JP2004249733A - Method and apparatus for controlling inking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce waste paper and preferably automatically fill and preset an inking device by extending a device for controlling the inking device, in a device and a method for adjusting ink feed for filling/presetting an inking device in advance of starting printing, in a device and method for controlling the inking device of a printing machine, particularly a sheet fed offset printing machine. <P>SOLUTION: A value corresponding to the temperature of the inking device is detected and ink feed of the inking device is controlled according to the value before starting printing. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method for controlling an inking device and to an apparatus for implementing the method described in the preamble of the method or device claims.

  In a sheet-fed offset printing press, ink is supplied by ink fountain rollers, oscillating ink transfer rollers, and subsequent ink and ink application rollers that cooperate with ink fountains. Through a plurality of inking steps in the inking unit, the printing ink is conditioned, i.e. the ink is changed to a state which is rheologically most suitable for printing. The rheological properties of this printing ink depend on the temperature, so that the ink distribution (rotation speed of the ink groove roller, oscillating ink transfer roller tact frequency, setting of the ink distribution member) does not change. If set, the roller thickness and the ink layer thickness on the printing material will change when the temperature in the inking unit changes.

  A measuring device for detecting the temperature of an inking device of a printing press is known from German Patent No. 43 12 449 as Patent Document 1. According to the invention, the air sucked from the space in the inking unit roller area is led to a temperature measuring sensor, whose signal is then used for controlling the temperature balancing device. This temperature balancing device makes it possible to adjust the inking unit rollers and the printing ink present on these rollers to a predetermined temperature level, in particular to set an optimum printing temperature. However, the problem in this case is, in part, that the temperature balancing device is costly, and furthermore, that a given temperature can only be obtained after a certain period of time.

  Due to the enormous number of ink rollers in the inking unit of a sheet-fed offset printing press, the inking unit holds a large amount of ink, so that the system reacts relatively slowly. In particular, at the start of a shift or when replacing a printing task, in order to reduce printing waste at the time of startup, perform ink leveling, and perform grading of such a layer thickness in a parallel or subsequent further step with this step. In later printing it is essential to form on rollers depending on how they are present (ink pre-setting).

According to German Patent Application Publication No. 33338143 as Patent Document 2 and German Patent Application Publication No. 198 57 218 as Patent Document 3, how to use at the time of starting printing or exchanging printing tasks is described. Ink leveling methods and ink pre-setting methods are known. However, this method can reduce printing loss at the start of a shift or at the start-up after the exchange of printing tasks as much as possible. Only when it is not only exactly matched, but also with any other printing press parameters.
German Patent No. 4312449 German Patent Application Publication No. 33338143 DE 198 57 218 A1

  The object of the present invention is therefore to extend a method for controlling an inking device, and an apparatus for carrying out the method as described in the writing section in the preamble of the method or device claims of the present application, The aim is to reduce the printing broke significantly and preferably to allow the inking unit to be automatically filled and preset.

  This object is achieved by the features of the method and / or device claims. Further developments of the invention are given in the respective subclaims.

  According to the present invention, a value corresponding to the temperature of the inking device is detected, and the setting of the inking device for adjusting the supply of the ink is performed before the start of printing according to this value.

  One or more temperature sensors are provided in the inking unit to select settings for prefilling and / or preconditioning as a function of the inking unit temperature. Alternatively, the temperature value may be derived from the operating time of the machine (past history). For this purpose, the operating time of the machine is detected in association with further parameters, among other things, in particular the temperature of the inking unit when the printing press has been operating in a predetermined operating mode for a predetermined time. Is empirically considered.

  According to the invention, the pre-filling and / or pre-adjustment (pre-setting) of the inking unit in accordance with the temperature is effected by a change of the setting, which only takes place during the pre-filling or pre-adjustment (pre-setting) of the inking unit. At this time, in particular, according to the present invention, the amount of ink to be introduced into the inking device is to be determined according to the temperature, and for that purpose, the ink distribution, the oscillating ink transfer roller, etc. A relationship determined by model calculation or empirically determined, which gives how to set at a given temperature, is to be used.

  During printing, the layer thickness of the ink, and thus the density of the ink on the material to be printed, increases with the temperature, so that the amount of ink to be introduced into the inking unit during prefilling and pre-setting also corresponds to the temperature in the inking unit. It is made to correspond. This relationship is determined by model calculation or experiment. In this way, one characteristic curve can be determined which gives which ink quantity has to be introduced into the inking unit at which inking unit temperature. Thus, for example, the setting parameters relating to the ink dispensing member, the setting parameters (the number of rotations) relating to the ink groove rollers, the setting parameters (the frequency) relating to the oscillating ink transfer roller, and the setting parameters relating to the further adjusters that determine the ink supply are specified. It becomes possible. These parameters for pre-setting and / or pre-filling can be chosen according to a further embodiment of the invention, preferably according to the printing task, ie the area to be printed. This is performed by classifying into a class having a small area to be printed, a class having a medium area to be printed, and a class having a large area to be printed.

  According to an embodiment of the present invention, a predetermined program for automatic pre-filling and pre-setting of the inking unit is used. This program adjusts the ink dispensing member for the ink groove roller, drives the ink groove roller at a specific number of rotations and a predetermined number of rotations, and drives the oscillating ink transfer roller at a specific number of reciprocations and a predetermined frequency. And a series of specific streams consisting of controlled connection / disconnection of adjusters, for example, for ink advance disconnection (roller row disconnection). According to the present invention, for example, only the number of the reciprocating steps of the swinging (thus, the ink is conveyed from the ink groove roller to the lower part of the inking unit) is changed exclusively according to the inking unit temperature. It is said. Further, according to the embodiment of the present invention, by setting the number of rotations of the duct (ink groove roller), the amount of ink to be conveyed into the inking device is given according to the temperature, or the ink distribution to the ink groove roller is controlled. The quantity of printing ink to be conveyed into the inking unit via the adjustment of the quantity member can be determined as a function of the inking unit temperature.

  In the case of an ink presetting, which determines at what point the rows of ink rollers are disconnected or reconnected, a time interval can be selected depending on the temperature of the inking unit. Suitable settings are determined by model calculations or specified empirically. In a preferred manner, the set value may be specified such that how the ink density changes according to the temperature is specified through sample printing. This makes it possible to calculate a correction factor, which gives how the corresponding set value should be changed to account for the reduction of the ink layer thickness as the temperature decreases. In this way, the characteristic curve can be calculated and stored in the storage device provided for the control unit of the inking device.

  Hereinafter, embodiments of the present invention will be described with reference to one drawing. FIG. 1 shows an ink device of a sheet-fed offset printing press with a corresponding adjuster for adjusting the ink introduction and a correspondingly provided control.

  This figure shows the upper part of the printing device of a sheet-fed offset printing press. The ink to be printed is applied on the ink groove roller 1 with a predetermined layer thickness from the ink groove cooperating with the ink groove roller 1. An ink dispensing member 3 operable under the control of the actuator 2 facing the lower side of the ink groove cooperates with the ink groove. In this manner, ink can be supplied in different manners for each zone over the width of the ink groove roller 1.

  The ink groove roller 1 is provided with a driving unit 4, and the ink groove roller can be driven at a rotational speed that can be input in advance or according to an operation rule that can be input in advance by using the driving unit 4.

  An oscillating ink transfer roller 5 is provided behind the ink groove roller 1. The ink transfer roller 5 is driven by a driving unit 6 at a frequency (a number of unit times) that can be set in advance. It is provided so as to be able to move back and forth between and the inking device roller 7 provided behind. The ink is applied via several inking unit rollers 7 and via an inking roller 8 onto a printing plate located on a plate cylinder 9.

  In the roller row of the inking device roller 7, an ink course dividing portion for dividing an ink passage is provided at one or a plurality of positions, and the ink course dividing portion can be activated by an adjuster 10 (adjustment device). ing. This allows the ink rollers 7 to be separable from one another at one or more locations, which acts to abut or separate in stages or to interrupt the ink supply accordingly. Thus, at the time of ink leveling, an ink layer thickness distribution close to that at the time of sufficient leveling can be realized.

  The actuator 2 for the ink dispensing member 3, the adjuster 10 for the ink course cutting section, and the driving sections 4 and 6 for the ink groove roller 1 or the oscillating ink transfer roller 5 are in signal connection with the control section. And a signal from the control unit is input to the drive unit of the member in a predetermined manner. The controller 11 is in signal connection with the temperature sensor 12, and the temperature sensor detects the temperature of the inking device. The control unit 11 is in signal connection with a storage device 13 in which the ink groove roller 1 and / or the ink dispensing member 3 and / or the oscillating ink transfer roller 5 and / or the ink course A temperature-dependent reference value for driving the dividing unit 10 is stored, for example, in the form of a characteristic curve. In this way, for example, the number of reciprocating steps per time in which the oscillating ink transfer roller 5 conveys ink for filling the ink device can be controlled in accordance with the temperature. The ink dispensing member 3 can be set according to the temperature as described above not only at the time of filling but also at the time of preliminary setting of the inking device. The same applies to the driving of the ink groove roller 1 by the drive unit 4 and the roller row dividing unit which can be operated when the ink unit is preliminarily set.

FIG. 1 shows an inking device of a sheet-fed offset printing press with a corresponding adjuster for adjusting the ink introduction and a correspondingly provided control unit.

Explanation of reference numerals

1. Ink groove roller 2. Actuator (ink distribution member 3)
3. Ink metering member 4. Drive unit (ink groove roller 1)
5: Oscillating ink transfer roller 6: Drive unit (oscillating ink transfer roller 5)
7 ... Ink device roller 8 ... Ink application roller 9 ... Plate cylinder 10 ... Adjuster (roller row cutting part)
11 control unit 12 temperature sensor 13 storage device

Claims (13)

A method for controlling an inking unit of a printing press, in particular a sheet-fed offset printing press, wherein the setting is made to adjust the ink supply in order to fill and / or pre-set the inking unit before the start of printing. ,
Detecting a value corresponding to the temperature of the inking unit, and setting the ink supply of the inking unit before starting printing according to the detected value. The method of claim 1, wherein
A method, wherein the inking unit temperature is detected by a sensor. The method of claim 1, wherein
A method according to claim 1, wherein a value corresponding to the temperature of the inking unit is calculated according to an operating state and an operating duration of the printing press. The method according to any one of claims 1 to 3, wherein
In the case of a swing type inking unit, the number of swings per unit time is set according to the inking unit temperature. The method according to any one of claims 1 to 4, wherein
In the case of an inking device having a drivable inking roller, the method comprises controlling the number of revolutions of the inking roller according to the temperature of the inking device. The method according to any one of claims 1 to 5,
In the case of an inking device having an ink dispensing member, the dispensing member is set according to the temperature. The method according to any one of claims 1 to 6, wherein
In the case of an inking device having a roller row dividing part, the method comprises connecting / disconnecting the roller row dividing part according to the temperature of the inking unit. 2. Apparatus for carrying out the method according to claim 1, comprising an inking device, in which the amount of ink to be supplied is adjustable by at least one adjuster or drive, and further comprising printing. In order to fill and / or pre-set the inking unit before starting, the inking unit is provided such that at least one adjuster or drive can be activated via a correspondingly provided control unit. In the device,
A value corresponding to the temperature of the inking device can be supplied to the control unit (11), and the control unit (11) is in a signal connection state with the storage device (13). Temperature-dependent settings for the adjusters (2, 10) or the drives (4, 6) are stored, and these settings are then passed on to make settings via the control (11). An apparatus characterized in that it is configured as: The apparatus according to claim 8,
The control unit (11) is in signal connection with a temperature sensor (12) in the inking unit. An apparatus according to claim 8 or claim 9, wherein
The apparatus according to claim 1, wherein the control section (11) controls the driving section (4) of the ink groove roller (1) according to the temperature. The device according to any one of claims 8 to 10, wherein
In the case of an inking device having an ink dispensing member (3), the ink dispensing member is set by the control unit (11) via the correspondingly provided actuator (2) according to the temperature. An apparatus characterized by being enabled. The device according to any one of claims 8 to 11,
In the case of the oscillating ink device, the drive unit (3) of the oscillating ink transfer roller (5) can be set by the control unit (11) according to the temperature of the inking device. An apparatus characterized by the above. An apparatus according to any one of claims 8 to 12, wherein
In the case of an inking device having a roller row dividing portion, a correspondingly provided driving portion (10) can be connected / disconnected by the control portion (11) according to the temperature of the inking device. An apparatus characterized by the above.

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