GB2035903A - Moistening apparatus - Google Patents

Moistening apparatus Download PDF

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Publication number
GB2035903A
GB2035903A GB7938698A GB7938698A GB2035903A GB 2035903 A GB2035903 A GB 2035903A GB 7938698 A GB7938698 A GB 7938698A GB 7938698 A GB7938698 A GB 7938698A GB 2035903 A GB2035903 A GB 2035903A
Authority
GB
United Kingdom
Prior art keywords
roller
moistening
plate cylinder
application roller
buffer
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
GB7938698A
Other versions
GB2035903B (en
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.)
Polygraph Leipzig Kombinat Veb
Original Assignee
Polygraph Leipzig Kombinat Veb
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 Polygraph Leipzig Kombinat Veb filed Critical Polygraph Leipzig Kombinat Veb
Publication of GB2035903A publication Critical patent/GB2035903A/en
Application granted granted Critical
Publication of GB2035903B publication Critical patent/GB2035903B/en
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
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/36—Inking-rollers serving also to apply ink repellants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/26—Damping devices using transfer rollers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

A moistening apparatus for a rotary printing machine comprises a ductor roller (12), a moistening roller (3) and an intermediate and application roller (4) which engages a plate cylinder (5) as well as an inking roller (6). A buffer roller (9) provided with a hydrophilic surface is associated with the intermediate and application roller (4). Thus, when plate gap 8 passes the intermediate and application roller 4, excess moisture is retained on buffer roller 9, thus ensuring that the plate is not over-moistened immediately after the plate gap. <IMAGE>

Description

SPECIFICATION Moistening apparatus The present invention relates to a moistening apparatus for a rotary printing machine.
DE 1 611 208 discloses a moistening apparatus comprising a ductor roller, a moistening roller and an intermediate and application roller; the intermediate and application roller being in effective connection with a plate cylinder as well as with an inking roller.
It is a disadvantage of this disclosure that in consequence of reactions of the plate cylinder channel, there is an excessively high offer of moistening medium behind the plate cylinder channel, which leads to deleterious effects on the printed article According to the present invention there is provided a moistening apparatus for a rotary printing machine, comprising a ductor roller, a moistening roller, an inking roller, a plate cylinder, an application roller disposed to engage the plate cylinder and the inking roller and a buffer roller provided with a hydrophilic surface and operably associated with the application roller.
The plate cylinder may be provided with an axially extending channel having a circumferential dimension which is shorter than the circumference to the buffer roller.
The moistening apparatus may comprise drive means to displace the buffer roller axially thereof.
An embodiment of the present invention will now be more particularly described by way of example and with reference to the accompanying drawing in which: Figure 1 shows a moistening apparatus embodying the present invention, and Figure 2 shows a transverse motion drive.
The moistening apparatus shown in Fig. 1 comprises a ductor roller 2 rotating in a moistening medium trough 1, a moistening roller 3 and an intermediate and application roller 4.
The intermediate and application roller 4 is in effective connection with a plate cylinder 5 and an inking roller 6 and the inking roller 6 through an application roller 7 with the plate cylinder 5. The plate cylinder 5 is provided with a plate cylinder channel 8; the length of the plate cylinder channel being designated by 1. A buffer roller 9 is in effective connection with the intermediate and application roller 4. The buffer roller 9 is provided with a hydrophilic surface, preferably of chrome.
Bearing limbs 10 of the buffer roller are journalled on bearing blocks 11, which are inclined in the direction of the intermediate and application roller; the buffer roller being urged in consequence of its inherent weight against the intermediate and application roller 4. The circumference of the buffer roller 9 is greater than the length 1 of the plate cylinder channel.
The buffer roller 9 may be connected with a known transverse motion drive 1 2 comprising a double lever, one arm of which is connected with the bearing limb 10 of the buffer roller 9 and the second arm of which carries a cam roller, a drive cam and a spring system (illustrated schematically in Fig. 2). The driving cam is connected through a coupling with a machine drive. The intermediate and application roller 4 is connected with a roller shift comprising a lever 13 and electromagnet 14.
The direction of inclination of the bearing blocks 11 corresponds to the direction of motion of the intermediate and application roller 4 on actuation of the roller shift 1 3 and 14.
The manner of operation of the apparatus is as follows: Ink is fed by way of the application roller 7 and the intermediate and application roller 4 to an impression plate clamped onto the plate cylinder 5.
The feed of the moistening medium also takes place by way of the intermediate and application roller 4.
When the plate cylinder channel 8 runs through the region of the intermediate and application roller 4, the moistening medium placed ready by the moistening device but not required is stored by means of the buffer roller 9. The stored quantity of moistening medium is continuously imparted to the impression plate when it is disposed in the region of the intermediate and application roller 4.
The excessively high offer of moistening medium in known moistening devices is thus avoided.
If interruptions in a printing operation occur the intermediate and application roller 4 with the buffer roller 9 is displaced through actuation of the magnet 14, and the intermediate and application roller is thus separated from the impression plate. Through actuation of the coupling, it is possible to connect the transverse motion drive 1 2 of the buffer roller 9 with the machine drive and thereby to assure an additional lateral distribution of the moistening medium.
The use of a hydrophilic storage roller is applicable on all known types of moistening apparatus with one or more moistening application roller or rollers.
1. A moistening apparatus for a rotary printing machine, comprising a ductor roller, a moistening roller, an inking roller, a plate cylinder, an application roller disposed to engage the plate cylinder and the inking roller, and a buffer roller provided with a hydrophilic surface and operably associated with the application roller.
2. A moistening apparatus as claimed in claim 1, wherein the plate cylinder is provided
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Moistening apparatus The present invention relates to a moistening apparatus for a rotary printing machine. DE 1 611 208 discloses a moistening apparatus comprising a ductor roller, a moistening roller and an intermediate and application roller; the intermediate and application roller being in effective connection with a plate cylinder as well as with an inking roller. It is a disadvantage of this disclosure that in consequence of reactions of the plate cylinder channel, there is an excessively high offer of moistening medium behind the plate cylinder channel, which leads to deleterious effects on the printed article According to the present invention there is provided a moistening apparatus for a rotary printing machine, comprising a ductor roller, a moistening roller, an inking roller, a plate cylinder, an application roller disposed to engage the plate cylinder and the inking roller and a buffer roller provided with a hydrophilic surface and operably associated with the application roller. The plate cylinder may be provided with an axially extending channel having a circumferential dimension which is shorter than the circumference to the buffer roller. The moistening apparatus may comprise drive means to displace the buffer roller axially thereof. An embodiment of the present invention will now be more particularly described by way of example and with reference to the accompanying drawing in which: Figure 1 shows a moistening apparatus embodying the present invention, and Figure 2 shows a transverse motion drive. The moistening apparatus shown in Fig. 1 comprises a ductor roller 2 rotating in a moistening medium trough 1, a moistening roller 3 and an intermediate and application roller 4. The intermediate and application roller 4 is in effective connection with a plate cylinder 5 and an inking roller 6 and the inking roller 6 through an application roller 7 with the plate cylinder 5. The plate cylinder 5 is provided with a plate cylinder channel 8; the length of the plate cylinder channel being designated by 1. A buffer roller 9 is in effective connection with the intermediate and application roller 4. The buffer roller 9 is provided with a hydrophilic surface, preferably of chrome. Bearing limbs 10 of the buffer roller are journalled on bearing blocks 11, which are inclined in the direction of the intermediate and application roller; the buffer roller being urged in consequence of its inherent weight against the intermediate and application roller 4. The circumference of the buffer roller 9 is greater than the length 1 of the plate cylinder channel. The buffer roller 9 may be connected with a known transverse motion drive 1 2 comprising a double lever, one arm of which is connected with the bearing limb 10 of the buffer roller 9 and the second arm of which carries a cam roller, a drive cam and a spring system (illustrated schematically in Fig. 2). The driving cam is connected through a coupling with a machine drive. The intermediate and application roller 4 is connected with a roller shift comprising a lever 13 and electromagnet 14. The direction of inclination of the bearing blocks 11 corresponds to the direction of motion of the intermediate and application roller 4 on actuation of the roller shift 1 3 and 14. The manner of operation of the apparatus is as follows: Ink is fed by way of the application roller 7 and the intermediate and application roller 4 to an impression plate clamped onto the plate cylinder 5. The feed of the moistening medium also takes place by way of the intermediate and application roller 4. When the plate cylinder channel 8 runs through the region of the intermediate and application roller 4, the moistening medium placed ready by the moistening device but not required is stored by means of the buffer roller 9. The stored quantity of moistening medium is continuously imparted to the impression plate when it is disposed in the region of the intermediate and application roller 4. The excessively high offer of moistening medium in known moistening devices is thus avoided. If interruptions in a printing operation occur the intermediate and application roller 4 with the buffer roller 9 is displaced through actuation of the magnet 14, and the intermediate and application roller is thus separated from the impression plate. Through actuation of the coupling, it is possible to connect the transverse motion drive 1 2 of the buffer roller 9 with the machine drive and thereby to assure an additional lateral distribution of the moistening medium. The use of a hydrophilic storage roller is applicable on all known types of moistening apparatus with one or more moistening application roller or rollers. CLAIMS
1. A moistening apparatus for a rotary printing machine, comprising a ductor roller, a moistening roller, an inking roller, a plate cylinder, an application roller disposed to engage the plate cylinder and the inking roller, and a buffer roller provided with a hydrophilic surface and operably associated with the application roller.
2. A moistening apparatus as claimed in claim 1, wherein the plate cylinder is provided with an axially extending channel having a circumferential dimension which is shorter than the circumference to the buffer roller.
3. A moistening apparatus as claimed in either claim 1 or claim 2, comprising drive means to reciprocate the buffer roller axially thereof.
4. A moistening apparatus substantially as hereinbefore described with reference to the accompanying drawing.
GB7938698A 1978-11-15 1979-11-08 Moistening apparatus Expired GB2035903B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD20909978A DD139816A1 (en) 1978-11-15 1978-11-15 WET WORK

Publications (2)

Publication Number Publication Date
GB2035903A true GB2035903A (en) 1980-06-25
GB2035903B GB2035903B (en) 1983-01-19

Family

ID=5515336

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7938698A Expired GB2035903B (en) 1978-11-15 1979-11-08 Moistening apparatus

Country Status (5)

Country Link
DD (1) DD139816A1 (en)
DE (1) DE2938676A1 (en)
GB (1) GB2035903B (en)
SE (1) SE7909358L (en)
SU (1) SU1043037A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080588A1 (en) * 1981-11-21 1983-06-08 Heidelberger Druckmaschinen Aktiengesellschaft Inking and moistening device for an offset printing machine
US4524690A (en) * 1980-08-14 1985-06-25 Komori Printing Machinery Co., Ltd. Water supply apparatus for printing press
EP0264460A1 (en) * 1986-10-14 1988-04-27 Komori Corporation Varnishing apparatus for printed sheet
EP0336178A2 (en) * 1988-04-02 1989-10-11 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Damping system for a web-fed offset rotary press
EP0761431A1 (en) * 1995-08-09 1997-03-12 MAN Roland Druckmaschinen AG Damping unit for an offset printing machine
EP0761432A1 (en) * 1995-08-09 1997-03-12 MAN Roland Druckmaschinen AG Damping unit for an offset printing machine
CN1084252C (en) * 1996-06-06 2002-05-08 利要比株式会社 Dampening device for printing machine
US6460455B1 (en) 1999-03-16 2002-10-08 Heidelberger Druckmaschinen Ag Method for dampening a planographic printing form and dampening unit of a planographic printing machine for performing the method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3116505C2 (en) * 1981-04-25 1985-03-28 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Rotary printing machine that can be used for various printing processes
DE3732693A1 (en) * 1987-09-29 1989-04-13 Roland Man Druckmasch Forme cylinder of a sheet-fed rotary offset printing machine
DE29706932U1 (en) * 1997-04-17 1997-06-05 MAN Roland Druckmaschinen AG, 63075 Offenbach Dampening unit for an offset printing machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1611208B1 (en) * 1967-08-10 1972-03-23 Dahlgren Harold P Dampening system for a rotary offset printing machine
DE2333891A1 (en) * 1973-07-03 1975-01-23 Maschf Augsburg Nuernberg Ag MOISTURIZING UNIT FOR ROTARY OFFSET PRINTING MACHINES SEPARATELY FROM AN INKING UNIT

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524690A (en) * 1980-08-14 1985-06-25 Komori Printing Machinery Co., Ltd. Water supply apparatus for printing press
EP0080588A1 (en) * 1981-11-21 1983-06-08 Heidelberger Druckmaschinen Aktiengesellschaft Inking and moistening device for an offset printing machine
EP0264460A1 (en) * 1986-10-14 1988-04-27 Komori Corporation Varnishing apparatus for printed sheet
EP0336178A2 (en) * 1988-04-02 1989-10-11 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Damping system for a web-fed offset rotary press
EP0336178A3 (en) * 1988-04-02 1990-05-09 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Damping system for a web-fed offset rotary press
EP0761431A1 (en) * 1995-08-09 1997-03-12 MAN Roland Druckmaschinen AG Damping unit for an offset printing machine
EP0761432A1 (en) * 1995-08-09 1997-03-12 MAN Roland Druckmaschinen AG Damping unit for an offset printing machine
CN1084252C (en) * 1996-06-06 2002-05-08 利要比株式会社 Dampening device for printing machine
US6460455B1 (en) 1999-03-16 2002-10-08 Heidelberger Druckmaschinen Ag Method for dampening a planographic printing form and dampening unit of a planographic printing machine for performing the method

Also Published As

Publication number Publication date
DD139816A1 (en) 1980-01-23
DE2938676A1 (en) 1980-05-29
SU1043037A1 (en) 1983-09-23
GB2035903B (en) 1983-01-19
SE7909358L (en) 1980-05-16

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee