EP0328369A1 - Vorrichtung zum Reinigen des Gummituches einer Druckerpresse - Google Patents

Vorrichtung zum Reinigen des Gummituches einer Druckerpresse Download PDF

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Publication number
EP0328369A1
EP0328369A1 EP89301211A EP89301211A EP0328369A1 EP 0328369 A1 EP0328369 A1 EP 0328369A1 EP 89301211 A EP89301211 A EP 89301211A EP 89301211 A EP89301211 A EP 89301211A EP 0328369 A1 EP0328369 A1 EP 0328369A1
Authority
EP
European Patent Office
Prior art keywords
blanket
blanket cylinder
housing
brush
vacuum
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
Application number
EP89301211A
Other languages
English (en)
French (fr)
Other versions
EP0328369B1 (de
Inventor
Charles R. Gasparrini
Carl Arnolds
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.)
Baldwin Technology Corp
Original Assignee
Baldwin Technology Corp
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 Baldwin Technology Corp filed Critical Baldwin Technology Corp
Publication of EP0328369A1 publication Critical patent/EP0328369A1/de
Application granted granted Critical
Publication of EP0328369B1 publication Critical patent/EP0328369B1/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
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/06—Cleaning arrangements or devices for offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/23—Brushes

Definitions

  • This invention relates to cleaning apparatus for printing presses and, in particular, to a dry vacuum apparatus for cleaning a blanket cylinder in an offset printing press without interrupting or slowing the operation of the press.
  • Offset printing in comparison with the letterpress method of printing, has become the predominant printing method in the newspaper publishing industry. This is due in part to the increased sharpness of the printed images and the ability to print on less even surfaces than are required by the letterpress method. Also, another important factor in the popularity of offset printing is the lower cost of the printing plates used with offset presses.
  • Offset printing presses typically employ a blanket cylinder, that is to say, a rubber cylinder or a rubber-covered cylinder, for the purposes of receiving inked images from a printing plate.
  • the inked images are then offset onto paper passed between the blanket cylinders or an impression cylinder.
  • Continuous printing is made possible by wrapping a printing plate or a plurality of printing plates around the surface of a plate cylinder designed for rotation in contact with the blanket cylinder.
  • a web of paper passes between two blanket cylinders mounted such that one blanket cylinder serves as an impression cylinder for the other, resulting in simultaneous printing on both sides of the web of paper.
  • Continuous offset printing is adversely affected by dust and lint from the web of paper which tend to accumulate on the blanket cylinder(s). This dust and lint reduces the quality of the printed product.
  • the accumulation of dust, lint or ink on a blanket cylinder thus presents a serious annoyance and necessitates undesirable down-time for cleaning.
  • the problem is especially acute in the newspaper industry, when, in response to the rising cost of newsprint stock, less expensive grades of paper having higher lint content often are substituted for more expensive grades.
  • Previously known vacuum devices for cleaning blanket cylinders involved wet vacuum systems for removing debris. In these systems, segments of the blanket cylinder are continually immersed and cleaned with a solvent. The excess solvent is then removed by a wiper with a vacuum header adjacent the wiper blade. See, for example, U.S. Pat. No. 3,835,779 to Ross et al.
  • the present invention avoids the need for solvents by employing a completely dry system for removing debris and, unlike previous dry systems, no lint catcher is needed or used.
  • an object of the present invention to provide an apparatus for cleaning a blanket cylinder during the course of a press run without interrupting press operation or causing waste during the run. This permits a sharper reproduction for a printed product and incurs less down-time. It also permits the use of grades of paper stock having higher lint contents.
  • Another object of the present invention is to provide an apparatus suitable for integral construction with an offset press, or for manufacture as an add-on device capable of being retrofitted to an existing press.
  • a further object of this invention is to provide an improved vacuum blanket cleaner adapted for automatic operation at a frequency of engagement adjustable by a press operator.
  • Another object of this invention is to provide an improved vacuum blanket cleaner which will not abrade the blanket cylinder.
  • Another object of this invention is to provide an improved vacuum blanket cleaner which promotes longer blanket life.
  • Yet another object of this invention is to provide an improved vacuum blanket cleaner which may be operated without causing waste of materials.
  • Still another object of this invention is to provide an improved vacuum blanket cleaner which operates to provide a longer plate life.
  • an apparatus for cleaning a blanket cylinder of an offset printing press during operation of the press having a brush and a brush holder which are periodically urged against the blanket cylinder by the motion of a pivoting arm connecting the brush with an air cylinder.
  • the action of the brush in combination with rotation of the blanket cylinder is such as to loosen dust and lint from the blanket cylinder.
  • the dust and lint is then drawn into a vacuum system which includes a housing that surrounds the brushes.
  • These brushes may also be segmented to allow portions of the brushes to be disengaged when not needed. Alternatively, where segmenting is not feasible, the brushes may be made laterally adjustable so that it aligns with webs of varying dimensions.
  • the frequency of the automatic engagement and operation of the blanket cleaner of this invention is adjustable by a press operator in response to various anticipated or observed operating parameters such as the length of the press run and the lint content of the paper stock.
  • the invention further including means in the housing adapted to engage the blanket cylinder and serves the dual functional of loosening dirt and lint and sealing the vacuum system.
  • the blanket cleaner shown generally at 20, includes a brush assembly 22 made up of at least one brush 24 and a vacuum means (not shown).
  • the blanket cleaner in accordance with this embodiment of the present invention is mounted in operative association with a blanket cylinder 28, generally parallel to a longitudinal axis of the blanket cylinder.
  • Blanket cleaner mounting brackets 30 are attached to the press frame (not shown) generally outside either end of blanket cylinder 28.
  • Pivoting arms 34 connect the blanket cleaner 20 with mounting brackets 30. These pivoting arms 34 serve to carry the blanket cleaner 20 and are pivotal about pin 36.
  • the blanket cleaner is generally pivotal between two operative positions. Pivoting of said arms 34 between these positions is affected by a plurality of actuators 38 attached to pivot arms 34.
  • the actuator employed is a pneumatic actuator, although electrical or hydraulic actuators can be used if desired. Conventionally, compressed air is used because it is commonly is available in the press rooms, while electrical or fluid sources are not.
  • blanket cleaner 20 In the first operative position, blanket cleaner 20 is biased away from blanket cylinder 28 to facilitate, for example, replacement of the brushes, repair or maintenance of the machine and/or changing of the web.
  • the blanket cleaner 20 In the second operative position, the blanket cleaner 20 is held in contact with the surface of the blanket cylinder 28. In this second position, the blanket cleaner can affect cleaning and removal of the lint and debris from the blanket cylinder.
  • the vacuum portion of one embodiment of blanket cleaner 20 is generally comprised of substantially U-shaped housing 40 extending along the length of the blanket cylinder and a brush assembly 22.
  • the brush assembly 22 is mounted inside housing 40 which in turn is mounted to pivot arms 34.
  • the housing 40 includes brushes 24 retained in brush holder 25, which brush holder is removably mounted to the housing 40 in any convenient manner and can be easily replaced as required. Brushes 24 can be mounted in pairs as shown and have a relatively long life. However, continual operation will require replacement and maintenance of the brushes.
  • brush holder 62 is segmented to allow individual sections to be lifted so as not to contact the blanket cylinder during cleaning. Segmenting can be desirable since newspaper blanket cylinders are generally set up in quarters or pages; i.e, a web can be double width (full blanket) or single width (half blanket). If a single width is used, ink can get onto the cylinder that does not have the web covering it. when that occurs, ink can foul the continuous brushes in the non-web area. Segmenting the brushes, preferably into four sections, permits the brushes in the unused area to be lifted away.
  • lifting is accomplished by manually moving lever 64 of lifting assembly 65 into the down position. This acts to lift guide rod 66 attached to brush holder 62 and bias that section of the brush holder away from the blanket cylinder.
  • the brush assembly may be segmented into as many sections as desired to provide for maximum versatility. Generally, segmenting the brush assembly into four sections covers most operations. Also, lifting may be accomplished by an effective means and can be done either manually, as shown, or by automatic or semi-automatic means.
  • the brush assembly can be made laterally adjustable along the width of the blanket cylinder. (See FIG. 6)
  • brush holder 68 is slideably mounted within housing 70 along slots 72.
  • Locking means 74 serve to maintain the brushes in the desired lateral location.
  • wing nuts are used to lock the brushes in the desired location. In this fashion the brushes may be aligned for the particular application to be performed.
  • a variety of materials can be used for the brushes 24, provided that they do not damage the surface of the blanket cylinder 28. These materials include both natural and synthetic fibers. Also the brushes 24 can be mounted at an angle of up to 90° from the tangent to the surface of the blanket cylinder improve their ability to loosen and remove lint and other debris from the surface.
  • Housing 40 in the form of an inverted U-shaped channel, has a top surface 44 and parallel sides, 46 and 48 respectively. Housing 40 is mounted between pivot arms 34 in a downward position with the open end facing the blanket cylinder 28.
  • U-shaped channel 40 may be mounted forward or back relative to the centerline of the blanket cylinder 28 as desired.
  • Fig. 4 shows an embodiment wherein the brushes are mounted forward of the centerline of the blanket cylinder.
  • At least one brush 24 is mounted to the top surface 44 of housing 40 through the brush holder 25 and substantially parallel to sides 46 and 48 so that, when the cleaner is cylinder and loosen dirt and lint contained within the housing.
  • a plurality of brushes may be positioned in rows on columns within the housing 40 for use in loosening lint and debris from the surface of the blanket cylinder 28.
  • Flexible wipers 50 are positioned at the ends of sides 46 and 48 of housing 40 and serve to contact the surface of blanket cylinder 28 to provide sealing surfaces in contact with the blanket roller when the blanket cleaner is engaged. These wipers 50 also serve a secondary purpose of loosening and dislodging lint and debris 52 from the surface of the blanket cylinder 28.
  • Loosened lint and debris 52 are removed from the interior of housing 40 by means of an appropriate vacuum system.
  • a vacuum generating machine (not shown) is connected to vacuum port 58 in housing 40 by hose 56. Lint and debris 52 are conveyed through hose 56 by means of the vacuum to be deposited in an appropriate disposal unit (not shown).
  • FIG. 2-4 there is shown the general operation of the blanket cleaner in accordance with a blanket to blanket press embodiment of the present invention.
  • a web of imprinting material 60 passes between counterrotating blanket cylinders 28 and is imprinted on both front and rear sides of the web.
  • lint and debris 52 from the web 60 accumulate on the surface of the blanket cylinders 28 and, if allowed to remain thereon, tend to reduce to overall quality of the printed product.
  • blanket cleaners 20 In order to remove this lint and debris from the surface of the blanket cylinders 28, blanket cleaners 20, generally located atop the blanket cylinders 28, are biased against the cylinders by biasing means in the form of actuators 38. Generally, it is not necessary that the blanket cleaners 20 be continuously in contact with blanket cylinders 28 throughout the imprinting operation, however, where an excessive amount of lint and debris accumulate rather quickly, it may be desirable to leave them engaged during operation of the press. Under normal operating conditions the blanket cleaners 20 are periodically actuated against the blanket cylinders for a predetermined time to effect cleaning of the surface.
  • Periodic operation of the blanket cleaner of this invention may be controlled by conventional timing mechanisms related either to rotation of the presses or on command of the operator.
  • the operation of the actuator is controlled so that when blanket cleaning is desired, the actuator 38 is operated so that the cleaner is moved from the disengaged position ( Figure 3) to the engaged position ( Figure 2).
  • the brushes 24 of the brush assembly 22 are brought into contact with the surface of blanket cylinder 28.
  • the brushes 24 are utilized to wipe the blanket cylinder 28, and after a predetermined number of rotations, the actuator 38 is operated to cause the brush assembly 22 to disengage as shown in Figure 3.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP19890301211 1988-02-08 1989-02-08 Vorrichtung zum Reinigen des Gummituches einer Druckerpresse Expired EP0328369B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15325688A 1988-02-08 1988-02-08
US153256 1988-02-08

Publications (2)

Publication Number Publication Date
EP0328369A1 true EP0328369A1 (de) 1989-08-16
EP0328369B1 EP0328369B1 (de) 1992-07-08

Family

ID=22546415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890301211 Expired EP0328369B1 (de) 1988-02-08 1989-02-08 Vorrichtung zum Reinigen des Gummituches einer Druckerpresse

Country Status (5)

Country Link
EP (1) EP0328369B1 (de)
DE (1) DE68901977T2 (de)
DK (1) DK170148B1 (de)
FI (1) FI94038C (de)
NO (1) NO890516L (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0461898A1 (de) * 1990-06-14 1991-12-18 Baldwin Technology Corporation Waschvorrichtung mit rotierender Bürste
US5265537A (en) * 1988-11-17 1993-11-30 Baldwin Technology Corporation Printing press blanket cleaner
US5322015A (en) * 1988-02-08 1994-06-21 Baldwin Technology Corporation Rotating brush cleaner system
GB2300389A (en) * 1995-05-04 1996-11-06 Heidelberger Druckmasch Ag Wash-up apparatus for printing units of a rotary printing machine
WO2000040416A2 (de) * 1998-12-31 2000-07-13 Koenig & Bauer Aktiengesellschaft Vorrichtungen zum reinigen einer walze
DE19953535B4 (de) * 1998-11-09 2007-10-11 Heidelberger Druckmaschinen Ag Vorrichtung zum Druckfertigmachen einer Druckfolie
WO2017019071A1 (en) 2015-07-29 2017-02-02 Hewlett-Packard Indigo, B.V. Cleaning of a surface in a printing device
WO2017019067A1 (en) * 2015-07-29 2017-02-02 Hewlett-Packard Indigo, B.V. Cleaning of a surface in a printing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510460C2 (sv) * 1997-09-24 1999-05-25 Grafic Team International Swed Sätt och anordning för rengöring av en gummiklädd cylinder i en offsetpress

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378278A (en) * 1921-05-17 Machine
FR2117385A5 (de) * 1970-12-10 1972-07-21 Moestue Hans
DE3601539A1 (de) * 1985-01-22 1986-07-24 Gary C. St. Louis Mo. Glanzner Vorrichtung zum reinigen des uebertragzylinders einer druckerpresse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378278A (en) * 1921-05-17 Machine
FR2117385A5 (de) * 1970-12-10 1972-07-21 Moestue Hans
DE3601539A1 (de) * 1985-01-22 1986-07-24 Gary C. St. Louis Mo. Glanzner Vorrichtung zum reinigen des uebertragzylinders einer druckerpresse

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5322015A (en) * 1988-02-08 1994-06-21 Baldwin Technology Corporation Rotating brush cleaner system
US5265537A (en) * 1988-11-17 1993-11-30 Baldwin Technology Corporation Printing press blanket cleaner
EP0461898A1 (de) * 1990-06-14 1991-12-18 Baldwin Technology Corporation Waschvorrichtung mit rotierender Bürste
GB2300389A (en) * 1995-05-04 1996-11-06 Heidelberger Druckmasch Ag Wash-up apparatus for printing units of a rotary printing machine
US5730057A (en) * 1995-05-04 1998-03-24 Heidelberger Druckmaschinen Ag Cleaning assembly for cleaning printing units of a direct imaging rotary printing press
GB2300389B (en) * 1995-05-04 1998-04-22 Heidelberger Druckmasch Ag Wash-up apparatus for printing units of a rotary printing machine
DE19953535B4 (de) * 1998-11-09 2007-10-11 Heidelberger Druckmaschinen Ag Vorrichtung zum Druckfertigmachen einer Druckfolie
WO2000040416A2 (de) * 1998-12-31 2000-07-13 Koenig & Bauer Aktiengesellschaft Vorrichtungen zum reinigen einer walze
WO2000040416A3 (de) * 1998-12-31 2000-11-09 Koenig & Bauer Ag Vorrichtungen zum reinigen einer walze
WO2017019071A1 (en) 2015-07-29 2017-02-02 Hewlett-Packard Indigo, B.V. Cleaning of a surface in a printing device
WO2017019067A1 (en) * 2015-07-29 2017-02-02 Hewlett-Packard Indigo, B.V. Cleaning of a surface in a printing device
US10919332B2 (en) 2015-07-29 2021-02-16 Hp Indigo B.V. Cleaning of a surface in a printing device
US11014124B2 (en) 2015-07-29 2021-05-25 Hp Indigo B.V. Cleaning of a surface in a printing device

Also Published As

Publication number Publication date
FI94038B (fi) 1995-03-31
EP0328369B1 (de) 1992-07-08
DK55489A (da) 1989-08-09
FI890574A (fi) 1989-08-09
DE68901977D1 (de) 1992-08-13
DK170148B1 (da) 1995-06-06
NO890516L (no) 1989-08-09
FI890574A0 (fi) 1989-02-07
DE68901977T2 (de) 1993-01-14
NO890516D0 (no) 1989-02-07
FI94038C (fi) 1995-07-10
DK55489D0 (da) 1989-02-07

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