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US 5,159,166 AGranted
Drawroll unit
AssigneeRieter Machine Works, Ltd.
InventorsVittorino Arnosti, Konrad Boos, Bruno Gemperle, Felix Graf, Rodolf Leinhard, Emil Munz, Richard Rollin, Rolf Widmer, Armin Wirz
Life of this patent
Estimating the term…
Abstract
The drawroll unit has a heatable galette in which the shaft of the gallette is mounted in bearings which, in turn, are mounted via vibration damping devices in a stationary housing. The vibration damping devices may be in the form of bodies of interlaced wire, O-rings or the like. The vibration damping devices serve to damp vibrations of the shaft in a critical speed range within the normal speed range of the rotor so that the galette can be operated at any speed within the normal speed range.
Claims38
A drawroll unit comprising
- a heatable galette having a cylindrical shell and a rotatable shaft concentrically within and connected to said shell;
- an electric motor drivingly connected to said shaft for driving said shaft within a first predetermined speed range up to a limiting speed at which damage occurs in a short time period;
- a housing between said galette and said motor;
- a pair of axially spaced bearings rotatably supporting said shaft in said housing;
- vibration damping means between each bearing and said housing for damping vibrations of said shaft in said housing occurring within a second speed range within said first predetermined speed range, said vibrations being of a nature to otherwise cause damage over a long time period.
2 more elements
A drawroll unit comprising
- a cylindrical shell;
- an end wall integral with one end of said shell;
- a rotatable shaft secured to said end wall coaxially of said shell to define a heatable annular chamber in said shell;
- and
- a heating unit in said annular chamber, said heating unit including at least one stationary inductor body formed of a plurality of tightly packed sheets connected together with welding seams, an inductor coil about said inductor body, said coil being resiliently mounted axially and radially of said inductor body, a radial gap between said coil and said inductor body and resilient elements in said gap supporting said coil on said inductor body,said resilient elements being flat spring plates in contact with an outer surface of said inductor body at intermediate points thereof.
2 more elements
A drawroll unit comprising
- a heatable galette having a cylindrical shell and a rotatable shaft concentrically within and connected to said shell;
- an electric motor drivingly connected to said shaft for driving said shaft within a first predetermined speed range up to a limiting speed at which damage occurs in a short time period;
- a housing;
- at least one bearing rotatably supporting said shaft in said housing;
- vibration damping means between each bearing and said housing for damping vibrations of said shaft in said housing occurring within a second speed range within said first predetermined speed range, said vibrations being of a nature to otherwise cause damage over a long time period.
2 more elements
A drawroll unit comprising
- a cylindrical shell;
- an end wall integral with one end of said shell;
- a rotatable shaft secured to said end wall coaxially of said shell to define a heatable annular chamber in said shell;
- and
- a heating unit in said annular chamber, said heating unit including at least one stationary inductor body formed of a plurality of tightly packed sheets connected together with welding seams, an inductor coil in said chamber about said inductor body, said inductor coil being resiliently mounted radially of said inductor body, and a spring biasing said inductor coil axially of said inductor body.
2 more elements
A drawroll unit comprising
- a cylindrical shell;
- an end wall integral with one end of said cylindrical shell and having a centrally disposed boss with a conically tapering bore extending mid-way of said cylindrical shell;
- and
- a rotatable shaft secured to said end wall coaxially of said shell and said boss to define a heatable annular chamber in said cylindrical shell, said shaft having a first cylindrical section extending outwardly from said cylindrical shell, a conical section disposed mid-way of said cylindrical shell and matingly received in said bore of said boss mid-way of said shell and a second cylindrical section of less diameter than said first cylindrical section in the end wall.
1 more element
A drawroll unit comprising
- a cylindrical shell;
- an end wall integral with one end of said shell;
- a rotatable shaft secured to said end wall coaxially of said shell to define a heatable annular chamber in said shell;
- a housing rotatably mounting said shaft therein;
- and
- a temperature measurement sensor mounted in said housing and projecting into an annular groove in said shell, said sensor including a temperature sensing pin extending into said groove and a protective cover over said pin between said housing and said shell to preclude fibers from collecting on said pin, said protective cover having a gap therein for passage of air from said air from said annular chamber over said pin.
3 more elements
Dependencies are inferred from the claim text.