Apparatus for resurfacing the cylindrical face of large drier drums

Claim 2

Apparatus for forming predetermined complex crown contours on the exterior surface of a large creping and drier drum, whereon the contour of the end regions differs from the contour of the middle region of the drum, comprising: a carriage; means for traversing said carriage from end to end of said drier drum; grinder means rotatable on its axis for forming said crown contours, said grinder means being movably mounted on said carriage and spaced from the axis of said drier drum, said grinder means having an abrasive surface on which the center of the area of contact of the abrasive surface and the drum surface varies across the width of the abrasive surface for different traverse positions of said carriage and the center point of the abrasive surface periphery is spaced from the exterior surface of the drum by distance which varies for different traverse positions of said carriage; and cam means for causing movement of said grinder means with respect to said carriage to vary said spacing between said grinder means and said axis of said drier drum, said cam means including a cam contoured in a predetermined relationship to the predetermined crown contours to be formed on the end regions and the middle region of the surface of said drier drum and contoured to compensate for the change in distance between the center point of the abrasive surface periphery and the exterior surface of the drum resulting from the contour of the exterior surface of the drum.

Claim 3

Apparatus according to claim 1, wherein said grinder means includes a convex surface presented to contact with the drum surface at all positions of the drum surface.

Claim 4

Apparatus according to claim 1, wherein said grinder means includes a convex surface Contoured to have a slope equal to the slope of said drum surface contour at the center of the area of contact of the grinder and drum surface at all positions of the drum surface while the grinder means axis is maintained parallel to the drum axis.

Claim 5

Apparatus for forming predetermined complex crown contours on the surface of a large creping and drier drum, whereon the contour of the end regions differs from the contour of the middle region of the drum, comprising: a carriage; means for traversing said carriage along a predetermined path parallel to the axis of said drier drum; grinder means mounted on said carriage for forming said crown contour, including an abrasive surface rotatable about an axis, means to rotate said abrasive surface, and means to press said abrasive surface against said surface of said drier drum, the center of the area of contact of the abrasive surface and the drum surface varying across the width of the abrasive surface for different traverse positions of said carriage and the center point of the abrasive surface periphery being spaced from the surface of the drum by distance which varies for different traverse positions of said carriage; and means for varying the spacing between said grinder means and said drier drum axis, comprising a cam follower mounted on said grinder means, a cam cooperating with said cam follower and rotatably mounted on said carriage and contoured to vary said spacing in a predetermined relationship to said predetermined crown contours to be formed from end to end on said surface of said drier drum and contoured to compensate for the change in spacing between the center point of the abrasive surface periphery and the surface of the drum resulting from the contour of the exterior surface of the drum, and means for rotating said cam in a predetermined relationship to the traverse position of said carriage.

Claim 6

Apparatus for forming predetermined complex crown contours on the surface of a large creping and drier drum, whereon the contour of the end regions differs from the contour of the middle region of the drum, comprising: a carriage; means for traversing said carriage along a predetermined path parallel to the axis of said drier drum; grinder means mounted on said carriage for forming said crown contour, including an abrasive surface rotatable about an axis, means to rotate said abrasive surface, and means to press said abrasive surface against said surface of said drier drum, the center of the area of contact of the abrasive surface and the drum surface varying across the width of the abrasive surface for different traverse positions of said carriage and the center point of the abrasive surface periphery being spaced from the surface of the drum by distance which varies for different traverse positions of said carriage; and means for varying the spacing between said grinder means and said drier drum axis, comprising a cam follower mounted on said grinder means, a cam cooperating with said cam follower and rotatably mounted on said carriage and contoured to vary said spacing in a predetermined relationship to said predetermined crown contours to be formed from end to end on said surface of said drier drum and contoured to compensate for the change in spacing between the center point of the abrasive surface periphery and the surface of the drum resulting from the contour of the exterior surface of the drum, and means for rotating said cam in a predetermined relationship to the traverse position of said carriage.

Claim 7

Apparatus according to claim 4, wherein said means to press said abrasive surface against said surface of said drier drum includes a wheel having a convex periphery contour which has a slope equal to the slope of said drum surface contour at the center of the area of contact of the abrasive surface and drum surface at all positions of said drum surface while said abrasive surface rotational axis is maintained parallel to the drum axis.

Claim 8

Apparatus according to claim 5, wherein said periphery contour is a convex circular arc having a radius which is substantially equal to the radius determined by the equation: D(13) t/S where D(13) the radius of the periphery contour in inches, t the distance from the center of the face of the contact wheel to the desired contact point of the contact wheel and the drum surface where the drum surface contour has the greatest slope, in inches, and S the greatest slope on the surface contour of the drum in inches per inch.

Claim 9

Apparatus for forming predetermined complex crown contours on the exterior surface of a large creping and drier drum, whereon the contour of the end regions differ from the contour of the middle region of the drum, comprising: a carriage; means for traversing said carriage from end to end of said dryer drum; grinder means rotatable on its axis for forming said crown contours, said grinder means being movably mounted on said carriage and spaced from the axis of said drier drum, said grinder means including a convex surface contoured to have a slope equal to the slope of said drum surface contour at the center of the area of contact of the grinder means and drum surface at all positions of the drum surface while the grinder means axis is maintained parallel to the drum axis; and cam means for causing movement of said grinder means with respect to said carriage to vary said spacing between said grinder means and said axis of said drier drum, said cam means including a cam contoured in a predetermined relationship to the predetermined crown contoUrs to be formed on the end regions and the middle region of the surface of said drier drum.

Claim 10

Apparatus for forming predetermined complex crown contours on the exterior surface of a large creping and drier drum, whereon the contour of the end regions differ from the contour of the middle region of the drum, comprising: a carriage; means for traversing said carriage from end to end of said dryer drum; grinder means rotatable on its axis for forming said crown contours, said grinder means being movably mounted on said carriage and spaced from the axis of said drier drum, said grinder means including a convex surface contoured to have a slope equal to the slope of said drum surface contour at the center of the area of contact of the grinder means and drum surface at all positions of the drum surface while the grinder means axis is maintained parallel to the drum axis; and cam means for causing movement of said grinder means with respect to said carriage to vary said spacing between said grinder means and said axis of said drier drum, said cam means including a cam contoured in a predetermined relationship to the predetermined crown contoUrs to be formed on the end regions and the middle region of the surface of said drier drum.

Claim 11

Apparatus for forming predetermined complex crown contours on the surface of a large creping and drier drum, whereon the contour of the end regions differs from the contour of the middle of the drum, comprising: a carriage; means for traversing said carriage along a predetermined path parallel to the axis of said drier drum; grinder means mounted on said carriage for forming said crown contour, including a rotatable abrasive surface, means to rotate said abrasive surface about an axis, and means to press said abrasive surface against said surface of said drier drum, said means to press said abrasive surface against said surface of said drier drum includes a wheel having a convex periphery contour which has a slope equal to the slope of said drum surface contour at the center of the area of contact of the abrasive surface and drum surface at all positions of said drum surface while said abrasive surface rotational axis is maintained parallel to the drum axis; and means for varying the spacing between said grinder means and said drier drum axis, comprising a cam follower mounted on said grinder means, a cam cooperating with said cam follower and rotatably mounted on said carriage and contoured to vary said spacing in a predetermined relationship to said predetermined crown contours to be formed from end to end on said surface of said drier drum, and means for rotating said cam in a predetermined relationship to the traverse position of said carriage.

Claim 12

Apparatus for forming predetermined complex crown contours on the surface of a large creping and drier drum, whereon the contour of the end regions differs from the contour of the middle of the drum, comprising: a carriage; means for traversing said carriage along a predetermined path parallel to the axis of said drier drum; grinder means mounted on said carriage for forming said crown contour, including a rotatable abrasive surface, means to rotate said abrasive surface about an axis, and means to press said abrasive surface against said surface of said drier drum, said means to press said abrasive surface against said surface of said drier drum includes a wheel having a convex periphery contour which has a slope equal to the slope of said drum surface contour at the center of the area of contact of the abrasive surface and drum surface at all positions of said drum surface while said abrasive surface rotational axis is maintained parallel to the drum axis; and means for varying the spacing between said grinder means and said drier drum axis, comprising a cam follower mounted on said grinder means, a cam cooperating with said cam follower and rotatably mounted on said carriage and contoured to vary said spacing in a predetermined relationship to said predetermined crown contours to be formed from end to end on said surface of said drier drum, and means for rotating said cam in a predetermined relationship to the traverse position of said carriage.

Claim 13

Apparatus according to claim 8, wherein said contoured periphery of said wheel is resilient.