EP0765746A1 - Machine d'impression et procédé d'alimentation en feuilles sous plusieurs cylindres d'impression - Google Patents

Machine d'impression et procédé d'alimentation en feuilles sous plusieurs cylindres d'impression Download PDF

Info

Publication number: EP0765746A1
Authority: EP; European Patent Office
Prior art keywords: conveyor belt; ink transfer; printing machine; printing; pretension
Prior art date: 1995-09-29
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

EP96115358A

Other languages

German (de)

English (en)

Other versions

EP0765746B1 (fr

Inventor

Martin Greive

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.)

Heidelberger Druckmaschinen AG

Original Assignee

Heidelberger Druckmaschinen AG

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.)

1995-09-29

Filing date

1996-09-25

Publication date

1997-04-02

1996-09-25 Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG

1997-04-02 Publication of EP0765746A1 publication Critical patent/EP0765746A1/fr

1999-04-07 Application granted granted Critical

1999-04-07 Publication of EP0765746B1 publication Critical patent/EP0765746B1/fr

2016-09-25 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000007639 printing Methods 0.000 title claims description 50
238000000034 method Methods 0.000 title claims description 7
239000000758 substrate Substances 0.000 claims abstract description 8
230000006835 compression Effects 0.000 abstract 2
238000007906 compression Methods 0.000 abstract 2
239000000976 ink Substances 0.000 description 9
238000010586 diagram Methods 0.000 description 3
229910000831 Steel Inorganic materials 0.000 description 2
238000010276 construction Methods 0.000 description 2
230000036316 preload Effects 0.000 description 2
239000010959 steel Substances 0.000 description 2
239000000853 adhesive Substances 0.000 description 1
230000001070 adhesive effect Effects 0.000 description 1
230000003247 decreasing effect Effects 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
238000009826 distribution Methods 0.000 description 1
238000004519 manufacturing process Methods 0.000 description 1
238000003825 pressing Methods 0.000 description 1
238000000926 separation method Methods 0.000 description 1
230000035939 shock Effects 0.000 description 1
239000000725 suspension Substances 0.000 description 1
238000010023 transfer printing Methods 0.000 description 1

Images

Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines

Definitions

the invention relates to a printing press with an endless conveyor belt and a method for generating contact pressure during sheet transport along a plurality of forme cylinders by means of a conveyor belt.
a color copier is known from the brochure "RICOH NC 8015” from Ricoh, in which substrates to be printed, such as paper sheets, are conveyed on an endless conveyor belt along a plurality of ink transfer devices, which are arranged one behind the other at intervals along the conveyor belt and which are each cylindrical Have surface that is opposite the conveyor belt.
the invention has for its object to reduce the adjustment effort for setting several printing units in changing operating conditions.
Each ink transfer device can be a forme cylinder of a printing unit or a belt that feeds the ink from another point in the printing unit and rotates around a cylinder at which the ink is transferred to the substrates by printing.
the distribution of the contact pressure on the printing units is preset by the individual ink transfer devices are adjusted according to the desired contact pressure in the direction of the conveyor belt and away, and then only the bias is changed when z. B. changes the paper thickness.
the invention is particularly suitable for digital printing presses in which the back pressure required for perfect printing and the pulling forces from the forme cylinder are substantially smaller than in conventional printing presses.
the pretension for generating such a counter pressure can be generated simply by the fact that the conveyor belt is within its elastic range is kept tense.
the strength of the contact pressure can be controlled both by the pretension of the conveyor belt and by its modulus of elasticity.
the internal tension of the sheet is used better than with a straight sheet guide in order to detach the sheet from the forme cylinder after printing.
the printing press according to the invention has a very simple structure and is accordingly inexpensive to manufacture.
This printing machine has an endless conveyor belt 1 which rotates around two rollers 2 and 3 which are mounted at a distance and which conveys sheets not shown on its upper run, similar to the color copier mentioned above.
Four impression cylinders 5 are mounted below the upper run of the conveyor belt 1, each impression cylinder 5 being opposite a forme cylinder 4.
the conveyor belt 1 runs in a straight line between the forme cylinders 4 and impression cylinders 5, a contact force Fn acting perpendicularly to the surface of the forme cylinder 4 between a forme cylinder 4 and an impression cylinder 5, through the sheets conveyed on the conveyor belt 1 against the forme cylinder 4 are pressed in order to transfer printing inks from the forme cylinders 4 to the sheets one after the other.
the height of the forme cylinders 4 and / or the impression cylinders 5 can be adjusted individually for adjustment to different paper thicknesses.
FIG. 1 in which elements that correspond to elements from FIG. 5 are designated by the same reference numerals.
the printing machine shown in FIG. 1 differs from the machine shown in FIG. 5 in that it has no impression cylinders. Instead, it is provided that the forme cylinders 4 are arranged in such a way that the points adjacent to the conveyor belt 1 on the circumference of the forme cylinder 4 are more or less far below a plane which would correspond to a straight course of the upper run of the conveyor belt 1. In other words, the forme cylinders 4 are arranged such that the upper run of the conveyor belt 1 as a whole bends approximately parabolically in the direction of the lower run. However, the conveyor belt 1 runs in a straight line between each two forme cylinders 4, with the planes of the incoming part and the part of the conveyor belt 1 which intersect intersect at a small angle on each forme cylinder 4. In this state, the conveyor belt 1 is under a pretensioning force Fv.
Each forme cylinder 4 is wrapped around the conveyor belt 1 over a small part of its circumference, the wrap angle being equal to the angle at which the planes of the arriving part and the departing part of the conveyor belt 1 intersect on each forme cylinder 4.
a contact pressure Fn is exerted perpendicular to the surface of each forme cylinder 4, which depends on the pretensioning force Fv of the conveyor belt 1, as shown in the figure by four parallelograms of forces above the associated forme cylinder 4. Due to the parabolic arrangement of the equally spaced forme cylinders 4, the four contact forces Fn1 to Fn4 have the same magnitude.
One of the rollers 2, 3 is adjustable towards and away from the other by means of an adjusting device, not shown.
the adjusting device When the adjusting device is actuated, the pretensioning force Fv of the conveyor belt 1 changes, so that the pressing forces Fn1 to Fn4 can be increased or reduced together in this way.
the contact forces Fn1 to Fn4 on all printing units can be changed or adapted simultaneously if this is in operation
Printing press is required.
the printing press can be set to a new paper thickness or paper quality very quickly and easily, without having to make any adjustments to the individual printing units, as in conventional printing presses.
a tensile conveyor belt 1 with a high modulus of elasticity for. B. a conveyor belt 1 made of steel or with steel inserts, a large adjustment range can be covered with very small adjustment paths of the rollers 2, 3, so that the effective length of the conveyor belt 1 changes only slightly when the pretension is adjusted.
the pretension can be applied solely by the internal tension of the conveyor belt 1 with the rollers 2, 3 held in place.
an elastic suspension of one of the rollers 2, 3 may be provided.
each forme cylinder 4 is individually adjustable in the direction of the conveyor belt 1 and away from it in order to make certain basic settings. This is explained with reference to FIGS. 2 and 3, which differ from FIG. 1 only in the positions of the forme cylinders 4.
4 different contact forces Fn1 to Fn4 can be set by suitable positioning of the individual forme cylinders. This is e.g. B. advantageous if either less or more contact pressure is required to overprint an already printed color with the next color.
the forme cylinders 4 can be adjusted so that the contact forces Fn1 to Fn4 become smaller as the pressure progresses, as shown in FIG. 3. These contact forces can then also be increased or decreased together by adjusting the preload force Fv.
the invention is not limited to a more or less linear arrangement of the forme cylinders.
z. B. four forme cylinders 6 can be arranged one behind the other at intervals along an arc, the arc in the case shown being slightly more than 180 °.
a deflection roller 7, 8 is arranged in front of the first and behind the last forme cylinder 6 in the row, such that an endless conveyor belt 9 guided around the deflection rollers 7, 8 wraps around all four forme cylinders 6.
the returning run of the conveyor belt 9 is guided by two further deflecting rollers 10, 11 at a distance around the entire arrangement.
One of the deflection rollers 7, 8, 10, 11, here the deflection roller 10, is adjustable for setting the belt tension, as indicated by a double arrow P.
the belt tension By adjusting the belt tension, as in the previous embodiments, the contact forces between the forme cylinders 6 and the conveyor belt 9 can be changed together.
the circular arrangement of the forme cylinders 6 shown in FIG. 4 enables a relatively compact construction and is also of interest for machine constructions which have one or more elements which are used in common by all printing units and which can be arranged within a circle 12 shown in broken lines.
the positions of the forme cylinders 6 may have to be unchangeable; otherwise, the forme cylinder 6 can also be individually adjustable in the direction of the conveyor belt 9 and away from it in the embodiment of FIG. 4 in order to be able to adjust the respective contact forces.

Landscapes

Delivering By Means Of Belts And Rollers (AREA)
Inking, Control Or Cleaning Of Printing Machines (AREA)

EP96115358A 1995-09-29 1996-09-25 Machine d'impression et procédé d'alimentation en feuilles sous plusieurs cylindres d'impression Expired - Lifetime EP0765746B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE19536359		1995-09-29
DE19536359A DE19536359A1 (de)	1995-09-29	1995-09-29	Druckmaschine und Verfahren zum Bogentransport entlang mehrerer Formzylinder

Publications (2)

Publication Number	Publication Date
EP0765746A1 true EP0765746A1 (fr)	1997-04-02
EP0765746B1 EP0765746B1 (fr)	1999-04-07

Family

ID=7773607

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP96115358A Expired - Lifetime EP0765746B1 (fr)	1995-09-29	1996-09-25	Machine d'impression et procédé d'alimentation en feuilles sous plusieurs cylindres d'impression

Country Status (5)

Country	Link
US (1)	US5738010A (fr)
EP (1)	EP0765746B1 (fr)
JP (1)	JPH09123415A (fr)
AU (1)	AU701120B2 (fr)
DE (2)	DE19536359A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0999319B1 (fr)	1998-11-06	2005-01-26	Harol International N.V.	Dispositif de fixation et de verrouillage destine a un store extérieur ou une banne de protection solaire
DE10023151A1 (de) *	2000-05-12	2001-11-15	Nexpress Solutions Llc	Einrichtung zur Umlenkung von Riemen zum Transport flächigen Materials
CN113263826B (zh) *	2021-04-28	2024-12-13	温州市梦泰实业有限公司	一种紫光固化柔版印刷机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1338165A (en) *	1918-04-13	1920-04-27	Enameled Steel Sign Company	Printing-machine
DE587513C (de) *	1933-01-13	1933-11-04	Georg Boettinger	Gummiwalzendruckmaschine zum ein- und mehrfarbigen Bedrucken verschieden dicker Bogen
GB1154756A (en) *	1967-05-02	1969-06-11	Bowater Packaging Ltd	A Printing Machine for Printing Articles Supplied by an Endless Conveyor Belt

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1099560B (de) *	1958-03-11	1961-02-16	Wilhelm Ritzerfeld	Gegendruckelement fuer Rotationsvervielfaeltiger in Form eines rotierenden, den Druckzylinder teilweise umschliessenden Druckbandes
CH433174A (de) *	1965-07-02	1967-04-15	Buser Ag Maschf Fritz	Kontinuierlich arbeitende Vorrichtung zum Aufkleben eines zu bearbeitenden, insbesondere zu bedruckenden flächigen Gutes auf ein thermoplastbeschichtetes Transportband
US3934505A (en) *	1973-12-10	1976-01-27	Bernard Screen Printing Corporation	Method and apparatus for synchronous printing of a moving web
US4116127A (en) *	1975-11-17	1978-09-26	Brandt-Pra, Inc.	Ticket counter and endorser
JPS5827109B2 (ja) *	1977-12-21	1983-06-07	王子製袋株式会社	内容物充填後の袋の表面に印刷する方法及び装置
US4620807A (en) *	1985-09-23	1986-11-04	Xerox Corporation	Article transport for printers
DD264190A1 (de) *	1987-09-04	1989-01-25	Polygraph Leipzig	Schaufelradausleger zur schuppenauslage von druckprodukten
DE19527264A1 (de) *	1995-07-26	1997-01-30	Heidelberger Druckmasch Ag	Druckmaschine mit geradliniger Substratführung und Wendeeinrichtungen dafür

1995
- 1995-09-29 DE DE19536359A patent/DE19536359A1/de not_active Withdrawn
1996
- 1996-09-25 EP EP96115358A patent/EP0765746B1/fr not_active Expired - Lifetime
- 1996-09-25 DE DE59601597T patent/DE59601597D1/de not_active Expired - Fee Related
- 1996-09-27 US US08/722,369 patent/US5738010A/en not_active Expired - Lifetime
- 1996-09-27 JP JP8256738A patent/JPH09123415A/ja active Pending
- 1996-09-30 AU AU67904/96A patent/AU701120B2/en not_active Ceased

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1338165A (en) *	1918-04-13	1920-04-27	Enameled Steel Sign Company	Printing-machine
DE587513C (de) *	1933-01-13	1933-11-04	Georg Boettinger	Gummiwalzendruckmaschine zum ein- und mehrfarbigen Bedrucken verschieden dicker Bogen
GB1154756A (en) *	1967-05-02	1969-06-11	Bowater Packaging Ltd	A Printing Machine for Printing Articles Supplied by an Endless Conveyor Belt

Also Published As

Publication number	Publication date
EP0765746B1 (fr)	1999-04-07
DE59601597D1 (de)	1999-05-12
DE19536359A1 (de)	1997-04-10
US5738010A (en)	1998-04-14
AU6790496A (en)	1997-04-10
AU701120B2 (en)	1999-01-21
JPH09123415A (ja)	1997-05-13

Legal Events

Date	Code	Title	Description
1997-02-14	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1997-04-02	17P	Request for examination filed	Effective date: 19960925
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1998-09-02	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
1998-09-16	17Q	First examination report despatched	Effective date: 19980729
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1998-11-27	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
1999-02-19	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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