EP0036937B1 - Bogentransporttrommel in Rotationsdruckmaschinen - Google Patents

Bogentransporttrommel in Rotationsdruckmaschinen Download PDF

Info

Publication number
EP0036937B1
EP0036937B1 EP81101102A EP81101102A EP0036937B1 EP 0036937 B1 EP0036937 B1 EP 0036937B1 EP 81101102 A EP81101102 A EP 81101102A EP 81101102 A EP81101102 A EP 81101102A EP 0036937 B1 EP0036937 B1 EP 0036937B1
Authority
EP
European Patent Office
Prior art keywords
per
sheet transport
warp
transport drum
tex
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
Application number
EP81101102A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0036937A1 (de
Inventor
Earl Thoms
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to AT81101102T priority Critical patent/ATE7674T1/de
Publication of EP0036937A1 publication Critical patent/EP0036937A1/de
Application granted granted Critical
Publication of EP0036937B1 publication Critical patent/EP0036937B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles

Definitions

  • the invention relates to an elevator of a sheet transport drum in the form of a textile covering for preventing the freshly printed underside of the sheet from smearing during the transport of the sheet.
  • a sheet laying drum known from DE-B 1 561 043 is double-walled and has a cover made of porous and air-permeable material. Air is blown into the cavity between the double wall. This emerges through the air-permeable cover and creates an air cushion between the outer surface of the sheet delivery drum and the freshly printed underside of the sheet to be transported. The air cushion prevents the printed image from smearing.
  • the known sheet delivery drum has the disadvantage that it is expensive to manufacture. Large amounts of blown air are required to generate the air cushion. In addition to the cost of the facility itself, there is a high energy requirement. In addition, the indoor climate of the print shop is adversely affected. With the large amount of air required, there is also an undesirable supply of heat to the machine, which can lead to paper warping.
  • the use of this known sheet delivery drum therefore often requires additional cooling and dampening devices for the blown air, which has a cost-increasing effect.
  • an elevator for a sheet transport drum which is designed as a glass bead cloth.
  • the glass beads are e.g. glued on a rubber blanket and form a closed, non-porous surface with the adhesive.
  • the surface of this well-known elevator shows different ink delivery behavior. While the load-bearing glass bead domes willingly return the color they have accepted to the arch, the valleys made of adhesive or rubber solution tend to build up color. The result is that such glass bead cloths have to be washed frequently, the individual glass beads very easily detaching from their adhesive connection. In the long run, glass bead cloths do not show satisfactory results in terms of preventing smearing.
  • the known glass bead cloths can only be used to a limited extent on sheet delivery drums, because when the chain gripper passes from the circular path of the chain wheel into the straight chain track, the transported sheet is forced to have a slightly different speed than the surface speed of the outer surface of the sheet delivery drum. The resulting displacement of the freshly printed underside of the sheet relative to the elevator, namely to the glass bead cloth, causes the printed image to be smeared.
  • DE-B 1 471 728 shows a textile carrier with a smooth surface and fiber inclusions, for example made of nylon, which protrude radially from the carrier material and are arranged symmetrically.
  • These supporting fibers are designed, for example, as loops or loops. They can be subjected to heat treatment in order to achieve greater rigidity.
  • the object of the invention is to provide an elevator for a sheet transport drum which can be produced with little resources and is easy to clamp and which prevents smearing and scratching of the printed image even when the freshly printed underside of the sheet moves relative to the elevator of the sheet transport drum.
  • the elevator should allow trouble-free printing of runs of at least 500,000 prints without a deterioration in the printed image being ascertainable.
  • the elevator should be easy to clean on the sheet transport drum.
  • Dry rubbing is usually sufficient to clean these cloth-like elevators. Color residues that adhere to the tips of the fabric parts protruding from the load-bearing elevator surface can be rubbed off effortlessly. At larger intervals, wet cleaning using the usual rollers and mold detergents is also possible. However, tests have shown that such a wet cleaning of the elevator according to the invention is not necessary under 1,000,000 prints.
  • the effect according to the invention on two supporting processes.
  • the freshly printed underside of the sheet first meets a multitude of resilient support points of the rough surface structure of the textile material, in contrast to the glass beaded cloths, in which the support tips are unyielding in this regard.
  • the flexibility of the supporting points of the textile material inevitably creates an air cushion because the structure of the textile material makes it difficult for the air to escape in any lateral direction.
  • the impression cylinder 1 of the last printing unit of a multicolour sheet-fed offset printing machine transfers the printed sheet 2 to the gripper bridge 3 of a chain delivery 4.
  • a sheet delivery drum 5 provided on the sprocket shaft 6 closest to the impression cylinder 1 guides the sheet 2 during the transfer process its freshly printed sheet side.
  • the gripper bridge 3 transports the transferred sheets 2 to the sheet delivery stack 7.
  • the outer surface 8 of the sheet delivery drum 5 is spanned by an elevator 9, which consists of a textile material with a rough surface structure that is compressible due to the presence of air pockets. It is an elevator made of a brushed, twill cotton (brushed denim material).
  • FIG. 3 illustrates the mode of operation of an elevator according to the invention.
  • the textile-like elevator 9 is compressed slightly due to the tension in the sheet 2. This is caused, among other things, by the fact that the sheet sticks to the rubber cylinder of the last printing unit, not shown, and has to be removed from its surface with the application of a certain force.
  • Firmly nestling the sheet 2 gripped by the gripper bridges 3 onto the elevator 9 does two things. First of all, the freshly printed underside of the arch hugs the resilient supporting parts of the rough surface structure of the elevator material. Due to the tension in the arch mentioned above, these resilient supporting parts of the surface structure of the elevator 9 are pressed in.
  • the fabric-like elevator 9 can be attached to the side walls 10 of the channel 11 of the sheet delivery drum 5 in a simple manner by means of Velcro fasteners 12.
  • Velcro fasteners 12 consist on the one hand of an adhesive film provided with hooks and on the other hand of an adhesive film equipped with eyelets.
  • One of these adhesive films is attached to the material elevator, the other to the wall 10 of the drum channel 11.
  • the elevator 9 is stretched tightly by pressing one of the Velcro fasteners onto the other.
  • the Velcro fastener thus enables the elevator 9 to be clamped and removed in a simple manner by hand. i.e. without the use of tools.
  • the attachment of the ends of the elevator 9 by means of Velcro fasteners can also be carried out on other parts of the wall of the sheet laying drum 5 than just on the side walls 10 of the channel 11. Likewise, there is the possibility of providing a Velcro fastener part on the sheet laying drum 5, on which the textile-like elevator 9 directly is liable.
  • the use of the elevator 9 according to the invention is not limited to the sheet delivery drum. Rather, such elevators 9, as shown in FIG. 5, can also be used in sheet transfer drums.
  • a storage drum 15 transfers the already printed sheet 2 to the sheet transfer drum 16. Since the latter has to transport the sheet 2 on its printed side, it is provided with a textile-like elevator 9 according to the invention.
  • the impression cylinder 17 takes over the sheet 2 from the sheet transfer drum 16 and guides it through the printing gap 18, which is formed between the blanket cylinder 19 and the impression cylinder 17. After printing again, the sheet 2 is taken over by a further sheet transfer drum 20, in which the freshly printed sheet side also comes to rest on the outer surface of the drum. Therefore, it is also provided with an elevator 9 according to the invention.
  • the sheet is fed to the Spei chertrommel 21 passed on. Since this transports the sheet on the non-printed sheet side, it does not require an elevator 9 according to the invention, unless it is a perfecting machine. Because of the smudge-free transport of the sheets, their low manufacturing costs and their simple clamping and cleaning options, textile-type lifts according to the invention can be used with great advantage on all sheet transport drums. A particular advantage is also that the elevator can start right near the start of printing, which is not achievable in all known embodiments of sheet transport drums.
  • the textile material which so far has retained the non-color-smearing and print-protecting properties even with long runs as the most suitable drum winder, was determined as a twill fabric with the K 3 S weave, the warp thread count of 33.4 per cm and the weft thread count of 19 per cm.
  • the yarn count in the warp is 47.4 tex and in the weft 48.1 tex. This corresponds to a converted thread number in the warp of 21.1 and in the weft of 20.8.
  • the number of warp lifts per cm 2 is 158.7.
  • the warp and weft threads are made of pure cotton.
  • the weight per unit area of this textile material is 293 g per m 2 , with a bulk density of 0.314 g per cm 3 and a pore fraction of 79.6 percent by volume.
  • Another textile that has shown very good results has a twill weave with the weave S, whose warp thread count is 50.4 per cm and its weft thread count is 22.7 per cm.
  • the yarn count in the warp is 27.4 tex, which corresponds to a yarn number of 36.5 and in the weft to 43.1 tex, which corresponds to a converted yarn number of 23.2.
  • the number of warp raises is 286 per cm 2.
  • the warp and weft threads are made of pure cotton.
  • the weight per unit area of this textile material is 261 g per m 2 , with a bulk density of 0.381 g / cm 3 and a pore fraction of 79.6 volume percent.
  • Another very suitable material is a twill weave with the bond which, however, has a warp thread count of 32.5 per cm and a weft thread count of 19.4 per cm.
  • the yarn count in the normal state is 47.3 tex corresponding to a yarn number of 21.1 in the warp and 64.1 tex in the weft, which corresponds to a yarn number of 15.6.
  • the number of warp raises amounts to 157.6 per cm 2.
  • the warp and weft threads are made of pure cotton.
  • the weight per unit area of this textile material is 315 g / M 2 , with a bulk density of 0.422 g / cm 3 and a pore fraction of 72.6 percent by volume.
  • the two textiles listed below are less suitable for solving the task and represent actual borderline cases, of which the first dealt with has a very rough profile and the second described has a very smooth working surface.
  • the textile with the largest profile of all the fabric samples listed here is a twill fabric with the weave , which has a warp thread count of 24.7 and a weft thread count of 15.0 per cm.
  • the yarn count in the warp is 94.8 tex, which corresponds to a converted yarn number of 10.5, and the weft 68.6 tex, which corresponds to a converted yarn number of 14.6.
  • the number of warp raises amounts to 92.6, whereby the warp is made of pure cotton, but the weft is made of a mixture of polyester and cotton.
  • the weight per unit area of this textile material is 368 g / m 2.
  • the bulk density is 0.335 g / cm 3 and the pore fraction is 77.7 percent by volume.
  • This very smooth, ie with a low profile, is a cross twill with the binding , which has a warp thread count of 25 and a weft thread count of 14.5 per cm.
  • the yarn count in the warp is 87.7 tex corresponding to the converted yarn number of 11.4 and in the weft 75.2 tex, which corresponds to a converted yarn number of 13.3.
  • the number of warp raises amounts to 90.6 per cm 2 , both warp and weft threads made of pure cotton.
  • the weight per unit area of this textile fabric is 366 g / m 2 .
  • the bulk density is 0.352 g / cm 3 and the pore fraction is 77.1 percent by volume.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP81101102A 1980-03-31 1981-02-17 Bogentransporttrommel in Rotationsdruckmaschinen Expired EP0036937B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101102T ATE7674T1 (de) 1980-03-31 1981-02-17 Bogentransporttrommel in rotationsdruckmaschinen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US13544680A 1980-03-31 1980-03-31
US135446 1980-03-31
US21511780A 1980-12-10 1980-12-10
US215117 1998-12-18

Publications (2)

Publication Number Publication Date
EP0036937A1 EP0036937A1 (de) 1981-10-07
EP0036937B1 true EP0036937B1 (de) 1984-05-30

Family

ID=26833327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101102A Expired EP0036937B1 (de) 1980-03-31 1981-02-17 Bogentransporttrommel in Rotationsdruckmaschinen

Country Status (11)

Country Link
EP (1) EP0036937B1 (da)
JP (1) JPS56151565A (da)
AU (1) AU538331B2 (da)
BE (1) BE887975A (da)
BR (1) BR8101843A (da)
CA (1) CA1154304A (da)
DE (2) DE3163807D1 (da)
DK (1) DK40181A (da)
ES (1) ES267117Y (da)
IT (1) IT1135456B (da)
NO (1) NO811087L (da)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402267A (en) * 1981-03-11 1983-09-06 Printing Research Corporation Method and apparatus for handling printed sheet material
DE3347886A1 (de) * 1983-08-06 1985-05-30 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Abschmierfreie umfuehrtrommel fuer bogenrotationsdruckmaschinen
DE3328451A1 (de) 1983-08-06 1985-02-21 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Abschmierfreie umfuehrtrommel fuer bogentotationsdruckmaschinen
DE3507925A1 (de) * 1985-03-06 1986-09-11 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Bogentransporttrommel fuer rotationsdruckmaschinen
US4691632A (en) * 1986-07-08 1987-09-08 Demoore Howard W Method and apparatus for attaching anti-smear net to printing press transfer cylinder
JPS6323035U (da) * 1986-07-30 1988-02-16
US5042384A (en) * 1990-04-30 1991-08-27 Howard W. DeMoore Anti-marking method and apparatus for use with perfector cylinders of rotary sheet-fed printing presses
DE4204254C2 (de) * 1992-02-13 1995-03-16 Koenig & Bauer Ag Einrichtung zum Längsfalzen mehrerer gleichbreiter Papierbahnen in einer Rollenrotationsdruckmaschine
US5415098A (en) * 1994-01-18 1995-05-16 Ward; Donald A. Method and apparatus for handling sheet material using ridged netting
DE4436583A1 (de) * 1994-10-13 1996-04-18 Heidelberger Druckmasch Ag Vorrichtung zur Qualitätskontrolle von bedrucktem Papier in einer Rotationsdruckmaschine
US5907998A (en) * 1995-12-29 1999-06-01 Howard W. Demoore Anti-static, anti-smearing pre-stretched and pressed flat, precision-cut striped flexible coverings for transfer cylinders
US5979322A (en) * 1996-05-07 1999-11-09 Demoore; Howard Warren Environmentally safe, ink repellent, anti-marking flexible jacket covering having alignment stripes, centering marks and pre-fabricated reinforcement strips for attachment onto transfer cylinders in a printing press
US5842412A (en) * 1997-03-07 1998-12-01 Bba Nonwovens Simpsonville, Inc. Anti-marking covering for printing press transfer cylinder
DE19745763A1 (de) * 1997-10-16 1999-04-22 Heidelberger Druckmasch Ag Transporttrommel in Rotationsdruckmaschinen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126826A (en) * 1964-03-31 Transfer cylinder for rotary multi-color printing presses
US1336995A (en) * 1919-07-31 1920-04-13 Allen B Beck Device for preventing offset in printing-presses
US3308522A (en) * 1962-12-14 1967-03-14 Velcro Corp Anti-offset roll
AT341550B (de) * 1975-05-10 1978-02-10 Heidelberger Druckmasch Ag Bogenuberfuhrtrommel fur druckmaschinen
GB1505623A (en) * 1975-07-11 1978-03-30 Heidelberger Druckmasch Ag Transfer drum and drum blanket for sheet-fed rotary printing presses

Also Published As

Publication number Publication date
DE3105683C2 (de) 1985-03-28
EP0036937A1 (de) 1981-10-07
DE3105683A1 (de) 1982-03-04
ES267117Y (es) 1983-08-16
NO811087L (no) 1981-11-30
AU6793781A (en) 1981-10-08
ES267117U (es) 1983-02-16
JPS56151565A (en) 1981-11-24
AU538331B2 (en) 1984-08-09
DE3163807D1 (en) 1984-07-05
DK40181A (da) 1981-10-01
BR8101843A (pt) 1981-10-06
IT1135456B (it) 1986-08-20
CA1154304A (en) 1983-09-27
IT8119719A0 (it) 1981-02-13
BE887975A (fr) 1981-07-16

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