Cutting by use of rotating axially moving tool – Processes – Bit detachable
Reexamination Certificate
1999-07-12
2004-09-14
Tsai, Henry W. H. (Department: 2183)
Cutting by use of rotating axially moving tool
Processes
Bit detachable
C408S051000, C408S095000
Reexamination Certificate
active
06789984
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for drilling holes in the shell of a paper machine cylinder, in which the cylinder remains in its operating position in the paper machine.
The invention also relates to an apparatus for drilling holes in the shell of a paper machine cylinder.
2. Discussion of Background Information
Several types of equipment are known in the art for drilling holes in the shell of a cylinder in a paper machine. Examples of some embodiments of this type of equipment are disclosed in, e.g., patent publications EP-B-0448947 and EP-B-0545879.
In EP-B-0448947, a method and an apparatus are disclosed for on-site drilling of perforating holes in the shell of a cylinder, e.g., a dryer cylinder, in a paper machine, in which the cylinder need not be removed from the paper machine. The apparatus includes a spindle box equipped with a plurality of spindle heads adapted to be driven by a drive motor. The spindle box houses the drive motor which is arranged to move the spindle box relative to a framework of the drilling apparatus when the drills are actuated toward the cylinder surface to be machined. Further, the apparatus includes a drilling jig to support and tension the framework of the drilling apparatus between guideways and the shell of the cylinder to be machined. Further, the apparatus includes slide bushings arranged to guide the framework of the drilling apparatus along the guideway assembly when the apparatus is being moved into a next drilling position in the direction of the cylinder axis. The design of the apparatus uses guideways supported on the cylinder next to the cylinder being machined.
In EP-B-0545879, a further development of the above-outlined apparatus is disclosed in which each spindle head is provided with a separate slide frame that is adapted to be individually movable in the lateral direction.
These prior art apparatuses are hampered, among other drawbacks, by their complicated construction which results in, e.g., a limited range of spindle head movement. Furthermore, the system requires the use of a drilling jig, such that each different drilling pattern requires an individual drilling jig.
SUMMARY OF THE INVENTION
The present invention provides an entirely novel type of process and apparatus for drilling the shell of a cylinder in which the above-noted drawbacks of the prior art techniques are overcome.
The present invention provides a drilling apparatus that is fixed to an adjacent cylinder so that a disturbing influence of mechanical play in the structures of the cylinder is substantially eliminated prior to drilling.
In an exemplary embodiment of the process according to the present invention, play, e.g., mechanical play, can be eliminated by applying the support member onto the adjacent cylinder so as to exert tangential forces on the adjacent cylinder.
The process according to the invention can further include applying at least one support member, which is part of the drilling apparatus, onto the cylinder being machined.
The apparatus according to the present invention includes a drilling apparatus which is fixable to the adjacent cylinder and which includes a device for eliminating the disturbing influence of mechanical play in the structures of the adjacent cylinder.
In the exemplary embodiment of the apparatus, the drilling apparatus includes support members adapted to exert tangential forces on the adjacent cylinder.
In a further embodiment of the invention, the support members may be pneumatic cylinders located within the framework of the drilling apparatus and in their operating positions, are adapted to be driven tight against the cylinder to be machined.
The process and apparatus according to the invention offer a number of significant benefits, e.g., elimination of play from the structures of the adjacent cylinder which prevents even the smallest displacement of the drilling apparatus during the drilling operation. In this manner, unwanted forces that could lead to the breaking of drills can be eliminated. The construction of the apparatus facilitates drilling without a drilling jig, and unwanted movements of the cylinder being drilled can be prevented. The arrangement according to the invention offers an application of a controllable holding force. The arrangement provides a drilling apparatus with a construction which is extremely cost-advantageous and simpler than those of the prior art.
Accordingly, the present invention relates to a process for drilling holes in a shell of a paper machine cylinder, which need not be removed from its operating position. The process includes fixing a drilling apparatus to a cylinder adjacent to the cylinder to be drilled, and substantially eliminating influences of mechanical play due to structures of the adjacent cylinder prior to drilling, which includes coupling a support member to the adjacent cylinder to exert tangential forces on the adjacent cylinder. In this manner, mechanical play is substantially eliminated.
In accordance with another feature of the present invention, the process can include coupling at least one support member of the drilling apparatus to the cylinder to be drilled. Further, the process can include pressing the at least one support member against the surface of the cylinder to be drilled. The pressing of the at least one support member exerts a tangential force to the adjacent cylinder.
According to a further feature of the present invention, the fixing of the drilling apparatus can include coupling a strap to the apparatus and positioning the strap around the adjacent cylinder.
The present invention also relates to an apparatus for drilling holes in a shell of paper machine cylinder. The apparatus includes a stationary framework supportable on the paper machine, a feed frame that is radially movable along said stationary framework relative to the shell, a drive unit, a plurality of drilling modules coupled to said feed frame, which are rotatable via the drive unit, a fixing device couplable to an adjacent cylinder, a device for eliminating influence of mechanical play due to structures of the adjacent cylinder, and support members can be adapted to exert tangential forces on the adjacent cylinder.
According to a feature of the present invention, the support members can include pneumatic cylinders coupled to said stationary framework and, in their operating position, can be adapted to be driven against said cylinder to be drilled.
According to still another feature of the invention, a curved plate, positionable against a surface of the adjacent cylinder, can be coupled to the drilling arrangement.
In accordance with a still further feature of the instant invention, the fixing device can include a strap positionable around the adjacent cylinder.
The present invention also relates to an apparatus for use in a material web producing machine that includes a cylinder to be drilled and a cylinder positioned adjacent to the cylinder to be drilled. The apparatus includes a drilling arrangement adapted for drilling a shell of a cylinder, a fixing device, coupled to said drilling arrangement, which is couplable to the adjacent cylinder to eliminate influences of mechanical play due to structures of the adjacent cylinder; and a support device can be coupled to the drilling arrangement, which is adapted to press against the cylinder to be drilled. In this manner, tangential forces may be exerted on the adjacent cylinder by the drilling arrangement.
Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawing.
REFERENCES:
patent: 780799 (1905-01-01), Kabaker
patent: 1399073 (1921-12-01), Pahmeyer et al.
patent: 1854053 (1932-04-01), Millspaugh
patent: 2506202 (1950-05-01), Folkerth, Sr.
patent: 4674925 (1987-06-01), Thornton et al.
patent: 5090846 (1992-02-01), Hakala et al.
patent: 5140749 (1992-08-01), Sailas
patent: 5401232 (1995-03-01), Sailas
patent: 5927909 (1999-07-01), Parvianinen et al.
patent: 0448947 (1996-01-01),
Kahl Peter
Kugler Georg
Oechsle Markus
Vesterlund Ingmar
Greenblum & Bernstein P.L.C.
Pikoteknik Oy
Tsai Henry W. H.
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