Paper making and fiber liberation – Processes and products – Lead strip forming and/or guiding
Reexamination Certificate
2001-05-25
2002-11-19
Hastings, Karen M. (Department: 1731)
Paper making and fiber liberation
Processes and products
Lead strip forming and/or guiding
C162S195000, C162S255000, C162S286000, C162S310000
Reexamination Certificate
active
06482294
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a machine for manufacturing a material web, in particular a paper or cardboard web, having a pick-up suction roll that is disposed between a wire section and a press section and is wound around by an air-permeable endless belt. In the vicinity of the pick-up suction roll, the material web is taken from a wire belt by the endless belt in order to then be supplied to a first press of the press section.
2. Discussion of Background Information
In paper machines that have been conventional up to now, a paper web having a width that changes can, as a rule, only be transferred into the press section in an open fashion, i.e., without a pick-up suction roll. It is in fact conceivable to first adjust the receiving zone of the pick-up suction roll and then to manually adjust the relevant edge-side cutting elements in order to establish the desired web width. However, this is relatively costly and cannot be carried out with the required precision in every case.
SUMMARY OF THE INVENTION
The present invention provides an improved machine of the type mentioned at the beginning, which permits different web widths to be adjusted in as trouble-free, precise, and reproducible a manner as possible, particularly even with a closed web transfer into the press section.
The above-noted aspect is attained according to the present invention in that the width of the material web can be adjusted by adjustable size cutting elements provided in the vicinity of the wire belt, and the suction width of the pick-up suction roll can be adjusted by adjustable sizing strips associated with it. Moreover, an adjusting system is provided for a preferably simultaneous, and at least essentially synchronous, motor-induced adjustment of the size cutting elements and the sizing strips. In this regard, the adjustable size cutting elements can be constituted in particular by adjustable sizing spray nozzles.
Because of the present invention, it is now possible to execute a respective change in the web width, particularly even when there is a closed web transfer into the press section. A respective width change is now possible in an extremely simple manner and with a high degree of precision. There is also the assurance that the respective adjustments can be reproduced at any time.
The adjusting system preferably includes a control device which can be used to preset the respective size widths or associated reference positions of the size cutting elements and sizing strips. Suitable different size widths or reference positions can be programmed and/or stored by the control device.
In one embodiment of the machine according to the present invention, the adjusting device include adjusting drives that act on the size cutting elements and sizing strips and preferably include at least one path measuring system.
Suitably, at least one adjusting drive is constituted by a spindle drive. Such a spindle drive can, for example, include at least one adjusting motor provided on a spindle. In principle, a cylinder/piston unit or the like can also be provided, for example, as an adjusting drive. Different adjusting drives can also be used, at least in part, for the different elements to be driven. In a preferred embodiment of the machine according to the present invention, the adjusting drives and, if necessary, the path measuring system as well, are connected to the control device.
In order to produce a transfer strip that is made of the material web and in order to widen out the material web, another laterally adjustable cutting element or the like can be provided, for example, once again constituted by a spray nozzle, such that the adjusting drive associated with this additional cutting element is preferably also connected to the control device.
It is advantageous if, for the transferal of the transfer strip into the press section, the size cutting elements and the sizing strips are first adjusted according to a presettable maximal size width, to which end, for example, the control device can be correspondingly adjusted or programmed. As a result, the transfer strip can be guided through the machine in a better fashion.
It is also advantageous if, after the transferal of the transfer strip into the press section, the size cutting elements and the sizing strips are moved into their reference position corresponding to the respectively desired size width. The control device can again be correspondingly adjusted or programmed for this as well. Preferably, the size cutting elements and the sizing strips can be moved into their reference positions corresponding to the respectively desired size width the moment the material web has widened out. The control device can, in particular, include an electronic control unit. At least part of the adjusting drives can also be remote-controlled.
According to one aspect of the present invention, a machine is provided for producing a material web, in particular a paper or cardboard web, having a pick-up suction roll disposed between a wire section and a press section and wound around by an air-permeable endless belt, and in the vicinity of the pick-up suction roll, the material web is taken from a wire belt by the endless belt in order to then be supplied to a first press of the press section. The machine includes adjustable size cutting elements that adjust the width of the material web, the adjustable cutting elements provided adjacent the wire belt, adjustable sizing strips that adjust the suction width of the pick-up suction roll, the adjustable sizing strips operatively associated with the suction roll, and an adjusting system that provides simultaneous, at least essentially synchronous motor-induced adjustment of the size cutting elements and the sizing strips.
In other aspects of the machine according to the present invention, the adjustable size cutting elements include adjustable sizing spray nozzles, the adjusting system includes a control device that predetermines at least one of respective size widths and associated reference positions of the size cutting elements and the sizing strips, and at least one of different size widths and reference positions can be at least one of programmed and stored by the control device. The adjusting system may also include at least one adjusting drive that acts on the size cutting elements and the sizing strips, the adjusting system may also include at least one path measuring system, and the at least one adjusting drive may be a spindle drive. Additionally, the spindle drive may include at least one adjusting motor provided on the spindle, the at least one adjusting drive may be a cylinder/piston unit, and at least one of the adjusting drives and a path measuring system may be connected to the control device.
In another aspect of the present invention, the machine may further include an additional laterally adjustable cutting element to produce a transfer strip made of the material web and to widen out the material web, and an additional adjusting drive associated with the additional cutting element. The additional adjusting drive may also be connected to the control device, and the additional adjustable cutting element may include a spray nozzle.
In a further aspect of the present invention, the size cutting elements and the sizing strips may be initially adjusted to a predetermined maximal size width for the transferal of the transfer strip into the press section. In this regard, the size cutting elements and the sizing strips may be movable into respective reference positions that correspond to a respectively desired web size width, after the transfer strip has been transferred into the press section, and the size cutting elements and the sizing strips may be movable into respective reference positions that correspond to the respectively desired size web width once the material web has widened out.
In another aspect of the present invention, the control device may include an electronic control unit. Additionally, the at least one adjusting drive may be remote-controlled.
Accordin
Greenblum & Bernstein P.L.C.
Hastings Karen M.
Voith Paper Patent GmbH
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