical Hewlett Packard Development Co LP
Priority to EP05105364A priority Critical patent/EP1733894A1/de
Publication of EP1733894A1 publication Critical patent/EP1733894A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16—Means for tensioning or winding the web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/50—Machine elements
    • B65H2402/54—Springs, e.g. helical or leaf springs

Definitions

  • the present invention relates to a printing apparatus comprising a media supporting axis for a roll of printing media.
  • a printing media travels in an advance direction under a printhead, which deposits ink on the media.
  • the media advance may be stepwise, the pri nt head ej ecti ng drops of ink on the underlying media while the latter remains stationary.
  • the printing media may be a web, which is fed from a feed roll arranged in the printing apparatus upstream of the printhead and on which several different plots are printed one after the ot her.
  • This operation may be convenient for avoiding a waste of media when a length of blank media has been outputted from the printer in the advance direction; this may happen, for example, when a further operation is performed on the media downstream of the printing device, such as described in US-2004036755-A , which is owned by the present applicant and relates to a printing apparatus comprising a laminator to which the media outputted by the printer isfed in an integrated operation.
  • the blank media previously outputted may be pulled back into the printer, in order to avoid a waste of media.
  • the media driving means are reversed and the media is caused to travel backwards into the printer.
  • the media may remain loose in the region upstream of the driving means; or the media may be damaged due to unexpected contact with a surface of the printing apparatus itself or of other external elements. Such a contact and damage may cause a significant loss in production due to the need of lengthy user intervention; and of course a lot of media might then be wasted.
  • printers in particular some large format printers, are designed to control the accurate positioning of the media during printing and advance by means of back tension, i.e. applying a force in a direction opposite to the advance direction to keep the media slightly tensioned upstream of the printhead. This is done for example using a passive friction brake on the media feed roll.
  • the present invention seeks to provide a printing apparatus i n which a waste of media can be avoided in certain circumstances, for example when an operation to be performed downstream of the printing apparatus requires advancing blank media through the printer, and in which at the same time the drawbacks mentioned above are at least reduced.
  • the present invention relates to a printing apparatus comprising a media supporting axis for a roll of printing media, wherein said media supporting axis can rotate in a first direction to allow feeding said printing media past a printhead in an advance direction during a printing operation, and wherein said apparatus comprises means for causing rotation of said media supporting axis in a second direction opposite to said first direction.
  • Said means for causing rotation of the media supporting axis in said second direction may comprise driving means, which may be passive driving means; the provision of passive driving means allows proving a cost-effective and relatively simple devi ce.
  • the expression "passive" driving means is applied to a device that can provide a driving force without simultaneously consuming power from the mains; this may be achieved generally by powering the device, i.e. loading it with energy, during another stage of the operation of the apparatus, e.g. upon rotation or displacement of another element.
  • the present invention relates to a media delivery assembly for feeding printing media to a printing apparatus, comprising a media supporting axis for a roll of printing media, wherein said media supporting axis can rotate in a first direction to allow feeding said printing media in an advance direction, and wherein said spindle further comprises means for causing rotation of said media supporting axis in a second direction opposite to said first direction.
  • a media Mto be printed travels under a print head 1 in an advance direction shown by arrow A, driven by a media advance system 2.
  • the printing media M is here a web of media, which is fed from a media feed roll 3; between the feed roll and the advance system 2 the media travels around an idle roller 4.
  • the media feed roll 3 is supported by a media delivery assembly 50 according to an embodiment of the present invention, such as a spindle, which is shown in more detail in figure 2.
  • the spindle 50 comprises a media supporting axis 60, on which the feed roll 3 is mounted, an inner axis 70 coaxial to the media supporting axis 60, and a torsion spring 80 arranged between the two axes, i.e. with one end attached to the inner axis 70 and the other end attached to the media supporting axis 60.
  • the inner axis 70 is mounted at each end in the printing apparatus by means of a friction sleeve 71, which is integral in rotation with said axis and is arranged in a suitable housing or support (not shown) foreseen in the structure of the printing apparatus, such that the cooperation of the housing and the friction sleeve 70 performs a braking action opposing the rotation of the inner axis 70.
  • the friction sleeves 71 constitute passive braking means.
  • the media supporting axis 60 is mounted around the inner axis 70 by means of roller bearings 90; the media feed roll 3 is supported on axis 60 so as to be integral in rotation therewith.
  • the torsion spring 80 is coiled around the inner axis 70, and it has one end attached to the media supporting axis 60, e.g. to one of the side flanges 61 as shown in figure 2, and the other end attached to a sleeve 72 which is rigidly attached to the inner axis 70.
  • the spring 80 has the function of storing energy during normal printing operation, when the media travels in the advance direction and the media supporting axis 60 rotates accordingly, in the direction shown by arrowsAin figure 1.
  • the printer driving system 2 When some of the media is pulled back into the printer by the printer driving system 2, in the direction of arrows B in figure 1, the pulling force of the media on the spindle ceases, and the spri ng 80 provides the stored energy for causing rotation of the media supporting axis 60 in a direction opposite the media advance direction, as shown by arrow B, such that the media is recoiled on the feed roll 3.
  • the inner axis 70 remains stationary.
  • the spring 80 constitutes a passive driving means for the media supporting axis 60: it is not powered or driven by a motor, but it stores energy for rotating the axis 60 in a direction opposite to the advance direction, when required.
  • the spring 80 is designed and arranged such that the maximum force it can exert is smaller than the friction force between the inner axis 70 and the printer, i.e. between the friction sleeves 71 and the printer housing. Thus, the inner axis 70 will not rotate with respect to the printer housing unless the spring 80 is fully loaded.
  • the spring 80 is coiled around the inner axis 70 and housed i n its entirety inside the axis 60, t hereby avoiding the risk t hat a person may unintentionally touch the spring; this reduces the risk of injures to users and damages to the apparatus.
  • Figure 3 shows a graph of the force of the spring 80 as a function of time.
  • F represents the force of the spring in each instant, F b being the maximum force the spring can exert, when it is fully st ret ched.
  • Figures 4a to 4c show schematically the spindle 50 in side view during some steps of the operation: more particularly, figure 4a shows the spindle at an instant between to and t 1 ; figure 4b shows the spindle at an instant between t 1 and t 2 ; and figure 4c shows the spindle at an instant between t 2 and t 3 .
  • the spring 80 is not under tension; the media supporting axis 60 of the spindle 50 is drawn in motion by the media itself and starts rotating wit h respect to the inner axis 70, as shown in figure 4a; the inner axis 70 at this stage is kept stationary by the friction between the friction sleeves 71 and the printer housi ng.
  • the spring 80 elongates and its force gradually increases, as shown by the slope in the graph between to and t 1 , such that the spring stores potential energy.
  • the back tension to which the media issubject also increases.
  • the spring reaches its fully stretched state and its maximum force F b , and the inner axis 70 of the spindle starts rotating together with the media support i ng axis 60, because it is drawn by the spri ng 80.
  • the media advance is stopped, and at instant t 2 and the advance system 2 is inverted to pull media back towards the printer, then the media will cease to exert a pulling force on the media supporting axis 60, which will then start to rotate in the direction of arrow B, opposite to the advance direction, drawn by the force of the spring 80.
  • the media pulled back towards the pri nt er by the advance syst em 2 will recoil on the media supporting axis, as shown in figure 4c.
  • the force of the spring 80 will gradually decrease as it delivers the stored energy to recoil the media, as shown by the slope of the graph of figure 3 between t 2 and t 3 .
  • the length of media that can be recoiled on the spindle 50 depends on the design of the spindle, and especially on the features of the spring 80; the skilled man is able to provide in each particular case a design suited to the desired length of media to be recoiled.
  • the spindle has been described with a torsion spring 80 between the media supporting axis 60 and the inner axis 70, but different configurations are also possible:
  • the passive means for driving a media supporting axis in a direction opposite to the media advance direction may also be embodied by devices other than resilient elements but that are suitable for storing energy during the advance of the media and delivering said energy when the media is pulled back towards the printer, such as mechanic or pneumatic systems.
  • the spindle 50 may also be provided with a preload disk 73.
  • This is a disk that is keyed to the inner axis 70 at one end of the spindle 50, such that a user can manually rotate the inner axis 70 while maintaining stationary the media supporting axis 60, in order to load the spri ng 80 with a desired degree of force.
  • This pre-loading operation may be carried out when loading a roll of media on the spindle; thus, the media may be subject to an appropriate back tension right from the beginning of the printing operation on a new roll of media. As mentioned before, such back tension is useful for improving the media advance and controlling its lateral travelling.
  • the preload disk is provided with grip tabs 74 near its peri phery.
  • the spindle 50 has been described associated to a printer.
  • a spindle according to an embodiment of the invention could also be provided as a separate part to be used in existing printer; for example, the design of the spindle that has been described by way of example, having a spring arranged between the two axes, is compatible with several existing inkjet printers. The incorporation of such a spindle in other kinds of printing apparatus is also possible.
  • the spindle may be provided with a suitable support or housing, and be used as an independent accessory for feeding printing media to a printing apparat us.
  • a media delivery assembly such as claimed in the present application could of course be structurally different from the spindle described herein by way of example.

Landscapes

  • Unwinding Webs (AREA)
EP05105364A 2005-06-17 2005-06-17 Drucker Withdrawn EP1733894A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05105364A EP1733894A1 (de) 2005-06-17 2005-06-17 Drucker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05105364A EP1733894A1 (de) 2005-06-17 2005-06-17 Drucker

Publications (1)

Publication Number Publication Date
EP1733894A1 true EP1733894A1 (de) 2006-12-20

Family

ID=35385156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05105364A Withdrawn EP1733894A1 (de) 2005-06-17 2005-06-17 Drucker

Country Status (1)

Country Link
EP (1) EP1733894A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015537A1 (en) * 2010-07-29 2012-02-02 Brady Worldwide, Inc. Friction core brake
ITFI20110182A1 (it) * 2011-08-16 2013-02-17 Co Me Sa S R L Dispositivo per il tensionamento di nastri di materiale plastico per l'alimentazione di macchine per la produzione di imballaggi protettivi a cuscini di aria.
CN108053548A (zh) * 2018-01-24 2018-05-18 深圳怡化电脑股份有限公司 一种暂存装置及金融自助终端

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6018373A (ja) * 1983-07-11 1985-01-30 Fuji Xerox Co Ltd インクドナ−フイルム装置
US4570870A (en) * 1983-10-25 1986-02-18 Kabushiki Kaisha Sato Web feed mechanism for feeding a web from a roll
JPS61125875A (ja) * 1984-11-26 1986-06-13 Matsushita Electric Ind Co Ltd 熱転写プリンタのインクリボン供給装置
EP0780725A1 (de) * 1995-12-19 1997-06-25 Noritsu Koki Co., Ltd. Papiermagazin mit einem Papier-Rückwickelmechanismus
WO2000047508A1 (en) * 1999-02-11 2000-08-17 Expand International Ab Device and method for preloading a spring and a reeling device including said device
US20040036755A1 (en) 2002-05-17 2004-02-26 Hewlett-Packard Development Company, L.P. Printing apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6018373A (ja) * 1983-07-11 1985-01-30 Fuji Xerox Co Ltd インクドナ−フイルム装置
US4570870A (en) * 1983-10-25 1986-02-18 Kabushiki Kaisha Sato Web feed mechanism for feeding a web from a roll
JPS61125875A (ja) * 1984-11-26 1986-06-13 Matsushita Electric Ind Co Ltd 熱転写プリンタのインクリボン供給装置
EP0780725A1 (de) * 1995-12-19 1997-06-25 Noritsu Koki Co., Ltd. Papiermagazin mit einem Papier-Rückwickelmechanismus
WO2000047508A1 (en) * 1999-02-11 2000-08-17 Expand International Ab Device and method for preloading a spring and a reeling device including said device
US20040036755A1 (en) 2002-05-17 2004-02-26 Hewlett-Packard Development Company, L.P. Printing apparatus and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 139 (M - 387) 14 June 1985 (1985-06-14) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 315 (M - 529) 25 October 1986 (1986-10-25) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012015537A1 (en) * 2010-07-29 2012-02-02 Brady Worldwide, Inc. Friction core brake
CN103118875A (zh) * 2010-07-29 2013-05-22 勃来迪环球股份有限公司 摩擦芯部制动件
US8714471B2 (en) 2010-07-29 2014-05-06 Brady Worldwide, Inc. Friction core brake
ITFI20110182A1 (it) * 2011-08-16 2013-02-17 Co Me Sa S R L Dispositivo per il tensionamento di nastri di materiale plastico per l'alimentazione di macchine per la produzione di imballaggi protettivi a cuscini di aria.
CN108053548A (zh) * 2018-01-24 2018-05-18 深圳怡化电脑股份有限公司 一种暂存装置及金融自助终端
CN108053548B (zh) * 2018-01-24 2024-04-05 深圳怡化电脑股份有限公司 一种暂存装置及金融自助终端

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