GB2168306A - Printing-machine sheet reversing device - Google Patents
Printing-machine sheet reversing device Download PDFInfo
- Publication number
- GB2168306A GB2168306A GB08529617A GB8529617A GB2168306A GB 2168306 A GB2168306 A GB 2168306A GB 08529617 A GB08529617 A GB 08529617A GB 8529617 A GB8529617 A GB 8529617A GB 2168306 A GB2168306 A GB 2168306A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chain system
- sheet
- printing
- section
- accordance
- 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
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H15/00—Overturning articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/30—Orientation, displacement, position of the handled material
- B65H2301/33—Modifying, selecting, changing orientation
- B65H2301/332—Turning, overturning
- B65H2301/3321—Turning, overturning kinetic therefor
- B65H2301/33212—Turning, overturning kinetic therefor about an axis parallel to the direction of displacement of material
Abstract
Two adjacent units 6,7 of a small offset printing machine are linked by a chain system 8 equipped with gripper bridges. The chain system transports the sheet, which has been printed at least once, from one printing unit to the other. The chain system consists of two endless conveyor chains, tapes or belts, which are running parallel. The chain system is wound like a Mobius tape, which means that the sheet transported e.g. on run 11 is turned around its longitudinal axis. This sheet reversing device allows the use of similar printing masters because the sheet is not flicked over (as in conventional units) but simply reversed. The chain system 8 may be mounted for pivotting about bearing 12 whereby the twisted run of the chain system is on the top run. Sheets transported on the straight lower run are therefore turned over and can be printed at unit 7 with a different colour from that in unit 6. <IMAGE>
Description
SPECIFICATION
Printing-machine sheet-reversing device
This invention relates to a sheet reversing device suitable for use with small offset printing machines.
In spite of their simple design and construction, modern small offset printing machines have achieved a high level of automation Pre-selection of print runs, as well as the automatic loading of masters, are only two examples of offset automation. This high degree of automation makes small offset printing machines especially suitable for the economical printing of very small jobs of various kinds. An additional feature of modern small offset printing machines is that, because of their relatively simple operation and maintenance, they can be operated by semi-skilled personnel.
To an increasing degree, customers demand that paper and postage costs should be saved by printing both sides of a sheet. Academic theses may be named as just one example of such very small printing jobs. The successive printing of both sides of a sheet using one and the same single-colour offset printing machine, however, is time-consuming and therefore costly. In such cases, the advantage of the high level of automation of such small offset printing machines is no longer fully exploited.
If one were to equip two-colour small offset printing machines with sheet reversing devices of the type used with normal offset machines, the cost would be disproportionately high when compared with the simplicity of small offset printing machines. Additionally, semi-skilled rsonnel would hardly be able to carry out the re-setting of such reversing units, which requires great expertise and care.
It is an object of the present invention to provide a sheet-reversing device which is simple in design and construction, and which can without difficulty be operated by semi-skilled personnel, the sheet reversing device matching the level of automation of modern small offset printing machines.
According to the present invention, there is provided a printing-machine sheet-reversing device, wherein: a chain system equipped with gripper bridges links two adjacent printing units, and (in use) transports a sheet which has been printed at least once from one unit to the other; and a chain system comprising two endless conveyor chain running parallel is wound in a Mdbius band configuration, one section of the chain system, running between pairs of sprocket wheels, being twisted, and the opposite section thereof being straight, whereby (in use) a sheet transported by the first-mentioned section of the chain system is turned about its longitudinal axis during its transportation.
It is not essential, however, to use chains as the means of traction or transport; the use of tapes or belts (e.g. toothed belts) is also possible.
A particular advantage is offered by the fact that the two printing units may be run with similar masters, because the sheet is only turned about its longitudinal axis.
Even with very small printing jobs, the customer often requires a second colour to be printed, as a decoration colour. This is possible if the device of the present invention is designed in such a way that the chain system can be swivelled through 180"C from one of two working positions to another so that, for back-up operation, the "Mobius band" twisted section of the chain system can be brought into an operative position, and, for multicolour printing, the straight section of the cahin system is brought into an operative position. The swivelling of the conveyor chain system can be carried out without difficulty by semi-skilled personnel. The chain system gripper bridges preferably have clamshell gripper components.
One embodiment of the invention will be described below with reference to the accompanying diagrammatic drawings, in which:
Figure 1 is a side view showing a small offset printing machine which can be changed over from two-colour printing to back-up, and
Figures 2-5 are diagrams showing alternative positions of the chain system of the printing machine shown in Figure 1, Figures 2 and 4 being side views, Figures 3 and 5 being views from below,
Figures 2 and 3 relating to the case in which the "Möbius band" (or "Mobius tape") twisted section of the chain system is in an operative position and
Figures 4 and 5 relating to the case in which the straight section thereof is in an operative position.
The two small offset printing units 6 and 7 shown in Figure 1 are linked with each other by a chain system 8 consisting of two endless conveyor chains which run parallel. This chain system 8 carries the sheets from the first small offset printing unit 6 to the second small offset printing unit 7.
Between the two small offset printing units 6 and 7, a bearing column 9 is located which carries the side panels (not shown) of the chain system 8.
These side panels are located in bearing 12 and can be swivelled into two working positions in such a way that either section 10 or section 11 of the chain system 8 is placed in the lower sheet conveying position.
As shown in Figures 2 - 5, the chain system 8 is equipped with five gripper bridges 1 - 5. The two conveyor chains of chain system 8 are guided by the chain sprockets 13 and 14.
The grippers (not shown in detail) of gripper carriages 1 - 5 should be symmetrical, e.g. of clamshell type.
As can be seen from Figure 2, the upper section 10 runs straight, whereas the lower section 11 is twisted in the form of a "Möbius tape"which means that the gripper bridges 1 - 5 are rotated through 180 between the chain sprockets 13 and 14.
Figure 3 illustrates the rotation of gripper carriages 1 -5 when traversing the lower section 11.
Example: after having traversed the entire section 11 and arrived at the position of gripper bridge 3, the point marked by a cross 21 on gripper bridge 1 will have assumed the position marked at the top right-hand corner of the figure. Each gripper bridge (in this case gripper bridge 2) will be absolutely vertical in the centre of section 11. As soon as this gripper bridge reaches the chain sprockets 14 and the position of gripper bridge 3, it will have assumed a perfectly horizontal position again after a rotation through 1803. If the gripper bridge 1 - 5 is carrying a sheet while traversing section 11, this sheet is rotated along its longitudinal axis and thus turned over.
As mentioned above, the chain system 8 can be swivelled in its bearing 12 through 1800 placing the "normal" section 10 in the lower sheet conveying position. This indexing position is shown in details in Figures 4 and 5. Both these figures show that the chain sprockets 13 and 14 have changed places. The gripper bridges 4 and 5, which are in the lower section 10, will be conveyed without rotation from chain sprockets 14 to chain sprockets 13. The marking cross 23 (Figure 5) placed on gripper bridges 4 and 5 illustrates that no rotation of the gripper bridges or turning over of the sheet takes place because this marker 23 runs on a path parallel to the chains.
In accordance with the invention the chain system 8 functions as follows Sheet-feeder 18 feeds successive sheets from feed stack 17 to the printing cylinder 15. After the first printing operation the chain system 8 accepts this sheet and transports it along section 11. As shown in Figures 2 and 3, the sheet is rotated around its longitudinal axis before being fed to the printing cylinder 16 of the second small offset printing unit 7. The rotated sheet is printed on its blank reverse side by the small offset printing unit 7 and then conveyed by the chain delivery unit 19 to the delivery stack 20.
For two-colour printing, chain system 8 has to be swivelled around the pivot bearing 12 in such way that section 10 is placed in the lower sheet conveying position. The sheet which has been printed once by printing cylinder 15 is now transported by chain system 8 along section 10 without being rotated along its longitudinal axis. This sheet is then printed on the same side by printing cylinder 16 of the second small offset printing unit 7 and finally fed to the delivery stack 20 by chain delivery unit 19.
Depending on the indexing position of chain system 8, the small offset printing machine shown in
Figure 1 is able to print two colours or a single colour on the front and reverse sides of a sheet in a single operation. The construction of chain system 8 and its bearing unit can be very simple. The same applies to the indexing mechanism which is not shown in the drawings.
The invention is not limited to the construction described herein. Thus the chain system 8 may, for instance, be fixed. In this case, section 11 (the "Mobius band" or "Möbius tape" section) would be permanently in the lower sheet conveying position. It is also possible to use other means of traction instead of the chains, e.g. toothed belts.
Furthermore, chain system 8 may in accordance with the invention be designed in such a way that it can be used temporarily for linking of two complete small offset printing machines. It will be understood, in fact, that the invention has been described above purely by way of example, and that various modifications of detail can be made within the ambit of the invention.
Parts List
1 Gripper bridges
2 Gripper bridges
3 Gripper bridges
4 Gripper bridges
5 Gripper Bridges
6 Small offset printing unit
7 Small offset printing unit
8 Chain system
9 Bearing column
10 Section
11 Section
12 Bearing
13 Chain sprockets
14 Chain sprockets
15 Printing cylinder
16 Printing cylinder
17 Feed stack
18
19 Chain delivery unit
20 Delivery stack
21 Marking cross
22
23 Marking cross
Claims (6)
1. A printing-machine sheet-reversing device, wherein:
a chain system equipped with gripper bridges links two adjacent printing units, and (in use) transports a sheet which has been printed at ast once from one unit to the other; and a chain system comprising two endless conveyor chains running parallel is wound in a Mijbius band configuration, one section of the chain system, running between pairs of sprocket wheels, being twisted, and the opposite section thereof being straight, whereby (in use) a sheet transported by the first-mentioned section of the chain system is turned about its longitudinal axis during its transportation.
2. A device in accordance with claim 1, wherein:
the chain system is so mounted that it can be swivelled through 1800 fm one of two working positions to another, whereby, with back-up operation of the printing machine, the " Möbius band" twisted section of the chain system can be brought into an operative position, and, with multi-colour printing, the straight section of the chain system can be brought into an operative position.
3. A device in accordance with claim 1 or 2, wherein the gripper bridges of the chain system have clamshell gripper components.
4. A device in accordance with claim 1, substantially as described with reference to the accompanying drawings.
5. A device in accordance with claim 1, 2, 3 or 4, modified in that the endless conveyor chains specified are replaced by tapes or belts.
6. A device in accordance with claim 5, wherein the endless conveyor chains are replaced by toothed belts.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843444848 DE3444848A1 (en) | 1984-12-08 | 1984-12-08 | ARC TURNING DEVICE FOR SMALL OFFSET MACHINES |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8529617D0 GB8529617D0 (en) | 1986-01-08 |
| GB2168306A true GB2168306A (en) | 1986-06-18 |
| GB2168306B GB2168306B (en) | 1988-07-13 |
Family
ID=6252262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08529617A Expired GB2168306B (en) | 1984-12-08 | 1985-12-02 | Printing-machine sheet-transporting device |
Country Status (3)
| Country | Link |
|---|---|
| JP (2) | JPS61140443A (en) |
| DE (1) | DE3444848A1 (en) |
| GB (1) | GB2168306B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3503368A1 (en) * | 1985-02-01 | 1986-08-07 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | BOW TURNERS FOR SMALL OFFSET MACHINES |
| US5170390A (en) * | 1988-08-22 | 1992-12-08 | Sharp Kabushiki Kaisha | Optical recording element and driving system |
| US5835469A (en) * | 1990-05-25 | 1998-11-10 | Hitachi, Ltd. | High-density information recording/reproducing method |
| DE19503619A1 (en) * | 1995-02-03 | 1996-08-08 | Heidelberger Druckmasch Ag | Satellite sheet printing press units |
| DE19505877C2 (en) * | 1995-02-21 | 2003-05-28 | Heidelberger Druckmasch Ag | Sheetfed |
| DE19527264A1 (en) * | 1995-07-26 | 1997-01-30 | Heidelberger Druckmasch Ag | Printing machine with straight substrate guide and turning devices for it |
| WO1997045267A1 (en) * | 1996-05-29 | 1997-12-04 | Heidelberger Druckmaschinen Aktiengesellschaft | Sheet conveyer for a rotary press |
| ATE308477T1 (en) | 2000-05-18 | 2005-11-15 | Eastman Kodak Co | TURNING DEVICE |
| DE102008045437A1 (en) * | 2008-09-02 | 2010-03-04 | Heidelberger Druckmaschinen Ag | Sheet reverting device for use in printing machine, has two gripper systems, where conveying path of one gripper system at forward-moving edge is larger than conveying path of other gripper system at over-running edge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB895627A (en) * | ||||
| GB818684A (en) * | 1956-01-20 | 1959-08-19 | Kurt Koerber | Improvements pertaining to the production of tipped mouthpiece or like cigarettes orlike smoking articles |
| US3726386A (en) * | 1971-04-09 | 1973-04-10 | Dow Chemical Co | Doubled loop inverting and conveying apparatus |
| GB2056397A (en) * | 1979-05-22 | 1981-03-18 | Molins Ltd | Conveyor system for twisting stream of rod-like articles |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3987722A (en) * | 1974-12-30 | 1976-10-26 | Addressograph Multigraph Corporation | Dual printing with single master supply source |
| US4226324A (en) * | 1978-05-08 | 1980-10-07 | Bell & Howell Company | Article turnover assembly |
| JPS5917012A (en) * | 1982-07-21 | 1984-01-28 | 株式会社ト−プラ | Screw with flange |
| JPS59102749A (en) * | 1982-11-30 | 1984-06-13 | Toshiba Corp | Paper sheet reversing device |
-
1984
- 1984-12-08 DE DE19843444848 patent/DE3444848A1/en active Granted
-
1985
- 1985-12-02 GB GB08529617A patent/GB2168306B/en not_active Expired
- 1985-12-06 JP JP60273574A patent/JPS61140443A/en active Pending
-
1991
- 1991-06-28 JP JP1991057968U patent/JPH0497752U/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB895627A (en) * | ||||
| GB818684A (en) * | 1956-01-20 | 1959-08-19 | Kurt Koerber | Improvements pertaining to the production of tipped mouthpiece or like cigarettes orlike smoking articles |
| US3726386A (en) * | 1971-04-09 | 1973-04-10 | Dow Chemical Co | Doubled loop inverting and conveying apparatus |
| GB2056397A (en) * | 1979-05-22 | 1981-03-18 | Molins Ltd | Conveyor system for twisting stream of rod-like articles |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8529617D0 (en) | 1986-01-08 |
| DE3444848C2 (en) | 1987-10-08 |
| GB2168306B (en) | 1988-07-13 |
| JPH0497752U (en) | 1992-08-24 |
| DE3444848A1 (en) | 1986-06-12 |
| JPS61140443A (en) | 1986-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921202 |