CA2038777A1 - Offset printing press with intermediate roller for the connection of inking unit and damping unit - Google Patents
Offset printing press with intermediate roller for the connection of inking unit and damping unitInfo
- Publication number
- CA2038777A1 CA2038777A1 CA 2038777 CA2038777A CA2038777A1 CA 2038777 A1 CA2038777 A1 CA 2038777A1 CA 2038777 CA2038777 CA 2038777 CA 2038777 A CA2038777 A CA 2038777A CA 2038777 A1 CA2038777 A1 CA 2038777A1
- Authority
- CA
- Canada
- Prior art keywords
- roller
- damping
- inking
- printing press
- offset printing
- 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.)
- Abandoned
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Abstract
Abstract The invention relates to an offset printing press with an inking unit and with a damping unit, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at least one intermediate roller.
In order to provide variable operational management of the press, it is provided that the intermediate roller (31) is held position-variably in such a manner that it's position with respect to the inking roller (34) and/or damping-solution applicator roller (35) is freely selectably adjustable on a situation-related basis.
(Fig. 3)
In order to provide variable operational management of the press, it is provided that the intermediate roller (31) is held position-variably in such a manner that it's position with respect to the inking roller (34) and/or damping-solution applicator roller (35) is freely selectably adjustable on a situation-related basis.
(Fig. 3)
Description
~ 3~7 ~ ~
OFFSET PRINTING PRESS WITII INIERI~IEDIATE KOLLER FOR THE
CONNECTION OF INKING UNIT AND DAMPING U~IT
Specification The invention relates to a printing press with an inking unit and with a damping unit, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at leas~ one intermediate roller.
In certain operating situations of an offset printing press, it may be advantageous for inking unit and damping unit to be connected to one another through the intermediary of an intermediate roller. If, for example, it is desired that there should be pre-damping, then inking roller and damping-solution applicator roller assume disengaged positions with respect to the plate cylinder of the offset printing press and are connected to one another through the intermediary of the intermediate roller. The damping solution, delivered from the damping-solution box by a fountain roller of the damping unit, is supplied via a metering roller and, if applicable, further rollers to the damping-solution applicator roller, from where it is supplied via the intermediate roller to the first (as viewed in the direction of rotation of the plate cylinder) inking roller and thus to the inking unit. Also during a production run, it may be advantageous for the inking roller and damping-solution applicator roller, in contact with the plate c~linder, to be connected to one another through the intermediary of the intermediate roller. Printing presses are known in which, in the operating positions "washing position" and "printing stop", the intermediate roller is in contact with the inking roller and with the damping-solution applicator 20~7~
roller. In special situations, for example in the case of emulsification problems or the use of formes with extremely low ink acceptance with the simultaneous requirement for high ink-film thickness or even the use of metal-based inks, it may be of ad~antage to interrupt the connection with the inking unit, i.e. the intermediate roller is then in contact only with the damping-solution applicator roller. This position is designated also as the so-called "small separation".
Known also is a so-called "large separation", in which the intermediate roller is moved in such a manner that it is in contact only with the first inking roller.
Here, for example, by lateral traversing, it is able to counteract the phenomenon of stencilling.
Known from the German registered-design specification 1 932 642 is an offset printing press provided with at least one intermediate roller. The intermediate roller is held on a swivel frame, which is manually swivelable by means of a lever arrangement, as a result of which the intermediate roller can be brought into a disengaged or engaged position with respect to the inking roller and the damping-solution applicatGr roller.
The German patent specification 23 43 935 describes a damping unit for an offset printing press in which, in the case of brief interruptions in printing with the inking roller disengaged as well as with the intermediate roller lifted off the latter, the supply of damping solution to the inking unit is prevented and is reduced in the damping unit. For this purpose, the intermediate roller is in contact merely with the damping-solution applicator roller but not with the inking roller. In the operating position "printing start", the intermediate roller connects inking unit and damping unit.
OFFSET PRINTING PRESS WITII INIERI~IEDIATE KOLLER FOR THE
CONNECTION OF INKING UNIT AND DAMPING U~IT
Specification The invention relates to a printing press with an inking unit and with a damping unit, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at leas~ one intermediate roller.
In certain operating situations of an offset printing press, it may be advantageous for inking unit and damping unit to be connected to one another through the intermediary of an intermediate roller. If, for example, it is desired that there should be pre-damping, then inking roller and damping-solution applicator roller assume disengaged positions with respect to the plate cylinder of the offset printing press and are connected to one another through the intermediary of the intermediate roller. The damping solution, delivered from the damping-solution box by a fountain roller of the damping unit, is supplied via a metering roller and, if applicable, further rollers to the damping-solution applicator roller, from where it is supplied via the intermediate roller to the first (as viewed in the direction of rotation of the plate cylinder) inking roller and thus to the inking unit. Also during a production run, it may be advantageous for the inking roller and damping-solution applicator roller, in contact with the plate c~linder, to be connected to one another through the intermediary of the intermediate roller. Printing presses are known in which, in the operating positions "washing position" and "printing stop", the intermediate roller is in contact with the inking roller and with the damping-solution applicator 20~7~
roller. In special situations, for example in the case of emulsification problems or the use of formes with extremely low ink acceptance with the simultaneous requirement for high ink-film thickness or even the use of metal-based inks, it may be of ad~antage to interrupt the connection with the inking unit, i.e. the intermediate roller is then in contact only with the damping-solution applicator roller. This position is designated also as the so-called "small separation".
Known also is a so-called "large separation", in which the intermediate roller is moved in such a manner that it is in contact only with the first inking roller.
Here, for example, by lateral traversing, it is able to counteract the phenomenon of stencilling.
Known from the German registered-design specification 1 932 642 is an offset printing press provided with at least one intermediate roller. The intermediate roller is held on a swivel frame, which is manually swivelable by means of a lever arrangement, as a result of which the intermediate roller can be brought into a disengaged or engaged position with respect to the inking roller and the damping-solution applicatGr roller.
The German patent specification 23 43 935 describes a damping unit for an offset printing press in which, in the case of brief interruptions in printing with the inking roller disengaged as well as with the intermediate roller lifted off the latter, the supply of damping solution to the inking unit is prevented and is reduced in the damping unit. For this purpose, the intermediate roller is in contact merely with the damping-solution applicator roller but not with the inking roller. In the operating position "printing start", the intermediate roller connects inking unit and damping unit.
2~3~77~
Finally, US-PS 3 911 815 discloses an offset printing press with an intermediate roller, said intermediate roller ~eing held on a swivel frame, on which is situated an applicator roller, said applicator roller carrying both damping solution and also ink. If the swivel frame assumes its engaged position, the applicator roller cooperates with the plate cylinder and the intermediate roller cooperates with a damping-solution-carrying roller of the damping unit. With the swivel frame, which is movable through the intermediary oi a piston/cylinder unit, in the disengaged position, the applicator roller remains in contact with the intermediate roller; there is, however, a disengaged position between the applicator roller and the plate cylinder as well as between the intermediate roller and the roller of the damping unit.
The object of the invention is to create an offset printing press that allows particularly versatile, economic operational management of the printing press in order to achieve optimum printing results. It is, in particular, also to be possible to shorten set-up times.
The object of the invention is achieved in that the intermediate roller i~ held position-variably in such a manner that its position with respect to the inking roller and/or damping-solution applicator roller is freely selectably adjustable on a situation-related basis.
This makes it possible, in any operating position of the offset printing press, to bring the intermediate roller into engagement only with the inking roller or Gnly with the damping-solution applicator roller or to establish a connection between inking roller and damping-solution 2~33~7 ~
applicator roller. This is completely irrespective of the positions ~engaged or disengaged position with respect to the plate cylinder) of the inking and/or damping-solution applicator rollers. Finally, the freely selectable movability of the intermediate roller permits a position in which there is a connection neither with the inking roller nor with the damping-solution applicator roller. In contrast to the prior art, therefore, there is no positive mechanical control of the intermediate roller allowing merely fixed positions of the intermediate roller and, if applicable, of further rollers, but completely free operational management is made possible with regard to the intermediate roller, with the result that, on a situation-related basis, i.e. depending on the respective operating state of the offset printing press and on other parameters, it is possible for the intermediate roller to be used in accordance with the desired requirements. In this connection, it is even conceivable for the position of the intermediate roller to be changed while the operating state of the offset printing press otherwise remains the same.
According to a further development of the invention, there are provided at least two actuators, said actuators effecting the positioning of bearing points of the intermediate roller and the directions of action of said actuators enclosing an angle. This makes it possible to move the bearing points of the intermediate roller in such a manner that it is able to assume the desired position (connected position between inking roller and damping-solution applicator roller, connection with the inking roller, connection with the damping-solution applicator roller, no connection with inking roller or damping-solution applicator roller).
Since, preferably, the operating element of each ~3877 7 actuator is movable into two positions and the directions of ac~ion of both actuators enclose an angle, the four aforemen~ioned positions of the intermediate roller can be achieved by suitable, free activation.
Preferably, at least one actuator is in the ~orm of a piston~cylinder unit. Preferably, both actuators are of this design. Alternativel~, however, it is also possible for only one piston/cylinder unit to be provided and for the other ac~uator to be in the form of a spring. Preferably, the spring is a compression spring, particularly a helical compression spring. This leads to an economy version with limited positional versatility of the intermediate roller.
Since, as already mentioned, the inking roller and the damping-solution applicator roller are preferably likewise freely movable in their positions in relation to the printing forme (plate cylinder provided with printing plate) and since, moreover, there is the free selectability according to the invention of the intermediate roller, this permits a multiplicity of constellations of said rollers, allowing optimum operational management depending on the respective situation.
It is possible in this context for the positioning of the intermediate roller and/or of the inking roller and/or of the damping-solution applicator roller to be accomplished manually or by a program of a printing-press control. The positioning of the intermediate roller and/or of the inking roller and/or of the damping-solution applicator roller may be accomplished, in particular, also b~ remote control (for example from the machine-control console). The printer thus has the opportunity suitably to position the intermediate 2038~77 roller depending on the current si~uation. The printing press may be, for example, in "spinning mode", i.e. its rollers are rotating, but nothing is being printed. The following are conceivable as further "situations": the printing press has just stopped printing; the printing press has just started printing; the aforementioned situations with or without inking on the corresponding rollers; t~le printing press is running on; the printing press is in a washing position, etc. The free controllability of the intermediate roller also makes it possible to assume specific positions at intervals or iteratively. This may be accomplished both manually by the printer and also under the control of a program. In particular, it is possible to implement a link with a program-controlled remote control for ink and register.
Program interconnections may be provided also for an automatic apparatus for measuring the ink density as well as for determining the ink demand and for automatic presetting of the inking of the offset printing press.
In each of the described cases, it is possible not only for the current situation to be analyzed and for the intermediate roller to be suitably positioned, but also for the computer to take account of previous and/or future operating situations in order to position the intermediate roller and, if applicable, inking and/or damping-solution applicator rollers for optimum operational management.
The invention relates further to a process for the operation of an offset printing press provided with inking unit and damping unit, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at least one intermediate roller, - ~3~7~
and in which the intermediate roller is held position-variably in such a manner that its position wi~h respect to the inking roller and/or damping-solution applicator roller is ~reely selectably movable on a situa~ion-related basis. The situation-related position of the intermediate roller is, as already mentioned, dependent on the current and/or previous and/or fu~ure operating states of the offset printing press.
The invention is illustrated with reference to a spacimen embodiment in the drawings, in which:
Fig. 1 shows a diagram of rollers in an offset printing press;
Fig. 2 shows the diagram of rollers from Fig. 1, but in different positions; and Fig. 3 shows an intermediate roller, said intermediate roller being freely movable by means o~
actuators and being disposed between the damping and inking units of the offset printing press.
Fig. 1 shows a diagram of rollers in an offset printing press (printing press not represented in any greater detail). An inking unit 1 and a damping unit 2 are provided. The inking unit 1 comprises an ink duct 3 with an ink-metering apparatus. An ink-duct roller 4 withdraws ink in metered manner from the ink duct 3 during operation. A vibrator 5 cooperates with the ink-duct roller 4 as well as with a driven distributor 6.
Inking unit 1 and damping unit 2 additionally comprise further driven distributors 7, 8, 9 and 10. In addition, there are six rider and transfer rollers 11 to 16 and nine rubber-covered rollers 17 to 25. The 2~38~77 damping unit 2 comprises a damping-solution box 26 filled with damping solu~ion 27, with a fountain roller 28 being partially immersed in the damping solution 27.
The fountain roller 28 cooperates with a metering roller 29. Further provided are a rubber-covered roller 30 and an intermediate roller 31.
Both ink and damping solution are supplied to a printing forme 32 ~ia the described roller arrangement. The printing iorme 32 is a printing plate (not shown), said printing plate being clamped onto a plate cylinder 33.
The transfer of ink and damping solution from the inking unit l and damping unit 2, respectively, to the printing plate is effected by the rubber-covered rollers 18, 20, 23~ 25 and 30~ Consequently, the rubber-covered rollers 18~ 20~ 23 and 25 are called inking rollers 34 and the rub~er-covered roller 30 assigned to the damping unit 2 is called a damping-solution applicator roller 35. The inkins roller cooperating with the intermediate roller 31 forms - as viewed in the direction of rotation o~
the plate cylinder 33 - a first inking roller 34.
By means of a control device (not shown) it is possible for the inking rollers 34 and the damping-solution applicator roller 35 to be moved out o~ their disengaged positions with respect to the plate cylinder 33 in such a manner that they are brought into engagement with the plate cylinder 33 (Fig. 2)o The positions of the inking and damping-solution applicator rollers 34, 35 are dependent on the operating state of the offset printing press.
The aforementioned intermediate roller 31 can, according to the invention, assume different positions in that -irrespective of the positions of the inking rollers 34 and/or of the damping-solution applicator roller 35 - it 203~77 g either connects the first inking roller 34 to the damping-solution applicator roller 35 or is in contact only with ~he first inking roller 34 or cooperates only with the damping-solution applicator roller 35 or, finally, assumes a disengaged position both with respect to the first in~ing roller 34 and also with respect to the damping-solution applicator roller 35. Fig. 2 shows the position in which the intermediate roller 31 is in engagement with the inking roller 34 and with the damping-solution applicator roller 35. Fig. 1 shows the disengaged position with respect to both rollers. Owing to the simple state of affairs, the other two positions (engaged position with respect only to the first inking roller 34; engaged position with respect only ~o the damping-solution applicator roller 35) are not shown separately in the Figures.
According to the invention, therefore, the position of the intermediate roller 31 is situation-related; that is, it is freely selectably adjustable or movable depending on the current or desired operating state of the offset printing press. The positioning of the intermediate roller 31 can be accomplished either manually or, alternatively, by means of a program of a printing-press control. For manual control it is advantageous if this is performed under remote control from the machine-control console. This free controllability of the intermediate roller 31 allows the printer to intervene on a situation-related basis to influence the distribution of ink and damping solution, with it also being possible, as an alternative to a "permanent position", for the printer to move the intermediate roller 31 into a desired position for specific lengths of time. An iterative mode of operation is also possible. The same applies also to the aforementioned program control, with it also being 2~3~777 possible here for the computer of the printing-press con~rol additionally to make use o~ the previously existing operating states as a decision-making criterion for the position of the intermediate roller 31.
Furthermore, it is conceivable also to take account of future operating states, already stored in the control program of the printing press, when the decision is made with regard to the instantaneous position of the intermediate roller 31.
Fig. 3 shows, in the region of the intermediate roller 31, a part of the diagram of rollers of the offset printing press. The intermediate roller 31, which is in the form of a traversing roller, is held on a U-shaped carrier 36. The bearing points of the intermediate roller 31 are disposed on a web region 37 on the carrier 36, with a first arm 38 and a second arm 39 issuing from the web region 37. In the position shown in Fig. 3, in which the intermediate roller 31 is in contac~ wi~h the first inking roller 34 and with the damping-solution applicator roller 35, with inking roller 34 and damping-solution applicator roller 35 assuming their engaged positions with respect to the plate cylinder 33, the two longitudinal axes of the arms 38 and 39 form an angle a with respect to the horizontal 40. The angle a lies preferably in the range between 20 and 40, particularly at 30. The two arms 38 and 39 extend parallel to one another.
Provided at the free end 41 o the first arm 38 is a hole/pin connection 42, which forms an articulated connection between the arm 38 and a piston rod 43 of a first actuator 44. The first actuator 44 is in the form of a pneumatic piston/cylinder unit 45. The direction of action of the piston rod 43 extends vertically; that is, it stands perpendicularly on the horizontal 40. At - 2~38777 its end opposite the piston rod 43, the cylinder g6 of the piston/cylinder unit 41 comprises a flange plate 47, which is swivelably held on the frame of the offset printing press by means o~ a shaft 48.
Alternatively, however, it may also be provided that the cylinder 46 is fixed on the printing-press frame and that the hole/pin connection 42 is in the form of an oblong-hole/pin connection (not shown).
During the assembly of the offset printing press, the piston rod 43 is secured with a lock nut 49 (threaded pin, threaded hole, lock nut).
An adjusting apparatus with lock nut 49' is provided in the end region of the second arm 39 of the U-shaped carrier 36, with the result that the longitudinal adjustment of a further piston rod 50 of a second actuator 51 is possible. The second actuator 51 is likewise in the form of a pneumatic piston/cylinder unit 52. In contrast to the connection of the first arm 38 to the piston rod 43, the connection between the second arm 38 and the piston rod 50 is not an articulated connection. The arrangement is such that there is an in-alignment transition from the piston rod 50 to the longitudinal extent of the second arm 39. The directions of action of the piston rods 43 and 50 form an angle ~ between them. The cylinder 53 o~ the second actuator 51 is provided, at its end opposite the piston rod 50, with a flan~e plate 54, which is swivelably held on the frame of the offset printing press by means of a shaft 55. The actuators 44 and 51 are connected through the intermediar~ of pressure hoses (not shown) to a pneumatic control apparatus, which, in turn, can be operated either manually from the control console o~ the -- 203~7~ i offset printing press or under program control by the computer of a printing-press control.
The arrangement in Fig. 3 has the following operating principle:
Each actuator 44, 51 is capable o~ assuming two piston positions, i.e. its piston rod is either retracted or extended. In Fig. 3 the piston rods 43 and 50 are both in the extended position. This means that the intermediate roller 31 is in the engaged position with respect to the ~irst inking roller 34 and with respect to the damping-solution applicator roller 35. ~f the intermediate roller 31 is to assume the disengaged position according to Fig. l with respect to the inking roller 34 and with respect to the damping-solution applicator roller 35, then both piston rods 43, 50 must be moved into their retracted positions through suitable energization of the corresponding actuators 44, 51.
Starting ~rom the position shown in Fig. 3, it is additionally possible to move the intermediate roller 31 merely into the engaged position with respect to the first inking roller 34 or into the engaged position with respect to the damping-solution applicator roller 35.
This can be done irrespective of the position(s) assumed ~y the inking roller 34 and/or by the damping-solution applicator roller 35 in relation to the plate cylinder 33 (engaged position or disengaged position). In order to bring about the contacting position between inking roller 34 and intermediate roller 31, it is necessary for the piston rod 43 of the first actuator 44 to assume its retracted position and for the piston rod 50 of the second actuator 51 to assume its extended position.
Conversely, there is contact between the inte~mediate roller 31 and the damping-solution applicator roller 35 203~777 when the piston rod 43 of the first actua~or 44 assumes its extended position and the piston rod 50 of the second actuator 51 assumes its retracted position.
It becomes apparent from all this that the position of the intermediate roller can be freely selectably adiusted through suitable energization of the actuators 44, ~1.
According to the invention, therefore, it is possible in the various operating states of the offset printing press (for example "printing start", "printing stop", "predamping", 'Iwashing position"3 always to obtain the desired position of the intermediate roller 31 either manually or by means of a program.
According to an economy version (not shown) it may also be provided that one of the actuators 44, 51 is replaced by a spring. Pre~erably, a compression spring, in particular a helical compression spring, is selected as the spring. In this case, however, it is no~ possible to achieve all four previously described positions of the intermediate roller 31.
, . .
Finally, US-PS 3 911 815 discloses an offset printing press with an intermediate roller, said intermediate roller ~eing held on a swivel frame, on which is situated an applicator roller, said applicator roller carrying both damping solution and also ink. If the swivel frame assumes its engaged position, the applicator roller cooperates with the plate cylinder and the intermediate roller cooperates with a damping-solution-carrying roller of the damping unit. With the swivel frame, which is movable through the intermediary oi a piston/cylinder unit, in the disengaged position, the applicator roller remains in contact with the intermediate roller; there is, however, a disengaged position between the applicator roller and the plate cylinder as well as between the intermediate roller and the roller of the damping unit.
The object of the invention is to create an offset printing press that allows particularly versatile, economic operational management of the printing press in order to achieve optimum printing results. It is, in particular, also to be possible to shorten set-up times.
The object of the invention is achieved in that the intermediate roller i~ held position-variably in such a manner that its position with respect to the inking roller and/or damping-solution applicator roller is freely selectably adjustable on a situation-related basis.
This makes it possible, in any operating position of the offset printing press, to bring the intermediate roller into engagement only with the inking roller or Gnly with the damping-solution applicator roller or to establish a connection between inking roller and damping-solution 2~33~7 ~
applicator roller. This is completely irrespective of the positions ~engaged or disengaged position with respect to the plate cylinder) of the inking and/or damping-solution applicator rollers. Finally, the freely selectable movability of the intermediate roller permits a position in which there is a connection neither with the inking roller nor with the damping-solution applicator roller. In contrast to the prior art, therefore, there is no positive mechanical control of the intermediate roller allowing merely fixed positions of the intermediate roller and, if applicable, of further rollers, but completely free operational management is made possible with regard to the intermediate roller, with the result that, on a situation-related basis, i.e. depending on the respective operating state of the offset printing press and on other parameters, it is possible for the intermediate roller to be used in accordance with the desired requirements. In this connection, it is even conceivable for the position of the intermediate roller to be changed while the operating state of the offset printing press otherwise remains the same.
According to a further development of the invention, there are provided at least two actuators, said actuators effecting the positioning of bearing points of the intermediate roller and the directions of action of said actuators enclosing an angle. This makes it possible to move the bearing points of the intermediate roller in such a manner that it is able to assume the desired position (connected position between inking roller and damping-solution applicator roller, connection with the inking roller, connection with the damping-solution applicator roller, no connection with inking roller or damping-solution applicator roller).
Since, preferably, the operating element of each ~3877 7 actuator is movable into two positions and the directions of ac~ion of both actuators enclose an angle, the four aforemen~ioned positions of the intermediate roller can be achieved by suitable, free activation.
Preferably, at least one actuator is in the ~orm of a piston~cylinder unit. Preferably, both actuators are of this design. Alternativel~, however, it is also possible for only one piston/cylinder unit to be provided and for the other ac~uator to be in the form of a spring. Preferably, the spring is a compression spring, particularly a helical compression spring. This leads to an economy version with limited positional versatility of the intermediate roller.
Since, as already mentioned, the inking roller and the damping-solution applicator roller are preferably likewise freely movable in their positions in relation to the printing forme (plate cylinder provided with printing plate) and since, moreover, there is the free selectability according to the invention of the intermediate roller, this permits a multiplicity of constellations of said rollers, allowing optimum operational management depending on the respective situation.
It is possible in this context for the positioning of the intermediate roller and/or of the inking roller and/or of the damping-solution applicator roller to be accomplished manually or by a program of a printing-press control. The positioning of the intermediate roller and/or of the inking roller and/or of the damping-solution applicator roller may be accomplished, in particular, also b~ remote control (for example from the machine-control console). The printer thus has the opportunity suitably to position the intermediate 2038~77 roller depending on the current si~uation. The printing press may be, for example, in "spinning mode", i.e. its rollers are rotating, but nothing is being printed. The following are conceivable as further "situations": the printing press has just stopped printing; the printing press has just started printing; the aforementioned situations with or without inking on the corresponding rollers; t~le printing press is running on; the printing press is in a washing position, etc. The free controllability of the intermediate roller also makes it possible to assume specific positions at intervals or iteratively. This may be accomplished both manually by the printer and also under the control of a program. In particular, it is possible to implement a link with a program-controlled remote control for ink and register.
Program interconnections may be provided also for an automatic apparatus for measuring the ink density as well as for determining the ink demand and for automatic presetting of the inking of the offset printing press.
In each of the described cases, it is possible not only for the current situation to be analyzed and for the intermediate roller to be suitably positioned, but also for the computer to take account of previous and/or future operating situations in order to position the intermediate roller and, if applicable, inking and/or damping-solution applicator rollers for optimum operational management.
The invention relates further to a process for the operation of an offset printing press provided with inking unit and damping unit, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at least one intermediate roller, - ~3~7~
and in which the intermediate roller is held position-variably in such a manner that its position wi~h respect to the inking roller and/or damping-solution applicator roller is ~reely selectably movable on a situa~ion-related basis. The situation-related position of the intermediate roller is, as already mentioned, dependent on the current and/or previous and/or fu~ure operating states of the offset printing press.
The invention is illustrated with reference to a spacimen embodiment in the drawings, in which:
Fig. 1 shows a diagram of rollers in an offset printing press;
Fig. 2 shows the diagram of rollers from Fig. 1, but in different positions; and Fig. 3 shows an intermediate roller, said intermediate roller being freely movable by means o~
actuators and being disposed between the damping and inking units of the offset printing press.
Fig. 1 shows a diagram of rollers in an offset printing press (printing press not represented in any greater detail). An inking unit 1 and a damping unit 2 are provided. The inking unit 1 comprises an ink duct 3 with an ink-metering apparatus. An ink-duct roller 4 withdraws ink in metered manner from the ink duct 3 during operation. A vibrator 5 cooperates with the ink-duct roller 4 as well as with a driven distributor 6.
Inking unit 1 and damping unit 2 additionally comprise further driven distributors 7, 8, 9 and 10. In addition, there are six rider and transfer rollers 11 to 16 and nine rubber-covered rollers 17 to 25. The 2~38~77 damping unit 2 comprises a damping-solution box 26 filled with damping solu~ion 27, with a fountain roller 28 being partially immersed in the damping solution 27.
The fountain roller 28 cooperates with a metering roller 29. Further provided are a rubber-covered roller 30 and an intermediate roller 31.
Both ink and damping solution are supplied to a printing forme 32 ~ia the described roller arrangement. The printing iorme 32 is a printing plate (not shown), said printing plate being clamped onto a plate cylinder 33.
The transfer of ink and damping solution from the inking unit l and damping unit 2, respectively, to the printing plate is effected by the rubber-covered rollers 18, 20, 23~ 25 and 30~ Consequently, the rubber-covered rollers 18~ 20~ 23 and 25 are called inking rollers 34 and the rub~er-covered roller 30 assigned to the damping unit 2 is called a damping-solution applicator roller 35. The inkins roller cooperating with the intermediate roller 31 forms - as viewed in the direction of rotation o~
the plate cylinder 33 - a first inking roller 34.
By means of a control device (not shown) it is possible for the inking rollers 34 and the damping-solution applicator roller 35 to be moved out o~ their disengaged positions with respect to the plate cylinder 33 in such a manner that they are brought into engagement with the plate cylinder 33 (Fig. 2)o The positions of the inking and damping-solution applicator rollers 34, 35 are dependent on the operating state of the offset printing press.
The aforementioned intermediate roller 31 can, according to the invention, assume different positions in that -irrespective of the positions of the inking rollers 34 and/or of the damping-solution applicator roller 35 - it 203~77 g either connects the first inking roller 34 to the damping-solution applicator roller 35 or is in contact only with ~he first inking roller 34 or cooperates only with the damping-solution applicator roller 35 or, finally, assumes a disengaged position both with respect to the first in~ing roller 34 and also with respect to the damping-solution applicator roller 35. Fig. 2 shows the position in which the intermediate roller 31 is in engagement with the inking roller 34 and with the damping-solution applicator roller 35. Fig. 1 shows the disengaged position with respect to both rollers. Owing to the simple state of affairs, the other two positions (engaged position with respect only to the first inking roller 34; engaged position with respect only ~o the damping-solution applicator roller 35) are not shown separately in the Figures.
According to the invention, therefore, the position of the intermediate roller 31 is situation-related; that is, it is freely selectably adjustable or movable depending on the current or desired operating state of the offset printing press. The positioning of the intermediate roller 31 can be accomplished either manually or, alternatively, by means of a program of a printing-press control. For manual control it is advantageous if this is performed under remote control from the machine-control console. This free controllability of the intermediate roller 31 allows the printer to intervene on a situation-related basis to influence the distribution of ink and damping solution, with it also being possible, as an alternative to a "permanent position", for the printer to move the intermediate roller 31 into a desired position for specific lengths of time. An iterative mode of operation is also possible. The same applies also to the aforementioned program control, with it also being 2~3~777 possible here for the computer of the printing-press con~rol additionally to make use o~ the previously existing operating states as a decision-making criterion for the position of the intermediate roller 31.
Furthermore, it is conceivable also to take account of future operating states, already stored in the control program of the printing press, when the decision is made with regard to the instantaneous position of the intermediate roller 31.
Fig. 3 shows, in the region of the intermediate roller 31, a part of the diagram of rollers of the offset printing press. The intermediate roller 31, which is in the form of a traversing roller, is held on a U-shaped carrier 36. The bearing points of the intermediate roller 31 are disposed on a web region 37 on the carrier 36, with a first arm 38 and a second arm 39 issuing from the web region 37. In the position shown in Fig. 3, in which the intermediate roller 31 is in contac~ wi~h the first inking roller 34 and with the damping-solution applicator roller 35, with inking roller 34 and damping-solution applicator roller 35 assuming their engaged positions with respect to the plate cylinder 33, the two longitudinal axes of the arms 38 and 39 form an angle a with respect to the horizontal 40. The angle a lies preferably in the range between 20 and 40, particularly at 30. The two arms 38 and 39 extend parallel to one another.
Provided at the free end 41 o the first arm 38 is a hole/pin connection 42, which forms an articulated connection between the arm 38 and a piston rod 43 of a first actuator 44. The first actuator 44 is in the form of a pneumatic piston/cylinder unit 45. The direction of action of the piston rod 43 extends vertically; that is, it stands perpendicularly on the horizontal 40. At - 2~38777 its end opposite the piston rod 43, the cylinder g6 of the piston/cylinder unit 41 comprises a flange plate 47, which is swivelably held on the frame of the offset printing press by means o~ a shaft 48.
Alternatively, however, it may also be provided that the cylinder 46 is fixed on the printing-press frame and that the hole/pin connection 42 is in the form of an oblong-hole/pin connection (not shown).
During the assembly of the offset printing press, the piston rod 43 is secured with a lock nut 49 (threaded pin, threaded hole, lock nut).
An adjusting apparatus with lock nut 49' is provided in the end region of the second arm 39 of the U-shaped carrier 36, with the result that the longitudinal adjustment of a further piston rod 50 of a second actuator 51 is possible. The second actuator 51 is likewise in the form of a pneumatic piston/cylinder unit 52. In contrast to the connection of the first arm 38 to the piston rod 43, the connection between the second arm 38 and the piston rod 50 is not an articulated connection. The arrangement is such that there is an in-alignment transition from the piston rod 50 to the longitudinal extent of the second arm 39. The directions of action of the piston rods 43 and 50 form an angle ~ between them. The cylinder 53 o~ the second actuator 51 is provided, at its end opposite the piston rod 50, with a flan~e plate 54, which is swivelably held on the frame of the offset printing press by means of a shaft 55. The actuators 44 and 51 are connected through the intermediar~ of pressure hoses (not shown) to a pneumatic control apparatus, which, in turn, can be operated either manually from the control console o~ the -- 203~7~ i offset printing press or under program control by the computer of a printing-press control.
The arrangement in Fig. 3 has the following operating principle:
Each actuator 44, 51 is capable o~ assuming two piston positions, i.e. its piston rod is either retracted or extended. In Fig. 3 the piston rods 43 and 50 are both in the extended position. This means that the intermediate roller 31 is in the engaged position with respect to the ~irst inking roller 34 and with respect to the damping-solution applicator roller 35. ~f the intermediate roller 31 is to assume the disengaged position according to Fig. l with respect to the inking roller 34 and with respect to the damping-solution applicator roller 35, then both piston rods 43, 50 must be moved into their retracted positions through suitable energization of the corresponding actuators 44, 51.
Starting ~rom the position shown in Fig. 3, it is additionally possible to move the intermediate roller 31 merely into the engaged position with respect to the first inking roller 34 or into the engaged position with respect to the damping-solution applicator roller 35.
This can be done irrespective of the position(s) assumed ~y the inking roller 34 and/or by the damping-solution applicator roller 35 in relation to the plate cylinder 33 (engaged position or disengaged position). In order to bring about the contacting position between inking roller 34 and intermediate roller 31, it is necessary for the piston rod 43 of the first actuator 44 to assume its retracted position and for the piston rod 50 of the second actuator 51 to assume its extended position.
Conversely, there is contact between the inte~mediate roller 31 and the damping-solution applicator roller 35 203~777 when the piston rod 43 of the first actua~or 44 assumes its extended position and the piston rod 50 of the second actuator 51 assumes its retracted position.
It becomes apparent from all this that the position of the intermediate roller can be freely selectably adiusted through suitable energization of the actuators 44, ~1.
According to the invention, therefore, it is possible in the various operating states of the offset printing press (for example "printing start", "printing stop", "predamping", 'Iwashing position"3 always to obtain the desired position of the intermediate roller 31 either manually or by means of a program.
According to an economy version (not shown) it may also be provided that one of the actuators 44, 51 is replaced by a spring. Pre~erably, a compression spring, in particular a helical compression spring, is selected as the spring. In this case, however, it is no~ possible to achieve all four previously described positions of the intermediate roller 31.
, . .
Claims (11)
1. Offset printing press with an inking unit and with a damping unit, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at least one intermediate roller, characterized in that the intermediate roller (31) is held position-variably in such a manner that its position with respect to the inking roller (34) and/or damping-solution applicator roller (35) is freely selectably adjustable on a situation-related basis.
2. Offset printing press according to claim 1, characterized in that the situation-related position is dependent on the respective operating state of the offset printing press.
3. Offset printing press according to any one of the preceding claims, characterized by at least two actuators (44, 51), said actuators (44, 51) effecting the positioning of bearing points of the intermediate roller (31) and the directions of action of said actuators (44, 51) enclosing an angle (.beta.).
4. Offset printing press according to any one of the preceding claims, characterized in that at least one actuator (44, 51) is in the form of a piston/cylinder unit (45, 52).
5. Offset printing press according to any one of the preceding claims, characterized in that one actuator (44, 51) is in the form of a spring.
6. Offset printing press according to any one of the preceding claims, characterized in that the spring is a compression spring.
7. Offset printing press according to any one of the preceding claims, characterized in that the inking roller (34) and/or the damping-solution applicator roller (35) are likewise freely selectably movable in their positions in relation to the printing forme (32).
8. Offset printing press according to any one of the preceding claims, characterized in that the positioning of the intermediate roller (31) and/or of the inking roller (34) and/or of the damping-solution applicator roller (35) is accomplished manually or by a program of a printing-press control.
9. Offset printing press according to any one of the preceding claims, characterized in that the positioning of the intermediate roller (31) and/or of the inking roller (34) and/or of the damping-solution applicator roller (35) is accomplished by remote control.
10. Process for the operation of an offset printing press provided with inking unit and damping unit, in particular according to any one or more of preceding claims 1 to 9, with inking unit and damping unit comprising inking roller and damping-solution applicator roller - said inking roller and damping-solution applicator roller cooperating with a printing forme - as well as being connectable through the intermediary of at least one intermediate roller, characterized in that the intermediate roller (31) is freely selectably movable on a situation-related basis in its position with respect to the inking roller (34) and/or damping-solution applicator roller (35).
11. Process according to claim 10, characterized in that the situation-related position is assumed depending on the current and/or previous and/or future operating state of the offset printing press.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19904013741 DE4013741A1 (en) | 1990-04-28 | 1990-04-28 | OFFSET PRINTING MACHINE WITH INTERMEDIATE ROLLER FOR CONNECTING THE INK AND DAMPING UNIT |
| DE4013741.4 | 1990-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2038777A1 true CA2038777A1 (en) | 1991-10-29 |
Family
ID=6405365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2038777 Abandoned CA2038777A1 (en) | 1990-04-28 | 1991-03-21 | Offset printing press with intermediate roller for the connection of inking unit and damping unit |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0455008A3 (en) |
| JP (1) | JPH04229262A (en) |
| CN (1) | CN1056278A (en) |
| AU (1) | AU7534891A (en) |
| CA (1) | CA2038777A1 (en) |
| DE (1) | DE4013741A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4419850C2 (en) * | 1994-06-07 | 2002-02-28 | Koenig & Bauer Ag | Drive and changeable bridge roller |
| DE4429460B4 (en) * | 1994-08-19 | 2005-10-13 | Koenig & Bauer Ag | Rotary drive for rollers in dyeing and / or dampening and / or coating plants |
| DE19506639C2 (en) * | 1995-02-25 | 1997-03-13 | Roland Man Druckmasch | Control for a combined ink dampening system |
| DE19520841C2 (en) * | 1995-06-08 | 2003-12-04 | Roland Man Druckmasch | Inking unit for an offset printing unit and method for inking and dampening the printing form |
| DE19541418A1 (en) * | 1995-11-07 | 1997-05-15 | Heidelberger Druckmasch Ag | Offset printing machine |
| DE20303902U1 (en) * | 2003-03-12 | 2003-05-08 | Roland Man Druckmasch | Combined inking and dampening system for a printing press |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2860579A (en) * | 1956-01-10 | 1958-11-18 | Michle Goss Dexter Inc | Ink roller socket construction |
| GB1207220A (en) * | 1968-07-03 | 1970-09-30 | Pfizer & Co C | Paper coating and coated paper |
| US3911815A (en) * | 1972-05-02 | 1975-10-14 | Roland Offsetmaschf | Mechanism for dampening the printing plate of an offset printing press |
| DE2343935A1 (en) * | 1973-08-31 | 1975-03-13 | Maschf Augsburg Nuernberg Ag | Rotary offset printer dampening unit - one roller does not contact plate cylinder while distributor surface picks up ink |
| US3926116A (en) * | 1974-07-01 | 1975-12-16 | Webcrafters Inc | Dampening apparatus for offset printing press |
| DE2845932A1 (en) * | 1978-10-21 | 1980-04-24 | Heidelberger Druckmasch Ag | COMBINED MOISTURE INK FOR OFFSET PRINTING |
| GB2077660A (en) * | 1980-06-13 | 1981-12-23 | Vickers Ltd | Lithographic printing presses |
| DE3034588C2 (en) * | 1980-09-13 | 1982-11-11 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Offset rotary printing machine with a device for interrupting the dampening solution supply |
| DD156238B1 (en) * | 1981-02-26 | 1989-03-22 | Arndt Jentzsch | WRITING ROLL IN PRINTING MACHINES |
| DE3146223C2 (en) * | 1981-11-21 | 1985-03-21 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Moist inking unit for offset printing machines |
| DE3643936A1 (en) * | 1986-05-05 | 1987-11-12 | Polygraph Leipzig | Device for raising an alternating stripper roller |
| DD264653A1 (en) * | 1987-10-29 | 1989-02-08 | Polygraph Leipzig | METHOD AND DEVICE FOR REMOVING CONTAMINATION METHODS IN COMBINED HUMIDITY AND COLOR WORKS |
| JP2657275B2 (en) * | 1988-01-14 | 1997-09-24 | 株式会社小森コーポレーション | Printing press water supply |
| JPH0741707B2 (en) * | 1988-05-06 | 1995-05-10 | リョービ株式会社 | Offset printing machine with operating lever |
| DE3825517A1 (en) * | 1988-07-27 | 1990-02-01 | Wifag Maschf | DEVICE FOR SWITCHING ON AND OFF AND ADJUSTING FARBWERKS- OR. DAMPING ROLLER OF A PRINTING MACHINE |
-
1990
- 1990-04-28 DE DE19904013741 patent/DE4013741A1/en not_active Withdrawn
-
1991
- 1991-03-21 CA CA 2038777 patent/CA2038777A1/en not_active Abandoned
- 1991-04-08 EP EP19910105539 patent/EP0455008A3/en not_active Withdrawn
- 1991-04-24 AU AU75348/91A patent/AU7534891A/en not_active Abandoned
- 1991-04-27 CN CN 91102577 patent/CN1056278A/en active Pending
- 1991-04-30 JP JP3098679A patent/JPH04229262A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE4013741A1 (en) | 1991-10-31 |
| JPH04229262A (en) | 1992-08-18 |
| EP0455008A3 (en) | 1992-02-12 |
| EP0455008A2 (en) | 1991-11-06 |
| CN1056278A (en) | 1991-11-20 |
| AU7534891A (en) | 1991-11-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |