CN110576676A - Method for operating a turning device of a printing press - Google Patents
Method for operating a turning device of a printing press Download PDFInfo
- Publication number
- CN110576676A CN110576676A CN201910489928.3A CN201910489928A CN110576676A CN 110576676 A CN110576676 A CN 110576676A CN 201910489928 A CN201910489928 A CN 201910489928A CN 110576676 A CN110576676 A CN 110576676A
- Authority
- CN
- China
- Prior art keywords
- tensioning
- suction
- gripper
- sheet
- movement
- 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.)
- Granted
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
- B41F21/04—Grippers
- B41F21/06—Suction-operated grippers
-
- 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
- B41F21/106—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine
- B41F21/108—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine with pneumatic means
Landscapes
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
The invention relates to a method for operating a turning device (1) of a printing press, wherein a sheet (4) is transferred from a storage cylinder (2) having a tensioning suction (5) to a turning cylinder (3) having a gripper (10), wherein the tensioning suction (5) executes a tensioning movement (6) before the sheet (4) is gripped by the gripper (10), wherein the tensioning movement (6) is also executed without interruption at the time when the sheet (4) is already gripped by the gripper (10), and wherein the tensioning movement (6) is stopped after the sheet (4) is lifted off from the tensioning suction (5) by the gripper (10).
Description
Technical Field
The invention relates to a method for operating a turning device of a printing press, wherein a sheet is transferred from a storage cylinder with tensioning suction to a turning cylinder with a clamping gripper, and the tensioning suction performs a tensioning movement before the sheet is gripped by the clamping gripper.
in the turning device, the sheets are held at their rear edges by means of tensioning suction devices, which perform a tensioning movement in order to tension the sheets.
background
DE 2452096C 2 describes a turning device, in which the tensioned suction devices are designed as rotary suction devices and are provided with rubber suction collars. This tensioning movement is then carried out over the entire path traveled between the transfer cylinder and the reversing cylinder as the sheet edge rotates on the storage cylinder.
in this case, it is disadvantageous that the tensioning movement is already stopped at the point in time when the sheet is already gripped by the gripper of the reversing cylinder. This results in a high removal force when the sheet is removed from the rotary vacuum by the gripperDue to such high removal forces, the sheet may slip in the gripper, thereby deteriorating the turnover retention (wendepassserhaltkeit).
disclosure of Invention
The object of the invention is to provide a method with improved turnover register retention.
The object is achieved by a method for operating a turning device of a printing press, wherein a sheet is transferred from a storage cylinder with tensioning suction to a turning cylinder with clamping grippers, and the tensioning suction performs a tensioning movement before the sheet is gripped by the clamping grippers, characterized in that the tensioning movement is performed without interruption at the moment when the sheet is gripped by the clamping grippers, and the tensioning movement is stopped after the sheet is removed from the tensioning suction by the clamping grippers.
At this point in time, these gripper grippers are still closed or preferably completely closed.
The invention is based on the following knowledge: if, during transfer of the sheet from the tensioned suction to the gripper jaw, there is sliding friction between the tensioned suction and the sheet, rather than the static friction (Haftreimbung) of the prior art, the pull-off force can be kept at a low level. By tensioning this sliding friction between the suction and the sheet, it is ensured that: the static friction between the gripper and the sheet is favorable at each of these times: at this point in time, the sheet is still held by the tensioning suction and at the same time by the gripper.
The sheet can no longer slip off of the gripper grippers, since the static friction of the gripper grippers exceeds the sliding friction of the tensioning suction devices. Thereby ensuring good turnover register retentivity.
There are different possible modifications of the method according to the invention:
These tensioning aspirators may be rotary aspirators, wherein the tensioning movement is a rotation. Alternatively, these tensioning aspirators may be moving aspirators, wherein the tensioning movement is a translation. The translation or a component thereof is oriented parallel to the axis of rotation of the storage drum.
these gripper grippers can be clamp grippers, each of which has two pivotable clamping jaws. The gripper jaws, together with the sheet clamped therein, execute an oscillating movement relative to the reversing cylinder. Each of the two clamping jaws is mounted so as to be pivotable relative to the base body of the reversing drum.
These tensioning suctions may each have a suction cup made of rubber. The suction cup may be configured as a rubber suction collar. The rubber may be a rubber elastic plastic.
at the above-mentioned point in time (at which the tensioning movement of the tensioning suction is still being carried out and at the same time the sheet has already been gripped by the gripper), these tensioning suction can still be charged with vacuum. During the time when the sheet is already clamped more or less firmly in the gripper grippers, the sheet is still sucked by the tensioning suction.
Drawings
The improvement also results from the following description of the exemplary embodiments and from the drawings, in which:
FIG. 1: the sheet is transferred from the storage drum to the turning drum at its trailing edge; and
FIG. 2: the trailing edge of the sheet is held by both the tensioning suction of the storage cylinder and the gripper of the reversing cylinder.
Detailed Description
Fig. 1 shows a reversing device 1 of a sheet-fed printing press, which reversing device 1 comprises a storage cylinder 2 and a reversing cylinder 3. The sheet-fed printing press is operated in a front-side and a rear-side printing mode of operation, wherein the sheets 4 are turned over by the turning device 1. The reversing device 1 can be switched to a front-side printing mode without reversing the sheet 4. The storage drum 2 has tensioned suction devices 5, which tensioned suction devices 5 are arranged in an array parallel to the axis of rotation of the storage drum 2.
fig. 2 shows the tensioning suction 5 and the gripper 10 in detail. As shown, the tensioning suction 5 is configured as a rotary suction which performs a tensioning movement 6 for tensioning the sheets 4. The tensioning movement 6 is a rotation about the axis of rotation 7 of the tensioning suction 5. These tensioning suctions 5 are each provided with a suction cup 8 made of rubber, which suction cup 8 is designed as a collar (Manschette). The suction opening or openings 9 of the tensioning suction devices 5 are formed eccentrically with respect to the axis of rotation 7.
the tumble cylinder 3 has gripper grippers 10, which grippers 10 are arranged in an array parallel to the axis of rotation of the tumble cylinder 3. These gripper grippers 10 are configured as pincer grippers having a first jaw 11 and a second jaw 12, respectively. The two clamping jaws 11,12 are mounted so as to be pivotable relative to a base body 13 of the tumble drum 3. These tensioned suctions 5 are connected by a guide system 14 to a suction air generator 15, said suction air generator 15 loading the tensioned suctions 5 with a vacuum which is applied on the suction opening 9.
the situation at such a moment is shown in fig. 1 and 2: at this point in time, the trailing edge of the sheet 4 is held stationary by the gripper 10 and at the same time by the tensioning suction 5 during its transfer from the storage cylinder 2 to the reversing cylinder 3. These gripper grippers 10 sink into the cylinder channel 16 of the storage cylinder 2 and hold the trailing edge of the sheet 4 clamped between the first and second clamping jaws 11, 12. The tensioning suction devices 5 simultaneously hold the sheet 4 at the location near the rear edge and are subjected to vacuum by the suction air generators 15, so that the suction air generators 15 suck the sheet 4 during the tensioning movement 6. In this case, the tensioning suctions 5 each carry out a tensioning movement 6 about an axis of rotation 7.
After the moment shown in the drawing, these rollers 2,3 continue to rotate in the direction of rotation indicated by the arrows. In this case, the gripper grippers 10 are pivoted out of the position shown in the drawing, in which the gripping jaws 11,12 point forward as seen in the direction of rotation of the turnover drum 3, relative to the substrate 13 into a position in which the gripping jaws 11,12 point in the opposite direction (i.e. rearward with reference to the direction of rotation of the turnover drum 3).
after the time shown in the drawing, the sheet 4 is also removed from the tensioning suction 5 by the gripper grippers 10. After the sheet 4 has been removed as described above, the tensioning movement 6 of the tensioning suctions 5 and their vacuum application is terminated. The sheet edge which is the trailing edge before the sheet 4 is transferred from the tensioning suction 5 to the gripper 10 is located in front in the sheet transport direction after this sheet transfer. That is, the turning device 1 operates according to the so-called rear edge turning (hinderkantenwendung) principle.
The tensioning movement 6 of the tensioning suction 5 and the vacuum loading are carried out in the described manner at each sheet 4 to be turned over one after the other.
List of reference numerals
1 turnover device
2 storage roller
3 turnover drum
4 pages
5 tensioning aspirator
6 tensioning movement
7 axis of rotation
8 suction cup
9 suction opening
10 holding gripper
11 first clamping jaw
12 second clamping jaw
13 base body
14 guide system
15 suction air generator
16 roller channel
Claims (5)
1. A method for operating a turning device (1) of a printing press,
Wherein the sheets (4) are transferred from a storage cylinder (2) with a tensioned suction (5) to a turning cylinder (3) with a gripper (10), and
The tensioning suction (5) performs a tensioning movement (6) before the sheet (4) is gripped by the gripper (10),
It is characterized in that the preparation method is characterized in that,
The tensioning movement (6) is implemented in such a way that the sheet (4) is not interrupted yet at the moment when it is gripped by the gripper (10), and
The tensioning movement (6) is not stopped until the sheet (4) is removed from the tensioning suction (5) by the gripper (10).
2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,
It is characterized in that the preparation method is characterized in that,
The tensioning aspirator (5) is a rotary aspirator, wherein the tensioning movement (6) is a rotation.
3. The method according to claim 1 or 2,
it is characterized in that the preparation method is characterized in that,
The gripper (10) is a pincer gripper, which has two pivotable gripping jaws (11,12) each.
4. the method according to any one of claims 1 to 3,
It is characterized in that the preparation method is characterized in that,
the tensioning suction devices (5) each have a suction cup (8) made of rubber.
5. The method according to any one of claims 1 to 4,
It is characterized in that the preparation method is characterized in that,
At the aforementioned time, the tensioned suction means (5) is still loaded with vacuum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018209028 | 2018-06-07 | ||
| DE102018209028.9 | 2018-06-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110576676A true CN110576676A (en) | 2019-12-17 |
| CN110576676B CN110576676B (en) | 2022-09-27 |
Family
ID=68651935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910489928.3A Active CN110576676B (en) | 2018-06-07 | 2019-06-06 | Method for operating a turning device of a printing press |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110576676B (en) |
| DE (1) | DE102019204872A1 (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2452096A1 (en) * | 1974-11-02 | 1975-07-31 | ||
| US4662277A (en) * | 1984-07-20 | 1987-05-05 | M.A.N.-Roland Druckmaschinen Aktiengesellschaft | Rotary printing machine with sheet reversal and transport apparatus |
| CN1245116A (en) * | 1998-05-18 | 2000-02-23 | 海德堡印刷机械股份公司 | Paper suction-operated gripper for turning device of sheet-fed rotary printing machine |
| CN1398722A (en) * | 2001-07-23 | 2003-02-26 | 三菱重工业株式会社 | Paper-transferring printing machine and its middle cylinder |
| CN101177061A (en) * | 2006-11-06 | 2008-05-14 | 海德堡印刷机械股份公司 | Method and apparatus for turning a sheet during its transport through a printing press |
| DE102010001098A1 (en) * | 2009-01-27 | 2010-08-12 | Manroland Ag | Sheet guiding drum for sheet turning system of sheet-fed printing machine, has suction cup including suction side for suction of print sheet, and gripper system provided with sheet gripper and temporarily pivotable in recess |
| CN102292213A (en) * | 2009-01-27 | 2011-12-21 | 曼罗兰公司 | Storage drum assembly and sheetfed printing press equipped therewith |
| DE102011084210A1 (en) * | 2011-10-10 | 2013-04-11 | manroland sheetfed GmbH | Sheet guiding cylinder for sheet printing machine, particularly sheet-fed rotary printing machine, has sheet holding device for processing machine, suction gripper with suction nozzles for fixing sheet material, and pneumatic source |
| DE102012008668A1 (en) * | 2012-04-30 | 2013-10-31 | Heidelberger Druckmaschinen Aktiengesellschaft | Method for conveying paper sheets in sheet-fed printing machine, involves controlling conveyor, and inputting data reproducing alignment of fibers relative to conveyer track into controlling or regulating device |
| DE102013214454A1 (en) * | 2013-07-24 | 2015-01-29 | manroland sheetfed GmbH | Sheet guiding cylinder with a pneumatic sheet holding device |
-
2019
- 2019-04-05 DE DE102019204872.2A patent/DE102019204872A1/en active Pending
- 2019-06-06 CN CN201910489928.3A patent/CN110576676B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2452096A1 (en) * | 1974-11-02 | 1975-07-31 | ||
| US4662277A (en) * | 1984-07-20 | 1987-05-05 | M.A.N.-Roland Druckmaschinen Aktiengesellschaft | Rotary printing machine with sheet reversal and transport apparatus |
| CN1245116A (en) * | 1998-05-18 | 2000-02-23 | 海德堡印刷机械股份公司 | Paper suction-operated gripper for turning device of sheet-fed rotary printing machine |
| CN1398722A (en) * | 2001-07-23 | 2003-02-26 | 三菱重工业株式会社 | Paper-transferring printing machine and its middle cylinder |
| CN101177061A (en) * | 2006-11-06 | 2008-05-14 | 海德堡印刷机械股份公司 | Method and apparatus for turning a sheet during its transport through a printing press |
| DE102010001098A1 (en) * | 2009-01-27 | 2010-08-12 | Manroland Ag | Sheet guiding drum for sheet turning system of sheet-fed printing machine, has suction cup including suction side for suction of print sheet, and gripper system provided with sheet gripper and temporarily pivotable in recess |
| CN102292213A (en) * | 2009-01-27 | 2011-12-21 | 曼罗兰公司 | Storage drum assembly and sheetfed printing press equipped therewith |
| DE102011084210A1 (en) * | 2011-10-10 | 2013-04-11 | manroland sheetfed GmbH | Sheet guiding cylinder for sheet printing machine, particularly sheet-fed rotary printing machine, has sheet holding device for processing machine, suction gripper with suction nozzles for fixing sheet material, and pneumatic source |
| DE102012008668A1 (en) * | 2012-04-30 | 2013-10-31 | Heidelberger Druckmaschinen Aktiengesellschaft | Method for conveying paper sheets in sheet-fed printing machine, involves controlling conveyor, and inputting data reproducing alignment of fibers relative to conveyer track into controlling or regulating device |
| DE102013214454A1 (en) * | 2013-07-24 | 2015-01-29 | manroland sheetfed GmbH | Sheet guiding cylinder with a pneumatic sheet holding device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019204872A1 (en) | 2019-12-12 |
| CN110576676B (en) | 2022-09-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210707 Address after: Weisloch, Germany Applicant after: Heidelberg printing machinery Intellectual Property Co.,Ltd. Address before: Heidelberg, Germany Applicant before: Heidelberger Druckmaschinen AG |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |