Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
  • B41F31/15—Devices for moving vibrator-rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F31/00—Inking arrangements or devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F33/00—Indicating, counting, warning, control or safety devices
  • B41F33/04—Tripping devices or stop-motions
  • B41F33/10—Tripping devices or stop-motions for starting or stopping operation of damping or inking units
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
  • B41P2233/00—Arrangements for the operation of printing presses
  • B41P2233/10—Starting-up the machine
  • B41P2233/11—Pre-inking

Definitions

• the invention relates to methods for operating an inking unit according to the preamble of claim 1 or 2
• An inking unit is known, for example, from WO 98/51500 A1.
• This inking unit has two inking rollers with which ink can be transferred from a central roller to a forme cylinder independently of one another.
• the ink is removed from the central roller by means of an inking roller and transferred to the forme cylinder
• two inking rollers are available in the inking roller train, which also take ink from the central roller and transfer it to the inking roller via a rider roller.
• the forme cylinder which carries the printing plates, can be attached to a blanket cylinder, for example a blanket cylinder in order in this way to print a web of printing material running along the blanket cylinder in offset printing
• the various rollers of the inking unit, the forme cylinder and the blanket cylinder are brought into contact with one another and then accelerated together.
• the ink application device is started, for example by switching on an ink pump
• the inking unit, the forme cylinder and the printing blanket cylinder are then inked, with the printing material web on the printing blanket cylinder decreasing in color at the same time which must then be disposed of as waste
• DE 101 11 363 A1 describes a printing unit for the flying plate change, an inking unit optionally being set on one or the other plate cylinder.
• DE 40 13740 C2 discloses a printing unit in which plate cylinders and blanket cylinders are separated for pre-inking.
• the inking rollers are preferably placed on the plate cylinder to run in the ink, but can also be temporarily changed.
• DE 101 29 555 A1 describes a method for controlling a printing press to reduce duplication, in which the sequence of the cylinder activation and deactivation is defined.
• the invention has for its object to provide methods for operating an inking unit.
• the newly proposed method is based on the basic idea that the various rollers to be inked when the printing machine is started up are inked in steps.
• a phase of pre-inking is proposed during which at least the rollers of the inking unit are inked with printing ink without the printing ink being conveyed further to the printing material web via the blanket cylinder.
• the forme cylinder of the printing unit is pre-inked from
• Blanket cylinder switched off so that the printing ink cannot be conveyed beyond the forme cylinder.
• the rollers of the inking unit are driven in rotation and pre-inked by ink application using the ink application device.
• the forme cylinder is also pre-inked with the rollers of the inking unit.
• the forme cylinder is not in contact with the rollers of the inking unit during certain phases of pre-inking or during the entire pre-inking of the inking unit.
• At least two phases are provided during the pre-coloring.
• the inking rollers of the inking unit which transfer the ink from the inking unit to the forme cylinder, are turned off by the forme cylinder, so that in this first phase only the rollers of the inking unit itself are pre-inked.
• the inking rollers of the inking unit are then set against the forme cylinder and pre-inked at synchronous speed by transferring the ink from the inking rollers.
• the rollers of the inking unit and the forme cylinder are adequately supplied with printing ink.
• the printing blanket cylinder To start up the printing press, it is necessary to accelerate the printing blanket cylinder to a synchronous speed with the forme cylinder after the pre-inking, the speed being selected so that the peripheral speed of the printing blanket cylinder corresponds to the peripheral speed of the forme cylinder.
• the blanket cylinder is then brought into engagement with the form cylinder so that the printing ink can be transferred from the form cylinder to the blanket cylinder.
• the rollers of the inking unit or the forme cylinder should rotate about 20 to 150 revolutions during the pre-inking. This number of revolutions is usually sufficient to form a sufficient ink film on the rollers of the inking unit or the forme cylinder.
• rollers of the inking unit or the forme cylinder can be accelerated to a pre-inking speed.
• This pre-inking speed can preferably be selected such that it corresponds to the speed of the rollers of the inking unit at 150 to 250 revolutions / min. corresponds in particular to approximately 180 to 200 revolutions / min.
• the rollers of the inking unit and the forme cylinder are braked from the pre-inking speed to the setting speed before the synchronously rotating blanket cylinder is placed against the forme cylinder.
• the rollers of the inking unit, the plate cylinder and the blanket cylinder can then be accelerated together to the intended printing speed.
• Fig. 1 is a side view of a schematically illustrated inking unit
• Fig. 2 shows the speed profile of various rollers and cylinders of the inking unit shown in Fig. 1 during pre-inking.
• An inking unit 01 e.g. B. a short inking unit 01 for a rotary printing press, consists essentially of an ink application device 03 which delivers an ink application to an ink pickup roller 02 (hereinafter referred to as central roller 02 or roller 02).
• rollers 12 With the central roller 02 there are one or more rollers 12; 13, e.g. B. inking rollers 12; 13 in touch.
• the paint application device 03 can, for. B. from a known doctor blade 03 but also consist of several rollers in contact with each other, their ink application z. B. received from a conventional paint box or a pump or a paint spraying device, etc.
• One or more inking rollers can be provided.
• rollers of other designs can also be used.
• the ceramic or glass jacket can also be rasterized or have a surface structure produced in another way.
• With the inking rollers 12; 13 and each of the inking roller 16; 17 is a first roller 29 or 31, z. B. a first anilox roller 29 or 31 in contact with its oleophilic jacket.
• the ink rollers 16; 17 can be turned on and off the roller 02. It is sufficient to roll 12; 13; 16; 17; 29; 31 and possibly further rollers provided by means of friction. But they can also be driven in other ways, e.g. B. by electric drives. They can each be adjusted to their adjacent rollers or in addition to roller 02, in order to be able to influence the width of the ink transfer strip.
• the upper rollers 12; 29; 16 form a first inking roller 20.
• the lower inking rollers 13; 31; 17 form a second inking roller train 25.
• These two inking roller trains 20; 25 are each from the central roller 02 via the first inking rollers 16; 17 and additionally via the inking rollers 12; 13 fed with printing ink.
• rollers 12; 29; 16 of the first inking roller train 20 are jointly arranged to be pivotable about the axis of rotation 10 of the roller 02.
• rollers 13; 31; 17 of the second inking roller train 25 are arranged jointly pivotable about the axis of rotation 10 of the roller 02.
• rollers 12; 29; 16, 13; 31; 17 both inking rollers 20; 25 are pivoted so far about the axis of rotation 10 from their working position A away from the forme cylinder 11 that they can come from an approximately horizontal position into an almost vertical position. They can be moved independently of one another and usefully one after the other.
• the ink application device 03 must be removed from the inking unit 01 before the swiveling process is initiated. This creates space for temporary access to the rollers 12; 29; 16 of the first inking roller train 20 or the rollers 13; 31; 17 of the second inking roller train 25.
• the diameter of the central roller 02 can be the same, larger or smaller than the diameter of the rollers 12; 29; 16 or 13; 31; Be 17. It corresponds to a non-integer multiple of the aforementioned rollers 12; 13; 16; 17; 29; 31.
• the aforementioned rollers 12; 13; 16; 17; 29; 31 can all have different diameters.
• a blanket cylinder 60 which in particular can be designed in the manner of a blanket cylinder 60, can be placed on the circumference of the forme cylinder 11. In this way, the print image can be transferred from the forme cylinder 11 to the blanket cylinder 60.
• the blanket cylinder 60 in turn can come to rest on a printing material web, for example a paper web, which is not shown in FIG. 1, in order in this way to transfer the printed image to the printing material web.
• the procedure for pre-inking the inking unit 01 shown in FIG. 1 is explained below using the speed profile shown in FIG. 2.
• the forme cylinder 11 is removed from the inking rollers 12; 13 turned off so that no printing ink D or E from the inking rollers 12; 13 can be transferred to the forme cylinder 11.
• the blanket cylinder 60 is turned off by the forme cylinder 11.
• the various rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 accelerated together. Whether on the different rollers 02; 12; 13; 16; 17; 29; 31 and cylinders 11 of the inking unit 01 individual drives are provided or the drive movement is transmitted by friction is basically irrelevant. 2, the speed of the rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 represented by the peripheral speed of the inking roller 12.
• the ink application device 03 is put into operation at time ti in order to print ink D or E from the
• the individual drive of the forme cylinder 11 is started and this is linearly accelerated to a peripheral speed which corresponds to the pre-inking speed Vi.
• the forme cylinder 11 has reached the pre-inking speed Mi and thus with a synchronous peripheral speed relative to the inking rollers 12; 13 rotates, the forme cylinder 11 at the time t 2 to the inking rollers 12; 13 turned on, so that the printing ink D or E from the inking rollers 12; 13 is transferred to the forme cylinder 11 to pre-ink it.
• rollers 02 rotate; 12; 13; 16; 17; 29; 31 of the inking unit 01 and the forme cylinder 11 together for a short time at the pre-inking speed V , whereby the forme cylinder 11 rotates about 20 to 150 revolutions during this synchronous operation at pre-inking speed M ⁇ .
• the forme cylinder 11 and the rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 jointly braked from the pre-inking speed V- to a setting speed V 2 .
• the blanket cylinder 60 is accelerated to the setting speed V 2 by the individual drive provided for this purpose.
• the blanket cylinder 60 and the forme cylinder 11 rotate at a synchronous peripheral speed of, for example, 6 m / min, the blanket cylinder 60 is placed against the forme cylinder 11 at the time fe, so that a printing material web running over the blanket cylinder 60 is printed.
• the rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01, the forme cylinder 11 and the blanket cylinder 60 accelerated together to the desired printing speed. From that point on - the printing material web is then printed with sufficient quality.
• the pre-inking speed Vi results from a speed of the forme cylinder 11 of 6000 to 14000 U / h, in particular 8000 to 12000 U / h and / or is 6000 to 14000 m / h, in particular 8000 to 12000 m / h.
• the setting speed (V 2 ) is lower than the pre-coloring speed (Vi) and corresponds to Om / min or 4 to 8m / min, in particular approximately 6m / min.
• the form cylinder 11 and the blanket cylinder 60 After the form cylinder 11 and the blanket cylinder 60 have been turned on, they are accelerated to a production speed, the production speed being higher than the setting speed.
• the inking unit 01 is rotated by its own motor and has no positive connection to the forme cylinder 11.
• Forme cylinder 11 and blanket cylinder 60 are each driven by their own position-controlled motors; these cylinders are not in a form-fitting drive connection for the rotary drive.

Landscapes

• Inking, Control Or Cleaning Of Printing Machines (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=33559769

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (8)

• 2003
  • 2003-07-01 DE DE10329427A patent/DE10329427B4/de not_active Expired - Fee Related
• 2004
  • 2004-05-18 ES ES04733573T patent/ES2318289T3/es not_active Expired - Lifetime
  • 2004-05-18 AT AT04733573T patent/ATE423004T1/de not_active IP Right Cessation
  • 2004-05-18 WO PCT/EP2004/050832 patent/WO2005002856A1/fr not_active Ceased
  • 2004-05-18 DE DE502004009014T patent/DE502004009014D1/de not_active Expired - Lifetime
  • 2004-05-18 EP EP04733573A patent/EP1638773B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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