Eccentric rotary groundwood mill

Claim 2

A rotary groundwood mill, comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine element disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said magazine element being constructed to hold a piece of wood in contact with said abrader face without substantial circumferential motion of said piece of wood relative to said second axis; and c. means to rotate said abrader disc and said magazine element, said means comprising a mechanical intercoupling of said abrader disc and said magazine element to compel rotation of said abrader disc and said magazine element at substantially the same rotational speeds so that said piece of wood held by said magazine element is subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes.

Claim 3

A rotary groundwood mill, comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine disc disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said magazine disc being constructed to hold wood chips in contact with said abrader face without substantial circumferential motion of said wood chips relative to said second axis; and c. means to rotate said abrader disc and said magazine disc said means comprising a mechanical intercoupling of said abrader disc and said magazine disc to compel rotation of said abrader disc and said magazine disc at substantially the same rotational speeds so that said wood chips held by said magazine disc are subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes.

Claim 4

A rotary groundwood mill, comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine disc disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said magazine disc being constructed to hold wood chips in contact with said abrader face without substantial circumferential motion of said wood chips relative to said second axis; and c. means to rotate said abrader disc and said magazine disc said means comprising a mechanical intercoupling of said abrader disc and said magazine disc to compel rotation of said abrader disc and said magazine disc at substantially the same rotational speeds so that said wood chips held by said magazine disc are subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes.

Claim 5

A rotary groundwood mill as set forth in claim 2 in which said magazine disc has a generally concave face facing said abrader face, said generally concave face having radial ribs for preventing substantial circumferential motion of said wood chips relative to said second axis.

Claim 6

A rotary groundwood mill as set forth in claim 2 in which said means to rotate said magazine disc comprises a hollow shaft communicating at one end thereof with said magazine space and in which means are provided to force wood chips through said hollow shaft and into said magazine space.

Claim 7

A rotary groundwood mill comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine disc disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said magazine disc being constructed to hold wood chips in contact with said abrader face without Substantial circumferential motion of said wood chips relative to said second axis; and c. means to rotate said abrader disc and said magazine disc at substantially the same rotational speeds so that said wood chips held by said magazine disc are subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes, said means comprising a radially elongated slot in one of said discs radially spaced from the axis of rotation thereof and an axially extending pin projecting from the other of said discs in alignment with said slot, said pin extending into said slot to compel rotation of said discs at identical rotation speeds.

Claim 8

A rotary groundwood mill comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine disc disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said magazine disc being constructed to hold wood chips in contact with said abrader face without Substantial circumferential motion of said wood chips relative to said second axis; and c. means to rotate said abrader disc and said magazine disc at substantially the same rotational speeds so that said wood chips held by said magazine disc are subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes, said means comprising a radially elongated slot in one of said discs radially spaced from the axis of rotation thereof and an axially extending pin projecting from the other of said discs in alignment with said slot, said pin extending into said slot to compel rotation of said discs at identical rotation speeds.

Claim 9

A rotary groundwood mill as set forth in claim 2, comprising means to adjust the eccentricity of said axes.

Claim 10

A rotary groundwood mill as set forth in claim 2 comprising means to move one of said discs in an axial direction relative to the other of said discs to thereby adjust the circumferential gap between said discs.

Claim 11

A rotary groundwood mill as set forth in claim 2 in which said abrader disc comprises a plurality of radial sectors and in which separate means is provided intercoupling each of said radial sectors and said magazine disc to prevent each of said radial sectors from rotating at a speed different from the speed of said magazine disc.

Claim 12

A rotary groundwood mill, comprising: a. a first shaft rotatable about a first axis; b. an abrader disc mounted on said first shaft for rotation therewith about said first axis; said abrader disc having an abrader face disposed transversely of said first axis, said abrader disc having a radially elongated slot in said abrader face at a radial position adjacent the periphery of said abrader disc; c. a second shaft rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said second shaft being hollow; d. a magazine disc mounted on said second shaft for rotation therewith, said magazine disc having an annular face disposed in juxtaposition with said abrader face and having a central opening communicating with the hollow interior of said second shaft, said annular face being concave to define, with said abrader face, a magazine space between said discs; e. means comprising a series of radially extending ribs on said annular face of said magazine disc to hold wood chips in said magazine space in contact with said abrader face without substantial circumferential motion of said chips relative to said second axis; f. a pin carried on said magazine disc and projecting axially from said annular face in alignment with said slot, said pin extending into said slot to compel said discs to rotate at identical speeds; g. means to supply wood chips to the interior of said hollow second shaft; h. feed means arranged to force said wood chips to move through the interior of said hollow second shaft and into said magazine space; and i. means to rotate said first and second shafts at substantially the same rotational speeds so that said wood chips in said magazine space are subjected to substantially epicyclic abrasion by relative motion between said wood chips and said abrader face resulting from said eccentricity of said axes.

Claim 13

A rotary groundwood mill, comprising: a. a first shaft rotatable about a first axis; b. an abrader disc mounted on said first shaft for rotation therewith about said first axis; said abrader disc having an abrader face disposed transversely of said first axis, said abrader disc having a radially elongated slot in said abrader face at a radial position adjacent the periphery of said abrader disc; c. a second shaft rotatable about a second axis parallel to said first axis and eccentric with respect thereto, said second shaft being hollow; d. a magazine disc mounted on said second shaft for rotation therewith, said magazine disc having an annular face disposed in juxtaposition with said abrader face and having a central opening communicating with the hollow interior of said second shaft, said annular face being concave to define, with said abrader face, a magazine space between said discs; e. means comprising a series of radially extending ribs on said annular face of said magazine disc to hold wood chips in said magazine space in contact with said abrader face without substantial circumferential motion of said chips relative to said second axis; f. a pin carried on said magazine disc and projecting axially from said annular face in alignment with said slot, said pin extending into said slot to compel said discs to rotate at identical speeds; g. means to supply wood chips to the interior of said hollow second shaft; h. feed means arranged to force said wood chips to move through the interior of said hollow second shaft and into said magazine space; and i. means to rotate said first and second shafts at substantially the same rotational speeds so that said wood chips in said magazine space are subjected to substantially epicyclic abrasion by relative motion between said wood chips and said abrader face resulting from said eccentricity of said axes.

Claim 14

A rotary groundwood mill, comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine disc disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, the face of said magazine disc disposed toward said abrader face being shaped as a one turn screw to hold a log or like piece of wood in contact with said abrader face without substantial circumferential motion of said piece of wood relative to said second axis; and c. means comprisiNg a mechanical intercoupling of said abrader disc and said magazine disc to rotate said abrader disc and said magazine disc at substantially the same rotational speeds so that said piece of wood held by said magazine element is subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes.

Claim 15

A rotary groundwood mill, comprising: a. an abrader disc rotatable about a first axis and having an abrader face disposed transversely of said first axis; b. a magazine disc disposed in juxtaposition with said abrader face of said abrader disc to provide a magazine space therebetween and being rotatable about a second axis parallel to said first axis and eccentric with respect thereto, the face of said magazine disc disposed toward said abrader face being shaped as a one turn screw to hold a log or like piece of wood in contact with said abrader face without substantial circumferential motion of said piece of wood relative to said second axis; and c. means comprisiNg a mechanical intercoupling of said abrader disc and said magazine disc to rotate said abrader disc and said magazine disc at substantially the same rotational speeds so that said piece of wood held by said magazine element is subjected to substantially epicyclic abrasion by relative motion between said piece of wood and said abrader face of said abrader disc resulting from said eccentricity of said axes.

Claim 16

A rotary groundwood mill as set forth in claim 1 in which said magazine element comprises a clamp member constructed to hold a log or like piece of wood in contact with said abrader face without substantial circumferential motion of said piece of wood relative to said second axis and in which means is provided positively to urge said clamp member toward said abrader face.

Claim 17

A rotary groundwood mill as set forth in claim 1 in which said magazine element comprises a plurality of concentrically mounted clamp members disposed at spaced circumferential positions about said second axis and each constructed to hold a log or like piece of wood in contact with said abrader face without substantial circumferential motion of said pieces of wood relative to said second axis.

Claim 18

A rotary groundwood mill as set forth in claim 12 in which spring means are provided for each of said clamp members to urge the latter positively toward said abrader face.

Claim 19

A rotary groundwood mill, comprising: a. a shaft rotatable about a first axis; b. a plurality of axially spaced abrader discs mounted on said shaft for rotation therewith and each having an abrader face on each side thereof; c. a plurality of axially spaced annular magazine discs each having a concave face disposed in juxtaposition with a respective one of said abrader faces to define an individual magazine space between each pair of juxtaposed abrader and concave faces; d. means to retain said magazine discs as a unit and to support said unit for rotation about a second axis parallel to said first axis and eccentric with respect thereto; e. means to supply wood chips to each of said magazine spaces; f. means comprising radial ribs on each of said concave faces to hold wood chips in contact with the corresponding abrader face without substantial circumferential motion relative to said second axis; g. means to rotate said shaft and said unit of magazine discs at the same rotational speed about said first and second axes, respectively, so that wood chips in each of said magazine spaces are subjected to substantially epicyclic abrasion by relative motion between said wood chips and the corresponding one of said abrader faces resulting from said eccentricity of said axes.

Claim 20

A rotary groundwood mill, comprising: a. a shaft rotatable about a first axis; b. a plurality of axially spaced abrader discs mounted on said shaft for rotation therewith and each having an abrader face on each side thereof; c. a plurality of axially spaced annular magazine discs each having a concave face disposed in juxtaposition with a respective one of said abrader faces to define an individual magazine space between each pair of juxtaposed abrader and concave faces; d. means to retain said magazine discs as a unit and to support said unit for rotation about a second axis parallel to said first axis and eccentric with respect thereto; e. means to supply wood chips to each of said magazine spaces; f. means comprising radial ribs on each of said concave faces to hold wood chips in contact with the corresponding abrader face without substantial circumferential motion relative to said second axis; g. means to rotate said shaft and said unit of magazine discs at the same rotational speed about said first and second axes, respectively, so that wood chips in each of said magazine spaces are subjected to substantially epicyclic abrasion by relative motion between said wood chips and the corresponding one of said abrader faces resulting from said eccentricity of said axes.

Claim 21

A rotary groundwood mill as set forth in claim 14 in which each of said abrader discs has a radially elongated slot, said slots being axially aligned, and in which pin means extending through said slots and rigidly held in said magazine discs prevents said magazine discs and said abrader discs from rotating at different speeds.

Claim 22

A rotary groundwood mill as set forth in claim 15 in which said shaft is hollow and in which said wood chips supply means includes the hollow space in said shaft, said shaft having a plurality of openings providing wood chip passages between the interior of said shaft and said magazine spaces.

Claim 23

A rotary groundwood mill as set forth in claim 1 in which said abrader face of said abrader disc is substantially flat.