CA2055586C - Device for the smoothening sheets at the impression cylinder in a sheet-fed rotary printing machine - Google Patents
Device for the smoothening sheets at the impression cylinder in a sheet-fed rotary printing machineInfo
- Publication number
- CA2055586C CA2055586C CA002055586A CA2055586A CA2055586C CA 2055586 C CA2055586 C CA 2055586C CA 002055586 A CA002055586 A CA 002055586A CA 2055586 A CA2055586 A CA 2055586A CA 2055586 C CA2055586 C CA 2055586C
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- jet nozzle
- impression cylinder
- nozzle
- printing machine
- 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.)
- Expired - Fee Related
Links
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
- B41F21/10—Combinations of transfer drums and grippers
- B41F21/102—Combinations of transfer drums and grippers with pneumatic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F25/00—Devices for pressing sheets or webs against cylinders, e.g. for smoothing purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
Landscapes
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Rotary Presses (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
Abstract
The continuation patent application describes a device for the smooth application of sheets (1) to be printed on an impression cylinder (3) in front of the nip (5) in a sheet-fed rotary offset printing machine, whereby there is provided a sword nozzle (8) being directable onto the circumference of the impression cylinder (3) and extending over an essential part of the width of the impression cylinder (3) for pressing down the sheet (1) to be printed through the effect of force of an air stream. This sword nozzle (8), at a distance in front of the nip (5), is mounted so as to be swingable around a pendulum axis (9) being positioned parallel to the axis of the impression cylinder (3) and is connectable with a drive which moves the sword nozzle (8) in running direction of the sheet (1) to be printed forth and back in a swinging manner, in phase with the machine. As compared to the main patent, the sword nozzle (8) has a shape, whereby the ends are offset with respect to a center range in running direction of the sheet, so that a smoothening of the sheet (1) to be printed takes place advancing in the center from the sheet front edge to the sheet trailing edge and from the sheet center to both sides. Preferred is a sword nozzle (8) having the shape of an arrow with its point directed against the running direction of the sheet (1) to be printed.
Description
TITLE: DEVICE FOR SMOOTHENING SHEETS AT THE IMPRESSION
CYLINDER IN A SHEET-FED ROTARY PRINTING MACHINE
The invention relates to a device for smoothening sheets at the impression cylinder in a sheet-fed rotary printing machine.
In consideration of the prior art according to the European Patent No. 0 306 684, a device is described in the main patent, whereby it is the aim that through a charged jet nozzle which is moved in a swinging motion in phase with the machine a sheet to be printed can be applied on the impression cylinder in a secure and close-fitting manner before it enters the nip, and that a print devoid of doubling and smutching can be produced with greater certainty, even at high printing speeds. For this purpose a sword nozzle which extends across an essential part of the width of the impression cylinder, preferably the entire width, is especially suitable. Thereby, a noncontact effect is created on the sheet to be printed for the purpose of smoothening it and securely applying it to the impression cylinder before it enters the nip.
The present invention provides for improved smoothing of sheets as the sheets are applied to an impression cylinder.
According to the present invention, the alr stream emerges from the jet nozzle onto the center of the sheet and advances against the running direction of the sheet, so that through the air stream a smoothening motion takes place, not only in the direction from the sheet front edge to the sheet trailing edge but also from the center to both sides.
This effect can be achieved with a jet nozzle of curved design, so that the air stream emerging from the jet nozzle first reaches the sheet at its front edge and then A
CYLINDER IN A SHEET-FED ROTARY PRINTING MACHINE
The invention relates to a device for smoothening sheets at the impression cylinder in a sheet-fed rotary printing machine.
In consideration of the prior art according to the European Patent No. 0 306 684, a device is described in the main patent, whereby it is the aim that through a charged jet nozzle which is moved in a swinging motion in phase with the machine a sheet to be printed can be applied on the impression cylinder in a secure and close-fitting manner before it enters the nip, and that a print devoid of doubling and smutching can be produced with greater certainty, even at high printing speeds. For this purpose a sword nozzle which extends across an essential part of the width of the impression cylinder, preferably the entire width, is especially suitable. Thereby, a noncontact effect is created on the sheet to be printed for the purpose of smoothening it and securely applying it to the impression cylinder before it enters the nip.
The present invention provides for improved smoothing of sheets as the sheets are applied to an impression cylinder.
According to the present invention, the alr stream emerges from the jet nozzle onto the center of the sheet and advances against the running direction of the sheet, so that through the air stream a smoothening motion takes place, not only in the direction from the sheet front edge to the sheet trailing edge but also from the center to both sides.
This effect can be achieved with a jet nozzle of curved design, so that the air stream emerging from the jet nozzle first reaches the sheet at its front edge and then A
2~55S86 smoothens it toward the trailing edge and toward both sides. In a preferred embodiment, a jet nozzle is provided in the shape of an arrow with its point being directed against the running direction of the sheet.
The jet nozzle is reciprocatingly driven to produce a pendulum movement in timed relationship with the operating cycle of the printing machine.
The invention will be best understood from the following description of the embodiment shown in the accompanying drawings, in which:
Figure 1 is a side view of a printing unit of a sheet-fed rotary offset printing machine;
Figure 2 is an enlarged view of the smoothening nozzle of Figure 1, as viewed in running direction of the sheet to be printed; and Figure 3 is a cross-section according to Line III-III of Figure 2.
In accordance with the arrangement of the main patent, the sheet 1 to be printed received from a preceding printing unit is transferred by a transfer cylinder 2 to the impression cylinder 3 of a successive printing unit.
The sheet grippers 4 grip the sheet 1 to be printed at the tangential point between the transfer cylinder 2 and the impression cylinder 3 and pull it through the nip 5 between the impression cylinder 3 and the rubber blanket cylinder 6. Behind the nip 5 the sheet 1 to be printed is fed to a further transfer cylinder 7 which transfers it to a further printing unit.
In order to achieve applying the sheet 1 to be printed on the circumference of the impression cylinder 3 in a secure and close-fitting manner, a jet nozzle 8, at a certain distance, is directed to the circumference of the ~055~86 impression cylinder 3 in front of the nip 5 and mounted so as to be swingable around a pendulum axis 9, as well as to be connectable with a drive which moves the jet nozzle forth and back in a swinging motion in running direction of the sheet, in phase with the machine. The jet nozzle 8 is designed as a sword nozzle or as a sword consisting of many single nozzles or openings which extend over an essential part of the width of the impression cylinder 3, preferably over its entire width. The angle range within which the jet nozzle 8 swings is adjustable, that is, the angle of attack of the blowing direction with respect to the normal through the pendulum axis 9 to the circumference of the impression cylinder 3 as well as the angle of traverse are adjustable.
When the sword nozzle consists of a number of single nozzles, each nozzle can advantageously be regulated individually. In this embodiment of the invention the sword nozzle 8 is adjustably fastened to a pipe 11 in circumferential direction. The pipe 11 is mounted in the frame 12 of the machine so as to be swingable around its longitudinal axis. For the drive of the pendulum movement a lever drive 13, for instance, is the suitable kind. The sword nozzle 8 is pushed onto the casing of a valve adjustment ring 14 through a tube-shaped sleeve 17, said valve adjustment ring 14 being adjustable by means of a screw 16 with respect to a frame part 15. The valve adjustment ring 14 is guided laterally through a cam 18. A
radially directed connection part 19 for the air pipe not illustrated in the drawings penetrates the casing 17 and, with its inner end, is fastened in the valve adjustment ring 14. The air control for the sword nozzle 8 takes place in that the radial openings in the pipe 11 are being covered by the inner end of the connection part 19 and of the passage in the casing 17 to the sword nozzle 8.
Adjustments, controls and effects correspond with the disclosure in the main patent. In the exemplary A
2~58~
embodiment, the sword nozzle 8 has the shape of an arrow with its point directed against the running direction of the sheet 1, as illustrated in Figure 3, in which a plan view of the arrow-shape of the sword nozzle 8 can be seen.
In place of arrow-shaped sword nozzles, curved ones can also be utilized to apply an air stream on the sheet to be printed before it enters the nip, first in the center of the sheet, then advancing from the sheet front edge to the sheet trailing edge, in order to smoothen the sheet from the front edge to the trailing edge and at the same time from the center to the sides, so that through this noncontact effect the sheet to be printed can be applied to the impression cylinder in a secure and close-fitting manner.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
The jet nozzle is reciprocatingly driven to produce a pendulum movement in timed relationship with the operating cycle of the printing machine.
The invention will be best understood from the following description of the embodiment shown in the accompanying drawings, in which:
Figure 1 is a side view of a printing unit of a sheet-fed rotary offset printing machine;
Figure 2 is an enlarged view of the smoothening nozzle of Figure 1, as viewed in running direction of the sheet to be printed; and Figure 3 is a cross-section according to Line III-III of Figure 2.
In accordance with the arrangement of the main patent, the sheet 1 to be printed received from a preceding printing unit is transferred by a transfer cylinder 2 to the impression cylinder 3 of a successive printing unit.
The sheet grippers 4 grip the sheet 1 to be printed at the tangential point between the transfer cylinder 2 and the impression cylinder 3 and pull it through the nip 5 between the impression cylinder 3 and the rubber blanket cylinder 6. Behind the nip 5 the sheet 1 to be printed is fed to a further transfer cylinder 7 which transfers it to a further printing unit.
In order to achieve applying the sheet 1 to be printed on the circumference of the impression cylinder 3 in a secure and close-fitting manner, a jet nozzle 8, at a certain distance, is directed to the circumference of the ~055~86 impression cylinder 3 in front of the nip 5 and mounted so as to be swingable around a pendulum axis 9, as well as to be connectable with a drive which moves the jet nozzle forth and back in a swinging motion in running direction of the sheet, in phase with the machine. The jet nozzle 8 is designed as a sword nozzle or as a sword consisting of many single nozzles or openings which extend over an essential part of the width of the impression cylinder 3, preferably over its entire width. The angle range within which the jet nozzle 8 swings is adjustable, that is, the angle of attack of the blowing direction with respect to the normal through the pendulum axis 9 to the circumference of the impression cylinder 3 as well as the angle of traverse are adjustable.
When the sword nozzle consists of a number of single nozzles, each nozzle can advantageously be regulated individually. In this embodiment of the invention the sword nozzle 8 is adjustably fastened to a pipe 11 in circumferential direction. The pipe 11 is mounted in the frame 12 of the machine so as to be swingable around its longitudinal axis. For the drive of the pendulum movement a lever drive 13, for instance, is the suitable kind. The sword nozzle 8 is pushed onto the casing of a valve adjustment ring 14 through a tube-shaped sleeve 17, said valve adjustment ring 14 being adjustable by means of a screw 16 with respect to a frame part 15. The valve adjustment ring 14 is guided laterally through a cam 18. A
radially directed connection part 19 for the air pipe not illustrated in the drawings penetrates the casing 17 and, with its inner end, is fastened in the valve adjustment ring 14. The air control for the sword nozzle 8 takes place in that the radial openings in the pipe 11 are being covered by the inner end of the connection part 19 and of the passage in the casing 17 to the sword nozzle 8.
Adjustments, controls and effects correspond with the disclosure in the main patent. In the exemplary A
2~58~
embodiment, the sword nozzle 8 has the shape of an arrow with its point directed against the running direction of the sheet 1, as illustrated in Figure 3, in which a plan view of the arrow-shape of the sword nozzle 8 can be seen.
In place of arrow-shaped sword nozzles, curved ones can also be utilized to apply an air stream on the sheet to be printed before it enters the nip, first in the center of the sheet, then advancing from the sheet front edge to the sheet trailing edge, in order to smoothen the sheet from the front edge to the trailing edge and at the same time from the center to the sides, so that through this noncontact effect the sheet to be printed can be applied to the impression cylinder in a secure and close-fitting manner.
Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Claims (9)
1. Device for smoothly applying a sheet onto an impression cylinder upstream of a printing gap of a sheet-fed rotary offset printing machine, said device comprising:
a jet nozzle arrangement which is elongate and formed with a middle region and offset ends, said middle region and said offset ends directing a force of air against the impression cylinder to smooth a sheet on the impression cylinder beginning with the middle of the sheet, followed by smoothing to the lateral sides of the sheet;
and a drive arrangement for swingingly reciprocating said jet nozzle arrangement in a pendulum manner back and forth along a sheet travel direction of said printing machine and in phase with an operating cycle of the printing machine.
a jet nozzle arrangement which is elongate and formed with a middle region and offset ends, said middle region and said offset ends directing a force of air against the impression cylinder to smooth a sheet on the impression cylinder beginning with the middle of the sheet, followed by smoothing to the lateral sides of the sheet;
and a drive arrangement for swingingly reciprocating said jet nozzle arrangement in a pendulum manner back and forth along a sheet travel direction of said printing machine and in phase with an operating cycle of the printing machine.
2. Device according to claim 1, wherein said jet nozzle arrangement includes a sword nozzle having a curved shape.
3. Device according to claim 1, wherein said jet nozzle arrangement includes a sword nozzle shaped as an arrow with a point thereof directed against the sheet travel direction of the printing machine.
4. Device according to claim 1, 2 or 3, wherein said nozzle arrangement includes a plurality of single nozzles which are individually adjustable.
5. Device for smoothly applying a sheet for printing onto an impression cylinder upstream of a printing gap of a sheet-fed rotary offset printing machine, said device comprising a jet nozzle device having at least one movable jet nozzle which, in certain positions, is directed towards the circumference of the impression cylinder for pressing the sheet by blowing air force against the circumference, and drive means coupled with the jet nozzle device for swingingly reciprocating the jet nozzle device in a travel direction of the sheet during an operating cycle of the printing machine, the jet nozzle device being mounted at a spaced distance upstream from a printing gap and being swingable in a pendular manner about a pendulum axis extending parallel to an axis of the impression cylinder, the jet nozzle device being elongated and being formed with a middle region and ends offset upstream from the middle region in the travel direction of the sheet so that the sheet is smoothed, beginning with the middle thereof, from a leading edge to a trailing edge of the sheet and smoothing from the middle to the lateral sides of the sheet.
6. Sheet-applying device according to claim 5, wherein the jet nozzle device has a sword nozzle having means defining at least one nozzle opening, said last-mentioned means being formed with a bend.
7. Sheet-applying device according to claim 6, wherein said means defining said nozzle opening is formed as an arrowhead having a point facing opposite to the direction of travel of the sheet.
8. Sheet-applying device according to claim 5, wherein the elongated jet nozzle device is formed of a plurality of jet nozzles disposed at locations between said ends of the jet nozzle device.
9. Sheet-applying device according to claim 8, wherein said plurality of jet nozzle are individually controllable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19904039311 DE4039311A1 (en) | 1989-06-24 | 1990-12-10 | System for smoothing sheet against printing press cylinder - uses air nozzle with ends offset from middle part |
| DEP4039311.9 | 1990-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2055586C true CA2055586C (en) | 1995-01-03 |
Family
ID=6419944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002055586A Expired - Fee Related CA2055586C (en) | 1990-12-10 | 1991-11-14 | Device for the smoothening sheets at the impression cylinder in a sheet-fed rotary printing machine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0490087B1 (en) |
| JP (1) | JPH04275150A (en) |
| CN (1) | CN1022554C (en) |
| AT (1) | ATE113533T1 (en) |
| CA (1) | CA2055586C (en) |
| DE (1) | DE59103420D1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19549845B4 (en) * | 1995-06-24 | 2007-07-12 | Heidelberger Druckmaschinen Ag | Device for achieving a perfect support of a printing material in a printing press |
| DE19753137C1 (en) * | 1997-11-29 | 1998-10-15 | Roland Man Druckmasch | Sheet-guide and handler for printing machine |
| DE10000308A1 (en) * | 2000-01-05 | 2001-07-12 | Heidelberger Druckmasch Ag | Air duct system in a sheet-fed press |
| JP2008156123A (en) * | 2006-12-21 | 2008-07-10 | Heidelberger Druckmas Ag | Device for feeding sheet toward machine for processing sheet |
| CN106629193B (en) * | 2016-11-18 | 2018-01-23 | 无锡祁龙胶粘制品有限公司 | A kind of diaphragm winding flattening device |
| CN111244557A (en) * | 2020-03-20 | 2020-06-05 | 东莞市科雷明斯智能科技有限公司 | A clamping leveling method and blowing leveling device for lithium battery production |
| CN114103429A (en) * | 2020-08-26 | 2022-03-01 | 北京华夏视科技术股份有限公司 | Paper flattening mechanism of printing machine |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3650043A (en) * | 1970-04-03 | 1972-03-21 | Overly Inc | Web stabilizer |
| DE2603483B2 (en) * | 1976-01-30 | 1978-06-08 | Reinhard Mohn Ohg, 4830 Guetersloh | Method for guiding a sheet for simultaneous printing with a perfecting printing and device for carrying out the method |
| JPS55102373A (en) * | 1979-02-01 | 1980-08-05 | Nippon Carbide Ind Co Ltd | Preparation of artificial fish egg |
| DD241397A1 (en) * | 1985-09-30 | 1986-12-10 | Polygraph Leipzig | BLADE DEVICE IN PRINTING MACHINES |
| JP2628647B2 (en) * | 1987-06-08 | 1997-07-09 | デュプロ精工株式会社 | Stencil locking device for stencil printing machine |
| ATE74554T1 (en) * | 1987-09-11 | 1992-04-15 | Roland Man Druckmasch | DEVICE IN MULTICOLOR SHEET-FED ROTARY PRESSES FOR PRESSING A SHEET ON THE PRINTING CYLINDER. |
| DD264651B5 (en) * | 1987-10-29 | 1993-11-04 | Kba Planeta Ag | DEVICE FOR LUBRICATING BOW GUIDANCE |
| DE3920730A1 (en) * | 1989-06-24 | 1991-01-10 | Heidelberger Druckmasch Ag | DEVICE FOR ARC SMOOTHING ON THE PRINT CYLINDER IN AN ARC ROTATION PRINTING MACHINE |
-
1991
- 1991-11-11 AT AT91119118T patent/ATE113533T1/en not_active IP Right Cessation
- 1991-11-11 DE DE59103420T patent/DE59103420D1/en not_active Expired - Fee Related
- 1991-11-11 EP EP91119118A patent/EP0490087B1/en not_active Expired - Lifetime
- 1991-11-14 CA CA002055586A patent/CA2055586C/en not_active Expired - Fee Related
- 1991-12-09 JP JP3324140A patent/JPH04275150A/en active Pending
- 1991-12-10 CN CN91111504A patent/CN1022554C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59103420D1 (en) | 1994-12-08 |
| EP0490087A1 (en) | 1992-06-17 |
| EP0490087B1 (en) | 1994-11-02 |
| ATE113533T1 (en) | 1994-11-15 |
| JPH04275150A (en) | 1992-09-30 |
| CN1062318A (en) | 1992-07-01 |
| CN1022554C (en) | 1993-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |