Method for the axle correction of a processing machine, and a processing machine

Abstract

In a method for the axle correction of a processing machine which includes—in order to convey and process a continuous material—at least two driven conveyance axles, at least one non-driven or driven processing axle, and at least one further non-driven axle, while the rotational speed of a driven axle is being changed, a precontrol of this axle and / or a processing axle is carried out with consideration for the elasticity module of the web material, and with consideration for a rotational inertia of at least one non-driven axle, the elasticity module of the material which comprises the continuous material being determined automatically; and a related processing machine is provided.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The invention described and claimed hereinbelow is also described in German Patent Application DE 10 2007 059 066.2 filed on Dec. 7, 2007. This German Patent Application, whose subject matter is incorporated here by reference, provides the basis for a claim of priority of invention under 35 U.S.C. 119(a)-(d).BACKGROUND OF THE INVENTION[0002]The present invention relates to a method for the axle correction of a processing machine, and a related processing machine, a related computer program, and a related computer program product.[0003]Although the text below refers mainly to printing presses, the present invention is not limited thereto, but rather is directed to all types of processing machines with which a continuous material and / or a material web is processed. The present invention may be used, in particular, with printing presses such as newspaper presses, jobbing presses, gravure presses, in-line flexo printing presses, or printing pr...

AI Technical Summary

Benefits of technology

[0016]Advantageously, it is not necessary to enter any production-dependent material data, or to make these data known by calling up earlier production runs, since the data may be ascertained automatically. It is possible to determine the settings of the acceleration compensation while the machine is at a standstill, thereby producing no waste.

[0017]The precontrol according to the present invention is a marked improvement over the prior art, since it is now possible to provide a predictive precontrol of the expected errors, instead of having to react to an error that has already occurred. Via the axle correction in the sense of a web-tension setting or control, changes in web tension that occur during an acceleration or braking phase may be reduced, which translates directly into a reduction of waste. The reduced changes in web tension also result in a reduction in register deviations, which are reduced even further—in the sense of a register control—by the axle correction described above. Given the additional precontrol, it is possible to design more effective control strategies, since greater influence may be exerted on the continuous material. If, e.g., the printing press has reached the transient state, deviations in longitudinal register may be compensated for more quickly by using stationary control strategies in which the precontrol is incorporated. If the machine is in a dynamic transition phase, which may occur, e.g., by changing the setpoint value of the web tension or the web speed in the machine, the precontrol makes it possible to perform dynamic register control more quickly.

[0018]Via the measure according to the present invention, a greater decoupling of the continuous material is attained during register controls and / or web-tension controls, and the influence of the rotational inertias and friction torques of the non-driven axles is reduced. The stationary and dynamic errors between the individual processing units and printing units decrease. In addition, register errors may be compensated for more quickly. The effect of an acceleration phase or a braking phase on the web tension is reduced, thereby making it possible to carry out faster and / or more dynamic acceleration or braking procedures. Waste is greatly reduced overall, which results, e.g., in lower production costs.

[0022]Advantageously, the precontrol is carried out with consideration for the particular (effective) rotational inertia of all non-driven axles present in a web-tension section. It is therefore possible to further increase the quality of the precontrol.

[0027]Expediently, in a processing machine according to the present invention, the arithmetic unit and the motion control of the driven axles and / or the machine process control are designed such that they are integrated in the same control hardware. Processing machines of this type are available in compact form and result in simpler handling, since it is not necessary to combine them with external components.

Problems solved by technology

The disadvantage of this, however, is that waste is produced, and evaluations of the register error observed during the measurement run must be carried out.

A manual evaluation is susceptible to error, and an automatic evaluation is costly due to the sensor elements required.

In addition, a relatively great deal of time is required to perform a measurement run, since it must be carried out for all of the different acceleration phases that occur.

The disadvantage of this solution according to the prior art is that input errors may occur when the user is specifying data, and that the necessary data, e.g., the elasticity module in particular, are not always exactly known.

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