US3720163A - Doctor device for low pressure rotating presses - Google Patents

Doctor device for low pressure rotating presses Download PDF

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Publication number
US3720163A
US3720163A US00156214A US3720163DA US3720163A US 3720163 A US3720163 A US 3720163A US 00156214 A US00156214 A US 00156214A US 3720163D A US3720163D A US 3720163DA US 3720163 A US3720163 A US 3720163A
Authority
US
United States
Prior art keywords
doctor device
doctor
printing
press
pipe
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 - Lifetime
Application number
US00156214A
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English (en)
Inventor
R Frey
A Niedermaier
P Maier
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.)
Schnellpressenfabrik Frankenthal Albert and Cie AG
Original Assignee
Schnellpressenfabrik Frankenthal Albert and Cie 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
Priority claimed from DE19702031680 external-priority patent/DE2031680C/de
Application filed by Schnellpressenfabrik Frankenthal Albert and Cie AG filed Critical Schnellpressenfabrik Frankenthal Albert and Cie AG
Application granted granted Critical
Publication of US3720163A publication Critical patent/US3720163A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1027—Tripping devices

Definitions

  • a doctor device for photogravure printing presses The doctor is pivotably mounted on a non-twistable frame on the printing press so as to be movable to and away from the printing cylinder of the press.
  • a bushing, upon which the doctor device is mounted, is oscillated longitudinally along the axis of the printing cylinder to oscillate the doctor and distribute the wear of the doctor more evenly during operation.
  • the present invention relates to printing presses, and in particular, to a doctor device for low pressure rotating presses used for photogravure printing.
  • the picture to be printed is either engraved or etched into the surface of a form or printing cylinder in the form of a plurality of individual indentations which are filled with colored ink.
  • a doctor device is provided to remove excess ink from the surface of the printing cylinder during operation.
  • the doctor consists of a thin sheet of flexible steel having a ground edge disposed against the surface of the printing cylinder with a predetermined, adjustable pressure.
  • the pressure of the doctor against the surface of the cylinder should remain constant. Otherwise, the colors used during the printing process will mix and the printed picture will be distorted and discolored.
  • the doctor device does not wear evenly during operation because of the plurality of indentations in the surface of the form cylinder. Tiny dust particles which are present in the ink used also cause damage to the thin doctor device. In order to cause the doctor device to wear more evenly during operation of the press, and because excess ink is not removed efficiently when the doctor device is in a stationary position, the doctor device is oscillated longitudinally along the longitudinal axis of the form cylinder during operation of the press.
  • the doctor device is also mounted so that it is pivotable away from the form cylinder. It may thus be cleaned easily.
  • the high quality nature of photogravure printing in which it is possible to print with half-tones, i.e., clear colors of different depths corresponding to the depths of the individual indentations in the surface of the form cylinder, require that efficient operation of the doctor device during printing be maintained.
  • the doctor device is mounted so that it will not twist during movement of the device away from the printing cylinder. This prevents the occurrence of color defects in the prints that are printed, an event which happens often in conventional printing presses, especially those which are wide.
  • the doctor device of the present invention is also mounted so that it is prevented from twisting while it oscillates. This prevents discoloring of the prints while printing.
  • the doctor device of the present inven- 3,7Z0,l03 Patented Mar. 13, 1973 tion is mounted pivotably on lever arms secured to the press on a bushing.
  • the bushing is movable axially, and oscillates on a pipe which is rotatably mounted in the side walls of the press.
  • a non-twistable frame supports the doctor device at both of its ends and ensures that the doctor device cannot twist during the operation of the press.
  • the oscillation of the bushing is produced by a drive means which is disposed through the inside of the bushing.
  • the bushing is rotatable, is coupled to a pivotable arm of a power piston, and is retained on the press against an adjustable abutment.
  • This construction allows the doctor device to be pivoted away from the form cylinder during the maintenance or changing of the cylinder.
  • the angle of incidence of the doctor may be adjusted so that the pressure exerted by the doctor device remains constant.
  • the previously-mentioned abutment is adjustable, and is mounted on a ring segment and supported by the pipe, gear wheels and a threaded spindle. It is therefore possible to adjust the position of the doctor device during the operation of the press.
  • FIG. 1 is a longitudinal, cross-sectional view of a doctor device constructed in accordance with the present invention
  • FIG. 2 is an enlarged, partial perspective and sectional view of an adjustment device constructed in accordance with the present invention for use with the doctor device;
  • FIG. 3 is a perspective view of the doctor device shown in operation with the printing cylinder of the printing press.
  • FIG. 4 is a cross-sectional side view of the doctor device of the present invention, showing it in use during printing.
  • doctor device 1 having holder 2 is mounted adjacent printing cylinder 22 on arms 3 and 4.
  • the arms are mounted on a common bushing 5 which is secured by ball-bearing bushings 6 on pipe 7 which is rotatably mounted in walls 8 and 9 of the press.
  • Bushing 5 is oscillated by cylindrical rod 38 which extends through pipe 7 and is coupled to a bolt 39 disposed through opening 29.
  • Arms 10 and 11 are also mounted on pipe 7 adjacent arms 3 and 4. Arms 3 and 4-, and 10 and 11 are coupled together by bolts 12 and casings 13.
  • the doctor device is pivoted by turning pipe 7 by means of pivot arm 14 afiixed to the pipe.
  • Power piston 15 is coupled to arm 14 and is supported on one wall 8 of the press.
  • Insert 30 having abutment 16 is disposed in one end of pipe 7.
  • the abutment is mounted on ring segment 17 which is pivotably mounted on insert 30 of pipe 7 by pin bearing 18.
  • Ring segment 17 is rigidly atfixed to a gear wheel 19 by bolts, and is movable by gear wheel 20 which engages wheel 19.
  • Gear wheel 20 is mounted on shoulders 8' provided on press wall 8.
  • Thread spindle 22 is also mounted on shoulder 8 of press wall 8.
  • Hand wheel 21 is connected to spindle 22 to actuate lever 23. Due to a relatively large gear reduction, fine adjustment of the angle of incidence of the doctor device is made possible. Due to a relatively large gear reduction, fine adjustment of the angle of incidence of the doctor device is made possible. Due to a relatively large gear reduction, fine adjustment of the angle of incidence of the doctor device is made possible.
  • This adjustment may be made during operation of the press without affecting the pressure force of the doctor device, since holder 2 of the doctor device is pivotably mounted by means of arm 24 on thread spindle 25 which is actuated by lever 27 and power piston 28.
  • the power piston provides the pressure force for the doctor device and maintains the proper angle of incidence.
  • the power piston also guarantees secure engagement of abutment 16 and ring segment 17 even While correcting the angle of incidence.
  • the ball bushings permit easy lateral movement of the doctor device during oscillation.
  • a photogravure printing press including a pivotable doctor device which is reciprocated longitudinally during printing, a twist resistant frame for mounting the doctor device on the printing press, comprising:
  • a second pair of mounting arms rigidly mounted on each end of said bushing, for mounting the doctor device on the printing press, said second pair of mounting arms including a pair of apertures extending therethrough parallel to the longitudinal axis of said bushing;
  • said second pair of mounting arms further comprise cylindrical casings disposed in said apertures, having an opening at one end, and a plurality of ball bearings disposed on the inside surface thereof, for receiving said cylindrical coupling members so that said second pair of mounting arms are movable longitudinally with respect to said pipe and said coupling members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Paper (AREA)
  • Rotary Presses (AREA)
US00156214A 1970-06-26 1971-06-24 Doctor device for low pressure rotating presses Expired - Lifetime US3720163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702031680 DE2031680C (de) 1970-06-26 Rakelvorrichtung an Tiefdruck-Rotationsmaschinen

Publications (1)

Publication Number Publication Date
US3720163A true US3720163A (en) 1973-03-13

Family

ID=5775060

Family Applications (1)

Application Number Title Priority Date Filing Date
US00156214A Expired - Lifetime US3720163A (en) 1970-06-26 1971-06-24 Doctor device for low pressure rotating presses

Country Status (4)

Country Link
US (1) US3720163A (enExample)
CH (1) CH525773A (enExample)
FR (1) FR2095975A5 (enExample)
GB (1) GB1306009A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981238A (en) * 1972-09-27 1976-09-21 European Rotogravure Association Method and apparatus for determining doctor blade position in a rotogravure process
CN114535169A (zh) * 2022-02-22 2022-05-27 武汉东湖学院 一种辊筒防粘附装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981238A (en) * 1972-09-27 1976-09-21 European Rotogravure Association Method and apparatus for determining doctor blade position in a rotogravure process
CN114535169A (zh) * 2022-02-22 2022-05-27 武汉东湖学院 一种辊筒防粘附装置

Also Published As

Publication number Publication date
DE2031680B2 (de) 1972-06-08
GB1306009A (enExample) 1973-02-07
DE2031680A1 (de) 1972-01-20
CH525773A (de) 1972-07-31
FR2095975A5 (enExample) 1972-02-11

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