WO1997001443A1 - Tete thermique pour transfert de vernis epais - Google Patents
Tete thermique pour transfert de vernis epais Download PDFInfo
- Publication number
- WO1997001443A1 WO1997001443A1 PCT/FR1996/001000 FR9601000W WO9701443A1 WO 1997001443 A1 WO1997001443 A1 WO 1997001443A1 FR 9601000 W FR9601000 W FR 9601000W WO 9701443 A1 WO9701443 A1 WO 9701443A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermal head
- pads
- ribbon
- varnish
- head according
- Prior art date
Links
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
- B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
Definitions
- the present invention relates to the deposition of varnish by thermal transfer, and in particular the deposition of a protective varnish on a plastic card such as a smart card, a magnetic card, a badge, etc.
- the present invention relates more particularly to a thermal head for transferring onto a surface to be varnished a layer of varnish present on a tape.
- FIG. 2 schematically illustrates a conventional method of depositing varnish on a plastic card 4 by means of the ribbon 1 of FIG. 1.
- a print head 5 comprising a heating end 5-1 provided with a plurality of heating points 5- 2, presses the ribbon 1 against the card 4.
- the print head 5 is stationary, the card 4 and the ribbon 1 move at the same speed in a direction D.
- the layer of varnish 3 of the ribbon 1 is brought to its transfer temperature, of the order of 180 to 200 ° C., and separates from the polyester film 2 to be fixed on the card 4.
- FIG. 3 illustrates a conventional method of depositing varnish suitable for very thick ribbons.
- the ribbon 1 to be varnished is partially wound, along an angular sector A, around a large flexible flexible cylinder 10 which is rotatable.
- the surface of the cylinder 10 is heated by electrical resistors 11 and the angular sector A receiving the ribbon 1 comes into crushing against the plastic card 4.
- This method however has drawbacks. On the one hand, it is difficult to control the temperature of the cylinder 10, and therefore the thickness of the varnish deposited. On the other hand, due to the large contact surface between the cylinder 10 and the card 4 and the high temperature of the cylinder 10, this method causes the card 4 to bend which must then be straightened by mechanical means.
- an objective of the present invention is to provide a means for transferring thick varnish which does not have such drawbacks.
- a thermal head for transferring onto a surface to be varnished a layer of varnish present on a ribbon, comprising a first means of heating the ribbon for transferring the layer of varnish onto the surface to be varnished and a second means of preheating tape, arranged before the first heating means in a direction of travel of the tape, in which the first and second means are heating pads, and the pads are mounted floating on the body of the thermal head by means of a hinged system and with springs.
- the hinges comprise compacts formed in the pads and articulated on protuberances of the body of the thermal head.
- the body of the thermal head comprises two cavities in which are compressed two springs exerting on the pads a rotational force around the hinges, the rotation of the pads being limited by stops arranged opposite the hinges.
- the pads are heated by heating plates comprising an electrical resistance formed by depositing thin layers or by screen printing.
- FIG. 1 is a sectional view of a varnishing tape and has been described previously
- FIG. 2 represents a conventional method of depositing varnish by thermal transfer and has been described previously
- FIG. 3 represents another conventional method of depositing varnish by thermal transfer and has been described previously
- - Figure 4 is a sectional view along an axis AA 'of a first embodiment of a thermal head according to the present invention
- - Figure 4A is a sectional view along an axis BB' of a part of the thermal head of FIG. 4,
- FIG. 5 represents a bottom view of the thermal head of FIG. 4,
- FIG. 6 represents a heating element of the thermal head of FIG. 4,
- FIG. 7 is a sectional view of a second embodiment of a thermal head according to the present invention.
- Figures 4 and 5 show respectively a sectional view and a bottom view of a thermal head 80 according to the present invention, the section of Figure 4 being made along an axis AA 'shown in Figure 5.
- Figure 4 also shows elements of a device for varnishing plastic cards in which the thermal head 80 is arranged.
- a varnish ribbon 20 of the type already described is thus distinguished, rollers 21, 22 for guiding the ribbon 20, as well as an arm 24 for lifting the thermal head 80 sliding vertically under the action of a linear motor 25, the thermal head 80 can thus occupy a high position and a low position.
- Below the ribbon 20 is a plastic card 26 resting on a conveyor roller 27.
- other conventional elements of the device such as means for winding and passing the ribbon 20 and others rollers for guiding the ribbon 20 and for conveying the card 26, are not shown in FIG. 4.
- the thermal head 80 comprises two heating pads 60, 70.
- the pads 60, 70 are mounted on a block 50 forming the body of the thermal head and fixed by screws 23 to the lifting arm 24.
- the first pad 60 is a varnish transfer pad disposed in a contact plane of the thermal head 80 with the card 26.
- the second pad 70 is a tape preheating pad 20 disposed in a plane that is substantially inclined, set back from the contact plane.
- solid lines represent the thermal head 80 in the high position
- dotted lines represent the pads 60, 70 and the ribbon 20 when the head 80 is in the low position, that is to say in position transfer.
- the card 26 and the ribbon 20 run at the same speed in the same direction S, the head 80 being stationary.
- the ribbon 20 slides on the preheating pad 70 before being pressed against the card 26 by the transfer pad 60.
- the preheating pad 70 disposed before the transfer pad 60 in the direction S of travel of the ribbon 20, sends in the ribbon 20 a first quantity of heat.
- this heat has already propagated in the thickness of the ribbon and the pad 60 provides additional energy making it possible to bring the varnish to its transfer temperature, of the order from 180 to 200 ° C.
- the thermal head 80 is particularly suitable for the use of a strip 20 of very thick.
- the deposition of varnish can be carried out with a high speed of travel of the ribbon 20, of the order of several centimeters per second.
- a person skilled in the art will determine the respective temperatures of the pads 60 and 70 as a function of the intended application, operating conditions, type of tape used, etc.
- the preheating and heating temperatures will be chosen as a function of the thickness of the ribbon but also as a function of parameters such as the size of the pads and the speed of travel of the ribbon, which determine the time during which the ribbon is in contact. skates.
- the shoe 70 may prove to be useless and be deactivated.
- the pads 60, 70 are made of aluminum and the block 50 is made of a material
- the pads 60,70 of rectangular shape, are arranged transversely to the tape and have in the direction of travel of the ribbon 20 a width of the order of a centimeter and transversely to the ribbon 20 a length of a few centimeters, at least equal to the width of the ribbon 20.
- On a longitudinal edge of each pad 60, 70 we finds a groove 61, 71 which is articulated on a longitudinal projection 51, 52 of the block 50, the assembly forming a hinge.
- fixing screws 62, 72 visible in FIG. 5 pass through the pads 60, 70 and are received in the block 50.
- the shoe 60 pivots around the hinge formed by the groove 61 and the projection 51, and comes into abutment against the head of the screw 62 which is not tightened to its maximum. It is also noted that the head of the screw 62 is housed in a recess 67 formed on the surface of the pad 60 so as not to damage the ribbon 20. Furthermore, it can be seen in FIG. 4 that the block 50 has between the two pads 60 , 70 a recess 55 in which is housed the guide roller 21 of the ribbon 20 when the thermal head 80 is in the low position.
- FIG. 6 represents an exemplary embodiment of the heating plates 66, 76.
- the plates 66, 76 comprise a ceramic substrate '660 on which are deposited, using the technique of thin layers (vacuum deposition) or thick layers (serigraphy ), a heating resistor 661 in the form of a Greek and a thermistor 662 (that is to say a resistor whose value depends on the temperature) making it possible to control and regulate the temperature of the pads 66, 76.
- the electrical connection of the resistance 661 and thermistor 662 is provided by a row of metallized studs 663. If we refer again to FIG. 4, we see that the plates 66, 76 are electrically connected by wires 56, 57 to a housing 58 of electrical supply ensuring the control and regulation of the temperature of the pads 60, 70.
- FIG. 7 represents a thermal head 100 comprising a single pad 90, heated for example by a plate 91.
- the surface of the pad 90 on which the ribbon 20 slides has a first zone 90-1 in a plane of contact of the thermal head with the card 26, equivalent to the pad 60 of FIG. 4, and is extended by a second substantially inclined preheating zone 90-2 progressively moving away from the contact plane with the card 26, equivalent to the pad 70 in FIG. 4.
- the pad 90 can extend beyond the area 90-2 to form a radiator 90-3 heat sink.
- a temperature gradient is created in the pad 90, giving the preheating zone 90-2 a temperature lower than that of the varnish transfer zone 90-1.
- a thermal head according to the present invention can be used to deposit a varnish on a surface other than that of a plastic card.
- a thermal head according to the present invention can also be used for the deposition of any substance other than a varnish, if this substance is transferable under the effect of heat.
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- Electronic Switches (AREA)
- Impression-Transfer Materials And Handling Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96924027A EP0835182A1 (fr) | 1995-06-27 | 1996-06-27 | Tete thermique pour transfert de vernis epais |
JP9504210A JP2000505717A (ja) | 1995-06-27 | 1996-06-27 | 厚いワニスのための発熱ヘッド |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9508008A FR2735994B1 (fr) | 1995-06-27 | 1995-06-27 | Tete d'impression pour transfert thermique de vernis epais |
FR95/08008 | 1995-06-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997001443A1 true WO1997001443A1 (fr) | 1997-01-16 |
Family
ID=9480638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1996/001000 WO1997001443A1 (fr) | 1995-06-27 | 1996-06-27 | Tete thermique pour transfert de vernis epais |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0835182A1 (fr) |
JP (1) | JP2000505717A (fr) |
FR (1) | FR2735994B1 (fr) |
WO (1) | WO1997001443A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5978006A (en) * | 1995-04-04 | 1999-11-02 | Gemplus | Thermal dye transfer printing method with electrical loss compensation |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5862075A (ja) * | 1981-10-09 | 1983-04-13 | Hitachi Ltd | 感熱記録装置 |
JPS6097884A (ja) * | 1983-11-01 | 1985-05-31 | Matsushita Electric Ind Co Ltd | 印字装置 |
JPS61290070A (ja) * | 1985-06-18 | 1986-12-20 | Fujitsu Ltd | 熱転写記録装置 |
JPS63188065A (ja) * | 1987-01-31 | 1988-08-03 | Nec Corp | 印字ヘツド |
JPS63288774A (ja) * | 1987-05-20 | 1988-11-25 | Alps Electric Co Ltd | 熱転写プリンタ |
US5079566A (en) * | 1989-10-11 | 1992-01-07 | Ricoh Company, Ltd. | Printing apparatus with a printhead having stratified recording electrodes, return electrode and preheating electrode for use with resistive thermal transfer ribbon |
JPH0485047A (ja) * | 1990-07-30 | 1992-03-18 | Toshiba Corp | 画像形成装置 |
-
1995
- 1995-06-27 FR FR9508008A patent/FR2735994B1/fr not_active Expired - Fee Related
-
1996
- 1996-06-27 JP JP9504210A patent/JP2000505717A/ja active Pending
- 1996-06-27 EP EP96924027A patent/EP0835182A1/fr not_active Withdrawn
- 1996-06-27 WO PCT/FR1996/001000 patent/WO1997001443A1/fr not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5862075A (ja) * | 1981-10-09 | 1983-04-13 | Hitachi Ltd | 感熱記録装置 |
JPS6097884A (ja) * | 1983-11-01 | 1985-05-31 | Matsushita Electric Ind Co Ltd | 印字装置 |
JPS61290070A (ja) * | 1985-06-18 | 1986-12-20 | Fujitsu Ltd | 熱転写記録装置 |
JPS63188065A (ja) * | 1987-01-31 | 1988-08-03 | Nec Corp | 印字ヘツド |
JPS63288774A (ja) * | 1987-05-20 | 1988-11-25 | Alps Electric Co Ltd | 熱転写プリンタ |
US5079566A (en) * | 1989-10-11 | 1992-01-07 | Ricoh Company, Ltd. | Printing apparatus with a printhead having stratified recording electrodes, return electrode and preheating electrode for use with resistive thermal transfer ribbon |
JPH0485047A (ja) * | 1990-07-30 | 1992-03-18 | Toshiba Corp | 画像形成装置 |
Non-Patent Citations (6)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 153 (M - 226) 5 July 1958 (1958-07-05) * |
PATENT ABSTRACTS OF JAPAN vol. 009, no. 245 (M - 418) 2 October 1985 (1985-10-02) * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 158 (M - 591) 22 May 1987 (1987-05-22) * |
PATENT ABSTRACTS OF JAPAN vol. 012, no. 464 (M - 771) 6 December 1988 (1988-12-06) * |
PATENT ABSTRACTS OF JAPAN vol. 013, no. 100 (M - 805) 9 March 1989 (1989-03-09) * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 306 (M - 1276) 6 July 1992 (1992-07-06) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5978006A (en) * | 1995-04-04 | 1999-11-02 | Gemplus | Thermal dye transfer printing method with electrical loss compensation |
Also Published As
Publication number | Publication date |
---|---|
EP0835182A1 (fr) | 1998-04-15 |
JP2000505717A (ja) | 2000-05-16 |
FR2735994B1 (fr) | 1997-08-29 |
FR2735994A1 (fr) | 1997-01-03 |
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