AN IMPROVED CUTTER HEAD FOR FRIZZING MACHINES FOR DRESSING WOOD AND METAL
Year: 1878

page_text: LETTERS PATENT to Rudolph Naatz, of Berlin, in the Kingdom of Prussia, for
the Invention of "AN IMPROVED CUTTER HEAD FOR FRIZZING MACHINES
FOR DRESSING WOOD AND METAL."
Sealed the 11th March 1879, and dated the 19th September 1878.
PROVISIONAL SPECIFICATION left by the said Rudolph Naatz at the Office
of the Commissioners of Patents on the 19th September 1878.
"AN IMPROVED
RUDOLPH NAATZ, of Berlin, in the Kingdom of Prussia.
CUTTER HEAD FOR FRIZZING MACHINES FOR DRESSING WOOD AND METAL."
My Invention relates to the class of frizzing bits or rotary cutters for wood and
metal working machines which are reversible, so as to present a cutting edge in
either direction; and the Invention consists in the construction and arrangement of
parts herein-after more fully explained.
In the accompanying Drawing forming part of this Specification Figure 1 is a
transverse sectional view representing the arrangement of cutting bits when
operating in either direction; Figure 2 is a perspective view of the complete cutter
head; Figure 3 is a vertical sectional view of the latter; Figures 4 and 5 are
detached views of one of the cutters; Figure 6 is a face view of a plate upon which
the cutters are adjustable.
The letter A denotes the cutter spindle of a planing, moulding, or other wood
working machine. It is provided with a shank B for the bits C, and with an inside
collar or shoulder D for supporting the bits. The shank B is screw-threaded, and
receives a long nut E which serves to retain the bits or cutters in position. The
bits or cutters are of a segmental shape, and have straight sides a and a convex or
rounded back b, as is shown more fully in Figures 4 and 5. The external configu-
ration of the bits is substantially the same as in the ordinary bits in common use.
Dosing G71

page_text: In the common form of cutter head, in which the bits are reversible, it is necessary
to leave a space between each pair of bits, so as to enable the same to be adjusted.
In the present instance I use a larger number of bits than usual heretofore in
reversible cutters, and construct and arrange the bits in such a manner that they
will mutually support each other, being always held in contact in the different
positions in which they may be set. The proper oscillation of the bits in a circum-
ferential direction is effected by means of the pivot pins d on a supporting plate G,
which pins enter holes e in the bits, and thus enable the latter to turn on said pins.
One of the bits is provided with a pin H, which enters a curved slot F in the
supporting plate G, and determines the movement of the bits in either direction.
The convex or rounded backs of the cutters permit the rocking of the same on
the shank of the cutter spindle, so as to set either the right or left hand cutting
edge forward or backward. In case the right-hand cutting edge of the bit is
engaged in cutting the wood the left-hand edge is thrown backward and inward,
thus leaving a space for. clearance in rear of the cutting edge. By making the
backs of my bits convex and arranging them upon a supporting plate having pivot
pins and a regulating slot, I can use an indefinite number of bits, always more than
four, and produce a cutter head which is far more effective than those hitherto
known. The bits in my Invention move together because they are always in
contact, and thus they can be more easily adjusted. The adjustment can take place
when the retaining nut or outside collar E is loosened, and the bits are tightened or
held stationary when said nut is tightened up again.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Rudolph Naatz in the Great Seal Patent Office on the 14th March
1879.
RUDOLPH NAATZ, of Berlin, in the Kingdom of Prussia. "AN IMPROVED
CUTTER HEAD FOR FRIZZING MACHINES FOR DRESSING WOOD AND METAL."
My Invention relates to the class of frizzing bits or rotary cutters for wood and
metal working machines which are reversible, so as to present a cutting edge in
either direction; and the Invention consists in the construction and arrangement of
parts herein-after more fully explained.
In the accompanying Drawing forming part of this Specification,―
Figure 1 is a transverse sectional view representing the arrangement of cutting
bits when operating in either direction.
Figure 2 is a perspective view of the complete cutter head.
Figure 3 is a vertical sectional view of the latter.
Figures 4 and 5 are detached views of one of the cutters; and
Figure 6 is a face view of a plate upon which the cutters are adjustable.
The letter A denotes the cutter spindle of a planing, moulding, or other wood
working machine. It is provided with a shank B for the bits C, and with an inside
collar or shoulder D for supporting the bits. The shank B is screw-threaded, and
receives a long nut E which serves to retain the bits or cutters in position. The
bits or cutters are of a segmental shape, and have straight sides a and a convex or
rounded back b, as is shown more fully in Figures 4 and 5. The external configuration
of the bits is substantially the same as in the ordinary bits in common use." In the
common form of cutter head, in which the bits are reversible, it is necessary to
leave a space between each pair of bits, so as to enable the same to be adjusted.
In the present instance I use a larger number of bits than usual heretofore in
reversible cutters, and I construct and arrange the bits in such a manner that they
will mutually support each other, being always held in contact with the different
positions in which they may be set. The proper oscillation of the bits in a circum-
ferential direction is effected by means of the pivot pins d on a supporting plate G,
which pins enter holes e in the bits, and thus enable the latter to turn on said pins.
One of the bits is provided with a pin H which enters a curved slot F in the
supporting plate G, and determines the movement of the bits in either direction.
The convex or rounded backs of the cutters permit the rocking of the same on
the shank of the cutter spindle, so as to set either the right or left hand cutting
edge forward or backward. In case the right-hand cutting edge of the bit is
engaged in cutting the wood the left-hand edge is thrown backward and inward,
thus leaving a space for clearance in rear of the cutting edge. By making the
backs of my bits convex, and arranging them upon a supporting plate having pivot
pins and a regulating slot, I can use an indefinite number of bits, always more than
four, and produce a cutter head which is far more effective than those hitherto
known. The bits in my Invention move together because they are always in
contact, and thus they can be more easily adjusted. The adjustment can take place
when the retaining nut or outside collar E is loosened, and the bits are tightened or
held stationary when said nut is tightened up again. A modification of the above
is shown in the plan and elevation, Figs. 7 and 8. In lieu of the face plate A,
Fig. 1, I use a plate having a number of stop upon its face, and against which the
"bits"
press when being driven in either direction. Fig. 9 is an elevation and
section through the plate; Fig. 10 represents the "bit" in detail. a is the face
Having now described and ascertained the nature of my said Invention, and in
what manner the same is or may be performed, what
plate; b, b, the bits; c, c, the stops.
I claim as new,
Patent is,-
and as secured to me by the herein-before in part recited Letters

page_text: Firstly. In a cutter head, the combination of the segmental cutters or bits having
straight sides and a rounded or convex back with the cutter spindle, bottom or
inner supporting collar, and outer or upper binding nut or collar, as and for the
purpose herein set forth.
Secondly. The combination of the supporting plate G having the pivot pins d
and arc-shaped or curved slot F, and the bits or cutters C having rounded backs b,
holes e, and pin H, with the cutter spindle and binding nut, as and for the purpose
set forth.
Thirdly. The modification above described and shown, Figs. 7, 8, 9, and 10 of the
accompanying Sheet of Drawing..
In witness whereof, I, the said Rudolph Naatz, have hereunto set my hand
and seal, this Twenty-seventh day of February, in the year of our Lord
One thousand eight hundred and seventy-nine.
Signed and sealed by the
said Rudolph Naatz, of
Berlin, Berlin Consulate
General, this Twenty-
seventh day of February
1879, before me,.
W. WEBER,
Proxy of H.B.M. Consul-General.
RUDOLPH NAATZ. (L.S.)