WO1990012688A1 - Arrangement for an adjustable sheet turning equipment - Google Patents
Arrangement for an adjustable sheet turning equipment Download PDFInfo
- Publication number
- WO1990012688A1 WO1990012688A1 PCT/SE1990/000283 SE9000283W WO9012688A1 WO 1990012688 A1 WO1990012688 A1 WO 1990012688A1 SE 9000283 W SE9000283 W SE 9000283W WO 9012688 A1 WO9012688 A1 WO 9012688A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- turning
- cylinder
- transfer
- transfer cylinder
- Prior art date
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
- B41F21/106—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine
Definitions
- the present invention refers to an arrangement for an ad ⁇ justable sheet turning equipment in a sheet offset press of unit type for the printing of both sides of a sheet and where said turning equipment includes only one transfer cylinder between the printing units in the sheet offset press.
- sheet offset presses generally only one side of the sheet is printed at a time in a printing process. In single colour presses this is done in one printing unit, in two- or multi ⁇ colour presses in two or more printing units coupled together over one or three transfer cylinders for the transport of the sheet from one unit to the next, so called unit presses. Moreover, there are so called five cylinder presses, where two printing units are working against a common impression cylinder and where the transport of the sheet to the fol- lowing double printing unit is made with gripper bars carried on chains when multicolour printing.
- both sides of the sheet should however be printed and in order to save the turning of the pile of paper and a renewal printing of the other side of the sheet, there are today adjustable presses which either print two or more colours on one side of the sheet or after adjustment print one or more colours also on the other side of the sheet at only one run through the press.
- a two colour sheet offset press it is then possible to either print two colours on one side of the sheet or after adjustment one colour on each side of the sheet* Consequently, in a four colour sheet offset press either four colours can be printed on one side of the sheet or, after adjustment, two colours on each side and so on.
- the turning equipment is engaged.
- ⁇ is installed in or operates against one or more of the transfer cylinders.
- the turning equipment is installed in an extra cylinder before the entrance to the receiving five cylinder unit.
- the gripping of the sheet is changed from the fore edge to the rear edge and the sheet is then trans ⁇ ported with the original rear edge first and thus turned upside down and will in this way be printed in the following unit on the original back side of the sheet.
- the sheet is now printed on both sides at only one run through the press and without extra paper handling.
- the mechanisms which are re ⁇ quired in a .sheet offset press to make it adjustable as mentioned above are however rather complicated and then also expensive to make, they require more maintenance and can also influence the printing quality in negative direction.
- Multicolour presses of unit type and with only one transfer cylinder between the units are available, but with the giving cylinder as impression cylinder in the first unit and with the receiving and turning cylinder as transfer cylinder between the units.
- the object of the present invention is now to make an arrangement with an adjustable turning equipment in a street offset press as mentioned in the introduction by which the disadvantages in the mentioned designs are eliminated.
- the o essential and most important features area stated in the following claims.
- FIG. 1 shows a schematic side view of a preferred design of an adjustable turning equipment according to the invention including a swing gripper which is located above the transfer point in a sheet offset press,
- Fig. 2 shows a schematic side view of a turning equipment according to another design within the present in ⁇ vention including a tumbling gripper arrangement in the impression cylinder in the following printing unit, and
- Fig. 3 shows a schematic side view of a third design of a turning equipment according to the present invention including a shifting gripper arrangement in the impression cylinder in the following printing unit.
- FIG. 1 a schematic side wiew of an ad- justable turning equipment in a sheet offset press of unit type is shown for the printing of both sides of sheet 1.
- This sheet offset press has only one transfer cylinder 2 which is installed between the two after each other following printing units 3.
- the transfer cylinder 2 On the transfer cylinder 2 the sheet 1 is held in a completely stretched condition between the grippers 4 for the firm holding of the fore edge 6 of the sheet 1 and the suc ⁇ tion bar 5 for the location of the rear edge 7 of the sheet 1.
- the suction bar 5 should work with vacuum which through hoses and holes in the transfer cylinder, not shown on the , drawing, is maintained from a vacuum source.
- the mentioned necessary stretching of the sheet 1 between its fore edge 6 and rear edge 7 is made by making the suction bar 5 movable and this stretching is so designed that it can be adjusted for all desired sheet sizes within the press specification.
- the turning of the sheet is made between the giving transfer cylinder 2 and the receiving impression cylinder 8 in the following printing unit 3 over a distance of the surface of the transfer cylinder 2 on its top half segment.
- the turning equipment according to the example il ⁇ lustrated in Fig. 1 includes the swing gripper 11 which is located above the transfer point 12 between the transfer cylinder 2 and the receiving impression cylinder 8.
- FIG. 2 another design of a turning equip ⁇ ment is shown according to the present invention including a tumbling gripper arrangement 13 installed in the receiving impression cylinder 8.
- the purpose of this gripper arrange ⁇ ment is that it shall grip the rear edge 7 of the sheet 1 for turning the sheet 1 in the very transfer point 12 between the giving transfer cylinder 2 and the receiving impression cylinder 8.
- a third design of a turning equip ⁇ ment is shown according to the present invention including a shifting gripper arrangement 14 installed in the receiving impression cylinder 8.
- the purpose of this gripper arrange ⁇ ment is that it shall grip the rear edge 7 of the sheet 1 for turning the sheet 1 in the very transfer point 12 between the giving transfer cylinder 2 and the receiving impression cylinder 8.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69013499T DE69013499T2 (en) | 1989-04-27 | 1990-04-27 | ARRANGEMENT FOR AN ADJUSTABLE BLADE TURNING DEVICE. |
EP90908128A EP0470204B1 (en) | 1989-04-27 | 1990-04-27 | Arrangement for an adjustable sheet turning equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8901543-2 | 1989-04-27 | ||
SE8901543A SE463503B (en) | 1989-04-27 | 1989-04-27 | DEVICE FOR A REPAIRABLE TURNOVER EQUIPMENT IN A BASKET SET |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990012688A1 true WO1990012688A1 (en) | 1990-11-01 |
Family
ID=20375823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1990/000283 WO1990012688A1 (en) | 1989-04-27 | 1990-04-27 | Arrangement for an adjustable sheet turning equipment |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0470204B1 (en) |
JP (1) | JPH04504689A (en) |
DE (1) | DE69013499T2 (en) |
SE (1) | SE463503B (en) |
WO (1) | WO1990012688A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE386856B (en) * | 1971-07-07 | 1976-08-23 | Miller Printing Machinery Co | SHEET FEED ROTATION PRESSURE PRESS |
-
1989
- 1989-04-27 SE SE8901543A patent/SE463503B/en not_active IP Right Cessation
-
1990
- 1990-04-27 JP JP50703790A patent/JPH04504689A/en active Pending
- 1990-04-27 DE DE69013499T patent/DE69013499T2/en not_active Revoked
- 1990-04-27 WO PCT/SE1990/000283 patent/WO1990012688A1/en not_active Application Discontinuation
- 1990-04-27 EP EP90908128A patent/EP0470204B1/en not_active Revoked
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE386856B (en) * | 1971-07-07 | 1976-08-23 | Miller Printing Machinery Co | SHEET FEED ROTATION PRESSURE PRESS |
Also Published As
Publication number | Publication date |
---|---|
EP0470204A1 (en) | 1992-02-12 |
JPH04504689A (en) | 1992-08-20 |
SE8901543D0 (en) | 1989-04-27 |
SE8901543L (en) | 1990-10-28 |
SE463503B (en) | 1990-12-03 |
EP0470204B1 (en) | 1994-10-19 |
DE69013499D1 (en) | 1994-11-24 |
DE69013499T2 (en) | 1995-05-24 |
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