EP0939702A1 - Method and device for conveying sheets - Google Patents
Method and device for conveying sheetsInfo
- Publication number
- EP0939702A1 EP0939702A1 EP97949862A EP97949862A EP0939702A1 EP 0939702 A1 EP0939702 A1 EP 0939702A1 EP 97949862 A EP97949862 A EP 97949862A EP 97949862 A EP97949862 A EP 97949862A EP 0939702 A1 EP0939702 A1 EP 0939702A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- stack
- gripper edge
- feed
- sheets
- 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
Definitions
- the invention relates to a method and a device for transporting sheets in a sheet printing machine.
- the uppermost sheet of a stack of feed sheets is grasped / transported vertically by lifting suction devices placed on the sheet in the rear area / transferred to transport suction devices also placed in the rear area and transported horizontally towards a feed table (DE 363 4659).
- the sheet lying on the feed table is detected by suction belts engaging below it in connection with guide elements arranged above the sheet and conveyed to the feed marks.
- the alignment takes place in and across the sheet running direction (DE 362 2693).
- the sheet is transferred from the conveyor elements to a sheet delivery chain circle and slowed down by suction rollers acting on the sheet and placed on the sheet delivery stack (DEU 800 3052).
- the object of the invention is to provide a method and a device for transporting sheets without markings on the printing surface by means of conveying and / or aligning elements even when the sheet is passed through the printing machine a second time.
- the method for transporting sheets is described using the sheet printing machine shown in FIG. 1.
- the printing machine contains a stack of feed sheets 1 / conveying elements 2, further conveying elements 3 / a sheet-guiding cylinder 4 designed as a printing cylinder, which interacts with two offset cylinders 5 / whereby each offset cylinder is assigned a printing form cylinder 6 with two inking / dampening rollers 7 / additional conveying elements 9 and a delivery sheet stack 11.
- the run of the sheet to be printed 12 (sheet run) from the feeder sheet stack 1 to the delivery sheet stack 11 takes place in later-mentioned process steps / the means acting on the sheet during sheet travel exclusively at the gripper edge 13 of the Attack the bow or act on the gripper edge.
- the gripper edge 13 usually extends from the front edge of the sheet in the direction of the sheet extension over a distance of 3-5 mm.
- sheet transport direction 14 The transfer of the sheets from the sheet guide cylinder 4 to the subsequent additional conveying elements 9 takes place counter to the sheet travel direction 14 / this direction is hereinafter referred to as sheet transport direction 15.
- the stack of feeder sheets and the stack of delivery sheets are arranged in the same stacking plane 30.
- the sheet conveyed from the feed sheet stack 1 to the sheet guide cylinder 4 is printed on the back side of the sheet based on this machine scheme based on the position of the sheet on the feed sheet stack 1, and is placed on the delivery sheet stack 11 with the printed sheet back upward.
- the sheet 12 resting on the feeder sheet stack 1 forms a first plane 16 and the sheet 12 has the gripper edge 13 on its front edge (FIG. 2). Exclusively at this gripper edge 13, the sheet 12 is detected and transpo tiert by the printing press to the stack of delivery sheets.
- the sheet 12 is gripped at the gripper edge 13 / raised to a second level 17 and thus separated from the feeder sheet stack 1.
- the second level 17 lies above a sheet stop 18 fixedly arranged on the front edge of the feeder sheet stack 1 and is almost identical to the oscillating path of the conveying element 2.
- the conveying element 2 carries out a swiveling movement initiated by a cam drive, not shown, transports the sheet 12 via a feed table 19 up to the feed marks 10 of the printing press. At the application marks 10, the sheet 12 is released by the conveying element 2 at a release point 24.
- the lifting and swiveling movement is carried out by two separate elements. The sheet is gripped by a lifting conveyor element at the gripper edge and separated from the stack of feed sheets by a vertical movement. The funding element (2) then takes over the sheet and transports it to the feed marks.
- Alignment means 20 (FIG. 3) aligns the sheet 12 with the application marks 10 arranged transversely to the sheet travel direction 14 and with the side marks 21 arranged laterally on the feed table 19 in the sheet travel direction 14.
- An alignment element 20 for each alignment direction is a pulse element which acts exclusively on the gripper edge 13 on the sheet to be aligned / which is arranged below the feed table 19 and with one above the sheet Roll 22 interacts / uses.
- the pulse element applies intermittent pulses of a significantly higher pulse frequency (200 to 400 heart) relative to the bow clock frequency (5 heart) on the sheet.
- a movement component is applied to the sheet under slip in the direction of the marks; in the impulse breaks there is a force-free relaxation of the bow.
- the aligned sheet 12 on the gripper edge 13 is grasped / accelerated by a further conveying element 3 which is arranged as a pre-gripper and is transferred to the gripper system of the sheet guide cylinder 4.
- the further conveying element 3 is preferably designed as a vibrating suction gripper and driven by a cam drive, not shown.
- the sheet 12 After the sheet 12 has been released from the conveying element 2, it is raised to a third level 23 and moved in the direction of the stack of feed sheets 1. After the conveying element 2, the sheet transfer position described - starting position; Conveyor element is located above the gripper edge 13 - is reached, the same is placed on the feeder sheet stack 1, i.e. lowered to the first level 16 and the separation process begins again.
- the movement sequence of the transport element - lifting and swinging movement - is indicated by arrows in FIG. 2.
- the sheet 12 is transported further through the sheet guide cylinder 4 in a known manner by the gripper systems of the sheet guide cylinder which grip the sheet at the gripper edge.
- the sheet guide cylinder transfers the sheet to the additional conveying element 9, which transports the sheet over the delivery sheet stack while releasing the sheet and releases it there (FIG. 4).
- the additional conveying means 9 is designed as a chain circle 25 with gripper cars 26 guided on a gripper carriage track 27 and connected to the chain circle 25 via a coupling 28. To slow the arc, the chain of the chain circle is guided on a chain track 29 which deviates from the gripper car track 27 and is thereby slowed down.
Landscapes
- Discharge By Other Means (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19644946A DE19644946A1 (en) | 1996-10-29 | 1996-10-29 | Method and device for transporting sheets |
DE19644946 | 1996-10-29 | ||
PCT/DE1997/002523 WO1998018628A1 (en) | 1996-10-29 | 1997-10-28 | Method and device for conveying sheets |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0939702A1 true EP0939702A1 (en) | 1999-09-08 |
EP0939702B1 EP0939702B1 (en) | 2001-02-28 |
Family
ID=7810320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97949862A Expired - Lifetime EP0939702B1 (en) | 1996-10-29 | 1997-10-28 | Method and device for conveying sheets |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0939702B1 (en) |
DE (2) | DE19644946A1 (en) |
WO (1) | WO1998018628A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10129744A1 (en) * | 2001-06-20 | 2003-01-09 | Koenig & Bauer Ag | Method and devices for aligning an arc |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1091581B (en) * | 1958-11-26 | 1960-10-27 | Wilhelm Ritzerfeld | Offset printing machine with a control device for the interaction of the printing elements for line selection |
DE2149151A1 (en) * | 1970-10-29 | 1972-05-10 | Polygraph Leipzig | Sheet delivery device |
US4236709A (en) * | 1979-06-29 | 1980-12-02 | International Business Machines Corporation | Cartridge sheet feed attachment |
DE4219116C2 (en) * | 1992-06-12 | 1995-09-28 | Roland Man Druckmasch | Sheet-fed rotary printing machine for multi-color printing |
DE19612544B4 (en) * | 1996-03-29 | 2004-04-08 | Koenig & Bauer Ag | Device for aligning sheets |
DE19644950A1 (en) * | 1996-05-24 | 1997-11-27 | Kba Planeta Ag | Printing front and rear side of paper sheet |
-
1996
- 1996-10-29 DE DE19644946A patent/DE19644946A1/en not_active Withdrawn
-
1997
- 1997-10-28 EP EP97949862A patent/EP0939702B1/en not_active Expired - Lifetime
- 1997-10-28 DE DE59703079T patent/DE59703079D1/en not_active Expired - Lifetime
- 1997-10-28 WO PCT/DE1997/002523 patent/WO1998018628A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9818628A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0939702B1 (en) | 2001-02-28 |
WO1998018628A1 (en) | 1998-05-07 |
DE19644946A1 (en) | 1998-04-30 |
DE59703079D1 (en) | 2001-04-05 |
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