EP1053869B1 - Verfahren und Vorrichtung zur Herstellung wärmeempfindlicher Druckschablonen - Google Patents

Verfahren und Vorrichtung zur Herstellung wärmeempfindlicher Druckschablonen Download PDF

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Publication number
EP1053869B1
EP1053869B1 EP20000110725 EP00110725A EP1053869B1 EP 1053869 B1 EP1053869 B1 EP 1053869B1 EP 20000110725 EP20000110725 EP 20000110725 EP 00110725 A EP00110725 A EP 00110725A EP 1053869 B1 EP1053869 B1 EP 1053869B1
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EP
European Patent Office
Prior art keywords
scanning direction
stencil master
sub
printing
main scanning
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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.)
Expired - Fee Related
Application number
EP20000110725
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English (en)
French (fr)
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EP1053869A2 (de
EP1053869A3 (de
Inventor
Kunio c/o Riso Kagaku Corp. R&D Center Nomura
Shinichi c/o Riso Kagaku Co. R&D Center Takizawa
Hikaru c/o Riso Kagaku Corp. R&D Center Oike
Yoshiyuki c/o Riso Kagaku Corp. R&D Center Okada
Yukio c/o Riso Kagaku Corp. R&D Center Irie
Yasuhiro c/o Riso Kagaku Co. R&D Center Fujimoto
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Riso Kagaku Corp
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Riso Kagaku Corp
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Publication date
Application filed by Riso Kagaku Corp filed Critical Riso Kagaku Corp
Publication of EP1053869A2 publication Critical patent/EP1053869A2/de
Publication of EP1053869A3 publication Critical patent/EP1053869A3/de
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Publication of EP1053869B1 publication Critical patent/EP1053869B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
    • B41C1/144—Forme preparation for stencil-printing or silk-screen printing by perforation using a thermal head

Definitions

  • This invention relates to a method of and an apparatus for making a stencil master by imagewise perforating a heat-sensitive stencil master material by use of a thermal head comprising a plurality of heater elements, and more particularly to such a method and an apparatus in which setoff and/or strike through can be suppressed.
  • thermoplastic resin film of a heat-sensitive stencil master material thermally perforate the thermoplastic resin film.
  • stencil printer which makes print using a stencil master made by the stencil master making apparatus.
  • FIG 8 shows an example of such a heat-sensitive stencil master making apparatus.
  • a heat-sensitive stencil master material 1 in a continuous length is conveyed in the direction of arrow A by a platen roller 3 driven by an electric motor (not shown) and passed between the platen roller 3 and a thermal head 4.
  • the heat-sensitive stencil master material 1 has a thermoplastic resin film on one side thereof and resistance heater elements 40 of the thermal head 4 are pressed against the thermoplastic resin film of the material 1 when the material 1 is passed between the platen roller 3 and the thermal head 4.
  • FIG 9 is an enlarged schematic plan view of the thermal head 4.
  • the thermal head 4 comprises a plurality of rectangular resistance heater elements 40 arranged in a row in a main scanning direction (a direction perpendicular to a sub-scanning direction which is the direction in which the stencil master material 1 is conveyed relative to the thermal head 4).
  • the size A of each of the resistance heater elements 40 in the main scanning direction and the pitches p in which the resistance heater elements 40 are arranged in the main scanning direction (will be referred to as "the heater element pitches p ", hereinbelow) are determined according to a desired resolution of the stencil master making apparatus in the main scanning direction, and the size B of each of the resistance heater elements 40 in the sub-scanning direction is determined according to a desired resolution in the sub-scanning direction which is determined by feed pitches of the stencil master material 1 and/or the like.
  • One ends (as seen in the sub-scanning direction) of the resistance heater elements 40 are connected to a common electrode 42 and the other ends of the resistance heater elements 40 are respectively connected to discrete electrodes 43 so that electric power can be supplied to the resistance heater elements 40 independently of each other.
  • the resistance heater elements 40 are selectively energized by a thermal head drive means (not shown) and the portions of the thermoplastic resin film in contact with the energized resistance heater elements 40 are thermally perforated.
  • Each of the resistance heater elements 40 forms one picture element and a two-dimensional image is formed on the stencil master material 1 by moving the material 1 in the sub-scanning direction (the direction of arrow A) while selectively energizing the resistance heater elements 40.
  • a stencil master cut off the material 1 thus imagewise perforated is wound around a printing drum of a stencil printer (not shown) and ink is supplied to the stencil master 1 (reference numeral 1 will be sometimes used to denote the stencil master, hereinbelow), whereby ink is transferred to a printing paper through the perforations in the stencil master 1 and print is made.
  • the resolution of the printed image is expressed as 1/p.
  • the stencil master making apparatus which makes a stencil master in this manner is called a 1/p resolution stencil master making apparatus, and the stencil printer which makes print by use of a stencil master made in this manner is called a 1/p resolution stencil printer.
  • the distance p between the picture elements corresponds to each of the heater element pitches, the perforation pitches (pitches in which the heat-sensitive stencil master material 1 is perforated) and the printing pitches in the main scanning direction.
  • ink transferred to the printing paper through a perforation of the heat-sensitive stencil master 1 having a diameter of d1 spreads over an area which is d2 in diameter as shown in Figure 10.
  • the dot formed by ink transferred to the printing paper through a perforation of the stencil master 1 (the area of a diameter d2) will be referred to as "a printing dot", hereinbelow.
  • a stencil master in which perforations are separated from each other by a predetermined gap as shown in Figure 11A.
  • the gaps between the perforations are set so that ink spreading over the printing paper fills the gaps and printing dots form a continuous and uniform solid area as shown in Figure 11B.
  • the gaps between the perforations of the stencil master are too large, gaps are formed between the printing dots and the printing dots cannot form a continuous and uniform solid area.
  • This problem may be overcome by increasing the resolution of the stencil master making apparatus by use of a thermal head in which the heater element pitches are small and one picture element is formed by, for instance, a pair of heater elements.
  • this approach is disadvantageous in that the scanner and/or the image processing system must be modified to accommodate the increased resolution, which adds to the cost.
  • the primary object of the present invention is to provide a method of and an apparatus for making a stencil master which allow to make stencil printing so that setoff, strike through and/or rubbing off do not occur while ensuring sufficient image quality and uniformity of the solid printing without substantially increasing the cost or complicating the system even if stencil printing is made at low resolution by use of a low resolution stencil printer.
  • a method of making a heat-sensitive stencil master in which the stencil master is made by imagewise perforating a heat-sensitive stencil master material by use of a thermal head having a plurality of heater elements which are arranged in a main scanning direction and are respectively energized through discrete electrodes while the stencil master material is fed in a sub-scanning direction, wherein the improvement comprises the steps of perforating the heat-sensitive stencil master material by use of a thermal head in which each of the heater elements is divided into at least two segments which are connected to a common discrete electrode to be energized simultaneously with each other, and forming each picture element of the stencil master by two or more small perforations formed by the segments of each heater element.
  • the two or more small perforations forming each picture element may be formed either in one sub-scanning position or in a plurality of adjacent sub-scanning positions.
  • the two small perforations may be formed in one sub-scanning position by use of a thermal head in which each heater element is divided into two heater element segments arranged in the sub-scanning direction, or may be formed in two adjacent sub-scanning positions, each in one sub-scanning position, by use of a thermal head in which each heater element is not divided in the sub-scanning direction.
  • the two or more small perforations forming each picture element may partly overlap with each other.
  • an apparatus for carrying out the method of the present invention comprising: a thermal head having a plurality of heater elements which are arranged in a main scanning direction and are respectively energized through discrete electrodes while the stencil master material is fed in a sub-scanning direction, wherein the improvement comprises that each of the heater elements of the thermal head is divided into at least two segments which are connected to a common discrete electrode to be energized simultaneously with each other.
  • control means controls the perforation of the stencil master material by controlling the power supplied to the segments of the heater elements of the thermal head as well as the feed rate of the stencil master material in a sub-scanning direction.
  • each picture element of the stencil master is formed by a plurality of small perforations
  • each printing dot corresponding to one picture element of an image to be printed is formed by a plurality of small printing dots formed by ink transferred to the printing paper through the small perforations which are formed by the segments of the heater element, and accordingly setoff, strike through and rubbing off can be suppressed and at the same time uniformity of the solid printing can be ensured.
  • the scanner and/or the image processing system need not be modified to accommodate increased resolution, and accordingly the cost is not increased.
  • the heat-sensitive stencil master material When perforation of the heat-sensitive stencil master material is controlled so that the proportion of open area Q is in the range identified above, the heat-sensitive stencil master material can be perforated in a desirable manner in both the main scanning direction, whereby the sub-scanning direction and the shape of each printing dot is stabilized, the occurrence of thin spots in the solid image can be prevented, and excellent printing can be performed with the perforations kept independent.
  • this invention has been made on the basis of the discovery that when each printing dot corresponding to one picture element of an image is formed by a plurality of small printing dots, setoff, strike through and rubbing off can be suppressed to an extent equivalent to high resolution printing and at the same time uniformity of the solid printing can be ensured. This point will be described first.
  • Printing was made by replacing each printing dot shown in Figure 2A with four small printing dots so that the area covered by the four small printing dots (e.g., the area shown by the thick line in Figure 2B) became substantially equal to the area of each printing dot shown in Figure 2A (e.g., the area shown by the thick line in Figure 2A) and the same printing resolution was held.
  • the printing performance against setoff, strike through and rubbing off was improved to as high as printing at a higher resolution while uniformity of solid printing was maintained. Further it has been empirically found that excellent printing can be obtained when said proportion of open area Q is not smaller than 20% and not larger than 70%.
  • FIG. 3 shows a heat-sensitive stencil master making apparatus 10 in accordance with an embodiment of the present invention.
  • a heat-sensitive stencil master material 1 in a continuous length is conveyed in the direction of arrow A by a conveyor means 9 comprising a platen roller 3 driven by an electric motor (not shown) and passed between the platen roller 3 and a thermal head 5.
  • the electric motor for driving the platen roller 3 is driven by a motor drive means 8.
  • FIG 4 is an enlarged fragmentary view showing a part of the thermal head 5.
  • the thermal head 5 comprises a plurality of resistance heater elements 50 arranged in a row in the main scanning direction (a direction perpendicular to the sub-scanning direction in which the heat-sensitive stencil master material 1 is conveyed relative to the thermal head 5).
  • the sizes and the pitches of the resistance heater elements 50 in the main scanning direction are determined according to the resolution of the apparatus 10 in the main scanning direction, and the sizes of the resistance heater elements 50 in the sub-scanning direction are determined according to the resolution of the apparatus 10 in the sub-scanning direction which is determined by feed pitches of the stencil master material 1 in the sub-scanning direction.
  • Each of the resistance heater elements 50 are divided in the main scanning direction into a pair of rectangular heater element segments 50a and 50b.
  • Each pair of heater element segments 50a and 50b are connected to each other through an intermediate conductor 54 and are connected in series between a common electrode 52, which is common to all the resistance heater elements 50, and a discrete electrode 53 which is connected to a driver IC 55. That is, the pair of heater element segments 50a and 50b of each resistance heater element 50 are simultaneously energized by the driver IC 55 to thermally perforate the parts of the heat-sensitive stencil master material 1 in contact therewith.
  • the motor drive means 8 and each driver IC of the thermal head 5 are connected to a controller 7.
  • the controller 7 supplies power to the heater element segments 50a and 50b of the respective resistance heater elements 50 and controls the feed rate of the heat-sensitive stencil master material 1 so that the proportion of open area Q is in a predetermined range, whereby uniformity of solid printing is maintained without occurrence of setoff and the like and excellent printing can be performed with the perforations kept independent.
  • one picture element of the stencil master is formed by four small perforations two of which are formed by the respective heater element segments 50a and 50b of each resistance heater element 50 on one main scanning line (in one sub-scanning position) and the other two of which are formed by the respective heater element segments 50a and 50b of the same resistance heater element 50 on the adjacent main scanning line (in the adjacent sub-scanning position).
  • Ink transferred to the printing paper through the four small perforations forms one printing dot.
  • a stencil master can be made at high resolution.
  • the four small perforations for one printing dot may be formed by the same data and the scanner and the image processing system may be of the same resolution as represented by the number of the discrete electrodes 53. That is, unlike when the resolution of the stencil master making apparatus is simply increased, it is unnecessary to modify the scanner and/or the image processing system to accommodate increased resolution, and accordingly the cost is not increased.
  • the heater element segments 50a and 50b are arranged at perforation pitches of 600dpi and the feed pitch of the stencil master material 1 in the sub-scanning direction is set at 600dpi.
  • a scanner and an image processing system for 300dpi are used.
  • each printing dot for 300dpi can be formed by four small perforations for 600dpi.
  • Figure 5A shows the relation between the printing dots and the perforations when each printing dot at 300dpi is formed by one perforation at 300dpi in making uniform solid printing
  • Figure 5B shows the relation between the printing dots and the perforations when each printing dot at 300dpi is formed by four small perforations at 600dpi in making uniform solid printing.
  • the smaller circles indicated at Y are the perforations
  • the larger circles indicated at Z are the printing dots.
  • the proportion of open area Q is 40% and in the case of the perforation at 600dpi, the proportion of open area Q is 30%.
  • each printing dot at 300dpi shown in Figure 5A is formed by a plurality of small printing dots at 600dpi shown in Figure 5B in making solid printing
  • the amount of ink transferred to the printing paper is reduced as compared with when each printing dot is formed by a single printing dot as can be understood from Figure 1, whereby the printing performance against setoff, strike through and rubbing off is improved and at the same time uniformity of solid printing is maintained.
  • each picture element of the stencil master may be formed by 2 ⁇ 1 small perforations (two small perforations arranged in a row in the main scanning direction) or 3 ⁇ 3 small perforations. This can be realized by so setting the number of the heater element segments of each resistance heater element and/or the feed pitches of the printing paper. Further it is possible to form each printing dot at 200dpi by a plurality of small printing dots at 400dpi.
  • the printing resolution can be of any value.
  • the proportion of open area Q is 40% in the case of the perforation at 300dpi, and 30% in the case of the perforation at 600dpi, the proportion of open area Q need not be limited to those values. It has been found that when the proportion of open area Q is not smaller than 20% and not larger than 70%, the amount of ink transferred to the printing paper is reduced, whereby the printing performance against setoff, strike through and rubbing off is improved and at the same time uniformity of solid printing is maintained.
  • the length of one picture element in the main scanning direction is represented by a
  • the length of one picture element in the sub-scanning direction is represented by b
  • the area of the small perforation formed by each of the segments of each heater element is represented by S
  • the number of the small perforations forming each picture element as numbered in the main scanning direction is represented by n ( n being an integer not smaller than 2)
  • the number of the small perforations forming each picture element as numbered in the sub-scanning direction is represented by m ( m being an integer not smaller than 1) as shown in Figure 6
  • the proportion of open area Q is defined by the following formula for an area which is a/n in length in the main scanning direction and b/m in length in the sub-scanning direction.
  • Q(%) [S/ ⁇ (a/n) ⁇ (b/m) ⁇ ] ⁇ 100
  • FIG. 7 is an enlarged fragmentary view showing a part of a thermal head 6 which can be also employed in the heat-sensitive stencil master making apparatus 10.
  • the thermal head 6 comprises a plurality of resistance heater elements 60 arranged in a row in the main scanning direction (a direction perpendicular to the sub-scanning direction in which the heat-sensitive stencil master material 1 is conveyed relative to the thermal head 6).
  • the sizes and the pitches of the resistance heater elements 60 in the main scanning direction are determined according to the resolution of the apparatus 10 in the main scanning direction, and the sizes of the resistance heater elements 60 in the sub-scanning direction are determined according to the resolution of the apparatus 10 in the sub-scanning direction which is determined by feed pitches of the stencil master material 1 in the sub-scanning direction.
  • Each of the resistance heater elements 60 are divided in the main scanning direction into a pair of rectangular heater element segments 60a and 60b.
  • the heater element segments 60a and 60b are of slit type, and are connected in parallel between a common electrode 62, which is common to all the resistance heater elements 60, and a discrete electrode 63 which is connected to a driver IC 65. That is, the pair of heater element segments 56a and 60b of each resistance heater element 60 are simultaneously energized by the driver IC 65 to thermally perforate the parts of the heat-sensitive stencil master material 1 in contact therewith.
  • one picture element of the stencil master may be formed by four small perforations two of which are formed by the respective heater element segments 60a and 60b of each resistance heater element 60 on one main scanning line (in one sub-scanning position) and the other two of which are formed by the respective heater element segments 60a and 60b of the same resistance heater element 60 on the adjacent main scanning line (in the adjacent sub-scanning position).
  • Ink transferred to the printing paper through the four small perforations forms one printing dot.
  • one printing dot at 300dpi can be formed by four small printing dots at 600dpi.
  • the thermal head 5 when each printing dot at 300dpi is formed by four small printing dots at 600dpi by use of the thermal head 6, the amount of ink transferred to the printing paper is reduced as compared with when each printing dot at 300dpi is formed by a single printing dot, whereby the printing performance against setoff, strike through and rubbing off is improved and at the same time uniformity of solid printing is maintained.
  • each picture element of the stencil master may be formed by 2 ⁇ 1 small perforations (two small perforations arranged in a row in the main scanning direction) or 3 ⁇ 3 small perforations. This can be realized by so setting the number of the heater element segments of each resistance heater element and/or the feed pitches of the printing paper. Further it is possible to form each printing dot at 200dpi by a plurality of small printing dots at 400dpi.
  • the printing resolution can be of any value.
  • dpi refers to dots per inch which is equivalent to dots per 2.54 cm

Claims (4)

  1. Verfahren zum Herstellen eines wärmeempfindlichen Schablonenmasters, bei dem der Schablonenmaster hergestellt wird durch bildweises Perforieren eines wärmeempfindlichen Schablonenmastermaterials unter Verwendung eines Thermokopfs mit mehreren Heizelementen, die in einer Hauptabtastrichtung angeordnet sind und jeweils über diskrete Elektroden gespeist werden, während das Schablonenmastermaterial in einer Nebenabtastrichtung transportiert wird, umfassend folgende Schritte:
    Perforieren des wärmeempfindlichen Schablonenmastermaterials unter Verwendung eines Thermokopfs, in welchem jedes der Heizelemente in mindestens zwei Segmente unterteilt wird, die an eine gemeinsame diskrete Elektrode angeschlossen sind, um gleichzeitig gespeist zu werden, und
    Bilden jedes Bildelements des Schablonenmaster durch zwei oder mehr kleine Perforierungen, die von den Segmenten jedes Heizelements erzeugt werden.
  2. Verfahren nach Anspruch 1, bei dem die Perforation des Schablonenmastermaterials in derartiger Weise ausgeführt wird, daß das Verhältnis der offenen Fläche Q, die durch die unten angegebene Formel für eine Fläche angegeben ist, deren Länge a/n in Hauptabtastrichtung und b/m in Nebenabtastrichtung entspricht, nicht kleiner als 20 % und nicht größer als 70 % wird, Q(%) = [S/{(a/n) x (b/m)}] x 100 wobei a die Länge eines Bildelements in der Hauptabtastrichtung, b die Länge eines Bildelements in Nebenabtastrichtung, S die Fläche der kleinen Perforierung, die durch jedes der Segmente des Heizelements gebildet wird, n die Anzahl der kleinen Perforierungen, die jedes Bildelement bilden, gezählt in Hauptabtastrichtung, und m die Anzahl der kleinen Perforierungen, die jedes Bildelement definieren, gezählt in Nebenabtastrichtung, und n eine natürliche Zahl nicht kleiner als 2 und m eine natürliche Zahl nicht kleiner als 1 ist.
  3. Vorrichtung zum Herstellen eines wärmeempfindlichen Schablonenmasters durch bildweises Perforieren eines wärmeempfindlichen Schablonenmastermaterials unter Einsatz eines Thermokopfs, der mehrere Heizelement besitzt, die in einer Hauptabtastrichtung angeordnet sind und über diskrete Elektroden gespeist werden, während das Schablonenmastermaterial in einer Nebenabtastrichtung transportiert wird, dadurch gekennzeichnet, daß jedes der Heizelemente des Thermokopfs in mindestens zwei Segmente unterteilt ist, die an einer gemeinsame diskrete Elektrode angeschlossen sind, um gleichzeitig gespeist zu werden.
  4. Vorrichtung nach Anspruch 3, umfassend eine Steuereinrichtung, die das Perforieren des Schablonenmastermaterials derart steuert, daß das Verhältnis einer offenen Fläche Q, die durch die unten angegebene Formel für eine Fläche angegeben ist, deren Länge a/n in Hauptabtastrichtung und b/m in Nebenabtastrichtung entspricht, nicht kleiner als 20 % und nicht größer als 70 % wird, Q(%) = [S/{(a/n) x (b/m)}] x 100 wobei a die Länge eines Bildelements in der Hauptabtastrichtung, b die Länge eines Bildelements in Nebenabtastrichtung, S die Fläche der kleinen Perforierung, die durch jedes der Segmente des Heizelements gebildet wird, n die Anzahl der kleinen Perforierungen, die jedes Bildelement bilden, gezählt in Hauptabtastrichtung, und m die Anzahl der kleinen Perforierungen, die jedes Bildelement definieren, gezählt in Nebenabtastrichtung, und n eine natürliche Zahl nicht kleiner als 2 und m eine natürliche Zahl nicht kleiner als 1 ist.
EP20000110725 1999-05-21 2000-05-19 Verfahren und Vorrichtung zur Herstellung wärmeempfindlicher Druckschablonen Expired - Fee Related EP1053869B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14130099A JP2000326474A (ja) 1999-05-21 1999-05-21 感熱孔版原紙の製版方法および感熱製版装置
JP14130099 1999-05-21

Publications (3)

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EP1053869A2 EP1053869A2 (de) 2000-11-22
EP1053869A3 EP1053869A3 (de) 2003-02-05
EP1053869B1 true EP1053869B1 (de) 2004-08-04

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EP20000110725 Expired - Fee Related EP1053869B1 (de) 1999-05-21 2000-05-19 Verfahren und Vorrichtung zur Herstellung wärmeempfindlicher Druckschablonen

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DE (1) DE60012615D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002127352A (ja) * 2000-10-27 2002-05-08 Tohoku Ricoh Co Ltd 製版装置・孔版印刷装置・製版方法
JP3811406B2 (ja) 2001-08-02 2006-08-23 デュプロ精工株式会社 孔版印刷の製版方法および製版装置ならびに孔版印刷機
JP4589800B2 (ja) * 2004-09-08 2010-12-01 アルプス電気株式会社 サーマルヘッド及びその製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS595436B2 (ja) * 1982-07-12 1984-02-04 エプソン株式会社 感熱ドツトプリンタの通電制御方法
JPS6027560A (ja) * 1983-07-25 1985-02-12 Matsushita Electric Ind Co Ltd 感熱記録ヘツド
JPS61293871A (ja) * 1985-06-21 1986-12-24 Nec Corp 薄膜型サ−マルヘツド
US5095318A (en) * 1989-03-20 1992-03-10 Shinko Electric Co., Ltd. Thermal head with dot size control means
JPH04348956A (ja) * 1991-01-22 1992-12-03 Ricoh Co Ltd サーマルヘッド
US5592209A (en) * 1991-02-21 1997-01-07 Riso Kagaku Corporation Device and method for dot-matrix thermal recording
GB2287224B (en) * 1994-03-02 1997-08-13 Tohoku Ricoh Co Limited Control device for a thermosensitive stencil printer
FR2730667A1 (fr) * 1995-02-22 1996-08-23 Axiohm Dispositif d'impression thermique

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EP1053869A2 (de) 2000-11-22
EP1053869A3 (de) 2003-02-05
DE60012615D1 (de) 2004-09-09
JP2000326474A (ja) 2000-11-28

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