EP0855284A1 - Thermodrücker mit blattzuführmitteln - Google Patents

Thermodrücker mit blattzuführmitteln Download PDF

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Publication number
EP0855284A1
EP0855284A1 EP97203596A EP97203596A EP0855284A1 EP 0855284 A1 EP0855284 A1 EP 0855284A1 EP 97203596 A EP97203596 A EP 97203596A EP 97203596 A EP97203596 A EP 97203596A EP 0855284 A1 EP0855284 A1 EP 0855284A1
Authority
EP
European Patent Office
Prior art keywords
sheet
thermal printer
thermal
printer according
drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97203596A
Other languages
English (en)
French (fr)
Other versions
EP0855284B1 (de
Inventor
Paul Leys
Daniel Verbeek
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.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
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 Agfa Gevaert NV filed Critical Agfa Gevaert NV
Priority to EP19970203596 priority Critical patent/EP0855284B1/de
Publication of EP0855284A1 publication Critical patent/EP0855284A1/de
Application granted granted Critical
Publication of EP0855284B1 publication Critical patent/EP0855284B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
    • B65H9/103—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting by friction or suction on the article for pushing or pulling it into registered position, e.g. against a stop
    • B65H9/106—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting by friction or suction on the article for pushing or pulling it into registered position, e.g. against a stop using rotary driven elements as part acting on the article

Definitions

  • the present invention relates to a thermal printer with a thermal head for line-wise heating a heat-sensitive sheet to produce an image, in particular an image on a transparent support, for medical diagnostic purposes.
  • Thermal imaging or thermography is a recording process wherein images are generated by the use of image-wise modulated thermal energy.
  • thermography two approaches are known :
  • Common thermal printers comprise a rotatable drum and an elongate thermal head which is spring-biased towards the drum to firmly line-wise contact a heat-sensitive material which is passed between the head and the drum.
  • the thermal head includes a plurality of heating elements and corresponding drivers and shift registers for these elements.
  • the image-wise heating of a sheet is performed on a line by line basis, with the heating resistors geometrically juxtaposed along each other in a bead-like row running parallel to the axis of the drum.
  • Each of these resistors is capable of being energised by heating pulses, the energy of which is controlled in accordance with the required density of the corresponding picture element.
  • the test print is produced by first measuring the electrical resistance of each heating element of the printhead and then driving the elements so that the same electrical power as a time average is converted in each of the heating elements.
  • the sheet i.e. the image receiving sheet
  • a dye donor sheet or web is conveyed by frictional contact with the rotating sheet past the thermal head.
  • a single heat-sensitive sheet is conveyed between the thermal head and the drum, and the image is directly produced in the sheet.
  • the sheet is not attached to the drum but is advanced between the head and the drum by frictional contact of its rear side with the drum.
  • the present invention is concerned with such direct thermal image formation.
  • a difficulty with direct thermal image formation is the exact location of the heat-sensitive sheet between the print drum and the thermal head, prior to printing.
  • the image receiving sheet is clamped on the print drum and, prior to printing, the thermal head is lifted from the drum to allow the clamp to pass under the head and the print drum to take the correct angular position in which the leading sheet end extends just beyond the thermal head.
  • careful control of the angular position of the drum automatically entails the correct start position of the leading sheet end.
  • the leading sheet end is freely passed between head and drum before the head becomes urged towards the drum to start printing.
  • the correct position of the leading sheet end preparatory to printing is very important since once the head is closed, the sheet position with respect to the drum can no longer be altered.
  • the size of the, unprinted, leading end of the sheet is important in printing positive-type conventional images, it is even more important in printing negative-type images on a transparent support, such as images on a transparent support for medical diagnostic purposes. Examples of medical diagnosis are echograms, CT scans and NMR images which all are negative-type images, what means that the overall background is substantially black, the image details having lesser optical densities.
  • the support of the image-receiving sheet in such application is polyethylene terephthalate or a similar material, the edges of which are often sharp and destructive for any surface in sliding contact therewith.
  • the width of the sheet to be printed may be smaller than the length of the thermal head but the lateral sheet margins are not printed, and the head is put in contact with the sheet only after the front edge thereof has passed, and removed before the trailing edge of the sheet arrives. Further, the sheet is duly laterally aligned before the thermal head takes its printing position.
  • the result of all this is an unprinted, transparent marginal frame surrounding the image on the sheet which as such is not disturbing because its width is of the order of magnitude of 5 mm only.
  • this margin be of uniform width and thus it is clear that the printing apparatus should provide a very accurate control of the longitudinal and lateral sheet position prior to printing.
  • a thermal printer with a thermal head for image-wise heating a heat-sensitive sheet according to an elongate printing zone, transverse with respect to the sheet, and a rotatable, driven print drum for conveying such sheet past such thermal head while the head is urged towards the drum, said thermal head having a rest position remote of the print drum allowing the leading end of a sheet to pass freely through the gap between such head and drum, and an operative one in which it urges the sheet onto such drum for printing, is characterised in that it comprises sheet feeding means having a sheet-forwarding mode for moving a sheet with its leading end through said gap beyond the position it should take at the start of printing, and a sheet-returning mode in which the sheet moves backwardly for contacting with its trailing edge stop means for its longitudinal alignment, thereby to obtain with its leading end the correct printing start position in said gap.
  • the print drum and the thermal head of a printer in accordance with the invention are suitably disposed in such a way that a sheet can be freely passed through the gap between them according to an upwardly directed course.
  • This has the advantage that a sheet can be passed through said gap to a position beyond its intended one, and then be allowed to move back merely under the influence of gravity until its trailing edge engages the mentioned stop.
  • Suchlike arrangement is simple and reliable in operation.
  • the sheet feeding means may also be arranged to supplement the effect of gravity by driving the sheet backwardly.
  • Suitable embodiments of a thermal printer according to the invention are as follows.
  • the printer comprises means for adjusting the lateral position of the sheet after or before its longitudinal adjustment by said stop means.
  • the printer comprises a holder for holding a stack of sheets to be fed in a position tilted to the vertical, dispenser means for dispensing each time the upper sheet from a stack of sheets held in such position, and for feeding such sheet with its leading end through the gap between print drum and opened thermal head.
  • dispenser means for dispensing each time the upper sheet from a stack of sheets held in such position, and for feeding such sheet with its leading end through the gap between print drum and opened thermal head.
  • the sheet stop can be arranged for being mounted at different heights on said holder depending on a particular sheet size.
  • a thermal printer according to the present invention is particularly suited for being used in conjunction with the improvement disclosed in our co-pending European patent application No. 96 20 3361 filed on even day herewith, that is on 28 november 1996.
  • This application relates to a thermal printer with one or a plurality of pressure rollers for increasing the angular contact area of a print-receiving sheet with a print drum.
  • Fig. 1 shows the general layout of one embodiment of a thermal printer according to the invention.
  • the apparatus is mounted in a housing 10 which comprises a magazine 11 for holding a stack 12 of sheets to be printed in an inwardly tilted position, a dispenser roller 13 for removing the sheets one by one from the stack and for feeding them upwardly, a driven print dry 15, a thermal head 16, a pressure roller 17, guides 18 with sheet driving rollers 19, a de-curl roller 20, an outlet tray 21, and control means 22 for controlling image acquisition and processing.
  • Thermal head 16 is mounted on a rigid frame 24 which is pivotable about axis 25 running strictly parallel with the print drum axis. Frame 24 bears at its free end a follower roller 26 riding on a rotatable cam 27.
  • a tension spring 28 urges the frame in the direction of the print drum.
  • Pressure roller 17 is mounted for free rotation in a frame 29, see also enlarged Fig. 2, which is pivotable about shaft 30 running likewise parallel to the print drum.
  • Frame 29 bears at its free end a follower roller 31 riding on a cam 32.
  • a tension spring 34 causes frame 29 to urge roller 17 towards the print drum.
  • cams 27 and 32 are mounted in the angular relationship as shown, on a common shaft 35 which is rotatable by a motor.
  • Dispenser roller 13 is controlled to remove upper sheet 38 from sheet stack 12. In the first instance, this sheet is buckled at its leading end by the abutting of its leading edge against the top wall of the magazine, see Fig. 2. Continued rotation of roller 13 causes the sheet buckle to increase in size until at a certain moment the leading sheet edge jumps over the edge of the magazine after which the sheet becomes further dispensed according to a linear path. The sheet is fed upwardly until its leading end takes a position between print drum 15 and thermal head 16 as shown in Fig. 3.
  • Sheet 38 is in this example a heat-sensitive sheet having a heat-sensitive layer coated on a polyethylene terephthalate support.
  • the heat-sensitive layer of all sheets faces downwardly in the drawings of Figs. 1 to 5.
  • Suitable thermographic materials for medical imaging based on silver behenate in thermal working relationship with a reducing agent are disclosed in our co-pending patent applications EP-A-0 669 875, EP-A-0 669 876 and EP-A-0 726 852.
  • roller pair 41, 41' which takes an intermediate position between the sheet stack and the print drum is closed and driven to cause the sheet taking the Fig. 3 position to move backwardly until it abuts with its trailing edge against stop 44, see Fig. 4.
  • gravity on itself may cause the sheet to move downwardly as roller 13 is lifted from the sheet but friction with machine parts and/or electrostatic attraction towards the next sheet, may reduce the mobility of the removed sheet and therefore it may be desirable to improve control over this backward motion by means of sheet driving rollers such as 41, 41'.
  • rollers 41, 41' may be limited through appropriate slip clutch means, so that the sheet does not become exaggeratedly buckled as its motion is stopped by contact of its trailing edge with stop 44, or said rollers may be driven by appropriately timing their driving so that this is stopped at the time the sheet contacts the sheet stop.
  • the sheet now takes a position which is ready for starting preprinting.
  • Fig. 5 shows the printing position of the printhead in broken lines (the corresponding position of the cams has not been shown).
  • Fig. 5 shows the printing position of the printhead in broken lines (the corresponding position of the cams has not been shown).
  • the printing quality may be unsatisfactory because of unsufficient control of the speed of the sheet.
  • frictional contact between sheet and print drum under the bias of the thermal head is limited to a small area only. Therefore, it is desirable to increase the angle of wrap of the sheet around the drum, and this occurs in the apparatus according to the present embodiment by pressure roller 17 which is moved from its rest position as shown in Fig. 1 to its operative position shown in broken lines in Fig.
  • de-curl roller 20 which is a heated roller in contact with the rear side of the sheet in order to compensate for curling stresses which have been introduced in the sheet by the image-wise heating of its front side.
  • de-curl roller 20 which is a heated roller in contact with the rear side of the sheet in order to compensate for curling stresses which have been introduced in the sheet by the image-wise heating of its front side.
  • the driving and the machining of the de-curl roller are in principle less accurate than those of the print drum and therefore it is desirable not to let interfere the sheet drive of roller 20 with that of drum 15.
  • the length of the sheet path between 15 and 20 is therefore larger than the length of the largest sheet to be printed in the apparatus, and the sheet transport between both said rollers can occur by driven pressure rollers 19 taking an open position as shown in Fig. 1, and being closed as the last image line on the sheet has been printed thereby taking over the sheet drive from the print drum before the trailing sheet edge passes beyond printing array 39.
  • Sheet feeding rollers 13 and 41 operate in detail as follows.
  • the rollers are mounted between pairs of arms 43 and 45, see Fig. 2, that are pivotable about pivots 46 and 47, respectively.
  • Driven gears 48 and 49 are mounted on the pivots and engage corresponding gears 50 and 51 on the sheet feeding rollers.
  • the driven shaft of these rollers is coupled via a slip clutch with a fixed shaft.
  • Clockwise rotation of gear 48 causes arm 43 to swing clockwise as well because the slip clutch on the shaft of gear 50 opposes in a first instance the rotation of the roller.
  • Anti-clockwise rotation of gear 48 causes arms 43 to retract from the sheet.
  • the same principle of operation counts for the sheet-returning mode of roller 41, roller 41' being mounted bodily stationary.
  • Sheet stop 44 is a lever with legs 52 and 53 and is freely pivotable about pivot 54 mounted in a bracket (not shown) making part of the magazine. Leg 52 rests by gravity on the top sheet of stack 12 and engages the next sheet as the top one is being removed.
  • Leg 52 freely extends through a corresponding opening in top wall 56 of the magazine.
  • the magazine is composed of two compartments, viz. an outside one 61 and an inside one 62 being pivotally connected to the outside one at 63.
  • Outside compartment 61 is mounted in lid 64 which is pivotally mounted to the apparatus with hinge 65 and has a handle 67 for its opening and closing.
  • Sheet stop 44 is swung anti-clockwise under the influence of gravity and rests with its leg 53 against wall 56 of the magazine.
  • compartment 62 of the magazine is connected at its rear side through a gas spring 68 with a fixed point of the apparatus and takes in the open position of the magazine a nearly vertical position.
  • Said compartment 62 has a sheet pressure plate 69 connected by springs 70 to bottom 71.
  • Sheet loading is now described with reference to Figs. 7 to 10.
  • the sheet pack to be loaded may be wrapped according to various techniques, but the one which will now be described by way of example has proved to be extremely convenient in practice and excludes almost any risk for improper manipulation by the operator.
  • a sheet pack 72 comprising sheet stack 77 wrapped in a moisture-tight sleeve-like wrapper 73 having a closed tail portion 74 and an open front portion 75 back-folded on the pack and kept closed by a sealing tape or warranty label 76, is slid in the open compartment 61 of the magazine as shown by the bold arrow in Fig. 7.
  • the operator removes sealing tape 76, see Fig. 8, and then withdraws wrapper 73 from the sheet stack by means of its tail portion 74, see Fig. 9.
  • the sheets of stack 77 are still held together by an encircling band or strap 78 which prevents mutual movement of the sheets as their wrapper is removed, or the remaining of one or more sheets in the removed wrapper. This strap is detached and next removed, see Fig. 10.
  • the strap just described may be removably attached to such board to further exclude mutual movements of the sheets during their loading.
  • the mentioned protective board e.g. a sheet of polypropylene or the like with a thickness of approximately 1.0 mm, remains on the stack.
  • lid 64 is now closed by swinging it in the position as shown in Fig. 1.
  • protective board 79 comes in contact with pressure plate 69.
  • Further closing of the lid causes the sheets first to compress springs 70 and next to swing magazine compartment 62 inwardly, thereby compressing gas spring 68 until the operative dispensing position of Fig. 1 is obtained.
  • the upper sheet of the stack is withheld only by engagement of its trailing and leading margins by corresponding lips of the magazine, and thus engagement of the sheet by dispensing roller 13 provokes its removal from the stack as described hereinbefore.
  • brackets such as 80 shown in broken lines in Fig. 6 which can be fitted at different heights in the magazine and which reduce the available length for the sheets.
  • Sheet stop 44 needs to be adjusted accordingly and this may occur by arranging wall 56 for the mounting of such stop at different heights.
  • protective foil 79 remains in magazine 11. After the magazine has been opened, see Fig. 12, this foil has to be taken away as shown by the bold arrow before a next sheet pack can be loaded.
  • the printer according to the present invention includes also a mechanism for the lateral positioning of a sheet taken from the stack of sheets.
  • a margin of uniform width is important for the appaerance of the printed image, and in consequence an accurate lateral position of the sheet is important as well.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handling Of Cut Paper (AREA)
  • Electronic Switches (AREA)
EP19970203596 1996-11-28 1997-11-18 Thermodrücker mit blattzuführmitteln Expired - Lifetime EP0855284B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19970203596 EP0855284B1 (de) 1996-11-28 1997-11-18 Thermodrücker mit blattzuführmitteln

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP96203359 1996-11-28
EP96203359 1996-11-28
EP19970203596 EP0855284B1 (de) 1996-11-28 1997-11-18 Thermodrücker mit blattzuführmitteln

Publications (2)

Publication Number Publication Date
EP0855284A1 true EP0855284A1 (de) 1998-07-29
EP0855284B1 EP0855284B1 (de) 2001-03-14

Family

ID=26143373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970203596 Expired - Lifetime EP0855284B1 (de) 1996-11-28 1997-11-18 Thermodrücker mit blattzuführmitteln

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069468A (en) * 1980-02-11 1981-08-26 Exxon Research Engineering Co Method of and apparatus for feeding and registering sheets for facsimile recording
US4888602A (en) * 1986-12-25 1989-12-19 Canon Kabushiki Kaisha Recording apparatus with bipositional sheet guiding member
EP0485786A1 (de) * 1990-10-26 1992-05-20 Canon Kabushiki Kaisha Blattzuführgerät
GB2297315A (en) * 1992-10-08 1996-07-31 Seiko Epson Corp Removing skew from paper fed to a printer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069468A (en) * 1980-02-11 1981-08-26 Exxon Research Engineering Co Method of and apparatus for feeding and registering sheets for facsimile recording
US4888602A (en) * 1986-12-25 1989-12-19 Canon Kabushiki Kaisha Recording apparatus with bipositional sheet guiding member
EP0485786A1 (de) * 1990-10-26 1992-05-20 Canon Kabushiki Kaisha Blattzuführgerät
GB2297315A (en) * 1992-10-08 1996-07-31 Seiko Epson Corp Removing skew from paper fed to a printer

Also Published As

Publication number Publication date
EP0855284B1 (de) 2001-03-14

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