EP0463343A2 - Machine d'impression - Google Patents

Machine d'impression Download PDF

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Publication number
EP0463343A2
EP0463343A2 EP91107816A EP91107816A EP0463343A2 EP 0463343 A2 EP0463343 A2 EP 0463343A2 EP 91107816 A EP91107816 A EP 91107816A EP 91107816 A EP91107816 A EP 91107816A EP 0463343 A2 EP0463343 A2 EP 0463343A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
products
impression
grippers
pressure
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Withdrawn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
EP91107816A
Other languages
German (de)
English (en)
Other versions
EP0463343A3 (en
Inventor
Hermann Fischer
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.)
PRINT ASSIST AG
Original Assignee
PRINT ASSIST 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.)
Filing date
Publication date
Application filed by PRINT ASSIST AG filed Critical PRINT ASSIST AG
Publication of EP0463343A2 publication Critical patent/EP0463343A2/fr
Publication of EP0463343A3 publication Critical patent/EP0463343A3/de
Withdrawn legal-status Critical Current

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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
    • B41F21/08—Combinations of endless conveyors and grippers

Definitions

  • the invention relates to an impression machine for cut, preferably sheet-form products, with at least one printing unit, preferably sheet-fed rotary offset printing unit, which contains a cylinder provided with a cylinder pit, which transfers the ink to the printing material, preferably in the form of a rubber cylinder, with which a cylinder pit is also provided, in which grippers forming a row of grippers are arranged, the counter-pressure cylinder cooperates to form a pressure gap, the circumference of the counter-pressure cylinder being spaced from the circumference of the cylinder which cooperates with it to form the pressure gap, depending on the thickness of the processable products, preferably adjustable distance.
  • a sheet printing machine of this type is specified in the unpublished patent application P 39 40 019.
  • the impression cylinder interacts with a delivery drum opposite the blanket cylinder.
  • the products provided with an impression must therefore be guided around the impression cylinder.
  • this is only possible if the products are sufficiently flexible. Products made of rigid or less flexible material, such as cardboard, cannot be easily processed.
  • the generic arrangement accordingly turns out not to be universally usable enough.
  • the counter-pressure cylinder is assigned a circumferential gripper chain which is arranged in the direction of travel of the products next to the pressure gap and which has at least one row of grippers which can be brought into engagement with the row of grippers of the counter-pressure cylinder, and which at least on one of the meeting area the gripper adjoining section of its circulation can be driven at the peripheral speed of the impression cylinder.
  • the gripper chain can expediently have a plurality of gripper rows spaced apart from one another around the impression cylinder circumference and can be driven at a constant speed corresponding to the circumferential speed of the impression cylinder.
  • Another advantageous measure can consist in that the grippers of the counter-pressure cylinder and the gripper chain can be actuated by assigned curves in such a way that they open or close in the encounter area with mutual delay. This measure results in a high degree of reliability when the products are handed over. These are only released by the impression cylinder when they have already been safely taken over by the gripper chain. It results therefore, there is never a certain lack of leadership in the products, which has an advantageous effect on the achievable design accuracy.
  • the gripper chain can be at least partially underpinned by a conveyor belt adjacent to the counter-pressure cylinder, which conveyor can expediently be driven at a different speed than the peripheral speed of the counter-pressure cylinder.
  • the length of the gripper chain can be advantageously reduced to a minimum.
  • the speed difference can be used to enlarge or reduce the gaps between the successive products or to form a shingled stream.
  • a further, particularly preferred measure can consist in that a support device is provided in the area between the conveyor belt and the impression cylinder adjacent to it. This prevents sagging of the products on the gripper chain side, which are only held on their front edge.
  • the supporting device can expediently have supporting elements arranged next to one another at a distance, for example in the form of stationary guide tongues or rotatably mounted rollers. This ensures that the grippers of the gripper chain can pass freely between the individual support elements, so that they can be positioned so that the products are held in a reliable system on the facing lower run of the gripper chain.
  • a further advantageous measure can consist in the fact that the rear edge of the cylinder pit of the cylinder which transfers the ink to the printing material runs behind the rear edge of the cylinder pit of the impression cylinder more than is necessary to avoid a collision with its grippers. This ensures that wrinkles etc. do not roll out, which can prove to be particularly advantageous when processing multilayer products, since folds are normally present in the region of the fold line in the case of multilayer products.
  • the counter-pressure cylinder is assigned a hold-down device which is effective in the inlet area to the pressure gap and which has a pressure element which can preferably be controlled by means of a cam control.
  • a hold-down device which is effective in the inlet area to the pressure gap and which has a pressure element which can preferably be controlled by means of a cam control.
  • the rubber cylinder can be covered with a film which has a preferably glued-on rubber pad only in the indentation area. This measure prevents unwanted greasing. At the same time, this also makes it easier to control the ink and dampening solution management. In this context, it can also be advantageous to use the effective Adjust the width of the inking unit and the dampening unit to the width of the impression.
  • a further expedient measure can consist in that the impression cylinder is preceded by a stretching device which comes into engagement with the lowest position of the supplied products. This ensures that when processing multilayer products, the underside is also stretched, which further prevents wrinkling and can be used in particular in the production of a perfecting.
  • the single figure of the drawing shows a vertical section through an impression machine according to the invention in a schematic representation.
  • the products indicated at 1 in the drawing which may be rigid or less flexible products, such as thick booklets, cardboard blanks and the like, are to be provided with an impression. Experience has shown that such impressions are not directly on the product edge, but are removed from it.
  • the impression machine 2 provided for producing such impressions contains a sheet-fed rotary offset printing unit with a plate cylinder 3, a rubber cylinder 4 and an impression cylinder 5. These cylinders are provided with cylinder pits 6, 7, 8. In the cylinder pits 6 and 7 of the plate cylinder 3 and the rubber cylinder 4 there are clamping devices 9, 10 for the printing plate 11 and the rubber blanket 12. In the cylinder pit 8 of the impression cylinder 5 is a row of grippers 13 with controlled grippers for holding the front edge of the Products 1 provided.
  • the plate cylinder 3 is supplied by an inking unit 14 with ink and a dampening unit 15 with dampening solution.
  • the impression unit 2 is preceded by a feeder 19 connected via a feed table 18, which is to be designed here as a belt table.
  • a feed table 18 which is to be designed here as a belt table.
  • This can be a so-called cassette feeder, which has a shaft 21 that can be loaded from above and accommodates a stack 20, the bottom of which is designed as a removal belt 22, through which the products 1 can be removed individually and fed to the feed table 18.
  • the side and front marks and pre-grippers or infeed rollers, not shown here, can be provided, from which the grippers of the impression cylinder 5 take over the products 1 and pass through the gap 23 forming the pressure zone between the rubber cylinder 4 and impression cylinder 5 .
  • the plate cylinder 3 and the blanket cylinder 4 have the same effective diameter D.
  • the impression cylinder In normal sheet-fed offset printing presses for printing individual sheets of paper, the impression cylinder also has the same Diameter and lies with its circumference on the rubber cylinder.
  • the circumference of the impression cylinder 5 is so far removed from the circumference of the blanket cylinder 4 that the gap 23 results, the clear width of which corresponds approximately to the thickness of the products 1 or has a slight undersize .
  • the clear width of the gap 23 can expediently be approximately 5% -15% below the thickness of the products. An undersize of 10% has proven to be particularly preferable.
  • the impression cylinder 5 simply has a smaller diameter d than the diameter D of the blanket cylinder 4. This can be achieved when converting a normal sheet-fed rotary offset printing press into an impression machine, for example, by turning the impression cylinder of the normal sheet-fed rotary printing press in accordance with the desired diameter difference. This results in a particularly simple conversion of existing sheet-fed rotary offset printing machines to impression machines according to the invention, since the cylinder bearing can be retained, which also includes certain setting options. But it would also be easily conceivable to make the impression cylinder 5 even more detachable from the blanket cylinder 4 and / or to make the blanket cylinder 4 even more detachable from the impression cylinder 5 while maintaining its position relative to the plate cylinder 3.
  • double eccentric bushes can be provided in the area of the cylinder bearing, as indicated at 33 for the impression cylinder 5.
  • adjustable cylinders an individual adjustment of the size of the gap 23 is possible.
  • there is a fixed column setting but for many Applications in which products of known thickness are processed are sufficient.
  • the grippers of the counter-pressure cylinder-side gripper row 13 project beyond the circumference of the impression cylinder 5 by the thickness of the products 1 with their holding claws which come into engagement with the products 1, so that these are reliably detected.
  • this can be achieved simply by maintaining the grippers present on the impression cylinder in the normal sheet-fed rotary printing press.
  • the products 1 are not guided around the impression cylinder 5 after the printing process, but to one in the running direction of the products next to the Hand over the pressure gap 23 arranged delivery device 34.
  • This contains primarily a gripper chain 35 which is adjacent to the pressure gap 23, with its lower strand approximately at the level of the pressure gap limitation on the rubber cylinder side, ie the pressure gap limitation facing away from the impression cylinder 5, the length of which corresponds to a multiple, here double, of the impression cylinder circumference and the correspondingly several, here has two rows of grippers 36 which are offset with respect to one another around the counterpressure cylinder.
  • the gripper chain 35 is arranged in such a way that the grippers of its gripper rows 36 meet the grippers of the gripper row 13 of the impression cylinder in the area adjacent to the pressure gap 23 5 results.
  • the products 1 are transferred from the counter-pressure cylinder 5 to the gripper chain 35.
  • the grippers of the gripper chain 36 on the gripper chain side then take over engagement with the grippers of the gripper row 13 on the counter-pressure cylinder side.
  • the grippers of the gripper rows 36 reach into the gaps between the grippers of the gripper series 13, the grippers on the counter-pressure cylinder opening and the grippers on the gripper chain side closing.
  • the closing process is expediently carried out before the opening process, which ensures reliable product acceptance.
  • control cams can be provided on the impression cylinder 5 and in the reversal areas of the gripper chain 35. These can be arranged to be adjustable.
  • the gripper chain 35 must run at the circumferential cylinder speed.
  • the gripper chain 35 can be driven at a constant speed corresponding to the peripheral speed of the impression cylinder 5 or rubber cylinder 4.
  • a direct drive connection via spur gears or a chain drive or the like can be provided.
  • the products 1 pass through the pressure gap 23 without any significant bending, ie flat.
  • the feed table 18 and the lower run of the gripper chain 35 are arranged parallel to each other and offset by approximately the clear width of the pressure gap 23.
  • the transport plane of the products 1 passing through the pressure gap 23 is inclined to the horizontal. Accordingly, the feed table 18 and the lower run of the gripper chain 35 show a course inclined to the horizontal.
  • the gripper chain 35 is gripped over part of its length by a conveyor belt 37 adjacent to the impression cylinder 5, the upper run of which has an approximately parallel course to the lower run of the gripper chain 35.
  • the distance between the gripper chain 35 and the conveyor belt 37 is somewhat larger than the thickness of the products 1, so that the products 1 initially held in contact on the lower run of the gripper chain 35 are thrown onto the conveyor belt 37 when the grippers of the gripper rows 36 are opened.
  • control cams cooperating with the gripper rows 36 can be provided in the outer reversal region of the gripper chain 35.
  • the speed of the conveyor belt 37 can correspond to the speed of the gripper chain 35 or be different therefrom. In the illustrated embodiment, the conveyor belt 37 should run slower, so that practically a shingled stream can be achieved.
  • a support device 38 is provided, by means of which the rear areas of the products 1, which are held on their front edges by the grippers of the gripper rows 36, are supported after leaving the pressure gap 23.
  • the support device 38 is arranged in such a way that the products 1 are thrown unhindered onto the conveyor belt 37 when the grippers of the gripper rows 36 are opened can be.
  • support rollers arranged at a distance from one another or, as in the exemplary embodiment shown, simply at a distance from one another, stationary guide tongues can be provided. These support elements are laterally offset from the grippers of the gripper rows 36 so that the grippers can pass through the gaps between the adjacent support elements.
  • the products 1 are pressed against the counter-pressure cylinder 5 by means of a holding-down device 24 arranged in the inlet area to the pressure gap 23.
  • This hold-down device can be out of operation when processing single-layer, rigid cardboard products or the like.
  • the holding-down device 24 can have a spring-loaded pressure plate that extends over the entire length of the cylinder and under which the grippers 4 can pass.
  • the hold-down device 24 is provided with a resilient comb plate 25 forming gaps for the grippers 13. This can be arranged stationary.
  • the comb plate 25 is arranged pivotably and can be brought into and out of hold-down engagement in cycles by means of a cam control 27 cooperating with a spring 26.
  • This cyclical actuation of the hold-down device 24 results in a particularly gentle operation.
  • the products 1, as can be clearly seen in the drawing are not only stripped and attached to the impression cylinder 5 pressed, but at the same time also kept away from the rubber cylinder 4, which eliminates the risk of greasing.
  • the hold-down device 24 also causes the upper layers of the products 1 to be stretched.
  • a stretching device is provided in the area of the feed table 18, which exerts a braking force on the lower layer. Said stretching device can also be passivated when processing single-layer products.
  • blowing nozzles 28, which are inserted into the feed table 18 and which are supplied with compressed air via a supply line 29, are provided for this purpose, contrary to the transport device of the products 1, whereby the hydrodynamic paradox can develop.
  • suction nozzles that can be connected to a vacuum source could of course also be provided.
  • the stretching device is in any case controlled so that the braking force is only effective when the products 1 are transported by the grippers 13.
  • the cylinder pits 7 and 8 of the rubber cylinder 4 and the impression cylinder 5 do not run against one another with their edge edges. Rather, the rubber cylinder 4 runs after the impression cylinder, as indicated by the caster angle N.
  • this caster dimension is larger here than would be absolutely necessary to avoid a collision with the grippers 13 in order to roll out to avoid the products 1 in the area of the edge gripped by the grippers 13.
  • multilayered folding products have certain folds in the folding area, which would be rolled out in the event of the rubber cylinder 4 running too little in relation to the counterpressure cylinder 5.
  • the provided wake ensures an undisturbed escape of the air stripped from the products 1.
  • the caster angle depends on the product thickness, i.e. H. with weaker products, less wake is required than with thicker products.
  • the caster angle can be selected so that the caster of the rear edge of the cylinder pit 7 of the blanket cylinder 4 in relation to the rear edge of the cylinder pit 8 of the impression cylinder 5 is 15 mm to 20 mm. In the illustrated embodiment, this wake should be 20mm. This results in a somewhat later use of pressure. However, this is not disadvantageous because impressions, as mentioned above, do not reach the edge of the product anyway. However, the folds of the fold area are prevented from rolling out even with thicker products.
  • the rubber cylinder 4 is reset by the angle N while maintaining its relation to the plate cylinder 3 with respect to the impression cylinder 5. This can be done while stationary or during operation.
  • the rubber blanket 12 received on the rubber cylinder 4 can correspond to a normal rubber blanket.
  • the effective range is Blanket 12 limited to the indentation area.
  • the rubber blanket 12 consists of a carrier film which has a rubber sticker 12a indicated in the indentation area by a dashed line. With this measure, the risk of greasing can be further reduced. In addition, this has an advantageous effect on the control of the ink and dampening solution supply.
  • the width of the inking unit 14 and the dampening unit 15 is also reduced to the indentation area. It would be conceivable to use correspondingly narrower inking and dampening units compared to the normal inking and dampening units running over the entire length of the cylinder. In the exemplary embodiment shown, this is easily achieved by means of lateral scraper devices in the form of scraper blades which can be set on a ink or dampening solution transfer cylinder. This has the advantage that continuous inking and dampening units can be used over the entire length of the cylinder.
  • an automatic plate change device 31 which is assigned to the plate cylinder 3 and is provided with cassettes 32 for the plates which are used or used one after the other, is provided in the illustrated embodiment.
  • an impression mechanism 31 could be provided, one of which is activated and the other is passivated for the plate change.

Landscapes

  • Rotary Presses (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
EP19910107816 1990-05-23 1991-05-15 Printing machine Withdrawn EP0463343A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904016539 DE4016539A1 (de) 1990-05-23 1990-05-23 Eindruckmaschine
DE4016539 1990-05-23

Publications (2)

Publication Number Publication Date
EP0463343A2 true EP0463343A2 (fr) 1992-01-02
EP0463343A3 EP0463343A3 (en) 1992-04-01

Family

ID=6406988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910107816 Withdrawn EP0463343A3 (en) 1990-05-23 1991-05-15 Printing machine

Country Status (3)

Country Link
EP (1) EP0463343A3 (fr)
JP (1) JPH06198840A (fr)
DE (1) DE4016539A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994026519A2 (fr) * 1993-05-12 1994-11-24 Deritend Engineering Limited Appareil de traitement du carton

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406205A (en) * 1942-12-07 1946-08-20 Davidson Mfg Corp Printing press
FR1335971A (fr) * 1962-10-12 1963-08-23 Color Metal A G Perfectionnements apportés aux dispositifs pour le transfert des feuilles dans les presses d'impression à cylindres multiples
FR2420499A1 (fr) * 1978-03-23 1979-10-19 Ferag Ag Dispositif pour former une ligne derivee continue, a partir d'une ligne principale continue d'articles plats, en particulier d'imprimes
US4589338A (en) * 1984-02-17 1986-05-20 Billy Collins Flexographic plate mounting apparatus and method
DE8409199U1 (fr) * 1984-03-24 1988-07-07 Man Roland Druckmaschinen Ag, 6050 Offenbach, De

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2062504A1 (de) * 1970-12-18 1972-07-06 Schnellpressenfabrik Koenig & Bauer AG, 8700 Würzburg Bogenrotationsdruckmaschine
BE894832A (fr) * 1982-10-27 1983-02-14 Cymaticolor Corp Duplicateur offset en couleurs
JPH0798389B2 (ja) * 1988-07-22 1995-10-25 リョービ株式会社 ２つの印刷ユニットを持つオフセット印刷機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2406205A (en) * 1942-12-07 1946-08-20 Davidson Mfg Corp Printing press
FR1335971A (fr) * 1962-10-12 1963-08-23 Color Metal A G Perfectionnements apportés aux dispositifs pour le transfert des feuilles dans les presses d'impression à cylindres multiples
FR2420499A1 (fr) * 1978-03-23 1979-10-19 Ferag Ag Dispositif pour former une ligne derivee continue, a partir d'une ligne principale continue d'articles plats, en particulier d'imprimes
US4589338A (en) * 1984-02-17 1986-05-20 Billy Collins Flexographic plate mounting apparatus and method
DE8409199U1 (fr) * 1984-03-24 1988-07-07 Man Roland Druckmaschinen Ag, 6050 Offenbach, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994026519A2 (fr) * 1993-05-12 1994-11-24 Deritend Engineering Limited Appareil de traitement du carton
WO1994026519A3 (fr) * 1993-05-12 1995-02-09 Deritend Eng Ltd Appareil de traitement du carton

Also Published As

Publication number Publication date
EP0463343A3 (en) 1992-04-01
DE4016539A1 (de) 1991-11-28
JPH06198840A (ja) 1994-07-19

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