Winding – tensioning – or guiding – Convolute winding of material – Detector – control – or material responsive stop
Reexamination Certificate
1999-11-08
2001-12-04
Jillions, John M. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
Detector, control, or material responsive stop
C242S542100, C242S541400, C242S414100, C073S862192, C073S862290, C073S862541
Reexamination Certificate
active
06325321
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 198 51 483.2, filed on Nov. 9, 1998, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process to operate a reel winding device having at least two drive mechanisms acting on a material web roll with different driving forces during winding. In addition, the invention relates to a reel winding device having at least two drive mechanisms acting on a roll, and to a measuring device to be utilized in conjunction with the process and/or apparatus.
A reel winding device can be formed, for example, by a two-drum winder which is used to wind a material web into a wound roll. Alternatively, it can be formed by a contact roll winder in which the roll is driven both centrally by a center drive as well as by a contact roll on its circumference. The contact roll can also be embodied as a backup roll and take on at least a portion of the roll weight.
2. Discussion of Background Information
It has now been found that, when starting up reel winding devices, for example, it takes a relatively long time until both drives of the winding rolls are adjusted so that the desired winding tension and, thus, the desired winding tightness progression has been generated in the wound roll. Many problems also arise during operation that can only be alleviated by trial and error in adjusting the drive power for the individual winding rolls. The situation is complicated in that when transitioning from one material, i.e., from one type or quality, to another, different winding ratios are very often required so that one must practically run new attempts or trials for every type of material. Since the designer and the operator of reel winding devices only have limited opportunities to control the function of the king roll drives, most of the time a safe possibility is lacking for checking conformity between the preset target curves and the actual values for the peripheral force difference as a way of influencing winding tightness on the wound roll. Once there is a guarantee that the preset target curves are actually still being run, it becomes possible to begin optimizing roll quality and eliminating winding errors.
Determining the king roll peripheral forces from the electrical drive power, i.e., motor current and motor voltage, the efficiency levels of the motor and any gears that are present, and the geometric conditions, such as diameter of the winding rolls, web speed and the like is not exact enough, particularly in the acceleration phase. Even information about the efficiency of the motor and the gear is oftentimes not exact enough.
SUMMARY OF THE INVENTION
The present invention facilitates the adjustment of the drive power of winding rolls.
In this regard, the invention utilizes a process similar in general to above-mentioned process which also includes determining driving forces directly at the location of introduction into the material web roll, and generating a difference in force from this.
The driving force on every winding roll can be determined where it acts on the wound roll. The “location” of the introduction of force in this connection does not relate absolutely to the axial position, which can have a certain extension in the case of, e.g., king rolls. A preferred location where the peripheral force can be determined is a respective circumference of the winding rolls. However, it is also possible to determine the peripheral force at another position of the winding roll which has a defined connection with the surface with respect to the transmission of force. For example, it is also possible to determine the peripheral force at a roll pin that has a smaller diameter than the working circumference of the winding roll but whose surface is rigidly connected to the surface of the working area. If the peripheral forces on the winding rolls are now directly determined, it is also possible to establish with a high degree of accuracy the difference in force with which the winding rolls are acting on the wound roll. The same applies if the driving forces are determined directly on the driven core receptacle, for example, and on the circumference of the contact roll. In this case, a conversion of the driving force on the ratios prevailing on the circumference might be required, something which is possible without difficulty by using the known torque relationship. The difference in force allows a statement to be made about the tension with which the material web is being wound. Since the difference in tension can be displayed directly, adjusting the drives or the drive power is relatively simple. For example, the winding roll that first comes into contact with the paper web can be adjusted to a certain rpm and then the second winding roll can be driven in such a way that the desired torque difference and, therefore, the desired difference in force of the peripheral forces is produced.
The peripheral forces are preferably determined outside the winding process. Therefore, the determination of the peripheral forces can be conducted during start-up or when malfunctions occur without a material web being required for this purpose. This has two advantages, i.e., no unnecessary refuse is produced, and no fear of interference from a material web roll being formed.
In this connection, it may be preferable for the winding roll that first comes into contact with the material web to be braked. As a result, the web tension of the incoming material web can be simulated, i.e., a counter momentum acting against the driving power can be generated. This type of counter momentum can be applied, for example, by a roller that is pressed on the corresponding winding roll and loaded with a braking momentum.
As an alternative or in addition to determining the difference in force outside the actual winding process, measurement can also naturally take place during winding if there are free areas on the winding rolls at which the peripheral force can be to checked. These free areas can be present, e.g., axially outside the wound roll. However, it is also possible to measure in the circumferential direction at those positions that are not covered by the wound roll or the material web.
In this case, it may be preferable for the difference in force to be supplied as an actual value to a control circuit which regulates the driving of the two winding rolls in such a way that the difference in force corresponds to a preset target value. As a result, the winding tightness of the wound roll can be regulated.
In this connection, it may be preferable for the target value to have a progression that is a function of the diameter of the material web roll. Therefore, the desire for the winding tightness to diminish from the inside to the outside is taken into account. Naturally, the winding tightness is still influenced by additional factors. These factors can be taken into consideration in prescribing the progression of the target value.
The friction ratios between the material web and the respective winding roll are advantageously imitated when determining the peripheral forces. Namely, the winding rolls act on the wound roll with a certain peripheral or tangential force. However, due to the friction ratios between the surface of the corresponding winding roll and the surface of the wound roll, this peripheral force is not always transmitted completely to the wound roll. In some cases, particularly when the material web has a very smooth surface, a certain slippage is generated. If these friction ratios are now taken into consideration when determining the peripheral force, the measurement will be more precise still, i.e., the actual forces acting on the wound roll and therefore the difference in force can be measured.
The present invention also utilizes a reel winding device similar in general to the above-mentioned that also includes a measuring system, cooperating with the drive mech
Maurer Jorg
Schauz Alfred
Greenblum & Bernstein P.L.C.
Jillions John M.
Voith Sulzer Papiertechnik Patent GmbH
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