CN114012277B - Recto-verso printing machine with laser for cutting sheets - Google Patents
Recto-verso printing machine with laser for cutting sheets Download PDFInfo
- Publication number
- CN114012277B CN114012277B CN202110589481.4A CN202110589481A CN114012277B CN 114012277 B CN114012277 B CN 114012277B CN 202110589481 A CN202110589481 A CN 202110589481A CN 114012277 B CN114012277 B CN 114012277B
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- CN
- China
- Prior art keywords
- sheet
- strip
- printing press
- preparation
- laser
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/54—Auxiliary folding, cutting, collecting or depositing of sheets or webs
- B41F13/56—Folding or cutting
- B41F13/58—Folding or cutting lengthwise
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The invention relates to a printing machine for recto-verso printing, comprising a laser (9) for cutting a sheet on a cylinder (8) which supports a pad (11) for recto-verso printing. A strip (25) is arranged on the pad (11) for protecting the pad from the laser (9).
Description
Technical Field
The invention relates to a printing press for recto-verso printing, comprising a laser for cutting a sheet on a cylinder carrying a pad (Aufzug) for recto-verso printing.
Background
DE 2614941 a1 describes a longitudinal separating device which is provided with a rotating drum. In order to protect the drum circumference from damage caused by the gas laser beam of the longitudinal separation device, the drum circumference is provided with a gap extending around the drum circumference.
DE 102005043676 a1 describes a printing press in which a so-called master plate for a reversing operation is fitted on the printing cylinder, which master plate has a significantly more sensitive surface than the chrome-plated cylinder. To protect the print cylinder, the laser focus may be defocused outside of the print specification.
Disclosure of Invention
The object of the invention is to provide a printing press with a simple protective device for protecting the blanket against damage caused by the laser.
This object is achieved by a printing press for recto-verso printing, comprising a laser for cutting a sheet on a cylinder carrying a liner for recto-verso printing, characterized in that a Band (Band) is arranged on the liner for protecting the liner from the laser.
The printing press according to the invention is also suitable for retrofitting due to its simplicity. In the case of such a retrofit, it is not necessary to introduce a circumferential gap corresponding to the state of the art (DE 2614941 a1) into the drum at which the laser is directed.
An additional advantage of the invention is that the position of the strip can be changed from one print job to another depending on the cutting line. For example, the strip may be arranged centrally in one print job and eccentrically in another print job. However, the invention also includes such variants: in this variant, the position of the strip is not changeable.
Different embodiments of the printing press according to the invention are possible:
the strips may comprise aluminium and/or copper.
A suction device for sucking gas or smoke generated at the time of cutting may be provided.
The suction device can be combined with a blowing device for pressing the sheet onto the drum.
A sensor may be provided for monitoring the correct position of the strip. For example, the sensor may be a camera.
Preferably, the sensor detects the position of a feeler (Taster) which is used to sense the strip. The feeler can be used to touch the strip through the sheet.
A guide device for guiding the sheet during the cutting of the sheet can be provided, wherein the guide device functions as a feeler in a versatile manner.
A guide device for guiding the sheet during the cutting of the sheet can be provided, wherein the sensor is combined with the guide device.
A calibration device for setting the guide device to the sheet thickness can be provided. The calibration means may for example comprise an adjusting screw.
Drawings
Further embodiments that are advantageous structurally and functionally emerge from the following description of an exemplary embodiment and the accompanying drawings, in which:
figure 1 is a schematic overview of a double-sided printing press,
figure 2 is a detailed side view of a sheet transport cylinder of a perfecting press,
FIG. 3 is a front view of a sheet transport cylinder, an
Fig. 4 is a partial view of a laser cutting device associated with the sheet transport cylinder.
Detailed Description
A sheet printing press for recto-verso printing comprising: printing units 1, 2 for printing the front side of the sheet B and printing units 3, 4 for printing the rear side. A reversing device 6 is provided between the front side printing units 1, 2 and the back side printing units 3, 4, and the reversing device 6 reverses the sheet B. The sheet B can be paper, cardboard, foil or a composite material, preferably a thin printing substrate. The sheet B, which is conveyed through the machine in the direction R from the feeder 5 to the receiver 7, is placed with its reverse side on a roller 8, which roller 8 is arranged after the turning device 6 in the direction R. The drum 8 is arranged directly before the collector 7.
A laser 9 directed towards the cylinder 8 serves as a longitudinal separating device and cuts the sheet B passing over the cylinder 8 (for example by means of an intermediate cut) into two equally sized portions. Instead of dividing the sheet B, it is also possible to provide the sheet B with only perforations or scratches by means of the laser 9.
A blowing device 24 is provided for pneumatically pressing the sheet B against the drum 8. The blowing device 24 can be configured as a blowing tube and have a nozzle arrangement. Furthermore, a suction device 23 is provided for sucking combustion gas (so-called cutting smoke) generated at the time of cutting.
In order to allow no printing ink to smear onto the cylinder 8 from the side of the sheet B that is just printed and is facing the cylinder 8, at least one pad 11,12 having an anti-smudging effect is arranged on the cylinder 8, which anti-smudging effect is caused by the material (e.g. silicone) and the (e.g. rough) surface structure of the pad 11, 12. The pads 11,12 may be rough or provided with a rough coating having properties that repel printing ink.
The cylinder 8 is a double-sized cylinder with two sheet-receiving surfaces, which are formed by a liner 11 and a further such liner 12. The two pads 11,12 are held in holding means 13, 14 diametrically opposite each other. The surface of each pad 11,12 is very sensitive and is thus protected from the beam 21 of the laser 9 by the strip 25. The strip 25 is arranged in the target area of the laser 9 (in the example shown, centred as seen along the axis of rotation 10 of the drum 8). The laser 9 and thus the strip 25 can also be placed in an off-center manner, for example to divide the sheet B into two portions of different width by means of longitudinal cutting. The ends of the strip 25 are held in these holding means 13, 14 or in additional holding means. Two strips 25 are provided, one strip 25 for each pad 11, 12.
A common strip may also be provided around which the two pads 11,12 are wound. This common strip will cover one of the two roller channels 15, 16 in which the holding means 13, 14 of the pads 11,12 are located. If the roller 8 is a single size roller, there is again only a single band.
The or each strip 25 is composed of a material comprising aluminium and/or copper, for example of substantially pure aluminium or of substantially pure copper or of an aluminium alloy or of a copper alloy. The thickness of the strip 25 is less than one millimeter, preferably only a few micrometers.
In order to secure the strip 25, a sensor 17 is provided, which sensor 17 measures the distance between the sensor 17 and the mechanical feeler 18. The feeler 18 rests on the sheet B in the region of a strip 25, which strip 25 is located between the pad 11 and the sheet B. For this purpose, feeler 18 can be equipped with one or two feeler rollers (tasrollen) or with one or two sliders (Gleitschuhen) for feeler. In the example shown, two feeler rollers are provided, which are located on a guide 19 for guiding the sheet B, the guide 19 forming a functional unit with the feeler 18. The guide device 19 serves to press the sheet B. The contact force of the feeler 18 and the guide 19 on the sheet B is generated by a pretensioned spring 26 and is set to a height according to the thickness of the sheet B by a calibrating device 20 in the form of a stop bolt.
An opening 22 is provided in the guide 19, through which opening 22 the beam 21 of the laser 9 passes during cutting. The cut part of the sheet B is fastened to the cylinder 8 by the guide 19 until it is transferred from the cylinder 8 to the receiver 7. If a damaged, torn sheet B is transported past the guide 19 and the feeler 18, the spring structure of the guide 19 and the feeler 18 switches these elements.
The sensor 17 and the feeler 18 are used to monitor the presence of the strip 25 and to monitor its correct position. If the strip 25 is released from its correct position and slips, the thickness measured in the measuring area decreases. In the case of a correctly positioned strip 25, the total thickness, which is achieved by the sum of the strip thickness and the sheet thickness, is detected by the sensor 17, and only the sheet thickness is detected when the strip 25 slips. The sensor 17 is connected to a controller which stops the printer when the sensor 17 signals to the controller that the strip 25 is not properly in place.
List of reference numerals
1 printing mechanism
2 printing mechanism
3 printing mechanism
4 printing mechanism
5 feeder
6 turning device
7 material collector
8 cylinder
9 laser
10 axis of rotation
11 liner
12 liner
13 holding device
14 holding device
15 roller channel
16 roller channel
17 sensor
18 feeler
19 guide device
20 calibration device
21 beam
22 opening
23 suction device
24 blowing device
25 strips
26 spring
B page
R direction
Claims (10)
1. A printing press for recto-verso printing, comprising a laser (9) for cutting a sheet (B) on a cylinder (8) carrying pads (11,12) for recto-verso printing,
it is characterized in that the preparation method is characterized in that,
a strip (25) is arranged on the pad (11,12) for protecting the pad from the laser (9).
2. The printing press as set forth in claim 1,
it is characterized in that the preparation method is characterized in that,
the strip (25) comprises aluminium and/or copper.
3. A printing press according to claim 1 or 2,
it is characterized in that the preparation method is characterized in that,
a suction device (23) is provided for sucking away gas or smoke generated during the cutting.
4. The printing press as set forth in claim 3,
it is characterized in that the preparation method is characterized in that,
the suction device (23) is combined with a blowing device (24) for pressing the sheet (B) onto the drum (8).
5. A printing press according to claim 1 or 2,
it is characterized in that the preparation method is characterized in that,
a sensor (17) is provided for monitoring the correct position of the strip (25).
6. A printing press according to claim 5, wherein,
it is characterized in that the preparation method is characterized in that,
the sensor (17) detects the position of a feeler (18) for sensing the strip (25).
7. The printing press as set forth in claim 6,
it is characterized in that the preparation method is characterized in that,
the feeler (18) strikes the strip (25) through the sheet (B).
8. A printing press according to claim 6 or 7,
it is characterized in that the preparation method is characterized in that,
in order to guide the sheets (B) during their cutting, a guide device (19) is provided which functions in a multifunctional manner as the feeler (18).
9. A printing press according to claim 5, wherein,
it is characterized in that the preparation method is characterized in that,
in order to guide the sheets (B) during their cutting, a guide device (19) is provided, with which the sensor (17) is combined.
10. A printing press according to claim 8, wherein,
it is characterized in that the preparation method is characterized in that,
a calibration device (20) is provided for adjusting the guide device (19) to the thickness of the sheet (B).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020208881.0 | 2020-07-16 | ||
| DE102020208881.0A DE102020208881B3 (en) | 2020-07-16 | 2020-07-16 | Printing machine for perfecting with a laser for cutting sheets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114012277A CN114012277A (en) | 2022-02-08 |
| CN114012277B true CN114012277B (en) | 2022-07-12 |
Family
ID=75485977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110589481.4A Active CN114012277B (en) | 2020-07-16 | 2021-05-28 | Recto-verso printing machine with laser for cutting sheets |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114012277B (en) |
| DE (1) | DE102020208881B3 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2614941A1 (en) * | 1975-06-23 | 1977-01-20 | Polygraph Leipzig | Slitting arrangement for paper sheet machines - uses gas laser having discharge tube and number of slitting lenses |
| WO2005092618A1 (en) * | 2004-03-29 | 2005-10-06 | Goss International Montataire Sa | Packing sleeve for a printing unit cylinder of an offset printing press |
| DE102005043676A1 (en) * | 2005-09-03 | 2007-03-22 | Man Roland Druckmaschinen Ag | Process to cut paper web into single sheets in a sheet-fed rotary press using dynamically-regulated laser beam |
| EP1872946A2 (en) * | 2006-06-29 | 2008-01-02 | MAN Roland Druckmaschinen AG | Sheet guiding cylinder with a cover in a processing machine |
| DE102010039505A1 (en) * | 2010-08-19 | 2012-02-23 | Manroland Ag | Processing machine e.g. offset printing machine, for processing sheet, has lifting parts connected with sheet holding unit at sheet guide cylinder, where side edge of lifting parts is arranged on side edge of support over format width |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10245322A1 (en) * | 2002-09-27 | 2004-04-08 | Man Roland Druckmaschinen Ag | Process for cross cutting a web |
| US20070196770A1 (en) * | 2006-02-22 | 2007-08-23 | David Recchia | Printing sleeve and method of manufacturing the same |
| US9902146B2 (en) * | 2013-01-29 | 2018-02-27 | Gerald J. Gartner and Teresa Ann Gartner, or their successors | System and method for aligning, mounting and recording alignment of a mounted printing plate |
-
2020
- 2020-07-16 DE DE102020208881.0A patent/DE102020208881B3/en active Active
-
2021
- 2021-05-28 CN CN202110589481.4A patent/CN114012277B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2614941A1 (en) * | 1975-06-23 | 1977-01-20 | Polygraph Leipzig | Slitting arrangement for paper sheet machines - uses gas laser having discharge tube and number of slitting lenses |
| WO2005092618A1 (en) * | 2004-03-29 | 2005-10-06 | Goss International Montataire Sa | Packing sleeve for a printing unit cylinder of an offset printing press |
| DE102005043676A1 (en) * | 2005-09-03 | 2007-03-22 | Man Roland Druckmaschinen Ag | Process to cut paper web into single sheets in a sheet-fed rotary press using dynamically-regulated laser beam |
| EP1872946A2 (en) * | 2006-06-29 | 2008-01-02 | MAN Roland Druckmaschinen AG | Sheet guiding cylinder with a cover in a processing machine |
| DE102010039505A1 (en) * | 2010-08-19 | 2012-02-23 | Manroland Ag | Processing machine e.g. offset printing machine, for processing sheet, has lifting parts connected with sheet holding unit at sheet guide cylinder, where side edge of lifting parts is arranged on side edge of support over format width |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020208881B3 (en) | 2021-05-06 |
| CN114012277A (en) | 2022-02-08 |
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